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From: Bhupesh Sharma <bhsharma@redhat.com>
To: Balbir Singh <bsingharora@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org,
	kernel-hardening@lists.openwall.com,
	Alistair Popple <alistair@popple.id.au>,
	Anatolij Gustschin <agust@denx.de>,
	Kees Cook <keescook@chromium.org>,
	Daniel Cashman <dcashman@android.com>,
	Scott Wood <oss@buserror.net>, Paul Mackerras <paulus@samba.org>,
	Daniel Cashman <dcashman@google.com>,
	Bhupesh SHARMA <bhupesh.linux@gmail.com>,
	Alexander Graf <agraf@suse.com>
Subject: Re: [PATCH 1/2] powerpc: mm: support ARCH_MMAP_RND_BITS
Date: Thu, 2 Feb 2017 23:44:17 +0530	[thread overview]
Message-ID: <CACi5LpM7s_Z_BuU=NL6Np4L2qoPysLhwcnP_3M24UE_LnFpRRg@mail.gmail.com> (raw)
In-Reply-To: <20170202091136.GC5179@localhost.localdomain>

HI Balbir,

On Thu, Feb 2, 2017 at 2:41 PM, Balbir Singh <bsingharora@gmail.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

WARNING: multiple messages have this Message-ID (diff)
From: Bhupesh Sharma <bhsharma@redhat.com>
To: Balbir Singh <bsingharora@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org,
	kernel-hardening@lists.openwall.com,
	Alistair Popple <alistair@popple.id.au>,
	Anatolij Gustschin <agust@denx.de>,
	Kees Cook <keescook@chromium.org>,
	Daniel Cashman <dcashman@android.com>,
	Scott Wood <oss@buserror.net>, Paul Mackerras <paulus@samba.org>,
	Daniel Cashman <dcashman@google.com>,
	Bhupesh SHARMA <bhupesh.linux@gmail.com>,
	Alexander Graf <agraf@suse.com>
Subject: [kernel-hardening] Re: [PATCH 1/2] powerpc: mm: support ARCH_MMAP_RND_BITS
Date: Thu, 2 Feb 2017 23:44:17 +0530	[thread overview]
Message-ID: <CACi5LpM7s_Z_BuU=NL6Np4L2qoPysLhwcnP_3M24UE_LnFpRRg@mail.gmail.com> (raw)
In-Reply-To: <20170202091136.GC5179@localhost.localdomain>

HI Balbir,

On Thu, Feb 2, 2017 at 2:41 PM, Balbir Singh <bsingharora@gmail.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

  reply	other threads:[~2017-02-02 18:14 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-02  5:42 [PATCH 0/2] RFC: Adjust powerpc ASLR elf randomness Bhupesh Sharma
2017-02-02  5:42 ` [kernel-hardening] " Bhupesh Sharma
2017-02-02  5:42 ` [PATCH 1/2] powerpc: mm: support ARCH_MMAP_RND_BITS Bhupesh Sharma
2017-02-02  5:42   ` [kernel-hardening] " Bhupesh Sharma
2017-02-02  9:11   ` Balbir Singh
2017-02-02  9:11     ` [kernel-hardening] " Balbir Singh
2017-02-02 18:14     ` Bhupesh Sharma [this message]
2017-02-02 18:14       ` Bhupesh Sharma
2017-02-02 10:23   ` Michael Ellerman
2017-02-02 10:23     ` [kernel-hardening] " Michael Ellerman
2017-02-02 12:22     ` Balbir Singh
2017-02-02 12:22       ` [kernel-hardening] " Balbir Singh
2017-02-02 23:59       ` Michael Ellerman
2017-02-08 12:53     ` Bhupesh Sharma
2017-02-08 12:53       ` [kernel-hardening] " Bhupesh Sharma
2017-02-10 11:01       ` Michael Ellerman
2017-02-10 11:11         ` Bhupesh Sharma
2017-02-16  4:49           ` Bhupesh Sharma
2017-02-24  7:32             ` Bhupesh Sharma
2017-02-24  9:53               ` Michael Ellerman
2017-02-24  9:53                 ` Michael Ellerman
2017-02-02 14:25   ` Kees Cook
2017-02-02 14:25     ` [kernel-hardening] " Kees Cook
2017-02-02 18:04     ` Bhupesh Sharma
2017-02-02 18:04       ` [kernel-hardening] " Bhupesh Sharma
2017-02-02  5:42 ` [PATCH 2/2] powerpc: Redefine ELF_ET_DYN_BASE Bhupesh Sharma
2017-02-02  5:42   ` [kernel-hardening] " Bhupesh Sharma
2017-02-02  6:44 ` [PATCH 0/2] RFC: Adjust powerpc ASLR elf randomness Balbir Singh
2017-02-02  6:44   ` [kernel-hardening] " Balbir Singh
2017-02-02 18:21   ` Bhupesh Sharma
2017-02-02 18:21     ` [kernel-hardening] " Bhupesh Sharma
2017-02-02 14:21 ` Kees Cook
2017-02-02 14:21   ` [kernel-hardening] " Kees Cook
2017-02-02 18:08   ` Bhupesh Sharma
2017-02-02 18:08     ` [kernel-hardening] " Bhupesh Sharma
2017-02-02 19:19     ` Kees Cook
2017-02-02 19:19       ` [kernel-hardening] " Kees Cook
2017-02-02 19:43       ` Bhupesh Sharma
2017-02-02 19:43         ` [kernel-hardening] " Bhupesh Sharma

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