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authorSasikantha babu <sasikanth.v19@gmail.com>2012-03-21 20:10:54 +0530
committerThomas Gleixner <tglx@linutronix.de>2012-03-30 15:43:33 +0200
commitaa2bf9bc6414b6972b9e51903c1ce7b1f057aee2 (patch)
tree71bde0e8c10be9e425a5bba631a0fe033ba2245f /kernel/itimer.c
parentf52b69f86e27903d6896ed5fa7cd280fec8de532 (diff)
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itimer: Schedule silent NULL pointer fixup in setitimer() for removal
setitimer() should return -EFAULT if called with an invalid pointer for value. The current code excludes a NULL pointer from this rule and silently uses it to stop the timer. This violates the spec. Warn about user space apps which rely on that feature and schedule it for removal. [ tglx: Massaged changelog, warn message and Doc entry ] Signed-off-by: Sasikantha babu <sasikanth.v19@gmail.com> Link: http://lkml.kernel.org/r/1332340854-26053-1-git-send-email-sasikanth.v19@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/itimer.c')
-rw-r--r--kernel/itimer.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/itimer.c b/kernel/itimer.c
index 22000c3db0dd..c70369a74b5a 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -284,8 +284,11 @@ SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value,
if (value) {
if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))
return -EFAULT;
- } else
+ } else {
memset((char *) &set_buffer, 0, sizeof(set_buffer));
+ WARN_ONCE(1, "setitimer: new_value pointer is NULL."
+ " Misfeature support will be removed\n");
+ }
error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);
if (error || !ovalue)