linux-kernel - [PATCH] posix-timers: fix oops in clock_nanosleep() with CLOCK_MONOTONIC

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Message-ID: <4A764FF3.50607@ct.jp.nec.com>
Date:	Mon, 03 Aug 2009 11:48:19 +0900
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: [PATCH] posix-timers: fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

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>
---
 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);
-- 
1.6.3.3

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