linux-kernel - Re: Current state of CLONE

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Date:	Thu, 20 Nov 2008 06:49:54 -0500
From:	"Michael Kerrisk" <mtk.manpages@...glemail.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.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?

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?

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
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