linux-kernel - Re: [PATCH v3] powerpc: Do not make the entire heap executable

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Message-ID: <579d983b-6a6b-1a36-3ba6-ed8c6a756c5f@redhat.com>
Date:	Wed, 10 Aug 2016 14:05:04 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org
Cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Kees Cook <keescook@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Florian Weimer <fweimer@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] powerpc: Do not make the entire heap executable



On 08/10/2016 06:36 AM, Michael Ellerman wrote:
> Denys Vlasenko <dvlasenk@...hat.com> writes:
>
>> On 32-bit powerps the ELF PLT sections of binaries (built with --bss-plt,
>> or with a toolchain which defaults to it) look like this:
> ...
>>
>>  arch/powerpc/include/asm/page.h    | 10 +---------
>>  arch/powerpc/include/asm/page_32.h |  2 --
>>  arch/powerpc/include/asm/page_64.h |  4 ----
>>  fs/binfmt_elf.c                    | 34 ++++++++++++++++++++++++++--------
>>  include/linux/mm.h                 |  1 +
>>  mm/mmap.c                          | 20 +++++++++++++++-----
>>  6 files changed, 43 insertions(+), 28 deletions(-)
>
> What tree is this against?

Linus' tree from before August 2.
The "mm: refuse wrapped vm_brk requests" commit collided with my changes
I'll send patch v4 rebased to today's linus tree as soon as I finish testing it.