linux-kernel - Re: [kernel-hardening] [PATCH 0/6] move mmap_area and PIE binaries away from the stack

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Date:   Fri, 2 Jun 2017 21:37:34 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Rik van Riel <riel@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        Ingo Molnar <mingo@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>, mhocko@...e.de,
        Daniel Micay <danielmicay@...il.com>,
        Will Deacon <will.deacon@....com>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>
Subject: Re: [kernel-hardening] [PATCH 0/6] move mmap_area and PIE binaries
 away from the stack

On Fri, Jun 2, 2017 at 8:20 AM,  <riel@...hat.com> wrote:
> There are a few bugs causing the kernel to sometimes map PIE
> binaries and the mmap_area where the stack is supposed to go.
>
> This series fixes them for x86, ARM64, and PPC.
> S390 seems to be ok.
>
> If people are fine with this approach, I can work my way
> through other architectures, too.

Andrew, I'd rather the ELF_ET_DYN_BASE changes not be in -mm yet. I
think it's the wrong approach. Patch 1 (comment update) is fine.
Patches 3 and 4 need some (minor?) adjustments, but the ELF_DYN_BASE
patches need much more thought, IMO (I've sent a separate email about
those.) And please add me to explicit the Cc list for this series.

-Kees

-- 
Kees Cook
Pixel Security