On Sun, 31 Aug 2008, Arjan van de Ven wrote:
quoted text
>
> it's probably even a security bug in that I don't see what would be
> stopping a ring 3 user process from executing these instructions...

Well, it could be that Virtual PC raises a #UD exception in the virtual 
machine. In user space, that would just cause the kernel to kill the poor 
innocent victim. But when the kernel gets a #UD exception on what it 
expects to be a nop, it just won't work.

		Linus
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