The article mentions this issue explicitly. According to http://en.wikipedia.org/wiki/Thunderbolt_(interface)#Security http://en.wikipedia.org/wiki/Thunderbolt

The article mentions this issue explicitly. According to http://en.wikipedia.org/wiki/Thunderbolt_(interface)#Security http://en.wikipedia.org/wiki/Thunderbolt_(interface)#Securit..., Nehalem (and later) CPUs have an IOMMU that let the OS choose which parts of memory to map into the device's address space. In other words, this issue has been dealt with: you don't expose all of your laptop's memory to Thunderbolt devices.