Subject: Re: [PATCH v6] RO/NX protection for loadable kernel modules

From: Rusty Russell <[email-masked]>
Date: Tue, 22 Sep 2009 09:29:29 +0930

On Fri, 11 Sep 2009 12:20:47 pm Siarhei Liakh wrote:
> +/*
> + * LKM RO/NX protection: protect module's text/ro-data
> + * from modification and any data from execution.
> + */
> +static void set_section_ro_nx(void *base,
> +			unsigned long text_size,
> +			unsigned long ro_size,
> +			unsigned long total_size)
> +{
> +#ifdef CONFIG_X86

This is usually considered a bad idea.  Make a new config option,
CONFIG_HAVE_SET_MEMORY_PROTECTION, select it in arch/x86/Kconfig.
Then wrap the entire functions in one #ifdef CONFIG_HAVE_....
and put empty versions in the #else.

Thanks,
Rusty.