Messages in this thread | | | Date | Tue, 22 Apr 2014 13:23:12 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE* |
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On Mon, Apr 21, 2014 at 06:53:36PM -0700, Andrew Lutomirski wrote: > On Mon, Apr 21, 2014 at 6:47 PM, H. Peter Anvin <hpa@zytor.com> wrote: > > Race condition (although with x86 being globally ordered, it probably can't actually happen.) The bitmask is probably the way to go. > > Does the race matter? In the worst case you take the lock > unnecessarily. But yes, the bitmask is easy.
I wonder if it would be workable to use a bit in the espfix PGD to denote that it has been initialized already... I hear, near NX there's some room :-)
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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