[PATCH v7 0/6] seccomp trap to userspace

[Tycho Andersen]

Hi all,

Here's v7 of the seccomp trap to userspace set. There are various minor
changes and bug fixes, but two major changes:

* We now pass fds to the tracee via an ioctl, and do it immediately when
  the ioctl is called. For this we needed some help from the vfs, so
  I've put the one patch in this series and cc'd fsdevel. This does have
  the advantage that the feature is now totally decoupled from the rest
  of the set, which is itself useful (thanks Andy!)

* Instead of putting all of the notification related stuff into the
  struct seccomp_filter, it now lives in its own struct notification,
  which is pointed to by struct seccomp_filter. This will save a lot of
  memory (thanks Tyler!)

v6 discussion: https://lkml.org/lkml/2018/9/6/769

Thoughts welcome,

Tycho

Tycho Andersen (6):
  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
  files: add a replace_fd_files() function
  seccomp: add a way to pass FDs via a notification fd
  samples: add an example of seccomp user trap

 Documentation/ioctl/ioctl-number.txt          |   1 +
 .../userspace-api/seccomp_filter.rst          |  89 +++
 fs/file.c                                     |  22 +-
 include/linux/file.h                          |   8 +
 include/linux/seccomp.h                       |  14 +-
 include/uapi/linux/ptrace.h                   |   2 +
 include/uapi/linux/seccomp.h                  |  42 +-
 kernel/ptrace.c                               |   4 +
 kernel/seccomp.c                              | 527 ++++++++++++++-
 samples/seccomp/.gitignore                    |   1 +
 samples/seccomp/Makefile                      |   7 +-
 samples/seccomp/user-trap.c                   | 312 +++++++++
 tools/testing/selftests/seccomp/seccomp_bpf.c | 607 +++++++++++++++++-
 13 files changed, 1617 insertions(+), 19 deletions(-)
 create mode 100644 samples/seccomp/user-trap.c

-- 
2.17.1