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

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Message-ID: <20100112075927.GA24256@atrey.karlin.mff.cuni.cz>
Date:	Tue, 12 Jan 2010 08:59:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	Valdis.Kletnieks@...edu
Cc:	Michael Stone <michael@...top.org>,
	James Morris <jmorris@...ei.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>,
	Bryan Donlan <bdonlan@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	"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>,
	Casey Schaufler <casey@...aufler-ca.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

> On Sun, 10 Jan 2010 22:58:48 +0100, Pavel Machek said:
> 
> > Scenario 2:
> > 
> > Mallory calls disablenetwork, calls sendmail as the first user after
> > boot; sendmail can't deliver anything (its network is disabled), but
> > starts forking and taking requests for other users, DoSing the mail
> > delivery.
> 
> You need to be root to start sendmail as a daemon.

Well, maybe, but mailer system where first user starts is as a daemon
makes sense... same for authentication system, etc. And it was okay
before disablenetwork come.
									Pavel

-- 
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