linux-kernel - [PATCH 4/4] kmemcheck: fix __send

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Date:	Sat, 16 May 2009 11:51:20 +0200
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Pekka Enberg <penberg@...helsinki.fi>, Ingo Molnar <mingo@...e.hu>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: [PATCH 4/4] kmemcheck: fix __send_signal() false positive

Hide the false positive using the __GFP_NOTRACK_FALSE_POSITIVE flag.
Also made the rlimit override code a bit clearer by introducing a new
variable.

Cc: Oleg Nesterov <oleg@...sign.ru>
Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
---
 kernel/signal.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index d803473..57c7440 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -829,6 +829,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
 {
 	struct sigpending *pending;
 	struct sigqueue *q;
+	int override_rlimit;
 
 	trace_sched_signal_send(sig, t);
 
@@ -860,9 +861,13 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
 	   make sure at least one signal gets delivered and don't
 	   pass on the info struct.  */
 
-	q = __sigqueue_alloc(t, GFP_ATOMIC, (sig < SIGRTMIN &&
-					     (is_si_special(info) ||
-					      info->si_code >= 0)));
+	if (sig < SIGRTMIN)
+		override_rlimit = (is_si_special(info) || info->si_code >= 0);
+	else
+		override_rlimit = 0;
+
+	q = __sigqueue_alloc(t, GFP_ATOMIC | __GFP_NOTRACK_FALSE_POSITIVE,
+		override_rlimit);
 	if (q) {
 		list_add_tail(&q->list, &pending->list);
 		switch ((unsigned long) info) {
-- 
1.6.0.6

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