linux-kernel - Re: [PATCH v4 0/10] split ET

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Message-ID: <CAGXu5jJTGms38aWJgFerjaAxPLDkXuGAx69ihzUrcWZ0BMbpqg@mail.gmail.com>
Date:	Wed, 4 Mar 2015 13:58:14 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Hector Marco-Gisbert <hecmargi@....es>,
	Ismael Ripoll <iripoll@....es>,
	Russell King <linux@....linux.org.uk>,
	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>,
	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>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	"David A. Long" <dave.long@...aro.org>,
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	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v4 0/10] split ET_DYN ASLR from mmap ASLR

On Wed, Mar 4, 2015 at 1:54 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Kees Cook <keescook@...omium.org> 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.
>
> Ok, this looks really good - for all patches:
>
>    Reviewed-by: Ingo Molnar <mingo@...nel.org>

Great! Thanks for the suggestions and reviews. :)

-Kees

-- 
Kees Cook
Chrome OS Security
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