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

[Andrew Donnellan]

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...

> diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
> index 34a74131a12c..b98b8fdb7aaf 100644
> --- a/arch/x86/lib/Makefile
> +++ b/arch/x86/lib/Makefile
> @@ -29,6 +29,10 @@ lib-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
>  obj-y += msr.o msr-reg.o msr-reg-export.o hweight.o
>
>  ifeq ($(CONFIG_X86_32),y)
> +        CFLAGS_strstr_32.o += $(INITIFY_DISABLE_VERIFIY_NOCAPTURE_FUNCTIONS)
> +        CFLAGS_string_32.o += $(INITIFY_DISABLE_VERIFIY_NOCAPTURE_FUNCTIONS)
> +        CFLAGS_memcpy_32.o += $(INITIFY_DISABLE_VERIFIY_NOCAPTURE_FUNCTIONS)

s/VERIFIY/VERIFY/g here + Makefile.gcc-plugins?


--
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@xxxxxxxxxxx  IBM Australia Limited