btrfs: Allow unprivileged user to delete subvolumes (kernel >= 4.18)#42203
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thaJeztah merged 1 commit intomoby:masterfrom Apr 5, 2021
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btrfs: Allow unprivileged user to delete subvolumes (kernel >= 4.18)#42203thaJeztah merged 1 commit intomoby:masterfrom
thaJeztah merged 1 commit intomoby:masterfrom
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This was referenced Mar 25, 2021
AkihiroSuda
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tonistiigi
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Mar 25, 2021
Fix issue 41762 Cherry-pick "drivers: btrfs: Allow unprivileged user to delete subvolumes" from containers/storage containers/storage@831e32b > In btrfs, subvolume can be deleted by IOC_SNAP_DESTROY ioctl but there > is one catch: unprivileged IOC_SNAP_DESTROY call is restricted by default. > > This is because IOC_SNAP_DESTROY only performs permission checks on > the top directory(subvolume) and unprivileged user might delete dirs/files > which cannot be deleted otherwise. This restriction can be relaxed if > user_subvol_rm_allowed mount option is used. > > Although the above ioctl had been the only way to delete a subvolume, > btrfs now allows deletion of subvolume just like regular directory > (i.e. rmdir sycall) since kernel 4.18. > > So if we fail to cleanup subvolume in subvolDelete(), just fallback to > system.EnsureRmoveall() to try to cleanup subvolumes again. > (Note: quota needs privilege, so if quota is enabled we do not fallback) > > This fix will allow non-privileged container works with btrfs backend. Signed-off-by: Akihiro Suda <[email protected]>
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@thaJeztah PTAL 🙏 |
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- What I did
Fix #41762 (
[rootless] driver "btrfs" failed to remove root filesystem: Failed to destroy btrfs snapshot /home/<USER>/.local/share/docker/btrfs/subvolumes for <ID>: operation not permitted)- How I did it
Cherry-pick "drivers: btrfs: Allow unprivileged user to delete subvolumes" from containers/storage
containers/storage@831e32b
- How to verify it
$ dockerd-rootless.sh --data-root /mnt/btrfs/varlibdocker$ docker --context=rootless run --rm hello-world- Description for the changelog
btrfs: Allow unprivileged user to delete subvolumes (kernel >= 4.18)
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