linux-kernel - Re: [PATCH] staging: dgnc: fix potential format string flaw

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Message-ID: <20130911093118.GD25896@mwanda>
Date:	Wed, 11 Sep 2013 12:31:18 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Joe Perches <joe@...ches.com>, devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tushar Behera <tushar.behera@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Lidza Louina <lidza.louina@...il.com>
Subject: Re: [PATCH] staging: dgnc: fix potential format string flaw

On Tue, Sep 10, 2013 at 10:19:17PM -0700, Kees Cook wrote:
> In the former case, format characters will get processed by the
> sprintf logic. In the latter, they are printed as-is. In this specific
> case, if there was a way to inject strings like "ohai %n" into the
> msgbuf string, the former would actually attempt to resolve the %n. In
> the simple case, this could lead to Oopses, and in the unlucky case,
> it could allow arbitrary memory writing and execution control.
> 
> http://en.wikipedia.org/wiki/Uncontrolled_format_string

The kernel ignores %n so hopefully it can't actually write to memory.

regards,
dan carpenter

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