linux-kernel - Re: Network isolation with RLIMIT

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Message-ID: <3e8340490912171024n2120e88q569c69fe7d09140f@mail.gmail.com>
Date:	Thu, 17 Dec 2009 13:24:50 -0500
From:	Bryan Donlan <bdonlan@...il.com>
To:	Mark Seaborn <mrs@...hic-beasts.com>
Cc:	Michael Stone <michael@...top.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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>,
	Rémi Denis-Courmont <rdenis@...phalempin.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	James Morris <jmorris@...ei.org>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: Network isolation with RLIMIT_NETWORK, cont'd.

On Thu, Dec 17, 2009 at 12:31 PM, Mark Seaborn <mrs@...hic-beasts.com> wrote:

> Maybe we could fix (b) by making mount namespaces into first class objects
> that can be named through a file descriptor, so that one process can
> manipulate another process's namespace without itself being subject to the
> namespace.

Can this be done using openat() and friends currently? It would seem
the natural way to implement this; open /proc/(pid)/root, then
openat() things from there (or even chdir to it and see the mounts
that it sees from there...)
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