diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2009-04-06 16:16:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-05-02 10:57:20 -0700 |
| commit | eab3d542839412d2e7fa712d0dfcc1b90f2755ed (patch) | |
| tree | 7a9c87846bbf1082f81c5b76c2c675025f4a3e27 | |
| parent | 1151ad37983dbd4aa58ebec866042ae762fdc83b (diff) | |
exit_notify: kill the wrong capable(CAP_KILL) check (CVE-2009-1337)
CVE-2009-1337
commit 432870dab85a2f69dc417022646cb9a70acf7f94 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -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 10e393b5381..dd9bfe25471 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -942,8 +942,7 @@ 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); |