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Documents authored by Silver, Lucas

Document
DOI: 10.4230/LIPIcs.ECOOP.2023.29
Semantics for Noninterference with Interaction Trees

Authors: Lucas Silver, Paul He, Ethan Cecchetti, Andrew K. Hirsch, and Steve Zdancewic

Published in: LIPIcs, Volume 263, 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
Noninterference is the strong information-security property that a program does not leak secrets through publicly-visible behavior. In the presence of effects such as nontermination, state, and exceptions, reasoning about noninterference quickly becomes subtle. We advocate using interaction trees (ITrees) to provide compositional mechanized proofs of noninterference for multi-language, effectful, nonterminating programs, while retaining executability of the semantics. We develop important foundations for security analysis with ITrees: two indistinguishability relations, leading to two standard notions of noninterference with adversaries of different strength, along with metatheory libraries for reasoning about each. We demonstrate the utility of our results using a simple imperative language with embedded assembly, along with a compiler into that assembly language.
Cite as

Lucas Silver, Paul He, Ethan Cecchetti, Andrew K. Hirsch, and Steve Zdancewic. Semantics for Noninterference with Interaction Trees. In 37th European Conference on Object-Oriented Programming (ECOOP 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 263, pp. 29:1-29:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{silver_et_al:LIPIcs.ECOOP.2023.29,
  author =	{Silver, Lucas and He, Paul and Cecchetti, Ethan and Hirsch, Andrew K. and Zdancewic, Steve},
  title =	{{Semantics for Noninterference with Interaction Trees}},
  booktitle =	{37th European Conference on Object-Oriented Programming (ECOOP 2023)},
  pages =	{29:1--29:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-281-5},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{263},
  editor =	{Ali, Karim and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2023.29},
  URN =		{urn:nbn:de:0030-drops-182227},
  doi =		{10.4230/LIPIcs.ECOOP.2023.29},
  annote =	{Keywords: verification, information-flow, denotational semantics, monads}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2023.30
Interaction Tree Specifications: A Framework for Specifying Recursive, Effectful Computations That Supports Auto-Active Verification

Authors: Lucas Silver, Eddy Westbrook, Matthew Yacavone, and Ryan Scott

Published in: LIPIcs, Volume 263, 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
This paper presents a specification framework for monadic, recursive, interactive programs that supports auto-active verification, an approach that combines user-provided guidance with automatic verification techniques. This verification tool is designed to have the flexibility of a manual approach to verification along with the usability benefits of automatic approaches. We accomplish this by augmenting Interaction Trees, a Coq datastructure for representing effectful computations, with logical quantifier events. We show that this yields a language of specifications that are easy to understand, automatable, and are powerful enough to handle properties that involve non-termination. Our framework is implemented as a library in Coq. We demonstrate the effectiveness of this framework by verifying real, low-level code.
Cite as

Lucas Silver, Eddy Westbrook, Matthew Yacavone, and Ryan Scott. Interaction Tree Specifications: A Framework for Specifying Recursive, Effectful Computations That Supports Auto-Active Verification. In 37th European Conference on Object-Oriented Programming (ECOOP 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 263, pp. 30:1-30:26, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{silver_et_al:LIPIcs.ECOOP.2023.30,
  author =	{Silver, Lucas and Westbrook, Eddy and Yacavone, Matthew and Scott, Ryan},
  title =	{{Interaction Tree Specifications: A Framework for Specifying Recursive, Effectful Computations That Supports Auto-Active Verification}},
  booktitle =	{37th European Conference on Object-Oriented Programming (ECOOP 2023)},
  pages =	{30:1--30:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-281-5},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{263},
  editor =	{Ali, Karim and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2023.30},
  URN =		{urn:nbn:de:0030-drops-182239},
  doi =		{10.4230/LIPIcs.ECOOP.2023.30},
  annote =	{Keywords: coinduction, specification, verification, monads}
}
Document
Artifact
DOI: 10.4230/DARTS.9.2.6
Semantics for Noninterference with Interaction Trees (Artifact)

Authors: Lucas Silver, Paul He, Ethan Cecchetti, Andrew K. Hirsch, and Steve Zdancewic

Published in: DARTS, Volume 9, Issue 2, Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
Noninterference is the strong information-security property that a program does not leak secrets through publicly-visible behavior. In the presence of effects such as nontermination, state, and exceptions, reasoning about noninterference quickly becomes subtle. We advocate using interaction trees (ITrees) to provide compositional mechanized proofs of noninterference for multi-language, effectful, nonterminating programs, while retaining executability of the semantics. We develop important foundations for security analysis with ITrees: two indistinguishability relations, leading to two standard notions of noninterference with adversaries of different strength, along with metatheory libraries for reasoning about each. We demonstrate the utility of our results using a simple imperative language with embedded assembly, along with a compiler into that assembly language.
Cite as

Lucas Silver, Paul He, Ethan Cecchetti, Andrew K. Hirsch, and Steve Zdancewic. Semantics for Noninterference with Interaction Trees (Artifact). In Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023). Dagstuhl Artifacts Series (DARTS), Volume 9, Issue 2, pp. 6:1-6:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@Article{silver_et_al:DARTS.9.2.6,
  author =	{Silver, Lucas and He, Paul and Cecchetti, Ethan and Hirsch, Andrew K. and Zdancewic, Steve},
  title =	{{Semantics for Noninterference with Interaction Trees (Artifact)}},
  pages =	{6:1--6:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2023},
  volume =	{9},
  number =	{2},
  editor =	{Silver, Lucas and He, Paul and Cecchetti, Ethan and Hirsch, Andrew K. and Zdancewic, Steve},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.9.2.6},
  URN =		{urn:nbn:de:0030-drops-182465},
  doi =		{10.4230/DARTS.9.2.6},
  annote =	{Keywords: verification, information-flow, denotational semantics, monads}
}
Document
Artifact
DOI: 10.4230/DARTS.9.2.8
Interaction Tree Specifications: A Framework for Specifying Recursive, Effectful Computations That Supports Auto-Active Verification (Artifact)

Authors: Lucas Silver, Eddy Westbrook, Matthew Yacavone, and Ryan Scott

Published in: DARTS, Volume 9, Issue 2, Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
This paper presents a specification framework for monadic, recursive, interactive programs that supports auto-active verification, an approach that combines user-provided guidance with automatic verification techniques. This verification tool is designed to have the flexibility of a manual approach to verification along with the usability benefits of automatic approaches. We accomplish this by augmenting Interaction Trees, a Coq datastructure for representing effectful computations, with logical quantifier events. We show that this yields a language of specifications that are easy to understand, automatable, and are powerful enough to handle properties that involve non-termination. Our framework is implemented as a library in Coq. We demonstrate the effectiveness of this framework by verifying real, low-level code.
Cite as

Lucas Silver, Eddy Westbrook, Matthew Yacavone, and Ryan Scott. Interaction Tree Specifications: A Framework for Specifying Recursive, Effectful Computations That Supports Auto-Active Verification (Artifact). In Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023). Dagstuhl Artifacts Series (DARTS), Volume 9, Issue 2, pp. 8:1-8:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

Copy BibTex To Clipboard

@Article{silver_et_al:DARTS.9.2.8,
  author =	{Silver, Lucas and Westbrook, Eddy and Yacavone, Matthew and Scott, Ryan},
  title =	{{Interaction Tree Specifications: A Framework for Specifying Recursive, Effectful Computations That Supports Auto-Active Verification (Artifact)}},
  pages =	{8:1--8:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2023},
  volume =	{9},
  number =	{2},
  editor =	{Silver, Lucas and Westbrook, Eddy and Yacavone, Matthew and Scott, Ryan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.9.2.8},
  URN =		{urn:nbn:de:0030-drops-182485},
  doi =		{10.4230/DARTS.9.2.8},
  annote =	{Keywords: coinduction, specification, verification, monads}
}
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