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Recent attacks have broken process isolation by exploiting microarchitecturalside channels that allow indirect access to shared microarchitectural state.Enclaves strengthen the process abstraction to restore isolation guarantees.  We propose MI6, an aggressive, speculative out-of-order processor capable ofproviding secure enclaves under a threat model that includes an untrusted OSand an attacker capable of mounting any software attack currently consideredpractical, including control flow speculation attacks. MI6 is inspired bySanctum [16] and extends its isolation guarantee to more realistic memoryhierarchies. It also introduces a purge instruction, which is used only when asecure process is scheduled, and implements it for a complex processormicroarchitecture. We model the performance impact of enclaves in MI6 throughFPGA emulation on AWS F1 FPGAs by running SPEC CINT2006 benchmarks on top of anuntrusted Linux OS. Security comes at the cost of approximately 16.4% averageslowdown for protected programs.

MI6: Secure Enclaves in a Speculative Out-of-Order Processor