security: remove root_plug

    Remove the root_plug example LSM code.  It's unmaintained and
    increasingly broken in various ways.

    Made at the 2009 Kernel Summit in Tokyo!

    Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
    Signed-off-by: James Morris <jmorris@namei.org>

5 files changed, 1 insertions, 115 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6fa7292947e5..5d386b4ff6a0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -85,7 +85,6 @@ parameter is applicable:
         PPT     Parallel port support is enabled.
         PS2     Appropriate PS/2 support is enabled.
         RAM     RAM disk support is enabled.
-        ROOTPLUG The example Root Plug LSM is enabled.
         S390    S390 architecture is enabled.
         SCSI    Appropriate SCSI support is enabled.
                         A lot of drivers has their options described inside of
@@ -2163,15 +2162,6 @@ and is between 256 and 4096 characters. It is defined in the file
                         Useful for devices that are detected asynchronously
                         (e.g. USB and MMC devices).
 
-        root_plug.vendor_id=
-                        [ROOTPLUG] Override the default vendor ID
-
-        root_plug.product_id=
-                        [ROOTPLUG] Override the default product ID
-
-        root_plug.debug=
-                        [ROOTPLUG] Enable debugging output
-
         rw              [KNL] Mount root device read-write on boot
 
         S               [KNL] Run init in single mode
diff --git a/security/Kconfig b/security/Kconfig
index fb363cd81cf6..aeea8c2bb59c 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -100,19 +100,6 @@ config SECURITY_FILE_CAPABILITIES
 
           If in doubt, answer N.
 
-config SECURITY_ROOTPLUG
-        bool "Root Plug Support"
-        depends on USB=y && 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 INTEL_TXT
         bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
         depends on HAVE_INTEL_TXT
diff --git a/security/Makefile b/security/Makefile
index 95ecc06392d7..bb44e350c618 100644
--- a/security/Makefile
+++ b/security/Makefile
@@ -18,7 +18,6 @@ obj-$(CONFIG_SECURITY_SELINUX)		+= selinux/built-in.o
 obj-$(CONFIG_SECURITY_SMACK)            += smack/built-in.o
 obj-$(CONFIG_AUDIT)                     += lsm_audit.o
 obj-$(CONFIG_SECURITY_TOMOYO)           += tomoyo/built-in.o
-obj-$(CONFIG_SECURITY_ROOTPLUG)         += root_plug.o
 obj-$(CONFIG_CGROUP_DEVICE)             += device_cgroup.o
 
 # Object integrity file lists
diff --git a/security/commoncap.c b/security/commoncap.c
index fe30751a6cd9..45b87af4ae5d 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -1,4 +1,4 @@
-/* Common capabilities, needed by capability.o and root_plug.o
+/* Common capabilities, needed by capability.o.
  *
  *      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
diff --git a/security/root_plug.c b/security/root_plug.c
deleted file mode 100644
index 2f7ffa67c4d2..000000000000
--- a/security/root_plug.c
+++ /dev/null
@@ -1,90 +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/kernel.h>
-#include <linux/init.h>
-#include <linux/security.h>
-#include <linux/usb.h>
-#include <linux/moduleparam.h>
-
-/* 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_param(product_id, uint, 0400);
-
-/* should we print out debug messages */
-static int debug = 0;
-
-module_param(debug, bool, 0600);
-
-#define MY_NAME "root_plug"
-
-#define root_dbg(fmt, arg...)                                   \
-        do {                                                    \
-                if (debug)                                      \
-                        printk(KERN_DEBUG "%s: %s: " fmt ,      \
-                                MY_NAME , __func__ ,    \
-                                ## 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->cred->euid, bprm->cred->egid);
-
-        if (bprm->cred->egid == 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 = {
-        .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");
-                        return -EINVAL;
-        }
-        printk (KERN_INFO "Root Plug module initialized, "
-                "vendor_id = %4.4x, product id = %4.4x\n", vendor_id, product_id);
-        return 0;
-}
-
-security_initcall (rootplug_init);