But that is *exactly* what is meant by "separation" of R and X.The idea is not to create "custom CPUs" but to have our modification
picked up by major vendors. Clearly there is interest in applying
hardware to solve security issues based on the latest press releases
from AMD that AMD chips include buffer-overflow protection (see
Computer World, January 15, 2004).As Theo said, the AMD buffer overflow "protection" is nothing more than sensible separation of R and X bits per page, fixing a glaring and
Actually it is not "sensible", and it is not separation.
You can have r--, r-x, but you can't have --x.
I have no idea what you mean by it not being "sensible". Most every CPU I have ever seen does this except the x86. Someone apparently thought there was no value in separate R and X bits for the i386 back in the mid-80s. It was a false economy :)
Crispin
-- Crispin Cowan, Ph.D. http://immunix.com/~crispin/ CTO, Immunix http://immunix.com Immunix 7.3 http://www.immunix.com/shop/
