linux-kernel - Re: [PATCH v2] net: don't allow CAP_NET_ADMIN to load non-netdev kernel modules

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Message-Id: <20110309.140928.70185544.davem@davemloft.net>
Date:	Wed, 09 Mar 2011 14:09:28 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	segoon@...nwall.com
Cc:	mjt@....msk.ru, linux-kernel@...r.kernel.org, arnd@...db.de,
	mirqus@...il.com, netdev@...r.kernel.org,
	bhutchings@...arflare.com, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	eric.dumazet@...il.com, therbert@...gle.com, xiaosuo@...il.com,
	jesse@...ira.com, kees.cook@...onical.com, eugene@...hat.com,
	dan.j.rosenberg@...il.com
Subject: Re: [PATCH v2] net: don't allow CAP_NET_ADMIN to load non-netdev
 kernel modules

From: Vasiliy Kulikov <segoon@...nwall.com>
Date: Thu, 10 Mar 2011 01:06:34 +0300

> On Wed, Mar 02, 2011 at 10:15 +0300, Michael Tokarev wrote:
>> 02.03.2011 00:33, Vasiliy Kulikov wrote:
>> > Since a8f80e8ff94ecba629542d9b4b5f5a8ee3eb565c any process with
>> > CAP_NET_ADMIN may load any module from /lib/modules/.  This doesn't mean
>> > that CAP_NET_ADMIN is a superset of CAP_SYS_MODULE as modules are
>> > limited to /lib/modules/**.  However, CAP_NET_ADMIN capability shouldn't
>> > allow anybody load any module not related to networking.
>> > 
>> > This patch restricts an ability of autoloading modules to netdev modules
>> > with explicit aliases.  This fixes CVE-2011-1019.
>> []
>> > Reference: https://lkml.org/lkml/2011/2/24/203
>> > 
>> > Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
>> 
>> This looks much saner :)
>> 
>> Signed-off-by: Michael Tokarev <mjt@....msk.ru>
> 
> Is there any reason why it is not yet merged?  I've answered to Jake
> Edge that it is not a regression.

I was hoping someone other than me would take this upstream, feel free
to submit it directly to Linus with my ack:

Acked-by: David S. Miller <davem@...emloft.net>
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