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Informational 16 Bitcoin

test(core): allow joining debuglink task before restarting event loop

TZd9a5a3ce View source ↗
Public commit record

What the developer wrote

Authored by Roman Zeyde

72/100 · Adequate
test(core): allow joining debuglink task before restarting event loop

[no changelog]
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Mentions testing or verification! No meaningful explanatory body
The short version

What changed, and why it matters

This commit changes internal test-only debug code in the Trezor firmware so that the debug communication session can be cleanly shut down between test scenarios. It adds a flag, a mailbox signal, and a timeout-based join to prevent the debug task from getting stuck when the test framework restarts the device's event loop. The production security relevance appears low because the code is wrapped in `if __debug__` and only used during automated UI tests.

Recommended action

No immediate action required for production security. Treat as a test-infrastructure hardening change. If reviewing, verify that `close_session()` is only invoked from trusted test harness code and that setting `_EXIT_FLAG` cannot be triggered by untrusted USB debug traffic in debug builds.

Security signals we found

01

Debug-only code path gated by `if __debug__`

02

Addition of graceful task teardown with timeout to avoid stuck coroutines during test event-loop restart

03

Potential for debug session to ignore an in-flight message when `_EXIT_FLAG` is set

04

Updated UI test fixtures suggest visible behavior change in pin-cancel test flow

Risk score

Why this scored 16/100

Our methodology →
Potential impact 2/30
Exploitability 1/25
Stealth signal 1/15
Affected reach 2/15
Confidence 7/10
Evidence quality 3/5
Human-validated context

Community notes

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The AI analysis stands alone for now. Submit a note if you can add evidence or important context.

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