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Safety Transformations: Sound and Complete?

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Computer Safety, Reliability, and Security (SAFECOMP 2013)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 8153))

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Abstract

Safety transformations transform unsafe original software into safe software that, in contrast to the unsafe version, detects if its execution was incorrect due to execution errors. Especially transformations based on arithmetic codes such as an AN- or ANB-code apply complex and error-prone transformations, while at the same time aiming for safety- or mission-critical applications. Testing and error injection are used so far to ensure correctness and error detection capabilities. But both are incomplete and might miss errors that change functionality or reduce error detection rates. Our research provides tools for a complete analysis of AN-encoding safety transformations. This paper presents our analysis tools and results for the AN-encoded operations. While we were able to demonstrate functional correctness, we discovered bugs that prevent propagation of errors almost completely for AN-encoded divisions and reduce propagation significantly for logical bitwise operations.

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Author information

Authors and Affiliations

  1. School of Computer Science, Reykjavík University, Iceland

    Ute Schiffel

Authors
  1. Ute Schiffel
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Editor information

Editors and Affiliations

  1. Thales Transportations Systems GmbH, Lorenzstraße 10, 70435, Stuttgart, Germany

    Friedemann Bitsch

  2. Laboratory of Analysis and Architecture of Systems (LAAS-CNRS), Dependable Computing anf Fault Tolerance Group, University of Toulouse, 7 Avenue du Colonel Roche, 31031, Toulouse, France

    Jérémie Guiochet

  3. Laboratory of Analysis and Architecture of Systems (LAAS-CNRS), Dependable Computing anf Fault Tolerance Group, University of Toulouse, 7 avenue du Colonel Roche, 31031, Toulouse, France

    Mohamed Kaâniche

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Schiffel, U. (2013). Safety Transformations: Sound and Complete?. In: Bitsch, F., Guiochet, J., Kaâniche, M. (eds) Computer Safety, Reliability, and Security. SAFECOMP 2013. Lecture Notes in Computer Science, vol 8153. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40793-2_18

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  • DOI: https://doi.org/10.1007/978-3-642-40793-2_18

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-40792-5

  • Online ISBN: 978-3-642-40793-2

  • eBook Packages: Computer ScienceComputer Science (R0)

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