[GIT PULL] seccomp fixes for v5.5-rc5

[Kees Cook]

Hi Linus,

Please pull these seccomp fixes for v5.5-rc5. The bulk of this is fixing
the surrounding samples and selftests so that seccomp can correctly
validate the seccomp_notify_ioctl buffer as being initially zeroed.

Thanks!

-Kees

The following changes since commit fd6988496e79a6a4bdb514a4655d2920209eb85d:

  Linux 5.5-rc4 (2019-12-29 15:29:16 -0800)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/seccomp-v5.5-rc5

for you to fetch changes up to e4ab5ccc357b978999328fadae164e098c26fa40:

  selftests/seccomp: Catch garbage on SECCOMP_IOCTL_NOTIF_RECV (2020-01-02 13:15:45 -0800)

----------------------------------------------------------------
Fixes for seccomp_notify_ioctl uapi sanity

- Fix samples and selftests to zero passed-in buffer (Sargun Dhillon)
- Enforce zeroed buffer checking (Sargun Dhillon)
- Verify buffer sanity check in selftest (Sargun Dhillon)

----------------------------------------------------------------
Sargun Dhillon (4):
      samples/seccomp: Zero out members based on seccomp_notif_sizes
      selftests/seccomp: Zero out seccomp_notif
      seccomp: Check that seccomp_notif is zeroed out by the user
      selftests/seccomp: Catch garbage on SECCOMP_IOCTL_NOTIF_RECV

 kernel/seccomp.c                              |  7 +++++++
 samples/seccomp/user-trap.c                   |  4 ++--
 tools/testing/selftests/seccomp/seccomp_bpf.c | 15 ++++++++++++++-
 3 files changed, 23 insertions(+), 3 deletions(-)

-- 
Kees Cook