netdev - Re: [PATCH] Prevent reading uninitialized memory with socket filters

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Message-ID: <1289368423.2700.17.camel@edumazet-laptop>
Date:	Wed, 10 Nov 2010 06:53:43 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	drosenberg@...curity.com, netdev@...r.kernel.org,
	stable@...nel.org, security@...nel.org
Subject: Re: [PATCH] Prevent reading uninitialized memory with socket
 filters

Le mardi 09 novembre 2010 à 21:28 -0800, David Miller a écrit :
> From: Dan Rosenberg <drosenberg@...curity.com>
> Date: Tue, 09 Nov 2010 17:28:44 -0500
> 
> > The "mem" array used as scratch space for socket filters is not
> > initialized, allowing unprivileged users to leak kernel stack bytes.
> > 
> > Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
> 
> Prove it.

And once done, add the checks in sk_chk_filter() ?

Allow a load of mem[X] only if a prior store of mem[X] is proven.



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