[PATCH v6] powerpc: Do not make the entire heap executable

[Michael Ellerman]

Kees Cook <keescook at chromium.org> writes:

> On Mon, Oct 3, 2016 at 9:13 AM, Denys Vlasenko <dvlasenk at redhat.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 at obsidianresearch.com>
>> Signed-off-by: Denys Vlasenko <dvlasenk at redhat.com>
>> Acked-by: Kees Cook <keescook at chromium.org>
>> Acked-by: Michael Ellerman <mpe at ellerman.id.au>
>> CC: Benjamin Herrenschmidt <benh at kernel.crashing.org>
>> CC: Paul Mackerras <paulus at samba.org>
>> CC: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
>> CC: Kees Cook <keescook at chromium.org>
>> CC: Oleg Nesterov <oleg at redhat.com>
>> CC: Michael Ellerman <mpe at ellerman.id.au>
>> CC: Florian Weimer <fweimer at redhat.com>
>> CC: linux-mm at kvack.org
>> CC: linuxppc-dev at lists.ozlabs.org
>> CC: linux-kernel at vger.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