[Bug 1724013] [NEW] mount does not correctly process x-* options

[DaytonaJohn]

Public bug reported:

According to the mount(8) man page:

All options prefixed with "x-" are interpreted as comments or as
userspace application-specific options.  These options are not stored
in  the  mtab  file,  nor  sent  to  the mount.type helpers nor to the
mount(2) system call.  The suggested format is x-appname.option (e.g.
x-systemd.automount).

However, adding any such option to cifs entry, such as "x-test.opt"
(other than x-systemd.automount) results in:

mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

No options starting with "x-" should be passed to mount.cifs, so the
mount should succeed.

Running Ubuntu 16.04.3 LTS
mount package installed is 2.27.1-6ubuntu3.3

This error always happens when such an option is specified. Here is an example fstab line that causes this failure:
//192.168.1.3/Public    /mnt/mybook    cifs   noauto,x-test.opt,rw,users,noperm,guest,soft,cache=none,sec=none  0  0

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mount 2.27.1-6ubuntu3.3
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Oct 16 12:29:40 2017
InstallationDate: Installed on 2016-04-22 (542 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/usr/bin/tcsh
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug fstab mount xenial

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https://bugs.launchpad.net/bugs/1724013

Title:
  mount does not correctly process x-* options

Status in util-linux package in Ubuntu:
  New

Bug description:
  According to the mount(8) man page:

  All options prefixed with "x-" are interpreted as comments or as
  userspace application-specific options.  These options are not stored
  in  the  mtab  file,  nor  sent  to  the mount.type helpers nor to the
  mount(2) system call.  The suggested format is x-appname.option (e.g.
  x-systemd.automount).

  However, adding any such option to cifs entry, such as "x-test.opt"
  (other than x-systemd.automount) results in:

  mount error(22): Invalid argument
  Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

  No options starting with "x-" should be passed to mount.cifs, so the
  mount should succeed.

  Running Ubuntu 16.04.3 LTS
  mount package installed is 2.27.1-6ubuntu3.3

  This error always happens when such an option is specified. Here is an example fstab line that causes this failure:
  //192.168.1.3/Public    /mnt/mybook    cifs   noauto,x-test.opt,rw,users,noperm,guest,soft,cache=none,sec=none  0  0

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: mount 2.27.1-6ubuntu3.3
  ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
  Uname: Linux 4.4.0-97-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Mon Oct 16 12:29:40 2017
  InstallationDate: Installed on 2016-04-22 (542 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/usr/bin/tcsh
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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