Re: [rfc] fcntl: Add F_GETOWNER_UIDS option

[Oleg Nesterov <oleg@redhat.com>]

On 03/28, Serge Hallyn wrote:
>
> Quoting Oleg Nesterov (oleg@redhat.com):
> > On 03/28, Serge E. Hallyn wrote:
> > >
> > > If you want to
> > > just add the struct cred to the f_owner and do proper uid conversion,
> > > I'll support that too.  (Just grab a ref to the cred in
> > > fs/fcntl.c:f_modown(), and drop the ref in fs/file_table.c:__fput() ).
> >
> > In this case f_owner.*uid should go away, I guess.
>
> Yup.
>
> Which I guess is all the more reason *not* to do this unless we end up
> not going with Eric's userns mapping patchset (which is unlikely).

Agreed,

> > And sigio_perm()
> > should be unified with kill_ok_by_cred() somehow (modulo
> > security_file_send_sigiotask).
> >
> > Right?
>
> Maybe, but other differences include current being the signal sender in
> one and recipient in the other, and CAP_KILL being relevent in only
> one.

Yes, yes, sure. "current" is meaningless for sigio_perm().

That is why I asked, the "somehow" above is not clear to me.

Oleg.