Papers › Towards a Formally Verified Security Monitor for VM-based Confidential Computing
Towards a Formally Verified Security Monitor for VM-based Confidential Computing
Wojciech Ozga, Guerney D. H. Hunt, Michael V. Le, Elaine R. Palmer, Avraham Shinnar
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Confidential computing is a key technology for isolating high-assurance applications from the large amounts of untrusted code typical in modern systems. Existing confidential computing systems cannot be certified for use in critical applications, like systems controlling critical infrastructure, hardware security modules, or aircraft, as they lack formal verification. This paper presents an approach to formally modeling and proving a security monitor. It introduces a canonical architecture for virtual machine (VM)-based confidential computing systems. It abstracts processor-specific components and identifies a minimal set of hardware primitives required by a trusted security monitor to enforce security guarantees. We demonstrate our methodology and proposed approach with an example from our Rust implementation of the security monitor for RISC-V.
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