Foundational end-to-end verification of cyber-physical systems: The VeriPhy pipeline and its Applications

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• Brandon Bohrer (Carnegie Mellon)
• Friday 19 July 2019, 11:00-12:00
• Computer Science, The Sloman Lounge (UG).

If you have a question about this talk, please contact Vincent Rahli.

We first present VeriPhy, a verified pipeline which automatically transforms verified high-level models of safety-critical cyber-physical systems (CPSs) in differential dynamic logic to verified controller executables.

VeriPhy proves that all safety results are preserved end-to-end as it bridges abstraction gaps, including:

1) the gap between mathematical reals in physical models and machine arithmetic in the implementation,

2) the gap between real physics and its differential-equation models, and

3) the gap between nondeterministic controller models and machine code.

VeriPhy reduces CPS safety to the faithfulness of the physical environment, which is checked at runtime by synthesized, verified monitors. We use three provers in this effort: KeYmaera X, HOL4 , and Isabelle. To minimize the trusted base, we cross-verify the KeYmaera X prover core in Isabelle.

We discuss two practical case studies applying VeriPhy to ground robots:

1) the initial study, tested on commodity hardware, uses a robot moving in a simple straight-line pattern,

2) a follow-up study gives a realistic model for general free-range 2D driving by following a series of arcs and was implemented in AirSim’s realistic autonomous driving simulation.

This talk is part of the Theoretical computer science seminar series.

This talk is included in these lists:

• Computer Science Departmental Series
• Computer Science Distinguished Seminars
• Computer Science, The Sloman Lounge (UG)
• Theoretical computer science seminar
• computer sience

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