# Security Audit Preparation Checklist - scirs2-core 1.0

## Overview

This document provides a comprehensive checklist and preparation guide for third-party security audits of scirs2-core. It outlines all security-critical components, potential attack vectors, and areas that require specialized review.

## Audit Scope

### In-Scope Components

#### Core Security-Critical Modules
- [ ] **Memory Management** (`src/memory/`)
  - Memory-mapped arrays and zero-copy operations
  - Unsafe memory operations and safety documentation
  - Memory leak detection and resource tracking
- [ ] **Validation Framework** (`src/validation/`)
  - Input validation and sanitization
  - Constraint checking and error handling
  - Cross-platform validation logic
- [ ] **Error Handling** (`src/error/`)
  - Error propagation and information disclosure
  - Circuit breaker implementations
  - Recovery mechanisms
- [ ] **GPU Backends** (`src/gpu/`)
  - GPU memory management and device communication
  - Kernel execution and validation
  - Multi-backend security boundaries

#### Feature-Specific Security Areas
- [ ] **Memory-Efficient Operations** (feature: `memory_efficient`)
  - Out-of-core array processing
  - Temporary file handling and cleanup
  - Memory mapping security
- [ ] **Parallel Processing** (feature: `parallel`)
  - Thread safety and data races
  - Shared memory access patterns
  - Race condition prevention
- [ ] **Serialization** (feature: `serialization`)
  - Deserialization security (bincode, JSON)
  - Input validation for serialized data
  - Buffer overflow prevention
- [ ] **GPU Acceleration** (features: `cuda`, `opencl`, `metal`, `wgpu`)
  - Device memory security
  - Kernel validation and sandboxing
  - Cross-device data transfer security

### Out-of-Scope Components
- Third-party dependencies (covered by separate audits)
- Platform-specific OS security (delegated to OS)
- Network protocol security (application-level responsibility)

## Security Audit Areas

### 1. Memory Safety Audit

#### Unsafe Code Review
- [ ] **Location**: All `unsafe` blocks across the codebase
- [ ] **Documentation**: Verify safety invariants are documented
- [ ] **Validation**: Check precondition validation before unsafe operations
- [ ] **Scope**: Ensure minimal unsafe block scope

```rust
// Areas requiring special attention:
// - src/memory_efficient/zero_copy_streaming.rs
// - src/memory_efficient/memmap.rs  
// - src/gpu/kernels/ (CUDA/OpenCL kernels)
// - src/simd_ops.rs (SIMD intrinsics)
```

#### Memory Allocation Patterns
- [ ] **Buffer Overflows**: Array bounds checking
- [ ] **Use-After-Free**: Lifetime management
- [ ] **Double-Free**: Resource cleanup patterns
- [ ] **Memory Leaks**: Resource tracking and cleanup

### 2. Input Validation Security

#### Data Validation Framework
- [ ] **Array Dimensions**: Size limit enforcement
- [ ] **Numeric Ranges**: Overflow/underflow prevention
- [ ] **File Paths**: Directory traversal prevention
- [ ] **Serialized Data**: Malformed input handling

#### Attack Vector Analysis
- [ ] **Resource Exhaustion**: Large array allocation limits
- [ ] **Integer Overflow**: Calculation bounds checking
- [ ] **Format String**: Error message construction
- [ ] **Path Injection**: File system operation security

### 3. Concurrency Security

#### Thread Safety
- [ ] **Data Races**: Shared memory access patterns
- [ ] **Deadlocks**: Lock ordering and timeout mechanisms
- [ ] **Race Conditions**: Initialization and cleanup sequences
- [ ] **Memory Ordering**: Atomic operations and barriers

#### Parallel Processing Security
- [ ] **Work Stealing**: Task isolation and data leakage
- [ ] **Shared State**: Synchronization mechanisms
- [ ] **Resource Contention**: Fair scheduling and starvation prevention

### 4. GPU Security Model

#### Device Memory Management
- [ ] **Memory Isolation**: Cross-kernel memory protection
- [ ] **Buffer Overruns**: GPU buffer bounds checking
- [ ] **Device Access**: Unauthorized GPU resource access
- [ ] **Kernel Validation**: Malicious kernel prevention

#### Multi-Backend Security
- [ ] **Backend Isolation**: Cross-backend data leakage
- [ ] **Device Enumeration**: Information disclosure via device queries
- [ ] **Driver Security**: Interaction with system GPU drivers

### 5. Cryptographic Security

#### Random Number Generation
- [ ] **Entropy Sources**: CSPRNG usage verification
- [ ] **Seed Management**: Proper seed initialization
- [ ] **State Leakage**: RNG state protection

#### Hash Functions
- [ ] **Algorithm Selection**: Cryptographically secure hash functions
- [ ] **Timing Attacks**: Constant-time comparisons
- [ ] **Salt Usage**: Proper salt generation and storage

## Audit Preparation Materials

### Documentation Package
- [ ] **Architecture Overview**: System design and security boundaries
- [ ] **Threat Model**: Identified threats and mitigations
- [ ] **Security Requirements**: Specific security requirements per component
- [ ] **Code Coverage**: Security-relevant code coverage reports

### Test Scenarios
- [ ] **Fuzzing Results**: Input fuzzing test results and fixes
- [ ] **Stress Tests**: Resource exhaustion and recovery tests
- [ ] **Security Tests**: Specific security scenario tests
- [ ] **Regression Tests**: Previous vulnerability fix verification

### Code Review Materials
- [ ] **Unsafe Code Inventory**: Complete list of all unsafe blocks
- [ ] **Dependency Audit**: `cargo audit` results and mitigation plans
- [ ] **Static Analysis**: Results from security-focused static analysis
- [ ] **Lint Results**: Security-relevant lint warnings and resolutions

## Known Security Considerations

### Acknowledged Limitations
- [ ] **Memory Mapping**: OS-level security dependency for memory-mapped files
- [ ] **GPU Drivers**: Trust boundary at GPU driver interface
- [ ] **Temporary Files**: Filesystem-level security for temporary storage
- [ ] **Platform Features**: Platform-specific security feature dependencies

### Mitigations Implemented
- [ ] **Input Validation**: Comprehensive validation framework
- [ ] **Memory Safety**: Rust's memory safety + additional unsafe code documentation
- [ ] **Error Handling**: Secure error handling without information disclosure
- [ ] **Resource Limits**: Configurable resource consumption limits

### Areas for Enhanced Security
- [ ] **Memory Encryption**: Optional memory encryption for sensitive data
- [ ] **Kernel Sandboxing**: Enhanced GPU kernel isolation
- [ ] **Audit Logging**: Enhanced security event logging
- [ ] **Runtime Verification**: Additional runtime security checks

## Third-Party Audit Guidelines

### Auditor Requirements
- [ ] **Rust Expertise**: Deep understanding of Rust security model
- [ ] **Scientific Computing**: Understanding of numerical computing security
- [ ] **GPU Programming**: CUDA/OpenCL/Metal security knowledge
- [ ] **Memory Safety**: Experience with memory safety auditing

### Audit Methodology
- [ ] **Static Analysis**: Automated security scanning tools
- [ ] **Dynamic Analysis**: Runtime security testing
- [ ] **Manual Review**: Expert code review of security-critical sections
- [ ] **Threat Modeling**: Systematic threat identification and analysis

### Deliverables Expected
- [ ] **Security Assessment Report**: Comprehensive findings document
- [ ] **Vulnerability Inventory**: Prioritized list of security issues
- [ ] **Remediation Plan**: Specific steps to address findings
- [ ] **Compliance Assessment**: Standards compliance evaluation

## Audit Timeline

### Pre-Audit Phase (2 weeks)
- [ ] **Documentation Review**: Auditor reviews provided materials
- [ ] **Scope Confirmation**: Final audit scope agreement
- [ ] **Environment Setup**: Auditor access and tool setup
- [ ] **Initial Questions**: Clarification of audit requirements

### Active Audit Phase (4-6 weeks)
- [ ] **Static Analysis**: Automated security scanning
- [ ] **Code Review**: Manual security code review
- [ ] **Dynamic Testing**: Runtime security testing
- [ ] **Report Preparation**: Initial findings documentation

### Post-Audit Phase (2 weeks)
- [ ] **Report Review**: Internal review of audit findings
- [ ] **Remediation Planning**: Fix prioritization and scheduling
- [ ] **Final Report**: Complete audit report delivery
- [ ] **Follow-up**: Re-audit of critical findings

## Contact Information

### Security Team
- **Primary Contact**: security@scirs2.org
- **Emergency Contact**: security-urgent@scirs2.org
- **PGP Key**: Available at https://scirs2.org/security/pgp

### Technical Contacts
- **Core Team Lead**: Available for architecture questions
- **Memory Safety Expert**: Available for unsafe code reviews
- **GPU Security Specialist**: Available for GPU-related security questions

## Compliance and Standards

### Security Standards
- [ ] **NIST Cybersecurity Framework**: Alignment verification
- [ ] **OWASP Guidelines**: Web application security best practices
- [ ] **Rust Security Guidelines**: Rust-specific security practices
- [ ] **Scientific Computing Security**: Domain-specific security practices

### Regulatory Considerations
- [ ] **Export Control**: Cryptographic functionality compliance
- [ ] **Data Protection**: Privacy regulation compliance (GDPR, CCPA)
- [ ] **Industry Standards**: Relevant industry security standards

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**Document Version**: 1.0  
**Last Updated**: 2025-06-29  
**Next Review**: Q4 2025  
**Approval**: Security Team Lead

*This document is confidential and intended for authorized security audit personnel only.*