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Merge "Document expectations of DICE mode" am: ebcdcdbc03 am: ad2adbcb6f

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

Change-Id: I8e8c19288708185fc9f86c8872fcf138ad513892
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Andrew Scull
2023-05-10 02:14:40 +00:00
committed by Automerger Merge Worker
parent 331361212e ad2adbcb6f
commit c71526cd1c
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.