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authorSasha Levin <sasha.levin@oracle.com>2014-12-03 19:22:48 -0500
committerJohn Stultz <john.stultz@linaro.org>2015-01-07 09:49:14 -0800
commit6ada1fc0e1c4775de0e043e1bd3ae9d065491aa5 (patch)
treeb6a02726aa5f93ccb61e7161c7705590424f7830 /kernel
parentb2776bf7149bddd1f4161f14f79520f17fc1d71d (diff)
time: settimeofday: Validate the values of tv from user
An unvalidated user input is multiplied by a constant, which can result in an undefined behaviour for large values. While this is validated later, we should avoid triggering undefined behaviour. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: stable <stable@vger.kernel.org> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> [jstultz: include trivial milisecond->microsecond correction noticed by Andy] Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/time.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/time/time.c b/kernel/time/time.c
index a9ae20fb0b11..22d5d3b73970 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -196,6 +196,10 @@ SYSCALL_DEFINE2(settimeofday, struct timeval __user *, tv,
if (tv) {
if (copy_from_user(&user_tv, tv, sizeof(*tv)))
return -EFAULT;
+
+ if (!timeval_valid(&user_tv))
+ return -EINVAL;
+
new_ts.tv_sec = user_tv.tv_sec;
new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
}