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@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>

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 052ec4d..d089d05 100644 (file)
--- 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);