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[John Johansen <john.johansen@xxxxxxxxxxxxx>]

I can confirm this issue also affects the manta kernel

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https://bugs.launchpad.net/bugs/1295948

Title:
  mako kernel doesn't support xattrs in the security namespace

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Attempting on a mako device to setfattr on a file with the security
  namespace fails with EOPNOTSUPP:

    $ sudo setfattr  -h -n security.sdtest -v hello testfile
    setfattr: testfile: Operation not supported

  but the 'trusted' and 'user' namespaces work properly:

    $ sudo setfattr  -h -n user.sdtest -v hello testfile
    $ sudo getfattr  -h -n user.sdtest  testfile
    # file: testfile
    user.sdtest="hello"

  strace'ing the setfaddr command shows the following:

    lsetxattr("testfile", "security.sdtest", "hello", 5, 0) = -1
  EOPNOTSUPP (Operation not supported)

  This is not the case for other kernels based off an android kernel.
  e.g. it works fine on a grouper device.

  $ uname -a
  Linux ubuntu-phablet 3.4.0-5-mako #26-Ubuntu SMP PREEMPT Tue Feb 25 19:23:05 UTC 2014 armv7l armv7l armv7l GNU/Linux

  Steps to reproduce:

    $ dd if=/dev/zero of=test.img bs=4096 count=4096
    4096+0 records in
    4096+0 records out
    16777216 bytes (17 MB) copied, 0.181383 s, 92.5 MB/s
    $ mkfs.ext3 -q -F test.img
    $ mkdir mountpoint
    $ sudo mount -o loop,user_xattr test.img mountpoint
    [sudo] password for phablet:
    $ mount | grep mountpoint
    /home/phablet/test.img on /home/phablet/mountpoint type ext3 (rw,relatime,errors=continue,user_xattr,barrier=1,data=writeback)
    $ cd mountpoint/
    $ sudo touch testfile
    $ sudo setfattr  -h -n security.sdtest -v hello testfile   # this command fails on mako, not on grouper
    setfattr: testfile: Operation not supported
    $ sudo setfattr  -h -n trusted.sdtest -v hello testfile
    $ sudo getfattr  -h -n trusted.sdtest  testfile
    # file: testfile
    trusted.sdtest="hello"

  It fails regardless of whether the filesystem is ext3 or ext4.

  (There are apparmor tests that exercise this functionality, which is
  how it was noticed.)

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