From: Oleg Nesterov Date: Fri, 17 Nov 2017 23:30:04 +0000 (-0800) Subject: kernel/signal.c: protect the SIGNAL_UNKILLABLE tasks from !sig_kernel_only() signals X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ac25385089f673560867eb5179228a44ade0cfc1;p=linux.git 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 Tested-by: Kyle Huey Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/signal.c b/kernel/signal.c index be59131347423..01ba166a5e3ac 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -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);