linux-kernel - Re: [PATCH] tg3: fix length overflow in VPD firmware parsing

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Date:	Wed, 27 Mar 2013 14:11:26 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	keescook@...omium.org
Cc:	linux-kernel@...r.kernel.org, mcarlson@...adcom.com,
	mchan@...adcom.com, netdev@...r.kernel.org, oded@...vatecore.com,
	spender@...ecurity.net, benli@...adcom.com
Subject: Re: [PATCH] tg3: fix length overflow in VPD firmware parsing

From: Kees Cook <keescook@...omium.org>
Date: Wed, 27 Mar 2013 09:40:50 -0700

> Commit 184b89044fb6e2a74611dafa69b1dce0d98612c6 ("tg3: Use VPD fw version
> when present") introduced VPD parsing that contained a potential length
> overflow.
> 
> Limit the hardware's reported firmware string length (max 255 bytes) to
> stay inside the driver's firmware string length (32 bytes). On overflow,
> truncate the formatted firmware string instead of potentially overwriting
> portions of the tg3 struct.
> 
> http://cansecwest.com/slides/2013/PrivateCore%20CSW%202013.pdf
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Reported-by: Oded Horovitz <oded@...vatecore.com>
> Reported-by: Brad Spengler <spender@...ecurity.net>

Applied.
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