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Date: Thu, 19 May 2011 15:57:02 +0400
From: samsonov@krista.ru
To: linux-kernel@vger.kernel.org
Subject: fs/attr.c patch
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--- ./linux-2.6.33.4.orig/fs/attr.c	2010-05-13 02:04:27.000000000 +0400
+++ ./linux-2.6.33.4/fs/attr.c	2011-05-19 15:43:14.533672804 +0400
@@ -35,9 +35,7 @@
 
 	/* Make sure caller can chgrp. */
 	if ((ia_valid & ATTR_GID) &&
-	    (current_fsuid() != inode->i_uid ||
-	    (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
-	    !capable(CAP_CHOWN))
+	    !(in_group_p(attr->ia_gid) && is_owner_or_cap(inode)))
 		goto error;
 
 	/* Make sure a caller can chmod. */

I think that fileowner can change group of file.