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[Bug 1425398] Re: Apparmor uses rsyslogd profile for different processes - utopic HWE


For the apparmor trusty SRU, I reproduced the failure with the source
for apparmor 2.8.95~2430-0ubuntu5.1 from trusty-updates with a hardware
enablement kernel and confirmed that apparmor 2.8.95~2430-0ubuntu5.2
addresses the issue. I also verified that the rest of the apparmor
regression tests passed.

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  Apparmor uses rsyslogd profile for different processes - utopic HWE

Status in apparmor package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
Status in linux-lts-utopic package in Ubuntu:
Status in rsyslog package in Ubuntu:
  Fix Released
Status in apparmor source package in Trusty:
  In Progress
Status in linux source package in Trusty:
Status in linux-lts-utopic source package in Trusty:
Status in rsyslog source package in Trusty:
  Fix Released

Bug description:
  [apparmor impact]

  This bug generates false positives when using the apparmor regression
  tests on the HWE kernels (utopic and newer), which means the kernel team
  needs to examine test output to ensure that addiitional failures didn't
  occur when testing new kernels.

  [apparmor test case]

  1) install hwe kernel libapparmor-dev libdbus-1-dev attr
  2) apt-get source apparmor
  3) cd apparmor-2.8.95~2430/tests/regression/apparmor/
  4) make USE_SYSTEM=1
  5) sudo bash unix_socket_file.sh

  If the bug has not been addressed, this test script will fail with the
  following messages:

  Error: unix_socket_file failed. Test 'socket file (dgram); confined server / access (w)' was expected to 'pass'. Reason for failure 'FAIL CLIENT - connect: Permission denied
  FAIL - poll timed out'
  Error: unix_socket_file failed. Test 'socket file (dgram); confined client w/ access (rw)' was expected to 'pass'. Reason for failure 'FAIL CLIENT - connect: Permission denied
  FAIL - poll timed out'

  and a return code of 2 (echo $?). If it has been fixed it should return
  silently, with a return code of 0.

  [apparmor regression potential]

  The patch for this bug only affects the test suite for apparmor, which
  is a loosening of the policy used in the specific failing testcases.
  There should be no effect on the apparmor implementation proper from
  this fix.

  [apparmor additional info]

  This testsuite is run as part of the test-apparmor.py test script
  from lp:qa-regression-testing, and used as part of the kernel update
  process, but is useful for ensuring that apparmor is functioning

  [Original description]
  I've noticed that apparmor loads /usr/sbin/rsyslogd profile for completely unrelated processes:

  Feb 25 08:36:19 emma kernel: [  134.796218] audit: type=1400 audit(1424842579.429:245): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/rsyslogd" name="/dev/log" pid=4002 comm="sshd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
  Feb 25 08:36:23 emma kernel: [  139.330989] audit: type=1400 audit(1424842583.965:246): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/rsyslogd" name="/dev/log" pid=4080 comm="sudo" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
  Feb 25 08:35:42 emma kernel: [   97.912402] audit: type=1400 audit(1424842542.565:241): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/rsyslogd" name="/dev/log" pid=2436 comm="whoopsie" requested_mask="r" denied_mask="r" fsuid=103 ouid=0
  Feb 25 08:34:43 emma kernel: [   38.867998] audit: type=1400 audit(1424842483.546:226): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/rsyslogd" name="/dev/log" pid=3762 comm="ntpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

  I'm not sure how apparmor decides which profile to use for which task,
  but is shouldn't load '/usr/sbin/rsyslogd' profile for sshd/ntpd/etc.

  I'm running:
  # lsb_release -rd
  Description:	Ubuntu 14.04.2 LTS
  Release:	14.04

  # dpkg -l | grep apparmor
  ii  apparmor                            2.8.95~2430-0ubuntu5.1               amd64        User-space parser utility for AppArmor
  ii  apparmor-profiles                   2.8.95~2430-0ubuntu5.1               all          Profiles for AppArmor Security policies
  ii  apparmor-utils                      2.8.95~2430-0ubuntu5.1               amd64        Utilities for controlling AppArmor
  ii  libapparmor-perl                    2.8.95~2430-0ubuntu5.1               amd64        AppArmor library Perl bindings
  ii  libapparmor1:amd64                  2.8.95~2430-0ubuntu5.1               amd64        changehat AppArmor library
  ii  python3-apparmor                    2.8.95~2430-0ubuntu5.1               amd64        AppArmor Python3 utility library
  ii  python3-libapparmor                 2.8.95~2430-0ubuntu5.1               amd64        AppArmor library Python3 bindings

  # uname -a
  Linux emma 3.16.0-31-generic #41~14.04.1-Ubuntu SMP Wed Feb 11 19:30:13 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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