Re: Module hiding files controlled by sysfs

[Greg KH <greg@kroah.com>]

On Fri, Aug 12, 2011 at 01:55:03AM +0200, Tonda wrote:
> diff --git a/fs/hidefiles/hidefiles.c b/fs/hidefiles/hidefiles.c

You forgot your Signed-off-by: line and the rest of the changelog
information explaining what this is, why we would want it, and how you
are going to maintain it.

> +static void disable_write_protection(void)
> +{
> +	unsigned long value;
> +	asm volatile("mov %%cr0,%0" : "=r"(value));
> +	value &= (~WRITEABLE);
> +	asm volatile("mov %0,%%cr0" : : "r"(value));
> +}
> +
> +static void enable_write_protection(void)
> +{
> +	unsigned long value;
> +	asm volatile("mov %%cr0,%0" : "=r"(value));
> +	value |= WRITEABLE;
> +	asm volatile ("mov %0,%%cr0" : : "r"(value));
> +}

Fun stuff, you can do nasty things to a system with this...