Public bug reported: At the moment, it seems that mount.ntfs-3g disables -o permissions if -o uid=UUU and/or uid=GGG are also specified. This (combined with Ubuntu's compilation options disallowing user mounts for NTFS-3g) prevents unprivileged users from easily accessing NTFS systems while preserving standard Unix permissions.
root# mount -o uid=500,gid=500,umask=000 /dev/sdb1 /vol/exthd/ root# touch /vol/exthd/x root# ls -al /vol/exthd/x -rwxrwxrwx 1 muresan muresan 0 Dec 8 00:29 /vol/exthd/x root# chmod u-x /vol/exthd/x root# ls -al /vol/exthd/x -rwxrwxrwx 1 muresan muresan 0 Dec 8 00:29 /vol/exthd/x So chmod is ignored and all permissions are fixed to rwx. With "mount -o permissions", permissions ARE preserved, but all files are owned by root: root# mount -o permissions /dev/sdb1 /vol/exthd Using default user mapping root# touch /vol/exthd/x root# ls -al /vol/exthd/x -rw--w--w- 1 root root 0 Dec 8 00:29 /vol/exthd/x root# chmod u+x /vol/exthd/x root# ls -al /vol/exthd/x -rwx-w--w- 1 root root 0 Dec 8 00:29 /vol/exthd/x root# rm /vol/exthd/x root# ls -al /bin/bash -rwxr-xr-x 1 root root 920788 Apr 3 2012 /bin/bash root# cp -a /bin/bash /vol/exthd/ root# ls -al /vol/exthd/bash -rwxr-xr-x 1 root root 920788 Apr 3 2012 /vol/exthd/bash root# umount /vol/exthd Trying to mount the filesystem as an unprivileged user results in: Either mount the volume as root, or rebuild NTFS-3G with integrated FUSE support and make it setuid root. Please see more information at http://tuxera.com/community/ntfs-3g-faq/#unprivileged ** Affects: ntfs-3g (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1087915 Title: Can't combine -o permissions with -o uid=UUU,gid=GGG To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ntfs-3g/+bug/1087915/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
