linux-kernel - [PATCH 3.12 151/176] time: adjtimex: Validate the ADJ

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Message-Id: <64678c15381f8efa6beeb565ada1021e45f50c7a.1422455352.git.jslaby@suse.cz>
Date:	Wed, 28 Jan 2015 15:29:41 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 151/176] time: adjtimex: Validate the ADJ_FREQUENCY values

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 kernel/time/ntp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index af8d1d4f3d55..28db9bedc857 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -631,6 +631,13 @@ int ntp_validate_timex(struct timex *txc)
 	if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
 		return -EPERM;
 
+	if (txc->modes & ADJ_FREQUENCY) {
+		if (LONG_MIN / PPM_SCALE > txc->freq)
+			return -EINVAL;
+		if (LONG_MAX / PPM_SCALE < txc->freq)
+			return -EINVAL;
+	}
+
 	return 0;
 }
 
-- 
2.2.2

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