linux-kernel - Re: sys_chroot+sys

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Message-ID: <20070921191012.15a0b51b@the-village.bc.nu>
Date:	Fri, 21 Sep 2007 19:10:12 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Phillip Susi <psusi@....rr.com>
Cc:	David Newall <david@...idnewall.com>,
	Bill Davidsen <davidsen@....com>, majkls <majkls@...pere.com>,
	bunk@...tum.de, linux-kernel@...r.kernel.org
Subject: Re: sys_chroot+sys_fchdir Fix

On Fri, 21 Sep 2007 13:39:34 -0400
Phillip Susi <psusi@....rr.com> wrote:

> David Newall wrote:
> > * In particular, the superuser can escape from a =91chroot jail=92 by d=
> > oing=20
> > =91mkdir foo; chroot foo; cd ..=92.
> 
> No, he can not.

The superuser can escape that way - its expected and fine behaviour
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