SELinux labels not defined

[David Michael <fedora.dm0@gmail.com>]

Hi,

I tried to make an SELinux-labeled EROFS image, and the image itself
seems to contain the labels from a hex dump, but the mounted files are
all unlabeled:

# ls -lZ xml
total 8
drwxr-xr-x. 2 root root unconfined_u:object_r:var_t:s0         4096 Sep 29 21:43 dbus-1
drwxr-xr-x. 2 root root unconfined_u:object_r:fonts_cache_t:s0 4096 Sep 29 22:19 fontconfig
# mkfs.erofs test.img xml
mkfs.erofs 1.3-g4e183568-dirty
	c_version:           [1.3-g4e183568-dirty]
	c_dbg_lvl:           [       2]
	c_dry_run:           [       0]
# mount -o X-mount.mkdir test.img test
# ls -lZ test
total 8
drwxr-xr-x. 2 root root system_u:object_r:unlabeled_t:s0 78 Oct  2 18:37 dbus-1
drwxr-xr-x. 2 root root system_u:object_r:unlabeled_t:s0 48 Oct  2 18:37 fontconfig

This is running on the current Fedora kernel 5.14.9-200.fc34.x86_64 with
the relevant config options:

CONFIG_EROFS_FS=m
# CONFIG_EROFS_FS_DEBUG is not set
CONFIG_EROFS_FS_XATTR=y
CONFIG_EROFS_FS_POSIX_ACL=y
CONFIG_EROFS_FS_SECURITY=y
CONFIG_EROFS_FS_ZIP=y

I tried the earliest kernel in Fedora 34 (5.11.12-300.fc34.x86_64), and
it also has the same issue.  However, the earliest kernel in Fedora 33
(5.8.15-301.fc33.x86_64) has the correct labels when the image is
mounted.  Is there a problem in the file system driver, or do I need to
do something different for newer kernels?

Thanks.

David