linux-kernel - [tip:timers/urgent] posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC

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Date:	Tue, 4 Aug 2009 08:21:34 GMT
From:	tip-bot for Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	johnstul@...ibm.com, h-shimamoto@...jp.nec.com,
	akpm@...ux-foundation.org, stable@...nel.org, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:timers/urgent] posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW

Commit-ID:  70d715fd0597f18528f389b5ac59102263067744
Gitweb:     http://git.kernel.org/tip/70d715fd0597f18528f389b5ac59102263067744
Author:     Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
AuthorDate: Mon, 3 Aug 2009 11:48:19 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 4 Aug 2009 10:16:41 +0200

posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW

Prevent calling do_nanosleep() with clockid
CLOCK_MONOTONIC_RAW, it may cause oops, such as NULL pointer
dereference.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: John Stultz <johnstul@...ibm.com>
Cc: <stable@...nel.org>
LKML-Reference: <4A764FF3.50607@...jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/posix-timers.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 052ec4d..d089d05 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -202,6 +202,12 @@ static int no_timer_create(struct k_itimer *new_timer)
 	return -EOPNOTSUPP;
 }
 
+static int no_nsleep(const clockid_t which_clock, int flags,
+		     struct timespec *tsave, struct timespec __user *rmtp)
+{
+	return -EOPNOTSUPP;
+}
+
 /*
  * Return nonzero if we know a priori this clockid_t value is bogus.
  */
@@ -254,6 +260,7 @@ static __init int init_posix_timers(void)
 		.clock_get = posix_get_monotonic_raw,
 		.clock_set = do_posix_clock_nosettime,
 		.timer_create = no_timer_create,
+		.nsleep = no_nsleep,
 	};
 
 	register_posix_clock(CLOCK_REALTIME, &clock_realtime);
--
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