netdev - Re: [PATCH 1/3] Security: Add prctl(PR_{GET,SET}

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Date:	Thu, 24 Dec 2009 01:13:23 -0500
From:	Michael Stone <michael@...top.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Andi Kleen <andi@...stfloor.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>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Michael Stone <michael@...top.org>
Subject: Re: [PATCH 1/3] Security: Add prctl(PR_{GET,SET}_NETWORK)

> Eric Biederman writes:
>> Alan Cox <alan@...rguk.ukuu.org.uk> writes:
>>> Michael Stone writes:
>>>> the LSM-based version *does not* resolve the situation to my satisfaction as a
>>>> userland hacker due to the well-known and long-standing adoption and
>>>> compositionality problems facing small LSMs. ;)
>>>
>>> For things like Fedora it's probably an "interesting idea, perhaps we
>>> should do it using SELinux" sort of problem, but a config option for a
>>> magic network prctl is also going to be hard to adopt without producing a
>>> good use case - and avoiding that by dumping crap into everyones kernel
>>> fast paths isn't a good idea either.
>
>If I understand the problem the goal is to disable access to ipc
>mechanism that don't have the usual unix permissions.  To get
>something that is usable for non-root processes, and to get something
>that is widely deployed so you don't have to jump through hoops in
>end user applications to use it.

Eric,

You understand correctly. Thank you for this cogent restatement.

>We have widely deployed mechanisms that are what you want or nearly
>what you want already in the form of the various namespaces built for
>containers.

It's true that your work is closer to what I want than anything else that I've
seen so far...

>I propose you introduce a permanent disable of executing suid 
>applications. 

I'm open to the idea but I don't understand the need that motivates it yet.

Could you please explain further? (or point me to an existing explanation?)

>After which point it is another trivial patch to allow unsharing of
>the network namespace if executing suid applications are disabled.

How do you propose to address the problem with the Unix sockets?

Regards,

Michael
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