Re: [PATCH] paravirt.h

From: Arjan van de Ven
Date: Tue Aug 22 2006 - 09:43:19 EST

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)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at