/*
   * Linux Security plug
   *
   * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
   * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
   * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
   * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
   * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
   *
   *	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.
   *
   *	Due to this file being licensed under the GPL there is controversy over
   *	whether this permits you to write a module that #includes this file
   *	without placing your module under the GPL.  Please consult a lawyer for
   *	advice before doing this.
   *
   */
  
  #ifndef __LINUX_SECURITY_H
  #define __LINUX_SECURITY_H
  
  #include <linux/fs.h>

  #include <linux/fsnotify.h>

  #include <linux/binfmts.h>

  #include <linux/dcache.h>

  #include <linux/signal.h>
  #include <linux/resource.h>
  #include <linux/sem.h>
  #include <linux/shm.h>

  #include <linux/mm.h> /* PAGE_ALIGN */

  #include <linux/msg.h>
  #include <linux/sched.h>

  #include <linux/key.h>

  #include <linux/xfrm.h>

  #include <linux/slab.h>

  #include <linux/xattr.h>

  #include <net/flow.h>

  /* Maximum number of letters for an LSM name string */
  #define SECURITY_NAME_MAX	10

  /* If capable should audit the security request */
  #define SECURITY_CAP_NOAUDIT 0
  #define SECURITY_CAP_AUDIT 1

  struct ctl_table;

  struct audit_krule;

  struct user_namespace;

  
  /*
   * These functions are in security/capability.c and are used
   * as the default capabilities functions
   */

  extern int cap_capable(struct task_struct *tsk, const struct cred *cred,

  		       struct user_namespace *ns, int cap, int audit);

  extern int cap_settime(const struct timespec *ts, const struct timezone *tz);

  extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode);

  extern int cap_ptrace_traceme(struct task_struct *parent);

  extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);

  extern int cap_capset(struct cred *new, const struct cred *old,
  		      const kernel_cap_t *effective,
  		      const kernel_cap_t *inheritable,
  		      const kernel_cap_t *permitted);

  extern int cap_bprm_set_creds(struct linux_binprm *bprm);

  extern int cap_bprm_secureexec(struct linux_binprm *bprm);

  extern int cap_inode_setxattr(struct dentry *dentry, const char *name,
  			      const void *value, size_t size, int flags);
  extern int cap_inode_removexattr(struct dentry *dentry, const char *name);

  extern int cap_inode_need_killpriv(struct dentry *dentry);
  extern int cap_inode_killpriv(struct dentry *dentry);

  extern int cap_file_mmap(struct file *file, unsigned long reqprot,
  			 unsigned long prot, unsigned long flags,
  			 unsigned long addr, unsigned long addr_only);

  extern int cap_task_fix_setuid(struct cred *new, const struct cred *old, int flags);

  extern int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,

  			  unsigned long arg4, unsigned long arg5);

  extern int cap_task_setscheduler(struct task_struct *p);

  extern int cap_task_setioprio(struct task_struct *p, int ioprio);
  extern int cap_task_setnice(struct task_struct *p, int nice);

  extern int cap_vm_enough_memory(struct mm_struct *mm, long pages);

  
  struct msghdr;
  struct sk_buff;
  struct sock;
  struct sockaddr;
  struct socket;

  struct flowi;
  struct dst_entry;
  struct xfrm_selector;
  struct xfrm_policy;
  struct xfrm_state;
  struct xfrm_user_sec_ctx;

  struct seq_file;

  
  extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);

  extern int cap_netlink_recv(struct sk_buff *skb, int cap);

  void reset_security_ops(void);

  #ifdef CONFIG_MMU

  extern unsigned long mmap_min_addr;

  extern unsigned long dac_mmap_min_addr;

  #else
  #define dac_mmap_min_addr	0UL
  #endif

  /*
   * Values used in the task_security_ops calls
   */
  /* setuid or setgid, id0 == uid or gid */
  #define LSM_SETID_ID	1
  
  /* setreuid or setregid, id0 == real, id1 == eff */
  #define LSM_SETID_RE	2
  
  /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
  #define LSM_SETID_RES	4
  
  /* setfsuid or setfsgid, id0 == fsuid or fsgid */
  #define LSM_SETID_FS	8
  
  /* forward declares to avoid warnings */

  struct sched_param;

  struct request_sock;

  /* bprm->unsafe reasons */

  #define LSM_UNSAFE_SHARE	1
  #define LSM_UNSAFE_PTRACE	2
  #define LSM_UNSAFE_PTRACE_CAP	4

  #ifdef CONFIG_MMU

  /*
   * If a hint addr is less than mmap_min_addr change hint to be as
   * low as possible but still greater than mmap_min_addr
   */
  static inline unsigned long round_hint_to_min(unsigned long hint)
  {
  	hint &= PAGE_MASK;
  	if (((void *)hint != NULL) &&
  	    (hint < mmap_min_addr))
  		return PAGE_ALIGN(mmap_min_addr);
  	return hint;
  }

  extern int mmap_min_addr_handler(struct ctl_table *table, int write,

  				 void __user *buffer, size_t *lenp, loff_t *ppos);

  #endif

  /* security_inode_init_security callback function to write xattrs */
  typedef int (*initxattrs) (struct inode *inode,
  			   const struct xattr *xattr_array, void *fs_data);

  #ifdef CONFIG_SECURITY

  struct security_mnt_opts {
  	char **mnt_opts;
  	int *mnt_opts_flags;
  	int num_mnt_opts;
  };
  
  static inline void security_init_mnt_opts(struct security_mnt_opts *opts)
  {
  	opts->mnt_opts = NULL;
  	opts->mnt_opts_flags = NULL;
  	opts->num_mnt_opts = 0;
  }
  
  static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  {
  	int i;
  	if (opts->mnt_opts)

  		for (i = 0; i < opts->num_mnt_opts; i++)

  			kfree(opts->mnt_opts[i]);
  	kfree(opts->mnt_opts);
  	opts->mnt_opts = NULL;
  	kfree(opts->mnt_opts_flags);
  	opts->mnt_opts_flags = NULL;
  	opts->num_mnt_opts = 0;
  }

  /**
   * struct security_operations - main security structure
   *

   * Security module identifier.
   *
   * @name:
   *	A string that acts as a unique identifeir for the LSM with max number
   *	of characters = SECURITY_NAME_MAX.
   *

   * Security hooks for program execution operations.
   *

   * @bprm_set_creds:

   *	Save security information in the bprm->security field, typically based
   *	on information about the bprm->file, for later use by the apply_creds
   *	hook.  This hook may also optionally check permissions (e.g. for
   *	transitions between security domains).
   *	This hook may be called multiple times during a single execve, e.g. for
   *	interpreters.  The hook can tell whether it has already been called by
   *	checking to see if @bprm->security is non-NULL.  If so, then the hook
   *	may decide either to retain the security information saved earlier or
   *	to replace it.
   *	@bprm contains the linux_binprm structure.
   *	Return 0 if the hook is successful and permission is granted.
   * @bprm_check_security:

   *	This hook mediates the point when a search for a binary handler will
   *	begin.  It allows a check the @bprm->security value which is set in the
   *	preceding set_creds call.  The primary difference from set_creds is
   *	that the argv list and envp list are reliably available in @bprm.  This
   *	hook may be called multiple times during a single execve; and in each
   *	pass set_creds is called first.

   *	@bprm contains the linux_binprm structure.

   *	Return 0 if the hook is successful and permission is granted.

   * @bprm_committing_creds:
   *	Prepare to install the new security attributes of a process being
   *	transformed by an execve operation, based on the old credentials
   *	pointed to by @current->cred and the information set in @bprm->cred by
   *	the bprm_set_creds hook.  @bprm points to the linux_binprm structure.
   *	This hook is a good place to perform state changes on the process such
   *	as closing open file descriptors to which access will no longer be
   *	granted when the attributes are changed.  This is called immediately
   *	before commit_creds().
   * @bprm_committed_creds:
   *	Tidy up after the installation of the new security attributes of a
   *	process being transformed by an execve operation.  The new credentials
   *	have, by this point, been set to @current->cred.  @bprm points to the
   *	linux_binprm structure.  This hook is a good place to perform state
   *	changes on the process such as clearing out non-inheritable signal
   *	state.  This is called immediately after commit_creds().

   * @bprm_secureexec:

   *	Return a boolean value (0 or 1) indicating whether a "secure exec"
   *	is required.  The flag is passed in the auxiliary table
   *	on the initial stack to the ELF interpreter to indicate whether libc
   *	should enable secure mode.
   *	@bprm contains the linux_binprm structure.

   *
   * Security hooks for filesystem operations.
   *
   * @sb_alloc_security:
   *	Allocate and attach a security structure to the sb->s_security field.
   *	The s_security field is initialized to NULL when the structure is
   *	allocated.
   *	@sb contains the super_block structure to be modified.
   *	Return 0 if operation was successful.
   * @sb_free_security:
   *	Deallocate and clear the sb->s_security field.
   *	@sb contains the super_block structure to be modified.
   * @sb_statfs:

   *	Check permission before obtaining filesystem statistics for the @mnt
   *	mountpoint.
   *	@dentry is a handle on the superblock for the filesystem.

   *	Return 0 if permission is granted.

   * @sb_mount:
   *	Check permission before an object specified by @dev_name is mounted on
   *	the mount point named by @nd.  For an ordinary mount, @dev_name
   *	identifies a device if the file system type requires a device.  For a
   *	remount (@flags & MS_REMOUNT), @dev_name is irrelevant.  For a
   *	loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
   *	pathname of the object being mounted.
   *	@dev_name contains the name for object being mounted.

   *	@path contains the path for mount point object.

   *	@type contains the filesystem type.
   *	@flags contains the mount flags.
   *	@data contains the filesystem-specific data.
   *	Return 0 if permission is granted.
   * @sb_copy_data:
   *	Allow mount option data to be copied prior to parsing by the filesystem,
   *	so that the security module can extract security-specific mount
   *	options cleanly (a filesystem may modify the data e.g. with strsep()).
   *	This also allows the original mount data to be stripped of security-
   *	specific options to avoid having to make filesystems aware of them.
   *	@type the type of filesystem being mounted.
   *	@orig the original mount data copied from userspace.
   *	@copy copied data which will be passed to the security module.
   *	Returns 0 if the copy was successful.

   * @sb_remount:
   *	Extracts security system specifc mount options and verifys no changes
   *	are being made to those options.
   *	@sb superblock being remounted
   *	@data contains the filesystem-specific data.
   *	Return 0 if permission is granted.

   * @sb_umount:
   *	Check permission before the @mnt file system is unmounted.
   *	@mnt contains the mounted file system.
   *	@flags contains the unmount flags, e.g. MNT_FORCE.
   *	Return 0 if permission is granted.

   * @sb_pivotroot:
   *	Check permission before pivoting the root filesystem.

   *	@old_path contains the path for the new location of the current root (put_old).

   *	@new_path contains the path for the new root (new_root).

   *	Return 0 if permission is granted.

   * @sb_set_mnt_opts:
   *	Set the security relevant mount options used for a superblock
   *	@sb the superblock to set security mount options for

   *	@opts binary data structure containing all lsm mount data

   * @sb_clone_mnt_opts:
   *	Copy all security options from a given superblock to another
   *	@oldsb old superblock which contain information to clone
   *	@newsb new superblock which needs filled in

   * @sb_parse_opts_str:
   *	Parse a string of security data filling in the opts structure
   *	@options string containing all mount options known by the LSM
   *	@opts binary data structure usable by the LSM

   *
   * Security hooks for inode operations.
   *
   * @inode_alloc_security:
   *	Allocate and attach a security structure to @inode->i_security.  The
   *	i_security field is initialized to NULL when the inode structure is
   *	allocated.
   *	@inode contains the inode structure.
   *	Return 0 if operation was successful.
   * @inode_free_security:
   *	@inode contains the inode structure.
   *	Deallocate the inode security structure and set @inode->i_security to

   *	NULL.

   * @inode_init_security:

   *	Obtain the security attribute name suffix and value to set on a newly

   *	created inode and set up the incore security field for the new inode.
   *	This hook is called by the fs code as part of the inode creation
   *	transaction and provides for atomic labeling of the inode, unlike
   *	the post_create/mkdir/... hooks called by the VFS.  The hook function
   *	is expected to allocate the name and value via kmalloc, with the caller
   *	being responsible for calling kfree after using them.
   *	If the security module does not use security attributes or does
   *	not wish to put a security attribute on this particular inode,
   *	then it should return -EOPNOTSUPP to skip this processing.
   *	@inode contains the inode structure of the newly created inode.
   *	@dir contains the inode structure of the parent directory.

   *	@qstr contains the last path component of the new object

   *	@name will be set to the allocated name suffix (e.g. selinux).
   *	@value will be set to the allocated attribute value.
   *	@len will be set to the length of the value.
   *	Returns 0 if @name and @value have been successfully set,
   *		-EOPNOTSUPP if no security attribute is needed, or
   *		-ENOMEM on memory allocation failure.

   * @inode_create:
   *	Check permission to create a regular file.
   *	@dir contains inode structure of the parent of the new file.
   *	@dentry contains the dentry structure for the file to be created.
   *	@mode contains the file mode of the file to be created.
   *	Return 0 if permission is granted.

   * @inode_link:
   *	Check permission before creating a new hard link to a file.
   *	@old_dentry contains the dentry structure for an existing link to the file.
   *	@dir contains the inode structure of the parent directory of the new link.
   *	@new_dentry contains the dentry structure for the new link.
   *	Return 0 if permission is granted.

   * @path_link:
   *	Check permission before creating a new hard link to a file.
   *	@old_dentry contains the dentry structure for an existing link
   *	to the file.
   *	@new_dir contains the path structure of the parent directory of
   *	the new link.
   *	@new_dentry contains the dentry structure for the new link.
   *	Return 0 if permission is granted.

   * @inode_unlink:

   *	Check the permission to remove a hard link to a file.

   *	@dir contains the inode structure of parent directory of the file.
   *	@dentry contains the dentry structure for file to be unlinked.
   *	Return 0 if permission is granted.

   * @path_unlink:
   *	Check the permission to remove a hard link to a file.
   *	@dir contains the path structure of parent directory of the file.
   *	@dentry contains the dentry structure for file to be unlinked.
   *	Return 0 if permission is granted.

   * @inode_symlink:
   *	Check the permission to create a symbolic link to a file.
   *	@dir contains the inode structure of parent directory of the symbolic link.
   *	@dentry contains the dentry structure of the symbolic link.
   *	@old_name contains the pathname of file.
   *	Return 0 if permission is granted.

   * @path_symlink:
   *	Check the permission to create a symbolic link to a file.
   *	@dir contains the path structure of parent directory of
   *	the symbolic link.
   *	@dentry contains the dentry structure of the symbolic link.
   *	@old_name contains the pathname of file.
   *	Return 0 if permission is granted.

   * @inode_mkdir:
   *	Check permissions to create a new directory in the existing directory

   *	associated with inode strcture @dir.

   *	@dir containst the inode structure of parent of the directory to be created.
   *	@dentry contains the dentry structure of new directory.
   *	@mode contains the mode of new directory.
   *	Return 0 if permission is granted.

   * @path_mkdir:
   *	Check permissions to create a new directory in the existing directory
   *	associated with path strcture @path.
   *	@dir containst the path structure of parent of the directory
   *	to be created.
   *	@dentry contains the dentry structure of new directory.
   *	@mode contains the mode of new directory.
   *	Return 0 if permission is granted.

   * @inode_rmdir:
   *	Check the permission to remove a directory.
   *	@dir contains the inode structure of parent of the directory to be removed.
   *	@dentry contains the dentry structure of directory to be removed.
   *	Return 0 if permission is granted.

   * @path_rmdir:
   *	Check the permission to remove a directory.
   *	@dir contains the path structure of parent of the directory to be
   *	removed.
   *	@dentry contains the dentry structure of directory to be removed.
   *	Return 0 if permission is granted.

   * @inode_mknod:
   *	Check permissions when creating a special file (or a socket or a fifo
   *	file created via the mknod system call).  Note that if mknod operation
   *	is being done for a regular file, then the create hook will be called
   *	and not this hook.
   *	@dir contains the inode structure of parent of the new file.
   *	@dentry contains the dentry structure of the new file.
   *	@mode contains the mode of the new file.

   *	@dev contains the device number.

   *	Return 0 if permission is granted.

   * @path_mknod:
   *	Check permissions when creating a file. Note that this hook is called
   *	even if mknod operation is being done for a regular file.
   *	@dir contains the path structure of parent of the new file.
   *	@dentry contains the dentry structure of the new file.
   *	@mode contains the mode of the new file.
   *	@dev contains the undecoded device number. Use new_decode_dev() to get
   *	the decoded device number.
   *	Return 0 if permission is granted.

   * @inode_rename:
   *	Check for permission to rename a file or directory.
   *	@old_dir contains the inode structure for parent of the old link.
   *	@old_dentry contains the dentry structure of the old link.
   *	@new_dir contains the inode structure for parent of the new link.
   *	@new_dentry contains the dentry structure of the new link.
   *	Return 0 if permission is granted.

   * @path_rename:
   *	Check for permission to rename a file or directory.
   *	@old_dir contains the path structure for parent of the old link.
   *	@old_dentry contains the dentry structure of the old link.
   *	@new_dir contains the path structure for parent of the new link.
   *	@new_dentry contains the dentry structure of the new link.
   *	Return 0 if permission is granted.

   * @path_chmod:
   *	Check for permission to change DAC's permission of a file or directory.
   *	@dentry contains the dentry structure.
   *	@mnt contains the vfsmnt structure.
   *	@mode contains DAC's mode.
   *	Return 0 if permission is granted.
   * @path_chown:
   *	Check for permission to change owner/group of a file or directory.
   *	@path contains the path structure.
   *	@uid contains new owner's ID.
   *	@gid contains new group's ID.
   *	Return 0 if permission is granted.

   * @path_chroot:
   *	Check for permission to change root directory.
   *	@path contains the path structure.
   *	Return 0 if permission is granted.

   * @inode_readlink:
   *	Check the permission to read the symbolic link.
   *	@dentry contains the dentry structure for the file link.
   *	Return 0 if permission is granted.
   * @inode_follow_link:
   *	Check permission to follow a symbolic link when looking up a pathname.
   *	@dentry contains the dentry structure for the link.
   *	@nd contains the nameidata structure for the parent directory.
   *	Return 0 if permission is granted.
   * @inode_permission:
   *	Check permission before accessing an inode.  This hook is called by the
   *	existing Linux permission function, so a security module can use it to
   *	provide additional checking for existing Linux permission checks.
   *	Notice that this hook is called when a file is opened (as well as many
   *	other operations), whereas the file_security_ops permission hook is
   *	called when the actual read/write operations are performed.
   *	@inode contains the inode structure to check.
   *	@mask contains the permission mask.

   *	Return 0 if permission is granted.
   * @inode_setattr:
   *	Check permission before setting file attributes.  Note that the kernel
   *	call to notify_change is performed from several locations, whenever
   *	file attributes change (such as when a file is truncated, chown/chmod
   *	operations, transferring disk quotas, etc).
   *	@dentry contains the dentry structure for the file.
   *	@attr is the iattr structure containing the new file attributes.
   *	Return 0 if permission is granted.

   * @path_truncate:
   *	Check permission before truncating a file.
   *	@path contains the path structure for the file.

   *	Return 0 if permission is granted.

   * @inode_getattr:
   *	Check permission before obtaining file attributes.
   *	@mnt is the vfsmount where the dentry was looked up
   *	@dentry contains the dentry structure for the file.
   *	Return 0 if permission is granted.

   * @inode_setxattr:

   *	Check permission before setting the extended attributes
   *	@value identified by @name for @dentry.
   *	Return 0 if permission is granted.

   * @inode_post_setxattr:

   *	Update inode security field after successful setxattr operation.
   *	@value identified by @name for @dentry.

   * @inode_getxattr:

   *	Check permission before obtaining the extended attributes
   *	identified by @name for @dentry.
   *	Return 0 if permission is granted.

   * @inode_listxattr:

   *	Check permission before obtaining the list of extended attribute
   *	names for @dentry.
   *	Return 0 if permission is granted.

   * @inode_removexattr:

   *	Check permission before removing the extended attribute
   *	identified by @name for @dentry.
   *	Return 0 if permission is granted.

   * @inode_getsecurity:

   *	Retrieve a copy of the extended attribute representation of the
   *	security label associated with @name for @inode via @buffer.  Note that
   *	@name is the remainder of the attribute name after the security prefix
   *	has been removed. @alloc is used to specify of the call should return a
   *	value via the buffer or just the value length Return size of buffer on
   *	success.

   * @inode_setsecurity:
   *	Set the security label associated with @name for @inode from the
   *	extended attribute value @value.  @size indicates the size of the
   *	@value in bytes.  @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.

   *	Note that @name is the remainder of the attribute name after the

   *	security. prefix has been removed.
   *	Return 0 on success.
   * @inode_listsecurity:
   *	Copy the extended attribute names for the security labels
   *	associated with @inode into @buffer.  The maximum size of @buffer
   *	is specified by @buffer_size.  @buffer may be NULL to request
   *	the size of the buffer required.
   *	Returns number of bytes used/required on success.

   * @inode_need_killpriv:
   *	Called when an inode has been changed.
   *	@dentry is the dentry being changed.
   *	Return <0 on error to abort the inode change operation.
   *	Return 0 if inode_killpriv does not need to be called.
   *	Return >0 if inode_killpriv does need to be called.
   * @inode_killpriv:
   *	The setuid bit is being removed.  Remove similar security labels.
   *	Called with the dentry->d_inode->i_mutex held.
   *	@dentry is the dentry being changed.
   *	Return 0 on success.  If error is returned, then the operation
   *	causing setuid bit removal is failed.

   * @inode_getsecid:
   *	Get the secid associated with the node.
   *	@inode contains a pointer to the inode.
   *	@secid contains a pointer to the location where result will be saved.
   *	In case of failure, @secid will be set to zero.

   *
   * Security hooks for file operations
   *
   * @file_permission:
   *	Check file permissions before accessing an open file.  This hook is
   *	called by various operations that read or write files.  A security
   *	module can use this hook to perform additional checking on these
   *	operations, e.g.  to revalidate permissions on use to support privilege
   *	bracketing or policy changes.  Notice that this hook is used when the
   *	actual read/write operations are performed, whereas the
   *	inode_security_ops hook is called when a file is opened (as well as
   *	many other operations).
   *	Caveat:  Although this hook can be used to revalidate permissions for
   *	various system call operations that read or write files, it does not
   *	address the revalidation of permissions for memory-mapped files.
   *	Security modules must handle this separately if they need such
   *	revalidation.
   *	@file contains the file structure being accessed.
   *	@mask contains the requested permissions.
   *	Return 0 if permission is granted.
   * @file_alloc_security:
   *	Allocate and attach a security structure to the file->f_security field.
   *	The security field is initialized to NULL when the structure is first
   *	created.
   *	@file contains the file structure to secure.
   *	Return 0 if the hook is successful and permission is granted.
   * @file_free_security:
   *	Deallocate and free any security structures stored in file->f_security.
   *	@file contains the file structure being modified.
   * @file_ioctl:
   *	@file contains the file structure.
   *	@cmd contains the operation to perform.
   *	@arg contains the operational arguments.
   *	Check permission for an ioctl operation on @file.  Note that @arg can
   *	sometimes represents a user space pointer; in other cases, it may be a
   *	simple integer value.  When @arg represents a user space pointer, it
   *	should never be used by the security module.
   *	Return 0 if permission is granted.
   * @file_mmap :
   *	Check permissions for a mmap operation.  The @file may be NULL, e.g.
   *	if mapping anonymous memory.
   *	@file contains the file structure for file to map (may be NULL).
   *	@reqprot contains the protection requested by the application.
   *	@prot contains the protection that will be applied by the kernel.
   *	@flags contains the operational flags.
   *	Return 0 if permission is granted.
   * @file_mprotect:
   *	Check permissions before changing memory access permissions.
   *	@vma contains the memory region to modify.
   *	@reqprot contains the protection requested by the application.
   *	@prot contains the protection that will be applied by the kernel.
   *	Return 0 if permission is granted.
   * @file_lock:
   *	Check permission before performing file locking operations.
   *	Note: this hook mediates both flock and fcntl style locks.
   *	@file contains the file structure.
   *	@cmd contains the posix-translated lock operation to perform
   *	(e.g. F_RDLCK, F_WRLCK).
   *	Return 0 if permission is granted.
   * @file_fcntl:
   *	Check permission before allowing the file operation specified by @cmd
   *	from being performed on the file @file.  Note that @arg can sometimes
   *	represents a user space pointer; in other cases, it may be a simple
   *	integer value.  When @arg represents a user space pointer, it should
   *	never be used by the security module.
   *	@file contains the file structure.
   *	@cmd contains the operation to be performed.
   *	@arg contains the operational arguments.
   *	Return 0 if permission is granted.
   * @file_set_fowner:
   *	Save owner security information (typically from current->security) in
   *	file->f_security for later use by the send_sigiotask hook.
   *	@file contains the file structure to update.
   *	Return 0 on success.
   * @file_send_sigiotask:
   *	Check permission for the file owner @fown to send SIGIO or SIGURG to the
   *	process @tsk.  Note that this hook is sometimes called from interrupt.
   *	Note that the fown_struct, @fown, is never outside the context of a
   *	struct file, so the file structure (and associated security information)
   *	can always be obtained:

   *		container_of(fown, struct file, f_owner)

   *	@tsk contains the structure of task receiving signal.

   *	@fown contains the file owner information.
   *	@sig is the signal that will be sent.  When 0, kernel sends SIGIO.
   *	Return 0 if permission is granted.
   * @file_receive:
   *	This hook allows security modules to control the ability of a process
   *	to receive an open file descriptor via socket IPC.
   *	@file contains the file structure being received.
   *	Return 0 if permission is granted.
   *

   * Security hook for dentry
   *
   * @dentry_open
   *	Save open-time permission checking state for later use upon
   *	file_permission, and recheck access if anything has changed
   *	since inode_permission.
   *

   * Security hooks for task operations.
   *
   * @task_create:
   *	Check permission before creating a child process.  See the clone(2)
   *	manual page for definitions of the @clone_flags.
   *	@clone_flags contains the flags indicating what should be shared.
   *	Return 0 if permission is granted.

   * @cred_alloc_blank:
   *	@cred points to the credentials.
   *	@gfp indicates the atomicity of any memory allocations.
   *	Only allocate sufficient memory and attach to @cred such that
   *	cred_transfer() will not get ENOMEM.

   * @cred_free:
   *	@cred points to the credentials.
   *	Deallocate and clear the cred->security field in a set of credentials.

   * @cred_prepare:
   *	@new points to the new credentials.
   *	@old points to the original credentials.
   *	@gfp indicates the atomicity of any memory allocations.
   *	Prepare a new set of credentials by copying the data from the old set.

   * @cred_transfer:
   *	@new points to the new credentials.
   *	@old points to the original credentials.
   *	Transfer data from original creds to new creds

   * @kernel_act_as:
   *	Set the credentials for a kernel service to act as (subjective context).
   *	@new points to the credentials to be modified.
   *	@secid specifies the security ID to be set
   *	The current task must be the one that nominated @secid.
   *	Return 0 if successful.
   * @kernel_create_files_as:
   *	Set the file creation context in a set of credentials to be the same as
   *	the objective context of the specified inode.
   *	@new points to the credentials to be modified.
   *	@inode points to the inode to use as a reference.
   *	The current task must be the one that nominated @inode.
   *	Return 0 if successful.

   * @kernel_module_request:
   *	Ability to trigger the kernel to automatically upcall to userspace for
   *	userspace to load a kernel module with the given name.

   *	@kmod_name name of the module requested by the kernel

   *	Return 0 if successful.

   * @task_fix_setuid:

   *	Update the module's state after setting one or more of the user
   *	identity attributes of the current process.  The @flags parameter
   *	indicates which of the set*uid system calls invoked this hook.  If

   *	@new is the set of credentials that will be installed.  Modifications
   *	should be made to this rather than to @current->cred.
   *	@old is the set of credentials that are being replaces

   *	@flags contains one of the LSM_SETID_* values.
   *	Return 0 on success.

   * @task_setpgid:
   *	Check permission before setting the process group identifier of the
   *	process @p to @pgid.
   *	@p contains the task_struct for process being modified.
   *	@pgid contains the new pgid.
   *	Return 0 if permission is granted.
   * @task_getpgid:
   *	Check permission before getting the process group identifier of the
   *	process @p.
   *	@p contains the task_struct for the process.
   *	Return 0 if permission is granted.
   * @task_getsid:
   *	Check permission before getting the session identifier of the process
   *	@p.
   *	@p contains the task_struct for the process.
   *	Return 0 if permission is granted.

   * @task_getsecid:
   *	Retrieve the security identifier of the process @p.
   *	@p contains the task_struct for the process and place is into @secid.

   *	In case of failure, @secid will be set to zero.
   *

   * @task_setnice:
   *	Check permission before setting the nice value of @p to @nice.
   *	@p contains the task_struct of process.
   *	@nice contains the new nice value.
   *	Return 0 if permission is granted.

   * @task_setioprio
   *	Check permission before setting the ioprio value of @p to @ioprio.
   *	@p contains the task_struct of process.
   *	@ioprio contains the new ioprio value
   *	Return 0 if permission is granted.

   * @task_getioprio
   *	Check permission before getting the ioprio value of @p.
   *	@p contains the task_struct of process.
   *	Return 0 if permission is granted.

   * @task_setrlimit:
   *	Check permission before setting the resource limits of the current
   *	process for @resource to @new_rlim.  The old resource limit values can
   *	be examined by dereferencing (current->signal->rlim + resource).
   *	@resource contains the resource whose limit is being set.
   *	@new_rlim contains the new limits for @resource.
   *	Return 0 if permission is granted.
   * @task_setscheduler:
   *	Check permission before setting scheduling policy and/or parameters of
   *	process @p based on @policy and @lp.
   *	@p contains the task_struct for process.
   *	@policy contains the scheduling policy.
   *	@lp contains the scheduling parameters.
   *	Return 0 if permission is granted.
   * @task_getscheduler:
   *	Check permission before obtaining scheduling information for process
   *	@p.
   *	@p contains the task_struct for process.
   *	Return 0 if permission is granted.

   * @task_movememory
   *	Check permission before moving memory owned by process @p.
   *	@p contains the task_struct for process.
   *	Return 0 if permission is granted.

   * @task_kill:
   *	Check permission before sending signal @sig to @p.  @info can be NULL,
   *	the constant 1, or a pointer to a siginfo structure.  If @info is 1 or
   *	SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
   *	from the kernel and should typically be permitted.
   *	SIGIO signals are handled separately by the send_sigiotask hook in
   *	file_security_ops.
   *	@p contains the task_struct for process.
   *	@info contains the signal information.
   *	@sig contains the signal value.

   *	@secid contains the sid of the process where the signal originated

   *	Return 0 if permission is granted.
   * @task_wait:
   *	Check permission before allowing a process to reap a child process @p
   *	and collect its status information.
   *	@p contains the task_struct for process.
   *	Return 0 if permission is granted.
   * @task_prctl:
   *	Check permission before performing a process control operation on the
   *	current process.
   *	@option contains the operation.
   *	@arg2 contains a argument.
   *	@arg3 contains a argument.
   *	@arg4 contains a argument.
   *	@arg5 contains a argument.

   *	Return -ENOSYS if no-one wanted to handle this op, any other value to
   *	cause prctl() to return immediately with that value.

   * @task_to_inode:

   *	Set the security attributes for an inode based on an associated task's
   *	security attributes, e.g. for /proc/pid inodes.

   *	@p contains the task_struct for the task.
   *	@inode contains the inode structure for the inode.
   *
   * Security hooks for Netlink messaging.
   *
   * @netlink_send:
   *	Save security information for a netlink message so that permission
   *	checking can be performed when the message is processed.  The security
   *	information can be saved using the eff_cap field of the

   *	netlink_skb_parms structure.  Also may be used to provide fine

   *	grained control over message transmission.
   *	@sk associated sock of task sending the message.,
   *	@skb contains the sk_buff structure for the netlink message.
   *	Return 0 if the information was successfully saved and message
   *	is allowed to be transmitted.
   * @netlink_recv:
   *	Check permission before processing the received netlink message in
   *	@skb.
   *	@skb contains the sk_buff structure for the netlink message.

   *	@cap indicates the capability required

   *	Return 0 if permission is granted.
   *
   * Security hooks for Unix domain networking.
   *
   * @unix_stream_connect:
   *	Check permissions before establishing a Unix domain stream connection
   *	between @sock and @other.

   *	@sock contains the sock structure.
   *	@other contains the peer sock structure.
   *	@newsk contains the new sock structure.

   *	Return 0 if permission is granted.
   * @unix_may_send:
   *	Check permissions before connecting or sending datagrams from @sock to
   *	@other.
   *	@sock contains the socket structure.
   *	@sock contains the peer socket structure.
   *	Return 0 if permission is granted.
   *
   * The @unix_stream_connect and @unix_may_send hooks were necessary because
   * Linux provides an alternative to the conventional file name space for Unix
   * domain sockets.  Whereas binding and connecting to sockets in the file name
   * space is mediated by the typical file permissions (and caught by the mknod
   * and permission hooks in inode_security_ops), binding and connecting to
   * sockets in the abstract name space is completely unmediated.  Sufficient
   * control of Unix domain sockets in the abstract name space isn't possible
   * using only the socket layer hooks, since we need to know the actual target
   * socket, which is not looked up until we are inside the af_unix code.
   *
   * Security hooks for socket operations.
   *
   * @socket_create:
   *	Check permissions prior to creating a new socket.
   *	@family contains the requested protocol family.
   *	@type contains the requested communications type.
   *	@protocol contains the requested protocol.
   *	@kern set to 1 if a kernel socket.
   *	Return 0 if permission is granted.
   * @socket_post_create:
   *	This hook allows a module to update or allocate a per-socket security
   *	structure. Note that the security field was not added directly to the
   *	socket structure, but rather, the socket security information is stored
   *	in the associated inode.  Typically, the inode alloc_security hook will
   *	allocate and and attach security information to
   *	sock->inode->i_security.  This hook may be used to update the
   *	sock->inode->i_security field with additional information that wasn't
   *	available when the inode was allocated.
   *	@sock contains the newly created socket structure.
   *	@family contains the requested protocol family.
   *	@type contains the requested communications type.
   *	@protocol contains the requested protocol.
   *	@kern set to 1 if a kernel socket.
   * @socket_bind:
   *	Check permission before socket protocol layer bind operation is
   *	performed and the socket @sock is bound to the address specified in the
   *	@address parameter.
   *	@sock contains the socket structure.
   *	@address contains the address to bind to.
   *	@addrlen contains the length of address.

   *	Return 0 if permission is granted.

   * @socket_connect:
   *	Check permission before socket protocol layer connect operation
   *	attempts to connect socket @sock to a remote address, @address.
   *	@sock contains the socket structure.
   *	@address contains the address of remote endpoint.
   *	@addrlen contains the length of address.

   *	Return 0 if permission is granted.

   * @socket_listen:
   *	Check permission before socket protocol layer listen operation.
   *	@sock contains the socket structure.
   *	@backlog contains the maximum length for the pending connection queue.
   *	Return 0 if permission is granted.
   * @socket_accept:
   *	Check permission before accepting a new connection.  Note that the new
   *	socket, @newsock, has been created and some information copied to it,
   *	but the accept operation has not actually been performed.
   *	@sock contains the listening socket structure.
   *	@newsock contains the newly created server socket for connection.
   *	Return 0 if permission is granted.

   * @socket_sendmsg:
   *	Check permission before transmitting a message to another socket.
   *	@sock contains the socket structure.
   *	@msg contains the message to be transmitted.
   *	@size contains the size of message.
   *	Return 0 if permission is granted.
   * @socket_recvmsg:
   *	Check permission before receiving a message from a socket.
   *	@sock contains the socket structure.
   *	@msg contains the message structure.
   *	@size contains the size of message structure.
   *	@flags contains the operational flags.

   *	Return 0 if permission is granted.

   * @socket_getsockname:
   *	Check permission before the local address (name) of the socket object
   *	@sock is retrieved.
   *	@sock contains the socket structure.
   *	Return 0 if permission is granted.
   * @socket_getpeername:
   *	Check permission before the remote address (name) of a socket object
   *	@sock is retrieved.
   *	@sock contains the socket structure.
   *	Return 0 if permission is granted.
   * @socket_getsockopt:
   *	Check permissions before retrieving the options associated with socket
   *	@sock.
   *	@sock contains the socket structure.
   *	@level contains the protocol level to retrieve option from.
   *	@optname contains the name of option to retrieve.
   *	Return 0 if permission is granted.
   * @socket_setsockopt:
   *	Check permissions before setting the options associated with socket
   *	@sock.
   *	@sock contains the socket structure.
   *	@level contains the protocol level to set options for.
   *	@optname contains the name of the option to set.

   *	Return 0 if permission is granted.

   * @socket_shutdown:
   *	Checks permission before all or part of a connection on the socket
   *	@sock is shut down.
   *	@sock contains the socket structure.
   *	@how contains the flag indicating how future sends and receives are handled.
   *	Return 0 if permission is granted.
   * @socket_sock_rcv_skb:
   *	Check permissions on incoming network packets.  This hook is distinct
   *	from Netfilter's IP input hooks since it is the first time that the
   *	incoming sk_buff @skb has been associated with a particular socket, @sk.

   *	Must not sleep inside this hook because some callers hold spinlocks.

   *	@sk contains the sock (not socket) associated with the incoming sk_buff.
   *	@skb contains the incoming network data.

   * @socket_getpeersec_stream:

   *	This hook allows the security module to provide peer socket security

   *	state for unix or connected tcp sockets to userspace via getsockopt
   *	SO_GETPEERSEC.  For tcp sockets this can be meaningful if the
   *	socket is associated with an ipsec SA.

   *	@sock is the local socket.
   *	@optval userspace memory where the security state is to be copied.
   *	@optlen userspace int where the module should copy the actual length
   *	of the security state.
   *	@len as input is the maximum length to copy to userspace provided
   *	by the caller.
   *	Return 0 if all is well, otherwise, typical getsockopt return
   *	values.

   * @socket_getpeersec_dgram:

   *	This hook allows the security module to provide peer socket security
   *	state for udp sockets on a per-packet basis to userspace via
   *	getsockopt SO_GETPEERSEC.  The application must first have indicated
   *	the IP_PASSSEC option via getsockopt.  It can then retrieve the
   *	security state returned by this hook for a packet via the SCM_SECURITY
   *	ancillary message type.
   *	@skb is the skbuff for the packet being queried
   *	@secdata is a pointer to a buffer in which to copy the security data
   *	@seclen is the maximum length for @secdata
   *	Return 0 on success, error on failure.

   * @sk_alloc_security:

   *	Allocate and attach a security structure to the sk->sk_security field,
   *	which is used to copy security attributes between local stream sockets.

   * @sk_free_security:
   *	Deallocate security structure.

   * @sk_clone_security:
   *	Clone/copy security structure.

   * @sk_getsecid:
   *	Retrieve the LSM-specific secid for the sock to enable caching of network

   *	authorizations.

   * @sock_graft:
   *	Sets the socket's isec sid to the sock's sid.
   * @inet_conn_request:
   *	Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
   * @inet_csk_clone:
   *	Sets the new child socket's sid to the openreq sid.

   * @inet_conn_established:

   *	Sets the connection's peersid to the secmark on skb.

   * @secmark_relabel_packet:
   *	check if the process should be allowed to relabel packets to the given secid
   * @security_secmark_refcount_inc
   *	tells the LSM to increment the number of secmark labeling rules loaded
   * @security_secmark_refcount_dec
   *	tells the LSM to decrement the number of secmark labeling rules loaded

   * @req_classify_flow:
   *	Sets the flow's sid to the openreq sid.

   * @tun_dev_create:
   *	Check permissions prior to creating a new TUN device.
   * @tun_dev_post_create:
   *	This hook allows a module to update or allocate a per-socket security
   *	structure.
   *	@sk contains the newly created sock structure.
   * @tun_dev_attach:
   *	Check permissions prior to attaching to a persistent TUN device.  This
   *	hook can also be used by the module to update any security state
   *	associated with the TUN device's sock structure.
   *	@sk contains the existing sock structure.

   *
   * Security hooks for XFRM operations.
   *
   * @xfrm_policy_alloc_security:

   *	@ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
   *	Database used by the XFRM system.

   *	@sec_ctx contains the security context information being provided by
   *	the user-level policy update program (e.g., setkey).

   *	Allocate a security structure to the xp->security field; the security

   *	field is initialized to NULL when the xfrm_policy is allocated.

   *	Return 0 if operation was successful (memory to allocate, legal context)
   * @xfrm_policy_clone_security:

   *	@old_ctx contains an existing xfrm_sec_ctx.
   *	@new_ctxp contains a new xfrm_sec_ctx being cloned from old.
   *	Allocate a security structure in new_ctxp that contains the
   *	information from the old_ctx structure.

   *	Return 0 if operation was successful (memory to allocate).
   * @xfrm_policy_free_security:

   *	@ctx contains the xfrm_sec_ctx

   *	Deallocate xp->security.
   * @xfrm_policy_delete_security:

   *	@ctx contains the xfrm_sec_ctx.

   *	Authorize deletion of xp->security.

   * @xfrm_state_alloc_security:
   *	@x contains the xfrm_state being added to the Security Association
   *	Database by the XFRM system.
   *	@sec_ctx contains the security context information being provided by
   *	the user-level SA generation program (e.g., setkey or racoon).

   *	@secid contains the secid from which to take the mls portion of the context.
   *	Allocate a security structure to the x->security field; the security
   *	field is initialized to NULL when the xfrm_state is allocated. Set the
   *	context to correspond to either sec_ctx or polsec, with the mls portion
   *	taken from secid in the latter case.

   *	Return 0 if operation was successful (memory to allocate, legal context).
   * @xfrm_state_free_security:
   *	@x contains the xfrm_state.

   *	Deallocate x->security.
   * @xfrm_state_delete_security:
   *	@x contains the xfrm_state.
   *	Authorize deletion of x->security.

   * @xfrm_policy_lookup:

   *	@ctx contains the xfrm_sec_ctx for which the access control is being

   *	checked.

   *	@fl_secid contains the flow security label that is used to authorize

   *	access to the policy xp.
   *	@dir contains the direction of the flow (input or output).

   *	Check permission when a flow selects a xfrm_policy for processing

   *	XFRMs on a packet.  The hook is called when selecting either a
   *	per-socket policy or a generic xfrm policy.

   *	Return 0 if permission is granted, -ESRCH otherwise, or -errno
   *	on other errors.

   * @xfrm_state_pol_flow_match:
   *	@x contains the state to match.
   *	@xp contains the policy to check for a match.
   *	@fl contains the flow to check for a match.
   *	Return 1 if there is a match.

   * @xfrm_decode_session:
   *	@skb points to skb to decode.

   *	@secid points to the flow key secid to set.
   *	@ckall says if all xfrms used should be checked for same secid.
   *	Return 0 if ckall is zero or all xfrms used have the same secid.

   *

   * Security hooks affecting all Key Management operations
   *
   * @key_alloc:
   *	Permit allocation of a key and assign security data. Note that key does
   *	not have a serial number assigned at this point.
   *	@key points to the key.

   *	@flags is the allocation flags

   *	Return 0 if permission is granted, -ve error otherwise.
   * @key_free:
   *	Notification of destruction; free security data.
   *	@key points to the key.
   *	No return value.
   * @key_permission:
   *	See whether a specific operational right is granted to a process on a

   *	key.

   *	@key_ref refers to the key (key pointer + possession attribute bit).

   *	@cred points to the credentials to provide the context against which to

   *	evaluate the security data on the key.

   *	@perm describes the combination of permissions required of this key.

   *	Return 0 if permission is granted, -ve error otherwise.

   * @key_getsecurity:
   *	Get a textual representation of the security context attached to a key
   *	for the purposes of honouring KEYCTL_GETSECURITY.  This function
   *	allocates the storage for the NUL-terminated string and the caller
   *	should free it.
   *	@key points to the key to be queried.
   *	@_buffer points to a pointer that should be set to point to the
   *	 resulting string (if no label or an error occurs).
   *	Return the length of the string (including terminating NUL) or -ve if
   *      an error.
   *	May also return 0 (and a NULL buffer pointer) if there is no label.

   *

   * Security hooks affecting all System V IPC operations.
   *
   * @ipc_permission:
   *	Check permissions for access to IPC
   *	@ipcp contains the kernel IPC permission structure
   *	@flag contains the desired (requested) permission set
   *	Return 0 if permission is granted.

   * @ipc_getsecid:
   *	Get the secid associated with the ipc object.
   *	@ipcp contains the kernel IPC permission structure.
   *	@secid contains a pointer to the location where result will be saved.
   *	In case of failure, @secid will be set to zero.

   *
   * Security hooks for individual messages held in System V IPC message queues
   * @msg_msg_alloc_security:
   *	Allocate and attach a security structure to the msg->security field.
   *	The security field is initialized to NULL when the structure is first
   *	created.
   *	@msg contains the message structure to be modified.
   *	Return 0 if operation was successful and permission is granted.
   * @msg_msg_free_security:
   *	Deallocate the security structure for this message.
   *	@msg contains the message structure to be modified.
   *
   * Security hooks for System V IPC Message Queues
   *
   * @msg_queue_alloc_security:
   *	Allocate and attach a security structure to the
   *	msq->q_perm.security field. The security field is initialized to
   *	NULL when the structure is first created.
   *	@msq contains the message queue structure to be modified.
   *	Return 0 if operation was successful and permission is granted.
   * @msg_queue_free_security:
   *	Deallocate security structure for this message queue.
   *	@msq contains the message queue structure to be modified.
   * @msg_queue_associate:
   *	Check permission when a message queue is requested through the
   *	msgget system call.  This hook is only called when returning the
   *	message queue identifier for an existing message queue, not when a
   *	new message queue is created.
   *	@msq contains the message queue to act upon.
   *	@msqflg contains the operation control flags.
   *	Return 0 if permission is granted.
   * @msg_queue_msgctl:
   *	Check permission when a message control operation specified by @cmd
   *	is to be performed on the message queue @msq.
   *	The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
   *	@msq contains the message queue to act upon.  May be NULL.
   *	@cmd contains the operation to be performed.

   *	Return 0 if permission is granted.

   * @msg_queue_msgsnd:
   *	Check permission before a message, @msg, is enqueued on the message
   *	queue, @msq.
   *	@msq contains the message queue to send message to.
   *	@msg contains the message to be enqueued.
   *	@msqflg contains operational flags.
   *	Return 0 if permission is granted.
   * @msg_queue_msgrcv:
   *	Check permission before a message, @msg, is removed from the message

   *	queue, @msq.  The @target task structure contains a pointer to the
   *	process that will be receiving the message (not equal to the current

   *	process when inline receives are being performed).
   *	@msq contains the message queue to retrieve message from.
   *	@msg contains the message destination.
   *	@target contains the task structure for recipient process.
   *	@type contains the type of message requested.
   *	@mode contains the operational flags.
   *	Return 0 if permission is granted.
   *
   * Security hooks for System V Shared Memory Segments
   *
   * @shm_alloc_security:
   *	Allocate and attach a security structure to the shp->shm_perm.security
   *	field.  The security field is initialized to NULL when the structure is
   *	first created.
   *	@shp contains the shared memory structure to be modified.
   *	Return 0 if operation was successful and permission is granted.
   * @shm_free_security:
   *	Deallocate the security struct for this memory segment.
   *	@shp contains the shared memory structure to be modified.
   * @shm_associate:
   *	Check permission when a shared memory region is requested through the
   *	shmget system call.  This hook is only called when returning the shared
   *	memory region identifier for an existing region, not when a new shared
   *	memory region is created.
   *	@shp contains the shared memory structure to be modified.
   *	@shmflg contains the operation control flags.
   *	Return 0 if permission is granted.
   * @shm_shmctl:
   *	Check permission when a shared memory control operation specified by
   *	@cmd is to be performed on the shared memory region @shp.
   *	The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
   *	@shp contains shared memory structure to be modified.
   *	@cmd contains the operation to be performed.
   *	Return 0 if permission is granted.
   * @shm_shmat:
   *	Check permissions prior to allowing the shmat system call to attach the
   *	shared memory segment @shp to the data segment of the calling process.
   *	The attaching address is specified by @shmaddr.
   *	@shp contains the shared memory structure to be modified.
   *	@shmaddr contains the address to attach memory region to.
   *	@shmflg contains the operational flags.
   *	Return 0 if permission is granted.
   *
   * Security hooks for System V Semaphores
   *
   * @sem_alloc_security:
   *	Allocate and attach a security structure to the sma->sem_perm.security
   *	field.  The security field is initialized to NULL when the structure is
   *	first created.
   *	@sma contains the semaphore structure
   *	Return 0 if operation was successful and permission is granted.
   * @sem_free_security:
   *	deallocate security struct for this semaphore
   *	@sma contains the semaphore structure.
   * @sem_associate:
   *	Check permission when a semaphore is requested through the semget
   *	system call.  This hook is only called when returning the semaphore
   *	identifier for an existing semaphore, not when a new one must be
   *	created.
   *	@sma contains the semaphore structure.
   *	@semflg contains the operation control flags.
   *	Return 0 if permission is granted.
   * @sem_semctl:
   *	Check permission when a semaphore operation specified by @cmd is to be

   *	performed on the semaphore @sma.  The @sma may be NULL, e.g. for

   *	IPC_INFO or SEM_INFO.
   *	@sma contains the semaphore structure.  May be NULL.
   *	@cmd contains the operation to be performed.
   *	Return 0 if permission is granted.
   * @sem_semop
   *	Check permissions before performing operations on members of the

   *	semaphore set @sma.  If the @alter flag is nonzero, the semaphore set
   *	may be modified.

   *	@sma contains the semaphore structure.
   *	@sops contains the operations to perform.
   *	@nsops contains the number of operations to perform.
   *	@alter contains the flag indicating whether changes are to be made.
   *	Return 0 if permission is granted.
   *

   * @ptrace_access_check:

   *	Check permission before allowing the current process to trace the

   *	@child process.
   *	Security modules may also want to perform a process tracing check
   *	during an execve in the set_security or apply_creds hooks of

   *	tracing check during an execve in the bprm_set_creds hook of

   *	binprm_security_ops if the process is being traced and its security
   *	attributes would be changed by the execve.

   *	@child contains the task_struct structure for the target process.

   *	@mode contains the PTRACE_MODE flags indicating the form of access.

   *	Return 0 if permission is granted.

   * @ptrace_traceme:
   *	Check that the @parent process has sufficient permission to trace the
   *	current process before allowing the current process to present itself
   *	to the @parent process for tracing.

   *	The parent process will still have to undergo the ptrace_access_check

   *	checks before it is allowed to trace this one.
   *	@parent contains the task_struct structure for debugger process.
   *	Return 0 if permission is granted.

   * @capget:
   *	Get the @effective, @inheritable, and @permitted capability sets for
   *	the @target process.  The hook may also perform permission checking to
   *	determine if the current process is allowed to see the capability sets
   *	of the @target process.
   *	@target contains the task_struct structure for target process.
   *	@effective contains the effective capability set.
   *	@inheritable contains the inheritable capability set.
   *	@permitted contains the permitted capability set.
   *	Return 0 if the capability sets were successfully obtained.

   * @capset:

   *	Set the @effective, @inheritable, and @permitted capability sets for

   *	the current process.

   *	@new contains the new credentials structure for target process.
   *	@old contains the current credentials structure for target process.

   *	@effective contains the effective capability set.
   *	@inheritable contains the inheritable capability set.
   *	@permitted contains the permitted capability set.

   *	Return 0 and update @new if permission is granted.

   * @capable:

   *	Check whether the @tsk process has the @cap capability in the indicated
   *	credentials.

   *	@tsk contains the task_struct for the process.

   *	@cred contains the credentials to use.

   *      @ns contains the user namespace we want the capability in

   *	@cap contains the capability <include/linux/capability.h>.

   *	@audit: Whether to write an audit message or not

   *	Return 0 if the capability is granted for @tsk.

   * @syslog:
   *	Check permission before accessing the kernel message ring or changing
   *	logging to the console.

   *	See the syslog(2) manual page for an explanation of the @type values.

   *	@type contains the type of action.

   *	@from_file indicates the context of action (if it came from /proc).

   *	Return 0 if permission is granted.
   * @settime:
   *	Check permission to change the system time.
   *	struct timespec and timezone are defined in include/linux/time.h
   *	@ts contains new time
   *	@tz contains new timezone
   *	Return 0 if permission is granted.
   * @vm_enough_memory:
   *	Check permissions for allocating a new virtual mapping.

   *	@mm contains the mm struct it is being added to.

   *	@pages contains the number of pages.

   *	Return 0 if permission is granted.
   *

   * @secid_to_secctx:

   *	Convert secid to security context.  If secdata is NULL the length of
   *	the result will be returned in seclen, but no secdata will be returned.
   *	This does mean that the length could change between calls to check the
   *	length and the next call which actually allocates and returns the secdata.

   *	@secid contains the security ID.
   *	@secdata contains the pointer that stores the converted security context.

   *	@seclen pointer which contains the length of the data

   * @secctx_to_secid:

   *	Convert security context to secid.
   *	@secid contains the pointer to the generated security ID.
   *	@secdata contains the security context.

   *
   * @release_secctx:
   *	Release the security context.
   *	@secdata contains the security context.
   *	@seclen contains the length of the security context.
   *

   * Security hooks for Audit
   *
   * @audit_rule_init:
   *	Allocate and initialize an LSM audit rule structure.
   *	@field contains the required Audit action. Fields flags are defined in include/linux/audit.h
   *	@op contains the operator the rule uses.
   *	@rulestr contains the context where the rule will be applied to.
   *	@lsmrule contains a pointer to receive the result.
   *	Return 0 if @lsmrule has been successfully set,
   *	-EINVAL in case of an invalid rule.
   *
   * @audit_rule_known:
   *	Specifies whether given @rule contains any fields related to current LSM.
   *	@rule contains the audit rule of interest.
   *	Return 1 in case of relation found, 0 otherwise.
   *
   * @audit_rule_match:
   *	Determine if given @secid matches a rule previously approved
   *	by @audit_rule_known.
   *	@secid contains the security id in question.
   *	@field contains the field which relates to current LSM.
   *	@op contains the operator that will be used for matching.
   *	@rule points to the audit rule that will be checked against.
   *	@actx points to the audit context associated with the check.
   *	Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
   *
   * @audit_rule_free:
   *	Deallocate the LSM audit rule structure previously allocated by
   *	audit_rule_init.
   *	@rule contains the allocated rule
   *

   * @inode_notifysecctx:
   *	Notify the security module of what the security context of an inode
   *	should be.  Initializes the incore security context managed by the
   *	security module for this inode.  Example usage:  NFS client invokes
   *	this hook to initialize the security context in its incore inode to the
   *	value provided by the server for the file when the server returned the
   *	file's attributes to the client.
   *
   * 	Must be called with inode->i_mutex locked.
   *
   * 	@inode we wish to set the security context of.
   * 	@ctx contains the string which we wish to set in the inode.
   * 	@ctxlen contains the length of @ctx.
   *
   * @inode_setsecctx:
   * 	Change the security context of an inode.  Updates the
   * 	incore security context managed by the security module and invokes the
   * 	fs code as needed (via __vfs_setxattr_noperm) to update any backing
   * 	xattrs that represent the context.  Example usage:  NFS server invokes
   * 	this hook to change the security context in its incore inode and on the
   * 	backing filesystem to a value provided by the client on a SETATTR
   * 	operation.
   *
   * 	Must be called with inode->i_mutex locked.
   *
   * 	@dentry contains the inode we wish to set the security context of.
   * 	@ctx contains the string which we wish to set in the inode.
   * 	@ctxlen contains the length of @ctx.
   *
   * @inode_getsecctx:
   * 	Returns a string containing all relavent security context information
   *

   * 	@inode we wish to get the security context of.

   *	@ctx is a pointer in which to place the allocated security context.
   *	@ctxlen points to the place to put the length of @ctx.

   * This is the main security structure.
   */
  struct security_operations {

  	char name[SECURITY_NAME_MAX + 1];

  	int (*ptrace_access_check) (struct task_struct *child, unsigned int mode);

  	int (*ptrace_traceme) (struct task_struct *parent);

  	int (*capget) (struct task_struct *target,
  		       kernel_cap_t *effective,
  		       kernel_cap_t *inheritable, kernel_cap_t *permitted);

  	int (*capset) (struct cred *new,
  		       const struct cred *old,
  		       const kernel_cap_t *effective,
  		       const kernel_cap_t *inheritable,
  		       const kernel_cap_t *permitted);

  	int (*capable) (struct task_struct *tsk, const struct cred *cred,

  			struct user_namespace *ns, int cap, int audit);

  	int (*quotactl) (int cmds, int type, int id, struct super_block *sb);
  	int (*quota_on) (struct dentry *dentry);

  	int (*syslog) (int type);

  	int (*settime) (const struct timespec *ts, const struct timezone *tz);

  	int (*vm_enough_memory) (struct mm_struct *mm, long pages);

  	int (*bprm_set_creds) (struct linux_binprm *bprm);

  	int (*bprm_check_security) (struct linux_binprm *bprm);
  	int (*bprm_secureexec) (struct linux_binprm *bprm);

  	void (*bprm_committing_creds) (struct linux_binprm *bprm);
  	void (*bprm_committed_creds) (struct linux_binprm *bprm);

  
  	int (*sb_alloc_security) (struct super_block *sb);
  	void (*sb_free_security) (struct super_block *sb);
  	int (*sb_copy_data) (char *orig, char *copy);

  	int (*sb_remount) (struct super_block *sb, void *data);

  	int (*sb_kern_mount) (struct super_block *sb, int flags, void *data);

  	int (*sb_show_options) (struct seq_file *m, struct super_block *sb);

  	int (*sb_statfs) (struct dentry *dentry);

  	int (*sb_mount) (char *dev_name, struct path *path,

  			 char *type, unsigned long flags, void *data);

  	int (*sb_umount) (struct vfsmount *mnt, int flags);

  	int (*sb_pivotroot) (struct path *old_path,
  			     struct path *new_path);

  	int (*sb_set_mnt_opts) (struct super_block *sb,
  				struct security_mnt_opts *opts);

  	void (*sb_clone_mnt_opts) (const struct super_block *oldsb,
  				   struct super_block *newsb);

  	int (*sb_parse_opts_str) (char *options, struct security_mnt_opts *opts);

  #ifdef CONFIG_SECURITY_PATH
  	int (*path_unlink) (struct path *dir, struct dentry *dentry);
  	int (*path_mkdir) (struct path *dir, struct dentry *dentry, int mode);
  	int (*path_rmdir) (struct path *dir, struct dentry *dentry);
  	int (*path_mknod) (struct path *dir, struct dentry *dentry, int mode,
  			   unsigned int dev);

  	int (*path_truncate) (struct path *path);

  	int (*path_symlink) (struct path *dir, struct dentry *dentry,
  			     const char *old_name);
  	int (*path_link) (struct dentry *old_dentry, struct path *new_dir,
  			  struct dentry *new_dentry);
  	int (*path_rename) (struct path *old_dir, struct dentry *old_dentry,
  			    struct path *new_dir, struct dentry *new_dentry);

  	int (*path_chmod) (struct dentry *dentry, struct vfsmount *mnt,
  			   mode_t mode);
  	int (*path_chown) (struct path *path, uid_t uid, gid_t gid);

  	int (*path_chroot) (struct path *path);

  #endif

  	int (*inode_alloc_security) (struct inode *inode);

  	void (*inode_free_security) (struct inode *inode);

  	int (*inode_init_security) (struct inode *inode, struct inode *dir,

  				    const struct qstr *qstr, char **name,
  				    void **value, size_t *len);

  	int (*inode_create) (struct inode *dir,

  			     struct dentry *dentry, int mode);

  	int (*inode_link) (struct dentry *old_dentry,

  			   struct inode *dir, struct dentry *new_dentry);

  	int (*inode_unlink) (struct inode *dir, struct dentry *dentry);
  	int (*inode_symlink) (struct inode *dir,

  			      struct dentry *dentry, const char *old_name);

  	int (*inode_mkdir) (struct inode *dir, struct dentry *dentry, int mode);

  	int (*inode_rmdir) (struct inode *dir, struct dentry *dentry);
  	int (*inode_mknod) (struct inode *dir, struct dentry *dentry,

  			    int mode, dev_t dev);

  	int (*inode_rename) (struct inode *old_dir, struct dentry *old_dentry,

  			     struct inode *new_dir, struct dentry *new_dentry);

  	int (*inode_readlink) (struct dentry *dentry);
  	int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);

  	int (*inode_permission) (struct inode *inode, int mask);

  	int (*inode_setattr)	(struct dentry *dentry, struct iattr *attr);
  	int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry);

  	int (*inode_setxattr) (struct dentry *dentry, const char *name,
  			       const void *value, size_t size, int flags);
  	void (*inode_post_setxattr) (struct dentry *dentry, const char *name,
  				     const void *value, size_t size, int flags);
  	int (*inode_getxattr) (struct dentry *dentry, const char *name);

  	int (*inode_listxattr) (struct dentry *dentry);

  	int (*inode_removexattr) (struct dentry *dentry, const char *name);

  	int (*inode_need_killpriv) (struct dentry *dentry);
  	int (*inode_killpriv) (struct dentry *dentry);

  	int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
  	int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
  	int (*inode_listsecurity) (struct inode *inode, char *buffer, size_t buffer_size);
  	void (*inode_getsecid) (const struct inode *inode, u32 *secid);
  
  	int (*file_permission) (struct file *file, int mask);
  	int (*file_alloc_security) (struct file *file);
  	void (*file_free_security) (struct file *file);
  	int (*file_ioctl) (struct file *file, unsigned int cmd,

  			   unsigned long arg);

  	int (*file_mmap) (struct file *file,

  			  unsigned long reqprot, unsigned long prot,
  			  unsigned long flags, unsigned long addr,
  			  unsigned long addr_only);

  	int (*file_mprotect) (struct vm_area_struct *vma,

  			      unsigned long reqprot,
  			      unsigned long prot);

  	int (*file_lock) (struct file *file, unsigned int cmd);
  	int (*file_fcntl) (struct file *file, unsigned int cmd,

  			   unsigned long arg);

  	int (*file_set_fowner) (struct file *file);
  	int (*file_send_sigiotask) (struct task_struct *tsk,
  				    struct fown_struct *fown, int sig);
  	int (*file_receive) (struct file *file);

  	int (*dentry_open) (struct file *file, const struct cred *cred);

  
  	int (*task_create) (unsigned long clone_flags);

  	int (*cred_alloc_blank) (struct cred *cred, gfp_t gfp);

  	void (*cred_free) (struct cred *cred);

  	int (*cred_prepare)(struct cred *new, const struct cred *old,
  			    gfp_t gfp);

  	void (*cred_transfer)(struct cred *new, const struct cred *old);

  	int (*kernel_act_as)(struct cred *new, u32 secid);
  	int (*kernel_create_files_as)(struct cred *new, struct inode *inode);

  	int (*kernel_module_request)(char *kmod_name);

  	int (*task_fix_setuid) (struct cred *new, const struct cred *old,
  				int flags);

  	int (*task_setpgid) (struct task_struct *p, pid_t pgid);
  	int (*task_getpgid) (struct task_struct *p);
  	int (*task_getsid) (struct task_struct *p);
  	void (*task_getsecid) (struct task_struct *p, u32 *secid);

  	int (*task_setnice) (struct task_struct *p, int nice);
  	int (*task_setioprio) (struct task_struct *p, int ioprio);
  	int (*task_getioprio) (struct task_struct *p);

  	int (*task_setrlimit) (struct task_struct *p, unsigned int resource,
  			struct rlimit *new_rlim);

  	int (*task_setscheduler) (struct task_struct *p);

  	int (*task_getscheduler) (struct task_struct *p);
  	int (*task_movememory) (struct task_struct *p);
  	int (*task_kill) (struct task_struct *p,
  			  struct siginfo *info, int sig, u32 secid);
  	int (*task_wait) (struct task_struct *p);

  	int (*task_prctl) (int option, unsigned long arg2,
  			   unsigned long arg3, unsigned long arg4,

  			   unsigned long arg5);

  	void (*task_to_inode) (struct task_struct *p, struct inode *inode);

  	int (*ipc_permission) (struct kern_ipc_perm *ipcp, short flag);

  	void (*ipc_getsecid) (struct kern_ipc_perm *ipcp, u32 *secid);

  	int (*msg_msg_alloc_security) (struct msg_msg *msg);
  	void (*msg_msg_free_security) (struct msg_msg *msg);
  
  	int (*msg_queue_alloc_security) (struct msg_queue *msq);
  	void (*msg_queue_free_security) (struct msg_queue *msq);
  	int (*msg_queue_associate) (struct msg_queue *msq, int msqflg);
  	int (*msg_queue_msgctl) (struct msg_queue *msq, int cmd);
  	int (*msg_queue_msgsnd) (struct msg_queue *msq,
  				 struct msg_msg *msg, int msqflg);
  	int (*msg_queue_msgrcv) (struct msg_queue *msq,
  				 struct msg_msg *msg,
  				 struct task_struct *target,

  				 long type, int mode);

  	int (*shm_alloc_security) (struct shmid_kernel *shp);
  	void (*shm_free_security) (struct shmid_kernel *shp);
  	int (*shm_associate) (struct shmid_kernel *shp, int shmflg);
  	int (*shm_shmctl) (struct shmid_kernel *shp, int cmd);
  	int (*shm_shmat) (struct shmid_kernel *shp,

  			  char __user *shmaddr, int shmflg);

  	int (*sem_alloc_security) (struct sem_array *sma);
  	void (*sem_free_security) (struct sem_array *sma);
  	int (*sem_associate) (struct sem_array *sma, int semflg);
  	int (*sem_semctl) (struct sem_array *sma, int cmd);
  	int (*sem_semop) (struct sem_array *sma,
  			  struct sembuf *sops, unsigned nsops, int alter);

  	int (*netlink_send) (struct sock *sk, struct sk_buff *skb);
  	int (*netlink_recv) (struct sk_buff *skb, int cap);

  	void (*d_instantiate) (struct dentry *dentry, struct inode *inode);

  	int (*getprocattr) (struct task_struct *p, char *name, char **value);
  	int (*setprocattr) (struct task_struct *p, char *name, void *value, size_t size);
  	int (*secid_to_secctx) (u32 secid, char **secdata, u32 *seclen);

  	int (*secctx_to_secid) (const char *secdata, u32 seclen, u32 *secid);

  	void (*release_secctx) (char *secdata, u32 seclen);

  	int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen);
  	int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
  	int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen);

  #ifdef CONFIG_SECURITY_NETWORK

  	int (*unix_stream_connect) (struct sock *sock, struct sock *other, struct sock *newsk);

  	int (*unix_may_send) (struct socket *sock, struct socket *other);

  
  	int (*socket_create) (int family, int type, int protocol, int kern);

  	int (*socket_post_create) (struct socket *sock, int family,

  				   int type, int protocol, int kern);

  	int (*socket_bind) (struct socket *sock,
  			    struct sockaddr *address, int addrlen);
  	int (*socket_connect) (struct socket *sock,
  			       struct sockaddr *address, int addrlen);
  	int (*socket_listen) (struct socket *sock, int backlog);
  	int (*socket_accept) (struct socket *sock, struct socket *newsock);

  	int (*socket_sendmsg) (struct socket *sock,
  			       struct msghdr *msg, int size);
  	int (*socket_recvmsg) (struct socket *sock,
  			       struct msghdr *msg, int size, int flags);
  	int (*socket_getsockname) (struct socket *sock);
  	int (*socket_getpeername) (struct socket *sock);
  	int (*socket_getsockopt) (struct socket *sock, int level, int optname);
  	int (*socket_setsockopt) (struct socket *sock, int level, int optname);
  	int (*socket_shutdown) (struct socket *sock, int how);
  	int (*socket_sock_rcv_skb) (struct sock *sk, struct sk_buff *skb);

  	int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);

  	int (*socket_getpeersec_dgram) (struct socket *sock, struct sk_buff *skb, u32 *secid);

  	int (*sk_alloc_security) (struct sock *sk, int family, gfp_t priority);

  	void (*sk_free_security) (struct sock *sk);

  	void (*sk_clone_security) (const struct sock *sk, struct sock *newsk);

  	void (*sk_getsecid) (struct sock *sk, u32 *secid);

  	void (*sock_graft) (struct sock *sk, struct socket *parent);
  	int (*inet_conn_request) (struct sock *sk, struct sk_buff *skb,
  				  struct request_sock *req);
  	void (*inet_csk_clone) (struct sock *newsk, const struct request_sock *req);
  	void (*inet_conn_established) (struct sock *sk, struct sk_buff *skb);

  	int (*secmark_relabel_packet) (u32 secid);
  	void (*secmark_refcount_inc) (void);
  	void (*secmark_refcount_dec) (void);

  	void (*req_classify_flow) (const struct request_sock *req, struct flowi *fl);

  	int (*tun_dev_create)(void);
  	void (*tun_dev_post_create)(struct sock *sk);
  	int (*tun_dev_attach)(struct sock *sk);

  #endif	/* CONFIG_SECURITY_NETWORK */

  #ifdef CONFIG_SECURITY_NETWORK_XFRM

  	int (*xfrm_policy_alloc_security) (struct xfrm_sec_ctx **ctxp,

  			struct xfrm_user_sec_ctx *sec_ctx);

  	int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
  	void (*xfrm_policy_free_security) (struct xfrm_sec_ctx *ctx);
  	int (*xfrm_policy_delete_security) (struct xfrm_sec_ctx *ctx);

  	int (*xfrm_state_alloc_security) (struct xfrm_state *x,

  		struct xfrm_user_sec_ctx *sec_ctx,

  		u32 secid);

  	void (*xfrm_state_free_security) (struct xfrm_state *x);

  	int (*xfrm_state_delete_security) (struct xfrm_state *x);

  	int (*xfrm_policy_lookup) (struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir);
  	int (*xfrm_state_pol_flow_match) (struct xfrm_state *x,
  					  struct xfrm_policy *xp,

  					  const struct flowi *fl);

  	int (*xfrm_decode_session) (struct sk_buff *skb, u32 *secid, int ckall);

  #endif	/* CONFIG_SECURITY_NETWORK_XFRM */

  	/* key management security hooks */
  #ifdef CONFIG_KEYS

  	int (*key_alloc) (struct key *key, const struct cred *cred, unsigned long flags);

  	void (*key_free) (struct key *key);
  	int (*key_permission) (key_ref_t key_ref,

  			       const struct cred *cred,

  			       key_perm_t perm);

  	int (*key_getsecurity)(struct key *key, char **_buffer);

  #endif	/* CONFIG_KEYS */

  #ifdef CONFIG_AUDIT

  	int (*audit_rule_init) (u32 field, u32 op, char *rulestr, void **lsmrule);
  	int (*audit_rule_known) (struct audit_krule *krule);
  	int (*audit_rule_match) (u32 secid, u32 field, u32 op, void *lsmrule,
  				 struct audit_context *actx);
  	void (*audit_rule_free) (void *lsmrule);

  #endif /* CONFIG_AUDIT */

  };

  /* prototypes */

  extern int security_init(void);

  extern int security_module_enable(struct security_operations *ops);

  extern int register_security(struct security_operations *ops);

  extern void __init security_fixup_ops(struct security_operations *ops);

  /* Security operations */

  int security_ptrace_access_check(struct task_struct *child, unsigned int mode);

  int security_ptrace_traceme(struct task_struct *parent);

  int security_capget(struct task_struct *target,

  		    kernel_cap_t *effective,
  		    kernel_cap_t *inheritable,
  		    kernel_cap_t *permitted);

  int security_capset(struct cred *new, const struct cred *old,
  		    const kernel_cap_t *effective,
  		    const kernel_cap_t *inheritable,
  		    const kernel_cap_t *permitted);

  int security_capable(struct user_namespace *ns, const struct cred *cred,
  			int cap);
  int security_real_capable(struct task_struct *tsk, struct user_namespace *ns,
  			int cap);
  int security_real_capable_noaudit(struct task_struct *tsk,
  			struct user_namespace *ns, int cap);

  int security_quotactl(int cmds, int type, int id, struct super_block *sb);
  int security_quota_on(struct dentry *dentry);

  int security_syslog(int type);

  int security_settime(const struct timespec *ts, const struct timezone *tz);

  int security_vm_enough_memory(long pages);
  int security_vm_enough_memory_mm(struct mm_struct *mm, long pages);

  int security_vm_enough_memory_kern(long pages);

  int security_bprm_set_creds(struct linux_binprm *bprm);

  int security_bprm_check(struct linux_binprm *bprm);

  void security_bprm_committing_creds(struct linux_binprm *bprm);
  void security_bprm_committed_creds(struct linux_binprm *bprm);

  int security_bprm_secureexec(struct linux_binprm *bprm);
  int security_sb_alloc(struct super_block *sb);
  void security_sb_free(struct super_block *sb);

  int security_sb_copy_data(char *orig, char *copy);

  int security_sb_remount(struct super_block *sb, void *data);

  int security_sb_kern_mount(struct super_block *sb, int flags, void *data);

  int security_sb_show_options(struct seq_file *m, struct super_block *sb);

  int security_sb_statfs(struct dentry *dentry);

  int security_sb_mount(char *dev_name, struct path *path,

  		      char *type, unsigned long flags, void *data);

  int security_sb_umount(struct vfsmount *mnt, int flags);

  int security_sb_pivotroot(struct path *old_path, struct path *new_path);

  int security_sb_set_mnt_opts(struct super_block *sb, struct security_mnt_opts *opts);

  void security_sb_clone_mnt_opts(const struct super_block *oldsb,
  				struct super_block *newsb);

  int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts);

  int security_inode_alloc(struct inode *inode);
  void security_inode_free(struct inode *inode);
  int security_inode_init_security(struct inode *inode, struct inode *dir,

  				 const struct qstr *qstr,
  				 initxattrs initxattrs, void *fs_data);
  int security_old_inode_init_security(struct inode *inode, struct inode *dir,
  				     const struct qstr *qstr, char **name,
  				     void **value, size_t *len);

  int security_inode_create(struct inode *dir, struct dentry *dentry, int mode);
  int security_inode_link(struct dentry *old_dentry, struct inode *dir,
  			 struct dentry *new_dentry);
  int security_inode_unlink(struct inode *dir, struct dentry *dentry);
  int security_inode_symlink(struct inode *dir, struct dentry *dentry,

  			   const char *old_name);

  int security_inode_mkdir(struct inode *dir, struct dentry *dentry, int mode);
  int security_inode_rmdir(struct inode *dir, struct dentry *dentry);
  int security_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
  int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,

  			  struct inode *new_dir, struct dentry *new_dentry);

  int security_inode_readlink(struct dentry *dentry);
  int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd);

  int security_inode_permission(struct inode *inode, int mask);

  int security_inode_setattr(struct dentry *dentry, struct iattr *attr);
  int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry);

  int security_inode_setxattr(struct dentry *dentry, const char *name,
  			    const void *value, size_t size, int flags);
  void security_inode_post_setxattr(struct dentry *dentry, const char *name,
  				  const void *value, size_t size, int flags);
  int security_inode_getxattr(struct dentry *dentry, const char *name);

  int security_inode_listxattr(struct dentry *dentry);

  int security_inode_removexattr(struct dentry *dentry, const char *name);

  int security_inode_need_killpriv(struct dentry *dentry);
  int security_inode_killpriv(struct dentry *dentry);

  int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);

  int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
  int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);

  void security_inode_getsecid(const struct inode *inode, u32 *secid);

  int security_file_permission(struct file *file, int mask);
  int security_file_alloc(struct file *file);
  void security_file_free(struct file *file);
  int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  int security_file_mmap(struct file *file, unsigned long reqprot,
  			unsigned long prot, unsigned long flags,
  			unsigned long addr, unsigned long addr_only);
  int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,

  			   unsigned long prot);

  int security_file_lock(struct file *file, unsigned int cmd);
  int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg);
  int security_file_set_fowner(struct file *file);
  int security_file_send_sigiotask(struct task_struct *tsk,

  				 struct fown_struct *fown, int sig);

  int security_file_receive(struct file *file);

  int security_dentry_open(struct file *file, const struct cred *cred);

  int security_task_create(unsigned long clone_flags);

  int security_cred_alloc_blank(struct cred *cred, gfp_t gfp);

  void security_cred_free(struct cred *cred);

  int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp);

  void security_transfer_creds(struct cred *new, const struct cred *old);

  int security_kernel_act_as(struct cred *new, u32 secid);
  int security_kernel_create_files_as(struct cred *new, struct inode *inode);

  int security_kernel_module_request(char *kmod_name);

  int security_task_fix_setuid(struct cred *new, const struct cred *old,
  			     int flags);

  int security_task_setpgid(struct task_struct *p, pid_t pgid);
  int security_task_getpgid(struct task_struct *p);
  int security_task_getsid(struct task_struct *p);
  void security_task_getsecid(struct task_struct *p, u32 *secid);

  int security_task_setnice(struct task_struct *p, int nice);
  int security_task_setioprio(struct task_struct *p, int ioprio);
  int security_task_getioprio(struct task_struct *p);

  int security_task_setrlimit(struct task_struct *p, unsigned int resource,
  		struct rlimit *new_rlim);

  int security_task_setscheduler(struct task_struct *p);

  int security_task_getscheduler(struct task_struct *p);
  int security_task_movememory(struct task_struct *p);
  int security_task_kill(struct task_struct *p, struct siginfo *info,
  			int sig, u32 secid);
  int security_task_wait(struct task_struct *p);
  int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,

  			unsigned long arg4, unsigned long arg5);

  void security_task_to_inode(struct task_struct *p, struct inode *inode);
  int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag);

  void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid);

  int security_msg_msg_alloc(struct msg_msg *msg);
  void security_msg_msg_free(struct msg_msg *msg);
  int security_msg_queue_alloc(struct msg_queue *msq);
  void security_msg_queue_free(struct msg_queue *msq);
  int security_msg_queue_associate(struct msg_queue *msq, int msqflg);
  int security_msg_queue_msgctl(struct msg_queue *msq, int cmd);
  int security_msg_queue_msgsnd(struct msg_queue *msq,

  			      struct msg_msg *msg, int msqflg);

  int security_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,

  			      struct task_struct *target, long type, int mode);

  int security_shm_alloc(struct shmid_kernel *shp);
  void security_shm_free(struct shmid_kernel *shp);
  int security_shm_associate(struct shmid_kernel *shp, int shmflg);
  int security_shm_shmctl(struct shmid_kernel *shp, int cmd);
  int security_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg);
  int security_sem_alloc(struct sem_array *sma);
  void security_sem_free(struct sem_array *sma);
  int security_sem_associate(struct sem_array *sma, int semflg);
  int security_sem_semctl(struct sem_array *sma, int cmd);
  int security_sem_semop(struct sem_array *sma, struct sembuf *sops,
  			unsigned nsops, int alter);

  void security_d_instantiate(struct dentry *dentry, struct inode *inode);

  int security_getprocattr(struct task_struct *p, char *name, char **value);
  int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size);
  int security_netlink_send(struct sock *sk, struct sk_buff *skb);
  int security_netlink_recv(struct sk_buff *skb, int cap);
  int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);

  int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);

  void security_release_secctx(char *secdata, u32 seclen);

  int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
  int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
  int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen);

  #else /* CONFIG_SECURITY */

  struct security_mnt_opts {
  };
  
  static inline void security_init_mnt_opts(struct security_mnt_opts *opts)
  {
  }
  
  static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  {
  }

  
  /*
   * This is the default capabilities functionality.  Most of these functions
   * are just stubbed out, but a few must call the proper capable code.
   */
  
  static inline int security_init(void)
  {
  	return 0;
  }

  static inline int security_ptrace_access_check(struct task_struct *child,

  					     unsigned int mode)
  {

  	return cap_ptrace_access_check(child, mode);

  }

  static inline int security_ptrace_traceme(struct task_struct *parent)

  {

  	return cap_ptrace_traceme(parent);

  }

  static inline int security_capget(struct task_struct *target,

  				   kernel_cap_t *effective,
  				   kernel_cap_t *inheritable,
  				   kernel_cap_t *permitted)
  {

  	return cap_capget(target, effective, inheritable, permitted);

  }

  static inline int security_capset(struct cred *new,
  				   const struct cred *old,
  				   const kernel_cap_t *effective,
  				   const kernel_cap_t *inheritable,
  				   const kernel_cap_t *permitted)

  {

  	return cap_capset(new, old, effective, inheritable, permitted);

  }

  static inline int security_capable(struct user_namespace *ns,
  				   const struct cred *cred, int cap)

  {

  	return cap_capable(current, cred, ns, cap, SECURITY_CAP_AUDIT);

  }

  static inline int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int cap)

  {

  	int ret;
  
  	rcu_read_lock();

  	ret = cap_capable(tsk, __task_cred(tsk), ns, cap, SECURITY_CAP_AUDIT);

  	rcu_read_unlock();
  	return ret;
  }
  
  static inline

  int security_real_capable_noaudit(struct task_struct *tsk, struct user_namespace *ns, int cap)

  {
  	int ret;
  
  	rcu_read_lock();

  	ret = cap_capable(tsk, __task_cred(tsk), ns, cap,

  			       SECURITY_CAP_NOAUDIT);
  	rcu_read_unlock();
  	return ret;

  }

  static inline int security_quotactl(int cmds, int type, int id,
  				     struct super_block *sb)

  {
  	return 0;
  }

  static inline int security_quota_on(struct dentry *dentry)

  {
  	return 0;
  }

  static inline int security_syslog(int type)

  {

  	return 0;

  }

  static inline int security_settime(const struct timespec *ts,
  				   const struct timezone *tz)

  {
  	return cap_settime(ts, tz);
  }
  
  static inline int security_vm_enough_memory(long pages)
  {

  	WARN_ON(current->mm == NULL);

  	return cap_vm_enough_memory(current->mm, pages);
  }

  static inline int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)

  {

  	WARN_ON(mm == NULL);
  	return cap_vm_enough_memory(mm, pages);

  }

  static inline int security_vm_enough_memory_kern(long pages)

  {

  	/* If current->mm is a kernel thread then we will pass NULL,
  	   for this specific case that is fine */
  	return cap_vm_enough_memory(current->mm, pages);

  }

  static inline int security_bprm_set_creds(struct linux_binprm *bprm)

  {

  	return cap_bprm_set_creds(bprm);

  }

  static inline int security_bprm_check(struct linux_binprm *bprm)

  {

  	return 0;

  }

  static inline void security_bprm_committing_creds(struct linux_binprm *bprm)

  {

  }

  static inline void security_bprm_committed_creds(struct linux_binprm *bprm)

  {

  }

  static inline int security_bprm_secureexec(struct linux_binprm *bprm)

  {
  	return cap_bprm_secureexec(bprm);
  }

  static inline int security_sb_alloc(struct super_block *sb)

  {
  	return 0;
  }

  static inline void security_sb_free(struct super_block *sb)

  { }

  static inline int security_sb_copy_data(char *orig, char *copy)

  {
  	return 0;
  }

  static inline int security_sb_remount(struct super_block *sb, void *data)
  {
  	return 0;
  }

  static inline int security_sb_kern_mount(struct super_block *sb, int flags, void *data)

  {
  	return 0;
  }

  static inline int security_sb_show_options(struct seq_file *m,
  					   struct super_block *sb)
  {
  	return 0;
  }

  static inline int security_sb_statfs(struct dentry *dentry)

  {
  	return 0;
  }

  static inline int security_sb_mount(char *dev_name, struct path *path,

  				    char *type, unsigned long flags,
  				    void *data)
  {
  	return 0;
  }

  static inline int security_sb_umount(struct vfsmount *mnt, int flags)

  {
  	return 0;
  }

  static inline int security_sb_pivotroot(struct path *old_path,
  					struct path *new_path)

  {
  	return 0;
  }

  static inline int security_sb_set_mnt_opts(struct super_block *sb,
  					   struct security_mnt_opts *opts)
  {
  	return 0;
  }
  
  static inline void security_sb_clone_mnt_opts(const struct super_block *oldsb,
  					      struct super_block *newsb)
  { }
  
  static inline int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
  {
  	return 0;
  }

  static inline int security_inode_alloc(struct inode *inode)

  {
  	return 0;
  }

  static inline void security_inode_free(struct inode *inode)

  { }

  static inline int security_inode_init_security(struct inode *inode,

  						struct inode *dir,

  						const struct qstr *qstr,

  						initxattrs initxattrs,
  						void *fs_data)

  {

  	return 0;

  }

  static inline int security_old_inode_init_security(struct inode *inode,
  						   struct inode *dir,
  						   const struct qstr *qstr,
  						   char **name, void **value,
  						   size_t *len)

  {

  	return 0;

  }

  static inline int security_inode_create(struct inode *dir,

  					 struct dentry *dentry,
  					 int mode)
  {
  	return 0;
  }

  static inline int security_inode_link(struct dentry *old_dentry,

  				       struct inode *dir,
  				       struct dentry *new_dentry)
  {
  	return 0;
  }

  static inline int security_inode_unlink(struct inode *dir,

  					 struct dentry *dentry)
  {
  	return 0;
  }

  static inline int security_inode_symlink(struct inode *dir,

  					  struct dentry *dentry,
  					  const char *old_name)
  {
  	return 0;
  }

  static inline int security_inode_mkdir(struct inode *dir,

  					struct dentry *dentry,
  					int mode)
  {
  	return 0;
  }

  static inline int security_inode_rmdir(struct inode *dir,

  					struct dentry *dentry)
  {
  	return 0;
  }

  static inline int security_inode_mknod(struct inode *dir,

  					struct dentry *dentry,
  					int mode, dev_t dev)
  {
  	return 0;
  }

  static inline int security_inode_rename(struct inode *old_dir,

  					 struct dentry *old_dentry,
  					 struct inode *new_dir,
  					 struct dentry *new_dentry)
  {
  	return 0;
  }

  static inline int security_inode_readlink(struct dentry *dentry)

  {
  	return 0;
  }

  static inline int security_inode_follow_link(struct dentry *dentry,

  					      struct nameidata *nd)
  {
  	return 0;
  }

  static inline int security_inode_permission(struct inode *inode, int mask)

  {
  	return 0;
  }