1/*
   2 * Linux Security Module interfaces
   3 *
   4 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
   5 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
   6 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
   7 * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
   8 * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
   9 * Copyright (C) 2015 Intel Corporation.
  10 * Copyright (C) 2015 Casey Schaufler <casey@schaufler-ca.com>
  11 * Copyright (C) 2016 Mellanox Techonologies
  12 *
  13 *	This program is free software; you can redistribute it and/or modify
  14 *	it under the terms of the GNU General Public License as published by
  15 *	the Free Software Foundation; either version 2 of the License, or
  16 *	(at your option) any later version.
  17 *
  18 *	Due to this file being licensed under the GPL there is controversy over
  19 *	whether this permits you to write a module that #includes this file
  20 *	without placing your module under the GPL.  Please consult a lawyer for
  21 *	advice before doing this.
  22 *
  23 */
  24
  25#ifndef __LINUX_LSM_HOOKS_H
  26#define __LINUX_LSM_HOOKS_H
  27
 
  28#include <linux/security.h>
  29#include <linux/init.h>
  30#include <linux/rculist.h>
 
  31
  32/**
  33 * union security_list_options - Linux Security Module hook function list
  34 *
  35 * Security hooks for program execution operations.
  36 *
  37 * @bprm_creds_for_exec:
  38 *	If the setup in prepare_exec_creds did not setup @bprm->cred->security
  39 *	properly for executing @bprm->file, update the LSM's portion of
  40 *	@bprm->cred->security to be what commit_creds needs to install for the
  41 *	new program.  This hook may also optionally check permissions
  42 *	(e.g. for transitions between security domains).
  43 *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
  44 *	request libc enable secure mode.
  45 *	@bprm contains the linux_binprm structure.
  46 *	Return 0 if the hook is successful and permission is granted.
  47 * @bprm_creds_from_file:
  48 *	If @file is setpcap, suid, sgid or otherwise marked to change
  49 *	privilege upon exec, update @bprm->cred to reflect that change.
  50 *	This is called after finding the binary that will be executed.
  51 *	without an interpreter.  This ensures that the credentials will not
  52 *	be derived from a script that the binary will need to reopen, which
  53 *	when reopend may end up being a completely different file.  This
  54 *	hook may also optionally check permissions (e.g. for transitions
  55 *	between security domains).
  56 *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
  57 *	request libc enable secure mode.
  58 *	The hook must add to @bprm->per_clear any personality flags that
  59 * 	should be cleared from current->personality.
  60 *	@bprm contains the linux_binprm structure.
  61 *	Return 0 if the hook is successful and permission is granted.
  62 * @bprm_check_security:
  63 *	This hook mediates the point when a search for a binary handler will
  64 *	begin.  It allows a check against the @bprm->cred->security value
  65 *	which was set in the preceding creds_for_exec call.  The argv list and
  66 *	envp list are reliably available in @bprm.  This hook may be called
  67 *	multiple times during a single execve.
  68 *	@bprm contains the linux_binprm structure.
  69 *	Return 0 if the hook is successful and permission is granted.
  70 * @bprm_committing_creds:
  71 *	Prepare to install the new security attributes of a process being
  72 *	transformed by an execve operation, based on the old credentials
  73 *	pointed to by @current->cred and the information set in @bprm->cred by
  74 *	the bprm_creds_for_exec hook.  @bprm points to the linux_binprm
  75 *	structure.  This hook is a good place to perform state changes on the
  76 *	process such as closing open file descriptors to which access will no
  77 *	longer be granted when the attributes are changed.  This is called
  78 *	immediately before commit_creds().
  79 * @bprm_committed_creds:
  80 *	Tidy up after the installation of the new security attributes of a
  81 *	process being transformed by an execve operation.  The new credentials
  82 *	have, by this point, been set to @current->cred.  @bprm points to the
  83 *	linux_binprm structure.  This hook is a good place to perform state
  84 *	changes on the process such as clearing out non-inheritable signal
  85 *	state.  This is called immediately after commit_creds().
  86 *
  87 * Security hooks for mount using fs_context.
  88 *	[See also Documentation/filesystems/mount_api.rst]
  89 *
  90 * @fs_context_dup:
  91 *	Allocate and attach a security structure to sc->security.  This pointer
  92 *	is initialised to NULL by the caller.
  93 *	@fc indicates the new filesystem context.
  94 *	@src_fc indicates the original filesystem context.
  95 * @fs_context_parse_param:
  96 *	Userspace provided a parameter to configure a superblock.  The LSM may
  97 *	reject it with an error and may use it for itself, in which case it
  98 *	should return 0; otherwise it should return -ENOPARAM to pass it on to
  99 *	the filesystem.
 100 *	@fc indicates the filesystem context.
 101 *	@param The parameter
 102 *
 103 * Security hooks for filesystem operations.
 104 *
 105 * @sb_alloc_security:
 106 *	Allocate and attach a security structure to the sb->s_security field.
 107 *	The s_security field is initialized to NULL when the structure is
 108 *	allocated.
 109 *	@sb contains the super_block structure to be modified.
 110 *	Return 0 if operation was successful.
 111 * @sb_delete:
 112 *	Release objects tied to a superblock (e.g. inodes).
 113 *	@sb contains the super_block structure being released.
 114 * @sb_free_security:
 115 *	Deallocate and clear the sb->s_security field.
 116 *	@sb contains the super_block structure to be modified.
 117 * @sb_free_mnt_opts:
 118 * 	Free memory associated with @mnt_ops.
 119 * @sb_eat_lsm_opts:
 120 * 	Eat (scan @orig options) and save them in @mnt_opts.
 121 * @sb_statfs:
 122 *	Check permission before obtaining filesystem statistics for the @mnt
 123 *	mountpoint.
 124 *	@dentry is a handle on the superblock for the filesystem.
 125 *	Return 0 if permission is granted.
 126 * @sb_mount:
 127 *	Check permission before an object specified by @dev_name is mounted on
 128 *	the mount point named by @nd.  For an ordinary mount, @dev_name
 129 *	identifies a device if the file system type requires a device.  For a
 130 *	remount (@flags & MS_REMOUNT), @dev_name is irrelevant.  For a
 131 *	loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
 132 *	pathname of the object being mounted.
 133 *	@dev_name contains the name for object being mounted.
 134 *	@path contains the path for mount point object.
 135 *	@type contains the filesystem type.
 136 *	@flags contains the mount flags.
 137 *	@data contains the filesystem-specific data.
 138 *	Return 0 if permission is granted.
 139 * @sb_copy_data:
 140 *	Allow mount option data to be copied prior to parsing by the filesystem,
 141 *	so that the security module can extract security-specific mount
 142 *	options cleanly (a filesystem may modify the data e.g. with strsep()).
 143 *	This also allows the original mount data to be stripped of security-
 144 *	specific options to avoid having to make filesystems aware of them.
 145 *	@orig the original mount data copied from userspace.
 146 *	@copy copied data which will be passed to the security module.
 147 *	Returns 0 if the copy was successful.
 148 * @sb_mnt_opts_compat:
 149 *	Determine if the new mount options in @mnt_opts are allowed given
 150 *	the existing mounted filesystem at @sb.
 151 *	@sb superblock being compared
 152 *	@mnt_opts new mount options
 153 *	Return 0 if options are compatible.
 154 * @sb_remount:
 155 *	Extracts security system specific mount options and verifies no changes
 156 *	are being made to those options.
 157 *	@sb superblock being remounted
 158 *	@data contains the filesystem-specific data.
 159 *	Return 0 if permission is granted.
 160 * @sb_kern_mount:
 161 * 	Mount this @sb if allowed by permissions.
 162 * @sb_show_options:
 163 * 	Show (print on @m) mount options for this @sb.
 164 * @sb_umount:
 165 *	Check permission before the @mnt file system is unmounted.
 166 *	@mnt contains the mounted file system.
 167 *	@flags contains the unmount flags, e.g. MNT_FORCE.
 168 *	Return 0 if permission is granted.
 169 * @sb_pivotroot:
 170 *	Check permission before pivoting the root filesystem.
 171 *	@old_path contains the path for the new location of the
 172 *	current root (put_old).
 173 *	@new_path contains the path for the new root (new_root).
 174 *	Return 0 if permission is granted.
 175 * @sb_set_mnt_opts:
 176 *	Set the security relevant mount options used for a superblock
 177 *	@sb the superblock to set security mount options for
 178 *	@opts binary data structure containing all lsm mount data
 179 * @sb_clone_mnt_opts:
 180 *	Copy all security options from a given superblock to another
 181 *	@oldsb old superblock which contain information to clone
 182 *	@newsb new superblock which needs filled in
 183 * @sb_add_mnt_opt:
 184 * 	Add one mount @option to @mnt_opts.
 185 * @sb_parse_opts_str:
 186 *	Parse a string of security data filling in the opts structure
 187 *	@options string containing all mount options known by the LSM
 188 *	@opts binary data structure usable by the LSM
 189 * @move_mount:
 190 *	Check permission before a mount is moved.
 191 *	@from_path indicates the mount that is going to be moved.
 192 *	@to_path indicates the mountpoint that will be mounted upon.
 193 * @dentry_init_security:
 194 *	Compute a context for a dentry as the inode is not yet available
 195 *	since NFSv4 has no label backed by an EA anyway.
 196 *	@dentry dentry to use in calculating the context.
 197 *	@mode mode used to determine resource type.
 198 *	@name name of the last path component used to create file
 199 *	@ctx pointer to place the pointer to the resulting context in.
 200 *	@ctxlen point to place the length of the resulting context.
 201 * @dentry_create_files_as:
 202 *	Compute a context for a dentry as the inode is not yet available
 203 *	and set that context in passed in creds so that new files are
 204 *	created using that context. Context is calculated using the
 205 *	passed in creds and not the creds of the caller.
 206 *	@dentry dentry to use in calculating the context.
 207 *	@mode mode used to determine resource type.
 208 *	@name name of the last path component used to create file
 209 *	@old creds which should be used for context calculation
 210 *	@new creds to modify
 211 *
 212 *
 213 * Security hooks for inode operations.
 214 *
 215 * @inode_alloc_security:
 216 *	Allocate and attach a security structure to @inode->i_security.  The
 217 *	i_security field is initialized to NULL when the inode structure is
 218 *	allocated.
 219 *	@inode contains the inode structure.
 220 *	Return 0 if operation was successful.
 221 * @inode_free_security:
 222 *	@inode contains the inode structure.
 223 *	Deallocate the inode security structure and set @inode->i_security to
 224 *	NULL.
 225 * @inode_init_security:
 226 *	Obtain the security attribute name suffix and value to set on a newly
 227 *	created inode and set up the incore security field for the new inode.
 228 *	This hook is called by the fs code as part of the inode creation
 229 *	transaction and provides for atomic labeling of the inode, unlike
 230 *	the post_create/mkdir/... hooks called by the VFS.  The hook function
 231 *	is expected to allocate the name and value via kmalloc, with the caller
 232 *	being responsible for calling kfree after using them.
 233 *	If the security module does not use security attributes or does
 234 *	not wish to put a security attribute on this particular inode,
 235 *	then it should return -EOPNOTSUPP to skip this processing.
 236 *	@inode contains the inode structure of the newly created inode.
 237 *	@dir contains the inode structure of the parent directory.
 238 *	@qstr contains the last path component of the new object
 239 *	@name will be set to the allocated name suffix (e.g. selinux).
 240 *	@value will be set to the allocated attribute value.
 241 *	@len will be set to the length of the value.
 242 *	Returns 0 if @name and @value have been successfully set,
 243 *	-EOPNOTSUPP if no security attribute is needed, or
 244 *	-ENOMEM on memory allocation failure.
 245 * @inode_init_security_anon:
 246 *      Set up the incore security field for the new anonymous inode
 247 *      and return whether the inode creation is permitted by the security
 248 *      module or not.
 249 *      @inode contains the inode structure
 250 *      @name name of the anonymous inode class
 251 *      @context_inode optional related inode
 252 *	Returns 0 on success, -EACCES if the security module denies the
 253 *	creation of this inode, or another -errno upon other errors.
 254 * @inode_create:
 255 *	Check permission to create a regular file.
 256 *	@dir contains inode structure of the parent of the new file.
 257 *	@dentry contains the dentry structure for the file to be created.
 258 *	@mode contains the file mode of the file to be created.
 259 *	Return 0 if permission is granted.
 260 * @inode_link:
 261 *	Check permission before creating a new hard link to a file.
 262 *	@old_dentry contains the dentry structure for an existing
 263 *	link to the file.
 264 *	@dir contains the inode structure of the parent directory
 265 *	of the new link.
 266 *	@new_dentry contains the dentry structure for the new link.
 267 *	Return 0 if permission is granted.
 268 * @path_link:
 269 *	Check permission before creating a new hard link to a file.
 270 *	@old_dentry contains the dentry structure for an existing link
 271 *	to the file.
 272 *	@new_dir contains the path structure of the parent directory of
 273 *	the new link.
 274 *	@new_dentry contains the dentry structure for the new link.
 275 *	Return 0 if permission is granted.
 276 * @inode_unlink:
 277 *	Check the permission to remove a hard link to a file.
 278 *	@dir contains the inode structure of parent directory of the file.
 279 *	@dentry contains the dentry structure for file to be unlinked.
 280 *	Return 0 if permission is granted.
 281 * @path_unlink:
 282 *	Check the permission to remove a hard link to a file.
 283 *	@dir contains the path structure of parent directory of the file.
 284 *	@dentry contains the dentry structure for file to be unlinked.
 285 *	Return 0 if permission is granted.
 286 * @inode_symlink:
 287 *	Check the permission to create a symbolic link to a file.
 288 *	@dir contains the inode structure of parent directory of
 289 *	the symbolic link.
 290 *	@dentry contains the dentry structure of the symbolic link.
 291 *	@old_name contains the pathname of file.
 292 *	Return 0 if permission is granted.
 293 * @path_symlink:
 294 *	Check the permission to create a symbolic link to a file.
 295 *	@dir contains the path structure of parent directory of
 296 *	the symbolic link.
 297 *	@dentry contains the dentry structure of the symbolic link.
 298 *	@old_name contains the pathname of file.
 299 *	Return 0 if permission is granted.
 300 * @inode_mkdir:
 301 *	Check permissions to create a new directory in the existing directory
 302 *	associated with inode structure @dir.
 303 *	@dir contains the inode structure of parent of the directory
 304 *	to be created.
 305 *	@dentry contains the dentry structure of new directory.
 306 *	@mode contains the mode of new directory.
 307 *	Return 0 if permission is granted.
 308 * @path_mkdir:
 309 *	Check permissions to create a new directory in the existing directory
 310 *	associated with path structure @path.
 311 *	@dir contains the path structure of parent of the directory
 312 *	to be created.
 313 *	@dentry contains the dentry structure of new directory.
 314 *	@mode contains the mode of new directory.
 315 *	Return 0 if permission is granted.
 316 * @inode_rmdir:
 317 *	Check the permission to remove a directory.
 318 *	@dir contains the inode structure of parent of the directory
 319 *	to be removed.
 320 *	@dentry contains the dentry structure of directory to be removed.
 321 *	Return 0 if permission is granted.
 322 * @path_rmdir:
 323 *	Check the permission to remove a directory.
 324 *	@dir contains the path structure of parent of the directory to be
 325 *	removed.
 326 *	@dentry contains the dentry structure of directory to be removed.
 327 *	Return 0 if permission is granted.
 328 * @inode_mknod:
 329 *	Check permissions when creating a special file (or a socket or a fifo
 330 *	file created via the mknod system call).  Note that if mknod operation
 331 *	is being done for a regular file, then the create hook will be called
 332 *	and not this hook.
 333 *	@dir contains the inode structure of parent of the new file.
 334 *	@dentry contains the dentry structure of the new file.
 335 *	@mode contains the mode of the new file.
 336 *	@dev contains the device number.
 337 *	Return 0 if permission is granted.
 338 * @path_mknod:
 339 *	Check permissions when creating a file. Note that this hook is called
 340 *	even if mknod operation is being done for a regular file.
 341 *	@dir contains the path structure of parent of the new file.
 342 *	@dentry contains the dentry structure of the new file.
 343 *	@mode contains the mode of the new file.
 344 *	@dev contains the undecoded device number. Use new_decode_dev() to get
 345 *	the decoded device number.
 346 *	Return 0 if permission is granted.
 347 * @inode_rename:
 348 *	Check for permission to rename a file or directory.
 349 *	@old_dir contains the inode structure for parent of the old link.
 350 *	@old_dentry contains the dentry structure of the old link.
 351 *	@new_dir contains the inode structure for parent of the new link.
 352 *	@new_dentry contains the dentry structure of the new link.
 353 *	Return 0 if permission is granted.
 354 * @path_rename:
 355 *	Check for permission to rename a file or directory.
 356 *	@old_dir contains the path structure for parent of the old link.
 357 *	@old_dentry contains the dentry structure of the old link.
 358 *	@new_dir contains the path structure for parent of the new link.
 359 *	@new_dentry contains the dentry structure of the new link.
 360 *	Return 0 if permission is granted.
 361 * @path_chmod:
 362 *	Check for permission to change a mode of the file @path. The new
 363 *	mode is specified in @mode.
 364 *	@path contains the path structure of the file to change the mode.
 365 *	@mode contains the new DAC's permission, which is a bitmask of
 366 *	constants from <include/uapi/linux/stat.h>
 367 *	Return 0 if permission is granted.
 368 * @path_chown:
 369 *	Check for permission to change owner/group of a file or directory.
 370 *	@path contains the path structure.
 371 *	@uid contains new owner's ID.
 372 *	@gid contains new group's ID.
 373 *	Return 0 if permission is granted.
 374 * @path_chroot:
 375 *	Check for permission to change root directory.
 376 *	@path contains the path structure.
 377 *	Return 0 if permission is granted.
 378 * @path_notify:
 379 *	Check permissions before setting a watch on events as defined by @mask,
 380 *	on an object at @path, whose type is defined by @obj_type.
 381 * @inode_readlink:
 382 *	Check the permission to read the symbolic link.
 383 *	@dentry contains the dentry structure for the file link.
 384 *	Return 0 if permission is granted.
 385 * @inode_follow_link:
 386 *	Check permission to follow a symbolic link when looking up a pathname.
 387 *	@dentry contains the dentry structure for the link.
 388 *	@inode contains the inode, which itself is not stable in RCU-walk
 389 *	@rcu indicates whether we are in RCU-walk mode.
 390 *	Return 0 if permission is granted.
 391 * @inode_permission:
 392 *	Check permission before accessing an inode.  This hook is called by the
 393 *	existing Linux permission function, so a security module can use it to
 394 *	provide additional checking for existing Linux permission checks.
 395 *	Notice that this hook is called when a file is opened (as well as many
 396 *	other operations), whereas the file_security_ops permission hook is
 397 *	called when the actual read/write operations are performed.
 398 *	@inode contains the inode structure to check.
 399 *	@mask contains the permission mask.
 400 *	Return 0 if permission is granted.
 401 * @inode_setattr:
 402 *	Check permission before setting file attributes.  Note that the kernel
 403 *	call to notify_change is performed from several locations, whenever
 404 *	file attributes change (such as when a file is truncated, chown/chmod
 405 *	operations, transferring disk quotas, etc).
 406 *	@dentry contains the dentry structure for the file.
 407 *	@attr is the iattr structure containing the new file attributes.
 408 *	Return 0 if permission is granted.
 409 * @path_truncate:
 410 *	Check permission before truncating a file.
 411 *	@path contains the path structure for the file.
 412 *	Return 0 if permission is granted.
 413 * @inode_getattr:
 414 *	Check permission before obtaining file attributes.
 415 *	@path contains the path structure for the file.
 416 *	Return 0 if permission is granted.
 417 * @inode_setxattr:
 418 *	Check permission before setting the extended attributes
 419 *	@value identified by @name for @dentry.
 420 *	Return 0 if permission is granted.
 421 * @inode_post_setxattr:
 422 *	Update inode security field after successful setxattr operation.
 423 *	@value identified by @name for @dentry.
 424 * @inode_getxattr:
 425 *	Check permission before obtaining the extended attributes
 426 *	identified by @name for @dentry.
 427 *	Return 0 if permission is granted.
 428 * @inode_listxattr:
 429 *	Check permission before obtaining the list of extended attribute
 430 *	names for @dentry.
 431 *	Return 0 if permission is granted.
 432 * @inode_removexattr:
 433 *	Check permission before removing the extended attribute
 434 *	identified by @name for @dentry.
 435 *	Return 0 if permission is granted.
 436 * @inode_getsecurity:
 437 *	Retrieve a copy of the extended attribute representation of the
 438 *	security label associated with @name for @inode via @buffer.  Note that
 439 *	@name is the remainder of the attribute name after the security prefix
 440 *	has been removed. @alloc is used to specify of the call should return a
 441 *	value via the buffer or just the value length Return size of buffer on
 442 *	success.
 443 * @inode_setsecurity:
 444 *	Set the security label associated with @name for @inode from the
 445 *	extended attribute value @value.  @size indicates the size of the
 446 *	@value in bytes.  @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
 447 *	Note that @name is the remainder of the attribute name after the
 448 *	security. prefix has been removed.
 449 *	Return 0 on success.
 450 * @inode_listsecurity:
 451 *	Copy the extended attribute names for the security labels
 452 *	associated with @inode into @buffer.  The maximum size of @buffer
 453 *	is specified by @buffer_size.  @buffer may be NULL to request
 454 *	the size of the buffer required.
 455 *	Returns number of bytes used/required on success.
 456 * @inode_need_killpriv:
 457 *	Called when an inode has been changed.
 458 *	@dentry is the dentry being changed.
 459 *	Return <0 on error to abort the inode change operation.
 460 *	Return 0 if inode_killpriv does not need to be called.
 461 *	Return >0 if inode_killpriv does need to be called.
 462 * @inode_killpriv:
 463 *	The setuid bit is being removed.  Remove similar security labels.
 464 *	Called with the dentry->d_inode->i_mutex held.
 465 *	@mnt_userns: user namespace of the mount
 466 *	@dentry is the dentry being changed.
 467 *	Return 0 on success.  If error is returned, then the operation
 468 *	causing setuid bit removal is failed.
 469 * @inode_getsecid:
 470 *	Get the secid associated with the node.
 471 *	@inode contains a pointer to the inode.
 472 *	@secid contains a pointer to the location where result will be saved.
 473 *	In case of failure, @secid will be set to zero.
 474 * @inode_copy_up:
 475 *	A file is about to be copied up from lower layer to upper layer of
 476 *	overlay filesystem. Security module can prepare a set of new creds
 477 *	and modify as need be and return new creds. Caller will switch to
 478 *	new creds temporarily to create new file and release newly allocated
 479 *	creds.
 480 *	@src indicates the union dentry of file that is being copied up.
 481 *	@new pointer to pointer to return newly allocated creds.
 482 *	Returns 0 on success or a negative error code on error.
 483 * @inode_copy_up_xattr:
 484 *	Filter the xattrs being copied up when a unioned file is copied
 485 *	up from a lower layer to the union/overlay layer.
 486 *	@name indicates the name of the xattr.
 487 *	Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP if
 488 *	security module does not know about attribute or a negative error code
 489 *	to abort the copy up. Note that the caller is responsible for reading
 490 *	and writing the xattrs as this hook is merely a filter.
 491 * @d_instantiate:
 492 * 	Fill in @inode security information for a @dentry if allowed.
 493 * @getprocattr:
 494 * 	Read attribute @name for process @p and store it into @value if allowed.
 495 * @setprocattr:
 496 * 	Write (set) attribute @name to @value, size @size if allowed.
 497 *
 498 * Security hooks for kernfs node operations
 499 *
 500 * @kernfs_init_security:
 501 *	Initialize the security context of a newly created kernfs node based
 502 *	on its own and its parent's attributes.
 503 *
 504 *	@kn_dir the parent kernfs node
 505 *	@kn the new child kernfs node
 506 *
 507 * Security hooks for file operations
 508 *
 509 * @file_permission:
 510 *	Check file permissions before accessing an open file.  This hook is
 511 *	called by various operations that read or write files.  A security
 512 *	module can use this hook to perform additional checking on these
 513 *	operations, e.g.  to revalidate permissions on use to support privilege
 514 *	bracketing or policy changes.  Notice that this hook is used when the
 515 *	actual read/write operations are performed, whereas the
 516 *	inode_security_ops hook is called when a file is opened (as well as
 517 *	many other operations).
 518 *	Caveat:  Although this hook can be used to revalidate permissions for
 519 *	various system call operations that read or write files, it does not
 520 *	address the revalidation of permissions for memory-mapped files.
 521 *	Security modules must handle this separately if they need such
 522 *	revalidation.
 523 *	@file contains the file structure being accessed.
 524 *	@mask contains the requested permissions.
 525 *	Return 0 if permission is granted.
 526 * @file_alloc_security:
 527 *	Allocate and attach a security structure to the file->f_security field.
 528 *	The security field is initialized to NULL when the structure is first
 529 *	created.
 530 *	@file contains the file structure to secure.
 531 *	Return 0 if the hook is successful and permission is granted.
 532 * @file_free_security:
 533 *	Deallocate and free any security structures stored in file->f_security.
 534 *	@file contains the file structure being modified.
 535 * @file_ioctl:
 536 *	@file contains the file structure.
 537 *	@cmd contains the operation to perform.
 538 *	@arg contains the operational arguments.
 539 *	Check permission for an ioctl operation on @file.  Note that @arg
 540 *	sometimes represents a user space pointer; in other cases, it may be a
 541 *	simple integer value.  When @arg represents a user space pointer, it
 542 *	should never be used by the security module.
 543 *	Return 0 if permission is granted.
 544 * @mmap_addr :
 545 *	Check permissions for a mmap operation at @addr.
 546 *	@addr contains virtual address that will be used for the operation.
 547 *	Return 0 if permission is granted.
 548 * @mmap_file :
 549 *	Check permissions for a mmap operation.  The @file may be NULL, e.g.
 550 *	if mapping anonymous memory.
 551 *	@file contains the file structure for file to map (may be NULL).
 552 *	@reqprot contains the protection requested by the application.
 553 *	@prot contains the protection that will be applied by the kernel.
 554 *	@flags contains the operational flags.
 555 *	Return 0 if permission is granted.
 556 * @file_mprotect:
 557 *	Check permissions before changing memory access permissions.
 558 *	@vma contains the memory region to modify.
 559 *	@reqprot contains the protection requested by the application.
 560 *	@prot contains the protection that will be applied by the kernel.
 561 *	Return 0 if permission is granted.
 562 * @file_lock:
 563 *	Check permission before performing file locking operations.
 564 *	Note the hook mediates both flock and fcntl style locks.
 565 *	@file contains the file structure.
 566 *	@cmd contains the posix-translated lock operation to perform
 567 *	(e.g. F_RDLCK, F_WRLCK).
 568 *	Return 0 if permission is granted.
 569 * @file_fcntl:
 570 *	Check permission before allowing the file operation specified by @cmd
 571 *	from being performed on the file @file.  Note that @arg sometimes
 572 *	represents a user space pointer; in other cases, it may be a simple
 573 *	integer value.  When @arg represents a user space pointer, it should
 574 *	never be used by the security module.
 575 *	@file contains the file structure.
 576 *	@cmd contains the operation to be performed.
 577 *	@arg contains the operational arguments.
 578 *	Return 0 if permission is granted.
 579 * @file_set_fowner:
 580 *	Save owner security information (typically from current->security) in
 581 *	file->f_security for later use by the send_sigiotask hook.
 582 *	@file contains the file structure to update.
 583 *	Return 0 on success.
 584 * @file_send_sigiotask:
 585 *	Check permission for the file owner @fown to send SIGIO or SIGURG to the
 586 *	process @tsk.  Note that this hook is sometimes called from interrupt.
 587 *	Note that the fown_struct, @fown, is never outside the context of a
 588 *	struct file, so the file structure (and associated security information)
 589 *	can always be obtained: container_of(fown, struct file, f_owner)
 590 *	@tsk contains the structure of task receiving signal.
 591 *	@fown contains the file owner information.
 592 *	@sig is the signal that will be sent.  When 0, kernel sends SIGIO.
 593 *	Return 0 if permission is granted.
 594 * @file_receive:
 595 *	This hook allows security modules to control the ability of a process
 596 *	to receive an open file descriptor via socket IPC.
 597 *	@file contains the file structure being received.
 598 *	Return 0 if permission is granted.
 599 * @file_open:
 600 *	Save open-time permission checking state for later use upon
 601 *	file_permission, and recheck access if anything has changed
 602 *	since inode_permission.
 603 *
 604 * Security hooks for task operations.
 605 *
 606 * @task_alloc:
 607 *	@task task being allocated.
 608 *	@clone_flags contains the flags indicating what should be shared.
 609 *	Handle allocation of task-related resources.
 610 *	Returns a zero on success, negative values on failure.
 611 * @task_free:
 612 *	@task task about to be freed.
 613 *	Handle release of task-related resources. (Note that this can be called
 614 *	from interrupt context.)
 615 * @cred_alloc_blank:
 616 *	@cred points to the credentials.
 617 *	@gfp indicates the atomicity of any memory allocations.
 618 *	Only allocate sufficient memory and attach to @cred such that
 619 *	cred_transfer() will not get ENOMEM.
 620 * @cred_free:
 621 *	@cred points to the credentials.
 622 *	Deallocate and clear the cred->security field in a set of credentials.
 623 * @cred_prepare:
 624 *	@new points to the new credentials.
 625 *	@old points to the original credentials.
 626 *	@gfp indicates the atomicity of any memory allocations.
 627 *	Prepare a new set of credentials by copying the data from the old set.
 628 * @cred_transfer:
 629 *	@new points to the new credentials.
 630 *	@old points to the original credentials.
 631 *	Transfer data from original creds to new creds
 632 * @cred_getsecid:
 633 *	Retrieve the security identifier of the cred structure @c
 634 *	@c contains the credentials, secid will be placed into @secid.
 635 *	In case of failure, @secid will be set to zero.
 636 * @kernel_act_as:
 637 *	Set the credentials for a kernel service to act as (subjective context).
 638 *	@new points to the credentials to be modified.
 639 *	@secid specifies the security ID to be set
 640 *	The current task must be the one that nominated @secid.
 641 *	Return 0 if successful.
 642 * @kernel_create_files_as:
 643 *	Set the file creation context in a set of credentials to be the same as
 644 *	the objective context of the specified inode.
 645 *	@new points to the credentials to be modified.
 646 *	@inode points to the inode to use as a reference.
 647 *	The current task must be the one that nominated @inode.
 648 *	Return 0 if successful.
 649 * @kernel_module_request:
 650 *	Ability to trigger the kernel to automatically upcall to userspace for
 651 *	userspace to load a kernel module with the given name.
 652 *	@kmod_name name of the module requested by the kernel
 653 *	Return 0 if successful.
 654 * @kernel_load_data:
 655 *	Load data provided by userspace.
 656 *	@id kernel load data identifier
 657 *	@contents if a subsequent @kernel_post_load_data will be called.
 658 *	Return 0 if permission is granted.
 659 * @kernel_post_load_data:
 660 *	Load data provided by a non-file source (usually userspace buffer).
 661 *	@buf pointer to buffer containing the data contents.
 662 *	@size length of the data contents.
 663 *	@id kernel load data identifier
 664 *	@description a text description of what was loaded, @id-specific
 665 *	Return 0 if permission is granted.
 666 *	This must be paired with a prior @kernel_load_data call that had
 667 *	@contents set to true.
 668 * @kernel_read_file:
 669 *	Read a file specified by userspace.
 670 *	@file contains the file structure pointing to the file being read
 671 *	by the kernel.
 672 *	@id kernel read file identifier
 673 *	@contents if a subsequent @kernel_post_read_file will be called.
 674 *	Return 0 if permission is granted.
 675 * @kernel_post_read_file:
 676 *	Read a file specified by userspace.
 677 *	@file contains the file structure pointing to the file being read
 678 *	by the kernel.
 679 *	@buf pointer to buffer containing the file contents.
 680 *	@size length of the file contents.
 681 *	@id kernel read file identifier
 682 *	This must be paired with a prior @kernel_read_file call that had
 683 *	@contents set to true.
 684 *	Return 0 if permission is granted.
 685 * @task_fix_setuid:
 686 *	Update the module's state after setting one or more of the user
 687 *	identity attributes of the current process.  The @flags parameter
 688 *	indicates which of the set*uid system calls invoked this hook.  If
 689 *	@new is the set of credentials that will be installed.  Modifications
 690 *	should be made to this rather than to @current->cred.
 691 *	@old is the set of credentials that are being replaces
 692 *	@flags contains one of the LSM_SETID_* values.
 693 *	Return 0 on success.
 694 * @task_fix_setgid:
 695 *	Update the module's state after setting one or more of the group
 696 *	identity attributes of the current process.  The @flags parameter
 697 *	indicates which of the set*gid system calls invoked this hook.
 698 *	@new is the set of credentials that will be installed.  Modifications
 699 *	should be made to this rather than to @current->cred.
 700 *	@old is the set of credentials that are being replaced.
 701 *	@flags contains one of the LSM_SETID_* values.
 702 *	Return 0 on success.
 703 * @task_setpgid:
 704 *	Check permission before setting the process group identifier of the
 705 *	process @p to @pgid.
 706 *	@p contains the task_struct for process being modified.
 707 *	@pgid contains the new pgid.
 708 *	Return 0 if permission is granted.
 709 * @task_getpgid:
 710 *	Check permission before getting the process group identifier of the
 711 *	process @p.
 712 *	@p contains the task_struct for the process.
 713 *	Return 0 if permission is granted.
 714 * @task_getsid:
 715 *	Check permission before getting the session identifier of the process
 716 *	@p.
 717 *	@p contains the task_struct for the process.
 718 *	Return 0 if permission is granted.
 719 * @task_getsecid_subj:
 720 *	Retrieve the subjective security identifier of the task_struct in @p
 721 *	and return it in @secid.  Special care must be taken to ensure that @p
 722 *	is the either the "current" task, or the caller has exclusive access
 723 *	to @p.
 724 *	In case of failure, @secid will be set to zero.
 725 * @task_getsecid_obj:
 726 *	Retrieve the objective security identifier of the task_struct in @p
 727 *	and return it in @secid.
 728 *	In case of failure, @secid will be set to zero.
 729 *
 730 * @task_setnice:
 731 *	Check permission before setting the nice value of @p to @nice.
 732 *	@p contains the task_struct of process.
 733 *	@nice contains the new nice value.
 734 *	Return 0 if permission is granted.
 735 * @task_setioprio:
 736 *	Check permission before setting the ioprio value of @p to @ioprio.
 737 *	@p contains the task_struct of process.
 738 *	@ioprio contains the new ioprio value
 739 *	Return 0 if permission is granted.
 740 * @task_getioprio:
 741 *	Check permission before getting the ioprio value of @p.
 742 *	@p contains the task_struct of process.
 743 *	Return 0 if permission is granted.
 744 * @task_prlimit:
 745 *	Check permission before getting and/or setting the resource limits of
 746 *	another task.
 747 *	@cred points to the cred structure for the current task.
 748 *	@tcred points to the cred structure for the target task.
 749 *	@flags contains the LSM_PRLIMIT_* flag bits indicating whether the
 750 *	resource limits are being read, modified, or both.
 751 *	Return 0 if permission is granted.
 752 * @task_setrlimit:
 753 *	Check permission before setting the resource limits of process @p
 754 *	for @resource to @new_rlim.  The old resource limit values can
 755 *	be examined by dereferencing (p->signal->rlim + resource).
 756 *	@p points to the task_struct for the target task's group leader.
 757 *	@resource contains the resource whose limit is being set.
 758 *	@new_rlim contains the new limits for @resource.
 759 *	Return 0 if permission is granted.
 760 * @task_setscheduler:
 761 *	Check permission before setting scheduling policy and/or parameters of
 762 *	process @p.
 763 *	@p contains the task_struct for process.
 764 *	Return 0 if permission is granted.
 765 * @task_getscheduler:
 766 *	Check permission before obtaining scheduling information for process
 767 *	@p.
 768 *	@p contains the task_struct for process.
 769 *	Return 0 if permission is granted.
 770 * @task_movememory:
 771 *	Check permission before moving memory owned by process @p.
 772 *	@p contains the task_struct for process.
 773 *	Return 0 if permission is granted.
 774 * @task_kill:
 775 *	Check permission before sending signal @sig to @p.  @info can be NULL,
 776 *	the constant 1, or a pointer to a kernel_siginfo structure.  If @info is 1 or
 777 *	SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
 778 *	from the kernel and should typically be permitted.
 779 *	SIGIO signals are handled separately by the send_sigiotask hook in
 780 *	file_security_ops.
 781 *	@p contains the task_struct for process.
 782 *	@info contains the signal information.
 783 *	@sig contains the signal value.
 784 *	@cred contains the cred of the process where the signal originated, or
 785 *	NULL if the current task is the originator.
 786 *	Return 0 if permission is granted.
 787 * @task_prctl:
 788 *	Check permission before performing a process control operation on the
 789 *	current process.
 790 *	@option contains the operation.
 791 *	@arg2 contains a argument.
 792 *	@arg3 contains a argument.
 793 *	@arg4 contains a argument.
 794 *	@arg5 contains a argument.
 795 *	Return -ENOSYS if no-one wanted to handle this op, any other value to
 796 *	cause prctl() to return immediately with that value.
 797 * @task_to_inode:
 798 *	Set the security attributes for an inode based on an associated task's
 799 *	security attributes, e.g. for /proc/pid inodes.
 800 *	@p contains the task_struct for the task.
 801 *	@inode contains the inode structure for the inode.
 802 *
 803 * Security hooks for Netlink messaging.
 804 *
 805 * @netlink_send:
 806 *	Save security information for a netlink message so that permission
 807 *	checking can be performed when the message is processed.  The security
 808 *	information can be saved using the eff_cap field of the
 809 *	netlink_skb_parms structure.  Also may be used to provide fine
 810 *	grained control over message transmission.
 811 *	@sk associated sock of task sending the message.
 812 *	@skb contains the sk_buff structure for the netlink message.
 813 *	Return 0 if the information was successfully saved and message
 814 *	is allowed to be transmitted.
 815 *
 816 * Security hooks for Unix domain networking.
 817 *
 818 * @unix_stream_connect:
 819 *	Check permissions before establishing a Unix domain stream connection
 820 *	between @sock and @other.
 821 *	@sock contains the sock structure.
 822 *	@other contains the peer sock structure.
 823 *	@newsk contains the new sock structure.
 824 *	Return 0 if permission is granted.
 825 * @unix_may_send:
 826 *	Check permissions before connecting or sending datagrams from @sock to
 827 *	@other.
 828 *	@sock contains the socket structure.
 829 *	@other contains the peer socket structure.
 830 *	Return 0 if permission is granted.
 831 *
 832 * The @unix_stream_connect and @unix_may_send hooks were necessary because
 833 * Linux provides an alternative to the conventional file name space for Unix
 834 * domain sockets.  Whereas binding and connecting to sockets in the file name
 835 * space is mediated by the typical file permissions (and caught by the mknod
 836 * and permission hooks in inode_security_ops), binding and connecting to
 837 * sockets in the abstract name space is completely unmediated.  Sufficient
 838 * control of Unix domain sockets in the abstract name space isn't possible
 839 * using only the socket layer hooks, since we need to know the actual target
 840 * socket, which is not looked up until we are inside the af_unix code.
 841 *
 842 * Security hooks for socket operations.
 843 *
 844 * @socket_create:
 845 *	Check permissions prior to creating a new socket.
 846 *	@family contains the requested protocol family.
 847 *	@type contains the requested communications type.
 848 *	@protocol contains the requested protocol.
 849 *	@kern set to 1 if a kernel socket.
 850 *	Return 0 if permission is granted.
 851 * @socket_post_create:
 852 *	This hook allows a module to update or allocate a per-socket security
 853 *	structure. Note that the security field was not added directly to the
 854 *	socket structure, but rather, the socket security information is stored
 855 *	in the associated inode.  Typically, the inode alloc_security hook will
 856 *	allocate and attach security information to
 857 *	SOCK_INODE(sock)->i_security.  This hook may be used to update the
 858 *	SOCK_INODE(sock)->i_security field with additional information that
 859 *	wasn't available when the inode was allocated.
 860 *	@sock contains the newly created socket structure.
 861 *	@family contains the requested protocol family.
 862 *	@type contains the requested communications type.
 863 *	@protocol contains the requested protocol.
 864 *	@kern set to 1 if a kernel socket.
 865 * @socket_socketpair:
 866 *	Check permissions before creating a fresh pair of sockets.
 867 *	@socka contains the first socket structure.
 868 *	@sockb contains the second socket structure.
 869 *	Return 0 if permission is granted and the connection was established.
 870 * @socket_bind:
 871 *	Check permission before socket protocol layer bind operation is
 872 *	performed and the socket @sock is bound to the address specified in the
 873 *	@address parameter.
 874 *	@sock contains the socket structure.
 875 *	@address contains the address to bind to.
 876 *	@addrlen contains the length of address.
 877 *	Return 0 if permission is granted.
 878 * @socket_connect:
 879 *	Check permission before socket protocol layer connect operation
 880 *	attempts to connect socket @sock to a remote address, @address.
 881 *	@sock contains the socket structure.
 882 *	@address contains the address of remote endpoint.
 883 *	@addrlen contains the length of address.
 884 *	Return 0 if permission is granted.
 885 * @socket_listen:
 886 *	Check permission before socket protocol layer listen operation.
 887 *	@sock contains the socket structure.
 888 *	@backlog contains the maximum length for the pending connection queue.
 889 *	Return 0 if permission is granted.
 890 * @socket_accept:
 891 *	Check permission before accepting a new connection.  Note that the new
 892 *	socket, @newsock, has been created and some information copied to it,
 893 *	but the accept operation has not actually been performed.
 894 *	@sock contains the listening socket structure.
 895 *	@newsock contains the newly created server socket for connection.
 896 *	Return 0 if permission is granted.
 897 * @socket_sendmsg:
 898 *	Check permission before transmitting a message to another socket.
 899 *	@sock contains the socket structure.
 900 *	@msg contains the message to be transmitted.
 901 *	@size contains the size of message.
 902 *	Return 0 if permission is granted.
 903 * @socket_recvmsg:
 904 *	Check permission before receiving a message from a socket.
 905 *	@sock contains the socket structure.
 906 *	@msg contains the message structure.
 907 *	@size contains the size of message structure.
 908 *	@flags contains the operational flags.
 909 *	Return 0 if permission is granted.
 910 * @socket_getsockname:
 911 *	Check permission before the local address (name) of the socket object
 912 *	@sock is retrieved.
 913 *	@sock contains the socket structure.
 914 *	Return 0 if permission is granted.
 915 * @socket_getpeername:
 916 *	Check permission before the remote address (name) of a socket object
 917 *	@sock is retrieved.
 918 *	@sock contains the socket structure.
 919 *	Return 0 if permission is granted.
 920 * @socket_getsockopt:
 921 *	Check permissions before retrieving the options associated with socket
 922 *	@sock.
 923 *	@sock contains the socket structure.
 924 *	@level contains the protocol level to retrieve option from.
 925 *	@optname contains the name of option to retrieve.
 926 *	Return 0 if permission is granted.
 927 * @socket_setsockopt:
 928 *	Check permissions before setting the options associated with socket
 929 *	@sock.
 930 *	@sock contains the socket structure.
 931 *	@level contains the protocol level to set options for.
 932 *	@optname contains the name of the option to set.
 933 *	Return 0 if permission is granted.
 934 * @socket_shutdown:
 935 *	Checks permission before all or part of a connection on the socket
 936 *	@sock is shut down.
 937 *	@sock contains the socket structure.
 938 *	@how contains the flag indicating how future sends and receives
 939 *	are handled.
 940 *	Return 0 if permission is granted.
 941 * @socket_sock_rcv_skb:
 942 *	Check permissions on incoming network packets.  This hook is distinct
 943 *	from Netfilter's IP input hooks since it is the first time that the
 944 *	incoming sk_buff @skb has been associated with a particular socket, @sk.
 945 *	Must not sleep inside this hook because some callers hold spinlocks.
 946 *	@sk contains the sock (not socket) associated with the incoming sk_buff.
 947 *	@skb contains the incoming network data.
 948 * @socket_getpeersec_stream:
 949 *	This hook allows the security module to provide peer socket security
 950 *	state for unix or connected tcp sockets to userspace via getsockopt
 951 *	SO_GETPEERSEC.  For tcp sockets this can be meaningful if the
 952 *	socket is associated with an ipsec SA.
 953 *	@sock is the local socket.
 954 *	@optval userspace memory where the security state is to be copied.
 955 *	@optlen userspace int where the module should copy the actual length
 956 *	of the security state.
 957 *	@len as input is the maximum length to copy to userspace provided
 958 *	by the caller.
 959 *	Return 0 if all is well, otherwise, typical getsockopt return
 960 *	values.
 961 * @socket_getpeersec_dgram:
 962 *	This hook allows the security module to provide peer socket security
 963 *	state for udp sockets on a per-packet basis to userspace via
 964 *	getsockopt SO_GETPEERSEC. The application must first have indicated
 965 *	the IP_PASSSEC option via getsockopt. It can then retrieve the
 966 *	security state returned by this hook for a packet via the SCM_SECURITY
 967 *	ancillary message type.
 968 *	@sock contains the peer socket. May be NULL.
 969 *	@skb is the sk_buff for the packet being queried. May be NULL.
 970 *	@secid pointer to store the secid of the packet.
 971 *	Return 0 on success, error on failure.
 972 * @sk_alloc_security:
 973 *	Allocate and attach a security structure to the sk->sk_security field,
 974 *	which is used to copy security attributes between local stream sockets.
 975 * @sk_free_security:
 976 *	Deallocate security structure.
 977 * @sk_clone_security:
 978 *	Clone/copy security structure.
 979 * @sk_getsecid:
 980 *	Retrieve the LSM-specific secid for the sock to enable caching
 981 *	of network authorizations.
 982 * @sock_graft:
 983 *	Sets the socket's isec sid to the sock's sid.
 984 * @inet_conn_request:
 985 *	Sets the openreq's sid to socket's sid with MLS portion taken
 986 *	from peer sid.
 987 * @inet_csk_clone:
 988 *	Sets the new child socket's sid to the openreq sid.
 989 * @inet_conn_established:
 990 *	Sets the connection's peersid to the secmark on skb.
 991 * @secmark_relabel_packet:
 992 *	check if the process should be allowed to relabel packets to
 993 *	the given secid
 994 * @secmark_refcount_inc:
 995 *	tells the LSM to increment the number of secmark labeling rules loaded
 996 * @secmark_refcount_dec:
 997 *	tells the LSM to decrement the number of secmark labeling rules loaded
 998 * @req_classify_flow:
 999 *	Sets the flow's sid to the openreq sid.
1000 * @tun_dev_alloc_security:
1001 *	This hook allows a module to allocate a security structure for a TUN
1002 *	device.
1003 *	@security pointer to a security structure pointer.
1004 *	Returns a zero on success, negative values on failure.
1005 * @tun_dev_free_security:
1006 *	This hook allows a module to free the security structure for a TUN
1007 *	device.
1008 *	@security pointer to the TUN device's security structure
1009 * @tun_dev_create:
1010 *	Check permissions prior to creating a new TUN device.
1011 * @tun_dev_attach_queue:
1012 *	Check permissions prior to attaching to a TUN device queue.
1013 *	@security pointer to the TUN device's security structure.
1014 * @tun_dev_attach:
1015 *	This hook can be used by the module to update any security state
1016 *	associated with the TUN device's sock structure.
1017 *	@sk contains the existing sock structure.
1018 *	@security pointer to the TUN device's security structure.
1019 * @tun_dev_open:
1020 *	This hook can be used by the module to update any security state
1021 *	associated with the TUN device's security structure.
1022 *	@security pointer to the TUN devices's security structure.
1023 *
1024 * Security hooks for SCTP
1025 *
1026 * @sctp_assoc_request:
1027 *	Passes the @ep and @chunk->skb of the association INIT packet to
1028 *	the security module.
1029 *	@ep pointer to sctp endpoint structure.
1030 *	@skb pointer to skbuff of association packet.
1031 *	Return 0 on success, error on failure.
1032 * @sctp_bind_connect:
1033 *	Validiate permissions required for each address associated with sock
1034 *	@sk. Depending on @optname, the addresses will be treated as either
1035 *	for a connect or bind service. The @addrlen is calculated on each
1036 *	ipv4 and ipv6 address using sizeof(struct sockaddr_in) or
1037 *	sizeof(struct sockaddr_in6).
1038 *	@sk pointer to sock structure.
1039 *	@optname name of the option to validate.
1040 *	@address list containing one or more ipv4/ipv6 addresses.
1041 *	@addrlen total length of address(s).
1042 *	Return 0 on success, error on failure.
1043 * @sctp_sk_clone:
1044 *	Called whenever a new socket is created by accept(2) (i.e. a TCP
1045 *	style socket) or when a socket is 'peeled off' e.g userspace
1046 *	calls sctp_peeloff(3).
1047 *	@ep pointer to current sctp endpoint structure.
1048 *	@sk pointer to current sock structure.
1049 *	@sk pointer to new sock structure.
1050 *
1051 * Security hooks for Infiniband
1052 *
1053 * @ib_pkey_access:
1054 *	Check permission to access a pkey when modifing a QP.
1055 *	@subnet_prefix the subnet prefix of the port being used.
1056 *	@pkey the pkey to be accessed.
1057 *	@sec pointer to a security structure.
1058 * @ib_endport_manage_subnet:
1059 *	Check permissions to send and receive SMPs on a end port.
1060 *	@dev_name the IB device name (i.e. mlx4_0).
1061 *	@port_num the port number.
1062 *	@sec pointer to a security structure.
1063 * @ib_alloc_security:
1064 *	Allocate a security structure for Infiniband objects.
1065 *	@sec pointer to a security structure pointer.
1066 *	Returns 0 on success, non-zero on failure
1067 * @ib_free_security:
1068 *	Deallocate an Infiniband security structure.
1069 *	@sec contains the security structure to be freed.
1070 *
1071 * Security hooks for XFRM operations.
1072 *
1073 * @xfrm_policy_alloc_security:
1074 *	@ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1075 *	Database used by the XFRM system.
1076 *	@sec_ctx contains the security context information being provided by
1077 *	the user-level policy update program (e.g., setkey).
1078 *	Allocate a security structure to the xp->security field; the security
1079 *	field is initialized to NULL when the xfrm_policy is allocated.
1080 *	Return 0 if operation was successful (memory to allocate, legal context)
1081 *	@gfp is to specify the context for the allocation
1082 * @xfrm_policy_clone_security:
1083 *	@old_ctx contains an existing xfrm_sec_ctx.
1084 *	@new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1085 *	Allocate a security structure in new_ctxp that contains the
1086 *	information from the old_ctx structure.
1087 *	Return 0 if operation was successful (memory to allocate).
1088 * @xfrm_policy_free_security:
1089 *	@ctx contains the xfrm_sec_ctx
1090 *	Deallocate xp->security.
1091 * @xfrm_policy_delete_security:
1092 *	@ctx contains the xfrm_sec_ctx.
1093 *	Authorize deletion of xp->security.
1094 * @xfrm_state_alloc:
1095 *	@x contains the xfrm_state being added to the Security Association
1096 *	Database by the XFRM system.
1097 *	@sec_ctx contains the security context information being provided by
1098 *	the user-level SA generation program (e.g., setkey or racoon).
1099 *	Allocate a security structure to the x->security field; the security
1100 *	field is initialized to NULL when the xfrm_state is allocated. Set the
1101 *	context to correspond to sec_ctx. Return 0 if operation was successful
1102 *	(memory to allocate, legal context).
1103 * @xfrm_state_alloc_acquire:
1104 *	@x contains the xfrm_state being added to the Security Association
1105 *	Database by the XFRM system.
1106 *	@polsec contains the policy's security context.
1107 *	@secid contains the secid from which to take the mls portion of the
1108 *	context.
1109 *	Allocate a security structure to the x->security field; the security
1110 *	field is initialized to NULL when the xfrm_state is allocated. Set the
1111 *	context to correspond to secid. Return 0 if operation was successful
1112 *	(memory to allocate, legal context).
1113 * @xfrm_state_free_security:
1114 *	@x contains the xfrm_state.
1115 *	Deallocate x->security.
1116 * @xfrm_state_delete_security:
1117 *	@x contains the xfrm_state.
1118 *	Authorize deletion of x->security.
1119 * @xfrm_policy_lookup:
1120 *	@ctx contains the xfrm_sec_ctx for which the access control is being
1121 *	checked.
1122 *	@fl_secid contains the flow security label that is used to authorize
1123 *	access to the policy xp.
1124 *	@dir contains the direction of the flow (input or output).
1125 *	Check permission when a flow selects a xfrm_policy for processing
1126 *	XFRMs on a packet.  The hook is called when selecting either a
1127 *	per-socket policy or a generic xfrm policy.
1128 *	Return 0 if permission is granted, -ESRCH otherwise, or -errno
1129 *	on other errors.
1130 * @xfrm_state_pol_flow_match:
1131 *	@x contains the state to match.
1132 *	@xp contains the policy to check for a match.
1133 *	@flic contains the flowi_common struct to check for a match.
1134 *	Return 1 if there is a match.
1135 * @xfrm_decode_session:
1136 *	@skb points to skb to decode.
1137 *	@secid points to the flow key secid to set.
1138 *	@ckall says if all xfrms used should be checked for same secid.
1139 *	Return 0 if ckall is zero or all xfrms used have the same secid.
1140 *
1141 * Security hooks affecting all Key Management operations
1142 *
1143 * @key_alloc:
1144 *	Permit allocation of a key and assign security data. Note that key does
1145 *	not have a serial number assigned at this point.
1146 *	@key points to the key.
1147 *	@flags is the allocation flags
1148 *	Return 0 if permission is granted, -ve error otherwise.
1149 * @key_free:
1150 *	Notification of destruction; free security data.
1151 *	@key points to the key.
1152 *	No return value.
1153 * @key_permission:
1154 *	See whether a specific operational right is granted to a process on a
1155 *	key.
1156 *	@key_ref refers to the key (key pointer + possession attribute bit).
1157 *	@cred points to the credentials to provide the context against which to
1158 *	evaluate the security data on the key.
1159 *	@perm describes the combination of permissions required of this key.
1160 *	Return 0 if permission is granted, -ve error otherwise.
1161 * @key_getsecurity:
1162 *	Get a textual representation of the security context attached to a key
1163 *	for the purposes of honouring KEYCTL_GETSECURITY.  This function
1164 *	allocates the storage for the NUL-terminated string and the caller
1165 *	should free it.
1166 *	@key points to the key to be queried.
1167 *	@_buffer points to a pointer that should be set to point to the
1168 *	resulting string (if no label or an error occurs).
1169 *	Return the length of the string (including terminating NUL) or -ve if
1170 *	an error.
1171 *	May also return 0 (and a NULL buffer pointer) if there is no label.
1172 *
1173 * Security hooks affecting all System V IPC operations.
1174 *
1175 * @ipc_permission:
1176 *	Check permissions for access to IPC
1177 *	@ipcp contains the kernel IPC permission structure
1178 *	@flag contains the desired (requested) permission set
1179 *	Return 0 if permission is granted.
1180 * @ipc_getsecid:
1181 *	Get the secid associated with the ipc object.
1182 *	@ipcp contains the kernel IPC permission structure.
1183 *	@secid contains a pointer to the location where result will be saved.
1184 *	In case of failure, @secid will be set to zero.
1185 *
1186 * Security hooks for individual messages held in System V IPC message queues
1187 *
1188 * @msg_msg_alloc_security:
1189 *	Allocate and attach a security structure to the msg->security field.
1190 *	The security field is initialized to NULL when the structure is first
1191 *	created.
1192 *	@msg contains the message structure to be modified.
1193 *	Return 0 if operation was successful and permission is granted.
1194 * @msg_msg_free_security:
1195 *	Deallocate the security structure for this message.
1196 *	@msg contains the message structure to be modified.
1197 *
1198 * Security hooks for System V IPC Message Queues
1199 *
1200 * @msg_queue_alloc_security:
1201 *	Allocate and attach a security structure to the
1202 *	@perm->security field. The security field is initialized to
1203 *	NULL when the structure is first created.
1204 *	@perm contains the IPC permissions of the message queue.
1205 *	Return 0 if operation was successful and permission is granted.
1206 * @msg_queue_free_security:
1207 *	Deallocate security field @perm->security for the message queue.
1208 *	@perm contains the IPC permissions of the message queue.
1209 * @msg_queue_associate:
1210 *	Check permission when a message queue is requested through the
1211 *	msgget system call. This hook is only called when returning the
1212 *	message queue identifier for an existing message queue, not when a
1213 *	new message queue is created.
1214 *	@perm contains the IPC permissions of the message queue.
1215 *	@msqflg contains the operation control flags.
1216 *	Return 0 if permission is granted.
1217 * @msg_queue_msgctl:
1218 *	Check permission when a message control operation specified by @cmd
1219 *	is to be performed on the message queue with permissions @perm.
1220 *	The @perm may be NULL, e.g. for IPC_INFO or MSG_INFO.
1221 *	@perm contains the IPC permissions of the msg queue. May be NULL.
1222 *	@cmd contains the operation to be performed.
1223 *	Return 0 if permission is granted.
1224 * @msg_queue_msgsnd:
1225 *	Check permission before a message, @msg, is enqueued on the message
1226 *	queue with permissions @perm.
1227 *	@perm contains the IPC permissions of the message queue.
1228 *	@msg contains the message to be enqueued.
1229 *	@msqflg contains operational flags.
1230 *	Return 0 if permission is granted.
1231 * @msg_queue_msgrcv:
1232 *	Check permission before a message, @msg, is removed from the message
1233 *	queue. The @target task structure contains a pointer to the
1234 *	process that will be receiving the message (not equal to the current
1235 *	process when inline receives are being performed).
1236 *	@perm contains the IPC permissions of the message queue.
1237 *	@msg contains the message destination.
1238 *	@target contains the task structure for recipient process.
1239 *	@type contains the type of message requested.
1240 *	@mode contains the operational flags.
1241 *	Return 0 if permission is granted.
1242 *
1243 * Security hooks for System V Shared Memory Segments
1244 *
1245 * @shm_alloc_security:
1246 *	Allocate and attach a security structure to the @perm->security
1247 *	field. The security field is initialized to NULL when the structure is
1248 *	first created.
1249 *	@perm contains the IPC permissions of the shared memory structure.
1250 *	Return 0 if operation was successful and permission is granted.
1251 * @shm_free_security:
1252 *	Deallocate the security structure @perm->security for the memory segment.
1253 *	@perm contains the IPC permissions of the shared memory structure.
1254 * @shm_associate:
1255 *	Check permission when a shared memory region is requested through the
1256 *	shmget system call. This hook is only called when returning the shared
1257 *	memory region identifier for an existing region, not when a new shared
1258 *	memory region is created.
1259 *	@perm contains the IPC permissions of the shared memory structure.
1260 *	@shmflg contains the operation control flags.
1261 *	Return 0 if permission is granted.
1262 * @shm_shmctl:
1263 *	Check permission when a shared memory control operation specified by
1264 *	@cmd is to be performed on the shared memory region with permissions @perm.
1265 *	The @perm may be NULL, e.g. for IPC_INFO or SHM_INFO.
1266 *	@perm contains the IPC permissions of the shared memory structure.
1267 *	@cmd contains the operation to be performed.
1268 *	Return 0 if permission is granted.
1269 * @shm_shmat:
1270 *	Check permissions prior to allowing the shmat system call to attach the
1271 *	shared memory segment with permissions @perm to the data segment of the
1272 *	calling process. The attaching address is specified by @shmaddr.
1273 *	@perm contains the IPC permissions of the shared memory structure.
1274 *	@shmaddr contains the address to attach memory region to.
1275 *	@shmflg contains the operational flags.
1276 *	Return 0 if permission is granted.
1277 *
1278 * Security hooks for System V Semaphores
1279 *
1280 * @sem_alloc_security:
1281 *	Allocate and attach a security structure to the @perm->security
1282 *	field. The security field is initialized to NULL when the structure is
1283 *	first created.
1284 *	@perm contains the IPC permissions of the semaphore.
1285 *	Return 0 if operation was successful and permission is granted.
1286 * @sem_free_security:
1287 *	Deallocate security structure @perm->security for the semaphore.
1288 *	@perm contains the IPC permissions of the semaphore.
1289 * @sem_associate:
1290 *	Check permission when a semaphore is requested through the semget
1291 *	system call. This hook is only called when returning the semaphore
1292 *	identifier for an existing semaphore, not when a new one must be
1293 *	created.
1294 *	@perm contains the IPC permissions of the semaphore.
1295 *	@semflg contains the operation control flags.
1296 *	Return 0 if permission is granted.
1297 * @sem_semctl:
1298 *	Check permission when a semaphore operation specified by @cmd is to be
1299 *	performed on the semaphore. The @perm may be NULL, e.g. for
1300 *	IPC_INFO or SEM_INFO.
1301 *	@perm contains the IPC permissions of the semaphore. May be NULL.
1302 *	@cmd contains the operation to be performed.
1303 *	Return 0 if permission is granted.
1304 * @sem_semop:
1305 *	Check permissions before performing operations on members of the
1306 *	semaphore set. If the @alter flag is nonzero, the semaphore set
1307 *	may be modified.
1308 *	@perm contains the IPC permissions of the semaphore.
1309 *	@sops contains the operations to perform.
1310 *	@nsops contains the number of operations to perform.
1311 *	@alter contains the flag indicating whether changes are to be made.
1312 *	Return 0 if permission is granted.
1313 *
1314 * @binder_set_context_mgr:
1315 *	Check whether @mgr is allowed to be the binder context manager.
1316 *	@mgr contains the task_struct for the task being registered.
1317 *	Return 0 if permission is granted.
1318 * @binder_transaction:
1319 *	Check whether @from is allowed to invoke a binder transaction call
1320 *	to @to.
1321 *	@from contains the task_struct for the sending task.
1322 *	@to contains the task_struct for the receiving task.
1323 * @binder_transfer_binder:
1324 *	Check whether @from is allowed to transfer a binder reference to @to.
1325 *	@from contains the task_struct for the sending task.
1326 *	@to contains the task_struct for the receiving task.
1327 * @binder_transfer_file:
1328 *	Check whether @from is allowed to transfer @file to @to.
1329 *	@from contains the task_struct for the sending task.
1330 *	@file contains the struct file being transferred.
1331 *	@to contains the task_struct for the receiving task.
1332 *
1333 * @ptrace_access_check:
1334 *	Check permission before allowing the current process to trace the
1335 *	@child process.
1336 *	Security modules may also want to perform a process tracing check
1337 *	during an execve in the set_security or apply_creds hooks of
1338 *	tracing check during an execve in the bprm_set_creds hook of
1339 *	binprm_security_ops if the process is being traced and its security
1340 *	attributes would be changed by the execve.
1341 *	@child contains the task_struct structure for the target process.
1342 *	@mode contains the PTRACE_MODE flags indicating the form of access.
1343 *	Return 0 if permission is granted.
1344 * @ptrace_traceme:
1345 *	Check that the @parent process has sufficient permission to trace the
1346 *	current process before allowing the current process to present itself
1347 *	to the @parent process for tracing.
1348 *	@parent contains the task_struct structure for debugger process.
1349 *	Return 0 if permission is granted.
1350 * @capget:
1351 *	Get the @effective, @inheritable, and @permitted capability sets for
1352 *	the @target process.  The hook may also perform permission checking to
1353 *	determine if the current process is allowed to see the capability sets
1354 *	of the @target process.
1355 *	@target contains the task_struct structure for target process.
1356 *	@effective contains the effective capability set.
1357 *	@inheritable contains the inheritable capability set.
1358 *	@permitted contains the permitted capability set.
1359 *	Return 0 if the capability sets were successfully obtained.
1360 * @capset:
1361 *	Set the @effective, @inheritable, and @permitted capability sets for
1362 *	the current process.
1363 *	@new contains the new credentials structure for target process.
1364 *	@old contains the current credentials structure for target process.
1365 *	@effective contains the effective capability set.
1366 *	@inheritable contains the inheritable capability set.
1367 *	@permitted contains the permitted capability set.
1368 *	Return 0 and update @new if permission is granted.
1369 * @capable:
1370 *	Check whether the @tsk process has the @cap capability in the indicated
1371 *	credentials.
1372 *	@cred contains the credentials to use.
1373 *	@ns contains the user namespace we want the capability in
1374 *	@cap contains the capability <include/linux/capability.h>.
1375 *	@opts contains options for the capable check <include/linux/security.h>
1376 *	Return 0 if the capability is granted for @tsk.
1377 * @quotactl:
1378 * 	Check whether the quotactl syscall is allowed for this @sb.
1379 * @quota_on:
1380 * 	Check whether QUOTAON is allowed for this @dentry.
1381 * @syslog:
1382 *	Check permission before accessing the kernel message ring or changing
1383 *	logging to the console.
1384 *	See the syslog(2) manual page for an explanation of the @type values.
1385 *	@type contains the SYSLOG_ACTION_* constant from <include/linux/syslog.h>
1386 *	Return 0 if permission is granted.
1387 * @settime:
1388 *	Check permission to change the system time.
1389 *	struct timespec64 is defined in <include/linux/time64.h> and timezone
1390 *	is defined in <include/linux/time.h>
1391 *	@ts contains new time
1392 *	@tz contains new timezone
1393 *	Return 0 if permission is granted.
1394 * @vm_enough_memory:
1395 *	Check permissions for allocating a new virtual mapping.
1396 *	@mm contains the mm struct it is being added to.
1397 *	@pages contains the number of pages.
1398 *	Return 0 if permission is granted.
1399 *
1400 * @ismaclabel:
1401 *	Check if the extended attribute specified by @name
1402 *	represents a MAC label. Returns 1 if name is a MAC
1403 *	attribute otherwise returns 0.
1404 *	@name full extended attribute name to check against
1405 *	LSM as a MAC label.
1406 *
1407 * @secid_to_secctx:
1408 *	Convert secid to security context.  If secdata is NULL the length of
1409 *	the result will be returned in seclen, but no secdata will be returned.
1410 *	This does mean that the length could change between calls to check the
1411 *	length and the next call which actually allocates and returns the
1412 *	secdata.
1413 *	@secid contains the security ID.
1414 *	@secdata contains the pointer that stores the converted security
1415 *	context.
1416 *	@seclen pointer which contains the length of the data
1417 * @secctx_to_secid:
1418 *	Convert security context to secid.
1419 *	@secid contains the pointer to the generated security ID.
1420 *	@secdata contains the security context.
1421 *
1422 * @release_secctx:
1423 *	Release the security context.
1424 *	@secdata contains the security context.
1425 *	@seclen contains the length of the security context.
1426 *
1427 * Security hooks for Audit
1428 *
1429 * @audit_rule_init:
1430 *	Allocate and initialize an LSM audit rule structure.
1431 *	@field contains the required Audit action.
1432 *	Fields flags are defined in <include/linux/audit.h>
1433 *	@op contains the operator the rule uses.
1434 *	@rulestr contains the context where the rule will be applied to.
1435 *	@lsmrule contains a pointer to receive the result.
1436 *	Return 0 if @lsmrule has been successfully set,
1437 *	-EINVAL in case of an invalid rule.
1438 *
1439 * @audit_rule_known:
1440 *	Specifies whether given @krule contains any fields related to
1441 *	current LSM.
1442 *	@krule contains the audit rule of interest.
1443 *	Return 1 in case of relation found, 0 otherwise.
1444 *
1445 * @audit_rule_match:
1446 *	Determine if given @secid matches a rule previously approved
1447 *	by @audit_rule_known.
1448 *	@secid contains the security id in question.
1449 *	@field contains the field which relates to current LSM.
1450 *	@op contains the operator that will be used for matching.
1451 *	@lrule points to the audit rule that will be checked against.
1452 *	Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1453 *
1454 * @audit_rule_free:
1455 *	Deallocate the LSM audit rule structure previously allocated by
1456 *	audit_rule_init.
1457 *	@lsmrule contains the allocated rule
1458 *
1459 * @inode_invalidate_secctx:
1460 *	Notify the security module that it must revalidate the security context
1461 *	of an inode.
1462 *
1463 * @inode_notifysecctx:
1464 *	Notify the security module of what the security context of an inode
1465 *	should be.  Initializes the incore security context managed by the
1466 *	security module for this inode.  Example usage:  NFS client invokes
1467 *	this hook to initialize the security context in its incore inode to the
1468 *	value provided by the server for the file when the server returned the
1469 *	file's attributes to the client.
1470 *	Must be called with inode->i_mutex locked.
1471 *	@inode we wish to set the security context of.
1472 *	@ctx contains the string which we wish to set in the inode.
1473 *	@ctxlen contains the length of @ctx.
1474 *
1475 * @inode_setsecctx:
1476 *	Change the security context of an inode.  Updates the
1477 *	incore security context managed by the security module and invokes the
1478 *	fs code as needed (via __vfs_setxattr_noperm) to update any backing
1479 *	xattrs that represent the context.  Example usage:  NFS server invokes
1480 *	this hook to change the security context in its incore inode and on the
1481 *	backing filesystem to a value provided by the client on a SETATTR
1482 *	operation.
1483 *	Must be called with inode->i_mutex locked.
1484 *	@dentry contains the inode we wish to set the security context of.
1485 *	@ctx contains the string which we wish to set in the inode.
1486 *	@ctxlen contains the length of @ctx.
1487 *
1488 * @inode_getsecctx:
1489 *	On success, returns 0 and fills out @ctx and @ctxlen with the security
1490 *	context for the given @inode.
1491 *	@inode we wish to get the security context of.
1492 *	@ctx is a pointer in which to place the allocated security context.
1493 *	@ctxlen points to the place to put the length of @ctx.
1494 *
1495 * Security hooks for the general notification queue:
1496 *
1497 * @post_notification:
1498 *	Check to see if a watch notification can be posted to a particular
1499 *	queue.
1500 *	@w_cred: The credentials of the whoever set the watch.
1501 *	@cred: The event-triggerer's credentials
1502 *	@n: The notification being posted
1503 *
1504 * @watch_key:
1505 *	Check to see if a process is allowed to watch for event notifications
1506 *	from a key or keyring.
1507 *	@key: The key to watch.
1508 *
1509 * Security hooks for using the eBPF maps and programs functionalities through
1510 * eBPF syscalls.
1511 *
1512 * @bpf:
1513 *	Do a initial check for all bpf syscalls after the attribute is copied
1514 *	into the kernel. The actual security module can implement their own
1515 *	rules to check the specific cmd they need.
1516 *
1517 * @bpf_map:
1518 *	Do a check when the kernel generate and return a file descriptor for
1519 *	eBPF maps.
1520 *
1521 *	@map: bpf map that we want to access
1522 *	@mask: the access flags
1523 *
1524 * @bpf_prog:
1525 *	Do a check when the kernel generate and return a file descriptor for
1526 *	eBPF programs.
1527 *
1528 *	@prog: bpf prog that userspace want to use.
1529 *
1530 * @bpf_map_alloc_security:
1531 *	Initialize the security field inside bpf map.
1532 *
1533 * @bpf_map_free_security:
1534 *	Clean up the security information stored inside bpf map.
1535 *
1536 * @bpf_prog_alloc_security:
1537 *	Initialize the security field inside bpf program.
1538 *
1539 * @bpf_prog_free_security:
1540 *	Clean up the security information stored inside bpf prog.
1541 *
1542 * @locked_down:
1543 *     Determine whether a kernel feature that potentially enables arbitrary
1544 *     code execution in kernel space should be permitted.
1545 *
1546 *     @what: kernel feature being accessed
1547 *
1548 * Security hooks for perf events
1549 *
1550 * @perf_event_open:
1551 * 	Check whether the @type of perf_event_open syscall is allowed.
1552 * @perf_event_alloc:
1553 * 	Allocate and save perf_event security info.
1554 * @perf_event_free:
1555 * 	Release (free) perf_event security info.
1556 * @perf_event_read:
1557 * 	Read perf_event security info if allowed.
1558 * @perf_event_write:
1559 * 	Write perf_event security info if allowed.
1560 */
1561union security_list_options {
1562	#define LSM_HOOK(RET, DEFAULT, NAME, ...) RET (*NAME)(__VA_ARGS__);
1563	#include "lsm_hook_defs.h"
1564	#undef LSM_HOOK
1565};
1566
1567struct security_hook_heads {
1568	#define LSM_HOOK(RET, DEFAULT, NAME, ...) struct hlist_head NAME;
1569	#include "lsm_hook_defs.h"
1570	#undef LSM_HOOK
1571} __randomize_layout;
1572
 
 
 
 
 
 
 
 
 
 
 
 
1573/*
1574 * Security module hook list structure.
1575 * For use with generic list macros for common operations.
1576 */
1577struct security_hook_list {
1578	struct hlist_node		list;
1579	struct hlist_head		*head;
1580	union security_list_options	hook;
1581	char				*lsm;
1582} __randomize_layout;
1583
1584/*
1585 * Security blob size or offset data.
1586 */
1587struct lsm_blob_sizes {
1588	int	lbs_cred;
1589	int	lbs_file;
1590	int	lbs_inode;
1591	int	lbs_superblock;
1592	int	lbs_ipc;
1593	int	lbs_msg_msg;
1594	int	lbs_task;
 
1595};
1596
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1597/*
1598 * LSM_RET_VOID is used as the default value in LSM_HOOK definitions for void
1599 * LSM hooks (in include/linux/lsm_hook_defs.h).
1600 */
1601#define LSM_RET_VOID ((void) 0)
1602
1603/*
1604 * Initializing a security_hook_list structure takes
1605 * up a lot of space in a source file. This macro takes
1606 * care of the common case and reduces the amount of
1607 * text involved.
1608 */
1609#define LSM_HOOK_INIT(HEAD, HOOK) \
1610	{ .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
1611
1612extern struct security_hook_heads security_hook_heads;
1613extern char *lsm_names;
1614
1615extern void security_add_hooks(struct security_hook_list *hooks, int count,
1616				char *lsm);
1617
1618#define LSM_FLAG_LEGACY_MAJOR	BIT(0)
1619#define LSM_FLAG_EXCLUSIVE	BIT(1)
1620
1621enum lsm_order {
1622	LSM_ORDER_FIRST = -1,	/* This is only for capabilities. */
1623	LSM_ORDER_MUTABLE = 0,
 
1624};
1625
1626struct lsm_info {
1627	const char *name;	/* Required. */
1628	enum lsm_order order;	/* Optional: default is LSM_ORDER_MUTABLE */
1629	unsigned long flags;	/* Optional: flags describing LSM */
1630	int *enabled;		/* Optional: controlled by CONFIG_LSM */
1631	int (*init)(void);	/* Required. */
1632	struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */
1633};
1634
1635extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
1636extern struct lsm_info __start_early_lsm_info[], __end_early_lsm_info[];
1637
1638#define DEFINE_LSM(lsm)							\
1639	static struct lsm_info __lsm_##lsm				\
1640		__used __section(".lsm_info.init")			\
1641		__aligned(sizeof(unsigned long))
1642
1643#define DEFINE_EARLY_LSM(lsm)						\
1644	static struct lsm_info __early_lsm_##lsm			\
1645		__used __section(".early_lsm_info.init")		\
1646		__aligned(sizeof(unsigned long))
1647
1648#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1649/*
1650 * Assuring the safety of deleting a security module is up to
1651 * the security module involved. This may entail ordering the
1652 * module's hook list in a particular way, refusing to disable
1653 * the module once a policy is loaded or any number of other
1654 * actions better imagined than described.
1655 *
1656 * The name of the configuration option reflects the only module
1657 * that currently uses the mechanism. Any developer who thinks
1658 * disabling their module is a good idea needs to be at least as
1659 * careful as the SELinux team.
1660 */
1661static inline void security_delete_hooks(struct security_hook_list *hooks,
1662						int count)
1663{
1664	int i;
1665
1666	for (i = 0; i < count; i++)
1667		hlist_del_rcu(&hooks[i].list);
1668}
1669#endif /* CONFIG_SECURITY_SELINUX_DISABLE */
1670
1671/* Currently required to handle SELinux runtime hook disable. */
1672#ifdef CONFIG_SECURITY_WRITABLE_HOOKS
1673#define __lsm_ro_after_init
1674#else
1675#define __lsm_ro_after_init	__ro_after_init
1676#endif /* CONFIG_SECURITY_WRITABLE_HOOKS */
1677
1678extern int lsm_inode_alloc(struct inode *inode);
1679
1680#endif /* ! __LINUX_LSM_HOOKS_H */