| blob | 7ce53ae1266bf04c0305f8b695dc240818a7d4ca |
1 /*
2 * Linux Security plug
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 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * Due to this file being licensed under the GPL there is controversy over
16 * whether this permits you to write a module that #includes this file
17 * without placing your module under the GPL. Please consult a lawyer for
18 * advice before doing this.
19 *
20 */
22 #ifndef __LINUX_SECURITY_H
23 #define __LINUX_SECURITY_H
25 #include <linux/key.h>
26 #include <linux/capability.h>
27 #include <linux/slab.h>
28 #include <linux/err.h>
29 #include <linux/string.h>
57 /* Maximum number of letters for an LSM name string */
58 #define SECURITY_NAME_MAX 10
60 /* If capable should audit the security request */
61 #define SECURITY_CAP_NOAUDIT 0
62 #define SECURITY_CAP_AUDIT 1
64 /* LSM Agnostic defines for sb_set_mnt_opts */
65 #define SECURITY_LSM_NATIVE_LABELS 1
72 /*
73 * These functions are in security/capability.c and are used
74 * as the default capabilities functions
75 */
81 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
121 #ifdef CONFIG_MMU
124 #else
125 #define mmap_min_addr 0UL
126 #define dac_mmap_min_addr 0UL
127 #endif
129 /*
130 * Values used in the task_security_ops calls
131 */
132 /* setuid or setgid, id0 == uid or gid */
133 #define LSM_SETID_ID 1
135 /* setreuid or setregid, id0 == real, id1 == eff */
136 #define LSM_SETID_RE 2
138 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
139 #define LSM_SETID_RES 4
141 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
142 #define LSM_SETID_FS 8
144 /* forward declares to avoid warnings */
148 /* bprm->unsafe reasons */
149 #define LSM_UNSAFE_SHARE 1
150 #define LSM_UNSAFE_PTRACE 2
151 #define LSM_UNSAFE_PTRACE_CAP 4
152 #define LSM_UNSAFE_NO_NEW_PRIVS 8
154 #ifdef CONFIG_MMU
157 #endif
159 /* security_inode_init_security callback function to write xattrs */
163 #ifdef CONFIG_SECURITY
169 };
172 {
176 }
179 {
189 }
191 /**
192 * struct security_operations - main security structure
193 *
194 * Security module identifier.
195 *
196 * @name:
197 * A string that acts as a unique identifier for the LSM with max number
198 * of characters = SECURITY_NAME_MAX.
199 *
200 * Security hooks for program execution operations.
201 *
202 * @bprm_set_creds:
203 * Save security information in the bprm->security field, typically based
204 * on information about the bprm->file, for later use by the apply_creds
205 * hook. This hook may also optionally check permissions (e.g. for
206 * transitions between security domains).
207 * This hook may be called multiple times during a single execve, e.g. for
208 * interpreters. The hook can tell whether it has already been called by
209 * checking to see if @bprm->security is non-NULL. If so, then the hook
210 * may decide either to retain the security information saved earlier or
211 * to replace it.
212 * @bprm contains the linux_binprm structure.
213 * Return 0 if the hook is successful and permission is granted.
214 * @bprm_check_security:
215 * This hook mediates the point when a search for a binary handler will
216 * begin. It allows a check the @bprm->security value which is set in the
217 * preceding set_creds call. The primary difference from set_creds is
218 * that the argv list and envp list are reliably available in @bprm. This
219 * hook may be called multiple times during a single execve; and in each
220 * pass set_creds is called first.
221 * @bprm contains the linux_binprm structure.
222 * Return 0 if the hook is successful and permission is granted.
223 * @bprm_committing_creds:
224 * Prepare to install the new security attributes of a process being
225 * transformed by an execve operation, based on the old credentials
226 * pointed to by @current->cred and the information set in @bprm->cred by
227 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
228 * This hook is a good place to perform state changes on the process such
229 * as closing open file descriptors to which access will no longer be
230 * granted when the attributes are changed. This is called immediately
231 * before commit_creds().
232 * @bprm_committed_creds:
233 * Tidy up after the installation of the new security attributes of a
234 * process being transformed by an execve operation. The new credentials
235 * have, by this point, been set to @current->cred. @bprm points to the
236 * linux_binprm structure. This hook is a good place to perform state
237 * changes on the process such as clearing out non-inheritable signal
238 * state. This is called immediately after commit_creds().
239 * @bprm_secureexec:
240 * Return a boolean value (0 or 1) indicating whether a "secure exec"
241 * is required. The flag is passed in the auxiliary table
242 * on the initial stack to the ELF interpreter to indicate whether libc
243 * should enable secure mode.
244 * @bprm contains the linux_binprm structure.
245 *
246 * Security hooks for filesystem operations.
247 *
248 * @sb_alloc_security:
249 * Allocate and attach a security structure to the sb->s_security field.
250 * The s_security field is initialized to NULL when the structure is
251 * allocated.
252 * @sb contains the super_block structure to be modified.
253 * Return 0 if operation was successful.
254 * @sb_free_security:
255 * Deallocate and clear the sb->s_security field.
256 * @sb contains the super_block structure to be modified.
257 * @sb_statfs:
258 * Check permission before obtaining filesystem statistics for the @mnt
259 * mountpoint.
260 * @dentry is a handle on the superblock for the filesystem.
261 * Return 0 if permission is granted.
262 * @sb_mount:
263 * Check permission before an object specified by @dev_name is mounted on
264 * the mount point named by @nd. For an ordinary mount, @dev_name
265 * identifies a device if the file system type requires a device. For a
266 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
267 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
268 * pathname of the object being mounted.
269 * @dev_name contains the name for object being mounted.
270 * @path contains the path for mount point object.
271 * @type contains the filesystem type.
272 * @flags contains the mount flags.
273 * @data contains the filesystem-specific data.
274 * Return 0 if permission is granted.
275 * @sb_copy_data:
276 * Allow mount option data to be copied prior to parsing by the filesystem,
277 * so that the security module can extract security-specific mount
278 * options cleanly (a filesystem may modify the data e.g. with strsep()).
279 * This also allows the original mount data to be stripped of security-
280 * specific options to avoid having to make filesystems aware of them.
281 * @type the type of filesystem being mounted.
282 * @orig the original mount data copied from userspace.
283 * @copy copied data which will be passed to the security module.
284 * Returns 0 if the copy was successful.
285 * @sb_remount:
286 * Extracts security system specific mount options and verifies no changes
287 * are being made to those options.
288 * @sb superblock being remounted
289 * @data contains the filesystem-specific data.
290 * Return 0 if permission is granted.
291 * @sb_umount:
292 * Check permission before the @mnt file system is unmounted.
293 * @mnt contains the mounted file system.
294 * @flags contains the unmount flags, e.g. MNT_FORCE.
295 * Return 0 if permission is granted.
296 * @sb_pivotroot:
297 * Check permission before pivoting the root filesystem.
298 * @old_path contains the path for the new location of the current root (put_old).
299 * @new_path contains the path for the new root (new_root).
300 * Return 0 if permission is granted.
301 * @sb_set_mnt_opts:
302 * Set the security relevant mount options used for a superblock
303 * @sb the superblock to set security mount options for
304 * @opts binary data structure containing all lsm mount data
305 * @sb_clone_mnt_opts:
306 * Copy all security options from a given superblock to another
307 * @oldsb old superblock which contain information to clone
308 * @newsb new superblock which needs filled in
309 * @sb_parse_opts_str:
310 * Parse a string of security data filling in the opts structure
311 * @options string containing all mount options known by the LSM
312 * @opts binary data structure usable by the LSM
313 * @dentry_init_security:
314 * Compute a context for a dentry as the inode is not yet available
315 * since NFSv4 has no label backed by an EA anyway.
316 * @dentry dentry to use in calculating the context.
317 * @mode mode used to determine resource type.
318 * @name name of the last path component used to create file
319 * @ctx pointer to place the pointer to the resulting context in.
320 * @ctxlen point to place the length of the resulting context.
321 *
322 *
323 * Security hooks for inode operations.
324 *
325 * @inode_alloc_security:
326 * Allocate and attach a security structure to @inode->i_security. The
327 * i_security field is initialized to NULL when the inode structure is
328 * allocated.
329 * @inode contains the inode structure.
330 * Return 0 if operation was successful.
331 * @inode_free_security:
332 * @inode contains the inode structure.
333 * Deallocate the inode security structure and set @inode->i_security to
334 * NULL.
335 * @inode_init_security:
336 * Obtain the security attribute name suffix and value to set on a newly
337 * created inode and set up the incore security field for the new inode.
338 * This hook is called by the fs code as part of the inode creation
339 * transaction and provides for atomic labeling of the inode, unlike
340 * the post_create/mkdir/... hooks called by the VFS. The hook function
341 * is expected to allocate the name and value via kmalloc, with the caller
342 * being responsible for calling kfree after using them.
343 * If the security module does not use security attributes or does
344 * not wish to put a security attribute on this particular inode,
345 * then it should return -EOPNOTSUPP to skip this processing.
346 * @inode contains the inode structure of the newly created inode.
347 * @dir contains the inode structure of the parent directory.
348 * @qstr contains the last path component of the new object
349 * @name will be set to the allocated name suffix (e.g. selinux).
350 * @value will be set to the allocated attribute value.
351 * @len will be set to the length of the value.
352 * Returns 0 if @name and @value have been successfully set,
353 * -EOPNOTSUPP if no security attribute is needed, or
354 * -ENOMEM on memory allocation failure.
355 * @inode_create:
356 * Check permission to create a regular file.
357 * @dir contains inode structure of the parent of the new file.
358 * @dentry contains the dentry structure for the file to be created.
359 * @mode contains the file mode of the file to be created.
360 * Return 0 if permission is granted.
361 * @inode_link:
362 * Check permission before creating a new hard link to a file.
363 * @old_dentry contains the dentry structure for an existing link to the file.
364 * @dir contains the inode structure of the parent directory of the new link.
365 * @new_dentry contains the dentry structure for the new link.
366 * Return 0 if permission is granted.
367 * @path_link:
368 * Check permission before creating a new hard link to a file.
369 * @old_dentry contains the dentry structure for an existing link
370 * to the file.
371 * @new_dir contains the path structure of the parent directory of
372 * the new link.
373 * @new_dentry contains the dentry structure for the new link.
374 * Return 0 if permission is granted.
375 * @inode_unlink:
376 * Check the permission to remove a hard link to a file.
377 * @dir contains the inode structure of parent directory of the file.
378 * @dentry contains the dentry structure for file to be unlinked.
379 * Return 0 if permission is granted.
380 * @path_unlink:
381 * Check the permission to remove a hard link to a file.
382 * @dir contains the path structure of parent directory of the file.
383 * @dentry contains the dentry structure for file to be unlinked.
384 * Return 0 if permission is granted.
385 * @inode_symlink:
386 * Check the permission to create a symbolic link to a file.
387 * @dir contains the inode structure of parent directory of the symbolic link.
388 * @dentry contains the dentry structure of the symbolic link.
389 * @old_name contains the pathname of file.
390 * Return 0 if permission is granted.
391 * @path_symlink:
392 * Check the permission to create a symbolic link to a file.
393 * @dir contains the path structure of parent directory of
394 * the symbolic link.
395 * @dentry contains the dentry structure of the symbolic link.
396 * @old_name contains the pathname of file.
397 * Return 0 if permission is granted.
398 * @inode_mkdir:
399 * Check permissions to create a new directory in the existing directory
400 * associated with inode structure @dir.
401 * @dir contains the inode structure of parent of the directory to be created.
402 * @dentry contains the dentry structure of new directory.
403 * @mode contains the mode of new directory.
404 * Return 0 if permission is granted.
405 * @path_mkdir:
406 * Check permissions to create a new directory in the existing directory
407 * associated with path structure @path.
408 * @dir contains the path structure of parent of the directory
409 * to be created.
410 * @dentry contains the dentry structure of new directory.
411 * @mode contains the mode of new directory.
412 * Return 0 if permission is granted.
413 * @inode_rmdir:
414 * Check the permission to remove a directory.
415 * @dir contains the inode structure of parent of the directory to be removed.
416 * @dentry contains the dentry structure of directory to be removed.
417 * Return 0 if permission is granted.
418 * @path_rmdir:
419 * Check the permission to remove a directory.
420 * @dir contains the path structure of parent of the directory to be
421 * removed.
422 * @dentry contains the dentry structure of directory to be removed.
423 * Return 0 if permission is granted.
424 * @inode_mknod:
425 * Check permissions when creating a special file (or a socket or a fifo
426 * file created via the mknod system call). Note that if mknod operation
427 * is being done for a regular file, then the create hook will be called
428 * and not this hook.
429 * @dir contains the inode structure of parent of the new file.
430 * @dentry contains the dentry structure of the new file.
431 * @mode contains the mode of the new file.
432 * @dev contains the device number.
433 * Return 0 if permission is granted.
434 * @path_mknod:
435 * Check permissions when creating a file. Note that this hook is called
436 * even if mknod operation is being done for a regular file.
437 * @dir contains the path structure of parent of the new file.
438 * @dentry contains the dentry structure of the new file.
439 * @mode contains the mode of the new file.
440 * @dev contains the undecoded device number. Use new_decode_dev() to get
441 * the decoded device number.
442 * Return 0 if permission is granted.
443 * @inode_rename:
444 * Check for permission to rename a file or directory.
445 * @old_dir contains the inode structure for parent of the old link.
446 * @old_dentry contains the dentry structure of the old link.
447 * @new_dir contains the inode structure for parent of the new link.
448 * @new_dentry contains the dentry structure of the new link.
449 * Return 0 if permission is granted.
450 * @path_rename:
451 * Check for permission to rename a file or directory.
452 * @old_dir contains the path structure for parent of the old link.
453 * @old_dentry contains the dentry structure of the old link.
454 * @new_dir contains the path structure for parent of the new link.
455 * @new_dentry contains the dentry structure of the new link.
456 * Return 0 if permission is granted.
457 * @path_chmod:
458 * Check for permission to change DAC's permission of a file or directory.
459 * @dentry contains the dentry structure.
460 * @mnt contains the vfsmnt structure.
461 * @mode contains DAC's mode.
462 * Return 0 if permission is granted.
463 * @path_chown:
464 * Check for permission to change owner/group of a file or directory.
465 * @path contains the path structure.
466 * @uid contains new owner's ID.
467 * @gid contains new group's ID.
468 * Return 0 if permission is granted.
469 * @path_chroot:
470 * Check for permission to change root directory.
471 * @path contains the path structure.
472 * Return 0 if permission is granted.
473 * @inode_readlink:
474 * Check the permission to read the symbolic link.
475 * @dentry contains the dentry structure for the file link.
476 * Return 0 if permission is granted.
477 * @inode_follow_link:
478 * Check permission to follow a symbolic link when looking up a pathname.
479 * @dentry contains the dentry structure for the link.
480 * @nd contains the nameidata structure for the parent directory.
481 * Return 0 if permission is granted.
482 * @inode_permission:
483 * Check permission before accessing an inode. This hook is called by the
484 * existing Linux permission function, so a security module can use it to
485 * provide additional checking for existing Linux permission checks.
486 * Notice that this hook is called when a file is opened (as well as many
487 * other operations), whereas the file_security_ops permission hook is
488 * called when the actual read/write operations are performed.
489 * @inode contains the inode structure to check.
490 * @mask contains the permission mask.
491 * Return 0 if permission is granted.
492 * @inode_setattr:
493 * Check permission before setting file attributes. Note that the kernel
494 * call to notify_change is performed from several locations, whenever
495 * file attributes change (such as when a file is truncated, chown/chmod
496 * operations, transferring disk quotas, etc).
497 * @dentry contains the dentry structure for the file.
498 * @attr is the iattr structure containing the new file attributes.
499 * Return 0 if permission is granted.
500 * @path_truncate:
501 * Check permission before truncating a file.
502 * @path contains the path structure for the file.
503 * Return 0 if permission is granted.
504 * @inode_getattr:
505 * Check permission before obtaining file attributes.
506 * @mnt is the vfsmount where the dentry was looked up
507 * @dentry contains the dentry structure for the file.
508 * Return 0 if permission is granted.
509 * @inode_setxattr:
510 * Check permission before setting the extended attributes
511 * @value identified by @name for @dentry.
512 * Return 0 if permission is granted.
513 * @inode_post_setxattr:
514 * Update inode security field after successful setxattr operation.
515 * @value identified by @name for @dentry.
516 * @inode_getxattr:
517 * Check permission before obtaining the extended attributes
518 * identified by @name for @dentry.
519 * Return 0 if permission is granted.
520 * @inode_listxattr:
521 * Check permission before obtaining the list of extended attribute
522 * names for @dentry.
523 * Return 0 if permission is granted.
524 * @inode_removexattr:
525 * Check permission before removing the extended attribute
526 * identified by @name for @dentry.
527 * Return 0 if permission is granted.
528 * @inode_getsecurity:
529 * Retrieve a copy of the extended attribute representation of the
530 * security label associated with @name for @inode via @buffer. Note that
531 * @name is the remainder of the attribute name after the security prefix
532 * has been removed. @alloc is used to specify of the call should return a
533 * value via the buffer or just the value length Return size of buffer on
534 * success.
535 * @inode_setsecurity:
536 * Set the security label associated with @name for @inode from the
537 * extended attribute value @value. @size indicates the size of the
538 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
539 * Note that @name is the remainder of the attribute name after the
540 * security. prefix has been removed.
541 * Return 0 on success.
542 * @inode_listsecurity:
543 * Copy the extended attribute names for the security labels
544 * associated with @inode into @buffer. The maximum size of @buffer
545 * is specified by @buffer_size. @buffer may be NULL to request
546 * the size of the buffer required.
547 * Returns number of bytes used/required on success.
548 * @inode_need_killpriv:
549 * Called when an inode has been changed.
550 * @dentry is the dentry being changed.
551 * Return <0 on error to abort the inode change operation.
552 * Return 0 if inode_killpriv does not need to be called.
553 * Return >0 if inode_killpriv does need to be called.
554 * @inode_killpriv:
555 * The setuid bit is being removed. Remove similar security labels.
556 * Called with the dentry->d_inode->i_mutex held.
557 * @dentry is the dentry being changed.
558 * Return 0 on success. If error is returned, then the operation
559 * causing setuid bit removal is failed.
560 * @inode_getsecid:
561 * Get the secid associated with the node.
562 * @inode contains a pointer to the inode.
563 * @secid contains a pointer to the location where result will be saved.
564 * In case of failure, @secid will be set to zero.
565 *
566 * Security hooks for file operations
567 *
568 * @file_permission:
569 * Check file permissions before accessing an open file. This hook is
570 * called by various operations that read or write files. A security
571 * module can use this hook to perform additional checking on these
572 * operations, e.g. to revalidate permissions on use to support privilege
573 * bracketing or policy changes. Notice that this hook is used when the
574 * actual read/write operations are performed, whereas the
575 * inode_security_ops hook is called when a file is opened (as well as
576 * many other operations).
577 * Caveat: Although this hook can be used to revalidate permissions for
578 * various system call operations that read or write files, it does not
579 * address the revalidation of permissions for memory-mapped files.
580 * Security modules must handle this separately if they need such
581 * revalidation.
582 * @file contains the file structure being accessed.
583 * @mask contains the requested permissions.
584 * Return 0 if permission is granted.
585 * @file_alloc_security:
586 * Allocate and attach a security structure to the file->f_security field.
587 * The security field is initialized to NULL when the structure is first
588 * created.
589 * @file contains the file structure to secure.
590 * Return 0 if the hook is successful and permission is granted.
591 * @file_free_security:
592 * Deallocate and free any security structures stored in file->f_security.
593 * @file contains the file structure being modified.
594 * @file_ioctl:
595 * @file contains the file structure.
596 * @cmd contains the operation to perform.
597 * @arg contains the operational arguments.
598 * Check permission for an ioctl operation on @file. Note that @arg
599 * sometimes represents a user space pointer; in other cases, it may be a
600 * simple integer value. When @arg represents a user space pointer, it
601 * should never be used by the security module.
602 * Return 0 if permission is granted.
603 * @mmap_addr :
604 * Check permissions for a mmap operation at @addr.
605 * @addr contains virtual address that will be used for the operation.
606 * Return 0 if permission is granted.
607 * @mmap_file :
608 * Check permissions for a mmap operation. The @file may be NULL, e.g.
609 * if mapping anonymous memory.
610 * @file contains the file structure for file to map (may be NULL).
611 * @reqprot contains the protection requested by the application.
612 * @prot contains the protection that will be applied by the kernel.
613 * @flags contains the operational flags.
614 * Return 0 if permission is granted.
615 * @file_mprotect:
616 * Check permissions before changing memory access permissions.
617 * @vma contains the memory region to modify.
618 * @reqprot contains the protection requested by the application.
619 * @prot contains the protection that will be applied by the kernel.
620 * Return 0 if permission is granted.
621 * @file_lock:
622 * Check permission before performing file locking operations.
623 * Note: this hook mediates both flock and fcntl style locks.
624 * @file contains the file structure.
625 * @cmd contains the posix-translated lock operation to perform
626 * (e.g. F_RDLCK, F_WRLCK).
627 * Return 0 if permission is granted.
628 * @file_fcntl:
629 * Check permission before allowing the file operation specified by @cmd
630 * from being performed on the file @file. Note that @arg sometimes
631 * represents a user space pointer; in other cases, it may be a simple
632 * integer value. When @arg represents a user space pointer, it should
633 * never be used by the security module.
634 * @file contains the file structure.
635 * @cmd contains the operation to be performed.
636 * @arg contains the operational arguments.
637 * Return 0 if permission is granted.
638 * @file_set_fowner:
639 * Save owner security information (typically from current->security) in
640 * file->f_security for later use by the send_sigiotask hook.
641 * @file contains the file structure to update.
642 * Return 0 on success.
643 * @file_send_sigiotask:
644 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
645 * process @tsk. Note that this hook is sometimes called from interrupt.
646 * Note that the fown_struct, @fown, is never outside the context of a
647 * struct file, so the file structure (and associated security information)
648 * can always be obtained:
649 * container_of(fown, struct file, f_owner)
650 * @tsk contains the structure of task receiving signal.
651 * @fown contains the file owner information.
652 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
653 * Return 0 if permission is granted.
654 * @file_receive:
655 * This hook allows security modules to control the ability of a process
656 * to receive an open file descriptor via socket IPC.
657 * @file contains the file structure being received.
658 * Return 0 if permission is granted.
659 * @file_open
660 * Save open-time permission checking state for later use upon
661 * file_permission, and recheck access if anything has changed
662 * since inode_permission.
663 *
664 * Security hooks for task operations.
665 *
666 * @task_create:
667 * Check permission before creating a child process. See the clone(2)
668 * manual page for definitions of the @clone_flags.
669 * @clone_flags contains the flags indicating what should be shared.
670 * Return 0 if permission is granted.
671 * @task_free:
672 * @task task being freed
673 * Handle release of task-related resources. (Note that this can be called
674 * from interrupt context.)
675 * @cred_alloc_blank:
676 * @cred points to the credentials.
677 * @gfp indicates the atomicity of any memory allocations.
678 * Only allocate sufficient memory and attach to @cred such that
679 * cred_transfer() will not get ENOMEM.
680 * @cred_free:
681 * @cred points to the credentials.
682 * Deallocate and clear the cred->security field in a set of credentials.
683 * @cred_prepare:
684 * @new points to the new credentials.
685 * @old points to the original credentials.
686 * @gfp indicates the atomicity of any memory allocations.
687 * Prepare a new set of credentials by copying the data from the old set.
688 * @cred_transfer:
689 * @new points to the new credentials.
690 * @old points to the original credentials.
691 * Transfer data from original creds to new creds
692 * @kernel_act_as:
693 * Set the credentials for a kernel service to act as (subjective context).
694 * @new points to the credentials to be modified.
695 * @secid specifies the security ID to be set
696 * The current task must be the one that nominated @secid.
697 * Return 0 if successful.
698 * @kernel_create_files_as:
699 * Set the file creation context in a set of credentials to be the same as
700 * the objective context of the specified inode.
701 * @new points to the credentials to be modified.
702 * @inode points to the inode to use as a reference.
703 * The current task must be the one that nominated @inode.
704 * Return 0 if successful.
705 * @kernel_module_request:
706 * Ability to trigger the kernel to automatically upcall to userspace for
707 * userspace to load a kernel module with the given name.
708 * @kmod_name name of the module requested by the kernel
709 * Return 0 if successful.
710 * @kernel_module_from_file:
711 * Load a kernel module from userspace.
712 * @file contains the file structure pointing to the file containing
713 * the kernel module to load. If the module is being loaded from a blob,
714 * this argument will be NULL.
715 * Return 0 if permission is granted.
716 * @task_fix_setuid:
717 * Update the module's state after setting one or more of the user
718 * identity attributes of the current process. The @flags parameter
719 * indicates which of the set*uid system calls invoked this hook. If
720 * @new is the set of credentials that will be installed. Modifications
721 * should be made to this rather than to @current->cred.
722 * @old is the set of credentials that are being replaces
723 * @flags contains one of the LSM_SETID_* values.
724 * Return 0 on success.
725 * @task_setpgid:
726 * Check permission before setting the process group identifier of the
727 * process @p to @pgid.
728 * @p contains the task_struct for process being modified.
729 * @pgid contains the new pgid.
730 * Return 0 if permission is granted.
731 * @task_getpgid:
732 * Check permission before getting the process group identifier of the
733 * process @p.
734 * @p contains the task_struct for the process.
735 * Return 0 if permission is granted.
736 * @task_getsid:
737 * Check permission before getting the session identifier of the process
738 * @p.
739 * @p contains the task_struct for the process.
740 * Return 0 if permission is granted.
741 * @task_getsecid:
742 * Retrieve the security identifier of the process @p.
743 * @p contains the task_struct for the process and place is into @secid.
744 * In case of failure, @secid will be set to zero.
745 *
746 * @task_setnice:
747 * Check permission before setting the nice value of @p to @nice.
748 * @p contains the task_struct of process.
749 * @nice contains the new nice value.
750 * Return 0 if permission is granted.
751 * @task_setioprio
752 * Check permission before setting the ioprio value of @p to @ioprio.
753 * @p contains the task_struct of process.
754 * @ioprio contains the new ioprio value
755 * Return 0 if permission is granted.
756 * @task_getioprio
757 * Check permission before getting the ioprio value of @p.
758 * @p contains the task_struct of process.
759 * Return 0 if permission is granted.
760 * @task_setrlimit:
761 * Check permission before setting the resource limits of the current
762 * process for @resource to @new_rlim. The old resource limit values can
763 * be examined by dereferencing (current->signal->rlim + resource).
764 * @resource contains the resource whose limit is being set.
765 * @new_rlim contains the new limits for @resource.
766 * Return 0 if permission is granted.
767 * @task_setscheduler:
768 * Check permission before setting scheduling policy and/or parameters of
769 * process @p based on @policy and @lp.
770 * @p contains the task_struct for process.
771 * @policy contains the scheduling policy.
772 * @lp contains the scheduling parameters.
773 * Return 0 if permission is granted.
774 * @task_getscheduler:
775 * Check permission before obtaining scheduling information for process
776 * @p.
777 * @p contains the task_struct for process.
778 * Return 0 if permission is granted.
779 * @task_movememory
780 * Check permission before moving memory owned by process @p.
781 * @p contains the task_struct for process.
782 * Return 0 if permission is granted.
783 * @task_kill:
784 * Check permission before sending signal @sig to @p. @info can be NULL,
785 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
786 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
787 * from the kernel and should typically be permitted.
788 * SIGIO signals are handled separately by the send_sigiotask hook in
789 * file_security_ops.
790 * @p contains the task_struct for process.
791 * @info contains the signal information.
792 * @sig contains the signal value.
793 * @secid contains the sid of the process where the signal originated
794 * Return 0 if permission is granted.
795 * @task_wait:
796 * Check permission before allowing a process to reap a child process @p
797 * and collect its status information.
798 * @p contains the task_struct for process.
799 * Return 0 if permission is granted.
800 * @task_prctl:
801 * Check permission before performing a process control operation on the
802 * current process.
803 * @option contains the operation.
804 * @arg2 contains a argument.
805 * @arg3 contains a argument.
806 * @arg4 contains a argument.
807 * @arg5 contains a argument.
808 * Return -ENOSYS if no-one wanted to handle this op, any other value to
809 * cause prctl() to return immediately with that value.
810 * @task_to_inode:
811 * Set the security attributes for an inode based on an associated task's
812 * security attributes, e.g. for /proc/pid inodes.
813 * @p contains the task_struct for the task.
814 * @inode contains the inode structure for the inode.
815 *
816 * Security hooks for Netlink messaging.
817 *
818 * @netlink_send:
819 * Save security information for a netlink message so that permission
820 * checking can be performed when the message is processed. The security
821 * information can be saved using the eff_cap field of the
822 * netlink_skb_parms structure. Also may be used to provide fine
823 * grained control over message transmission.
824 * @sk associated sock of task sending the message.
825 * @skb contains the sk_buff structure for the netlink message.
826 * Return 0 if the information was successfully saved and message
827 * is allowed to be transmitted.
828 *
829 * Security hooks for Unix domain networking.
830 *
831 * @unix_stream_connect:
832 * Check permissions before establishing a Unix domain stream connection
833 * between @sock and @other.
834 * @sock contains the sock structure.
835 * @other contains the peer sock structure.
836 * @newsk contains the new sock structure.
837 * Return 0 if permission is granted.
838 * @unix_may_send:
839 * Check permissions before connecting or sending datagrams from @sock to
840 * @other.
841 * @sock contains the socket structure.
842 * @other contains the peer socket structure.
843 * Return 0 if permission is granted.
844 *
845 * The @unix_stream_connect and @unix_may_send hooks were necessary because
846 * Linux provides an alternative to the conventional file name space for Unix
847 * domain sockets. Whereas binding and connecting to sockets in the file name
848 * space is mediated by the typical file permissions (and caught by the mknod
849 * and permission hooks in inode_security_ops), binding and connecting to
850 * sockets in the abstract name space is completely unmediated. Sufficient
851 * control of Unix domain sockets in the abstract name space isn't possible
852 * using only the socket layer hooks, since we need to know the actual target
853 * socket, which is not looked up until we are inside the af_unix code.
854 *
855 * Security hooks for socket operations.
856 *
857 * @socket_create:
858 * Check permissions prior to creating a new socket.
859 * @family contains the requested protocol family.
860 * @type contains the requested communications type.
861 * @protocol contains the requested protocol.
862 * @kern set to 1 if a kernel socket.
863 * Return 0 if permission is granted.
864 * @socket_post_create:
865 * This hook allows a module to update or allocate a per-socket security
866 * structure. Note that the security field was not added directly to the
867 * socket structure, but rather, the socket security information is stored
868 * in the associated inode. Typically, the inode alloc_security hook will
869 * allocate and and attach security information to
870 * sock->inode->i_security. This hook may be used to update the
871 * sock->inode->i_security field with additional information that wasn't
872 * available when the inode was allocated.
873 * @sock contains the newly created socket structure.
874 * @family contains the requested protocol family.
875 * @type contains the requested communications type.
876 * @protocol contains the requested protocol.
877 * @kern set to 1 if a kernel socket.
878 * @socket_bind:
879 * Check permission before socket protocol layer bind operation is
880 * performed and the socket @sock is bound to the address specified in the
881 * @address parameter.
882 * @sock contains the socket structure.
883 * @address contains the address to bind to.
884 * @addrlen contains the length of address.
885 * Return 0 if permission is granted.
886 * @socket_connect:
887 * Check permission before socket protocol layer connect operation
888 * attempts to connect socket @sock to a remote address, @address.
889 * @sock contains the socket structure.
890 * @address contains the address of remote endpoint.
891 * @addrlen contains the length of address.
892 * Return 0 if permission is granted.
893 * @socket_listen:
894 * Check permission before socket protocol layer listen operation.
895 * @sock contains the socket structure.
896 * @backlog contains the maximum length for the pending connection queue.
897 * Return 0 if permission is granted.
898 * @socket_accept:
899 * Check permission before accepting a new connection. Note that the new
900 * socket, @newsock, has been created and some information copied to it,
901 * but the accept operation has not actually been performed.
902 * @sock contains the listening socket structure.
903 * @newsock contains the newly created server socket for connection.
904 * Return 0 if permission is granted.
905 * @socket_sendmsg:
906 * Check permission before transmitting a message to another socket.
907 * @sock contains the socket structure.
908 * @msg contains the message to be transmitted.
909 * @size contains the size of message.
910 * Return 0 if permission is granted.
911 * @socket_recvmsg:
912 * Check permission before receiving a message from a socket.
913 * @sock contains the socket structure.
914 * @msg contains the message structure.
915 * @size contains the size of message structure.
916 * @flags contains the operational flags.
917 * Return 0 if permission is granted.
918 * @socket_getsockname:
919 * Check permission before the local address (name) of the socket object
920 * @sock is retrieved.
921 * @sock contains the socket structure.
922 * Return 0 if permission is granted.
923 * @socket_getpeername:
924 * Check permission before the remote address (name) of a socket object
925 * @sock is retrieved.
926 * @sock contains the socket structure.
927 * Return 0 if permission is granted.
928 * @socket_getsockopt:
929 * Check permissions before retrieving the options associated with socket
930 * @sock.
931 * @sock contains the socket structure.
932 * @level contains the protocol level to retrieve option from.
933 * @optname contains the name of option to retrieve.
934 * Return 0 if permission is granted.
935 * @socket_setsockopt:
936 * Check permissions before setting the options associated with socket
937 * @sock.
938 * @sock contains the socket structure.
939 * @level contains the protocol level to set options for.
940 * @optname contains the name of the option to set.
941 * Return 0 if permission is granted.
942 * @socket_shutdown:
943 * Checks permission before all or part of a connection on the socket
944 * @sock is shut down.
945 * @sock contains the socket structure.
946 * @how contains the flag indicating how future sends and receives are handled.
947 * Return 0 if permission is granted.
948 * @socket_sock_rcv_skb:
949 * Check permissions on incoming network packets. This hook is distinct
950 * from Netfilter's IP input hooks since it is the first time that the
951 * incoming sk_buff @skb has been associated with a particular socket, @sk.
952 * Must not sleep inside this hook because some callers hold spinlocks.
953 * @sk contains the sock (not socket) associated with the incoming sk_buff.
954 * @skb contains the incoming network data.
955 * @socket_getpeersec_stream:
956 * This hook allows the security module to provide peer socket security
957 * state for unix or connected tcp sockets to userspace via getsockopt
958 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
959 * socket is associated with an ipsec SA.
960 * @sock is the local socket.
961 * @optval userspace memory where the security state is to be copied.
962 * @optlen userspace int where the module should copy the actual length
963 * of the security state.
964 * @len as input is the maximum length to copy to userspace provided
965 * by the caller.
966 * Return 0 if all is well, otherwise, typical getsockopt return
967 * values.
968 * @socket_getpeersec_dgram:
969 * This hook allows the security module to provide peer socket security
970 * state for udp sockets on a per-packet basis to userspace via
971 * getsockopt SO_GETPEERSEC. The application must first have indicated
972 * the IP_PASSSEC option via getsockopt. It can then retrieve the
973 * security state returned by this hook for a packet via the SCM_SECURITY
974 * ancillary message type.
975 * @skb is the skbuff for the packet being queried
976 * @secdata is a pointer to a buffer in which to copy the security data
977 * @seclen is the maximum length for @secdata
978 * Return 0 on success, error on failure.
979 * @sk_alloc_security:
980 * Allocate and attach a security structure to the sk->sk_security field,
981 * which is used to copy security attributes between local stream sockets.
982 * @sk_free_security:
983 * Deallocate security structure.
984 * @sk_clone_security:
985 * Clone/copy security structure.
986 * @sk_getsecid:
987 * Retrieve the LSM-specific secid for the sock to enable caching of network
988 * authorizations.
989 * @sock_graft:
990 * Sets the socket's isec sid to the sock's sid.
991 * @inet_conn_request:
992 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
993 * @inet_csk_clone:
994 * Sets the new child socket's sid to the openreq sid.
995 * @inet_conn_established:
996 * Sets the connection's peersid to the secmark on skb.
997 * @secmark_relabel_packet:
998 * check if the process should be allowed to relabel packets to the given secid
999 * @security_secmark_refcount_inc
1000 * tells the LSM to increment the number of secmark labeling rules loaded
1001 * @security_secmark_refcount_dec
1002 * tells the LSM to decrement the number of secmark labeling rules loaded
1003 * @req_classify_flow:
1004 * Sets the flow's sid to the openreq sid.
1005 * @tun_dev_alloc_security:
1006 * This hook allows a module to allocate a security structure for a TUN
1007 * device.
1008 * @security pointer to a security structure pointer.
1009 * Returns a zero on success, negative values on failure.
1010 * @tun_dev_free_security:
1011 * This hook allows a module to free the security structure for a TUN
1012 * device.
1013 * @security pointer to the TUN device's security structure
1014 * @tun_dev_create:
1015 * Check permissions prior to creating a new TUN device.
1016 * @tun_dev_attach_queue:
1017 * Check permissions prior to attaching to a TUN device queue.
1018 * @security pointer to the TUN device's security structure.
1019 * @tun_dev_attach:
1020 * This hook can be used by the module to update any security state
1021 * associated with the TUN device's sock structure.
1022 * @sk contains the existing sock structure.
1023 * @security pointer to the TUN device's security structure.
1024 * @tun_dev_open:
1025 * This hook can be used by the module to update any security state
1026 * associated with the TUN device's security structure.
1027 * @security pointer to the TUN devices's security structure.
1028 * @skb_owned_by:
1029 * This hook sets the packet's owning sock.
1030 * @skb is the packet.
1031 * @sk the sock which owns the packet.
1032 *
1033 * Security hooks for XFRM operations.
1034 *
1035 * @xfrm_policy_alloc_security:
1036 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1037 * Database used by the XFRM system.
1038 * @sec_ctx contains the security context information being provided by
1039 * the user-level policy update program (e.g., setkey).
1040 * Allocate a security structure to the xp->security field; the security
1041 * field is initialized to NULL when the xfrm_policy is allocated.
1042 * Return 0 if operation was successful (memory to allocate, legal context)
1043 * @xfrm_policy_clone_security:
1044 * @old_ctx contains an existing xfrm_sec_ctx.
1045 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1046 * Allocate a security structure in new_ctxp that contains the
1047 * information from the old_ctx structure.
1048 * Return 0 if operation was successful (memory to allocate).
1049 * @xfrm_policy_free_security:
1050 * @ctx contains the xfrm_sec_ctx
1051 * Deallocate xp->security.
1052 * @xfrm_policy_delete_security:
1053 * @ctx contains the xfrm_sec_ctx.
1054 * Authorize deletion of xp->security.
1055 * @xfrm_state_alloc_security:
1056 * @x contains the xfrm_state being added to the Security Association
1057 * Database by the XFRM system.
1058 * @sec_ctx contains the security context information being provided by
1059 * the user-level SA generation program (e.g., setkey or racoon).
1060 * @secid contains the secid from which to take the mls portion of the context.
1061 * Allocate a security structure to the x->security field; the security
1062 * field is initialized to NULL when the xfrm_state is allocated. Set the
1063 * context to correspond to either sec_ctx or polsec, with the mls portion
1064 * taken from secid in the latter case.
1065 * Return 0 if operation was successful (memory to allocate, legal context).
1066 * @xfrm_state_free_security:
1067 * @x contains the xfrm_state.
1068 * Deallocate x->security.
1069 * @xfrm_state_delete_security:
1070 * @x contains the xfrm_state.
1071 * Authorize deletion of x->security.
1072 * @xfrm_policy_lookup:
1073 * @ctx contains the xfrm_sec_ctx for which the access control is being
1074 * checked.
1075 * @fl_secid contains the flow security label that is used to authorize
1076 * access to the policy xp.
1077 * @dir contains the direction of the flow (input or output).
1078 * Check permission when a flow selects a xfrm_policy for processing
1079 * XFRMs on a packet. The hook is called when selecting either a
1080 * per-socket policy or a generic xfrm policy.
1081 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1082 * on other errors.
1083 * @xfrm_state_pol_flow_match:
1084 * @x contains the state to match.
1085 * @xp contains the policy to check for a match.
1086 * @fl contains the flow to check for a match.
1087 * Return 1 if there is a match.
1088 * @xfrm_decode_session:
1089 * @skb points to skb to decode.
1090 * @secid points to the flow key secid to set.
1091 * @ckall says if all xfrms used should be checked for same secid.
1092 * Return 0 if ckall is zero or all xfrms used have the same secid.
1093 *
1094 * Security hooks affecting all Key Management operations
1095 *
1096 * @key_alloc:
1097 * Permit allocation of a key and assign security data. Note that key does
1098 * not have a serial number assigned at this point.
1099 * @key points to the key.
1100 * @flags is the allocation flags
1101 * Return 0 if permission is granted, -ve error otherwise.
1102 * @key_free:
1103 * Notification of destruction; free security data.
1104 * @key points to the key.
1105 * No return value.
1106 * @key_permission:
1107 * See whether a specific operational right is granted to a process on a
1108 * key.
1109 * @key_ref refers to the key (key pointer + possession attribute bit).
1110 * @cred points to the credentials to provide the context against which to
1111 * evaluate the security data on the key.
1112 * @perm describes the combination of permissions required of this key.
1113 * Return 0 if permission is granted, -ve error otherwise.
1114 * @key_getsecurity:
1115 * Get a textual representation of the security context attached to a key
1116 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1117 * allocates the storage for the NUL-terminated string and the caller
1118 * should free it.
1119 * @key points to the key to be queried.
1120 * @_buffer points to a pointer that should be set to point to the
1121 * resulting string (if no label or an error occurs).
1122 * Return the length of the string (including terminating NUL) or -ve if
1123 * an error.
1124 * May also return 0 (and a NULL buffer pointer) if there is no label.
1125 *
1126 * Security hooks affecting all System V IPC operations.
1127 *
1128 * @ipc_permission:
1129 * Check permissions for access to IPC
1130 * @ipcp contains the kernel IPC permission structure
1131 * @flag contains the desired (requested) permission set
1132 * Return 0 if permission is granted.
1133 * @ipc_getsecid:
1134 * Get the secid associated with the ipc object.
1135 * @ipcp contains the kernel IPC permission structure.
1136 * @secid contains a pointer to the location where result will be saved.
1137 * In case of failure, @secid will be set to zero.
1138 *
1139 * Security hooks for individual messages held in System V IPC message queues
1140 * @msg_msg_alloc_security:
1141 * Allocate and attach a security structure to the msg->security field.
1142 * The security field is initialized to NULL when the structure is first
1143 * created.
1144 * @msg contains the message structure to be modified.
1145 * Return 0 if operation was successful and permission is granted.
1146 * @msg_msg_free_security:
1147 * Deallocate the security structure for this message.
1148 * @msg contains the message structure to be modified.
1149 *
1150 * Security hooks for System V IPC Message Queues
1151 *
1152 * @msg_queue_alloc_security:
1153 * Allocate and attach a security structure to the
1154 * msq->q_perm.security field. The security field is initialized to
1155 * NULL when the structure is first created.
1156 * @msq contains the message queue structure to be modified.
1157 * Return 0 if operation was successful and permission is granted.
1158 * @msg_queue_free_security:
1159 * Deallocate security structure for this message queue.
1160 * @msq contains the message queue structure to be modified.
1161 * @msg_queue_associate:
1162 * Check permission when a message queue is requested through the
1163 * msgget system call. This hook is only called when returning the
1164 * message queue identifier for an existing message queue, not when a
1165 * new message queue is created.
1166 * @msq contains the message queue to act upon.
1167 * @msqflg contains the operation control flags.
1168 * Return 0 if permission is granted.
1169 * @msg_queue_msgctl:
1170 * Check permission when a message control operation specified by @cmd
1171 * is to be performed on the message queue @msq.
1172 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1173 * @msq contains the message queue to act upon. May be NULL.
1174 * @cmd contains the operation to be performed.
1175 * Return 0 if permission is granted.
1176 * @msg_queue_msgsnd:
1177 * Check permission before a message, @msg, is enqueued on the message
1178 * queue, @msq.
1179 * @msq contains the message queue to send message to.
1180 * @msg contains the message to be enqueued.
1181 * @msqflg contains operational flags.
1182 * Return 0 if permission is granted.
1183 * @msg_queue_msgrcv:
1184 * Check permission before a message, @msg, is removed from the message
1185 * queue, @msq. The @target task structure contains a pointer to the
1186 * process that will be receiving the message (not equal to the current
1187 * process when inline receives are being performed).
1188 * @msq contains the message queue to retrieve message from.
1189 * @msg contains the message destination.
1190 * @target contains the task structure for recipient process.
1191 * @type contains the type of message requested.
1192 * @mode contains the operational flags.
1193 * Return 0 if permission is granted.
1194 *
1195 * Security hooks for System V Shared Memory Segments
1196 *
1197 * @shm_alloc_security:
1198 * Allocate and attach a security structure to the shp->shm_perm.security
1199 * field. The security field is initialized to NULL when the structure is
1200 * first created.
1201 * @shp contains the shared memory structure to be modified.
1202 * Return 0 if operation was successful and permission is granted.
1203 * @shm_free_security:
1204 * Deallocate the security struct for this memory segment.
1205 * @shp contains the shared memory structure to be modified.
1206 * @shm_associate:
1207 * Check permission when a shared memory region is requested through the
1208 * shmget system call. This hook is only called when returning the shared
1209 * memory region identifier for an existing region, not when a new shared
1210 * memory region is created.
1211 * @shp contains the shared memory structure to be modified.
1212 * @shmflg contains the operation control flags.
1213 * Return 0 if permission is granted.
1214 * @shm_shmctl:
1215 * Check permission when a shared memory control operation specified by
1216 * @cmd is to be performed on the shared memory region @shp.
1217 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1218 * @shp contains shared memory structure to be modified.
1219 * @cmd contains the operation to be performed.
1220 * Return 0 if permission is granted.
1221 * @shm_shmat:
1222 * Check permissions prior to allowing the shmat system call to attach the
1223 * shared memory segment @shp to the data segment of the calling process.
1224 * The attaching address is specified by @shmaddr.
1225 * @shp contains the shared memory structure to be modified.
1226 * @shmaddr contains the address to attach memory region to.
1227 * @shmflg contains the operational flags.
1228 * Return 0 if permission is granted.
1229 *
1230 * Security hooks for System V Semaphores
1231 *
1232 * @sem_alloc_security:
1233 * Allocate and attach a security structure to the sma->sem_perm.security
1234 * field. The security field is initialized to NULL when the structure is
1235 * first created.
1236 * @sma contains the semaphore structure
1237 * Return 0 if operation was successful and permission is granted.
1238 * @sem_free_security:
1239 * deallocate security struct for this semaphore
1240 * @sma contains the semaphore structure.
1241 * @sem_associate:
1242 * Check permission when a semaphore is requested through the semget
1243 * system call. This hook is only called when returning the semaphore
1244 * identifier for an existing semaphore, not when a new one must be
1245 * created.
1246 * @sma contains the semaphore structure.
1247 * @semflg contains the operation control flags.
1248 * Return 0 if permission is granted.
1249 * @sem_semctl:
1250 * Check permission when a semaphore operation specified by @cmd is to be
1251 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1252 * IPC_INFO or SEM_INFO.
1253 * @sma contains the semaphore structure. May be NULL.
1254 * @cmd contains the operation to be performed.
1255 * Return 0 if permission is granted.
1256 * @sem_semop
1257 * Check permissions before performing operations on members of the
1258 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1259 * may be modified.
1260 * @sma contains the semaphore structure.
1261 * @sops contains the operations to perform.
1262 * @nsops contains the number of operations to perform.
1263 * @alter contains the flag indicating whether changes are to be made.
1264 * Return 0 if permission is granted.
1265 *
1266 * @ptrace_access_check:
1267 * Check permission before allowing the current process to trace the
1268 * @child process.
1269 * Security modules may also want to perform a process tracing check
1270 * during an execve in the set_security or apply_creds hooks of
1271 * tracing check during an execve in the bprm_set_creds hook of
1272 * binprm_security_ops if the process is being traced and its security
1273 * attributes would be changed by the execve.
1274 * @child contains the task_struct structure for the target process.
1275 * @mode contains the PTRACE_MODE flags indicating the form of access.
1276 * Return 0 if permission is granted.
1277 * @ptrace_traceme:
1278 * Check that the @parent process has sufficient permission to trace the
1279 * current process before allowing the current process to present itself
1280 * to the @parent process for tracing.
1281 * @parent contains the task_struct structure for debugger process.
1282 * Return 0 if permission is granted.
1283 * @capget:
1284 * Get the @effective, @inheritable, and @permitted capability sets for
1285 * the @target process. The hook may also perform permission checking to
1286 * determine if the current process is allowed to see the capability sets
1287 * of the @target process.
1288 * @target contains the task_struct structure for target process.
1289 * @effective contains the effective capability set.
1290 * @inheritable contains the inheritable capability set.
1291 * @permitted contains the permitted capability set.
1292 * Return 0 if the capability sets were successfully obtained.
1293 * @capset:
1294 * Set the @effective, @inheritable, and @permitted capability sets for
1295 * the current process.
1296 * @new contains the new credentials structure for target process.
1297 * @old contains the current credentials structure for target process.
1298 * @effective contains the effective capability set.
1299 * @inheritable contains the inheritable capability set.
1300 * @permitted contains the permitted capability set.
1301 * Return 0 and update @new if permission is granted.
1302 * @capable:
1303 * Check whether the @tsk process has the @cap capability in the indicated
1304 * credentials.
1305 * @cred contains the credentials to use.
1306 * @ns contains the user namespace we want the capability in
1307 * @cap contains the capability <include/linux/capability.h>.
1308 * @audit: Whether to write an audit message or not
1309 * Return 0 if the capability is granted for @tsk.
1310 * @syslog:
1311 * Check permission before accessing the kernel message ring or changing
1312 * logging to the console.
1313 * See the syslog(2) manual page for an explanation of the @type values.
1314 * @type contains the type of action.
1315 * @from_file indicates the context of action (if it came from /proc).
1316 * Return 0 if permission is granted.
1317 * @settime:
1318 * Check permission to change the system time.
1319 * struct timespec and timezone are defined in include/linux/time.h
1320 * @ts contains new time
1321 * @tz contains new timezone
1322 * Return 0 if permission is granted.
1323 * @vm_enough_memory:
1324 * Check permissions for allocating a new virtual mapping.
1325 * @mm contains the mm struct it is being added to.
1326 * @pages contains the number of pages.
1327 * Return 0 if permission is granted.
1328 *
1329 * @ismaclabel:
1330 * Check if the extended attribute specified by @name
1331 * represents a MAC label. Returns 1 if name is a MAC
1332 * attribute otherwise returns 0.
1333 * @name full extended attribute name to check against
1334 * LSM as a MAC label.
1335 *
1336 * @secid_to_secctx:
1337 * Convert secid to security context. If secdata is NULL the length of
1338 * the result will be returned in seclen, but no secdata will be returned.
1339 * This does mean that the length could change between calls to check the
1340 * length and the next call which actually allocates and returns the secdata.
1341 * @secid contains the security ID.
1342 * @secdata contains the pointer that stores the converted security context.
1343 * @seclen pointer which contains the length of the data
1344 * @secctx_to_secid:
1345 * Convert security context to secid.
1346 * @secid contains the pointer to the generated security ID.
1347 * @secdata contains the security context.
1348 *
1349 * @release_secctx:
1350 * Release the security context.
1351 * @secdata contains the security context.
1352 * @seclen contains the length of the security context.
1353 *
1354 * Security hooks for Audit
1355 *
1356 * @audit_rule_init:
1357 * Allocate and initialize an LSM audit rule structure.
1358 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1359 * @op contains the operator the rule uses.
1360 * @rulestr contains the context where the rule will be applied to.
1361 * @lsmrule contains a pointer to receive the result.
1362 * Return 0 if @lsmrule has been successfully set,
1363 * -EINVAL in case of an invalid rule.
1364 *
1365 * @audit_rule_known:
1366 * Specifies whether given @rule contains any fields related to current LSM.
1367 * @rule contains the audit rule of interest.
1368 * Return 1 in case of relation found, 0 otherwise.
1369 *
1370 * @audit_rule_match:
1371 * Determine if given @secid matches a rule previously approved
1372 * by @audit_rule_known.
1373 * @secid contains the security id in question.
1374 * @field contains the field which relates to current LSM.
1375 * @op contains the operator that will be used for matching.
1376 * @rule points to the audit rule that will be checked against.
1377 * @actx points to the audit context associated with the check.
1378 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1379 *
1380 * @audit_rule_free:
1381 * Deallocate the LSM audit rule structure previously allocated by
1382 * audit_rule_init.
1383 * @rule contains the allocated rule
1384 *
1385 * @inode_notifysecctx:
1386 * Notify the security module of what the security context of an inode
1387 * should be. Initializes the incore security context managed by the
1388 * security module for this inode. Example usage: NFS client invokes
1389 * this hook to initialize the security context in its incore inode to the
1390 * value provided by the server for the file when the server returned the
1391 * file's attributes to the client.
1392 *
1393 * Must be called with inode->i_mutex locked.
1394 *
1395 * @inode we wish to set the security context of.
1396 * @ctx contains the string which we wish to set in the inode.
1397 * @ctxlen contains the length of @ctx.
1398 *
1399 * @inode_setsecctx:
1400 * Change the security context of an inode. Updates the
1401 * incore security context managed by the security module and invokes the
1402 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1403 * xattrs that represent the context. Example usage: NFS server invokes
1404 * this hook to change the security context in its incore inode and on the
1405 * backing filesystem to a value provided by the client on a SETATTR
1406 * operation.
1407 *
1408 * Must be called with inode->i_mutex locked.
1409 *
1410 * @dentry contains the inode we wish to set the security context of.
1411 * @ctx contains the string which we wish to set in the inode.
1412 * @ctxlen contains the length of @ctx.
1413 *
1414 * @inode_getsecctx:
1415 * On success, returns 0 and fills out @ctx and @ctxlen with the security
1416 * context for the given @inode.
1417 *
1418 * @inode we wish to get the security context of.
1419 * @ctx is a pointer in which to place the allocated security context.
1420 * @ctxlen points to the place to put the length of @ctx.
1421 * This is the main security structure.
1422 */
1474 #ifdef CONFIG_SECURITY_PATH
1490 #endif
1524 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1525 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1555 gfp_t gfp);
1629 #ifdef CONFIG_SECURITY_NETWORK
1652 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1676 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1679 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1684 u32 secid);
1694 /* key management security hooks */
1695 #ifdef CONFIG_KEYS
1700 key_perm_t perm);
1704 #ifdef CONFIG_AUDIT
1711 };
1713 /* prototypes */
1720 /* Security operations */
1800 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1801 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1887 };
1890 {
1891 }
1894 {
1895 }
1897 /*
1898 * This is the default capabilities functionality. Most of these functions
1899 * are just stubbed out, but a few must call the proper capable code.
1900 */
1903 {
1905 }
1909 {
1911 }
1914 {
1916 }
1922 {
1924 }
1931 {
1933 }
1937 {
1939 }
1944 }
1948 {
1950 }
1953 {
1955 }
1958 {
1960 }
1964 {
1966 }
1969 {
1971 }
1974 {
1976 }
1979 {
1981 }
1984 {
1985 }
1988 {
1989 }
1992 {
1994 }
1997 {
1999 }
2002 { }
2005 {
2007 }
2010 {
2012 }
2015 {
2017 }
2021 {
2023 }
2026 {
2028 }
2033 {
2035 }
2038 {
2040 }
2044 {
2046 }
2052 {
2054 }
2058 {
2060 }
2063 {
2065 }
2068 {
2070 }
2073 { }
2080 {
2082 }
2090 {
2092 }
2099 {
2101 }
2105 umode_t mode)
2106 {
2108 }
2113 {
2115 }
2119 {
2121 }
2126 {
2128 }
2133 {
2135 }
2139 {
2141 }
2146 {
2148 }
2154 {
2156 }
2159 {
2161 }
2165 {
2167 }
2170 {
2172 }
2176 {
2178 }
2182 {
2184 }
2188 {
2190 }
2194 { }
2198 {
2200 }
2203 {
2205 }
2209 {
2211 }
2214 {
2216 }
2219 {
2221 }
2223 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2224 {
2226 }
2228 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2229 {
2231 }
2233 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2234 {
2236 }
2239 {
2241 }
2244 {
2246 }
2249 {
2251 }
2254 { }
2258 {
2260 }
2264 {
2266 }
2269 {
2271 }
2276 {
2278 }
2281 {
2283 }
2287 {
2289 }
2292 {
2294 }
2299 {
2301 }
2304 {
2306 }
2310 {
2312 }
2315 {
2317 }
2320 { }
2323 {
2325 }
2328 { }
2332 gfp_t gfp)
2333 {
2335 }
2339 {
2340 }
2343 {
2345 }
2349 {
2351 }
2354 {
2356 }
2359 {
2361 }
2366 {
2368 }
2371 {
2373 }
2376 {
2378 }
2381 {
2383 }
2386 {
2388 }
2391 {
2393 }
2396 {
2398 }
2401 {
2403 }
2408 {
2410 }
2413 {
2415 }
2418 {
2420 }
2423 {
2425 }
2429 u32 secid)
2430 {
2432 }
2435 {
2437 }
2443 {
2445 }
2448 { }
2452 {
2454 }
2457 {
2459 }
2462 {
2464 }
2467 { }
2470 {
2472 }
2475 { }
2479 {
2481 }
2484 {
2486 }
2490 {
2492 }
2498 {
2500 }
2503 {
2505 }
2508 { }
2512 {
2514 }
2517 {
2519 }
2523 {
2525 }
2528 {
2530 }
2533 { }
2536 {
2538 }
2541 {
2543 }
2548 {
2550 }
2553 { }
2556 {
2558 }
2560 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2561 {
2563 }
2566 {
2568 }
2571 {
2573 }
2576 {
2578 }
2581 u32 seclen,
2583 {
2585 }
2588 {
2589 }
2592 {
2594 }
2596 {
2598 }
2600 {
2602 }
2605 #ifdef CONFIG_SECURITY_NETWORK
2656 {
2658 }
2662 {
2664 }
2668 {
2670 }
2676 {
2678 }
2683 {
2685 }
2690 {
2692 }
2695 {
2697 }
2701 {
2703 }
2707 {
2709 }
2714 {
2716 }
2719 {
2721 }
2724 {
2726 }
2730 {
2732 }
2736 {
2738 }
2741 {
2743 }
2746 {
2748 }
2752 {
2754 }
2756 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2757 {
2759 }
2762 {
2764 }
2767 {
2768 }
2771 {
2772 }
2775 {
2776 }
2778 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2779 {
2780 }
2783 {
2784 }
2788 {
2790 }
2794 {
2795 }
2799 {
2800 }
2803 {
2805 }
2808 {
2809 }
2812 {
2813 }
2816 {
2818 }
2821 {
2822 }
2825 {
2827 }
2830 {
2832 }
2835 {
2837 }
2840 {
2842 }
2845 {
2846 }
2850 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2870 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2871 {
2873 }
2875 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2876 {
2878 }
2881 {
2882 }
2885 {
2887 }
2891 {
2893 }
2897 {
2899 }
2902 {
2903 }
2906 {
2908 }
2911 {
2913 }
2917 {
2919 }
2922 {
2924 }
2927 {
2928 }
2932 #ifdef CONFIG_SECURITY_PATH
2950 {
2952 }
2955 umode_t mode)
2956 {
2958 }
2961 {
2963 }
2967 {
2969 }
2972 {
2974 }
2978 {
2980 }
2985 {
2987 }
2993 {
2995 }
2998 {
3000 }
3003 {
3005 }
3008 {
3010 }
3013 #ifdef CONFIG_KEYS
3014 #ifdef CONFIG_SECURITY
3022 #else
3027 {
3029 }
3032 {
3033 }
3037 key_perm_t perm)
3038 {
3040 }
3043 {
3046 }
3048 #endif
3051 #ifdef CONFIG_AUDIT
3052 #ifdef CONFIG_SECURITY
3059 #else
3063 {
3065 }
3068 {
3070 }
3074 {
3076 }
3079 { }
3084 #ifdef CONFIG_SECURITYFS
3096 {
3098 }
3101 umode_t mode,
3105 {
3107 }
3110 {}
3112 #endif
3114 #ifdef CONFIG_SECURITY
3117 {
3119 }
3122 {
3124 }
3126 #else
3129 {
3131 }
3134 { }
3137 #ifdef CONFIG_SECURITY_YAMA
3144 #else
3147 {
3149 }
3152 {
3154 }
3157 {
3158 }
3163 {
3165 }