linux-kernel - [PATCH 3.4 089/176] time: adjtimex: Validate the ADJ

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Message-Id: <1428569224-23820-89-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:45:37 +0800
From:	lizf@...nel.org
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>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 089/176] time: adjtimex: Validate the ADJ_FREQUENCY values

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

3.4.107-rc1 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>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 kernel/time/ntp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 8b70710..7666b24 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -660,6 +660,13 @@ int do_adjtimex(struct timex *txc)
 			return result;
 	}
 
+	if (txc->modes & ADJ_FREQUENCY) {
+		if (LONG_MIN / PPM_SCALE > txc->freq)
+			return -EINVAL;
+		if (LONG_MAX / PPM_SCALE < txc->freq)
+			return -EINVAL;
+	}
+
 	getnstimeofday(&ts);
 
 	spin_lock_irq(&ntp_lock);
-- 
1.9.1

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