linux-kernel - [PATCH] sysctl: Check length at deprecated_sysctl

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Date:	Thu, 08 Nov 2007 11:57:26 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:	akpm@...ux-foundation.org
Cc:	ebiederm@...ssion.com, linux-kernel@...r.kernel.org
Subject: [PATCH] sysctl: Check length at deprecated_sysctl_warning.

Original patch assumed args->nlen < CTL_MAXNAME, but it can be false.

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>


--- linux-2.6.22-rc2.orig/kernel/sysctl.c	2007-11-08 10:38:17.000000000 +0900
+++ linux-2.6.22-rc2/kernel/sysctl.c	2007-11-08 11:24:27.000000000 +0900
@@ -2609,6 +2609,10 @@ static int deprecated_sysctl_warning(str
 	int name[CTL_MAXNAME];
 	int i;
 
+	/* Check args->nlen. */
+	if (args->nlen > CTL_MAXNAME)
+		return -EFAULT;
+
 	/* Read in the sysctl name for better debug message logging */
 	for (i = 0; i < args->nlen; i++)
 		if (get_user(name[i], args->name + i))
-
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