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Add features.md to formalize the runc features JSON
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Add `features.md` and `features-linux.md`, to formalize the `runc features` JSON that was introduced in runc v1.1.0-rc.1 .

A runtime caller MAY use this JSON to detect the features implemented by the runtime.

The spec corresponds to https://github.com/opencontainers/runc/blob/v1.1.0-rc.1/types/features/features.go
(opencontainers/runc PR 3296, opencontainers/runc PR 3310)

Differences from runc v1.1.0-rc.1:
- Add `.linux.intelRdt.enabled` field
- Add `.linux.cgroup.rdma` field

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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AkihiroSuda committed Dec 16, 2021
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2 changes: 2 additions & 0 deletions Makefile
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Expand Up @@ -30,6 +30,8 @@ DOC_FILES := \
config.md \
config-linux.md \
config-solaris.md \
features.md \
features-linux.md \
glossary.md

default: docs
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200 changes: 200 additions & 0 deletions features-linux.md
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# <a name="linuxFeatures" />Linux Features Document

This document describes the [Linux-specific section](features.md#platform-specific-features) of the [features document](features.md).

## <a name="linuxFeaturesNamespaces" />Namespaces

* **`namespaces`** (array of strings, OPTIONAL) The recognized names of the namespaces, including namespaces that might not be supported by the host operating system.
The runtime MUST recognize the elements in this array as the [`type` of `linux.namespaces` objects in `config.json`](config-linux.md#namespaces).

### Example

```json
"namespaces": [
"cgroup",
"ipc",
"mount",
"network",
"pid",
"user",
"uts"
]
```

## <a name="linuxFeaturesCapabilities" />Capabilities

* **`capabilities`** (array of strings, OPTIONAL) The recognized names of the capabilities, including capabilities that might not be supported by the host operating system.
The runtime MUST recognize the elements in this array in the [`process.capabilities` object of `config.json`](config.md#linux-process).

### Example

```json
"capabilities": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_DAC_READ_SEARCH",
"CAP_FOWNER",
"CAP_FSETID",
"CAP_KILL",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETPCAP",
"CAP_LINUX_IMMUTABLE",
"CAP_NET_BIND_SERVICE",
"CAP_NET_BROADCAST",
"CAP_NET_ADMIN",
"CAP_NET_RAW",
"CAP_IPC_LOCK",
"CAP_IPC_OWNER",
"CAP_SYS_MODULE",
"CAP_SYS_RAWIO",
"CAP_SYS_CHROOT",
"CAP_SYS_PTRACE",
"CAP_SYS_PACCT",
"CAP_SYS_ADMIN",
"CAP_SYS_BOOT",
"CAP_SYS_NICE",
"CAP_SYS_RESOURCE",
"CAP_SYS_TIME",
"CAP_SYS_TTY_CONFIG",
"CAP_MKNOD",
"CAP_LEASE",
"CAP_AUDIT_WRITE",
"CAP_AUDIT_CONTROL",
"CAP_SETFCAP",
"CAP_MAC_OVERRIDE",
"CAP_MAC_ADMIN",
"CAP_SYSLOG",
"CAP_WAKE_ALARM",
"CAP_BLOCK_SUSPEND",
"CAP_AUDIT_READ",
"CAP_PERFMON",
"CAP_BPF",
"CAP_CHECKPOINT_RESTORE"
]
```

## <a name="linuxFeaturesCgroup" />Cgroup

**`cgroup`** (object, OPTIONAL) represents the runtime's implementation status of cgroup managers.
Irrelevant to the cgroup version of the host operating system.

* **`v1`** (bool, OPTIONAL) represents whether the runtime supports cgroup v1.
* **`v2`** (bool, OPTIONAL) represents whether the runtime supports cgroup v2.
* **`systemd`** (bool, OPTIONAL) represents whether the runtime supports system-wide systemd cgroup manager.
* **`systemdUser`** (bool, OPTIONAL) represents whether the runtime supports user-scoped systemd cgroup manager.
* **`rdma`** (bool, OPTIONAL) represents whether the runtime supports RDMA cgroup controller.

### Example

```json
"cgroup": {
"v1": true,
"v2": true,
"systemd": true,
"systemdUser": true,
"rdma": false
}
```

## <a name="linuxFeaturesSeccomp" />Seccomp

**`seccomp`** (object, OPTIONAL) represents the runtime's implementation status of seccomp.
Irrelevant to the kernel version of the host operating system.

* **`enabled`** (bool, OPTIONAL) represents whether the runtime supports seccomp.
* **`actions`** (array of strings, OPTIONAL) The recognized names of the seccomp actions.
The runtime MUST recognize the elements in this array in the [`syscalls[].action` property of the `linux.seccomp` object in `config.json`](config-linux.md#seccomp).
* **`operators`** (array of strings, OPTIONAL) The recognized names of the seccomp operators.
The runtime MUST recognize the elements in this array in the [`syscalls[].args[].op` property of the `linux.seccomp` object in `config.json`](config-linux.md#seccomp).
* **`archs`** (array of strings, OPTIONAL) The recognized names of the seccomp architectures.
The runtime MUST recognize the elements in this array in the [`architectures` property of the `linux.seccomp` object in `config.json`](config-linux.md#seccomp).

### Example

```json
"seccomp": {
"enabled": true,
"actions": [
"SCMP_ACT_ALLOW",
"SCMP_ACT_ERRNO",
"SCMP_ACT_KILL",
"SCMP_ACT_LOG",
"SCMP_ACT_NOTIFY",
"SCMP_ACT_TRACE",
"SCMP_ACT_TRAP"
],
"operators": [
"SCMP_CMP_EQ",
"SCMP_CMP_GE",
"SCMP_CMP_GT",
"SCMP_CMP_LE",
"SCMP_CMP_LT",
"SCMP_CMP_MASKED_EQ",
"SCMP_CMP_NE"
],
"archs": [
"SCMP_ARCH_AARCH64",
"SCMP_ARCH_ARM",
"SCMP_ARCH_MIPS",
"SCMP_ARCH_MIPS64",
"SCMP_ARCH_MIPS64N32",
"SCMP_ARCH_MIPSEL",
"SCMP_ARCH_MIPSEL64",
"SCMP_ARCH_MIPSEL64N32",
"SCMP_ARCH_PPC",
"SCMP_ARCH_PPC64",
"SCMP_ARCH_PPC64LE",
"SCMP_ARCH_S390",
"SCMP_ARCH_S390X",
"SCMP_ARCH_X32",
"SCMP_ARCH_X86",
"SCMP_ARCH_X86_64"
]
}
```

## <a name="linuxFeaturesApparmor" />AppArmor

**`apparmor`** (object, OPTIONAL) represents the runtime's implementation status of AppArmor.
Irrelevant to the availability of AppArmor on the host operating system.

* **`enabled`** (bool, OPTIONAL) represents whether the runtime supports AppArmor.

### Example

```json
"apparmor": {
"enabled": true
}
```

## <a name="linuxFeaturesApparmor" />SELinux

**`selinux`** (object, OPTIONAL) represents the runtime's implementation status of SELinux.
Irrelevant to the availability of SELinux on the host operating system.

* **`enabled`** (bool, OPTIONAL) represents whether the runtime supports SELinux.

### Example

```json
"selinux": {
"enabled": true
}
```

## <a name="linuxFeaturesIntelRdt" />Intel RDT

**`intelRdt`** (object, OPTIONAL) represents the runtime's implementation status of Intel RDT.
Irrelevant to the availability of Intel RDT on the host operating system.

* **`enabled`** (bool, OPTIONAL) represents whether the runtime supports Intel RDT.

### Example

```json
"intelRdt": {
"enabled": true
}
```
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