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Verified Rust Monitors for Lola Specifications

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Runtime Verification (RV 2020)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 12399))

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Abstract

The safety of cyber-physical systems rests on the correctness of their monitoring mechanisms. This is problematic if the specification of the monitor is implemented manually or interpreted by unreliable software. We present a verifying compiler that translates specifications given in the stream-based monitoring language Lola to implementations in Rust. The generated code contains verification annotations that enable the Viper toolkit to automatically prove functional correctness, absence of memory faults, and guaranteed termination. The compiler parallelizes the evaluation of different streams in the monitor based on a dependency analysis of the specification. We present encouraging experimental results obtained with monitor specifications found in the literature. For every specification, our approach was able to either produce a correctness proof or to uncover errors in the specification.

This work was partially supported by the German Research Foundation (DFG) as part of the Collaborative Research Center “Foundations of Perspicuous Software Systems” (TRR 248, 389792660), and by the European Research Council (ERC) Grant OSARES (No. 683300).

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Notes

  1. 1.

    See https://www.rust-lang.org/.

  2. 2.

    See e.g. the verified solution for the Knapsack Problem: https://github.com/viperproject/prusti-dev/blob/master/prusti/tests/verify/pass/rosetta/Knapsack_Problem.rs.

  3. 3.

    On a technical note: Rust ’s type system requires the programmer to guarantee that the global memory will not be dropped until all threads terminate. Thus, the memory needs to be wrapped into an Atomically Reference Counted (Arc) pointer. This has two disadvantages: all accesses to memory require generally slower heap access and the evaluation suffers from the overhead accompanying atomic reference counting.

  4. 4.

    http://www.rtlola.org/.

  5. 5.

    https://github.com/reactive-systems/Lola2RustArtifact.

  6. 6.

    The specification was adapted to be compliant with RTLola: rather than accessing the input with a future offset, the specification used a negative offset of −2.

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Authors and Affiliations

  1. CISPA Helmholtz Center for Information Security, 66123, Saarbrücken, Germany

    Bernd Finkbeiner, Stefan Oswald, Noemi Passing & Maximilian Schwenger

Authors
  1. Bernd Finkbeiner
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  2. Stefan Oswald
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  3. Noemi Passing
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  4. Maximilian Schwenger
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Correspondence to Maximilian Schwenger .

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Editors and Affiliations

  1. University of Southern California, Los Angeles, CA, USA

    Jyotirmoy Deshmukh

  2. AIT Austrian Institute of Technology GmbH, Vienna, Austria

    Dejan Ničković

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Finkbeiner, B., Oswald, S., Passing, N., Schwenger, M. (2020). Verified Rust Monitors for Lola Specifications. In: Deshmukh, J., Ničković, D. (eds) Runtime Verification. RV 2020. Lecture Notes in Computer Science(), vol 12399. Springer, Cham. https://doi.org/10.1007/978-3-030-60508-7_24

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  • DOI: https://doi.org/10.1007/978-3-030-60508-7_24

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