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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