Linux Kernel Journey
Apr 30, 2026 · Information Security
Understanding the BPF Loader and Its Signature Schemes
This article provides an in‑depth technical walkthrough of the eBPF loader implementation, explains two signature schemes, details map creation, hash calculation, CO‑RE relocation handling, the use_loader mode, kernel‑side verification via Hornet LSM, and discusses the advantages, limitations, and TOCTOU concerns.
BPF loaderCO-REHornet LSM
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