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audit: convert PPIDs to the inital PID namespace. 

sys_getppid() returns the parent pid of the current process in its own pid
namespace.  Since audit filters are based in the init pid namespace, a process
could avoid a filter or trigger an unintended one by being in an alternate pid
namespace or log meaningless information.

Switch to task_ppid_nr() for PPIDs to anchor all audit filters in the
init_pid_ns.

(informed by ebiederman's 6c621b7e)
Cc: stable@vger.kernel.org
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
This commit is contained in:
Richard Guy Briggs 2013-12-10 22:10:41 -05:00 committed by Eric Paris
parent ad36d28293
commit c92cdeb45e
2 changed files with 3 additions and 3 deletions
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4
kernel/audit.c
View File

@ -1819,10 +1819,10 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
spin_unlock_irq(&tsk->sighand->siglock);
audit_log_format(ab,
" ppid=%ld pid=%d auid=%u uid=%u gid=%u"
" ppid=%d pid=%d auid=%u uid=%u gid=%u"
" euid=%u suid=%u fsuid=%u"
" egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
sys_getppid(),
task_ppid_nr(tsk),
tsk->pid,
from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
from_kuid(&init_user_ns, cred->uid),

2
kernel/auditsc.c
View File

@ -465,7 +465,7 @@ static int audit_filter_rules(struct task_struct *tsk,
case AUDIT_PPID:
if (ctx) {
if (!ctx->ppid)
ctx->ppid = sys_getppid();
ctx->ppid = task_ppid_nr(tsk);
result = audit_comparator(ctx->ppid, f->op, f->val);
}
break;