ROX-30257: implement permission change tracking #157
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This is done via the path_chmod LSM hook. WIP: the old mode is not quite working yet.
This allows us to exercise the trace_path_chmod bpf program on unit tests.
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ovalenti
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Dec 22, 2025
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It seems all good to me !
tests/test_path_chmod.py
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| e = Event(process=process, event_type=EventType.PERMISSION, | ||
| file=test_file, host_path=test_file, mode=mode) | ||
| print(f'Waiting foor event: {e}') |
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Description
This is done via the path_chmod LSM hook, extending the existing event structure to allow for additional, event type specific information to be sent to userspace.
Changes in userspace are relatively straightforward, the received event is translated into a new
ChmodFileDatatype that wraps the more genericBaseFileDataand adds fields specific for permission changes.Fromtraits are implemented for translation between this type and the gRPC protobuf messages.Checklist
Automated testing
If any of these don't apply, please comment below.
Testing Performed
The existing bpf unit test has been extended with a permission change event in order to exercise the new bpf program.
Integration tests have been added for the new permission change events.