Ubuntu

Permission problems with mounted NTFS partitions on dual-boot

Asked by jrdecastro

I have a triple boot system with Ubuntu 8.04, Windows XP 32, and XP 64, and mounted three RAID1 NTFS partitions so I can access them from Ubuntu (by including them in /etc/fstab)
The three directories are XP32C (the XP C:drive), XP32Data (the XP D: drive) and XP64 (the XP 64 bit home drive). All three are NTFS, and Ubuntu lives in a separate, non RAID disk formatted with ext3.

The problem is with permissions. Ubuntu seems to set none for the Windows directories. I can access the Windows directories from my account (which has administrative privileges), but also if I log on from a guest account which has no privileges of any kind. How do I protect these directories so that only my account (or one with administrative privileges, and certainly not the guest account) can mess with them?

If I right-click on any of the mounted NTFS drives, say XP32C, from Nautilus and select "properties" then "permissions" it says "the permissions of "XP32C" could not be determined".

This behaviour seems more than a bit unsafe - is there any way to fix it and have Linux apply some sort of permissions to the mounted NTFS partitions?

Thanks!

cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sdc1
UUID=40fa1aac-1681-4690-9b3b-6209d795da71 / ext3 relatime,errors=remount-ro 0 1
# /dev/sdc5
UUID=ccc25a40-e40e-41cc-a37a-d24a1b6c6135 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
/dev/sdd /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
/dev/mapper/isw_dfcgijeijg_Volume0:11 /media/XP32C ntfs defaults 0 0
/dev/mapper/isw_dfcgijeijg_Volume0:15 /media/XP32Data ntfs defaults 0 0
/dev/mapper/isw_dfcgijeijg_Volume0:16 /media/XP64 ntfs defaults 0 0

cat /proc/mounts
rootfs / rootfs rw 0 0
none /sys sysfs rw,nosuid,nodev,noexec 0 0
none /proc proc rw,nosuid,nodev,noexec 0 0
udev /dev tmpfs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/disk/by-uuid/40fa1aac-1681-4690-9b3b-6209d795da71 / ext3 rw,relatime,errors=remount-ro,data=ordered 0 0
/dev/disk/by-uuid/40fa1aac-1681-4690-9b3b-6209d795da71 /dev/.static/dev ext3 rw,relatime,errors=remount-ro,data=ordered 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /lib/modules/2.6.24-19-generic/volatile tmpfs rw,relatime 0 0
tmpfs /dev/shm tmpfs rw,relatime 0 0
devpts /dev/pts devpts rw,relatime 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
/dev/mapper/isw_dfcgijeijg_Volume0:11 /media/XP32C fuseblk rw,nosuid,nodev,noatime,relatime,user_id=0,group_id=0,allow_other 0 0
/dev/mapper/isw_dfcgijeijg_Volume0:15 /media/XP32Data fuseblk rw,nosuid,nodev,noatime,relatime,user_id=0,group_id=0,allow_other 0 0
/dev/mapper/isw_dfcgijeijg_Volume0:16 /media/XP64 fuseblk rw,nosuid,nodev,noatime,relatime,user_id=0,group_id=0,allow_other 0 0
securityfs /sys/kernel/security securityfs rw,relatime 0 0
gvfs-fuse-daemon /home/jrc/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0

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Tony Pursell
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Best Tony Pursell (ajpursell) said : 		#1

Hi

I'm sorry I can't give you a solution, but I can give you a partial explanation which may help you.

If you look at 'man ntfs-3g' you will see that the 'allow_other' mount option "overrides the security measure restricting file access to the user mounting the filesystem". Without this option, only root (user_id=0,group_id=0) would have access to the ntfs drives.

Unfortunately. I haven't been able to find out how the system adds 'allow_other' and the other mount options. /etc/fstab only has the option 'defaults'. In 'man mount' you will see this equates to "rw, suid, dev, exec, auto, nouser, and async" and not the options revealed in /proc/mounts.

I have tried going to Nautilus and selecting "properties" , then the 'Volume' tab, expanding 'Settings' and changing the mount options but that did not help. Perhaps you might find a way with the pointers I have been able to give you.

Tony

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jrdecastro (decastro-netvigator) said : 		#2

Thanks Tony Pursell, that solved my question.

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Peter Swinkels (peter-swinkels) said : 		#3

jrdecastro, I have the same problem as you did, how did you solve the problem?