linux-kernel - Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

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Message-ID: <20100111115332.GA1697@atrey.karlin.mff.cuni.cz>
Date:	Mon, 11 Jan 2010 12:53:32 +0100
From:	Pavel Machek <pavel@....cz>
To:	Bryan Donlan <bdonlan@...il.com>
Cc:	Casey Schaufler <casey@...aufler-ca.com>,
	Michael Stone <michael@...top.org>,
	Kyle Moffett <kyle@...fetthome.net>,
	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>,
	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>,
	Am?rico Wang <xiyou.wangcong@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Samir Bellabes <sam@...ack.fr>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)


Hi!

> * If network access is restored over suid, then we can leak data over
> ping or any number of other routes, so that's right out.

ACK.

> * If network access is denied over suid, there are concerns of denial
> of service in certain configurations.

So that should be right out, too.

> * If suid is denied entirely, we have no denial of service or
> information leak concerns via the suid mechanism (since the mechanism
> is completely unusable). And if we really do need to execute something
> at an elevated privilege, we can ask a helper daemon to do it on our
> behalf.

Yes please. This is the obvious solution.
									Pavel

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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