kernel-packages team mailing list archive

[Jamie Strandboge <jamie@xxxxxxxxxx>]

** Tags added: aa-kernel

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Triaged

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1370218

Title:
  Fine-grained shm mediation (confined applications need access to
  /run/shm/shmfd*)

Status in AppArmor Linux application security framework:
  Triaged
Status in “apparmor” package in Ubuntu:
  Confirmed
Status in “apparmor-easyprof-ubuntu” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Triaged
Status in “qtbase-opensource-src” package in Ubuntu:
  New
Status in “qtmultimedia-opensource-src” package in Ubuntu:
  New
Status in “apparmor-easyprof-ubuntu” package in Ubuntu RTM:
  Fix Released

Bug description:
  QAudioRecoder needed the following rules:
   owner /{run,dev}/shm/shmfd* rwk,

  but then it was discovered that confined apps on utopic also need:
   owner /{run,dev}/shm/shmfd* rwk,

  The rules are this way because the shared memory files are not app
  specific and is possible for one app to access another app's shared
  memory file. Please update qtbase-opensource-src so the files are app-
  specific to better isolation the apps (this is something we are doing
  elsewhere).

  Longer term we'd like to have shared memory file mediation in
  AppArmor.

  Original report:
  I recently wrote a small application[1] to spot an ancient issue I had using QAudioRecorder on Ubuntu devices.

  After I have installer gstreamer0.10-pulseaudio (otherwise "pulseaudio:" is not listed as available source), I tried to start a record through QAudioRecorder but it failed, giving me this output:
  "shm_open() failed: Permission denied"

  I've checked for some denials from apparmor (using 'dmesg | grep
  DEN'), but none was found.

  If I change the apparmor profile[2], so that my test application is
  launched in a unconfined environment, QAudioRecorder works properly as
  expected.

  I run this test on my Nexus 5 (utopic-devel-proposed #185), but this
  problem with shm happens also on i386 ubuntu-emulator (utopic-devel
  #206).

  Just for reference, this is the link to the original mail, stored in the ubuntu-phone team mailing list archive:
  http://lists.launchpad.net/ubuntu-phone/msg09842.html

  [1] - http://bazaar.launchpad.net/~verzegnassi-stefano/+junk/recorder-test/files
  [2]
  {
      "policy_version": 1.2,
      "template": "unconfined",
      "policy_groups": []
  }

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