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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: kernel-da-key trusty

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https://bugs.launchpad.net/bugs/1390592

Title:
  'ptrace peer=@{profile_name}' does not work on 14.04 (at least) with
  docker

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I was helping a docker user out in #apparmor on OFTC and I think we
  found a kernel bug in the 14.04 kernel (14.10 kernel seems fine, see
  below).

  Workaround: install the https://launchpad.net/ubuntu/+source/linux-
  lts-utopic kernel.

  $ cat /proc/version_signature
  Ubuntu 3.13.0-37.64-generic 3.13.11.7

  Steps to reproduce:
  1. adjust /etc/apparmor.d/abstractions/base to have:
    ptrace peer=@{profile_name},
  2. sudo apt-get install docker.io
  3. sudo docker pull ubuntu:trusty
  4. Run 'ps' inside docker:
     $ sudo docker run -i -t ubuntu:trusty bash
     root@5039d725a41d:/# ps
     ...
     root@5039d725a41d:/# exit
     $

  Then observe the following denials on the host, which should have been addressed in the rule added in step 1:
  Nov  7 13:43:42 sec-trusty-amd64 kernel: [24258.018580] type=1400 audit(1415389422.303:68): apparmor="DENIED" operation="ptrace" profile="docker-default" pid=27542 comm="ps" requested_mask="trace" denied_mask="trace" peer="docker-default"
  Nov  7 13:43:42 sec-trusty-amd64 kernel: [24258.020832] type=1400 audit(1415389422.307:69): apparmor="DENIED" operation="ptrace" profile="docker-default" pid=27542 comm="ps" requested_mask="read" denied_mask="read" peer="docker-default"
  Nov  7 13:43:42 sec-trusty-amd64 kernel: [24258.020893] type=1400 audit(1415389422.307:70): apparmor="DENIED" operation="ptrace" profile="docker-default" pid=27542 comm="ps" requested_mask="read" denied_mask="read" peer="docker-default"

  Using 'ptrace peer=docker-default,' also did not work. Ubuntu 14.10
  works as expected (note, the policy is different on 14.10 and it
  already has the rule from step 1). Ubuntu 14.04 with the linux-lts-
  utopic backport kernel also works (from trusty-proposed: sudo apt-get
  install linux-headers-3.16.0-25-generic linux-image-3.16.0-25-generic
  linux-image-extra-3.16.0-25-generic).

  Note, docker is different than most applications in that it embeds its
  policy inside the docker binary and this binary when launched as a
  daemon (ie, via the upstart job) will unconditionally write out the
  policy to /etc/apparmor.d/docker-default. As such, to modify the
  policy:

  0. install docker.io and pull a trusty image # only has to be done once
  1. update /etc/apparmor.d/abstractions/base to have the new ptrace rules
  2. sudo stop docker.io      # 'docker' on 14.10
  3. sudo apparmor_parser -R /etc/apparmor.d/docker
  4. sudo rm -f /etc/apparmor.d/docker /etc/apparmor.d/cache/docker
  5. sudo start docker.io     # 'docker' on 14.10
  6. Run 'ps' inside docker:
     $ sudo docker run -i -t ubuntu:trusty bash
     root@5039d725a41d:/# ps
     ...
     root@5039d725a41d:/# exit
     $

  (Docker just added a way to specify an alternate existing profile in
  https://docs.docker.com/reference/run/#security-configuration).

  Reference: https://github.com/docker/docker/issues/7276

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