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Message-ID: <CACi5LpM7s_Z_BuU=NL6Np4L2qoPysLhwcnP_3M24UE_LnFpRRg@mail.gmail.com> 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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