As-if Infinitely Ranged Integer Model
July 2009 • Technical Note
David Keaton, Thomas Plum (Plum Hall, Inc.), Robert C. Seacord, David Svoboda, Alex Volkovitsky, Timothy Wilson
In this report, the authors present the as-if infinitely ranged (AIR) integer model, which eliminates integer overflow and integer truncation in C and C++ code.
Software Engineering Institute
CMU/SEI Report Number
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.