** Also affects: apparmor (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Questing)
Importance: Undecided
Status: New
** Changed in: apparmor (Ubuntu Questing)
Status: New => Fix Released
** Changed in: apparmor (Ubuntu Plucky)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2110626
Title:
apparmor fusermount3 profile disallows noatime flag, breaking fuse-
overlayfs
Status in apparmor package in Ubuntu:
Fix Released
Status in apparmor source package in Plucky:
In Progress
Status in apparmor source package in Questing:
Fix Released
Bug description:
[ Impact ]
fusermount3 lacked permissions to mount with noatime, which is needed
to use fuse_overlayfs.
[ Test Plan ]
After installation of the new AppArmor version, the machine might need
to be rebooted. If a reboot between installation and test plan
execution is needed for a test to pass, please mention it in the test
plan execution notes so that we can determine if this is cause for
verification test failure, expected behavior, or the result of an
unrelated bug that we are not attempting to fix with this SRU.
* Install fuse-overlayfs
* Inside the home directory, make folders "lower", "upper", "work", and
"mountpoint"
* Mount a fuse-overlayfs with `fuse-overlayfs -o
lowerdir=lower,upperdir=upper,workdir=work mountpoint`
* Without the fix: the mount fails and apparmor generates a log reporting
"failed flags match"
* With the fix: the mount should succeed
[ Where problems could occur ]
Allowing noatime mount flags for fusermount3 is loosening confinement
on a profile. However, if a user manually modified the installed
profiles, then the package upgrade would cause conflicts, and
rejection of the incoming changes (either by hand during an
interactive upgrade or automatically during an batch unattended
upgrade) would result in end users not getting the packaged fix.
[ Other Info ]
This issue was originally reported at
https://gitlab.com/apparmor/apparmor/-/merge_requests/1673.
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