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| author | Sasha Levin <sasha.levin@oracle.com> | 2014-12-04 01:22:48 +0100 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2015-01-07 18:49:14 +0100 |
| commit | 6ada1fc0e1c4775de0e043e1bd3ae9d065491aa5 (patch) | |
| tree | b6a02726aa5f93ccb61e7161c7705590424f7830 /kernel/time | |
| parent | Linux 3.18 (diff) | |
| download | linux-6ada1fc0e1c4775de0e043e1bd3ae9d065491aa5.tar.xz linux-6ada1fc0e1c4775de0e043e1bd3ae9d065491aa5.zip | |
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/time')
| -rw-r--r-- | kernel/time/time.c | 4 |
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; } |