netdev - Re: [PATCH 0/9] Fix leaking of kernel heap addresses in net/

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Date:	Mon, 8 Nov 2010 10:04:48 +0200
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Dan Rosenberg <drosenberg@...curity.com>
Cc:	"chas@....nrl.navy.mil" <chas@....nrl.navy.mil>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"kuznet@....inr.ac.ru" <kuznet@....inr.ac.ru>,
	"pekkas@...core.fi" <pekkas@...core.fi>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"yoshfuji@...ux-ipv6.org" <yoshfuji@...ux-ipv6.org>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"security@...nel.org" <security@...nel.org>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: [PATCH 0/9] Fix leaking of kernel heap addresses in net/

On Sunday 07 November 2010 18:31:32 ext Dan Rosenberg, you wrote:
> This patch series resolves the leakage of kernel heap addresses to
> userspace via network protocol /proc interfaces and public error
> messages.  Revealing this information is a bad idea from a security
> perspective for a number of reasons, the most obvious of which is it
> provides unprivileged users a mechanism by which to create a structure
> in the kernel heap containing function pointers, obtain the address of
> that structure, and overwrite those function pointers by leveraging
> other vulnerabilities.  It is my hope that by eliminating this
> information leakage, in conjunction with making statically-declared
> function pointer tables read-only (to be done in a separate patch
> series), we can at least add a small hurdle for the exploitation of a
> subset of kernel vulnerabilities.

Seems like this patch series is incomplete to me as far as /proc/net is 
concerned.

-- 
Rémi Denis-Courmont
Nokia Devices R&D, Maemo Software, Helsinki
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