[nathanb@ka /x/sim/nathanb/nbsim1] ls -al ,nvram
-rw-r--r-- 1 root root 2097152 Jul 5 2011 ,nvram
[nathanb@ka /x/sim/nathanb/nbsim1] sudo chmod a+w ,nvram
chmod: changing permissions of `,nvram': Operation not permitted
The volume is mounted rw
, obviously, since I can modify other stuff. But even if I su
as root, I can't chmod
this file.
[root@ka /x/sim/nathanb/nbsim1] chmod +w ,nvram
chmod: changing permissions of `,nvram': Operation not permitted
I did an strace
on the chmod
, and I see this:
stat64(",nvram", {st_mode=S_IFREG|0644, st_size=2097152, ...}) = 0
chmod(",nvram", 0666) = -1 EPERM (Operation not permitted)
Here's the output of stat
[root@ka /x/sim/nathanb/nbsim1] stat ,nvram
Name: ,nvram Size: 2097152 Perms: 0644/-rw-r--r--
Type: Regular File Blocks: 4120 User: 0/root
Inode: 205777 IOsize: 32768 Group: 0/root
Access Time: Sat Jul 23 09:27:31 2011 Links: 1
Modify Time: Tue Jul 5 18:36:35 2011 FS device: 28
Change Time: Sat Jul 23 09:30:35 2011 Maj/Min: 0/0
And just to prove that there's not weird uid stuff going on:
[root@ka /x/sim/nathanb/nbsim1] id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),503(mailman),21(slocate),30(gopher),500(http),14(uucp),188(xelus),16(radadmin)
Any ideas?
Best Answer
You tagged this under /nfs.. If that file is on an NFS filesystem, you might need to export it on the server with
no_root_squash
to allow root on the clients to change the permissions on the file system.