On 15/12/2015 18:02, Hebbal Yacine wrote:
> What I want to do is: when a controlled process is in user mode, i
> change its cpl to 0, force it to execute a code that is injected in the
> VM, set back its cpl to 3 and let it run like if nothing happened

Could you inject an SMI and place your code in the guest firmware's SMM
handler?  What input is needed by this CPL=0 code?

Paolo
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