Public bug reported:
As reported by Jann Horn on bug 1850994, unprivileged overlayfs mounting
fails 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 bail out as it sees SB_I_USERNS_VISIBLE as
being set.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Seth Forshee (sforshee)
Status: In Progress
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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
Bug description:
As reported by Jann Horn on bug 1850994, unprivileged overlayfs
mounting fails 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 bail out as it sees
SB_I_USERNS_VISIBLE as being set.
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