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Re: [PATCH v7 7/7] enable building user namespace with xfs

To: Dwight Engen <dwight.engen@xxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH v7 7/7] enable building user namespace with xfs
From: Ben Myers <bpm@xxxxxxx>
Date: Wed, 31 Jul 2013 08:25:23 -0500
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130731002119.GR13468@dastard>
References: <20130729230709.11033b2d@xxxxxxxxxx> <20130730234021.GR3111@xxxxxxx> <20130731002119.GR13468@dastard>
User-agent: Mutt/1.5.20 (2009-06-14)
Hey,

On Wed, Jul 31, 2013 at 10:21:19AM +1000, Dave Chinner wrote:
> On Tue, Jul 30, 2013 at 06:40:21PM -0500, Ben Myers wrote:
> > On Mon, Jul 29, 2013 at 11:07:09PM -0400, Dwight Engen wrote:
> > > >From e6a9ee0cfa0ed40484f66bc1726dc19de36038b8 Mon Sep 17 00:00:00 2001
> > > From: Dwight Engen <dwight.engen@xxxxxxxxxx>
> > > Date: Tue, 2 Jul 2013 09:52:54 -0400
> > > Subject: [PATCH 7/7] enable building user namespace with xfs
> > > 
> > > Signed-off-by: Dwight Engen <dwight.engen@xxxxxxxxxx>
> > 
> > Was there a patch running around to limit bulkstat to init_user_ns?  Any 
> > other
> > items that needed to be addressed before applying this patch?
> 
> Bulkstat has a capable(CAP_SYS_ADMIN) check and therefore can only be
> executed in the init name space. Similarly, all the open-by-handle
> interfaces have the same capable() checks so they can only be
> executed int he init name space, too.

Gah.  I was under the impression that you could have a process with
CAP_SYS_ADMIN in a namespace other than init_user_ns.

> The only thing I think we still need to address is whether
> xfs_ioc_setattr() should allow users within a namespace to change
> the project ID of a file they otherwise own. That function is
> currently changed to use a inode_owner_or_capable() check and so if
> the uids match inside the namespace the modification is allowed.
> 
> However, right now for project IDs I think we have decided to limit
> manipulations to the init user namespace and not expose project IDs
> inside user namespaces at all. Hence I think that xfs_ioc_setattr()
> needs a further check for this...

Looks like that should be added to patch 3.  Dwight, if you prefer to repost
only patch 3 that's fine.

-Ben

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