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Date: Thu, 2 Feb 2017 23:44:17 +0530
From: Bhupesh Sharma <bhsharma@...hat.com>
To: Balbir Singh <bsingharora@...il.com>
Cc: linuxppc-dev@...ts.ozlabs.org, kernel-hardening@...ts.openwall.com,
Alistair Popple <alistair@...ple.id.au>, Anatolij Gustschin <agust@...x.de>, Kees Cook <keescook@...omium.org>,
Daniel Cashman <dcashman@...roid.com>, Scott Wood <oss@...error.net>,
Paul Mackerras <paulus@...ba.org>, Daniel Cashman <dcashman@...gle.com>,
Bhupesh SHARMA <bhupesh.linux@...il.com>, Alexander Graf <agraf@...e.com>
Subject: Re: [PATCH 1/2] powerpc: mm: support ARCH_MMAP_RND_BITS
HI Balbir,
On Thu, Feb 2, 2017 at 2:41 PM, Balbir Singh <bsingharora@...il.com> wrote:
>> @@ -100,6 +132,8 @@ config PPC
>> select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
>> select HAVE_KPROBES
>> select HAVE_ARCH_KGDB
>> + select HAVE_ARCH_MMAP_RND_BITS
>> + select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
>
> COMPAT is on for ppc64 by default, so we'll end up with COMPAT_BITS same
> as before all the time.
No, actually the 'ARCH_MMAP_RND_COMPAT_BITS' values can be changed
after boot using the '/proc/sys/vm/mmap_rnd_compat_bits' tunable:
http://lxr.free-electrons.com/source/arch/Kconfig#L624
Regards,
Bhupesh
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