Learn how to strengthen the security posture of the barebox bootloader in this 38-minute conference talk from the Linux Foundation's Open Source Summit. Explore comprehensive approaches to hardening bootloader security within verified boot chains, starting with defining the security-critical subset of the verified boot path and applying fuzzing techniques to core logic components. Discover the security implications of various user configurations and examine software hardening measures designed to minimize vulnerabilities. Delve into mechanisms for secure runtime unlocking and understand the formalization of security issue handling processes. Gain valuable insights into both the technical challenges faced when implementing bootloader security and the strategic roadmap for deploying verified boot chains in embedded products while effectively minimizing potential security risks.