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A verifiable low-level concurrent programming model based on colored Petri nets

Science China(Information Sciences) 2011年第10期54卷 2013-2027页

作者： WANG ShengYuan & DONG Yuan Department of Computer Science and Technology,Tsinghua University,Beijing 100084,China Department of Computer Science and Technology Tsinghua University

Concurrent programs written in a machine-level language are being used in many areas,but the verification of such programs brings various new challenges to the programming language *** of existing contributions on verifying the safety properties of concurrent programs are for high-level languages,specifications,or calculi in the *** to the lack of abstraction at a low level,additional work is needed to extend these methods to machine-level *** paper describes an approach to integrate Petri nets into low-level concurrent programs to form a new programming model (abstract machine).A program in the programming model is a restricted version of colored Petri net,with transitions colored by assembly codes for machine-level threads,and places colored by shared data consisting of memory locations or *** analysis and verification approaches for usual Petri nets can be applied indirectly for such a low-level concurrent program.

关键词： low-level concurrent programs colored Petri nets abstract machine verification

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An Buffer Overflow Automatic Detection Method Based on Operation Semantic

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The Journal of China Universities of Posts and Telecommunications 2005年第3期12卷 63-66页

作者： ZHAO Dong-fan LIU Lei College of Computer Science and Technology Jilin University Changchun 130012 P.R. China

Buffer overflow is the most dangerous attack method that can be exploited. According to the statistics of Computer Emergency Readiness Team （ CERT ）, buffer overflow accounts for 50% of the current software vulnerabilities, and this ratio is going up. Considering a subset of C language, Mini C, this paper presents an abstract machine model that can realire buffer overflow detection, which is based on operation semantic. Thus the research on buffer overflow detection can be built on strict descriptions of operation semantic. Not only the correctness can be assured, but also the system can be realized and extended easily.

关键词： Buffer overflow detection abstract machine program analysis

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