Re: Current state of CLONE_NEWUSER?

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

"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.

Eric