Created attachment 172306 [details] reject FS fields that end with a / update exports man page If the last character in the file system fields (the first set of fields) from /etc/exports ends with a / (other than root) then the exported nfs file system can't be mounted on a remote system. mountd(8) happily accepts lines from /etc/exports if the last character in the file system fields is /. Other than / itself are there any valid cases where the fs field should/can end with a /? NFS Server(nfssrv): # cat /etc/exports /mnt/backups/isos -ro -mapall=nobody -network 10..... NFS Client(nfscli): $ sudo mount nfssrv:/mnt/backups/isos/ /tmp/ mount_nfs: can't mount /mnt/backups/isos/ from nfssrv onto /private/tmp: Permission denied NFS Server rejecting a line with a FS ending with a /: ..... mountd[66457]: bad exports list line /mnt/backups/isos/ With patch mountd NFS Server from /var/log/messages: ........ mountd[17841]: mount request denied from nfscli for /mnt/backups/isos Removing the / fixes the issue. See the attached patch to update mountd.c:check_dirpath to reject lines and exports.5 explaining file system fields shouldn't end with / other than root. I have only tested the patch with 10.3-RELEASE (nfs server) and Mac OS X (client). It seems this isn't a client issue (same problem with Linux NFS clients) based off other forum posts. Also, it appears the patch should apply to (10|11)-STABLE and CURRENT.