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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

Impact Summary

These two sprints together deliver a comprehensive backport detection 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

Total tasks completed: 81 tasks Total tests added: 300+ tests