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| author | Oleg Nesterov <oleg@redhat.com> | 2009-04-06 16:16:02 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-06 14:57:23 -0700 |
| commit | 432870dab85a2f69dc417022646cb9a70acf7f94 (patch) | |
| tree | 4c9c08d7fb77744b1fd04615a76ab0a9105fad07 | |
| parent | 22ae77bc7ac115b9d518d5cbc13d39317079b2b0 (diff) | |
| download | kernel-crypto-432870dab85a2f69dc417022646cb9a70acf7f94.tar.gz kernel-crypto-432870dab85a2f69dc417022646cb9a70acf7f94.tar.xz kernel-crypto-432870dab85a2f69dc417022646cb9a70acf7f94.zip | |
exit_notify: kill the wrong capable(CAP_KILL) check
The CAP_KILL check in exit_notify() looks just wrong, kill it.
Whatever logic we have to reset ->exit_signal, the malicious user
can bypass it if it execs the setuid application before exiting.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/exit.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 6686ed1e4aa..32cbf2607cb 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -837,8 +837,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead) */ if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) && (tsk->parent_exec_id != tsk->real_parent->self_exec_id || - tsk->self_exec_id != tsk->parent_exec_id) && - !capable(CAP_KILL)) + tsk->self_exec_id != tsk->parent_exec_id)) tsk->exit_signal = SIGCHLD; signal = tracehook_notify_death(tsk, &cookie, group_dead); |