linux-kernel - Re: [PATCH][DOCUMENTATION] The namespaces compatibility list doc

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Message-Id: <20071116084820.cc8ccd19.randy.dunlap@oracle.com>
Date:	Fri, 16 Nov 2007 08:48:20 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Daniel Lezcano <dlezcano@...ibm.com>
Cc:	Pavel Emelyanov <xemul@...nvz.org>, Andrew Morton <akpm@...l.org>,
	Theodore Tso <tytso@....edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cedric Le Goater <clg@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH][DOCUMENTATION] The namespaces compatibility list doc

On Fri, 16 Nov 2007 16:52:34 +0100 Daniel Lezcano wrote:

> > +1. Both the IPC and the PID namespaces provide IDs to address
> > +   object inside the kernel. E.g. semaphore with ipcid or
> > +   process group with pid.
> > +
> > +   In both cases, tasks shouldn't try exposing this id to some
> > +   other task living in a different namespace via a shared filesystem
> > +   or IPC shmem/message. The fact is that this ID is only valid
> > +   within the namespace it was obtained in and may refer to some
> > +   other object in another namespace.
> > +
> > +2. Intentionnaly, two equal user ids in different user namespaces
>        Intentionaly

        Intentionally,

> > +   should not be equal from the VFS point of view. In other
> > +   words, user 10 in one user namespace shouldn't have the same
> > +   access permissions to files, beloging to user 10 in another
>                                     belonging
> > +   namespace. But currently this is not so.
> > +

---
~Randy
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