[Bug 2055226] Re: mount option `users` blocks ntfs to mount

[UlfZibis]

In the latest man pages I recently found:

Since util-linux 2.35, mount does not exit when user permissions are
inadequate according to libmount’s internal security rules. Instead, it
drops suid permissions and continues as regular non-root user. This
behavior supports use-cases where root permissions are not necessary
(e.g., fuse filesystems, user namespaces, etc).

With this new rule the "regression" concerning `mount` is explainable.

So please add a link to this note at the description of the `user(s)`
options.

Still existing: The buggy behaviour with `udisksctl mount`.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to util-linux in Ubuntu.
https://bugs.launchpad.net/bugs/2055226

Title:
  mount option `users` blocks ntfs to mount

Status in util-linux package in Ubuntu:
  New

Bug description:
  /etc/fstab:
  # /media/Sicherung was on /dev/sda7 during installation
  UUID=2510AA16624BB80C /media/Sicherung ntfs defaults,users,noauto,windows_names,hide_dot_files 0 0

  $ gio mount -d /dev/sda7
  gio: /dev/sda7: Error mounting system-managed device /dev/sda7: Unknown error when mounting /media/Sicherung

  $ udisksctl mount -b /dev/sda7
  Error mounting /dev/sda7: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error mounting system-managed device /dev/sda7: Unknown error when mounting /media/Sicherung

  $ journalctl -b 0 -u udisks2.service
  Feb 27 23:48:51 T500 udisksd[10478]: Error opening read-only '/dev/sda7': Keine Berechtigung
  Feb 27 23:48:51 T500 udisksd[10478]: Failed to mount '/dev/sda7': Keine Berechtigung
  Feb 27 23:48:51 T500 udisksd[10478]: Please check '/dev/sda7' and the ntfs-3g binary permissions,
  Feb 27 23:48:51 T500 udisksd[10478]: and the mounting user ID. More explanation is provided at
  Feb 27 23:48:51 T500 udisksd[10478]: https://github.com/tuxera/ntfs-3g/wiki/NTFS-3G-FAQ

  This worked fine until Ubuntu 20.04, but since 22.04 I have these
  errors.

  Additionally, mount option `users` does not, what it should do:

  $ LC_ALL=C mount /media/Sicherung
  Error opening read-only '/dev/sda7': Permission denied
  Failed to mount '/dev/sda7': Permission denied
  Please check '/dev/sda7' and the ntfs-3g binary permissions,
  and the mounting user ID. More explanation is provided at
  https://github.com/tuxera/ntfs-3g/wiki/NTFS-3G-FAQ

  When removing `users` from /etc/fstab, it works fine:

  $ gio mount -d /dev/sda7
  $ LC_ALL=C journalctl -b 0 -u udisks2.service
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Version 2021.8.22 integrated FUSE 28
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Mounted /dev/sda7 (Read-Write, label "Sicherung", NTFS 3.1)
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Cmdline options: rw,windows_names,hide_dot_files
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Mount options: allow_other,nonempty,relatime,rw,fsname=/dev/sda7,blkdev,blksize=4096
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Ownership and permissions disabled, configuration type 7
  Feb 28 00:05:31 T500 udisksd[583]: Mounted /dev/sda7 (system) at /media/Sicherung on behalf of uid 1000

  So it seems, that option `users` virtually effectuates the opposite,
  than it is supposed to do.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/2055226/+subscriptions