[PATCH] fix permissions on the `tainted' sysctl

From: Arjan van de Ven <arjanv@redhat.com>

The patch below sets the tainted sysctl file to read only, otherwise
userspace can just overwrite/reset it.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/sysctl.c

@@ -300,7 +300,7 @@ static ctl_table kern_table[] = {
 		.procname	= "tainted",
 		.data		= &tainted,
 		.maxlen		= sizeof(int),
-		.mode		= 0644,
+		.mode		= 0444,
 		.proc_handler	= &proc_dointvec,
 	},
 	{