[GIT PULL] seccomp updates for v5.9-rc1

[Kees Cook]

Hi Linus,

Please pull these seccomp updates for v5.9-rc1. There are a bunch of
clean ups and selftest improvements along with two major updates to the
SECCOMP_RET_USER_NOTIF filter return: EPOLLHUP support to more easily
detect the death of a monitored process, and being able to inject fds when
intercepting syscalls that expect an fd-opening side-effect (needed by
both container folks and Chrome). The latter continued the refactoring
of __scm_install_fd() started by Christoph, and in the process found
and fixed a handful of bugs in various callers.

Thanks!

-Kees

The following changes since commit b3a9e3b9622ae10064826dccb4f7a52bd88c7407:

  Linux 5.8-rc1 (2020-06-14 12:45:04 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/seccomp-v5.9-rc1

for you to fetch changes up to c97aedc52dce4c87d4c44de4e6af941cd102600c:

  selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD (2020-07-14 16:30:22 -0700)

----------------------------------------------------------------
seccomp updates for v5.9-rc1

- Improved selftest coverage, timeouts, and reporting
- Add EPOLLHUP support for SECCOMP_RET_USER_NOTIF (Christian Brauner)
- Refactor __scm_install_fd() into __receive_fd() and fix buggy callers
- Introduce "addfd" command for SECCOMP_RET_USER_NOTIF (Sargun Dhillon)

----------------------------------------------------------------
Christian Brauner (5):
      seccomp: rename "usage" to "refs" and document
      seccomp: release filter after task is fully dead
      seccomp: Lift wait_queue into struct seccomp_filter
      seccomp: notify about unused filter
      selftests/seccomp: Check for EPOLLHUP for user_notif

Kees Cook (21):
      selftests/seccomp: Rename XFAIL to SKIP
      selftests/seccomp: Add SKIPs for failed unshare()
      selftests/seccomp: Set NNP for TSYNC ESRCH flag test
      seccomp: Report number of loaded filters in /proc/$pid/status
      selftests/seccomp: Expand benchmark to per-filter measurements
      selftests/seccomp: Improve calibration loop
      seccomp: Use pr_fmt
      selftests/seccomp: Make kcmp() less required
      selftests/seccomp: Rename user_trap_syscall() to user_notif_syscall()
      seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID
      seccomp: Use -1 marker for end of mode 1 syscall list
      selftests/harness: Clean up kern-doc for fixtures
      selftests/seccomp: Refactor to use fixture variants
      selftests/seccomp: Check ENOSYS under tracing
      net/compat: Add missing sock updates for SCM_RIGHTS
      pidfd: Add missing sock updates for pidfd_getfd()
      net/scm: Regularize compat handling of scm_detach_fds()
      fs: Move __scm_install_fd() to __receive_fd()
      fs: Add receive_fd() wrapper for __receive_fd()
      pidfd: Replace open-coded receive_fd()
      fs: Expand __receive_fd() to accept existing fd

Sargun Dhillon (3):
      seccomp: Add find_notification helper
      seccomp: Introduce addfd ioctl to seccomp user notifier
      selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD

Thadeu Lima de Souza Cascardo (1):
      selftests/seccomp: use 90s as timeout

 arch/mips/include/asm/seccomp.h                    |   4 +-
 fs/file.c                                          |  61 ++
 fs/proc/array.c                                    |   2 +
 include/asm-generic/seccomp.h                      |   2 +-
 include/linux/file.h                               |  19 +
 include/linux/seccomp.h                            |  10 +-
 include/net/sock.h                                 |   4 +
 include/uapi/linux/seccomp.h                       |  25 +-
 init/init_task.c                                   |   3 +
 kernel/exit.c                                      |   1 +
 kernel/fork.c                                      |   1 -
 kernel/pid.c                                       |  14 +-
 kernel/seccomp.c                                   | 376 ++++++++---
 net/compat.c                                       |  55 +-
 net/core/scm.c                                     |  50 +-
 net/core/sock.c                                    |  21 +
 tools/testing/selftests/kselftest_harness.h        |  15 +-
 tools/testing/selftests/seccomp/config             |   1 +
 .../testing/selftests/seccomp/seccomp_benchmark.c  |  80 ++-
 tools/testing/selftests/seccomp/seccomp_bpf.c      | 708 +++++++++++++++------
 tools/testing/selftests/seccomp/settings           |   1 +
 21 files changed, 1061 insertions(+), 392 deletions(-)
 create mode 100644 tools/testing/selftests/seccomp/settings

-- 
Kees Cook