linux-platform-security

linux-platform-security is a skill for Claude Code from gmh5225/awesome-game-security. It costs 93 tokens per session (1,706 once invoked), scanned A, original, MIT.

A guide for investigating security boundaries on Linux, SteamOS, Steam Deck, and Proton, which runs some Windows games through Linux. It covers processes, permissions, isolation, memory evidence, and platform policy.

In plain words
What is it for?
Use it to review native Linux or Proton execution, credentials and capabilities, namespaces, seccomp, security modules, and Linux memory-forensics evidence.
Why use it?
It helps distinguish normal compatibility components from security failures or unsupported Windows mechanisms, avoiding incorrect conclusions about why a game or tool behaves differently.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions AGENTS.md.

Good fit Use it to review native Linux or Proton execution, credentials and capabilities, namespaces, seccomp, security modules, and Linux memory-forensics evidence.

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Install with agentmods
npx agentmods add skills/gmh5225/awesome-game-security/linux-platform-security
About the project

awesome-game-security is a curated collection focused on security research for games and game software, including cheating, anti-cheat systems, debugging, and anti-debugging. It is intended for security researchers and developers studying or building game-protection tools. The catalogue entries provide skills for AI coding agents related to the repository’s security workflows.

gmh5225/awesome-game-security · 3,502 stars · on GitHub · gs.awesome.rip

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add gmh5225/awesome-game-security --skill linux-platform-security
Clone the repo
git clone --depth 1 https://github.com/gmh5225/awesome-game-security

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for linux-platform-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/gmh5225/awesome-game-security/linux-platform-security/github.svg)](https://agentmods.dev/skills/gmh5225/awesome-game-security/linux-platform-security)
Your own site
<a href="https://agentmods.dev/skills/gmh5225/awesome-game-security/linux-platform-security"><img src="https://agentmods.dev/badge/skills/gmh5225/awesome-game-security/linux-platform-security/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for linux-platform-security

Your own site · 80×15
<a href="https://agentmods.dev/skills/gmh5225/awesome-game-security/linux-platform-security"><img src="https://agentmods.dev/badge/skills/gmh5225/awesome-game-security/linux-platform-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 93 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,706 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00093 $0.01706
Opus 5 $0.00046 $0.00853
Sonnet 5 $0.00019 $0.00341
Haiku 4.5 $0.00009 $0.00171

Measured 2d ago against content hash 87f00a86696e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

linux-platform-security scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/linux-platform-security/SKILL.md · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Linux, SteamOS, and Proton Security

Use this skill for Linux-specific interpretation of platform and process evidence. Use reverse-engineering for binary reconstruction, graphics-api for rendering/capture, and dma-attack for device-originated memory access.

Establish the Execution Stack

Record native ELF versus Windows code under Proton, architecture, game build, runtime version, graphics stack, kernel/distribution, launch context, and active policy. Separate game code, Wine/Proton user-space components, translation libraries, and Linux kernel behavior.

Proton is a Wine-based compatibility tool. Its presence does not imply Windows kernel mechanisms are available, nor is it evidence of malicious virtualization. Wine components, DXVK/vkd3d-proton, different module layouts, and diagnostic output can be expected artifacts. Valve Proton

Platform and protection-component support are product/build-specific. Do not assume a Windows kernel component runs through Proton. Distinguish launcher, media, runtime, graphics, and policy failures before attributing failed startup to an account restriction or malicious activity. Valve Proton compatibility guidance

Privilege and Isolation Boundaries

Surface Documented distinction Review implication
Credentials/capabilities Capabilities divide privilege and are per-thread attributes Record effective credentials and capability sets before asserting authority
User namespaces UID 0 in a user namespace need not have host-root authority Interpret credentials alongside mappings and namespace context
Seccomp System-call filtering reduces interfaces; it is not a complete sandbox Record active filter context and remaining boundaries
LSM policy Availability, enabled modules, and actual enforcement differ Confirm the selected policy rather than assuming SELinux/AppArmor from the OS name

Read the full file on GitHub · 154 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 154 lines · 93 tokens per session scan A 87f00a86696e

Subscribe to this mod's changes

linux-platform-security is a skill published in the GitHub repository gmh5225/awesome-game-security (3,502 stars, last pushed today), licensed MIT. It adds 93 tokens to every session and 1,706 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-09.

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