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docs: add Contributing, Security, and Roadmap docs; link them from the README
Create docs/CONTRIBUTING.md (build/verify workflow, coding style, kernel gotchas, commit & PR conventions), docs/SECURITY.md (supported versions, private vulnerability reporting, documented caveats), and docs/ROADMAP.md (shipped in v1.0.0 plus near/mid/long-term plans). Add a Documentation and Contributing section to the README pointing at all four docs. Note: used the conventional CONTRIBUTING.md / SECURITY.md filenames (in docs/) so GitHub auto-detects them as community-health files. Co-Authored-By: Claude Opus 4.8 <[email protected]> Claude-Session: https://claude.ai/code/session_01Fh5z6V7nGPbHvqVG5p4CXX
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@@ -273,6 +273,26 @@ Download precompiled kernel binaries and bootable disk images from GitHub:
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---
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## 📚 Documentation
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| Document | What's inside |
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|---|---|
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| 📝 **[Contributing Guide](docs/CONTRIBUTING.md)** | How to build, code style, kernel gotchas, commit & PR conventions |
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| 🔒 **[Security Policy](docs/SECURITY.md)** | Supported versions, how to report a vulnerability, known caveats |
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| 🗺️ **[Roadmap](docs/ROADMAP.md)** | What shipped in v1.0.0 and what's planned next |
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| 🤖 **[Autonomous Dev Roadmap](docs/AUTODEV_ROADMAP.md)** | Fine-grained per-session engineering backlog |
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---
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## 🤝 Contributing
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Contributions are welcome! Please read the **[Contributing Guide](docs/CONTRIBUTING.md)**
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before opening a pull request, and see the **[Roadmap](docs/ROADMAP.md)** for
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where help is most valuable. Found a security issue? Follow the
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**[Security Policy](docs/SECURITY.md)** — do not open a public issue.
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---
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## 📄 License
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SUB-OS is distributed under the open-source **MIT License**. See [`LICENSE`](LICENSE) for details.
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@@ -0,0 +1,183 @@
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<div align="center">
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<img src="../assets/logo_SUB_OS.png" alt="SUB-OS logo" width="140" height="140" />
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# Contributing to SUB-OS
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</div>
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Thanks for your interest in **SUB-OS** — a multi-architecture, modular monolithic,
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Linux-compatible operating system written from scratch in C, C++17, Assembly,
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freestanding Rust (`no_std`), and the native SUB Language. This guide covers how
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to build, the conventions we follow, and how to get a change merged.
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---
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## Table of Contents
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- [Ground rules](#ground-rules)
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- [Development environment](#development-environment)
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- [Building](#building)
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- [Running & verifying](#running--verifying)
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- [Coding style](#coding-style)
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- [Kernel gotchas](#kernel-gotchas)
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- [Commit & PR conventions](#commit--pr-conventions)
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- [Reporting bugs](#reporting-bugs)
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---
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## Ground rules
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- **Verify before you claim.** Nothing is "done" until it builds *and* boots.
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Every crypto primitive and codec is tested against a reference vector (RFC or
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a PIL-generated fixture) **before** it enters the kernel. Hold new code to the
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same bar.
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- **No libc, no POSIX host.** The kernel is freestanding. No floating point in
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kernel space (`-mno-sse`); all math is integer.
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- **Small, reviewable changes.** One feature or fix per pull request, with a
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clear description of what you verified and how.
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- **Be kind.** Assume good faith, keep discussion technical, and respect
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reviewers' time.
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---
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## Development environment
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The project targets `x86_64`, `aarch64`, and `armv8i` (AArch32). On a Debian/
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Ubuntu host, install the toolchains and emulators:
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```bash
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sudo apt update
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sudo apt install build-essential g++ nasm qemu-system-x86 qemu-system-arm \
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gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu \
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gcc-arm-linux-gnueabihf binutils-arm-linux-gnueabihf \
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rustc cargo dialog python3
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```
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For the freestanding Rust layer:
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```bash
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rustup target add x86_64-unknown-none
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```
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> The x86_64 kernel is normally built with an `x86_64-elf-` cross toolchain. A
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> stock `x86_64-linux-gnu-` GCC also works — pass it via `CROSS_COMPILE=`.
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---
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## Building
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SUB-OS uses a Linux-style Kconfig + Kbuild flow. The version/codename lives at
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the top of the `Makefile` (`VERSION`/`PATCHLEVEL`/`SUBLEVEL`/`EXTRAVERSION`/
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`NAME`) and in [`include/init/version.h`](../include/init/version.h) — keep the
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two in sync when you bump a release.
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```bash
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# Configure (interactive) or pick an architecture preset:
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make configure # or: make menuconfig
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make x86_64_defconfig # x86_64 (Intel / AMD)
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make aarch64_defconfig # 64-bit ARM (Cortex-A57)
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make armv8i_defconfig # 32-bit ARM (Cortex-A15)
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# Build:
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make # builds the configured/default ARCH
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make ARCH=aarch64 # or target one explicitly
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```
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> **Always `make clean` when switching `ARCH`.** Object files from another
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> architecture link into a *"file in wrong format"* error otherwise.
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---
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## Running & verifying
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```bash
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make run # x86_64 disk image in QEMU
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make run-gui # windowed graphical desktop
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make run-fullscreen # fullscreen desktop
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make run-vnc # headless: VNC on localhost:5900
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make ARCH=aarch64 run # ARM targets
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```
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Default login is **`SUB` / `SUB`**. Pass `nogui`, `text`, `emergency`, or
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`single` on the kernel command line to boot to the TTY instead of the desktop.
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**Headless verification** (what CI and reviewers use): boot with
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`-serial file:serial.log -monitor unix:mon.sock,server,nowait -display none`,
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drive the login over the monitor `sendkey` interface, and capture the screen
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with `screendump`. For a code path with no UI, add a temporary CLI applet under
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`userland/lazybox/` that exercises it over serial, verify, then revert the
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temporary hook.
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When you submit a change, state plainly **what you ran and what you saw** — build
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output, boot log excerpt, screenshot, or reference-vector comparison.
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---
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## Coding style
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- **C:** freestanding C11. Match the surrounding file — 4-space indent, K&R
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braces, `snake_case` for functions and variables, `SCREAMING_SNAKE` for
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macros/constants. Keep comment density and idiom consistent with the module
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you're editing.
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- **Assembly:** per-arch under `arch/<arch>/`. `.S` files run through `cpp`, so
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**no nested `/* ... */` comments**.
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- **Rust:** `no_std`, no allocator assumptions beyond what the kernel provides.
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- **C++:** freestanding C++17, no exceptions/RTTI, no host STL.
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- **Headers:** public interfaces in `include/`, with an include guard.
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- **No new external dependencies** in kernel space.
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---
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## Kernel gotchas
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These bite newcomers — internalize them before touching the relevant subsystem:
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- **`printk`/`vsprintf` are minimal.** Supported conversions are
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`c s d i u o x X p %` only — **no** length modifiers (`l`, `ll`) and **no**
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field width. Cast to `int` / `unsigned` / `void*` at the call site.
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- **`list_del()` NULLs both links**, so `list_empty()` is not a reliable "is
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this node still queued?" test after a delete — inspect the links directly.
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- **Preemption is armed after boot.** A context switch must never run while a
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plain spinlock is held: wrap such sections with
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`sched_preempt_disable/enable` (as `printk` does). `weave_lock` sections use
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`arch_irq_save/restore` so the timer tick cannot fire inside them.
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- **Dead tasks/stacks are not reclaimed yet.** Prefer one long-lived worker
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thread over spawning a task per request.
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- **Network checksums are byte-wise on purpose** — word-at-a-time reads get
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reordered around the caller's `hdr->checksum = 0` store under `-O2`.
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- **Ethernet frames are padded to 60 bytes** — trim payloads to the IP
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`total_length`, never the frame length.
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---
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## Commit & PR conventions
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- **Commit messages** follow Conventional-Commits-style prefixes:
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`feat(scope): …`, `fix(scope): …`, `build: …`, `docs: …`, `release(vX.Y.Z): …`.
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Write the subject in the imperative and add a body explaining *what changed
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and what you verified*.
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- **Branch** off `main` for your work; open a pull request against `main`.
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- **One logical change per PR.** Rebase/squash noisy WIP commits before review.
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- **CI must pass** (build + kernel verification) before merge.
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- In the PR description, include: what the change does, which architectures you
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built, and how you verified boot behaviour.
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---
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## Reporting bugs
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Open a GitHub issue with:
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1. **Architecture** and how you built (`defconfig`, `ARCH`, toolchain).
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2. **Exact command** that reproduces it.
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3. **What you expected** vs. **what happened** — paste the serial log and, for
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the desktop, attach a `screendump`.
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4. The commit SHA (`git rev-parse --short HEAD`).
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For **security-sensitive** reports, do **not** open a public issue — follow the
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[Security Policy](SECURITY.md) instead.
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---
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Happy hacking. 🐉
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@@ -0,0 +1,87 @@
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<div align="center">
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<img src="../assets/logo_SUB_OS.png" alt="SUB-OS logo" width="140" height="140" />
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# SUB-OS Roadmap
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</div>
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Where SUB-OS is, and where it's going. This is a living document — priorities
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shift as the kernel grows. For the fine-grained, per-session engineering backlog
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see [`AUTODEV_ROADMAP.md`](AUTODEV_ROADMAP.md).
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**Current release:** [`v1.0.0` — Titan](https://github.com/subhobhai943/SUB-OS/releases/tag/v1.0.0) (stable)
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---
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## ✅ Shipped in v1.0.0 (Titan)
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- **Weave scheduler** — genuine per-architecture context switching with
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behavioural priority lanes; cooperative **and** preemptive (timer-driven).
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- **Concurrency core** — wait queues, completions, futexes, tiny RCU.
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- **Memory management** — buddy PMM, slab allocator, per-process page tables,
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page cache.
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- **VFS** — ext2, FAT32, ramfs, procfs, sysfs, devfs.
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- **Networking** — Ethernet/ARP/IPv4/UDP, full TCP (active + passive open),
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DHCP, DNS, NetFilter; `sshd` and `httpd`.
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- **TLS 1.3 client** — X25519, ChaCha20-Poly1305, HKDF key schedule (browses
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HTTPS; see the [Security Policy](SECURITY.md) for the cert-verification caveat).
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- **Image & compression codecs** — DEFLATE/zlib, PNG, BMP, baseline JPEG.
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- **Graphical desktop (SUB-WT)** — 60 FPS compositor, window manager, Terminal,
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Files, System & Network Monitor, a real web browser with inline images, and
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more.
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- **Multi-arch** — `x86_64`, `aarch64`, `armv8i`.
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- **Linux-style build** — Kconfig TUI, Kbuild, per-arch defconfigs.
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---
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## 🔜 Near term (1.1.x)
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- **Thread reaping / zombie cleanup.** Exited kernel threads currently leak their
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16 KB stack + `task_t`. Add a reaper (a dead list drained by the idle thread).
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- **Boot-test the ARM context switch.** Wire `weave_selftest()` into the
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aarch64/armv8i boot paths and verify the AArch64/AArch32 `sub_ctx_switch`
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frames under `qemu-system-aarch64` / `-arm`.
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- **`fork`/`exec`/`wait` for ring-3 userland.** Build on the ELF64 loader and
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per-process page tables so `sh` can spawn and reap real children.
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- **TLS certificate verification.** Close the biggest documented security gap by
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validating the server chain against a bundled trust store.
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---
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## 🌗 Mid term (1.x)
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- **Capability-based IPC ("sub-ports").** Typed, capability-addressed message
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endpoints distinct from the SysV msg/pipe/shm set already in `ipc/`.
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- **SMP bring-up (x86_64).** AP boot trampoline, per-CPU run lanes, and per-CPU
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Weave lanes with work-stealing.
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- **Desktop maturity.** Compositor damage tracking, a richer file manager, a
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text editor, and a settings panel over the toolkit widgets.
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- **Storage & FS.** Write-back caching improvements, journaling groundwork, and
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broader ext2 write coverage.
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- **Exploit mitigations.** Enforce W^X on all mappings, add kernel stack
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canaries, and begin ASLR groundwork.
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---
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## 🌒 Long term (exploratory)
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- **Self-hosting toolchain path** — grow the userland toward building parts of
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SUB-OS on SUB-OS.
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- **A native SUB-Language userland** — first-class apps written in `.sb`.
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- **Real hardware bring-up** — beyond QEMU, on at least one aarch64 board.
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- **Networking depth** — IPv6, a TLS *server*, and a hardened, fuzzed stack.
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- **Audio/graphics acceleration** — virtio-gpu 3D paths and a mixer.
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---
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## How priorities are chosen
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Each development pass picks the single highest-value item achievable and
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verifiable in one session, implements it, verifies it under QEMU, and refines
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the backlog. Correctness and boot-tested verification always gate a feature
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before it's called done. See [`CONTRIBUTING.md`](CONTRIBUTING.md) for the
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verification discipline.
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> Have an idea or want to pick something up? Open an issue or a discussion —
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> contributions against any of the items above are very welcome.
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@@ -0,0 +1,95 @@
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<div align="center">
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<img src="../assets/logo_SUB_OS.png" alt="SUB-OS logo" width="140" height="140" />
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# Security Policy
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</div>
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SUB-OS is an from-scratch, research/hobby operating system. It is built to be
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correct and educational, **not** to be deployed as a hardened production system.
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This document explains what is supported, how to report a vulnerability, and the
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security caveats you should know before running it anywhere that matters.
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---
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## Supported versions
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| Version | Codename | Status | Security fixes |
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|---------|----------|--------|----------------|
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| `1.0.0` (`1.0.x`) | Titan | ✅ Current stable | Yes |
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| `0.2.x` / `0.0.x` (alpha/beta) | — | ⚠️ Superseded | No |
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Only the current stable line receives security fixes. Please upgrade to the
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latest [release](https://github.com/subhobhai943/SUB-OS/releases/latest) before
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reporting an issue.
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---
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## Reporting a vulnerability
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**Please do not open a public GitHub issue for a security vulnerability.**
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Instead, report it privately through GitHub's coordinated-disclosure channel:
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1. Go to the repository's **Security** tab →
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**[Report a vulnerability](https://github.com/subhobhai943/SUB-OS/security/advisories/new)**.
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2. This opens a **private security advisory** visible only to you and the
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maintainers.
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3. Include:
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- Affected version / commit SHA and architecture.
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- A description of the class of problem and its impact.
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- Minimal steps or a proof-of-concept that reproduces it.
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- Any suggested remediation, if you have one.
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> Please describe the **class** of problem and its impact rather than publishing
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> a weaponized, step-by-step exploit.
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### What to expect
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- **Acknowledgement:** we aim to confirm receipt within **7 days**.
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- **Assessment:** an initial severity assessment and triage within **14 days**.
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- **Fix & disclosure:** we coordinate a fix and a disclosure timeline with you,
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and credit you in the advisory and release notes (unless you prefer to remain
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anonymous).
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---
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## Known security caveats
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SUB-OS deliberately trades several hardening properties for simplicity and
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readability at this stage. These are **known and documented**, not bugs:
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- **TLS has no certificate verification.** The TLS 1.3 client performs the key
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exchange and AEAD correctly but **does not validate the server certificate
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chain**. Connections are encrypted but **not authenticated** — they are
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trivially MITM-able. Do not use it to protect real secrets.
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- **Default credentials are `SUB` / `SUB`.** Every image ships with the same
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well-known login. Treat any running instance as unauthenticated.
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- **No exploit mitigations yet.** There is no ASLR, no stack canaries in kernel
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space, and W^X is not enforced on every mapping. Some segments load RWX.
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- **Single-user, cooperative trust model.** Isolation between the ring-3 shell
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and the kernel is minimal; the userland is trusted.
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- **Networking is best-effort.** The stack is a from-scratch implementation and
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has not been fuzzed or audited against hostile packets.
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Run SUB-OS in a **VM or emulator (QEMU)**, on isolated networks, and never with
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real credentials or sensitive data.
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||||
---
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## Scope
|
||||
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||||
In scope for a security report:
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||||
|
||||
- Memory-safety faults reachable from the network stack, filesystem parsers, or
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the image/crypto codecs.
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- Authentication or privilege-boundary bypasses beyond the documented caveats.
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- Cryptographic implementation errors (e.g. a broken AEAD or key schedule).
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Out of scope (already documented above): the default credentials, the absence
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of TLS certificate verification, and the lack of exploit mitigations.
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||||
---
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||||
|
||||
Thank you for helping keep SUB-OS and its users safe. 🐉
|
||||
Reference in new issue
Block a user