[PATCH 00/12] attr: group fix backport

[Christian Brauner <brauner@kernel.org>]

From: "Christian Brauner (Microsoft)" <brauner@kernel.org>

Hey Greg,

As promised, here is a series that allows to backport the fix which
failed to build for you. This backports a few patches that are required
to make this work. I decided to backport them instead of rolling a
custom fix for this. That would've been smaller but there is future
hardening work that I would like to backport and this enables this.

I've run xfstests for ext4, xfs, and btrfs as well as LTP with:
runltp -f fs_perms_simple,fs_bind,containers,cap_bounds,cve,uevent,filecaps
and I see no regressions. There is an xfs failure but that is related to
a - for obvious reasons - missing stable backport.

Thanks!
Christian

Christian Brauner (12):
  fs: add is_idmapped_mnt() helper
  fs: move mapping helpers
  fs: tweak fsuidgid_has_mapping()
  fs: account for filesystem mappings
  docs: update mapping documentation
  fs: use low-level mapping helpers
  fs: remove unused low-level mapping helpers
  fs: port higher-level mapping helpers
  fs: add i_user_ns() helper
  fs: support mapped mounts of mapped filesystems
  fs: fix acl translation
  fs: account for group membership

 Documentation/filesystems/idmappings.rst |  72 -------
 fs/attr.c                                |  26 ++-
 fs/cachefiles/bind.c                     |   2 +-
 fs/ecryptfs/main.c                       |   2 +-
 fs/ksmbd/smbacl.c                        |  19 +-
 fs/ksmbd/smbacl.h                        |   5 +-
 fs/namespace.c                           |  53 +++--
 fs/nfsd/export.c                         |   2 +-
 fs/open.c                                |   8 +-
 fs/overlayfs/super.c                     |   2 +-
 fs/posix_acl.c                           |  27 ++-
 fs/proc_namespace.c                      |   2 +-
 fs/xattr.c                               |   6 +-
 fs/xfs/xfs_inode.c                       |   8 +-
 fs/xfs/xfs_linux.h                       |   1 +
 fs/xfs/xfs_symlink.c                     |   4 +-
 include/linux/fs.h                       | 141 ++++----------
 include/linux/mnt_idmapping.h            | 234 +++++++++++++++++++++++
 include/linux/posix_acl_xattr.h          |   4 +
 security/commoncap.c                     |  15 +-
 20 files changed, 394 insertions(+), 239 deletions(-)
 create mode 100644 include/linux/mnt_idmapping.h


base-commit: 18a33c8dabb88b50b860e0177a73933f2c0ddf68
-- 
2.34.1