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------- Comment From strosake@xxxxxxxxxx 2015-08-18 21:27 EDT-------
The patches for seccomp mode 2 support are queued for 4.3; as they were developed against 4.2, I would expect them to apply cleanly to the Ubuntu 15.10 kernel.  I am willing to help with backporting if they don't, or if other modifications to the Ubuntu kernel cause issues with applying them.

There were 11 patches in the patchset:

[PATCH 01/11] powerpc/kernel: Switch to using MAX_ERRNO
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131601.html

[PATCH 02/11] powerpc/kernel: Change the do_syscall_trace_enter() API
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131602.html

[PATCH 03/11] powerpc: Drop unused syscall_get_error()
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131603.html

[PATCH 04/11] powerpc: Don't negate error in syscall_set_return_value()
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131604.html

[PATCH 05/11] powerpc: Rework syscall_get_arguments() so there is only one loop
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131605.html

[PATCH 06/11] powerpc: Use orig_gpr3 in syscall_get_arguments()
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131606.html

[PATCH 07/11] powerpc: Change syscall_get_nr() to return int
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131607.html

[PATCH 08/11] powerpc/kernel: Add SIG_SYS support for compat tasks
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131608.html

[PATCH 09/11] powerpc/kernel: Enable seccomp filter
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131609.html

[PATCH 10/11] selftests/seccomp: Make seccomp tests work on big endian
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131610.html

[PATCH 11/11] selftests/seccomp: Add powerpc support
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-July/131611.html

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https://bugs.launchpad.net/bugs/1458876

Title:
  [Ubuntu 15.10] Add seccomp mode 2 to the Ubuntu Power LE kernel

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  seccomp mode 2 involves the parsing of BPF (Berkeley Packet Filter)
  configuration files to define system call filtering.  Mode 2 is not
  currently supported on Power; this feature covers the addition of this
  support, which likely includes updates to the kernel and to
  libseccomp.

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