linux-kernel - Re: [PATCH v3 0/10] split ET

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Message-ID: <CAGXu5jK=bEQDao+QZN7AZuVi0FB_+AsT4LAPodVZg3VTK=Pi-A@mail.gmail.com>
Date:	Mon, 9 Mar 2015 11:06:00 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Hector Marco-Gisbert <hecmargi@....es>,
	Ismael Ripoll <iripoll@....es>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, "x86@...nel.org" <x86@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	"David A. Long" <dave.long@...aro.org>,
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	Yann Droneaud <ydroneaud@...eya.com>,
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	Jan-Simon Möller <dl9pf@....de>,
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	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3 0/10] split ET_DYN ASLR from mmap ASLR

On Mon, Mar 9, 2015 at 9:19 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Tue, Mar 03, 2015 at 06:10:15PM -0800, Kees Cook wrote:
>> To address the "offset2lib" ASLR weakness[1], this separates ET_DYN
>> ASLR from mmap ASLR, as already done on s390. The architectures
>> that are already randomizing mmap (arm, arm64, mips, powerpc, s390,
>> and x86), have their various forms of arch_mmap_rnd() made available
>> via the new CONFIG_ARCH_HAS_ELF_RANDOMIZE. For these architectures,
>> arch_randomize_brk() is collapsed as well.
>>
>> This is an alternative to the solutions in:
>> https://lkml.org/lkml/2015/2/23/442
>>
>> I've been able to test x86 and arm, and the buildbot (so far) seems
>> happy with building the rest.
>
> Hmm, do you want to wrap my acks up to your previous one into this set?
> What about my tested-by?
>
> I'd rather not waste time testing this version if my previous test is
> still valid (or if there's yet another version of this patch set which
> is later than this set.)
>
> Unless I hear anything, I'll assume that it's broadly the same as the
> previous patch set and requires no action.

Yeah, it's broadly the same. I tweaked a few minor things, so I'm
comfortable retaining the acks and tested-bys. Thank you for the
reviews and tests!

-Kees

-- 
Kees Cook
Chrome OS Security
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