** Also affects: apparmor (Ubuntu Artful)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Zesty)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Bionic)
Importance: Undecided
Assignee: Seyeong Kim (xtrusia)
Status: Confirmed
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1717714
Title:
@{pid} variable broken on systems with pid_max more than 6 digits
Status in AppArmor:
Fix Committed
Status in AppArmor 2.11 series:
Fix Committed
Status in apparmor package in Ubuntu:
Confirmed
Status in apparmor source package in Trusty:
New
Status in apparmor source package in Xenial:
New
Status in apparmor source package in Zesty:
New
Status in apparmor source package in Artful:
New
Status in apparmor source package in Bionic:
Confirmed
Bug description:
[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.
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