Exterminator


Exterminator: Automatically correcting memory errors with high probability

Programs written in C and C++ are susceptible to memory errors, including buffer overflows and dangling pointers. These errors, which can lead to crashes, erroneous execution, and security vulnerabilities, are notoriously costly to repair. Tracking down their location in the source code is difficult, even when the full memory state of the program is available. Once the errors are finally found, fixing them remains challenging: even for critical security-sensitive bugs, the average time between initial reports and the issuance of a patch is nearly 1 month.

Exterminator is a system that automatically corrects heap-based memory errors without programmer intervention. Exterminator exploits randomization to pinpoint errors with high precision. From this information, Exterminator derives runtime patches that fix these errors both in current and subsequent executions. In addition, Exterminator enables collaborative bug correction by merging patches generated by multiple users. We present analytical and empirical results that demonstrate Exterminator’s effectiveness at detecting and correcting both injected and real faults.

Exterminator: Automatically Correcting Memory Errors with High Probability, Gene Novark, Emery D. Berger, and Benjamin G. Zorn. Communications of the ACM, Research Highlight.

Exterminator: Automatically Correcting Memory Errors with High Probability, Gene Novark, Emery D. Berger, and Benjamin G. Zorn. PLDI 2007.

This material is based upon work supported by Intel, Microsoft Research, and the National Science Foundation under CAREER Award CNS-0347339 and CNS- 0615211. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.


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