What is BIOS Lock?
Quick note explaining BIOS Lock for BIOS/UEFI and embedded firmware readers.
What is BIOS Lock?
BIOS Lock is a UEFI firmware security concept related to boot trust, variable protection, measurement, or firmware update policy.
Why it matters
- Explains firmware trust and protection mechanisms.
- Helps debug Secure Boot, measured boot, and variable-protection behavior.
- Useful when reviewing boot security policy.
Practical example
Example: Secure Boot decides whether an image is allowed to run; Measured Boot records what actually ran.
Quick checklist
- Which policy or key database is involved?
- Is the image/variable signed or measured as expected?
- Do logs report authentication, measurement, or access-denied errors?
Quick takeaway
BIOS Lock is a small concept, but it often becomes important when reading logs or debugging real firmware.
Related notes
- What is TPM PCR?
- What is SMM Lock?
- What is Secure Boot Keys?
- What is Measured Boot?
- What is Authenticated Variable?
Public references
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