How to fuzz Rust code continuously

Fuzzing, also known as fuzz testing, is an automated technique used to identify bugs and crashes by providing semi-random data inputs to a program, and it is particularly beneficial for improving the stability, quality, and security of software, including Rust code. Despite Rust being a relatively safe language, fuzzing remains essential as it can uncover logical bugs and denial-of-service issues that might lead to security vulnerabilities. Cargo-fuzz is the de-facto standard tool for fuzzing Rust code and acts as a proxy layer to the libFuzzer engine, which is widely used for C/C++ and other languages. The process involves running an instrumented version of the code with a fuzz function that libFuzzer calls in an infinite loop, following a coverage-guided algorithm to explore new code paths. The blog post provides a practical example of using cargo-fuzz, demonstrating how to set up and run fuzz tests, and suggests integrating fuzz testing into GitLab CI/CD pipelines for continuous testing. This approach allows for both blocking and asynchronous fuzz testing sessions, ensuring comprehensive coverage and regression testing in the development workflow.

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