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* [PATCH v2 bpf-next 0/4] sys_bpf() access control via /dev/bpf
@ 2019-06-27 20:19 Song Liu
  2019-06-27 20:19 ` [PATCH v2 bpf-next 1/4] bpf: unprivileged BPF access " Song Liu
                   ` (3 more replies)
  0 siblings, 4 replies; 92+ messages in thread
From: Song Liu @ 2019-06-27 20:19 UTC (permalink / raw)
  To: netdev, bpf; +Cc: ast, daniel, kernel-team, lmb, jannh, gregkh, Song Liu

Changes v1 => v2:
1. Make default mode of /dev/bpf 0220 (Greg);
2. Rename ioctl commands as BPF_DEV_IOCTL_ENABLE_SYS_BPF and
   BPF_DEV_IOCTL_DISABLE_SYS_BPF (Daniel);
3. Save space for task_struct by reusing free bit (Daniel);
4. Make the permission per process (Lorenz).

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 enable/disable the access.

The permission to access sys_bpf() is marked by bit bpf_permitted in
task_struct. During clone(), child will inherit this bit if CLONE_THREAD
is set. Therefore, the permission is shared within same user process,
but not via fork().

libbpf APIs libbpf_[enable|disable]_sys_bpf() 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_[enable|disable]_sys_bpf()
  bpftool: use libbpf_[enable|disable]_sys_bpf()

 Documentation/ioctl/ioctl-number.txt |  1 +
 include/linux/bpf.h                  | 11 +++++
 include/linux/sched.h                |  3 ++
 include/uapi/linux/bpf.h             |  6 +++
 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                 | 71 +++++++++++++++++++++-------
 kernel/bpf/verifier.c                |  2 +-
 kernel/bpf/xskmap.c                  |  2 +-
 kernel/fork.c                        |  5 ++
 net/core/filter.c                    |  6 +--
 tools/bpf/bpftool/feature.c          |  2 +-
 tools/bpf/bpftool/main.c             |  5 ++
 tools/include/uapi/linux/bpf.h       |  6 +++
 tools/lib/bpf/libbpf.c               | 54 +++++++++++++++++++++
 tools/lib/bpf/libbpf.h               |  7 +++
 tools/lib/bpf/libbpf.map             |  2 +
 26 files changed, 174 insertions(+), 35 deletions(-)

--
2.17.1

^ permalink raw reply	[flat|nested] 92+ messages in thread

end of thread, other threads:[~2019-08-27  0:34 UTC | newest]

Thread overview: 92+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-27 20:19 [PATCH v2 bpf-next 0/4] sys_bpf() access control via /dev/bpf Song Liu
2019-06-27 20:19 ` [PATCH v2 bpf-next 1/4] bpf: unprivileged BPF access " Song Liu
2019-06-27 23:40   ` Andy Lutomirski
2019-06-27 23:42     ` Andy Lutomirski
2019-06-28 10:28       ` Christian Brauner
2019-06-28  9:05     ` Lorenz Bauer
2019-06-28 19:04     ` Song Liu
2019-06-30  0:12       ` Andy Lutomirski
2019-07-01  9:03         ` Song Liu
2019-07-02  1:59           ` Andy Lutomirski
2019-07-02 18:24             ` Kees Cook
2019-07-02 21:32               ` Andy Lutomirski
2019-07-02 23:48                 ` Song Liu
2019-07-22 20:53                 ` Song Liu
2019-07-23 10:45                   ` Lorenz Bauer
2019-07-23 15:11                   ` Andy Lutomirski
2019-07-23 22:56                     ` Song Liu
2019-07-24  1:40                       ` Andy Lutomirski
2019-07-24  6:30                         ` Song Liu
2019-07-27 18:20                           ` Song Liu
2019-07-30  5:07                             ` Song Liu
2019-07-30 20:24                               ` Andy Lutomirski
2019-07-31  8:10                                 ` Song Liu
2019-07-31 19:09                                   ` Andy Lutomirski
2019-08-02  7:21                                     ` Song Liu
2019-08-04 22:16                                       ` Andy Lutomirski
2019-08-05  0:08                                         ` Andy Lutomirski
2019-08-05  5:47                                           ` Andy Lutomirski
2019-08-05  7:36                                             ` Song Liu
2019-08-05 17:23                                               ` Andy Lutomirski
2019-08-05 19:21                                                 ` Alexei Starovoitov
2019-08-05 21:25                                                   ` Andy Lutomirski
2019-08-05 22:21                                                     ` Andy Lutomirski
2019-08-06  1:11                                                     ` Alexei Starovoitov
2019-08-07  5:24                                                       ` Andy Lutomirski
2019-08-07  9:03                                                         ` Lorenz Bauer
2019-08-07 13:52                                                           ` Andy Lutomirski
2019-08-13 21:58                                                         ` Alexei Starovoitov
2019-08-13 22:26                                                           ` Daniel Colascione
2019-08-13 23:24                                                             ` Andy Lutomirski
2019-08-13 23:06                                                           ` Andy Lutomirski
2019-08-14  0:57                                                             ` Alexei Starovoitov
2019-08-14 17:51                                                               ` Andy Lutomirski
2019-08-14 22:05                                                                 ` Alexei Starovoitov
2019-08-14 22:30                                                                   ` Andy Lutomirski
2019-08-14 23:33                                                                     ` Alexei Starovoitov
2019-08-14 23:59                                                                       ` Andy Lutomirski
2019-08-15  0:36                                                                         ` Alexei Starovoitov
2019-08-15 11:24                                                                   ` Jordan Glover
2019-08-15 17:28                                                                     ` Alexei Starovoitov
2019-08-15 18:36                                                                       ` Andy Lutomirski
2019-08-15 23:08                                                                         ` Alexei Starovoitov
2019-08-16  9:34                                                                           ` Jordan Glover
2019-08-16  9:59                                                                             ` Thomas Gleixner
2019-08-16 11:33                                                                               ` Jordan Glover
2019-08-16 19:52                                                                                 ` Alexei Starovoitov
2019-08-16 20:28                                                                                   ` Thomas Gleixner
2019-08-17 15:02                                                                                     ` Alexei Starovoitov
2019-08-17 15:44                                                                                       ` Andy Lutomirski
2019-08-19  9:15                                                                                       ` Thomas Gleixner
2019-08-19 17:27                                                                                         ` Alexei Starovoitov
2019-08-19 17:38                                                                                           ` Andy Lutomirski
2019-08-15 18:43                                                                       ` Jordan Glover
2019-08-15 19:46                                                           ` Kees Cook
2019-08-15 23:46                                                             ` Alexei Starovoitov
2019-08-16  0:54                                                               ` Andy Lutomirski
2019-08-16  5:56                                                                 ` Song Liu
2019-08-16 21:45                                                                 ` Alexei Starovoitov
2019-08-16 22:22                                                                   ` Christian Brauner
2019-08-17 15:08                                                                     ` Alexei Starovoitov
2019-08-17 15:16                                                                       ` Christian Brauner
2019-08-17 15:36                                                                         ` Alexei Starovoitov
2019-08-17 15:42                                                                           ` Christian Brauner
2019-08-22 14:17                                                         ` Daniel Borkmann
2019-08-22 15:16                                                           ` Andy Lutomirski
2019-08-22 15:17                                                             ` RFC: very rough draft of a bpf permission model Andy Lutomirski
2019-08-22 23:26                                                               ` Alexei Starovoitov
2019-08-23 23:09                                                                 ` Andy Lutomirski
2019-08-26 22:36                                                                   ` Alexei Starovoitov
2019-08-27  0:05                                                                     ` Andy Lutomirski
2019-08-27  0:34                                                                       ` Alexei Starovoitov
2019-08-22 22:48                                                           ` [PATCH v2 bpf-next 1/4] bpf: unprivileged BPF access via /dev/bpf Alexei Starovoitov
2019-07-30 20:20                             ` Andy Lutomirski
2019-07-31  7:44                               ` Song Liu
2019-06-28  9:01   ` Lorenz Bauer
2019-06-28 19:10     ` Song Liu
2019-07-01  9:34       ` Lorenz Bauer
2019-07-02 19:22   ` Andrii Nakryiko
2019-07-03  7:28     ` Greg KH
2019-06-27 20:19 ` [PATCH v2 bpf-next 2/4] bpf: sync tools/include/uapi/linux/bpf.h Song Liu
2019-06-27 20:19 ` [PATCH v2 bpf-next 3/4] libbpf: add libbpf_[enable|disable]_sys_bpf() Song Liu
2019-06-27 20:19 ` [PATCH v2 bpf-next 4/4] bpftool: use libbpf_[enable|disable]_sys_bpf() Song Liu

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