linux-kernel - Re: [PATCH v3 4/4] Allow unprivileged chroot when safe

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Message-ID: <1327965046.5355.16.camel@lenny>
Date:	Mon, 30 Jan 2012 18:10:45 -0500
From:	Colin Walters <walters@...bum.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jamie Lokier <jamie@...reable.org>, keescook@...omium.org,
	john.johansen@...onical.com, serge.hallyn@...onical.com,
	coreyb@...ux.vnet.ibm.com, pmoore@...hat.com, eparis@...hat.com,
	djm@...drot.org, segoon@...nwall.com, rostedt@...dmis.org,
	jmorris@...ei.org, scarybeasts@...il.com, avi@...hat.com,
	penberg@...helsinki.fi, viro@...iv.linux.org.uk, mingo@...e.hu,
	akpm@...ux-foundation.org, khilman@...com, borislav.petkov@....com,
	amwang@...hat.com, oleg@...hat.com, ak@...ux.intel.com,
	eric.dumazet@...il.com, gregkh@...e.de, dhowells@...hat.com,
	daniel.lezcano@...e.fr, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, olofj@...omium.org,
	mhalcrow@...gle.com, dlaor@...hat.com, corbet@....net,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3 4/4] Allow unprivileged chroot when safe

On Mon, 2012-01-30 at 14:43 -0800, Andy Lutomirski wrote:

> You don't need a setuid binary.  Just have an initscript set up the bind mounts.

The point is that dchroot is already setuid root, and calls chroot, so
it gains nothing from the ability to do it unprivileged.

(And wow, I just looked at the source, it's a setuid C++ binary!  Using
boost.  Ugh...)



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