signal-handler SKILL.md skillA
signal-handler from dannyan/secguard-clang is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dannyan/secguard-clang/signal-handler@git:20261017.a78401fPins git:20261017.a78401f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dannyan/secguard-clang
- Path
extension/shared/skills/signal-handler/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261017.a78401f, committed Oct 17, 2026
- First version recorded
- Sep 13, 2026
- Size
- 3,004 bytes
- Repository stars
- 25
- License
- Apache-2.0
Classify signal handler evidence — a signal(2) handler that calls a non-async-signal-safe libc function. Maps to CWE-479.
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
## Signal Handler Analysis (CWE-479) ### Evidence Pattern A signal-handler candidate has: - **signal_handler_unsafe**: the non-async-signal-safe call (e.g. `malloc`, `printf`, `pthread_mutex_lock`) with category `signal_handler_unsafe` - The event's `function` is the handler registered via `signal(SIGxxx, handler)` - **call_path**: The registering function is reachable from an entry point ### Hint Tokens (Verdict Basis) | Token | Meaning | Your action | |-------|---------|-------------| | `async-unsafe@<fn>` | the handler calls this function, which is off the POSIX async-signal-safe list | a certain CWE-479 — verify the call is inside the handler, then confirm | `async-unsafe@` names the offending call; the defect is the non-reentrancy itself, so no dataflow proof is needed beyond the call being in the handler. ### Detection Logic 1. Find `signal(SIGxxx, handler)` registrations where `handler` is a named function (not `SIG_DFL`/`SIG_IGN`) 2. Find the handler's function definition 3. Emit `SIGNAL_HANDLER` for each DIRECT call to a known non-async-signal-safe libc function in its body ### Classification Rules | Condition | Classification | |-----------|---------------| …
Read the whole file at its exact version.
How to install
mdr add dannyan/secguard-clang/signal-handler@sha256:ee4b4a8b1efd8f32The line at the top of this page pins the label git:20261017.a78401f, 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_dfqsbsyyhvroyxhj)
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Versions
The registry has recorded 5 versions of this file, between Sep 13, 2026 and Oct 17, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261017.a78401f latest | 2026-10-17 | a78401f | 3,004 B | A | view · diff |
| git:20261016.fb3b156 | 2026-10-16 | fb3b156 | 2,568 B | A | view · diff |
| git:20260914.1ef9fbc | 2026-09-14 | 1ef9fbc | 2,605 B | A | view · diff |
| git:20260913.46c999d | 2026-09-13 | 46c999d | 2,677 B | A | view · diff |
| git:20260913.4c35c60 | 2026-09-13 | 4c35c60 | 2,341 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3004 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
dannyan/secguard-clang · 25 stars · license Apache-2.0 · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dfqsbsyyhvroyxhj GET https://markdownregistry.com/api/v1/resolve?ref=dannyan/secguard-clang/signal-handler GET https://markdownregistry.com/api/v1/blob/ee4b4a8b1efd8f324a4afd250839f62c74c3ed8d968991df69ddd04a34208fbb
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.