Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Tue, 28 Mar 2017 12:00:12 -0700
From: Kees Cook <keescook@...omium.org>
To: Andrew Donnellan <andrew.donnellan@....ibm.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Emese Revfy <re.emese@...il.com>, 
	Arnd Bergmann <arnd@...db.de>, Josh Triplett <josh@...htriplett.org>, PaX Team <pageexec@...email.hu>, 
	Masahiro Yamada <yamada.masahiro@...ionext.com>, minipli@...linux.so, 
	Russell King <linux@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, 
	Rasmus Villemoes <linux@...musvillemoes.dk>, David Brown <david.brown@...aro.org>, 
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Andrew Morton <akpm@...ux-foundation.org>, Jeff Layton <jlayton@...chiereds.net>, 
	Sam Ravnborg <sam@...nborg.org>, 
	"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, 
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v5 1/4] gcc-plugins: Add the initify
 gcc plugin

On Mon, Mar 27, 2017 at 8:03 PM, Andrew Donnellan
<andrew.donnellan@....ibm.com> wrote:
> On 27/03/17 18:38, Andrew Donnellan wrote:
>>
>> On 01/02/17 07:24, Kees Cook wrote:
>>>
>>> From: Emese Revfy <re.emese@...il.com>
>>>
>>> The kernel already has a mechanism to free up code and data memory that
>>> is only used during kernel or module initialization.  This plugin will
>>> teach the compiler to find more such code and data that can be freed
>>> after initialization.
>>
>>
>> Currently checking whether we can wire this up for powerpc without too
>> many problems...
>
>
> Added "select HAVE_GCC_PLUGIN_INITIFY_INIT_EXIT if GCC_PLUGINS" to
> arch/powerpc/Kconfig and have successfully compiled and booted a modular and
> non-modular powernv_defconfig, it looks like we handle the .exit sections
> correctly.
>
> Could this be folded in for further testing when you get around to v6, Kees?

Awesome, thanks for testing! I'll get it queued for a v6...

-Kees

-- 
Kees Cook
Pixel Security

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