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

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Message-Id: <20071107192211.c1c22e97.akpm@linux-foundation.org>
Date:	Wed, 7 Nov 2007 19:22:11 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	ebiederm@...ssion.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysctl: Check length at deprecated_sysctl_warning.

> On Thu, 08 Nov 2007 11:57:26 +0900 Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp> wrote:
> 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))

Well that would have been a nice roothole for someone.  Thanks.
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