linux-kernel - Re: [rfc] fcntl: Add F_GETOWNER

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Date:	Tue, 27 Mar 2012 20:58:53 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>
Subject: Re: [rfc] fcntl: Add F_GETOWNER_UIDS option

On Tue, Mar 27, 2012 at 05:25:34PM +0200, Oleg Nesterov wrote:
> user_ns_map_uid() should translate uid_t from one namespace to another,
> in this case the namespace is the same.
> 
> user_ns_map_uid(cred->user_ns, cred) must be the identical mapping,
> no matter how we change the implementation.
> 
> What I think you need is
> user_ns_map_uid(current_user_ns(), filp->f_owner.cred), the only
> problem is that f_owner.cred doesn't exist.
> 

Hmm, I was confused by likely() in user_ns_map_uid. But indeed, I think
you're so right. Is there some reason why we can't carry f_owner.cred
pointer?

> > Or I miss something
> > in general?
> 
> Or me. Add Serge, may be I missed something.
> 
> Oleg.
> 

	Cyrill
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