I just looked up IO MMUs, which can provide protection for this. Sadly, on Wikipedia, it looks like the hardware support for them is blotchy. http://en.wikiped

I just looked up IO MMUs, which can provide protection for this. Sadly, on Wikipedia, it looks like the hardware support for them is blotchy. http://en.wikipedia.org/wiki/IOMMU_hardware_list http://en.wikipedia.org/wiki/IOMMU_hardware_list Hopefully that'll get better.