linux-kernel - Re: sys_chroot+sys

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Message-ID: <46F9752C.5080807@cfl.rr.com>
Date:	Tue, 25 Sep 2007 16:53:00 -0400
From:	Phillip Susi <psusi@....rr.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

Alan Cox wrote:
> 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

Does not work for me, and that would be the EXACT thing chroot is 
supposed to prevent.  Maybe you guys are thinking of a program that 
calls chroot() but leaves cwd outside the chroot still being able to 
navigate outside of it?


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