Re: Huawei review of different PMP enhancement schemes

John Hauser

Nick Kossifidis wrote:

This is dangerous ! With this revision it's possible to have a region
that's rw by S/U mode and executable by M mode when PL=0, [...]
I agree that would be dangerous, but I intentionally excluded that
possibility, so I don't understand. What is the exact encoding that
you think allows this, when MSL > 0?

when MSL=3 and PL=3 we get removable M-mode-only, non-executable
regions, at the highest security level. In terms of security it's a
regression over revision 0.2, not an improvement.
That detail could easily be changed, if that's the only remaining
complaint about the security.

- John Hauser

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