linux-kernel - [34-longterm 129/260] sched: Fix user time incorrectly accounted as system time on 32-bit

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Message-Id: <1293952756-15010-130-git-send-email-paul.gortmaker@windriver.com>
Date:	Sun,  2 Jan 2011 02:17:05 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Stanislaw Gruszka <sgruszka@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 129/260] sched: Fix user time incorrectly accounted as system time on 32-bit

From: Stanislaw Gruszka <sgruszka@...hat.com>

commit e75e863dd5c7d96b91ebbd241da5328fc38a78cc upstream.

We have 32-bit variable overflow possibility when multiply in
task_times() and thread_group_times() functions. When the
overflow happens then the scaled utime value becomes erroneously
small and the scaled stime becomes i erroneously big.

Reported here:

 https://bugzilla.redhat.com/show_bug.cgi?id=633037
 https://bugzilla.kernel.org/show_bug.cgi?id=16559

Reported-by: Michael Chapman <redhat-bugzilla@...y.puzzling.org>
Reported-by: Ciriaco Garcia de Celis <sysman@...erpilot.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
LKML-Reference: <20100914143513.GB8415@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 kernel/sched.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index b741de5..dd7c170 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3428,9 +3428,9 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
 	rtime = nsecs_to_cputime(p->se.sum_exec_runtime);
 
 	if (total) {
-		u64 temp;
+		u64 temp = rtime;
 
-		temp = (u64)(rtime * utime);
+		temp *= utime;
 		do_div(temp, total);
 		utime = (cputime_t)temp;
 	} else
@@ -3461,9 +3461,9 @@ void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
 	rtime = nsecs_to_cputime(cputime.sum_exec_runtime);
 
 	if (total) {
-		u64 temp;
+		u64 temp = rtime;
 
-		temp = (u64)(rtime * cputime.utime);
+		temp *= cputime.utime;
 		do_div(temp, total);
 		utime = (cputime_t)temp;
 	} else
-- 
1.7.3.3

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