linux-kernel - Re: sys_chroot+sys

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Message-ID: <20070919104018.3a6bcfb1@the-village.bc.nu>
Date:	Wed, 19 Sep 2007 10:40:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	majkls <majkls@...pere.com>
Cc:	bunk@...tum.de, linux-kernel@...r.kernel.org
Subject: Re: sys_chroot+sys_fchdir Fix

On Wed, 19 Sep 2007 09:19:50 +0200
majkls <majkls@...pere.com> wrote:

> Hello,
> here is an fix to an exploit (obtained somewhere in internet). This 
> exploit can workaround chroot with CAP_SYS_CHROOT. It is also possible 
> (with sufficient filedescriptor (if there is na directory fd opened in 
> root) workaround chroot with sys_fchdir. This patch fixes it.


If you have the ability to use chroot() you are root. If you are root you
can walk happily out of any chroot by a thousand other means.

Alan
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