Symbolic Execution (SE) is a popular and profitable approach to automatic code-based software testing. Concretization and symbolization (C/S) is a crucial part of modern SE tools, since it directly impacts the trade-offs between correctness, completeness and efficiency of the approach. Yet, C/S policies have been barely studied. We intend to remedy to this situation and to establish C/S policies on a firm ground. To this end, we propose a clear separation of concerns between C/S specification on one side, through the new rule-based description language CSml, and the algorithmic core of SE on the other side, revisited to take C/S policies into account. This view is implemented on top of an existing SE tool, demonstrating the feasibility and the benefits of the method. This work paves the way for more flexible SE tools with well-documented and reusable C/S policies, as well as for a systematic study of C/S policies.

When it comes to software analysis, several approaches exist from heuristic techniques to formal methods, which are helpful at solving different kinds ofproblems. Unfortunately very few initiative seek to aggregate this techniques in the same platform. BINSEC intend to fulfill this lack of binary analysis platform by allowing to perform modular analysis. This work focusses on BINSEC/SE, the new dynamic symbolic execution engine (DSE) implemented in BINSEC. We will highlight the novelties of the engine, especially in terms of interactions between concrete and symbolic execution or optimization of formula generation. Finally, two reverse engineering applications are shown in order to emphasize the tool effectiveness.