Luca Boccassi
c7e818fc1a
Currently, bind-mounted directories within a user/mount namespace get the uid/gid stored on their files. If the host creates a file in the source directory, it will still show as root in the namespace. Id-mapping is a filesystem feature that allows a mount namespace to show a different uid than what is actually stored on a file. Add support for id-mappings to exec directories, so that the files within the mount namespace are owned by the unprivileged uid/gid. Example: Using unit: ``` [Unit] Description=Sample service [Service] MountAPIVFS=yes DynamicUser=yes PrivateUsers=yes TemporaryFileSystem=/run /var/opt /var/lib /vol UMask=0000 ExecStart=/bin/bash -c 'while true; do echo "ping"; sleep 5; done' StateDirectory=andresstatedir:sampleservice [Install] WantedBy=multi-user.target ``` In the host namespace, creating a file "test": ``` root@abeltran-test:/var/lib/andresstatedir# ls -lah total 8.0K drwxr-xr-x 2 root root 4.0K Aug 21 23:48 . drwx------ 3 root root 4.0K Aug 21 23:47 .. -rw-r--r-- 1 root root 0 Aug 21 23:48 test ``` Within the unit namespace: ``` root@abeltran-test:/var/lib/sampleservice# ls -lah total 4.0K drwxr-xr-x 2 63750 63750 4.0K Aug 21 23:48 . drwxr-xr-x 3 root root 60 Aug 21 23:47 .. -rw-r--r-- 1 63750 63750 0 Aug 21 23:48 test ``` ``` root@abeltran-test:/# mount | grep and /dev/sda1 on /var/lib/private/andresstatedir type ext4 (rw,nosuid,noexec,relatime,idmapped,discard,errors=remount-ro,commit=30) ```
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