From: Sasha Levin <sasha.levin@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: Sasha Levin <sasha.levin@oracle.com>,
John Stultz <john.stultz@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH] time: make sure tz_minuteswest is set to a valid value when setting time
Date: Mon, 1 Dec 2014 23:04:06 -0500 [thread overview]
Message-ID: <1417493050-13594-2-git-send-email-sasha.levin@oracle.com> (raw)
In-Reply-To: <1417493050-13594-1-git-send-email-sasha.levin@oracle.com>
Invalid values may overflow later, leading to undefined behaviour when
multiplied by 60 to get the amount of seconds.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
kernel/time/time.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 7399a73..9ec4fa5 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -173,6 +173,10 @@ int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz)
return error;
if (tz) {
+ /* Verify we're witin the +-15 hrs range */
+ if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
+ return -EINVAL;
+
sys_tz = *tz;
update_vsyscall_tz();
if (firsttime) {
--
1.7.10.4
next prev parent reply other threads:[~2014-12-02 4:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-02 4:04 [PATCH] time: do a safe overflow check in ktime_add_safe Sasha Levin
2014-12-02 4:04 ` Sasha Levin [this message]
2014-12-02 4:04 ` [PATCH] vfs: calculate seek offsets using unsigned variables Sasha Levin
2014-12-02 4:04 ` [PATCH] mm: fadvise: avoid signed integer overflow calculating offset Sasha Levin
2014-12-02 4:04 ` [PATCH] time: settimeofday: validate the values of tv fomr user Sasha Levin
2014-12-02 11:16 ` Thomas Gleixner
2014-12-02 4:04 ` [PATCH] fs: sync_file_range: avoid overflowing signed calculation Sasha Levin
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