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

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Date:   Fri, 4 Nov 2016 16:03:26 -0600
From:   Kees Cook <keescook@...omium.org>
To:     Denys Vlasenko <dvlasenk@...hat.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.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>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v6] powerpc: Do not make the entire heap executable

Hi,

Jason just reminded me about this patch. :)

Denys, can you resend a v7 with all the Acked/Reviewed/Tested-bys
added and send it To: akpm, with everyone else (and lkml) in CC? That
should be the easiest way for Andrew to pick it up.

Thanks!

-Kees


On Mon, Oct 24, 2016 at 5:17 PM, Kees Cook <keescook@...omium.org> wrote:
> 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



-- 
Kees Cook
Nexus Security