LSM hooks for IORING_OP_URING_CMD

This patchset includes three patches: one to add a new LSM hook for
the IORING_OP_URING_CMD operation, one to add the SELinux
implementation for the new hook, and one to enable
IORING_OP_URING_CMD for /dev/null.  The last patch, the /dev/null
support, is obviously not critical but it makes testing so much
easier and I believe is in keeping with the general motivation behind
/dev/null.

Luis' patch has already been vetted by Jens and the io_uring folks,
so the only new bits are the SELinux implementation and the trivial
/dev/null implementation of IORING_OP_URING_CMD.  Assuming no one
has any objections over the next few days, I'll plan on sending this
up to Linus during the v6.0-rcX cycle.

I believe Casey is also currently working on Smack support for the
IORING_OP_URING_CMD hook, and as soon as he is ready I can add it
to this patchset (or Casey can send it up himself).

-Paul

---

Luis Chamberlain (1):
      lsm,io_uring: add LSM hooks for the new uring_cmd file op

Paul Moore (2):
      selinux: implement the security_uring_cmd() LSM hook
      /dev/null: add IORING_OP_URING_CMD support


 drivers/char/mem.c                  |  6 ++++++
 include/linux/lsm_hook_defs.h       |  1 +
 include/linux/lsm_hooks.h           |  3 +++
 include/linux/security.h            |  5 +++++
 io_uring/uring_cmd.c                |  5 +++++
 security/security.c                 |  4 ++++
 security/selinux/hooks.c            | 24 ++++++++++++++++++++++++
 security/selinux/include/classmap.h |  2 +-
 8 files changed, 49 insertions(+), 1 deletion(-)