linux-kernel - Re: Current state of CLONE

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Message-ID: <m1zlju9u9z.fsf@frodo.ebiederm.org>
Date:	Thu, 20 Nov 2008 09:33:44 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	mtk.manpages@...il.com
Cc:	"Serge Hallyn" <serue@...ibm.com>,
	"Subrata Modak" <subrata@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>, linux-man@...r.kernel.org,
	clg@...ibm.com, herbert@...hfloor.at, dev@...ru
Subject: Re: Current state of CLONE_NEWUSER?

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

> Hi Eric,
>
> On Wed, Nov 19, 2008 at 8:41 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
>> "Michael Kerrisk" <mtk.manpages@...glemail.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
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