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

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Date:	Wed, 10 Aug 2016 14:36:51 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Denys Vlasenko <dvlasenk@...hat.com>, linuxppc-dev@...ts.ozlabs.org
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	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

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?

I can't get it to apply to either Linus' tree or linux-next.

cheers

$ patch --dry-run -p1 < diff.diff
checking file arch/powerpc/include/asm/page.h
checking file arch/powerpc/include/asm/page_32.h
checking file arch/powerpc/include/asm/page_64.h
checking file fs/binfmt_elf.c
Hunk #3 FAILED at 613.
Hunk #4 FAILED at 633.
Hunk #5 succeeded at 681 (offset 2 lines).
Hunk #6 succeeded at 889 (offset 2 lines).
Hunk #7 succeeded at 984 (offset 2 lines).
Hunk #8 succeeded at 1003 (offset 2 lines).
2 out of 8 hunks FAILED
checking file include/linux/mm.h
checking file mm/mmap.c
Hunk #1 FAILED at 2653.
Hunk #2 succeeded at 2668 (offset 2 lines).
Hunk #3 succeeded at 2736 (offset 2 lines).
Hunk #4 succeeded at 2750 (offset 2 lines).
1 out of 4 hunks FAILED