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Date: Wed, 16 Nov 2016 12:09:16 -0500
From: Rik van Riel <riel@...hat.com>
To: kernel-hardening@...ts.openwall.com
Cc: Peter Zijlstra <peterz@...radead.org>, Will Deacon
 <will.deacon@....com>,
        Greg KH <gregkh@...uxfoundation.org>,
        David Windsor
 <dave@...gbits.org>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Arnd
 Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar
 <mingo@...hat.com>,
        "H. Peter Anvin" <h.peter.anvin@...el.com>
Subject: Re: Re: [RFC v4 PATCH 00/13] HARDENED_ATOMIC

On Tue, 2016-11-15 at 09:23 -0800, Kees Cook wrote:
> On Tue, Nov 15, 2016 at 8:50 AM, Rik van Riel <riel@...hat.com>
> wrote:
> > 
> > On Mon, 2016-11-14 at 12:31 -0800, Kees Cook wrote:
> > > 
> > > Keeping the implementation details of refcount_t and stats_t
> > > opaque
> > > to
> > > the users should discourage misuse...
> > 
> > I suspect a lack of inc_not_zero and dec_and_test would
> > be the biggest things discouraging misuse of stats_t
> > for reference counting :)
> 
> Right, but it's the continuing atomic_t use that concerns me...

Can we remove inc_not_zero and dec_and_test functionality
from the atomic_t macros?

It would require fixing all of the in tree code, and after
that people with out of tree code would have to switch to
refcount_t to make their code work again.

-- 
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