audit: anchor all pid references in the initial pid namespace
Store and log all PIDs with reference to the initial PID namespace and
use the access functions task_pid_nr() and task_tgid_nr() for task->pid
and task->tgid.
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
(informed by ebiederman's c776b5d2)
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
index b0e5401..90ca082 100644
--- a/drivers/tty/tty_audit.c
+++ b/drivers/tty/tty_audit.c
@@ -65,6 +65,7 @@
{
struct audit_buffer *ab;
struct task_struct *tsk = current;
+ pid_t pid = task_pid_nr(tsk);
uid_t uid = from_kuid(&init_user_ns, task_uid(tsk));
uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(tsk));
unsigned int sessionid = audit_get_sessionid(tsk);
@@ -74,7 +75,7 @@
char name[sizeof(tsk->comm)];
audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d"
- " minor=%d comm=", description, tsk->pid, uid,
+ " minor=%d comm=", description, pid, uid,
loginuid, sessionid, major, minor);
get_task_comm(name, tsk);
audit_log_untrustedstring(ab, name);
diff --git a/kernel/audit.c b/kernel/audit.c
index e1e1b21..5a096f8 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -649,6 +649,7 @@
{
int rc = 0;
uid_t uid = from_kuid(&init_user_ns, current_uid());
+ pid_t pid = task_tgid_nr(current);
if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
*ab = NULL;
@@ -658,7 +659,7 @@
*ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
if (unlikely(!*ab))
return rc;
- audit_log_format(*ab, "pid=%d uid=%u", task_tgid_vnr(current), uid);
+ audit_log_format(*ab, "pid=%d uid=%u", pid, uid);
audit_log_session_info(*ab);
audit_log_task_context(*ab);
@@ -1823,7 +1824,7 @@
" euid=%u suid=%u fsuid=%u"
" egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
task_ppid_nr(tsk),
- tsk->pid,
+ task_pid_nr(tsk),
from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
from_kuid(&init_user_ns, cred->uid),
from_kgid(&init_user_ns, cred->gid),
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 549bbb6..96c8a70 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -433,6 +433,19 @@
f->val = 0;
}
+ if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) {
+ struct pid *pid;
+ rcu_read_lock();
+ pid = find_vpid(f->val);
+ if (!pid) {
+ rcu_read_unlock();
+ err = -ESRCH;
+ goto exit_free;
+ }
+ f->val = pid_nr(pid);
+ rcu_read_unlock();
+ }
+
err = audit_field_valid(entry, f);
if (err)
goto exit_free;
@@ -1242,12 +1255,14 @@
for (i = 0; i < rule->field_count; i++) {
struct audit_field *f = &rule->fields[i];
+ pid_t pid;
int result = 0;
u32 sid;
switch (f->type) {
case AUDIT_PID:
- result = audit_comparator(task_pid_vnr(current), f->op, f->val);
+ pid = task_pid_nr(current);
+ result = audit_comparator(pid, f->op, f->val);
break;
case AUDIT_UID:
result = audit_uid_comparator(current_uid(), f->op, f->uid);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index a6cf7ab..6381f25 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -457,10 +457,12 @@
struct audit_field *f = &rule->fields[i];
struct audit_names *n;
int result = 0;
+ pid_t pid;
switch (f->type) {
case AUDIT_PID:
- result = audit_comparator(tsk->pid, f->op, f->val);
+ pid = task_pid_nr(tsk);
+ result = audit_comparator(pid, f->op, f->val);
break;
case AUDIT_PPID:
if (ctx) {
@@ -2051,7 +2053,7 @@
audit_log_format(ab, "pid=%d uid=%u"
" old-auid=%u new-auid=%u old-ses=%u new-ses=%u"
" res=%d",
- current->pid, uid,
+ task_pid_nr(current), uid,
oldloginuid, loginuid, oldsessionid, sessionid,
!rc);
audit_log_end(ab);
@@ -2275,7 +2277,7 @@
{
struct audit_context *context = current->audit_context;
- context->target_pid = t->pid;
+ context->target_pid = task_pid_nr(t);
context->target_auid = audit_get_loginuid(t);
context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
@@ -2300,7 +2302,7 @@
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
- audit_sig_pid = tsk->pid;
+ audit_sig_pid = task_pid_nr(tsk);
if (uid_valid(tsk->loginuid))
audit_sig_uid = tsk->loginuid;
else
@@ -2314,7 +2316,7 @@
/* optimize the common case by putting first signal recipient directly
* in audit_context */
if (!ctx->target_pid) {
- ctx->target_pid = t->tgid;
+ ctx->target_pid = task_tgid_nr(t);
ctx->target_auid = audit_get_loginuid(t);
ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
@@ -2335,7 +2337,7 @@
}
BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
- axp->target_pid[axp->pid_count] = t->tgid;
+ axp->target_pid[axp->pid_count] = task_tgid_nr(t);
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
@@ -2435,7 +2437,7 @@
from_kgid(&init_user_ns, gid),
sessionid);
audit_log_task_context(ab);
- audit_log_format(ab, " pid=%d comm=", current->pid);
+ audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
audit_log_untrustedstring(ab, current->comm);
if (mm) {
down_read(&mm->mmap_sem);
diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index d7efb30..85253b5 100644
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -39,7 +39,7 @@
ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
- current->pid,
+ task_pid_nr(current),
from_kuid(&init_user_ns, current_cred()->uid),
from_kuid(&init_user_ns, audit_get_loginuid(current)),
audit_get_sessionid(current));
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 9a62045..69fdf3b 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -220,7 +220,7 @@
*/
BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);
- audit_log_format(ab, " pid=%d comm=", tsk->pid);
+ audit_log_format(ab, " pid=%d comm=", task_pid_nr(tsk));
audit_log_untrustedstring(ab, tsk->comm);
switch (a->type) {
@@ -278,9 +278,12 @@
}
case LSM_AUDIT_DATA_TASK:
tsk = a->u.tsk;
- if (tsk && tsk->pid) {
- audit_log_format(ab, " pid=%d comm=", tsk->pid);
- audit_log_untrustedstring(ab, tsk->comm);
+ if (tsk) {
+ pid_t pid = task_pid_nr(tsk);
+ if (pid) {
+ audit_log_format(ab, " pid=%d comm=", pid);
+ audit_log_untrustedstring(ab, tsk->comm);
+ }
}
break;
case LSM_AUDIT_DATA_NET: