The Secure Coding Initiative at CERT has published a new Technical Note CMU/SEI-2009-TN-023 entitled "As-if Infinitely Ranged Integer Model".
Abstract: Integer overflow and wraparound are major causes of software vulnerabilities in the C and C++ programming languages. In this paper we present the as-if infinitely ranged (AIR) integer model, which provides a largely automated mechanism for eliminating integer overflow and integer truncation. The AIR integer model either produces a value equivalent to one that would have been obtained using infinitely ranged integers or results in a runtime constraint violation. Unlike previous integer models, AIR integers do not require precise traps, and consequently do not break or inhibit most existing optimizations. Authors: David Keaton (self) Thomas Plum (Plum Hall Inc.) Robert C. Seacord (SEI/CERT) David Svoboda (SEI/CERT) Alex Volkovitsky (SEI/CERT) Timothy Wilson (SEI/CERT) A PDF Download of this paper is available at: http://www.sei.cmu.edu/publications/documents/09.reports/09tn023.html Source code for the As GCC 4.4.0 and GCC 4.5.0 (svn) prototypes can be downloaded form: http://www.cert.org/secure-coding/integralsecurity.html I would be interested in hearing your opinions on this work, either publically or privately. In particular I am interested in discussing the possibility of implementing this model in GCC. We are continuing work on this project, as described in the report. Thanks, rCs ---- Robert C. Seacord Secure Coding Team Lead CERT / Software Engineering Institute Work: +1 412.268.7608 FAX: +1 412.268.6989
