topic Re: /etc/mnttab: permission denied in Operating System - HP-UX

/etc/mnttab: permission denied

yuli_3 — Mon, 04 Jul 2005 03:10:03 GMT

dear,

When i run command "bdf" as user, i got an error:
$ bdf
bdf: Cannot open /etc/mnttab: Permission denied

but, if we issued this command as root, output for bdf comnad is run normally.

someone can help me, please !

$ uname -a
HP-UX hqhpux36 B.11.00 A 9000/800 1193404627 two-user license
$ ll /etc/mnttab
-rw-r--r-- 1 root root 753 Jun 29 16:11 /etc/mnttab
$ ll /usr/bin/bdf
-r-xr-xr-x 1 root bin 28672 Mar 21 2003 /usr/bin/bdf

Re: /etc/mnttab: permission denied

Vibhor Kumar Agarwal — Mon, 04 Jul 2005 03:12:41 GMT

Check whether you have read and execute permissions on the parent directories i.e. /etc/

Re: /etc/mnttab: permission denied

Mark Nieuwboer — Mon, 04 Jul 2005 03:16:29 GMT

Can you read the file /etc/mnttab it could be corrupt.

Re: /etc/mnttab: permission denied

yuli_3 — Mon, 04 Jul 2005 03:21:29 GMT

permission for /etc:
$ ll | grep etc
dr-xr-xr-x 25 bin bin 6144 Jul 4 10:14 etc

I can read /etc/mnttab file:
$ more /etc/mnttab
/dev/vg00/lvol3 / vxfs log 0 1 1120061449
/dev/vg00/lvol1 /stand hfs defaults 0 0 1120061450
/dev/vg00/lvol8 /var vxfs delaylog,nodatainlog 0 0 1120061467
/dev/vg00/lvol7 /usr vxfs delaylog,nodatainlog 0 0 1120061467
/dev/vg00/lvol6 /users/home vxfs delaylog,nodatainlog 0 0 1120061467
/dev/vg00/lvol5 /tmp vxfs delaylog,nodatainlog 0 0 1120061467
/dev/vg00/lvol07 /oracle vxfs delaylog,nodatainlog 0 0 1120061468
/dev/vg00/lvol4 /opt vxfs delaylog,nodatainlog 0 0 1120061468
/dev/vg00/appstemp /oasis/temp vxfs delaylog,nodatainlog 0 0 1120061468
/dev/vg00/lvaudit /auditlog vxfs delaylog,nodatainlog 0 0 1120061468
/dev/vg02/lvol1 /appstest vxfs delaylog,nodatainlog 0 0 1120061468
/dev/vg02/lvol2 /apps11.5.9 vxfs delaylog,nodatainlog 0 0 1120061468

Re: /etc/mnttab: permission denied

Victor Fridyev — Mon, 04 Jul 2005 03:22:45 GMT

Hi,

Could you please check whether latest file system patches are installed on your machine ?

Run chmod 4555 /usr/bin/bdf.

This will resolve the problem

Regards

Re: /etc/mnttab: permission denied

yuli_3 — Mon, 04 Jul 2005 03:39:33 GMT

victor,

when i changed to 4555 /usr/bin/bdf,
problem is resolved.
$ ls -ld /usr/bin/bdf
-r-sr-xr-x 1 root bin 28672 Mar 21 2003 /usr/bin/bdf

but why i must do it ??in another server, permission for /usr/bin/bdf, only 555.

Re: /etc/mnttab: permission denied

Vibhor Kumar Agarwal — Mon, 04 Jul 2005 03:57:53 GMT

Yes Yes,

I am also eagerly waiting to know what is this 4555

Re: /etc/mnttab: permission denied

Victor Fridyev — Mon, 04 Jul 2005 04:09:59 GMT

Yuli,

bdf can work without s-bit as well. Check whether /etc/mnttab with
fuser -u /etc/mnttab
Usually bdf itself locks the file. May be on one of the servers the file is locked by a mistake.

HTH

Re: /etc/mnttab: permission denied

yuli_3 — Mon, 04 Jul 2005 04:15:18 GMT

4555 mean that users that not owner of file can execute this file (/usr/bin/bdf), but in another servers, permission for /usr/bin/bdf only 555 and all users can execute this file without error.confuse...

Re: /etc/mnttab: permission denied

Devender Khatana — Mon, 04 Jul 2005 04:26:41 GMT

Hi,

4xxx means setting UID on the file. Which means that whoever is authorised to execute the file can excute this but this will be always executed as the user who is owner of the file so here root. This makes sense as the /etc/mnttab could have locked by some user.

HTH,
Devender

Re: /etc/mnttab: permission denied

Amit Agarwal_1 — Mon, 04 Jul 2005 04:36:04 GMT

Similar to 'passwd' the command 'bdf' is also a setuid program. When executed, it assumes the root priviledges to read /etc/mnttab file and provide the output. The ll output on your system shows that it is missing that setuid permission, hence this failure.

$ chmod 4555 /usr/bin/bdf

Once you execute chmod you can see that first 'x' in permission string gets changed to 's'. You must run the baove command as root.

Hope this helps.

-Amit

Re: /etc/mnttab: permission denied

yuli_3 — Mon, 04 Jul 2005 04:37:00 GMT

ok..thanks for you all,

now i am understand.

many thanks,

yuli