On 06/07/2018 05:59 PM, Andy Lutomirski wrote:

Can you ask the architecture folks to clarify the situation?  And, if
your notes are indeed correct, don't we need code to handle spurious
faults?

I'll double check that I didn't misunderstand the situation and that it
has not changed on processors with shadow stacks.

But, as far as spurious faults, wouldn't it just be a fault because
we've transiently gone to Present=0?  We already do that when clearing
the Dirty bit, so I'm not sure that's new.  We surely already handle
that one.
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