The patch titled
Subject: kernel/signal.c: protect the SIGNAL_UNKILLABLE tasks from !sig_kernel_only() signals
has been added to the -mm tree. Its filename is
protect-the-signal_unkillable-tasks-from-sig_kernel_only-signals.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/protect-the-signal_unkillable-tasks-from-sig_kernel_only-signals.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/protect-the-signal_unkillable-tasks-from-sig_kernel_only-signals.patch
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------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Tested-by: Kyle Huey <me@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/signal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/signal.c~protect-the-signal_unkillable-tasks-from-sig_kernel_only-signals kernel/signal.c
--- a/kernel/signal.c~protect-the-signal_unkillable-tasks-from-sig_kernel_only-signals
+++ a/kernel/signal.c
@@ -78,7 +78,7 @@ static int sig_task_ignored(struct task_
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);
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
protect-the-traced-signal_unkillable-tasks-from-sigkill.patch
protect-the-signal_unkillable-tasks-from-sig_kernel_only-signals.patch
remove-the-no-longer-needed-signal_unkillable-check-in-complete_signal.patch
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