linux-kernel - Re: Network isolation with RLIMIT

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Message-ID: <20091217175230.GK9804@basil.fritz.box>
Date:	Thu, 17 Dec 2009 18:52:31 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Michael Stone <michael@...top.org>, 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>,
	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>,
	Mark Seaborn <mrs@...hic-beasts.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: Network isolation with RLIMIT_NETWORK, cont'd.

> Solve that with an unused uid.  That ptrace_may_access check is
> completely non-intuitive, and a problem if we ever remove the current
> == task security module bug avoidance.

I thought he wanted to do that without suid?

If he can change uids he can as well just use full network namespaces.

-Andi

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