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

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Message-ID: <20100110211609.GC26079@elf.ucw.cz>
Date:	Sun, 10 Jan 2010 22:16:09 +0100
From:	Pavel Machek <pavel@....cz>
To:	James Morris <jmorris@...ei.org>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	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>,
	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>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

On Mon 2010-01-11 08:11:55, James Morris wrote:
> On Fri, 1 Jan 2010, Pavel Machek wrote:
> 
> > > Quoting Michael Stone (michael@...top.org):
> > > > Implement security_* hooks for socket_create, socket_bind, socket_connect,
> > > > socket_sendmsg, and ptrace_access_check which return -EPERM when called from a
> > > > process with networking restrictions. Exempt AF_UNIX sockets.
> > > > 
> > > > Signed-off-by: Michael Stone <michael@...top.org>
> > > 
> > > Acked-by: Serge Hallyn <serue@...ibm.com>
> > 
> > For the record: NAK, as it introduces security holes.
> 
> Please elaborate.

See the mailthread.

Allows user to disable suid program's access to network. That bypasses
audit, and will cause system-wide DoS if suid program decides to go
daemon.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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