lidge-jun/differential-review

Differential Security Review

Security-focused code review for PRs, commits, and diffs.

Core Principles

1. Risk-First: Focus on auth, crypto, value transfer, external calls
2. Evidence-Based: Every finding backed by git history, line numbers, attack scenarios
3. Adaptive: Scale to codebase size (SMALL/MEDIUM/LARGE)
4. Honest: Explicitly state coverage limits and confidence level
5. Output-Driven: Always generate comprehensive markdown report file

---

Rationalizations to Resist

| Rationalization | Why It's Wrong | Required Action | |-----------------|----------------|-----------------| | "Small PR, quick review" | Heartbleed was 2 lines | Classify by risk, not size | | "I know this codebase" | Familiarity breeds blind spots | Build explicit baseline context | | "Git history takes too long" | History reveals regressions | Complete Phase 1 | | "Blast radius is obvious" | Transitive callers get missed | Calculate quantitatively | | "No tests = not my problem" | Missing tests = elevated risk | Flag in report, elevate severity | | "Just a refactor" | Refactors break invariants | Analyze as HIGH until proven LOW | | "I'll explain verbally" | No artifact = findings lost | Write the report |

---

Quick Reference

Codebase Size Strategy

| Codebase Size | Strategy | Approach | |---------------|----------|----------| | SMALL (<20 files) | DEEP | Read all deps, full git blame | | MEDIUM (20-200) | FOCUSED | 1-hop deps, priority files | | LARGE (200+) | SURGICAL | Critical paths only |

Risk Level Triggers

| Risk Level | Triggers | |------------|----------| | HIGH | Auth, crypto, external calls, value transfer, validation removal | | MEDIUM | Business logic, state changes, new public APIs | | LOW | Comments, tests, UI, logging |

---

Workflow Overview

Pre-Analysis → Phase 0: Triage → Phase 1: Code Analysis → Phase 2: Test Coverage
    ↓              ↓                    ↓                        ↓
Phase 3: Blast Radius → Phase 4: Deep Context → Phase 5: Adversarial → Phase 6: Report

---

Decision Tree

Starting a review?

├─ Need detailed phase-by-phase methodology?
│  └─ Read: methodology.md
│     (Pre-Analysis + Phases 0-4: triage, code analysis, test coverage, blast radius)
│
├─ Analyzing HIGH RISK change?
│  └─ Read: adversarial.md
│     (Phase 5: Attacker modeling, exploit scenarios, exploitability rating)
│
├─ Writing the final report?
│  └─ Read: reporting.md
│     (Phase 6: Report structure, templates, formatting guidelines)
│
├─ Looking for specific vulnerability patterns?
│  └─ Read: patterns.md
│     (Regressions, reentrancy, access control, overflow, etc.)
│
└─ Quick triage only?
   └─ Use Quick Reference above, skip detailed docs

---

Quality Checklist

Before delivering:

• [ ] All changed files analyzed
• [ ] Git blame on removed security code
• [ ] Blast radius calculated for HIGH risk
• [ ] Attack scenarios are concrete (not generic)
• [ ] Findings reference specific line numbers + commits
• [ ] Report file generated
• [ ] User notified with summary

---

Integration

audit-context-building skill:

• Pre-Analysis: Build baseline context
• Phase 4: Deep context on HIGH RISK changes

issue-writer skill:

• Transform findings into formal audit reports
• Command: issue-writer --input DIFFERENTIAL_REVIEW_REPORT.md --format audit-report

---

Example Usage

Quick Triage (Small PR)

Input: 5 file PR, 2 HIGH RISK files
Strategy: Use Quick Reference
1. Classify risk level per file (2 HIGH, 3 LOW)
2. Focus on 2 HIGH files only
3. Git blame removed code
4. Generate minimal report
Time: ~30 minutes

Standard Review (Medium Codebase)

Input: 80 files, 12 HIGH RISK changes
Strategy: FOCUSED (see methodology.md)
1. Full workflow on HIGH RISK files
2. Surface scan on MEDIUM
3. Skip LOW risk files
4. Complete report with all sections
Time: ~3-4 hours

Deep Audit (Large, Critical Change)

Input: 450 files, auth system rewrite
Strategy: SURGICAL + audit-context-building
1. Baseline context with audit-context-building
2. Deep analysis on auth changes only
3. Blast radius analysis
4. Adversarial modeling
5. Comprehensive report
Time: ~6-8 hours

---

When NOT to Use This Skill

• Greenfield code (no baseline to compare)
• Documentation-only changes (no security impact)
• Formatting/linting (cosmetic changes)
• User explicitly requests quick summary only (they accept risk)

For these cases, use standard code review instead.

---

Red Flags (Stop and Investigate)

Immediate escalation triggers:

• Removed code from "security", "CVE", or "fix" commits
• Access control modifiers removed (onlyOwner, internal → external)
• Validation removed without replacement
• External calls added without checks
• High blast radius (50+ callers) + HIGH risk change

These patterns require adversarial analysis even in quick triage.

---

Supporting Documentation

• methodology.md - Detailed phase-by-phase workflow (Phases 0-4)
• adversarial.md - Attacker modeling and exploit scenarios (Phase 5)
• reporting.md - Report structure and formatting (Phase 6)
• patterns.md - Common vulnerability patterns reference