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authorzhengbin <zhengbin13@huawei.com>2019-07-07 08:51:41 +0800
committerThomas Gleixner <tglx@linutronix.de>2019-07-07 12:05:40 +0200
commit9176ab1b848059a0cd9caf39f0cebaa1b7ec5ec2 (patch)
tree7100c6b23fae3ed167439119a7ca1ac71344d6eb
parent28ef2db8866495150e4260773fead8313f1a5625 (diff)
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
-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 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;
}