Yes, FireWire is bad in this regard, because it normally allows devices direct DMA to other devices memory space. This is also what makes/made it so popular for

Yes, FireWire is bad in this regard, because it normally allows devices direct DMA to other devices memory space. This is also what makes/made it so popular for high-bandwidth/low-latency applications. But keep in mind that this is something that a host actually has to turn on for every single device on the bus[1], but probably most drivers are lazy and just unconditionally enable this globally. [1] See PhysicalRequestFilter in the OHCI specs http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/ohci_11.pdf http://download.microsoft.com/download/1/6/1/161ba512-40e2-4...