linux-kernel - Re: Chroot bug

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Message-ID: <46FA334F.7030802@davidnewall.com>
Date:	Wed, 26 Sep 2007 19:54:15 +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:
>> Good call.  Though I suppose, since it's used 24x7 to aid security on 
>> countless production servers, that security dwarfs testing.  Still, 
>> debugging, yes that's valid.
>>
>> I don't suppose it makes and difference; whatever the purpose, a chroot 
>> that doesn't change the root is buggy.
>>     
>
> It does change the root, it just doesn't guarantee you can't change it
> back - which is correct POSIX, Unix, SuS behaviour. So either everyone
> else is wrong or you are.. I know who I am betting on
>   

Charming.  They really say that, do they?  Where?  I find no such thing, 
and I looked.  I did find Open Groups SuS which, similar to SCO's UNIX, 
says:
> 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.

I feel I've presented a good case that that it's a bug.  You made a 
somewhat rude counter-claim, which I don't ascribe to malevolence.  
You're simply disinterested.  Nobody else cares, so why expend effort on 
it, right?  I'll let it drop, but it is a bug.
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