diff options
author | Oleg Nesterov <oleg@redhat.com> | 2009-04-06 10:16:02 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-06 17:57:23 -0400 |
commit | 432870dab85a2f69dc417022646cb9a70acf7f94 (patch) | |
tree | 4c9c08d7fb77744b1fd04615a76ab0a9105fad07 | |
parent | 22ae77bc7ac115b9d518d5cbc13d39317079b2b0 (diff) |
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 6686ed1e4aa3..32cbf2607cb0 100644 --- a/kernel/exit.c +++ b/kernel/exit.c | |||
@@ -837,8 +837,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead) | |||
837 | */ | 837 | */ |
838 | if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) && | 838 | if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) && |
839 | (tsk->parent_exec_id != tsk->real_parent->self_exec_id || | 839 | (tsk->parent_exec_id != tsk->real_parent->self_exec_id || |
840 | tsk->self_exec_id != tsk->parent_exec_id) && | 840 | tsk->self_exec_id != tsk->parent_exec_id)) |
841 | !capable(CAP_KILL)) | ||
842 | tsk->exit_signal = SIGCHLD; | 841 | tsk->exit_signal = SIGCHLD; |
843 | 842 | ||
844 | signal = tracehook_notify_death(tsk, &cookie, group_dead); | 843 | signal = tracehook_notify_death(tsk, &cookie, group_dead); |