A Deep Dive Into eBPF Program Loader
summary
Loader walks an ELF-like eBPF binary through four phases: discovery, resolution, kernel interaction, and attachment, using libbpf to parse sections, create maps at load time, and patch placeholders with map file descriptors which the verifier translates to kernel pointers. BTF supplies type metadata for verification and portability, verifier logs are returned via bpf() and now visualizable, and program signing remains unresolved with several community proposals pending.
AI-written summary · about
chapters (17)
- 0:00eBPF program loading intro
- 1:25Core objects in loading
- 6:09Source code to kernel objects
- 9:22Compilation and binary structure
- 11:10libbpf role in loading
- 15:09Four steps of translation
- 19:36libbpf data structures
- 21:23Binary parsing in libbpf
- 23:57Resolution and map handling
- 26:07Kernel interaction and loading
- 28:16Program attachment and execution
- 30:04Link management for persistence
- 31:06BTF and type safety
- 33:16Map relocation process
- 38:11Compile once run everywhere
- 39:37Symbol resolution and verifier logs
- 41:02eBPF program signing state
