Messages in this thread | | | Date | Thu, 11 Jul 2013 23:04:52 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH 1/2 v3] x86: introduce int3-based instruction patching |
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On Thu, Jul 11, 2013 at 01:53:16PM -0700, H. Peter Anvin wrote: > Has anyone talked to AMD or VIA about this at all?
I guess I can try to take care of the AMD part. Just to confirm, is this the exact sequence we're interested in:
1. Setup int3 handler for fixup.
2. Put a breakpoint (int3) on the first byte of modifying region, and synchronize code on all CPUs.
3. Modify other bytes of modifying region.
4. Modify the first byte of modifying region, and synchronize code on all CPUs.
5. Clear int3 handler.
If a suitable int3 handler is left permanently in place then the synchronization in step 4 is unnecessary.
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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