Ubuntu
udisks2 package

udisksctl mount some partitions in read mode for the user.

Bug #2025961 reported by geole0 on 2023-07-05

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	udisks2 (Ubuntu)	New	Undecided	Unassigned

Bug Description

Good morning.
Under ubuntu 23.04, I created four different partitions (ext4, ntfs, ext3, exfat).
When I plug in the usb key, all four partitions are automatically mounted by the UDISKSCTL application which says it works for me. i am the user "a".

journalctl -b -g Quest
juin 19 19:21:53 a udisksd[1343]: Mounted /dev/sdd4 at /media/a/Question4 on behalf of uid 1000
juin 19 19:21:54 a udisksd[1343]: Mounted /dev/sdd3 at /media/a/Question3 on behalf of uid 1000
juin 19 19:21:54 a udisksd[1343]: Mounted /dev/sdd1 at /media/a/Question1 on behalf of uid 1000
juin 19 19:21:54 a udisksd[1343]: Mounted /dev/sdd2 at /media/a/Question2 on behalf of uid 1000

But I see that I am banned from writing for two of them.

ls -ls /media/a | grep Quest
4 drwxr-xr-x 3 root root 4096 juin 19 19:02 Question1
4 drwxrwxrwx 1 a a 4096 juin 19 19:20 Question2
4 drwxr-xr-x 3 root root 4096 juin 19 19:03 Question3
32 drwxr-xr-x 2 a a 32768 juin 19 19:21 Question4

I thought that this version will finally properly address the problem that has existed for too long.

I consider this to be a malfunction and not smart security.

I summarize the problem.
When an external disk contains an ext4 partition, the user is not allowed to write to this partition. He
must do a command 'sudo chown/chmod ........'
It is not normal. This situation has lasted long enough. Do what is necessary so that the write mount of a USB medium is transparent to the user. It will do a lot of people a lot of good.
Good day.

Revision history for this message

geole0 (geole0) wrote on 2023-07-05:

I think that anyone capable of using a computer has the right to write to a USB key regardless of its formatting.
You don't have to be a genius with superpowers!
enfants@p:/media/enfants$ ls -als
total 127
4 drwxr-x---+ 25 root root 4096 juil. 5 09:11 .
4 drwxr-xr-x 11 root root 4096 juil. 5 09:10 ..
16 drwxr-xr-x 1 root root 0 juil. 5 08:32 btrfs
4 drwxr-xr-x 2 enfants enfants 4096 juil. 5 09:11 exfat
4 drwxr-xr-x 3 root root 4096 juil. 5 08:32 ext2
4 drwxr-xr-x 3 root root 4096 juil. 5 08:32 ext3
4 drwxr-xr-x 3 root root 4096 juil. 5 08:32 ext4
4 drwxr-xr-x 2 root root 4096 juil. 5 08:32 f2fs
16 drwxr-xr-x 2 enfants enfants 16384 janv. 1 1970 FAT16
1 drwxr-xr-x 2 enfants enfants 512 janv. 1 1970 FAT32
1 drwxr-xr-x 4 enfants enfants 512 janv. 1 1970 FAT-DEUXUSB
0 drwxr-xr-x 1 enfants enfants 3 juil. 5 09:11 hfsplus
1 drwxr-xr-x 2 root root 4096 juil. 5 08:34 nilfs2
4 drwxrwxrwx 1 enfants enfants 4096 juil. 5 08:34 ntfs
0 drwxr-xr-x 4 root root 80 juil. 5 09:11 reiserfs
0 drwxr-xr-x 2 root root 6 juil. 5 08:35 xfs

enfants@p:/media/enfants$ cd ext4

enfants@p:/media/enfants/ext4$ sudo mkdir titi
enfants n'apparaît pas dans le fichier sudoers. Cet incident sera signalé.
enfants@p:/media/enfants/ext4$

Revision history for this message

Sebastien Bacher (seb128) wrote on 2023-07-05:

Thank you for your bug report. I'm pretty sure I've read that description before, did you also post about that issue and where?
Also could you report the problem directly to upstream on https://github.com/storaged-project/udisks/issues ?