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SubjectRe: sys_chroot+sys_fchdir Fix
Serge E. Hallyn wrote:
> Quoting David Newall (david@davidnewall.com):
>
>> Serge E. Hallyn wrote:
>>
>>> Quoting David Newall (david@davidnewall.com):
>>>
>>>
>>>> It might be tidy if pivot_root could be used (instead of a hack based on
>>>> a chroot bug), but it'd still be unportable.
>>>>
>>>>
>>> It can.
>>>
>>> Please re-read my previous msg.
>>>
>> I read it. Currently pivot_root can't be used to affect a single process.
>>
>
> No. If you unshare your mounts namespace immediately before pivot_root,
> then pivot_root will only affect that single process.
>

Bugger. You're right, I didn't read your previous message; I thought I
had but I was wrong.

>> unshare(CLONE_NEWNS);
>> chdir(new_dir);
>> pivot_root(new_dir, oldroot);


After further RTFMing, and assuming "any processes or threads which
use the old root directory" means what you imply, and surely it does,
then I agree: pivot_root already does the job. Does anybody still need
to use a bug in chroot?
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