v2: Add static to struct kmem_cache *lsm_backing_file_cache; and define
lbs_backing_file as int for keeping the same type as 6.18.

Backport the patch series
"Fix incorrect overlayfs mmap() and mprotect() LSM access controls" [1]
to 6.18 lts

I test selinux-testsuite[2] overlay test, it pass 135 tests.

[1] https://lore.kernel.org/all/20260403030848.731867-5-paul@paul-moore.com/ (local)
[2] https://github.com/SELinuxProject/selinux-testsuite

Paul Moore (2):
  lsm: add backing_file LSM hooks
  selinux: fix overlayfs mmap() and mprotect() access checks

 fs/backing-file.c                 |  17 ++-
 fs/file_table.c                   |  27 +++-
 fs/fuse/passthrough.c             |   2 +-
 fs/internal.h                     |   3 +-
 fs/overlayfs/dir.c                |   2 +-
 fs/overlayfs/file.c               |   2 +-
 include/linux/backing-file.h      |   4 +-
 include/linux/fs.h                |  13 ++
 include/linux/lsm_audit.h         |   2 +-
 include/linux/lsm_hook_defs.h     |   5 +
 include/linux/lsm_hooks.h         |   1 +
 include/linux/security.h          |  22 +++
 security/security.c               | 109 ++++++++++++++
 security/selinux/hooks.c          | 242 ++++++++++++++++++++++--------
 security/selinux/include/objsec.h |  11 ++
 15 files changed, 383 insertions(+), 79 deletions(-)

-- 
2.18.0.huawei.25