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Merge "Document expectations of DICE mode" am: ebcdcdbc03

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Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2583537

Change-Id: I83d72bd6ab9a622e2edc39b463ffad5245845a8c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Andrew Scull
2023-05-10 01:32:09 +00:00
committed by Automerger Merge Worker
parent f29fb96f32 ebcdcdbc03
commit ad2adbcb6f
1 changed files with 18 additions and 0 deletions
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security/rkp/README.md
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@@ -291,6 +291,24 @@ available on the device it should appear in the certificate request as the leaf
of a DKCertChain in AdditionalDKSignatures (see
[CertificateRequest](#certificaterequest)).
#### Mode
The Open Profile for DICE specifies four possible modes with the most important
mode being `normal`. A certificate must only set the mode to `normal` when all
of the following conditions are met when loading and verifying the software
component that is being described by the certificate:
* verified boot with anti-rollback protection is enabled
* only the verified boot authorities for production images are enabled
* debug ports, fuses or other debug facilities are disabled
* device booted software from the normal primary source e.g. internal flash
If any of these conditions are not met then it is recommended to explicitly
acknowledge this fact by using the `debug` mode. The mode should never be `not
configured`.
#### Configuration descriptor
The Open Profile for DICE allows for an arbitrary configuration descriptor. For
BCC entries, this configuration descriptor is a CBOR map with the following
optional fields. If no fields are relevant, an empty map should be encoded.