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

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Message-ID: <20110302124936.289a1915@chukar>
Date:	Wed, 2 Mar 2011 12:49:36 -0700
From:	Jake Edge <jake@....net>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	linux-kernel@...r.kernel.org, mjt@....msk.ru, arnd@...db.de,
	mirqus@...il.com, netdev@...r.kernel.org,
	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>, 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,
	akpm@...ux-foundation.org
Subject: Re: [PATCH v2] net: don't allow CAP_NET_ADMIN to load non-netdev
 kernel modules

On Wed, 2 Mar 2011 22:43:54 +0300 Vasiliy Kulikov wrote:
> On Wed, Mar 02, 2011 at 12:39 -0700, Jake Edge wrote:
> > > @@ -1765,4 +1765,4 @@ module_exit(ipgre_fini);
> > >  MODULE_LICENSE("GPL");
> > >  MODULE_ALIAS_RTNL_LINK("gre");
> > >  MODULE_ALIAS_RTNL_LINK("gretap");
> > > -MODULE_ALIAS("gre0");
> > > +MODULE_ALIAS_NETDEV("gre0");
> > 
> > that is, instead of replacing MODULE_ALIAS("gre0") with the NETDEV
> > version, don't you want both for backward compatibility?
> 
> The networking script will run with CAP_NET_ADMIN, this would request
> netdev-gre0 and load ip_gre.

and on systems that today use CAP_SYS_MODULE (or really the full set of
capabilities cuz they are running as root)?  won't those try to load
gre0 and fail because that alias doesn't exist?

jake

-- 
Jake Edge - LWN - jake@....net - http://lwn.net
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