Avoiding Leakage and Synchronization Attacks through Enclave-Side Preemption Control
| Autor: | Adam Lackorzynski, Francisco Rocha, Paulo Esteves-Verissimo, Vincent Rahli, Marcus Völp, Jérémie Decouchant |
|---|---|
| Přispěvatelé: | Fonds National de la Recherche - FnR [sponsor], SnT – Interdisciplinary Centre for Security, Reliability and Trust [sponsor], SnT – Interdisciplinary Centre for Security, Reliability and Trust [research center] |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Computer science [C05] [Engineering
computing & technology] preemption Computer science Concurrency Preemption Hypervisor Computer security computer.software_genre Sciences informatiques [C05] [Ingénierie informatique & technologie] Software implementation Microarchitecture microkernels SGX-enclaves Confidentiality Information-flow computer |
| Zdroj: | SysTEX@Middleware |
| Popis: | Intel SGX is the latest processor architecture promising secure code execution despite large, complex and hence potentially vulnerable legacy operating systems (OSs). However, two recent works identified vulnerabilities that allow an untrusted management OS to extract secret information from Intel SGX's enclaves, and to violate their integrity by exploiting concurrency bugs. In this work, we re-investigate delayed preemption (DP) in the context of Intel SGX. DP is a mechanism originally proposed for L4-family microkernels as disable-interrupt replacement. Recapitulating earlier results on language-based information-flow security, we illustrate the construction of leakage-free code for enclaves. However, as long as adversaries have fine-grained control over preemption timing, these solutions are impractical from a performance/complexity perspective. To overcome this, we resort to delayed preemption, and sketch a software implementation for hypervisors providing enclaves as well as a hardware extension for systems like SGX. Finally, we illustrate how static analyses for SGX may be extended to check confidentiality of preemption-delaying programs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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