linux-kernel - [PATCH 3.2 090/152] time: adjtimex: Validate the ADJ

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Message-ID: <lsq.1424137613.223213443@decadent.org.uk>
Date:	Tue, 17 Feb 2015 01:46:53 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "John Stultz" <john.stultz@...aro.org>,
	"Ingo Molnar" <mingo@...nel.org>,
	"Sasha Levin" <sasha.levin@...cle.com>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: [PATCH 3.2 090/152] time: adjtimex: Validate the ADJ_FREQUENCY values

3.2.67-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sasha Levin <sasha.levin@...cle.com>

commit 5e5aeb4367b450a28f447f6d5ab57d8f2ab16a5f upstream.

Verify that the frequency value from userspace is valid and makes sense.

Unverified values can cause overflows later on.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
[jstultz: Fix up bug for negative values and drop redunent cap check]
Signed-off-by: John Stultz <john.stultz@...aro.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/time/ntp.c | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -608,6 +608,13 @@ int do_adjtimex(struct timex *txc)
 			return -EINVAL;
 	}
 
+	if (txc->modes & ADJ_FREQUENCY) {
+		if (LONG_MIN / PPM_SCALE > txc->freq)
+			return -EINVAL;
+		if (LONG_MAX / PPM_SCALE < txc->freq)
+			return -EINVAL;
+	}
+
 	if (txc->modes & ADJ_SETOFFSET) {
 		struct timespec delta;
 		delta.tv_sec  = txc->time.tv_sec;

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