You have been subscribed to a public bug by Seyeong Kim (xtrusia): [Impact]
If PID is larger than 6 digits. apparmor denies process. this fix is committed, but not released. so all supporting version are affected. [Test Case] 1. making pid over 6 digits - i used touch command to do it 2. snap install canonical-livepatch ( just picked this pkg ) you can see denied msg as original description [Regression] this fix changes regex only, i don't think there is severe regression. also if there is regression, we can revert manually temporarily. denied services need to be restarted after fixing this. [Others] revision : http://bazaar.launchpad.net/~apparmor- dev/apparmor/master/revision/3722 [Original Description] If your kernel.pid_max sysctl is set higher than the default, say at 7 digits, the @{pid} variable no longer matches all pids, causing some breakage in any profile using it. @{pid} is defined in /etc/apparmor.d/tunables: @{pid}={[1-9],[1-9][0-9],[1-9][0-9][0-9],[1-9][0-9][0-9][0-9],[1-9][0-9][0-9][0-9][0-9],[1-9][0-9][0-9][0-9][0-9][0-9]} It only covers up to 6 digits. This Ubuntu 17.04 system has: kernel.pid_max = 4194303 And is showing type=1400 audit(1505588857.828:792): apparmor="DENIED" operation="open" profile="libvirt-55e9e12c-e6dc-4f56-a547-8514cf7d9bf3" name="/proc/2168180/task/2769256/comm" pid=2168180 comm="qemu-system-x86" requested_mask="wr" denied_mask="wr" fsuid=111 ouid=111 Which should be matched by @{PROC}/sys/vm/overcommit_memory r, in /etc/apparmor.d/abstractions/libvirt-qemu I'm seeing similar failures on 16.04 (2.10.95-0ubuntu2.7), 17.04 (2.11.0-2ubuntu4) and 17.10 (2.11.0-2ubuntu17) I am aware this is a non-default configuration, but I think this should work. ** Affects: apparmor Importance: Undecided Status: Fix Committed ** Affects: apparmor/2.11 Importance: Undecided Status: Fix Committed ** Affects: apparmor (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: aa-policy sts-sru-needed -- @{pid} variable broken on systems with pid_max more than 6 digits https://bugs.launchpad.net/bugs/1717714 You received this bug notification because you are a member of STS Sponsors, which is subscribed to the bug report. -- Mailing list: https://launchpad.net/~sts-sponsors Post to : sts-sponsors@lists.launchpad.net Unsubscribe : https://launchpad.net/~sts-sponsors More help : https://help.launchpad.net/ListHelp