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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1638996

Title:
  apparmor's raw_data file in securityfs is sometimes truncated

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Committed

Bug description:
  Hi,

  It looks like sometimes apparmor's securityfs output is sometimes
  truncated,

  root@zesty:/sys/kernel/security/apparmor/policy/namespaces/lxd-zest_<var-lib-lxd>/profiles/usr.lib.snapd.snap-confine.1# ls -al
  total 0
  drwxr-xr-x  3 root root     0 Nov  3 16:45 .
  drwxr-xr-x 13 root root     0 Nov  3 16:44 ..
  -r--r--r--  1 root root     0 Nov  3 16:45 attach
  -r--r--r--  1 root root     0 Nov  3 16:45 mode
  -r--r--r--  1 root root     0 Nov  3 16:45 name
  drwxr-xr-x  3 root root     0 Nov  3 16:45 profiles
  -r--r--r--  1 root root     0 Nov  3 16:45 raw_abi
  -r--r--r--  1 root root 46234 Nov  3 16:45 raw_data
  -r--r--r--  1 root root     0 Nov  3 16:45 raw_hash
  -r--r--r--  1 root root     0 Nov  3 16:45 sha1
  root@zesty:/sys/kernel/security/apparmor/policy/namespaces/lxd-zest_<var-lib-lxd>/profiles/usr.lib.snapd.snap-confine.1# cat raw_data > /tmp/out
  root@zesty:/sys/kernel/security/apparmor/policy/namespaces/lxd-zest_<var-lib-lxd>/profiles/usr.lib.snapd.snap-confine.1# ls -al /tmp/out 
  -rw-r--r-- 1 root root 4009 Nov  3 16:55 /tmp/out

  and

  2016-11-03 10:58:01 tych0 jjohansen: hi, http://paste.ubuntu.com/23421551/
  2016-11-03 10:58:18 tych0 it looks like fstat is lying to me about the size of the policy
  2016-11-03 10:59:20 @jjohansen  tych0: hrmm interesting, can you zip up the /tmp/out file so I can see it looks like a complete policy file?
  2016-11-03 11:00:03 @jjohansen  something is definitely not right there. hrmmm
  2016-11-03 11:00:26 @jjohansen  the size is set by the input buffer size
  2016-11-03 11:00:28 tych0 jjohansen: http://files.tycho.ws/tmp/out
  2016-11-03 11:00:36 tych0 yeah, i assume
  2016-11-03 11:01:15 @jjohansen  my guess is something is messing up in the seq_file walk of the policy
  2016-11-03 11:02:38 @jjohansen  tych0: yep the file is truncated, can you open a bug and I will start looking for it
  2016-11-03 11:03:14 tych0 jjohansen: sure, just on linux?
  2016-11-03 11:03:35 @jjohansen  tych0: yeah for now, just linux
  2016-11-03 11:03:43 @jjohansen  we can add others if needed later
  2016-11-03 11:03:44 tych0 jjohansen: FWIW, somehow it seems racy, becasue sometimes it works and sometimes it doesn't

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