[PATCH v2 0/4] seccomp trap to userspace

Tycho Andersen tycho at tycho.ws
Thu May 17 15:12:14 UTC 2018


After a while focusing on other things, I finally managed ot get a v2 of
this series prepared. I believe I've addressed all the feedback from v1,
except for one major point: switching the communication protocol over
the fd to nlattr. I looked into doing this, but the kernel stuff for
dealing with nlattr seems to require an skb (via nlmsg_{new,put} and
netlink_unicast), which means we need to deal with the netlink sequence
numbers, portids, and create a socket protocol. I can do this if we
still think nlattr is necessary, but based on looking at it, it seems
like a lot of extra code for no real benefit.

I've also added support for passing fds. The code itself is simple, but
the API could/should probably be different, see patch 4 for discussion.


Tycho Andersen (4):
  seccomp: add a return code to trap to userspace
  seccomp: make get_nth_filter available outside of CHECKPOINT_RESTORE
  seccomp: add a way to get a listener fd from ptrace
  seccomp: add support for passing fds via USER_NOTIF

 arch/Kconfig                                  |   7 +
 include/linux/seccomp.h                       |  14 +-
 include/uapi/linux/ptrace.h                   |   2 +
 include/uapi/linux/seccomp.h                  |  20 +-
 kernel/ptrace.c                               |   4 +
 kernel/seccomp.c                              | 480 +++++++++++++++++-
 tools/testing/selftests/seccomp/seccomp_bpf.c | 359 ++++++++++++-
 7 files changed, 878 insertions(+), 8 deletions(-)


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