Paul Meyer
6603180b38
In commit 29c6d1c125 ("boot: measure select SMBIOS objects
explicitly") we added an explicit SMBIOS measurement in systemd-boot
and systemd-stub, covering cases where firmware doesn't measure SMBIOS
itself. measure_smbios() bailed unless a TPM was present, so it skipped
the measurement on confidential guests that only expose a CC
measurement protocol (e.g. Intel TDX RTMRs).
We can have much higher expectations of the virtual firmware used for
confidential computing, and the firmware is attested, so we can expect
it to always measure SMBIOS in this case. We still do our own
measurement to get a measurement structure similar to that of
non-confidential guests, and as another line of defense.
Signed-off-by: Paul Meyer <katexochen0@gmail.com>
System and Service Manager
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