Messages in this thread | | | Date | Wed, 23 Jul 2014 17:23:11 +0200 | From | Borislav Petkov <> | Subject | Re: STI architectural question (and lretq -- I'm not even kidding) |
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On Wed, Jul 23, 2014 at 08:12:32AM -0700, Andy Lutomirski wrote: > How are we supposed to survive two machine checks in rapid succession? > The second will fire as soon as the first one is acked, I imagine. > Unless we switch stacks before acking the MCE, the return address of > the first one will be lost.
Oh, that might not fly but in that case the box probably deserves to die anyway.
I was adressing what you said earlier: "But here's the problem: what happens if an NMI or MCE happens between the sti and the lretq? I think an MCE just might be okay -- it's not really recoverable anyway."
An MC Exception can be recoverable and we can recover. The fact that we raise an exception doesn't always mean we die.
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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