Re: Chroot bug

[Adrian Bunk <bunk@kernel.org>]

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@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.

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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