Re: [rfc] fcntl: Add F_GETOWNER_UIDS option

From: Cyrill Gorcunov
Date: Tue Mar 27 2012 - 12:58:55 EST

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

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

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