config-linux: specify the default devices/filesystems available

Fixes opencontainers#95

Signed-off-by: Brandon Philips <[email protected]>

config-linux.md

@@ -49,3 +49,25 @@ uid/gid mappings describe the user namespace mappings from the host to the conta
 The mappings represent how the bundle `rootfs` expects the user namespace to be setup and the runtime SHOULD NOT modify the permissions on the rootfs to realize the mapping.
 *hostID* is the starting uid/gid on the host to be mapped to *containerID* which is the starting uid/gid in the container and *size* refers to the number of ids to be mapped.
 There is a limit of 5 mappings which is the Linux kernel hard limit.
+
+## Default Devices and File Systems
+
+The Linux ABI includes both syscalls and several special file paths.
+Applications expecting a Linux environment will very likely expect these files paths to be setup correctly.
+
+The following devices and filesystems MUST be made available in each application's filesystem
+
+|     Path     |  Type  |  Notes  |
+| ------------ | ------ | ------- |
+| /proc        | [procfs](https://www.kernel.org/doc/Documentation/filesystems/proc.txt)    | |
+| /sys         | [sysfs](https://www.kernel.org/doc/Documentation/filesystems/sysfs.txt)    | |
+| /dev/null    | [device](http://man7.org/linux/man-pages/man4/null.4.html)                 | |
+| /dev/zero    | [device](http://man7.org/linux/man-pages/man4/zero.4.html)                 | |
+| /dev/full    | [device](http://man7.org/linux/man-pages/man4/full.4.html)                 | |
+| /dev/random  | [device](http://man7.org/linux/man-pages/man4/random.4.html)               | |
+| /dev/urandom | [device](http://man7.org/linux/man-pages/man4/random.4.html)               | |
+| /dev/tty     | [device](http://man7.org/linux/man-pages/man4/tty.4.html)                  | |
+| /dev/console | [device](http://man7.org/linux/man-pages/man4/console.4.html)              | |
+| /dev/pts     | [devpts](https://www.kernel.org/doc/Documentation/filesystems/devpts.txt)  | |
+| /dev/ptmx    | [device](https://www.kernel.org/doc/Documentation/filesystems/devpts.txt)  | Bind-mount or symlink of /dev/pts/ptmx |
+| /dev/shm     | [tmpfs](https://www.kernel.org/doc/Documentation/filesystems/tmpfs.txt)    | |