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

Mark Rutland
2016-06-28T12:57:57Z

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.