lowRISC / lowRISC/opentitan

[rom_ext] Audit boot_svc for boot loops

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SW:ROM_EXT
Dominant language
SystemVerilog
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Description

### Description

Examine flows through the boot_svc code for boot-loop situations.

Example: if one prepares a boot_svc message with a valid `identifier` and an invalid `digest` field, boot_svc will return an error, shutdown, reboot and re-evaluate the still invalid message.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing the boot_svc flows involved when a message has a valid identifier and invalid digest. Determine where the error, shutdown, reboot, and message re-evaluation occur; done means invalid input no longer causes an unintended boot loop, with regression coverage for this scenario.

Written by the indexing model from the issue text.

Assessment

Domain
embedded-iot, security
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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