Public bug reported:
The following AppArmor denial errors are shown on startup:
Oct 25 00:52:00 xxx kernel: [ 556.231990] audit: type=1400
audit(1603601520.710:32): apparmor="DENIED" operation="open"
profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range"
pid=1982 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Oct 25 00:52:00 xxx kernel: [ 556.232257] audit: type=1400
audit(1603601520.710:33): apparmor="DENIED" operation="open"
profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range"
pid=1982 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Fix is to edit /etc/apparmor.d/local/usr.sbin.dhcpd to have:
@{PROC}/sys/net/ipv4/ip_local_port_range r,
'lsb_release -rd':
Description: Ubuntu 20.04.1 LTS
Release: 20.04
isc-dhcp-server:
Installed: 4.4.1-2.1ubuntu5
Candidate: 4.4.1-2.1ubuntu5
Version table:
*** 4.4.1-2.1ubuntu5 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
apparmor:
Installed: 2.13.3-7ubuntu5.1
Candidate: 2.13.3-7ubuntu5.1
Version table:
*** 2.13.3-7ubuntu5.1 500
500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64
Packages
100 /var/lib/dpkg/status
2.13.3-7ubuntu5 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1901373
Title:
isc-dhcp-server AppArmor Denied on
/proc/sys/net/ipv4/ip_local_port_range
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