{"id":647124,"date":"2020-04-01T15:20:30","date_gmt":"2020-04-01T22:20:30","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&p=647124"},"modified":"2020-04-01T15:20:30","modified_gmt":"2020-04-01T22:20:30","slug":"autarky-closing-controlled-channels-with-self-paging-enclaves","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/autarky-closing-controlled-channels-with-self-paging-enclaves\/","title":{"rendered":"Autarky: Closing controlled channels with self-paging enclaves"},"content":{"rendered":"

As the first widely-deployed secure enclave hardware, Intel SGX shows promise as a practical basis for confidential cloud computing. However, side channels remain SGX’s greatest security weakness. In particular, the “controlled-channel attack” on enclave page faults exploits a longstanding architectural<\/em> side channel and still lacks effective mitigation.<\/p>\n

We propose Autarky<\/em>: a set of minor, backward-compatible modifications to the SGX ISA that hide an enclave’s page
\naccess trace from the host, and give the enclave full control over its page faults. A trusted library OS implements an enclave self-paging policy.<\/p>\n

We prototype Autarky on current SGX hardware and the Graphene library OS, implementing three paging schemes: a fast software oblivious RAM system made practical by leveraging the proposed ISA, a novel page cluster<\/em> abstraction for application-aware secure self-paging, and a rate-limiting paging mechanism for unmodified binaries. Overall, Autarky provides a comprehensive defense for controlled-channel attacks which supports efficient secure demand paging, and adds no overheads in page-fault free execution.<\/p>\n","protected":false},"excerpt":{"rendered":"

As the first widely-deployed secure enclave hardware, Intel SGX shows promise as a practical basis for confidential cloud computing. However, side channels remain SGX’s greatest security weakness. In particular, the “controlled-channel attack” on enclave page faults exploits a longstanding architectural side channel and still lacks effective mitigation. We propose Autarky: a set of minor, backward-compatible 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