[PATCH v7 0/6] seccomp trap to userspace

Tycho Andersen
2018-09-27T15:11:39Z

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