eBPF-based device cgroup controller

This patchset introduces an eBPF-based device controller for cgroup v2.

Patches (1) and (2) are a preparational work required to share some code
with the existing device controller implementation.
Patch (3) is the main patch, which introduces a new bpf prog type
and all necessary infrastructure.
Patch (4) moves cgroup_helpers.c/h to use them by patch (4). Patch (5) implements an example of eBPF program which controls access
to device files and corresponding userspace test.

v3:
Renamed constants introduced by patch (3) to BPF_DEVCG_*

v2:
Added patch (1).

v1:
https://lkml.org/lkml/2017/11/1/363

Roman Gushchin (5):
device_cgroup: add DEVCG_ prefix to ACC_* and DEV_* constants
device_cgroup: prepare code for bpf-based device controller bpf, cgroup: implement eBPF-based device controller for cgroup v2
bpf: move cgroup_helpers from samples/bpf/ to
tools/testing/selftesting/bpf/
selftests/bpf: add a test for device cgroup controller

 include/linux/bpf-cgroup.h                         | 15 ++++
 include/linux/bpf_types.h                          |  3 +
 include/linux/device_cgroup.h                      | 67 +++++++++++++++-
 include/uapi/linux/bpf.h                           | 15 ++++
 kernel/bpf/cgroup.c                                | 67 ++++++++++++++++
 kernel/bpf/syscall.c                               |  7 ++
 kernel/bpf/verifier.c                              |  1 +
 samples/bpf/Makefile                               |  5 +-
 security/device_cgroup.c                           | 91 ++++++---------------
 tools/include/uapi/linux/bpf.h                     | 15 ++++
 tools/testing/selftests/bpf/Makefile               |  6 +-
 .../testing/selftests}/bpf/cgroup_helpers.c        |  0
 .../testing/selftests}/bpf/cgroup_helpers.h        |  0
 tools/testing/selftests/bpf/dev_cgroup.c           | 60 ++++++++++++++
 tools/testing/selftests/bpf/test_dev_cgroup.c      | 93 ++++++++++++++++++++++
 15 files changed, 369 insertions(+), 76 deletions(-)
 rename {samples => tools/testing/selftests}/bpf/cgroup_helpers.c (100%)
 rename {samples => tools/testing/selftests}/bpf/cgroup_helpers.h (100%)
 create mode 100644 tools/testing/selftests/bpf/dev_cgroup.c
 create mode 100644 tools/testing/selftests/bpf/test_dev_cgroup.c

2.13.6