David Pascal Monniaux
Host Institution : UJF
Laboratoire : Verimag (CNRS/G INP/UJF)
Appel à projet : Starting (PE6)
Nom du Projet : STATOR- STATic analysis with ORiginal methods
Montant : 1.47 M€
Since the beginning of computing, software has had bugs. If a word processor crashes, consequences are limited. If a networked application has security bugs (e.g. buffer overflows), important information (e.g. financial or medical) can leak. More importantly, today’s planes are flown by computers, voting machines as well medical devices such as infusion pumps are computerized, and surgeries are performed by robots. Clearly, it is in the best interest of society that such software is bug-free. BUGS ARE NOT A FATALITY! Traditionally, software is tested, i.e. run on a limited number of test cases. Yet, testing cannot prove the absence of bugs in untested configurations. Formal methods, producing mathematical proofs of correctness, have long been proposed as a means to give strong assurance on software. They unfortunately had a (not entirely undeserved) reputation for not scaling up to real software. Faster, automated static analysis methods were however produced in the 2000s, which could cope with some specific classes of applications: predicate abstraction, based on decision procedures (e.g. Microsoft’s device driver verifier) and abstract interpretation (e.g. Polyspace and Astrée, for automotive, aerospace etc.). Yet such systems are still unusable on more common programs: they reject some program constructs, they give too many false alarms (about nonexistent problems) and/or they take too much time and memory. In the recent years, I and others proposed techniques combining decision procedures and classical abstract interpretation, so as to decrease false alarms while keeping costs reasonable. These techniques are still in their infancy. The purpose how STATOR is to develop new combination techniques, so as to break the precision/efficiency barrier. Since the only way to see if a technique really works is to implement and try it, STATOR will produce a practical static analysis tool and experiment it on real programs.