I'm familiar with DMA attacks, but it's always shocking to see publicly available GPL code that just works against popular and recent versions of windows, OS X

I'm familiar with DMA attacks, but it's always shocking to see publicly available GPL code that just works against popular and recent versions of windows, OS X and linux. UEFI Secure Boot is no help if you signed a 1394 driver : ) Everyone should read the mitigation steps and caveats as appropriate. If you have physical access to an unlocked windows machine, i'd reach for mimikatz. Instant plaintext.