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[PATCH] sigkill priority fix

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If SIGKILL does not have priority, we cannot instantly kill task before it
makes some unexpected job.  It can be critical, but we were unable to
reproduce this easily until Heiko Carstens <Heiko.Carstens@de.ibm.com>
reported this problem on LKML.

Signed-Off-By: Kirill Korotaev <dev@sw.ru>
Signed-Off-By: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Kirill Korotaev 2005-05-24 19:29:47 -07:00 committed by Linus Torvalds
parent 6431e6a28e
commit c33880aadd
1 changed files with 10 additions and 1 deletions
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11
kernel/signal.c
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@ -522,7 +522,16 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
{
int sig = 0;
sig = next_signal(pending, mask);
/* SIGKILL must have priority, otherwise it is quite easy
* to create an unkillable process, sending sig < SIGKILL
* to self */
if (unlikely(sigismember(&pending->signal, SIGKILL))) {
if (!sigismember(mask, SIGKILL))
sig = SIGKILL;
}
if (likely(!sig))
sig = next_signal(pending, mask);
if (sig) {
if (current->notifier) {
if (sigismember(current->notifier_mask, sig)) {