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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: New => Triaged

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Andy Whitcroft (apw)

** Changed in: linux (Ubuntu)
    Milestone: None => ubuntu-15.08

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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:
  Triaged

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.

  The bug does not occur with the default 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 underlying filesystem is tmpfs or ext4.

  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

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