** 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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