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

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Message-ID: <CAGXu5j+uQqgZSv3fyo+_5z7u9CC=2KjtcAiP6bQkzi9ZK6XLww@mail.gmail.com>
Date:   Mon, 24 Oct 2016 16:17:33 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        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 Thu, Oct 20, 2016 at 3:45 PM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
> On Tue, Oct 04, 2016 at 09:54:12AM -0700, Kees Cook wrote:
>> 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...
>
> FWIW (and ping),
>
> Tested-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
>
> On ARM32 (kirkwood) and PPC32 (405)
>
> For reference, here is the patchwork URL:
>
> https://patchwork.ozlabs.org/patch/677753/

Hi Andrew,

Can you pick this up?

Thanks!

-Kees

-- 
Kees Cook
Nexus Security