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The Software Model Checker B LAST

This presentation by Pashootan Vaezipoor from Simon Fraser University introduces BLAST, a software model checker that utilizes Counter-Example Guided Abstraction Refinement (CEGAR) to enhance model checking processes. It discusses the inputs required for model checking, such as program sources and temporal safety properties, and outlines the method's output, including proofs of correctness and counterexamples. The talk examines techniques for memory safety verification and automated test case generation, emphasizing the integration of execution-based and abstraction-based methods to efficiently manage large state spaces.

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The Software Model Checker B LAST

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  1. By D. Beyer et. al. The Software Model Checker BLAST Presentation By: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  2. Introduction • Model Checking is a technique to verify a system desc against a spec • Input: • Program source (system desc) • Temporal safty property (spec) • Output: • Proof of correctness • Counterexample PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  3. CEGAR • The paradigm behind some verification tools: • CounterExample Guided Abstraction Refinement

  4. BLAST • Software Model Checking • Checking Memory Safety • Generating Test PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  5. BLAST (Software Model Checking) • Automatic Software Verification Tools: • Execution-based • Find bugs • Scale the search to large state spaces • Abstraction-based • Proving correctness • Improve precision • But CEGAR combines these two! • Automatic precision adjustment • Keeps the state space small PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  6. BLAST (Memory Safety + Test Case) • Memory Safety • First we use CCURED to mark possible locations • Use Blast to eliminate unreachable error marks • Identify usage scenarios leading to errors • Test Case Generation • We need a spec or a set of coverage goals • Instead of the error path, BLAST creates a test vector • Test vector to the state q that always satisfies p • Test vector to the state q that never satisfies p • Test vector to the state q that smt satisfies p but smt not PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  7. Example PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  8. Example (CFA) PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

  9. PresentationBy: Pashootan Vaezipoor Simon Fraser University (Spring 09)

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