Re: [rfc] fcntl: Add F_GETOWNER_UIDS option

[Serge Hallyn]

Quoting Oleg Nesterov (oleg@xxxxxxxxxx):
> 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).

> 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.

-serge
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