Commit ac253850 authored Nov 17, 2017 by Oleg Nesterov Committed by Linus Torvalds Nov 17, 2017

kernel/signal.c: protect the SIGNAL_UNKILLABLE tasks from !sig_kernel_only() signals

Change sig_task_ignored() to drop the SIG_DFL && !sig_kernel_only()
signals even if force == T.  This simplifies the next change and this
matches the same check in get_signal() which will drop these signals
anyway.

Link: http://lkml.kernel.org/r/20171103184227.GC21036@redhat.com


Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: Kyle Huey <me@kylehuey.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 628c1bcb

kernel/signal.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -78,7 +78,7 @@ static int sig_task_ignored(struct task_struct *t, int sig, bool force)
		handler = sig_handler(t, sig);

		if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
		handler == SIG_DFL && !force)
		handler == SIG_DFL && !(force && sig_kernel_only(sig)))
		return 1;

		return sig_handler_ignored(handler, sig);

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