Understanding integer overflow in C/C++
Proceedings of the 34th International Conference on Software Engineering
Improving integer security for systems with KINT
OSDI'12 Proceedings of the 10th USENIX conference on Operating Systems Design and Implementation
Program transformations to fix C integers
Proceedings of the 2013 International Conference on Software Engineering
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Integers represent a growing and underestimated source of vulnerabilities in C and C++ programs. This paper presents the As-if Infinitely Ranged (AIR) Integer model for eliminating vulnerabilities resulting from integer overflow, truncation, and unanticipated wrapping. The AIR Integer model either produces a value equivalent to that obtained using infinitely ranged integers or results in a runtime-constraint violation. With the exception of wrapping (which is optional), this model can be implemented by a C99-conforming compiler and used by the programmer with little or no change to existing source code. Fuzz testing of libraries that have been compiled using a prototype AIR integer compiler has been effective in discovering vulnerabilities in software with low false positive and false negative rates. Furthermore, the runtime overhead of the AIR Integer model is low enough that typical applications can enable it in deployed systems for additional runtime protection.