linux-kernel - Re: [PATCH v2 2/5] arm64, mm: Move generic mmap layout functions to mm

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Date:   Wed, 10 Apr 2019 11:27:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alexandre Ghiti <alex@...ti.fr>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Paul Burton <paul.burton@...s.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        James Hogan <jhogan@...nel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mips@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH v2 2/5] arm64, mm: Move generic mmap layout functions to mm

On Wed, Apr 10, 2019 at 12:33 AM Alexandre Ghiti <alex@...ti.fr> wrote:
>
> On 04/10/2019 08:59 AM, Christoph Hellwig wrote:
> > On Thu, Apr 04, 2019 at 01:51:25AM -0400, Alexandre Ghiti wrote:
> >> - fix the case where stack randomization should not be taken into
> >>    account.
> > Hmm.  This sounds a bit vague.  It might be better if something
> > considered a fix is split out to a separate patch with a good
> > description.
>
> Ok, I will move this fix in another patch.

Yeah, I think it'd be best to break this into a few (likely small) patches:
- update the compat case in the arm64 code
- fix the "not randomized" case
- move the code to mm/ (line-for-line identical for easy review)

That'll make it much easier to review (at least for me).

Thanks!

-- 
Kees Cook