linux-kernel - Re: [RFC][PATCH v3] Unprivileged: Disable raising of privileges

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Message-ID: <m1oclfkmuz.fsf@fess.ebiederm.org>
Date:	Thu, 31 Dec 2009 10:41:08 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Andrew G. Morgan" <morgan@...nel.org>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Bryan Donlan <bdonlan@...il.com>,
	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 v3] Unprivileged: Disable raising of privileges

"Andrew G. Morgan" <morgan@...nel.org> writes:

> Since there is already independent support for disabling file
> capabilities (the privilege escalation part), I see these two
> mechanisms as separable.

I guess there is something that resembles support for disabling
privilege escalation.  The problem is that it requires privilege to
use it.

I have no problem with expressing this in a fine grained manner internally
to the kernel but the user space interface needs to be atomic so that
we can enable this all without privilege.

Further I may be off but I think the implementation would be more
challenging than what I have already posted.  That doesn't mean it
won't be more useful long term.

Eric
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