This is an example of the directory layout for the chroot/etc directory of a SELinux UML instance. should be generated with ldconfig -r.
localtime is not required generally, but adding it makes chrooting into a shell more practical.
Generally, nsswitch.conf can be copied from the host as is.
The pam configuration files are only needed if there are binaries that use pam.

drwxr-xr-x   3 root root   .
drwxr-xr-x  12 root root   ..
-rw-r--r--   1 root root   group
-rw-r--r--   1 root root
-rw-r--r--   1 root root   localtime
-rw-r--r--   1 root root   login.defs
-rw-r--r--   1 root root   nsswitch.conf
drwxr-xr-x   2 root root   pam.d
-rw-r--r--   1 root root   passwd
drwxr-xr-x   2 root root   security
-rw-------   1 root root   shadow