Red Hat Bugzilla – Bug 1496822
mount.nfs calls mount() with nfsvers setting from nfsmount.conf appended to version specified on command line
Last modified: 2018-04-10 14:22:28 EDT
Description of problem: When the 'nfsvers=' configuration setting is present in the /etc/nfsmount.conf file, calling mount.nfs with an nfs version specified will result in mount.nfs calling mount() with the version from nfsmount.conf appended to the option provided to mount.nfs. Version-Release number of selected component (if applicable): nfs-utils-1.3.0-0.48.el7.x86_64 How reproducible: see below Steps to Reproduce: create or set the nfsvers= line in /etc/nfsmount.conf call mount with a version specified as an option Actual results: mount() syscall is made with 'nfsvers' configuration option appended # egrep -i ^nfsvers /etc/nfsmount.conf Nfsvers=4 # mount -vvvv -t nfs nfsserver:/exports /mnt/tmp -o vers=3 mount.nfs: timeout set for Thu Sep 28 08:07:48 2017 mount.nfs: trying text-based options 'vers=3,nfsvers=4,addr=192.168.122.72' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying 192.168.122.72 prog 100003 vers 3 prot TCP port 2049 mount.nfs: prog 100005, trying vers=3, prot=17 mount.nfs: trying 192.168.122.72 prog 100005 vers 3 prot UDP port 20048 # egrep -i ^nfsvers /etc/nfsmount.conf Nfsvers=3 # strace -qfttTvys 1024 -etrace=mount mount -vvvv -t nfs nfsserver:/exports /mnt/tmp -o vers=4.0 mount.nfs: timeout set for Thu Sep 28 08:20:34 2017 mount.nfs: trying text-based options 'vers=4.0,nfsvers=3,addr=192.168.122.72,clientaddr=192.168.122.73' [pid 10451] 08:18:34.233533 mount("nfsserver:/exports", "/mnt/tmp", "nfs", 0, "vers=4.0,nfsvers=3,addr=192.168.122.72,clientaddr=192.168.122.73") = 0 <0.010063> # grep nfsserver /proc/mounts nfsserver:/exports /mnt/tmp nfs rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.122.72,mountvers=3,mountproto=tcp,local_lock=none,addr=192.168.122.72 0 0 # egrep -i ^nfsvers /etc/nfsmount.conf Nfsvers=3 # strace -qfttTvys 1024 -etrace=mount mount -vvvv -t nfs nfsserver:/exports /mnt/tmp -o vers=4.1 mount.nfs: timeout set for Thu Sep 28 08:21:59 2017 mount.nfs: trying text-based options 'vers=4.1,nfsvers=3,addr=192.168.122.72,clientaddr=192.168.122.73' [pid 10492] 08:19:59.288583 mount("nfsserver:/exports", "/mnt/tmp", "nfs", 0, "vers=4.1,nfsvers=3,addr=192.168.122.72,clientaddr=192.168.122.73") = -1 EINVAL (Invalid argument) <0.002484> mount.nfs: mount(2): Invalid argument mount.nfs: an incorrect mount option was specified [pid 10492] 08:19:59.293117 +++ exited with 32 +++ Expected results: version specified as command-line option overrides default options in nfsmount.conf, and only one version is provided in the call to mount() Additional info:
This problem also exists in Fedora 26. Looks like it only occurs when specifying the minor version while it can parse successfully with "-o vers=4" or "-t nfs4" [root@fedora26 ~]# cat /etc/redhat-release Fedora release 26 (Twenty Six) [root@fedora26 ~]# rpm -q nfs-utils nfs-utils-2.1.1-5.rc5.fc26.x86_64 [root@fedora26 ~]# [root@fedora26 ~]# egrep -i ^nfsvers /etc/nfsmount.conf Nfsvers=3 [root@fedora26 ~]# mount -t nfs localhost:/export_test /mnt/ -o vers=4 -vvv mount.nfs: timeout set for Thu Sep 28 20:35:06 2017 mount.nfs: trying text-based options 'vers=4.2,addr=::1,clientaddr=::1' [root@fedora26 ~]# cat /proc/mounts | grep mnt localhost:/export_test /mnt nfs4 rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,port=0,timeo=600,retrans=2,sec=sys,clientaddr=::1,local_lock=none,addr=::1 0 0 [root@fedora26 ~]# umount /mnt/ [root@fedora26 ~]# ################## Reproduced! [root@fedora26 ~]# mount -t nfs localhost:/export_test /mnt/ -o vers=4.0 -vvv mount.nfs: timeout set for Thu Sep 28 20:35:28 2017 mount.nfs: trying text-based options 'vers=4.0,nfsvers=3,addr=::1,clientaddr=::1' <<<<<< [root@fedora26 ~]# cat /proc/mounts | grep mnt localhost:/export_test /mnt nfs rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,timeo=600,retrans=2,sec=sys,mountaddr=::1,mountvers=3,mountproto=tcp6,local_lock=none,addr=::1 0 0 [root@fedora26 ~]# umount /mnt/ [root@fedora26 ~]# mount -t nfs localhost:/export_test /mnt/ -o vers=4.2 -vvv mount.nfs: timeout set for Thu Sep 28 20:36:08 2017 mount.nfs: trying text-based options 'vers=4.2,nfsvers=3,addr=::1,clientaddr=::1' <<<<<< mount.nfs: mount(2): Invalid argument mount.nfs: an incorrect mount option was specified [root@fedora26 ~]# cat /proc/mounts | grep mnt [root@fedora26 ~]# cat /proc/fs/nfsd/versions -2 +3 +4 +4.1 +4.2 [root@fedora26 ~]#
Patch posted upstream http://www.spinics.net/lists/linux-nfs/msg65755.html
The upstream commit.... commit 8110103404b35d9e86057ef0764f8aa87585f455 Author: Justin Mitchell <jumitche@redhat.com> Date: Thu Oct 5 10:40:51 2017 -0400 mount.nfs: merge in vers= and nfsvers= options
verified with nfs-utils-1.3.0-0.50.el7 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [01:46:03 root@ ~~]# cat /etc/nfsmount.conf [ Server "localhost" ] Nfsvers=3 [01:46:03 root@ ~~]# mount.nfs localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf -vvv -o vers=3 mount.nfs: trying ::1 prog 100003 vers 3 prot TCP port 2049 mount.nfs: trying ::1 prog 100005 vers 3 prot UDP port 20048 mount.nfs: timeout set for Thu Oct 19 01:48:03 2017 mount.nfs: trying text-based options 'vers=3,addr=::1' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: prog 100005, trying vers=3, prot=17 [01:46:03 root@ ~~]# cat /proc/mounts | grep /mnt/nfsmp-nfsmount-conf localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf nfs rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,timeo=600,retrans=2,sec=sys,mountaddr=::1,mountvers=3,mountport=20048,mountproto=udp6,local_lock=none,addr=::1 0 0 ^^^^^^^^^^^^^^^^^^^^^^^^ Mounted with nfsvers 3, expected as 3 [01:46:03 root@ ~~]# umount /mnt/nfsmp-nfsmount-conf [01:46:03 root@ ~~]# mount.nfs localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf -vvv -o vers=4.0 mount.nfs: timeout set for Thu Oct 19 01:48:03 2017 mount.nfs: trying text-based options 'vers=4.0,addr=::1,clientaddr=::1' [01:46:03 root@ ~~]# cat /proc/mounts | grep /mnt/nfsmp-nfsmount-conf localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf nfs4 rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,port=0,timeo=600,retrans=2,sec=sys,clientaddr=::1,local_lock=none,addr=::1 0 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^ Mounted with nfsvers 4.0, expected as 4.0 [01:46:03 root@ ~~]# umount /mnt/nfsmp-nfsmount-conf [01:46:03 root@ ~~]# mount.nfs localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf -vvv -o vers=4.1 mount.nfs: timeout set for Thu Oct 19 01:48:03 2017 mount.nfs: trying text-based options 'vers=4.1,addr=::1,clientaddr=::1' [01:46:03 root@ ~~]# cat /proc/mounts | grep /mnt/nfsmp-nfsmount-conf localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf nfs4 rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,port=0,timeo=600,retrans=2,sec=sys,clientaddr=::1,local_lock=none,addr=::1 0 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^ Mounted with nfsvers 4.1, expected as 4.1 [01:46:03 root@ ~~]# umount /mnt/nfsmp-nfsmount-conf [01:46:04 root@ ~~]# mount.nfs localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf -vvv -o vers=4.2 mount.nfs: timeout set for Thu Oct 19 01:48:04 2017 mount.nfs: trying text-based options 'vers=4.2,addr=::1,clientaddr=::1' [01:46:04 root@ ~~]# cat /proc/mounts | grep /mnt/nfsmp-nfsmount-conf localhost:/exportDir-nfsmount-conf /mnt/nfsmp-nfsmount-conf nfs4 rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp6,port=0,timeo=600,retrans=2,sec=sys,clientaddr=::1,local_lock=none,addr=::1 0 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^ Mounted with nfsvers 4.2, expected as 4.2 [01:46:04 root@ ~~]# umount /mnt/nfsmp-nfsmount-conf
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0981