Re: [Full-disclosure] Firewire Attack on Windows Vista



Is it not possible for Windows (or any OS) to open up DMA for a device
only to a certain range?

If not, what options are available?

I have various forms of RSI and don't feel like typing it again:

On Thu, Mar 06, 2008 at 12:00:09PM -0800, Tim wrote:
[...]
Of course this is not an optimal fix. The drivers should just
automatically restrict the DMA accesses in real time to a range that is
safe but still permits devices to use it. (Presumably to buffers
allocated specifically for I/O.) Not sure if some devices would still
have problems with this, but I think this is the intended operation of
ieee1394 based on the specs and I'd imagine it would work on a greater
number of devices than having it disabled completely.
[...]

So yes, this is possible. AFAIK, driver writers on all sides have just
been lazy. At least with free OSes they have a lame hack to protect
you.

tim



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