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doc/using: clarify security support status

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This is currently the status quo as per discussion in the NixOS
Security Discussions channel. Let's state it clearly to avoid people
being surprised.
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Julian Stecklina
2026-07-08 10:25:51 +02:00
parent bf1e2d1599
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doc/using/platform-support.chapter.md
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# Platform Support {#chap-platform-support}
Packages receive varying degrees of support, both in terms of maintainer attention and available computation resources for continuous integration (CI). We have 7 defined tiers denoting how well supported each platform is.
Packages receive varying degrees of support, both in terms of maintainer and security team attention and available computation resources for continuous integration (CI). We have 7 defined tiers denoting how well supported each platform is.
## Tiers {#sec-platform-tiers}
### Tier 1 {#sec-platform-tier1}
[Tier 1](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-1) platforms receive the highest level of support where problems can block updates, platform-specific patches are freely applied, and most packages are expected to work.
[Tier 1](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-1) platforms receive the highest level of support where problems can block updates, security fixes are treated with urgency, platform-specific patches are freely applied, and most packages are expected to work.
### Tier 2 {#sec-platform-tier2}
[Tier 2](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-2) platforms are expected to remain functional with updates, receive platform-specific patches as needed, and have many packages built by Hydra with full ofBorg support.
[Tier 2](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-2) platforms are expected to remain functional and secure with updates, receive platform-specific patches as needed, and have many packages built by Hydra with full ofBorg support.
### Tier 3 {#sec-platform-tier3}
@@ -22,25 +22,25 @@ Platform Tiers [4 through 7](https://github.com/NixOS/rfcs/blob/master/rfcs/0046
## Breakdown {#sec-platform-breakdown}
| Triple | Support Tier | Channel Blockers | Hydra Support | Ofborg Support | Bootstrap Tarballs | Cross Compiling Support |
| ------------------------------------- | ------------ | ---------------- | ------------- | -------------- | ------------------ | ----------------------- |
| `x86_64-unknown-linux-gnu` | [Tier 1](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-1) | Many | ✔️ | ✔️ | ✔️ | ✔️ |
| `aarch64-unknown-linux-gnu` | [Tier 2](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-2) | Some | ✔️ | ✔️ | ✔️ | ✔️ |
| `x86_64-unknown-linux-musl` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | Limited | ❌ | ✔️ | ✔️ |
| `aarch64-unknown-linux-musl` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | Limited | ❌ | ✔️ | ✔️ |
| `x86_64-unknown-unknown-freebsd` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `arm64-apple-darwin` | [Tier 2](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-2) | Some | ✔️ | ✔️ | ✔️ | ❌ |
| `i686-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | Limited | ❌ | ✔️ | ✔️ |
| `riscv32-unknown-linux-gnu` | [Tier 4](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-4) | None | ❌ | ❌ | ❌ | ✔️ |
| `riscv64-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `loongarch64-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `armv6l-unknown-linux-gnueabihf` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `armv6l-unknown-linux-musleabihf` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `armv7l-unknown-linux-gnueabihf` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `armv5tel-unknown-linux-gnueabi` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `mips64el-unknown-linux-gnuabi64` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `mips64el-unknown-linux-gnuabin32` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `mipsel-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `powerpc64-unknown-linux-gnuabielfv2` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `powerpc64le-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| `s390x-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ✔️ | ✔️ |
| Triple | Support Tier | Channel Blockers | Hydra Support | Security Support | Ofborg Support | Bootstrap Tarballs | Cross Compiling Support |
|---------------------------------------|------------------------------------------------------------------------------------------------|------------------|---------------|------------------|----------------|--------------------|-------------------------|
| `x86_64-unknown-linux-gnu` | [Tier 1](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-1) | Many | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ |
| `aarch64-unknown-linux-gnu` | [Tier 2](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-2) | Some | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ |
| `x86_64-unknown-linux-musl` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | Limited | ❌ | ❌ | ✔️ | ✔️ |
| `aarch64-unknown-linux-musl` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | Limited | ❌ | ❌ | ✔️ | ✔️ |
| `x86_64-unknown-unknown-freebsd` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `arm64-apple-darwin` | [Tier 2](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-2) | Some | ✔️ | ✔️ | ✔️ | ✔️ | ❌ |
| `i686-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | Limited | ❌ | ❌ | ✔️ | ✔️ |
| `riscv32-unknown-linux-gnu` | [Tier 4](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-4) | None | ❌ | ❌ | ❌ | ❌ | ✔️ |
| `riscv64-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `loongarch64-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `armv6l-unknown-linux-gnueabihf` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `armv6l-unknown-linux-musleabihf` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `armv7l-unknown-linux-gnueabihf` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `armv5tel-unknown-linux-gnueabi` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `mips64el-unknown-linux-gnuabi64` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `mips64el-unknown-linux-gnuabin32` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `mipsel-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `powerpc64-unknown-linux-gnuabielfv2` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `powerpc64le-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |
| `s390x-unknown-linux-gnu` | [Tier 3](https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3) | None | ❌ | ❌ | ❌ | ✔️ | ✔️ |