EC2’s formally verified “isolation engine” provides mathematical assurance of virtual-machine isolation
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Formally verified VM isolation on EC2 is a major technical achievement with strategic implications for cloud security.
Summary
AWS has deployed the first formally verified hypervisor in a commercial cloud, the Nitro Isolation Engine, on Graviton5-powered M9g/M9d instances. The engine is a separation kernel coded in a restricted Rust subset (μRust) and verified with 330,000 lines of Isabelle/HOL proofs, matching seL4's scale. Formal verification covers confidentiality, integrity, functional correctness, memory safety, and runtime-error absence using Separation Logic and weakest-precondition calculus via the open-sourced AutoCorrode library.