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DAharon
Apprentice
Joined: 17 Jun 2004
Posts: 155
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 Posted: Tue Jun 28, 2005 11:46 pm Post subject: Problems accessing other partitions and drives |
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Hi, I've had this install of Gentoo for a while now, but I have a problem that I just haven't been able to resolve through experimentation and searching the web and these forums. So I've resorted to posting my problem (even though it should be a no-brainer).
I have two HDs in my computer. hda contains a really old version of RedHat (hda1, ext2), swap space (hda2), and Gentoo(hda3, ReiserFS). hdb contains Windows (hdb1, ntfs) and free space (hdb2, FAT32).
For some reason I just can't get full access to hda1 and hdb2 as a non-root user.
/mnt with drives UNmounted:
| Code: | drwxr-xr-x 2 root cdrom 72 Apr 12 2004 cdrom
drwxrwxrwx 2 root floppy 72 Apr 12 2004 floppy
drwxr-xrwx 2 root root 48 Nov 10 2004 hda1
drwxrwxrwx 2 root root 48 Nov 15 2004 hdb2
drwxr-xr-x 2 root root 48 Nov 15 2004 usb |
/mnt with drives mounted:
| Code: | drwxr-xr-x 2 root cdrom 72 Apr 12 2004 cdrom
drwxrwxrwx 2 root floppy 72 Apr 12 2004 floppy
drwxr-xr-x 20 root users 4096 Nov 10 2004 hda1
drwxr--r-- 16 root root 32768 Jan 1 1970 hdb2
drwxr-xr-x 2 root root 48 Nov 15 2004 usb |
As a user, I can read but not write hda1. I have no access at all to hdb2 as a user.
/etc/fstab:
| Code: |
/dev/hda3 / reiserfs noatime,notail 0 1
/dev/hda2 none swap sw 0 0
#/dev/cdroms/cdrom0 /mnt/cdrom iso9660 auto,ro,users 0 0
#/dev/fd0 /mnt/floppy auto auto,users 0 0
/dev/hda1 /mnt/hda1 auto noatime,users 0 0
/dev/hdb2 /mnt/hdb2 vfat defaults 0 0
#/dev/sda /mnt/usb auto auto,users 0 0 |
I'm not sure how much help fstab is, since I've played with it so many times.
What can I do that will give me full access to hdb2 and hda1? |
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karnesky
Apprentice
Joined: 18 Mar 2004
Posts: 218
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| Posted: Tue Jun 28, 2005 11:55 pm Post subject: |
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| Quote: | | Code: | drwxr-xr-x 20 root users 4096 Nov 10 2004 hda1
drwxr--r-- 16 root root 32768 Jan 1 1970 hdb2 |
As a user, I can read but not write hda1. I have no access at all to hdb2 as a user. |
Well, yeah. The permissions on hda1 aren't g+w and the permissions on hdb2 aren't a+x (to allow you to transverse) or a+w (to write).
The first thing to do is to change the option from "users" to "user,rw". (Note the lack of 's')
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smerf
l33t
Joined: 06 Nov 2004
Posts: 778
Location: Polska
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| Posted: Tue Jun 28, 2005 11:56 pm Post subject: Re: Problems accessing other partitions and drives |
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| Quote: |
/etc/fstab:
| Code: |
/dev/hda3 / reiserfs noatime,notail 0 1
/dev/hda2 none swap sw 0 0
#/dev/cdroms/cdrom0 /mnt/cdrom iso9660 auto,ro,users 0 0
#/dev/fd0 /mnt/floppy auto auto,users 0 0
/dev/hda1 /mnt/hda1 auto noatime,users 0 0
/dev/hdb2 /mnt/hdb2 vfat defaults 0 0
#/dev/sda /mnt/usb auto auto,users 0 0 |
I'm not sure how much help fstab is, since I've played with it so many times.
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I suggest you to read man mount carefully!!! You can set the user who will own files on partition without user/group/world fs access limiting support (like vfat), you can also set correct mode for files, and allow regular non-root users to mount it (BTW: i think it should be 'user' instead of 'users', setting auto for hd with known filesystem is pointless, use name of specific fs). and... please read manual page for mount...
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Microsoft is not the answer, Microsoft is the question, the answer is no. |
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grajagan
Tux's lil' helper
Joined: 19 Jun 2005
Posts: 112
Location: RS/Brasil
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| Posted: Wed Jun 29, 2005 12:00 am Post subject: |
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chmod 777 /dev/hda1
chmod 777 /dev/hdb2
/etc/fstab:
/dev/hda1 /mnt/hda1 auto noatime,users,uid=1000 0 0
/dev/hdb2 /mnt/hdb2 vfat users,uid=1000 0 0
it work's for me  |
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Jas-Nix
Tux's lil' helper
Joined: 05 Feb 2005
Posts: 113
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| Posted: Wed Jun 29, 2005 12:03 am Post subject: |
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I might be WAY OFF here, I have actually never tried this myself, but maybe you can try chmod -R 776 /dev/hdb2 and /dev/hda1
You may have already tried this and if so I apologize for not having a better solution.
Jas-Nix |
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karnesky
Apprentice
Joined: 18 Mar 2004
Posts: 218
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| Posted: Wed Jun 29, 2005 12:13 am Post subject: |
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| Jas-Nix wrote: | | maybe you can try chmod -R 776 /dev/hdb2 and /dev/hda1 |
Careful with that recursive switch! There could be very good reasons why you don't want all subdirectories and files to have full permissions. Also note that hdb2 isn't owned by the users group, so a 776 alone wouldn't fix that. You could do 777 or chown/chgrp it.
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DAharon
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Joined: 17 Jun 2004
Posts: 155
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| Posted: Wed Jun 29, 2005 1:25 am Post subject: |
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Well, I have read the man page for mount, and I have played with this a lot, but I just can't seem to get it to work.
Ok, now I have
| Code: | /dev/hda1 /mnt/hda1 auto user,rw 0 0
/dev/hdb2 /mnt/hdb2 vfat user,rw 0 0 |
in fstab.
With hdb2 UNmounted, I have this:
| Code: | | drwxrwxrwx 2 root users 48 Nov 15 2004 hdb2 |
With hdb2 mounted, it goes straight back to this:
| Code: | | drwxr--r-- 16 root root 32768 Jan 1 1970 hdb2 |
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karnesky
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Joined: 18 Mar 2004
Posts: 218
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| Posted: Wed Jun 29, 2005 1:32 am Post subject: |
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If you're not auto-mounting it, why are you mounting it as root? Mount it as a regular user.
If you do mount it as root, chmod and/or chown the mount point (don't use the recursive switch though).
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wuzzerd
Guru
Joined: 05 Jan 2005
Posts: 467
Location: New Mexico
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| Posted: Wed Jun 29, 2005 1:41 am Post subject: |
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| DAharon wrote: | | Well, I have read the man page for mount, and I have played with this a lot, but I just can't seem to get it to work. |
Look carefully at what grajagan wrote:
| Quote: | = "grajagan"
/etc/fstab:
/dev/hda1 /mnt/hda1 auto noatime,user,uid=1000 0 0
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For ntfs and some others a user can only access the mount point if his uid is in the fstab. The uid is assigned for you and is in /etc/passwd. Changing the permissions before mounting has no effect, mount will change em. (see the man page).
I ran around in circles today doing this on a laptop on which I installed Ubuntu, until I read the man page. 
Hope this helps. |
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jmbsvicetto
Moderator
Joined: 27 Apr 2005
Posts: 4734
Location: Angra do Heroísmo (PT)
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| Posted: Wed Jun 29, 2005 1:55 am Post subject: |
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Hi.
The user parameter in /etc/fstab tells the system that you want your users to be able to mount and unmount the partition. The users parameter tells the system that you will allow other user than the one that mounted the partition to unmount it. Those parameters tell nothing regarding security to the system.
From my /etc/fstab
| Code: | atlantis@atl64 ~ $ cat /etc/fstab
...
/dev/sda2 /home/c ntfs noauto,noatime,users,uid=atlantis 0 0
/dev/sdb3 /home/d ntfs noauto,noatime,users,uid=atlantis 0 0 |
and assuming that the fat32 system allows the same option as ntfs, you'll have to use the uid parameter for the /dev/hdb2.
The ext2 filesystem security is set in the usual Linux way - file permissions. You'll have to check the uid/gid used in the system. I would only change that if you don't plan to start RedHat ever again.
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Jorge.
Your twisted, but hopefully friendly daemon.
AMD64 / x86 / Sparc Gentoo
Help answer || emwrap.sh
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Deathwing00
Bodhisattva
Joined: 13 Jun 2003
Posts: 4087
Location: Dresden, Germany
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| Posted: Wed Jun 29, 2005 6:19 am Post subject: |
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Moved from Installing Gentoo to Other Things Gentoo.
Instead of assigning a UID in the options, which will limit the access to only _one_ user, add the option umask=0 (umask=0x0 for ntfs partitions works too, but not for fat), that will give write access to all users.
| Code: |
/dev/hda1 /mnt/hda1 auto noatime,users,umask=0 0 0
/dev/hdb2 /mnt/hdb2 vfat defaults,umask=0 0 0
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