[merged] protect-the-traced-signal_unkillable-tasks-from-sigkill.patch removed from -mm tree

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The patch titled
     Subject: kernel/signal.c: protect the traced SIGNAL_UNKILLABLE tasks from SIGKILL
has been removed from the -mm tree.  Its filename was
     protect-the-traced-signal_unkillable-tasks-from-sigkill.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: kernel/signal.c: protect the traced SIGNAL_UNKILLABLE tasks from SIGKILL

The comment in sig_ignored() says "Tracers may want to know about even
ignored signals" but SIGKILL can not be reported to debugger and it is
just wrong to return 0 in this case: SIGKILL should only kill the
SIGNAL_UNKILLABLE task if it comes from the parent ns.

Change sig_ignored() to ignore ->ptrace if sig == SIGKILL and rely on
sig_task_ignored().

SISGTOP coming from within the namespace is not really right too but at
least debugger can intercept it, and we can't drop it here because this
will break "gdb -p 1": ptrace_attach() won't work.  Perhaps we will add
another ->ptrace check later, we will see.

Link: http://lkml.kernel.org/r/20171103184206.GB21036@xxxxxxxxxx
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Tested-by: Kyle Huey <me@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 kernel/signal.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff -puN kernel/signal.c~protect-the-traced-signal_unkillable-tasks-from-sigkill kernel/signal.c
--- a/kernel/signal.c~protect-the-traced-signal_unkillable-tasks-from-sigkill
+++ a/kernel/signal.c
@@ -94,13 +94,15 @@ static int sig_ignored(struct task_struc
 	if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
 		return 0;
 
-	if (!sig_task_ignored(t, sig, force))
-		return 0;
-
 	/*
-	 * Tracers may want to know about even ignored signals.
+	 * Tracers may want to know about even ignored signal unless it
+	 * is SIGKILL which can't be reported anyway but can be ignored
+	 * by SIGNAL_UNKILLABLE task.
 	 */
-	return !t->ptrace;
+	if (t->ptrace && sig != SIGKILL)
+		return 0;
+
+	return sig_task_ignored(t, sig, force);
 }
 
 /*
_

Patches currently in -mm which might be from oleg@xxxxxxxxxx are


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