linux-kernel - Re: [PATCH] paravirt.h

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Message-Id: <1156254322.2976.55.camel@laptopd505.fenrus.org>
Date:	Tue, 22 Aug 2006 15:45:22 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@....de>,
	Andrew Morton <akpm@...l.org>,
	virtualization <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH] paravirt.h

On Tue, 2006-08-22 at 14:56 +0100, Alan Cox wrote:
> Ar Iau, 2006-08-10 am 11:06 -0700, ysgrifennodd Jeremy Fitzhardinge:
> > Rusty Russell wrote:
> > > +EXPORT_SYMBOL_GPL(paravirt_ops);
> > >   
> > This should probably be EXPORT_SYMBOL(), otherwise pretty much every 
> > driver module will need to be GPL...
> 
> It would be nice not to export it at all or to protect it, paravirt_ops
> is a rootkit authors dream ticket. I'm opposed to paravirt_ops until it
> is properly protected, its an unpleasantly large security target if not.
> 
> It would be a lot safer if we could have the struct paravirt_ops in
> protected read-only const memory space, set it up in the core kernel
> early on in boot when we play "guess todays hypervisor" and then make
> sure it stays in read only (even to kernel) space.

this would need a "const after boot" section; which is really not hard
to make and probably useful for a lot more things.... todo++


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com

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