kernel-packages team mailing list archive

[Jamie Strandboge <jamie@xxxxxxxxxx>]

Here is a reproducer. See main.c for instructions.

** Attachment added: "1562989.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1562989/+attachment/4615205/+files/1562989.tar.gz

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https://bugs.launchpad.net/bugs/1562989

Title:
  'aa_change_onexec failed with -1. errmsg: Permission denied'

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  $ sudo apt-get install ubuntu-snappy
  $ sudo snappy install ubuntu-core
  $ sudo snappy install ubuntu-clock-app.ubuntucore-dev
  $ ubuntu-clock-app.clock
  aa_change_onexec failed with -1. errmsg: Permission denied
  [1]

  There is an apparmor denial:
  audit: type=1400 audit(1459194964.529:35): apparmor="DENIED" operation="change_onexec" profile="/usr/bin/ubuntu-core-launcher" name="ubuntu-clock-app.ubuntucoredev_clock_3.6+snap2" pid=2080 comm="ubuntu-core-lau" target="ubuntu-clock-app.ubuntucoredev_clock_3.6+snap2"

  Downgrading to ubuntu-core-launcher doesn't help the clock app get
  past this failure.

  The hello-world app works ok (it needs ubuntu-core-launcher 1.0.20 since it gets past the above error and the launcher needs to account for NO_NEW_PRIVS):
  $ hello-world.env |grep SNAP=
  SNAP=/snaps/hello-world.canonical/6.0

  $ sudo /snaps/bin/hello-world.env |grep SNAP=
  SNAP=/snaps/hello-world.canonical/6.0

  cap-test.mvo doesn't have this problem either:
  $ sudo snappy install cap-test.mvo
  $ cap-test.xbomb

  If I disable the apparmor profile with: sudo apparmor_parser -R
  /etc/apparmor.d/usr.bin.ubuntu-core-launcher then the app will launch.

  Downgrading to the -13 kernel resolves the issue:
  $ cat /proc/version_signature
  Ubuntu 4.4.0-13.29-generic 4.4.5

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