Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
Ntfs mount error[solved]
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Other Things Gentoo
View previous topic :: View next topic  
Author Message
pelargos
Tux's lil' helper
Tux's lil' helper


Joined: 06 Jul 2012
Posts: 129

PostPosted: Mon Sep 24, 2012 5:17 pm    Post subject: Ntfs mount error[solved] Reply with quote

Hi guys when i go to mount a ntfs filesystem i have this error:
Error mounting: mount exited with exit code 1: helper failed with:
Unprivileged user can not mount NTFS block devices using the external FUSE
library. 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
.


Help :D

On my kernel i've enabled fuse (not as module)
and i enabled ntfs and write support.
Also i've installed fuse and ntfs3g.


Last edited by pelargos on Tue Sep 25, 2012 8:34 pm; edited 1 time in total
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 31907
Location: 56N 3W

PostPosted: Mon Sep 24, 2012 5:31 pm    Post subject: Reply with quote

pelargos,

kernel ntfs is read only, writing is limited to changing the content of existing files without changing the file size.

If mount uses -t ntfs, the kernel ntfs driver will be used.
if mount uses -t ntfs3g then ntfd-3g and FUSE is used.

In either case, only root can mount things buy default.

How are you trying to execute the mount command?
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
pelargos
Tux's lil' helper
Tux's lil' helper


Joined: 06 Jul 2012
Posts: 129

PostPosted: Mon Sep 24, 2012 5:50 pm    Post subject: Reply with quote

NeddySeagoon wrote:
pelargos,

kernel ntfs is read only, writing is limited to changing the content of existing files without changing the file size.

If mount uses -t ntfs, the kernel ntfs driver will be used.
if mount uses -t ntfs3g then ntfd-3g and FUSE is used.

In either case, only root can mount things buy default.

How are you trying to execute the mount command?


mount /home/user/usb

as root only it works
But i want also to work as regular user.
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 31907
Location: 56N 3W

PostPosted: Mon Sep 24, 2012 6:40 pm    Post subject: Reply with quote

pelargos
http://www.tuxera.com/community/ntfs-3g-faq/#unprivileged wrote:
Why do I get “fusermount: option blkdev is privileged” error?

Unprivileged block device mounts work only if all the below requirements are met:

ntfs-3g is compiled with integrated FUSE support
the ntfs-3g binary is at least version 1.2506
the ntfs-3g binary is set to setuid-root
the user has access right to the volume
the user has access right to the mount point

The root user can make an ntfs-3g binary setuid-root as shown below
chown root $(which ntfs-3g)
chmod 4755 $(which ntfs-3g) In such case the driver will also be able

to fix common FUSE kernel module loading problems
to create the required but sometimes incorrectly removed or missing FUSE device file

Please note that using setuid-root can result unforeseen privilege escalation and its usage is discouraged. Only the absolutely trusted users must be granted such access. Below is an example how this can be done for users in the ntfsuser group to be able to mount any NTFS volume if they have also the needed volume access rights. chown root.ntfsuser $(which ntfs-3g)
chmod 4750 $(which ntfs-3g) The setuid-root ntfs-3g driver applies the principle of least privilege during its lifetime as a safety measure.


We know that
Quote:
ntfs-3g is compiled with integrated FUSE support
is not met as you have FUSE support in the kernel.

See the warning at the end. SUID is horrible.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
pelargos
Tux's lil' helper
Tux's lil' helper


Joined: 06 Jul 2012
Posts: 129

PostPosted: Tue Sep 25, 2012 8:50 am    Post subject: Reply with quote

NeddySeagoon wrote:
pelargos
http://www.tuxera.com/community/ntfs-3g-faq/#unprivileged wrote:
Why do I get “fusermount: option blkdev is privileged” error?

Unprivileged block device mounts work only if all the below requirements are met:

ntfs-3g is compiled with integrated FUSE support
the ntfs-3g binary is at least version 1.2506
the ntfs-3g binary is set to setuid-root
the user has access right to the volume
the user has access right to the mount point

The root user can make an ntfs-3g binary setuid-root as shown below
chown root $(which ntfs-3g)
chmod 4755 $(which ntfs-3g) In such case the driver will also be able

to fix common FUSE kernel module loading problems
to create the required but sometimes incorrectly removed or missing FUSE device file

Please note that using setuid-root can result unforeseen privilege escalation and its usage is discouraged. Only the absolutely trusted users must be granted such access. Below is an example how this can be done for users in the ntfsuser group to be able to mount any NTFS volume if they have also the needed volume access rights. chown root.ntfsuser $(which ntfs-3g)
chmod 4750 $(which ntfs-3g) The setuid-root ntfs-3g driver applies the principle of least privilege during its lifetime as a safety measure.


We know that
Quote:
ntfs-3g is compiled with integrated FUSE support
is not met as you have FUSE support in the kernel.

See the warning at the end. SUID is horrible.


I don't understand x'(
Back to top
View user's profile Send private message
Aquous
l33t
l33t


Joined: 08 Jan 2011
Posts: 646

PostPosted: Tue Sep 25, 2012 9:14 am    Post subject: Reply with quote

All you have to do is emerge ntfs3g with USE=-external-fuse and run these commands afterwards:
Code:
chown root $(which ntfs-3g)
chmod 4755 $(which ntfs-3g)

This will enable automounting but it's also less secure.
Back to top
View user's profile Send private message
pelargos
Tux's lil' helper
Tux's lil' helper


Joined: 06 Jul 2012
Posts: 129

PostPosted: Tue Sep 25, 2012 3:21 pm    Post subject: Reply with quote

Aquous wrote:
All you have to do is emerge ntfs3g with USE=-external-fuse and run these commands afterwards:
Code:
chown root $(which ntfs-3g)
chmod 4755 $(which ntfs-3g)

This will enable automounting but it's also less secure.


Why is it less secure?
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 31907
Location: 56N 3W

PostPosted: Tue Sep 25, 2012 5:57 pm    Post subject: Reply with quote

pelargos,

ntfs-3g runs as the root user, regardless of which user actually starts it.

It means that any user can run it and mount any ntfs filesystem read/write. Thy can ten steal your data and potentially run any programes they care to on your system. This is a very bad thing.

sudo is a better security solution as you can have very fine control over who can do what as root. For example, on named trusted individual users would be able to run ntfs-3g.

Security is a trade off with usability, you need to choose where on that scale you want to be.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
pelargos
Tux's lil' helper
Tux's lil' helper


Joined: 06 Jul 2012
Posts: 129

PostPosted: Tue Sep 25, 2012 8:33 pm    Post subject: Reply with quote

NeddySeagoon wrote:
pelargos,

ntfs-3g runs as the root user, regardless of which user actually starts it.

It means that any user can run it and mount any ntfs filesystem read/write. Thy can ten steal your data and potentially run any programes they care to on your system. This is a very bad thing.

sudo is a better security solution as you can have very fine control over who can do what as root. For example, on named trusted individual users would be able to run ntfs-3g.

Security is a trade off with usability, you need to choose where on that scale you want to be.


OK man thanks a lot for the info. My head is fine now. :)
Back to top
View user's profile Send private message
pelargos
Tux's lil' helper
Tux's lil' helper


Joined: 06 Jul 2012
Posts: 129

PostPosted: Fri Sep 28, 2012 8:59 am    Post subject: Reply with quote

NeddySeagoon wrote:
pelargos,

ntfs-3g runs as the root user, regardless of which user actually starts it.

It means that any user can run it and mount any ntfs filesystem read/write. Thy can ten steal your data and potentially run any programes they care to on your system. This is a very bad thing.

sudo is a better security solution as you can have very fine control over who can do what as root. For example, on named trusted individual users would be able to run ntfs-3g.

Security is a trade off with usability, you need to choose where on that scale you want to be.


hey NeaddySeagoon i have an idea but i want your help. I want to create a launcher that it automatically mounts the ntfs-3g from the commands. Can you help me?
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 31907
Location: 56N 3W

PostPosted: Fri Sep 28, 2012 7:57 pm    Post subject: Reply with quote

pelargos,

I cannot help very much as I have no way to test. I don't have any NTFS filesystems.

If ntfs-3g is set up properly, automouting should work. Automounting is another feature I don't use as it kills DVD+RW media used like a 4.7G floppy.
Each RW mount causes a superblock write, so you only get about 1000 mounts.
With low cost SD and USB sticks, I don't use DVD+RW as much as I once did.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
rsa4046
l33t
l33t


Joined: 07 Feb 2005
Posts: 640
Location: The Big H, a bit SSW

PostPosted: Sun Oct 21, 2012 10:34 am    Post subject: Reply with quote

NeddySeagoon wrote:
We know that
Quote:
ntfs-3g is compiled with integrated FUSE support
is not met as you have FUSE support in the kernel.

Neddy-is the Gentoo wiki page on ntfs-3g, which indicates inclusion of kernel FUSE support to get (auto)mounting by user, then wrong/outdated? Thanks-
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Other Things Gentoo All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum