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-   -   really screwy permissions error involving chmod, chgrp, chown (https://www.linuxquestions.org/questions/linux-software-2/really-screwy-permissions-error-involving-chmod-chgrp-chown-630920/)

Ryzol 03-26-2008 11:18 PM
really screwy permissions error involving chmod, chgrp, chown
 
Okay so I was root, mounted a flash drive, and then accidentally copied a file to the flash drive so it inherited the root group's permissions. No big deal I thought, I'll just chmod and chown it to my normal log in. WRONG! Anyways here's the commands/their output I tried after copying that file as root and their output. I ran them as verbose when I could. All these commands were entered by root. The file in question is /media/usb/vimnotes

At the top are the permissions before I try to mess with them, displayed by ls -l. I think you can tell the other commands I ran, if not I'll clarify.

Any ideas what happened? I'm extremely perplexed that chmod 777 as root did not set the permissions correctly.

Code:
mount -w /dev/sda1 /media/usb/ #usb is a symbolic link to usb0
drwxr-xr-x 4 root root 4096 1969-12-31 14:00 /media/usb/
drwxr-xr-x 4 root root 4096 1969-12-31 14:00 /media/usb0/
drwxr-xr-x 2 root root 4096 2008-03-26 02:58 /media/usb1/
-rwxr-xr-x 1 root root 305 2008-03-26 15:35 /media/usb/vimnotes
chown: changing ownership of `/media/usb/vimnotes': Operation not permitted
failed to change ownership of `/media/usb/vimnotes' to jlang:users
mode of `/media/usb/vimnotes' changed to 0777 (rwxrwxrwx) #tried chmod 777 here, no luck
-rwxr-xr-x 1 root root 305 2008-03-26 15:35 /media/usb/vimnotes
failed to change group of `/media/usb/vimnotes' to users
/media/usb/vimnotes: ASCII English text

/etc/mtab
Code:
/dev/hda1 / ext3 rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
usbfs /proc/bus/usb usbfs rw 0 0
/dev/sda1 /media/usb0 vfat rw 0 0
/etc/fstab
Code:
/dev/hda1 / ext3 rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
usbfs /proc/bus/usb usbfs rw 0 0
/dev/sda1 /media/usb0 vfat rw 0 0
/dev/hda5        swap            swap        defaults        0  0
/dev/hda1        /                ext3        defaults        1  1
#/dev/cdrom      /mnt/cdrom      auto        noauto,owner,ro  0  0
/dev/fd0        /mnt/floppy      auto        noauto,owner    0  0
devpts          /dev/pts        devpts      gid=5,mode=620  0  0
proc            /proc            proc        defaults        0  0

gilead 03-26-2008 11:36 PM
Since the file system is vfat it doesn't support Linux file system attributes. You can mount it to belong to a particular user/group or with a umask that allows anyone to write to it. For example:
Code:
/dev/sda1  /mnt/usb  vfat  defaults,umask=0000
Have a look at the man page for mount and search for "mount options for vfat" for more info.


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