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config-linux: Clarify where device nodes can be created #1148

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Feb 15, 2023
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config-linux: Clarify where device nodes can be created #1148

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9 changes: 9 additions & 0 deletions config-linux.md
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Expand Up @@ -118,6 +118,7 @@ Each entry has the following structure:
More info in [mknod(1)][mknod.1].
* **`path`** *(string, REQUIRED)* - full path to device inside container.
If a [file][] already exists at `path` that does not match the requested device, the runtime MUST generate an error.
The path MAY be anywhere in the container filesystem, notably outside of `/dev`.
* **`major, minor`** *(int64, REQUIRED unless `type` is `p`)* - [major, minor numbers][devices] for the device.
* **`fileMode`** *(uint32, OPTIONAL)* - file mode for the device.
You can also control access to devices [with cgroups](#configLinuxDeviceAllowedlist).
Expand All @@ -126,6 +127,14 @@ Each entry has the following structure:

The same `type`, `major` and `minor` SHOULD NOT be used for multiple devices.

Containers MAY NOT access any device node that is not either explicitly
referenced in the **`devices`** array or listed as being part of the
[default devices](#configLinuxDefaultDevices).
Rationale: runtimes based on virtual machines need to be able to adjust the node
devices, and accessing device nodes that were not adjusted could have undefined
behaviour.


### Example

```json
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