linux-kernel - [BUGFIX PATCH 3/2] posix-cpu-timers: check_thread_timers() uses task_sched

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Date:	Mon, 29 Apr 2013 15:17:43 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	linux-kernel@...r.kernel.org
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Olivier Langlois <olivier@...llion01.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	kosaki.motohiro@...il.com
Subject: [BUGFIX PATCH 3/2] posix-cpu-timers: check_thread_timers() uses task_sched_runtime()

A type of tsk->se.sum_exec_runtime is u64. Thus reading it is racy when
running 32bit. We should use task_sched_runtime().

Cc: Olivier Langlois <olivier@...llion01.com>
CC: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 kernel/posix-cpu-timers.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index dc61bc3..651b6c7 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -944,7 +944,8 @@ static void check_thread_timers(struct task_struct *tsk,
 		struct cpu_timer_list *t = list_first_entry(timers,
 						      struct cpu_timer_list,
 						      entry);
-		if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
+		unsigned long long runtime = task_sched_runtime(tsk, false);
+		if (!--maxfire || runtime < t->expires.sched) {
 			tsk->cputime_expires.sched_exp = t->expires.sched;
 			break;
 		}
-- 
1.7.1


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