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Combined Security and Schedulability Analysis for MILS Real-Time Critical Architectures

Authors Ill-ham Atchadam, Frank Singhoff, Hai Nam Tran, Noura Bouzid, Laurent Lemarchand



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Author Details

Ill-ham Atchadam
  • University of Brest, Lab-STICC, CNRS UMR 6285, France
Frank Singhoff
  • University of Brest, Lab-STICC, CNRS UMR 6285, France
Hai Nam Tran
  • University of Brest, Lab-STICC, CNRS UMR 6285, France
Noura Bouzid
  • University of Brest, Lab-STICC, CNRS UMR 6285, France
Laurent Lemarchand
  • University of Brest, Lab-STICC, CNRS UMR 6285, France

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Ill-ham Atchadam, Frank Singhoff, Hai Nam Tran, Noura Bouzid, and Laurent Lemarchand. Combined Security and Schedulability Analysis for MILS Real-Time Critical Architectures. In 4th International Workshop on Security and Dependability of Critical Embedded Real-Time Systems (CERTS 2019). Open Access Series in Informatics (OASIcs), Volume 73, pp. 1:1-1:12, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2019)
https://doi.org/10.4230/OASIcs.CERTS.2019.1

Abstract

Real-time critical systems have to comply with stringent timing constraints, otherwise, disastrous consequences can occur at runtime. A large effort has been made to propose models and tools to verify timing constraints by schedulability analysis at the early stages of system designs. Fewer efforts have been made on verifying the security properties in these systems despite the fact that sinister consequences can also happen if these properties are compromised. In this article, we investigate how to jointly verify security and timing constraints. We show how to model a security architecture (MILS) and how to verify both timing constraints and security properties. Schedulability is investigated by the mean of scheduling analysis methods implemented into the Cheddar scheduling analyzer. Experiments are conducted to show the impact that improving security has on the schedulability analysis.

Subject Classification

ACM Subject Classification
  • Software and its engineering
  • Computer systems organization → Real-time system architecture
Keywords
  • MILS (Multi Independent Levels of Security)
  • RTCS (Real-Time Critical Systems)
  • Security architecture and models
  • Scheduling analysis
  • Security analysis

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