[PATCH v5 0/7] Add seccomp notifier ioctl that enables adding fds

From: Kees Cook
Date: Wed Jun 17 2020 - 18:04:11 EST


Hello!

v5:
- merge ioctl fixes into Sargun's patches directly
- adjust new API to avoid "ufd_required" argument
- drop general clean up patches now present in for-next/seccomp
v4: https://lore.kernel.org/lkml/20200616032524.460144-1-keescook@xxxxxxxxxxxx/

This continues the thread-merge between [1] and [2]. tl;dr: add a way for
a seccomp user_notif process manager to inject files into the managed
process in order to handle emulation of various fd-returning syscalls
across security boundaries. Containers folks and Chrome are in need
of the feature, and investigating this solution uncovered (and fixed)
implementation issues with existing file sending routines.

I intend to carry this in the seccomp tree, unless someone has objections.
:) Please review and test!

-Kees

[1] https://lore.kernel.org/lkml/20200603011044.7972-1-sargun@xxxxxxxxx/
[2] https://lore.kernel.org/lkml/20200610045214.1175600-1-keescook@xxxxxxxxxxxx/


Kees Cook (5):
net/scm: Regularize compat handling of scm_detach_fds()
fs: Move __scm_install_fd() to __fd_install_received()
fs: Add fd_install_received() wrapper for __fd_install_received()
pidfd: Replace open-coded partial fd_install_received()
fs: Expand __fd_install_received() to accept fd

Sargun Dhillon (2):
seccomp: Introduce addfd ioctl to seccomp user notifier
selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD

fs/file.c | 63 +++++
include/linux/file.h | 19 ++
include/uapi/linux/seccomp.h | 22 ++
kernel/pid.c | 11 +-
kernel/seccomp.c | 172 ++++++++++++-
net/compat.c | 55 ++---
net/core/scm.c | 50 +---
tools/testing/selftests/seccomp/seccomp_bpf.c | 229 ++++++++++++++++++
8 files changed, 540 insertions(+), 81 deletions(-)

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2.25.1