[PATCH] LSM: remove BSD secure level security module
Chris Wright [Fri, 29 Sep 2006 08:59:49 +0000 (01:59 -0700)]
This code has suffered from broken core design and lack of developer
attention.  Broken security modules are too dangerous to leave around.  It
is time to remove this one.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Davi Arnaut <davi.arnaut@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Documentation/seclvl.txt [deleted file]
security/Kconfig
security/Makefile
security/seclvl.c [deleted file]

diff --git a/Documentation/seclvl.txt b/Documentation/seclvl.txt
deleted file mode 100644 (file)
index 97274d1..0000000
+++ /dev/null
@@ -1,97 +0,0 @@
-BSD Secure Levels Linux Security Module
-Michael A. Halcrow <mike@halcrow.us>
-
-
-Introduction
-
-Under the BSD Secure Levels security model, sets of policies are
-associated with levels. Levels range from -1 to 2, with -1 being the
-weakest and 2 being the strongest. These security policies are
-enforced at the kernel level, so not even the superuser is able to
-disable or circumvent them. This hardens the machine against attackers
-who gain root access to the system.
-
-
-Levels and Policies
-
-Level -1 (Permanently Insecure):
- - Cannot increase the secure level
-
-Level 0 (Insecure):
- - Cannot ptrace the init process
-
-Level 1 (Default):
- - /dev/mem and /dev/kmem are read-only
- - IMMUTABLE and APPEND extended attributes, if set, may not be unset
- - Cannot load or unload kernel modules
- - Cannot write directly to a mounted block device
- - Cannot perform raw I/O operations
- - Cannot perform network administrative tasks
- - Cannot setuid any file
-
-Level 2 (Secure):
- - Cannot decrement the system time
- - Cannot write to any block device, whether mounted or not
- - Cannot unmount any mounted filesystems
-
-
-Compilation
-
-To compile the BSD Secure Levels LSM, seclvl.ko, enable the
-SECURITY_SECLVL configuration option.  This is found under Security
-options -> BSD Secure Levels in the kernel configuration menu.
-
-
-Basic Usage
-
-Once the machine is in a running state, with all the necessary modules
-loaded and all the filesystems mounted, you can load the seclvl.ko
-module:
-
-# insmod seclvl.ko
-
-The module defaults to secure level 1, except when compiled directly
-into the kernel, in which case it defaults to secure level 0. To raise
-the secure level to 2, the administrator writes ``2'' to the
-seclvl/seclvl file under the sysfs mount point (assumed to be /sys in
-these examples):
-
-# echo -n "2" > /sys/seclvl/seclvl
-
-Alternatively, you can initialize the module at secure level 2 with
-the initlvl module parameter:
-
-# insmod seclvl.ko initlvl=2
-
-At this point, it is impossible to remove the module or reduce the
-secure level.  If the administrator wishes to have the option of doing
-so, he must provide a module parameter, sha1_passwd, that specifies
-the SHA1 hash of the password that can be used to reduce the secure
-level to 0.
-
-To generate this SHA1 hash, the administrator can use OpenSSL:
-
-# echo -n "boogabooga" | openssl sha1
-abeda4e0f33defa51741217592bf595efb8d289c
-
-In order to use password-instigated secure level reduction, the SHA1
-crypto module must be loaded or compiled into the kernel:
-
-# insmod sha1.ko
-
-The administrator can then insmod the seclvl module, including the
-SHA1 hash of the password:
-
-# insmod seclvl.ko
-         sha1_passwd=abeda4e0f33defa51741217592bf595efb8d289c
-
-To reduce the secure level, write the password to seclvl/passwd under
-your sysfs mount point:
-
-# echo -n "boogabooga" > /sys/seclvl/passwd
-
-The September 2004 edition of Sys Admin Magazine has an article about
-the BSD Secure Levels LSM.  I encourage you to refer to that article
-for a more in-depth treatment of this security module:
-
-http://www.samag.com/documents/s=9304/sam0409a/0409a.htm
index 67785df..460e5c9 100644 (file)
@@ -93,18 +93,6 @@ config SECURITY_ROOTPLUG
          
          If you are unsure how to answer this question, answer N.
 
-config SECURITY_SECLVL
-       tristate "BSD Secure Levels"
-       depends on SECURITY
-       select CRYPTO
-       select CRYPTO_SHA1
-       help
-         Implements BSD Secure Levels as an LSM.  See
-         <file:Documentation/seclvl.txt> for instructions on how to use this
-         module.
-
-         If you are unsure how to answer this question, answer N.
-
 source security/selinux/Kconfig
 
 endmenu
index 8cbbf2f..ef87df2 100644 (file)
@@ -16,4 +16,3 @@ obj-$(CONFIG_SECURITY)                        += security.o dummy.o inode.o
 obj-$(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
diff --git a/security/seclvl.c b/security/seclvl.c
deleted file mode 100644 (file)
index 8f62919..0000000
+++ /dev/null
@@ -1,671 +0,0 @@
-/**
- * BSD Secure Levels LSM
- *
- * Maintainers:
- *     Michael A. Halcrow <mike@halcrow.us>
- *     Serge Hallyn <hallyn@cs.wm.edu>
- *
- * Copyright (c) 2001 WireX Communications, Inc <chris@wirex.com>
- * Copyright (c) 2001 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (c) 2002 International Business Machines <robb@austin.ibm.com>
- * Copyright (c) 2006 Davi E. M. Arnaut <davi.arnaut@gmail.com>
- *
- *     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; either version 2 of the License, or
- *     (at your option) any later version.
- */
-
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/security.h>
-#include <linux/netlink.h>
-#include <linux/fs.h>
-#include <linux/namei.h>
-#include <linux/mount.h>
-#include <linux/capability.h>
-#include <linux/time.h>
-#include <linux/proc_fs.h>
-#include <linux/kobject.h>
-#include <linux/crypto.h>
-#include <asm/scatterlist.h>
-#include <linux/scatterlist.h>
-#include <linux/gfp.h>
-#include <linux/sysfs.h>
-
-#define SHA1_DIGEST_SIZE 20
-
-/**
- * Module parameter that defines the initial secure level.
- *
- * When built as a module, it defaults to seclvl 1, which is the
- * behavior of BSD secure levels.  Note that this default behavior
- * wrecks havoc on a machine when the seclvl module is compiled into
- * the kernel. In that case, we default to seclvl 0.
- */
-#ifdef CONFIG_SECURITY_SECLVL_MODULE
-static int initlvl = 1;
-#else
-static int initlvl;
-#endif
-module_param(initlvl, int, 0);
-MODULE_PARM_DESC(initlvl, "Initial secure level (defaults to 1)");
-
-/* Module parameter that defines the verbosity level */
-static int verbosity;
-module_param(verbosity, int, 0);
-MODULE_PARM_DESC(verbosity, "Initial verbosity level (0 or 1; defaults to "
-                "0, which is Quiet)");
-
-/**
- * Optional password which can be passed in to bring seclvl to 0
- * (i.e., for halt/reboot).  Defaults to NULL (the passwd attribute
- * file will not be registered in sysfs).
- *
- * This gets converted to its SHA1 hash when stored.  It's probably
- * not a good idea to use this parameter when loading seclvl from a
- * script; use sha1_passwd instead.
- */
-
-#define MAX_PASSWD_SIZE        32
-static char passwd[MAX_PASSWD_SIZE];
-module_param_string(passwd, passwd, sizeof(passwd), 0);
-MODULE_PARM_DESC(passwd,
-                "Plaintext of password that sets seclvl=0 when written to "
-                "(sysfs mount point)/seclvl/passwd\n");
-
-/**
- * SHA1 hashed version of the optional password which can be passed in
- * to bring seclvl to 0 (i.e., for halt/reboot).  Must be in
- * hexadecimal format (40 characters). Defaults to NULL (the passwd
- * attribute file will not be registered in sysfs).
- *
- * Use the sha1sum utility to generate the SHA1 hash of a password:
- *
- * echo -n "secret" | sha1sum
- */
-#define MAX_SHA1_PASSWD        41
-static char sha1_passwd[MAX_SHA1_PASSWD];
-module_param_string(sha1_passwd, sha1_passwd, sizeof(sha1_passwd), 0);
-MODULE_PARM_DESC(sha1_passwd,
-                "SHA1 hash (40 hexadecimal characters) of password that "
-                "sets seclvl=0 when plaintext password is written to "
-                "(sysfs mount point)/seclvl/passwd\n");
-
-static int hideHash = 1;
-module_param(hideHash, int, 0);
-MODULE_PARM_DESC(hideHash, "When set to 0, reading seclvl/passwd from sysfs "
-                "will return the SHA1-hashed value of the password that "
-                "lowers the secure level to 0.\n");
-
-#define MY_NAME "seclvl"
-
-/**
- * This time-limits log writes to one per second.
- */
-#define seclvl_printk(verb, type, fmt, arg...)                 \
-       do {                                                    \
-               if (verbosity >= verb) {                        \
-                       static unsigned long _prior;            \
-                       unsigned long _now = jiffies;           \
-                       if ((_now - _prior) > HZ) {             \
-                               printk(type "%s: %s: " fmt,     \
-                                       MY_NAME, __FUNCTION__ , \
-                                       ## arg);                \
-                               _prior = _now;                  \
-                       }                                       \
-               }                                               \
-       } while (0)
-
-/**
- * The actual security level.  Ranges between -1 and 2 inclusive.
- */
-static int seclvl;
-
-/**
- * flag to keep track of how we were registered
- */
-static int secondary;
-
-/**
- * Verifies that the requested secure level is valid, given the current
- * secure level.
- */
-static int seclvl_sanity(int reqlvl)
-{
-       if ((reqlvl < -1) || (reqlvl > 2)) {
-               seclvl_printk(1, KERN_WARNING, "Attempt to set seclvl out of "
-                             "range: [%d]\n", reqlvl);
-               return -EINVAL;
-       }
-       if ((seclvl == 0) && (reqlvl == -1))
-               return 0;
-       if (reqlvl < seclvl) {
-               seclvl_printk(1, KERN_WARNING, "Attempt to lower seclvl to "
-                             "[%d]\n", reqlvl);
-               return -EPERM;
-       }
-       return 0;
-}
-
-/**
- * security level advancement rules:
- *   Valid levels are -1 through 2, inclusive.
- *   From -1, stuck.  [ in case compiled into kernel ]
- *   From 0 or above, can only increment.
- */
-static void do_seclvl_advance(void *data, u64 val)
-{
-       int ret;
-       int newlvl = (int)val;
-
-       ret = seclvl_sanity(newlvl);
-       if (ret)
-               return;
-
-       if (newlvl > 2) {
-               seclvl_printk(1, KERN_WARNING, "Cannot advance to seclvl "
-                             "[%d]\n", newlvl);
-               return;
-       }
-       if (seclvl == -1) {
-               seclvl_printk(1, KERN_WARNING, "Not allowed to advance to "
-                             "seclvl [%d]\n", seclvl);
-               return;
-       }
-       seclvl = newlvl;  /* would it be more "correct" to set *data? */
-       return;
-}
-
-static u64 seclvl_int_get(void *data)
-{
-       return *(int *)data;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(seclvl_file_ops, seclvl_int_get, do_seclvl_advance, "%lld\n");
-
-static unsigned char hashedPassword[SHA1_DIGEST_SIZE];
-
-/**
- * Converts a block of plaintext of into its SHA1 hashed value.
- *
- * It would be nice if crypto had a wrapper to do this for us linear
- * people...
- */
-static int
-plaintext_to_sha1(unsigned char *hash, const char *plaintext, unsigned int len)
-{
-       struct hash_desc desc;
-       struct scatterlist sg;
-       int err;
-
-       if (len > PAGE_SIZE) {
-               seclvl_printk(0, KERN_ERR, "Plaintext password too large (%d "
-                             "characters).  Largest possible is %lu "
-                             "bytes.\n", len, PAGE_SIZE);
-               return -EINVAL;
-       }
-       desc.tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
-       if (IS_ERR(desc.tfm)) {
-               seclvl_printk(0, KERN_ERR,
-                             "Failed to load transform for SHA1\n");
-               return -EINVAL;
-       }
-       sg_init_one(&sg, (u8 *)plaintext, len);
-       desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
-       err = crypto_hash_digest(&desc, &sg, len, hash);
-       crypto_free_hash(desc.tfm);
-       return err;
-}
-
-/**
- * Called whenever the user writes to the sysfs passwd handle to this kernel
- * object.  It hashes the password and compares the hashed results.
- */
-static ssize_t
-passwd_write_file(struct file * file, const char __user * buf,
-                               size_t count, loff_t *ppos)
-{
-       char *p;
-       int len;
-       unsigned char tmp[SHA1_DIGEST_SIZE];
-
-       if (!*passwd && !*sha1_passwd) {
-               seclvl_printk(0, KERN_ERR, "Attempt to password-unlock the "
-                             "seclvl module, but neither a plain text "
-                             "password nor a SHA1 hashed password was "
-                             "passed in as a module parameter!  This is a "
-                             "bug, since it should not be possible to be in "
-                             "this part of the module; please tell a "
-                             "maintainer about this event.\n");
-               return -EINVAL;
-       }
-
-       if (count >= PAGE_SIZE)
-               return -EINVAL;
-       if (*ppos != 0)
-               return -EINVAL;
-       p = kmalloc(count, GFP_KERNEL);
-       if (!p)
-               return -ENOMEM;
-       len = -EFAULT;
-       if (copy_from_user(p, buf, count))
-               goto out;
-       
-       len = count;
-       /* ``echo "secret" > seclvl/passwd'' includes a newline */
-       if (p[len - 1] == '\n')
-               len--;
-       /* Hash the password, then compare the hashed values */
-       if ((len = plaintext_to_sha1(tmp, p, len))) {
-               seclvl_printk(0, KERN_ERR, "Error hashing password: rc = "
-                             "[%d]\n", len);
-               goto out;
-       }
-
-       len = -EPERM;
-       if (memcmp(hashedPassword, tmp, SHA1_DIGEST_SIZE))
-               goto out;
-
-       seclvl_printk(0, KERN_INFO,
-                     "Password accepted; seclvl reduced to 0.\n");
-       seclvl = 0;
-       len = count;
-
-out:
-       kfree (p);
-       return len;
-}
-
-static struct file_operations passwd_file_ops = {
-       .write = passwd_write_file,
-};
-
-/**
- * Explicitely disallow ptrace'ing the init process.
- */
-static int seclvl_ptrace(struct task_struct *parent, struct task_struct *child)
-{
-       if (seclvl >= 0 && child->pid == 1) {
-               seclvl_printk(1, KERN_WARNING, "Attempt to ptrace "
-                             "the init process dissallowed in "
-                             "secure level %d\n", seclvl);
-               return -EPERM;
-       }
-       return 0;
-}
-
-/**
- * Capability checks for seclvl.  The majority of the policy
- * enforcement for seclvl takes place here.
- */
-static int seclvl_capable(struct task_struct *tsk, int cap)
-{
-       int rc = 0;
-
-       /* init can do anything it wants */
-       if (tsk->pid == 1)
-               return 0;
-
-       if (seclvl > 0) {
-               rc = -EPERM;
-
-               if (cap == CAP_LINUX_IMMUTABLE)
-                       seclvl_printk(1, KERN_WARNING, "Attempt to modify "
-                                     "the IMMUTABLE and/or APPEND extended "
-                                     "attribute on a file with the IMMUTABLE "
-                                     "and/or APPEND extended attribute set "
-                                     "denied in seclvl [%d]\n", seclvl);
-               else if (cap == CAP_SYS_RAWIO)
-                       seclvl_printk(1, KERN_WARNING, "Attempt to perform "
-                                     "raw I/O while in secure level [%d] "
-                                     "denied\n", seclvl);
-               else if (cap == CAP_NET_ADMIN)
-                       seclvl_printk(1, KERN_WARNING, "Attempt to perform "
-                                     "network administrative task while "
-                                     "in secure level [%d] denied\n", seclvl);
-               else if (cap == CAP_SETUID)
-                       seclvl_printk(1, KERN_WARNING, "Attempt to setuid "
-                                     "while in secure level [%d] denied\n",
-                                     seclvl);
-               else if (cap == CAP_SETGID)
-                       seclvl_printk(1, KERN_WARNING, "Attempt to setgid "
-                                     "while in secure level [%d] denied\n",
-                                     seclvl);
-               else if (cap == CAP_SYS_MODULE)
-                       seclvl_printk(1, KERN_WARNING, "Attempt to perform "
-                                     "a module operation while in secure "
-                                     "level [%d] denied\n", seclvl);
-               else
-                       rc = 0;
-       }
-
-       if (!rc) {
-               if (!(cap_is_fs_cap(cap) ? tsk->fsuid == 0 : tsk->euid == 0))
-                       rc = -EPERM;
-       }
-
-       if (rc)
-               seclvl_printk(1, KERN_WARNING, "Capability denied\n");
-
-       return rc;
-}
-
-/**
- * Disallow reversing the clock in seclvl > 1
- */
-static int seclvl_settime(struct timespec *tv, struct timezone *tz)
-{
-       if (tv && seclvl > 1) {
-               struct timespec now;
-               now = current_kernel_time();
-               if (tv->tv_sec < now.tv_sec ||
-                   (tv->tv_sec == now.tv_sec && tv->tv_nsec < now.tv_nsec)) {
-                       seclvl_printk(1, KERN_WARNING, "Attempt to decrement "
-                                     "time in secure level %d denied: "
-                                     "current->pid = [%d], "
-                                     "current->group_leader->pid = [%d]\n",
-                                     seclvl, current->pid,
-                                     current->group_leader->pid);
-                       return -EPERM;
-               }               /* if attempt to decrement time */
-       }                       /* if seclvl > 1 */
-       return 0;
-}
-
-/* claim the blockdev to exclude mounters, release on file close */
-static int seclvl_bd_claim(struct inode *inode)
-{
-       int holder;
-       struct block_device *bdev = NULL;
-       dev_t dev = inode->i_rdev;
-       bdev = open_by_devnum(dev, FMODE_WRITE);
-       if (bdev) {
-               if (bd_claim(bdev, &holder)) {
-                       blkdev_put(bdev);
-                       return -EPERM;
-               }
-               /* claimed, mark it to release on close */
-               inode->i_security = current;
-       }
-       return 0;
-}
-
-/* release the blockdev if you claimed it */
-static void seclvl_bd_release(struct inode *inode)
-{
-       if (inode && S_ISBLK(inode->i_mode) && inode->i_security == current) {
-               struct block_device *bdev = inode->i_bdev;
-               if (bdev) {
-                       bd_release(bdev);
-                       blkdev_put(bdev);
-                       inode->i_security = NULL;
-               }
-       }
-}
-
-/**
- * Security for writes to block devices is regulated by this seclvl
- * function.  Deny all writes to block devices in seclvl 2.  In
- * seclvl 1, we only deny writes to *mounted* block devices.
- */
-static int
-seclvl_inode_permission(struct inode *inode, int mask, struct nameidata *nd)
-{
-       if (current->pid != 1 && S_ISBLK(inode->i_mode) && (mask & MAY_WRITE)) {
-               switch (seclvl) {
-               case 2:
-                       seclvl_printk(1, KERN_WARNING, "Write to block device "
-                                     "denied in secure level [%d]\n", seclvl);
-                       return -EPERM;
-               case 1:
-                       if (seclvl_bd_claim(inode)) {
-                               seclvl_printk(1, KERN_WARNING,
-                                             "Write to mounted block device "
-                                             "denied in secure level [%d]\n",
-                                             seclvl);
-                               return -EPERM;
-                       }
-               }
-       }
-       return 0;
-}
-
-/**
- * The SUID and SGID bits cannot be set in seclvl >= 1
- */
-static int seclvl_inode_setattr(struct dentry *dentry, struct iattr *iattr)
-{
-       if (seclvl > 0) {
-               if (iattr->ia_valid & ATTR_MODE)
-                       if (iattr->ia_mode & S_ISUID ||
-                           iattr->ia_mode & S_ISGID) {
-                               seclvl_printk(1, KERN_WARNING, "Attempt to "
-                                             "modify SUID or SGID bit "
-                                             "denied in seclvl [%d]\n",
-                                             seclvl);
-                               return -EPERM;
-                       }
-       }
-       return 0;
-}
-
-/* release busied block devices */
-static void seclvl_file_free_security(struct file *filp)
-{
-       struct dentry *dentry = filp->f_dentry;
-
-       if (dentry)
-               seclvl_bd_release(dentry->d_inode);
-}
-
-/**
- * Cannot unmount in secure level 2
- */
-static int seclvl_umount(struct vfsmount *mnt, int flags)
-{
-       if (current->pid != 1 && seclvl == 2) {
-               seclvl_printk(1, KERN_WARNING, "Attempt to unmount in secure "
-                             "level %d\n", seclvl);
-               return -EPERM;
-       }
-       return 0;
-}
-
-static struct security_operations seclvl_ops = {
-       .ptrace = seclvl_ptrace,
-       .capable = seclvl_capable,
-       .inode_permission = seclvl_inode_permission,
-       .inode_setattr = seclvl_inode_setattr,
-       .file_free_security = seclvl_file_free_security,
-       .settime = seclvl_settime,
-       .sb_umount = seclvl_umount,
-};
-
-/**
- * Process the password-related module parameters
- */
-static int processPassword(void)
-{
-       int rc = 0;
-       if (*passwd) {
-               char *p;
-
-               if (*sha1_passwd) {
-                       seclvl_printk(0, KERN_ERR, "Error: Both "
-                                     "passwd and sha1_passwd "
-                                     "were set, but they are mutually "
-                                     "exclusive.\n");
-                       return -EINVAL;
-               }
-
-               p = kstrdup(passwd, GFP_KERNEL);
-               if (p == NULL)
-                       return -ENOMEM;
-
-               if ((rc = plaintext_to_sha1(hashedPassword, p, strlen(p))))
-                       seclvl_printk(0, KERN_ERR, "Error: SHA1 support not "
-                                     "in kernel\n");
-
-               kfree (p);
-               /* All static data goes to the BSS, which zero's the
-                * plaintext password out for us. */
-       } else if (*sha1_passwd) {      // Base 16
-               int i;
-               i = strlen(sha1_passwd);
-               if (i != (SHA1_DIGEST_SIZE * 2)) {
-                       seclvl_printk(0, KERN_ERR, "Received [%d] bytes; "
-                                     "expected [%d] for the hexadecimal "
-                                     "representation of the SHA1 hash of "
-                                     "the password.\n",
-                                     i, (SHA1_DIGEST_SIZE * 2));
-                       return -EINVAL;
-               }
-               while ((i -= 2) + 2) {
-                       unsigned char tmp;
-                       tmp = sha1_passwd[i + 2];
-                       sha1_passwd[i + 2] = '\0';
-                       hashedPassword[i / 2] = (unsigned char)
-                           simple_strtol(&sha1_passwd[i], NULL, 16);
-                       sha1_passwd[i + 2] = tmp;
-               }
-       }
-       return rc;
-}
-
-/**
- * securityfs registrations
- */
-struct dentry *dir_ino, *seclvl_ino, *passwd_ino;
-
-static int seclvlfs_register(void)
-{
-       int rc = 0;
-
-       dir_ino = securityfs_create_dir("seclvl", NULL);
-
-       if (IS_ERR(dir_ino))
-               return PTR_ERR(dir_ino);
-
-       seclvl_ino = securityfs_create_file("seclvl", S_IRUGO | S_IWUSR,
-                               dir_ino, &seclvl, &seclvl_file_ops);
-       if (IS_ERR(seclvl_ino)) {
-               rc = PTR_ERR(seclvl_ino);
-               goto out_deldir;
-       }
-       if (*passwd || *sha1_passwd) {
-               passwd_ino = securityfs_create_file("passwd", S_IRUGO | S_IWUSR,
-                               dir_ino, NULL, &passwd_file_ops);
-               if (IS_ERR(passwd_ino)) {
-                       rc = PTR_ERR(passwd_ino);
-                       goto out_delf;
-               }
-       }
-       return rc;
-
-out_delf:
-       securityfs_remove(seclvl_ino);
-
-out_deldir:
-       securityfs_remove(dir_ino);
-
-       return rc;
-}
-
-static void seclvlfs_unregister(void)
-{
-       securityfs_remove(seclvl_ino);
-
-       if (*passwd || *sha1_passwd)
-               securityfs_remove(passwd_ino);
-
-       securityfs_remove(dir_ino);
-}
-
-/**
- * Initialize the seclvl module.
- */
-static int __init seclvl_init(void)
-{
-       int rc = 0;
-       static char once;
-
-       if (verbosity < 0 || verbosity > 1) {
-               printk(KERN_ERR "Error: bad verbosity [%d]; only 0 or 1 "
-                      "are valid values\n", verbosity);
-               rc = -EINVAL;
-               goto exit;
-       }
-       if (initlvl < -1 || initlvl > 2) {
-               seclvl_printk(0, KERN_ERR, "Error: bad initial securelevel "
-                             "[%d].\n", initlvl);
-               rc = -EINVAL;
-               goto exit;
-       }
-       seclvl = initlvl;
-       if ((rc = processPassword())) {
-               seclvl_printk(0, KERN_ERR, "Error processing the password "
-                             "module parameter(s): rc = [%d]\n", rc);
-               goto exit;
-       }
-
-       if ((rc = seclvlfs_register())) {
-               seclvl_printk(0, KERN_ERR, "Error registering with sysfs\n");
-               goto exit;
-       }
-       /* register ourselves with the security framework */
-       if (register_security(&seclvl_ops)) {
-               seclvl_printk(0, KERN_ERR,
-                             "seclvl: Failure registering with the "
-                             "kernel.\n");
-               /* try registering with primary module */
-               rc = mod_reg_security(MY_NAME, &seclvl_ops);
-               if (rc) {
-                       seclvl_printk(0, KERN_ERR, "seclvl: Failure "
-                                     "registering with primary security "
-                                     "module.\n");
-                       seclvlfs_unregister();
-                       goto exit;
-               }               /* if primary module registered */
-               secondary = 1;
-       }                       /* if we registered ourselves with the security framework */
-
-       seclvl_printk(0, KERN_INFO, "seclvl: Successfully initialized.\n");
-
-       if (once) {
-               once = 1;
-               seclvl_printk(0, KERN_INFO, "seclvl is going away. It has been "
-                               "buggy for ages. Also, be warned that "
-                               "Securelevels are useless.");
-       }
- exit:
-       if (rc)
-               printk(KERN_ERR "seclvl: Error during initialization: rc = "
-                      "[%d]\n", rc);
-       return rc;
-}
-
-/**
- * Remove the seclvl module.
- */
-static void __exit seclvl_exit(void)
-{
-       seclvlfs_unregister();
-
-       if (secondary)
-               mod_unreg_security(MY_NAME, &seclvl_ops);
-       else if (unregister_security(&seclvl_ops))
-               seclvl_printk(0, KERN_INFO,
-                             "seclvl: Failure unregistering with the "
-                             "kernel\n");
-}
-
-module_init(seclvl_init);
-module_exit(seclvl_exit);
-
-MODULE_AUTHOR("Michael A. Halcrow <mike@halcrow.us>");
-MODULE_DESCRIPTION("LSM implementation of the BSD Secure Levels");
-MODULE_LICENSE("GPL");