linux-kernel - Re: [PATCH v2 0/2] mm: introduce MAP_FIXED

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Message-ID: <876098ictv.fsf@concordia.ellerman.id.au>
Date:   Fri, 15 Dec 2017 20:02:04 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Kees Cook <keescook@...omium.org>, Michal Hocko <mhocko@...nel.org>
Cc:     Linux API <linux-api@...r.kernel.org>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        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>,
        Matthew Wilcox <willy@...radead.org>,
        Abdul Haleem <abdhalee@...ux.vnet.ibm.com>,
        Joel Stanley <joel@....id.au>, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v2 0/2] mm: introduce MAP_FIXED_SAFE

Kees Cook <keescook@...omium.org> writes:

> On Wed, Dec 13, 2017 at 1:25 AM, Michal Hocko <mhocko@...nel.org> wrote:
>>
>> Hi,
>> I am resending with some minor updates based on Michael's review and
>> ask for inclusion. There haven't been any fundamental objections for
>> the RFC [1] nor the previous version [2].  The biggest discussion
>> revolved around the naming. There were many suggestions flowing
>> around MAP_REQUIRED, MAP_EXACT, MAP_FIXED_NOCLOBBER, MAP_AT_ADDR,
>> MAP_FIXED_NOREPLACE etc...
>
> With this named MAP_FIXED_NOREPLACE (the best consensus we've got on a
> name), please consider this series:
>
> Acked-by: Kees Cook <keescook@...omium.org>

I don't feel like I'm actually qualified to ack the mm and binfmt
changes, but everything *looks* correct to me, and you've fixed the flag
numbering such that it can go in mman-common.h as I suggested.

So if the name was MAP_FIXED_NOREPLACE I would also be happy with it.

Acked-by: Michael Ellerman <mpe@...erman.id.au>

I can resubmit with the name changed if that's what it takes.

cheers