[gruez]

>The USB protocol gives the drive access to all (physical) memory on the machine

Source? Unless you're using something like usb 4 (ie. thunderbolt) usb devices don't have DMA access.

[vlovich123]

Even thunderbolt wouldn’t have arbitrary dma access unless your machine is lacking iommu

[dumbo-octopus]

What about direct DMA access to the memory?

[vlovich123]

IOMMU typically controls access so that the peripheral only has access to memory the OS allows it to have.