linux-kernel - Re: [PATCH 0/2] mm: introduce MAP_FIXED

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Message-ID: <CAGXu5jKxgkar3802JYUqrVF==h99hDH9UUdZSgH9T_-n9y22EA@mail.gmail.com>
Date:   Wed, 29 Nov 2017 14:12:45 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Linux API <linux-api@...r.kernel.org>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Florian Weimer <fweimer@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Abdul Haleem <abdhalee@...ux.vnet.ibm.com>,
        Joel Stanley <joel@....id.au>, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 0/2] mm: introduce MAP_FIXED_SAFE

On Wed, Nov 29, 2017 at 6:42 AM, Michal Hocko <mhocko@...nel.org> wrote:
> Except we won't export expose the new semantic to the userspace at all.

I'm confused: the changes in patch 1 are explicitly adding
MAP_FIXED_SAFE to the uapi. If it's not supposed to be exposed,
shouldn't it go somewhere else?

-Kees

-- 
Kees Cook
Pixel Security