linux-kernel - Re: [RFC][PATCH] Unprivileged: Disable acquisition of privileges

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Message-ID: <m1r5qdt721.fsf@fess.ebiederm.org>
Date:	Tue, 29 Dec 2009 20:33:10 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Bryan Donlan <bdonlan@...il.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Benny Amorsen <benny+usenet@...rsen.dk>,
	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>,
	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>,
	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>
Subject: Re: [RFC][PATCH] Unprivileged: Disable acquisition of privileges

Bryan Donlan <bdonlan@...il.com> writes:

> Is this sufficient for other security models such as selinux or
> TOMOYO? Can processes in these models gain privileges through means
> not restricted here?

The LSM is primarily about returning -EPERM more often.
Except for the prctl and the capability hooks I am not aware
of anywhere a LSM can increase a processes capabilities.

> Also, perhaps there should be a corresponding GET prctl?

Probably for the final version.

Eric

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