eBPF on Hard Mode
Summary
The article provides a deep, hands-on look at eBPF without libbpf/LLVM, covering program loading, maps, verifier behavior, BTF integration, and callbacks. It includes substantial Zig code examples and discusses practical restrictions for unprivileged users and security considerations. It also explores how to generate and use BTF IDs for subprograms and KFuncs, making it a dense resource for advanced kernel development and security research.