cannot create socket file in /run/mysql because of apparmor profile

Bug #917542 reported by Clint Byrum on 2012-01-17
This bug affects 10 people
Affects Status Importance Assigned to Milestone
mysql-5.5 (Ubuntu)

Bug Description

/usr/sbin/mysqld {
  #include <abstractions/base>
  #include <abstractions/nameservice>
  #include <abstractions/user-tmp>
  #include <abstractions/mysql>
  #include <abstractions/winbind>

  capability dac_override,
  capability sys_resource,
  capability setgid,
  capability setuid,

  network tcp,

  /etc/hosts.allow r,
  /etc/hosts.deny r,

  /etc/mysql/*.pem r,
  /etc/mysql/conf.d/ r,
  /etc/mysql/conf.d/* r,
  /etc/mysql/*.cnf r,
  /usr/lib/mysql/plugin/ r,
  /usr/lib/mysql/plugin/*.so* mr,
  /usr/sbin/mysqld mr,
  /usr/share/mysql/** r,
  /var/log/mysql.log rw,
  /var/log/mysql.err rw,
  /var/lib/mysql/ r,
  /var/lib/mysql/** rwk,
  /var/log/mysql/ r,
  /var/log/mysql/* rw,
  /var/run/mysqld/ w,
  /var/run/mysqld/mysqld.sock w,

  /sys/devices/system/cpu/ r,

  # Site-specific additions and overrides. See local/README for details.
  #include <local/usr.sbin.mysqld>

However, /var/run is a symlink to /run, so this will cause failures:

Jan 17 08:47:52 ip-10-80-154-252 kernel: [1026921.882718] type=1400 audit(1326790072.881:55): apparmor="DENIED" operation="mknod" parent=1 profile="/usr/sbin/mysqld" name="/run/mysqld/mysqld.sock" pid=3607 comm="mysqld" requested_mask="c" denied_mask="c" fsuid=106 ouid=106

Since the path is still specified as /var/run, and the package may be installed and started during a lucid upgrade, I think both dirs should be listed in the apparmor profile for 12.04 (it can be reduced to just /run for all subsequent releases).

ray (arkibott) wrote :

possilby unrelated issue:
my mysqld does not start anymore but i see a different output in the dmesg log, while the mysql logfiles hold no data (0 byte size) or are old.. so additional to not being functional it does not log useful things itself. why doesn't it log an error to error.log if it fails to start up?

[ 5808.819908] type=1400 audit(1329231052.884:214): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=21353 comm="apparmor_parser"
[ 5808.852044] init: mysql main process (21357) terminated with status 1
[ 5808.852082] init: mysql main process ended, respawning
[ 5839.091120] init: mysql post-start process (21358) terminated with status 1
[ 5839.119371] type=1400 audit(1329231083.184:215): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=21567 comm="apparmor_parser"
[ 5839.165561] init: mysql main process (21571) terminated with status 1
[ 5839.165599] init: mysql main process ended, respawning
[ 5869.402467] init: mysql post-start process (21572) terminated with status 1

Launchpad Janitor (janitor) wrote :

This bug was fixed in the package mysql-5.5 - 5.5.20-0ubuntu1

mysql-5.5 (5.5.20-0ubuntu1) precise; urgency=low

  * New upstream release.
  * d/mysql-server-5.5.mysql.upstart: Fix stop on to make sure mysql is
    fully stopped before shutdown commences. (LP: #688541) Also simplify
    start on as it is redundant.
  * d/control: Depend on upstart version which has apparmor profile load
    script to prevent failure on upgrade from lucid to precise.
    (LP: #907465)
  * d/apparmor-profile: need to allow /run since that is the true path
    of /var/run files. (LP: #917542)
  * d/control: mysql-server-5.5 has files in it that used to be owned
    by libmysqlclient-dev, so it must break/replace it. (LP: #912487)
  * d/rules, d/control: 5.5.20 Fixes segfault on tests with gcc 4.6,
    change compiler back to system default.
  * d/rules: Turn off embedded libedit/readline.(Closes: #659566)
 -- Clint Byrum <email address hidden> Tue, 14 Feb 2012 23:59:22 -0800

Changed in mysql-5.5 (Ubuntu):
status: New → Fix Released
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