Audit and fuzzing of the RF-packet decode -> dispatch -> display/phone paths for
the "crash a node or phone with a crafted packet" surface, beyond the XEdDSA
authenticity work.
Crash fixes (reproduced under AddressSanitizer / UBSan):
- GeoCoord::latLongToUTM/latLongToMGRS read fixed letter tables out of bounds on
extreme latitude_i/longitude_i from a received Position, and narrowed
out-of-range easting/northing doubles to unsigned (float-cast-overflow UB).
Clamp the UTM zone, the easting/northing narrowing, and the band/col/row
indices. Regression: test_geocoord_extreme_coords_no_oob.
- EnvironmentTelemetry/AirQualityTelemetry render attacker floats via
String(float), which on nRF52/RP2040/STM32/portduino formats into a fixed
char[33] (dtostrf) and overflows near FLT_MAX. Clamp the rendered metrics via
UnitConversions::displaySafeFloat (finite + magnitude <= 1e9), unit-tested in
test_type_conversions.
Defense-in-depth + robustness:
- TraceRouteModule::printRoute: fix an snr_back[-1] OOB read (wrong count in the
guard) and stop formatting the INT8_MIN "unknown SNR" sentinel as a dB value.
- WaypointModule/NodeDB: sanitize untrusted strings before the OLED renderer and
the phone-facing ClientNotification (belt-and-suspenders vs PB_VALIDATE_UTF8).
- MeshService::sendToPhone: withhold NODEINFO/WAYPOINT packets whose nested string
won't cleanly decode, protecting strict phone protobuf decoders without
affecting mesh relay.
Tests: new test_fuzz_decode (protobuf decode + UTF-8 sanitizer fuzz) and
test_fuzz_packets (perhapsDecode / module-handler / traceroute / phone-gate fuzz),
all under AddressSanitizer; native-suite-count 25 -> 27. Full suite 515/515 green.
* Clamp position precision on public / known-keys (Compliance)
* Fix review comments: bounds check, all-channel precision clamp, disabled channel guard
* Potential fix for pull request finding
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* Potential fix for pull request finding
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* Refactor position precision comments for clarity and update channel configuration handling in AdminModule
* Potential fix for pull request finding
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---------
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* Fix position precision for direct sends
* Potential fix for pull request finding
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* Clarify zero position precision logging
* Use const channel reference for position precision
* Use C linkage for position precision test entrypoints
---------
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Ben MeadorsandGitHub
