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: [email protected]
[mailto:[email protected]] On Behalf Of Kyle O'Donnell
Sent: Thursday, March 24, 2011 11:11 AM
To: [email protected]
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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