linux-kernel - Re: Module hiding files controlled by sysfs

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Message-ID: <20110813020008.GA15554@kroah.com>
Date:	Fri, 12 Aug 2011 19:00:08 -0700
From:	Greg KH <greg@...ah.com>
To:	Tonda <as@...milov.cz>
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Module hiding files controlled by sysfs

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...

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