Alan Cox wrote:
quoted text
>>> 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.

quoted text
> 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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