netdev - [PATCH bpf-next 0/4] sys_bpf() access control via /dev/bpf

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Date:   Tue, 25 Jun 2019 11:22:59 -0700
From:   Song Liu <songliubraving@...com>
To:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <kernel-team@...com>,
        Song Liu <songliubraving@...com>
Subject: [PATCH bpf-next 0/4] sys_bpf() access control via /dev/bpf

Currently, most access to sys_bpf() is limited to root. However, there are
use cases that would benefit from non-privileged use of sys_bpf(), e.g.
systemd.

This set introduces a new model to control the access to sys_bpf(). A
special device, /dev/bpf, is introduced to manage access to sys_bpf().
Users with access to open /dev/bpf will be able to access most of
sys_bpf() features. The use can get access to sys_bpf() by opening /dev/bpf
and use ioctl to get/put permission.

The permission to access sys_bpf() is marked by bit TASK_BPF_FLAG_PERMITTED
in task_struct. During fork(), child will not inherit this bit.

libbpf APIs libbpf_[get|put]_bpf_permission() are added to help get and
put the permission. bpftool is updated to use these APIs.

Song Liu (4):
  bpf: unprivileged BPF access via /dev/bpf
  bpf: sync tools/include/uapi/linux/bpf.h
  libbpf: add libbpf_[get|put]_bpf_permission()
  bpftool: use libbpf_[get|put]_bpf_permission()

 Documentation/ioctl/ioctl-number.txt |  1 +
 include/linux/bpf.h                  | 12 +++++
 include/linux/sched.h                |  8 ++++
 include/uapi/linux/bpf.h             |  5 ++
 kernel/bpf/arraymap.c                |  2 +-
 kernel/bpf/cgroup.c                  |  2 +-
 kernel/bpf/core.c                    |  4 +-
 kernel/bpf/cpumap.c                  |  2 +-
 kernel/bpf/devmap.c                  |  2 +-
 kernel/bpf/hashtab.c                 |  4 +-
 kernel/bpf/lpm_trie.c                |  2 +-
 kernel/bpf/offload.c                 |  2 +-
 kernel/bpf/queue_stack_maps.c        |  2 +-
 kernel/bpf/reuseport_array.c         |  2 +-
 kernel/bpf/stackmap.c                |  2 +-
 kernel/bpf/syscall.c                 | 72 +++++++++++++++++++++-------
 kernel/bpf/verifier.c                |  2 +-
 kernel/bpf/xskmap.c                  |  2 +-
 kernel/fork.c                        |  4 ++
 net/core/filter.c                    |  6 +--
 tools/bpf/bpftool/feature.c          |  2 +-
 tools/bpf/bpftool/main.c             |  5 ++
 tools/include/uapi/linux/bpf.h       |  5 ++
 tools/lib/bpf/libbpf.c               | 54 +++++++++++++++++++++
 tools/lib/bpf/libbpf.h               |  7 +++
 tools/lib/bpf/libbpf.map             |  2 +
 26 files changed, 178 insertions(+), 35 deletions(-)

--
2.17.1