Merge branch 'master' into next
Conflicts:
security/keys/internal.h
security/keys/process_keys.c
security/keys/request_key.c
Fixed conflicts above by using the non 'tsk' versions.
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/Documentation/credentials.txt b/Documentation/credentials.txt
new file mode 100644
index 0000000..df03169
--- /dev/null
+++ b/Documentation/credentials.txt
@@ -0,0 +1,582 @@
+ ====================
+ CREDENTIALS IN LINUX
+ ====================
+
+By: David Howells <dhowells@redhat.com>
+
+Contents:
+
+ (*) Overview.
+
+ (*) Types of credentials.
+
+ (*) File markings.
+
+ (*) Task credentials.
+
+ - Immutable credentials.
+ - Accessing task credentials.
+ - Accessing another task's credentials.
+ - Altering credentials.
+ - Managing credentials.
+
+ (*) Open file credentials.
+
+ (*) Overriding the VFS's use of credentials.
+
+
+========
+OVERVIEW
+========
+
+There are several parts to the security check performed by Linux when one
+object acts upon another:
+
+ (1) Objects.
+
+ Objects are things in the system that may be acted upon directly by
+ userspace programs. Linux has a variety of actionable objects, including:
+
+ - Tasks
+ - Files/inodes
+ - Sockets
+ - Message queues
+ - Shared memory segments
+ - Semaphores
+ - Keys
+
+ As a part of the description of all these objects there is a set of
+ credentials. What's in the set depends on the type of object.
+
+ (2) Object ownership.
+
+ Amongst the credentials of most objects, there will be a subset that
+ indicates the ownership of that object. This is used for resource
+ accounting and limitation (disk quotas and task rlimits for example).
+
+ In a standard UNIX filesystem, for instance, this will be defined by the
+ UID marked on the inode.
+
+ (3) The objective context.
+
+ Also amongst the credentials of those objects, there will be a subset that
+ indicates the 'objective context' of that object. This may or may not be
+ the same set as in (2) - in standard UNIX files, for instance, this is the
+ defined by the UID and the GID marked on the inode.
+
+ The objective context is used as part of the security calculation that is
+ carried out when an object is acted upon.
+
+ (4) Subjects.
+
+ A subject is an object that is acting upon another object.
+
+ Most of the objects in the system are inactive: they don't act on other
+ objects within the system. Processes/tasks are the obvious exception:
+ they do stuff; they access and manipulate things.
+
+ Objects other than tasks may under some circumstances also be subjects.
+ For instance an open file may send SIGIO to a task using the UID and EUID
+ given to it by a task that called fcntl(F_SETOWN) upon it. In this case,
+ the file struct will have a subjective context too.
+
+ (5) The subjective context.
+
+ A subject has an additional interpretation of its credentials. A subset
+ of its credentials forms the 'subjective context'. The subjective context
+ is used as part of the security calculation that is carried out when a
+ subject acts.
+
+ A Linux task, for example, has the FSUID, FSGID and the supplementary
+ group list for when it is acting upon a file - which are quite separate
+ from the real UID and GID that normally form the objective context of the
+ task.
+
+ (6) Actions.
+
+ Linux has a number of actions available that a subject may perform upon an
+ object. The set of actions available depends on the nature of the subject
+ and the object.
+
+ Actions include reading, writing, creating and deleting files; forking or
+ signalling and tracing tasks.
+
+ (7) Rules, access control lists and security calculations.
+
+ When a subject acts upon an object, a security calculation is made. This
+ involves taking the subjective context, the objective context and the
+ action, and searching one or more sets of rules to see whether the subject
+ is granted or denied permission to act in the desired manner on the
+ object, given those contexts.
+
+ There are two main sources of rules:
+
+ (a) Discretionary access control (DAC):
+
+ Sometimes the object will include sets of rules as part of its
+ description. This is an 'Access Control List' or 'ACL'. A Linux
+ file may supply more than one ACL.
+
+ A traditional UNIX file, for example, includes a permissions mask that
+ is an abbreviated ACL with three fixed classes of subject ('user',
+ 'group' and 'other'), each of which may be granted certain privileges
+ ('read', 'write' and 'execute' - whatever those map to for the object
+ in question). UNIX file permissions do not allow the arbitrary
+ specification of subjects, however, and so are of limited use.
+
+ A Linux file might also sport a POSIX ACL. This is a list of rules
+ that grants various permissions to arbitrary subjects.
+
+ (b) Mandatory access control (MAC):
+
+ The system as a whole may have one or more sets of rules that get
+ applied to all subjects and objects, regardless of their source.
+ SELinux and Smack are examples of this.
+
+ In the case of SELinux and Smack, each object is given a label as part
+ of its credentials. When an action is requested, they take the
+ subject label, the object label and the action and look for a rule
+ that says that this action is either granted or denied.
+
+
+====================
+TYPES OF CREDENTIALS
+====================
+
+The Linux kernel supports the following types of credentials:
+
+ (1) Traditional UNIX credentials.
+
+ Real User ID
+ Real Group ID
+
+ The UID and GID are carried by most, if not all, Linux objects, even if in
+ some cases it has to be invented (FAT or CIFS files for example, which are
+ derived from Windows). These (mostly) define the objective context of
+ that object, with tasks being slightly different in some cases.
+
+ Effective, Saved and FS User ID
+ Effective, Saved and FS Group ID
+ Supplementary groups
+
+ These are additional credentials used by tasks only. Usually, an
+ EUID/EGID/GROUPS will be used as the subjective context, and real UID/GID
+ will be used as the objective. For tasks, it should be noted that this is
+ not always true.
+
+ (2) Capabilities.
+
+ Set of permitted capabilities
+ Set of inheritable capabilities
+ Set of effective capabilities
+ Capability bounding set
+
+ These are only carried by tasks. They indicate superior capabilities
+ granted piecemeal to a task that an ordinary task wouldn't otherwise have.
+ These are manipulated implicitly by changes to the traditional UNIX
+ credentials, but can also be manipulated directly by the capset() system
+ call.
+
+ The permitted capabilities are those caps that the process might grant
+ itself to its effective or permitted sets through capset(). This
+ inheritable set might also be so constrained.
+
+ The effective capabilities are the ones that a task is actually allowed to
+ make use of itself.
+
+ The inheritable capabilities are the ones that may get passed across
+ execve().
+
+ The bounding set limits the capabilities that may be inherited across
+ execve(), especially when a binary is executed that will execute as UID 0.
+
+ (3) Secure management flags (securebits).
+
+ These are only carried by tasks. These govern the way the above
+ credentials are manipulated and inherited over certain operations such as
+ execve(). They aren't used directly as objective or subjective
+ credentials.
+
+ (4) Keys and keyrings.
+
+ These are only carried by tasks. They carry and cache security tokens
+ that don't fit into the other standard UNIX credentials. They are for
+ making such things as network filesystem keys available to the file
+ accesses performed by processes, without the necessity of ordinary
+ programs having to know about security details involved.
+
+ Keyrings are a special type of key. They carry sets of other keys and can
+ be searched for the desired key. Each process may subscribe to a number
+ of keyrings:
+
+ Per-thread keying
+ Per-process keyring
+ Per-session keyring
+
+ When a process accesses a key, if not already present, it will normally be
+ cached on one of these keyrings for future accesses to find.
+
+ For more information on using keys, see Documentation/keys.txt.
+
+ (5) LSM
+
+ The Linux Security Module allows extra controls to be placed over the
+ operations that a task may do. Currently Linux supports two main
+ alternate LSM options: SELinux and Smack.
+
+ Both work by labelling the objects in a system and then applying sets of
+ rules (policies) that say what operations a task with one label may do to
+ an object with another label.
+
+ (6) AF_KEY
+
+ This is a socket-based approach to credential management for networking
+ stacks [RFC 2367]. It isn't discussed by this document as it doesn't
+ interact directly with task and file credentials; rather it keeps system
+ level credentials.
+
+
+When a file is opened, part of the opening task's subjective context is
+recorded in the file struct created. This allows operations using that file
+struct to use those credentials instead of the subjective context of the task
+that issued the operation. An example of this would be a file opened on a
+network filesystem where the credentials of the opened file should be presented
+to the server, regardless of who is actually doing a read or a write upon it.
+
+
+=============
+FILE MARKINGS
+=============
+
+Files on disk or obtained over the network may have annotations that form the
+objective security context of that file. Depending on the type of filesystem,
+this may include one or more of the following:
+
+ (*) UNIX UID, GID, mode;
+
+ (*) Windows user ID;
+
+ (*) Access control list;
+
+ (*) LSM security label;
+
+ (*) UNIX exec privilege escalation bits (SUID/SGID);
+
+ (*) File capabilities exec privilege escalation bits.
+
+These are compared to the task's subjective security context, and certain
+operations allowed or disallowed as a result. In the case of execve(), the
+privilege escalation bits come into play, and may allow the resulting process
+extra privileges, based on the annotations on the executable file.
+
+
+================
+TASK CREDENTIALS
+================
+
+In Linux, all of a task's credentials are held in (uid, gid) or through
+(groups, keys, LSM security) a refcounted structure of type 'struct cred'.
+Each task points to its credentials by a pointer called 'cred' in its
+task_struct.
+
+Once a set of credentials has been prepared and committed, it may not be
+changed, barring the following exceptions:
+
+ (1) its reference count may be changed;
+
+ (2) the reference count on the group_info struct it points to may be changed;
+
+ (3) the reference count on the security data it points to may be changed;
+
+ (4) the reference count on any keyrings it points to may be changed;
+
+ (5) any keyrings it points to may be revoked, expired or have their security
+ attributes changed; and
+
+ (6) the contents of any keyrings to which it points may be changed (the whole
+ point of keyrings being a shared set of credentials, modifiable by anyone
+ with appropriate access).
+
+To alter anything in the cred struct, the copy-and-replace principle must be
+adhered to. First take a copy, then alter the copy and then use RCU to change
+the task pointer to make it point to the new copy. There are wrappers to aid
+with this (see below).
+
+A task may only alter its _own_ credentials; it is no longer permitted for a
+task to alter another's credentials. This means the capset() system call is no
+longer permitted to take any PID other than the one of the current process.
+Also keyctl_instantiate() and keyctl_negate() functions no longer permit
+attachment to process-specific keyrings in the requesting process as the
+instantiating process may need to create them.
+
+
+IMMUTABLE CREDENTIALS
+---------------------
+
+Once a set of credentials has been made public (by calling commit_creds() for
+example), it must be considered immutable, barring two exceptions:
+
+ (1) The reference count may be altered.
+
+ (2) Whilst the keyring subscriptions of a set of credentials may not be
+ changed, the keyrings subscribed to may have their contents altered.
+
+To catch accidental credential alteration at compile time, struct task_struct
+has _const_ pointers to its credential sets, as does struct file. Furthermore,
+certain functions such as get_cred() and put_cred() operate on const pointers,
+thus rendering casts unnecessary, but require to temporarily ditch the const
+qualification to be able to alter the reference count.
+
+
+ACCESSING TASK CREDENTIALS
+--------------------------
+
+A task being able to alter only its own credentials permits the current process
+to read or replace its own credentials without the need for any form of locking
+- which simplifies things greatly. It can just call:
+
+ const struct cred *current_cred()
+
+to get a pointer to its credentials structure, and it doesn't have to release
+it afterwards.
+
+There are convenience wrappers for retrieving specific aspects of a task's
+credentials (the value is simply returned in each case):
+
+ uid_t current_uid(void) Current's real UID
+ gid_t current_gid(void) Current's real GID
+ uid_t current_euid(void) Current's effective UID
+ gid_t current_egid(void) Current's effective GID
+ uid_t current_fsuid(void) Current's file access UID
+ gid_t current_fsgid(void) Current's file access GID
+ kernel_cap_t current_cap(void) Current's effective capabilities
+ void *current_security(void) Current's LSM security pointer
+ struct user_struct *current_user(void) Current's user account
+
+There are also convenience wrappers for retrieving specific associated pairs of
+a task's credentials:
+
+ void current_uid_gid(uid_t *, gid_t *);
+ void current_euid_egid(uid_t *, gid_t *);
+ void current_fsuid_fsgid(uid_t *, gid_t *);
+
+which return these pairs of values through their arguments after retrieving
+them from the current task's credentials.
+
+
+In addition, there is a function for obtaining a reference on the current
+process's current set of credentials:
+
+ const struct cred *get_current_cred(void);
+
+and functions for getting references to one of the credentials that don't
+actually live in struct cred:
+
+ struct user_struct *get_current_user(void);
+ struct group_info *get_current_groups(void);
+
+which get references to the current process's user accounting structure and
+supplementary groups list respectively.
+
+Once a reference has been obtained, it must be released with put_cred(),
+free_uid() or put_group_info() as appropriate.
+
+
+ACCESSING ANOTHER TASK'S CREDENTIALS
+------------------------------------
+
+Whilst a task may access its own credentials without the need for locking, the
+same is not true of a task wanting to access another task's credentials. It
+must use the RCU read lock and rcu_dereference().
+
+The rcu_dereference() is wrapped by:
+
+ const struct cred *__task_cred(struct task_struct *task);
+
+This should be used inside the RCU read lock, as in the following example:
+
+ void foo(struct task_struct *t, struct foo_data *f)
+ {
+ const struct cred *tcred;
+ ...
+ rcu_read_lock();
+ tcred = __task_cred(t);
+ f->uid = tcred->uid;
+ f->gid = tcred->gid;
+ f->groups = get_group_info(tcred->groups);
+ rcu_read_unlock();
+ ...
+ }
+
+A function need not get RCU read lock to use __task_cred() if it is holding a
+spinlock at the time as this implicitly holds the RCU read lock.
+
+Should it be necessary to hold another task's credentials for a long period of
+time, and possibly to sleep whilst doing so, then the caller should get a
+reference on them using:
+
+ const struct cred *get_task_cred(struct task_struct *task);
+
+This does all the RCU magic inside of it. The caller must call put_cred() on
+the credentials so obtained when they're finished with.
+
+There are a couple of convenience functions to access bits of another task's
+credentials, hiding the RCU magic from the caller:
+
+ uid_t task_uid(task) Task's real UID
+ uid_t task_euid(task) Task's effective UID
+
+If the caller is holding a spinlock or the RCU read lock at the time anyway,
+then:
+
+ __task_cred(task)->uid
+ __task_cred(task)->euid
+
+should be used instead. Similarly, if multiple aspects of a task's credentials
+need to be accessed, RCU read lock or a spinlock should be used, __task_cred()
+called, the result stored in a temporary pointer and then the credential
+aspects called from that before dropping the lock. This prevents the
+potentially expensive RCU magic from being invoked multiple times.
+
+Should some other single aspect of another task's credentials need to be
+accessed, then this can be used:
+
+ task_cred_xxx(task, member)
+
+where 'member' is a non-pointer member of the cred struct. For instance:
+
+ uid_t task_cred_xxx(task, suid);
+
+will retrieve 'struct cred::suid' from the task, doing the appropriate RCU
+magic. This may not be used for pointer members as what they point to may
+disappear the moment the RCU read lock is dropped.
+
+
+ALTERING CREDENTIALS
+--------------------
+
+As previously mentioned, a task may only alter its own credentials, and may not
+alter those of another task. This means that it doesn't need to use any
+locking to alter its own credentials.
+
+To alter the current process's credentials, a function should first prepare a
+new set of credentials by calling:
+
+ struct cred *prepare_creds(void);
+
+this locks current->cred_replace_mutex and then allocates and constructs a
+duplicate of the current process's credentials, returning with the mutex still
+held if successful. It returns NULL if not successful (out of memory).
+
+The mutex prevents ptrace() from altering the ptrace state of a process whilst
+security checks on credentials construction and changing is taking place as
+the ptrace state may alter the outcome, particularly in the case of execve().
+
+The new credentials set should be altered appropriately, and any security
+checks and hooks done. Both the current and the proposed sets of credentials
+are available for this purpose as current_cred() will return the current set
+still at this point.
+
+
+When the credential set is ready, it should be committed to the current process
+by calling:
+
+ int commit_creds(struct cred *new);
+
+This will alter various aspects of the credentials and the process, giving the
+LSM a chance to do likewise, then it will use rcu_assign_pointer() to actually
+commit the new credentials to current->cred, it will release
+current->cred_replace_mutex to allow ptrace() to take place, and it will notify
+the scheduler and others of the changes.
+
+This function is guaranteed to return 0, so that it can be tail-called at the
+end of such functions as sys_setresuid().
+
+Note that this function consumes the caller's reference to the new credentials.
+The caller should _not_ call put_cred() on the new credentials afterwards.
+
+Furthermore, once this function has been called on a new set of credentials,
+those credentials may _not_ be changed further.
+
+
+Should the security checks fail or some other error occur after prepare_creds()
+has been called, then the following function should be invoked:
+
+ void abort_creds(struct cred *new);
+
+This releases the lock on current->cred_replace_mutex that prepare_creds() got
+and then releases the new credentials.
+
+
+A typical credentials alteration function would look something like this:
+
+ int alter_suid(uid_t suid)
+ {
+ struct cred *new;
+ int ret;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ new->suid = suid;
+ ret = security_alter_suid(new);
+ if (ret < 0) {
+ abort_creds(new);
+ return ret;
+ }
+
+ return commit_creds(new);
+ }
+
+
+MANAGING CREDENTIALS
+--------------------
+
+There are some functions to help manage credentials:
+
+ (*) void put_cred(const struct cred *cred);
+
+ This releases a reference to the given set of credentials. If the
+ reference count reaches zero, the credentials will be scheduled for
+ destruction by the RCU system.
+
+ (*) const struct cred *get_cred(const struct cred *cred);
+
+ This gets a reference on a live set of credentials, returning a pointer to
+ that set of credentials.
+
+ (*) struct cred *get_new_cred(struct cred *cred);
+
+ This gets a reference on a set of credentials that is under construction
+ and is thus still mutable, returning a pointer to that set of credentials.
+
+
+=====================
+OPEN FILE CREDENTIALS
+=====================
+
+When a new file is opened, a reference is obtained on the opening task's
+credentials and this is attached to the file struct as 'f_cred' in place of
+'f_uid' and 'f_gid'. Code that used to access file->f_uid and file->f_gid
+should now access file->f_cred->fsuid and file->f_cred->fsgid.
+
+It is safe to access f_cred without the use of RCU or locking because the
+pointer will not change over the lifetime of the file struct, and nor will the
+contents of the cred struct pointed to, barring the exceptions listed above
+(see the Task Credentials section).
+
+
+=======================================
+OVERRIDING THE VFS'S USE OF CREDENTIALS
+=======================================
+
+Under some circumstances it is desirable to override the credentials used by
+the VFS, and that can be done by calling into such as vfs_mkdir() with a
+different set of credentials. This is done in the following places:
+
+ (*) sys_faccessat().
+
+ (*) do_coredump().
+
+ (*) nfs4recover.c.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c600c4f..b3b82f9 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1444,6 +1444,10 @@
instruction doesn't work correctly and not to
use it.
+ no_file_caps Tells the kernel not to honor file capabilities. The
+ only way then for a file to be executed with privilege
+ is to be setuid root or executed by root.
+
nohalt [IA-64] Tells the kernel not to use the power saving
function PAL_HALT_LIGHT when idle. This increases
power-consumption. On the positive side, it reduces
diff --git a/arch/alpha/kernel/asm-offsets.c b/arch/alpha/kernel/asm-offsets.c
index 4b18cd9..6ff8886 100644
--- a/arch/alpha/kernel/asm-offsets.c
+++ b/arch/alpha/kernel/asm-offsets.c
@@ -19,15 +19,18 @@
BLANK();
DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked));
- DEFINE(TASK_UID, offsetof(struct task_struct, uid));
- DEFINE(TASK_EUID, offsetof(struct task_struct, euid));
- DEFINE(TASK_GID, offsetof(struct task_struct, gid));
- DEFINE(TASK_EGID, offsetof(struct task_struct, egid));
+ DEFINE(TASK_CRED, offsetof(struct task_struct, cred));
DEFINE(TASK_REAL_PARENT, offsetof(struct task_struct, real_parent));
DEFINE(TASK_GROUP_LEADER, offsetof(struct task_struct, group_leader));
DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
BLANK();
+ DEFINE(CRED_UID, offsetof(struct cred, uid));
+ DEFINE(CRED_EUID, offsetof(struct cred, euid));
+ DEFINE(CRED_GID, offsetof(struct cred, gid));
+ DEFINE(CRED_EGID, offsetof(struct cred, egid));
+ BLANK();
+
DEFINE(SIZEOF_PT_REGS, sizeof(struct pt_regs));
DEFINE(PT_PTRACED, PT_PTRACED);
DEFINE(CLONE_VM, CLONE_VM);
diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index 5fc61e2..f77345b 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -850,8 +850,9 @@
sys_getxuid:
.prologue 0
ldq $2, TI_TASK($8)
- ldl $0, TASK_UID($2)
- ldl $1, TASK_EUID($2)
+ ldq $3, TASK_CRED($2)
+ ldl $0, CRED_UID($3)
+ ldl $1, CRED_EUID($3)
stq $1, 80($sp)
ret
.end sys_getxuid
@@ -862,8 +863,9 @@
sys_getxgid:
.prologue 0
ldq $2, TI_TASK($8)
- ldl $0, TASK_GID($2)
- ldl $1, TASK_EGID($2)
+ ldq $3, TASK_CRED($2)
+ ldl $0, CRED_GID($3)
+ ldl $1, CRED_EGID($3)
stq $1, 80($sp)
ret
.end sys_getxgid
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index 5e92ae0..16ef61a 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -1767,25 +1767,24 @@
asmlinkage long
sys32_getgroups16 (int gidsetsize, short __user *grouplist)
{
+ const struct cred *cred = current_cred();
int i;
if (gidsetsize < 0)
return -EINVAL;
- get_group_info(current->group_info);
- i = current->group_info->ngroups;
+ i = cred->group_info->ngroups;
if (gidsetsize) {
if (i > gidsetsize) {
i = -EINVAL;
goto out;
}
- if (groups16_to_user(grouplist, current->group_info)) {
+ if (groups16_to_user(grouplist, cred->group_info)) {
i = -EFAULT;
goto out;
}
}
out:
- put_group_info(current->group_info);
return i;
}
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index fab1d21..f94aaa8 100644
--- a/arch/ia64/kernel/mca_drv.c
+++ b/arch/ia64/kernel/mca_drv.c
@@ -158,7 +158,7 @@
ia64_mlogbuf_dump();
printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "
"iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",
- raw_smp_processor_id(), current->pid, current->uid,
+ raw_smp_processor_id(), current->pid, current_uid(),
iip, ipsr, paddr, current->comm);
spin_lock(&mca_bh_lock);
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 6543a55..0e49975 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2220,8 +2220,8 @@
DPRINT(("new inode ino=%ld @%p\n", inode->i_ino, inode));
inode->i_mode = S_IFCHR|S_IRUGO;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
sprintf(name, "[%lu]", inode->i_ino);
this.name = name;
@@ -2399,22 +2399,33 @@
static int
pfm_bad_permissions(struct task_struct *task)
{
+ const struct cred *tcred;
+ uid_t uid = current_uid();
+ gid_t gid = current_gid();
+ int ret;
+
+ rcu_read_lock();
+ tcred = __task_cred(task);
+
/* inspired by ptrace_attach() */
DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
- current->uid,
- current->gid,
- task->euid,
- task->suid,
- task->uid,
- task->egid,
- task->sgid));
+ uid,
+ gid,
+ tcred->euid,
+ tcred->suid,
+ tcred->uid,
+ tcred->egid,
+ tcred->sgid));
- return ((current->uid != task->euid)
- || (current->uid != task->suid)
- || (current->uid != task->uid)
- || (current->gid != task->egid)
- || (current->gid != task->sgid)
- || (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE);
+ ret = ((uid != tcred->euid)
+ || (uid != tcred->suid)
+ || (uid != tcred->uid)
+ || (gid != tcred->egid)
+ || (gid != tcred->sgid)
+ || (gid != tcred->gid)) && !capable(CAP_SYS_PTRACE);
+
+ rcu_read_unlock();
+ return ret;
}
static int
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index e12500a..e1821ca 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -229,7 +229,7 @@
si.si_errno = 0;
si.si_code = SI_KERNEL;
si.si_pid = task_pid_vnr(current);
- si.si_uid = current->uid;
+ si.si_uid = current_uid();
si.si_addr = sc;
force_sig_info(SIGSEGV, &si, current);
return retval;
@@ -326,7 +326,7 @@
si.si_errno = 0;
si.si_code = SI_KERNEL;
si.si_pid = task_pid_vnr(current);
- si.si_uid = current->uid;
+ si.si_uid = current_uid();
si.si_addr = addr;
force_sig_info(SIGSEGV, &si, current);
return 0;
diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c
index b0591ae..fd6e512 100644
--- a/arch/mips/kernel/kspd.c
+++ b/arch/mips/kernel/kspd.c
@@ -174,8 +174,8 @@
static void sp_setfsuidgid( uid_t uid, gid_t gid)
{
- current->fsuid = uid;
- current->fsgid = gid;
+ current->cred->fsuid = uid;
+ current->cred->fsgid = gid;
key_fsuid_changed(current);
key_fsgid_changed(current);
diff --git a/arch/mips/kernel/mips-mt-fpaff.c b/arch/mips/kernel/mips-mt-fpaff.c
index dc9eb72..5e77a3a 100644
--- a/arch/mips/kernel/mips-mt-fpaff.c
+++ b/arch/mips/kernel/mips-mt-fpaff.c
@@ -51,6 +51,7 @@
int retval;
struct task_struct *p;
struct thread_info *ti;
+ uid_t euid;
if (len < sizeof(new_mask))
return -EINVAL;
@@ -76,9 +77,9 @@
*/
get_task_struct(p);
+ euid = current_euid();
retval = -EPERM;
- if ((current->euid != p->euid) && (current->euid != p->uid) &&
- !capable(CAP_SYS_NICE)) {
+ if (euid != p->euid && euid != p->uid && !capable(CAP_SYS_NICE)) {
read_unlock(&tasklist_lock);
goto out_unlock;
}
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 972b2d2..09786e4 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -1085,8 +1085,8 @@
v->load_addr = NULL;
v->len = 0;
- v->uid = filp->f_uid;
- v->gid = filp->f_gid;
+ v->uid = filp->f_cred->fsuid;
+ v->gid = filp->f_cred->fsgid;
#ifdef CONFIG_MIPS_APSP_KSPD
/* get kspd to tell us when a syscall_exit happens */
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 06213d1..f825442 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -182,7 +182,7 @@
si.si_errno = 0;
si.si_code = SI_KERNEL;
si.si_pid = task_pid_vnr(current);
- si.si_uid = current->uid;
+ si.si_uid = current_uid();
si.si_addr = &frame->uc;
force_sig_info(SIGSEGV, &si, current);
return;
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 565b7a2..8660986 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -339,7 +339,7 @@
&& printk_ratelimit())
printk(KERN_CRIT "kernel tried to execute NX-protected"
" page (%lx) - exploit attempt? (uid: %d)\n",
- address, current->uid);
+ address, current_uid());
return SIGSEGV;
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index cb85d23..6296bfd 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -95,8 +95,8 @@
goto out;
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
out:
@@ -323,7 +323,7 @@
goto out;
}
- filp = dentry_open(dentry, mnt, O_RDONLY);
+ filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
if (IS_ERR(filp)) {
put_unused_fd(ret);
ret = PTR_ERR(filp);
@@ -562,7 +562,7 @@
goto out;
}
- filp = dentry_open(dentry, mnt, O_RDONLY);
+ filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
if (IS_ERR(filp)) {
put_unused_fd(ret);
ret = PTR_ERR(filp);
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 3631380..8aadcd7 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -280,8 +280,8 @@
if (!sbi)
return -ENOMEM;
mutex_init(&sbi->lock);
- sbi->uid = current->uid;
- sbi->gid = current->gid;
+ sbi->uid = current_uid();
+ sbi->gid = current_gid();
sb->s_fs_info = sbi;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 4646382..6cc87d8 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -148,9 +148,9 @@
{
int retval;
- if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
- !(retval = put_user(high2lowuid(current->euid), euid)))
- retval = put_user(high2lowuid(current->suid), suid);
+ if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
+ !(retval = put_user(high2lowuid(current->cred->euid), euid)))
+ retval = put_user(high2lowuid(current->cred->suid), suid);
return retval;
}
@@ -165,9 +165,9 @@
{
int retval;
- if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
- !(retval = put_user(high2lowgid(current->egid), egid)))
- retval = put_user(high2lowgid(current->sgid), sgid);
+ if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
+ !(retval = put_user(high2lowgid(current->cred->egid), egid)))
+ retval = put_user(high2lowgid(current->cred->sgid), sgid);
return retval;
}
@@ -217,20 +217,20 @@
if (gidsetsize < 0)
return -EINVAL;
- get_group_info(current->group_info);
- i = current->group_info->ngroups;
+ get_group_info(current->cred->group_info);
+ i = current->cred->group_info->ngroups;
if (gidsetsize) {
if (i > gidsetsize) {
i = -EINVAL;
goto out;
}
- if (groups16_to_user(grouplist, current->group_info)) {
+ if (groups16_to_user(grouplist, current->cred->group_info)) {
i = -EFAULT;
goto out;
}
}
out:
- put_group_info(current->group_info);
+ put_group_info(current->cred->group_info);
return i;
}
@@ -261,22 +261,22 @@
asmlinkage long sys32_getuid16(void)
{
- return high2lowuid(current->uid);
+ return high2lowuid(current->cred->uid);
}
asmlinkage long sys32_geteuid16(void)
{
- return high2lowuid(current->euid);
+ return high2lowuid(current->cred->euid);
}
asmlinkage long sys32_getgid16(void)
{
- return high2lowgid(current->gid);
+ return high2lowgid(current->cred->gid);
}
asmlinkage long sys32_getegid16(void)
{
- return high2lowgid(current->egid);
+ return high2lowgid(current->cred->egid);
}
/*
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 19d579d..16d3b37 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -159,7 +159,8 @@
goto out_kill;
}
- file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
+ file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
+ current_cred());
if (IS_ERR(file)) {
mconsole_reply(req, "Failed to open file", 1, 0);
goto out_kill;
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
index 127ec3f..2a4d073 100644
--- a/arch/x86/ia32/ia32_aout.c
+++ b/arch/x86/ia32/ia32_aout.c
@@ -327,7 +327,7 @@
current->mm->cached_hole_size = 0;
current->mm->mmap = NULL;
- compute_creds(bprm);
+ install_exec_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
if (N_MAGIC(ex) == OMAGIC) {
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 31e8730..3a1b6ef 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -393,7 +393,7 @@
if (pte && pte_present(*pte) && !pte_exec(*pte))
printk(KERN_CRIT "kernel tried to execute "
"NX-protected page - exploit attempt? "
- "(uid: %d)\n", current->uid);
+ "(uid: %d)\n", current_uid());
}
#endif
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 5c4ee70..fb06ed6 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -936,8 +936,10 @@
{
int err;
struct loop_func_table *xfer;
+ uid_t uid = current_uid();
- if (lo->lo_encrypt_key_size && lo->lo_key_owner != current->uid &&
+ if (lo->lo_encrypt_key_size &&
+ lo->lo_key_owner != uid &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
if (lo->lo_state != Lo_bound)
@@ -992,7 +994,7 @@
if (info->lo_encrypt_key_size) {
memcpy(lo->lo_encrypt_key, info->lo_encrypt_key,
info->lo_encrypt_key_size);
- lo->lo_key_owner = current->uid;
+ lo->lo_key_owner = uid;
}
return 0;
diff --git a/drivers/char/tty_audit.c b/drivers/char/tty_audit.c
index 5787249..d961fa9 100644
--- a/drivers/char/tty_audit.c
+++ b/drivers/char/tty_audit.c
@@ -86,10 +86,12 @@
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY);
if (ab) {
char name[sizeof(tsk->comm)];
+ uid_t uid = task_uid(tsk);
audit_log_format(ab, "tty pid=%u uid=%u auid=%u ses=%u "
- "major=%d minor=%d comm=", tsk->pid, tsk->uid,
- loginuid, sessionid, buf->major, buf->minor);
+ "major=%d minor=%d comm=",
+ tsk->pid, uid, loginuid, sessionid,
+ buf->major, buf->minor);
get_task_comm(name, tsk);
audit_log_untrustedstring(ab, name);
audit_log_format(ab, " data=");
diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 5c9f67f..c5afc98 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -106,6 +106,7 @@
struct proc_event *ev;
__u8 buffer[CN_PROC_MSG_SIZE];
struct timespec ts;
+ const struct cred *cred;
if (atomic_read(&proc_event_num_listeners) < 1)
return;
@@ -115,14 +116,19 @@
ev->what = which_id;
ev->event_data.id.process_pid = task->pid;
ev->event_data.id.process_tgid = task->tgid;
+ rcu_read_lock();
+ cred = __task_cred(task);
if (which_id == PROC_EVENT_UID) {
- ev->event_data.id.r.ruid = task->uid;
- ev->event_data.id.e.euid = task->euid;
+ ev->event_data.id.r.ruid = cred->uid;
+ ev->event_data.id.e.euid = cred->euid;
} else if (which_id == PROC_EVENT_GID) {
- ev->event_data.id.r.rgid = task->gid;
- ev->event_data.id.e.egid = task->egid;
- } else
+ ev->event_data.id.r.rgid = cred->gid;
+ ev->event_data.id.e.egid = cred->egid;
+ } else {
+ rcu_read_unlock();
return;
+ }
+ rcu_read_unlock();
get_seq(&msg->seq, &ev->cpu);
ktime_get_ts(&ts); /* get high res monotonic timestamp */
put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
diff --git a/drivers/isdn/capi/capifs.c b/drivers/isdn/capi/capifs.c
index 550e80f..0aa66ec 100644
--- a/drivers/isdn/capi/capifs.c
+++ b/drivers/isdn/capi/capifs.c
@@ -156,8 +156,8 @@
if (!inode)
return;
inode->i_ino = number+2;
- inode->i_uid = config.setuid ? config.uid : current->fsuid;
- inode->i_gid = config.setgid ? config.gid : current->fsgid;
+ inode->i_uid = config.setuid ? config.uid : current_fsuid();
+ inode->i_gid = config.setgid ? config.gid : current_fsgid();
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
init_special_inode(inode, S_IFCHR|config.mode, device);
//inode->i_op = &capifs_file_inode_operations;
diff --git a/drivers/isdn/hysdn/hysdn_procconf.c b/drivers/isdn/hysdn/hysdn_procconf.c
index 484299b..8f9f491 100644
--- a/drivers/isdn/hysdn/hysdn_procconf.c
+++ b/drivers/isdn/hysdn/hysdn_procconf.c
@@ -246,7 +246,8 @@
}
if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
- filep->f_uid, filep->f_gid, filep->f_mode);
+ filep->f_cred->fsuid, filep->f_cred->fsgid,
+ filep->f_mode);
if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
/* write only access -> write boot file or conf line */
@@ -331,7 +332,8 @@
}
if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
- filep->f_uid, filep->f_gid, filep->f_mode);
+ filep->f_cred->fsuid, filep->f_cred->fsgid,
+ filep->f_mode);
if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
/* write only access -> write boot file or conf line */
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 33b6d1b..55dc70c 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -702,6 +702,7 @@
struct tun_net *tn;
struct tun_struct *tun;
struct net_device *dev;
+ const struct cred *cred = current_cred();
int err;
tn = net_generic(net, tun_net_id);
@@ -712,11 +713,12 @@
/* Check permissions */
if (((tun->owner != -1 &&
- current->euid != tun->owner) ||
+ cred->euid != tun->owner) ||
(tun->group != -1 &&
- current->egid != tun->group)) &&
- !capable(CAP_NET_ADMIN))
+ cred->egid != tun->group)) &&
+ !capable(CAP_NET_ADMIN)) {
return -EPERM;
+ }
}
else if (__dev_get_by_name(net, ifr->ifr_name))
return -EINVAL;
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 2bccefe..aa79280 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -574,6 +574,7 @@
{
struct usb_device *dev = NULL;
struct dev_state *ps;
+ const struct cred *cred = current_cred();
int ret;
lock_kernel();
@@ -617,8 +618,8 @@
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disc_pid = get_pid(task_pid(current));
- ps->disc_uid = current->uid;
- ps->disc_euid = current->euid;
+ ps->disc_uid = cred->uid;
+ ps->disc_euid = cred->euid;
ps->disccontext = NULL;
ps->ifclaimed = 0;
security_task_getsecid(current, &ps->secid);
@@ -967,6 +968,7 @@
struct usb_host_endpoint *ep;
struct async *as;
struct usb_ctrlrequest *dr = NULL;
+ const struct cred *cred = current_cred();
unsigned int u, totlen, isofrmlen;
int ret, ifnum = -1;
int is_in;
@@ -1174,8 +1176,8 @@
as->signr = uurb->signr;
as->ifnum = ifnum;
as->pid = get_pid(task_pid(current));
- as->uid = current->uid;
- as->euid = current->euid;
+ as->uid = cred->uid;
+ as->euid = cred->euid;
security_task_getsecid(current, &as->secid);
if (!is_in) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 9463226..185be76 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -277,8 +277,8 @@
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 3031e32..a43e4ab 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -120,7 +120,7 @@
switch (access) {
case V9FS_ACCESS_SINGLE:
case V9FS_ACCESS_USER:
- uid = current->fsuid;
+ uid = current_fsuid();
any = 0;
break;
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 8314d3f..8fddfe8 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -215,8 +215,8 @@
inode = new_inode(sb);
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_rdev = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index d6cb1a0..93212e4 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -113,8 +113,8 @@
struct v9fs_session_info *v9ses = NULL;
struct p9_wstat *st = NULL;
int mode = S_IRWXUGO | S_ISVTX;
- uid_t uid = current->fsuid;
- gid_t gid = current->fsgid;
+ uid_t uid = current_fsuid();
+ gid_t gid = current_fsgid();
struct p9_fid *fid;
int retval = 0;
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index a13b334..415d9c6 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -293,8 +293,8 @@
mark_buffer_dirty_inode(bh, inode);
affs_brelse(bh);
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_ino = block;
inode->i_nlink = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 8989c93..a19d64b 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -163,8 +163,8 @@
/* Fill in defaults */
- *uid = current->uid;
- *gid = current->gid;
+ *uid = current_uid();
+ *gid = current_gid();
*reserved = 2;
*root = -1;
*blocksize = -1;
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 3662dd4..c16d9be 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -154,8 +154,8 @@
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IRUSR | S_IWUSR;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
}
diff --git a/fs/attr.c b/fs/attr.c
index 7a83819..f436019 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -29,13 +29,13 @@
/* Make sure a caller can chown. */
if ((ia_valid & ATTR_UID) &&
- (current->fsuid != inode->i_uid ||
+ (current_fsuid() != inode->i_uid ||
attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
goto error;
/* Make sure caller can chgrp. */
if ((ia_valid & ATTR_GID) &&
- (current->fsuid != inode->i_uid ||
+ (current_fsuid() != inode->i_uid ||
(!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
!capable(CAP_CHOWN))
goto error;
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index b70eea1..c773680 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -76,8 +76,8 @@
substring_t args[MAX_OPT_ARGS];
int option;
- *uid = current->uid;
- *gid = current->gid;
+ *uid = current_uid();
+ *gid = current_gid();
*pgrp = task_pgrp_nr(current);
*minproto = *maxproto = AUTOFS_PROTO_VERSION;
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 33bf8cb..63b7c7a 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -308,7 +308,8 @@
goto out;
}
- filp = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
+ filp = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
+ current_cred());
if (IS_ERR(filp)) {
err = PTR_ERR(filp);
goto out;
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index c7e65bb..7b19802 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -235,8 +235,8 @@
substring_t args[MAX_OPT_ARGS];
int option;
- *uid = current->uid;
- *gid = current->gid;
+ *uid = current_uid();
+ *gid = current_gid();
*pgrp = task_pgrp_nr(current);
*minproto = AUTOFS_MIN_PROTO_VERSION;
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 4b67c2a..e02cc8a 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -391,8 +391,8 @@
memcpy(&wq->name, &qstr, sizeof(struct qstr));
wq->dev = autofs4_get_dev(sbi);
wq->ino = autofs4_get_ino(sbi);
- wq->uid = current->uid;
- wq->gid = current->gid;
+ wq->uid = current_uid();
+ wq->gid = current_gid();
wq->pid = current->pid;
wq->tgid = current->tgid;
wq->status = -EINTR; /* Status return if interrupted */
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
index daae463..4dd1b62 100644
--- a/fs/bfs/dir.c
+++ b/fs/bfs/dir.c
@@ -106,8 +106,8 @@
}
set_bit(ino, info->si_imap);
info->si_freei--;
- inode->i_uid = current->fsuid;
- inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current_fsgid();
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
inode->i_blocks = 0;
inode->i_op = &bfs_file_inops;
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index 204cfd1..f1f3f41 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -320,7 +320,7 @@
current->mm->free_area_cache = current->mm->mmap_base;
current->mm->cached_hole_size = 0;
- compute_creds(bprm);
+ install_exec_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
#ifdef __sparc__
if (N_MAGIC(ex) == NMAGIC) {
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 8fcfa39..f458c12 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -157,7 +157,7 @@
int items;
elf_addr_t *elf_info;
int ei_index = 0;
- struct task_struct *tsk = current;
+ const struct cred *cred = current_cred();
struct vm_area_struct *vma;
/*
@@ -223,10 +223,10 @@
NEW_AUX_ENT(AT_BASE, interp_load_addr);
NEW_AUX_ENT(AT_FLAGS, 0);
NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
- NEW_AUX_ENT(AT_UID, tsk->uid);
- NEW_AUX_ENT(AT_EUID, tsk->euid);
- NEW_AUX_ENT(AT_GID, tsk->gid);
- NEW_AUX_ENT(AT_EGID, tsk->egid);
+ NEW_AUX_ENT(AT_UID, cred->uid);
+ NEW_AUX_ENT(AT_EUID, cred->euid);
+ NEW_AUX_ENT(AT_GID, cred->gid);
+ NEW_AUX_ENT(AT_EGID, cred->egid);
NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
NEW_AUX_ENT(AT_EXECFN, bprm->exec);
if (k_platform) {
@@ -956,7 +956,7 @@
}
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
- compute_creds(bprm);
+ install_exec_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
retval = create_elf_tables(bprm, &loc->elf_ex,
load_addr, interp_load_addr);
@@ -1361,6 +1361,7 @@
static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct mm_struct *mm)
{
+ const struct cred *cred;
unsigned int i, len;
/* first copy the parameters from user space */
@@ -1388,8 +1389,11 @@
psinfo->pr_zomb = psinfo->pr_sname == 'Z';
psinfo->pr_nice = task_nice(p);
psinfo->pr_flag = p->flags;
- SET_UID(psinfo->pr_uid, p->uid);
- SET_GID(psinfo->pr_gid, p->gid);
+ rcu_read_lock();
+ cred = __task_cred(p);
+ SET_UID(psinfo->pr_uid, cred->uid);
+ SET_GID(psinfo->pr_gid, cred->gid);
+ rcu_read_unlock();
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
return 0;
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 5b5424c..aa5b432 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -404,7 +404,7 @@
current->mm->start_stack = current->mm->start_brk + stack_size;
#endif
- compute_creds(bprm);
+ install_exec_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
if (create_elf_fdpic_tables(bprm, current->mm,
&exec_params, &interp_params) < 0)
@@ -475,6 +475,7 @@
struct elf_fdpic_params *exec_params,
struct elf_fdpic_params *interp_params)
{
+ const struct cred *cred = current_cred();
unsigned long sp, csp, nitems;
elf_caddr_t __user *argv, *envp;
size_t platform_len = 0, len;
@@ -623,10 +624,10 @@
NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr);
NEW_AUX_ENT(AT_FLAGS, 0);
NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr);
- NEW_AUX_ENT(AT_UID, (elf_addr_t) current->uid);
- NEW_AUX_ENT(AT_EUID, (elf_addr_t) current->euid);
- NEW_AUX_ENT(AT_GID, (elf_addr_t) current->gid);
- NEW_AUX_ENT(AT_EGID, (elf_addr_t) current->egid);
+ NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid);
+ NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid);
+ NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid);
+ NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid);
NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
NEW_AUX_ENT(AT_EXECFN, bprm->exec);
@@ -1413,6 +1414,7 @@
static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct mm_struct *mm)
{
+ const struct cred *cred;
unsigned int i, len;
/* first copy the parameters from user space */
@@ -1440,8 +1442,11 @@
psinfo->pr_zomb = psinfo->pr_sname == 'Z';
psinfo->pr_nice = task_nice(p);
psinfo->pr_flag = p->flags;
- SET_UID(psinfo->pr_uid, p->uid);
- SET_GID(psinfo->pr_gid, p->gid);
+ rcu_read_lock();
+ cred = __task_cred(p);
+ SET_UID(psinfo->pr_uid, cred->uid);
+ SET_GID(psinfo->pr_gid, cred->gid);
+ rcu_read_unlock();
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
return 0;
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index ccb781a..7bbd5c6 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -880,7 +880,7 @@
(libinfo.lib_list[j].loaded)?
libinfo.lib_list[j].start_data:UNLOADED_LIB;
- compute_creds(bprm);
+ install_exec_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
set_binfmt(&flat_format);
diff --git a/fs/binfmt_som.c b/fs/binfmt_som.c
index 74e587a..08644a6 100644
--- a/fs/binfmt_som.c
+++ b/fs/binfmt_som.c
@@ -255,7 +255,7 @@
kfree(hpuxhdr);
set_binfmt(&som_format);
- compute_creds(bprm);
+ install_exec_creds(bprm);
setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
create_som_tables(bprm);
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 877c854..1e7b874 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -19,7 +19,7 @@
#define _CIFS_FS_SB_H
#define CIFS_MOUNT_NO_PERM 1 /* do not do client vfs_perm check */
-#define CIFS_MOUNT_SET_UID 2 /* set current->euid in create etc. */
+#define CIFS_MOUNT_SET_UID 2 /* set current's euid in create etc. */
#define CIFS_MOUNT_SERVER_INUM 4 /* inode numbers from uniqueid from server */
#define CIFS_MOUNT_DIRECT_IO 8 /* do not write nor read through page cache */
#define CIFS_MOUNT_NO_XATTR 0x10 /* if set - disable xattr support */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 6f21ecb..9d8b978 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -39,7 +39,7 @@
unsigned int /* length */ , struct sockaddr *, bool);
extern unsigned int _GetXid(void);
extern void _FreeXid(unsigned int);
-#define GetXid() (int)_GetXid(); cFYI(1,("CIFS VFS: in %s as Xid: %d with uid: %d",__func__, xid,current->fsuid));
+#define GetXid() (int)_GetXid(); cFYI(1,("CIFS VFS: in %s as Xid: %d with uid: %d",__func__, xid,current_fsuid()));
#define FreeXid(curr_xid) {_FreeXid(curr_xid); cFYI(1,("CIFS VFS: leaving %s (xid = %d) rc = %d",__func__,curr_xid,(int)rc));}
extern char *build_path_from_dentry(struct dentry *);
extern char *build_wildcard_path_from_dentry(struct dentry *direntry);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index e9f9248..e5dca9a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -833,8 +833,8 @@
/* null target name indicates to use *SMBSERVR default called name
if we end up sending RFC1001 session initialize */
vol->target_rfc1001_name[0] = 0;
- vol->linux_uid = current->uid; /* current->euid instead? */
- vol->linux_gid = current->gid;
+ vol->linux_uid = current_uid(); /* use current_euid() instead? */
+ vol->linux_gid = current_gid();
vol->dir_mode = S_IRWXUGO;
/* 2767 perms indicate mandatory locking support */
vol->file_mode = (S_IRWXUGO | S_ISGID) & (~S_IXGRP);
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index e962e75..2f02c52 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -235,11 +235,11 @@
};
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- args.uid = (__u64) current->fsuid;
+ args.uid = (__u64) current_fsuid();
if (inode->i_mode & S_ISGID)
args.gid = (__u64) inode->i_gid;
else
- args.gid = (__u64) current->fsgid;
+ args.gid = (__u64) current_fsgid();
} else {
args.uid = NO_CHANGE_64;
args.gid = NO_CHANGE_64;
@@ -271,13 +271,13 @@
if ((oplock & CIFS_CREATE_ACTION) &&
(cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_SET_UID)) {
- newinode->i_uid = current->fsuid;
+ newinode->i_uid = current_fsuid();
if (inode->i_mode & S_ISGID)
newinode->i_gid =
inode->i_gid;
else
newinode->i_gid =
- current->fsgid;
+ current_fsgid();
}
}
}
@@ -375,8 +375,8 @@
.device = device_number,
};
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- args.uid = (__u64) current->fsuid;
- args.gid = (__u64) current->fsgid;
+ args.uid = (__u64) current_fsuid();
+ args.gid = (__u64) current_fsgid();
} else {
args.uid = NO_CHANGE_64;
args.gid = NO_CHANGE_64;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index ff8c68d..8b7305e 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1143,11 +1143,11 @@
.device = 0,
};
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- args.uid = (__u64)current->fsuid;
+ args.uid = (__u64)current_fsuid();
if (inode->i_mode & S_ISGID)
args.gid = (__u64)inode->i_gid;
else
- args.gid = (__u64)current->fsgid;
+ args.gid = (__u64)current_fsgid();
} else {
args.uid = NO_CHANGE_64;
args.gid = NO_CHANGE_64;
@@ -1184,13 +1184,13 @@
if (cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_SET_UID) {
direntry->d_inode->i_uid =
- current->fsuid;
+ current_fsuid();
if (inode->i_mode & S_ISGID)
direntry->d_inode->i_gid =
inode->i_gid;
else
direntry->d_inode->i_gid =
- current->fsgid;
+ current_fsgid();
}
}
}
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 0088a5b..f946506 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -65,7 +65,7 @@
switch (command) {
case CIFS_IOC_CHECKUMOUNT:
cFYI(1, ("User unmount attempted"));
- if (cifs_sb->mnt_uid == current->uid)
+ if (cifs_sb->mnt_uid == current_uid())
rc = 0;
else {
rc = -EACCES;
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 88786ba..ec36410 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -347,13 +347,13 @@
/* BB Add support for establishing new tCon and SMB Session */
/* with userid/password pairs found on the smb session */
/* for other target tcp/ip addresses BB */
- if (current->fsuid != treeCon->ses->linux_uid) {
+ if (current_fsuid() != treeCon->ses->linux_uid) {
cFYI(1, ("Multiuser mode and UID "
"did not match tcon uid"));
read_lock(&GlobalSMBSeslock);
list_for_each(temp_item, &GlobalSMBSessionList) {
ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);
- if (ses->linux_uid == current->fsuid) {
+ if (ses->linux_uid == current_fsuid()) {
if (ses->server == treeCon->ses->server) {
cFYI(1, ("found matching uid substitute right smb_uid"));
buffer->Uid = ses->Suid;
diff --git a/fs/coda/cache.c b/fs/coda/cache.c
index 8a23703..a5bf577 100644
--- a/fs/coda/cache.c
+++ b/fs/coda/cache.c
@@ -32,8 +32,8 @@
struct coda_inode_info *cii = ITOC(inode);
cii->c_cached_epoch = atomic_read(&permission_epoch);
- if (cii->c_uid != current->fsuid) {
- cii->c_uid = current->fsuid;
+ if (cii->c_uid != current_fsuid()) {
+ cii->c_uid = current_fsuid();
cii->c_cached_perm = mask;
} else
cii->c_cached_perm |= mask;
@@ -60,7 +60,7 @@
int hit;
hit = (mask & cii->c_cached_perm) == mask &&
- cii->c_uid == current->fsuid &&
+ cii->c_uid == current_fsuid() &&
cii->c_cached_epoch == atomic_read(&permission_epoch);
return hit;
diff --git a/fs/coda/file.c b/fs/coda/file.c
index 29137ff..5a87699 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -174,7 +174,7 @@
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
- coda_flags, coda_file->f_uid);
+ coda_flags, coda_file->f_cred->fsuid);
host_inode = cfi->cfi_container->f_path.dentry->d_inode;
cii = ITOC(coda_inode);
diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
index ce432bc..c274d94 100644
--- a/fs/coda/upcall.c
+++ b/fs/coda/upcall.c
@@ -52,7 +52,7 @@
inp->ih.opcode = opcode;
inp->ih.pid = current->pid;
inp->ih.pgid = task_pgrp_nr(current);
- inp->ih.uid = current->fsuid;
+ inp->ih.uid = current_fsuid();
return (void*)inp;
}
diff --git a/fs/compat.c b/fs/compat.c
index e5f49f5..d1ece79 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1393,10 +1393,20 @@
if (!bprm)
goto out_ret;
+ retval = mutex_lock_interruptible(¤t->cred_exec_mutex);
+ if (retval < 0)
+ goto out_free;
+
+ retval = -ENOMEM;
+ bprm->cred = prepare_exec_creds();
+ if (!bprm->cred)
+ goto out_unlock;
+ check_unsafe_exec(bprm);
+
file = open_exec(filename);
retval = PTR_ERR(file);
if (IS_ERR(file))
- goto out_kfree;
+ goto out_unlock;
sched_exec();
@@ -1410,14 +1420,10 @@
bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
if ((retval = bprm->argc) < 0)
- goto out_mm;
+ goto out;
bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
if ((retval = bprm->envc) < 0)
- goto out_mm;
-
- retval = security_bprm_alloc(bprm);
- if (retval)
goto out;
retval = prepare_binprm(bprm);
@@ -1438,19 +1444,16 @@
goto out;
retval = search_binary_handler(bprm, regs);
- if (retval >= 0) {
- /* execve success */
- security_bprm_free(bprm);
- acct_update_integrals(current);
- free_bprm(bprm);
- return retval;
- }
+ if (retval < 0)
+ goto out;
+
+ /* execve succeeded */
+ mutex_unlock(¤t->cred_exec_mutex);
+ acct_update_integrals(current);
+ free_bprm(bprm);
+ return retval;
out:
- if (bprm->security)
- security_bprm_free(bprm);
-
-out_mm:
if (bprm->mm)
mmput(bprm->mm);
@@ -1460,7 +1463,10 @@
fput(bprm->file);
}
-out_kfree:
+out_unlock:
+ mutex_unlock(¤t->cred_exec_mutex);
+
+out_free:
free_bprm(bprm);
out_ret:
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 4a714f6c..5d61b7c 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -222,8 +222,8 @@
return -ENOMEM;
inode->i_ino = number+2;
- inode->i_uid = config.setuid ? config.uid : current->fsuid;
- inode->i_gid = config.setgid ? config.gid : current->fsgid;
+ inode->i_uid = config.setuid ? config.uid : current_fsuid();
+ inode->i_gid = config.setgid ? config.gid : current_fsgid();
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
init_special_inode(inode, S_IFCHR|config.mode, device);
inode->i_private = tty;
diff --git a/fs/dquot.c b/fs/dquot.c
index 5e95261..c237ccc 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -874,7 +874,7 @@
switch (dquot->dq_type) {
case USRQUOTA:
- return current->fsuid == dquot->dq_id;
+ return current_fsuid() == dquot->dq_id;
case GRPQUOTA:
return in_group_p(dquot->dq_id);
}
@@ -981,7 +981,7 @@
MINOR(dquot->dq_sb->s_dev));
if (ret)
goto attr_err_out;
- ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current->user->uid);
+ ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
if (ret)
goto attr_err_out;
genlmsg_end(skb, msg_head);
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 3504cf9..a75026d 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -691,7 +691,8 @@
void ecryptfs_destroy_kthread(void);
int ecryptfs_privileged_open(struct file **lower_file,
struct dentry *lower_dentry,
- struct vfsmount *lower_mnt);
+ struct vfsmount *lower_mnt,
+ const struct cred *cred);
int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
#endif /* #ifndef ECRYPTFS_KERNEL_H */
diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c
index c440c6b..c6d7a4d 100644
--- a/fs/ecryptfs/kthread.c
+++ b/fs/ecryptfs/kthread.c
@@ -73,7 +73,7 @@
mntget(req->lower_mnt);
(*req->lower_file) = dentry_open(
req->lower_dentry, req->lower_mnt,
- (O_RDWR | O_LARGEFILE));
+ (O_RDWR | O_LARGEFILE), current_cred());
req->flags |= ECRYPTFS_REQ_PROCESSED;
}
wake_up(&req->wait);
@@ -132,7 +132,8 @@
*/
int ecryptfs_privileged_open(struct file **lower_file,
struct dentry *lower_dentry,
- struct vfsmount *lower_mnt)
+ struct vfsmount *lower_mnt,
+ const struct cred *cred)
{
struct ecryptfs_open_req *req;
int rc = 0;
@@ -143,7 +144,7 @@
dget(lower_dentry);
mntget(lower_mnt);
(*lower_file) = dentry_open(lower_dentry, lower_mnt,
- (O_RDWR | O_LARGEFILE));
+ (O_RDWR | O_LARGEFILE), cred);
if (!IS_ERR(*lower_file))
goto out;
req = kmem_cache_alloc(ecryptfs_open_req_cache, GFP_KERNEL);
@@ -184,7 +185,7 @@
dget(lower_dentry);
mntget(lower_mnt);
(*lower_file) = dentry_open(lower_dentry, lower_mnt,
- (O_RDONLY | O_LARGEFILE));
+ (O_RDONLY | O_LARGEFILE), cred);
if (IS_ERR(*lower_file)) {
rc = PTR_ERR(*req->lower_file);
(*lower_file) = NULL;
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 64d2ba9..fd63071 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -115,6 +115,7 @@
*/
int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
{
+ const struct cred *cred = current_cred();
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
int rc = 0;
@@ -127,7 +128,7 @@
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
rc = ecryptfs_privileged_open(&inode_info->lower_file,
- lower_dentry, lower_mnt);
+ lower_dentry, lower_mnt, cred);
if (rc || IS_ERR(inode_info->lower_file)) {
printk(KERN_ERR "Error opening lower persistent file "
"for lower_dentry [0x%p] and lower_mnt [0x%p]; "
diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
index c698397..e0b0a4e 100644
--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -361,6 +361,7 @@
size_t msg_size;
struct nsproxy *nsproxy;
struct user_namespace *current_user_ns;
+ uid_t ctx_euid;
int rc;
if (msg->index >= ecryptfs_message_buf_len) {
@@ -385,8 +386,8 @@
goto wake_up;
}
current_user_ns = nsproxy->user_ns;
- rc = ecryptfs_find_daemon_by_euid(&daemon, msg_ctx->task->euid,
- current_user_ns);
+ ctx_euid = task_euid(msg_ctx->task);
+ rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, current_user_ns);
rcu_read_unlock();
mutex_unlock(&ecryptfs_daemon_hash_mux);
if (rc) {
@@ -394,14 +395,14 @@
printk(KERN_WARNING "%s: User [%d] received a "
"message response from process [0x%p] but does "
"not have a registered daemon\n", __func__,
- msg_ctx->task->euid, pid);
+ ctx_euid, pid);
goto wake_up;
}
- if (msg_ctx->task->euid != euid) {
+ if (ctx_euid != euid) {
rc = -EBADMSG;
printk(KERN_WARNING "%s: Received message from user "
"[%d]; expected message from user [%d]\n", __func__,
- euid, msg_ctx->task->euid);
+ euid, ctx_euid);
goto unlock;
}
if (current_user_ns != user_ns) {
@@ -415,7 +416,7 @@
rc = -EBADMSG;
printk(KERN_ERR "%s: User [%d] sent a message response "
"from an unrecognized process [0x%p]\n",
- __func__, msg_ctx->task->euid, pid);
+ __func__, ctx_euid, pid);
goto unlock;
}
if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
@@ -464,14 +465,15 @@
struct ecryptfs_msg_ctx **msg_ctx)
{
struct ecryptfs_daemon *daemon;
+ uid_t euid = current_euid();
int rc;
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
if (rc || !daemon) {
rc = -ENOTCONN;
printk(KERN_ERR "%s: User [%d] does not have a daemon "
- "registered\n", __func__, current->euid);
+ "registered\n", __func__, euid);
goto out;
}
mutex_lock(&ecryptfs_msg_ctx_lists_mux);
diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index b484792..047ac60 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -42,11 +42,12 @@
{
struct ecryptfs_daemon *daemon;
unsigned int mask = 0;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
/* TODO: Just use file->private_data? */
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
BUG_ON(rc || !daemon);
mutex_lock(&daemon->mux);
@@ -83,6 +84,7 @@
ecryptfs_miscdev_open(struct inode *inode, struct file *file)
{
struct ecryptfs_daemon *daemon = NULL;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
@@ -93,10 +95,10 @@
"count; rc = [%d]\n", __func__, rc);
goto out_unlock_daemon_list;
}
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
if (rc || !daemon) {
- rc = ecryptfs_spawn_daemon(&daemon, current->euid,
+ rc = ecryptfs_spawn_daemon(&daemon, euid,
current->nsproxy->user_ns,
task_pid(current));
if (rc) {
@@ -147,10 +149,11 @@
ecryptfs_miscdev_release(struct inode *inode, struct file *file)
{
struct ecryptfs_daemon *daemon = NULL;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
BUG_ON(rc || !daemon);
mutex_lock(&daemon->mux);
@@ -246,11 +249,12 @@
char packet_length[3];
size_t i;
size_t total_length;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
/* TODO: Just use file->private_data? */
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
BUG_ON(rc || !daemon);
mutex_lock(&daemon->mux);
@@ -290,7 +294,7 @@
* message from the queue; try again */
goto check_list;
}
- BUG_ON(current->euid != daemon->euid);
+ BUG_ON(euid != daemon->euid);
BUG_ON(current->nsproxy->user_ns != daemon->user_ns);
BUG_ON(task_pid(current) != daemon->pid);
msg_ctx = list_first_entry(&daemon->msg_ctx_out_queue,
@@ -414,6 +418,7 @@
size_t packet_size, packet_size_length, i;
ssize_t sz = 0;
char *data;
+ uid_t euid = current_euid();
int rc;
if (count == 0)
@@ -463,8 +468,7 @@
goto out_free;
}
rc = ecryptfs_miscdev_response(&data[i], packet_size,
- current->euid,
- current->nsproxy->user_ns,
+ euid, current->nsproxy->user_ns,
task_pid(current), seq);
if (rc)
printk(KERN_WARNING "%s: Failed to deliver miscdev "
diff --git a/fs/exec.c b/fs/exec.c
index 4e834f1..32f13e2 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -55,6 +55,7 @@
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
+#include "internal.h"
#ifdef __alpha__
/* for /sbin/loader handling in search_binary_handler() */
@@ -980,7 +981,7 @@
/* This is the point of no return */
current->sas_ss_sp = current->sas_ss_size = 0;
- if (current->euid == current->uid && current->egid == current->gid)
+ if (current_euid() == current_uid() && current_egid() == current_gid())
set_dumpable(current->mm, 1);
else
set_dumpable(current->mm, suid_dumpable);
@@ -1007,16 +1008,17 @@
*/
current->mm->task_size = TASK_SIZE;
- if (bprm->e_uid != current->euid || bprm->e_gid != current->egid) {
- suid_keys(current);
- set_dumpable(current->mm, suid_dumpable);
+ /* install the new credentials */
+ if (bprm->cred->uid != current_euid() ||
+ bprm->cred->gid != current_egid()) {
current->pdeath_signal = 0;
} else if (file_permission(bprm->file, MAY_READ) ||
- (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)) {
- suid_keys(current);
+ bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP) {
set_dumpable(current->mm, suid_dumpable);
}
+ current->personality &= ~bprm->per_clear;
+
/* An exec changes our domain. We are no longer part of the thread
group */
@@ -1033,13 +1035,50 @@
EXPORT_SYMBOL(flush_old_exec);
+/*
+ * install the new credentials for this executable
+ */
+void install_exec_creds(struct linux_binprm *bprm)
+{
+ security_bprm_committing_creds(bprm);
+
+ commit_creds(bprm->cred);
+ bprm->cred = NULL;
+
+ /* cred_exec_mutex must be held at least to this point to prevent
+ * ptrace_attach() from altering our determination of the task's
+ * credentials; any time after this it may be unlocked */
+
+ security_bprm_committed_creds(bprm);
+}
+EXPORT_SYMBOL(install_exec_creds);
+
+/*
+ * determine how safe it is to execute the proposed program
+ * - the caller must hold current->cred_exec_mutex to protect against
+ * PTRACE_ATTACH
+ */
+void check_unsafe_exec(struct linux_binprm *bprm)
+{
+ struct task_struct *p = current;
+
+ bprm->unsafe = tracehook_unsafe_exec(p);
+
+ if (atomic_read(&p->fs->count) > 1 ||
+ atomic_read(&p->files->count) > 1 ||
+ atomic_read(&p->sighand->count) > 1)
+ bprm->unsafe |= LSM_UNSAFE_SHARE;
+}
+
/*
* Fill the binprm structure from the inode.
* Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes
+ *
+ * This may be called multiple times for binary chains (scripts for example).
*/
int prepare_binprm(struct linux_binprm *bprm)
{
- int mode;
+ umode_t mode;
struct inode * inode = bprm->file->f_path.dentry->d_inode;
int retval;
@@ -1047,14 +1086,15 @@
if (bprm->file->f_op == NULL)
return -EACCES;
- bprm->e_uid = current->euid;
- bprm->e_gid = current->egid;
+ /* clear any previous set[ug]id data from a previous binary */
+ bprm->cred->euid = current_euid();
+ bprm->cred->egid = current_egid();
- if(!(bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)) {
+ if (!(bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)) {
/* Set-uid? */
if (mode & S_ISUID) {
- current->personality &= ~PER_CLEAR_ON_SETID;
- bprm->e_uid = inode->i_uid;
+ bprm->per_clear |= PER_CLEAR_ON_SETID;
+ bprm->cred->euid = inode->i_uid;
}
/* Set-gid? */
@@ -1064,52 +1104,23 @@
* executable.
*/
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
- current->personality &= ~PER_CLEAR_ON_SETID;
- bprm->e_gid = inode->i_gid;
+ bprm->per_clear |= PER_CLEAR_ON_SETID;
+ bprm->cred->egid = inode->i_gid;
}
}
/* fill in binprm security blob */
- retval = security_bprm_set(bprm);
+ retval = security_bprm_set_creds(bprm);
if (retval)
return retval;
+ bprm->cred_prepared = 1;
- memset(bprm->buf,0,BINPRM_BUF_SIZE);
- return kernel_read(bprm->file,0,bprm->buf,BINPRM_BUF_SIZE);
+ memset(bprm->buf, 0, BINPRM_BUF_SIZE);
+ return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
}
EXPORT_SYMBOL(prepare_binprm);
-static int unsafe_exec(struct task_struct *p)
-{
- int unsafe = tracehook_unsafe_exec(p);
-
- if (atomic_read(&p->fs->count) > 1 ||
- atomic_read(&p->files->count) > 1 ||
- atomic_read(&p->sighand->count) > 1)
- unsafe |= LSM_UNSAFE_SHARE;
-
- return unsafe;
-}
-
-void compute_creds(struct linux_binprm *bprm)
-{
- int unsafe;
-
- if (bprm->e_uid != current->uid) {
- suid_keys(current);
- current->pdeath_signal = 0;
- }
- exec_keys(current);
-
- task_lock(current);
- unsafe = unsafe_exec(current);
- security_bprm_apply_creds(bprm, unsafe);
- task_unlock(current);
- security_bprm_post_apply_creds(bprm);
-}
-EXPORT_SYMBOL(compute_creds);
-
/*
* Arguments are '\0' separated strings found at the location bprm->p
* points to; chop off the first by relocating brpm->p to right after
@@ -1262,6 +1273,8 @@
void free_bprm(struct linux_binprm *bprm)
{
free_arg_pages(bprm);
+ if (bprm->cred)
+ abort_creds(bprm->cred);
kfree(bprm);
}
@@ -1287,10 +1300,20 @@
if (!bprm)
goto out_files;
+ retval = mutex_lock_interruptible(¤t->cred_exec_mutex);
+ if (retval < 0)
+ goto out_free;
+
+ retval = -ENOMEM;
+ bprm->cred = prepare_exec_creds();
+ if (!bprm->cred)
+ goto out_unlock;
+ check_unsafe_exec(bprm);
+
file = open_exec(filename);
retval = PTR_ERR(file);
if (IS_ERR(file))
- goto out_kfree;
+ goto out_unlock;
sched_exec();
@@ -1304,14 +1327,10 @@
bprm->argc = count(argv, MAX_ARG_STRINGS);
if ((retval = bprm->argc) < 0)
- goto out_mm;
+ goto out;
bprm->envc = count(envp, MAX_ARG_STRINGS);
if ((retval = bprm->envc) < 0)
- goto out_mm;
-
- retval = security_bprm_alloc(bprm);
- if (retval)
goto out;
retval = prepare_binprm(bprm);
@@ -1333,21 +1352,18 @@
current->flags &= ~PF_KTHREAD;
retval = search_binary_handler(bprm,regs);
- if (retval >= 0) {
- /* execve success */
- security_bprm_free(bprm);
- acct_update_integrals(current);
- free_bprm(bprm);
- if (displaced)
- put_files_struct(displaced);
- return retval;
- }
+ if (retval < 0)
+ goto out;
+
+ /* execve succeeded */
+ mutex_unlock(¤t->cred_exec_mutex);
+ acct_update_integrals(current);
+ free_bprm(bprm);
+ if (displaced)
+ put_files_struct(displaced);
+ return retval;
out:
- if (bprm->security)
- security_bprm_free(bprm);
-
-out_mm:
if (bprm->mm)
mmput (bprm->mm);
@@ -1356,7 +1372,11 @@
allow_write_access(bprm->file);
fput(bprm->file);
}
-out_kfree:
+
+out_unlock:
+ mutex_unlock(¤t->cred_exec_mutex);
+
+out_free:
free_bprm(bprm);
out_files:
@@ -1388,6 +1408,7 @@
*/
static int format_corename(char *corename, long signr)
{
+ const struct cred *cred = current_cred();
const char *pat_ptr = core_pattern;
int ispipe = (*pat_ptr == '|');
char *out_ptr = corename;
@@ -1424,7 +1445,7 @@
/* uid */
case 'u':
rc = snprintf(out_ptr, out_end - out_ptr,
- "%d", current->uid);
+ "%d", cred->uid);
if (rc > out_end - out_ptr)
goto out;
out_ptr += rc;
@@ -1432,7 +1453,7 @@
/* gid */
case 'g':
rc = snprintf(out_ptr, out_end - out_ptr,
- "%d", current->gid);
+ "%d", cred->gid);
if (rc > out_end - out_ptr)
goto out;
out_ptr += rc;
@@ -1708,8 +1729,9 @@
struct linux_binfmt * binfmt;
struct inode * inode;
struct file * file;
+ const struct cred *old_cred;
+ struct cred *cred;
int retval = 0;
- int fsuid = current->fsuid;
int flag = 0;
int ispipe = 0;
unsigned long core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
@@ -1722,12 +1744,20 @@
binfmt = current->binfmt;
if (!binfmt || !binfmt->core_dump)
goto fail;
+
+ cred = prepare_creds();
+ if (!cred) {
+ retval = -ENOMEM;
+ goto fail;
+ }
+
down_write(&mm->mmap_sem);
/*
* If another thread got here first, or we are not dumpable, bail out.
*/
if (mm->core_state || !get_dumpable(mm)) {
up_write(&mm->mmap_sem);
+ put_cred(cred);
goto fail;
}
@@ -1738,12 +1768,16 @@
*/
if (get_dumpable(mm) == 2) { /* Setuid core dump mode */
flag = O_EXCL; /* Stop rewrite attacks */
- current->fsuid = 0; /* Dump root private */
+ cred->fsuid = 0; /* Dump root private */
}
retval = coredump_wait(exit_code, &core_state);
- if (retval < 0)
+ if (retval < 0) {
+ put_cred(cred);
goto fail;
+ }
+
+ old_cred = override_creds(cred);
/*
* Clear any false indication of pending signals that might
@@ -1815,7 +1849,7 @@
* Dont allow local users get cute and trick others to coredump
* into their pre-created files:
*/
- if (inode->i_uid != current->fsuid)
+ if (inode->i_uid != current_fsuid())
goto close_fail;
if (!file->f_op)
goto close_fail;
@@ -1834,7 +1868,8 @@
if (helper_argv)
argv_free(helper_argv);
- current->fsuid = fsuid;
+ revert_creds(old_cred);
+ put_cred(cred);
coredump_finish(mm);
fail:
return retval;
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 80246ba..ec1fb91 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.h>
+#include <linux/sched.h>
#define dprintk(fmt, args...) do{}while(0)
@@ -249,6 +250,7 @@
static int get_name(struct vfsmount *mnt, struct dentry *dentry,
char *name, struct dentry *child)
{
+ const struct cred *cred = current_cred();
struct inode *dir = dentry->d_inode;
int error;
struct file *file;
@@ -263,7 +265,7 @@
/*
* Open the directory ...
*/
- file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY);
+ file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY, cred);
error = PTR_ERR(file);
if (IS_ERR(file))
goto out;
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 6dac7ba..4a29d63 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1193,7 +1193,7 @@
free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count);
if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
- sbi->s_resuid != current->fsuid &&
+ sbi->s_resuid != current_fsuid() &&
(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
return 0;
}
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index f597413..8d0add6 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -550,7 +550,7 @@
sb->s_dirt = 1;
mark_buffer_dirty(bh2);
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (test_opt (sb, GRPID))
inode->i_gid = dir->i_gid;
else if (dir->i_mode & S_ISGID) {
@@ -558,7 +558,7 @@
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
inode->i_mode = mode;
inode->i_ino = ino;
diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index f5b57a2..0dbf1c0 100644
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -1422,7 +1422,7 @@
free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count);
if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
- sbi->s_resuid != current->fsuid &&
+ sbi->s_resuid != current_fsuid() &&
(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
return 0;
}
diff --git a/fs/ext3/ialloc.c b/fs/ext3/ialloc.c
index 47b678d..490bd0e 100644
--- a/fs/ext3/ialloc.c
+++ b/fs/ext3/ialloc.c
@@ -539,7 +539,7 @@
percpu_counter_inc(&sbi->s_dirs_counter);
sb->s_dirt = 1;
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (test_opt (sb, GRPID))
inode->i_gid = dir->i_gid;
else if (dir->i_mode & S_ISGID) {
@@ -547,7 +547,7 @@
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
inode->i_mode = mode;
inode->i_ino = ino;
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index d2003cd..a932b9a 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -624,7 +624,7 @@
return 1;
/* Hm, nope. Are (enough) root reserved blocks available? */
- if (sbi->s_resuid == current->fsuid ||
+ if (sbi->s_resuid == current_fsuid() ||
((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
capable(CAP_SYS_RESOURCE)) {
if (free_blocks >= (nblocks + dirty_blocks))
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 2a117e2..08cac9f 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -787,7 +787,7 @@
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (test_opt(sb, GRPID))
inode->i_gid = dir->i_gid;
else if (dir->i_mode & S_ISGID) {
@@ -795,7 +795,7 @@
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
inode->i_mode = mode;
inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
diff --git a/fs/fat/file.c b/fs/fat/file.c
index f06a4e5..0a7f4a9 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -304,7 +304,7 @@
{
mode_t allow_utime = sbi->options.allow_utime;
- if (current->fsuid != inode->i_uid) {
+ if (current_fsuid() != inode->i_uid) {
if (in_group_p(inode->i_gid))
allow_utime >>= 3;
if (allow_utime & MAY_WRITE)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index bdd8fb7..d937aaf 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -926,8 +926,8 @@
opts->isvfat = is_vfat;
- opts->fs_uid = current->uid;
- opts->fs_gid = current->gid;
+ opts->fs_uid = current_uid();
+ opts->fs_gid = current_gid();
opts->fs_fmask = opts->fs_dmask = current->fs->umask;
opts->allow_utime = -1;
opts->codepage = fat_default_codepage;
diff --git a/fs/fcntl.c b/fs/fcntl.c
index ac4f7db..87c39f1 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -205,13 +205,14 @@
int __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
int force)
{
+ const struct cred *cred = current_cred();
int err;
err = security_file_set_fowner(filp);
if (err)
return err;
- f_modown(filp, pid, type, current->uid, current->euid, force);
+ f_modown(filp, pid, type, cred->uid, cred->euid, force);
return 0;
}
EXPORT_SYMBOL(__f_setown);
@@ -400,10 +401,17 @@
static inline int sigio_perm(struct task_struct *p,
struct fown_struct *fown, int sig)
{
- return (((fown->euid == 0) ||
- (fown->euid == p->suid) || (fown->euid == p->uid) ||
- (fown->uid == p->suid) || (fown->uid == p->uid)) &&
- !security_file_send_sigiotask(p, fown, sig));
+ const struct cred *cred;
+ int ret;
+
+ rcu_read_lock();
+ cred = __task_cred(p);
+ ret = ((fown->euid == 0 ||
+ fown->euid == cred->suid || fown->euid == cred->uid ||
+ fown->uid == cred->suid || fown->uid == cred->uid) &&
+ !security_file_send_sigiotask(p, fown, sig));
+ rcu_read_unlock();
+ return ret;
}
static void send_sigio_to_task(struct task_struct *p,
diff --git a/fs/file_table.c b/fs/file_table.c
index 5ad0eca..0fbcacc 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -36,7 +36,9 @@
static inline void file_free_rcu(struct rcu_head *head)
{
- struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
+ struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
+
+ put_cred(f->f_cred);
kmem_cache_free(filp_cachep, f);
}
@@ -94,7 +96,7 @@
*/
struct file *get_empty_filp(void)
{
- struct task_struct *tsk;
+ const struct cred *cred = current_cred();
static int old_max;
struct file * f;
@@ -118,12 +120,10 @@
if (security_file_alloc(f))
goto fail_sec;
- tsk = current;
INIT_LIST_HEAD(&f->f_u.fu_list);
atomic_long_set(&f->f_count, 1);
rwlock_init(&f->f_owner.lock);
- f->f_uid = tsk->fsuid;
- f->f_gid = tsk->fsgid;
+ f->f_cred = get_cred(cred);
eventpoll_init_file(f);
/* f->f_version: 0 */
return f;
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index b723614..fba5716 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -87,8 +87,8 @@
static void fuse_req_init_context(struct fuse_req *req)
{
- req->in.h.uid = current->fsuid;
- req->in.h.gid = current->fsgid;
+ req->in.h.uid = current_fsuid();
+ req->in.h.gid = current_fsgid();
req->in.h.pid = current->pid;
}
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index fd03330..95bc22b 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -869,18 +869,25 @@
*/
int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
{
+ const struct cred *cred;
+ int ret;
+
if (fc->flags & FUSE_ALLOW_OTHER)
return 1;
- if (task->euid == fc->user_id &&
- task->suid == fc->user_id &&
- task->uid == fc->user_id &&
- task->egid == fc->group_id &&
- task->sgid == fc->group_id &&
- task->gid == fc->group_id)
- return 1;
+ rcu_read_lock();
+ ret = 0;
+ cred = __task_cred(task);
+ if (cred->euid == fc->user_id &&
+ cred->suid == fc->user_id &&
+ cred->uid == fc->user_id &&
+ cred->egid == fc->group_id &&
+ cred->sgid == fc->group_id &&
+ cred->gid == fc->group_id)
+ ret = 1;
+ rcu_read_unlock();
- return 0;
+ return ret;
}
static int fuse_access(struct inode *inode, int mask)
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 7cee695..d576168 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -705,18 +705,18 @@
(dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
if (S_ISDIR(*mode))
*mode |= S_ISUID;
- else if (dip->i_inode.i_uid != current->fsuid)
+ else if (dip->i_inode.i_uid != current_fsuid())
*mode &= ~07111;
*uid = dip->i_inode.i_uid;
} else
- *uid = current->fsuid;
+ *uid = current_fsuid();
if (dip->i_inode.i_mode & S_ISGID) {
if (S_ISDIR(*mode))
*mode |= S_ISGID;
*gid = dip->i_inode.i_gid;
} else
- *gid = current->fsgid;
+ *gid = current_fsgid();
}
static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
@@ -1124,8 +1124,8 @@
return -EPERM;
if ((dip->i_inode.i_mode & S_ISVTX) &&
- dip->i_inode.i_uid != current->fsuid &&
- ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
+ dip->i_inode.i_uid != current_fsuid() &&
+ ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
return -EPERM;
if (IS_APPEND(&dip->i_inode))
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index c69b7ac..9435dda 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -155,8 +155,8 @@
hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
inode->i_ino = HFS_SB(sb)->next_id++;
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_nlink = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
HFS_I(inode)->flags = 0;
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index 3c7c763..c8b5acf 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -210,8 +210,8 @@
int tmp, token;
/* initialize the sb with defaults */
- hsb->s_uid = current->uid;
- hsb->s_gid = current->gid;
+ hsb->s_uid = current_uid();
+ hsb->s_gid = current_gid();
hsb->s_file_umask = 0133;
hsb->s_dir_umask = 0022;
hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index b207f0e..f105ee9 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -296,8 +296,8 @@
inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_nlink = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
index 9699c56..bab7f8d 100644
--- a/fs/hfsplus/options.c
+++ b/fs/hfsplus/options.c
@@ -49,8 +49,8 @@
opts->creator = HFSPLUS_DEF_CR_TYPE;
opts->type = HFSPLUS_DEF_CR_TYPE;
opts->umask = current->fs->umask;
- opts->uid = current->uid;
- opts->gid = current->gid;
+ opts->uid = current_uid();
+ opts->gid = current_gid();
opts->part = -1;
opts->session = -1;
}
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index 10783f3..b649232 100644
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -92,11 +92,11 @@
inc_nlink(dir);
insert_inode_hash(result);
- if (result->i_uid != current->fsuid ||
- result->i_gid != current->fsgid ||
+ if (result->i_uid != current_fsuid() ||
+ result->i_gid != current_fsgid() ||
result->i_mode != (mode | S_IFDIR)) {
- result->i_uid = current->fsuid;
- result->i_gid = current->fsgid;
+ result->i_uid = current_fsuid();
+ result->i_gid = current_fsgid();
result->i_mode = mode | S_IFDIR;
hpfs_write_inode_nolock(result);
}
@@ -184,11 +184,11 @@
insert_inode_hash(result);
- if (result->i_uid != current->fsuid ||
- result->i_gid != current->fsgid ||
+ if (result->i_uid != current_fsuid() ||
+ result->i_gid != current_fsgid() ||
result->i_mode != (mode | S_IFREG)) {
- result->i_uid = current->fsuid;
- result->i_gid = current->fsgid;
+ result->i_uid = current_fsuid();
+ result->i_gid = current_fsgid();
result->i_mode = mode | S_IFREG;
hpfs_write_inode_nolock(result);
}
@@ -247,8 +247,8 @@
result->i_mtime.tv_nsec = 0;
result->i_atime.tv_nsec = 0;
hpfs_i(result)->i_ea_size = 0;
- result->i_uid = current->fsuid;
- result->i_gid = current->fsgid;
+ result->i_uid = current_fsuid();
+ result->i_gid = current_fsgid();
result->i_nlink = 1;
result->i_size = 0;
result->i_blocks = 1;
@@ -325,8 +325,8 @@
result->i_atime.tv_nsec = 0;
hpfs_i(result)->i_ea_size = 0;
result->i_mode = S_IFLNK | 0777;
- result->i_uid = current->fsuid;
- result->i_gid = current->fsgid;
+ result->i_uid = current_fsuid();
+ result->i_gid = current_fsgid();
result->i_blocks = 1;
result->i_nlink = 1;
result->i_size = strlen(symlink);
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 29ad461..0d049b8 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -475,8 +475,8 @@
init_MUTEX(&sbi->hpfs_creation_de);
- uid = current->uid;
- gid = current->gid;
+ uid = current_uid();
+ gid = current_gid();
umask = current->fs->umask;
lowercase = 0;
conv = CONV_BINARY;
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index 2b3d182..b278f7f 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -426,6 +426,7 @@
static int hppfs_open(struct inode *inode, struct file *file)
{
+ const struct cred *cred = file->f_cred;
struct hppfs_private *data;
struct vfsmount *proc_mnt;
struct dentry *proc_dentry;
@@ -446,7 +447,7 @@
/* XXX This isn't closed anywhere */
data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
- file_mode(file->f_mode));
+ file_mode(file->f_mode), cred);
err = PTR_ERR(data->proc_file);
if (IS_ERR(data->proc_file))
goto out_free1;
@@ -489,6 +490,7 @@
static int hppfs_dir_open(struct inode *inode, struct file *file)
{
+ const struct cred *cred = file->f_cred;
struct hppfs_private *data;
struct vfsmount *proc_mnt;
struct dentry *proc_dentry;
@@ -502,7 +504,7 @@
proc_dentry = HPPFS_I(inode)->proc_dentry;
proc_mnt = inode->i_sb->s_fs_info;
data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
- file_mode(file->f_mode));
+ file_mode(file->f_mode), cred);
err = PTR_ERR(data->proc_file);
if (IS_ERR(data->proc_file))
goto out_free;
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 61edc70..7d479ce 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -551,9 +551,9 @@
if (S_ISDIR(mode))
mode |= S_ISGID;
} else {
- gid = current->fsgid;
+ gid = current_fsgid();
}
- inode = hugetlbfs_get_inode(dir->i_sb, current->fsuid, gid, mode, dev);
+ inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev);
if (inode) {
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
d_instantiate(dentry, inode);
@@ -586,9 +586,9 @@
if (dir->i_mode & S_ISGID)
gid = dir->i_gid;
else
- gid = current->fsgid;
+ gid = current_fsgid();
- inode = hugetlbfs_get_inode(dir->i_sb, current->fsuid,
+ inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(),
gid, S_IFLNK|S_IRWXUGO, 0);
if (inode) {
int l = strlen(symname)+1;
@@ -854,8 +854,8 @@
config.nr_blocks = -1; /* No limit on size by default */
config.nr_inodes = -1; /* No limit on number of inodes by default */
- config.uid = current->fsuid;
- config.gid = current->fsgid;
+ config.uid = current_fsuid();
+ config.gid = current_fsgid();
config.mode = 0755;
config.hstate = &default_hstate;
ret = hugetlbfs_parse_options(data, &config);
@@ -951,6 +951,7 @@
struct inode *inode;
struct dentry *dentry, *root;
struct qstr quick_string;
+ struct user_struct *user = current_user();
if (!hugetlbfs_vfsmount)
return ERR_PTR(-ENOENT);
@@ -958,7 +959,7 @@
if (!can_do_hugetlb_shm())
return ERR_PTR(-EPERM);
- if (!user_shm_lock(size, current->user))
+ if (!user_shm_lock(size, user))
return ERR_PTR(-ENOMEM);
root = hugetlbfs_vfsmount->mnt_root;
@@ -970,8 +971,8 @@
goto out_shm_unlock;
error = -ENOSPC;
- inode = hugetlbfs_get_inode(root->d_sb, current->fsuid,
- current->fsgid, S_IFREG | S_IRWXUGO, 0);
+ inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(),
+ current_fsgid(), S_IFREG | S_IRWXUGO, 0);
if (!inode)
goto out_dentry;
@@ -998,7 +999,7 @@
out_dentry:
dput(dentry);
out_shm_unlock:
- user_shm_unlock(size, current->user);
+ user_shm_unlock(size, user);
return ERR_PTR(error);
}
diff --git a/fs/inotify_user.c b/fs/inotify_user.c
index d367e9b..e2425bb 100644
--- a/fs/inotify_user.c
+++ b/fs/inotify_user.c
@@ -601,7 +601,7 @@
goto out_put_fd;
}
- user = get_uid(current->user);
+ user = get_current_user();
if (unlikely(atomic_read(&user->inotify_devs) >=
inotify_max_user_instances)) {
ret = -EMFILE;
diff --git a/fs/internal.h b/fs/internal.h
index 80aa9a0..53af885 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -10,6 +10,7 @@
*/
struct super_block;
+struct linux_binprm;
/*
* block_dev.c
@@ -40,6 +41,11 @@
extern void __init chrdev_init(void);
/*
+ * exec.c
+ */
+extern void check_unsafe_exec(struct linux_binprm *);
+
+/*
* namespace.c
*/
extern int copy_mount_options(const void __user *, unsigned long *);
diff --git a/fs/ioprio.c b/fs/ioprio.c
index da3cc46..3569e0a 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -31,10 +31,16 @@
{
int err;
struct io_context *ioc;
+ const struct cred *cred = current_cred(), *tcred;
- if (task->uid != current->euid &&
- task->uid != current->uid && !capable(CAP_SYS_NICE))
+ rcu_read_lock();
+ tcred = __task_cred(task);
+ if (tcred->uid != cred->euid &&
+ tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
+ rcu_read_unlock();
return -EPERM;
+ }
+ rcu_read_unlock();
err = security_task_setioprio(task, ioprio);
if (err)
@@ -123,7 +129,7 @@
break;
case IOPRIO_WHO_USER:
if (!who)
- user = current->user;
+ user = current_user();
else
user = find_user(who);
@@ -131,7 +137,7 @@
break;
do_each_thread(g, p) {
- if (p->uid != who)
+ if (__task_cred(p)->uid != who)
continue;
ret = set_task_ioprio(p, ioprio);
if (ret)
@@ -216,7 +222,7 @@
break;
case IOPRIO_WHO_USER:
if (!who)
- user = current->user;
+ user = current_user();
else
user = find_user(who);
@@ -224,7 +230,7 @@
break;
do_each_thread(g, p) {
- if (p->uid != user->uid)
+ if (__task_cred(p)->uid != user->uid)
continue;
tmpio = get_task_ioprio(p);
if (tmpio < 0)
diff --git a/fs/jfs/jfs_inode.c b/fs/jfs/jfs_inode.c
index ed6574b..70022fd 100644
--- a/fs/jfs/jfs_inode.c
+++ b/fs/jfs/jfs_inode.c
@@ -93,13 +93,13 @@
return ERR_PTR(rc);
}
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (parent->i_mode & S_ISGID) {
inode->i_gid = parent->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
/*
* New inodes need to save sane values on disk when
diff --git a/fs/locks.c b/fs/locks.c
index 09062e3..46a2e12 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1349,7 +1349,7 @@
struct inode *inode = dentry->d_inode;
int error, rdlease_count = 0, wrlease_count = 0;
- if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
+ if ((current_fsuid() != inode->i_uid) && !capable(CAP_LEASE))
return -EACCES;
if (!S_ISREG(inode->i_mode))
return -EINVAL;
diff --git a/fs/minix/bitmap.c b/fs/minix/bitmap.c
index 703cc35..3aebe32 100644
--- a/fs/minix/bitmap.c
+++ b/fs/minix/bitmap.c
@@ -262,8 +262,8 @@
iput(inode);
return NULL;
}
- inode->i_uid = current->fsuid;
- inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current_fsgid();
inode->i_ino = j;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
inode->i_blocks = 0;
diff --git a/fs/namei.c b/fs/namei.c
index 09ce58e..42d7b76 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -186,7 +186,7 @@
mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
- if (current->fsuid == inode->i_uid)
+ if (current_fsuid() == inode->i_uid)
mode >>= 6;
else {
if (IS_POSIXACL(inode) && (mode & S_IRWXG) && check_acl) {
@@ -441,7 +441,7 @@
if (inode->i_op && inode->i_op->permission)
return -EAGAIN;
- if (current->fsuid == inode->i_uid)
+ if (current_fsuid() == inode->i_uid)
mode >>= 6;
else if (in_group_p(inode->i_gid))
mode >>= 3;
@@ -1334,11 +1334,13 @@
*/
static inline int check_sticky(struct inode *dir, struct inode *inode)
{
+ uid_t fsuid = current_fsuid();
+
if (!(dir->i_mode & S_ISVTX))
return 0;
- if (inode->i_uid == current->fsuid)
+ if (inode->i_uid == fsuid)
return 0;
- if (dir->i_uid == current->fsuid)
+ if (dir->i_uid == fsuid)
return 0;
return !capable(CAP_FOWNER);
}
diff --git a/fs/namespace.c b/fs/namespace.c
index 65b3dc8..1c09cab 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1176,7 +1176,7 @@
if (S_ISLNK(path->dentry->d_inode->i_mode))
return -EPERM;
if (path->dentry->d_inode->i_mode & S_ISVTX) {
- if (current->uid != path->dentry->d_inode->i_uid)
+ if (current_uid() != path->dentry->d_inode->i_uid)
return -EPERM;
}
if (inode_permission(path->dentry->d_inode, MAY_WRITE))
diff --git a/fs/ncpfs/ioctl.c b/fs/ncpfs/ioctl.c
index 3a97c95..6d04e05 100644
--- a/fs/ncpfs/ioctl.c
+++ b/fs/ncpfs/ioctl.c
@@ -40,10 +40,10 @@
struct inode *inode = file->f_path.dentry->d_inode;
struct ncp_fs_info info;
- if ((file_permission(file, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(file, MAY_WRITE) != 0
+ && current_uid() != server->m.mounted_uid)
return -EACCES;
- }
+
if (copy_from_user(&info, arg, sizeof(info)))
return -EFAULT;
@@ -70,10 +70,10 @@
struct inode *inode = file->f_path.dentry->d_inode;
struct ncp_fs_info_v2 info2;
- if ((file_permission(file, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(file, MAY_WRITE) != 0
+ && current_uid() != server->m.mounted_uid)
return -EACCES;
- }
+
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;
@@ -141,10 +141,10 @@
struct inode *inode = file->f_path.dentry->d_inode;
struct compat_ncp_fs_info_v2 info2;
- if ((file_permission(file, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(file, MAY_WRITE) != 0
+ && current_uid() != server->m.mounted_uid)
return -EACCES;
- }
+
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;
@@ -270,16 +270,17 @@
struct ncp_ioctl_request request;
char* bouncebuffer;
void __user *argp = (void __user *)arg;
+ uid_t uid = current_uid();
switch (cmd) {
#ifdef CONFIG_COMPAT
case NCP_IOC_NCPREQUEST_32:
#endif
case NCP_IOC_NCPREQUEST:
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
#ifdef CONFIG_COMPAT
if (cmd == NCP_IOC_NCPREQUEST_32) {
struct compat_ncp_ioctl_request request32;
@@ -356,10 +357,10 @@
case NCP_IOC_GETMOUNTUID16:
case NCP_IOC_GETMOUNTUID32:
case NCP_IOC_GETMOUNTUID64:
- if ((file_permission(filp, MAY_READ) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(filp, MAY_READ) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
if (cmd == NCP_IOC_GETMOUNTUID16) {
u16 uid;
SET_UID(uid, server->m.mounted_uid);
@@ -380,11 +381,10 @@
{
struct ncp_setroot_ioctl sr;
- if ((file_permission(filp, MAY_READ) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_READ) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
if (server->m.mounted_vol[0]) {
struct dentry* dentry = inode->i_sb->s_root;
@@ -408,6 +408,7 @@
return -EFAULT;
return 0;
}
+
case NCP_IOC_SETROOT:
{
struct ncp_setroot_ioctl sr;
@@ -455,11 +456,10 @@
#ifdef CONFIG_NCPFS_PACKET_SIGNING
case NCP_IOC_SIGN_INIT:
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
if (argp) {
if (server->sign_wanted)
{
@@ -478,24 +478,22 @@
return 0;
case NCP_IOC_SIGN_WANTED:
- if ((file_permission(filp, MAY_READ) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_READ) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
if (put_user(server->sign_wanted, (int __user *)argp))
return -EFAULT;
return 0;
+
case NCP_IOC_SET_SIGN_WANTED:
{
int newstate;
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
/* get only low 8 bits... */
if (get_user(newstate, (unsigned char __user *)argp))
return -EFAULT;
@@ -512,11 +510,10 @@
#ifdef CONFIG_NCPFS_IOCTL_LOCKING
case NCP_IOC_LOCKUNLOCK:
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
{
struct ncp_lock_ioctl rqdata;
@@ -585,9 +582,8 @@
#ifdef CONFIG_COMPAT
case NCP_IOC_GETOBJECTNAME_32:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct compat_ncp_objectname_ioctl user;
size_t outl;
@@ -609,10 +605,10 @@
return 0;
}
#endif
+
case NCP_IOC_GETOBJECTNAME:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_objectname_ioctl user;
size_t outl;
@@ -633,13 +629,13 @@
return -EFAULT;
return 0;
}
+
#ifdef CONFIG_COMPAT
case NCP_IOC_SETOBJECTNAME_32:
#endif
case NCP_IOC_SETOBJECTNAME:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_objectname_ioctl user;
void* newname;
@@ -691,13 +687,13 @@
kfree(oldname);
return 0;
}
+
#ifdef CONFIG_COMPAT
case NCP_IOC_GETPRIVATEDATA_32:
#endif
case NCP_IOC_GETPRIVATEDATA:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_privatedata_ioctl user;
size_t outl;
@@ -736,13 +732,13 @@
return 0;
}
+
#ifdef CONFIG_COMPAT
case NCP_IOC_SETPRIVATEDATA_32:
#endif
case NCP_IOC_SETPRIVATEDATA:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_privatedata_ioctl user;
void* new;
@@ -794,9 +790,10 @@
#endif /* CONFIG_NCPFS_NLS */
case NCP_IOC_SETDENTRYTTL:
- if ((file_permission(filp, MAY_WRITE) != 0) &&
- (current->uid != server->m.mounted_uid))
+ if (file_permission(filp, MAY_WRITE) != 0 &&
+ uid != server->m.mounted_uid)
return -EACCES;
+
{
u_int32_t user;
diff --git a/fs/nfsctl.c b/fs/nfsctl.c
index aed8145..cc4ef26 100644
--- a/fs/nfsctl.c
+++ b/fs/nfsctl.c
@@ -41,7 +41,8 @@
error = may_open(&nd, MAY_WRITE, FMODE_WRITE);
if (!error)
- return dentry_open(nd.path.dentry, nd.path.mnt, flags);
+ return dentry_open(nd.path.dentry, nd.path.mnt, flags,
+ current_cred());
path_put(&nd.path);
return ERR_PTR(error);
diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 294992e..0184fe9 100644
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -27,53 +27,70 @@
int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
{
- struct svc_cred cred = rqstp->rq_cred;
+ struct group_info *rqgi;
+ struct group_info *gi;
+ struct cred *new;
int i;
int flags = nfsexp_flags(rqstp, exp);
int ret;
- if (flags & NFSEXP_ALLSQUASH) {
- cred.cr_uid = exp->ex_anon_uid;
- cred.cr_gid = exp->ex_anon_gid;
- cred.cr_group_info = groups_alloc(0);
- } else if (flags & NFSEXP_ROOTSQUASH) {
- struct group_info *gi;
- if (!cred.cr_uid)
- cred.cr_uid = exp->ex_anon_uid;
- if (!cred.cr_gid)
- cred.cr_gid = exp->ex_anon_gid;
- gi = groups_alloc(cred.cr_group_info->ngroups);
- if (gi)
- for (i = 0; i < cred.cr_group_info->ngroups; i++) {
- if (!GROUP_AT(cred.cr_group_info, i))
- GROUP_AT(gi, i) = exp->ex_anon_gid;
- else
- GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
- }
- cred.cr_group_info = gi;
- } else
- get_group_info(cred.cr_group_info);
-
- if (cred.cr_uid != (uid_t) -1)
- current->fsuid = cred.cr_uid;
- else
- current->fsuid = exp->ex_anon_uid;
- if (cred.cr_gid != (gid_t) -1)
- current->fsgid = cred.cr_gid;
- else
- current->fsgid = exp->ex_anon_gid;
-
- if (!cred.cr_group_info)
+ /* discard any old override before preparing the new set */
+ revert_creds(get_cred(current->real_cred));
+ new = prepare_creds();
+ if (!new)
return -ENOMEM;
- ret = set_current_groups(cred.cr_group_info);
- put_group_info(cred.cr_group_info);
- if ((cred.cr_uid)) {
- current->cap_effective =
- cap_drop_nfsd_set(current->cap_effective);
+
+ new->fsuid = rqstp->rq_cred.cr_uid;
+ new->fsgid = rqstp->rq_cred.cr_gid;
+
+ rqgi = rqstp->rq_cred.cr_group_info;
+
+ if (flags & NFSEXP_ALLSQUASH) {
+ new->fsuid = exp->ex_anon_uid;
+ new->fsgid = exp->ex_anon_gid;
+ gi = groups_alloc(0);
+ } else if (flags & NFSEXP_ROOTSQUASH) {
+ if (!new->fsuid)
+ new->fsuid = exp->ex_anon_uid;
+ if (!new->fsgid)
+ new->fsgid = exp->ex_anon_gid;
+
+ gi = groups_alloc(rqgi->ngroups);
+ if (!gi)
+ goto oom;
+
+ for (i = 0; i < rqgi->ngroups; i++) {
+ if (!GROUP_AT(rqgi, i))
+ GROUP_AT(gi, i) = exp->ex_anon_gid;
+ else
+ GROUP_AT(gi, i) = GROUP_AT(rqgi, i);
+ }
} else {
- current->cap_effective =
- cap_raise_nfsd_set(current->cap_effective,
- current->cap_permitted);
+ gi = get_group_info(rqgi);
}
+
+ if (new->fsuid == (uid_t) -1)
+ new->fsuid = exp->ex_anon_uid;
+ if (new->fsgid == (gid_t) -1)
+ new->fsgid = exp->ex_anon_gid;
+
+ ret = set_groups(new, gi);
+ put_group_info(gi);
+ if (!ret)
+ goto error;
+
+ if (new->uid)
+ new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
+ else
+ new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
+ new->cap_permitted);
+ put_cred(override_creds(new));
+ return 0;
+
+oom:
+ ret = -ENOMEM;
+error:
+ abort_creds(new);
return ret;
}
+
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index bb93946..9371ea1 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -54,20 +54,26 @@
static struct path rec_dir;
static int rec_dir_init = 0;
-static void
-nfs4_save_user(uid_t *saveuid, gid_t *savegid)
+static int
+nfs4_save_creds(const struct cred **original_creds)
{
- *saveuid = current->fsuid;
- *savegid = current->fsgid;
- current->fsuid = 0;
- current->fsgid = 0;
+ struct cred *new;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ new->fsuid = 0;
+ new->fsgid = 0;
+ *original_creds = override_creds(new);
+ put_cred(new);
+ return 0;
}
static void
-nfs4_reset_user(uid_t saveuid, gid_t savegid)
+nfs4_reset_creds(const struct cred *original)
{
- current->fsuid = saveuid;
- current->fsgid = savegid;
+ revert_creds(original);
}
static void
@@ -129,10 +135,9 @@
int
nfsd4_create_clid_dir(struct nfs4_client *clp)
{
+ const struct cred *original_cred;
char *dname = clp->cl_recdir;
struct dentry *dentry;
- uid_t uid;
- gid_t gid;
int status;
dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
@@ -140,7 +145,9 @@
if (!rec_dir_init || clp->cl_firststate)
return 0;
- nfs4_save_user(&uid, &gid);
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ return status;
/* lock the parent */
mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
@@ -168,7 +175,7 @@
clp->cl_firststate = 1;
nfsd4_sync_rec_dir();
}
- nfs4_reset_user(uid, gid);
+ nfs4_reset_creds(original_cred);
dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
return status;
}
@@ -211,22 +218,24 @@
static int
nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
{
+ const struct cred *original_cred;
struct file *filp;
struct dentry_list_arg dla = {
.parent = dir,
};
struct list_head *dentries = &dla.dentries;
struct dentry_list *child;
- uid_t uid;
- gid_t gid;
int status;
if (!rec_dir_init)
return 0;
- nfs4_save_user(&uid, &gid);
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ return status;
- filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
+ filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
+ current_cred());
status = PTR_ERR(filp);
if (IS_ERR(filp))
goto out;
@@ -249,7 +258,7 @@
dput(child->dentry);
kfree(child);
}
- nfs4_reset_user(uid, gid);
+ nfs4_reset_creds(original_cred);
return status;
}
@@ -311,8 +320,7 @@
void
nfsd4_remove_clid_dir(struct nfs4_client *clp)
{
- uid_t uid;
- gid_t gid;
+ const struct cred *original_cred;
int status;
if (!rec_dir_init || !clp->cl_firststate)
@@ -322,9 +330,13 @@
if (status)
goto out;
clp->cl_firststate = 0;
- nfs4_save_user(&uid, &gid);
+
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ goto out;
+
status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
- nfs4_reset_user(uid, gid);
+ nfs4_reset_creds(original_cred);
if (status == 0)
nfsd4_sync_rec_dir();
mnt_drop_write(rec_dir.mnt);
@@ -401,16 +413,21 @@
void
nfsd4_init_recdir(char *rec_dirname)
{
- uid_t uid = 0;
- gid_t gid = 0;
- int status;
+ const struct cred *original_cred;
+ int status;
printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
rec_dirname);
BUG_ON(rec_dir_init);
- nfs4_save_user(&uid, &gid);
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0) {
+ printk("NFSD: Unable to change credentials to find recovery"
+ " directory: error %d\n",
+ status);
+ return;
+ }
status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
&rec_dir);
@@ -420,7 +437,7 @@
if (!status)
rec_dir_init = 1;
- nfs4_reset_user(uid, gid);
+ nfs4_reset_creds(original_cred);
}
void
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index cd25d91..f0da7d9 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -186,9 +186,14 @@
* access control settings being in effect, we cannot
* fix that case easily.
*/
- current->cap_effective =
- cap_raise_nfsd_set(current->cap_effective,
- current->cap_permitted);
+ struct cred *new = prepare_creds();
+ if (!new)
+ return nfserrno(-ENOMEM);
+ new->cap_effective =
+ cap_raise_nfsd_set(new->cap_effective,
+ new->cap_permitted);
+ put_cred(override_creds(new));
+ put_cred(new);
} else {
error = nfsd_setuser_and_check_port(rqstp, exp);
if (error)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 4433c8f..d1c5f78 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -671,6 +671,7 @@
nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
int access, struct file **filp)
{
+ const struct cred *cred = current_cred();
struct dentry *dentry;
struct inode *inode;
int flags = O_RDONLY|O_LARGEFILE;
@@ -725,7 +726,7 @@
DQUOT_INIT(inode);
}
*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
- flags);
+ flags, cred);
if (IS_ERR(*filp))
host_err = PTR_ERR(*filp);
out_nfserr:
@@ -1169,7 +1170,7 @@
* send along the gid on create when it tries to implement
* setgid directories via NFS:
*/
- if (current->fsuid != 0)
+ if (current_fsuid() != 0)
iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
if (iap->ia_valid)
return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
@@ -2001,7 +2002,7 @@
IS_APPEND(inode)? " append" : "",
__mnt_is_readonly(exp->ex_path.mnt)? " ro" : "");
dprintk(" owner %d/%d user %d/%d\n",
- inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
+ inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid());
#endif
/* Normally we reject any write/sattr etc access on a read-only file
@@ -2044,7 +2045,7 @@
* with NFSv3.
*/
if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
- inode->i_uid == current->fsuid)
+ inode->i_uid == current_fsuid())
return 0;
/* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c
index 533a789..3516d8a 100644
--- a/fs/ocfs2/dlm/dlmfs.c
+++ b/fs/ocfs2/dlm/dlmfs.c
@@ -339,8 +339,8 @@
ip = DLMFS_I(inode);
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
@@ -365,8 +365,8 @@
return NULL;
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index f4967e6..2545e74 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -421,13 +421,13 @@
fe->i_blkno = cpu_to_le64(fe_blkno);
fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
- fe->i_uid = cpu_to_le32(current->fsuid);
+ fe->i_uid = cpu_to_le32(current_fsuid());
if (dir->i_mode & S_ISGID) {
fe->i_gid = cpu_to_le32(dir->i_gid);
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- fe->i_gid = cpu_to_le32(current->fsgid);
+ fe->i_gid = cpu_to_le32(current_fsgid());
fe->i_mode = cpu_to_le16(mode);
if (S_ISCHR(mode) || S_ISBLK(mode))
fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index cbf047a..6afe57c 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -37,8 +37,8 @@
inode->i_ino = new_block;
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mapping->a_ops = &omfs_aops;
@@ -420,8 +420,8 @@
sb->s_fs_info = sbi;
- sbi->s_uid = current->uid;
- sbi->s_gid = current->gid;
+ sbi->s_uid = current_uid();
+ sbi->s_gid = current_gid();
sbi->s_dmask = sbi->s_fmask = current->fs->umask;
if (!parse_options((char *) data, sbi))
diff --git a/fs/open.c b/fs/open.c
index 83cdb9d..c0a426d 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -425,39 +425,33 @@
*/
asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
{
+ const struct cred *old_cred;
+ struct cred *override_cred;
struct path path;
struct inode *inode;
- int old_fsuid, old_fsgid;
- kernel_cap_t uninitialized_var(old_cap); /* !SECURE_NO_SETUID_FIXUP */
int res;
if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
return -EINVAL;
- old_fsuid = current->fsuid;
- old_fsgid = current->fsgid;
+ override_cred = prepare_creds();
+ if (!override_cred)
+ return -ENOMEM;
- current->fsuid = current->uid;
- current->fsgid = current->gid;
+ override_cred->fsuid = override_cred->uid;
+ override_cred->fsgid = override_cred->gid;
if (!issecure(SECURE_NO_SETUID_FIXUP)) {
- /*
- * Clear the capabilities if we switch to a non-root user
- */
-#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
- /*
- * FIXME: There is a race here against sys_capset. The
- * capabilities can change yet we will restore the old
- * value below. We should hold task_capabilities_lock,
- * but we cannot because user_path_at can sleep.
- */
-#endif /* ndef CONFIG_SECURITY_FILE_CAPABILITIES */
- if (current->uid)
- old_cap = cap_set_effective(__cap_empty_set);
+ /* Clear the capabilities if we switch to a non-root user */
+ if (override_cred->uid)
+ cap_clear(override_cred->cap_effective);
else
- old_cap = cap_set_effective(current->cap_permitted);
+ override_cred->cap_effective =
+ override_cred->cap_permitted;
}
+ old_cred = override_creds(override_cred);
+
res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
if (res)
goto out;
@@ -494,12 +488,8 @@
out_path_release:
path_put(&path);
out:
- current->fsuid = old_fsuid;
- current->fsgid = old_fsgid;
-
- if (!issecure(SECURE_NO_SETUID_FIXUP))
- cap_set_effective(old_cap);
-
+ revert_creds(old_cred);
+ put_cred(override_cred);
return res;
}
@@ -792,7 +782,8 @@
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
- int (*open)(struct inode *, struct file *))
+ int (*open)(struct inode *, struct file *),
+ const struct cred *cred)
{
struct inode *inode;
int error;
@@ -816,7 +807,7 @@
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
- error = security_dentry_open(f);
+ error = security_dentry_open(f, cred);
if (error)
goto cleanup_all;
@@ -891,6 +882,8 @@
struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *))
{
+ const struct cred *cred = current_cred();
+
if (IS_ERR(nd->intent.open.file))
goto out;
if (IS_ERR(dentry))
@@ -898,7 +891,7 @@
nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
nd->intent.open.flags - 1,
nd->intent.open.file,
- open);
+ open, cred);
out:
return nd->intent.open.file;
out_err:
@@ -917,6 +910,7 @@
*/
struct file *nameidata_to_filp(struct nameidata *nd, int flags)
{
+ const struct cred *cred = current_cred();
struct file *filp;
/* Pick up the filp from the open intent */
@@ -924,7 +918,7 @@
/* Has the filesystem initialised the file for us? */
if (filp->f_path.dentry == NULL)
filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
- NULL);
+ NULL, cred);
else
path_put(&nd->path);
return filp;
@@ -934,7 +928,8 @@
* dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
* error.
*/
-struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
+struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
+ const struct cred *cred)
{
int error;
struct file *f;
@@ -959,7 +954,7 @@
return ERR_PTR(error);
}
- return __dentry_open(dentry, mnt, flags, f, NULL);
+ return __dentry_open(dentry, mnt, flags, f, NULL, cred);
}
EXPORT_SYMBOL(dentry_open);
diff --git a/fs/pipe.c b/fs/pipe.c
index 7aea8b8..aaf797b 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -899,8 +899,8 @@
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IFIFO | S_IRUSR | S_IWUSR;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index aec931e..39df95a 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -217,11 +217,11 @@
switch(pa->e_tag) {
case ACL_USER_OBJ:
/* (May have been checked already) */
- if (inode->i_uid == current->fsuid)
+ if (inode->i_uid == current_fsuid())
goto check_perm;
break;
case ACL_USER:
- if (pa->e_id == current->fsuid)
+ if (pa->e_id == current_fsuid())
goto mask;
break;
case ACL_GROUP_OBJ:
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 6af7fba..7e4877d 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -159,6 +159,7 @@
struct group_info *group_info;
int g;
struct fdtable *fdt = NULL;
+ const struct cred *cred;
pid_t ppid, tpid;
rcu_read_lock();
@@ -170,6 +171,7 @@
if (tracer)
tpid = task_pid_nr_ns(tracer, ns);
}
+ cred = get_cred((struct cred *) __task_cred(p));
seq_printf(m,
"State:\t%s\n"
"Tgid:\t%d\n"
@@ -182,8 +184,8 @@
task_tgid_nr_ns(p, ns),
pid_nr_ns(pid, ns),
ppid, tpid,
- p->uid, p->euid, p->suid, p->fsuid,
- p->gid, p->egid, p->sgid, p->fsgid);
+ cred->uid, cred->euid, cred->suid, cred->fsuid,
+ cred->gid, cred->egid, cred->sgid, cred->fsgid);
task_lock(p);
if (p->files)
@@ -194,13 +196,12 @@
fdt ? fdt->max_fds : 0);
rcu_read_unlock();
- group_info = p->group_info;
- get_group_info(group_info);
+ group_info = cred->group_info;
task_unlock(p);
for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
seq_printf(m, "%d ", GROUP_AT(group_info, g));
- put_group_info(group_info);
+ put_cred(cred);
seq_printf(m, "\n");
}
@@ -262,7 +263,7 @@
blocked = p->blocked;
collect_sigign_sigcatch(p, &ignored, &caught);
num_threads = atomic_read(&p->signal->count);
- qsize = atomic_read(&p->user->sigpending);
+ qsize = atomic_read(&__task_cred(p)->user->sigpending);
qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
unlock_task_sighand(p, &flags);
}
@@ -293,10 +294,21 @@
static inline void task_cap(struct seq_file *m, struct task_struct *p)
{
- render_cap_t(m, "CapInh:\t", &p->cap_inheritable);
- render_cap_t(m, "CapPrm:\t", &p->cap_permitted);
- render_cap_t(m, "CapEff:\t", &p->cap_effective);
- render_cap_t(m, "CapBnd:\t", &p->cap_bset);
+ const struct cred *cred;
+ kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
+
+ rcu_read_lock();
+ cred = __task_cred(p);
+ cap_inheritable = cred->cap_inheritable;
+ cap_permitted = cred->cap_permitted;
+ cap_effective = cred->cap_effective;
+ cap_bset = cred->cap_bset;
+ rcu_read_unlock();
+
+ render_cap_t(m, "CapInh:\t", &cap_inheritable);
+ render_cap_t(m, "CapPrm:\t", &cap_permitted);
+ render_cap_t(m, "CapEff:\t", &cap_effective);
+ render_cap_t(m, "CapBnd:\t", &cap_bset);
}
static inline void task_context_switch_counts(struct seq_file *m,
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 486cf3f..cf42c42 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1406,6 +1406,7 @@
{
struct inode * inode;
struct proc_inode *ei;
+ const struct cred *cred;
/* We need a new inode */
@@ -1428,8 +1429,11 @@
inode->i_uid = 0;
inode->i_gid = 0;
if (task_dumpable(task)) {
- inode->i_uid = task->euid;
- inode->i_gid = task->egid;
+ rcu_read_lock();
+ cred = __task_cred(task);
+ inode->i_uid = cred->euid;
+ inode->i_gid = cred->egid;
+ rcu_read_unlock();
}
security_task_to_inode(task, inode);
@@ -1445,6 +1449,8 @@
{
struct inode *inode = dentry->d_inode;
struct task_struct *task;
+ const struct cred *cred;
+
generic_fillattr(inode, stat);
rcu_read_lock();
@@ -1454,8 +1460,9 @@
if (task) {
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
task_dumpable(task)) {
- stat->uid = task->euid;
- stat->gid = task->egid;
+ cred = __task_cred(task);
+ stat->uid = cred->euid;
+ stat->gid = cred->egid;
}
}
rcu_read_unlock();
@@ -1483,11 +1490,16 @@
{
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
+ const struct cred *cred;
+
if (task) {
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
task_dumpable(task)) {
- inode->i_uid = task->euid;
- inode->i_gid = task->egid;
+ rcu_read_lock();
+ cred = __task_cred(task);
+ inode->i_uid = cred->euid;
+ inode->i_gid = cred->egid;
+ rcu_read_unlock();
} else {
inode->i_uid = 0;
inode->i_gid = 0;
@@ -1649,6 +1661,7 @@
struct task_struct *task = get_proc_task(inode);
int fd = proc_fd(inode);
struct files_struct *files;
+ const struct cred *cred;
if (task) {
files = get_files_struct(task);
@@ -1658,8 +1671,11 @@
rcu_read_unlock();
put_files_struct(files);
if (task_dumpable(task)) {
- inode->i_uid = task->euid;
- inode->i_gid = task->egid;
+ rcu_read_lock();
+ cred = __task_cred(task);
+ inode->i_uid = cred->euid;
+ inode->i_gid = cred->egid;
+ rcu_read_unlock();
} else {
inode->i_uid = 0;
inode->i_gid = 0;
diff --git a/fs/quota.c b/fs/quota.c
index 7f4386e..b7fe44e 100644
--- a/fs/quota.c
+++ b/fs/quota.c
@@ -79,7 +79,7 @@
/* Check privileges */
if (cmd == Q_GETQUOTA) {
- if (((type == USRQUOTA && current->euid != id) ||
+ if (((type == USRQUOTA && current_euid() != id) ||
(type == GRPQUOTA && !in_egroup_p(id))) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -130,7 +130,7 @@
/* Check privileges */
if (cmd == Q_XGETQUOTA) {
- if (((type == XQM_USRQUOTA && current->euid != id) ||
+ if (((type == XQM_USRQUOTA && current_euid() != id) ||
(type == XQM_GRPQUOTA && !in_egroup_p(id))) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index f031d1c..a83a351 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -55,8 +55,8 @@
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mapping->a_ops = &ramfs_aops;
inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index f89ebb9..4f322e5 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -573,7 +573,7 @@
/* the quota init calls have to know who to charge the quota to, so
** we have to set uid and gid here
*/
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
inode->i_mode = mode;
/* Make inode invalid - just in case we are going to drop it before
* the initialization happens */
@@ -584,7 +584,7 @@
if (S_ISDIR(mode))
inode->i_mode |= S_ISGID;
} else {
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
}
DQUOT_INIT(inode);
return 0;
diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c
index 48da4fa..e7ddd03 100644
--- a/fs/smbfs/dir.c
+++ b/fs/smbfs/dir.c
@@ -667,8 +667,7 @@
attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
attr.ia_mode = mode;
- attr.ia_uid = current->euid;
- attr.ia_gid = current->egid;
+ current_euid_egid(&attr.ia_uid, &attr.ia_gid);
if (!new_valid_dev(dev))
return -EINVAL;
diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
index 3528f40..fc27fbf 100644
--- a/fs/smbfs/inode.c
+++ b/fs/smbfs/inode.c
@@ -586,7 +586,7 @@
if (parse_options(mnt, raw_data))
goto out_bad_option;
}
- mnt->mounted_uid = current->uid;
+ mnt->mounted_uid = current_uid();
smb_setcodepage(server, &mnt->codepage);
/*
diff --git a/fs/smbfs/proc.c b/fs/smbfs/proc.c
index ee536e8..9468168 100644
--- a/fs/smbfs/proc.c
+++ b/fs/smbfs/proc.c
@@ -864,7 +864,7 @@
goto out;
error = -EACCES;
- if (current->uid != server->mnt->mounted_uid &&
+ if (current_uid() != server->mnt->mounted_uid &&
!capable(CAP_SYS_ADMIN))
goto out;
diff --git a/fs/sysv/ialloc.c b/fs/sysv/ialloc.c
index 115ab0d..241e976 100644
--- a/fs/sysv/ialloc.c
+++ b/fs/sysv/ialloc.c
@@ -165,9 +165,9 @@
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
inode->i_ino = fs16_to_cpu(sbi, ino);
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
inode->i_blocks = 0;
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index 1a4973e..4a18f08 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -363,7 +363,7 @@
*/
static int can_use_rp(struct ubifs_info *c)
{
- if (current->fsuid == c->rp_uid || capable(CAP_SYS_RESOURCE) ||
+ if (current_fsuid() == c->rp_uid || capable(CAP_SYS_RESOURCE) ||
(c->rp_gid != 0 && in_group_p(c->rp_gid)))
return 1;
return 0;
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 526c01e..8561890 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -104,13 +104,13 @@
*/
inode->i_flags |= (S_NOCMTIME);
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
inode->i_mode = mode;
inode->i_mtime = inode->i_atime = inode->i_ctime =
ubifs_current_time(inode);
diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index a4f2b3c..31fc842 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -126,13 +126,13 @@
}
mutex_unlock(&sbi->s_alloc_mutex);
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else {
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
}
iinfo->i_location.logicalBlockNum = block;
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 082409c..f84bfaa 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -604,7 +604,7 @@
goto out;
iinfo = UDF_I(inode);
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
init_special_inode(inode, mode, rdev);
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
if (!fi) {
diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c
index ac181f6..6f5dcf0 100644
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -304,13 +304,13 @@
inode->i_ino = cg * uspi->s_ipg + bit;
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
+ inode->i_uid = current_fsuid();
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
inode->i_mode |= S_ISGID;
} else
- inode->i_gid = current->fsgid;
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_generation = 0;
diff --git a/fs/xfs/linux-2.6/xfs_cred.h b/fs/xfs/linux-2.6/xfs_cred.h
index 652721c..8c022cd 100644
--- a/fs/xfs/linux-2.6/xfs_cred.h
+++ b/fs/xfs/linux-2.6/xfs_cred.h
@@ -23,11 +23,9 @@
/*
* Credentials
*/
-typedef struct cred {
- /* EMPTY */
-} cred_t;
+typedef const struct cred cred_t;
-extern struct cred *sys_cred;
+extern cred_t *sys_cred;
/* this is a hack.. (assumes sys_cred is the only cred_t in the system) */
static inline int capable_cred(cred_t *cr, int cid)
diff --git a/fs/xfs/linux-2.6/xfs_globals.h b/fs/xfs/linux-2.6/xfs_globals.h
index 2770b00..6eda8a3 100644
--- a/fs/xfs/linux-2.6/xfs_globals.h
+++ b/fs/xfs/linux-2.6/xfs_globals.h
@@ -19,6 +19,6 @@
#define __XFS_GLOBALS_H__
extern uint64_t xfs_panic_mask; /* set to cause more panics */
-extern struct cred *sys_cred;
+extern cred_t *sys_cred;
#endif /* __XFS_GLOBALS_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index d3438c7..281cbd5 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -256,6 +256,7 @@
struct file *parfilp,
struct inode *parinode)
{
+ const struct cred *cred = current_cred();
int error;
int new_fd;
int permflag;
@@ -321,7 +322,7 @@
mntget(parfilp->f_path.mnt);
/* Create file pointer. */
- filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags);
+ filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags, cred);
if (IS_ERR(filp)) {
put_unused_fd(new_fd);
return -XFS_ERROR(-PTR_ERR(filp));
@@ -1007,7 +1008,7 @@
* to the file owner ID, except in cases where the
* CAP_FSETID capability is applicable.
*/
- if (current->fsuid != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
+ if (current_fsuid() != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
code = XFS_ERROR(EPERM);
goto error_return;
}
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index b2f639a..91d6933 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -366,7 +366,7 @@
return ENOTDIR;
if (vp->i_sb->s_flags & MS_RDONLY)
return EROFS;
- if (XFS_I(vp)->i_d.di_uid != current->fsuid && !capable(CAP_FOWNER))
+ if (XFS_I(vp)->i_d.di_uid != current_fsuid() && !capable(CAP_FOWNER))
return EPERM;
return 0;
}
@@ -413,13 +413,13 @@
switch (fap->acl_entry[i].ae_tag) {
case ACL_USER_OBJ:
seen_userobj = 1;
- if (fuid != current->fsuid)
+ if (fuid != current_fsuid())
continue;
matched.ae_tag = ACL_USER_OBJ;
matched.ae_perm = allows;
break;
case ACL_USER:
- if (fap->acl_entry[i].ae_id != current->fsuid)
+ if (fap->acl_entry[i].ae_id != current_fsuid())
continue;
matched.ae_tag = ACL_USER;
matched.ae_perm = allows;
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 1420c49..6be310d 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -497,7 +497,7 @@
xfs_inode_t **, xfs_daddr_t, uint);
int xfs_iread_extents(struct xfs_trans *, xfs_inode_t *, int);
int xfs_ialloc(struct xfs_trans *, xfs_inode_t *, mode_t,
- xfs_nlink_t, xfs_dev_t, struct cred *, xfs_prid_t,
+ xfs_nlink_t, xfs_dev_t, cred_t *, xfs_prid_t,
int, struct xfs_buf **, boolean_t *, xfs_inode_t **);
void xfs_dinode_from_disk(struct xfs_icdinode *,
struct xfs_dinode_core *);
diff --git a/fs/xfs/xfs_vnodeops.h b/fs/xfs/xfs_vnodeops.h
index e932a96..7b0c2ab 100644
--- a/fs/xfs/xfs_vnodeops.h
+++ b/fs/xfs/xfs_vnodeops.h
@@ -16,7 +16,7 @@
int xfs_open(struct xfs_inode *ip);
int xfs_setattr(struct xfs_inode *ip, struct iattr *vap, int flags,
- struct cred *credp);
+ cred_t *credp);
#define XFS_ATTR_DMI 0x01 /* invocation from a DMI function */
#define XFS_ATTR_NONBLOCK 0x02 /* return EAGAIN if operation would block */
#define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */
@@ -28,24 +28,24 @@
int xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
struct xfs_inode **ipp, struct xfs_name *ci_name);
int xfs_create(struct xfs_inode *dp, struct xfs_name *name, mode_t mode,
- xfs_dev_t rdev, struct xfs_inode **ipp, struct cred *credp);
+ xfs_dev_t rdev, struct xfs_inode **ipp, cred_t *credp);
int xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
struct xfs_inode *ip);
int xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
struct xfs_name *target_name);
int xfs_mkdir(struct xfs_inode *dp, struct xfs_name *dir_name,
- mode_t mode, struct xfs_inode **ipp, struct cred *credp);
+ mode_t mode, struct xfs_inode **ipp, cred_t *credp);
int xfs_readdir(struct xfs_inode *dp, void *dirent, size_t bufsize,
xfs_off_t *offset, filldir_t filldir);
int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
const char *target_path, mode_t mode, struct xfs_inode **ipp,
- struct cred *credp);
+ cred_t *credp);
int xfs_inode_flush(struct xfs_inode *ip, int flags);
int xfs_set_dmattrs(struct xfs_inode *ip, u_int evmask, u_int16_t state);
int xfs_reclaim(struct xfs_inode *ip);
int xfs_change_file_space(struct xfs_inode *ip, int cmd,
xfs_flock64_t *bf, xfs_off_t offset,
- struct cred *credp, int attr_flags);
+ cred_t *credp, int attr_flags);
int xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
struct xfs_inode *src_ip, struct xfs_inode *target_dp,
struct xfs_name *target_name, struct xfs_inode *target_ip);
diff --git a/include/keys/keyring-type.h b/include/keys/keyring-type.h
new file mode 100644
index 0000000..843f872
--- /dev/null
+++ b/include/keys/keyring-type.h
@@ -0,0 +1,31 @@
+/* Keyring key type
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _KEYS_KEYRING_TYPE_H
+#define _KEYS_KEYRING_TYPE_H
+
+#include <linux/key.h>
+#include <linux/rcupdate.h>
+
+/*
+ * the keyring payload contains a list of the keys to which the keyring is
+ * subscribed
+ */
+struct keyring_list {
+ struct rcu_head rcu; /* RCU deletion hook */
+ unsigned short maxkeys; /* max keys this list can hold */
+ unsigned short nkeys; /* number of keys currently held */
+ unsigned short delkey; /* key to be unlinked by RCU */
+ struct key *keys[0];
+};
+
+
+#endif /* _KEYS_KEYRING_TYPE_H */
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 6272a39..e8ce2c4 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -99,6 +99,8 @@
#define AUDIT_OBJ_PID 1318 /* ptrace target */
#define AUDIT_TTY 1319 /* Input on an administrative TTY */
#define AUDIT_EOE 1320 /* End of multi-record event */
+#define AUDIT_BPRM_FCAPS 1321 /* Information about fcaps increasing perms */
+#define AUDIT_CAPSET 1322 /* Record showing argument to sys_capset */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
@@ -452,6 +454,10 @@
extern int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout);
extern int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification);
extern int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
+extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
+ const struct cred *new,
+ const struct cred *old);
+extern int __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
static inline int audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
@@ -501,6 +507,24 @@
return __audit_mq_getsetattr(mqdes, mqstat);
return 0;
}
+
+static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
+ const struct cred *new,
+ const struct cred *old)
+{
+ if (unlikely(!audit_dummy_context()))
+ return __audit_log_bprm_fcaps(bprm, new, old);
+ return 0;
+}
+
+static inline int audit_log_capset(pid_t pid, const struct cred *new,
+ const struct cred *old)
+{
+ if (unlikely(!audit_dummy_context()))
+ return __audit_log_capset(pid, new, old);
+ return 0;
+}
+
extern int audit_n_rules;
extern int audit_signals;
#else
@@ -532,6 +556,8 @@
#define audit_mq_timedreceive(d,l,p,t) ({ 0; })
#define audit_mq_notify(d,n) ({ 0; })
#define audit_mq_getsetattr(d,s) ({ 0; })
+#define audit_log_bprm_fcaps(b, ncr, ocr) ({ 0; })
+#define audit_log_capset(pid, ncr, ocr) ({ 0; })
#define audit_ptrace(t) ((void)0)
#define audit_n_rules 0
#define audit_signals 0
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 7394b5b..6cbfbe2 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -35,16 +35,20 @@
struct mm_struct *mm;
unsigned long p; /* current top of mem */
unsigned int sh_bang:1,
- misc_bang:1;
+ misc_bang:1,
+ cred_prepared:1,/* true if creds already prepared (multiple
+ * preps happen for interpreters) */
+ cap_effective:1;/* true if has elevated effective capabilities,
+ * false if not; except for init which inherits
+ * its parent's caps anyway */
#ifdef __alpha__
unsigned int taso:1;
#endif
unsigned int recursion_depth;
struct file * file;
- int e_uid, e_gid;
- kernel_cap_t cap_post_exec_permitted;
- bool cap_effective;
- void *security;
+ struct cred *cred; /* new credentials */
+ int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
+ unsigned int per_clear; /* bits to clear in current->personality */
int argc, envc;
char * filename; /* Name of binary as seen by procps */
char * interp; /* Name of the binary really executed. Most
@@ -101,7 +105,7 @@
int executable_stack);
extern int bprm_mm_init(struct linux_binprm *bprm);
extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
-extern void compute_creds(struct linux_binprm *binprm);
+extern void install_exec_creds(struct linux_binprm *bprm);
extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
extern int set_binfmt(struct linux_binfmt *new);
extern void free_bprm(struct linux_binprm *);
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 9d1fe30..e22f48c 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -53,6 +53,7 @@
#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
#define VFS_CAP_REVISION_MASK 0xFF000000
+#define VFS_CAP_REVISION_SHIFT 24
#define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
#define VFS_CAP_FLAGS_EFFECTIVE 0x000001
@@ -68,6 +69,9 @@
#define VFS_CAP_U32 VFS_CAP_U32_2
#define VFS_CAP_REVISION VFS_CAP_REVISION_2
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+extern int file_caps_enabled;
+#endif
struct vfs_cap_data {
__le32 magic_etc; /* Little endian */
@@ -96,6 +100,13 @@
__u32 cap[_KERNEL_CAPABILITY_U32S];
} kernel_cap_t;
+/* exact same as vfs_cap_data but in cpu endian and always filled completely */
+struct cpu_vfs_cap_data {
+ __u32 magic_etc;
+ kernel_cap_t permitted;
+ kernel_cap_t inheritable;
+};
+
#define _USER_CAP_HEADER_SIZE (sizeof(struct __user_cap_header_struct))
#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
@@ -454,6 +465,13 @@
return 1;
}
+/*
+ * Check if "a" is a subset of "set".
+ * return 1 if ALL of the capabilities in "a" are also in "set"
+ * cap_issubset(0101, 1111) will return 1
+ * return 0 if ANY of the capabilities in "a" are not in "set"
+ * cap_issubset(1111, 0101) will return 0
+ */
static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
{
kernel_cap_t dest;
@@ -501,8 +519,6 @@
extern const kernel_cap_t __cap_full_set;
extern const kernel_cap_t __cap_init_eff_set;
-kernel_cap_t cap_set_effective(const kernel_cap_t pE_new);
-
/**
* has_capability - Determine if a task has a superior capability available
* @t: The task in question
@@ -514,9 +530,14 @@
* Note that this does not set PF_SUPERPRIV on the task.
*/
#define has_capability(t, cap) (security_capable((t), (cap)) == 0)
+#define has_capability_noaudit(t, cap) (security_capable_noaudit((t), (cap)) == 0)
extern int capable(int cap);
+/* audit system wants to get cap info from files as well */
+struct dentry;
+extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps);
+
#endif /* __KERNEL__ */
#endif /* !_LINUX_CAPABILITY_H */
diff --git a/include/linux/cred.h b/include/linux/cred.h
index b69222c..26c1ab1 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -1,4 +1,4 @@
-/* Credentials management
+/* Credentials management - see Documentation/credentials.txt
*
* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
@@ -12,39 +12,333 @@
#ifndef _LINUX_CRED_H
#define _LINUX_CRED_H
-#define get_current_user() (get_uid(current->user))
+#include <linux/capability.h>
+#include <linux/key.h>
+#include <asm/atomic.h>
-#define task_uid(task) ((task)->uid)
-#define task_gid(task) ((task)->gid)
-#define task_euid(task) ((task)->euid)
-#define task_egid(task) ((task)->egid)
+struct user_struct;
+struct cred;
+struct inode;
-#define current_uid() (current->uid)
-#define current_gid() (current->gid)
-#define current_euid() (current->euid)
-#define current_egid() (current->egid)
-#define current_suid() (current->suid)
-#define current_sgid() (current->sgid)
-#define current_fsuid() (current->fsuid)
-#define current_fsgid() (current->fsgid)
-#define current_cap() (current->cap_effective)
+/*
+ * COW Supplementary groups list
+ */
+#define NGROUPS_SMALL 32
+#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
+
+struct group_info {
+ atomic_t usage;
+ int ngroups;
+ int nblocks;
+ gid_t small_block[NGROUPS_SMALL];
+ gid_t *blocks[0];
+};
+
+/**
+ * get_group_info - Get a reference to a group info structure
+ * @group_info: The group info to reference
+ *
+ * This gets a reference to a set of supplementary groups.
+ *
+ * If the caller is accessing a task's credentials, they must hold the RCU read
+ * lock when reading.
+ */
+static inline struct group_info *get_group_info(struct group_info *gi)
+{
+ atomic_inc(&gi->usage);
+ return gi;
+}
+
+/**
+ * put_group_info - Release a reference to a group info structure
+ * @group_info: The group info to release
+ */
+#define put_group_info(group_info) \
+do { \
+ if (atomic_dec_and_test(&(group_info)->usage)) \
+ groups_free(group_info); \
+} while (0)
+
+extern struct group_info *groups_alloc(int);
+extern void groups_free(struct group_info *);
+extern int set_current_groups(struct group_info *);
+extern int set_groups(struct cred *, struct group_info *);
+extern int groups_search(const struct group_info *, gid_t);
+
+/* access the groups "array" with this macro */
+#define GROUP_AT(gi, i) \
+ ((gi)->blocks[(i) / NGROUPS_PER_BLOCK][(i) % NGROUPS_PER_BLOCK])
+
+extern int in_group_p(gid_t);
+extern int in_egroup_p(gid_t);
+
+/*
+ * The common credentials for a thread group
+ * - shared by CLONE_THREAD
+ */
+#ifdef CONFIG_KEYS
+struct thread_group_cred {
+ atomic_t usage;
+ pid_t tgid; /* thread group process ID */
+ spinlock_t lock;
+ struct key *session_keyring; /* keyring inherited over fork */
+ struct key *process_keyring; /* keyring private to this process */
+ struct rcu_head rcu; /* RCU deletion hook */
+};
+#endif
+
+/*
+ * The security context of a task
+ *
+ * The parts of the context break down into two categories:
+ *
+ * (1) The objective context of a task. These parts are used when some other
+ * task is attempting to affect this one.
+ *
+ * (2) The subjective context. These details are used when the task is acting
+ * upon another object, be that a file, a task, a key or whatever.
+ *
+ * Note that some members of this structure belong to both categories - the
+ * LSM security pointer for instance.
+ *
+ * A task has two security pointers. task->real_cred points to the objective
+ * context that defines that task's actual details. The objective part of this
+ * context is used whenever that task is acted upon.
+ *
+ * task->cred points to the subjective context that defines the details of how
+ * that task is going to act upon another object. This may be overridden
+ * temporarily to point to another security context, but normally points to the
+ * same context as task->real_cred.
+ */
+struct cred {
+ atomic_t usage;
+ uid_t uid; /* real UID of the task */
+ gid_t gid; /* real GID of the task */
+ uid_t suid; /* saved UID of the task */
+ gid_t sgid; /* saved GID of the task */
+ uid_t euid; /* effective UID of the task */
+ gid_t egid; /* effective GID of the task */
+ uid_t fsuid; /* UID for VFS ops */
+ gid_t fsgid; /* GID for VFS ops */
+ unsigned securebits; /* SUID-less security management */
+ kernel_cap_t cap_inheritable; /* caps our children can inherit */
+ kernel_cap_t cap_permitted; /* caps we're permitted */
+ kernel_cap_t cap_effective; /* caps we can actually use */
+ kernel_cap_t cap_bset; /* capability bounding set */
+#ifdef CONFIG_KEYS
+ unsigned char jit_keyring; /* default keyring to attach requested
+ * keys to */
+ struct key *thread_keyring; /* keyring private to this thread */
+ struct key *request_key_auth; /* assumed request_key authority */
+ struct thread_group_cred *tgcred; /* thread-group shared credentials */
+#endif
+#ifdef CONFIG_SECURITY
+ void *security; /* subjective LSM security */
+#endif
+ struct user_struct *user; /* real user ID subscription */
+ struct group_info *group_info; /* supplementary groups for euid/fsgid */
+ struct rcu_head rcu; /* RCU deletion hook */
+};
+
+extern void __put_cred(struct cred *);
+extern int copy_creds(struct task_struct *, unsigned long);
+extern struct cred *prepare_creds(void);
+extern struct cred *prepare_exec_creds(void);
+extern struct cred *prepare_usermodehelper_creds(void);
+extern int commit_creds(struct cred *);
+extern void abort_creds(struct cred *);
+extern const struct cred *override_creds(const struct cred *);
+extern void revert_creds(const struct cred *);
+extern struct cred *prepare_kernel_cred(struct task_struct *);
+extern int change_create_files_as(struct cred *, struct inode *);
+extern int set_security_override(struct cred *, u32);
+extern int set_security_override_from_ctx(struct cred *, const char *);
+extern int set_create_files_as(struct cred *, struct inode *);
+extern void __init cred_init(void);
+
+/**
+ * get_new_cred - Get a reference on a new set of credentials
+ * @cred: The new credentials to reference
+ *
+ * Get a reference on the specified set of new credentials. The caller must
+ * release the reference.
+ */
+static inline struct cred *get_new_cred(struct cred *cred)
+{
+ atomic_inc(&cred->usage);
+ return cred;
+}
+
+/**
+ * get_cred - Get a reference on a set of credentials
+ * @cred: The credentials to reference
+ *
+ * Get a reference on the specified set of credentials. The caller must
+ * release the reference.
+ *
+ * This is used to deal with a committed set of credentials. Although the
+ * pointer is const, this will temporarily discard the const and increment the
+ * usage count. The purpose of this is to attempt to catch at compile time the
+ * accidental alteration of a set of credentials that should be considered
+ * immutable.
+ */
+static inline const struct cred *get_cred(const struct cred *cred)
+{
+ return get_new_cred((struct cred *) cred);
+}
+
+/**
+ * put_cred - Release a reference to a set of credentials
+ * @cred: The credentials to release
+ *
+ * Release a reference to a set of credentials, deleting them when the last ref
+ * is released.
+ *
+ * This takes a const pointer to a set of credentials because the credentials
+ * on task_struct are attached by const pointers to prevent accidental
+ * alteration of otherwise immutable credential sets.
+ */
+static inline void put_cred(const struct cred *_cred)
+{
+ struct cred *cred = (struct cred *) _cred;
+
+ BUG_ON(atomic_read(&(cred)->usage) <= 0);
+ if (atomic_dec_and_test(&(cred)->usage))
+ __put_cred(cred);
+}
+
+/**
+ * current_cred - Access the current task's subjective credentials
+ *
+ * Access the subjective credentials of the current task.
+ */
+#define current_cred() \
+ (current->cred)
+
+/**
+ * __task_cred - Access a task's objective credentials
+ * @task: The task to query
+ *
+ * Access the objective credentials of a task. The caller must hold the RCU
+ * readlock.
+ *
+ * The caller must make sure task doesn't go away, either by holding a ref on
+ * task or by holding tasklist_lock to prevent it from being unlinked.
+ */
+#define __task_cred(task) \
+ ((const struct cred *)(rcu_dereference((task)->real_cred)))
+
+/**
+ * get_task_cred - Get another task's objective credentials
+ * @task: The task to query
+ *
+ * Get the objective credentials of a task, pinning them so that they can't go
+ * away. Accessing a task's credentials directly is not permitted.
+ *
+ * The caller must make sure task doesn't go away, either by holding a ref on
+ * task or by holding tasklist_lock to prevent it from being unlinked.
+ */
+#define get_task_cred(task) \
+({ \
+ struct cred *__cred; \
+ rcu_read_lock(); \
+ __cred = (struct cred *) __task_cred((task)); \
+ get_cred(__cred); \
+ rcu_read_unlock(); \
+ __cred; \
+})
+
+/**
+ * get_current_cred - Get the current task's subjective credentials
+ *
+ * Get the subjective credentials of the current task, pinning them so that
+ * they can't go away. Accessing the current task's credentials directly is
+ * not permitted.
+ */
+#define get_current_cred() \
+ (get_cred(current_cred()))
+
+/**
+ * get_current_user - Get the current task's user_struct
+ *
+ * Get the user record of the current task, pinning it so that it can't go
+ * away.
+ */
+#define get_current_user() \
+({ \
+ struct user_struct *__u; \
+ struct cred *__cred; \
+ __cred = (struct cred *) current_cred(); \
+ __u = get_uid(__cred->user); \
+ __u; \
+})
+
+/**
+ * get_current_groups - Get the current task's supplementary group list
+ *
+ * Get the supplementary group list of the current task, pinning it so that it
+ * can't go away.
+ */
+#define get_current_groups() \
+({ \
+ struct group_info *__groups; \
+ struct cred *__cred; \
+ __cred = (struct cred *) current_cred(); \
+ __groups = get_group_info(__cred->group_info); \
+ __groups; \
+})
+
+#define task_cred_xxx(task, xxx) \
+({ \
+ __typeof__(((struct cred *)NULL)->xxx) ___val; \
+ rcu_read_lock(); \
+ ___val = __task_cred((task))->xxx; \
+ rcu_read_unlock(); \
+ ___val; \
+})
+
+#define task_uid(task) (task_cred_xxx((task), uid))
+#define task_euid(task) (task_cred_xxx((task), euid))
+
+#define current_cred_xxx(xxx) \
+({ \
+ current->cred->xxx; \
+})
+
+#define current_uid() (current_cred_xxx(uid))
+#define current_gid() (current_cred_xxx(gid))
+#define current_euid() (current_cred_xxx(euid))
+#define current_egid() (current_cred_xxx(egid))
+#define current_suid() (current_cred_xxx(suid))
+#define current_sgid() (current_cred_xxx(sgid))
+#define current_fsuid() (current_cred_xxx(fsuid))
+#define current_fsgid() (current_cred_xxx(fsgid))
+#define current_cap() (current_cred_xxx(cap_effective))
+#define current_user() (current_cred_xxx(user))
+#define current_security() (current_cred_xxx(security))
#define current_uid_gid(_uid, _gid) \
do { \
- *(_uid) = current->uid; \
- *(_gid) = current->gid; \
+ const struct cred *__cred; \
+ __cred = current_cred(); \
+ *(_uid) = __cred->uid; \
+ *(_gid) = __cred->gid; \
} while(0)
-#define current_euid_egid(_uid, _gid) \
+#define current_euid_egid(_euid, _egid) \
do { \
- *(_uid) = current->euid; \
- *(_gid) = current->egid; \
+ const struct cred *__cred; \
+ __cred = current_cred(); \
+ *(_euid) = __cred->euid; \
+ *(_egid) = __cred->egid; \
} while(0)
-#define current_fsuid_fsgid(_uid, _gid) \
+#define current_fsuid_fsgid(_fsuid, _fsgid) \
do { \
- *(_uid) = current->fsuid; \
- *(_gid) = current->fsgid; \
+ const struct cred *__cred; \
+ __cred = current_cred(); \
+ *(_fsuid) = __cred->fsuid; \
+ *(_fsgid) = __cred->fsgid; \
} while(0)
#endif /* _LINUX_CRED_H */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0dcdd94..c0fb6d8 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -315,6 +315,7 @@
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
+struct cred;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
@@ -826,7 +827,7 @@
fmode_t f_mode;
loff_t f_pos;
struct fown_struct f_owner;
- unsigned int f_uid, f_gid;
+ const struct cred *f_cred;
struct file_ra_state f_ra;
u64 f_version;
@@ -1193,7 +1194,7 @@
#define has_fs_excl() atomic_read(¤t->fs_excl)
#define is_owner_or_cap(inode) \
- ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
+ ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
/* not quite ready to be deprecated, but... */
extern void lock_super(struct super_block *);
@@ -1673,7 +1674,8 @@
extern long do_sys_open(int dfd, const char __user *filename, int flags,
int mode);
extern struct file *filp_open(const char *, int, int);
-extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
+extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
+ const struct cred *);
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 23fd890..2597858 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -113,6 +113,8 @@
# define CAP_INIT_BSET CAP_INIT_EFF_SET
#endif
+extern struct cred init_cred;
+
/*
* INIT_TASK is used to set up the first task table, touch at
* your own risk!. Base=0, limit=0x1fffff (=2MB)
@@ -147,13 +149,10 @@
.children = LIST_HEAD_INIT(tsk.children), \
.sibling = LIST_HEAD_INIT(tsk.sibling), \
.group_leader = &tsk, \
- .group_info = &init_groups, \
- .cap_effective = CAP_INIT_EFF_SET, \
- .cap_inheritable = CAP_INIT_INH_SET, \
- .cap_permitted = CAP_FULL_SET, \
- .cap_bset = CAP_INIT_BSET, \
- .securebits = SECUREBITS_DEFAULT, \
- .user = INIT_USER, \
+ .real_cred = &init_cred, \
+ .cred = &init_cred, \
+ .cred_exec_mutex = \
+ __MUTEX_INITIALIZER(tsk.cred_exec_mutex), \
.comm = "swapper", \
.thread = INIT_THREAD, \
.fs = &init_fs, \
diff --git a/include/linux/key-ui.h b/include/linux/key-ui.h
deleted file mode 100644
index e8b8a7a..0000000
--- a/include/linux/key-ui.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/* key-ui.h: key userspace interface stuff
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _LINUX_KEY_UI_H
-#define _LINUX_KEY_UI_H
-
-#include <linux/key.h>
-
-/* the key tree */
-extern struct rb_root key_serial_tree;
-extern spinlock_t key_serial_lock;
-
-/* required permissions */
-#define KEY_VIEW 0x01 /* require permission to view attributes */
-#define KEY_READ 0x02 /* require permission to read content */
-#define KEY_WRITE 0x04 /* require permission to update / modify */
-#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
-#define KEY_LINK 0x10 /* require permission to link */
-#define KEY_SETATTR 0x20 /* require permission to change attributes */
-#define KEY_ALL 0x3f /* all the above permissions */
-
-/*
- * the keyring payload contains a list of the keys to which the keyring is
- * subscribed
- */
-struct keyring_list {
- struct rcu_head rcu; /* RCU deletion hook */
- unsigned short maxkeys; /* max keys this list can hold */
- unsigned short nkeys; /* number of keys currently held */
- unsigned short delkey; /* key to be unlinked by RCU */
- struct key *keys[0];
-};
-
-/*
- * check to see whether permission is granted to use a key in the desired way
- */
-extern int key_task_permission(const key_ref_t key_ref,
- struct task_struct *context,
- key_perm_t perm);
-
-static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
-{
- return key_task_permission(key_ref, current, perm);
-}
-
-extern key_ref_t lookup_user_key(struct task_struct *context,
- key_serial_t id, int create, int partial,
- key_perm_t perm);
-
-extern long join_session_keyring(const char *name);
-
-extern struct key_type *key_type_lookup(const char *type);
-extern void key_type_put(struct key_type *ktype);
-
-#define key_negative_timeout 60 /* default timeout on a negative key's existence */
-
-
-#endif /* _LINUX_KEY_UI_H */
diff --git a/include/linux/key.h b/include/linux/key.h
index 1b70e35..21d32a1 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -73,6 +73,7 @@
struct seq_file;
struct user_struct;
struct signal_struct;
+struct cred;
struct key_type;
struct key_owner;
@@ -181,7 +182,7 @@
extern struct key *key_alloc(struct key_type *type,
const char *desc,
uid_t uid, gid_t gid,
- struct task_struct *ctx,
+ const struct cred *cred,
key_perm_t perm,
unsigned long flags);
@@ -249,7 +250,7 @@
struct key *key);
extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
- struct task_struct *ctx,
+ const struct cred *cred,
unsigned long flags,
struct key *dest);
@@ -276,24 +277,11 @@
/*
* the userspace interface
*/
-extern void switch_uid_keyring(struct user_struct *new_user);
-extern int copy_keys(unsigned long clone_flags, struct task_struct *tsk);
-extern int copy_thread_group_keys(struct task_struct *tsk);
-extern void exit_keys(struct task_struct *tsk);
-extern void exit_thread_group_keys(struct signal_struct *tg);
-extern int suid_keys(struct task_struct *tsk);
-extern int exec_keys(struct task_struct *tsk);
+extern int install_thread_keyring_to_cred(struct cred *cred);
extern void key_fsuid_changed(struct task_struct *tsk);
extern void key_fsgid_changed(struct task_struct *tsk);
extern void key_init(void);
-#define __install_session_keyring(tsk, keyring) \
-({ \
- struct key *old_session = tsk->signal->session_keyring; \
- tsk->signal->session_keyring = keyring; \
- old_session; \
-})
-
#else /* CONFIG_KEYS */
#define key_validate(k) 0
@@ -302,17 +290,9 @@
#define key_revoke(k) do { } while(0)
#define key_put(k) do { } while(0)
#define key_ref_put(k) do { } while(0)
-#define make_key_ref(k, p) ({ NULL; })
-#define key_ref_to_ptr(k) ({ NULL; })
+#define make_key_ref(k, p) NULL
+#define key_ref_to_ptr(k) NULL
#define is_key_possessed(k) 0
-#define switch_uid_keyring(u) do { } while(0)
-#define __install_session_keyring(t, k) ({ NULL; })
-#define copy_keys(f,t) 0
-#define copy_thread_group_keys(t) 0
-#define exit_keys(t) do { } while(0)
-#define exit_thread_group_keys(tg) do { } while(0)
-#define suid_keys(t) do { } while(0)
-#define exec_keys(t) do { } while(0)
#define key_fsuid_changed(t) do { } while(0)
#define key_fsgid_changed(t) do { } while(0)
#define key_init() do { } while(0)
diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
index 656ee6b..c0688eb 100644
--- a/include/linux/keyctl.h
+++ b/include/linux/keyctl.h
@@ -1,6 +1,6 @@
/* keyctl.h: keyctl command IDs
*
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004, 2008 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -20,6 +20,7 @@
#define KEY_SPEC_USER_SESSION_KEYRING -5 /* - key ID for UID-session keyring */
#define KEY_SPEC_GROUP_KEYRING -6 /* - key ID for GID-specific keyring */
#define KEY_SPEC_REQKEY_AUTH_KEY -7 /* - key ID for assumed request_key auth key */
+#define KEY_SPEC_REQUESTOR_KEYRING -8 /* - key ID for request_key() dest keyring */
/* request-key default keyrings */
#define KEY_REQKEY_DEFL_NO_CHANGE -1
@@ -30,6 +31,7 @@
#define KEY_REQKEY_DEFL_USER_KEYRING 4
#define KEY_REQKEY_DEFL_USER_SESSION_KEYRING 5
#define KEY_REQKEY_DEFL_GROUP_KEYRING 6
+#define KEY_REQKEY_DEFL_REQUESTOR_KEYRING 7
/* keyctl commands */
#define KEYCTL_GET_KEYRING_ID 0 /* ask for a keyring's ID */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 644ffbd..2036e9f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -572,12 +572,6 @@
*/
struct rlimit rlim[RLIM_NLIMITS];
- /* keep the process-shared keyrings here so that they do the right
- * thing in threads created with CLONE_THREAD */
-#ifdef CONFIG_KEYS
- struct key *session_keyring; /* keyring inherited over fork */
- struct key *process_keyring; /* keyring private to this process */
-#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
struct pacct_struct pacct; /* per-process accounting information */
#endif
@@ -661,6 +655,7 @@
extern struct user_struct root_user;
#define INIT_USER (&root_user)
+
struct backing_dev_info;
struct reclaim_state;
@@ -884,38 +879,7 @@
#endif /* !CONFIG_SMP */
struct io_context; /* See blkdev.h */
-#define NGROUPS_SMALL 32
-#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
-struct group_info {
- int ngroups;
- atomic_t usage;
- gid_t small_block[NGROUPS_SMALL];
- int nblocks;
- gid_t *blocks[0];
-};
-/*
- * get_group_info() must be called with the owning task locked (via task_lock())
- * when task != current. The reason being that the vast majority of callers are
- * looking at current->group_info, which can not be changed except by the
- * current task. Changing current->group_info requires the task lock, too.
- */
-#define get_group_info(group_info) do { \
- atomic_inc(&(group_info)->usage); \
-} while (0)
-
-#define put_group_info(group_info) do { \
- if (atomic_dec_and_test(&(group_info)->usage)) \
- groups_free(group_info); \
-} while (0)
-
-extern struct group_info *groups_alloc(int gidsetsize);
-extern void groups_free(struct group_info *group_info);
-extern int set_current_groups(struct group_info *group_info);
-extern int groups_search(struct group_info *group_info, gid_t grp);
-/* access the groups "array" with this macro */
-#define GROUP_AT(gi, i) \
- ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
extern void prefetch_stack(struct task_struct *t);
@@ -1182,17 +1146,12 @@
struct list_head cpu_timers[3];
/* process credentials */
- uid_t uid,euid,suid,fsuid;
- gid_t gid,egid,sgid,fsgid;
- struct group_info *group_info;
- kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
- struct user_struct *user;
- unsigned securebits;
-#ifdef CONFIG_KEYS
- unsigned char jit_keyring; /* default keyring to attach requested keys to */
- struct key *request_key_auth; /* assumed request_key authority */
- struct key *thread_keyring; /* keyring private to this thread */
-#endif
+ const struct cred *real_cred; /* objective and real subjective task
+ * credentials (COW) */
+ const struct cred *cred; /* effective (overridable) subjective task
+ * credentials (COW) */
+ struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */
+
char comm[TASK_COMM_LEN]; /* executable name excluding path
- access with [gs]et_task_comm (which lock
it with task_lock())
@@ -1229,9 +1188,6 @@
int (*notifier)(void *priv);
void *notifier_data;
sigset_t *notifier_mask;
-#ifdef CONFIG_SECURITY
- void *security;
-#endif
struct audit_context *audit_context;
#ifdef CONFIG_AUDITSYSCALL
uid_t loginuid;
@@ -1771,7 +1727,6 @@
return u;
}
extern void free_uid(struct user_struct *);
-extern void switch_uid(struct user_struct *);
extern void release_uids(struct user_namespace *ns);
#include <asm/current.h>
@@ -1790,9 +1745,6 @@
extern void sched_fork(struct task_struct *p, int clone_flags);
extern void sched_dead(struct task_struct *p);
-extern int in_group_p(gid_t);
-extern int in_egroup_p(gid_t);
-
extern void proc_caches_init(void);
extern void flush_signals(struct task_struct *);
extern void ignore_signals(struct task_struct *);
@@ -1924,6 +1876,8 @@
#define for_each_process(p) \
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
+extern bool is_single_threaded(struct task_struct *);
+
/*
* Careful: do_each_thread/while_each_thread is a double loop so
* 'break' will not work as expected - use goto instead.
diff --git a/include/linux/securebits.h b/include/linux/securebits.h
index 92f09bd..d2c5ed8 100644
--- a/include/linux/securebits.h
+++ b/include/linux/securebits.h
@@ -32,7 +32,7 @@
setting is locked or not. A setting which is locked cannot be
changed from user-level. */
#define issecure_mask(X) (1 << (X))
-#define issecure(X) (issecure_mask(X) & current->securebits)
+#define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits))
#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
issecure_mask(SECURE_NO_SETUID_FIXUP) | \
diff --git a/include/linux/security.h b/include/linux/security.h
index c13f1ce..59a11e1 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -37,6 +37,10 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
+/* If capable should audit the security request */
+#define SECURITY_CAP_NOAUDIT 0
+#define SECURITY_CAP_AUDIT 1
+
struct ctl_table;
struct audit_krule;
@@ -44,25 +48,25 @@
* These functions are in security/capability.c and are used
* as the default capabilities functions
*/
-extern int cap_capable(struct task_struct *tsk, int cap);
+extern int cap_capable(struct task_struct *tsk, int cap, int audit);
extern int cap_settime(struct timespec *ts, struct timezone *tz);
extern int cap_ptrace_may_access(struct task_struct *child, unsigned int mode);
extern int cap_ptrace_traceme(struct task_struct *parent);
extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
-extern int cap_capset_check(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
-extern void cap_capset_set(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
-extern int cap_bprm_set_security(struct linux_binprm *bprm);
-extern void cap_bprm_apply_creds(struct linux_binprm *bprm, int unsafe);
+extern int cap_capset(struct cred *new, const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted);
+extern int cap_bprm_set_creds(struct linux_binprm *bprm);
extern int cap_bprm_secureexec(struct linux_binprm *bprm);
extern int cap_inode_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
extern int cap_inode_removexattr(struct dentry *dentry, const char *name);
extern int cap_inode_need_killpriv(struct dentry *dentry);
extern int cap_inode_killpriv(struct dentry *dentry);
-extern int cap_task_post_setuid(uid_t old_ruid, uid_t old_euid, uid_t old_suid, int flags);
-extern void cap_task_reparent_to_init(struct task_struct *p);
+extern int cap_task_fix_setuid(struct cred *new, const struct cred *old, int flags);
extern int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
- unsigned long arg4, unsigned long arg5, long *rc_p);
+ unsigned long arg4, unsigned long arg5);
extern int cap_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp);
extern int cap_task_setioprio(struct task_struct *p, int ioprio);
extern int cap_task_setnice(struct task_struct *p, int nice);
@@ -105,7 +109,7 @@
struct sched_param;
struct request_sock;
-/* bprm_apply_creds unsafe reasons */
+/* bprm->unsafe reasons */
#define LSM_UNSAFE_SHARE 1
#define LSM_UNSAFE_PTRACE 2
#define LSM_UNSAFE_PTRACE_CAP 4
@@ -149,36 +153,7 @@
*
* Security hooks for program execution operations.
*
- * @bprm_alloc_security:
- * Allocate and attach a security structure to the @bprm->security field.
- * The security field is initialized to NULL when the bprm structure is
- * allocated.
- * @bprm contains the linux_binprm structure to be modified.
- * Return 0 if operation was successful.
- * @bprm_free_security:
- * @bprm contains the linux_binprm structure to be modified.
- * Deallocate and clear the @bprm->security field.
- * @bprm_apply_creds:
- * Compute and set the security attributes of a process being transformed
- * by an execve operation based on the old attributes (current->security)
- * and the information saved in @bprm->security by the set_security hook.
- * Since this hook function (and its caller) are void, this hook can not
- * return an error. However, it can leave the security attributes of the
- * process unchanged if an access failure occurs at this point.
- * bprm_apply_creds is called under task_lock. @unsafe indicates various
- * reasons why it may be unsafe to change security state.
- * @bprm contains the linux_binprm structure.
- * @bprm_post_apply_creds:
- * Runs after bprm_apply_creds with the task_lock dropped, so that
- * functions which cannot be called safely under the task_lock can
- * be used. This hook is a good place to perform state changes on
- * the process such as closing open file descriptors to which access
- * is no longer granted if the attributes were changed.
- * Note that a security module might need to save state between
- * bprm_apply_creds and bprm_post_apply_creds to store the decision
- * on whether the process may proceed.
- * @bprm contains the linux_binprm structure.
- * @bprm_set_security:
+ * @bprm_set_creds:
* Save security information in the bprm->security field, typically based
* on information about the bprm->file, for later use by the apply_creds
* hook. This hook may also optionally check permissions (e.g. for
@@ -191,15 +166,30 @@
* @bprm contains the linux_binprm structure.
* Return 0 if the hook is successful and permission is granted.
* @bprm_check_security:
- * This hook mediates the point when a search for a binary handler will
- * begin. It allows a check the @bprm->security value which is set in
- * the preceding set_security call. The primary difference from
- * set_security is that the argv list and envp list are reliably
- * available in @bprm. This hook may be called multiple times
- * during a single execve; and in each pass set_security is called
- * first.
+ * This hook mediates the point when a search for a binary handler will
+ * begin. It allows a check the @bprm->security value which is set in the
+ * preceding set_creds call. The primary difference from set_creds is
+ * that the argv list and envp list are reliably available in @bprm. This
+ * hook may be called multiple times during a single execve; and in each
+ * pass set_creds is called first.
* @bprm contains the linux_binprm structure.
* Return 0 if the hook is successful and permission is granted.
+ * @bprm_committing_creds:
+ * Prepare to install the new security attributes of a process being
+ * transformed by an execve operation, based on the old credentials
+ * pointed to by @current->cred and the information set in @bprm->cred by
+ * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
+ * This hook is a good place to perform state changes on the process such
+ * as closing open file descriptors to which access will no longer be
+ * granted when the attributes are changed. This is called immediately
+ * before commit_creds().
+ * @bprm_committed_creds:
+ * Tidy up after the installation of the new security attributes of a
+ * process being transformed by an execve operation. The new credentials
+ * have, by this point, been set to @current->cred. @bprm points to the
+ * linux_binprm structure. This hook is a good place to perform state
+ * changes on the process such as clearing out non-inheritable signal
+ * state. This is called immediately after commit_creds().
* @bprm_secureexec:
* Return a boolean value (0 or 1) indicating whether a "secure exec"
* is required. The flag is passed in the auxiliary table
@@ -585,15 +575,31 @@
* manual page for definitions of the @clone_flags.
* @clone_flags contains the flags indicating what should be shared.
* Return 0 if permission is granted.
- * @task_alloc_security:
- * @p contains the task_struct for child process.
- * Allocate and attach a security structure to the p->security field. The
- * security field is initialized to NULL when the task structure is
- * allocated.
- * Return 0 if operation was successful.
- * @task_free_security:
- * @p contains the task_struct for process.
- * Deallocate and clear the p->security field.
+ * @cred_free:
+ * @cred points to the credentials.
+ * Deallocate and clear the cred->security field in a set of credentials.
+ * @cred_prepare:
+ * @new points to the new credentials.
+ * @old points to the original credentials.
+ * @gfp indicates the atomicity of any memory allocations.
+ * Prepare a new set of credentials by copying the data from the old set.
+ * @cred_commit:
+ * @new points to the new credentials.
+ * @old points to the original credentials.
+ * Install a new set of credentials.
+ * @kernel_act_as:
+ * Set the credentials for a kernel service to act as (subjective context).
+ * @new points to the credentials to be modified.
+ * @secid specifies the security ID to be set
+ * The current task must be the one that nominated @secid.
+ * Return 0 if successful.
+ * @kernel_create_files_as:
+ * Set the file creation context in a set of credentials to be the same as
+ * the objective context of the specified inode.
+ * @new points to the credentials to be modified.
+ * @inode points to the inode to use as a reference.
+ * The current task must be the one that nominated @inode.
+ * Return 0 if successful.
* @task_setuid:
* Check permission before setting one or more of the user identity
* attributes of the current process. The @flags parameter indicates
@@ -606,15 +612,13 @@
* @id2 contains a uid.
* @flags contains one of the LSM_SETID_* values.
* Return 0 if permission is granted.
- * @task_post_setuid:
+ * @task_fix_setuid:
* Update the module's state after setting one or more of the user
* identity attributes of the current process. The @flags parameter
* indicates which of the set*uid system calls invoked this hook. If
- * @flags is LSM_SETID_FS, then @old_ruid is the old fs uid and the other
- * parameters are not used.
- * @old_ruid contains the old real uid (or fs uid if LSM_SETID_FS).
- * @old_euid contains the old effective uid (or -1 if LSM_SETID_FS).
- * @old_suid contains the old saved uid (or -1 if LSM_SETID_FS).
+ * @new is the set of credentials that will be installed. Modifications
+ * should be made to this rather than to @current->cred.
+ * @old is the set of credentials that are being replaces
* @flags contains one of the LSM_SETID_* values.
* Return 0 on success.
* @task_setgid:
@@ -717,13 +721,8 @@
* @arg3 contains a argument.
* @arg4 contains a argument.
* @arg5 contains a argument.
- * @rc_p contains a pointer to communicate back the forced return code
- * Return 0 if permission is granted, and non-zero if the security module
- * has taken responsibility (setting *rc_p) for the prctl call.
- * @task_reparent_to_init:
- * Set the security attributes in @p->security for a kernel thread that
- * is being reparented to the init task.
- * @p contains the task_struct for the kernel thread.
+ * Return -ENOSYS if no-one wanted to handle this op, any other value to
+ * cause prctl() to return immediately with that value.
* @task_to_inode:
* Set the security attributes for an inode based on an associated task's
* security attributes, e.g. for /proc/pid inodes.
@@ -1000,7 +999,7 @@
* See whether a specific operational right is granted to a process on a
* key.
* @key_ref refers to the key (key pointer + possession attribute bit).
- * @context points to the process to provide the context against which to
+ * @cred points to the credentials to provide the context against which to
* evaluate the security data on the key.
* @perm describes the combination of permissions required of this key.
* Return 1 if permission granted, 0 if permission denied and -ve it the
@@ -1162,6 +1161,7 @@
* @child process.
* Security modules may also want to perform a process tracing check
* during an execve in the set_security or apply_creds hooks of
+ * tracing check during an execve in the bprm_set_creds hook of
* binprm_security_ops if the process is being traced and its security
* attributes would be changed by the execve.
* @child contains the task_struct structure for the target process.
@@ -1185,29 +1185,15 @@
* @inheritable contains the inheritable capability set.
* @permitted contains the permitted capability set.
* Return 0 if the capability sets were successfully obtained.
- * @capset_check:
- * Check permission before setting the @effective, @inheritable, and
- * @permitted capability sets for the @target process.
- * Caveat: @target is also set to current if a set of processes is
- * specified (i.e. all processes other than current and init or a
- * particular process group). Hence, the capset_set hook may need to
- * revalidate permission to the actual target process.
- * @target contains the task_struct structure for target process.
- * @effective contains the effective capability set.
- * @inheritable contains the inheritable capability set.
- * @permitted contains the permitted capability set.
- * Return 0 if permission is granted.
- * @capset_set:
+ * @capset:
* Set the @effective, @inheritable, and @permitted capability sets for
- * the @target process. Since capset_check cannot always check permission
- * to the real @target process, this hook may also perform permission
- * checking to determine if the current process is allowed to set the
- * capability sets of the @target process. However, this hook has no way
- * of returning an error due to the structure of the sys_capset code.
- * @target contains the task_struct structure for target process.
+ * the current process.
+ * @new contains the new credentials structure for target process.
+ * @old contains the current credentials structure for target process.
* @effective contains the effective capability set.
* @inheritable contains the inheritable capability set.
* @permitted contains the permitted capability set.
+ * Return 0 and update @new if permission is granted.
* @capable:
* Check whether the @tsk process has the @cap capability.
* @tsk contains the task_struct for the process.
@@ -1299,15 +1285,12 @@
int (*capget) (struct task_struct *target,
kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted);
- int (*capset_check) (struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted);
- void (*capset_set) (struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted);
- int (*capable) (struct task_struct *tsk, int cap);
+ int (*capset) (struct cred *new,
+ const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted);
+ int (*capable) (struct task_struct *tsk, int cap, int audit);
int (*acct) (struct file *file);
int (*sysctl) (struct ctl_table *table, int op);
int (*quotactl) (int cmds, int type, int id, struct super_block *sb);
@@ -1316,13 +1299,11 @@
int (*settime) (struct timespec *ts, struct timezone *tz);
int (*vm_enough_memory) (struct mm_struct *mm, long pages);
- int (*bprm_alloc_security) (struct linux_binprm *bprm);
- void (*bprm_free_security) (struct linux_binprm *bprm);
- void (*bprm_apply_creds) (struct linux_binprm *bprm, int unsafe);
- void (*bprm_post_apply_creds) (struct linux_binprm *bprm);
- int (*bprm_set_security) (struct linux_binprm *bprm);
+ int (*bprm_set_creds) (struct linux_binprm *bprm);
int (*bprm_check_security) (struct linux_binprm *bprm);
int (*bprm_secureexec) (struct linux_binprm *bprm);
+ void (*bprm_committing_creds) (struct linux_binprm *bprm);
+ void (*bprm_committed_creds) (struct linux_binprm *bprm);
int (*sb_alloc_security) (struct super_block *sb);
void (*sb_free_security) (struct super_block *sb);
@@ -1406,14 +1387,18 @@
int (*file_send_sigiotask) (struct task_struct *tsk,
struct fown_struct *fown, int sig);
int (*file_receive) (struct file *file);
- int (*dentry_open) (struct file *file);
+ int (*dentry_open) (struct file *file, const struct cred *cred);
int (*task_create) (unsigned long clone_flags);
- int (*task_alloc_security) (struct task_struct *p);
- void (*task_free_security) (struct task_struct *p);
+ void (*cred_free) (struct cred *cred);
+ int (*cred_prepare)(struct cred *new, const struct cred *old,
+ gfp_t gfp);
+ void (*cred_commit)(struct cred *new, const struct cred *old);
+ int (*kernel_act_as)(struct cred *new, u32 secid);
+ int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
int (*task_setuid) (uid_t id0, uid_t id1, uid_t id2, int flags);
- int (*task_post_setuid) (uid_t old_ruid /* or fsuid */ ,
- uid_t old_euid, uid_t old_suid, int flags);
+ int (*task_fix_setuid) (struct cred *new, const struct cred *old,
+ int flags);
int (*task_setgid) (gid_t id0, gid_t id1, gid_t id2, int flags);
int (*task_setpgid) (struct task_struct *p, pid_t pgid);
int (*task_getpgid) (struct task_struct *p);
@@ -1433,8 +1418,7 @@
int (*task_wait) (struct task_struct *p);
int (*task_prctl) (int option, unsigned long arg2,
unsigned long arg3, unsigned long arg4,
- unsigned long arg5, long *rc_p);
- void (*task_reparent_to_init) (struct task_struct *p);
+ unsigned long arg5);
void (*task_to_inode) (struct task_struct *p, struct inode *inode);
int (*ipc_permission) (struct kern_ipc_perm *ipcp, short flag);
@@ -1539,10 +1523,10 @@
/* key management security hooks */
#ifdef CONFIG_KEYS
- int (*key_alloc) (struct key *key, struct task_struct *tsk, unsigned long flags);
+ int (*key_alloc) (struct key *key, const struct cred *cred, unsigned long flags);
void (*key_free) (struct key *key);
int (*key_permission) (key_ref_t key_ref,
- struct task_struct *context,
+ const struct cred *cred,
key_perm_t perm);
int (*key_getsecurity)(struct key *key, char **_buffer);
#endif /* CONFIG_KEYS */
@@ -1568,15 +1552,12 @@
kernel_cap_t *effective,
kernel_cap_t *inheritable,
kernel_cap_t *permitted);
-int security_capset_check(struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted);
-void security_capset_set(struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted);
+int security_capset(struct cred *new, const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted);
int security_capable(struct task_struct *tsk, int cap);
+int security_capable_noaudit(struct task_struct *tsk, int cap);
int security_acct(struct file *file);
int security_sysctl(struct ctl_table *table, int op);
int security_quotactl(int cmds, int type, int id, struct super_block *sb);
@@ -1586,12 +1567,10 @@
int security_vm_enough_memory(long pages);
int security_vm_enough_memory_mm(struct mm_struct *mm, long pages);
int security_vm_enough_memory_kern(long pages);
-int security_bprm_alloc(struct linux_binprm *bprm);
-void security_bprm_free(struct linux_binprm *bprm);
-void security_bprm_apply_creds(struct linux_binprm *bprm, int unsafe);
-void security_bprm_post_apply_creds(struct linux_binprm *bprm);
-int security_bprm_set(struct linux_binprm *bprm);
+int security_bprm_set_creds(struct linux_binprm *bprm);
int security_bprm_check(struct linux_binprm *bprm);
+void security_bprm_committing_creds(struct linux_binprm *bprm);
+void security_bprm_committed_creds(struct linux_binprm *bprm);
int security_bprm_secureexec(struct linux_binprm *bprm);
int security_sb_alloc(struct super_block *sb);
void security_sb_free(struct super_block *sb);
@@ -1663,13 +1642,16 @@
int security_file_send_sigiotask(struct task_struct *tsk,
struct fown_struct *fown, int sig);
int security_file_receive(struct file *file);
-int security_dentry_open(struct file *file);
+int security_dentry_open(struct file *file, const struct cred *cred);
int security_task_create(unsigned long clone_flags);
-int security_task_alloc(struct task_struct *p);
-void security_task_free(struct task_struct *p);
+void security_cred_free(struct cred *cred);
+int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp);
+void security_commit_creds(struct cred *new, const struct cred *old);
+int security_kernel_act_as(struct cred *new, u32 secid);
+int security_kernel_create_files_as(struct cred *new, struct inode *inode);
int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags);
-int security_task_post_setuid(uid_t old_ruid, uid_t old_euid,
- uid_t old_suid, int flags);
+int security_task_fix_setuid(struct cred *new, const struct cred *old,
+ int flags);
int security_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags);
int security_task_setpgid(struct task_struct *p, pid_t pgid);
int security_task_getpgid(struct task_struct *p);
@@ -1688,8 +1670,7 @@
int sig, u32 secid);
int security_task_wait(struct task_struct *p);
int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
- unsigned long arg4, unsigned long arg5, long *rc_p);
-void security_task_reparent_to_init(struct task_struct *p);
+ unsigned long arg4, unsigned long arg5);
void security_task_to_inode(struct task_struct *p, struct inode *inode);
int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag);
void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid);
@@ -1764,25 +1745,23 @@
return cap_capget(target, effective, inheritable, permitted);
}
-static inline int security_capset_check(struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
+static inline int security_capset(struct cred *new,
+ const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted)
{
- return cap_capset_check(target, effective, inheritable, permitted);
-}
-
-static inline void security_capset_set(struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
-{
- cap_capset_set(target, effective, inheritable, permitted);
+ return cap_capset(new, old, effective, inheritable, permitted);
}
static inline int security_capable(struct task_struct *tsk, int cap)
{
- return cap_capable(tsk, cap);
+ return cap_capable(tsk, cap, SECURITY_CAP_AUDIT);
+}
+
+static inline int security_capable_noaudit(struct task_struct *tsk, int cap)
+{
+ return cap_capable(tsk, cap, SECURITY_CAP_NOAUDIT);
}
static inline int security_acct(struct file *file)
@@ -1831,27 +1810,9 @@
return cap_vm_enough_memory(mm, pages);
}
-static inline int security_bprm_alloc(struct linux_binprm *bprm)
+static inline int security_bprm_set_creds(struct linux_binprm *bprm)
{
- return 0;
-}
-
-static inline void security_bprm_free(struct linux_binprm *bprm)
-{ }
-
-static inline void security_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
-{
- cap_bprm_apply_creds(bprm, unsafe);
-}
-
-static inline void security_bprm_post_apply_creds(struct linux_binprm *bprm)
-{
- return;
-}
-
-static inline int security_bprm_set(struct linux_binprm *bprm)
-{
- return cap_bprm_set_security(bprm);
+ return cap_bprm_set_creds(bprm);
}
static inline int security_bprm_check(struct linux_binprm *bprm)
@@ -1859,6 +1820,14 @@
return 0;
}
+static inline void security_bprm_committing_creds(struct linux_binprm *bprm)
+{
+}
+
+static inline void security_bprm_committed_creds(struct linux_binprm *bprm)
+{
+}
+
static inline int security_bprm_secureexec(struct linux_binprm *bprm)
{
return cap_bprm_secureexec(bprm);
@@ -2173,7 +2142,8 @@
return 0;
}
-static inline int security_dentry_open(struct file *file)
+static inline int security_dentry_open(struct file *file,
+ const struct cred *cred)
{
return 0;
}
@@ -2183,13 +2153,31 @@
return 0;
}
-static inline int security_task_alloc(struct task_struct *p)
+static inline void security_cred_free(struct cred *cred)
+{ }
+
+static inline int security_prepare_creds(struct cred *new,
+ const struct cred *old,
+ gfp_t gfp)
{
return 0;
}
-static inline void security_task_free(struct task_struct *p)
-{ }
+static inline void security_commit_creds(struct cred *new,
+ const struct cred *old)
+{
+}
+
+static inline int security_kernel_act_as(struct cred *cred, u32 secid)
+{
+ return 0;
+}
+
+static inline int security_kernel_create_files_as(struct cred *cred,
+ struct inode *inode)
+{
+ return 0;
+}
static inline int security_task_setuid(uid_t id0, uid_t id1, uid_t id2,
int flags)
@@ -2197,10 +2185,11 @@
return 0;
}
-static inline int security_task_post_setuid(uid_t old_ruid, uid_t old_euid,
- uid_t old_suid, int flags)
+static inline int security_task_fix_setuid(struct cred *new,
+ const struct cred *old,
+ int flags)
{
- return cap_task_post_setuid(old_ruid, old_euid, old_suid, flags);
+ return cap_task_fix_setuid(new, old, flags);
}
static inline int security_task_setgid(gid_t id0, gid_t id1, gid_t id2,
@@ -2287,14 +2276,9 @@
static inline int security_task_prctl(int option, unsigned long arg2,
unsigned long arg3,
unsigned long arg4,
- unsigned long arg5, long *rc_p)
+ unsigned long arg5)
{
- return cap_task_prctl(option, arg2, arg3, arg3, arg5, rc_p);
-}
-
-static inline void security_task_reparent_to_init(struct task_struct *p)
-{
- cap_task_reparent_to_init(p);
+ return cap_task_prctl(option, arg2, arg3, arg3, arg5);
}
static inline void security_task_to_inode(struct task_struct *p, struct inode *inode)
@@ -2720,16 +2704,16 @@
#ifdef CONFIG_KEYS
#ifdef CONFIG_SECURITY
-int security_key_alloc(struct key *key, struct task_struct *tsk, unsigned long flags);
+int security_key_alloc(struct key *key, const struct cred *cred, unsigned long flags);
void security_key_free(struct key *key);
int security_key_permission(key_ref_t key_ref,
- struct task_struct *context, key_perm_t perm);
+ const struct cred *cred, key_perm_t perm);
int security_key_getsecurity(struct key *key, char **_buffer);
#else
static inline int security_key_alloc(struct key *key,
- struct task_struct *tsk,
+ const struct cred *cred,
unsigned long flags)
{
return 0;
@@ -2740,7 +2724,7 @@
}
static inline int security_key_permission(key_ref_t key_ref,
- struct task_struct *context,
+ const struct cred *cred,
key_perm_t perm)
{
return 0;
diff --git a/include/net/scm.h b/include/net/scm.h
index 33e9986..f45bb6e 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -55,8 +55,8 @@
struct scm_cookie *scm)
{
struct task_struct *p = current;
- scm->creds.uid = p->uid;
- scm->creds.gid = p->gid;
+ scm->creds.uid = current_uid();
+ scm->creds.gid = current_gid();
scm->creds.pid = task_tgid_vnr(p);
scm->fp = NULL;
scm->seq = 0;
diff --git a/init/main.c b/init/main.c
index 7e117a2..db843bf 100644
--- a/init/main.c
+++ b/init/main.c
@@ -669,6 +669,7 @@
efi_enter_virtual_mode();
#endif
thread_info_cache_init();
+ cred_init();
fork_init(num_physpages);
proc_caches_init();
buffer_init();
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 68eb857..d9393f8 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -112,13 +112,14 @@
static struct inode *mqueue_get_inode(struct super_block *sb, int mode,
struct mq_attr *attr)
{
+ struct user_struct *u = current_user();
struct inode *inode;
inode = new_inode(sb);
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mtime = inode->i_ctime = inode->i_atime =
CURRENT_TIME;
@@ -126,7 +127,6 @@
if (S_ISREG(mode)) {
struct mqueue_inode_info *info;
struct task_struct *p = current;
- struct user_struct *u = p->user;
unsigned long mq_bytes, mq_msg_tblsz;
inode->i_fop = &mqueue_file_operations;
@@ -507,7 +507,7 @@
sig_i.si_code = SI_MESGQ;
sig_i.si_value = info->notify.sigev_value;
sig_i.si_pid = task_tgid_vnr(current);
- sig_i.si_uid = current->uid;
+ sig_i.si_uid = current_uid();
kill_pid_info(info->notify.sigev_signo,
&sig_i, info->notify_owner);
@@ -594,6 +594,7 @@
static struct file *do_create(struct dentry *dir, struct dentry *dentry,
int oflag, mode_t mode, struct mq_attr __user *u_attr)
{
+ const struct cred *cred = current_cred();
struct mq_attr attr;
struct file *result;
int ret;
@@ -618,7 +619,7 @@
if (ret)
goto out_drop_write;
- result = dentry_open(dentry, mqueue_mnt, oflag);
+ result = dentry_open(dentry, mqueue_mnt, oflag, cred);
/*
* dentry_open() took a persistent mnt_want_write(),
* so we can now drop this one.
@@ -637,8 +638,10 @@
/* Opens existing queue */
static struct file *do_open(struct dentry *dentry, int oflag)
{
-static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
- MAY_READ | MAY_WRITE };
+ const struct cred *cred = current_cred();
+
+ static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
+ MAY_READ | MAY_WRITE };
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
dput(dentry);
@@ -652,7 +655,7 @@
return ERR_PTR(-EACCES);
}
- return dentry_open(dentry, mqueue_mnt, oflag);
+ return dentry_open(dentry, mqueue_mnt, oflag, cred);
}
asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
diff --git a/ipc/shm.c b/ipc/shm.c
index 867e5d6..38a0557 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -366,7 +366,7 @@
if (shmflg & SHM_HUGETLB) {
/* hugetlb_file_setup takes care of mlock user accounting */
file = hugetlb_file_setup(name, size);
- shp->mlock_user = current->user;
+ shp->mlock_user = current_user();
} else {
int acctflag = VM_ACCOUNT;
/*
@@ -752,9 +752,10 @@
goto out_unlock;
if (!capable(CAP_IPC_LOCK)) {
+ uid_t euid = current_euid();
err = -EPERM;
- if (current->euid != shp->shm_perm.uid &&
- current->euid != shp->shm_perm.cuid)
+ if (euid != shp->shm_perm.uid &&
+ euid != shp->shm_perm.cuid)
goto out_unlock;
if (cmd == SHM_LOCK &&
!current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)
@@ -766,7 +767,7 @@
goto out_unlock;
if(cmd==SHM_LOCK) {
- struct user_struct * user = current->user;
+ struct user_struct *user = current_user();
if (!is_file_hugepages(shp->shm_file)) {
err = shmem_lock(shp->shm_file, 1, user);
if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){
diff --git a/ipc/util.c b/ipc/util.c
index 49b3ea6..c8a7670 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -258,6 +258,8 @@
int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
{
+ uid_t euid;
+ gid_t egid;
int id, err;
if (size > IPCMNI)
@@ -272,8 +274,9 @@
ids->in_use++;
- new->cuid = new->uid = current->euid;
- new->gid = new->cgid = current->egid;
+ current_euid_egid(&euid, &egid);
+ new->cuid = new->uid = euid;
+ new->gid = new->cgid = egid;
new->seq = ids->seq++;
if(ids->seq > ids->seq_max)
@@ -616,13 +619,15 @@
int ipcperms (struct kern_ipc_perm *ipcp, short flag)
{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
+ uid_t euid = current_euid();
int requested_mode, granted_mode, err;
if (unlikely((err = audit_ipc_obj(ipcp))))
return err;
requested_mode = (flag >> 6) | (flag >> 3) | flag;
granted_mode = ipcp->mode;
- if (current->euid == ipcp->cuid || current->euid == ipcp->uid)
+ if (euid == ipcp->cuid ||
+ euid == ipcp->uid)
granted_mode >>= 6;
else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
granted_mode >>= 3;
@@ -784,6 +789,7 @@
struct ipc64_perm *perm, int extra_perm)
{
struct kern_ipc_perm *ipcp;
+ uid_t euid;
int err;
down_write(&ids->rw_mutex);
@@ -803,8 +809,10 @@
if (err)
goto out_unlock;
}
- if (current->euid == ipcp->cuid ||
- current->euid == ipcp->uid || capable(CAP_SYS_ADMIN))
+
+ euid = current_euid();
+ if (euid == ipcp->cuid ||
+ euid == ipcp->uid || capable(CAP_SYS_ADMIN))
return ipcp;
err = -EPERM;
diff --git a/kernel/Makefile b/kernel/Makefile
index 9a3ec66..5a6a612 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -9,7 +9,7 @@
rcupdate.o extable.o params.o posix-timers.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
- notifier.o ksysfs.o pm_qos_params.o sched_clock.o
+ notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o
CFLAGS_REMOVE_sched.o = -mno-spe
diff --git a/kernel/acct.c b/kernel/acct.c
index f6006a6..d57b7cb 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -530,15 +530,14 @@
do_div(elapsed, AHZ);
ac.ac_btime = get_seconds() - elapsed;
/* we really need to bite the bullet and change layout */
- ac.ac_uid = current->uid;
- ac.ac_gid = current->gid;
+ current_uid_gid(&ac.ac_uid, &ac.ac_gid);
#if ACCT_VERSION==2
ac.ac_ahz = AHZ;
#endif
#if ACCT_VERSION==1 || ACCT_VERSION==2
/* backward-compatible 16 bit fields */
- ac.ac_uid16 = current->uid;
- ac.ac_gid16 = current->gid;
+ ac.ac_uid16 = ac.ac_uid;
+ ac.ac_gid16 = ac.ac_gid;
#endif
#if ACCT_VERSION==3
ac.ac_pid = task_tgid_nr_ns(current, ns);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cf5bc2f..bc1e2d8 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -65,6 +65,7 @@
#include <linux/highmem.h>
#include <linux/syscalls.h>
#include <linux/inotify.h>
+#include <linux/capability.h>
#include "audit.h"
@@ -84,6 +85,15 @@
/* determines whether we collect data for signals sent */
int audit_signals;
+struct audit_cap_data {
+ kernel_cap_t permitted;
+ kernel_cap_t inheritable;
+ union {
+ unsigned int fE; /* effective bit of a file capability */
+ kernel_cap_t effective; /* effective set of a process */
+ };
+};
+
/* When fs/namei.c:getname() is called, we store the pointer in name and
* we don't let putname() free it (instead we free all of the saved
* pointers at syscall exit time).
@@ -100,6 +110,8 @@
gid_t gid;
dev_t rdev;
u32 osid;
+ struct audit_cap_data fcap;
+ unsigned int fcap_ver;
};
struct audit_aux_data {
@@ -184,6 +196,20 @@
int pid_count;
};
+struct audit_aux_data_bprm_fcaps {
+ struct audit_aux_data d;
+ struct audit_cap_data fcap;
+ unsigned int fcap_ver;
+ struct audit_cap_data old_pcap;
+ struct audit_cap_data new_pcap;
+};
+
+struct audit_aux_data_capset {
+ struct audit_aux_data d;
+ pid_t pid;
+ struct audit_cap_data cap;
+};
+
struct audit_tree_refs {
struct audit_tree_refs *next;
struct audit_chunk *c[31];
@@ -421,6 +447,7 @@
struct audit_names *name,
enum audit_state *state)
{
+ const struct cred *cred = get_task_cred(tsk);
int i, j, need_sid = 1;
u32 sid;
@@ -440,28 +467,28 @@
}
break;
case AUDIT_UID:
- result = audit_comparator(tsk->uid, f->op, f->val);
+ result = audit_comparator(cred->uid, f->op, f->val);
break;
case AUDIT_EUID:
- result = audit_comparator(tsk->euid, f->op, f->val);
+ result = audit_comparator(cred->euid, f->op, f->val);
break;
case AUDIT_SUID:
- result = audit_comparator(tsk->suid, f->op, f->val);
+ result = audit_comparator(cred->suid, f->op, f->val);
break;
case AUDIT_FSUID:
- result = audit_comparator(tsk->fsuid, f->op, f->val);
+ result = audit_comparator(cred->fsuid, f->op, f->val);
break;
case AUDIT_GID:
- result = audit_comparator(tsk->gid, f->op, f->val);
+ result = audit_comparator(cred->gid, f->op, f->val);
break;
case AUDIT_EGID:
- result = audit_comparator(tsk->egid, f->op, f->val);
+ result = audit_comparator(cred->egid, f->op, f->val);
break;
case AUDIT_SGID:
- result = audit_comparator(tsk->sgid, f->op, f->val);
+ result = audit_comparator(cred->sgid, f->op, f->val);
break;
case AUDIT_FSGID:
- result = audit_comparator(tsk->fsgid, f->op, f->val);
+ result = audit_comparator(cred->fsgid, f->op, f->val);
break;
case AUDIT_PERS:
result = audit_comparator(tsk->personality, f->op, f->val);
@@ -615,8 +642,10 @@
break;
}
- if (!result)
+ if (!result) {
+ put_cred(cred);
return 0;
+ }
}
if (rule->filterkey && ctx)
ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
@@ -624,6 +653,7 @@
case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
}
+ put_cred(cred);
return 1;
}
@@ -1171,8 +1201,38 @@
kfree(buf);
}
+static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
+{
+ int i;
+
+ audit_log_format(ab, " %s=", prefix);
+ CAP_FOR_EACH_U32(i) {
+ audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
+ }
+}
+
+static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
+{
+ kernel_cap_t *perm = &name->fcap.permitted;
+ kernel_cap_t *inh = &name->fcap.inheritable;
+ int log = 0;
+
+ if (!cap_isclear(*perm)) {
+ audit_log_cap(ab, "cap_fp", perm);
+ log = 1;
+ }
+ if (!cap_isclear(*inh)) {
+ audit_log_cap(ab, "cap_fi", inh);
+ log = 1;
+ }
+
+ if (log)
+ audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
+}
+
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
+ const struct cred *cred;
int i, call_panic = 0;
struct audit_buffer *ab;
struct audit_aux_data *aux;
@@ -1182,14 +1242,15 @@
context->pid = tsk->pid;
if (!context->ppid)
context->ppid = sys_getppid();
- context->uid = tsk->uid;
- context->gid = tsk->gid;
- context->euid = tsk->euid;
- context->suid = tsk->suid;
- context->fsuid = tsk->fsuid;
- context->egid = tsk->egid;
- context->sgid = tsk->sgid;
- context->fsgid = tsk->fsgid;
+ cred = current_cred();
+ context->uid = cred->uid;
+ context->gid = cred->gid;
+ context->euid = cred->euid;
+ context->suid = cred->suid;
+ context->fsuid = cred->fsuid;
+ context->egid = cred->egid;
+ context->sgid = cred->sgid;
+ context->fsgid = cred->fsgid;
context->personality = tsk->personality;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
@@ -1334,6 +1395,28 @@
audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
break; }
+ case AUDIT_BPRM_FCAPS: {
+ struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
+ audit_log_format(ab, "fver=%x", axs->fcap_ver);
+ audit_log_cap(ab, "fp", &axs->fcap.permitted);
+ audit_log_cap(ab, "fi", &axs->fcap.inheritable);
+ audit_log_format(ab, " fe=%d", axs->fcap.fE);
+ audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
+ audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
+ audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
+ audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
+ audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
+ audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
+ break; }
+
+ case AUDIT_CAPSET: {
+ struct audit_aux_data_capset *axs = (void *)aux;
+ audit_log_format(ab, "pid=%d", axs->pid);
+ audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
+ audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
+ audit_log_cap(ab, "cap_pe", &axs->cap.effective);
+ break; }
+
}
audit_log_end(ab);
}
@@ -1421,6 +1504,8 @@
}
}
+ audit_log_fcaps(ab, n);
+
audit_log_end(ab);
}
@@ -1787,8 +1872,36 @@
return 0;
}
+
+static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry)
+{
+ struct cpu_vfs_cap_data caps;
+ int rc;
+
+ memset(&name->fcap.permitted, 0, sizeof(kernel_cap_t));
+ memset(&name->fcap.inheritable, 0, sizeof(kernel_cap_t));
+ name->fcap.fE = 0;
+ name->fcap_ver = 0;
+
+ if (!dentry)
+ return 0;
+
+ rc = get_vfs_caps_from_disk(dentry, &caps);
+ if (rc)
+ return rc;
+
+ name->fcap.permitted = caps.permitted;
+ name->fcap.inheritable = caps.inheritable;
+ name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+ name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+ return 0;
+}
+
+
/* Copy inode data into an audit_names. */
-static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
+static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
+ const struct inode *inode)
{
name->ino = inode->i_ino;
name->dev = inode->i_sb->s_dev;
@@ -1797,6 +1910,7 @@
name->gid = inode->i_gid;
name->rdev = inode->i_rdev;
security_inode_getsecid(inode, &name->osid);
+ audit_copy_fcaps(name, dentry);
}
/**
@@ -1831,7 +1945,7 @@
context->names[idx].name = NULL;
}
handle_path(dentry);
- audit_copy_inode(&context->names[idx], inode);
+ audit_copy_inode(&context->names[idx], dentry, inode);
}
/**
@@ -1892,7 +2006,7 @@
if (!strcmp(dname, n->name) ||
!audit_compare_dname_path(dname, n->name, &dirlen)) {
if (inode)
- audit_copy_inode(n, inode);
+ audit_copy_inode(n, NULL, inode);
else
n->ino = (unsigned long)-1;
found_child = n->name;
@@ -1906,7 +2020,7 @@
return;
idx = context->name_count - 1;
context->names[idx].name = NULL;
- audit_copy_inode(&context->names[idx], parent);
+ audit_copy_inode(&context->names[idx], NULL, parent);
}
if (!found_child) {
@@ -1927,7 +2041,7 @@
}
if (inode)
- audit_copy_inode(&context->names[idx], inode);
+ audit_copy_inode(&context->names[idx], NULL, inode);
else
context->names[idx].ino = (unsigned long)-1;
}
@@ -1978,7 +2092,7 @@
audit_log_format(ab, "login pid=%d uid=%u "
"old auid=%u new auid=%u"
" old ses=%u new ses=%u",
- task->pid, task->uid,
+ task->pid, task_uid(task),
task->loginuid, loginuid,
task->sessionid, sessionid);
audit_log_end(ab);
@@ -2361,7 +2475,7 @@
context->target_pid = t->pid;
context->target_auid = audit_get_loginuid(t);
- context->target_uid = t->uid;
+ context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
security_task_getsecid(t, &context->target_sid);
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
@@ -2380,6 +2494,7 @@
struct audit_aux_data_pids *axp;
struct task_struct *tsk = current;
struct audit_context *ctx = tsk->audit_context;
+ uid_t uid = current_uid(), t_uid = task_uid(t);
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
@@ -2387,7 +2502,7 @@
if (tsk->loginuid != -1)
audit_sig_uid = tsk->loginuid;
else
- audit_sig_uid = tsk->uid;
+ audit_sig_uid = uid;
security_task_getsecid(tsk, &audit_sig_sid);
}
if (!audit_signals || audit_dummy_context())
@@ -2399,7 +2514,7 @@
if (!ctx->target_pid) {
ctx->target_pid = t->tgid;
ctx->target_auid = audit_get_loginuid(t);
- ctx->target_uid = t->uid;
+ ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
security_task_getsecid(t, &ctx->target_sid);
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
@@ -2420,7 +2535,7 @@
axp->target_pid[axp->pid_count] = t->tgid;
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
- axp->target_uid[axp->pid_count] = t->uid;
+ axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
@@ -2430,6 +2545,86 @@
}
/**
+ * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
+ * @bprm: pointer to the bprm being processed
+ * @new: the proposed new credentials
+ * @old: the old credentials
+ *
+ * Simply check if the proc already has the caps given by the file and if not
+ * store the priv escalation info for later auditing at the end of the syscall
+ *
+ * -Eric
+ */
+int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
+ const struct cred *new, const struct cred *old)
+{
+ struct audit_aux_data_bprm_fcaps *ax;
+ struct audit_context *context = current->audit_context;
+ struct cpu_vfs_cap_data vcaps;
+ struct dentry *dentry;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ return -ENOMEM;
+
+ ax->d.type = AUDIT_BPRM_FCAPS;
+ ax->d.next = context->aux;
+ context->aux = (void *)ax;
+
+ dentry = dget(bprm->file->f_dentry);
+ get_vfs_caps_from_disk(dentry, &vcaps);
+ dput(dentry);
+
+ ax->fcap.permitted = vcaps.permitted;
+ ax->fcap.inheritable = vcaps.inheritable;
+ ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+ ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+ ax->old_pcap.permitted = old->cap_permitted;
+ ax->old_pcap.inheritable = old->cap_inheritable;
+ ax->old_pcap.effective = old->cap_effective;
+
+ ax->new_pcap.permitted = new->cap_permitted;
+ ax->new_pcap.inheritable = new->cap_inheritable;
+ ax->new_pcap.effective = new->cap_effective;
+ return 0;
+}
+
+/**
+ * __audit_log_capset - store information about the arguments to the capset syscall
+ * @pid: target pid of the capset call
+ * @new: the new credentials
+ * @old: the old (current) credentials
+ *
+ * Record the aguments userspace sent to sys_capset for later printing by the
+ * audit system if applicable
+ */
+int __audit_log_capset(pid_t pid,
+ const struct cred *new, const struct cred *old)
+{
+ struct audit_aux_data_capset *ax;
+ struct audit_context *context = current->audit_context;
+
+ if (likely(!audit_enabled || !context || context->dummy))
+ return 0;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ return -ENOMEM;
+
+ ax->d.type = AUDIT_CAPSET;
+ ax->d.next = context->aux;
+ context->aux = (void *)ax;
+
+ ax->pid = pid;
+ ax->cap.effective = new->cap_effective;
+ ax->cap.inheritable = new->cap_effective;
+ ax->cap.permitted = new->cap_permitted;
+
+ return 0;
+}
+
+/**
* audit_core_dumps - record information about processes that end abnormally
* @signr: signal value
*
@@ -2440,7 +2635,8 @@
{
struct audit_buffer *ab;
u32 sid;
- uid_t auid = audit_get_loginuid(current);
+ uid_t auid = audit_get_loginuid(current), uid;
+ gid_t gid;
unsigned int sessionid = audit_get_sessionid(current);
if (!audit_enabled)
@@ -2450,8 +2646,9 @@
return;
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+ current_uid_gid(&uid, &gid);
audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
- auid, current->uid, current->gid, sessionid);
+ auid, uid, gid, sessionid);
security_task_getsecid(current, &sid);
if (sid) {
char *ctx = NULL;
diff --git a/kernel/capability.c b/kernel/capability.c
index 33e51e7..36b4b4d 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -7,6 +7,7 @@
* 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net>
*/
+#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/module.h>
@@ -14,12 +15,7 @@
#include <linux/syscalls.h>
#include <linux/pid_namespace.h>
#include <asm/uaccess.h>
-
-/*
- * This lock protects task->cap_* for all tasks including current.
- * Locking rule: acquire this prior to tasklist_lock.
- */
-static DEFINE_SPINLOCK(task_capability_lock);
+#include "cred-internals.h"
/*
* Leveraged for setting/resetting capabilities
@@ -33,6 +29,17 @@
EXPORT_SYMBOL(__cap_full_set);
EXPORT_SYMBOL(__cap_init_eff_set);
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+int file_caps_enabled = 1;
+
+static int __init file_caps_disable(char *str)
+{
+ file_caps_enabled = 0;
+ return 1;
+}
+__setup("no_file_caps", file_caps_disable);
+#endif
+
/*
* More recent versions of libcap are available from:
*
@@ -115,167 +122,12 @@
return 0;
}
-#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
-
/*
- * Without filesystem capability support, we nominally support one process
- * setting the capabilities of another
- */
-static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
- kernel_cap_t *pIp, kernel_cap_t *pPp)
-{
- struct task_struct *target;
- int ret;
-
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
-
- if (pid && pid != task_pid_vnr(current)) {
- target = find_task_by_vpid(pid);
- if (!target) {
- ret = -ESRCH;
- goto out;
- }
- } else
- target = current;
-
- ret = security_capget(target, pEp, pIp, pPp);
-
-out:
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
-
- return ret;
-}
-
-/*
- * cap_set_pg - set capabilities for all processes in a given process
- * group. We call this holding task_capability_lock and tasklist_lock.
- */
-static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
-{
- struct task_struct *g, *target;
- int ret = -EPERM;
- int found = 0;
- struct pid *pgrp;
-
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
-
- pgrp = find_vpid(pgrp_nr);
- do_each_pid_task(pgrp, PIDTYPE_PGID, g) {
- target = g;
- while_each_thread(g, target) {
- if (!security_capset_check(target, effective,
- inheritable, permitted)) {
- security_capset_set(target, effective,
- inheritable, permitted);
- ret = 0;
- }
- found = 1;
- }
- } while_each_pid_task(pgrp, PIDTYPE_PGID, g);
-
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
-
- if (!found)
- ret = 0;
- return ret;
-}
-
-/*
- * cap_set_all - set capabilities for all processes other than init
- * and self. We call this holding task_capability_lock and tasklist_lock.
- */
-static inline int cap_set_all(kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
-{
- struct task_struct *g, *target;
- int ret = -EPERM;
- int found = 0;
-
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
-
- do_each_thread(g, target) {
- if (target == current
- || is_container_init(target->group_leader))
- continue;
- found = 1;
- if (security_capset_check(target, effective, inheritable,
- permitted))
- continue;
- ret = 0;
- security_capset_set(target, effective, inheritable, permitted);
- } while_each_thread(g, target);
-
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
-
- if (!found)
- ret = 0;
-
- return ret;
-}
-
-/*
- * Given the target pid does not refer to the current process we
- * need more elaborate support... (This support is not present when
- * filesystem capabilities are configured.)
- */
-static inline int do_sys_capset_other_tasks(pid_t pid, kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
-{
- struct task_struct *target;
- int ret;
-
- if (!capable(CAP_SETPCAP))
- return -EPERM;
-
- if (pid == -1) /* all procs other than current and init */
- return cap_set_all(effective, inheritable, permitted);
-
- else if (pid < 0) /* all procs in process group */
- return cap_set_pg(-pid, effective, inheritable, permitted);
-
- /* target != current */
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
-
- target = find_task_by_vpid(pid);
- if (!target)
- ret = -ESRCH;
- else {
- ret = security_capset_check(target, effective, inheritable,
- permitted);
-
- /* having verified that the proposed changes are legal,
- we now put them into effect. */
- if (!ret)
- security_capset_set(target, effective, inheritable,
- permitted);
- }
-
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
-
- return ret;
-}
-
-#else /* ie., def CONFIG_SECURITY_FILE_CAPABILITIES */
-
-/*
- * If we have configured with filesystem capability support, then the
- * only thing that can change the capabilities of the current process
- * is the current process. As such, we can't be in this code at the
- * same time as we are in the process of setting capabilities in this
- * process. The net result is that we can limit our use of locks to
- * when we are reading the caps of another process.
+ * The only thing that can change the capabilities of the current
+ * process is the current process. As such, we can't be in this code
+ * at the same time as we are in the process of setting capabilities
+ * in this process. The net result is that we can limit our use of
+ * locks to when we are reading the caps of another process.
*/
static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
kernel_cap_t *pIp, kernel_cap_t *pPp)
@@ -285,7 +137,6 @@
if (pid && (pid != task_pid_vnr(current))) {
struct task_struct *target;
- spin_lock(&task_capability_lock);
read_lock(&tasklist_lock);
target = find_task_by_vpid(pid);
@@ -295,50 +146,12 @@
ret = security_capget(target, pEp, pIp, pPp);
read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
} else
ret = security_capget(current, pEp, pIp, pPp);
return ret;
}
-/*
- * With filesystem capability support configured, the kernel does not
- * permit the changing of capabilities in one process by another
- * process. (CAP_SETPCAP has much less broad semantics when configured
- * this way.)
- */
-static inline int do_sys_capset_other_tasks(pid_t pid,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
-{
- return -EPERM;
-}
-
-#endif /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
-
-/*
- * Atomically modify the effective capabilities returning the original
- * value. No permission check is performed here - it is assumed that the
- * caller is permitted to set the desired effective capabilities.
- */
-kernel_cap_t cap_set_effective(const kernel_cap_t pE_new)
-{
- kernel_cap_t pE_old;
-
- spin_lock(&task_capability_lock);
-
- pE_old = current->cap_effective;
- current->cap_effective = pE_new;
-
- spin_unlock(&task_capability_lock);
-
- return pE_old;
-}
-
-EXPORT_SYMBOL(cap_set_effective);
-
/**
* sys_capget - get the capabilities of a given process.
* @header: pointer to struct that contains capability version and
@@ -366,7 +179,6 @@
return -EINVAL;
ret = cap_get_target_pid(pid, &pE, &pI, &pP);
-
if (!ret) {
struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
unsigned i;
@@ -412,16 +224,14 @@
* @data: pointer to struct that contains the effective, permitted,
* and inheritable capabilities
*
- * Set capabilities for a given process, all processes, or all
- * processes in a given process group.
+ * Set capabilities for the current process only. The ability to any other
+ * process(es) has been deprecated and removed.
*
* The restrictions on setting capabilities are specified as:
*
- * [pid is for the 'target' task. 'current' is the calling task.]
- *
- * I: any raised capabilities must be a subset of the (old current) permitted
- * P: any raised capabilities must be a subset of the (old current) permitted
- * E: must be set to a subset of (new target) permitted
+ * I: any raised capabilities must be a subset of the old permitted
+ * P: any raised capabilities must be a subset of the old permitted
+ * E: must be set to a subset of new permitted
*
* Returns 0 on success and < 0 on error.
*/
@@ -430,6 +240,7 @@
struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
unsigned i, tocopy;
kernel_cap_t inheritable, permitted, effective;
+ struct cred *new;
int ret;
pid_t pid;
@@ -440,10 +251,13 @@
if (get_user(pid, &header->pid))
return -EFAULT;
- if (copy_from_user(&kdata, data, tocopy
- * sizeof(struct __user_cap_data_struct))) {
+ /* may only affect current now */
+ if (pid != 0 && pid != task_pid_vnr(current))
+ return -EPERM;
+
+ if (copy_from_user(&kdata, data,
+ tocopy * sizeof(struct __user_cap_data_struct)))
return -EFAULT;
- }
for (i = 0; i < tocopy; i++) {
effective.cap[i] = kdata[i].effective;
@@ -457,32 +271,23 @@
i++;
}
- if (pid && (pid != task_pid_vnr(current)))
- ret = do_sys_capset_other_tasks(pid, &effective, &inheritable,
- &permitted);
- else {
- /*
- * This lock is required even when filesystem
- * capability support is configured - it protects the
- * sys_capget() call from returning incorrect data in
- * the case that the targeted process is not the
- * current one.
- */
- spin_lock(&task_capability_lock);
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
- ret = security_capset_check(current, &effective, &inheritable,
- &permitted);
- /*
- * Having verified that the proposed changes are
- * legal, we now put them into effect.
- */
- if (!ret)
- security_capset_set(current, &effective, &inheritable,
- &permitted);
- spin_unlock(&task_capability_lock);
- }
+ ret = security_capset(new, current_cred(),
+ &effective, &inheritable, &permitted);
+ if (ret < 0)
+ goto error;
+ ret = audit_log_capset(pid, new, current_cred());
+ if (ret < 0)
+ return ret;
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
return ret;
}
@@ -498,6 +303,11 @@
*/
int capable(int cap)
{
+ if (unlikely(!cap_valid(cap))) {
+ printk(KERN_CRIT "capable() called with invalid cap=%u\n", cap);
+ BUG();
+ }
+
if (has_capability(current, cap)) {
current->flags |= PF_SUPERPRIV;
return 1;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 358e775..8fe8c0c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -571,8 +571,8 @@
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_mapping->backing_dev_info = &cgroup_backing_dev_info;
@@ -1279,6 +1279,7 @@
static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
{
struct task_struct *tsk;
+ const struct cred *cred = current_cred(), *tcred;
int ret;
if (pid) {
@@ -1288,14 +1289,16 @@
rcu_read_unlock();
return -ESRCH;
}
- get_task_struct(tsk);
- rcu_read_unlock();
- if ((current->euid) && (current->euid != tsk->uid)
- && (current->euid != tsk->suid)) {
- put_task_struct(tsk);
+ tcred = __task_cred(tsk);
+ if (cred->euid &&
+ cred->euid != tcred->uid &&
+ cred->euid != tcred->suid) {
+ rcu_read_unlock();
return -EACCES;
}
+ get_task_struct(tsk);
+ rcu_read_unlock();
} else {
tsk = current;
get_task_struct(tsk);
diff --git a/kernel/cred-internals.h b/kernel/cred-internals.h
new file mode 100644
index 0000000..2dc4fc2
--- /dev/null
+++ b/kernel/cred-internals.h
@@ -0,0 +1,21 @@
+/* Internal credentials stuff
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+/*
+ * user.c
+ */
+static inline void sched_switch_user(struct task_struct *p)
+{
+#ifdef CONFIG_USER_SCHED
+ sched_move_task(p);
+#endif /* CONFIG_USER_SCHED */
+}
+
diff --git a/kernel/cred.c b/kernel/cred.c
new file mode 100644
index 0000000..13697ca
--- /dev/null
+++ b/kernel/cred.c
@@ -0,0 +1,577 @@
+/* Task credentials management - see Documentation/credentials.txt
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/cred.h>
+#include <linux/sched.h>
+#include <linux/key.h>
+#include <linux/keyctl.h>
+#include <linux/init_task.h>
+#include <linux/security.h>
+#include <linux/cn_proc.h>
+#include "cred-internals.h"
+
+static struct kmem_cache *cred_jar;
+
+/*
+ * The common credentials for the initial task's thread group
+ */
+#ifdef CONFIG_KEYS
+static struct thread_group_cred init_tgcred = {
+ .usage = ATOMIC_INIT(2),
+ .tgid = 0,
+ .lock = SPIN_LOCK_UNLOCKED,
+};
+#endif
+
+/*
+ * The initial credentials for the initial task
+ */
+struct cred init_cred = {
+ .usage = ATOMIC_INIT(4),
+ .securebits = SECUREBITS_DEFAULT,
+ .cap_inheritable = CAP_INIT_INH_SET,
+ .cap_permitted = CAP_FULL_SET,
+ .cap_effective = CAP_INIT_EFF_SET,
+ .cap_bset = CAP_INIT_BSET,
+ .user = INIT_USER,
+ .group_info = &init_groups,
+#ifdef CONFIG_KEYS
+ .tgcred = &init_tgcred,
+#endif
+};
+
+/*
+ * Dispose of the shared task group credentials
+ */
+#ifdef CONFIG_KEYS
+static void release_tgcred_rcu(struct rcu_head *rcu)
+{
+ struct thread_group_cred *tgcred =
+ container_of(rcu, struct thread_group_cred, rcu);
+
+ BUG_ON(atomic_read(&tgcred->usage) != 0);
+
+ key_put(tgcred->session_keyring);
+ key_put(tgcred->process_keyring);
+ kfree(tgcred);
+}
+#endif
+
+/*
+ * Release a set of thread group credentials.
+ */
+static void release_tgcred(struct cred *cred)
+{
+#ifdef CONFIG_KEYS
+ struct thread_group_cred *tgcred = cred->tgcred;
+
+ if (atomic_dec_and_test(&tgcred->usage))
+ call_rcu(&tgcred->rcu, release_tgcred_rcu);
+#endif
+}
+
+/*
+ * The RCU callback to actually dispose of a set of credentials
+ */
+static void put_cred_rcu(struct rcu_head *rcu)
+{
+ struct cred *cred = container_of(rcu, struct cred, rcu);
+
+ if (atomic_read(&cred->usage) != 0)
+ panic("CRED: put_cred_rcu() sees %p with usage %d\n",
+ cred, atomic_read(&cred->usage));
+
+ security_cred_free(cred);
+ key_put(cred->thread_keyring);
+ key_put(cred->request_key_auth);
+ release_tgcred(cred);
+ put_group_info(cred->group_info);
+ free_uid(cred->user);
+ kmem_cache_free(cred_jar, cred);
+}
+
+/**
+ * __put_cred - Destroy a set of credentials
+ * @cred: The record to release
+ *
+ * Destroy a set of credentials on which no references remain.
+ */
+void __put_cred(struct cred *cred)
+{
+ BUG_ON(atomic_read(&cred->usage) != 0);
+
+ call_rcu(&cred->rcu, put_cred_rcu);
+}
+EXPORT_SYMBOL(__put_cred);
+
+/**
+ * prepare_creds - Prepare a new set of credentials for modification
+ *
+ * Prepare a new set of task credentials for modification. A task's creds
+ * shouldn't generally be modified directly, therefore this function is used to
+ * prepare a new copy, which the caller then modifies and then commits by
+ * calling commit_creds().
+ *
+ * Preparation involves making a copy of the objective creds for modification.
+ *
+ * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
+ *
+ * Call commit_creds() or abort_creds() to clean up.
+ */
+struct cred *prepare_creds(void)
+{
+ struct task_struct *task = current;
+ const struct cred *old;
+ struct cred *new;
+
+ BUG_ON(atomic_read(&task->real_cred->usage) < 1);
+
+ new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
+ if (!new)
+ return NULL;
+
+ old = task->cred;
+ memcpy(new, old, sizeof(struct cred));
+
+ atomic_set(&new->usage, 1);
+ get_group_info(new->group_info);
+ get_uid(new->user);
+
+#ifdef CONFIG_KEYS
+ key_get(new->thread_keyring);
+ key_get(new->request_key_auth);
+ atomic_inc(&new->tgcred->usage);
+#endif
+
+#ifdef CONFIG_SECURITY
+ new->security = NULL;
+#endif
+
+ if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+ goto error;
+ return new;
+
+error:
+ abort_creds(new);
+ return NULL;
+}
+EXPORT_SYMBOL(prepare_creds);
+
+/*
+ * Prepare credentials for current to perform an execve()
+ * - The caller must hold current->cred_exec_mutex
+ */
+struct cred *prepare_exec_creds(void)
+{
+ struct thread_group_cred *tgcred = NULL;
+ struct cred *new;
+
+#ifdef CONFIG_KEYS
+ tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
+ if (!tgcred)
+ return NULL;
+#endif
+
+ new = prepare_creds();
+ if (!new) {
+ kfree(tgcred);
+ return new;
+ }
+
+#ifdef CONFIG_KEYS
+ /* newly exec'd tasks don't get a thread keyring */
+ key_put(new->thread_keyring);
+ new->thread_keyring = NULL;
+
+ /* create a new per-thread-group creds for all this set of threads to
+ * share */
+ memcpy(tgcred, new->tgcred, sizeof(struct thread_group_cred));
+
+ atomic_set(&tgcred->usage, 1);
+ spin_lock_init(&tgcred->lock);
+
+ /* inherit the session keyring; new process keyring */
+ key_get(tgcred->session_keyring);
+ tgcred->process_keyring = NULL;
+
+ release_tgcred(new);
+ new->tgcred = tgcred;
+#endif
+
+ return new;
+}
+
+/*
+ * prepare new credentials for the usermode helper dispatcher
+ */
+struct cred *prepare_usermodehelper_creds(void)
+{
+#ifdef CONFIG_KEYS
+ struct thread_group_cred *tgcred = NULL;
+#endif
+ struct cred *new;
+
+#ifdef CONFIG_KEYS
+ tgcred = kzalloc(sizeof(*new->tgcred), GFP_ATOMIC);
+ if (!tgcred)
+ return NULL;
+#endif
+
+ new = kmem_cache_alloc(cred_jar, GFP_ATOMIC);
+ if (!new)
+ return NULL;
+
+ memcpy(new, &init_cred, sizeof(struct cred));
+
+ atomic_set(&new->usage, 1);
+ get_group_info(new->group_info);
+ get_uid(new->user);
+
+#ifdef CONFIG_KEYS
+ new->thread_keyring = NULL;
+ new->request_key_auth = NULL;
+ new->jit_keyring = KEY_REQKEY_DEFL_DEFAULT;
+
+ atomic_set(&tgcred->usage, 1);
+ spin_lock_init(&tgcred->lock);
+ new->tgcred = tgcred;
+#endif
+
+#ifdef CONFIG_SECURITY
+ new->security = NULL;
+#endif
+ if (security_prepare_creds(new, &init_cred, GFP_ATOMIC) < 0)
+ goto error;
+
+ BUG_ON(atomic_read(&new->usage) != 1);
+ return new;
+
+error:
+ put_cred(new);
+ return NULL;
+}
+
+/*
+ * Copy credentials for the new process created by fork()
+ *
+ * We share if we can, but under some circumstances we have to generate a new
+ * set.
+ *
+ * The new process gets the current process's subjective credentials as its
+ * objective and subjective credentials
+ */
+int copy_creds(struct task_struct *p, unsigned long clone_flags)
+{
+#ifdef CONFIG_KEYS
+ struct thread_group_cred *tgcred;
+#endif
+ struct cred *new;
+
+ mutex_init(&p->cred_exec_mutex);
+
+ if (
+#ifdef CONFIG_KEYS
+ !p->cred->thread_keyring &&
+#endif
+ clone_flags & CLONE_THREAD
+ ) {
+ p->real_cred = get_cred(p->cred);
+ get_cred(p->cred);
+ atomic_inc(&p->cred->user->processes);
+ return 0;
+ }
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+#ifdef CONFIG_KEYS
+ /* new threads get their own thread keyrings if their parent already
+ * had one */
+ if (new->thread_keyring) {
+ key_put(new->thread_keyring);
+ new->thread_keyring = NULL;
+ if (clone_flags & CLONE_THREAD)
+ install_thread_keyring_to_cred(new);
+ }
+
+ /* we share the process and session keyrings between all the threads in
+ * a process - this is slightly icky as we violate COW credentials a
+ * bit */
+ if (!(clone_flags & CLONE_THREAD)) {
+ tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
+ if (!tgcred) {
+ put_cred(new);
+ return -ENOMEM;
+ }
+ atomic_set(&tgcred->usage, 1);
+ spin_lock_init(&tgcred->lock);
+ tgcred->process_keyring = NULL;
+ tgcred->session_keyring = key_get(new->tgcred->session_keyring);
+
+ release_tgcred(new);
+ new->tgcred = tgcred;
+ }
+#endif
+
+ atomic_inc(&new->user->processes);
+ p->cred = p->real_cred = get_cred(new);
+ return 0;
+}
+
+/**
+ * commit_creds - Install new credentials upon the current task
+ * @new: The credentials to be assigned
+ *
+ * Install a new set of credentials to the current task, using RCU to replace
+ * the old set. Both the objective and the subjective credentials pointers are
+ * updated. This function may not be called if the subjective credentials are
+ * in an overridden state.
+ *
+ * This function eats the caller's reference to the new credentials.
+ *
+ * Always returns 0 thus allowing this function to be tail-called at the end
+ * of, say, sys_setgid().
+ */
+int commit_creds(struct cred *new)
+{
+ struct task_struct *task = current;
+ const struct cred *old;
+
+ BUG_ON(task->cred != task->real_cred);
+ BUG_ON(atomic_read(&task->real_cred->usage) < 2);
+ BUG_ON(atomic_read(&new->usage) < 1);
+
+ old = task->real_cred;
+ security_commit_creds(new, old);
+
+ get_cred(new); /* we will require a ref for the subj creds too */
+
+ /* dumpability changes */
+ if (old->euid != new->euid ||
+ old->egid != new->egid ||
+ old->fsuid != new->fsuid ||
+ old->fsgid != new->fsgid ||
+ !cap_issubset(new->cap_permitted, old->cap_permitted)) {
+ set_dumpable(task->mm, suid_dumpable);
+ task->pdeath_signal = 0;
+ smp_wmb();
+ }
+
+ /* alter the thread keyring */
+ if (new->fsuid != old->fsuid)
+ key_fsuid_changed(task);
+ if (new->fsgid != old->fsgid)
+ key_fsgid_changed(task);
+
+ /* do it
+ * - What if a process setreuid()'s and this brings the
+ * new uid over his NPROC rlimit? We can check this now
+ * cheaply with the new uid cache, so if it matters
+ * we should be checking for it. -DaveM
+ */
+ if (new->user != old->user)
+ atomic_inc(&new->user->processes);
+ rcu_assign_pointer(task->real_cred, new);
+ rcu_assign_pointer(task->cred, new);
+ if (new->user != old->user)
+ atomic_dec(&old->user->processes);
+
+ sched_switch_user(task);
+
+ /* send notifications */
+ if (new->uid != old->uid ||
+ new->euid != old->euid ||
+ new->suid != old->suid ||
+ new->fsuid != old->fsuid)
+ proc_id_connector(task, PROC_EVENT_UID);
+
+ if (new->gid != old->gid ||
+ new->egid != old->egid ||
+ new->sgid != old->sgid ||
+ new->fsgid != old->fsgid)
+ proc_id_connector(task, PROC_EVENT_GID);
+
+ /* release the old obj and subj refs both */
+ put_cred(old);
+ put_cred(old);
+ return 0;
+}
+EXPORT_SYMBOL(commit_creds);
+
+/**
+ * abort_creds - Discard a set of credentials and unlock the current task
+ * @new: The credentials that were going to be applied
+ *
+ * Discard a set of credentials that were under construction and unlock the
+ * current task.
+ */
+void abort_creds(struct cred *new)
+{
+ BUG_ON(atomic_read(&new->usage) < 1);
+ put_cred(new);
+}
+EXPORT_SYMBOL(abort_creds);
+
+/**
+ * override_creds - Override the current process's subjective credentials
+ * @new: The credentials to be assigned
+ *
+ * Install a set of temporary override subjective credentials on the current
+ * process, returning the old set for later reversion.
+ */
+const struct cred *override_creds(const struct cred *new)
+{
+ const struct cred *old = current->cred;
+
+ rcu_assign_pointer(current->cred, get_cred(new));
+ return old;
+}
+EXPORT_SYMBOL(override_creds);
+
+/**
+ * revert_creds - Revert a temporary subjective credentials override
+ * @old: The credentials to be restored
+ *
+ * Revert a temporary set of override subjective credentials to an old set,
+ * discarding the override set.
+ */
+void revert_creds(const struct cred *old)
+{
+ const struct cred *override = current->cred;
+
+ rcu_assign_pointer(current->cred, old);
+ put_cred(override);
+}
+EXPORT_SYMBOL(revert_creds);
+
+/*
+ * initialise the credentials stuff
+ */
+void __init cred_init(void)
+{
+ /* allocate a slab in which we can store credentials */
+ cred_jar = kmem_cache_create("cred_jar", sizeof(struct cred),
+ 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+}
+
+/**
+ * prepare_kernel_cred - Prepare a set of credentials for a kernel service
+ * @daemon: A userspace daemon to be used as a reference
+ *
+ * Prepare a set of credentials for a kernel service. This can then be used to
+ * override a task's own credentials so that work can be done on behalf of that
+ * task that requires a different subjective context.
+ *
+ * @daemon is used to provide a base for the security record, but can be NULL.
+ * If @daemon is supplied, then the security data will be derived from that;
+ * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
+ *
+ * The caller may change these controls afterwards if desired.
+ *
+ * Returns the new credentials or NULL if out of memory.
+ *
+ * Does not take, and does not return holding current->cred_replace_mutex.
+ */
+struct cred *prepare_kernel_cred(struct task_struct *daemon)
+{
+ const struct cred *old;
+ struct cred *new;
+
+ new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
+ if (!new)
+ return NULL;
+
+ if (daemon)
+ old = get_task_cred(daemon);
+ else
+ old = get_cred(&init_cred);
+
+ get_uid(new->user);
+ get_group_info(new->group_info);
+
+#ifdef CONFIG_KEYS
+ atomic_inc(&init_tgcred.usage);
+ new->tgcred = &init_tgcred;
+ new->request_key_auth = NULL;
+ new->thread_keyring = NULL;
+ new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
+#endif
+
+#ifdef CONFIG_SECURITY
+ new->security = NULL;
+#endif
+ if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+ goto error;
+
+ atomic_set(&new->usage, 1);
+ put_cred(old);
+ return new;
+
+error:
+ put_cred(new);
+ return NULL;
+}
+EXPORT_SYMBOL(prepare_kernel_cred);
+
+/**
+ * set_security_override - Set the security ID in a set of credentials
+ * @new: The credentials to alter
+ * @secid: The LSM security ID to set
+ *
+ * Set the LSM security ID in a set of credentials so that the subjective
+ * security is overridden when an alternative set of credentials is used.
+ */
+int set_security_override(struct cred *new, u32 secid)
+{
+ return security_kernel_act_as(new, secid);
+}
+EXPORT_SYMBOL(set_security_override);
+
+/**
+ * set_security_override_from_ctx - Set the security ID in a set of credentials
+ * @new: The credentials to alter
+ * @secctx: The LSM security context to generate the security ID from.
+ *
+ * Set the LSM security ID in a set of credentials so that the subjective
+ * security is overridden when an alternative set of credentials is used. The
+ * security ID is specified in string form as a security context to be
+ * interpreted by the LSM.
+ */
+int set_security_override_from_ctx(struct cred *new, const char *secctx)
+{
+ u32 secid;
+ int ret;
+
+ ret = security_secctx_to_secid(secctx, strlen(secctx), &secid);
+ if (ret < 0)
+ return ret;
+
+ return set_security_override(new, secid);
+}
+EXPORT_SYMBOL(set_security_override_from_ctx);
+
+/**
+ * set_create_files_as - Set the LSM file create context in a set of credentials
+ * @new: The credentials to alter
+ * @inode: The inode to take the context from
+ *
+ * Change the LSM file creation context in a set of credentials to be the same
+ * as the object context of the specified inode, so that the new inodes have
+ * the same MAC context as that inode.
+ */
+int set_create_files_as(struct cred *new, struct inode *inode)
+{
+ new->fsuid = inode->i_uid;
+ new->fsgid = inode->i_gid;
+ return security_kernel_create_files_as(new, inode);
+}
+EXPORT_SYMBOL(set_create_files_as);
diff --git a/kernel/exit.c b/kernel/exit.c
index ae2b92b..16eda9b 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -47,12 +47,14 @@
#include <linux/blkdev.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/tracehook.h>
+#include <linux/init_task.h>
#include <trace/sched.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
+#include "cred-internals.h"
static void exit_mm(struct task_struct * tsk);
@@ -165,7 +167,10 @@
int zap_leader;
repeat:
tracehook_prepare_release_task(p);
- atomic_dec(&p->user->processes);
+ /* don't need to get the RCU readlock here - the process is dead and
+ * can't be modifying its own credentials */
+ atomic_dec(&__task_cred(p)->user->processes);
+
proc_flush_task(p);
write_lock_irq(&tasklist_lock);
tracehook_finish_release_task(p);
@@ -340,12 +345,12 @@
/* cpus_allowed? */
/* rt_priority? */
/* signals? */
- security_task_reparent_to_init(current);
memcpy(current->signal->rlim, init_task.signal->rlim,
sizeof(current->signal->rlim));
- atomic_inc(&(INIT_USER->__count));
+
+ atomic_inc(&init_cred.usage);
+ commit_creds(&init_cred);
write_unlock_irq(&tasklist_lock);
- switch_uid(INIT_USER);
}
void __set_special_pids(struct pid *pid)
@@ -1087,7 +1092,6 @@
check_stack_usage();
exit_thread();
cgroup_exit(tsk, 1);
- exit_keys(tsk);
if (group_dead && tsk->signal->leader)
disassociate_ctty(1);
@@ -1272,12 +1276,12 @@
unsigned long state;
int retval, status, traced;
pid_t pid = task_pid_vnr(p);
+ uid_t uid = __task_cred(p)->uid;
if (!likely(options & WEXITED))
return 0;
if (unlikely(options & WNOWAIT)) {
- uid_t uid = p->uid;
int exit_code = p->exit_code;
int why, status;
@@ -1398,7 +1402,7 @@
if (!retval && infop)
retval = put_user(pid, &infop->si_pid);
if (!retval && infop)
- retval = put_user(p->uid, &infop->si_uid);
+ retval = put_user(uid, &infop->si_uid);
if (!retval)
retval = pid;
@@ -1463,7 +1467,8 @@
if (!unlikely(options & WNOWAIT))
p->exit_code = 0;
- uid = p->uid;
+ /* don't need the RCU readlock here as we're holding a spinlock */
+ uid = __task_cred(p)->uid;
unlock_sig:
spin_unlock_irq(&p->sighand->siglock);
if (!exit_code)
@@ -1537,10 +1542,10 @@
}
if (!unlikely(options & WNOWAIT))
p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
+ uid = __task_cred(p)->uid;
spin_unlock_irq(&p->sighand->siglock);
pid = task_pid_vnr(p);
- uid = p->uid;
get_task_struct(p);
read_unlock(&tasklist_lock);
diff --git a/kernel/fork.c b/kernel/fork.c
index f608356..af0d0f0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -146,9 +146,8 @@
WARN_ON(atomic_read(&tsk->usage));
WARN_ON(tsk == current);
- security_task_free(tsk);
- free_uid(tsk->user);
- put_group_info(tsk->group_info);
+ put_cred(tsk->real_cred);
+ put_cred(tsk->cred);
delayacct_tsk_free(tsk);
if (!profile_handoff_task(tsk))
@@ -804,12 +803,6 @@
if (!sig)
return -ENOMEM;
- ret = copy_thread_group_keys(tsk);
- if (ret < 0) {
- kmem_cache_free(signal_cachep, sig);
- return ret;
- }
-
atomic_set(&sig->count, 1);
atomic_set(&sig->live, 1);
init_waitqueue_head(&sig->wait_chldexit);
@@ -854,7 +847,6 @@
void __cleanup_signal(struct signal_struct *sig)
{
thread_group_cputime_free(sig);
- exit_thread_group_keys(sig);
tty_kref_put(sig->tty);
kmem_cache_free(signal_cachep, sig);
}
@@ -970,16 +962,16 @@
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
#endif
retval = -EAGAIN;
- if (atomic_read(&p->user->processes) >=
+ if (atomic_read(&p->real_cred->user->processes) >=
p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
- p->user != current->nsproxy->user_ns->root_user)
+ p->real_cred->user != current->nsproxy->user_ns->root_user)
goto bad_fork_free;
}
- atomic_inc(&p->user->__count);
- atomic_inc(&p->user->processes);
- get_group_info(p->group_info);
+ retval = copy_creds(p, clone_flags);
+ if (retval < 0)
+ goto bad_fork_free;
/*
* If multiple threads are within copy_process(), then this check
@@ -1034,10 +1026,6 @@
do_posix_clock_monotonic_gettime(&p->start_time);
p->real_start_time = p->start_time;
monotonic_to_bootbased(&p->real_start_time);
-#ifdef CONFIG_SECURITY
- p->security = NULL;
-#endif
- p->cap_bset = current->cap_bset;
p->io_context = NULL;
p->audit_context = NULL;
cgroup_fork(p);
@@ -1082,10 +1070,8 @@
/* Perform scheduler related setup. Assign this task to a CPU. */
sched_fork(p, clone_flags);
- if ((retval = security_task_alloc(p)))
- goto bad_fork_cleanup_policy;
if ((retval = audit_alloc(p)))
- goto bad_fork_cleanup_security;
+ goto bad_fork_cleanup_policy;
/* copy all the process information */
if ((retval = copy_semundo(clone_flags, p)))
goto bad_fork_cleanup_audit;
@@ -1099,10 +1085,8 @@
goto bad_fork_cleanup_sighand;
if ((retval = copy_mm(clone_flags, p)))
goto bad_fork_cleanup_signal;
- if ((retval = copy_keys(clone_flags, p)))
- goto bad_fork_cleanup_mm;
if ((retval = copy_namespaces(clone_flags, p)))
- goto bad_fork_cleanup_keys;
+ goto bad_fork_cleanup_mm;
if ((retval = copy_io(clone_flags, p)))
goto bad_fork_cleanup_namespaces;
retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
@@ -1267,8 +1251,6 @@
put_io_context(p->io_context);
bad_fork_cleanup_namespaces:
exit_task_namespaces(p);
-bad_fork_cleanup_keys:
- exit_keys(p);
bad_fork_cleanup_mm:
if (p->mm)
mmput(p->mm);
@@ -1284,8 +1266,6 @@
exit_sem(p);
bad_fork_cleanup_audit:
audit_free(p);
-bad_fork_cleanup_security:
- security_task_free(p);
bad_fork_cleanup_policy:
#ifdef CONFIG_NUMA
mpol_put(p->mempolicy);
@@ -1298,9 +1278,9 @@
bad_fork_cleanup_put_domain:
module_put(task_thread_info(p)->exec_domain->module);
bad_fork_cleanup_count:
- put_group_info(p->group_info);
- atomic_dec(&p->user->processes);
- free_uid(p->user);
+ atomic_dec(&p->cred->user->processes);
+ put_cred(p->real_cred);
+ put_cred(p->cred);
bad_fork_free:
free_task(p);
fork_out:
diff --git a/kernel/futex.c b/kernel/futex.c
index 8af1002..4fe790e 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -439,13 +439,20 @@
static struct task_struct * futex_find_get_task(pid_t pid)
{
struct task_struct *p;
+ const struct cred *cred = current_cred(), *pcred;
rcu_read_lock();
p = find_task_by_vpid(pid);
- if (!p || ((current->euid != p->euid) && (current->euid != p->uid)))
+ if (!p) {
p = ERR_PTR(-ESRCH);
- else
- get_task_struct(p);
+ } else {
+ pcred = __task_cred(p);
+ if (cred->euid != pcred->euid &&
+ cred->euid != pcred->uid)
+ p = ERR_PTR(-ESRCH);
+ else
+ get_task_struct(p);
+ }
rcu_read_unlock();
@@ -1829,6 +1836,7 @@
{
struct robust_list_head __user *head;
unsigned long ret;
+ const struct cred *cred = current_cred(), *pcred;
if (!futex_cmpxchg_enabled)
return -ENOSYS;
@@ -1844,8 +1852,10 @@
if (!p)
goto err_unlock;
ret = -EPERM;
- if ((current->euid != p->euid) && (current->euid != p->uid) &&
- !capable(CAP_SYS_PTRACE))
+ pcred = __task_cred(p);
+ if (cred->euid != pcred->euid &&
+ cred->euid != pcred->uid &&
+ !capable(CAP_SYS_PTRACE))
goto err_unlock;
head = p->robust_list;
rcu_read_unlock();
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 04ac3a9..d607a5b 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -135,6 +135,7 @@
{
struct compat_robust_list_head __user *head;
unsigned long ret;
+ const struct cred *cred = current_cred(), *pcred;
if (!futex_cmpxchg_enabled)
return -ENOSYS;
@@ -150,8 +151,10 @@
if (!p)
goto err_unlock;
ret = -EPERM;
- if ((current->euid != p->euid) && (current->euid != p->uid) &&
- !capable(CAP_SYS_PTRACE))
+ pcred = __task_cred(p);
+ if (cred->euid != pcred->euid &&
+ cred->euid != pcred->uid &&
+ !capable(CAP_SYS_PTRACE))
goto err_unlock;
head = p->compat_robust_list;
read_unlock(&tasklist_lock);
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 3d3c3ea..b46dbb9 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -118,10 +118,10 @@
struct subprocess_info {
struct work_struct work;
struct completion *complete;
+ struct cred *cred;
char *path;
char **argv;
char **envp;
- struct key *ring;
enum umh_wait wait;
int retval;
struct file *stdin;
@@ -134,19 +134,20 @@
static int ____call_usermodehelper(void *data)
{
struct subprocess_info *sub_info = data;
- struct key *new_session, *old_session;
int retval;
- /* Unblock all signals and set the session keyring. */
- new_session = key_get(sub_info->ring);
+ BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
+ /* Unblock all signals */
spin_lock_irq(¤t->sighand->siglock);
- old_session = __install_session_keyring(current, new_session);
flush_signal_handlers(current, 1);
sigemptyset(¤t->blocked);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- key_put(old_session);
+ /* Install the credentials */
+ commit_creds(sub_info->cred);
+ sub_info->cred = NULL;
/* Install input pipe when needed */
if (sub_info->stdin) {
@@ -185,6 +186,8 @@
{
if (info->cleanup)
(*info->cleanup)(info->argv, info->envp);
+ if (info->cred)
+ put_cred(info->cred);
kfree(info);
}
EXPORT_SYMBOL(call_usermodehelper_freeinfo);
@@ -240,6 +243,8 @@
pid_t pid;
enum umh_wait wait = sub_info->wait;
+ BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
/* CLONE_VFORK: wait until the usermode helper has execve'd
* successfully We need the data structures to stay around
* until that is done. */
@@ -362,6 +367,9 @@
sub_info->path = path;
sub_info->argv = argv;
sub_info->envp = envp;
+ sub_info->cred = prepare_usermodehelper_creds();
+ if (!sub_info->cred)
+ return NULL;
out:
return sub_info;
@@ -376,7 +384,13 @@
void call_usermodehelper_setkeys(struct subprocess_info *info,
struct key *session_keyring)
{
- info->ring = session_keyring;
+#ifdef CONFIG_KEYS
+ struct thread_group_cred *tgcred = info->cred->tgcred;
+ key_put(tgcred->session_keyring);
+ tgcred->session_keyring = key_get(session_keyring);
+#else
+ BUG();
+#endif
}
EXPORT_SYMBOL(call_usermodehelper_setkeys);
@@ -444,6 +458,8 @@
DECLARE_COMPLETION_ONSTACK(done);
int retval = 0;
+ BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
helper_lock();
if (sub_info->path[0] == '\0')
goto out;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1e68e4c..f764b88 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -115,6 +115,8 @@
int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
+ const struct cred *cred = current_cred(), *tcred;
+
/* May we inspect the given task?
* This check is used both for attaching with ptrace
* and for allowing access to sensitive information in /proc.
@@ -127,13 +129,19 @@
/* Don't let security modules deny introspection */
if (task == current)
return 0;
- if (((current->uid != task->euid) ||
- (current->uid != task->suid) ||
- (current->uid != task->uid) ||
- (current->gid != task->egid) ||
- (current->gid != task->sgid) ||
- (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
+ rcu_read_lock();
+ tcred = __task_cred(task);
+ if ((cred->uid != tcred->euid ||
+ cred->uid != tcred->suid ||
+ cred->uid != tcred->uid ||
+ cred->gid != tcred->egid ||
+ cred->gid != tcred->sgid ||
+ cred->gid != tcred->gid) &&
+ !capable(CAP_SYS_PTRACE)) {
+ rcu_read_unlock();
return -EPERM;
+ }
+ rcu_read_unlock();
smp_rmb();
if (task->mm)
dumpable = get_dumpable(task->mm);
@@ -163,6 +171,14 @@
if (same_thread_group(task, current))
goto out;
+ /* Protect exec's credential calculations against our interference;
+ * SUID, SGID and LSM creds get determined differently under ptrace.
+ */
+ retval = mutex_lock_interruptible(¤t->cred_exec_mutex);
+ if (retval < 0)
+ goto out;
+
+ retval = -EPERM;
repeat:
/*
* Nasty, nasty.
@@ -202,6 +218,7 @@
bad:
write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task);
+ mutex_unlock(¤t->cred_exec_mutex);
out:
return retval;
}
diff --git a/kernel/sched.c b/kernel/sched.c
index c94baf2..204d066 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -345,7 +345,9 @@
struct task_group *tg;
#ifdef CONFIG_USER_SCHED
- tg = p->user->tg;
+ rcu_read_lock();
+ tg = __task_cred(p)->user->tg;
+ rcu_read_unlock();
#elif defined(CONFIG_CGROUP_SCHED)
tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
struct task_group, css);
@@ -5133,6 +5135,22 @@
set_load_weight(p);
}
+/*
+ * check the target process has a UID that matches the current process's
+ */
+static bool check_same_owner(struct task_struct *p)
+{
+ const struct cred *cred = current_cred(), *pcred;
+ bool match;
+
+ rcu_read_lock();
+ pcred = __task_cred(p);
+ match = (cred->euid == pcred->euid ||
+ cred->euid == pcred->uid);
+ rcu_read_unlock();
+ return match;
+}
+
static int __sched_setscheduler(struct task_struct *p, int policy,
struct sched_param *param, bool user)
{
@@ -5192,8 +5210,7 @@
return -EPERM;
/* can't change other user's priorities */
- if ((current->euid != p->euid) &&
- (current->euid != p->uid))
+ if (!check_same_owner(p))
return -EPERM;
}
@@ -5425,8 +5442,7 @@
read_unlock(&tasklist_lock);
retval = -EPERM;
- if ((current->euid != p->euid) && (current->euid != p->uid) &&
- !capable(CAP_SYS_NICE))
+ if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
goto out_unlock;
retval = security_task_setscheduler(p, 0, NULL);
diff --git a/kernel/signal.c b/kernel/signal.c
index 4530fc6..2a64304 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -177,6 +177,11 @@
return sig;
}
+/*
+ * allocate a new signal queue record
+ * - this may be called without locks if and only if t == current, otherwise an
+ * appopriate lock must be held to stop the target task from exiting
+ */
static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
int override_rlimit)
{
@@ -184,11 +189,12 @@
struct user_struct *user;
/*
- * In order to avoid problems with "switch_user()", we want to make
- * sure that the compiler doesn't re-load "t->user"
+ * We won't get problems with the target's UID changing under us
+ * because changing it requires RCU be used, and if t != current, the
+ * caller must be holding the RCU readlock (by way of a spinlock) and
+ * we use RCU protection here
*/
- user = t->user;
- barrier();
+ user = get_uid(__task_cred(t)->user);
atomic_inc(&user->sigpending);
if (override_rlimit ||
atomic_read(&user->sigpending) <=
@@ -196,12 +202,14 @@
q = kmem_cache_alloc(sigqueue_cachep, flags);
if (unlikely(q == NULL)) {
atomic_dec(&user->sigpending);
+ free_uid(user);
} else {
INIT_LIST_HEAD(&q->list);
q->flags = 0;
- q->user = get_uid(user);
+ q->user = user;
}
- return(q);
+
+ return q;
}
static void __sigqueue_free(struct sigqueue *q)
@@ -562,10 +570,12 @@
/*
* Bad permissions for sending the signal
+ * - the caller must hold at least the RCU read lock
*/
static int check_kill_permission(int sig, struct siginfo *info,
struct task_struct *t)
{
+ const struct cred *cred = current_cred(), *tcred;
struct pid *sid;
int error;
@@ -579,8 +589,11 @@
if (error)
return error;
- if ((current->euid ^ t->suid) && (current->euid ^ t->uid) &&
- (current->uid ^ t->suid) && (current->uid ^ t->uid) &&
+ tcred = __task_cred(t);
+ if ((cred->euid ^ tcred->suid) &&
+ (cred->euid ^ tcred->uid) &&
+ (cred->uid ^ tcred->suid) &&
+ (cred->uid ^ tcred->uid) &&
!capable(CAP_KILL)) {
switch (sig) {
case SIGCONT:
@@ -844,7 +857,7 @@
q->info.si_errno = 0;
q->info.si_code = SI_USER;
q->info.si_pid = task_pid_vnr(current);
- q->info.si_uid = current->uid;
+ q->info.si_uid = current_uid();
break;
case (unsigned long) SEND_SIG_PRIV:
q->info.si_signo = sig;
@@ -1008,6 +1021,10 @@
return sighand;
}
+/*
+ * send signal info to all the members of a group
+ * - the caller must hold the RCU read lock at least
+ */
int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
{
unsigned long flags;
@@ -1029,8 +1046,8 @@
/*
* __kill_pgrp_info() sends a signal to a process group: this is what the tty
* control characters do (^C, ^Z etc)
+ * - the caller must hold at least a readlock on tasklist_lock
*/
-
int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
{
struct task_struct *p = NULL;
@@ -1086,6 +1103,7 @@
{
int ret = -EINVAL;
struct task_struct *p;
+ const struct cred *pcred;
if (!valid_signal(sig))
return ret;
@@ -1096,9 +1114,11 @@
ret = -ESRCH;
goto out_unlock;
}
- if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
- && (euid != p->suid) && (euid != p->uid)
- && (uid != p->suid) && (uid != p->uid)) {
+ pcred = __task_cred(p);
+ if ((info == SEND_SIG_NOINFO ||
+ (!is_si_special(info) && SI_FROMUSER(info))) &&
+ euid != pcred->suid && euid != pcred->uid &&
+ uid != pcred->suid && uid != pcred->uid) {
ret = -EPERM;
goto out_unlock;
}
@@ -1369,10 +1389,9 @@
*/
rcu_read_lock();
info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+ info.si_uid = __task_cred(tsk)->uid;
rcu_read_unlock();
- info.si_uid = tsk->uid;
-
thread_group_cputime(tsk, &cputime);
info.si_utime = cputime_to_jiffies(cputime.utime);
info.si_stime = cputime_to_jiffies(cputime.stime);
@@ -1440,10 +1459,9 @@
*/
rcu_read_lock();
info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+ info.si_uid = __task_cred(tsk)->uid;
rcu_read_unlock();
- info.si_uid = tsk->uid;
-
info.si_utime = cputime_to_clock_t(tsk->utime);
info.si_stime = cputime_to_clock_t(tsk->stime);
@@ -1598,7 +1616,7 @@
info.si_signo = SIGTRAP;
info.si_code = exit_code;
info.si_pid = task_pid_vnr(current);
- info.si_uid = current->uid;
+ info.si_uid = current_uid();
/* Let the debugger run. */
spin_lock_irq(¤t->sighand->siglock);
@@ -1710,7 +1728,7 @@
info->si_errno = 0;
info->si_code = SI_USER;
info->si_pid = task_pid_vnr(current->parent);
- info->si_uid = current->parent->uid;
+ info->si_uid = task_uid(current->parent);
}
/* If the (new) signal is now blocked, requeue it. */
@@ -2211,7 +2229,7 @@
info.si_errno = 0;
info.si_code = SI_USER;
info.si_pid = task_tgid_vnr(current);
- info.si_uid = current->uid;
+ info.si_uid = current_uid();
return kill_something_info(sig, &info, pid);
}
@@ -2228,7 +2246,7 @@
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = task_tgid_vnr(current);
- info.si_uid = current->uid;
+ info.si_uid = current_uid();
rcu_read_lock();
p = find_task_by_vpid(pid);
diff --git a/kernel/sys.c b/kernel/sys.c
index 31deba8..ab73504 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -112,12 +112,17 @@
void (*pm_power_off_prepare)(void);
+/*
+ * set the priority of a task
+ * - the caller must hold the RCU read lock
+ */
static int set_one_prio(struct task_struct *p, int niceval, int error)
{
+ const struct cred *cred = current_cred(), *pcred = __task_cred(p);
int no_nice;
- if (p->uid != current->euid &&
- p->euid != current->euid && !capable(CAP_SYS_NICE)) {
+ if (pcred->uid != cred->euid &&
+ pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) {
error = -EPERM;
goto out;
}
@@ -141,6 +146,7 @@
{
struct task_struct *g, *p;
struct user_struct *user;
+ const struct cred *cred = current_cred();
int error = -EINVAL;
struct pid *pgrp;
@@ -174,18 +180,18 @@
} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
- user = current->user;
+ user = (struct user_struct *) cred->user;
if (!who)
- who = current->uid;
- else
- if ((who != current->uid) && !(user = find_user(who)))
- goto out_unlock; /* No processes for this user */
+ who = cred->uid;
+ else if ((who != cred->uid) &&
+ !(user = find_user(who)))
+ goto out_unlock; /* No processes for this user */
do_each_thread(g, p)
- if (p->uid == who)
+ if (__task_cred(p)->uid == who)
error = set_one_prio(p, niceval, error);
while_each_thread(g, p);
- if (who != current->uid)
+ if (who != cred->uid)
free_uid(user); /* For find_user() */
break;
}
@@ -205,6 +211,7 @@
{
struct task_struct *g, *p;
struct user_struct *user;
+ const struct cred *cred = current_cred();
long niceval, retval = -ESRCH;
struct pid *pgrp;
@@ -236,21 +243,21 @@
} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
- user = current->user;
+ user = (struct user_struct *) cred->user;
if (!who)
- who = current->uid;
- else
- if ((who != current->uid) && !(user = find_user(who)))
- goto out_unlock; /* No processes for this user */
+ who = cred->uid;
+ else if ((who != cred->uid) &&
+ !(user = find_user(who)))
+ goto out_unlock; /* No processes for this user */
do_each_thread(g, p)
- if (p->uid == who) {
+ if (__task_cred(p)->uid == who) {
niceval = 20 - task_nice(p);
if (niceval > retval)
retval = niceval;
}
while_each_thread(g, p);
- if (who != current->uid)
+ if (who != cred->uid)
free_uid(user); /* for find_user() */
break;
}
@@ -472,46 +479,48 @@
*/
asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
{
- int old_rgid = current->gid;
- int old_egid = current->egid;
- int new_rgid = old_rgid;
- int new_egid = old_egid;
+ const struct cred *old;
+ struct cred *new;
int retval;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE);
if (retval)
- return retval;
+ goto error;
+ retval = -EPERM;
if (rgid != (gid_t) -1) {
- if ((old_rgid == rgid) ||
- (current->egid==rgid) ||
+ if (old->gid == rgid ||
+ old->egid == rgid ||
capable(CAP_SETGID))
- new_rgid = rgid;
+ new->gid = rgid;
else
- return -EPERM;
+ goto error;
}
if (egid != (gid_t) -1) {
- if ((old_rgid == egid) ||
- (current->egid == egid) ||
- (current->sgid == egid) ||
+ if (old->gid == egid ||
+ old->egid == egid ||
+ old->sgid == egid ||
capable(CAP_SETGID))
- new_egid = egid;
+ new->egid = egid;
else
- return -EPERM;
+ goto error;
}
- if (new_egid != old_egid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
+
if (rgid != (gid_t) -1 ||
- (egid != (gid_t) -1 && egid != old_rgid))
- current->sgid = new_egid;
- current->fsgid = new_egid;
- current->egid = new_egid;
- current->gid = new_rgid;
- key_fsgid_changed(current);
- proc_id_connector(current, PROC_EVENT_GID);
- return 0;
+ (egid != (gid_t) -1 && egid != old->gid))
+ new->sgid = new->egid;
+ new->fsgid = new->egid;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
}
/*
@@ -521,39 +530,42 @@
*/
asmlinkage long sys_setgid(gid_t gid)
{
- int old_egid = current->egid;
+ const struct cred *old;
+ struct cred *new;
int retval;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID);
if (retval)
- return retval;
+ goto error;
- if (capable(CAP_SETGID)) {
- if (old_egid != gid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
- current->gid = current->egid = current->sgid = current->fsgid = gid;
- } else if ((gid == current->gid) || (gid == current->sgid)) {
- if (old_egid != gid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
- current->egid = current->fsgid = gid;
- }
+ retval = -EPERM;
+ if (capable(CAP_SETGID))
+ new->gid = new->egid = new->sgid = new->fsgid = gid;
+ else if (gid == old->gid || gid == old->sgid)
+ new->egid = new->fsgid = gid;
else
- return -EPERM;
+ goto error;
- key_fsgid_changed(current);
- proc_id_connector(current, PROC_EVENT_GID);
- return 0;
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
}
-static int set_user(uid_t new_ruid, int dumpclear)
+/*
+ * change the user struct in a credentials set to match the new UID
+ */
+static int set_user(struct cred *new)
{
struct user_struct *new_user;
- new_user = alloc_uid(current->nsproxy->user_ns, new_ruid);
+ new_user = alloc_uid(current->nsproxy->user_ns, new->uid);
if (!new_user)
return -EAGAIN;
@@ -564,13 +576,8 @@
return -EAGAIN;
}
- switch_uid(new_user);
-
- if (dumpclear) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
- current->uid = new_ruid;
+ free_uid(new->user);
+ new->user = new_user;
return 0;
}
@@ -591,54 +598,56 @@
*/
asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
{
- int old_ruid, old_euid, old_suid, new_ruid, new_euid;
+ const struct cred *old;
+ struct cred *new;
int retval;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE);
if (retval)
- return retval;
+ goto error;
- new_ruid = old_ruid = current->uid;
- new_euid = old_euid = current->euid;
- old_suid = current->suid;
-
+ retval = -EPERM;
if (ruid != (uid_t) -1) {
- new_ruid = ruid;
- if ((old_ruid != ruid) &&
- (current->euid != ruid) &&
+ new->uid = ruid;
+ if (old->uid != ruid &&
+ old->euid != ruid &&
!capable(CAP_SETUID))
- return -EPERM;
+ goto error;
}
if (euid != (uid_t) -1) {
- new_euid = euid;
- if ((old_ruid != euid) &&
- (current->euid != euid) &&
- (current->suid != euid) &&
+ new->euid = euid;
+ if (old->uid != euid &&
+ old->euid != euid &&
+ old->suid != euid &&
!capable(CAP_SETUID))
- return -EPERM;
+ goto error;
}
- if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0)
- return -EAGAIN;
+ retval = -EAGAIN;
+ if (new->uid != old->uid && set_user(new) < 0)
+ goto error;
- if (new_euid != old_euid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
- current->fsuid = current->euid = new_euid;
if (ruid != (uid_t) -1 ||
- (euid != (uid_t) -1 && euid != old_ruid))
- current->suid = current->euid;
- current->fsuid = current->euid;
+ (euid != (uid_t) -1 && euid != old->uid))
+ new->suid = new->euid;
+ new->fsuid = new->euid;
- key_fsuid_changed(current);
- proc_id_connector(current, PROC_EVENT_UID);
+ retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
+ if (retval < 0)
+ goto error;
- return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE);
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
}
-
-
/*
* setuid() is implemented like SysV with SAVED_IDS
@@ -653,36 +662,41 @@
*/
asmlinkage long sys_setuid(uid_t uid)
{
- int old_euid = current->euid;
- int old_ruid, old_suid, new_suid;
+ const struct cred *old;
+ struct cred *new;
int retval;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID);
if (retval)
- return retval;
+ goto error;
- old_ruid = current->uid;
- old_suid = current->suid;
- new_suid = old_suid;
-
+ retval = -EPERM;
if (capable(CAP_SETUID)) {
- if (uid != old_ruid && set_user(uid, old_euid != uid) < 0)
- return -EAGAIN;
- new_suid = uid;
- } else if ((uid != current->uid) && (uid != new_suid))
- return -EPERM;
-
- if (old_euid != uid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
+ new->suid = new->uid = uid;
+ if (uid != old->uid && set_user(new) < 0) {
+ retval = -EAGAIN;
+ goto error;
+ }
+ } else if (uid != old->uid && uid != new->suid) {
+ goto error;
}
- current->fsuid = current->euid = uid;
- current->suid = new_suid;
- key_fsuid_changed(current);
- proc_id_connector(current, PROC_EVENT_UID);
+ new->fsuid = new->euid = uid;
- return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID);
+ retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
+ if (retval < 0)
+ goto error;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
}
@@ -692,54 +706,63 @@
*/
asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
{
- int old_ruid = current->uid;
- int old_euid = current->euid;
- int old_suid = current->suid;
+ const struct cred *old;
+ struct cred *new;
int retval;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES);
if (retval)
- return retval;
+ goto error;
+ old = current_cred();
+ retval = -EPERM;
if (!capable(CAP_SETUID)) {
- if ((ruid != (uid_t) -1) && (ruid != current->uid) &&
- (ruid != current->euid) && (ruid != current->suid))
- return -EPERM;
- if ((euid != (uid_t) -1) && (euid != current->uid) &&
- (euid != current->euid) && (euid != current->suid))
- return -EPERM;
- if ((suid != (uid_t) -1) && (suid != current->uid) &&
- (suid != current->euid) && (suid != current->suid))
- return -EPERM;
+ if (ruid != (uid_t) -1 && ruid != old->uid &&
+ ruid != old->euid && ruid != old->suid)
+ goto error;
+ if (euid != (uid_t) -1 && euid != old->uid &&
+ euid != old->euid && euid != old->suid)
+ goto error;
+ if (suid != (uid_t) -1 && suid != old->uid &&
+ suid != old->euid && suid != old->suid)
+ goto error;
}
+
+ retval = -EAGAIN;
if (ruid != (uid_t) -1) {
- if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0)
- return -EAGAIN;
+ new->uid = ruid;
+ if (ruid != old->uid && set_user(new) < 0)
+ goto error;
}
- if (euid != (uid_t) -1) {
- if (euid != current->euid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
- current->euid = euid;
- }
- current->fsuid = current->euid;
+ if (euid != (uid_t) -1)
+ new->euid = euid;
if (suid != (uid_t) -1)
- current->suid = suid;
+ new->suid = suid;
+ new->fsuid = new->euid;
- key_fsuid_changed(current);
- proc_id_connector(current, PROC_EVENT_UID);
+ retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
+ if (retval < 0)
+ goto error;
- return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES);
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
}
asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid)
{
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(current->uid, ruid)) &&
- !(retval = put_user(current->euid, euid)))
- retval = put_user(current->suid, suid);
+ if (!(retval = put_user(cred->uid, ruid)) &&
+ !(retval = put_user(cred->euid, euid)))
+ retval = put_user(cred->suid, suid);
return retval;
}
@@ -749,48 +772,55 @@
*/
asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
{
+ const struct cred *old;
+ struct cred *new;
int retval;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES);
if (retval)
- return retval;
+ goto error;
+ retval = -EPERM;
if (!capable(CAP_SETGID)) {
- if ((rgid != (gid_t) -1) && (rgid != current->gid) &&
- (rgid != current->egid) && (rgid != current->sgid))
- return -EPERM;
- if ((egid != (gid_t) -1) && (egid != current->gid) &&
- (egid != current->egid) && (egid != current->sgid))
- return -EPERM;
- if ((sgid != (gid_t) -1) && (sgid != current->gid) &&
- (sgid != current->egid) && (sgid != current->sgid))
- return -EPERM;
+ if (rgid != (gid_t) -1 && rgid != old->gid &&
+ rgid != old->egid && rgid != old->sgid)
+ goto error;
+ if (egid != (gid_t) -1 && egid != old->gid &&
+ egid != old->egid && egid != old->sgid)
+ goto error;
+ if (sgid != (gid_t) -1 && sgid != old->gid &&
+ sgid != old->egid && sgid != old->sgid)
+ goto error;
}
- if (egid != (gid_t) -1) {
- if (egid != current->egid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
- }
- current->egid = egid;
- }
- current->fsgid = current->egid;
- if (rgid != (gid_t) -1)
- current->gid = rgid;
- if (sgid != (gid_t) -1)
- current->sgid = sgid;
- key_fsgid_changed(current);
- proc_id_connector(current, PROC_EVENT_GID);
- return 0;
+ if (rgid != (gid_t) -1)
+ new->gid = rgid;
+ if (egid != (gid_t) -1)
+ new->egid = egid;
+ if (sgid != (gid_t) -1)
+ new->sgid = sgid;
+ new->fsgid = new->egid;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
}
asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid)
{
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(current->gid, rgid)) &&
- !(retval = put_user(current->egid, egid)))
- retval = put_user(current->sgid, sgid);
+ if (!(retval = put_user(cred->gid, rgid)) &&
+ !(retval = put_user(cred->egid, egid)))
+ retval = put_user(cred->sgid, sgid);
return retval;
}
@@ -804,27 +834,35 @@
*/
asmlinkage long sys_setfsuid(uid_t uid)
{
- int old_fsuid;
+ const struct cred *old;
+ struct cred *new;
+ uid_t old_fsuid;
- old_fsuid = current->fsuid;
- if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS))
- return old_fsuid;
+ new = prepare_creds();
+ if (!new)
+ return current_fsuid();
+ old = current_cred();
+ old_fsuid = old->fsuid;
- if (uid == current->uid || uid == current->euid ||
- uid == current->suid || uid == current->fsuid ||
+ if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0)
+ goto error;
+
+ if (uid == old->uid || uid == old->euid ||
+ uid == old->suid || uid == old->fsuid ||
capable(CAP_SETUID)) {
if (uid != old_fsuid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
+ new->fsuid = uid;
+ if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
+ goto change_okay;
}
- current->fsuid = uid;
}
- key_fsuid_changed(current);
- proc_id_connector(current, PROC_EVENT_UID);
+error:
+ abort_creds(new);
+ return old_fsuid;
- security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
-
+change_okay:
+ commit_creds(new);
return old_fsuid;
}
@@ -833,23 +871,34 @@
*/
asmlinkage long sys_setfsgid(gid_t gid)
{
- int old_fsgid;
+ const struct cred *old;
+ struct cred *new;
+ gid_t old_fsgid;
- old_fsgid = current->fsgid;
+ new = prepare_creds();
+ if (!new)
+ return current_fsgid();
+ old = current_cred();
+ old_fsgid = old->fsgid;
+
if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS))
- return old_fsgid;
+ goto error;
- if (gid == current->gid || gid == current->egid ||
- gid == current->sgid || gid == current->fsgid ||
+ if (gid == old->gid || gid == old->egid ||
+ gid == old->sgid || gid == old->fsgid ||
capable(CAP_SETGID)) {
if (gid != old_fsgid) {
- set_dumpable(current->mm, suid_dumpable);
- smp_wmb();
+ new->fsgid = gid;
+ goto change_okay;
}
- current->fsgid = gid;
- key_fsgid_changed(current);
- proc_id_connector(current, PROC_EVENT_GID);
}
+
+error:
+ abort_creds(new);
+ return old_fsgid;
+
+change_okay:
+ commit_creds(new);
return old_fsgid;
}
@@ -1118,7 +1167,7 @@
/* export the group_info to a user-space array */
static int groups_to_user(gid_t __user *grouplist,
- struct group_info *group_info)
+ const struct group_info *group_info)
{
int i;
unsigned int count = group_info->ngroups;
@@ -1186,7 +1235,7 @@
}
/* a simple bsearch */
-int groups_search(struct group_info *group_info, gid_t grp)
+int groups_search(const struct group_info *group_info, gid_t grp)
{
unsigned int left, right;
@@ -1208,51 +1257,74 @@
return 0;
}
-/* validate and set current->group_info */
-int set_current_groups(struct group_info *group_info)
+/**
+ * set_groups - Change a group subscription in a set of credentials
+ * @new: The newly prepared set of credentials to alter
+ * @group_info: The group list to install
+ *
+ * Validate a group subscription and, if valid, insert it into a set
+ * of credentials.
+ */
+int set_groups(struct cred *new, struct group_info *group_info)
{
int retval;
- struct group_info *old_info;
retval = security_task_setgroups(group_info);
if (retval)
return retval;
+ put_group_info(new->group_info);
groups_sort(group_info);
get_group_info(group_info);
-
- task_lock(current);
- old_info = current->group_info;
- current->group_info = group_info;
- task_unlock(current);
-
- put_group_info(old_info);
-
+ new->group_info = group_info;
return 0;
}
+EXPORT_SYMBOL(set_groups);
+
+/**
+ * set_current_groups - Change current's group subscription
+ * @group_info: The group list to impose
+ *
+ * Validate a group subscription and, if valid, impose it upon current's task
+ * security record.
+ */
+int set_current_groups(struct group_info *group_info)
+{
+ struct cred *new;
+ int ret;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ ret = set_groups(new, group_info);
+ if (ret < 0) {
+ abort_creds(new);
+ return ret;
+ }
+
+ return commit_creds(new);
+}
+
EXPORT_SYMBOL(set_current_groups);
asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist)
{
- int i = 0;
-
- /*
- * SMP: Nobody else can change our grouplist. Thus we are
- * safe.
- */
+ const struct cred *cred = current_cred();
+ int i;
if (gidsetsize < 0)
return -EINVAL;
/* no need to grab task_lock here; it cannot change */
- i = current->group_info->ngroups;
+ i = cred->group_info->ngroups;
if (gidsetsize) {
if (i > gidsetsize) {
i = -EINVAL;
goto out;
}
- if (groups_to_user(grouplist, current->group_info)) {
+ if (groups_to_user(grouplist, cred->group_info)) {
i = -EFAULT;
goto out;
}
@@ -1296,9 +1368,11 @@
*/
int in_group_p(gid_t grp)
{
+ const struct cred *cred = current_cred();
int retval = 1;
- if (grp != current->fsgid)
- retval = groups_search(current->group_info, grp);
+
+ if (grp != cred->fsgid)
+ retval = groups_search(cred->group_info, grp);
return retval;
}
@@ -1306,9 +1380,11 @@
int in_egroup_p(gid_t grp)
{
+ const struct cred *cred = current_cred();
int retval = 1;
- if (grp != current->egid)
- retval = groups_search(current->group_info, grp);
+
+ if (grp != cred->egid)
+ retval = groups_search(cred->group_info, grp);
return retval;
}
@@ -1624,50 +1700,56 @@
asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
- long error = 0;
+ struct task_struct *me = current;
+ unsigned char comm[sizeof(me->comm)];
+ long error;
- if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
+ error = security_task_prctl(option, arg2, arg3, arg4, arg5);
+ if (error != -ENOSYS)
return error;
+ error = 0;
switch (option) {
case PR_SET_PDEATHSIG:
if (!valid_signal(arg2)) {
error = -EINVAL;
break;
}
- current->pdeath_signal = arg2;
+ me->pdeath_signal = arg2;
+ error = 0;
break;
case PR_GET_PDEATHSIG:
- error = put_user(current->pdeath_signal, (int __user *)arg2);
+ error = put_user(me->pdeath_signal, (int __user *)arg2);
break;
case PR_GET_DUMPABLE:
- error = get_dumpable(current->mm);
+ error = get_dumpable(me->mm);
break;
case PR_SET_DUMPABLE:
if (arg2 < 0 || arg2 > 1) {
error = -EINVAL;
break;
}
- set_dumpable(current->mm, arg2);
+ set_dumpable(me->mm, arg2);
+ error = 0;
break;
case PR_SET_UNALIGN:
- error = SET_UNALIGN_CTL(current, arg2);
+ error = SET_UNALIGN_CTL(me, arg2);
break;
case PR_GET_UNALIGN:
- error = GET_UNALIGN_CTL(current, arg2);
+ error = GET_UNALIGN_CTL(me, arg2);
break;
case PR_SET_FPEMU:
- error = SET_FPEMU_CTL(current, arg2);
+ error = SET_FPEMU_CTL(me, arg2);
break;
case PR_GET_FPEMU:
- error = GET_FPEMU_CTL(current, arg2);
+ error = GET_FPEMU_CTL(me, arg2);
break;
case PR_SET_FPEXC:
- error = SET_FPEXC_CTL(current, arg2);
+ error = SET_FPEXC_CTL(me, arg2);
break;
case PR_GET_FPEXC:
- error = GET_FPEXC_CTL(current, arg2);
+ error = GET_FPEXC_CTL(me, arg2);
break;
case PR_GET_TIMING:
error = PR_TIMING_STATISTICAL;
@@ -1675,33 +1757,28 @@
case PR_SET_TIMING:
if (arg2 != PR_TIMING_STATISTICAL)
error = -EINVAL;
+ else
+ error = 0;
break;
- case PR_SET_NAME: {
- struct task_struct *me = current;
- unsigned char ncomm[sizeof(me->comm)];
-
- ncomm[sizeof(me->comm)-1] = 0;
- if (strncpy_from_user(ncomm, (char __user *)arg2,
- sizeof(me->comm)-1) < 0)
+ case PR_SET_NAME:
+ comm[sizeof(me->comm)-1] = 0;
+ if (strncpy_from_user(comm, (char __user *)arg2,
+ sizeof(me->comm) - 1) < 0)
return -EFAULT;
- set_task_comm(me, ncomm);
+ set_task_comm(me, comm);
return 0;
- }
- case PR_GET_NAME: {
- struct task_struct *me = current;
- unsigned char tcomm[sizeof(me->comm)];
-
- get_task_comm(tcomm, me);
- if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm)))
+ case PR_GET_NAME:
+ get_task_comm(comm, me);
+ if (copy_to_user((char __user *)arg2, comm,
+ sizeof(comm)))
return -EFAULT;
return 0;
- }
case PR_GET_ENDIAN:
- error = GET_ENDIAN(current, arg2);
+ error = GET_ENDIAN(me, arg2);
break;
case PR_SET_ENDIAN:
- error = SET_ENDIAN(current, arg2);
+ error = SET_ENDIAN(me, arg2);
break;
case PR_GET_SECCOMP:
@@ -1725,6 +1802,7 @@
current->default_timer_slack_ns;
else
current->timer_slack_ns = arg2;
+ error = 0;
break;
default:
error = -EINVAL;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9d048fa..5110313 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1641,7 +1641,7 @@
static int test_perm(int mode, int op)
{
- if (!current->euid)
+ if (!current_euid())
mode >>= 6;
else if (in_egroup_p(0))
mode >>= 3;
diff --git a/kernel/timer.c b/kernel/timer.c
index dbd50fa..566257d 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1192,25 +1192,25 @@
asmlinkage long sys_getuid(void)
{
/* Only we change this so SMP safe */
- return current->uid;
+ return current_uid();
}
asmlinkage long sys_geteuid(void)
{
/* Only we change this so SMP safe */
- return current->euid;
+ return current_euid();
}
asmlinkage long sys_getgid(void)
{
/* Only we change this so SMP safe */
- return current->gid;
+ return current_gid();
}
asmlinkage long sys_getegid(void)
{
/* Only we change this so SMP safe */
- return current->egid;
+ return current_egid();
}
#endif
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 697eda3..ffe7c96 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -246,7 +246,7 @@
memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
data->pid = tsk->pid;
- data->uid = tsk->uid;
+ data->uid = task_uid(tsk);
data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
data->policy = tsk->policy;
data->rt_priority = tsk->rt_priority;
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 8ebcd85..2dc06ab 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -27,6 +27,7 @@
*/
void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
{
+ const struct cred *tcred;
struct timespec uptime, ts;
u64 ac_etime;
@@ -53,10 +54,11 @@
stats->ac_flag |= AXSIG;
stats->ac_nice = task_nice(tsk);
stats->ac_sched = tsk->policy;
- stats->ac_uid = tsk->uid;
- stats->ac_gid = tsk->gid;
stats->ac_pid = tsk->pid;
rcu_read_lock();
+ tcred = __task_cred(tsk);
+ stats->ac_uid = tcred->uid;
+ stats->ac_gid = tcred->gid;
stats->ac_ppid = pid_alive(tsk) ?
rcu_dereference(tsk->real_parent)->tgid : 0;
rcu_read_unlock();
diff --git a/kernel/uid16.c b/kernel/uid16.c
index 3e41c16..2460c31 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -84,11 +84,12 @@
asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
{
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
- !(retval = put_user(high2lowuid(current->euid), euid)))
- retval = put_user(high2lowuid(current->suid), suid);
+ if (!(retval = put_user(high2lowuid(cred->uid), ruid)) &&
+ !(retval = put_user(high2lowuid(cred->euid), euid)))
+ retval = put_user(high2lowuid(cred->suid), suid);
return retval;
}
@@ -104,11 +105,12 @@
asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
{
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
- !(retval = put_user(high2lowgid(current->egid), egid)))
- retval = put_user(high2lowgid(current->sgid), sgid);
+ if (!(retval = put_user(high2lowgid(cred->gid), rgid)) &&
+ !(retval = put_user(high2lowgid(cred->egid), egid)))
+ retval = put_user(high2lowgid(cred->sgid), sgid);
return retval;
}
@@ -161,25 +163,24 @@
asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
{
- int i = 0;
+ const struct cred *cred = current_cred();
+ int i;
if (gidsetsize < 0)
return -EINVAL;
- get_group_info(current->group_info);
- i = current->group_info->ngroups;
+ i = cred->group_info->ngroups;
if (gidsetsize) {
if (i > gidsetsize) {
i = -EINVAL;
goto out;
}
- if (groups16_to_user(grouplist, current->group_info)) {
+ if (groups16_to_user(grouplist, cred->group_info)) {
i = -EFAULT;
goto out;
}
}
out:
- put_group_info(current->group_info);
return i;
}
@@ -210,20 +211,20 @@
asmlinkage long sys_getuid16(void)
{
- return high2lowuid(current->uid);
+ return high2lowuid(current_uid());
}
asmlinkage long sys_geteuid16(void)
{
- return high2lowuid(current->euid);
+ return high2lowuid(current_euid());
}
asmlinkage long sys_getgid16(void)
{
- return high2lowgid(current->gid);
+ return high2lowgid(current_gid());
}
asmlinkage long sys_getegid16(void)
{
- return high2lowgid(current->egid);
+ return high2lowgid(current_egid());
}
diff --git a/kernel/user.c b/kernel/user.c
index 39d6159..d476307d 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -16,6 +16,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/user_namespace.h>
+#include "cred-internals.h"
struct user_namespace init_user_ns = {
.kref = {
@@ -104,16 +105,10 @@
return rc;
}
-static void sched_switch_user(struct task_struct *p)
-{
- sched_move_task(p);
-}
-
#else /* CONFIG_USER_SCHED */
static void sched_destroy_user(struct user_struct *up) { }
static int sched_create_user(struct user_struct *up) { return 0; }
-static void sched_switch_user(struct task_struct *p) { }
#endif /* CONFIG_USER_SCHED */
@@ -448,36 +443,6 @@
return NULL;
}
-void switch_uid(struct user_struct *new_user)
-{
- struct user_struct *old_user;
-
- /* What if a process setreuid()'s and this brings the
- * new uid over his NPROC rlimit? We can check this now
- * cheaply with the new uid cache, so if it matters
- * we should be checking for it. -DaveM
- */
- old_user = current->user;
- atomic_inc(&new_user->processes);
- atomic_dec(&old_user->processes);
- switch_uid_keyring(new_user);
- current->user = new_user;
- sched_switch_user(current);
-
- /*
- * We need to synchronize with __sigqueue_alloc()
- * doing a get_uid(p->user).. If that saw the old
- * user value, we need to wait until it has exited
- * its critical region before we can free the old
- * structure.
- */
- smp_mb();
- spin_unlock_wait(¤t->sighand->siglock);
-
- free_uid(old_user);
- suid_keys(current);
-}
-
#ifdef CONFIG_USER_NS
void release_uids(struct user_namespace *ns)
{
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 532858f..0d9c51d 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -19,6 +19,7 @@
{
struct user_namespace *ns;
struct user_struct *new_user;
+ struct cred *new;
int n;
ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
@@ -38,14 +39,23 @@
}
/* Reset current->user with a new one */
- new_user = alloc_uid(ns, current->uid);
+ new_user = alloc_uid(ns, current_uid());
if (!new_user) {
free_uid(ns->root_user);
kfree(ns);
return ERR_PTR(-ENOMEM);
}
- switch_uid(new_user);
+ /* Install the new user */
+ new = prepare_creds();
+ if (!new) {
+ free_uid(new_user);
+ free_uid(ns->root_user);
+ kfree(ns);
+ }
+ free_uid(new->user);
+ new->user = new_user;
+ commit_creds(new);
return ns;
}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d4dc69d..4952322 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -84,21 +84,21 @@
static cpumask_t cpu_populated_map __read_mostly;
/* If it's single threaded, it isn't in the list of workqueues. */
-static inline int is_single_threaded(struct workqueue_struct *wq)
+static inline int is_wq_single_threaded(struct workqueue_struct *wq)
{
return wq->singlethread;
}
static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
{
- return is_single_threaded(wq)
+ return is_wq_single_threaded(wq)
? &cpu_singlethread_map : &cpu_populated_map;
}
static
struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)
{
- if (unlikely(is_single_threaded(wq)))
+ if (unlikely(is_wq_single_threaded(wq)))
cpu = singlethread_cpu;
return per_cpu_ptr(wq->cpu_wq, cpu);
}
@@ -769,7 +769,7 @@
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
struct workqueue_struct *wq = cwq->wq;
- const char *fmt = is_single_threaded(wq) ? "%s" : "%s/%d";
+ const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
struct task_struct *p;
p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);
diff --git a/lib/Makefile b/lib/Makefile
index 7cb65d8..80fe8a3 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -11,7 +11,7 @@
rbtree.o radix-tree.o dump_stack.o \
idr.o int_sqrt.o extable.o prio_tree.o \
sha1.o irq_regs.o reciprocal_div.o argv_split.o \
- proportions.o prio_heap.o ratelimit.o show_mem.o
+ proportions.o prio_heap.o ratelimit.o show_mem.o is_single_threaded.o
lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o
diff --git a/lib/is_single_threaded.c b/lib/is_single_threaded.c
new file mode 100644
index 0000000..f1ed2fe
--- /dev/null
+++ b/lib/is_single_threaded.c
@@ -0,0 +1,45 @@
+/* Function to determine if a thread group is single threaded or not
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from security/selinux/hooks.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+
+/**
+ * is_single_threaded - Determine if a thread group is single-threaded or not
+ * @p: A task in the thread group in question
+ *
+ * This returns true if the thread group to which a task belongs is single
+ * threaded, false if it is not.
+ */
+bool is_single_threaded(struct task_struct *p)
+{
+ struct task_struct *g, *t;
+ struct mm_struct *mm = p->mm;
+
+ if (atomic_read(&p->signal->count) != 1)
+ goto no;
+
+ if (atomic_read(&p->mm->mm_users) != 1) {
+ read_lock(&tasklist_lock);
+ do_each_thread(g, t) {
+ if (t->mm == mm && t != p)
+ goto no_unlock;
+ } while_each_thread(g, t);
+ read_unlock(&tasklist_lock);
+ }
+
+ return true;
+
+no_unlock:
+ read_unlock(&tasklist_lock);
+no:
+ return false;
+}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index e9493b1..e412ffa 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1114,6 +1114,7 @@
const unsigned long __user *old_nodes,
const unsigned long __user *new_nodes)
{
+ const struct cred *cred = current_cred(), *tcred;
struct mm_struct *mm;
struct task_struct *task;
nodemask_t old;
@@ -1148,12 +1149,16 @@
* capabilities, superuser privileges or the same
* userid as the target process.
*/
- if ((current->euid != task->suid) && (current->euid != task->uid) &&
- (current->uid != task->suid) && (current->uid != task->uid) &&
+ rcu_read_lock();
+ tcred = __task_cred(task);
+ if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
+ cred->uid != tcred->suid && cred->uid != tcred->uid &&
!capable(CAP_SYS_NICE)) {
+ rcu_read_unlock();
err = -EPERM;
goto out;
}
+ rcu_read_unlock();
task_nodes = cpuset_mems_allowed(task);
/* Is the user allowed to access the target nodes? */
diff --git a/mm/migrate.c b/mm/migrate.c
index 385db89..9dd10da 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1045,6 +1045,7 @@
const int __user *nodes,
int __user *status, int flags)
{
+ const struct cred *cred = current_cred(), *tcred;
struct task_struct *task;
struct mm_struct *mm;
int err;
@@ -1075,12 +1076,16 @@
* capabilities, superuser privileges or the same
* userid as the target process.
*/
- if ((current->euid != task->suid) && (current->euid != task->uid) &&
- (current->uid != task->suid) && (current->uid != task->uid) &&
+ rcu_read_lock();
+ tcred = __task_cred(task);
+ if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
+ cred->uid != tcred->suid && cred->uid != tcred->uid &&
!capable(CAP_SYS_NICE)) {
+ rcu_read_unlock();
err = -EPERM;
goto out;
}
+ rcu_read_unlock();
err = security_task_movememory(task);
if (err)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index a0a0190..558f9af 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -128,8 +128,8 @@
* Superuser processes are usually more important, so we make it
* less likely that we kill those.
*/
- if (has_capability(p, CAP_SYS_ADMIN) ||
- has_capability(p, CAP_SYS_RESOURCE))
+ if (has_capability_noaudit(p, CAP_SYS_ADMIN) ||
+ has_capability_noaudit(p, CAP_SYS_RESOURCE))
points /= 4;
/*
@@ -138,7 +138,7 @@
* tend to only have this flag set on applications they think
* of as important.
*/
- if (has_capability(p, CAP_SYS_RAWIO))
+ if (has_capability_noaudit(p, CAP_SYS_RAWIO))
points /= 4;
/*
@@ -299,9 +299,9 @@
task_lock(p);
printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n",
- p->pid, p->uid, p->tgid, p->mm->total_vm,
- get_mm_rss(p->mm), (int)task_cpu(p), p->oomkilladj,
- p->comm);
+ p->pid, __task_cred(p)->uid, p->tgid,
+ p->mm->total_vm, get_mm_rss(p->mm), (int)task_cpu(p),
+ p->oomkilladj, p->comm);
task_unlock(p);
} while_each_thread(g, p);
}
diff --git a/mm/shmem.c b/mm/shmem.c
index 0ed0752..f1b0d48 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1513,8 +1513,8 @@
inode = new_inode(sb);
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mapping->backing_dev_info = &shmem_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
@@ -2278,8 +2278,8 @@
sbinfo->max_blocks = 0;
sbinfo->max_inodes = 0;
sbinfo->mode = S_IRWXUGO | S_ISVTX;
- sbinfo->uid = current->fsuid;
- sbinfo->gid = current->fsgid;
+ sbinfo->uid = current_fsuid();
+ sbinfo->gid = current_fsgid();
sbinfo->mpol = NULL;
sb->s_fs_info = sbinfo;
diff --git a/net/9p/client.c b/net/9p/client.c
index 4b52945..821f1ec 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -627,7 +627,7 @@
memset(&fid->qid, 0, sizeof(struct p9_qid));
fid->mode = -1;
fid->rdir_fpos = 0;
- fid->uid = current->fsuid;
+ fid->uid = current_fsuid();
fid->clnt = clnt;
fid->aux = NULL;
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 28c7157..00d9e5e 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1045,7 +1045,7 @@
if (addr->fsa_ax25.sax25_family != AF_AX25)
return -EINVAL;
- user = ax25_findbyuid(current->euid);
+ user = ax25_findbyuid(current_euid());
if (user) {
call = user->call;
ax25_uid_put(user);
diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c
index 8672cd8..c833ba4 100644
--- a/net/ax25/ax25_route.c
+++ b/net/ax25/ax25_route.c
@@ -421,7 +421,7 @@
goto put;
}
- user = ax25_findbyuid(current->euid);
+ user = ax25_findbyuid(current_euid());
if (user) {
ax25->source_addr = user->call;
ax25_uid_put(user);
diff --git a/net/core/dev.c b/net/core/dev.c
index 9174c77..89912ae 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2961,6 +2961,8 @@
static int __dev_set_promiscuity(struct net_device *dev, int inc)
{
unsigned short old_flags = dev->flags;
+ uid_t uid;
+ gid_t gid;
ASSERT_RTNL();
@@ -2985,15 +2987,17 @@
printk(KERN_INFO "device %s %s promiscuous mode\n",
dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
"left");
- if (audit_enabled)
+ if (audit_enabled) {
+ current_uid_gid(&uid, &gid);
audit_log(current->audit_context, GFP_ATOMIC,
AUDIT_ANOM_PROMISCUOUS,
"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
dev->name, (dev->flags & IFF_PROMISC),
(old_flags & IFF_PROMISC),
audit_get_loginuid(current),
- current->uid, current->gid,
+ uid, gid,
audit_get_sessionid(current));
+ }
dev_change_rx_flags(dev, IFF_PROMISC);
}
diff --git a/net/core/scm.c b/net/core/scm.c
index ab242cc..1e17949 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -44,11 +44,13 @@
static __inline__ int scm_check_creds(struct ucred *creds)
{
+ const struct cred *cred = current_cred();
+
if ((creds->pid == task_tgid_vnr(current) || capable(CAP_SYS_ADMIN)) &&
- ((creds->uid == current->uid || creds->uid == current->euid ||
- creds->uid == current->suid) || capable(CAP_SETUID)) &&
- ((creds->gid == current->gid || creds->gid == current->egid ||
- creds->gid == current->sgid) || capable(CAP_SETGID))) {
+ ((creds->uid == cred->uid || creds->uid == cred->euid ||
+ creds->uid == cred->suid) || capable(CAP_SETUID)) &&
+ ((creds->gid == cred->gid || creds->gid == cred->egid ||
+ creds->gid == cred->sgid) || capable(CAP_SETGID))) {
return 0;
}
return -EPERM;
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
index fc6ce04..7b5dbe1 100644
--- a/net/ipv4/netfilter/ipt_LOG.c
+++ b/net/ipv4/netfilter/ipt_LOG.c
@@ -340,8 +340,8 @@
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket && skb->sk->sk_socket->file)
printk("UID=%u GID=%u ",
- skb->sk->sk_socket->file->f_uid,
- skb->sk->sk_socket->file->f_gid);
+ skb->sk->sk_socket->file->f_cred->fsuid,
+ skb->sk->sk_socket->file->f_cred->fsgid);
read_unlock_bh(&skb->sk->sk_callback_lock);
}
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 37a4e77..bd3c7b9 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -388,7 +388,7 @@
fl->owner = current->pid;
break;
case IPV6_FL_S_USER:
- fl->owner = current->euid;
+ fl->owner = current_euid();
break;
default:
err = -EINVAL;
diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
index caa441d..871d157 100644
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ b/net/ipv6/netfilter/ip6t_LOG.c
@@ -364,8 +364,8 @@
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket && skb->sk->sk_socket->file)
printk("UID=%u GID=%u ",
- skb->sk->sk_socket->file->f_uid,
- skb->sk->sk_socket->file->f_gid);
+ skb->sk->sk_socket->file->f_cred->fsuid,
+ skb->sk->sk_socket->file->f_cred->fsgid);
read_unlock_bh(&skb->sk->sk_callback_lock);
}
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 41e0105..38f9efd 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -474,8 +474,9 @@
if (skb->sk) {
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
- __be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
- __be32 gid = htonl(skb->sk->sk_socket->file->f_gid);
+ struct file *file = skb->sk->sk_socket->file;
+ __be32 uid = htonl(file->f_cred->fsuid);
+ __be32 gid = htonl(file->f_cred->fsgid);
/* need to unlock here since NLA_PUT may goto */
read_unlock_bh(&skb->sk->sk_callback_lock);
NLA_PUT_BE32(inst->skb, NFULA_UID, uid);
diff --git a/net/netfilter/xt_owner.c b/net/netfilter/xt_owner.c
index f19ebd9..22b2a5e 100644
--- a/net/netfilter/xt_owner.c
+++ b/net/netfilter/xt_owner.c
@@ -34,12 +34,12 @@
return false;
if (info->match & IPT_OWNER_UID)
- if ((filp->f_uid != info->uid) ^
+ if ((filp->f_cred->fsuid != info->uid) ^
!!(info->invert & IPT_OWNER_UID))
return false;
if (info->match & IPT_OWNER_GID)
- if ((filp->f_gid != info->gid) ^
+ if ((filp->f_cred->fsgid != info->gid) ^
!!(info->invert & IPT_OWNER_GID))
return false;
@@ -60,12 +60,12 @@
return false;
if (info->match & IP6T_OWNER_UID)
- if ((filp->f_uid != info->uid) ^
+ if ((filp->f_cred->fsuid != info->uid) ^
!!(info->invert & IP6T_OWNER_UID))
return false;
if (info->match & IP6T_OWNER_GID)
- if ((filp->f_gid != info->gid) ^
+ if ((filp->f_cred->fsgid != info->gid) ^
!!(info->invert & IP6T_OWNER_GID))
return false;
@@ -93,14 +93,14 @@
(XT_OWNER_UID | XT_OWNER_GID)) == 0;
if (info->match & XT_OWNER_UID)
- if ((filp->f_uid >= info->uid_min &&
- filp->f_uid <= info->uid_max) ^
+ if ((filp->f_cred->fsuid >= info->uid_min &&
+ filp->f_cred->fsuid <= info->uid_max) ^
!(info->invert & XT_OWNER_UID))
return false;
if (info->match & XT_OWNER_GID)
- if ((filp->f_gid >= info->gid_min &&
- filp->f_gid <= info->gid_max) ^
+ if ((filp->f_cred->fsgid >= info->gid_min &&
+ filp->f_cred->fsgid <= info->gid_max) ^
!(info->invert & XT_OWNER_GID))
return false;
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 9f1ea4a..e9c05b8 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -609,7 +609,7 @@
} else {
source = &addr->fsa_ax25.sax25_call;
- user = ax25_findbyuid(current->euid);
+ user = ax25_findbyuid(current_euid());
if (user) {
nr->user_addr = user->call;
ax25_uid_put(user);
@@ -683,7 +683,7 @@
}
source = (ax25_address *)dev->dev_addr;
- user = ax25_findbyuid(current->euid);
+ user = ax25_findbyuid(current_euid());
if (user) {
nr->user_addr = user->call;
ax25_uid_put(user);
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index a7f1ce1..d902e2d 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -690,7 +690,7 @@
source = &addr->srose_call;
- user = ax25_findbyuid(current->euid);
+ user = ax25_findbyuid(current_euid());
if (user) {
rose->source_call = user->call;
ax25_uid_put(user);
@@ -791,7 +791,7 @@
goto out_release;
}
- user = ax25_findbyuid(current->euid);
+ user = ax25_findbyuid(current_euid());
if (!user) {
err = -EINVAL;
goto out_release;
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
index 9a8ff68..ad8c7a7 100644
--- a/net/rxrpc/ar-key.c
+++ b/net/rxrpc/ar-key.c
@@ -287,6 +287,7 @@
time_t expiry,
u32 kvno)
{
+ const struct cred *cred = current_cred();
struct key *key;
int ret;
@@ -297,7 +298,7 @@
_enter("");
- key = key_alloc(&key_type_rxrpc, "x", 0, 0, current, 0,
+ key = key_alloc(&key_type_rxrpc, "x", 0, 0, cred, 0,
KEY_ALLOC_NOT_IN_QUOTA);
if (IS_ERR(key)) {
_leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
@@ -340,10 +341,11 @@
*/
struct key *rxrpc_get_null_key(const char *keyname)
{
+ const struct cred *cred = current_cred();
struct key *key;
int ret;
- key = key_alloc(&key_type_rxrpc, keyname, 0, 0, current,
+ key = key_alloc(&key_type_rxrpc, keyname, 0, 0, cred,
KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA);
if (IS_ERR(key))
return key;
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 0ebaff6..0ef4e30 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -260,14 +260,14 @@
static u32 flow_get_skuid(const struct sk_buff *skb)
{
if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
- return skb->sk->sk_socket->file->f_uid;
+ return skb->sk->sk_socket->file->f_cred->fsuid;
return 0;
}
static u32 flow_get_skgid(const struct sk_buff *skb)
{
if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
- return skb->sk->sk_socket->file->f_gid;
+ return skb->sk->sk_socket->file->f_cred->fsgid;
return 0;
}
diff --git a/net/socket.c b/net/socket.c
index 57550c3..62c7729 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -491,8 +491,8 @@
sock = SOCKET_I(inode);
inode->i_mode = S_IFSOCK | S_IRWXUGO;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
get_cpu_var(sockets_in_use)++;
put_cpu_var(sockets_in_use);
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index cb216b2..0443f83 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -350,16 +350,18 @@
struct rpc_cred *
rpcauth_lookupcred(struct rpc_auth *auth, int flags)
{
- struct auth_cred acred = {
- .uid = current->fsuid,
- .gid = current->fsgid,
- .group_info = current->group_info,
- };
+ struct auth_cred acred;
struct rpc_cred *ret;
+ const struct cred *cred = current_cred();
dprintk("RPC: looking up %s cred\n",
auth->au_ops->au_name);
- get_group_info(acred.group_info);
+
+ memset(&acred, 0, sizeof(acred));
+ acred.uid = cred->fsuid;
+ acred.gid = cred->fsgid;
+ acred.group_info = get_group_info(((struct cred *)cred)->group_info);
+
ret = auth->au_ops->lookup_cred(auth, &acred, flags);
put_group_info(acred.group_info);
return ret;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index eb90f77..2775acb 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -467,8 +467,7 @@
sk->sk_state = TCP_LISTEN;
/* set credentials so connect can copy them */
sk->sk_peercred.pid = task_tgid_vnr(current);
- sk->sk_peercred.uid = current->euid;
- sk->sk_peercred.gid = current->egid;
+ current_euid_egid(&sk->sk_peercred.uid, &sk->sk_peercred.gid);
err = 0;
out_unlock:
@@ -1126,8 +1125,7 @@
newsk->sk_state = TCP_ESTABLISHED;
newsk->sk_type = sk->sk_type;
newsk->sk_peercred.pid = task_tgid_vnr(current);
- newsk->sk_peercred.uid = current->euid;
- newsk->sk_peercred.gid = current->egid;
+ current_euid_egid(&newsk->sk_peercred.uid, &newsk->sk_peercred.gid);
newu = unix_sk(newsk);
newsk->sk_sleep = &newu->peer_wait;
otheru = unix_sk(other);
@@ -1187,8 +1185,9 @@
unix_peer(ska)=skb;
unix_peer(skb)=ska;
ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current);
- ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid;
- ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid;
+ current_euid_egid(&skb->sk_peercred.uid, &skb->sk_peercred.gid);
+ ska->sk_peercred.uid = skb->sk_peercred.uid;
+ ska->sk_peercred.gid = skb->sk_peercred.gid;
if (ska->sk_type != SOCK_DGRAM) {
ska->sk_state = TCP_ESTABLISHED;
diff --git a/security/capability.c b/security/capability.c
index 2458748..b9e3914 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -32,24 +32,19 @@
return 0;
}
-static int cap_bprm_alloc_security(struct linux_binprm *bprm)
+static int cap_bprm_check_security (struct linux_binprm *bprm)
{
return 0;
}
-static void cap_bprm_free_security(struct linux_binprm *bprm)
+static void cap_bprm_committing_creds(struct linux_binprm *bprm)
{
}
-static void cap_bprm_post_apply_creds(struct linux_binprm *bprm)
+static void cap_bprm_committed_creds(struct linux_binprm *bprm)
{
}
-static int cap_bprm_check_security(struct linux_binprm *bprm)
-{
- return 0;
-}
-
static int cap_sb_alloc_security(struct super_block *sb)
{
return 0;
@@ -330,7 +325,7 @@
return 0;
}
-static int cap_dentry_open(struct file *file)
+static int cap_dentry_open(struct file *file, const struct cred *cred)
{
return 0;
}
@@ -340,15 +335,29 @@
return 0;
}
-static int cap_task_alloc_security(struct task_struct *p)
+static void cap_cred_free(struct cred *cred)
+{
+}
+
+static int cap_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp)
{
return 0;
}
-static void cap_task_free_security(struct task_struct *p)
+static void cap_cred_commit(struct cred *new, const struct cred *old)
{
}
+static int cap_kernel_act_as(struct cred *new, u32 secid)
+{
+ return 0;
+}
+
+static int cap_kernel_create_files_as(struct cred *new, struct inode *inode)
+{
+ return 0;
+}
+
static int cap_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
{
return 0;
@@ -750,7 +759,7 @@
}
#ifdef CONFIG_KEYS
-static int cap_key_alloc(struct key *key, struct task_struct *ctx,
+static int cap_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
return 0;
@@ -760,7 +769,7 @@
{
}
-static int cap_key_permission(key_ref_t key_ref, struct task_struct *context,
+static int cap_key_permission(key_ref_t key_ref, const struct cred *cred,
key_perm_t perm)
{
return 0;
@@ -814,8 +823,7 @@
set_to_cap_if_null(ops, ptrace_may_access);
set_to_cap_if_null(ops, ptrace_traceme);
set_to_cap_if_null(ops, capget);
- set_to_cap_if_null(ops, capset_check);
- set_to_cap_if_null(ops, capset_set);
+ set_to_cap_if_null(ops, capset);
set_to_cap_if_null(ops, acct);
set_to_cap_if_null(ops, capable);
set_to_cap_if_null(ops, quotactl);
@@ -824,11 +832,9 @@
set_to_cap_if_null(ops, syslog);
set_to_cap_if_null(ops, settime);
set_to_cap_if_null(ops, vm_enough_memory);
- set_to_cap_if_null(ops, bprm_alloc_security);
- set_to_cap_if_null(ops, bprm_free_security);
- set_to_cap_if_null(ops, bprm_apply_creds);
- set_to_cap_if_null(ops, bprm_post_apply_creds);
- set_to_cap_if_null(ops, bprm_set_security);
+ set_to_cap_if_null(ops, bprm_set_creds);
+ set_to_cap_if_null(ops, bprm_committing_creds);
+ set_to_cap_if_null(ops, bprm_committed_creds);
set_to_cap_if_null(ops, bprm_check_security);
set_to_cap_if_null(ops, bprm_secureexec);
set_to_cap_if_null(ops, sb_alloc_security);
@@ -890,10 +896,13 @@
set_to_cap_if_null(ops, file_receive);
set_to_cap_if_null(ops, dentry_open);
set_to_cap_if_null(ops, task_create);
- set_to_cap_if_null(ops, task_alloc_security);
- set_to_cap_if_null(ops, task_free_security);
+ set_to_cap_if_null(ops, cred_free);
+ set_to_cap_if_null(ops, cred_prepare);
+ set_to_cap_if_null(ops, cred_commit);
+ set_to_cap_if_null(ops, kernel_act_as);
+ set_to_cap_if_null(ops, kernel_create_files_as);
set_to_cap_if_null(ops, task_setuid);
- set_to_cap_if_null(ops, task_post_setuid);
+ set_to_cap_if_null(ops, task_fix_setuid);
set_to_cap_if_null(ops, task_setgid);
set_to_cap_if_null(ops, task_setpgid);
set_to_cap_if_null(ops, task_getpgid);
@@ -910,7 +919,6 @@
set_to_cap_if_null(ops, task_wait);
set_to_cap_if_null(ops, task_kill);
set_to_cap_if_null(ops, task_prctl);
- set_to_cap_if_null(ops, task_reparent_to_init);
set_to_cap_if_null(ops, task_to_inode);
set_to_cap_if_null(ops, ipc_permission);
set_to_cap_if_null(ops, ipc_getsecid);
diff --git a/security/commoncap.c b/security/commoncap.c
index 3976613..19cb398 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -8,6 +8,7 @@
*/
#include <linux/capability.h>
+#include <linux/audit.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -29,7 +30,7 @@
int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
{
- NETLINK_CB(skb).eff_cap = current->cap_effective;
+ NETLINK_CB(skb).eff_cap = current_cap();
return 0;
}
@@ -39,23 +40,41 @@
return -EPERM;
return 0;
}
-
EXPORT_SYMBOL(cap_netlink_recv);
-/*
+/**
+ * cap_capable - Determine whether a task has a particular effective capability
+ * @tsk: The task to query
+ * @cap: The capability to check for
+ * @audit: Whether to write an audit message or not
+ *
+ * Determine whether the nominated task has the specified capability amongst
+ * its effective set, returning 0 if it does, -ve if it does not.
+ *
* NOTE WELL: cap_capable() cannot be used like the kernel's capable()
- * function. That is, it has the reverse semantics: cap_capable()
- * returns 0 when a task has a capability, but the kernel's capable()
- * returns 1 for this case.
+ * function. That is, it has the reverse semantics: cap_capable() returns 0
+ * when a task has a capability, but the kernel's capable() returns 1 for this
+ * case.
*/
-int cap_capable (struct task_struct *tsk, int cap)
+int cap_capable(struct task_struct *tsk, int cap, int audit)
{
+ __u32 cap_raised;
+
/* Derived from include/linux/sched.h:capable. */
- if (cap_raised(tsk->cap_effective, cap))
- return 0;
- return -EPERM;
+ rcu_read_lock();
+ cap_raised = cap_raised(__task_cred(tsk)->cap_effective, cap);
+ rcu_read_unlock();
+ return cap_raised ? 0 : -EPERM;
}
+/**
+ * cap_settime - Determine whether the current process may set the system clock
+ * @ts: The time to set
+ * @tz: The timezone to set
+ *
+ * Determine whether the current process may set the system clock and timezone
+ * information, returning 0 if permission granted, -ve if denied.
+ */
int cap_settime(struct timespec *ts, struct timezone *tz)
{
if (!capable(CAP_SYS_TIME))
@@ -63,121 +82,157 @@
return 0;
}
+/**
+ * cap_ptrace_may_access - Determine whether the current process may access
+ * another
+ * @child: The process to be accessed
+ * @mode: The mode of attachment.
+ *
+ * Determine whether a process may access another, returning 0 if permission
+ * granted, -ve if denied.
+ */
int cap_ptrace_may_access(struct task_struct *child, unsigned int mode)
{
- /* Derived from arch/i386/kernel/ptrace.c:sys_ptrace. */
- if (cap_issubset(child->cap_permitted, current->cap_permitted))
- return 0;
- if (capable(CAP_SYS_PTRACE))
- return 0;
- return -EPERM;
+ int ret = 0;
+
+ rcu_read_lock();
+ if (!cap_issubset(__task_cred(child)->cap_permitted,
+ current_cred()->cap_permitted) &&
+ !capable(CAP_SYS_PTRACE))
+ ret = -EPERM;
+ rcu_read_unlock();
+ return ret;
}
+/**
+ * cap_ptrace_traceme - Determine whether another process may trace the current
+ * @parent: The task proposed to be the tracer
+ *
+ * Determine whether the nominated task is permitted to trace the current
+ * process, returning 0 if permission is granted, -ve if denied.
+ */
int cap_ptrace_traceme(struct task_struct *parent)
{
- /* Derived from arch/i386/kernel/ptrace.c:sys_ptrace. */
- if (cap_issubset(current->cap_permitted, parent->cap_permitted))
- return 0;
- if (has_capability(parent, CAP_SYS_PTRACE))
- return 0;
- return -EPERM;
+ int ret = 0;
+
+ rcu_read_lock();
+ if (!cap_issubset(current_cred()->cap_permitted,
+ __task_cred(parent)->cap_permitted) &&
+ !has_capability(parent, CAP_SYS_PTRACE))
+ ret = -EPERM;
+ rcu_read_unlock();
+ return ret;
}
-int cap_capget (struct task_struct *target, kernel_cap_t *effective,
- kernel_cap_t *inheritable, kernel_cap_t *permitted)
+/**
+ * cap_capget - Retrieve a task's capability sets
+ * @target: The task from which to retrieve the capability sets
+ * @effective: The place to record the effective set
+ * @inheritable: The place to record the inheritable set
+ * @permitted: The place to record the permitted set
+ *
+ * This function retrieves the capabilities of the nominated task and returns
+ * them to the caller.
+ */
+int cap_capget(struct task_struct *target, kernel_cap_t *effective,
+ kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
+ const struct cred *cred;
+
/* Derived from kernel/capability.c:sys_capget. */
- *effective = target->cap_effective;
- *inheritable = target->cap_inheritable;
- *permitted = target->cap_permitted;
+ rcu_read_lock();
+ cred = __task_cred(target);
+ *effective = cred->cap_effective;
+ *inheritable = cred->cap_inheritable;
+ *permitted = cred->cap_permitted;
+ rcu_read_unlock();
return 0;
}
-#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
-
-static inline int cap_block_setpcap(struct task_struct *target)
-{
- /*
- * No support for remote process capability manipulation with
- * filesystem capability support.
- */
- return (target != current);
-}
-
+/*
+ * Determine whether the inheritable capabilities are limited to the old
+ * permitted set. Returns 1 if they are limited, 0 if they are not.
+ */
static inline int cap_inh_is_capped(void)
{
- /*
- * Return 1 if changes to the inheritable set are limited
- * to the old permitted set. That is, if the current task
- * does *not* possess the CAP_SETPCAP capability.
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+
+ /* they are so limited unless the current task has the CAP_SETPCAP
+ * capability
*/
- return (cap_capable(current, CAP_SETPCAP) != 0);
+ if (cap_capable(current, CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0)
+ return 0;
+#endif
+ return 1;
}
-static inline int cap_limit_ptraced_target(void) { return 1; }
-
-#else /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
-
-static inline int cap_block_setpcap(struct task_struct *t) { return 0; }
-static inline int cap_inh_is_capped(void) { return 1; }
-static inline int cap_limit_ptraced_target(void)
+/**
+ * cap_capset - Validate and apply proposed changes to current's capabilities
+ * @new: The proposed new credentials; alterations should be made here
+ * @old: The current task's current credentials
+ * @effective: A pointer to the proposed new effective capabilities set
+ * @inheritable: A pointer to the proposed new inheritable capabilities set
+ * @permitted: A pointer to the proposed new permitted capabilities set
+ *
+ * This function validates and applies a proposed mass change to the current
+ * process's capability sets. The changes are made to the proposed new
+ * credentials, and assuming no error, will be committed by the caller of LSM.
+ */
+int cap_capset(struct cred *new,
+ const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted)
{
- return !capable(CAP_SETPCAP);
-}
-
-#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
-
-int cap_capset_check (struct task_struct *target, kernel_cap_t *effective,
- kernel_cap_t *inheritable, kernel_cap_t *permitted)
-{
- if (cap_block_setpcap(target)) {
- return -EPERM;
- }
- if (cap_inh_is_capped()
- && !cap_issubset(*inheritable,
- cap_combine(target->cap_inheritable,
- current->cap_permitted))) {
+ if (cap_inh_is_capped() &&
+ !cap_issubset(*inheritable,
+ cap_combine(old->cap_inheritable,
+ old->cap_permitted)))
/* incapable of using this inheritable set */
return -EPERM;
- }
+
if (!cap_issubset(*inheritable,
- cap_combine(target->cap_inheritable,
- current->cap_bset))) {
+ cap_combine(old->cap_inheritable,
+ old->cap_bset)))
/* no new pI capabilities outside bounding set */
return -EPERM;
- }
/* verify restrictions on target's new Permitted set */
- if (!cap_issubset (*permitted,
- cap_combine (target->cap_permitted,
- current->cap_permitted))) {
+ if (!cap_issubset(*permitted, old->cap_permitted))
return -EPERM;
- }
/* verify the _new_Effective_ is a subset of the _new_Permitted_ */
- if (!cap_issubset (*effective, *permitted)) {
+ if (!cap_issubset(*effective, *permitted))
return -EPERM;
- }
+ new->cap_effective = *effective;
+ new->cap_inheritable = *inheritable;
+ new->cap_permitted = *permitted;
return 0;
}
-void cap_capset_set (struct task_struct *target, kernel_cap_t *effective,
- kernel_cap_t *inheritable, kernel_cap_t *permitted)
-{
- target->cap_effective = *effective;
- target->cap_inheritable = *inheritable;
- target->cap_permitted = *permitted;
-}
-
+/*
+ * Clear proposed capability sets for execve().
+ */
static inline void bprm_clear_caps(struct linux_binprm *bprm)
{
- cap_clear(bprm->cap_post_exec_permitted);
+ cap_clear(bprm->cred->cap_permitted);
bprm->cap_effective = false;
}
#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+/**
+ * cap_inode_need_killpriv - Determine if inode change affects privileges
+ * @dentry: The inode/dentry in being changed with change marked ATTR_KILL_PRIV
+ *
+ * Determine if an inode having a change applied that's marked ATTR_KILL_PRIV
+ * affects the security markings on that inode, and if it is, should
+ * inode_killpriv() be invoked or the change rejected?
+ *
+ * Returns 0 if granted; +ve if granted, but inode_killpriv() is required; and
+ * -ve to deny the change.
+ */
int cap_inode_need_killpriv(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
@@ -192,6 +247,14 @@
return 1;
}
+/**
+ * cap_inode_killpriv - Erase the security markings on an inode
+ * @dentry: The inode/dentry to alter
+ *
+ * Erase the privilege-enhancing security markings on an inode.
+ *
+ * Returns 0 if successful, -ve on error.
+ */
int cap_inode_killpriv(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
@@ -202,19 +265,75 @@
return inode->i_op->removexattr(dentry, XATTR_NAME_CAPS);
}
-static inline int cap_from_disk(struct vfs_cap_data *caps,
- struct linux_binprm *bprm, unsigned size)
+/*
+ * Calculate the new process capability sets from the capability sets attached
+ * to a file.
+ */
+static inline int bprm_caps_from_vfs_caps(struct cpu_vfs_cap_data *caps,
+ struct linux_binprm *bprm,
+ bool *effective)
{
+ struct cred *new = bprm->cred;
+ unsigned i;
+ int ret = 0;
+
+ if (caps->magic_etc & VFS_CAP_FLAGS_EFFECTIVE)
+ *effective = true;
+
+ CAP_FOR_EACH_U32(i) {
+ __u32 permitted = caps->permitted.cap[i];
+ __u32 inheritable = caps->inheritable.cap[i];
+
+ /*
+ * pP' = (X & fP) | (pI & fI)
+ */
+ new->cap_permitted.cap[i] =
+ (new->cap_bset.cap[i] & permitted) |
+ (new->cap_inheritable.cap[i] & inheritable);
+
+ if (permitted & ~new->cap_permitted.cap[i])
+ /* insufficient to execute correctly */
+ ret = -EPERM;
+ }
+
+ /*
+ * For legacy apps, with no internal support for recognizing they
+ * do not have enough capabilities, we return an error if they are
+ * missing some "forced" (aka file-permitted) capabilities.
+ */
+ return *effective ? ret : 0;
+}
+
+/*
+ * Extract the on-exec-apply capability sets for an executable file.
+ */
+int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps)
+{
+ struct inode *inode = dentry->d_inode;
__u32 magic_etc;
unsigned tocopy, i;
- int ret;
+ int size;
+ struct vfs_cap_data caps;
+
+ memset(cpu_caps, 0, sizeof(struct cpu_vfs_cap_data));
+
+ if (!inode || !inode->i_op || !inode->i_op->getxattr)
+ return -ENODATA;
+
+ size = inode->i_op->getxattr((struct dentry *)dentry, XATTR_NAME_CAPS, &caps,
+ XATTR_CAPS_SZ);
+ if (size == -ENODATA || size == -EOPNOTSUPP)
+ /* no data, that's ok */
+ return -ENODATA;
+ if (size < 0)
+ return size;
if (size < sizeof(magic_etc))
return -EINVAL;
- magic_etc = le32_to_cpu(caps->magic_etc);
+ cpu_caps->magic_etc = magic_etc = le32_to_cpu(caps.magic_etc);
- switch ((magic_etc & VFS_CAP_REVISION_MASK)) {
+ switch (magic_etc & VFS_CAP_REVISION_MASK) {
case VFS_CAP_REVISION_1:
if (size != XATTR_CAPS_SZ_1)
return -EINVAL;
@@ -229,77 +348,48 @@
return -EINVAL;
}
- if (magic_etc & VFS_CAP_FLAGS_EFFECTIVE) {
- bprm->cap_effective = true;
- } else {
- bprm->cap_effective = false;
- }
-
- ret = 0;
-
CAP_FOR_EACH_U32(i) {
- __u32 value_cpu;
-
- if (i >= tocopy) {
- /*
- * Legacy capability sets have no upper bits
- */
- bprm->cap_post_exec_permitted.cap[i] = 0;
- continue;
- }
- /*
- * pP' = (X & fP) | (pI & fI)
- */
- value_cpu = le32_to_cpu(caps->data[i].permitted);
- bprm->cap_post_exec_permitted.cap[i] =
- (current->cap_bset.cap[i] & value_cpu) |
- (current->cap_inheritable.cap[i] &
- le32_to_cpu(caps->data[i].inheritable));
- if (value_cpu & ~bprm->cap_post_exec_permitted.cap[i]) {
- /*
- * insufficient to execute correctly
- */
- ret = -EPERM;
- }
+ if (i >= tocopy)
+ break;
+ cpu_caps->permitted.cap[i] = le32_to_cpu(caps.data[i].permitted);
+ cpu_caps->inheritable.cap[i] = le32_to_cpu(caps.data[i].inheritable);
}
- /*
- * For legacy apps, with no internal support for recognizing they
- * do not have enough capabilities, we return an error if they are
- * missing some "forced" (aka file-permitted) capabilities.
- */
- return bprm->cap_effective ? ret : 0;
+ return 0;
}
-/* Locate any VFS capabilities: */
-static int get_file_caps(struct linux_binprm *bprm)
+/*
+ * Attempt to get the on-exec apply capability sets for an executable file from
+ * its xattrs and, if present, apply them to the proposed credentials being
+ * constructed by execve().
+ */
+static int get_file_caps(struct linux_binprm *bprm, bool *effective)
{
struct dentry *dentry;
int rc = 0;
- struct vfs_cap_data vcaps;
- struct inode *inode;
+ struct cpu_vfs_cap_data vcaps;
bprm_clear_caps(bprm);
+ if (!file_caps_enabled)
+ return 0;
+
if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
return 0;
dentry = dget(bprm->file->f_dentry);
- inode = dentry->d_inode;
- if (!inode->i_op || !inode->i_op->getxattr)
- goto out;
- rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, &vcaps,
- XATTR_CAPS_SZ);
- if (rc == -ENODATA || rc == -EOPNOTSUPP) {
- /* no data, that's ok */
- rc = 0;
+ rc = get_vfs_caps_from_disk(dentry, &vcaps);
+ if (rc < 0) {
+ if (rc == -EINVAL)
+ printk(KERN_NOTICE "%s: get_vfs_caps_from_disk returned %d for %s\n",
+ __func__, rc, bprm->filename);
+ else if (rc == -ENODATA)
+ rc = 0;
goto out;
}
- if (rc < 0)
- goto out;
- rc = cap_from_disk(&vcaps, bprm, rc);
+ rc = bprm_caps_from_vfs_caps(&vcaps, bprm, effective);
if (rc == -EINVAL)
printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
__func__, rc, bprm->filename);
@@ -323,18 +413,51 @@
return 0;
}
-static inline int get_file_caps(struct linux_binprm *bprm)
+static inline int get_file_caps(struct linux_binprm *bprm, bool *effective)
{
bprm_clear_caps(bprm);
return 0;
}
#endif
-int cap_bprm_set_security (struct linux_binprm *bprm)
+/*
+ * Determine whether a exec'ing process's new permitted capabilities should be
+ * limited to just what it already has.
+ *
+ * This prevents processes that are being ptraced from gaining access to
+ * CAP_SETPCAP, unless the process they're tracing already has it, and the
+ * binary they're executing has filecaps that elevate it.
+ *
+ * Returns 1 if they should be limited, 0 if they are not.
+ */
+static inline int cap_limit_ptraced_target(void)
{
+#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
+ if (capable(CAP_SETPCAP))
+ return 0;
+#endif
+ return 1;
+}
+
+/**
+ * cap_bprm_set_creds - Set up the proposed credentials for execve().
+ * @bprm: The execution parameters, including the proposed creds
+ *
+ * Set up the proposed credentials for a new execution context being
+ * constructed by execve(). The proposed creds in @bprm->cred is altered,
+ * which won't take effect immediately. Returns 0 if successful, -ve on error.
+ */
+int cap_bprm_set_creds(struct linux_binprm *bprm)
+{
+ const struct cred *old = current_cred();
+ struct cred *new = bprm->cred;
+ bool effective;
int ret;
- ret = get_file_caps(bprm);
+ effective = false;
+ ret = get_file_caps(bprm, &effective);
+ if (ret < 0)
+ return ret;
if (!issecure(SECURE_NOROOT)) {
/*
@@ -342,75 +465,113 @@
* executables under compatibility mode, we override the
* capability sets for the file.
*
- * If only the real uid is 0, we do not set the effective
- * bit.
+ * If only the real uid is 0, we do not set the effective bit.
*/
- if (bprm->e_uid == 0 || current->uid == 0) {
+ if (new->euid == 0 || new->uid == 0) {
/* pP' = (cap_bset & ~0) | (pI & ~0) */
- bprm->cap_post_exec_permitted = cap_combine(
- current->cap_bset, current->cap_inheritable
- );
- bprm->cap_effective = (bprm->e_uid == 0);
- ret = 0;
+ new->cap_permitted = cap_combine(old->cap_bset,
+ old->cap_inheritable);
}
+ if (new->euid == 0)
+ effective = true;
}
- return ret;
-}
-
-void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
-{
- if (bprm->e_uid != current->uid || bprm->e_gid != current->gid ||
- !cap_issubset(bprm->cap_post_exec_permitted,
- current->cap_permitted)) {
- set_dumpable(current->mm, suid_dumpable);
- current->pdeath_signal = 0;
-
- if (unsafe & ~LSM_UNSAFE_PTRACE_CAP) {
- if (!capable(CAP_SETUID)) {
- bprm->e_uid = current->uid;
- bprm->e_gid = current->gid;
- }
- if (cap_limit_ptraced_target()) {
- bprm->cap_post_exec_permitted = cap_intersect(
- bprm->cap_post_exec_permitted,
- current->cap_permitted);
- }
+ /* Don't let someone trace a set[ug]id/setpcap binary with the revised
+ * credentials unless they have the appropriate permit
+ */
+ if ((new->euid != old->uid ||
+ new->egid != old->gid ||
+ !cap_issubset(new->cap_permitted, old->cap_permitted)) &&
+ bprm->unsafe & ~LSM_UNSAFE_PTRACE_CAP) {
+ /* downgrade; they get no more than they had, and maybe less */
+ if (!capable(CAP_SETUID)) {
+ new->euid = new->uid;
+ new->egid = new->gid;
}
+ if (cap_limit_ptraced_target())
+ new->cap_permitted = cap_intersect(new->cap_permitted,
+ old->cap_permitted);
}
- current->suid = current->euid = current->fsuid = bprm->e_uid;
- current->sgid = current->egid = current->fsgid = bprm->e_gid;
+ new->suid = new->fsuid = new->euid;
+ new->sgid = new->fsgid = new->egid;
- /* For init, we want to retain the capabilities set
- * in the init_task struct. Thus we skip the usual
- * capability rules */
+ /* For init, we want to retain the capabilities set in the initial
+ * task. Thus we skip the usual capability rules
+ */
if (!is_global_init(current)) {
- current->cap_permitted = bprm->cap_post_exec_permitted;
- if (bprm->cap_effective)
- current->cap_effective = bprm->cap_post_exec_permitted;
+ if (effective)
+ new->cap_effective = new->cap_permitted;
else
- cap_clear(current->cap_effective);
+ cap_clear(new->cap_effective);
+ }
+ bprm->cap_effective = effective;
+
+ /*
+ * Audit candidate if current->cap_effective is set
+ *
+ * We do not bother to audit if 3 things are true:
+ * 1) cap_effective has all caps
+ * 2) we are root
+ * 3) root is supposed to have all caps (SECURE_NOROOT)
+ * Since this is just a normal root execing a process.
+ *
+ * Number 1 above might fail if you don't have a full bset, but I think
+ * that is interesting information to audit.
+ */
+ if (!cap_isclear(new->cap_effective)) {
+ if (!cap_issubset(CAP_FULL_SET, new->cap_effective) ||
+ new->euid != 0 || new->uid != 0 ||
+ issecure(SECURE_NOROOT)) {
+ ret = audit_log_bprm_fcaps(bprm, new, old);
+ if (ret < 0)
+ return ret;
+ }
}
- /* AUD: Audit candidate if current->cap_effective is set */
-
- current->securebits &= ~issecure_mask(SECURE_KEEP_CAPS);
+ new->securebits &= ~issecure_mask(SECURE_KEEP_CAPS);
+ return 0;
}
-int cap_bprm_secureexec (struct linux_binprm *bprm)
+/**
+ * cap_bprm_secureexec - Determine whether a secure execution is required
+ * @bprm: The execution parameters
+ *
+ * Determine whether a secure execution is required, return 1 if it is, and 0
+ * if it is not.
+ *
+ * The credentials have been committed by this point, and so are no longer
+ * available through @bprm->cred.
+ */
+int cap_bprm_secureexec(struct linux_binprm *bprm)
{
- if (current->uid != 0) {
+ const struct cred *cred = current_cred();
+
+ if (cred->uid != 0) {
if (bprm->cap_effective)
return 1;
- if (!cap_isclear(bprm->cap_post_exec_permitted))
+ if (!cap_isclear(cred->cap_permitted))
return 1;
}
- return (current->euid != current->uid ||
- current->egid != current->gid);
+ return (cred->euid != cred->uid ||
+ cred->egid != cred->gid);
}
+/**
+ * cap_inode_setxattr - Determine whether an xattr may be altered
+ * @dentry: The inode/dentry being altered
+ * @name: The name of the xattr to be changed
+ * @value: The value that the xattr will be changed to
+ * @size: The size of value
+ * @flags: The replacement flag
+ *
+ * Determine whether an xattr may be altered or set on an inode, returning 0 if
+ * permission is granted, -ve if denied.
+ *
+ * This is used to make sure security xattrs don't get updated or set by those
+ * who aren't privileged to do so.
+ */
int cap_inode_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
@@ -418,28 +579,42 @@
if (!capable(CAP_SETFCAP))
return -EPERM;
return 0;
- } else if (!strncmp(name, XATTR_SECURITY_PREFIX,
+ }
+
+ if (!strncmp(name, XATTR_SECURITY_PREFIX,
sizeof(XATTR_SECURITY_PREFIX) - 1) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
+/**
+ * cap_inode_removexattr - Determine whether an xattr may be removed
+ * @dentry: The inode/dentry being altered
+ * @name: The name of the xattr to be changed
+ *
+ * Determine whether an xattr may be removed from an inode, returning 0 if
+ * permission is granted, -ve if denied.
+ *
+ * This is used to make sure security xattrs don't get removed by those who
+ * aren't privileged to remove them.
+ */
int cap_inode_removexattr(struct dentry *dentry, const char *name)
{
if (!strcmp(name, XATTR_NAME_CAPS)) {
if (!capable(CAP_SETFCAP))
return -EPERM;
return 0;
- } else if (!strncmp(name, XATTR_SECURITY_PREFIX,
+ }
+
+ if (!strncmp(name, XATTR_SECURITY_PREFIX,
sizeof(XATTR_SECURITY_PREFIX) - 1) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
-/* moved from kernel/sys.c. */
-/*
+/*
* cap_emulate_setxuid() fixes the effective / permitted capabilities of
* a process after a call to setuid, setreuid, or setresuid.
*
@@ -453,10 +628,10 @@
* 3) When set*uiding _from_ euid != 0 _to_ euid == 0, the effective
* capabilities are set to the permitted capabilities.
*
- * fsuid is handled elsewhere. fsuid == 0 and {r,e,s}uid!= 0 should
+ * fsuid is handled elsewhere. fsuid == 0 and {r,e,s}uid!= 0 should
* never happen.
*
- * -astor
+ * -astor
*
* cevans - New behaviour, Oct '99
* A process may, via prctl(), elect to keep its capabilities when it
@@ -468,61 +643,60 @@
* files..
* Thanks to Olaf Kirch and Peter Benie for spotting this.
*/
-static inline void cap_emulate_setxuid (int old_ruid, int old_euid,
- int old_suid)
+static inline void cap_emulate_setxuid(struct cred *new, const struct cred *old)
{
- if ((old_ruid == 0 || old_euid == 0 || old_suid == 0) &&
- (current->uid != 0 && current->euid != 0 && current->suid != 0) &&
+ if ((old->uid == 0 || old->euid == 0 || old->suid == 0) &&
+ (new->uid != 0 && new->euid != 0 && new->suid != 0) &&
!issecure(SECURE_KEEP_CAPS)) {
- cap_clear (current->cap_permitted);
- cap_clear (current->cap_effective);
+ cap_clear(new->cap_permitted);
+ cap_clear(new->cap_effective);
}
- if (old_euid == 0 && current->euid != 0) {
- cap_clear (current->cap_effective);
- }
- if (old_euid != 0 && current->euid == 0) {
- current->cap_effective = current->cap_permitted;
- }
+ if (old->euid == 0 && new->euid != 0)
+ cap_clear(new->cap_effective);
+ if (old->euid != 0 && new->euid == 0)
+ new->cap_effective = new->cap_permitted;
}
-int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid,
- int flags)
+/**
+ * cap_task_fix_setuid - Fix up the results of setuid() call
+ * @new: The proposed credentials
+ * @old: The current task's current credentials
+ * @flags: Indications of what has changed
+ *
+ * Fix up the results of setuid() call before the credential changes are
+ * actually applied, returning 0 to grant the changes, -ve to deny them.
+ */
+int cap_task_fix_setuid(struct cred *new, const struct cred *old, int flags)
{
switch (flags) {
case LSM_SETID_RE:
case LSM_SETID_ID:
case LSM_SETID_RES:
- /* Copied from kernel/sys.c:setreuid/setuid/setresuid. */
- if (!issecure (SECURE_NO_SETUID_FIXUP)) {
- cap_emulate_setxuid (old_ruid, old_euid, old_suid);
+ /* juggle the capabilities to follow [RES]UID changes unless
+ * otherwise suppressed */
+ if (!issecure(SECURE_NO_SETUID_FIXUP))
+ cap_emulate_setxuid(new, old);
+ break;
+
+ case LSM_SETID_FS:
+ /* juggle the capabilties to follow FSUID changes, unless
+ * otherwise suppressed
+ *
+ * FIXME - is fsuser used for all CAP_FS_MASK capabilities?
+ * if not, we might be a bit too harsh here.
+ */
+ if (!issecure(SECURE_NO_SETUID_FIXUP)) {
+ if (old->fsuid == 0 && new->fsuid != 0)
+ new->cap_effective =
+ cap_drop_fs_set(new->cap_effective);
+
+ if (old->fsuid != 0 && new->fsuid == 0)
+ new->cap_effective =
+ cap_raise_fs_set(new->cap_effective,
+ new->cap_permitted);
}
break;
- case LSM_SETID_FS:
- {
- uid_t old_fsuid = old_ruid;
- /* Copied from kernel/sys.c:setfsuid. */
-
- /*
- * FIXME - is fsuser used for all CAP_FS_MASK capabilities?
- * if not, we might be a bit too harsh here.
- */
-
- if (!issecure (SECURE_NO_SETUID_FIXUP)) {
- if (old_fsuid == 0 && current->fsuid != 0) {
- current->cap_effective =
- cap_drop_fs_set(
- current->cap_effective);
- }
- if (old_fsuid != 0 && current->fsuid == 0) {
- current->cap_effective =
- cap_raise_fs_set(
- current->cap_effective,
- current->cap_permitted);
- }
- }
- break;
- }
default:
return -EINVAL;
}
@@ -543,42 +717,71 @@
*/
static int cap_safe_nice(struct task_struct *p)
{
- if (!cap_issubset(p->cap_permitted, current->cap_permitted) &&
- !capable(CAP_SYS_NICE))
+ int is_subset;
+
+ rcu_read_lock();
+ is_subset = cap_issubset(__task_cred(p)->cap_permitted,
+ current_cred()->cap_permitted);
+ rcu_read_unlock();
+
+ if (!is_subset && !capable(CAP_SYS_NICE))
return -EPERM;
return 0;
}
-int cap_task_setscheduler (struct task_struct *p, int policy,
+/**
+ * cap_task_setscheduler - Detemine if scheduler policy change is permitted
+ * @p: The task to affect
+ * @policy: The policy to effect
+ * @lp: The parameters to the scheduling policy
+ *
+ * Detemine if the requested scheduler policy change is permitted for the
+ * specified task, returning 0 if permission is granted, -ve if denied.
+ */
+int cap_task_setscheduler(struct task_struct *p, int policy,
struct sched_param *lp)
{
return cap_safe_nice(p);
}
-int cap_task_setioprio (struct task_struct *p, int ioprio)
+/**
+ * cap_task_ioprio - Detemine if I/O priority change is permitted
+ * @p: The task to affect
+ * @ioprio: The I/O priority to set
+ *
+ * Detemine if the requested I/O priority change is permitted for the specified
+ * task, returning 0 if permission is granted, -ve if denied.
+ */
+int cap_task_setioprio(struct task_struct *p, int ioprio)
{
return cap_safe_nice(p);
}
-int cap_task_setnice (struct task_struct *p, int nice)
+/**
+ * cap_task_ioprio - Detemine if task priority change is permitted
+ * @p: The task to affect
+ * @nice: The nice value to set
+ *
+ * Detemine if the requested task priority change is permitted for the
+ * specified task, returning 0 if permission is granted, -ve if denied.
+ */
+int cap_task_setnice(struct task_struct *p, int nice)
{
return cap_safe_nice(p);
}
/*
- * called from kernel/sys.c for prctl(PR_CABSET_DROP)
- * done without task_capability_lock() because it introduces
- * no new races - i.e. only another task doing capget() on
- * this task could get inconsistent info. There can be no
- * racing writer bc a task can only change its own caps.
+ * Implement PR_CAPBSET_DROP. Attempt to remove the specified capability from
+ * the current task's bounding set. Returns 0 on success, -ve on error.
*/
-static long cap_prctl_drop(unsigned long cap)
+static long cap_prctl_drop(struct cred *new, unsigned long cap)
{
if (!capable(CAP_SETPCAP))
return -EPERM;
if (!cap_valid(cap))
return -EINVAL;
- cap_lower(current->cap_bset, cap);
+
+ cap_lower(new->cap_bset, cap);
return 0;
}
@@ -598,22 +801,42 @@
}
#endif
+/**
+ * cap_task_prctl - Implement process control functions for this security module
+ * @option: The process control function requested
+ * @arg2, @arg3, @arg4, @arg5: The argument data for this function
+ *
+ * Allow process control functions (sys_prctl()) to alter capabilities; may
+ * also deny access to other functions not otherwise implemented here.
+ *
+ * Returns 0 or +ve on success, -ENOSYS if this function is not implemented
+ * here, other -ve on error. If -ENOSYS is returned, sys_prctl() and other LSM
+ * modules will consider performing the function.
+ */
int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
- unsigned long arg4, unsigned long arg5, long *rc_p)
+ unsigned long arg4, unsigned long arg5)
{
+ struct cred *new;
long error = 0;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
switch (option) {
case PR_CAPBSET_READ:
+ error = -EINVAL;
if (!cap_valid(arg2))
- error = -EINVAL;
- else
- error = !!cap_raised(current->cap_bset, arg2);
- break;
+ goto error;
+ error = !!cap_raised(new->cap_bset, arg2);
+ goto no_change;
+
#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
case PR_CAPBSET_DROP:
- error = cap_prctl_drop(arg2);
- break;
+ error = cap_prctl_drop(new, arg2);
+ if (error < 0)
+ goto error;
+ goto changed;
/*
* The next four prctl's remain to assist with transitioning a
@@ -635,12 +858,12 @@
* capability-based-privilege environment.
*/
case PR_SET_SECUREBITS:
- if ((((current->securebits & SECURE_ALL_LOCKS) >> 1)
- & (current->securebits ^ arg2)) /*[1]*/
- || ((current->securebits & SECURE_ALL_LOCKS
- & ~arg2)) /*[2]*/
- || (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/
- || (cap_capable(current, CAP_SETPCAP) != 0)) { /*[4]*/
+ error = -EPERM;
+ if ((((new->securebits & SECURE_ALL_LOCKS) >> 1)
+ & (new->securebits ^ arg2)) /*[1]*/
+ || ((new->securebits & SECURE_ALL_LOCKS & ~arg2)) /*[2]*/
+ || (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/
+ || (cap_capable(current, CAP_SETPCAP, SECURITY_CAP_AUDIT) != 0) /*[4]*/
/*
* [1] no changing of bits that are locked
* [2] no unlocking of locks
@@ -648,65 +871,80 @@
* [4] doing anything requires privilege (go read about
* the "sendmail capabilities bug")
*/
- error = -EPERM; /* cannot change a locked bit */
- } else {
- current->securebits = arg2;
- }
- break;
+ )
+ /* cannot change a locked bit */
+ goto error;
+ new->securebits = arg2;
+ goto changed;
+
case PR_GET_SECUREBITS:
- error = current->securebits;
- break;
+ error = new->securebits;
+ goto no_change;
#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
case PR_GET_KEEPCAPS:
if (issecure(SECURE_KEEP_CAPS))
error = 1;
- break;
+ goto no_change;
+
case PR_SET_KEEPCAPS:
+ error = -EINVAL;
if (arg2 > 1) /* Note, we rely on arg2 being unsigned here */
- error = -EINVAL;
- else if (issecure(SECURE_KEEP_CAPS_LOCKED))
- error = -EPERM;
- else if (arg2)
- current->securebits |= issecure_mask(SECURE_KEEP_CAPS);
+ goto error;
+ error = -EPERM;
+ if (issecure(SECURE_KEEP_CAPS_LOCKED))
+ goto error;
+ if (arg2)
+ new->securebits |= issecure_mask(SECURE_KEEP_CAPS);
else
- current->securebits &=
- ~issecure_mask(SECURE_KEEP_CAPS);
- break;
+ new->securebits &= ~issecure_mask(SECURE_KEEP_CAPS);
+ goto changed;
default:
/* No functionality available - continue with default */
- return 0;
+ error = -ENOSYS;
+ goto error;
}
/* Functionality provided */
- *rc_p = error;
- return 1;
+changed:
+ return commit_creds(new);
+
+no_change:
+ error = 0;
+error:
+ abort_creds(new);
+ return error;
}
-void cap_task_reparent_to_init (struct task_struct *p)
-{
- cap_set_init_eff(p->cap_effective);
- cap_clear(p->cap_inheritable);
- cap_set_full(p->cap_permitted);
- p->securebits = SECUREBITS_DEFAULT;
- return;
-}
-
-int cap_syslog (int type)
+/**
+ * cap_syslog - Determine whether syslog function is permitted
+ * @type: Function requested
+ *
+ * Determine whether the current process is permitted to use a particular
+ * syslog function, returning 0 if permission is granted, -ve if not.
+ */
+int cap_syslog(int type)
{
if ((type != 3 && type != 10) && !capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
+/**
+ * cap_vm_enough_memory - Determine whether a new virtual mapping is permitted
+ * @mm: The VM space in which the new mapping is to be made
+ * @pages: The size of the mapping
+ *
+ * Determine whether the allocation of a new virtual mapping by the current
+ * task is permitted, returning 0 if permission is granted, -ve if not.
+ */
int cap_vm_enough_memory(struct mm_struct *mm, long pages)
{
int cap_sys_admin = 0;
- if (cap_capable(current, CAP_SYS_ADMIN) == 0)
+ if (cap_capable(current, CAP_SYS_ADMIN, SECURITY_CAP_NOAUDIT) == 0)
cap_sys_admin = 1;
return __vm_enough_memory(mm, pages, cap_sys_admin);
}
-
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 239098f..81932ab 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -12,8 +12,8 @@
#ifndef _INTERNAL_H
#define _INTERNAL_H
+#include <linux/sched.h>
#include <linux/key-type.h>
-#include <linux/key-ui.h>
static inline __attribute__((format(printf, 1, 2)))
void no_printk(const char *fmt, ...)
@@ -26,7 +26,7 @@
#define kleave(FMT, ...) \
printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
#define kdebug(FMT, ...) \
- printk(KERN_DEBUG "xxx" FMT"yyy\n", ##__VA_ARGS__)
+ printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
#else
#define kenter(FMT, ...) \
no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
@@ -82,6 +82,9 @@
extern wait_queue_head_t request_key_conswq;
+extern struct key_type *key_type_lookup(const char *type);
+extern void key_type_put(struct key_type *ktype);
+
extern int __key_link(struct key *keyring, struct key *key);
extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
@@ -95,7 +98,7 @@
typedef int (*key_match_func_t)(const struct key *, const void *);
extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
- struct task_struct *tsk,
+ const struct cred *cred,
struct key_type *type,
const void *description,
key_match_func_t match);
@@ -103,13 +106,13 @@
extern key_ref_t search_process_keyrings(struct key_type *type,
const void *description,
key_match_func_t match,
- struct task_struct *tsk);
+ const struct cred *cred);
extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
-extern int install_user_keyrings(struct task_struct *tsk);
-extern int install_thread_keyring(struct task_struct *tsk);
-extern int install_process_keyring(struct task_struct *tsk);
+extern int install_user_keyrings(void);
+extern int install_thread_keyring_to_cred(struct cred *);
+extern int install_process_keyring_to_cred(struct cred *);
extern struct key *request_key_and_link(struct key_type *type,
const char *description,
@@ -119,12 +122,39 @@
struct key *dest_keyring,
unsigned long flags);
+extern key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
+ key_perm_t perm);
+
+extern long join_session_keyring(const char *name);
+
+/*
+ * check to see whether permission is granted to use a key in the desired way
+ */
+extern int key_task_permission(const key_ref_t key_ref,
+ const struct cred *cred,
+ key_perm_t perm);
+
+static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
+{
+ return key_task_permission(key_ref, current_cred(), perm);
+}
+
+/* required permissions */
+#define KEY_VIEW 0x01 /* require permission to view attributes */
+#define KEY_READ 0x02 /* require permission to read content */
+#define KEY_WRITE 0x04 /* require permission to update / modify */
+#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
+#define KEY_LINK 0x10 /* require permission to link */
+#define KEY_SETATTR 0x20 /* require permission to change attributes */
+#define KEY_ALL 0x3f /* all the above permissions */
+
/*
* request_key authorisation
*/
struct request_key_auth {
struct key *target_key;
- struct task_struct *context;
+ struct key *dest_keyring;
+ const struct cred *cred;
void *callout_info;
size_t callout_len;
pid_t pid;
@@ -133,7 +163,8 @@
extern struct key_type key_type_request_key_auth;
extern struct key *request_key_auth_new(struct key *target,
const void *callout_info,
- size_t callout_len);
+ size_t callout_len,
+ struct key *dest_keyring);
extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
diff --git a/security/keys/key.c b/security/keys/key.c
index 14948cf..f76c8a5 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -218,7 +218,7 @@
* instantiate the key or discard it before returning
*/
struct key *key_alloc(struct key_type *type, const char *desc,
- uid_t uid, gid_t gid, struct task_struct *ctx,
+ uid_t uid, gid_t gid, const struct cred *cred,
key_perm_t perm, unsigned long flags)
{
struct key_user *user = NULL;
@@ -294,7 +294,7 @@
#endif
/* let the security module know about the key */
- ret = security_key_alloc(key, ctx, flags);
+ ret = security_key_alloc(key, cred, flags);
if (ret < 0)
goto security_error;
@@ -391,7 +391,7 @@
const void *data,
size_t datalen,
struct key *keyring,
- struct key *instkey)
+ struct key *authkey)
{
int ret, awaken;
@@ -421,8 +421,8 @@
ret = __key_link(keyring, key);
/* disable the authorisation key */
- if (instkey)
- key_revoke(instkey);
+ if (authkey)
+ key_revoke(authkey);
}
}
@@ -444,14 +444,14 @@
const void *data,
size_t datalen,
struct key *keyring,
- struct key *instkey)
+ struct key *authkey)
{
int ret;
if (keyring)
down_write(&keyring->sem);
- ret = __key_instantiate_and_link(key, data, datalen, keyring, instkey);
+ ret = __key_instantiate_and_link(key, data, datalen, keyring, authkey);
if (keyring)
up_write(&keyring->sem);
@@ -469,7 +469,7 @@
int key_negate_and_link(struct key *key,
unsigned timeout,
struct key *keyring,
- struct key *instkey)
+ struct key *authkey)
{
struct timespec now;
int ret, awaken;
@@ -504,8 +504,8 @@
ret = __key_link(keyring, key);
/* disable the authorisation key */
- if (instkey)
- key_revoke(instkey);
+ if (authkey)
+ key_revoke(authkey);
}
mutex_unlock(&key_construction_mutex);
@@ -743,6 +743,7 @@
key_perm_t perm,
unsigned long flags)
{
+ const struct cred *cred = current_cred();
struct key_type *ktype;
struct key *keyring, *key = NULL;
key_ref_t key_ref;
@@ -802,8 +803,8 @@
}
/* allocate a new key */
- key = key_alloc(ktype, description, current->fsuid, current->fsgid,
- current, perm, flags);
+ key = key_alloc(ktype, description, cred->fsuid, cred->fsgid, cred,
+ perm, flags);
if (IS_ERR(key)) {
key_ref = ERR_CAST(key);
goto error_3;
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index acc9c89..7c72baa 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -103,7 +103,7 @@
}
/* find the target keyring (which must be writable) */
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error3;
@@ -185,7 +185,7 @@
/* get the destination keyring if specified */
dest_ref = NULL;
if (destringid) {
- dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
+ dest_ref = lookup_user_key(destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@@ -235,7 +235,7 @@
key_ref_t key_ref;
long ret;
- key_ref = lookup_user_key(NULL, id, create, 0, KEY_SEARCH);
+ key_ref = lookup_user_key(id, create, 0, KEY_SEARCH);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -308,7 +308,7 @@
}
/* find the target key (which must be writable) */
- key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
+ key_ref = lookup_user_key(id, 0, 0, KEY_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -336,7 +336,7 @@
key_ref_t key_ref;
long ret;
- key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
+ key_ref = lookup_user_key(id, 0, 0, KEY_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -362,7 +362,7 @@
key_ref_t keyring_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
@@ -388,13 +388,13 @@
key_ref_t keyring_ref, key_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
- key_ref = lookup_user_key(NULL, id, 1, 0, KEY_LINK);
+ key_ref = lookup_user_key(id, 1, 0, KEY_LINK);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -422,13 +422,13 @@
key_ref_t keyring_ref, key_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 0, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
- key_ref = lookup_user_key(NULL, id, 0, 0, 0);
+ key_ref = lookup_user_key(id, 0, 0, 0);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -464,7 +464,7 @@
char *tmpbuf;
long ret;
- key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
+ key_ref = lookup_user_key(keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key_ref)) {
/* viewing a key under construction is permitted if we have the
* authorisation token handy */
@@ -472,7 +472,7 @@
instkey = key_get_instantiation_authkey(keyid);
if (!IS_ERR(instkey)) {
key_put(instkey);
- key_ref = lookup_user_key(NULL, keyid,
+ key_ref = lookup_user_key(keyid,
0, 1, 0);
if (!IS_ERR(key_ref))
goto okay;
@@ -557,7 +557,7 @@
}
/* get the keyring at which to begin the search */
- keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_SEARCH);
+ keyring_ref = lookup_user_key(ringid, 0, 0, KEY_SEARCH);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error2;
@@ -566,7 +566,7 @@
/* get the destination keyring if specified */
dest_ref = NULL;
if (destringid) {
- dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
+ dest_ref = lookup_user_key(destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@@ -636,7 +636,7 @@
long ret;
/* find the key first */
- key_ref = lookup_user_key(NULL, keyid, 0, 0, 0);
+ key_ref = lookup_user_key(keyid, 0, 0, 0);
if (IS_ERR(key_ref)) {
ret = -ENOKEY;
goto error;
@@ -699,7 +699,7 @@
if (uid == (uid_t) -1 && gid == (gid_t) -1)
goto error;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -804,7 +804,7 @@
if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
goto error;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -817,7 +817,7 @@
down_write(&key->sem);
/* if we're not the sysadmin, we can only change a key that we own */
- if (capable(CAP_SYS_ADMIN) || key->uid == current->fsuid) {
+ if (capable(CAP_SYS_ADMIN) || key->uid == current_fsuid()) {
key->perm = perm;
ret = 0;
}
@@ -829,6 +829,60 @@
} /* end keyctl_setperm_key() */
+/*
+ * get the destination keyring for instantiation
+ */
+static long get_instantiation_keyring(key_serial_t ringid,
+ struct request_key_auth *rka,
+ struct key **_dest_keyring)
+{
+ key_ref_t dkref;
+
+ /* just return a NULL pointer if we weren't asked to make a link */
+ if (ringid == 0) {
+ *_dest_keyring = NULL;
+ return 0;
+ }
+
+ /* if a specific keyring is nominated by ID, then use that */
+ if (ringid > 0) {
+ dkref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ if (IS_ERR(dkref))
+ return PTR_ERR(dkref);
+ *_dest_keyring = key_ref_to_ptr(dkref);
+ return 0;
+ }
+
+ if (ringid == KEY_SPEC_REQKEY_AUTH_KEY)
+ return -EINVAL;
+
+ /* otherwise specify the destination keyring recorded in the
+ * authorisation key (any KEY_SPEC_*_KEYRING) */
+ if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) {
+ *_dest_keyring = rka->dest_keyring;
+ return 0;
+ }
+
+ return -ENOKEY;
+}
+
+/*
+ * change the request_key authorisation key on the current process
+ */
+static int keyctl_change_reqkey_auth(struct key *key)
+{
+ struct cred *new;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ key_put(new->request_key_auth);
+ new->request_key_auth = key_get(key);
+
+ return commit_creds(new);
+}
+
/*****************************************************************************/
/*
* instantiate the key with the specified payload, and, if one is given, link
@@ -839,13 +893,15 @@
size_t plen,
key_serial_t ringid)
{
+ const struct cred *cred = current_cred();
struct request_key_auth *rka;
- struct key *instkey;
- key_ref_t keyring_ref;
+ struct key *instkey, *dest_keyring;
void *payload;
long ret;
bool vm = false;
+ kenter("%d,,%zu,%d", id, plen, ringid);
+
ret = -EINVAL;
if (plen > 1024 * 1024 - 1)
goto error;
@@ -853,7 +909,7 @@
/* the appropriate instantiation authorisation key must have been
* assumed before calling this */
ret = -EPERM;
- instkey = current->request_key_auth;
+ instkey = cred->request_key_auth;
if (!instkey)
goto error;
@@ -883,28 +939,20 @@
/* find the destination keyring amongst those belonging to the
* requesting task */
- keyring_ref = NULL;
- if (ringid) {
- keyring_ref = lookup_user_key(rka->context, ringid, 1, 0,
- KEY_WRITE);
- if (IS_ERR(keyring_ref)) {
- ret = PTR_ERR(keyring_ref);
- goto error2;
- }
- }
+ ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
+ if (ret < 0)
+ goto error2;
/* instantiate the key and link it into a keyring */
ret = key_instantiate_and_link(rka->target_key, payload, plen,
- key_ref_to_ptr(keyring_ref), instkey);
+ dest_keyring, instkey);
- key_ref_put(keyring_ref);
+ key_put(dest_keyring);
/* discard the assumed authority if it's just been disabled by
* instantiation of the key */
- if (ret == 0) {
- key_put(current->request_key_auth);
- current->request_key_auth = NULL;
- }
+ if (ret == 0)
+ keyctl_change_reqkey_auth(NULL);
error2:
if (!vm)
@@ -923,15 +971,17 @@
*/
long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
{
+ const struct cred *cred = current_cred();
struct request_key_auth *rka;
- struct key *instkey;
- key_ref_t keyring_ref;
+ struct key *instkey, *dest_keyring;
long ret;
+ kenter("%d,%u,%d", id, timeout, ringid);
+
/* the appropriate instantiation authorisation key must have been
* assumed before calling this */
ret = -EPERM;
- instkey = current->request_key_auth;
+ instkey = cred->request_key_auth;
if (!instkey)
goto error;
@@ -941,27 +991,20 @@
/* find the destination keyring if present (which must also be
* writable) */
- keyring_ref = NULL;
- if (ringid) {
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
- if (IS_ERR(keyring_ref)) {
- ret = PTR_ERR(keyring_ref);
- goto error;
- }
- }
+ ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
+ if (ret < 0)
+ goto error;
/* instantiate the key and link it into a keyring */
ret = key_negate_and_link(rka->target_key, timeout,
- key_ref_to_ptr(keyring_ref), instkey);
+ dest_keyring, instkey);
- key_ref_put(keyring_ref);
+ key_put(dest_keyring);
/* discard the assumed authority if it's just been disabled by
* instantiation of the key */
- if (ret == 0) {
- key_put(current->request_key_auth);
- current->request_key_auth = NULL;
- }
+ if (ret == 0)
+ keyctl_change_reqkey_auth(NULL);
error:
return ret;
@@ -975,35 +1018,56 @@
*/
long keyctl_set_reqkey_keyring(int reqkey_defl)
{
- int ret;
+ struct cred *new;
+ int ret, old_setting;
+
+ old_setting = current_cred_xxx(jit_keyring);
+
+ if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE)
+ return old_setting;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
switch (reqkey_defl) {
case KEY_REQKEY_DEFL_THREAD_KEYRING:
- ret = install_thread_keyring(current);
+ ret = install_thread_keyring_to_cred(new);
if (ret < 0)
- return ret;
+ goto error;
goto set;
case KEY_REQKEY_DEFL_PROCESS_KEYRING:
- ret = install_process_keyring(current);
- if (ret < 0)
- return ret;
+ ret = install_process_keyring_to_cred(new);
+ if (ret < 0) {
+ if (ret != -EEXIST)
+ goto error;
+ ret = 0;
+ }
+ goto set;
case KEY_REQKEY_DEFL_DEFAULT:
case KEY_REQKEY_DEFL_SESSION_KEYRING:
case KEY_REQKEY_DEFL_USER_KEYRING:
case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
- set:
- current->jit_keyring = reqkey_defl;
+ case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
+ goto set;
case KEY_REQKEY_DEFL_NO_CHANGE:
- return current->jit_keyring;
-
case KEY_REQKEY_DEFL_GROUP_KEYRING:
default:
- return -EINVAL;
+ ret = -EINVAL;
+ goto error;
}
+set:
+ new->jit_keyring = reqkey_defl;
+ commit_creds(new);
+ return old_setting;
+error:
+ abort_creds(new);
+ return -EINVAL;
+
} /* end keyctl_set_reqkey_keyring() */
/*****************************************************************************/
@@ -1018,7 +1082,7 @@
time_t expiry;
long ret;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -1062,9 +1126,7 @@
/* we divest ourselves of authority if given an ID of 0 */
if (id == 0) {
- key_put(current->request_key_auth);
- current->request_key_auth = NULL;
- ret = 0;
+ ret = keyctl_change_reqkey_auth(NULL);
goto error;
}
@@ -1079,10 +1141,12 @@
goto error;
}
- key_put(current->request_key_auth);
- current->request_key_auth = authkey;
- ret = authkey->serial;
+ ret = keyctl_change_reqkey_auth(authkey);
+ if (ret < 0)
+ goto error;
+ key_put(authkey);
+ ret = authkey->serial;
error:
return ret;
@@ -1105,7 +1169,7 @@
char *context;
long ret;
- key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
+ key_ref = lookup_user_key(keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key_ref)) {
if (PTR_ERR(key_ref) != -EACCES)
return PTR_ERR(key_ref);
@@ -1117,7 +1181,7 @@
return PTR_ERR(key_ref);
key_put(instkey);
- key_ref = lookup_user_key(NULL, keyid, 0, 1, 0);
+ key_ref = lookup_user_key(keyid, 0, 1, 0);
if (IS_ERR(key_ref))
return PTR_ERR(key_ref);
}
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index a9ab8af..ed85157 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -16,6 +16,7 @@
#include <linux/security.h>
#include <linux/seq_file.h>
#include <linux/err.h>
+#include <keys/keyring-type.h>
#include <asm/uaccess.h>
#include "internal.h"
@@ -244,14 +245,14 @@
* allocate a keyring and link into the destination keyring
*/
struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
- struct task_struct *ctx, unsigned long flags,
+ const struct cred *cred, unsigned long flags,
struct key *dest)
{
struct key *keyring;
int ret;
keyring = key_alloc(&key_type_keyring, description,
- uid, gid, ctx,
+ uid, gid, cred,
(KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
flags);
@@ -280,7 +281,7 @@
* - we propagate the possession attribute from the keyring ref to the key ref
*/
key_ref_t keyring_search_aux(key_ref_t keyring_ref,
- struct task_struct *context,
+ const struct cred *cred,
struct key_type *type,
const void *description,
key_match_func_t match)
@@ -303,7 +304,7 @@
key_check(keyring);
/* top keyring must have search permission to begin the search */
- err = key_task_permission(keyring_ref, context, KEY_SEARCH);
+ err = key_task_permission(keyring_ref, cred, KEY_SEARCH);
if (err < 0) {
key_ref = ERR_PTR(err);
goto error;
@@ -376,7 +377,7 @@
/* key must have search permissions */
if (key_task_permission(make_key_ref(key, possessed),
- context, KEY_SEARCH) < 0)
+ cred, KEY_SEARCH) < 0)
continue;
/* we set a different error code if we pass a negative key */
@@ -403,7 +404,7 @@
continue;
if (key_task_permission(make_key_ref(key, possessed),
- context, KEY_SEARCH) < 0)
+ cred, KEY_SEARCH) < 0)
continue;
/* stack the current position */
@@ -458,7 +459,7 @@
if (!type->match)
return ERR_PTR(-ENOKEY);
- return keyring_search_aux(keyring, current,
+ return keyring_search_aux(keyring, current->cred,
type, description, type->match);
} /* end keyring_search() */
diff --git a/security/keys/permission.c b/security/keys/permission.c
index 3b41f9b..5d9fc7b 100644
--- a/security/keys/permission.c
+++ b/security/keys/permission.c
@@ -14,12 +14,19 @@
#include "internal.h"
/*****************************************************************************/
-/*
- * check to see whether permission is granted to use a key in the desired way,
- * but permit the security modules to override
+/**
+ * key_task_permission - Check a key can be used
+ * @key_ref: The key to check
+ * @cred: The credentials to use
+ * @perm: The permissions to check for
+ *
+ * Check to see whether permission is granted to use a key in the desired way,
+ * but permit the security modules to override.
+ *
+ * The caller must hold either a ref on cred or must hold the RCU readlock or a
+ * spinlock.
*/
-int key_task_permission(const key_ref_t key_ref,
- struct task_struct *context,
+int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
key_perm_t perm)
{
struct key *key;
@@ -29,7 +36,7 @@
key = key_ref_to_ptr(key_ref);
/* use the second 8-bits of permissions for keys the caller owns */
- if (key->uid == context->fsuid) {
+ if (key->uid == cred->fsuid) {
kperm = key->perm >> 16;
goto use_these_perms;
}
@@ -37,15 +44,12 @@
/* use the third 8-bits of permissions for keys the caller has a group
* membership in common with */
if (key->gid != -1 && key->perm & KEY_GRP_ALL) {
- if (key->gid == context->fsgid) {
+ if (key->gid == cred->fsgid) {
kperm = key->perm >> 8;
goto use_these_perms;
}
- task_lock(context);
- ret = groups_search(context->group_info, key->gid);
- task_unlock(context);
-
+ ret = groups_search(cred->group_info, key->gid);
if (ret) {
kperm = key->perm >> 8;
goto use_these_perms;
@@ -56,6 +60,7 @@
kperm = key->perm;
use_these_perms:
+
/* use the top 8-bits of permissions for keys the caller possesses
* - possessor permissions are additive with other permissions
*/
@@ -68,7 +73,7 @@
return -EACCES;
/* let LSM be the final arbiter */
- return security_key_permission(key_ref, context, perm);
+ return security_key_permission(key_ref, cred, perm);
} /* end key_task_permission() */
diff --git a/security/keys/proc.c b/security/keys/proc.c
index f619170..7f508de 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -136,8 +136,12 @@
int rc;
/* check whether the current task is allowed to view the key (assuming
- * non-possession) */
- rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);
+ * non-possession)
+ * - the caller holds a spinlock, and thus the RCU read lock, making our
+ * access to __current_cred() safe
+ */
+ rc = key_task_permission(make_key_ref(key, 0), current_cred(),
+ KEY_VIEW);
if (rc < 0)
return 0;
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 45b240a..2f5d89e 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -40,13 +40,17 @@
/*
* install user and user session keyrings for a particular UID
*/
-int install_user_keyrings(struct task_struct *tsk)
+int install_user_keyrings(void)
{
- struct user_struct *user = tsk->user;
+ struct user_struct *user;
+ const struct cred *cred;
struct key *uid_keyring, *session_keyring;
char buf[20];
int ret;
+ cred = current_cred();
+ user = cred->user;
+
kenter("%p{%u}", user, user->uid);
if (user->uid_keyring) {
@@ -67,7 +71,7 @@
uid_keyring = find_keyring_by_name(buf, true);
if (IS_ERR(uid_keyring)) {
uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1,
- tsk, KEY_ALLOC_IN_QUOTA,
+ cred, KEY_ALLOC_IN_QUOTA,
NULL);
if (IS_ERR(uid_keyring)) {
ret = PTR_ERR(uid_keyring);
@@ -83,7 +87,7 @@
if (IS_ERR(session_keyring)) {
session_keyring =
keyring_alloc(buf, user->uid, (gid_t) -1,
- tsk, KEY_ALLOC_IN_QUOTA, NULL);
+ cred, KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(session_keyring)) {
ret = PTR_ERR(session_keyring);
goto error_release;
@@ -115,140 +119,128 @@
return ret;
}
-/*****************************************************************************/
/*
- * deal with the UID changing
+ * install a fresh thread keyring directly to new credentials
*/
-void switch_uid_keyring(struct user_struct *new_user)
+int install_thread_keyring_to_cred(struct cred *new)
{
-#if 0 /* do nothing for now */
- struct key *old;
+ struct key *keyring;
- /* switch to the new user's session keyring if we were running under
- * root's default session keyring */
- if (new_user->uid != 0 &&
- current->session_keyring == &root_session_keyring
- ) {
- atomic_inc(&new_user->session_keyring->usage);
+ keyring = keyring_alloc("_tid", new->uid, new->gid, new,
+ KEY_ALLOC_QUOTA_OVERRUN, NULL);
+ if (IS_ERR(keyring))
+ return PTR_ERR(keyring);
- task_lock(current);
- old = current->session_keyring;
- current->session_keyring = new_user->session_keyring;
- task_unlock(current);
+ new->thread_keyring = keyring;
+ return 0;
+}
- key_put(old);
- }
-#endif
-
-} /* end switch_uid_keyring() */
-
-/*****************************************************************************/
/*
* install a fresh thread keyring, discarding the old one
*/
-int install_thread_keyring(struct task_struct *tsk)
+static int install_thread_keyring(void)
{
- struct key *keyring, *old;
- char buf[20];
+ struct cred *new;
int ret;
- sprintf(buf, "_tid.%u", tsk->pid);
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
- KEY_ALLOC_QUOTA_OVERRUN, NULL);
- if (IS_ERR(keyring)) {
- ret = PTR_ERR(keyring);
- goto error;
+ BUG_ON(new->thread_keyring);
+
+ ret = install_thread_keyring_to_cred(new);
+ if (ret < 0) {
+ abort_creds(new);
+ return ret;
}
- task_lock(tsk);
- old = tsk->thread_keyring;
- tsk->thread_keyring = keyring;
- task_unlock(tsk);
+ return commit_creds(new);
+}
- ret = 0;
-
- key_put(old);
-error:
- return ret;
-
-} /* end install_thread_keyring() */
-
-/*****************************************************************************/
/*
- * make sure a process keyring is installed
+ * install a process keyring directly to a credentials struct
+ * - returns -EEXIST if there was already a process keyring, 0 if one installed,
+ * and other -ve on any other error
*/
-int install_process_keyring(struct task_struct *tsk)
+int install_process_keyring_to_cred(struct cred *new)
{
struct key *keyring;
- char buf[20];
int ret;
- might_sleep();
+ if (new->tgcred->process_keyring)
+ return -EEXIST;
- if (!tsk->signal->process_keyring) {
- sprintf(buf, "_pid.%u", tsk->tgid);
+ keyring = keyring_alloc("_pid", new->uid, new->gid,
+ new, KEY_ALLOC_QUOTA_OVERRUN, NULL);
+ if (IS_ERR(keyring))
+ return PTR_ERR(keyring);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
- KEY_ALLOC_QUOTA_OVERRUN, NULL);
- if (IS_ERR(keyring)) {
- ret = PTR_ERR(keyring);
- goto error;
- }
+ spin_lock_irq(&new->tgcred->lock);
+ if (!new->tgcred->process_keyring) {
+ new->tgcred->process_keyring = keyring;
+ keyring = NULL;
+ ret = 0;
+ } else {
+ ret = -EEXIST;
+ }
+ spin_unlock_irq(&new->tgcred->lock);
+ key_put(keyring);
+ return ret;
+}
- /* attach keyring */
- spin_lock_irq(&tsk->sighand->siglock);
- if (!tsk->signal->process_keyring) {
- tsk->signal->process_keyring = keyring;
- keyring = NULL;
- }
- spin_unlock_irq(&tsk->sighand->siglock);
+/*
+ * make sure a process keyring is installed
+ * - we
+ */
+static int install_process_keyring(void)
+{
+ struct cred *new;
+ int ret;
- key_put(keyring);
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ ret = install_process_keyring_to_cred(new);
+ if (ret < 0) {
+ abort_creds(new);
+ return ret != -EEXIST ?: 0;
}
- ret = 0;
-error:
- return ret;
+ return commit_creds(new);
+}
-} /* end install_process_keyring() */
-
-/*****************************************************************************/
/*
- * install a session keyring, discarding the old one
- * - if a keyring is not supplied, an empty one is invented
+ * install a session keyring directly to a credentials struct
*/
-static int install_session_keyring(struct task_struct *tsk,
- struct key *keyring)
+static int install_session_keyring_to_cred(struct cred *cred,
+ struct key *keyring)
{
unsigned long flags;
struct key *old;
- char buf[20];
might_sleep();
/* create an empty session keyring */
if (!keyring) {
- sprintf(buf, "_ses.%u", tsk->tgid);
-
flags = KEY_ALLOC_QUOTA_OVERRUN;
- if (tsk->signal->session_keyring)
+ if (cred->tgcred->session_keyring)
flags = KEY_ALLOC_IN_QUOTA;
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
- flags, NULL);
+ keyring = keyring_alloc("_ses", cred->uid, cred->gid,
+ cred, flags, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
- }
- else {
+ } else {
atomic_inc(&keyring->usage);
}
/* install the keyring */
- spin_lock_irq(&tsk->sighand->siglock);
- old = tsk->signal->session_keyring;
- rcu_assign_pointer(tsk->signal->session_keyring, keyring);
- spin_unlock_irq(&tsk->sighand->siglock);
+ spin_lock_irq(&cred->tgcred->lock);
+ old = cred->tgcred->session_keyring;
+ rcu_assign_pointer(cred->tgcred->session_keyring, keyring);
+ spin_unlock_irq(&cred->tgcred->lock);
/* we're using RCU on the pointer, but there's no point synchronising
* on it if it didn't previously point to anything */
@@ -258,110 +250,29 @@
}
return 0;
+}
-} /* end install_session_keyring() */
-
-/*****************************************************************************/
/*
- * copy the keys in a thread group for fork without CLONE_THREAD
+ * install a session keyring, discarding the old one
+ * - if a keyring is not supplied, an empty one is invented
*/
-int copy_thread_group_keys(struct task_struct *tsk)
+static int install_session_keyring(struct key *keyring)
{
- key_check(current->thread_group->session_keyring);
- key_check(current->thread_group->process_keyring);
+ struct cred *new;
+ int ret;
- /* no process keyring yet */
- tsk->signal->process_keyring = NULL;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
- /* same session keyring */
- rcu_read_lock();
- tsk->signal->session_keyring =
- key_get(rcu_dereference(current->signal->session_keyring));
- rcu_read_unlock();
+ ret = install_session_keyring_to_cred(new, NULL);
+ if (ret < 0) {
+ abort_creds(new);
+ return ret;
+ }
- return 0;
-
-} /* end copy_thread_group_keys() */
-
-/*****************************************************************************/
-/*
- * copy the keys for fork
- */
-int copy_keys(unsigned long clone_flags, struct task_struct *tsk)
-{
- key_check(tsk->thread_keyring);
- key_check(tsk->request_key_auth);
-
- /* no thread keyring yet */
- tsk->thread_keyring = NULL;
-
- /* copy the request_key() authorisation for this thread */
- key_get(tsk->request_key_auth);
-
- return 0;
-
-} /* end copy_keys() */
-
-/*****************************************************************************/
-/*
- * dispose of thread group keys upon thread group destruction
- */
-void exit_thread_group_keys(struct signal_struct *tg)
-{
- key_put(tg->session_keyring);
- key_put(tg->process_keyring);
-
-} /* end exit_thread_group_keys() */
-
-/*****************************************************************************/
-/*
- * dispose of per-thread keys upon thread exit
- */
-void exit_keys(struct task_struct *tsk)
-{
- key_put(tsk->thread_keyring);
- key_put(tsk->request_key_auth);
-
-} /* end exit_keys() */
-
-/*****************************************************************************/
-/*
- * deal with execve()
- */
-int exec_keys(struct task_struct *tsk)
-{
- struct key *old;
-
- /* newly exec'd tasks don't get a thread keyring */
- task_lock(tsk);
- old = tsk->thread_keyring;
- tsk->thread_keyring = NULL;
- task_unlock(tsk);
-
- key_put(old);
-
- /* discard the process keyring from a newly exec'd task */
- spin_lock_irq(&tsk->sighand->siglock);
- old = tsk->signal->process_keyring;
- tsk->signal->process_keyring = NULL;
- spin_unlock_irq(&tsk->sighand->siglock);
-
- key_put(old);
-
- return 0;
-
-} /* end exec_keys() */
-
-/*****************************************************************************/
-/*
- * deal with SUID programs
- * - we might want to make this invent a new session keyring
- */
-int suid_keys(struct task_struct *tsk)
-{
- return 0;
-
-} /* end suid_keys() */
+ return commit_creds(new);
+}
/*****************************************************************************/
/*
@@ -370,10 +281,11 @@
void key_fsuid_changed(struct task_struct *tsk)
{
/* update the ownership of the thread keyring */
- if (tsk->thread_keyring) {
- down_write(&tsk->thread_keyring->sem);
- tsk->thread_keyring->uid = tsk->fsuid;
- up_write(&tsk->thread_keyring->sem);
+ BUG_ON(!tsk->cred);
+ if (tsk->cred->thread_keyring) {
+ down_write(&tsk->cred->thread_keyring->sem);
+ tsk->cred->thread_keyring->uid = tsk->cred->fsuid;
+ up_write(&tsk->cred->thread_keyring->sem);
}
} /* end key_fsuid_changed() */
@@ -385,10 +297,11 @@
void key_fsgid_changed(struct task_struct *tsk)
{
/* update the ownership of the thread keyring */
- if (tsk->thread_keyring) {
- down_write(&tsk->thread_keyring->sem);
- tsk->thread_keyring->gid = tsk->fsgid;
- up_write(&tsk->thread_keyring->sem);
+ BUG_ON(!tsk->cred);
+ if (tsk->cred->thread_keyring) {
+ down_write(&tsk->cred->thread_keyring->sem);
+ tsk->cred->thread_keyring->gid = tsk->cred->fsgid;
+ up_write(&tsk->cred->thread_keyring->sem);
}
} /* end key_fsgid_changed() */
@@ -404,7 +317,7 @@
key_ref_t search_process_keyrings(struct key_type *type,
const void *description,
key_match_func_t match,
- struct task_struct *context)
+ const struct cred *cred)
{
struct request_key_auth *rka;
key_ref_t key_ref, ret, err;
@@ -423,10 +336,10 @@
err = ERR_PTR(-EAGAIN);
/* search the thread keyring first */
- if (context->thread_keyring) {
+ if (cred->thread_keyring) {
key_ref = keyring_search_aux(
- make_key_ref(context->thread_keyring, 1),
- context, type, description, match);
+ make_key_ref(cred->thread_keyring, 1),
+ cred, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@@ -444,10 +357,10 @@
}
/* search the process keyring second */
- if (context->signal->process_keyring) {
+ if (cred->tgcred->process_keyring) {
key_ref = keyring_search_aux(
- make_key_ref(context->signal->process_keyring, 1),
- context, type, description, match);
+ make_key_ref(cred->tgcred->process_keyring, 1),
+ cred, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@@ -465,13 +378,13 @@
}
/* search the session keyring */
- if (context->signal->session_keyring) {
+ if (cred->tgcred->session_keyring) {
rcu_read_lock();
key_ref = keyring_search_aux(
make_key_ref(rcu_dereference(
- context->signal->session_keyring),
+ cred->tgcred->session_keyring),
1),
- context, type, description, match);
+ cred, type, description, match);
rcu_read_unlock();
if (!IS_ERR(key_ref))
@@ -490,10 +403,10 @@
}
}
/* or search the user-session keyring */
- else if (context->user->session_keyring) {
+ else if (cred->user->session_keyring) {
key_ref = keyring_search_aux(
- make_key_ref(context->user->session_keyring, 1),
- context, type, description, match);
+ make_key_ref(cred->user->session_keyring, 1),
+ cred, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@@ -514,20 +427,20 @@
* search the keyrings of the process mentioned there
* - we don't permit access to request_key auth keys via this method
*/
- if (context->request_key_auth &&
- context == current &&
+ if (cred->request_key_auth &&
+ cred == current_cred() &&
type != &key_type_request_key_auth
) {
/* defend against the auth key being revoked */
- down_read(&context->request_key_auth->sem);
+ down_read(&cred->request_key_auth->sem);
- if (key_validate(context->request_key_auth) == 0) {
- rka = context->request_key_auth->payload.data;
+ if (key_validate(cred->request_key_auth) == 0) {
+ rka = cred->request_key_auth->payload.data;
key_ref = search_process_keyrings(type, description,
- match, rka->context);
+ match, rka->cred);
- up_read(&context->request_key_auth->sem);
+ up_read(&cred->request_key_auth->sem);
if (!IS_ERR(key_ref))
goto found;
@@ -544,7 +457,7 @@
break;
}
} else {
- up_read(&context->request_key_auth->sem);
+ up_read(&cred->request_key_auth->sem);
}
}
@@ -572,93 +485,98 @@
* - don't create special keyrings unless so requested
* - partially constructed keys aren't found unless requested
*/
-key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
- int create, int partial, key_perm_t perm)
+key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
+ key_perm_t perm)
{
- key_ref_t key_ref, skey_ref;
+ struct request_key_auth *rka;
+ const struct cred *cred;
struct key *key;
+ key_ref_t key_ref, skey_ref;
int ret;
- if (!context)
- context = current;
-
+try_again:
+ cred = get_current_cred();
key_ref = ERR_PTR(-ENOKEY);
switch (id) {
case KEY_SPEC_THREAD_KEYRING:
- if (!context->thread_keyring) {
+ if (!cred->thread_keyring) {
if (!create)
goto error;
- ret = install_thread_keyring(context);
+ ret = install_thread_keyring();
if (ret < 0) {
key = ERR_PTR(ret);
goto error;
}
+ goto reget_creds;
}
- key = context->thread_keyring;
+ key = cred->thread_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_PROCESS_KEYRING:
- if (!context->signal->process_keyring) {
+ if (!cred->tgcred->process_keyring) {
if (!create)
goto error;
- ret = install_process_keyring(context);
+ ret = install_process_keyring();
if (ret < 0) {
key = ERR_PTR(ret);
goto error;
}
+ goto reget_creds;
}
- key = context->signal->process_keyring;
+ key = cred->tgcred->process_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_SESSION_KEYRING:
- if (!context->signal->session_keyring) {
+ if (!cred->tgcred->session_keyring) {
/* always install a session keyring upon access if one
* doesn't exist yet */
- ret = install_user_keyrings(context);
+ ret = install_user_keyrings();
if (ret < 0)
goto error;
ret = install_session_keyring(
- context, context->user->session_keyring);
+ cred->user->session_keyring);
+
if (ret < 0)
goto error;
+ goto reget_creds;
}
rcu_read_lock();
- key = rcu_dereference(context->signal->session_keyring);
+ key = rcu_dereference(cred->tgcred->session_keyring);
atomic_inc(&key->usage);
rcu_read_unlock();
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_KEYRING:
- if (!context->user->uid_keyring) {
- ret = install_user_keyrings(context);
+ if (!cred->user->uid_keyring) {
+ ret = install_user_keyrings();
if (ret < 0)
goto error;
}
- key = context->user->uid_keyring;
+ key = cred->user->uid_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_SESSION_KEYRING:
- if (!context->user->session_keyring) {
- ret = install_user_keyrings(context);
+ if (!cred->user->session_keyring) {
+ ret = install_user_keyrings();
if (ret < 0)
goto error;
}
- key = context->user->session_keyring;
+ key = cred->user->session_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
@@ -669,7 +587,7 @@
goto error;
case KEY_SPEC_REQKEY_AUTH_KEY:
- key = context->request_key_auth;
+ key = cred->request_key_auth;
if (!key)
goto error;
@@ -677,6 +595,25 @@
key_ref = make_key_ref(key, 1);
break;
+ case KEY_SPEC_REQUESTOR_KEYRING:
+ if (!cred->request_key_auth)
+ goto error;
+
+ down_read(&cred->request_key_auth->sem);
+ if (cred->request_key_auth->flags & KEY_FLAG_REVOKED) {
+ key_ref = ERR_PTR(-EKEYREVOKED);
+ key = NULL;
+ } else {
+ rka = cred->request_key_auth->payload.data;
+ key = rka->dest_keyring;
+ atomic_inc(&key->usage);
+ }
+ up_read(&cred->request_key_auth->sem);
+ if (!key)
+ goto error;
+ key_ref = make_key_ref(key, 1);
+ break;
+
default:
key_ref = ERR_PTR(-EINVAL);
if (id < 1)
@@ -693,7 +630,7 @@
/* check to see if we possess the key */
skey_ref = search_process_keyrings(key->type, key,
lookup_user_key_possessed,
- current);
+ cred);
if (!IS_ERR(skey_ref)) {
key_put(key);
@@ -725,11 +662,12 @@
goto invalid_key;
/* check the permissions */
- ret = key_task_permission(key_ref, context, perm);
+ ret = key_task_permission(key_ref, cred, perm);
if (ret < 0)
goto invalid_key;
error:
+ put_cred(cred);
return key_ref;
invalid_key:
@@ -737,6 +675,12 @@
key_ref = ERR_PTR(ret);
goto error;
+ /* if we attempted to install a keyring, then it may have caused new
+ * creds to be installed */
+reget_creds:
+ put_cred(cred);
+ goto try_again;
+
} /* end lookup_user_key() */
/*****************************************************************************/
@@ -748,20 +692,33 @@
*/
long join_session_keyring(const char *name)
{
- struct task_struct *tsk = current;
+ const struct cred *old;
+ struct cred *new;
struct key *keyring;
- long ret;
+ long ret, serial;
+
+ /* only permit this if there's a single thread in the thread group -
+ * this avoids us having to adjust the creds on all threads and risking
+ * ENOMEM */
+ if (!is_single_threaded(current))
+ return -EMLINK;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
/* if no name is provided, install an anonymous keyring */
if (!name) {
- ret = install_session_keyring(tsk, NULL);
+ ret = install_session_keyring_to_cred(new, NULL);
if (ret < 0)
goto error;
- rcu_read_lock();
- ret = rcu_dereference(tsk->signal->session_keyring)->serial;
- rcu_read_unlock();
- goto error;
+ serial = new->tgcred->session_keyring->serial;
+ ret = commit_creds(new);
+ if (ret == 0)
+ ret = serial;
+ goto okay;
}
/* allow the user to join or create a named keyring */
@@ -771,29 +728,33 @@
keyring = find_keyring_by_name(name, false);
if (PTR_ERR(keyring) == -ENOKEY) {
/* not found - try and create a new one */
- keyring = keyring_alloc(name, tsk->uid, tsk->gid, tsk,
+ keyring = keyring_alloc(name, old->uid, old->gid, old,
KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
}
- }
- else if (IS_ERR(keyring)) {
+ } else if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
}
/* we've got a keyring - now to install it */
- ret = install_session_keyring(tsk, keyring);
+ ret = install_session_keyring_to_cred(new, keyring);
if (ret < 0)
goto error2;
+ commit_creds(new);
+ mutex_unlock(&key_session_mutex);
+
ret = keyring->serial;
key_put(keyring);
+okay:
+ return ret;
error2:
mutex_unlock(&key_session_mutex);
error:
+ abort_creds(new);
return ret;
-
-} /* end join_session_keyring() */
+}
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index abea08f..0e04f72 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -19,6 +19,8 @@
#include <linux/slab.h>
#include "internal.h"
+#define key_negative_timeout 60 /* default timeout on a negative key's existence */
+
/*
* wait_on_bit() sleep function for uninterruptible waiting
*/
@@ -64,7 +66,7 @@
const char *op,
void *aux)
{
- struct task_struct *tsk = current;
+ const struct cred *cred = current_cred();
key_serial_t prkey, sskey;
struct key *key = cons->key, *authkey = cons->authkey, *keyring;
char *argv[9], *envp[3], uid_str[12], gid_str[12];
@@ -74,15 +76,17 @@
kenter("{%d},{%d},%s", key->serial, authkey->serial, op);
- ret = install_user_keyrings(tsk);
+ ret = install_user_keyrings();
if (ret < 0)
goto error_alloc;
/* allocate a new session keyring */
sprintf(desc, "_req.%u", key->serial);
- keyring = keyring_alloc(desc, current->fsuid, current->fsgid, current,
+ cred = get_current_cred();
+ keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred,
KEY_ALLOC_QUOTA_OVERRUN, NULL);
+ put_cred(cred);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error_alloc;
@@ -94,29 +98,24 @@
goto error_link;
/* record the UID and GID */
- sprintf(uid_str, "%d", current->fsuid);
- sprintf(gid_str, "%d", current->fsgid);
+ sprintf(uid_str, "%d", cred->fsuid);
+ sprintf(gid_str, "%d", cred->fsgid);
/* we say which key is under construction */
sprintf(key_str, "%d", key->serial);
/* we specify the process's default keyrings */
sprintf(keyring_str[0], "%d",
- tsk->thread_keyring ? tsk->thread_keyring->serial : 0);
+ cred->thread_keyring ? cred->thread_keyring->serial : 0);
prkey = 0;
- if (tsk->signal->process_keyring)
- prkey = tsk->signal->process_keyring->serial;
+ if (cred->tgcred->process_keyring)
+ prkey = cred->tgcred->process_keyring->serial;
- sprintf(keyring_str[1], "%d", prkey);
-
- if (tsk->signal->session_keyring) {
- rcu_read_lock();
- sskey = rcu_dereference(tsk->signal->session_keyring)->serial;
- rcu_read_unlock();
- } else {
- sskey = tsk->user->session_keyring->serial;
- }
+ if (cred->tgcred->session_keyring)
+ sskey = rcu_dereference(cred->tgcred->session_keyring)->serial;
+ else
+ sskey = cred->user->session_keyring->serial;
sprintf(keyring_str[2], "%d", sskey);
@@ -157,8 +156,8 @@
key_put(keyring);
error_alloc:
- kleave(" = %d", ret);
complete_request_key(cons, ret);
+ kleave(" = %d", ret);
return ret;
}
@@ -167,7 +166,8 @@
* - we ignore program failure and go on key status instead
*/
static int construct_key(struct key *key, const void *callout_info,
- size_t callout_len, void *aux)
+ size_t callout_len, void *aux,
+ struct key *dest_keyring)
{
struct key_construction *cons;
request_key_actor_t actor;
@@ -181,7 +181,8 @@
return -ENOMEM;
/* allocate an authorisation key */
- authkey = request_key_auth_new(key, callout_info, callout_len);
+ authkey = request_key_auth_new(key, callout_info, callout_len,
+ dest_keyring);
if (IS_ERR(authkey)) {
kfree(cons);
ret = PTR_ERR(authkey);
@@ -209,46 +210,67 @@
}
/*
- * link a key to the appropriate destination keyring
- * - the caller must hold a write lock on the destination keyring
+ * get the appropriate destination keyring for the request
+ * - we return whatever keyring we select with an extra reference upon it which
+ * the caller must release
*/
-static void construct_key_make_link(struct key *key, struct key *dest_keyring)
+static void construct_get_dest_keyring(struct key **_dest_keyring)
{
- struct task_struct *tsk = current;
- struct key *drop = NULL;
+ struct request_key_auth *rka;
+ const struct cred *cred = current_cred();
+ struct key *dest_keyring = *_dest_keyring, *authkey;
- kenter("{%d},%p", key->serial, dest_keyring);
+ kenter("%p", dest_keyring);
/* find the appropriate keyring */
- if (!dest_keyring) {
- switch (tsk->jit_keyring) {
+ if (dest_keyring) {
+ /* the caller supplied one */
+ key_get(dest_keyring);
+ } else {
+ /* use a default keyring; falling through the cases until we
+ * find one that we actually have */
+ switch (cred->jit_keyring) {
case KEY_REQKEY_DEFL_DEFAULT:
+ case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
+ if (cred->request_key_auth) {
+ authkey = cred->request_key_auth;
+ down_read(&authkey->sem);
+ rka = authkey->payload.data;
+ if (!test_bit(KEY_FLAG_REVOKED,
+ &authkey->flags))
+ dest_keyring =
+ key_get(rka->dest_keyring);
+ up_read(&authkey->sem);
+ if (dest_keyring)
+ break;
+ }
+
case KEY_REQKEY_DEFL_THREAD_KEYRING:
- dest_keyring = tsk->thread_keyring;
+ dest_keyring = key_get(cred->thread_keyring);
if (dest_keyring)
break;
case KEY_REQKEY_DEFL_PROCESS_KEYRING:
- dest_keyring = tsk->signal->process_keyring;
+ dest_keyring = key_get(cred->tgcred->process_keyring);
if (dest_keyring)
break;
case KEY_REQKEY_DEFL_SESSION_KEYRING:
rcu_read_lock();
dest_keyring = key_get(
- rcu_dereference(tsk->signal->session_keyring));
+ rcu_dereference(cred->tgcred->session_keyring));
rcu_read_unlock();
- drop = dest_keyring;
if (dest_keyring)
break;
case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
- dest_keyring = tsk->user->session_keyring;
+ dest_keyring =
+ key_get(cred->user->session_keyring);
break;
case KEY_REQKEY_DEFL_USER_KEYRING:
- dest_keyring = tsk->user->uid_keyring;
+ dest_keyring = key_get(cred->user->uid_keyring);
break;
case KEY_REQKEY_DEFL_GROUP_KEYRING:
@@ -257,10 +279,9 @@
}
}
- /* and attach the key to it */
- __key_link(dest_keyring, key);
- key_put(drop);
- kleave("");
+ *_dest_keyring = dest_keyring;
+ kleave(" [dk %d]", key_serial(dest_keyring));
+ return;
}
/*
@@ -275,6 +296,7 @@
struct key_user *user,
struct key **_key)
{
+ const struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref;
@@ -282,33 +304,28 @@
mutex_lock(&user->cons_lock);
- key = key_alloc(type, description,
- current->fsuid, current->fsgid, current, KEY_POS_ALL,
- flags);
+ key = key_alloc(type, description, cred->fsuid, cred->fsgid, cred,
+ KEY_POS_ALL, flags);
if (IS_ERR(key))
goto alloc_failed;
set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
- if (dest_keyring)
- down_write(&dest_keyring->sem);
+ down_write(&dest_keyring->sem);
/* attach the key to the destination keyring under lock, but we do need
* to do another check just in case someone beat us to it whilst we
* waited for locks */
mutex_lock(&key_construction_mutex);
- key_ref = search_process_keyrings(type, description, type->match,
- current);
+ key_ref = search_process_keyrings(type, description, type->match, cred);
if (!IS_ERR(key_ref))
goto key_already_present;
- if (dest_keyring)
- construct_key_make_link(key, dest_keyring);
+ __key_link(dest_keyring, key);
mutex_unlock(&key_construction_mutex);
- if (dest_keyring)
- up_write(&dest_keyring->sem);
+ up_write(&dest_keyring->sem);
mutex_unlock(&user->cons_lock);
*_key = key;
kleave(" = 0 [%d]", key_serial(key));
@@ -346,25 +363,36 @@
struct key *key;
int ret;
- user = key_user_lookup(current->fsuid);
+ kenter("");
+
+ user = key_user_lookup(current_fsuid());
if (!user)
return ERR_PTR(-ENOMEM);
+ construct_get_dest_keyring(&dest_keyring);
+
ret = construct_alloc_key(type, description, dest_keyring, flags, user,
&key);
key_user_put(user);
if (ret == 0) {
- ret = construct_key(key, callout_info, callout_len, aux);
- if (ret < 0)
+ ret = construct_key(key, callout_info, callout_len, aux,
+ dest_keyring);
+ if (ret < 0) {
+ kdebug("cons failed");
goto construction_failed;
+ }
}
+ key_put(dest_keyring);
+ kleave(" = key %d", key_serial(key));
return key;
construction_failed:
key_negate_and_link(key, key_negative_timeout, NULL, NULL);
key_put(key);
+ key_put(dest_keyring);
+ kleave(" = %d", ret);
return ERR_PTR(ret);
}
@@ -383,6 +411,7 @@
struct key *dest_keyring,
unsigned long flags)
{
+ const struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref;
@@ -392,7 +421,7 @@
/* search all the process keyrings for a key */
key_ref = search_process_keyrings(type, description, type->match,
- current);
+ cred);
if (!IS_ERR(key_ref)) {
key = key_ref_to_ptr(key_ref);
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index bd237b0..8674715 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -105,9 +105,9 @@
kenter("{%d}", key->serial);
- if (rka->context) {
- put_task_struct(rka->context);
- rka->context = NULL;
+ if (rka->cred) {
+ put_cred(rka->cred);
+ rka->cred = NULL;
}
} /* end request_key_auth_revoke() */
@@ -122,12 +122,13 @@
kenter("{%d}", key->serial);
- if (rka->context) {
- put_task_struct(rka->context);
- rka->context = NULL;
+ if (rka->cred) {
+ put_cred(rka->cred);
+ rka->cred = NULL;
}
key_put(rka->target_key);
+ key_put(rka->dest_keyring);
kfree(rka->callout_info);
kfree(rka);
@@ -139,9 +140,10 @@
* access to the caller's security data
*/
struct key *request_key_auth_new(struct key *target, const void *callout_info,
- size_t callout_len)
+ size_t callout_len, struct key *dest_keyring)
{
struct request_key_auth *rka, *irka;
+ const struct cred *cred = current->cred;
struct key *authkey = NULL;
char desc[20];
int ret;
@@ -163,31 +165,29 @@
/* see if the calling process is already servicing the key request of
* another process */
- if (current->request_key_auth) {
+ if (cred->request_key_auth) {
/* it is - use that instantiation context here too */
- down_read(¤t->request_key_auth->sem);
+ down_read(&cred->request_key_auth->sem);
/* if the auth key has been revoked, then the key we're
* servicing is already instantiated */
- if (test_bit(KEY_FLAG_REVOKED,
- ¤t->request_key_auth->flags))
+ if (test_bit(KEY_FLAG_REVOKED, &cred->request_key_auth->flags))
goto auth_key_revoked;
- irka = current->request_key_auth->payload.data;
- rka->context = irka->context;
+ irka = cred->request_key_auth->payload.data;
+ rka->cred = get_cred(irka->cred);
rka->pid = irka->pid;
- get_task_struct(rka->context);
- up_read(¤t->request_key_auth->sem);
+ up_read(&cred->request_key_auth->sem);
}
else {
/* it isn't - use this process as the context */
- rka->context = current;
+ rka->cred = get_cred(cred);
rka->pid = current->pid;
- get_task_struct(rka->context);
}
rka->target_key = key_get(target);
+ rka->dest_keyring = key_get(dest_keyring);
memcpy(rka->callout_info, callout_info, callout_len);
rka->callout_len = callout_len;
@@ -195,7 +195,7 @@
sprintf(desc, "%x", target->serial);
authkey = key_alloc(&key_type_request_key_auth, desc,
- current->fsuid, current->fsgid, current,
+ cred->fsuid, cred->fsgid, cred,
KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
KEY_USR_VIEW, KEY_ALLOC_NOT_IN_QUOTA);
if (IS_ERR(authkey)) {
@@ -203,16 +203,16 @@
goto error_alloc;
}
- /* construct and attach to the keyring */
+ /* construct the auth key */
ret = key_instantiate_and_link(authkey, rka, 0, NULL, NULL);
if (ret < 0)
goto error_inst;
- kleave(" = {%d}", authkey->serial);
+ kleave(" = {%d,%d}", authkey->serial, atomic_read(&authkey->usage));
return authkey;
auth_key_revoked:
- up_read(¤t->request_key_auth->sem);
+ up_read(&cred->request_key_auth->sem);
kfree(rka->callout_info);
kfree(rka);
kleave("= -EKEYREVOKED");
@@ -223,6 +223,7 @@
key_put(authkey);
error_alloc:
key_put(rka->target_key);
+ key_put(rka->dest_keyring);
kfree(rka->callout_info);
kfree(rka);
kleave("= %d", ret);
@@ -254,6 +255,7 @@
*/
struct key *key_get_instantiation_authkey(key_serial_t target_id)
{
+ const struct cred *cred = current_cred();
struct key *authkey;
key_ref_t authkey_ref;
@@ -261,7 +263,7 @@
&key_type_request_key_auth,
(void *) (unsigned long) target_id,
key_get_instantiation_authkey_match,
- current);
+ cred);
if (IS_ERR(authkey_ref)) {
authkey = ERR_CAST(authkey_ref);
diff --git a/security/root_plug.c b/security/root_plug.c
index c3f68b5..40fb4f1 100644
--- a/security/root_plug.c
+++ b/security/root_plug.c
@@ -55,9 +55,9 @@
struct usb_device *dev;
root_dbg("file %s, e_uid = %d, e_gid = %d\n",
- bprm->filename, bprm->e_uid, bprm->e_gid);
+ bprm->filename, bprm->cred->euid, bprm->cred->egid);
- if (bprm->e_gid == 0) {
+ if (bprm->cred->egid == 0) {
dev = usb_find_device(vendor_id, product_id);
if (!dev) {
root_dbg("e_gid = 0, and device not found, "
@@ -75,15 +75,12 @@
.ptrace_may_access = cap_ptrace_may_access,
.ptrace_traceme = cap_ptrace_traceme,
.capget = cap_capget,
- .capset_check = cap_capset_check,
- .capset_set = cap_capset_set,
+ .capset = cap_capset,
.capable = cap_capable,
- .bprm_apply_creds = cap_bprm_apply_creds,
- .bprm_set_security = cap_bprm_set_security,
+ .bprm_set_creds = cap_bprm_set_creds,
- .task_post_setuid = cap_task_post_setuid,
- .task_reparent_to_init = cap_task_reparent_to_init,
+ .task_fix_setuid = cap_task_fix_setuid,
.task_prctl = cap_task_prctl,
.bprm_check_security = rootplug_bprm_check_security,
diff --git a/security/security.c b/security/security.c
index c0acfa7..038ef04 100644
--- a/security/security.c
+++ b/security/security.c
@@ -145,25 +145,23 @@
return security_ops->capget(target, effective, inheritable, permitted);
}
-int security_capset_check(struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
+int security_capset(struct cred *new, const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted)
{
- return security_ops->capset_check(target, effective, inheritable, permitted);
-}
-
-void security_capset_set(struct task_struct *target,
- kernel_cap_t *effective,
- kernel_cap_t *inheritable,
- kernel_cap_t *permitted)
-{
- security_ops->capset_set(target, effective, inheritable, permitted);
+ return security_ops->capset(new, old,
+ effective, inheritable, permitted);
}
int security_capable(struct task_struct *tsk, int cap)
{
- return security_ops->capable(tsk, cap);
+ return security_ops->capable(tsk, cap, SECURITY_CAP_AUDIT);
+}
+
+int security_capable_noaudit(struct task_struct *tsk, int cap)
+{
+ return security_ops->capable(tsk, cap, SECURITY_CAP_NOAUDIT);
}
int security_acct(struct file *file)
@@ -215,29 +213,9 @@
return security_ops->vm_enough_memory(current->mm, pages);
}
-int security_bprm_alloc(struct linux_binprm *bprm)
+int security_bprm_set_creds(struct linux_binprm *bprm)
{
- return security_ops->bprm_alloc_security(bprm);
-}
-
-void security_bprm_free(struct linux_binprm *bprm)
-{
- security_ops->bprm_free_security(bprm);
-}
-
-void security_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
-{
- security_ops->bprm_apply_creds(bprm, unsafe);
-}
-
-void security_bprm_post_apply_creds(struct linux_binprm *bprm)
-{
- security_ops->bprm_post_apply_creds(bprm);
-}
-
-int security_bprm_set(struct linux_binprm *bprm)
-{
- return security_ops->bprm_set_security(bprm);
+ return security_ops->bprm_set_creds(bprm);
}
int security_bprm_check(struct linux_binprm *bprm)
@@ -245,6 +223,16 @@
return security_ops->bprm_check_security(bprm);
}
+void security_bprm_committing_creds(struct linux_binprm *bprm)
+{
+ return security_ops->bprm_committing_creds(bprm);
+}
+
+void security_bprm_committed_creds(struct linux_binprm *bprm)
+{
+ return security_ops->bprm_committed_creds(bprm);
+}
+
int security_bprm_secureexec(struct linux_binprm *bprm)
{
return security_ops->bprm_secureexec(bprm);
@@ -603,9 +591,9 @@
return security_ops->file_receive(file);
}
-int security_dentry_open(struct file *file)
+int security_dentry_open(struct file *file, const struct cred *cred)
{
- return security_ops->dentry_open(file);
+ return security_ops->dentry_open(file, cred);
}
int security_task_create(unsigned long clone_flags)
@@ -613,14 +601,29 @@
return security_ops->task_create(clone_flags);
}
-int security_task_alloc(struct task_struct *p)
+void security_cred_free(struct cred *cred)
{
- return security_ops->task_alloc_security(p);
+ security_ops->cred_free(cred);
}
-void security_task_free(struct task_struct *p)
+int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
{
- security_ops->task_free_security(p);
+ return security_ops->cred_prepare(new, old, gfp);
+}
+
+void security_commit_creds(struct cred *new, const struct cred *old)
+{
+ return security_ops->cred_commit(new, old);
+}
+
+int security_kernel_act_as(struct cred *new, u32 secid)
+{
+ return security_ops->kernel_act_as(new, secid);
+}
+
+int security_kernel_create_files_as(struct cred *new, struct inode *inode)
+{
+ return security_ops->kernel_create_files_as(new, inode);
}
int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
@@ -628,10 +631,10 @@
return security_ops->task_setuid(id0, id1, id2, flags);
}
-int security_task_post_setuid(uid_t old_ruid, uid_t old_euid,
- uid_t old_suid, int flags)
+int security_task_fix_setuid(struct cred *new, const struct cred *old,
+ int flags)
{
- return security_ops->task_post_setuid(old_ruid, old_euid, old_suid, flags);
+ return security_ops->task_fix_setuid(new, old, flags);
}
int security_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
@@ -713,14 +716,9 @@
}
int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
- unsigned long arg4, unsigned long arg5, long *rc_p)
+ unsigned long arg4, unsigned long arg5)
{
- return security_ops->task_prctl(option, arg2, arg3, arg4, arg5, rc_p);
-}
-
-void security_task_reparent_to_init(struct task_struct *p)
-{
- security_ops->task_reparent_to_init(p);
+ return security_ops->task_prctl(option, arg2, arg3, arg4, arg5);
}
void security_task_to_inode(struct task_struct *p, struct inode *inode)
@@ -1120,9 +1118,10 @@
#ifdef CONFIG_KEYS
-int security_key_alloc(struct key *key, struct task_struct *tsk, unsigned long flags)
+int security_key_alloc(struct key *key, const struct cred *cred,
+ unsigned long flags)
{
- return security_ops->key_alloc(key, tsk, flags);
+ return security_ops->key_alloc(key, cred, flags);
}
void security_key_free(struct key *key)
@@ -1131,9 +1130,9 @@
}
int security_key_permission(key_ref_t key_ref,
- struct task_struct *context, key_perm_t perm)
+ const struct cred *cred, key_perm_t perm)
{
- return security_ops->key_permission(key_ref, context, perm);
+ return security_ops->key_permission(key_ref, cred, perm);
}
int security_key_getsecurity(struct key *key, char **_buffer)
diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index 64af2d3..c73aeaa 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -39,9 +39,13 @@
int selinux_secmark_relabel_packet_permission(u32 sid)
{
if (selinux_enabled) {
- struct task_security_struct *tsec = current->security;
+ const struct task_security_struct *__tsec;
+ u32 tsid;
- return avc_has_perm(tsec->sid, sid, SECCLASS_PACKET,
+ __tsec = current_security();
+ tsid = __tsec->sid;
+
+ return avc_has_perm(tsid, sid, SECCLASS_PACKET,
PACKET__RELABELTO, NULL);
}
return 0;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f85597a..520f82a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -156,33 +156,62 @@
return (atomic_read(&selinux_secmark_refcount) > 0);
}
-/* Allocate and free functions for each kind of security blob. */
-
-static int task_alloc_security(struct task_struct *task)
+/*
+ * initialise the security for the init task
+ */
+static void cred_init_security(void)
{
+ struct cred *cred = (struct cred *) current->real_cred;
struct task_security_struct *tsec;
tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
if (!tsec)
- return -ENOMEM;
+ panic("SELinux: Failed to initialize initial task.\n");
- tsec->osid = tsec->sid = SECINITSID_UNLABELED;
- task->security = tsec;
-
- return 0;
+ tsec->osid = tsec->sid = SECINITSID_KERNEL;
+ cred->security = tsec;
}
-static void task_free_security(struct task_struct *task)
+/*
+ * get the security ID of a set of credentials
+ */
+static inline u32 cred_sid(const struct cred *cred)
{
- struct task_security_struct *tsec = task->security;
- task->security = NULL;
- kfree(tsec);
+ const struct task_security_struct *tsec;
+
+ tsec = cred->security;
+ return tsec->sid;
}
+/*
+ * get the objective security ID of a task
+ */
+static inline u32 task_sid(const struct task_struct *task)
+{
+ u32 sid;
+
+ rcu_read_lock();
+ sid = cred_sid(__task_cred(task));
+ rcu_read_unlock();
+ return sid;
+}
+
+/*
+ * get the subjective security ID of the current task
+ */
+static inline u32 current_sid(void)
+{
+ const struct task_security_struct *tsec = current_cred()->security;
+
+ return tsec->sid;
+}
+
+/* Allocate and free functions for each kind of security blob. */
+
static int inode_alloc_security(struct inode *inode)
{
- struct task_security_struct *tsec = current->security;
struct inode_security_struct *isec;
+ u32 sid = current_sid();
isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
if (!isec)
@@ -193,7 +222,7 @@
isec->inode = inode;
isec->sid = SECINITSID_UNLABELED;
isec->sclass = SECCLASS_FILE;
- isec->task_sid = tsec->sid;
+ isec->task_sid = sid;
inode->i_security = isec;
return 0;
@@ -215,15 +244,15 @@
static int file_alloc_security(struct file *file)
{
- struct task_security_struct *tsec = current->security;
struct file_security_struct *fsec;
+ u32 sid = current_sid();
fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
if (!fsec)
return -ENOMEM;
- fsec->sid = tsec->sid;
- fsec->fown_sid = tsec->sid;
+ fsec->sid = sid;
+ fsec->fown_sid = sid;
file->f_security = fsec;
return 0;
@@ -338,8 +367,9 @@
static int may_context_mount_sb_relabel(u32 sid,
struct superblock_security_struct *sbsec,
- struct task_security_struct *tsec)
+ const struct cred *cred)
{
+ const struct task_security_struct *tsec = cred->security;
int rc;
rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
@@ -354,8 +384,9 @@
static int may_context_mount_inode_relabel(u32 sid,
struct superblock_security_struct *sbsec,
- struct task_security_struct *tsec)
+ const struct cred *cred)
{
+ const struct task_security_struct *tsec = cred->security;
int rc;
rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
FILESYSTEM__RELABELFROM, NULL);
@@ -553,8 +584,8 @@
static int selinux_set_mnt_opts(struct super_block *sb,
struct security_mnt_opts *opts)
{
+ const struct cred *cred = current_cred();
int rc = 0, i;
- struct task_security_struct *tsec = current->security;
struct superblock_security_struct *sbsec = sb->s_security;
const char *name = sb->s_type->name;
struct inode *inode = sbsec->sb->s_root->d_inode;
@@ -680,8 +711,7 @@
/* sets the context of the superblock for the fs being mounted. */
if (fscontext_sid) {
-
- rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec);
+ rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
if (rc)
goto out;
@@ -695,12 +725,14 @@
*/
if (context_sid) {
if (!fscontext_sid) {
- rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec);
+ rc = may_context_mount_sb_relabel(context_sid, sbsec,
+ cred);
if (rc)
goto out;
sbsec->sid = context_sid;
} else {
- rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec);
+ rc = may_context_mount_inode_relabel(context_sid, sbsec,
+ cred);
if (rc)
goto out;
}
@@ -712,7 +744,8 @@
}
if (rootcontext_sid) {
- rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec);
+ rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
+ cred);
if (rc)
goto out;
@@ -730,7 +763,7 @@
if (defcontext_sid != sbsec->def_sid) {
rc = may_context_mount_inode_relabel(defcontext_sid,
- sbsec, tsec);
+ sbsec, cred);
if (rc)
goto out;
}
@@ -1345,18 +1378,53 @@
return perm;
}
-/* Check permission betweeen a pair of tasks, e.g. signal checks,
- fork check, ptrace check, etc. */
-static int task_has_perm(struct task_struct *tsk1,
- struct task_struct *tsk2,
+/*
+ * Check permission between a pair of credentials
+ * fork check, ptrace check, etc.
+ */
+static int cred_has_perm(const struct cred *actor,
+ const struct cred *target,
u32 perms)
{
- struct task_security_struct *tsec1, *tsec2;
+ u32 asid = cred_sid(actor), tsid = cred_sid(target);
- tsec1 = tsk1->security;
- tsec2 = tsk2->security;
- return avc_has_perm(tsec1->sid, tsec2->sid,
- SECCLASS_PROCESS, perms, NULL);
+ return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL);
+}
+
+/*
+ * Check permission between a pair of tasks, e.g. signal checks,
+ * fork check, ptrace check, etc.
+ * tsk1 is the actor and tsk2 is the target
+ * - this uses the default subjective creds of tsk1
+ */
+static int task_has_perm(const struct task_struct *tsk1,
+ const struct task_struct *tsk2,
+ u32 perms)
+{
+ const struct task_security_struct *__tsec1, *__tsec2;
+ u32 sid1, sid2;
+
+ rcu_read_lock();
+ __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid;
+ __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid;
+ rcu_read_unlock();
+ return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL);
+}
+
+/*
+ * Check permission between current and another task, e.g. signal checks,
+ * fork check, ptrace check, etc.
+ * current is the actor and tsk2 is the target
+ * - this uses current's subjective creds
+ */
+static int current_has_perm(const struct task_struct *tsk,
+ u32 perms)
+{
+ u32 sid, tsid;
+
+ sid = current_sid();
+ tsid = task_sid(tsk);
+ return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL);
}
#if CAP_LAST_CAP > 63
@@ -1365,14 +1433,14 @@
/* Check whether a task is allowed to use a capability. */
static int task_has_capability(struct task_struct *tsk,
- int cap)
+ int cap, int audit)
{
- struct task_security_struct *tsec;
struct avc_audit_data ad;
+ struct av_decision avd;
u16 sclass;
+ u32 sid = task_sid(tsk);
u32 av = CAP_TO_MASK(cap);
-
- tsec = tsk->security;
+ int rc;
AVC_AUDIT_DATA_INIT(&ad, CAP);
ad.tsk = tsk;
@@ -1390,37 +1458,39 @@
"SELinux: out of range capability %d\n", cap);
BUG();
}
- return avc_has_perm(tsec->sid, tsec->sid, sclass, av, &ad);
+
+ rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd);
+ if (audit == SECURITY_CAP_AUDIT)
+ avc_audit(sid, sid, sclass, av, &avd, rc, &ad);
+ return rc;
}
/* Check whether a task is allowed to use a system operation. */
static int task_has_system(struct task_struct *tsk,
u32 perms)
{
- struct task_security_struct *tsec;
+ u32 sid = task_sid(tsk);
- tsec = tsk->security;
-
- return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
+ return avc_has_perm(sid, SECINITSID_KERNEL,
SECCLASS_SYSTEM, perms, NULL);
}
/* Check whether a task has a particular permission to an inode.
The 'adp' parameter is optional and allows other audit
data to be passed (e.g. the dentry). */
-static int inode_has_perm(struct task_struct *tsk,
+static int inode_has_perm(const struct cred *cred,
struct inode *inode,
u32 perms,
struct avc_audit_data *adp)
{
- struct task_security_struct *tsec;
struct inode_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid;
if (unlikely(IS_PRIVATE(inode)))
return 0;
- tsec = tsk->security;
+ sid = cred_sid(cred);
isec = inode->i_security;
if (!adp) {
@@ -1429,23 +1499,24 @@
ad.u.fs.inode = inode;
}
- return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
+ return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp);
}
/* Same as inode_has_perm, but pass explicit audit data containing
the dentry to help the auditing code to more easily generate the
pathname if needed. */
-static inline int dentry_has_perm(struct task_struct *tsk,
+static inline int dentry_has_perm(const struct cred *cred,
struct vfsmount *mnt,
struct dentry *dentry,
u32 av)
{
struct inode *inode = dentry->d_inode;
struct avc_audit_data ad;
+
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path.mnt = mnt;
ad.u.fs.path.dentry = dentry;
- return inode_has_perm(tsk, inode, av, &ad);
+ return inode_has_perm(cred, inode, av, &ad);
}
/* Check whether a task can use an open file descriptor to
@@ -1456,33 +1527,35 @@
has the same SID as the process. If av is zero, then
access to the file is not checked, e.g. for cases
where only the descriptor is affected like seek. */
-static int file_has_perm(struct task_struct *tsk,
- struct file *file,
- u32 av)
+static int file_has_perm(const struct cred *cred,
+ struct file *file,
+ u32 av)
{
- struct task_security_struct *tsec = tsk->security;
struct file_security_struct *fsec = file->f_security;
struct inode *inode = file->f_path.dentry->d_inode;
struct avc_audit_data ad;
+ u32 sid = cred_sid(cred);
int rc;
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path = file->f_path;
- if (tsec->sid != fsec->sid) {
- rc = avc_has_perm(tsec->sid, fsec->sid,
+ if (sid != fsec->sid) {
+ rc = avc_has_perm(sid, fsec->sid,
SECCLASS_FD,
FD__USE,
&ad);
if (rc)
- return rc;
+ goto out;
}
/* av is zero if only checking access to the descriptor. */
+ rc = 0;
if (av)
- return inode_has_perm(tsk, inode, av, &ad);
+ rc = inode_has_perm(cred, inode, av, &ad);
- return 0;
+out:
+ return rc;
}
/* Check whether a task can create a file. */
@@ -1490,36 +1563,36 @@
struct dentry *dentry,
u16 tclass)
{
- struct task_security_struct *tsec;
+ const struct cred *cred = current_cred();
+ const struct task_security_struct *tsec = cred->security;
struct inode_security_struct *dsec;
struct superblock_security_struct *sbsec;
- u32 newsid;
+ u32 sid, newsid;
struct avc_audit_data ad;
int rc;
- tsec = current->security;
dsec = dir->i_security;
sbsec = dir->i_sb->s_security;
+ sid = tsec->sid;
+ newsid = tsec->create_sid;
+
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path.dentry = dentry;
- rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
+ rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
DIR__ADD_NAME | DIR__SEARCH,
&ad);
if (rc)
return rc;
- if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
- newsid = tsec->create_sid;
- } else {
- rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
- &newsid);
+ if (!newsid || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) {
+ rc = security_transition_sid(sid, dsec->sid, tclass, &newsid);
if (rc)
return rc;
}
- rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
+ rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
if (rc)
return rc;
@@ -1532,11 +1605,9 @@
static int may_create_key(u32 ksid,
struct task_struct *ctx)
{
- struct task_security_struct *tsec;
+ u32 sid = task_sid(ctx);
- tsec = ctx->security;
-
- return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
+ return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
}
#define MAY_LINK 0
@@ -1549,13 +1620,12 @@
int kind)
{
- struct task_security_struct *tsec;
struct inode_security_struct *dsec, *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
u32 av;
int rc;
- tsec = current->security;
dsec = dir->i_security;
isec = dentry->d_inode->i_security;
@@ -1564,7 +1634,7 @@
av = DIR__SEARCH;
av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
- rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
+ rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad);
if (rc)
return rc;
@@ -1584,7 +1654,7 @@
return 0;
}
- rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
+ rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad);
return rc;
}
@@ -1593,14 +1663,13 @@
struct inode *new_dir,
struct dentry *new_dentry)
{
- struct task_security_struct *tsec;
struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
u32 av;
int old_is_dir, new_is_dir;
int rc;
- tsec = current->security;
old_dsec = old_dir->i_security;
old_isec = old_dentry->d_inode->i_security;
old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
@@ -1609,16 +1678,16 @@
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path.dentry = old_dentry;
- rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
+ rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
DIR__REMOVE_NAME | DIR__SEARCH, &ad);
if (rc)
return rc;
- rc = avc_has_perm(tsec->sid, old_isec->sid,
+ rc = avc_has_perm(sid, old_isec->sid,
old_isec->sclass, FILE__RENAME, &ad);
if (rc)
return rc;
if (old_is_dir && new_dir != old_dir) {
- rc = avc_has_perm(tsec->sid, old_isec->sid,
+ rc = avc_has_perm(sid, old_isec->sid,
old_isec->sclass, DIR__REPARENT, &ad);
if (rc)
return rc;
@@ -1628,13 +1697,13 @@
av = DIR__ADD_NAME | DIR__SEARCH;
if (new_dentry->d_inode)
av |= DIR__REMOVE_NAME;
- rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
+ rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
if (rc)
return rc;
if (new_dentry->d_inode) {
new_isec = new_dentry->d_inode->i_security;
new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
- rc = avc_has_perm(tsec->sid, new_isec->sid,
+ rc = avc_has_perm(sid, new_isec->sid,
new_isec->sclass,
(new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
if (rc)
@@ -1645,18 +1714,16 @@
}
/* Check whether a task can perform a filesystem operation. */
-static int superblock_has_perm(struct task_struct *tsk,
+static int superblock_has_perm(const struct cred *cred,
struct super_block *sb,
u32 perms,
struct avc_audit_data *ad)
{
- struct task_security_struct *tsec;
struct superblock_security_struct *sbsec;
+ u32 sid = cred_sid(cred);
- tsec = tsk->security;
sbsec = sb->s_security;
- return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
- perms, ad);
+ return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
}
/* Convert a Linux mode and permission mask to an access vector. */
@@ -1687,35 +1754,6 @@
return av;
}
-/*
- * Convert a file mask to an access vector and include the correct open
- * open permission.
- */
-static inline u32 open_file_mask_to_av(int mode, int mask)
-{
- u32 av = file_mask_to_av(mode, mask);
-
- if (selinux_policycap_openperm) {
- /*
- * lnk files and socks do not really have an 'open'
- */
- if (S_ISREG(mode))
- av |= FILE__OPEN;
- else if (S_ISCHR(mode))
- av |= CHR_FILE__OPEN;
- else if (S_ISBLK(mode))
- av |= BLK_FILE__OPEN;
- else if (S_ISFIFO(mode))
- av |= FIFO_FILE__OPEN;
- else if (S_ISDIR(mode))
- av |= DIR__OPEN;
- else
- printk(KERN_ERR "SELinux: WARNING: inside %s with "
- "unknown mode:%x\n", __func__, mode);
- }
- return av;
-}
-
/* Convert a Linux file to an access vector. */
static inline u32 file_to_av(struct file *file)
{
@@ -1739,6 +1777,36 @@
return av;
}
+/*
+ * Convert a file to an access vector and include the correct open
+ * open permission.
+ */
+static inline u32 open_file_to_av(struct file *file)
+{
+ u32 av = file_to_av(file);
+
+ if (selinux_policycap_openperm) {
+ mode_t mode = file->f_path.dentry->d_inode->i_mode;
+ /*
+ * lnk files and socks do not really have an 'open'
+ */
+ if (S_ISREG(mode))
+ av |= FILE__OPEN;
+ else if (S_ISCHR(mode))
+ av |= CHR_FILE__OPEN;
+ else if (S_ISBLK(mode))
+ av |= BLK_FILE__OPEN;
+ else if (S_ISFIFO(mode))
+ av |= FIFO_FILE__OPEN;
+ else if (S_ISDIR(mode))
+ av |= DIR__OPEN;
+ else
+ printk(KERN_ERR "SELinux: WARNING: inside %s with "
+ "unknown mode:%o\n", __func__, mode);
+ }
+ return av;
+}
+
/* Hook functions begin here. */
static int selinux_ptrace_may_access(struct task_struct *child,
@@ -1751,13 +1819,12 @@
return rc;
if (mode == PTRACE_MODE_READ) {
- struct task_security_struct *tsec = current->security;
- struct task_security_struct *csec = child->security;
- return avc_has_perm(tsec->sid, csec->sid,
- SECCLASS_FILE, FILE__READ, NULL);
+ u32 sid = current_sid();
+ u32 csid = task_sid(child);
+ return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);
}
- return task_has_perm(current, child, PROCESS__PTRACE);
+ return current_has_perm(child, PROCESS__PTRACE);
}
static int selinux_ptrace_traceme(struct task_struct *parent)
@@ -1776,40 +1843,37 @@
{
int error;
- error = task_has_perm(current, target, PROCESS__GETCAP);
+ error = current_has_perm(target, PROCESS__GETCAP);
if (error)
return error;
return secondary_ops->capget(target, effective, inheritable, permitted);
}
-static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
- kernel_cap_t *inheritable, kernel_cap_t *permitted)
+static int selinux_capset(struct cred *new, const struct cred *old,
+ const kernel_cap_t *effective,
+ const kernel_cap_t *inheritable,
+ const kernel_cap_t *permitted)
{
int error;
- error = secondary_ops->capset_check(target, effective, inheritable, permitted);
+ error = secondary_ops->capset(new, old,
+ effective, inheritable, permitted);
if (error)
return error;
- return task_has_perm(current, target, PROCESS__SETCAP);
+ return cred_has_perm(old, new, PROCESS__SETCAP);
}
-static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
- kernel_cap_t *inheritable, kernel_cap_t *permitted)
-{
- secondary_ops->capset_set(target, effective, inheritable, permitted);
-}
-
-static int selinux_capable(struct task_struct *tsk, int cap)
+static int selinux_capable(struct task_struct *tsk, int cap, int audit)
{
int rc;
- rc = secondary_ops->capable(tsk, cap);
+ rc = secondary_ops->capable(tsk, cap, audit);
if (rc)
return rc;
- return task_has_capability(tsk, cap);
+ return task_has_capability(tsk, cap, audit);
}
static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
@@ -1857,15 +1921,14 @@
{
int error = 0;
u32 av;
- struct task_security_struct *tsec;
- u32 tsid;
+ u32 tsid, sid;
int rc;
rc = secondary_ops->sysctl(table, op);
if (rc)
return rc;
- tsec = current->security;
+ sid = current_sid();
rc = selinux_sysctl_get_sid(table, (op == 0001) ?
SECCLASS_DIR : SECCLASS_FILE, &tsid);
@@ -1877,7 +1940,7 @@
/* The op values are "defined" in sysctl.c, thereby creating
* a bad coupling between this module and sysctl.c */
if (op == 001) {
- error = avc_has_perm(tsec->sid, tsid,
+ error = avc_has_perm(sid, tsid,
SECCLASS_DIR, DIR__SEARCH, NULL);
} else {
av = 0;
@@ -1886,7 +1949,7 @@
if (op & 002)
av |= FILE__WRITE;
if (av)
- error = avc_has_perm(tsec->sid, tsid,
+ error = avc_has_perm(sid, tsid,
SECCLASS_FILE, av, NULL);
}
@@ -1895,6 +1958,7 @@
static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
{
+ const struct cred *cred = current_cred();
int rc = 0;
if (!sb)
@@ -1906,14 +1970,12 @@
case Q_QUOTAOFF:
case Q_SETINFO:
case Q_SETQUOTA:
- rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD,
- NULL);
+ rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
break;
case Q_GETFMT:
case Q_GETINFO:
case Q_GETQUOTA:
- rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET,
- NULL);
+ rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
break;
default:
rc = 0; /* let the kernel handle invalid cmds */
@@ -1924,7 +1986,9 @@
static int selinux_quota_on(struct dentry *dentry)
{
- return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
+ const struct cred *cred = current_cred();
+
+ return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON);
}
static int selinux_syslog(int type)
@@ -1972,16 +2036,8 @@
static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
{
int rc, cap_sys_admin = 0;
- struct task_security_struct *tsec = current->security;
- rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
- if (rc == 0)
- rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
- SECCLASS_CAPABILITY,
- CAP_TO_MASK(CAP_SYS_ADMIN),
- 0,
- NULL);
-
+ rc = selinux_capable(current, CAP_SYS_ADMIN, SECURITY_CAP_NOAUDIT);
if (rc == 0)
cap_sys_admin = 1;
@@ -1990,59 +2046,45 @@
/* binprm security operations */
-static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
+static int selinux_bprm_set_creds(struct linux_binprm *bprm)
{
- struct bprm_security_struct *bsec;
-
- bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
- if (!bsec)
- return -ENOMEM;
-
- bsec->sid = SECINITSID_UNLABELED;
- bsec->set = 0;
-
- bprm->security = bsec;
- return 0;
-}
-
-static int selinux_bprm_set_security(struct linux_binprm *bprm)
-{
- struct task_security_struct *tsec;
- struct inode *inode = bprm->file->f_path.dentry->d_inode;
+ const struct task_security_struct *old_tsec;
+ struct task_security_struct *new_tsec;
struct inode_security_struct *isec;
- struct bprm_security_struct *bsec;
- u32 newsid;
struct avc_audit_data ad;
+ struct inode *inode = bprm->file->f_path.dentry->d_inode;
int rc;
- rc = secondary_ops->bprm_set_security(bprm);
+ rc = secondary_ops->bprm_set_creds(bprm);
if (rc)
return rc;
- bsec = bprm->security;
-
- if (bsec->set)
+ /* SELinux context only depends on initial program or script and not
+ * the script interpreter */
+ if (bprm->cred_prepared)
return 0;
- tsec = current->security;
+ old_tsec = current_security();
+ new_tsec = bprm->cred->security;
isec = inode->i_security;
/* Default to the current task SID. */
- bsec->sid = tsec->sid;
+ new_tsec->sid = old_tsec->sid;
+ new_tsec->osid = old_tsec->sid;
/* Reset fs, key, and sock SIDs on execve. */
- tsec->create_sid = 0;
- tsec->keycreate_sid = 0;
- tsec->sockcreate_sid = 0;
+ new_tsec->create_sid = 0;
+ new_tsec->keycreate_sid = 0;
+ new_tsec->sockcreate_sid = 0;
- if (tsec->exec_sid) {
- newsid = tsec->exec_sid;
+ if (old_tsec->exec_sid) {
+ new_tsec->sid = old_tsec->exec_sid;
/* Reset exec SID on execve. */
- tsec->exec_sid = 0;
+ new_tsec->exec_sid = 0;
} else {
/* Check for a default transition on this program. */
- rc = security_transition_sid(tsec->sid, isec->sid,
- SECCLASS_PROCESS, &newsid);
+ rc = security_transition_sid(old_tsec->sid, isec->sid,
+ SECCLASS_PROCESS, &new_tsec->sid);
if (rc)
return rc;
}
@@ -2051,33 +2093,63 @@
ad.u.fs.path = bprm->file->f_path;
if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
- newsid = tsec->sid;
+ new_tsec->sid = old_tsec->sid;
- if (tsec->sid == newsid) {
- rc = avc_has_perm(tsec->sid, isec->sid,
+ if (new_tsec->sid == old_tsec->sid) {
+ rc = avc_has_perm(old_tsec->sid, isec->sid,
SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
if (rc)
return rc;
} else {
/* Check permissions for the transition. */
- rc = avc_has_perm(tsec->sid, newsid,
+ rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
if (rc)
return rc;
- rc = avc_has_perm(newsid, isec->sid,
+ rc = avc_has_perm(new_tsec->sid, isec->sid,
SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
if (rc)
return rc;
- /* Clear any possibly unsafe personality bits on exec: */
- current->personality &= ~PER_CLEAR_ON_SETID;
+ /* Check for shared state */
+ if (bprm->unsafe & LSM_UNSAFE_SHARE) {
+ rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
+ SECCLASS_PROCESS, PROCESS__SHARE,
+ NULL);
+ if (rc)
+ return -EPERM;
+ }
- /* Set the security field to the new SID. */
- bsec->sid = newsid;
+ /* Make sure that anyone attempting to ptrace over a task that
+ * changes its SID has the appropriate permit */
+ if (bprm->unsafe &
+ (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
+ struct task_struct *tracer;
+ struct task_security_struct *sec;
+ u32 ptsid = 0;
+
+ rcu_read_lock();
+ tracer = tracehook_tracer_task(current);
+ if (likely(tracer != NULL)) {
+ sec = __task_cred(tracer)->security;
+ ptsid = sec->sid;
+ }
+ rcu_read_unlock();
+
+ if (ptsid != 0) {
+ rc = avc_has_perm(ptsid, new_tsec->sid,
+ SECCLASS_PROCESS,
+ PROCESS__PTRACE, NULL);
+ if (rc)
+ return -EPERM;
+ }
+ }
+
+ /* Clear any possibly unsafe personality bits on exec: */
+ bprm->per_clear |= PER_CLEAR_ON_SETID;
}
- bsec->set = 1;
return 0;
}
@@ -2086,35 +2158,34 @@
return secondary_ops->bprm_check_security(bprm);
}
-
static int selinux_bprm_secureexec(struct linux_binprm *bprm)
{
- struct task_security_struct *tsec = current->security;
+ const struct cred *cred = current_cred();
+ const struct task_security_struct *tsec = cred->security;
+ u32 sid, osid;
int atsecure = 0;
- if (tsec->osid != tsec->sid) {
+ sid = tsec->sid;
+ osid = tsec->osid;
+
+ if (osid != sid) {
/* Enable secure mode for SIDs transitions unless
the noatsecure permission is granted between
the two SIDs, i.e. ahp returns 0. */
- atsecure = avc_has_perm(tsec->osid, tsec->sid,
- SECCLASS_PROCESS,
- PROCESS__NOATSECURE, NULL);
+ atsecure = avc_has_perm(osid, sid,
+ SECCLASS_PROCESS,
+ PROCESS__NOATSECURE, NULL);
}
return (atsecure || secondary_ops->bprm_secureexec(bprm));
}
-static void selinux_bprm_free_security(struct linux_binprm *bprm)
-{
- kfree(bprm->security);
- bprm->security = NULL;
-}
-
extern struct vfsmount *selinuxfs_mount;
extern struct dentry *selinux_null;
/* Derived from fs/exec.c:flush_old_files. */
-static inline void flush_unauthorized_files(struct files_struct *files)
+static inline void flush_unauthorized_files(const struct cred *cred,
+ struct files_struct *files)
{
struct avc_audit_data ad;
struct file *file, *devnull = NULL;
@@ -2136,7 +2207,7 @@
interested in the inode-based check here. */
file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list);
inode = file->f_path.dentry->d_inode;
- if (inode_has_perm(current, inode,
+ if (inode_has_perm(cred, inode,
FILE__READ | FILE__WRITE, NULL)) {
drop_tty = 1;
}
@@ -2171,7 +2242,7 @@
file = fget(i);
if (!file)
continue;
- if (file_has_perm(current,
+ if (file_has_perm(cred,
file,
file_to_av(file))) {
sys_close(i);
@@ -2185,7 +2256,10 @@
if (devnull) {
get_file(devnull);
} else {
- devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
+ devnull = dentry_open(
+ dget(selinux_null),
+ mntget(selinuxfs_mount),
+ O_RDWR, cred);
if (IS_ERR(devnull)) {
devnull = NULL;
put_unused_fd(fd);
@@ -2204,94 +2278,78 @@
spin_unlock(&files->file_lock);
}
-static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
+/*
+ * Prepare a process for imminent new credential changes due to exec
+ */
+static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
{
- struct task_security_struct *tsec;
- struct bprm_security_struct *bsec;
- u32 sid;
- int rc;
+ struct task_security_struct *new_tsec;
+ struct rlimit *rlim, *initrlim;
+ int rc, i;
- secondary_ops->bprm_apply_creds(bprm, unsafe);
+ secondary_ops->bprm_committing_creds(bprm);
- tsec = current->security;
+ new_tsec = bprm->cred->security;
+ if (new_tsec->sid == new_tsec->osid)
+ return;
- bsec = bprm->security;
- sid = bsec->sid;
+ /* Close files for which the new task SID is not authorized. */
+ flush_unauthorized_files(bprm->cred, current->files);
- tsec->osid = tsec->sid;
- bsec->unsafe = 0;
- if (tsec->sid != sid) {
- /* Check for shared state. If not ok, leave SID
- unchanged and kill. */
- if (unsafe & LSM_UNSAFE_SHARE) {
- rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
- PROCESS__SHARE, NULL);
- if (rc) {
- bsec->unsafe = 1;
- return;
- }
+ /* Always clear parent death signal on SID transitions. */
+ current->pdeath_signal = 0;
+
+ /* Check whether the new SID can inherit resource limits from the old
+ * SID. If not, reset all soft limits to the lower of the current
+ * task's hard limit and the init task's soft limit.
+ *
+ * Note that the setting of hard limits (even to lower them) can be
+ * controlled by the setrlimit check. The inclusion of the init task's
+ * soft limit into the computation is to avoid resetting soft limits
+ * higher than the default soft limit for cases where the default is
+ * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
+ */
+ rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
+ PROCESS__RLIMITINH, NULL);
+ if (rc) {
+ for (i = 0; i < RLIM_NLIMITS; i++) {
+ rlim = current->signal->rlim + i;
+ initrlim = init_task.signal->rlim + i;
+ rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
}
-
- /* Check for ptracing, and update the task SID if ok.
- Otherwise, leave SID unchanged and kill. */
- if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
- struct task_struct *tracer;
- struct task_security_struct *sec;
- u32 ptsid = 0;
-
- rcu_read_lock();
- tracer = tracehook_tracer_task(current);
- if (likely(tracer != NULL)) {
- sec = tracer->security;
- ptsid = sec->sid;
- }
- rcu_read_unlock();
-
- if (ptsid != 0) {
- rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
- PROCESS__PTRACE, NULL);
- if (rc) {
- bsec->unsafe = 1;
- return;
- }
- }
- }
- tsec->sid = sid;
+ update_rlimit_cpu(rlim->rlim_cur);
}
}
/*
- * called after apply_creds without the task lock held
+ * Clean up the process immediately after the installation of new credentials
+ * due to exec
*/
-static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
+static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
{
- struct task_security_struct *tsec;
- struct rlimit *rlim, *initrlim;
+ const struct task_security_struct *tsec = current_security();
struct itimerval itimer;
- struct bprm_security_struct *bsec;
+ struct sighand_struct *psig;
+ u32 osid, sid;
int rc, i;
+ unsigned long flags;
- tsec = current->security;
- bsec = bprm->security;
+ secondary_ops->bprm_committed_creds(bprm);
- if (bsec->unsafe) {
- force_sig_specific(SIGKILL, current);
- return;
- }
- if (tsec->osid == tsec->sid)
+ osid = tsec->osid;
+ sid = tsec->sid;
+
+ if (sid == osid)
return;
- /* Close files for which the new task SID is not authorized. */
- flush_unauthorized_files(current->files);
-
- /* Check whether the new SID can inherit signal state
- from the old SID. If not, clear itimers to avoid
- subsequent signal generation and flush and unblock
- signals. This must occur _after_ the task SID has
- been updated so that any kill done after the flush
- will be checked against the new SID. */
- rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
- PROCESS__SIGINH, NULL);
+ /* Check whether the new SID can inherit signal state from the old SID.
+ * If not, clear itimers to avoid subsequent signal generation and
+ * flush and unblock signals.
+ *
+ * This must occur _after_ the task SID has been updated so that any
+ * kill done after the flush will be checked against the new SID.
+ */
+ rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
if (rc) {
memset(&itimer, 0, sizeof itimer);
for (i = 0; i < 3; i++)
@@ -2304,33 +2362,14 @@
spin_unlock_irq(¤t->sighand->siglock);
}
- /* Always clear parent death signal on SID transitions. */
- current->pdeath_signal = 0;
-
- /* Check whether the new SID can inherit resource limits
- from the old SID. If not, reset all soft limits to
- the lower of the current task's hard limit and the init
- task's soft limit. Note that the setting of hard limits
- (even to lower them) can be controlled by the setrlimit
- check. The inclusion of the init task's soft limit into
- the computation is to avoid resetting soft limits higher
- than the default soft limit for cases where the default
- is lower than the hard limit, e.g. RLIMIT_CORE or
- RLIMIT_STACK.*/
- rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
- PROCESS__RLIMITINH, NULL);
- if (rc) {
- for (i = 0; i < RLIM_NLIMITS; i++) {
- rlim = current->signal->rlim + i;
- initrlim = init_task.signal->rlim+i;
- rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
- }
- update_rlimit_cpu(rlim->rlim_cur);
- }
-
- /* Wake up the parent if it is waiting so that it can
- recheck wait permission to the new task SID. */
+ /* Wake up the parent if it is waiting so that it can recheck
+ * wait permission to the new task SID. */
+ read_lock_irq(&tasklist_lock);
+ psig = current->parent->sighand;
+ spin_lock_irqsave(&psig->siglock, flags);
wake_up_interruptible(¤t->parent->signal->wait_chldexit);
+ spin_unlock_irqrestore(&psig->siglock, flags);
+ read_unlock_irq(&tasklist_lock);
}
/* superblock security operations */
@@ -2437,6 +2476,7 @@
static int selinux_sb_kern_mount(struct super_block *sb, void *data)
{
+ const struct cred *cred = current_cred();
struct avc_audit_data ad;
int rc;
@@ -2446,16 +2486,17 @@
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path.dentry = sb->s_root;
- return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
+ return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
}
static int selinux_sb_statfs(struct dentry *dentry)
{
+ const struct cred *cred = current_cred();
struct avc_audit_data ad;
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path.dentry = dentry->d_sb->s_root;
- return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
+ return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
}
static int selinux_mount(char *dev_name,
@@ -2464,6 +2505,7 @@
unsigned long flags,
void *data)
{
+ const struct cred *cred = current_cred();
int rc;
rc = secondary_ops->sb_mount(dev_name, path, type, flags, data);
@@ -2471,22 +2513,23 @@
return rc;
if (flags & MS_REMOUNT)
- return superblock_has_perm(current, path->mnt->mnt_sb,
+ return superblock_has_perm(cred, path->mnt->mnt_sb,
FILESYSTEM__REMOUNT, NULL);
else
- return dentry_has_perm(current, path->mnt, path->dentry,
+ return dentry_has_perm(cred, path->mnt, path->dentry,
FILE__MOUNTON);
}
static int selinux_umount(struct vfsmount *mnt, int flags)
{
+ const struct cred *cred = current_cred();
int rc;
rc = secondary_ops->sb_umount(mnt, flags);
if (rc)
return rc;
- return superblock_has_perm(current, mnt->mnt_sb,
+ return superblock_has_perm(cred, mnt->mnt_sb,
FILESYSTEM__UNMOUNT, NULL);
}
@@ -2506,21 +2549,22 @@
char **name, void **value,
size_t *len)
{
- struct task_security_struct *tsec;
+ const struct cred *cred = current_cred();
+ const struct task_security_struct *tsec = cred->security;
struct inode_security_struct *dsec;
struct superblock_security_struct *sbsec;
- u32 newsid, clen;
+ u32 sid, newsid, clen;
int rc;
char *namep = NULL, *context;
- tsec = current->security;
dsec = dir->i_security;
sbsec = dir->i_sb->s_security;
- if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
- newsid = tsec->create_sid;
- } else {
- rc = security_transition_sid(tsec->sid, dsec->sid,
+ sid = tsec->sid;
+ newsid = tsec->create_sid;
+
+ if (!newsid || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) {
+ rc = security_transition_sid(sid, dsec->sid,
inode_mode_to_security_class(inode->i_mode),
&newsid);
if (rc) {
@@ -2623,21 +2667,25 @@
static int selinux_inode_readlink(struct dentry *dentry)
{
- return dentry_has_perm(current, NULL, dentry, FILE__READ);
+ const struct cred *cred = current_cred();
+
+ return dentry_has_perm(cred, NULL, dentry, FILE__READ);
}
static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
{
+ const struct cred *cred = current_cred();
int rc;
rc = secondary_ops->inode_follow_link(dentry, nameidata);
if (rc)
return rc;
- return dentry_has_perm(current, NULL, dentry, FILE__READ);
+ return dentry_has_perm(cred, NULL, dentry, FILE__READ);
}
static int selinux_inode_permission(struct inode *inode, int mask)
{
+ const struct cred *cred = current_cred();
int rc;
rc = secondary_ops->inode_permission(inode, mask);
@@ -2649,12 +2697,13 @@
return 0;
}
- return inode_has_perm(current, inode,
- open_file_mask_to_av(inode->i_mode, mask), NULL);
+ return inode_has_perm(cred, inode,
+ file_mask_to_av(inode->i_mode, mask), NULL);
}
static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
{
+ const struct cred *cred = current_cred();
int rc;
rc = secondary_ops->inode_setattr(dentry, iattr);
@@ -2666,18 +2715,22 @@
if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
ATTR_ATIME_SET | ATTR_MTIME_SET))
- return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
+ return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
- return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
+ return dentry_has_perm(cred, NULL, dentry, FILE__WRITE);
}
static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{
- return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
+ const struct cred *cred = current_cred();
+
+ return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR);
}
static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
{
+ const struct cred *cred = current_cred();
+
if (!strncmp(name, XATTR_SECURITY_PREFIX,
sizeof XATTR_SECURITY_PREFIX - 1)) {
if (!strcmp(name, XATTR_NAME_CAPS)) {
@@ -2692,18 +2745,17 @@
/* Not an attribute we recognize, so just check the
ordinary setattr permission. */
- return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
+ return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
}
static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
- struct task_security_struct *tsec = current->security;
struct inode *inode = dentry->d_inode;
struct inode_security_struct *isec = inode->i_security;
struct superblock_security_struct *sbsec;
struct avc_audit_data ad;
- u32 newsid;
+ u32 newsid, sid = current_sid();
int rc = 0;
if (strcmp(name, XATTR_NAME_SELINUX))
@@ -2719,7 +2771,7 @@
AVC_AUDIT_DATA_INIT(&ad, FS);
ad.u.fs.path.dentry = dentry;
- rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
+ rc = avc_has_perm(sid, isec->sid, isec->sclass,
FILE__RELABELFROM, &ad);
if (rc)
return rc;
@@ -2733,12 +2785,12 @@
if (rc)
return rc;
- rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
+ rc = avc_has_perm(sid, newsid, isec->sclass,
FILE__RELABELTO, &ad);
if (rc)
return rc;
- rc = security_validate_transition(isec->sid, newsid, tsec->sid,
+ rc = security_validate_transition(isec->sid, newsid, sid,
isec->sclass);
if (rc)
return rc;
@@ -2778,12 +2830,16 @@
static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
{
- return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
+ const struct cred *cred = current_cred();
+
+ return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
}
static int selinux_inode_listxattr(struct dentry *dentry)
{
- return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
+ const struct cred *cred = current_cred();
+
+ return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
}
static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
@@ -2806,7 +2862,6 @@
u32 size;
int error;
char *context = NULL;
- struct task_security_struct *tsec = current->security;
struct inode_security_struct *isec = inode->i_security;
if (strcmp(name, XATTR_SELINUX_SUFFIX))
@@ -2821,13 +2876,7 @@
* and lack of permission just means that we fall back to the
* in-core context value, not a denial.
*/
- error = secondary_ops->capable(current, CAP_MAC_ADMIN);
- if (!error)
- error = avc_has_perm_noaudit(tsec->sid, tsec->sid,
- SECCLASS_CAPABILITY2,
- CAPABILITY2__MAC_ADMIN,
- 0,
- NULL);
+ error = selinux_capable(current, CAP_MAC_ADMIN, SECURITY_CAP_NOAUDIT);
if (!error)
error = security_sid_to_context_force(isec->sid, &context,
&size);
@@ -2894,6 +2943,7 @@
static int selinux_revalidate_file_permission(struct file *file, int mask)
{
+ const struct cred *cred = current_cred();
int rc;
struct inode *inode = file->f_path.dentry->d_inode;
@@ -2906,7 +2956,7 @@
if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
mask |= MAY_APPEND;
- rc = file_has_perm(current, file,
+ rc = file_has_perm(cred, file,
file_mask_to_av(inode->i_mode, mask));
if (rc)
return rc;
@@ -2917,16 +2967,16 @@
static int selinux_file_permission(struct file *file, int mask)
{
struct inode *inode = file->f_path.dentry->d_inode;
- struct task_security_struct *tsec = current->security;
struct file_security_struct *fsec = file->f_security;
struct inode_security_struct *isec = inode->i_security;
+ u32 sid = current_sid();
if (!mask) {
/* No permission to check. Existence test. */
return 0;
}
- if (tsec->sid == fsec->sid && fsec->isid == isec->sid
+ if (sid == fsec->sid && fsec->isid == isec->sid
&& fsec->pseqno == avc_policy_seqno())
return selinux_netlbl_inode_permission(inode, mask);
@@ -2946,6 +2996,7 @@
static int selinux_file_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
+ const struct cred *cred = current_cred();
u32 av = 0;
if (_IOC_DIR(cmd) & _IOC_WRITE)
@@ -2955,11 +3006,14 @@
if (!av)
av = FILE__IOCTL;
- return file_has_perm(current, file, av);
+ return file_has_perm(cred, file, av);
}
static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
{
+ const struct cred *cred = current_cred();
+ int rc = 0;
+
#ifndef CONFIG_PPC32
if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
/*
@@ -2967,9 +3021,9 @@
* private file mapping that will also be writable.
* This has an additional check.
*/
- int rc = task_has_perm(current, current, PROCESS__EXECMEM);
+ rc = cred_has_perm(cred, cred, PROCESS__EXECMEM);
if (rc)
- return rc;
+ goto error;
}
#endif
@@ -2984,9 +3038,11 @@
if (prot & PROT_EXEC)
av |= FILE__EXECUTE;
- return file_has_perm(current, file, av);
+ return file_has_perm(cred, file, av);
}
- return 0;
+
+error:
+ return rc;
}
static int selinux_file_mmap(struct file *file, unsigned long reqprot,
@@ -2994,7 +3050,7 @@
unsigned long addr, unsigned long addr_only)
{
int rc = 0;
- u32 sid = ((struct task_security_struct *)(current->security))->sid;
+ u32 sid = current_sid();
if (addr < mmap_min_addr)
rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
@@ -3013,6 +3069,7 @@
unsigned long reqprot,
unsigned long prot)
{
+ const struct cred *cred = current_cred();
int rc;
rc = secondary_ops->file_mprotect(vma, reqprot, prot);
@@ -3027,12 +3084,11 @@
rc = 0;
if (vma->vm_start >= vma->vm_mm->start_brk &&
vma->vm_end <= vma->vm_mm->brk) {
- rc = task_has_perm(current, current,
- PROCESS__EXECHEAP);
+ rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP);
} else if (!vma->vm_file &&
vma->vm_start <= vma->vm_mm->start_stack &&
vma->vm_end >= vma->vm_mm->start_stack) {
- rc = task_has_perm(current, current, PROCESS__EXECSTACK);
+ rc = current_has_perm(current, PROCESS__EXECSTACK);
} else if (vma->vm_file && vma->anon_vma) {
/*
* We are making executable a file mapping that has
@@ -3041,8 +3097,7 @@
* modified content. This typically should only
* occur for text relocations.
*/
- rc = file_has_perm(current, vma->vm_file,
- FILE__EXECMOD);
+ rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
}
if (rc)
return rc;
@@ -3054,12 +3109,15 @@
static int selinux_file_lock(struct file *file, unsigned int cmd)
{
- return file_has_perm(current, file, FILE__LOCK);
+ const struct cred *cred = current_cred();
+
+ return file_has_perm(cred, file, FILE__LOCK);
}
static int selinux_file_fcntl(struct file *file, unsigned int cmd,
unsigned long arg)
{
+ const struct cred *cred = current_cred();
int err = 0;
switch (cmd) {
@@ -3070,7 +3128,7 @@
}
if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
- err = file_has_perm(current, file, FILE__WRITE);
+ err = file_has_perm(cred, file, FILE__WRITE);
break;
}
/* fall through */
@@ -3080,7 +3138,7 @@
case F_GETOWN:
case F_GETSIG:
/* Just check FD__USE permission */
- err = file_has_perm(current, file, 0);
+ err = file_has_perm(cred, file, 0);
break;
case F_GETLK:
case F_SETLK:
@@ -3094,7 +3152,7 @@
err = -EINVAL;
break;
}
- err = file_has_perm(current, file, FILE__LOCK);
+ err = file_has_perm(cred, file, FILE__LOCK);
break;
}
@@ -3103,12 +3161,10 @@
static int selinux_file_set_fowner(struct file *file)
{
- struct task_security_struct *tsec;
struct file_security_struct *fsec;
- tsec = current->security;
fsec = file->f_security;
- fsec->fown_sid = tsec->sid;
+ fsec->fown_sid = current_sid();
return 0;
}
@@ -3117,14 +3173,13 @@
struct fown_struct *fown, int signum)
{
struct file *file;
+ u32 sid = current_sid();
u32 perm;
- struct task_security_struct *tsec;
struct file_security_struct *fsec;
/* struct fown_struct is never outside the context of a struct file */
file = container_of(fown, struct file, f_owner);
- tsec = tsk->security;
fsec = file->f_security;
if (!signum)
@@ -3132,20 +3187,23 @@
else
perm = signal_to_av(signum);
- return avc_has_perm(fsec->fown_sid, tsec->sid,
+ return avc_has_perm(fsec->fown_sid, sid,
SECCLASS_PROCESS, perm, NULL);
}
static int selinux_file_receive(struct file *file)
{
- return file_has_perm(current, file, file_to_av(file));
+ const struct cred *cred = current_cred();
+
+ return file_has_perm(cred, file, file_to_av(file));
}
-static int selinux_dentry_open(struct file *file)
+static int selinux_dentry_open(struct file *file, const struct cred *cred)
{
struct file_security_struct *fsec;
struct inode *inode;
struct inode_security_struct *isec;
+
inode = file->f_path.dentry->d_inode;
fsec = file->f_security;
isec = inode->i_security;
@@ -3166,7 +3224,7 @@
* new inode label or new policy.
* This check is not redundant - do not remove.
*/
- return inode_has_perm(current, inode, file_to_av(file), NULL);
+ return inode_has_perm(cred, inode, open_file_to_av(file), NULL);
}
/* task security operations */
@@ -3179,36 +3237,88 @@
if (rc)
return rc;
- return task_has_perm(current, current, PROCESS__FORK);
+ return current_has_perm(current, PROCESS__FORK);
}
-static int selinux_task_alloc_security(struct task_struct *tsk)
+/*
+ * detach and free the LSM part of a set of credentials
+ */
+static void selinux_cred_free(struct cred *cred)
{
- struct task_security_struct *tsec1, *tsec2;
- int rc;
+ struct task_security_struct *tsec = cred->security;
+ cred->security = NULL;
+ kfree(tsec);
+}
- tsec1 = current->security;
+/*
+ * prepare a new set of credentials for modification
+ */
+static int selinux_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ const struct task_security_struct *old_tsec;
+ struct task_security_struct *tsec;
- rc = task_alloc_security(tsk);
- if (rc)
- return rc;
- tsec2 = tsk->security;
+ old_tsec = old->security;
- tsec2->osid = tsec1->osid;
- tsec2->sid = tsec1->sid;
+ tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp);
+ if (!tsec)
+ return -ENOMEM;
- /* Retain the exec, fs, key, and sock SIDs across fork */
- tsec2->exec_sid = tsec1->exec_sid;
- tsec2->create_sid = tsec1->create_sid;
- tsec2->keycreate_sid = tsec1->keycreate_sid;
- tsec2->sockcreate_sid = tsec1->sockcreate_sid;
-
+ new->security = tsec;
return 0;
}
-static void selinux_task_free_security(struct task_struct *tsk)
+/*
+ * commit new credentials
+ */
+static void selinux_cred_commit(struct cred *new, const struct cred *old)
{
- task_free_security(tsk);
+ secondary_ops->cred_commit(new, old);
+}
+
+/*
+ * set the security data for a kernel service
+ * - all the creation contexts are set to unlabelled
+ */
+static int selinux_kernel_act_as(struct cred *new, u32 secid)
+{
+ struct task_security_struct *tsec = new->security;
+ u32 sid = current_sid();
+ int ret;
+
+ ret = avc_has_perm(sid, secid,
+ SECCLASS_KERNEL_SERVICE,
+ KERNEL_SERVICE__USE_AS_OVERRIDE,
+ NULL);
+ if (ret == 0) {
+ tsec->sid = secid;
+ tsec->create_sid = 0;
+ tsec->keycreate_sid = 0;
+ tsec->sockcreate_sid = 0;
+ }
+ return ret;
+}
+
+/*
+ * set the file creation context in a security record to the same as the
+ * objective context of the specified inode
+ */
+static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
+{
+ struct inode_security_struct *isec = inode->i_security;
+ struct task_security_struct *tsec = new->security;
+ u32 sid = current_sid();
+ int ret;
+
+ ret = avc_has_perm(sid, isec->sid,
+ SECCLASS_KERNEL_SERVICE,
+ KERNEL_SERVICE__CREATE_FILES_AS,
+ NULL);
+
+ if (ret == 0)
+ tsec->create_sid = isec->sid;
+ return 0;
}
static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
@@ -3222,9 +3332,10 @@
return 0;
}
-static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
+static int selinux_task_fix_setuid(struct cred *new, const struct cred *old,
+ int flags)
{
- return secondary_ops->task_post_setuid(id0, id1, id2, flags);
+ return secondary_ops->task_fix_setuid(new, old, flags);
}
static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
@@ -3235,23 +3346,22 @@
static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
{
- return task_has_perm(current, p, PROCESS__SETPGID);
+ return current_has_perm(p, PROCESS__SETPGID);
}
static int selinux_task_getpgid(struct task_struct *p)
{
- return task_has_perm(current, p, PROCESS__GETPGID);
+ return current_has_perm(p, PROCESS__GETPGID);
}
static int selinux_task_getsid(struct task_struct *p)
{
- return task_has_perm(current, p, PROCESS__GETSESSION);
+ return current_has_perm(p, PROCESS__GETSESSION);
}
static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
{
- struct task_security_struct *tsec = p->security;
- *secid = tsec->sid;
+ *secid = task_sid(p);
}
static int selinux_task_setgroups(struct group_info *group_info)
@@ -3268,7 +3378,7 @@
if (rc)
return rc;
- return task_has_perm(current, p, PROCESS__SETSCHED);
+ return current_has_perm(p, PROCESS__SETSCHED);
}
static int selinux_task_setioprio(struct task_struct *p, int ioprio)
@@ -3279,12 +3389,12 @@
if (rc)
return rc;
- return task_has_perm(current, p, PROCESS__SETSCHED);
+ return current_has_perm(p, PROCESS__SETSCHED);
}
static int selinux_task_getioprio(struct task_struct *p)
{
- return task_has_perm(current, p, PROCESS__GETSCHED);
+ return current_has_perm(p, PROCESS__GETSCHED);
}
static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
@@ -3299,9 +3409,9 @@
/* Control the ability to change the hard limit (whether
lowering or raising it), so that the hard limit can
later be used as a safe reset point for the soft limit
- upon context transitions. See selinux_bprm_apply_creds. */
+ upon context transitions. See selinux_bprm_committing_creds. */
if (old_rlim->rlim_max != new_rlim->rlim_max)
- return task_has_perm(current, current, PROCESS__SETRLIMIT);
+ return current_has_perm(current, PROCESS__SETRLIMIT);
return 0;
}
@@ -3314,17 +3424,17 @@
if (rc)
return rc;
- return task_has_perm(current, p, PROCESS__SETSCHED);
+ return current_has_perm(p, PROCESS__SETSCHED);
}
static int selinux_task_getscheduler(struct task_struct *p)
{
- return task_has_perm(current, p, PROCESS__GETSCHED);
+ return current_has_perm(p, PROCESS__GETSCHED);
}
static int selinux_task_movememory(struct task_struct *p)
{
- return task_has_perm(current, p, PROCESS__SETSCHED);
+ return current_has_perm(p, PROCESS__SETSCHED);
}
static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
@@ -3332,7 +3442,6 @@
{
u32 perm;
int rc;
- struct task_security_struct *tsec;
rc = secondary_ops->task_kill(p, info, sig, secid);
if (rc)
@@ -3342,11 +3451,11 @@
perm = PROCESS__SIGNULL; /* null signal; existence test */
else
perm = signal_to_av(sig);
- tsec = p->security;
if (secid)
- rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL);
+ rc = avc_has_perm(secid, task_sid(p),
+ SECCLASS_PROCESS, perm, NULL);
else
- rc = task_has_perm(current, p, perm);
+ rc = current_has_perm(p, perm);
return rc;
}
@@ -3354,13 +3463,12 @@
unsigned long arg2,
unsigned long arg3,
unsigned long arg4,
- unsigned long arg5,
- long *rc_p)
+ unsigned long arg5)
{
/* The current prctl operations do not appear to require
any SELinux controls since they merely observe or modify
the state of the current process. */
- return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5, rc_p);
+ return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5);
}
static int selinux_task_wait(struct task_struct *p)
@@ -3368,27 +3476,14 @@
return task_has_perm(p, current, PROCESS__SIGCHLD);
}
-static void selinux_task_reparent_to_init(struct task_struct *p)
-{
- struct task_security_struct *tsec;
-
- secondary_ops->task_reparent_to_init(p);
-
- tsec = p->security;
- tsec->osid = tsec->sid;
- tsec->sid = SECINITSID_KERNEL;
- return;
-}
-
static void selinux_task_to_inode(struct task_struct *p,
struct inode *inode)
{
- struct task_security_struct *tsec = p->security;
struct inode_security_struct *isec = inode->i_security;
+ u32 sid = task_sid(p);
- isec->sid = tsec->sid;
+ isec->sid = sid;
isec->initialized = 1;
- return;
}
/* Returns error only if unable to parse addresses */
@@ -3627,19 +3722,19 @@
u32 perms)
{
struct inode_security_struct *isec;
- struct task_security_struct *tsec;
struct avc_audit_data ad;
+ u32 sid;
int err = 0;
- tsec = task->security;
isec = SOCK_INODE(sock)->i_security;
if (isec->sid == SECINITSID_KERNEL)
goto out;
+ sid = task_sid(task);
AVC_AUDIT_DATA_INIT(&ad, NET);
ad.u.net.sk = sock->sk;
- err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
+ err = avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
out:
return err;
@@ -3648,18 +3743,20 @@
static int selinux_socket_create(int family, int type,
int protocol, int kern)
{
+ const struct cred *cred = current_cred();
+ const struct task_security_struct *tsec = cred->security;
+ u32 sid, newsid;
+ u16 secclass;
int err = 0;
- struct task_security_struct *tsec;
- u32 newsid;
if (kern)
goto out;
- tsec = current->security;
- newsid = tsec->sockcreate_sid ? : tsec->sid;
- err = avc_has_perm(tsec->sid, newsid,
- socket_type_to_security_class(family, type,
- protocol), SOCKET__CREATE, NULL);
+ sid = tsec->sid;
+ newsid = tsec->sockcreate_sid ?: sid;
+
+ secclass = socket_type_to_security_class(family, type, protocol);
+ err = avc_has_perm(sid, newsid, secclass, SOCKET__CREATE, NULL);
out:
return err;
@@ -3668,18 +3765,26 @@
static int selinux_socket_post_create(struct socket *sock, int family,
int type, int protocol, int kern)
{
- int err = 0;
+ const struct cred *cred = current_cred();
+ const struct task_security_struct *tsec = cred->security;
struct inode_security_struct *isec;
- struct task_security_struct *tsec;
struct sk_security_struct *sksec;
- u32 newsid;
+ u32 sid, newsid;
+ int err = 0;
+
+ sid = tsec->sid;
+ newsid = tsec->sockcreate_sid;
isec = SOCK_INODE(sock)->i_security;
- tsec = current->security;
- newsid = tsec->sockcreate_sid ? : tsec->sid;
+ if (kern)
+ isec->sid = SECINITSID_KERNEL;
+ else if (newsid)
+ isec->sid = newsid;
+ else
+ isec->sid = sid;
+
isec->sclass = socket_type_to_security_class(family, type, protocol);
- isec->sid = kern ? SECINITSID_KERNEL : newsid;
isec->initialized = 1;
if (sock->sk) {
@@ -3714,7 +3819,6 @@
if (family == PF_INET || family == PF_INET6) {
char *addrp;
struct inode_security_struct *isec;
- struct task_security_struct *tsec;
struct avc_audit_data ad;
struct sockaddr_in *addr4 = NULL;
struct sockaddr_in6 *addr6 = NULL;
@@ -3722,7 +3826,6 @@
struct sock *sk = sock->sk;
u32 sid, node_perm;
- tsec = current->security;
isec = SOCK_INODE(sock)->i_security;
if (family == PF_INET) {
@@ -4387,7 +4490,7 @@
"SELinux: unrecognized netlink message"
" type=%hu for sclass=%hu\n",
nlh->nlmsg_type, isec->sclass);
- if (!selinux_enforcing)
+ if (!selinux_enforcing || security_get_allow_unknown())
err = 0;
}
@@ -4763,15 +4866,16 @@
struct kern_ipc_perm *perm,
u16 sclass)
{
- struct task_security_struct *tsec = task->security;
struct ipc_security_struct *isec;
+ u32 sid;
isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
if (!isec)
return -ENOMEM;
+ sid = task_sid(task);
isec->sclass = sclass;
- isec->sid = tsec->sid;
+ isec->sid = sid;
perm->security = isec;
return 0;
@@ -4809,17 +4913,16 @@
static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
u32 perms)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
- tsec = current->security;
isec = ipc_perms->security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = ipc_perms->key;
- return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
+ return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
}
static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
@@ -4835,22 +4938,21 @@
/* message queue security operations */
static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
int rc;
rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
if (rc)
return rc;
- tsec = current->security;
isec = msq->q_perm.security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = msq->q_perm.key;
- rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
+ rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
MSGQ__CREATE, &ad);
if (rc) {
ipc_free_security(&msq->q_perm);
@@ -4866,17 +4968,16 @@
static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
- tsec = current->security;
isec = msq->q_perm.security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = msq->q_perm.key;
- return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
+ return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
MSGQ__ASSOCIATE, &ad);
}
@@ -4910,13 +5011,12 @@
static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct msg_security_struct *msec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
int rc;
- tsec = current->security;
isec = msq->q_perm.security;
msec = msg->security;
@@ -4928,9 +5028,7 @@
* Compute new sid based on current process and
* message queue this message will be stored in
*/
- rc = security_transition_sid(tsec->sid,
- isec->sid,
- SECCLASS_MSG,
+ rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
&msec->sid);
if (rc)
return rc;
@@ -4940,16 +5038,16 @@
ad.u.ipc_id = msq->q_perm.key;
/* Can this process write to the queue? */
- rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
+ rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
MSGQ__WRITE, &ad);
if (!rc)
/* Can this process send the message */
- rc = avc_has_perm(tsec->sid, msec->sid,
- SECCLASS_MSG, MSG__SEND, &ad);
+ rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG,
+ MSG__SEND, &ad);
if (!rc)
/* Can the message be put in the queue? */
- rc = avc_has_perm(msec->sid, isec->sid,
- SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);
+ rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ,
+ MSGQ__ENQUEUE, &ad);
return rc;
}
@@ -4958,23 +5056,22 @@
struct task_struct *target,
long type, int mode)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct msg_security_struct *msec;
struct avc_audit_data ad;
+ u32 sid = task_sid(target);
int rc;
- tsec = target->security;
isec = msq->q_perm.security;
msec = msg->security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = msq->q_perm.key;
- rc = avc_has_perm(tsec->sid, isec->sid,
+ rc = avc_has_perm(sid, isec->sid,
SECCLASS_MSGQ, MSGQ__READ, &ad);
if (!rc)
- rc = avc_has_perm(tsec->sid, msec->sid,
+ rc = avc_has_perm(sid, msec->sid,
SECCLASS_MSG, MSG__RECEIVE, &ad);
return rc;
}
@@ -4982,22 +5079,21 @@
/* Shared Memory security operations */
static int selinux_shm_alloc_security(struct shmid_kernel *shp)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
int rc;
rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
if (rc)
return rc;
- tsec = current->security;
isec = shp->shm_perm.security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = shp->shm_perm.key;
- rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
+ rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM,
SHM__CREATE, &ad);
if (rc) {
ipc_free_security(&shp->shm_perm);
@@ -5013,17 +5109,16 @@
static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
- tsec = current->security;
isec = shp->shm_perm.security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = shp->shm_perm.key;
- return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
+ return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
SHM__ASSOCIATE, &ad);
}
@@ -5081,22 +5176,21 @@
/* Semaphore security operations */
static int selinux_sem_alloc_security(struct sem_array *sma)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
int rc;
rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
if (rc)
return rc;
- tsec = current->security;
isec = sma->sem_perm.security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = sma->sem_perm.key;
- rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
+ rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM,
SEM__CREATE, &ad);
if (rc) {
ipc_free_security(&sma->sem_perm);
@@ -5112,17 +5206,16 @@
static int selinux_sem_associate(struct sem_array *sma, int semflg)
{
- struct task_security_struct *tsec;
struct ipc_security_struct *isec;
struct avc_audit_data ad;
+ u32 sid = current_sid();
- tsec = current->security;
isec = sma->sem_perm.security;
AVC_AUDIT_DATA_INIT(&ad, IPC);
ad.u.ipc_id = sma->sem_perm.key;
- return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
+ return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
SEM__ASSOCIATE, &ad);
}
@@ -5212,33 +5305,35 @@
static int selinux_getprocattr(struct task_struct *p,
char *name, char **value)
{
- struct task_security_struct *tsec;
+ const struct task_security_struct *__tsec;
u32 sid;
int error;
unsigned len;
if (current != p) {
- error = task_has_perm(current, p, PROCESS__GETATTR);
+ error = current_has_perm(p, PROCESS__GETATTR);
if (error)
return error;
}
- tsec = p->security;
+ rcu_read_lock();
+ __tsec = __task_cred(p)->security;
if (!strcmp(name, "current"))
- sid = tsec->sid;
+ sid = __tsec->sid;
else if (!strcmp(name, "prev"))
- sid = tsec->osid;
+ sid = __tsec->osid;
else if (!strcmp(name, "exec"))
- sid = tsec->exec_sid;
+ sid = __tsec->exec_sid;
else if (!strcmp(name, "fscreate"))
- sid = tsec->create_sid;
+ sid = __tsec->create_sid;
else if (!strcmp(name, "keycreate"))
- sid = tsec->keycreate_sid;
+ sid = __tsec->keycreate_sid;
else if (!strcmp(name, "sockcreate"))
- sid = tsec->sockcreate_sid;
+ sid = __tsec->sockcreate_sid;
else
- return -EINVAL;
+ goto invalid;
+ rcu_read_unlock();
if (!sid)
return 0;
@@ -5247,6 +5342,10 @@
if (error)
return error;
return len;
+
+invalid:
+ rcu_read_unlock();
+ return -EINVAL;
}
static int selinux_setprocattr(struct task_struct *p,
@@ -5254,7 +5353,8 @@
{
struct task_security_struct *tsec;
struct task_struct *tracer;
- u32 sid = 0;
+ struct cred *new;
+ u32 sid = 0, ptsid;
int error;
char *str = value;
@@ -5270,15 +5370,15 @@
* above restriction is ever removed.
*/
if (!strcmp(name, "exec"))
- error = task_has_perm(current, p, PROCESS__SETEXEC);
+ error = current_has_perm(p, PROCESS__SETEXEC);
else if (!strcmp(name, "fscreate"))
- error = task_has_perm(current, p, PROCESS__SETFSCREATE);
+ error = current_has_perm(p, PROCESS__SETFSCREATE);
else if (!strcmp(name, "keycreate"))
- error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
+ error = current_has_perm(p, PROCESS__SETKEYCREATE);
else if (!strcmp(name, "sockcreate"))
- error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
+ error = current_has_perm(p, PROCESS__SETSOCKCREATE);
else if (!strcmp(name, "current"))
- error = task_has_perm(current, p, PROCESS__SETCURRENT);
+ error = current_has_perm(p, PROCESS__SETCURRENT);
else
error = -EINVAL;
if (error)
@@ -5301,87 +5401,75 @@
return error;
}
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
/* Permission checking based on the specified context is
performed during the actual operation (execve,
open/mkdir/...), when we know the full context of the
- operation. See selinux_bprm_set_security for the execve
+ operation. See selinux_bprm_set_creds for the execve
checks and may_create for the file creation checks. The
operation will then fail if the context is not permitted. */
- tsec = p->security;
- if (!strcmp(name, "exec"))
+ tsec = new->security;
+ if (!strcmp(name, "exec")) {
tsec->exec_sid = sid;
- else if (!strcmp(name, "fscreate"))
+ } else if (!strcmp(name, "fscreate")) {
tsec->create_sid = sid;
- else if (!strcmp(name, "keycreate")) {
+ } else if (!strcmp(name, "keycreate")) {
error = may_create_key(sid, p);
if (error)
- return error;
+ goto abort_change;
tsec->keycreate_sid = sid;
- } else if (!strcmp(name, "sockcreate"))
+ } else if (!strcmp(name, "sockcreate")) {
tsec->sockcreate_sid = sid;
- else if (!strcmp(name, "current")) {
- struct av_decision avd;
-
+ } else if (!strcmp(name, "current")) {
+ error = -EINVAL;
if (sid == 0)
- return -EINVAL;
- /*
- * SELinux allows to change context in the following case only.
- * - Single threaded processes.
- * - Multi threaded processes intend to change its context into
- * more restricted domain (defined by TYPEBOUNDS statement).
- */
- if (atomic_read(&p->mm->mm_users) != 1) {
- struct task_struct *g, *t;
- struct mm_struct *mm = p->mm;
- read_lock(&tasklist_lock);
- do_each_thread(g, t) {
- if (t->mm == mm && t != p) {
- read_unlock(&tasklist_lock);
- error = security_bounded_transition(tsec->sid, sid);
- if (!error)
- goto boundary_ok;
+ goto abort_change;
- return error;
- }
- } while_each_thread(g, t);
- read_unlock(&tasklist_lock);
+ /* Only allow single threaded processes to change context */
+ error = -EPERM;
+ if (!is_single_threaded(p)) {
+ error = security_bounded_transition(tsec->sid, sid);
+ if (error)
+ goto abort_change;
}
-boundary_ok:
/* Check permissions for the transition. */
error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
PROCESS__DYNTRANSITION, NULL);
if (error)
- return error;
+ goto abort_change;
/* Check for ptracing, and update the task SID if ok.
Otherwise, leave SID unchanged and fail. */
+ ptsid = 0;
task_lock(p);
- rcu_read_lock();
tracer = tracehook_tracer_task(p);
- if (tracer != NULL) {
- struct task_security_struct *ptsec = tracer->security;
- u32 ptsid = ptsec->sid;
- rcu_read_unlock();
- error = avc_has_perm_noaudit(ptsid, sid,
- SECCLASS_PROCESS,
- PROCESS__PTRACE, 0, &avd);
- if (!error)
- tsec->sid = sid;
- task_unlock(p);
- avc_audit(ptsid, sid, SECCLASS_PROCESS,
- PROCESS__PTRACE, &avd, error, NULL);
- if (error)
- return error;
- } else {
- rcu_read_unlock();
- tsec->sid = sid;
- task_unlock(p);
- }
- } else
- return -EINVAL;
+ if (tracer)
+ ptsid = task_sid(tracer);
+ task_unlock(p);
+ if (tracer) {
+ error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
+ PROCESS__PTRACE, NULL);
+ if (error)
+ goto abort_change;
+ }
+
+ tsec->sid = sid;
+ } else {
+ error = -EINVAL;
+ goto abort_change;
+ }
+
+ commit_creds(new);
return size;
+
+abort_change:
+ abort_creds(new);
+ return error;
}
static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
@@ -5401,22 +5489,23 @@
#ifdef CONFIG_KEYS
-static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
+static int selinux_key_alloc(struct key *k, const struct cred *cred,
unsigned long flags)
{
- struct task_security_struct *tsec = tsk->security;
+ const struct task_security_struct *tsec;
struct key_security_struct *ksec;
ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
if (!ksec)
return -ENOMEM;
+ tsec = cred->security;
if (tsec->keycreate_sid)
ksec->sid = tsec->keycreate_sid;
else
ksec->sid = tsec->sid;
- k->security = ksec;
+ k->security = ksec;
return 0;
}
@@ -5429,17 +5518,12 @@
}
static int selinux_key_permission(key_ref_t key_ref,
- struct task_struct *ctx,
- key_perm_t perm)
+ const struct cred *cred,
+ key_perm_t perm)
{
struct key *key;
- struct task_security_struct *tsec;
struct key_security_struct *ksec;
-
- key = key_ref_to_ptr(key_ref);
-
- tsec = ctx->security;
- ksec = key->security;
+ u32 sid;
/* if no specific permissions are requested, we skip the
permission check. No serious, additional covert channels
@@ -5447,8 +5531,12 @@
if (perm == 0)
return 0;
- return avc_has_perm(tsec->sid, ksec->sid,
- SECCLASS_KEY, perm, NULL);
+ sid = cred_sid(cred);
+
+ key = key_ref_to_ptr(key_ref);
+ ksec = key->security;
+
+ return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL);
}
static int selinux_key_getsecurity(struct key *key, char **_buffer)
@@ -5473,8 +5561,7 @@
.ptrace_may_access = selinux_ptrace_may_access,
.ptrace_traceme = selinux_ptrace_traceme,
.capget = selinux_capget,
- .capset_check = selinux_capset_check,
- .capset_set = selinux_capset_set,
+ .capset = selinux_capset,
.sysctl = selinux_sysctl,
.capable = selinux_capable,
.quotactl = selinux_quotactl,
@@ -5485,12 +5572,10 @@
.netlink_send = selinux_netlink_send,
.netlink_recv = selinux_netlink_recv,
- .bprm_alloc_security = selinux_bprm_alloc_security,
- .bprm_free_security = selinux_bprm_free_security,
- .bprm_apply_creds = selinux_bprm_apply_creds,
- .bprm_post_apply_creds = selinux_bprm_post_apply_creds,
- .bprm_set_security = selinux_bprm_set_security,
+ .bprm_set_creds = selinux_bprm_set_creds,
.bprm_check_security = selinux_bprm_check_security,
+ .bprm_committing_creds = selinux_bprm_committing_creds,
+ .bprm_committed_creds = selinux_bprm_committed_creds,
.bprm_secureexec = selinux_bprm_secureexec,
.sb_alloc_security = selinux_sb_alloc_security,
@@ -5549,10 +5634,13 @@
.dentry_open = selinux_dentry_open,
.task_create = selinux_task_create,
- .task_alloc_security = selinux_task_alloc_security,
- .task_free_security = selinux_task_free_security,
+ .cred_free = selinux_cred_free,
+ .cred_prepare = selinux_cred_prepare,
+ .cred_commit = selinux_cred_commit,
+ .kernel_act_as = selinux_kernel_act_as,
+ .kernel_create_files_as = selinux_kernel_create_files_as,
.task_setuid = selinux_task_setuid,
- .task_post_setuid = selinux_task_post_setuid,
+ .task_fix_setuid = selinux_task_fix_setuid,
.task_setgid = selinux_task_setgid,
.task_setpgid = selinux_task_setpgid,
.task_getpgid = selinux_task_getpgid,
@@ -5569,7 +5657,6 @@
.task_kill = selinux_task_kill,
.task_wait = selinux_task_wait,
.task_prctl = selinux_task_prctl,
- .task_reparent_to_init = selinux_task_reparent_to_init,
.task_to_inode = selinux_task_to_inode,
.ipc_permission = selinux_ipc_permission,
@@ -5665,8 +5752,6 @@
static __init int selinux_init(void)
{
- struct task_security_struct *tsec;
-
if (!security_module_enable(&selinux_ops)) {
selinux_enabled = 0;
return 0;
@@ -5680,10 +5765,7 @@
printk(KERN_INFO "SELinux: Initializing.\n");
/* Set the security state for the initial task. */
- if (task_alloc_security(current))
- panic("SELinux: Failed to initialize initial task.\n");
- tsec = current->security;
- tsec->osid = tsec->sid = SECINITSID_KERNEL;
+ cred_init_security();
sel_inode_cache = kmem_cache_create("selinux_inode_security",
sizeof(struct inode_security_struct),
diff --git a/security/selinux/include/av_perm_to_string.h b/security/selinux/include/av_perm_to_string.h
index 1223b4f..c0c8854 100644
--- a/security/selinux/include/av_perm_to_string.h
+++ b/security/selinux/include/av_perm_to_string.h
@@ -176,3 +176,5 @@
S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NAME_CONNECT, "name_connect")
S_(SECCLASS_MEMPROTECT, MEMPROTECT__MMAP_ZERO, "mmap_zero")
S_(SECCLASS_PEER, PEER__RECV, "recv")
+ S_(SECCLASS_KERNEL_SERVICE, KERNEL_SERVICE__USE_AS_OVERRIDE, "use_as_override")
+ S_(SECCLASS_KERNEL_SERVICE, KERNEL_SERVICE__CREATE_FILES_AS, "create_files_as")
diff --git a/security/selinux/include/av_permissions.h b/security/selinux/include/av_permissions.h
index c4c5116..0ba79fe 100644
--- a/security/selinux/include/av_permissions.h
+++ b/security/selinux/include/av_permissions.h
@@ -841,3 +841,5 @@
#define DCCP_SOCKET__NAME_CONNECT 0x00800000UL
#define MEMPROTECT__MMAP_ZERO 0x00000001UL
#define PEER__RECV 0x00000001UL
+#define KERNEL_SERVICE__USE_AS_OVERRIDE 0x00000001UL
+#define KERNEL_SERVICE__CREATE_FILES_AS 0x00000002UL
diff --git a/security/selinux/include/class_to_string.h b/security/selinux/include/class_to_string.h
index bd813c3..21ec786 100644
--- a/security/selinux/include/class_to_string.h
+++ b/security/selinux/include/class_to_string.h
@@ -72,3 +72,8 @@
S_(NULL)
S_("peer")
S_("capability2")
+ S_(NULL)
+ S_(NULL)
+ S_(NULL)
+ S_(NULL)
+ S_("kernel_service")
diff --git a/security/selinux/include/flask.h b/security/selinux/include/flask.h
index febf886..882f27d 100644
--- a/security/selinux/include/flask.h
+++ b/security/selinux/include/flask.h
@@ -52,6 +52,7 @@
#define SECCLASS_MEMPROTECT 61
#define SECCLASS_PEER 68
#define SECCLASS_CAPABILITY2 69
+#define SECCLASS_KERNEL_SERVICE 74
/*
* Security identifier indices for initial entities
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index f8be8d7..3cc4516 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -77,17 +77,6 @@
u32 sid; /* SID of IPC resource */
};
-struct bprm_security_struct {
- u32 sid; /* SID for transformed process */
- unsigned char set;
-
- /*
- * unsafe is used to share failure information from bprm_apply_creds()
- * to bprm_post_apply_creds().
- */
- char unsafe;
-};
-
struct netif_security_struct {
int ifindex; /* device index */
u32 sid; /* SID for this interface */
diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c
index ff59c0c..4ed7bab 100644
--- a/security/selinux/nlmsgtab.c
+++ b/security/selinux/nlmsgtab.c
@@ -63,6 +63,9 @@
{ RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+ { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+ { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+ { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
};
static struct nlmsg_perm nlmsg_firewall_perms[] =
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 69c9dcc..c863036 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -95,13 +95,18 @@
static int task_has_security(struct task_struct *tsk,
u32 perms)
{
- struct task_security_struct *tsec;
+ const struct task_security_struct *tsec;
+ u32 sid = 0;
- tsec = tsk->security;
+ rcu_read_lock();
+ tsec = __task_cred(tsk)->security;
+ if (tsec)
+ sid = tsec->sid;
+ rcu_read_unlock();
if (!tsec)
return -EACCES;
- return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
+ return avc_has_perm(sid, SECINITSID_SECURITY,
SECCLASS_SECURITY, perms, NULL);
}
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index 8f17f54..c0eb720 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -197,7 +197,7 @@
struct xfrm_user_sec_ctx *uctx, u32 sid)
{
int rc = 0;
- struct task_security_struct *tsec = current->security;
+ const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = NULL;
char *ctx_str = NULL;
u32 str_len;
@@ -333,7 +333,7 @@
*/
int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
{
- struct task_security_struct *tsec = current->security;
+ const struct task_security_struct *tsec = current_security();
int rc = 0;
if (ctx) {
@@ -378,7 +378,7 @@
*/
int selinux_xfrm_state_delete(struct xfrm_state *x)
{
- struct task_security_struct *tsec = current->security;
+ const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = x->security;
int rc = 0;
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 79ff21e..247cec3 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -164,7 +164,7 @@
{
int rc;
- rc = smk_access(current->security, obj_label, mode);
+ rc = smk_access(current_security(), obj_label, mode);
if (rc == 0)
return 0;
@@ -173,7 +173,7 @@
* only one that gets privilege and current does not
* have that label.
*/
- if (smack_onlycap != NULL && smack_onlycap != current->security)
+ if (smack_onlycap != NULL && smack_onlycap != current->cred->security)
return rc;
if (capable(CAP_MAC_OVERRIDE))
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 6e2dc0b..8ad4816 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -30,6 +30,8 @@
#include "smack.h"
+#define task_security(task) (task_cred_xxx((task), security))
+
/*
* I hope these are the hokeyist lines of code in the module. Casey.
*/
@@ -102,7 +104,7 @@
if (rc != 0)
return rc;
- rc = smk_access(current->security, ctp->security, MAY_READWRITE);
+ rc = smk_access(current_security(), task_security(ctp), MAY_READWRITE);
if (rc != 0 && capable(CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -124,7 +126,7 @@
if (rc != 0)
return rc;
- rc = smk_access(ptp->security, current->security, MAY_READWRITE);
+ rc = smk_access(task_security(ptp), current_security(), MAY_READWRITE);
if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -141,7 +143,7 @@
static int smack_syslog(int type)
{
int rc;
- char *sp = current->security;
+ char *sp = current_security();
rc = cap_syslog(type);
if (rc != 0)
@@ -373,7 +375,7 @@
*/
static int smack_inode_alloc_security(struct inode *inode)
{
- inode->i_security = new_inode_smack(current->security);
+ inode->i_security = new_inode_smack(current_security());
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
@@ -818,7 +820,7 @@
*/
static int smack_file_alloc_security(struct file *file)
{
- file->f_security = current->security;
+ file->f_security = current_security();
return 0;
}
@@ -916,7 +918,7 @@
*/
static int smack_file_set_fowner(struct file *file)
{
- file->f_security = current->security;
+ file->f_security = current_security();
return 0;
}
@@ -941,7 +943,7 @@
* struct fown_struct is never outside the context of a struct file
*/
file = container_of(fown, struct file, f_owner);
- rc = smk_access(file->f_security, tsk->security, MAY_WRITE);
+ rc = smk_access(file->f_security, tsk->cred->security, MAY_WRITE);
if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -973,33 +975,75 @@
*/
/**
- * smack_task_alloc_security - "allocate" a task blob
- * @tsk: the task in need of a blob
- *
- * Smack isn't using copies of blobs. Everyone
- * points to an immutable list. No alloc required.
- * No data copy required.
- *
- * Always returns 0
- */
-static int smack_task_alloc_security(struct task_struct *tsk)
-{
- tsk->security = current->security;
-
- return 0;
-}
-
-/**
- * smack_task_free_security - "free" a task blob
- * @task: the task with the blob
+ * smack_cred_free - "free" task-level security credentials
+ * @cred: the credentials in question
*
* Smack isn't using copies of blobs. Everyone
* points to an immutable list. The blobs never go away.
* There is no leak here.
*/
-static void smack_task_free_security(struct task_struct *task)
+static void smack_cred_free(struct cred *cred)
{
- task->security = NULL;
+ cred->security = NULL;
+}
+
+/**
+ * smack_cred_prepare - prepare new set of credentials for modification
+ * @new: the new credentials
+ * @old: the original credentials
+ * @gfp: the atomicity of any memory allocations
+ *
+ * Prepare a new set of credentials for modification.
+ */
+static int smack_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ new->security = old->security;
+ return 0;
+}
+
+/*
+ * commit new credentials
+ * @new: the new credentials
+ * @old: the original credentials
+ */
+static void smack_cred_commit(struct cred *new, const struct cred *old)
+{
+}
+
+/**
+ * smack_kernel_act_as - Set the subjective context in a set of credentials
+ * @new points to the set of credentials to be modified.
+ * @secid specifies the security ID to be set
+ *
+ * Set the security data for a kernel service.
+ */
+static int smack_kernel_act_as(struct cred *new, u32 secid)
+{
+ char *smack = smack_from_secid(secid);
+
+ if (smack == NULL)
+ return -EINVAL;
+
+ new->security = smack;
+ return 0;
+}
+
+/**
+ * smack_kernel_create_files_as - Set the file creation label in a set of creds
+ * @new points to the set of credentials to be modified
+ * @inode points to the inode to use as a reference
+ *
+ * Set the file creation context in a set of credentials to the same
+ * as the objective context of the specified inode
+ */
+static int smack_kernel_create_files_as(struct cred *new,
+ struct inode *inode)
+{
+ struct inode_smack *isp = inode->i_security;
+
+ new->security = isp->smk_inode;
+ return 0;
}
/**
@@ -1011,7 +1055,7 @@
*/
static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
{
- return smk_curacc(p->security, MAY_WRITE);
+ return smk_curacc(task_security(p), MAY_WRITE);
}
/**
@@ -1022,7 +1066,7 @@
*/
static int smack_task_getpgid(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1033,7 +1077,7 @@
*/
static int smack_task_getsid(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1045,7 +1089,7 @@
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
- *secid = smack_to_secid(p->security);
+ *secid = smack_to_secid(task_security(p));
}
/**
@@ -1061,7 +1105,7 @@
rc = cap_task_setnice(p, nice);
if (rc == 0)
- rc = smk_curacc(p->security, MAY_WRITE);
+ rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@@ -1078,7 +1122,7 @@
rc = cap_task_setioprio(p, ioprio);
if (rc == 0)
- rc = smk_curacc(p->security, MAY_WRITE);
+ rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@@ -1090,7 +1134,7 @@
*/
static int smack_task_getioprio(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1108,7 +1152,7 @@
rc = cap_task_setscheduler(p, policy, lp);
if (rc == 0)
- rc = smk_curacc(p->security, MAY_WRITE);
+ rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@@ -1120,7 +1164,7 @@
*/
static int smack_task_getscheduler(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1131,7 +1175,7 @@
*/
static int smack_task_movememory(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_WRITE);
+ return smk_curacc(task_security(p), MAY_WRITE);
}
/**
@@ -1154,13 +1198,13 @@
* can write the receiver.
*/
if (secid == 0)
- return smk_curacc(p->security, MAY_WRITE);
+ return smk_curacc(task_security(p), MAY_WRITE);
/*
* If the secid isn't 0 we're dealing with some USB IO
* specific behavior. This is not clean. For one thing
* we can't take privilege into account.
*/
- return smk_access(smack_from_secid(secid), p->security, MAY_WRITE);
+ return smk_access(smack_from_secid(secid), task_security(p), MAY_WRITE);
}
/**
@@ -1173,7 +1217,7 @@
{
int rc;
- rc = smk_access(current->security, p->security, MAY_WRITE);
+ rc = smk_access(current_security(), task_security(p), MAY_WRITE);
if (rc == 0)
return 0;
@@ -1204,7 +1248,7 @@
static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
- isp->smk_inode = p->security;
+ isp->smk_inode = task_security(p);
}
/*
@@ -1223,7 +1267,7 @@
*/
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
{
- char *csp = current->security;
+ char *csp = current_security();
struct socket_smack *ssp;
ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
@@ -1448,7 +1492,7 @@
*/
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
- msg->security = current->security;
+ msg->security = current_security();
return 0;
}
@@ -1484,7 +1528,7 @@
{
struct kern_ipc_perm *isp = &shp->shm_perm;
- isp->security = current->security;
+ isp->security = current_security();
return 0;
}
@@ -1593,7 +1637,7 @@
{
struct kern_ipc_perm *isp = &sma->sem_perm;
- isp->security = current->security;
+ isp->security = current_security();
return 0;
}
@@ -1697,7 +1741,7 @@
{
struct kern_ipc_perm *kisp = &msq->q_perm;
- kisp->security = current->security;
+ kisp->security = current_security();
return 0;
}
@@ -1852,7 +1896,7 @@
struct super_block *sbp;
struct superblock_smack *sbsp;
struct inode_smack *isp;
- char *csp = current->security;
+ char *csp = current_security();
char *fetched;
char *final;
struct dentry *dp;
@@ -2009,7 +2053,7 @@
if (strcmp(name, "current") != 0)
return -EINVAL;
- cp = kstrdup(p->security, GFP_KERNEL);
+ cp = kstrdup(task_security(p), GFP_KERNEL);
if (cp == NULL)
return -ENOMEM;
@@ -2033,6 +2077,7 @@
static int smack_setprocattr(struct task_struct *p, char *name,
void *value, size_t size)
{
+ struct cred *new;
char *newsmack;
/*
@@ -2055,7 +2100,11 @@
if (newsmack == NULL)
return -EINVAL;
- p->security = newsmack;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ new->security = newsmack;
+ commit_creds(new);
return size;
}
@@ -2288,8 +2337,7 @@
return;
ssp = sk->sk_security;
- ssp->smk_in = current->security;
- ssp->smk_out = current->security;
+ ssp->smk_in = ssp->smk_out = current_security();
ssp->smk_packet[0] = '\0';
rc = smack_netlabel(sk);
@@ -2352,17 +2400,17 @@
/**
* smack_key_alloc - Set the key security blob
* @key: object
- * @tsk: the task associated with the key
+ * @cred: the credentials to use
* @flags: unused
*
* No allocation required
*
* Returns 0
*/
-static int smack_key_alloc(struct key *key, struct task_struct *tsk,
+static int smack_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
- key->security = tsk->security;
+ key->security = cred->security;
return 0;
}
@@ -2380,14 +2428,14 @@
/*
* smack_key_permission - Smack access on a key
* @key_ref: gets to the object
- * @context: task involved
+ * @cred: the credentials to use
* @perm: unused
*
* Return 0 if the task has read and write to the object,
* an error code otherwise
*/
static int smack_key_permission(key_ref_t key_ref,
- struct task_struct *context, key_perm_t perm)
+ const struct cred *cred, key_perm_t perm)
{
struct key *keyp;
@@ -2403,10 +2451,10 @@
/*
* This should not occur
*/
- if (context->security == NULL)
+ if (cred->security == NULL)
return -EACCES;
- return smk_access(context->security, keyp->security, MAY_READWRITE);
+ return smk_access(cred->security, keyp->security, MAY_READWRITE);
}
#endif /* CONFIG_KEYS */
@@ -2577,15 +2625,13 @@
.ptrace_may_access = smack_ptrace_may_access,
.ptrace_traceme = smack_ptrace_traceme,
.capget = cap_capget,
- .capset_check = cap_capset_check,
- .capset_set = cap_capset_set,
+ .capset = cap_capset,
.capable = cap_capable,
.syslog = smack_syslog,
.settime = cap_settime,
.vm_enough_memory = cap_vm_enough_memory,
- .bprm_apply_creds = cap_bprm_apply_creds,
- .bprm_set_security = cap_bprm_set_security,
+ .bprm_set_creds = cap_bprm_set_creds,
.bprm_secureexec = cap_bprm_secureexec,
.sb_alloc_security = smack_sb_alloc_security,
@@ -2627,9 +2673,12 @@
.file_send_sigiotask = smack_file_send_sigiotask,
.file_receive = smack_file_receive,
- .task_alloc_security = smack_task_alloc_security,
- .task_free_security = smack_task_free_security,
- .task_post_setuid = cap_task_post_setuid,
+ .cred_free = smack_cred_free,
+ .cred_prepare = smack_cred_prepare,
+ .cred_commit = smack_cred_commit,
+ .kernel_act_as = smack_kernel_act_as,
+ .kernel_create_files_as = smack_kernel_create_files_as,
+ .task_fix_setuid = cap_task_fix_setuid,
.task_setpgid = smack_task_setpgid,
.task_getpgid = smack_task_getpgid,
.task_getsid = smack_task_getsid,
@@ -2642,7 +2691,6 @@
.task_movememory = smack_task_movememory,
.task_kill = smack_task_kill,
.task_wait = smack_task_wait,
- .task_reparent_to_init = cap_task_reparent_to_init,
.task_to_inode = smack_task_to_inode,
.task_prctl = cap_task_prctl,
@@ -2718,6 +2766,8 @@
*/
static __init int smack_init(void)
{
+ struct cred *cred;
+
if (!security_module_enable(&smack_ops))
return 0;
@@ -2726,7 +2776,8 @@
/*
* Set the security state for the initial task.
*/
- current->security = &smack_known_floor.smk_known;
+ cred = (struct cred *) current->cred;
+ cred->security = &smack_known_floor.smk_known;
/*
* Initialize locks
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index c21d8c8..ca257df 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -336,7 +336,7 @@
audit_info.loginuid = audit_get_loginuid(current);
audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current->security);
+ audit_info.secid = smack_to_secid(current_security());
rc = netlbl_cfg_map_del(NULL, &audit_info);
if (rc != 0)
@@ -371,7 +371,7 @@
audit_info.loginuid = audit_get_loginuid(current);
audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current->security);
+ audit_info.secid = smack_to_secid(current_security());
if (oldambient != NULL) {
rc = netlbl_cfg_map_del(oldambient, &audit_info);
@@ -843,7 +843,7 @@
size_t count, loff_t *ppos)
{
char in[SMK_LABELLEN];
- char *sp = current->security;
+ char *sp = current->cred->security;
if (!capable(CAP_MAC_ADMIN))
return -EPERM;