linux-kernel - Re: Chroot bug

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Date:	Wed, 26 Sep 2007 20:36:51 +0930
From:	David Newall <david@...idnewall.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	"Serge E. Hallyn" <serge@...lyn.com>,
	Bill Davidsen <davidsen@....com>,
	Philipp Marek <philipp@...ek.priv.at>, 7eggert@....de,
	majkls <majkls@...pere.com>, bunk@...tum.de,
	linux-kernel@...r.kernel.org
Subject: Re: Chroot bug

Alan Cox wrote:
>>> The dot-dot entry in the root directory is interpreted to mean the 
>>> root directory itself. Thus, dot-dot cannot be used to access files 
>>> outside the subtree rooted at the root directory.
>>>       
>
> Which is behaviour chroot preserves properly.
>   

And yet it is the dot-dot entry which is used to access files outside 
the root.

> The specification says explicitly
>
> 	"The process working directory is unaffected by chroot()."
>   

Do you believe that when those words were first written, the hidden 
conflict, namely that it permits dot-dot to access files outside the 
subtree, was understood?  They would have said so if that were the case.
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