systemd v262 addresses TPM PCR scarcity by introducing NvPCRs—PCR-like registers allocated in the TPM's NV memory—with a reworked anchoring design. The article provides a hands-on deep dive into rebuilding systemd NvPCRs from scratch against a software TPM, explaining the security rationale behind the design. This extends systemd's TPM-based security features like passwordless disk encryption and remote attestation beyond the limited 8 usable standard PCRs.
Background
systemd is the dominant init system and system manager for Linux, providing core OS functionality including boot management, service orchestration, and security features. TPM (Trusted Platform Module) is a hardware security chip used for secure boot, disk encryption, and remote attestation.
- Source
- Lobsters
- Published
- Sep 25, 2026 at 04:26 PM
- Score
- 6.0 / 10