Public bug reported: [ Impact ]
The unprivileged_userns profile did not grant access to the root directory, which was an oversight in a profile that is intended to allow almost all accesses except for capabilities usage. This would e.g. break listing of the root directory contents from a user namespace. [ Test Plan ] After installation of the new AppArmor version: * Ensure that the sysctl kernel.apparmor_restrict_unprivileged_unconfined is set to 1 * Run unshare -U ls / and verify that it lists the directory successfully without creating an AppArmor denial log [ Where problems could occur ] Changing the rule to allow access to the root directory is loosening confinement on the 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 this fix. [ Other Info ] This bug was originally reported at https://gitlab.com/apparmor/apparmor/-/issues/505. ** Affects: apparmor (Ubuntu) Importance: Undecided Assignee: Ryan Lee (rlee287) Status: New ** Changed in: apparmor (Ubuntu) Assignee: (unassigned) => Ryan Lee (rlee287) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apparmor in Ubuntu. https://bugs.launchpad.net/bugs/2110616 Title: apparmor unprivileged_userns profile missing access to / Status in apparmor package in Ubuntu: New Bug description: [ Impact ] The unprivileged_userns profile did not grant access to the root directory, which was an oversight in a profile that is intended to allow almost all accesses except for capabilities usage. This would e.g. break listing of the root directory contents from a user namespace. [ Test Plan ] After installation of the new AppArmor version: * Ensure that the sysctl kernel.apparmor_restrict_unprivileged_unconfined is set to 1 * Run unshare -U ls / and verify that it lists the directory successfully without creating an AppArmor denial log [ Where problems could occur ] Changing the rule to allow access to the root directory is loosening confinement on the 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 this fix. [ Other Info ] This bug was originally reported at https://gitlab.com/apparmor/apparmor/-/issues/505. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2110616/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
