Rust at Scale: An Added Layer of Security for WhatsApp
Summary
WhatsApp has adopted Rust to bolster security for media handling, replacing a large C++ component with a memory-safe Rust implementation. The article recounts a 2015 Android Stagefright vulnerability as a wake-up call and explains how a cross-platform Rust library enabled a large-scale deployment across billions of devices, improving runtime performance and memory usage. It also describes the Kaleidoscope checks and WhatsApp's defense-in-depth strategy to minimize attack surface and promote memory-safe languages for new code.