Valdis.Kletnieks at vt.edu
Sun Oct 16 18:39:24 GMT 2005
On Fri, 14 Oct 2005 17:17:52 +0200, Stephane Grobety said:
> I'm not sure, however, than either of these have much to do with
> the "ring" level at witch the process is running. Modern CPU, after
> all, are designed specifically with a module dedicated to allow
> process to share the same processor while retaining distinct memory
> space: the Memory Manager Unit. Now, I'm not a real expect on that
> thing so, if someone wants to comment on this, I'll be really a happy
> bugger (in particular since I can't seem to find any of my old
> references on the subject any more) :P
Once you get code into whatever the processor architecture has as a "ring 0"
equivalent, it's almost certainly possible to reprogram the MMU any way you
prefer. The MMU can't protect you at that point.
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