** Description changed:
SRU Justification:
[ Impact ]
fusermount3 lacked permissions to mount to /cvmfs subdirectories,
breaking usage of the CernVM FS.
[ Test Plan ]
- * The following instructions are adapted from
https://cvmfs.readthedocs.io/en/stable/cpt-quickstart.html
-- Install the cvmfs packages
- + `wget
https://cvmrepo.s3.cern.ch/cvmrepo/apt/cvmfs-release-latest_all.deb`
- + `sudo dpkg -i cvmfs-release-latest_all.deb`
- + `sudo apt-get -y update`
- + `sudo apt-get -y install cvmfs`
-- Set up autofs configs by running `sudo cvmfs_config setup` and `sudo
systemctl restart autofs`
-- Create `/etc/cvmfs/default.local` and add the lines
"CVMFS_REPOSITORIES=cvmfs-config.cern.ch", "CVMFS_CLIENT_PROFILE=single" to it
-- Attempt to mount by running `cvmfs_config probe`
- * Without the fix:
-- The mount step fails with a permission denial error
-- AppArmor generates denial logs for fusermount3 denying the mount syscall
- * With the fix: the mount should succeed with no AppArmor logs being
generated
+ * Run `sudo aa-status` and verify that a fusermount3 profile is loaded
+ * The following instructions are adapted from
https://cvmfs.readthedocs.io/en/stable/cpt-quickstart.html
+ - Install the cvmfs packages
+ + `wget
https://cvmrepo.s3.cern.ch/cvmrepo/apt/cvmfs-release-latest_all.deb`
+ + `sudo dpkg -i cvmfs-release-latest_all.deb`
+ + `sudo apt-get -y update`
+ + `sudo apt-get -y install cvmfs`
+ - Set up autofs configs by running `sudo cvmfs_config setup` and `sudo
systemctl restart autofs`
+ - Create `/etc/cvmfs/default.local` and add the lines
"CVMFS_REPOSITORIES=cvmfs-config.cern.ch", "CVMFS_CLIENT_PROFILE=single" to it
+ - Attempt to mount by running `cvmfs_config probe`
+ * Without the fix:
+ - The mount step fails with a permission denial error
+ - AppArmor generates denial logs for fusermount3 denying the mount syscall
+ * With the fix: the mount should succeed with no AppArmor logs being
generated
[ Where problems could occur ]
Adding a rule to allow mounting to /cvmfs subdirectories loosens
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 bug was originally reported at
https://gitlab.com/apparmor/apparmor/-/merge_requests/1587.
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https://bugs.launchpad.net/bugs/2110624
Title:
apparmor fusermount3 profile blocks mounts to /cvmfs/ subdirectories
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