>> This  does not help.  Let's try:
quoted text
>> chroot somewhere
>> mkdir foo
>> fd = open /
>> chroot foo
>>     
>
> ('fd' implicitly closed and chdir to /foo)
>   
Really? Try it. I am sure, that this works. You can create directory in 
chroot and break chroot by this. fd is not closed, because linux doesn't 
close descriptors by chroot syscall. this can be done every time if you 
have CAP_SYS_CHROOT.
quoted text
>   
>> fchdir fd
>>     
>
> -EINVAL
>
>   
>> chdir ".."
>>     
>
> /../ => /
>
>   
>> ....
>> chdir ".."
>> chroot "."
>> so you are in root.
>>     
>
> so we remain in chroot.
>   

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