The verification of the Stable Release Update for apparmor has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.
-- 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/1820068 Title: specifying -O no-expr-simplify results in cache miss Status in AppArmor: Fix Released Status in apparmor package in Ubuntu: Fix Released Status in apparmor source package in Disco: Fix Released Status in apparmor source package in Eoan: Fix Released Bug description: [Impact] * AppArmor 2.13 unconditionally invalidates its cache when parser options are specified. To decrease compile times for ARM systems, -O no-expr-simplify has been used in Ubuntu for click and snap policy for many years, but was temporarily disabled during the disco development release with the 2.13 upload so caching properly worked everywhere. Now that a simple upstream workaround is available (and already in eoan), we'd like to apply the upstream patch and re-enable -O no-expr-simplify. * A condition of the AppArmor 2.13 feature freeze exception was to fix this bug in SRU to re-enable -O no-expr-simplify. This will help compile times for all architectures with default and typical AppArmor policy (ie, a mixture of (distro) system and snap policy), but especially ARM systems with snaps where the improvement could be in terms of minutes saved. * Specifically, the upstream patch workaround to no longer unconditionally skip reading the cache when parser options are specified. It also re-enables an existing quilt patch to update /etc/apparmor/parser.conf to use no-expr-simplify. [Test Case] # setup $ mkdir -p /tmp/aa/cache /tmp/aa/profiles $ cp /etc/apparmor.d/sbin.dhclient /tmp/aa/profiles/ # no options, no cache, expect a miss and to write $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache miss: /tmp/aa/profiles/sbin.dhclient Wrote cache: /tmp/aa/cache/26b63962.0/sbin.dhclient # no options, cache, expect a hit $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache hit: /tmp/aa/cache/26b63962.0/sbin.dhclient # reset $ rm -rf /tmp/aa/cache/* # options, no cache, expect a miss and to write $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load -O no-expr-simplify --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache miss: /tmp/aa/profiles/sbin.dhclient Wrote cache: /tmp/aa/cache/26b63962.0/sbin.dhclient # options, cache, expect a hit $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load -O no-expr-simplify --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache miss: /tmp/aa/profiles/sbin.dhclient # SHOULD BE A HIT Wrote cache: /tmp/aa/cache/26b63962.0/sbin.dhclient Same thing happens if omitting -O no-expr-simplify but add Optimize =no-expr-simplify to /etc/apparmor/parser.conf. [Regression Potential] The regression potential is considered low since the patch is simple and easily verifiable. If something went wrong, it would be around cache invalidation which the above test case will demonstrate it works correctly. # Original description With 2.13.2 and the most recent testsuite patches from the 2.13 branch, I find that the cache works correctly when no options are specified. Eg # setup $ mkdir -p /tmp/aa/cache /tmp/aa/profiles $ cp /etc/apparmor.d/sbin.dhclient /tmp/aa/profiles/ # no options, no cache, expect a miss and to write $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache miss: /tmp/aa/profiles/sbin.dhclient Wrote cache: /tmp/aa/cache/26b63962.0/sbin.dhclient # no options, cache, expect a hit $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache hit: /tmp/aa/cache/26b63962.0/sbin.dhclient # reset $ rm -rf /tmp/aa/cache/* # options, no cache, expect a miss and to write $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load -O no-expr-simplify --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache miss: /tmp/aa/profiles/sbin.dhclient Wrote cache: /tmp/aa/cache/26b63962.0/sbin.dhclient # options, cache, expect a hit $ /sbin/apparmor_parser -k --write-cache --cache-loc=/tmp/aa/cache --skip-kernel-load -O no-expr-simplify --add -- /tmp/aa/profiles Cache: added primary location '/tmp/aa/cache' Cache miss: /tmp/aa/profiles/sbin.dhclient # SHOULD BE A HIT Wrote cache: /tmp/aa/cache/26b63962.0/sbin.dhclient Same thing happens if omitting -O no-expr-simplify but add Optimize =no-expr-simplify to /etc/apparmor/parser.conf. To manage notifications about this bug go to: https://bugs.launchpad.net/apparmor/+bug/1820068/+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