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Subject[PATCH v2 0/4] seccomp trap to userspace

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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