linux-kernel - [PATCH 3/3] 3.0.y: time: Move ktime_t overflow checking into timespec_valid

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1347410993-19004-4-git-send-email-john.stultz@linaro.org>
Date:	Tue, 11 Sep 2012 20:49:53 -0400
From:	John Stultz <john.stultz@...aro.org>
To:	stable@...r.kernel.org
Cc:	John Stultz <john.stultz@...aro.org>,
	Zhouping Liu <zliu@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/3] 3.0.y: time: Move ktime_t overflow checking into timespec_valid_strict

This is a -stable backport of cee58483cf56e0ba355fdd97ff5e8925329aa936

Andreas Bombe reported that the added ktime_t overflow checking added to
timespec_valid in commit 4e8b14526ca7 ("time: Improve sanity checking of
timekeeping inputs") was causing problems with X.org because it caused
timeouts larger then KTIME_T to be invalid.

Previously, these large timeouts would be clamped to KTIME_MAX and would
never expire, which is valid.

This patch splits the ktime_t overflow checking into a new
timespec_valid_strict function, and converts the timekeeping codes
internal checking to use this more strict function.

Reported-and-tested-by: Andreas Bombe <aeb@...ian.org>
Cc: Zhouping Liu <zliu@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Linux Kernel <linux-kernel@...r.kernel.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 include/linux/time.h      |    7 +++++++
 kernel/time/timekeeping.c |   14 ++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/include/linux/time.h b/include/linux/time.h
index c8f7233..8c0216e 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -125,6 +125,13 @@ static inline bool timespec_valid(const struct timespec *ts)
 	/* Can't have more nanoseconds then a second */
 	if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
 		return false;
+	return true;
+}
+
+static inline bool timespec_valid_strict(const struct timespec *ts)
+{
+	if (!timespec_valid(ts))
+		return false;
 	/* Disallow values that could overflow ktime_t */
 	if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
 		return false;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 3bbaf2d0..c3cbd8c 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -382,7 +382,7 @@ int do_settimeofday(const struct timespec *tv)
 	struct timespec ts_delta;
 	unsigned long flags;
 
-	if (!timespec_valid(tv))
+	if (!timespec_valid_strict(tv))
 		return -EINVAL;
 
 	write_seqlock_irqsave(&xtime_lock, flags);
@@ -428,7 +428,7 @@ int timekeeping_inject_offset(struct timespec *ts)
 	timekeeping_forward_now();
 
 	tmp = timespec_add(xtime,  *ts);
-	if (!timespec_valid(&tmp)) {
+	if (!timespec_valid_strict(&tmp)) {
 		ret = -EINVAL;
 		goto error;
 	}
@@ -591,7 +591,7 @@ void __init timekeeping_init(void)
 	struct timespec now, boot;
 
 	read_persistent_clock(&now);
-	if (!timespec_valid(&now)) {
+	if (!timespec_valid_strict(&now)) {
 		pr_warn("WARNING: Persistent clock returned invalid value!\n"
 			"         Check your CMOS/BIOS settings.\n");
 		now.tv_sec = 0;
@@ -599,7 +599,7 @@ void __init timekeeping_init(void)
 	}
 
 	read_boot_clock(&boot);
-	if (!timespec_valid(&boot)) {
+	if (!timespec_valid_strict(&boot)) {
 		pr_warn("WARNING: Boot clock returned invalid value!\n"
 			"         Check your CMOS/BIOS settings.\n");
 		boot.tv_sec = 0;
@@ -649,6 +649,12 @@ static void update_sleep_time(struct timespec t)
  */
 static void __timekeeping_inject_sleeptime(struct timespec *delta)
 {
+	if (!timespec_valid_strict(delta)) {
+		printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid "
+					"sleep delta value!\n");
+		return;
+	}
+
 	xtime = timespec_add(xtime, *delta);
 	wall_to_monotonic = timespec_sub(wall_to_monotonic, *delta);
 	update_sleep_time(timespec_add(total_sleep_time, *delta));
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/