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| author | zhengbin <zhengbin13@huawei.com> | 2019-07-07 08:51:41 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-07-07 12:05:40 +0200 |
| commit | 9176ab1b848059a0cd9caf39f0cebaa1b7ec5ec2 (patch) | |
| tree | 7100c6b23fae3ed167439119a7ca1ac71344d6eb /kernel/time | |
| parent | 28ef2db8866495150e4260773fead8313f1a5625 (diff) | |
| download | linux-9176ab1b848059a0cd9caf39f0cebaa1b7ec5ec2.tar.bz2 | |
time: Validate user input in compat_settimeofday()
The user value is validated after converting the timeval to a timespec, but
for a wide range of negative tv_usec values the multiplication overflow turns
them in positive numbers. So the 'validated later' is not catching the
invalid input.
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/1562460701-113301-1-git-send-email-zhengbin13@huawei.com
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 7f7d6914ddd5..5c54ca632d08 100644 --- a/kernel/time/time.c +++ b/kernel/time/time.c @@ -251,6 +251,10 @@ COMPAT_SYSCALL_DEFINE2(settimeofday, struct old_timeval32 __user *, tv, if (tv) { if (compat_get_timeval(&user_tv, 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; } |