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Safe tasks: run time verification of the RTFM-lang model of computation
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab. (Embedded Systems)ORCID iD: 0000-0002-1791-535X
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.ORCID iD: 0000-0001-5311-1781
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab. (Embedded Systems)
Number of Authors: 32016 (English)In: 2016 IEEE 21st International Conference on Emerging Technologies and Factory Automation (ETFA): Berlin, 6-9 Sept. 2016, Piscataway, NJ: IEEE conference proceedings, 2016, article id 7733550Conference paper, Published paper (Refereed)
Abstract [en]

Embedded systems for critical applications are typicallyspecified with requirements on predictable timing andsafety. While ensuring predictable timing, the RTFM-lang (Real-Time For the Masses) model of computation (MoC) currentlylacks memory access protection among real-time tasks. In thispaper, we discuss how to safely verify task execution given aspecification using the RTFM-MoC. Furthermore, an extensionto the RTFM-core infrastructure is outlined and tested with usecases of embedded development. We propose a method for runtime verification exploiting memory protection hardware. Forthis purpose, we introduce memory resources to the declarativelanguage RTFM-core allowing compliance checks. As a proofof concept, compiler support for model analysis and automaticgeneration of run time verification code is implemented togetherwith an isolation layer for the RTFM-kernel. With this verificationfoundation, functional run time checks as well as furtheroverhead assessments are future research questions.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE conference proceedings, 2016. article id 7733550
Series
I E E E International Conference on Emerging Technologies and Factory Automation. Proceedings, ISSN 1946-0740
National Category
Embedded Systems
Research subject
Embedded System
Identifiers
URN: urn:nbn:se:ltu:diva-59755DOI: 10.1109/ETFA.2016.7733550ISI: 000389524200057Scopus ID: 2-s2.0-84996551916ISBN: 978-1-5090-1314-2 (print)ISBN: 978-1-5090-1313-5 (print)OAI: oai:DiVA.org:ltu-59755DiVA, id: diva2:1037297
Conference
21st International Conference on Emerging Technologies and Factory Automation (ETFA), Berlin, 6-9 Sept 2016
Available from: 2016-10-14 Created: 2016-10-14 Last updated: 2019-02-27Bibliographically approved
In thesis
1. !secure(system) <=?=> !safe(system): On Security and Safety of Industrial Software Systems
Open this publication in new window or tab >>!secure(system) <=?=> !safe(system): On Security and Safety of Industrial Software Systems
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The focus of our research work is on readily accessible, embedded, real-time development with concurrency support. To this end, we develop the Real-Time For the Masses (RTFM) programming framework with a model of computation based on tasks and resources and that stipulates a timing semantics. Typically, hard real-time requirements are a characteristic of safety-critical applications. In contrast to runtime verification, such applications primarily require static assurances concerning safety and security attributes. This thesis discusses the building blocks for a statically analyzable programming paradigm for embedded real-time applications and its implementation. Svenska kraftnät funded the research presented in this thesis and set the scope to industrial automation. Consequently, we also investigate the applicability of our RTFM framework for scheduling and resource management for the runtime environments of industrial applications. We start by reviewing relevant and well-established industry standards to build background knowledge of the state-of-the-art safety and security requirements in software development. Special attention is placed on the IEC 61131 and IEC 61499 standards for industrial software development and their programming and execution model. We show the feasibility of using IEC 61499 as a holistic, distributed, and hierarchical model with mappings from the functional layer (IEC 61499 function block networks) and safety layer (PLCopen safety function blocks) to RTFM. We also demonstrate that our Rust-based RTFM implementation enables static verification for a myriad of safety and security attributes. Moreover, our investigations reveal a mutual dependency of safety and security in the context of software systems. For this reason, we believe and argue that safety and security cannot be considered independent during the design and implementation of safety-critical applications. Upon closer examination, we even conclude that safety and security are equivalent.

 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
embedded systems, hard real-time, concurrency, model of computation, safety-critical, safety, security, industrial automation, RTFM, real-time for the masses
National Category
Embedded Systems
Research subject
Embedded Systems
Identifiers
urn:nbn:se:ltu:diva-73059 (URN)978-91-7790-320-8 (ISBN)978-91-7790-321-5 (ISBN)
Public defence
2019-05-08, A3024, Luleå, 13:00 (English)
Opponent
Supervisors
Available from: 2019-03-01 Created: 2019-02-27 Last updated: 2019-09-26Bibliographically approved

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Lindner, MarcusLindner, AndreasLindgren, Per

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