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ModelPlex: Verified Runtime Validation of Verified Cyber-Physical System Models

  • Conference paper
Runtime Verification (RV 2014)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 8734))

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Abstract

Formal verification and validation play a crucial role in making cyber-physical systems (CPS) safe. Formal methods make strong guarantees about the system behavior if accurate models of the system can be obtained, including models of the controller and of the physical dynamics. In CPS, models are essential; but any model we could possibly build necessarily deviates from the real world. If the real system fits to the model, its behavior is guaranteed to satisfy the correctness properties verified w.r.t. the model. Otherwise, all bets are off. This paper introduces ModelPlex, a method ensuring that verification results about models apply to CPS implementations. ModelPlex provides correctness guarantees for CPS executions at runtime: it combines offline verification of CPS models with runtime validation of system executions for compliance with the model. ModelPlex ensures that the verification results obtained for the model apply to the actual system runs by monitoring the behavior of the world for compliance with the model, assuming the system dynamics deviation is bounded. If, at some point, the observed behavior no longer complies with the model so that offline verification results no longer apply, ModelPlex initiates provably safe fallback actions. This paper, furthermore, develops a systematic technique to synthesize provably correct monitors automatically from CPS proofs in differential dynamic logic.

This material is based on research sponsored by DARPA under agreement number DARPA FA8750-12-2-0291. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon.

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Authors and Affiliations

  1. Computer Science Department, Carnegie Mellon University, Pittsburgh, PA, 15213, USA

    Stefan Mitsch & André Platzer

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  1. Stefan Mitsch
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  2. André Platzer
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Editors and Affiliations

  1. Department of Computing and Software, McMaster University, 1280 Main Street West, L8S 4L7, Hamilton, ON, Canada

    Borzoo Bonakdarpour

  2. Department of Computer Science, State University of New York at Stony Brook, 1423 Computer Science, 11794-4400, Stony Brook, NY, USA

    Scott A. Smolka

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Mitsch, S., Platzer, A. (2014). ModelPlex: Verified Runtime Validation of Verified Cyber-Physical System Models. In: Bonakdarpour, B., Smolka, S.A. (eds) Runtime Verification. RV 2014. Lecture Notes in Computer Science, vol 8734. Springer, Cham. https://doi.org/10.1007/978-3-319-11164-3_17

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  • DOI: https://doi.org/10.1007/978-3-319-11164-3_17

  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-11163-6

  • Online ISBN: 978-3-319-11164-3

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