linux-kernel - Re: [PATCH] Security: Add prctl(PR_{GET,SET}

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Message-ID: <20091217085234.GF9804@basil.fritz.box>
Date:	Thu, 17 Dec 2009 09:52:34 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Michael Stone <michael@...top.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Ulrich Drepper <drepper@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org, David Lang <david@...g.hm>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Bryan Donlan <bdonlan@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	James Morris <jmorris@...ei.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Mark Seaborn <mrs@...hic-beasts.com>
Subject: Re: [PATCH] Security: Add prctl(PR_{GET,SET}_NETWORK) interface.

On Wed, Dec 16, 2009 at 08:25:40PM -0500, Michael Stone wrote:
> Andi Kleen wrote:
>> On Wed, Dec 16, 2009 at 10:32:43AM -0500, Michael Stone wrote:
>>> Daniel Bernstein has observed [1] that security-conscious userland processes
>>> may benefit from the ability to irrevocably remove their ability to create,
>>> bind, connect to, or send messages except in the case of previously
>>> connected sockets or AF_UNIX filesystem sockets. We provide this facility by
>>> implementing support for a new prctl(PR_SET_NETWORK) flag named
>>> PR_NETWORK_OFF.
>>>
>>> This facility is particularly attractive to security platforms like OLPC
>>> Bitfrost [2] and to isolation programs like Rainbow [3] and Plash [4].
>>
>> What would stop them from ptracing someone else running under the same
>> uid who still has the network access? 
>
> Just like in the (revised from last year) rlimits version, there's a hunk in
> the prctl_network semantics patch which disables networking-via-ptrace() like
> so:

Hmm, ok. Missed that. I hope there are not more big holes. Obviously
can't allow to change other executables, but I guess that's ok.

It's still some overlap with network name spaces, but there are also
some not directly mappable semantic differences.

I haven't reviewed the patches in detail btw.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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