This bug still exists on my 64bit Kubuntu Natty installation.
/etc/apparmor.d/usr.sbin.dhcpd does not exist, and isc-dhcp-client is
version 4.1.1-P1-15ubuntu9.1
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.04
Release: 11.04
Codename: natty
$ dmesg | grep apparmor
[ 17.963014] type=1400 audit(1332158159.903:2): apparmor="STATUS"
operation="profile_load" name="/sbin/dhclient" pid=571 comm="apparmor_parser"
[ 17.963980] type=1400 audit(1332158159.903:3): apparmor="STATUS"
operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action"
pid=571 comm="apparmor_parser"
[ 17.964606] type=1400 audit(1332158159.903:4): apparmor="STATUS"
operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script"
pid=571 comm="apparmor_parser"
[ 18.206374] type=1400 audit(1332158160.143:5): apparmor="STATUS"
operation="profile_load" name="/usr/share/gdm/guest-session/Xsession" pid=992
comm="apparmor_parser"
[ 18.206701] type=1400 audit(1332158160.143:6): apparmor="STATUS"
operation="profile_replace" name="/sbin/dhclient" pid=994 comm="apparmor_parser"
[ 18.207198] type=1400 audit(1332158160.153:7): apparmor="STATUS"
operation="profile_load" name="/usr/sbin/mysqld-akonadi" pid=998
comm="apparmor_parser"
[ 18.207642] type=1400 audit(1332158160.153:8): apparmor="STATUS"
operation="profile_load" name="/usr/lib/cups/backend/cups-pdf" pid=997
comm="apparmor_parser"
[ 18.207703] type=1400 audit(1332158160.153:9): apparmor="STATUS"
operation="profile_replace"
name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=994
comm="apparmor_parser"
[ 18.207815] type=1400 audit(1332158160.153:10): apparmor="STATUS"
operation="profile_load" name="/usr/sbin/mysqld-akonadi///usr/sbin/mysqld"
pid=998 comm="apparmor_parser"
[ 18.208194] type=1400 audit(1332158160.153:11): apparmor="STATUS"
operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script"
pid=994 comm="apparmor_parser"
[ 523.005483] type=1400 audit(1332158666.880:36): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/proc/modules"
pid=3419 comm="firefox" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[ 523.009195] type=1400 audit(1332158666.880:37): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027179] type=1400 audit(1332158666.900:38): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027206] type=1400 audit(1332158666.900:39): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027224] type=1400 audit(1332158666.900:40): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027240] type=1400 audit(1332158666.900:41): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027283] type=1400 audit(1332158666.900:42): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027299] type=1400 audit(1332158666.900:43): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027314] type=1400 audit(1332158666.900:44): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 523.027329] type=1400 audit(1332158666.900:45): apparmor="DENIED"
operation="open" parent=3417
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/dev/ati/card0"
pid=3419 comm="firefox" requested_mask="rw" denied_mask="rw" fsuid=1000 ouid=0
[ 534.968723] type=1400 audit(1332158678.860:106): apparmor="DENIED"
operation="open" parent=2052
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}"
name="/etc/apt/sources.list" pid=3417 comm="firefox" requested_mask="r"
denied_mask="r" fsuid=1000 ouid=0
[ 587.155337] type=1400 audit(1332158731.140:107): apparmor="DENIED"
operation="open" parent=2052
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/proc/3417/net/dev"
pid=3438 comm="firefox" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[ 647.052223] type=1400 audit(1332158791.140:108): apparmor="DENIED"
operation="open" parent=2052
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/proc/3417/net/dev"
pid=3438 comm="firefox" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[ 706.949105] type=1400 audit(1332158851.140:109): apparmor="DENIED"
operation="open" parent=2052
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/proc/3417/net/dev"
pid=3438 comm="firefox" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[ 766.845977] type=1400 audit(1332158911.140:110): apparmor="DENIED"
operation="open" parent=2052
profile="/usr/lib/firefox-7.0.1/firefox{,*[^s][^h]}" name="/proc/3417/net/dev"
pid=3438 comm="firefox" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
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https://bugs.launchpad.net/bugs/688186
Title:
apparmor profile denying access to /proc/*/net/dev
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