https://bugs.openldap.org/show_bug.cgi?id=9639
--- Comment #2 from dpa-openldap@aegee.org dpa-openldap@aegee.org --- The chroot’ed environment is never provided by the OS.
As far as I can see, at least /dev/null must be within the chrooted environment.
Each software has different requirements on what needs to be in the chroot’ed environment.