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Merge changes from topic "sb/threat-model" into integration

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* changes:
  docs(threat-model): make measured boot out of scope
  docs(threat-model): revamp threat #9
This commit is contained in:
Bipin Ravi 2022-05-19 21:33:32 +02:00 • committed by TrustedFirmware Code Review
commit 453abc80b2
1 changed files with 8 additions and 6 deletions
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14
docs/threat_model/threat_model.rst
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@ -36,6 +36,9 @@ assumptions:
- There is no Secure-EL2. We don't consider threats that may come with - There is no Secure-EL2. We don't consider threats that may come with
Secure-EL2 software. Secure-EL2 software.
- Measured boot is disabled. We do not consider the threats nor the mitigations
that may come with it.
- No experimental features are enabled. We do not consider threats that may come - No experimental features are enabled. We do not consider threats that may come
from them. from them.
@ -617,19 +620,18 @@ each diagram element of the data flow diagram.
| Threat | | **Improperly handled SMC calls can leak register | | Threat | | **Improperly handled SMC calls can leak register |
| | contents** | | | contents** |
| | | | | |
| | | When switching between secure and non-secure | | | | When switching between worlds, TF-A register state |
| | states, register contents of Secure world or | | | can leak to software in different security |
| | register contents of other normal world clients | | | contexts. |
| | can be leaked. |
+------------------------+------------------------------------------------------+ +------------------------+------------------------------------------------------+
| Diagram Elements | DF5 | | Diagram Elements | DF4, DF5 |
+------------------------+------------------------------------------------------+ +------------------------+------------------------------------------------------+
| Affected TF-A | BL31 | | Affected TF-A | BL31 |
| Components | | | Components | |
+------------------------+------------------------------------------------------+ +------------------------+------------------------------------------------------+
| Assets | Sensitive Data | | Assets | Sensitive Data |
+------------------------+------------------------------------------------------+ +------------------------+------------------------------------------------------+
| Threat Agent | NSCode | | Threat Agent | NSCode, SecCode |
+------------------------+------------------------------------------------------+ +------------------------+------------------------------------------------------+
| Threat Type | Information Disclosure | | Threat Type | Information Disclosure |
+------------------------+-------------------+----------------+-----------------+ +------------------------+-------------------+----------------+-----------------+