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Comment by wendroid | Hacker News Reader

man dma

  $ man dma
  No manual entry for dma

And the description of how to exploit it

get a better manual

Er, DMA isn't controlled by the TLB using the usual page table for access permissions? If not, PCs are ridiculously broken.

You can read write system memory at addresses that fit in 32bits even when the Kernel has crashed.