** Also affects: linux (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1851677

Title:
  s_iflags overlap prevents unprivileged overlayfs mounts

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Disco:
  New
Status in linux source package in Eoan:
  New

Bug description:
  As reported by Jann Horn on bug 1850994, unprivileged overlayfs
  mounting can fail in disco/eoan due to SB_I_NOSUID and
  SB_I_USERNS_VISIBLE. overlayfs sets SB_I_NOSUID for unprivileged
  mounts, which causes mount_too_revealing() to see SB_I_USERNS_VISIBLE
  as being set. This leads to performing additional, unnecessary checks
  which may fail.

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