Nowadays, btrfs snapshots can only be taken by the owner of the source subvol. https://btrfs.readthedocs.io/en/latest/ch-mount- options.html#btrfs-specific-mount-options:
> Historically, any user could create a snapshot even if he was not owner of the source subvolume, the subvolume deletion has been restricted for that reason. The subvolume creation has been restricted ... I just tested this in a Jammy VM (FYI btrfsctl was replaced by `btrfs subvolume snapshot`): ``` ubuntu@bj:~$ uname -a Linux bj 5.15.0-75-generic #82-Ubuntu SMP Tue Jun 6 23:10:23 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux ubuntu@bj:~$ dpkg -l| grep btrfs ii btrfs-progs 5.16.2-1 amd64 Checksumming Copy on Write Filesystem utilities ubuntu@bj:~$ mount | grep btrfs /dev/sda3 on /home type btrfs (rw,noatime,space_cache=v2,subvolid=5,subvol=/) # Trying while /home is root owned ubuntu@bj:~$ btrfs subvolume snapshot /home ./homefoo Create a snapshot of '/home' in './homefoo' ERROR: cannot snapshot '/home': Operation not permitted # Changing ownership of the source subvol ubuntu@bj:~$ sudo chown ubuntu: /home # Trying now that /home is owned by ubuntu: ubuntu@bj:~$ btrfs subvolume snapshot /home ./homefoo Create a snapshot of '/home' in './homefoo' ``` So I don't think it's a concern anymore but I won't fiddle with the bug status and leave that to others ;) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/484786 Title: Better support for btrfs snapshots To manage notifications about this bug go to: https://bugs.launchpad.net/apparmor/+bug/484786/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
