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authorOleg Nesterov <oleg@redhat.com>2017-11-18 00:30:04 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-18 01:10:03 +0100
commitac25385089f673560867eb5179228a44ade0cfc1 (patch)
treedb30cc877ae01470a59fe0a1ccb633b8fb945053
parentkernel/signal.c: protect the traced SIGNAL_UNKILLABLE tasks from SIGKILL (diff)
downloadlinux-ac25385089f673560867eb5179228a44ade0cfc1.tar.xz
linux-ac25385089f673560867eb5179228a44ade0cfc1.zip
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>
-rw-r--r--kernel/signal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index be5913134742..01ba166a5e3a 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);