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[Launchpad Bug Tracker <1682102@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package libseccomp - 2.3.1-2.1ubuntu2~16.04.1

---------------
libseccomp (2.3.1-2.1ubuntu2~16.04.1) xenial; urgency=medium

  * Backport libseccomp 2.3.1 to xenial LP: #1682102
    - Improved s390x support
    - Improved support for v4.5+ kernels

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Fri, 06 Oct 2017 14:47:39
+0100

** Changed in: libseccomp (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1682102

Title:
  libseccomp should support GA and HWE kernels

Status in libseccomp package in Ubuntu:
  Invalid
Status in libseccomp source package in Xenial:
  Fix Released

Bug description:
  [Impact]

  out of date libseccomp w.r.t. custom and hwe kernels provides sub-par userspace protection, which is otherwise available on the running kernel and hardware combination.
  This results in subpar security of systems running new architectures (s390x & ppc64el) and newer hwe/custom kernels.

  * Version 2.3.1 - April 20, 2016
  - Fixed a problem with 32-bit x86 socket syscalls on some systems
  - Fixed problems with ipc syscalls on 32-bit x86
  - Fixed problems with socket and ipc syscalls on s390 and s390x

  * Version 2.3.0 - February 29, 2016
  - Added support for the s390 and s390x architectures
  - Added support for the ppc, ppc64, and ppc64le architectures
  - Update the internal syscall tables to match the Linux 4.5-rcX releases
  - Filter generation for both multiplexed and direct socket syscalls on x86
  - Support for the musl libc implementation
  - Additions to the API to enable runtime version checking of the library
  - Enable the use of seccomp() instead of prctl() on supported systems
  - Added additional tests to the regression test suite

  There is no ABI/API break

  There are no packaging changes, apart from dropping patches included
  in this upstream release and updating new symbols.

  Doing wholesome update is safer and carries less risk, than
  individually cherrypicking effectively all of the above.

  This is a backport to an LTS release under the banner of safe
  introduction of new features and new hardware support.

  It is expected that container technologies will take advantage of the
  newly available libseccomp.

  This may need to be uploaded as a security update.

  Currently, s390x support in xenial libssecomp is incomplete. And there
  are v4.5+ syscall tables missing as used by hwe kernels and some
  custom kernels.

  [Testcase]
  Validate that all main contianer technologies are operational and do not regress, e.g.:
   - lxc
   - lxd
   - docker
   - snapd

  [Regression Potential]
  Userspace components may detect at runtime newly available libseccomp, and thus restrict user-space processes more than previously done. This may lead to a change of restrictions applied on the user sapce processes, and result in previously unexpected denials / errors returned.

  
  [Proposed Update available in bileto PPA]
  https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/2981

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