Mr.X

/*
 * Linux Security Module interfaces
 *
 * 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)
 * Copyright (C) 2015 Intel Corporation.
 * Copyright (C) 2015 Casey Schaufler <casey@schaufler-ca.com>
 * Copyright (C) 2016 Mellanox Techonologies
 *
 *	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_LSM_HOOKS_H
#define __LINUX_LSM_HOOKS_H

#include <linux/security.h>
#include <linux/init.h>
#include <linux/rculist.h>
#include <linux/xattr.h>
#include <linux/static_call.h>
#include <linux/unroll.h>
#include <linux/jump_label.h>
#include <linux/lsm_count.h>

/**
 * union security_list_options - Linux Security Module hook function list
 *
 * Security hooks for program execution operations.
 *
 * @bprm_creds_for_exec:
 *	If the setup in prepare_exec_creds did not setup @bprm->cred->security
 *	properly for executing @bprm->file, update the LSM's portion of
 *	@bprm->cred->security to be what commit_creds needs to install for the
 *	new program.  This hook may also optionally check permissions
 *	(e.g. for transitions between security domains).
 *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
 *	request libc enable secure mode.
 *	@bprm contains the linux_binprm structure.
 *	Return 0 if the hook is successful and permission is granted.
 * @bprm_creds_from_file:
 *	If @file is setpcap, suid, sgid or otherwise marked to change
 *	privilege upon exec, update @bprm->cred to reflect that change.
 *	This is called after finding the binary that will be executed.
 *	without an interpreter.  This ensures that the credentials will not
 *	be derived from a script that the binary will need to reopen, which
 *	when reopend may end up being a completely different file.  This
 *	hook may also optionally check permissions (e.g. for transitions
 *	between security domains).
 *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
 *	request libc enable secure mode.
 *	The hook must add to @bprm->per_clear any personality flags that
 * 	should be cleared from current->personality.
 *	@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 against the @bprm->cred->security value
 *	which was set in the preceding creds_for_exec call.  The argv list and
 *	envp list are reliably available in @bprm.  This hook may be called
 *	multiple times during a single execve.
 *	@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_creds_for_exec 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().
 *
 * Security hooks for mount using fs_context.
 *	[See also Documentation/filesystems/mount_api.rst]
 *
 * @fs_context_dup:
 *	Allocate and attach a security structure to sc->security.  This pointer
 *	is initialised to NULL by the caller.
 *	@fc indicates the new filesystem context.
 *	@src_fc indicates the original filesystem context.
 * @fs_context_parse_param:
 *	Userspace provided a parameter to configure a superblock.  The LSM may
 *	reject it with an error and may use it for itself, in which case it
 *	should return 0; otherwise it should return -ENOPARAM to pass it on to
 *	the filesystem.
 *	@fc indicates the filesystem context.
 *	@param The parameter
 *
 * 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_delete:
 *	Release objects tied to a superblock (e.g. inodes).
 *	@sb contains the super_block structure being released.
 * @sb_free_security:
 *	Deallocate and clear the sb->s_security field.
 *	@sb contains the super_block structure to be modified.
 * @sb_free_mnt_opts:
 * 	Free memory associated with @mnt_ops.
 * @sb_eat_lsm_opts:
 * 	Eat (scan @orig options) and save them in @mnt_opts.
 * @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_mnt_opts_compat:
 *	Determine if the new mount options in @mnt_opts are allowed given
 *	the existing mounted filesystem at @sb.
 *	@sb superblock being compared
 *	@mnt_opts new mount options
 *	Return 0 if options are compatible.
 * @sb_remount:
 *	Extracts security system specific mount options and verifies 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_kern_mount:
 * 	Mount this @sb if allowed by permissions.
 * @sb_show_options:
 * 	Show (print on @m) mount options for this @sb.
 * @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
 * @move_mount:
 *	Check permission before a mount is moved.
 *	@from_path indicates the mount that is going to be moved.
 *	@to_path indicates the mountpoint that will be mounted upon.
 * @dentry_init_security:
 *	Compute a context for a dentry as the inode is not yet available
 *	since NFSv4 has no label backed by an EA anyway.
 *	@dentry dentry to use in calculating the context.
 *	@mode mode used to determine resource type.
 *	@name name of the last path component used to create file
 *	@xattr_name pointer to place the pointer to security xattr name.
 *		    Caller does not have to free the resulting pointer. Its
 *		    a pointer to static string.
 *	@ctx pointer to place the pointer to the resulting context in.
 *	@ctxlen point to place the length of the resulting context.
 * @dentry_create_files_as:
 *	Compute a context for a dentry as the inode is not yet available
 *	and set that context in passed in creds so that new files are
 *	created using that context. Context is calculated using the
 *	passed in creds and not the creds of the caller.
 *	@dentry dentry to use in calculating the context.
 *	@mode mode used to determine resource type.
 *	@name name of the last path component used to create file
 *	@old creds which should be used for context calculation
 *	@new creds to modify
 *
 *
 * 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_init_security_anon:
 *      Set up the incore security field for the new anonymous inode
 *      and return whether the inode creation is permitted by the security
 *      module or not.
 *      @inode contains the inode structure
 *      @name name of the anonymous inode class
 *      @context_inode optional related inode
 *	Returns 0 on success, -EACCES if the security module denies the
 *	creation of this inode, or another -errno upon other errors.
 * @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 structure @dir.
 *	@dir contains 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 structure @path.
 *	@dir contains 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.
 *	@flags may contain rename options such as RENAME_EXCHANGE.
 *	Return 0 if permission is granted.
 * @path_chmod:
 *	Check for permission to change a mode of the file @path. The new
 *	mode is specified in @mode.
 *	@path contains the path structure of the file to change the mode.
 *	@mode contains the new DAC's permission, which is a bitmask of
 *	constants from <include/uapi/linux/stat.h>
 *	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.
 * @path_notify:
 *	Check permissions before setting a watch on events as defined by @mask,
 *	on an object at @path, whose type is defined by @obj_type.
 * @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.
 *	@inode contains the inode, which itself is not stable in RCU-walk
 *	@rcu indicates whether we are in RCU-walk mode.
 *	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 the file indicated by path.
 *	Note that truncation permissions may also be checked based on
 *	already opened files, using the @file_truncate hook.
 *	@path contains the path structure for the file.
 *	Return 0 if permission is granted.
 * @inode_getattr:
 *	Check permission before obtaining file attributes.
 *	@path contains the path 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_set_acl:
 *	Check permission before setting posix acls
 *	The posix acls in @kacl are identified by @acl_name.
 *	Return 0 if permission is granted.
 * @inode_get_acl:
 *	Check permission before getting osix acls
 *	The posix acls are identified by @acl_name.
 *	Return 0 if permission is granted.
 * @inode_remove_acl:
 *	Check permission before removing posix acls
 *	The posix acls are identified by @acl_name.
 *	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.
 *	@idmap: idmap of the mount.
 *	@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.
 * @inode_copy_up:
 *	A file is about to be copied up from lower layer to upper layer of
 *	overlay filesystem. Security module can prepare a set of new creds
 *	and modify as need be and return new creds. Caller will switch to
 *	new creds temporarily to create new file and release newly allocated
 *	creds.
 *	@src indicates the union dentry of file that is being copied up.
 *	@new pointer to pointer to return newly allocated creds.
 *	Returns 0 on success or a negative error code on error.
 * @inode_copy_up_xattr:
 *	Filter the xattrs being copied up when a unioned file is copied
 *	up from a lower layer to the union/overlay layer.
 *	@name indicates the name of the xattr.
 *	Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP if
 *	security module does not know about attribute or a negative error code
 *	to abort the copy up. Note that the caller is responsible for reading
 *	and writing the xattrs as this hook is merely a filter.
 * @d_instantiate:
 * 	Fill in @inode security information for a @dentry if allowed.
 * @getprocattr:
 * 	Read attribute @name for process @p and store it into @value if allowed.
 * @setprocattr:
 * 	Write (set) attribute @name to @value, size @size if allowed.
 *
 * Security hooks for kernfs node operations
 *
 * @kernfs_init_security:
 *	Initialize the security context of a newly created kernfs node based
 *	on its own and its parent's attributes.
 *
 *	@kn_dir the parent kernfs node
 *	@kn the new child kernfs node
 *
 * 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
 *	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.
 * @mmap_addr :
 *	Check permissions for a mmap operation at @addr.
 *	@addr contains virtual address that will be used for the operation.
 *	Return 0 if permission is granted.
 * @mmap_file :
 *	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 the 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 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.
 * @file_truncate:
 *	Check permission before truncating a file, i.e. using ftruncate.
 *	Note that truncation permission may also be checked based on the path,
 *	using the @path_truncate hook.
 *	@file contains the file structure for the file.
 *	Return 0 if permission is granted.
 * @file_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_alloc:
 *	@task task being allocated.
 *	@clone_flags contains the flags indicating what should be shared.
 *	Handle allocation of task-related resources.
 *	Returns a zero on success, negative values on failure.
 * @task_free:
 *	@task task about to be freed.
 *	Handle release of task-related resources. (Note that this can be called
 *	from interrupt context.)
 * @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
 * @cred_getsecid:
 *	Retrieve the security identifier of the cred structure @c
 *	@c contains the credentials, secid will be placed into @secid.
 *	In case of failure, @secid will be set to zero.
 * @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.
 * @kernel_load_data:
 *	Load data provided by userspace.
 *	@id kernel load data identifier
 *	@contents if a subsequent @kernel_post_load_data will be called.
 *	Return 0 if permission is granted.
 * @kernel_post_load_data:
 *	Load data provided by a non-file source (usually userspace buffer).
 *	@buf pointer to buffer containing the data contents.
 *	@size length of the data contents.
 *	@id kernel load data identifier
 *	@description a text description of what was loaded, @id-specific
 *	Return 0 if permission is granted.
 *	This must be paired with a prior @kernel_load_data call that had
 *	@contents set to true.
 * @kernel_read_file:
 *	Read a file specified by userspace.
 *	@file contains the file structure pointing to the file being read
 *	by the kernel.
 *	@id kernel read file identifier
 *	@contents if a subsequent @kernel_post_read_file will be called.
 *	Return 0 if permission is granted.
 * @kernel_post_read_file:
 *	Read a file specified by userspace.
 *	@file contains the file structure pointing to the file being read
 *	by the kernel.
 *	@buf pointer to buffer containing the file contents.
 *	@size length of the file contents.
 *	@id kernel read file identifier
 *	This must be paired with a prior @kernel_read_file call that had
 *	@contents set to true.
 *	Return 0 if permission is granted.
 * @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_fix_setgid:
 *	Update the module's state after setting one or more of the group
 *	identity attributes of the current process.  The @flags parameter
 *	indicates which of the set*gid system calls invoked this hook.
 *	@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 replaced.
 *	@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.
 * @current_getsecid_subj:
 *	Retrieve the subjective security identifier of the current task and
 *	return it in @secid.
 *	In case of failure, @secid will be set to zero.
 * @task_getsecid_obj:
 *	Retrieve the objective security identifier of the task_struct in @p
 *	and return it in @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_prlimit:
 *	Check permission before getting and/or setting the resource limits of
 *	another task.
 *	@cred points to the cred structure for the current task.
 *	@tcred points to the cred structure for the target task.
 *	@flags contains the LSM_PRLIMIT_* flag bits indicating whether the
 *	resource limits are being read, modified, or both.
 *	Return 0 if permission is granted.
 * @task_setrlimit:
 *	Check permission before setting the resource limits of process @p
 *	for @resource to @new_rlim.  The old resource limit values can
 *	be examined by dereferencing (p->signal->rlim + resource).
 *	@p points to the task_struct for the target task's group leader.
 *	@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.
 *	@p contains the task_struct for process.
 *	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 kernel_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.
 *	@cred contains the cred of the process where the signal originated, or
 *	NULL if the current task is the originator.
 *	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.
 *
 * 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.
 *	@other 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 attach security information to
 *	SOCK_INODE(sock)->i_security.  This hook may be used to update the
 *	SOCK_INODE(sock)->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_socketpair:
 *	Check permissions before creating a fresh pair of sockets.
 *	@socka contains the first socket structure.
 *	@sockb contains the second socket structure.
 *	Return 0 if permission is granted and the connection was established.
 * @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 memory where the security state is to be copied.
 *	@optlen memory 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.
 *	@sock contains the peer socket. May be NULL.
 *	@skb is the sk_buff for the packet being queried. May be NULL.
 *	@secid pointer to store the secid of the packet.
 *	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
 * @secmark_refcount_inc:
 *	tells the LSM to increment the number of secmark labeling rules loaded
 * @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_alloc_security:
 *	This hook allows a module to allocate a security structure for a TUN
 *	device.
 *	@security pointer to a security structure pointer.
 *	Returns a zero on success, negative values on failure.
 * @tun_dev_free_security:
 *	This hook allows a module to free the security structure for a TUN
 *	device.
 *	@security pointer to the TUN device's security structure
 * @tun_dev_create:
 *	Check permissions prior to creating a new TUN device.
 * @tun_dev_attach_queue:
 *	Check permissions prior to attaching to a TUN device queue.
 *	@security pointer to the TUN device's security structure.
 * @tun_dev_attach:
 *	This hook can 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 pointer to the TUN device's security structure.
 * @tun_dev_open:
 *	This hook can be used by the module to update any security state
 *	associated with the TUN device's security structure.
 *	@security pointer to the TUN devices's security structure.
 *
 * Security hooks for SCTP
 *
 * @sctp_assoc_request:
 *	Passes the @asoc and @chunk->skb of the association INIT packet to
 *	the security module.
 *	@asoc pointer to sctp association structure.
 *	@skb pointer to skbuff of association packet.
 *	Return 0 on success, error on failure.
 * @sctp_bind_connect:
 *	Validiate permissions required for each address associated with sock
 *	@sk. Depending on @optname, the addresses will be treated as either
 *	for a connect or bind service. The @addrlen is calculated on each
 *	ipv4 and ipv6 address using sizeof(struct sockaddr_in) or
 *	sizeof(struct sockaddr_in6).
 *	@sk pointer to sock structure.
 *	@optname name of the option to validate.
 *	@address list containing one or more ipv4/ipv6 addresses.
 *	@addrlen total length of address(s).
 *	Return 0 on success, error on failure.
 * @sctp_sk_clone:
 *	Called whenever a new socket is created by accept(2) (i.e. a TCP
 *	style socket) or when a socket is 'peeled off' e.g userspace
 *	calls sctp_peeloff(3).
 *	@asoc pointer to current sctp association structure.
 *	@sk pointer to current sock structure.
 *	@newsk pointer to new sock structure.
 * @sctp_assoc_established:
 *	Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet
 *	to the security module.
 *	@asoc pointer to sctp association structure.
 *	@skb pointer to skbuff of association packet.
 *
 * Security hooks for Infiniband
 *
 * @ib_pkey_access:
 *	Check permission to access a pkey when modifing a QP.
 *	@subnet_prefix the subnet prefix of the port being used.
 *	@pkey the pkey to be accessed.
 *	@sec pointer to a security structure.
 * @ib_endport_manage_subnet:
 *	Check permissions to send and receive SMPs on a end port.
 *	@dev_name the IB device name (i.e. mlx4_0).
 *	@port_num the port number.
 *	@sec pointer to a security structure.
 * @ib_alloc_security:
 *	Allocate a security structure for Infiniband objects.
 *	@sec pointer to a security structure pointer.
 *	Returns 0 on success, non-zero on failure
 * @ib_free_security:
 *	Deallocate an Infiniband security structure.
 *	@sec contains the security structure to be freed.
 *
 * 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)
 *	@gfp is to specify the context for the allocation
 * @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:
 *	@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).
 *	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 sec_ctx. Return 0 if operation was successful
 *	(memory to allocate, legal context).
 * @xfrm_state_alloc_acquire:
 *	@x contains the xfrm_state being added to the Security Association
 *	Database by the XFRM system.
 *	@polsec contains the policy's security context.
 *	@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 secid. 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.
 *	@flic contains the flowi_common struct 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
 *	@perm->security field. The security field is initialized to
 *	NULL when the structure is first created.
 *	@perm contains the IPC permissions of the message queue.
 *	Return 0 if operation was successful and permission is granted.
 * @msg_queue_free_security:
 *	Deallocate security field @perm->security for the message queue.
 *	@perm contains the IPC permissions of the message queue.
 * @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.
 *	@perm contains the IPC permissions of the message queue.
 *	@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 with permissions @perm.
 *	The @perm may be NULL, e.g. for IPC_INFO or MSG_INFO.
 *	@perm contains the IPC permissions of the msg queue. 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 with permissions @perm.
 *	@perm contains the IPC permissions of the message queue.
 *	@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. 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).
 *	@perm contains the IPC permissions of the message queue.
 *	@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 @perm->security
 *	field. The security field is initialized to NULL when the structure is
 *	first created.
 *	@perm contains the IPC permissions of the shared memory structure.
 *	Return 0 if operation was successful and permission is granted.
 * @shm_free_security:
 *	Deallocate the security structure @perm->security for the memory segment.
 *	@perm contains the IPC permissions of the shared memory structure.
 * @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.
 *	@perm contains the IPC permissions of the shared memory structure.
 *	@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 with permissions @perm.
 *	The @perm may be NULL, e.g. for IPC_INFO or SHM_INFO.
 *	@perm contains the IPC permissions of the shared memory structure.
 *	@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 with permissions @perm to the data segment of the
 *	calling process. The attaching address is specified by @shmaddr.
 *	@perm contains the IPC permissions of the shared memory structure.
 *	@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 @perm->security
 *	field. The security field is initialized to NULL when the structure is
 *	first created.
 *	@perm contains the IPC permissions of the semaphore.
 *	Return 0 if operation was successful and permission is granted.
 * @sem_free_security:
 *	Deallocate security structure @perm->security for the semaphore.
 *	@perm contains the IPC permissions of the semaphore.
 * @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.
 *	@perm contains the IPC permissions of the semaphore.
 *	@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. The @perm may be NULL, e.g. for
 *	IPC_INFO or SEM_INFO.
 *	@perm contains the IPC permissions of the semaphore. 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. If the @alter flag is nonzero, the semaphore set
 *	may be modified.
 *	@perm contains the IPC permissions of the semaphore.
 *	@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.
 *
 * @binder_set_context_mgr:
 *	Check whether @mgr is allowed to be the binder context manager.
 *	@mgr contains the task_struct for the task being registered.
 *	Return 0 if permission is granted.
 * @binder_transaction:
 *	Check whether @from is allowed to invoke a binder transaction call
 *	to @to.
 *	@from contains the task_struct for the sending task.
 *	@to contains the task_struct for the receiving task.
 * @binder_transfer_binder:
 *	Check whether @from is allowed to transfer a binder reference to @to.
 *	@from contains the task_struct for the sending task.
 *	@to contains the task_struct for the receiving task.
 * @binder_transfer_file:
 *	Check whether @from is allowed to transfer @file to @to.
 *	@from contains the task_struct for the sending task.
 *	@file contains the struct file being transferred.
 *	@to contains the task_struct for the receiving task.
 *
 * @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.
 *	@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.
 *	@cred contains the credentials to use.
 *	@ns contains the user namespace we want the capability in
 *	@cap contains the capability <include/linux/capability.h>.
 *	@opts contains options for the capable check <include/linux/security.h>
 *	Return 0 if the capability is granted for @tsk.
 * @quotactl:
 * 	Check whether the quotactl syscall is allowed for this @sb.
 * @quota_on:
 * 	Check whether QUOTAON is allowed for this @dentry.
 * @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 SYSLOG_ACTION_* constant from <include/linux/syslog.h>
 *	Return 0 if permission is granted.
 * @settime:
 *	Check permission to change the system time.
 *	struct timespec64 is defined in <include/linux/time64.h> and timezone
 *	is 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 by the LSM infrastructure to the
 *	caller. If all LSMs return a positive value, __vm_enough_memory() will
 *	be called with cap_sys_admin set. If at least one LSM returns 0 or
 *	negative, __vm_enough_memory() will be called with cap_sys_admin
 *	cleared.
 *
 * @ismaclabel:
 *	Check if the extended attribute specified by @name
 *	represents a MAC label. Returns 1 if name is a MAC
 *	attribute otherwise returns 0.
 *	@name full extended attribute name to check against
 *	LSM as a MAC label.
 *
 * @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 @krule contains any fields related to
 *	current LSM.
 *	@krule 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.
 *	@lrule points to the audit rule that will be checked against.
 *	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.
 *	@lsmrule contains the allocated rule
 *
 * @inode_invalidate_secctx:
 *	Notify the security module that it must revalidate the security context
 *	of an inode.
 *
 * @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:
 *	On success, returns 0 and fills out @ctx and @ctxlen with the security
 *	context for the given @inode.
 *	@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.
 *
 * Security hooks for the general notification queue:
 *
 * @post_notification:
 *	Check to see if a watch notification can be posted to a particular
 *	queue.
 *	@w_cred: The credentials of the whoever set the watch.
 *	@cred: The event-triggerer's credentials
 *	@n: The notification being posted
 *
 * @watch_key:
 *	Check to see if a process is allowed to watch for event notifications
 *	from a key or keyring.
 *	@key: The key to watch.
 *
 * @locked_down:
 *     Determine whether a kernel feature that potentially enables arbitrary
 *     code execution in kernel space should be permitted.
 *
 *     @what: kernel feature being accessed
 *
 * @lock_kernel_down
 * 	Put the kernel into lock-down mode.
 *
 * 	@where: Where the lock-down is originating from (e.g. command line option)
 * 	@level: The lock-down level (can only increase)
 *
 * Security hooks for perf events
 *
 * @perf_event_open:
 * 	Check whether the @type of perf_event_open syscall is allowed.
 * @perf_event_alloc:
 * 	Allocate and save perf_event security info.
 * @perf_event_free:
 * 	Release (free) perf_event security info.
 * @perf_event_read:
 * 	Read perf_event security info if allowed.
 * @perf_event_write:
 * 	Write perf_event security info if allowed.
 *
 * Security hooks for io_uring
 *
 * @uring_override_creds:
 *      Check if the current task, executing an io_uring operation, is allowed
 *      to override it's credentials with @new.
 *
 *      @new: the new creds to use
 *
 * @uring_sqpoll:
 *      Check whether the current task is allowed to spawn a io_uring polling
 *      thread (IORING_SETUP_SQPOLL).
 *
 * @uring_cmd:
 *      Check whether the file_operations uring_cmd is allowed to run.
 *
 */
union security_list_options {
	#define LSM_HOOK(RET, DEFAULT, NAME, ...) RET (*NAME)(__VA_ARGS__);
	#include "lsm_hook_defs.h"
	#undef LSM_HOOK
	void *lsm_func_addr;
};

/*
 * @key: static call key as defined by STATIC_CALL_KEY
 * @trampoline: static call trampoline as defined by STATIC_CALL_TRAMP
 * @hl: The security_hook_list as initialized by the owning LSM.
 * @active: Enabled when the static call has an LSM hook associated.
 */
struct lsm_static_call {
	struct static_call_key *key;
	void *trampoline;
	struct security_hook_list *hl;
	/* this needs to be true or false based on what the key defaults to */
	struct static_key_false *active;
} __randomize_layout;

/*
 * Table of the static calls for each LSM hook.
 * Once the LSMs are initialized, their callbacks will be copied to these
 * tables such that the calls are filled backwards (from last to first).
 * This way, we can jump directly to the first used static call, and execute
 * all of them after. This essentially makes the entry point
 * dynamic to adapt the number of static calls to the number of callbacks.
 */
struct lsm_static_calls_table {
	#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
		struct lsm_static_call NAME[MAX_LSM_COUNT];
	#include <linux/lsm_hook_defs.h>
	#undef LSM_HOOK
} __packed __randomize_layout;

/**
 * struct lsm_id - Identify a Linux Security Module.
 * @lsm: name of the LSM, must be approved by the LSM maintainers
 * @id: LSM ID number from uapi/linux/lsm.h
 *
 * Contains the information that identifies the LSM.
 */
struct lsm_id {
	const char *name;
	u64 id;
};

/*
 * Security module hook list structure.
 * For use with generic list macros for common operations.
 *
 * struct security_hook_list - Contents of a cacheable, mappable object.
 * @scalls: The beginning of the array of static calls assigned to this hook.
 * @hook: The callback for the hook.
 * @lsm: The name of the lsm that owns this hook.
 */
struct security_hook_list {
	struct lsm_static_call *scalls;
	union security_list_options hook;
	const struct lsm_id *lsmid;
} __randomize_layout;

/*
 * Security blob size or offset data.
 */
struct lsm_blob_sizes {
	int lbs_cred;
	int lbs_file;
	int lbs_inode;
	int lbs_superblock;
	int lbs_ipc;
	int lbs_msg_msg;
	int lbs_task;
	int lbs_xattr_count; /* number of xattr slots in new_xattrs array */
};

/*
 * LSM_RET_VOID is used as the default value in LSM_HOOK definitions for void
 * LSM hooks (in include/linux/lsm_hook_defs.h).
 */
#define LSM_RET_VOID ((void) 0)

/*
 * Initializing a security_hook_list structure takes
 * up a lot of space in a source file. This macro takes
 * care of the common case and reduces the amount of
 * text involved.
 */
#define LSM_HOOK_INIT(NAME, HOOK)			\
	{						\
		.scalls = static_calls_table.NAME,	\
		.hook = { .NAME = HOOK }		\
	}

extern void security_add_hooks(struct security_hook_list *hooks, int count,
			       const struct lsm_id *lsmid);

#define LSM_FLAG_LEGACY_MAJOR	BIT(0)
#define LSM_FLAG_EXCLUSIVE	BIT(1)

enum lsm_order {
	LSM_ORDER_FIRST = -1,	/* This is only for capabilities. */
	LSM_ORDER_MUTABLE = 0,
};

struct lsm_info {
	const char *name;	/* Required. */
	enum lsm_order order;	/* Optional: default is LSM_ORDER_MUTABLE */
	unsigned long flags;	/* Optional: flags describing LSM */
	int *enabled;		/* Optional: controlled by CONFIG_LSM */
	int (*init)(void);	/* Required. */
	struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */
};

#define DEFINE_LSM(lsm)							\
	static struct lsm_info __lsm_##lsm				\
		__used __section(".lsm_info.init")			\
		__aligned(sizeof(unsigned long))

#define DEFINE_EARLY_LSM(lsm)						\
	static struct lsm_info __early_lsm_##lsm			\
		__used __section(".early_lsm_info.init")		\
		__aligned(sizeof(unsigned long))

/* DO NOT tamper with these variables outside of the LSM framework */
extern char *lsm_names;
extern struct lsm_static_calls_table static_calls_table __ro_after_init;
extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
extern struct lsm_info __start_early_lsm_info[], __end_early_lsm_info[];

/**
 * lsm_get_xattr_slot - Return the next available slot and increment the index
 * @xattrs: array storing LSM-provided xattrs
 * @xattr_count: number of already stored xattrs (updated)
 *
 * Retrieve the first available slot in the @xattrs array to fill with an xattr,
 * and increment @xattr_count.
 *
 * Return: The slot to fill in @xattrs if non-NULL, NULL otherwise.
 */
static inline struct xattr *lsm_get_xattr_slot(struct xattr *xattrs,
					       int *xattr_count)
{
	if (unlikely(!xattrs))
		return NULL;
	return &xattrs[(*xattr_count)++];
}

#endif /* ! __LINUX_LSM_HOOKS_H */
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Name	Type	Permission
amba	Folder	0755
atomic	Folder	0755
avf	Folder	0755
bcma	Folder	0755
byteorder	Folder	0755
can	Folder	0755
ceph	Folder	0755
clk	Folder	0755
crush	Folder	0755
decompress	Folder	0755
device	Folder	0755
dma	Folder	0755
dsa	Folder	0755
extcon	Folder	0755
firmware	Folder	0755
fpga	Folder	0755
fsl	Folder	0755
gpio	Folder	0755
greybus	Folder	0755
hsi	Folder	0755
i3c	Folder	0755
iio	Folder	0755
input	Folder	0755
io_uring	Folder	0755
irqchip	Folder	0755
isdn	Folder	0755
lockd	Folder	0755
mailbox	Folder	0755
mdio	Folder	0755
mfd	Folder	0755
mlx4	Folder	0755
mlx5	Folder	0755
mmc	Folder	0755
mtd	Folder	0755
mux	Folder	0755
net	Folder	0755
netfilter	Folder	0755
netfilter_arp	Folder	0755
netfilter_bridge	Folder	0755
netfilter_ipv4	Folder	0755