A bug in macOS’s TCP stack causes networking to fail after about 49.7 days of uptime. A 32-bit timer overflow freezes the TCP clock, preventing cleanup of closed connections and eventually exhausting ephemeral ports.
Booting into Trust: Reverse Engineering macOS Secure Boot Internals
The article analyzes the macOS secure boot chain on Apple Silicon, showing how Boot ROM, cryptographic verification, Secure Enclave, and staged bootloaders create a hardware-anchored chain-of-trust that protects the OS from power-on to kernel startup.