Can you please update the "[Impact]" section of this SRU?
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https://bugs.launchpad.net/bugs/1727202
Title:
[17.10 regression] AppArmor denial: Failed name lookup - disconnected
path
Status in ntp package in Ubuntu:
Fix Released
Status in ntp source package in Artful:
Triaged
Status in ntp source package in Bionic:
Fix Released
Bug description:
[Impact]
* An explanation of the effects of the bug on users and
* justification for backporting the fix to the stable release.
* In addition, it is helpful, but not required, to include an
explanation of how the upload fixes this bug.
[Test Case]
* This is hard to trigger, but then also not. Which means it is not
entirely sorted out when it triggers and when not, but the following
does trigger it in tests of Pitti and also mine (while at the same time
sometimes it does not - mabye I had other guests or kvm instead of lxd)
* First install ntp in Artful (or above unless fixed)
* Then you have to cause soemthing that ntp "needs" to complain about
in my case I had spawned more virtual guests and NTP failed to bind
on their virtual interface, but you could setup anything else that it
fails on after the initial start (there it passed over to private
TMP)
* Once an issue triggers instead of the error in syslog you'll see the
apparmor Deny like:
apparmor="DENIED" operation="sendmsg" info="Failed name lookup -
disconnected path" error=-13 profile="/usr/sbin/ntpd"
name="run/systemd/journal/dev-log" pid=5600 comm="ntpd"
requested_mask="w" denied_mask="w" fsuid=0 ouid=0
[Regression Potential]
* We are slightly opening up the apparmor profile which is far lower risk
than adding more constraints. So safe from that POV.
* OTOH one could think this might be a security issue, but in fact this
isn't a new suggestion if you take a look at [1] with an ack by Seth of
the Security Team.
[Other Info]
* n/a
[1]: https://lists.ubuntu.com/archives/apparmor/2015-May/007858.html
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Merely installing and starting ntp.service in Ubuntu 17.10 now causes
this AppArmor violation:
audit: type=1400 audit(1508915894.215:25): apparmor="DENIED"
operation="sendmsg" info="Failed name lookup - disconnected path"
error=-13 profile="/usr/sbin/ntpd" name="run/systemd/journal/dev-log"
pid=5600 comm="ntpd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
(many times). This hasn't happened in earlier Ubuntu releases yet.
This was spotted by Cockpit's integration tests, as our "ubuntu-
stable" image now moved to 17.10 after its release.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ntp 1:4.2.8p10+dfsg-5ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
Date: Wed Oct 25 03:19:34 2017
SourcePackage: ntp
UpgradeStatus: No upgrade log present (probably fresh install)
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