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

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Message-ID: <20091217171447.GJ9804@basil.fritz.box>
Date:	Thu, 17 Dec 2009 18:14:47 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Mark Seaborn <mrs@...hic-beasts.com>
Cc:	Michael Stone <michael@...top.org>,
	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>
Subject: Re: [PATCH] Security: Add prctl(PR_{GET,SET}_NETWORK) interface.

> This is not very good because in some situations it is useful to disable
> connect() and bind() while still allowing ptracing of other processes.  For
> example, Plash creates a new UID for each sandbox and it is possible to use
> strace and gdb inside a sandbox.  Currently Plash is not able to block
> network access or allow only limited network access.  If you treat ptrace()
> this way we won't have the ability to use strace and gdb while limiting
> network access.

No that's not what the hunk does. I first thought the same. But it actually
just limits these processes from initiating ptracing themselves. You can still
attach gdb/strace to them.

Now I'm not sure if that's closing all holes, but at least I can't come
up with any obvious ones currently. I think I would still prefer a more
general security container in general.

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