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Sprint 34 Engineering Log
Program Context
- Phase: Phase 10
- Sprint: Sprint 34
- Status: Completed
- Primary Architecture Layers: Runner isolation, execution trust boundary
Architectural Intent
Transition the Universal Runner to a Firecracker-capable microVM backend with explicit hardware-isolation checks and runtime attestation reporting.
Implementation Detail
Implemented scope:
- Added Firecracker runtime module (
src/pkg/runner/firecracker.py) - Added simulation/native launch modes to support development without host-level Firecracker installation
- Added hardware isolation boundary checks (binary availability, KVM presence policy, seccomp hardening, jailer posture)
- Added microVM runtime attestation report generation bound to execution context
- Integrated Firecracker backend into universal runner execution path (
src/pkg/runner/universal.py) - Added breakout-attempt simulation detection and rejection
- Added unit and QA coverage for Sprint 34 artifacts and behavior
Security and Control Posture
- Phase 4+ policy-driven execution path preserved
- Unified execution fingerprint and ledger pipeline preserved
- Zero-trust OPA and federation trust model unchanged
- Firecracker path enforces fail-closed isolation checks in native mode
QA and Validation Evidence
Validation evidence:
pytest tests/unit/test_firecracker_microvm_runner.pypytest tests/unit/test_universal_edge_runner.pypytest tests/qa/test_sprint34_microvm_transition_qa.py
Risk Register
Primary risk is operational mismatch between simulated and native firecracker environments. Mitigation:
- simulation mode default for deterministic CI/dev behavior
- explicit native-mode precondition checks
- dedicated runbook for host preparation and E2E validation
Forward Linkage
Sprint 35 extends the trust envelope with TPM-backed identity, per-execution ephemeral key derivation, and mutual attestation.
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