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

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Message-ID: <20100114173639.GA15587@us.ibm.com>
Date:	Thu, 14 Jan 2010 11:36:39 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Michael Stone <michael@...top.org>
Cc:	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>,
	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>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Samir Bellabes <sam@...ack.fr>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Pavel Machek <pavel@....cz>, Al Viro <viro@...IV.linux.org.uk>,
	Kyle Moffett <kyle@...fetthome.net>,
	Andrew Morgan <morgan@...nel.org>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

Quoting Michael Stone (michael@...top.org):
> Quoting Michael Stone (michael@...top.org):
> 
> >Ah - but I worry that if you do that Alan or others will object.  Where do
> >you plan to store the disablenet_allowed bit?
> 
> If using prctl directly, I would store the bit in the task->network bitfield
> introduced by the earlier patches.
> 
> >You can use security_prctl() to keep the code out of sys_prctl().
> 
> I don't understand this suggestion; can you clarify? (Also, for what it's
> worth: I intended to put the check for CAP_SETPCAP in prctl_set_network().)
> 
> >but you still have the question of whether you add a bit to the task struct,
> >use task->security and not stack with selinux, use a thread flag, or try to
> >enable stacking of task->security.
> 
> For this revision of the patch, I will use the same approach as the previous
> patches (conditionally compiled task->network).
> 
> Michael
> 
> P.S. - Patches to follow tonight or tomorrow.

Cool I'll just wait for the patches  :)

thanks,
-serge
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