ddma

A small proof-of-concept for using disk devices for DMA on Windows.

Why

Some native hypervisors (i.e. Hyper-V) allow the guest unvirtualized device access, which means SLAT can be circumvented.

Demo

Modifying Hyper-V at runtime (baremetal - 2004).

Notes

If kernel debugging is enabled, then the demo will bugcheck due to MiShowBadMapper. You can fix this by changing the first byte the function references to 2.

Your HBA may not support 64-bit addressing and thus cannot access higher physical memory.

This PoC also only supports ATA.