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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Forgot to attach the simplified file..

** Attachment added: "simpler standalone reproducer C file"
   https://bugs.launchpad.net/ubuntu/+source/libseccomp/+bug/1526358/+attachment/4535518/+files/seccomp-socket-filter.c

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https://bugs.launchpad.net/bugs/1526358

Title:
  adding seccomp rule for socket() fails on i386 since kernel 4.3

Status in libseccomp package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  Four days ago, on Dec 10,
  http://autopkgtest.ubuntu.com/packages/s/systemd/xenial/i386/ started
  failing:

  ======================================================================
  FAIL: test_boot (__main__.NspawnTest)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/adt-run.IG1dKn/build.Yzd/systemd-228/debian/tests/boot-and-services", line 204, in test_boot
      self.assertIn(b'fake container started', out)
  AssertionError: b'fake container started' not found in b'Spawning container c1 on /tmp/tmpl04y_tf8/c1.\nPress ^] three times within 1s to kill container.\nFailed to create directory /tmp/tmpl04y_tf8/c1/sys/fs/selinux: Read-only file system\nFailed to create directory /tmp/tmpl04y_tf8/c1/sys/fs/selinux: Read-only file system\nFailed to add audit seccomp rule: Bad address\n'

  This is reproducible in xenial-release, i. e. it already slipped
  through -proposed.

  This can be reproduced easily on a xenial i386 VM:

    sudo apt-get install busybox-static
    mkdir -p /tmp/c/sbin /tmp/c/etc /tmp/c/bin/
    cp /bin/busybox /tmp/c/bin/
    ln -s ../bin/busybox /tmp/c/sbin/init
    ln -s busybox /tmp/c/bin/sh
    cp /etc/os-release /tmp/c/etc
    sudo systemd-nspawn -b -D /tmp/c

  This should normally boot a busybox container; you'll get a few error
  messages as there's no SysV init stuff there, but it should start and
  pressing enter should get you into a shell. But on i386 it fails with

  $   sudo systemd-nspawn -b -D /tmp/c
  Spawning container c on /tmp/c.
  Press ^] three times within 1s to kill container.
  Failed to create directory /tmp/c/sys/fs/selinux: Read-only file system
  Failed to create directory /tmp/c/sys/fs/selinux: Read-only file system
  Failed to add audit seccomp rule: Bad address

  which is what the test case fails on too.

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