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authorOleg Nesterov <oleg@redhat.com>2009-04-06 16:16:02 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-06 14:57:23 -0700
commit432870dab85a2f69dc417022646cb9a70acf7f94 (patch)
tree4c9c08d7fb77744b1fd04615a76ab0a9105fad07
parent22ae77bc7ac115b9d518d5cbc13d39317079b2b0 (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.c3
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)
*/
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);