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sysrq: Properly check for kernel threads
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>
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1 changed files with 6 additions and 3 deletions
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@ -324,9 +324,12 @@ static void send_sig_all(int sig)
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read_lock(&tasklist_lock);
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for_each_process(p) {
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if (p->mm && !is_global_init(p))
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/* Not swapper, init nor kernel thread */
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force_sig(sig, p);
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if (p->flags & PF_KTHREAD)
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continue;
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if (is_global_init(p))
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continue;
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force_sig(sig, p);
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}
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read_unlock(&tasklist_lock);
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}
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