Message-ID: <46F99EDE.70905@davidnewall.com>
Date: Wed, 26 Sep 2007 09:20:54 +0930
From: David Newall <david@davidnewall.com>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: "Serge E. Hallyn" <serge@hallyn.com>, Bill Davidsen <davidsen@tmr.com>,
       Philipp Marek <philipp@marek.priv.at>, 7eggert@gmx.de,
       majkls <majkls@prepere.com>, bunk@fs.tum.de,
       linux-kernel@vger.kernel.org
Subject: Re: Chroot bug
References: <56705.193.171.152.61.1190289559.squirrel@webmail.marek.priv.at>	<46F29A9A.4070806@davidnewall.com>	<200709201817.17282@x5>	<46F2B59F.8090709@davidnewall.com>	<46F2DDD0.3030500@tmr.com>	<46F380E4.4040606@davidnewall.com>	<20070924213215.GA32716@vino.hallyn.com>	<46F83474.5040503@davidnewall.com>	<20070924230008.GA3160@vino.hallyn.com>	<46F8BC8A.7080006@davidnewall.com>	<20070925114947.GA9721@vino.hallyn.com>	<46F91417.9050600@davidnewall.com>	<46F924E3.50205@davidnewall.com>	<20070925163040.12a3c2f8@the-village.bc.nu>	<46F92AAB.1060903@davidnewall.com> <20070925164806.4cadc6a5@the-village.bc.nu>
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Alan Cox wrote:
> On Wed, 26 Sep 2007 01:05:07 +0930
> David Newall <david@davidnewall.com> wrote:
>> Alan Cox wrote:
>>     
>>>> Marek's loading dynamic libraries, it seems clear that the prime purpose 
>>>> of chroot is to aid security.  Being able to cd your way out is handy 
>>>>     
>>>>         
>>> Does it - I can't find any evidence for that.
>>>       
>> It seems self-evident to me.  What do you think is it prime purpose?
>>     
>
> Debugging and testing. At least that is as I understand it much of where
> it came from.
>   

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.
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