[rhelv6-list] found a chmod bug in rhel 6.0

[Paul Krizak]

But this is a behavior change from RHEL5:

[root at svvadm01 tmp]# cat /etc/redhat-release
Red Hat Enterprise Linux Client release 5.4 (Tikanga)

[root at svvadm01 tmp]# mkdir foo
[root at svvadm01 tmp]# ls -lad foo
drwxr-xr-x 2 root root 4096 Mar 24 10:31 foo

[root at svvadm01 tmp]# chmod 2755 foo
[root at svvadm01 tmp]# ls -lad foo
drwxr-sr-x 2 root root 4096 Mar 24 10:31 foo

[root at svvadm01 tmp]# chmod 0755 foo
[root at svvadm01 tmp]# ls -lad foo
drwxr-xr-x 2 root root 4096 Mar 24 10:31 foo

And I don't know of a good reason for the behavior change.

Paul Krizak                         7171 Southwest Pkwy MS B200.3A
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On 03/24/2011 10:27 AM, Kinzel, David wrote:
> Man pages says as much:
>
>
>         chmod preserves a directory's set-user-ID and set-group-ID bits
> unless you explicitly specify  other-
>         wise.   You  can set or clear the bits with symbolic modes like
> u+s and g-s, and you can set (but not
>         clear) the bits with a numeric mode.
>
>
> 	From: rhelv6-list-bounces at redhat.com
> [mailto:rhelv6-list-bounces at redhat.com] On Behalf Of Kyle O'Donnell
> 	Sent: Thursday, March 24, 2011 11:11 AM
> 	To: rhelv6-list at redhat.com
> 	Subject: [rhelv6-list] found a chmod bug in rhel 6.0
> 	
> 	
> 	I think I found a bug with chmod, but I could just be
> misinformed...
> 	
> 	It looks like the numerical permission syntax for setuid/setgid
> can only be unset with the alphabetical syntax on directories.
> 	
> 	755 permission set on at directory
> 	# ls -lad at
> 	drwxr-xr-x 2 root root 4096 Mar 24 11:35 at
> 	
> 	add setgid
> 	# chmod 2755 at
> 	# ls -lad at
> 	drwxr-sr-x 2 root root 4096 Mar 24 11:35 at
> 	
> 	attempt to remove setgid
> 	# chmod 0755 at
> 	# ls -lad at
> 	drwxr-sr-x 2 root root 4096 Mar 24 11:35 at
> 	didnt work
> 	
> 	another attempt to remove setgid
> 	# chmod 755 at
> 	# ls -lad at
> 	drwxr-sr-x 2 root root 4096 Mar 24 11:35 at
> 	also didn't work
> 	
> 	and one more
> 	# chmod g-s at
> 	# ls -lad at
> 	drwxr-xr-x 2 root root 4096 Mar 24 11:35 at
> 	success
> 	
> 	This doesn't appear to affect files only directories.
> 	
> 	
> 	--kyleo
> 	
>
>
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