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SubjectRe: Misc Fixes
Hi, 

On Fri, 12 Jul 96 23:55:24 EST, tornaria@cmat.edu.uy (Gonzalo
Tornaria) said:

> Would it be too bad tu run some parts of the kernel (at least
> modules, perhaps compiled in drivers too) in protection ring 1? Then
> you leave ring 0 for secure compiled-in parts of the kernel. You
> can't modify page tables from ring 1, can you? You put securelevel
> (and perhaps some other things) in a read-only page, and as modules
> are running in ring 1, they can't write to it.

Not all architectures implement such multiple security levels in
hardware. You can't rely on it being available.

Cheers,
Stephen.
--
Stephen Tweedie <sct@dcs.ed.ac.uk>
Department of Computer Science, Edinburgh University, Scotland.


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