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sysrq: Properly check for kernel threads

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There's a real possibility of killing kernel threads that might
have issued use_mm(), so kthread's mm might become non-NULL.

This patch fixes the issue by checking for PF_KTHREAD (just as
get_task_mm()).

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov 2012-02-07 10:49:51 +04:00 committed by Greg Kroah-Hartman
parent e502babe0a
commit d3a532a9c6
1 changed files with 6 additions and 3 deletions
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9
drivers/tty/sysrq.c
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@ -324,9 +324,12 @@ static void send_sig_all(int sig)
read_lock(&tasklist_lock);
for_each_process(p) {
if (p->mm && !is_global_init(p))
/* Not swapper, init nor kernel thread */
force_sig(sig, p);
if (p->flags & PF_KTHREAD)
continue;
if (is_global_init(p))
continue;
force_sig(sig, p);
}
read_unlock(&tasklist_lock);
}