posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW
authorHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Mon, 3 Aug 2009 02:48:19 +0000 (11:48 +0900)
committerIngo Molnar <mingo@elte.hu>
Tue, 4 Aug 2009 08:16:41 +0000 (10:16 +0200)
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@ct.jp.nec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: <stable@kernel.org>
LKML-Reference: <4A764FF3.50607@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/posix-timers.c

index 052ec4d195c7d1ee68fc3b5f9eeb422b932bb3b5..d089d052c4a90f18bb908724e93806f86d0e11aa 100644 (file)
@@ -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);