linux-kernel - Re: [RFC] lsm: namespace hooks

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Date:	Tue, 02 Dec 2014 13:43:13 +0100
From:	Lukasz Pawelczyk <l.pawelczyk@...sung.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Vladimir Davydov <vdavydov@...allels.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Lukasz Pawelczyk <havner@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Matthew Dempsky <mdempsky@...omium.org>,
	Richard Weinberger <richard@....at>,
	Daeseok Youn <daeseok.youn@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	David Rientjes <rientjes@...gle.com>,
	Alex Thorlton <athorlton@....com>,
	Juri Lelli <juri.lelli@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	Dario Faggioli <raistlin@...ux.it>,
	Al Viro <viro@...iv.linux.org.uk>,
	James Morris <james.l.morris@...cle.com>,
	"open list:ABI/API" <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Moore <pmoore@...hat.com>,
	linux-security-module@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] lsm: namespace hooks

On czw, 2014-11-27 at 18:38 +0100, Lukasz Pawelczyk wrote:
> Right now the major issue I see is that LSM by itself is not defined how
> it's going to behave. It's up to a specific LSM module.
> 
> E.g. within the Smack namespace filling the map is a privileged
> operation. So by tying them up you cripple the ability to create a fully
> working user namespace as an unprivileged process.

Entertaining the idea that LSM namespace would be tied to user namespace
(as you suggested) how do you see the limitation I described above?


-- 
Lukasz Pawelczyk
Samsung R&D Institute Poland
Samsung Electronics



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