linux-kernel - Re: Current state of CLONE

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Date:	Wed, 19 Nov 2008 17:41:21 -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 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
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