Commit c33880aa authored May 24, 2005 by Kirill Korotaev Committed by Linus Torvalds May 24, 2005

[PATCH] sigkill priority fix



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>

parent 6431e6a2

kernel/signal.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -522,6 +522,15 @@ static int __dequeue_signal(struct sigpending pending, sigset_t mask,
		{
		int sig = 0;

		/* 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) {

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