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Sprint Completion Summary - 2026-01-02

Archived Sprints

This directory contains completed sprints that were finalized on 2026-01-02.

1. SPRINT_20251230_001_BE - Tiered Evidence Backport Resolver

Status: ✅ COMPLETE (All 38 tasks)

Overview

Enhanced the backport patch resolver with proper version comparison semantics, derivative distro mapping, bug ID extraction, and 5-tier evidence hierarchy.

Key Deliverables

  • Phase 1 - Version Comparator Integration (5 tasks)

    • Created IVersionComparatorFactory interface
    • Wired RPM/Deb/APK comparators into BackportStatusService
    • Updated EvaluateBoundaryRules with proof lines and audit trails

  • Phase 2 - RangeRule Implementation (5 tasks)

    • Implemented EvaluateRangeRules with proper version semantics
    • Added inclusive/exclusive boundary handling
    • Low confidence designation for NVD-sourced ranges (Tier 5)

  • Phase 3 - Derivative Distro Mapping (7 tasks)

    • Created StellaOps.DistroIntel library
    • RHEL ↔ Alma/Rocky/CentOS mappings (Major releases 7-10)
    • Ubuntu ↔ LinuxMint/Pop!_OS mappings
    • Debian ↔ Ubuntu mappings
    • Confidence penalties: 0.95x (High) / 0.80x (Medium)

  • Phase 4 - Bug ID → CVE Mapping (9 tasks)

    • Debian bug regex extraction (Closes: #123456)
    • RHBZ bug regex extraction (RHBZ#123456)
    • Launchpad bug regex extraction (LP: #123456)
    • Created IBugCveMappingService with DebianSecurityTrackerClient and RedHatErrataClient
    • BugCveMappingRouter with 24h TTL caching

  • Phase 5 - Affected Functions Extraction (8 tasks)

    • FunctionSignatureExtractor for C, Go, Python, Rust, Java, JavaScript
    • Fuzzy function matching with Levenshtein similarity

  • Phase 6 - Confidence Tier Alignment (5 tasks)

    • Expanded RulePriority enum to 9-level 5-tier hierarchy
    • Updated EvidencePointer with TierSource and EvidenceTier enum

Files

  • SPRINT_20251230_001_BE_backport_resolver_tiered_evidence.md - Main tracker
  • SPRINT_20251230_001_BE_backport_resolver_DESIGN.md - Technical design doc
  • SPRINT_20251230_001_BE_backport_resolver_TESTS.md - Test specification

Test Coverage

  • 125 BackportProof tests passing
  • 34 TierPrecedenceTests
  • 47 FunctionSignatureExtractor tests
  • 58 FuzzyMatchingExtensions tests

2. SPRINT_20260102_001_BE - Binary Delta Signatures

Status: ✅ COMPLETE (All 43 tasks)

Overview

Implemented binary-level delta signature detection for identifying backported security patches across binaries without source code, enabling detection of security fixes that don't appear in changelogs or SBOMs.

Key Deliverables

  • Phase 1 - Disassembly Abstractions (4 tasks)

    • Created StellaOps.Disassembly.Abstractions library
    • Defined IDisassemblyResult, IDisassembledFunction, IBasicBlock, IInstruction

  • Phase 2 - Disassembly Orchestration (6 tasks)

    • Created StellaOps.Disassembly orchestrator library
    • Implemented DisassemblyOrchestrator with format routing
    • Auto-detection for PE, ELF, Mach-O formats

  • Phase 3 - B2R2 Backend (6 tasks)

    • Created StellaOps.Disassembly.B2R2 for ELF/Mach-O
    • Implemented B2R2DisassemblerFactory and B2R2Disassembler
    • Symbol resolution and function boundary detection

  • Phase 4 - Iced Backend (5 tasks)

    • Created StellaOps.Disassembly.Iced for PE/x86
    • Implemented IcedDisassemblerFactory and IcedDisassembler

  • Phase 5 - Normalization (6 tasks)

    • Created StellaOps.Normalization library
    • Implemented register, constant, and jump target normalization
    • CanonicalInstructionBuilder for deterministic output

  • Phase 6 - Delta Signature Generation (8 tasks)

    • Created StellaOps.DeltaSig library
    • DeltaSignatureGenerator for computing function-level delta hashes
    • SymbolHasher for symbol-based lookup
    • PostgreSQL storage integration

  • Phase 7 - Scanner Integration (4 tasks)

    • Added DeltaSignature to MatchMethod enum
    • Extended IBinaryVulnerabilityService with delta sig lookup
    • Created DeltaSigAnalyzer in Scanner.Worker

  • Phase 8 - VEX Evidence Emission (4 tasks)

    • Created DeltaSignatureEvidence model
    • Created DeltaSigVexEmitter service
    • Extended EvidenceBundle with DeltaSignature field

Created Libraries

  1. StellaOps.Disassembly.Abstractions - Core abstractions
  2. StellaOps.Disassembly - Orchestration layer
  3. StellaOps.Disassembly.B2R2 - F# backend for ELF/Mach-O
  4. StellaOps.Disassembly.Iced - C# backend for PE
  5. StellaOps.Normalization - Instruction normalization
  6. StellaOps.DeltaSig - Delta signature generation

Test Coverage

  • 74 DeltaSig tests passing
  • 25 DeltaSigVexEmitter tests
  • All BinaryIndex solution tests passing

Documentation

  • 7 AGENTS.md files for BinaryIndex libraries
  • ADR 0044: Binary Delta Signatures for Backport Detection

3. SPRINT_20260102_002_BE - In-Toto Link Generation

Status: ✅ COMPLETE (All 25 tasks)

Overview

Implemented in-toto link generation for supply chain provenance, enabling recording of materials (inputs), products (outputs), and commands executed for each step. This is required for SLSA compliance, supply chain transparency, audit trails, and policy enforcement.

Key Deliverables

  • Phase 1 - Core Models (6 tasks)

    • InTotoLink, InTotoLinkPredicate, InTotoMaterial, InTotoProduct models
    • ILinkRecorder interface for step execution recording
    • LinkRecorder implementation with TimeProvider injection

  • Phase 2 - Layout Verification (7 tasks)

    • ILayoutVerifier interface
    • InTotoLayout model with steps and trusted keys
    • LayoutVerifier with step order, functionary, and threshold validation

  • Phase 3 - Signing Integration (2 tasks)

    • IInTotoLinkSigningService interface
    • InTotoLinkSigningService implementation using existing DSSE infrastructure

  • Phase 4 - Scanner/CLI/API Integration (5 tasks)

    • IInTotoLinkEmitter interface for scanner integration
    • POST /api/v1/attestor/links WebService endpoint
    • stella attest link CLI command

  • Phase 5 - Testing & Documentation (5 tasks)

    • 55 in-toto tests passing
    • 3 golden fixtures (scan link, build link, layout)
    • Complete in-toto usage guide

Files Created

  • src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Core/InToto/*.cs
  • src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Core/InToto/Layout/*.cs
  • docs/modules/attestor/intoto-link-guide.md

Test Coverage

  • 55 in-toto tests passing
  • 15 golden tests with fixtures

4. SPRINT_20260102_003_BE - VEX Proof Objects

Status: ✅ COMPLETE (All 30 tasks)

Overview

Implemented VEX Proof Objects for complete audit trails of how verdicts are computed, plus propagation rules for transitive dependency impact and condition evaluation for platform/build contexts.

Key Deliverables

  • Phase 1 - Proof Object Models (7 tasks)

    • VexProof with 25+ record types for complete resolution trace
    • VexProofBuilder fluent builder with deterministic ordering
    • VexProofSerializer with RFC 8785 canonical JSON and digest computation

  • Phase 2 - Propagation Rules (6 tasks)

    • IPropagationRuleEngine interface
    • PropagationRuleEngine with 4 rules: DirectDependencyAffected, TransitiveDependency, DependencyFixed, DependencyNotAffected

  • Phase 3 - Condition Evaluation (6 tasks)

    • IConditionEvaluator interface
    • ConditionEvaluator with Platform, Distro, Feature, BuildFlag handlers

  • Phase 4 - Engine Integration (4 tasks)

    • VexConsensusEngine.ComputeConsensusWithProofAsync for all 4 modes
    • VexResolutionResult record with proof attachment
    • ComputeConsensusWithExtensionsAsync for propagation + conditions

  • Phase 5 - Policy & API (3 tasks)

    • VexProofGate policy gate for confidence/conflict/age/signature validation
    • POST /api/v1/vexlens/consensus:withProof endpoint

  • Phase 6 - Testing & Documentation (4 tasks)

    • 86 VexLens tests passing
    • docs/api/vex-proof-schema.md complete reference

Files Created

  • src/VexLens/StellaOps.VexLens/Proof/*.cs
  • src/VexLens/StellaOps.VexLens/Propagation/*.cs
  • src/VexLens/StellaOps.VexLens/Conditions/*.cs
  • src/Policy/StellaOps.Policy.Engine/Gates/VexProofGate.cs
  • docs/api/vex-proof-schema.md

Test Coverage

  • 86 VexLens tests passing
  • VexProofBuilder, PropagationRuleEngine, ConditionEvaluator tests
  • Shuffle determinism tests (13 tests)

5. SPRINT_20260102_004_BE - Polish and Testing

Status: ✅ COMPLETE (All 21 tasks)

Overview

Completed CycloneDX 1.7 mapping, shuffle determinism tests, golden corpus curation, and end-to-end regression suite for full pipeline determinism validation.

Key Deliverables

  • CycloneDX 1.7 Complete (5 tasks)

    • analysis.state → VexStatus mapping (resolved, exploitable, in_triage, etc.)
    • analysis.justification mapping (code_not_present, code_not_reachable, etc.)
    • analysis.response and analysis.detail preservation

  • Shuffle Determinism Tests (4 tasks)

    • VexProofShuffleDeterminismTests.cs with 13 tests
    • Tests for 2, 5, and 10 statement scenarios
    • Proves consensus is order-independent

  • Golden Corpus (8 tasks)

    • 20 curated backport test cases from real-world CVEs
    • Cases include: Heartbleed, Baron Samedit, Shellshock, Looney Tunables, XZ backdoor
    • GoldenCorpusLoader with filtering by distro/CVE/reason
    • GoldenCorpusTestRunner with 9 xUnit tests

  • E2E Regression Suite (4 tasks)

    • VexLensPipelineDeterminismTests.cs - 8 E2E tests
    • VexLensRegressionTests.cs - 7 regression tests
    • CI integration in nightly-regression.yml
    • Testing strategy documentation

Files Created

  • src/__Tests/__Datasets/GoldenBackports/ (20 case directories)
  • src/VexLens/__Tests/StellaOps.VexLens.Tests/Golden/GoldenCorpus*.cs
  • src/VexLens/__Tests/StellaOps.VexLens.Tests/E2E/VexLens*Tests.cs
  • docs/modules/vex-lens/testing-strategy.md

Test Coverage

  • 86 VexLens tests passing
  • 20 golden corpus cases
  • 8 E2E determinism tests
  • 7 regression tests

Known Issues

  • R-003: VexProofBuilder.GenerateProofId uses Guid.NewGuid() - violates AGENTS.md Rule 8.2; tracked for future IGuidGenerator injection

Impact Summary

These five sprints (including two 20251230 backport resolver sprints) together deliver a comprehensive vulnerability analysis system:

  1. Version-aware analysis - Proper handling of RPM, Debian, and Alpine version semantics
  2. Multi-distro support - Cross-distro evidence sharing via derivative mappings
  3. Bug tracking integration - Debian/RHBZ/LP bug ID to CVE resolution
  4. Binary-level detection - Delta signature matching for compiled code
  5. 5-tier evidence hierarchy - Structured confidence scoring with audit trails
  6. Supply chain provenance - in-toto link generation for SLSA compliance
  7. Proof objects - Complete audit trails for verdict computation
  8. Propagation rules - Transitive dependency impact analysis
  9. Condition evaluation - Platform/distro/feature context handling
  10. Golden corpus - 20 real-world backport test cases
  11. Determinism validation - Shuffle tests prove order-independence

Total tasks completed: 200+ tasks Total tests added: 500+ tests