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Date: Wed, 8 Feb 2017 18:14:42 +0530
From: Bhupesh Sharma <bhsharma@...hat.com>
To: Kees Cook <keescook@...omium.org>
Cc: "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Daniel Cashman <dcashman@...gle.com>,
Michael Ellerman <mpe@...erman.id.au>, Bhupesh SHARMA <bhupesh.linux@...il.com>,
Alexander Graf <agraf@...e.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>, Anatolij Gustschin <agust@...x.de>,
Alistair Popple <alistair@...ple.id.au>, Matt Porter <mporter@...nel.crashing.org>,
Vitaly Bordug <vitb@...nel.crashing.org>, Scott Wood <oss@...error.net>,
Kumar Gala <galak@...nel.crashing.org>, Daniel Cashman <dcashman@...roid.com>
Subject: Re: [PATCH v2 1/1] powerpc: mm: support ARCH_MMAP_RND_BITS
On Sat, Feb 4, 2017 at 6:13 AM, Kees Cook <keescook@...omium.org> wrote:
> On Thu, Feb 2, 2017 at 9:11 PM, Bhupesh Sharma <bhsharma@...hat.com> wrote:
>> powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
>> 32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
>> for the mmap base address.
>>
>> This value represents a compromise between increased
>> ASLR effectiveness and avoiding address-space fragmentation.
>> Replace it with a Kconfig option, which is sensibly bounded, so that
>> platform developers may choose where to place this compromise.
>> Keep default values as new minimums.
>>
>> This patch makes sure that now powerpc mmap arch_mmap_rnd() approach
>> is similar to other ARCHs like x86, arm64 and arm.
>>
>> Cc: Alexander Graf <agraf@...e.com>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: Michael Ellerman <mpe@...erman.id.au>
>> Cc: Anatolij Gustschin <agust@...x.de>
>> Cc: Alistair Popple <alistair@...ple.id.au>
>> Cc: Matt Porter <mporter@...nel.crashing.org>
>> Cc: Vitaly Bordug <vitb@...nel.crashing.org>
>> Cc: Scott Wood <oss@...error.net>
>> Cc: Kumar Gala <galak@...nel.crashing.org>
>> Cc: Daniel Cashman <dcashman@...roid.com>
>> Signed-off-by: Bhupesh Sharma <bhsharma@...hat.com>
>> Reviewed-by: Kees Cook <keescook at chromium.org>
>
> This " at " should be "@", but otherwise, yay v2! :)
>
Noted. Sorry for the typo :(
Regards,
Bhupesh
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