topic Re: GNU chown exits after Operation not permitted in Operating System - Linux

GNU chown exits after Operation not permitted

Ashok Kumar_6 — Thu, 01 Sep 2005 05:13:38 GMT

Why GNU (Linux AS 3.0) does not allow to change ownership of a file to owner of the user. How can we fix this.

Re: GNU chown exits after Operation not permitted

Steven E. Protter — Thu, 01 Sep 2005 05:58:06 GMT

There may be a bug. Are you current on fixes and up2date or yum?

pwck
grpck

If those commands exist there may be a problem in the /etc/passwd or /etc/shadow or /etc/group file.

There may be a better message in /var/log/messages or dmesg output.

SEP

Re: GNU chown exits after Operation not permitted

Ashok Kumar_6 — Thu, 01 Sep 2005 06:05:57 GMT

/var/log/messages or dmesg output does not telling me anything regarding this.
==
[root@whdb3 root]# uname -a
Linux whdb3.americas.corp.timex.com 2.4.21-27.0.4.ELsmp #1 SMP Sat Apr 16 18:43:06 EDT 2005 i686 i686 i386 GNU/Linux
[root@whdb3 root]# pwck
user adm: directory /var/adm does not exist
user news: directory /etc/news does not exist
user uucp: directory /var/spool/uucp does not exist
user gopher: directory /var/gopher does not exist
user ident: directory /home/ident does not exist
user pcap: directory /var/arpwatch does not exist
pwck: no changes
[root@whdb3 root]# grpck
[root@whdb3 root]#

Re: GNU chown exits after Operation not permitted

Gopi Sekar — Thu, 01 Sep 2005 06:21:10 GMT

which file you are trying to change? is it single file or group of files?

I believe you are trying this as root user, otherwise that is the problem, you have to run chown as root.

Are you running this from some sort of restricted shell?

Hope this helps,
Gopi

Re: GNU chown exits after Operation not permitted

Ashok Kumar_6 — Thu, 01 Sep 2005 06:31:42 GMT

[akumar@whdb3 tmp]$ ll dfd
-rwxr-xr-x 1 akumar it 8 Sep 1 05:31 dfd
[akumar@whdb3 tmp]$ chown appldwp.dba dfd
chown: changing ownership of `dfd': Operation not permitted
[akumar@whdb3 tmp]$ id
uid=504(akumar) gid=501(it) groups=501(it),0(root)
[akumar@whdb3 tmp]$
========
The above will answer your most of the questions. root is able to run chown, but no one else. even when akumar is a member of root group.

Re: GNU chown exits after Operation not permitted

Gopi Sekar — Thu, 01 Sep 2005 06:42:46 GMT

the problem is simple, you need to run the chown as root user only.

changing of any file attributes is allowed only if the file is owned by the user or group (with write permission) or others(write permission is required). otherwise only root is allowed to modify.

Hope this helps,
Gopi

Re: GNU chown exits after Operation not permitted

Ashok Kumar_6 — Thu, 01 Sep 2005 08:23:26 GMT

Gopi, u didnot read my message completly. the owner of the file is akumar(see ll output) and the current user is akumar only(see id output). I'm not that stupid as u think

Re: GNU chown exits after Operation not permitted

Ivan Ferreira — Thu, 01 Sep 2005 08:59:05 GMT

That is a normal behaviour. You cannot use the chown command with any other user besides root.

If you want to share a file, you have two choises:

Create a directory with the right group membership, and set the SGID bit to the directory. Instruct users to create "shared" files there. Make users needing the files members of the same group.

Use SUDO to allow the use of chown command to users on they home directory only.

Re: GNU chown exits after Operation not permitted

Gopi Sekar — Thu, 01 Sep 2005 10:01:11 GMT

I know you are not that stupid but still, you can not change ownership files owned by you to some other user id eventhough they are yours.

Hope I am clear to you this time,
Gopi

Re: GNU chown exits after Operation not permitted

Ashok Kumar_6 — Thu, 01 Sep 2005 10:04:44 GMT

This works on HP-UX, why not in Linux?

Re: GNU chown exits after Operation not permitted

Ivan Ferreira — Thu, 01 Sep 2005 10:29:33 GMT

Because with a well planned directory structure and group membership, is not needed.

You should read the User Private Group security scheme used by Linux.

Re: GNU chown exits after Operation not permitted

Ashok Kumar_6 — Fri, 02 Sep 2005 00:31:51 GMT

So this is how it will work now. If u can not beat them join them ;). Changed my stretegy according to new constraints.

Thanks to all.