[Xen-devel] [BUG] Xen failed to emulate lfence instruction

[Mathieu Tarral <mathieu.tarral@xxxxxxxxxxxxxx>]

Hi !

While working on a VMI app that is supposed to intercepted a specific process,
and set a breakpoint on NtResumeThread in Windows, i got a BSOD.

Analyzing this BSOD with windbg reveals that I was in this location:

    FAULTING_IP: 
    nt!PsLookupThreadByThreadId+82
    fffff800`02bcc642 0faee8          lfence


And the error code is an illegal instruction.

Also, i can confirm that i was trying to emulate this instruction, since i was
inside my libvmi event callback where i instructed to
VMI_EVENT_RESPONSE_EMULATE.

I opened an issue on my Github repo:
https://github.com/Wenzel/r2vmi/issues/11

-> could it be possible that the Xen emulator failed on lfence, even though
it's a quite common instruction ?

Platform: Ubuntu 16.04 LTS (Xen 4.6)

Thanks !

​--
Mathieu Tarral

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