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time: settimeofday: Validate the values of tv from user

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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>
This commit is contained in:
Sasha Levin
2014-12-03 19:22:48 -05:00
committed by John Stultz
parent b2776bf714
commit 6ada1fc0e1
2 changed files with 17 additions and 0 deletions
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13
include/linux/time.h
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@@ -99,6 +99,19 @@ static inline bool timespec_valid_strict(const struct timespec *ts)
return true;
}
static inline bool timeval_valid(const struct timeval *tv)
{
/* Dates before 1970 are bogus */
if (tv->tv_sec < 0)
return false;
/* Can't have more microseconds then a second */
if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
return false;
return true;
}
extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
#define CURRENT_TIME (current_kernel_time())