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From: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
To: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org
Cc: Emese Revfy <re.emese@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
	Josh Triplett <josh@joshtriplett.org>,
	pageexec@freemail.hu, yamada.masahiro@socionext.com,
	minipli@ld-linux.so, linux@armlinux.org.uk,
	catalin.marinas@arm.com, linux@rasmusvillemoes.dk,
	david.brown@linaro.org, benh@kernel.crashing.org,
	tglx@linutronix.de, akpm@linux-foundation.org,
	jlayton@poochiereds.net, sam@ravnborg.org,
	kernel-hardening@lists.openwall.com,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [kernel-hardening] [PATCH v5 1/4] gcc-plugins: Add the initify gcc plugin
Date: Tue, 28 Mar 2017 14:03:24 +1100	[thread overview]
Message-ID: <1a252726-5b0f-1cd9-708e-71844df82386@au1.ibm.com> (raw)
In-Reply-To: <851a0c99-db08-c3a8-f5c6-2e567971e2eb@au1.ibm.com>

On 27/03/17 18:38, Andrew Donnellan wrote:
> On 01/02/17 07:24, Kees Cook wrote:
>> From: Emese Revfy <re.emese@gmail.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?

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@au1.ibm.com  IBM Australia Limited

  parent reply	other threads:[~2017-03-28  3:05 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-31 20:24 [PATCH v5 0/4] Introduce the initify gcc plugin Kees Cook
2017-01-31 20:24 ` [PATCH v5 1/4] gcc-plugins: Add " Kees Cook
2017-03-27  7:38   ` [kernel-hardening] " Andrew Donnellan
2017-03-27 16:14     ` Kees Cook
2017-03-27 19:31       ` Rasmus Villemoes
2017-03-27 19:33         ` Kees Cook
2017-03-28  7:49       ` [kernel-hardening] " Arnd Bergmann
2017-03-28 19:03         ` Kees Cook
2017-03-28 20:31           ` Arnd Bergmann
2017-03-28  3:03     ` Andrew Donnellan [this message]
2017-03-28 19:00       ` Kees Cook
2017-03-29  8:32   ` Arnd Bergmann
2017-03-29  8:56     ` Arnd Bergmann
2017-03-30 11:04       ` Arnd Bergmann
2017-01-31 20:24 ` [PATCH v5 2/4] util: Move type casts into is_kernel_rodata Kees Cook
2017-01-31 20:24 ` [PATCH v5 3/4] initify: Mark functions with the __nocapture attribute Kees Cook
2017-01-31 20:24 ` [PATCH v5 4/4] initify: Mark functions with the __unverified_nocapture attribute Kees Cook

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