Re: Current state of CLONE_NEWUSER?

[ebiederm@xmission.com (Eric W. Biederman)]

"Michael Kerrisk" <mtk.manpages@googlemail.com> writes:

> Hi Eric,
>
> On Wed, Nov 19, 2008 at 8:41 PM, Eric W. Biederman
> <ebiederm@xmission.com> wrote:
>> "Michael Kerrisk" <mtk.manpages@googlemail.com> writes:
>>
>>> Hi Serge,
>>>
>>> What is the current status of CLONE_NEWUSER?  I'm currently trying to
>>> test this flag in preparation for documenting it in the clone(2) man
>>> page, but am running into an ENOMEM error from the clone() call, which
>>> seems to occur after a failure in kobject_init_and_add() in the
>>> following call sequence:
>>>
>>> clone_user_ns() --> alloc_uid() --> uids_user_create() -->
>>> kobject_init_and_add()
>>>
>>> Are there already some test programs somewhere?  Is there any
>>> documentation already available for this flag?
>>
>> This code is definitely still under development.
>>
>> When complete it should be able to create a new uid namespace,
>> as an unprivileged user.  Creating a new process with uid == gid == 0.
>> Have a full set of caps.  And have permission to do nothing on the system
>> except read world readable files and write world writable files.
>
> Thanks for the info,
>
> So the error I described is expected?

I don't think so.  Serge?

Eric