linux-kernel - Re: Chroot bug

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Date:	Tue, 25 Sep 2007 18:19:41 +0200
From:	Miloslav Semler <majkls@...pere.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	serge@...lyn.com, davidsen@....com, philipp@...ek.priv.at,
	7eggert@....de, alan@...rguk.ukuu.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: Chroot bug


>>> 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 ;-)
>
>   
This  does not help.  Let's try:
chroot somewhere
mkdir foo
fd = open /
chroot foo
fchdir fd
chdir ".."
....
chdir ".."
chroot "."
so you are in root.


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