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

[Kinzel, David]

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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