TOMOYO: Remove alias keyword.
Some programs behave differently depending on argv[0] passed to execve().
TOMOYO has "alias" keyword in order to allow administrators to define different
domains if requested pathname passed to execve() is a symlink. But "alias"
keyword is incomplete because this keyword assumes that requested pathname and
argv[0] are identical. Thus, remove "alias" keyword (by this patch) and add
syntax for checking argv[0] (by future patches).
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 183fe65..0e6b1b5 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1177,8 +1177,6 @@
is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
return tomoyo_write_aggregator_policy(data, is_delete);
- if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
- return tomoyo_write_alias_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
return tomoyo_write_globally_readable_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
@@ -1334,16 +1332,6 @@
w[1] = ptr->filename->name;
}
break;
- case TOMOYO_ID_ALIAS:
- {
- struct tomoyo_alias_entry *ptr =
- container_of(acl, typeof(*ptr), head);
- w[0] = TOMOYO_KEYWORD_ALIAS;
- w[1] = ptr->original_name->name;
- w[2] = " ";
- w[3] = ptr->aliased_name->name;
- }
- break;
case TOMOYO_ID_AGGREGATOR:
{
struct tomoyo_aggregator_entry *ptr =
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index ec3ed48..12b0c5c 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -53,7 +53,6 @@
TOMOYO_ID_DOMAIN_INITIALIZER,
TOMOYO_ID_DOMAIN_KEEPER,
TOMOYO_ID_AGGREGATOR,
- TOMOYO_ID_ALIAS,
TOMOYO_ID_GLOBALLY_READABLE,
TOMOYO_ID_PATTERN,
TOMOYO_ID_NO_REWRITE,
@@ -72,7 +71,6 @@
/* Keywords for ACLs. */
#define TOMOYO_KEYWORD_AGGREGATOR "aggregator "
-#define TOMOYO_KEYWORD_ALIAS "alias "
#define TOMOYO_KEYWORD_ALLOW_MOUNT "allow_mount "
#define TOMOYO_KEYWORD_ALLOW_READ "allow_read "
#define TOMOYO_KEYWORD_DELETE "delete "
@@ -683,20 +681,6 @@
};
/*
- * tomoyo_alias_entry is a structure which is used for holding "alias" entries.
- * It has following fields.
- *
- * (1) "head" is "struct tomoyo_acl_head".
- * (2) "original_name" which is a dereferenced pathname.
- * (3) "aliased_name" which is a symlink's pathname.
- */
-struct tomoyo_alias_entry {
- struct tomoyo_acl_head head;
- const struct tomoyo_path_info *original_name;
- const struct tomoyo_path_info *aliased_name;
-};
-
-/*
* tomoyo_policy_manager_entry is a structure which is used for holding list of
* domainnames or programs which are permitted to modify configuration via
* /sys/kernel/security/tomoyo/ interface.
@@ -809,8 +793,6 @@
unsigned long flags, void *data_page);
/* Create "aggregator" entry in exception policy. */
int tomoyo_write_aggregator_policy(char *data, const bool is_delete);
-/* Create "alias" entry in exception policy. */
-int tomoyo_write_alias_policy(char *data, const bool is_delete);
/*
* Create "initialize_domain" and "no_initialize_domain" entry
* in exception policy.
@@ -868,16 +850,14 @@
char *tomoyo_encode(const char *str);
/*
- * Returns realpath(3) of the given pathname but ignores chroot'ed root.
- * These functions use kzalloc(), so the caller must call kfree()
- * if these functions didn't return NULL.
- */
-char *tomoyo_realpath(const char *pathname);
-/*
- * Same with tomoyo_realpath() except that it doesn't follow the final symlink.
+ * Returns realpath(3) of the given pathname except that
+ * ignores chroot'ed root and does not follow the final symlink.
*/
char *tomoyo_realpath_nofollow(const char *pathname);
-/* Same with tomoyo_realpath() except that the pathname is already solved. */
+/*
+ * Returns realpath(3) of the given pathname except that
+ * ignores chroot'ed root and the pathname is already solved.
+ */
char *tomoyo_realpath_from_path(struct path *path);
/* Get patterned pathname. */
const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename);
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 038071a..273e670 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -467,72 +467,6 @@
return tomoyo_update_aggregator_entry(data, cp, is_delete);
}
-static bool tomoyo_same_alias_entry(const struct tomoyo_acl_head *a,
- const struct tomoyo_acl_head *b)
-{
- const struct tomoyo_alias_entry *p1 = container_of(a, typeof(*p1),
- head);
- const struct tomoyo_alias_entry *p2 = container_of(b, typeof(*p2),
- head);
- return p1->original_name == p2->original_name &&
- p1->aliased_name == p2->aliased_name;
-}
-
-/**
- * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list.
- *
- * @original_name: The original program's real name.
- * @aliased_name: The symbolic program's symbolic link's name.
- * @is_delete: True if it is a delete request.
- *
- * Returns 0 on success, negative value otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-static int tomoyo_update_alias_entry(const char *original_name,
- const char *aliased_name,
- const bool is_delete)
-{
- struct tomoyo_alias_entry e = { };
- int error = is_delete ? -ENOENT : -ENOMEM;
-
- if (!tomoyo_correct_path(original_name) ||
- !tomoyo_correct_path(aliased_name))
- return -EINVAL;
- e.original_name = tomoyo_get_name(original_name);
- e.aliased_name = tomoyo_get_name(aliased_name);
- if (!e.original_name || !e.aliased_name ||
- e.original_name->is_patterned || e.aliased_name->is_patterned)
- goto out; /* No patterns allowed. */
- error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
- &tomoyo_policy_list[TOMOYO_ID_ALIAS],
- tomoyo_same_alias_entry);
- out:
- tomoyo_put_name(e.original_name);
- tomoyo_put_name(e.aliased_name);
- return error;
-}
-
-/**
- * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list.
- *
- * @data: String to parse.
- * @is_delete: True if it is a delete request.
- *
- * Returns 0 on success, negative value otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-int tomoyo_write_alias_policy(char *data, const bool is_delete)
-{
- char *cp = strchr(data, ' ');
-
- if (!cp)
- return -EINVAL;
- *cp++ = '\0';
- return tomoyo_update_alias_entry(data, cp, is_delete);
-}
-
/**
* tomoyo_find_or_assign_new_domain - Create a domain.
*
@@ -606,7 +540,6 @@
int retval = -ENOMEM;
bool need_kfree = false;
struct tomoyo_path_info rn = { }; /* real name */
- struct tomoyo_path_info sn = { }; /* symlink name */
struct tomoyo_path_info ln; /* last name */
ln.name = tomoyo_get_last_name(old_domain);
@@ -621,39 +554,14 @@
kfree(rn.name);
need_kfree = false;
}
- /* Get tomoyo_realpath of program. */
+ /* Get symlink's pathname of program. */
retval = -ENOENT;
- rn.name = tomoyo_realpath(original_name);
+ rn.name = tomoyo_realpath_nofollow(original_name);
if (!rn.name)
goto out;
tomoyo_fill_path_info(&rn);
need_kfree = true;
- /* Get tomoyo_realpath of symbolic link. */
- sn.name = tomoyo_realpath_nofollow(original_name);
- if (!sn.name)
- goto out;
- tomoyo_fill_path_info(&sn);
-
- /* Check 'alias' directive. */
- if (tomoyo_pathcmp(&rn, &sn)) {
- struct tomoyo_alias_entry *ptr;
- /* Is this program allowed to be called via symbolic links? */
- list_for_each_entry_rcu(ptr,
- &tomoyo_policy_list[TOMOYO_ID_ALIAS],
- head.list) {
- if (ptr->head.is_deleted ||
- tomoyo_pathcmp(&rn, ptr->original_name) ||
- tomoyo_pathcmp(&sn, ptr->aliased_name))
- continue;
- kfree(rn.name);
- need_kfree = false;
- /* This is OK because it is read only. */
- rn = *ptr->aliased_name;
- break;
- }
- }
-
/* Check 'aggregator' directive. */
{
struct tomoyo_aggregator_entry *ptr;
@@ -663,8 +571,7 @@
!tomoyo_path_matches_pattern(&rn,
ptr->original_name))
continue;
- if (need_kfree)
- kfree(rn.name);
+ kfree(rn.name);
need_kfree = false;
/* This is OK because it is read only. */
rn = *ptr->aggregated_name;
@@ -729,7 +636,6 @@
bprm->cred->security = domain;
if (need_kfree)
kfree(rn.name);
- kfree(sn.name);
kfree(tmp);
return retval;
}
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
index cf62a4e..4d4ba84 100644
--- a/security/tomoyo/gc.c
+++ b/security/tomoyo/gc.c
@@ -77,14 +77,6 @@
tomoyo_put_name(ptr->aggregated_name);
}
-static void tomoyo_del_alias(struct list_head *element)
-{
- struct tomoyo_alias_entry *ptr =
- container_of(element, typeof(*ptr), head.list);
- tomoyo_put_name(ptr->original_name);
- tomoyo_put_name(ptr->aliased_name);
-}
-
static void tomoyo_del_manager(struct list_head *element)
{
struct tomoyo_policy_manager_entry *ptr =
@@ -309,9 +301,6 @@
case TOMOYO_ID_AGGREGATOR:
tomoyo_del_aggregator(element);
break;
- case TOMOYO_ID_ALIAS:
- tomoyo_del_alias(element);
- break;
case TOMOYO_ID_GLOBALLY_READABLE:
tomoyo_del_allow_read(element);
break;
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 153fa23..ed8ccd6 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -162,25 +162,6 @@
}
/**
- * tomoyo_realpath - Get realpath of a pathname.
- *
- * @pathname: The pathname to solve.
- *
- * Returns the realpath of @pathname on success, NULL otherwise.
- */
-char *tomoyo_realpath(const char *pathname)
-{
- struct path path;
-
- if (pathname && kern_path(pathname, LOOKUP_FOLLOW, &path) == 0) {
- char *buf = tomoyo_realpath_from_path(&path);
- path_put(&path);
- return buf;
- }
- return NULL;
-}
-
-/**
* tomoyo_realpath_nofollow - Get realpath of a pathname.
*
* @pathname: The pathname to solve.