Casey Smalley developed a targeted security hardening feature for the google/swiftshader repository, focusing on ARM architecture. He implemented conditional enablement of ARM Control Flow Integrity using BTI and PAC-RET, ensuring enhanced code flow protection with minimal impact on existing build processes. By updating the build system configuration in GN, Casey aligned the project with Chromium’s security standards and laid the groundwork for future Guarded Control Stack integration. His work consolidated the approach to ARM security across the repository, providing a maintainable path for future audits and improvements while preserving compatibility with current configurations and workflows.