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

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Message-ID: <877f9p55lu.fsf@concordia.ellerman.id.au>
Date:   Tue, 04 Oct 2016 11:18:37 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Denys Vlasenko <dvlasenk@...hat.com>
Cc:     "linuxppc-dev\@lists.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

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.

cheers