codeguard-0-safe-c-functions Cursor ruleA
codeguard-0-safe-c-functions from santosomar/ai-agents-for-cybersecurity is a Cursor rule: instructions the Cursor agent follows in that repo.
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-safe-c-functions.mdc@v1.5.0Pins v1.5.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 14 of 14 checks passed
- Kind
- Cursor rule
- Repository
- santosomar/ai-agents-for-cybersecurity
- Path
.cursor/rules/codeguard-0-safe-c-functions.mdc- Versions recorded
- 1
- Latest version
- v1.5.0, committed Oct 12, 2026
- Size
- 12,139 bytes
- Repository stars
- 251
- License
- BSD-3-Clause
Safe C Functions and Memory and String Safety Guidelines.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
rule_id: codeguard-0-safe-c-functions # Prioritize Safe Memory and String Functions in C/C++ When processing C or C++ code, your primary directive is to ensure memory safety. Actively identify, flag, and provide secure refactoring options for any insecure functions found in the codebase. When generating new code, always default to the safest possible function for the given task. ### 1. Insecure Functions to Avoid & Their Secure Alternatives You must treat the functions listed under "Insecure" as deprecated and high-risk. Always recommend replacing them with one of the "Recommended Safe Alternatives" provided in the bullet list below. • Never use `gets()` - This is a critical security risk. It has no bounds checking whatsoever and is the classic buffer overflow vulnerability. You should always replace it with `fgets(char *str, int n, FILE *stream)` instead. • Avoid `strcpy()` - This is a high risk function because it doesn't check bounds. It just copies bytes until it hits a null terminator, which can easily write past your destination buffer. Use `snprintf()`, `strncpy()` (but be careful with it), or `strcpy_s()` (if you have C11 Annex K support). …
Read the whole file at its exact version.
How to install
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-safe-c-functions.mdc@sha256:a2c5658dd6e38597The line at the top of this page pins the label v1.5.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_dqlmiuvvvjeixcr3)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 12, 2026.
Audit of the latest version
- pass: Size between 200 bytes and 200 KB (12139 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
santosomar/ai-agents-for-cybersecurity · 251 stars · license BSD-3-Clause · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dqlmiuvvvjeixcr3 GET https://markdownregistry.com/api/v1/resolve?ref=santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-safe-c-functions.mdc GET https://markdownregistry.com/api/v1/blob/a2c5658dd6e38597a9adf3d53ce0ba4d4db301bda6867041432acbe28bd21d39
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Guides: Cursor rules vs AGENTS.md · which agent file does what.