linux-kernel - Re: Chroot bug

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Message-ID: <20070926104500.GA4354@dspnet.fr.eu.org>
Date:	Wed, 26 Sep 2007 12:45:00 +0200
From:	Olivier Galibert <galibert@...ox.com>
To:	David Newall <david@...idnewall.com>
Cc:	Kyle Moffett <mrmacman_g4@....com>, Adrian Bunk <bunk@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Bill Davidsen <davidsen@....com>,
	Philipp Marek <philipp@...ek.priv.at>, 7eggert@....de,
	majkls <majkls@...pere.com>, bunk@...tum.de,
	linux-kernel@...r.kernel.org
Subject: Re: Chroot bug

On Wed, Sep 26, 2007 at 07:57:38PM +0930, David Newall wrote:
> As has been said, there are thousands of ways to break out of a chroot.  
> It's just that one of them should not be that chroot lets you walk out.  

chroot does not allow you to walk out if you're in.  It only allows
you to walk outside if you're *already* out.  That's the way it is
defined.  Those who want some kind of chroot for security reasons
should look at (BSD's ?) jail, and/or hypervisors.

  OG.
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