linux-kernel - Re: [kernel-hardening] [PATCH v1 0/2] Introduce the initify gcc plugin

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Message-ID: <20160628125748.GK31744@leverpostej>
Date:	Tue, 28 Jun 2016 13:57:49 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Emese Revfy <re.emese@...il.com>
Cc:	kernel-hardening@...ts.openwall.com, pageexec@...email.hu,
	spender@...ecurity.net, mmarek@...e.com, keescook@...omium.org,
	linux-kernel@...r.kernel.org, yamada.masahiro@...ionext.com,
	linux-kbuild@...r.kernel.org, minipli@...linux.so,
	linux@...linux.org.uk, catalin.marinas@....com,
	linux@...musvillemoes.dk, david.brown@...aro.org,
	benh@...nel.crashing.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, jlayton@...chiereds.net, arnd@...db.de
Subject: Re: [kernel-hardening] [PATCH v1 0/2] Introduce the initify gcc
 plugin

On Tue, Jun 28, 2016 at 01:34:07PM +0200, Emese Revfy wrote:
> I would like to introduce the initify gcc plugin. 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. It reduces memory usage.
> The initify gcc plugin can be useful for embedded systems.
> 
> It is a CII project supported by the Linux Foundation.
> 
> This plugin is the part of grsecurity/PaX.
> 
> The plugin supports all gcc versions from 4.5 to 6.0.
> 
> I made some changes on top of the PaX version (since March 6.). These are
> the important ones:
>  * move all local strings to init.rodata.str and exit.rodata.str
>    (not just __func__)
>  * report all initified strings and functions
>    (GCC_PLUGIN_INITIFY_VERBOSE config option)
>  * automatically discover init/exit functions and apply the __init or
>    __exit attributes on them
> 
> You can find more about the changes here:
> https://github.com/ephox-gcc-plugins/initify
> 
> This patch set is based on the "Add support for complex gcc plugins that
> don't fit in a single file" patch set (git/kees/linux.git#kspp HEAD:
> e5d4798b284cd192c8b).

I was hoping to give this a spin on arm/arm64, but I couldn't find the
prerequisite branch/tag/commit in that tree:

https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/commit/?id=e5d4798b284cd192c8b

Where should I be looking?

Thanks,
Mark.