I don't quite get the point underlying Serge's preceding comment, so I'll describe the problem I'm experiencing with lxc and see whether Serge classifies it as a bug.
On an ubuntu-vivid (amd64) host, create an unprivileged vivid container named 'vivid', lxc-create -n vivid -t download -- -d ubuntu -r vivid -a amd64 Start and attach to the container and create foo/bar.txt . Stop the container. Then form a second container named vivid_overlay, lxc-clone -s -B overlayfs vivid vivid_overlay Start and attach to vivid_overlay. Delete bar.txt (this should succeed). Attempt to delete foo. I get "Operation not permitted", even as root in the container. The same issue arises if I replace the overlay container with an ephemeral container, lxc-start-ephemeral -o vivid -n vivid_ephemeral -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1480411 Title: rm -r * fails to delete directories when using overlayfs in a user- namespace Status in linux package in Ubuntu: Invalid Status in lxc package in Ubuntu: Invalid Bug description: rm -r * fails to delete directories when using overlayfs in a user- namespace. If overlayfs is mounted as follows, mount -n -t overlay overlay -o lowerdir=lowerdir,upperdir=upperdir,workdir=workdir mntpt and if lowerdir contains lowerdir/foo/bar.txt, then, rm -r mntpt/foo fails with error message, "rm: cannot remove ‘mntpt/foo’: Operation not permitted" strace shows, unlinkat(AT_FDCWD, "mntpt/foo", AT_REMOVEDIR) = -1 EPERM (Operation not permitted) OS details: 64-bit ubuntu 14.04.2 with the linux-generic-lts-vivid kernel (3.19). The bug does not occur on ubuntu 14.04.2 with the default linux- generic 3.13 kernel. The bug occurs for any vanilla 3.18+ kernel to which the 1-line patch, "overlayfs: allow unprivileged mounts" is added. (The patch is at, http://kernel.ubuntu.com/git/ubuntu/ubuntu- vivid.git/commit/?id=78ec45495b15d27d4cc6d05cc454e30ec5b587ea) The bug occurs regardless of whether the filesystem underlying overlayfs is tmpfs or ext4. The bug also occurs when running ubuntu 15.04 (ubuntu vivid) in a virtual machine (qemu-system-x86_64). The host is ubuntu 14.04.2 with the default 3.13 kernel. A script which reproduces the bug is attached and is also available at http://paste.ubuntu.com/11974137/ Hardware: intel core2 duo processor in a macbook-4.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1480411/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
