Incorrect Use of Memset Detection

detecting-incorrect-memset

Detects incorrect use of memset() including wrong argument order, incorrect size calculations, and misunderstood behavior. Use when analyzing memory initialization, buffer clearing, or investigating memset() usage errors.

majiayu000/claude-skill-registry·0installs663starsSecurity

SKILL.md

Full skill instructions

Incorrect Use of Memset Detection

Detection Workflow

Identify memset operations: Find all memset() calls, locate buffer clearing operations, identify memory initialization, map sensitive data handling
Analyze argument order: Verify memset argument order, check pointer/value/size order, assess argument correctness, review common mistakes
Check size calculation: Verify size parameter, check sizeof usage, assess size correctness, review buffer dimensions
Assess security impact: Does incorrect memset leave data? Is sensitive data exposed? Can compiler optimize away memset? What's the security impact?

Key Patterns

Wrong argument order: memset with wrong argument order, size and value arguments swapped, pointer and size arguments swapped, common memset mistakes
Incorrect size calculation: sizeof on pointer instead of buffer, off-by-one errors in size, size calculation with overflow, wrong size for buffer type
Misunderstood memset behavior: expecting memset to return filled value, assuming memset validates arguments, thinking memset checks for NULL, misunderstanding memset return value
Ineffective clearing: memset on optimized-away variables, compiler removing memset calls, incomplete buffer clearing, missing memset on sensitive data

Output Format

Report with: id, type, subtype, severity, confidence, location, vulnerability, memset_call, correct_order, arguments, actual_operation, expected_operation, exploitable, attack_scenario, impact, mitigation.

Severity Guidelines

HIGH: Incorrect memset leaving sensitive data
MEDIUM: Incorrect memset causing memory corruption
LOW: Minor memset errors

Install skill

Copy and run in your terminal

npx -y skills add https://github.com/majiayu000/claude-skill-registry --skill detecting-incorrect-memset

View on GitHub

skills/data/detecting-incorrect-memset/SKILL.md

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