linux-kernel - Re: [PATCH v6] powerpc: Do not make the entire heap executable

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Date:   Tue, 4 Oct 2016 09:54:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Denys Vlasenko <dvlasenk@...hat.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6] powerpc: Do not make the entire heap executable

On Mon, Oct 3, 2016 at 5:18 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> Kees Cook <keescook@...omium.org> writes:
>
>> On Mon, Oct 3, 2016 at 9:13 AM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
>>> On 32-bit powerpc the ELF PLT sections of binaries (built with --bss-plt,
>>> or with a toolchain which defaults to it) look like this:
> ...
>>>
>>> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
>>> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
>>> Acked-by: Kees Cook <keescook@...omium.org>
>>> Acked-by: Michael Ellerman <mpe@...erman.id.au>
>>> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>>> CC: Paul Mackerras <paulus@...ba.org>
>>> CC: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
>>> CC: Kees Cook <keescook@...omium.org>
>>> CC: Oleg Nesterov <oleg@...hat.com>
>>> CC: Michael Ellerman <mpe@...erman.id.au>
>>> CC: Florian Weimer <fweimer@...hat.com>
>>> CC: linux-mm@...ck.org
>>> CC: linuxppc-dev@...ts.ozlabs.org
>>> CC: linux-kernel@...r.kernel.org
>>> ---
>>> Changes since v5:
>>> * made do_brk_flags() error out if any bits other than VM_EXEC are set.
>>>   (Kees Cook: "With this, I'd be happy to Ack.")
>>>   See https://patchwork.ozlabs.org/patch/661595/
>>
>> Excellent, thanks for the v6! Should this go via the ppc tree or the -mm tree?
>
> -mm would be best, given the diffstat I think it's less likely to
>  conflict if it goes via -mm.

Okay, excellent. Andrew, do you have this already in email? I think
you weren't on the explicit CC from the v6...

-Kees

-- 
Kees Cook
Nexus Security