linux-kernel - Re: Chroot bug

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Message-ID: <20070926005551.GS6800@stusta.de>
Date:	Wed, 26 Sep 2007 02:55:51 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	David Newall <david@...idnewall.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"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

On Wed, Sep 26, 2007 at 09:20:54AM +0930, David Newall wrote:
> Alan Cox wrote:
>> On Wed, 26 Sep 2007 01:05:07 +0930
>> David Newall <david@...idnewall.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.

Incompetent people implementing security solutions are a real problem.

> 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.

But it does not limit what the root user can do after the root was 
changed.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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