linux-kernel - Re: Chroot bug

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Message-ID: <46F974B8.3040705@davidnewall.com>
Date:	Wed, 26 Sep 2007 06:21:04 +0930
From:	David Newall <david@...idnewall.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	"Serge E. Hallyn" <serge@...lyn.com>,
	Bill Davidsen <davidsen@....com>,
	Philipp Marek <philipp@...ek.priv.at>, 7eggert@....de,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	majkls <majkls@...pere.com>, bunk@...tum.de,
	linux-kernel@...r.kernel.org
Subject: Re: Chroot bug

Jan Engelhardt wrote:
> On Sep 26 2007 01:11, David Newall wrote:
>   
>> Jan Engelhardt wrote:
>>     
>>> On Sep 26 2007 00:40, David Newall wrote:
>>>   
>>>       
>>>> Miloslav Semler pointed out that a root process can chdir("..") out of its
>>>> chroot.
>>>>         
>>> So what? Just do this: chdir into the root after chroot.
>>>       
>> I don't think so.  His exploit just got me all the way out of a chroot within a
>> chroot within a chroot, inclusive of lots of chdirs.
>>     
>
> Close all fds that point to directories outside the root ;-)
>   

Nope, still gets out.
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