Re: Wiretapping Linux?

[Avi Kivity]

Joerg Pommnitz wrote:
> --- Avi Kivity schrieb:
>   
> > A pci device can read system RAM and other memory-mapped PCI devices 
> > (such as display framebuffers) using DMA. In addition, a pci (but not 
> > pci-express) device can snoop on pci bus traffic to other devices. 
> > Typically, however, hard drive controllers will be integrated into the 
> > chipset so the data is not on the bus.
> >     
>
> Thanks for providing this information. This makes the binary firmware
> required for peripherals even more interesting for security conscious
> people.
>   

Note that some machines have IOMMUs so it may be possible to prevent a 
device from reading main memory, perhaps at a performance cost.

My AMD machine disables the IOMMU on startup.

If you don't trust your hardware there are only two solutions: keep it 
off the net or keep it off.

--
error compiling committee.c: too many arguments to function

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/