Re: [kernel-hardening] [PATCH v5 1/4] gcc-plugins: Add the initify gcc plugin

[Andrew Donnellan]

On 27/03/17 18:38, Andrew Donnellan wrote:
> On 01/02/17 07:24, Kees Cook wrote:
> > From: Emese Revfy <re.emese@xxxxxxxxx>
> >
> > 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@xxxxxxxxxxx  IBM Australia Limited