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docs: document that in future we'll do EV_EVENT_TAG only, no EV_IPL

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Lennart Poettering 2023-10-10 15:51:38 +02:00 committed by Luca Boccassi
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docs/TPM2_PCR_MEASUREMENTS.md
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@ -29,6 +29,16 @@ Currently, four components will issue TPM2 PCR measurements:
A userspace measurement event log in a format close to TCG CEL-JSON is
maintained in `/run/log/systemd/tpm2-measure.log`.
## Measurements Added in Future
We expect that we'll add further PCR extensions in future (both in firmware and
user mode), which also will be documented here. When executed from firmware
mode future additions are expected to be recorded as `EV_EVENT_TAG`
measurements in the event log, in order to make them robustly
recognizable. Measurements currently recorded as `EV_IPL` will continue to be
recorded as `EV_IPL`, for compatibility reasons. However, `EV_IPL` will not be
used for new, additional measurements.
## PCR Measurements Made by `systemd-boot` (UEFI)
### PCS 5, `EV_EVENT_TAG`, "loader.conf"