[2.6 patch] remove the Root Plug Support sample module

[Adrian Bunk <bunk@stusta.de>]

No matter whether LSM will stay or not, there's no reason to include a 
sample module in the build (e.g. Debian kernels are currently shipping 
this module).

Signed-off-by: Adrian Bunk <bunk@stusta.de>

---

 security/Kconfig     |   13 ---
 security/Makefile    |    1 
 security/root_plug.c |  142 -------------------------------------------
 3 files changed, 156 deletions(-)

--- linux-2.6.17-rc1-mm3-full/security/Kconfig.old	2006-04-21 21:08:18.000000000 +0200
+++ linux-2.6.17-rc1-mm3-full/security/Kconfig	2006-04-21 21:09:03.000000000 +0200
@@ -74,19 +74,6 @@
 	  This enables the "default" Linux capabilities functionality.
 	  If you are unsure how to answer this question, answer Y.
 
-config SECURITY_ROOTPLUG
-	tristate "Root Plug Support"
-	depends on USB && SECURITY
-	help
-	  This is a sample LSM module that should only be used as such.
-	  It prevents any programs running with egid == 0 if a specific
-	  USB device is not present in the system.
-
-	  See <http://www.linuxjournal.com/article.php?sid=6279> for
-	  more information about this module.
-	  
-	  If you are unsure how to answer this question, answer N.
-
 config SECURITY_SECLVL
 	tristate "BSD Secure Levels"
 	depends on SECURITY
--- linux-2.6.17-rc1-mm3-full/security/Makefile.old	2006-04-21 21:09:13.000000000 +0200
+++ linux-2.6.17-rc1-mm3-full/security/Makefile	2006-04-21 21:09:24.000000000 +0200
@@ -15,5 +15,4 @@
 # Must precede capability.o in order to stack properly.
 obj-$(CONFIG_SECURITY_SELINUX)		+= selinux/built-in.o
 obj-$(CONFIG_SECURITY_CAPABILITIES)	+= commoncap.o capability.o
-obj-$(CONFIG_SECURITY_ROOTPLUG)		+= commoncap.o root_plug.o
 obj-$(CONFIG_SECURITY_SECLVL)		+= seclvl.o
--- linux-2.6.17-rc1-mm3-full/security/root_plug.c	2006-03-20 06:53:29.000000000 +0100
+++ /dev/null	2006-02-12 01:05:26.000000000 +0100
@@ -1,142 +0,0 @@
-/*
- * Root Plug sample LSM module
- *
- * Originally written for a Linux Journal.
- *
- * Copyright (C) 2002 Greg Kroah-Hartman <greg@kroah.com>
- *
- * Prevents any programs running with egid == 0 if a specific USB device
- * is not present in the system.  Yes, it can be gotten around, but is a
- * nice starting point for people to play with, and learn the LSM
- * interface.
- *
- * If you want to turn this into something with a semblance of security,
- * you need to hook the task_* functions also.
- *
- * See http://www.linuxjournal.com/article.php?sid=6279 for more information
- * about this code.
- *
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License as
- *	published by the Free Software Foundation, version 2 of the
- *	License.
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/security.h>
-#include <linux/usb.h>
-
-/* flag to keep track of how we were registered */
-static int secondary;
-
-/* default is a generic type of usb to serial converter */
-static int vendor_id = 0x0557;
-static int product_id = 0x2008;
-
-module_param(vendor_id, uint, 0400);
-MODULE_PARM_DESC(vendor_id, "USB Vendor ID of device to look for");
-
-module_param(product_id, uint, 0400);
-MODULE_PARM_DESC(product_id, "USB Product ID of device to look for");
-
-/* should we print out debug messages */
-static int debug = 0;
-
-module_param(debug, bool, 0600);
-MODULE_PARM_DESC(debug, "Debug enabled or not");
-
-#if defined(CONFIG_SECURITY_ROOTPLUG_MODULE)
-#define MY_NAME THIS_MODULE->name
-#else
-#define MY_NAME "root_plug"
-#endif
-
-#define root_dbg(fmt, arg...)					\
-	do {							\
-		if (debug)					\
-			printk(KERN_DEBUG "%s: %s: " fmt ,	\
-				MY_NAME , __FUNCTION__ , 	\
-				## arg);			\
-	} while (0)
-
-static int rootplug_bprm_check_security (struct linux_binprm *bprm)
-{
-	struct usb_device *dev;
-
-	root_dbg("file %s, e_uid = %d, e_gid = %d\n",
-		 bprm->filename, bprm->e_uid, bprm->e_gid);
-
-	if (bprm->e_gid == 0) {
-		dev = usb_find_device(vendor_id, product_id);
-		if (!dev) {
-			root_dbg("e_gid = 0, and device not found, "
-				 "task not allowed to run...\n");
-			return -EPERM;
-		}
-		usb_put_dev(dev);
-	}
-
-	return 0;
-}
-
-static struct security_operations rootplug_security_ops = {
-	/* Use the capability functions for some of the hooks */
-	.ptrace =			cap_ptrace,
-	.capget =			cap_capget,
-	.capset_check =			cap_capset_check,
-	.capset_set =			cap_capset_set,
-	.capable =			cap_capable,
-
-	.bprm_apply_creds =		cap_bprm_apply_creds,
-	.bprm_set_security =		cap_bprm_set_security,
-
-	.task_post_setuid =		cap_task_post_setuid,
-	.task_reparent_to_init =	cap_task_reparent_to_init,
-
-	.bprm_check_security =		rootplug_bprm_check_security,
-};
-
-static int __init rootplug_init (void)
-{
-	/* register ourselves with the security framework */
-	if (register_security (&rootplug_security_ops)) {
-		printk (KERN_INFO 
-			"Failure registering Root Plug module with the kernel\n");
-		/* try registering with primary module */
-		if (mod_reg_security (MY_NAME, &rootplug_security_ops)) {
-			printk (KERN_INFO "Failure registering Root Plug "
-				" module with primary security module.\n");
-			return -EINVAL;
-		}
-		secondary = 1;
-	}
-	printk (KERN_INFO "Root Plug module initialized, "
-		"vendor_id = %4.4x, product id = %4.4x\n", vendor_id, product_id);
-	return 0;
-}
-
-static void __exit rootplug_exit (void)
-{
-	/* remove ourselves from the security framework */
-	if (secondary) {
-		if (mod_unreg_security (MY_NAME, &rootplug_security_ops))
-			printk (KERN_INFO "Failure unregistering Root Plug "
-				" module with primary module.\n");
-	} else { 
-		if (unregister_security (&rootplug_security_ops)) {
-			printk (KERN_INFO "Failure unregistering Root Plug "
-				"module with the kernel\n");
-		}
-	}
-	printk (KERN_INFO "Root Plug module removed\n");
-}
-
-security_initcall (rootplug_init);
-module_exit (rootplug_exit);
-
-MODULE_DESCRIPTION("Root Plug sample LSM module, written for Linux Journal article");
-MODULE_LICENSE("GPL");
-