| blob | 83c18e8c846d399832c5ab3ab2e5500286b26186 |
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/fs.h>
26 #include <linux/fsnotify.h>
27 #include <linux/binfmts.h>
28 #include <linux/dcache.h>
29 #include <linux/signal.h>
30 #include <linux/resource.h>
31 #include <linux/sem.h>
32 #include <linux/shm.h>
34 #include <linux/msg.h>
35 #include <linux/sched.h>
36 #include <linux/key.h>
37 #include <linux/xfrm.h>
38 #include <linux/slab.h>
39 #include <linux/xattr.h>
40 #include <net/flow.h>
42 /* Maximum number of letters for an LSM name string */
43 #define SECURITY_NAME_MAX 10
45 /* If capable should audit the security request */
46 #define SECURITY_CAP_NOAUDIT 0
47 #define SECURITY_CAP_AUDIT 1
53 /*
54 * These functions are in security/capability.c and are used
55 * as the default capabilities functions
56 */
62 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
102 #ifdef CONFIG_MMU
105 #else
106 #define dac_mmap_min_addr 0UL
107 #endif
109 /*
110 * Values used in the task_security_ops calls
111 */
112 /* setuid or setgid, id0 == uid or gid */
113 #define LSM_SETID_ID 1
115 /* setreuid or setregid, id0 == real, id1 == eff */
116 #define LSM_SETID_RE 2
118 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
119 #define LSM_SETID_RES 4
121 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
122 #define LSM_SETID_FS 8
124 /* forward declares to avoid warnings */
128 /* bprm->unsafe reasons */
129 #define LSM_UNSAFE_SHARE 1
130 #define LSM_UNSAFE_PTRACE 2
131 #define LSM_UNSAFE_PTRACE_CAP 4
133 #ifdef CONFIG_MMU
134 /*
135 * If a hint addr is less than mmap_min_addr change hint to be as
136 * low as possible but still greater than mmap_min_addr
137 */
139 {
145 }
148 #endif
150 /* security_inode_init_security callback function to write xattrs */
154 #ifdef CONFIG_SECURITY
160 };
163 {
167 }
170 {
180 }
182 /**
183 * struct security_operations - main security structure
184 *
185 * Security module identifier.
186 *
187 * @name:
188 * A string that acts as a unique identifier for the LSM with max number
189 * of characters = SECURITY_NAME_MAX.
190 *
191 * Security hooks for program execution operations.
192 *
193 * @bprm_set_creds:
194 * Save security information in the bprm->security field, typically based
195 * on information about the bprm->file, for later use by the apply_creds
196 * hook. This hook may also optionally check permissions (e.g. for
197 * transitions between security domains).
198 * This hook may be called multiple times during a single execve, e.g. for
199 * interpreters. The hook can tell whether it has already been called by
200 * checking to see if @bprm->security is non-NULL. If so, then the hook
201 * may decide either to retain the security information saved earlier or
202 * to replace it.
203 * @bprm contains the linux_binprm structure.
204 * Return 0 if the hook is successful and permission is granted.
205 * @bprm_check_security:
206 * This hook mediates the point when a search for a binary handler will
207 * begin. It allows a check the @bprm->security value which is set in the
208 * preceding set_creds call. The primary difference from set_creds is
209 * that the argv list and envp list are reliably available in @bprm. This
210 * hook may be called multiple times during a single execve; and in each
211 * pass set_creds is called first.
212 * @bprm contains the linux_binprm structure.
213 * Return 0 if the hook is successful and permission is granted.
214 * @bprm_committing_creds:
215 * Prepare to install the new security attributes of a process being
216 * transformed by an execve operation, based on the old credentials
217 * pointed to by @current->cred and the information set in @bprm->cred by
218 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
219 * This hook is a good place to perform state changes on the process such
220 * as closing open file descriptors to which access will no longer be
221 * granted when the attributes are changed. This is called immediately
222 * before commit_creds().
223 * @bprm_committed_creds:
224 * Tidy up after the installation of the new security attributes of a
225 * process being transformed by an execve operation. The new credentials
226 * have, by this point, been set to @current->cred. @bprm points to the
227 * linux_binprm structure. This hook is a good place to perform state
228 * changes on the process such as clearing out non-inheritable signal
229 * state. This is called immediately after commit_creds().
230 * @bprm_secureexec:
231 * Return a boolean value (0 or 1) indicating whether a "secure exec"
232 * is required. The flag is passed in the auxiliary table
233 * on the initial stack to the ELF interpreter to indicate whether libc
234 * should enable secure mode.
235 * @bprm contains the linux_binprm structure.
236 *
237 * Security hooks for filesystem operations.
238 *
239 * @sb_alloc_security:
240 * Allocate and attach a security structure to the sb->s_security field.
241 * The s_security field is initialized to NULL when the structure is
242 * allocated.
243 * @sb contains the super_block structure to be modified.
244 * Return 0 if operation was successful.
245 * @sb_free_security:
246 * Deallocate and clear the sb->s_security field.
247 * @sb contains the super_block structure to be modified.
248 * @sb_statfs:
249 * Check permission before obtaining filesystem statistics for the @mnt
250 * mountpoint.
251 * @dentry is a handle on the superblock for the filesystem.
252 * Return 0 if permission is granted.
253 * @sb_mount:
254 * Check permission before an object specified by @dev_name is mounted on
255 * the mount point named by @nd. For an ordinary mount, @dev_name
256 * identifies a device if the file system type requires a device. For a
257 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
258 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
259 * pathname of the object being mounted.
260 * @dev_name contains the name for object being mounted.
261 * @path contains the path for mount point object.
262 * @type contains the filesystem type.
263 * @flags contains the mount flags.
264 * @data contains the filesystem-specific data.
265 * Return 0 if permission is granted.
266 * @sb_copy_data:
267 * Allow mount option data to be copied prior to parsing by the filesystem,
268 * so that the security module can extract security-specific mount
269 * options cleanly (a filesystem may modify the data e.g. with strsep()).
270 * This also allows the original mount data to be stripped of security-
271 * specific options to avoid having to make filesystems aware of them.
272 * @type the type of filesystem being mounted.
273 * @orig the original mount data copied from userspace.
274 * @copy copied data which will be passed to the security module.
275 * Returns 0 if the copy was successful.
276 * @sb_remount:
277 * Extracts security system specific mount options and verifies no changes
278 * are being made to those options.
279 * @sb superblock being remounted
280 * @data contains the filesystem-specific data.
281 * Return 0 if permission is granted.
282 * @sb_umount:
283 * Check permission before the @mnt file system is unmounted.
284 * @mnt contains the mounted file system.
285 * @flags contains the unmount flags, e.g. MNT_FORCE.
286 * Return 0 if permission is granted.
287 * @sb_pivotroot:
288 * Check permission before pivoting the root filesystem.
289 * @old_path contains the path for the new location of the current root (put_old).
290 * @new_path contains the path for the new root (new_root).
291 * Return 0 if permission is granted.
292 * @sb_set_mnt_opts:
293 * Set the security relevant mount options used for a superblock
294 * @sb the superblock to set security mount options for
295 * @opts binary data structure containing all lsm mount data
296 * @sb_clone_mnt_opts:
297 * Copy all security options from a given superblock to another
298 * @oldsb old superblock which contain information to clone
299 * @newsb new superblock which needs filled in
300 * @sb_parse_opts_str:
301 * Parse a string of security data filling in the opts structure
302 * @options string containing all mount options known by the LSM
303 * @opts binary data structure usable by the LSM
304 *
305 * Security hooks for inode operations.
306 *
307 * @inode_alloc_security:
308 * Allocate and attach a security structure to @inode->i_security. The
309 * i_security field is initialized to NULL when the inode structure is
310 * allocated.
311 * @inode contains the inode structure.
312 * Return 0 if operation was successful.
313 * @inode_free_security:
314 * @inode contains the inode structure.
315 * Deallocate the inode security structure and set @inode->i_security to
316 * NULL.
317 * @inode_init_security:
318 * Obtain the security attribute name suffix and value to set on a newly
319 * created inode and set up the incore security field for the new inode.
320 * This hook is called by the fs code as part of the inode creation
321 * transaction and provides for atomic labeling of the inode, unlike
322 * the post_create/mkdir/... hooks called by the VFS. The hook function
323 * is expected to allocate the name and value via kmalloc, with the caller
324 * being responsible for calling kfree after using them.
325 * If the security module does not use security attributes or does
326 * not wish to put a security attribute on this particular inode,
327 * then it should return -EOPNOTSUPP to skip this processing.
328 * @inode contains the inode structure of the newly created inode.
329 * @dir contains the inode structure of the parent directory.
330 * @qstr contains the last path component of the new object
331 * @name will be set to the allocated name suffix (e.g. selinux).
332 * @value will be set to the allocated attribute value.
333 * @len will be set to the length of the value.
334 * Returns 0 if @name and @value have been successfully set,
335 * -EOPNOTSUPP if no security attribute is needed, or
336 * -ENOMEM on memory allocation failure.
337 * @inode_create:
338 * Check permission to create a regular file.
339 * @dir contains inode structure of the parent of the new file.
340 * @dentry contains the dentry structure for the file to be created.
341 * @mode contains the file mode of the file to be created.
342 * Return 0 if permission is granted.
343 * @inode_link:
344 * Check permission before creating a new hard link to a file.
345 * @old_dentry contains the dentry structure for an existing link to the file.
346 * @dir contains the inode structure of the parent directory of the new link.
347 * @new_dentry contains the dentry structure for the new link.
348 * Return 0 if permission is granted.
349 * @path_link:
350 * Check permission before creating a new hard link to a file.
351 * @old_dentry contains the dentry structure for an existing link
352 * to the file.
353 * @new_dir contains the path structure of the parent directory of
354 * the new link.
355 * @new_dentry contains the dentry structure for the new link.
356 * Return 0 if permission is granted.
357 * @inode_unlink:
358 * Check the permission to remove a hard link to a file.
359 * @dir contains the inode structure of parent directory of the file.
360 * @dentry contains the dentry structure for file to be unlinked.
361 * Return 0 if permission is granted.
362 * @path_unlink:
363 * Check the permission to remove a hard link to a file.
364 * @dir contains the path structure of parent directory of the file.
365 * @dentry contains the dentry structure for file to be unlinked.
366 * Return 0 if permission is granted.
367 * @inode_symlink:
368 * Check the permission to create a symbolic link to a file.
369 * @dir contains the inode structure of parent directory of the symbolic link.
370 * @dentry contains the dentry structure of the symbolic link.
371 * @old_name contains the pathname of file.
372 * Return 0 if permission is granted.
373 * @path_symlink:
374 * Check the permission to create a symbolic link to a file.
375 * @dir contains the path structure of parent directory of
376 * the symbolic link.
377 * @dentry contains the dentry structure of the symbolic link.
378 * @old_name contains the pathname of file.
379 * Return 0 if permission is granted.
380 * @inode_mkdir:
381 * Check permissions to create a new directory in the existing directory
382 * associated with inode structure @dir.
383 * @dir contains the inode structure of parent of the directory to be created.
384 * @dentry contains the dentry structure of new directory.
385 * @mode contains the mode of new directory.
386 * Return 0 if permission is granted.
387 * @path_mkdir:
388 * Check permissions to create a new directory in the existing directory
389 * associated with path structure @path.
390 * @dir contains the path structure of parent of the directory
391 * to be created.
392 * @dentry contains the dentry structure of new directory.
393 * @mode contains the mode of new directory.
394 * Return 0 if permission is granted.
395 * @inode_rmdir:
396 * Check the permission to remove a directory.
397 * @dir contains the inode structure of parent of the directory to be removed.
398 * @dentry contains the dentry structure of directory to be removed.
399 * Return 0 if permission is granted.
400 * @path_rmdir:
401 * Check the permission to remove a directory.
402 * @dir contains the path structure of parent of the directory to be
403 * removed.
404 * @dentry contains the dentry structure of directory to be removed.
405 * Return 0 if permission is granted.
406 * @inode_mknod:
407 * Check permissions when creating a special file (or a socket or a fifo
408 * file created via the mknod system call). Note that if mknod operation
409 * is being done for a regular file, then the create hook will be called
410 * and not this hook.
411 * @dir contains the inode structure of parent of the new file.
412 * @dentry contains the dentry structure of the new file.
413 * @mode contains the mode of the new file.
414 * @dev contains the device number.
415 * Return 0 if permission is granted.
416 * @path_mknod:
417 * Check permissions when creating a file. Note that this hook is called
418 * even if mknod operation is being done for a regular file.
419 * @dir contains the path structure of parent of the new file.
420 * @dentry contains the dentry structure of the new file.
421 * @mode contains the mode of the new file.
422 * @dev contains the undecoded device number. Use new_decode_dev() to get
423 * the decoded device number.
424 * Return 0 if permission is granted.
425 * @inode_rename:
426 * Check for permission to rename a file or directory.
427 * @old_dir contains the inode structure for parent of the old link.
428 * @old_dentry contains the dentry structure of the old link.
429 * @new_dir contains the inode structure for parent of the new link.
430 * @new_dentry contains the dentry structure of the new link.
431 * Return 0 if permission is granted.
432 * @path_rename:
433 * Check for permission to rename a file or directory.
434 * @old_dir contains the path structure for parent of the old link.
435 * @old_dentry contains the dentry structure of the old link.
436 * @new_dir contains the path structure for parent of the new link.
437 * @new_dentry contains the dentry structure of the new link.
438 * Return 0 if permission is granted.
439 * @path_chmod:
440 * Check for permission to change DAC's permission of a file or directory.
441 * @dentry contains the dentry structure.
442 * @mnt contains the vfsmnt structure.
443 * @mode contains DAC's mode.
444 * Return 0 if permission is granted.
445 * @path_chown:
446 * Check for permission to change owner/group of a file or directory.
447 * @path contains the path structure.
448 * @uid contains new owner's ID.
449 * @gid contains new group's ID.
450 * Return 0 if permission is granted.
451 * @path_chroot:
452 * Check for permission to change root directory.
453 * @path contains the path structure.
454 * Return 0 if permission is granted.
455 * @inode_readlink:
456 * Check the permission to read the symbolic link.
457 * @dentry contains the dentry structure for the file link.
458 * Return 0 if permission is granted.
459 * @inode_follow_link:
460 * Check permission to follow a symbolic link when looking up a pathname.
461 * @dentry contains the dentry structure for the link.
462 * @nd contains the nameidata structure for the parent directory.
463 * Return 0 if permission is granted.
464 * @inode_permission:
465 * Check permission before accessing an inode. This hook is called by the
466 * existing Linux permission function, so a security module can use it to
467 * provide additional checking for existing Linux permission checks.
468 * Notice that this hook is called when a file is opened (as well as many
469 * other operations), whereas the file_security_ops permission hook is
470 * called when the actual read/write operations are performed.
471 * @inode contains the inode structure to check.
472 * @mask contains the permission mask.
473 * Return 0 if permission is granted.
474 * @inode_setattr:
475 * Check permission before setting file attributes. Note that the kernel
476 * call to notify_change is performed from several locations, whenever
477 * file attributes change (such as when a file is truncated, chown/chmod
478 * operations, transferring disk quotas, etc).
479 * @dentry contains the dentry structure for the file.
480 * @attr is the iattr structure containing the new file attributes.
481 * Return 0 if permission is granted.
482 * @path_truncate:
483 * Check permission before truncating a file.
484 * @path contains the path structure for the file.
485 * Return 0 if permission is granted.
486 * @inode_getattr:
487 * Check permission before obtaining file attributes.
488 * @mnt is the vfsmount where the dentry was looked up
489 * @dentry contains the dentry structure for the file.
490 * Return 0 if permission is granted.
491 * @inode_setxattr:
492 * Check permission before setting the extended attributes
493 * @value identified by @name for @dentry.
494 * Return 0 if permission is granted.
495 * @inode_post_setxattr:
496 * Update inode security field after successful setxattr operation.
497 * @value identified by @name for @dentry.
498 * @inode_getxattr:
499 * Check permission before obtaining the extended attributes
500 * identified by @name for @dentry.
501 * Return 0 if permission is granted.
502 * @inode_listxattr:
503 * Check permission before obtaining the list of extended attribute
504 * names for @dentry.
505 * Return 0 if permission is granted.
506 * @inode_removexattr:
507 * Check permission before removing the extended attribute
508 * identified by @name for @dentry.
509 * Return 0 if permission is granted.
510 * @inode_getsecurity:
511 * Retrieve a copy of the extended attribute representation of the
512 * security label associated with @name for @inode via @buffer. Note that
513 * @name is the remainder of the attribute name after the security prefix
514 * has been removed. @alloc is used to specify of the call should return a
515 * value via the buffer or just the value length Return size of buffer on
516 * success.
517 * @inode_setsecurity:
518 * Set the security label associated with @name for @inode from the
519 * extended attribute value @value. @size indicates the size of the
520 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
521 * Note that @name is the remainder of the attribute name after the
522 * security. prefix has been removed.
523 * Return 0 on success.
524 * @inode_listsecurity:
525 * Copy the extended attribute names for the security labels
526 * associated with @inode into @buffer. The maximum size of @buffer
527 * is specified by @buffer_size. @buffer may be NULL to request
528 * the size of the buffer required.
529 * Returns number of bytes used/required on success.
530 * @inode_need_killpriv:
531 * Called when an inode has been changed.
532 * @dentry is the dentry being changed.
533 * Return <0 on error to abort the inode change operation.
534 * Return 0 if inode_killpriv does not need to be called.
535 * Return >0 if inode_killpriv does need to be called.
536 * @inode_killpriv:
537 * The setuid bit is being removed. Remove similar security labels.
538 * Called with the dentry->d_inode->i_mutex held.
539 * @dentry is the dentry being changed.
540 * Return 0 on success. If error is returned, then the operation
541 * causing setuid bit removal is failed.
542 * @inode_getsecid:
543 * Get the secid associated with the node.
544 * @inode contains a pointer to the inode.
545 * @secid contains a pointer to the location where result will be saved.
546 * In case of failure, @secid will be set to zero.
547 *
548 * Security hooks for file operations
549 *
550 * @file_permission:
551 * Check file permissions before accessing an open file. This hook is
552 * called by various operations that read or write files. A security
553 * module can use this hook to perform additional checking on these
554 * operations, e.g. to revalidate permissions on use to support privilege
555 * bracketing or policy changes. Notice that this hook is used when the
556 * actual read/write operations are performed, whereas the
557 * inode_security_ops hook is called when a file is opened (as well as
558 * many other operations).
559 * Caveat: Although this hook can be used to revalidate permissions for
560 * various system call operations that read or write files, it does not
561 * address the revalidation of permissions for memory-mapped files.
562 * Security modules must handle this separately if they need such
563 * revalidation.
564 * @file contains the file structure being accessed.
565 * @mask contains the requested permissions.
566 * Return 0 if permission is granted.
567 * @file_alloc_security:
568 * Allocate and attach a security structure to the file->f_security field.
569 * The security field is initialized to NULL when the structure is first
570 * created.
571 * @file contains the file structure to secure.
572 * Return 0 if the hook is successful and permission is granted.
573 * @file_free_security:
574 * Deallocate and free any security structures stored in file->f_security.
575 * @file contains the file structure being modified.
576 * @file_ioctl:
577 * @file contains the file structure.
578 * @cmd contains the operation to perform.
579 * @arg contains the operational arguments.
580 * Check permission for an ioctl operation on @file. Note that @arg
581 * sometimes represents a user space pointer; in other cases, it may be a
582 * simple integer value. When @arg represents a user space pointer, it
583 * should never be used by the security module.
584 * Return 0 if permission is granted.
585 * @file_mmap :
586 * Check permissions for a mmap operation. The @file may be NULL, e.g.
587 * if mapping anonymous memory.
588 * @file contains the file structure for file to map (may be NULL).
589 * @reqprot contains the protection requested by the application.
590 * @prot contains the protection that will be applied by the kernel.
591 * @flags contains the operational flags.
592 * @addr contains virtual address that will be used for the operation.
593 * @addr_only contains a boolean: 0 if file-backed VMA, otherwise 1.
594 * Return 0 if permission is granted.
595 * @file_mprotect:
596 * Check permissions before changing memory access permissions.
597 * @vma contains the memory region to modify.
598 * @reqprot contains the protection requested by the application.
599 * @prot contains the protection that will be applied by the kernel.
600 * Return 0 if permission is granted.
601 * @file_lock:
602 * Check permission before performing file locking operations.
603 * Note: this hook mediates both flock and fcntl style locks.
604 * @file contains the file structure.
605 * @cmd contains the posix-translated lock operation to perform
606 * (e.g. F_RDLCK, F_WRLCK).
607 * Return 0 if permission is granted.
608 * @file_fcntl:
609 * Check permission before allowing the file operation specified by @cmd
610 * from being performed on the file @file. Note that @arg sometimes
611 * represents a user space pointer; in other cases, it may be a simple
612 * integer value. When @arg represents a user space pointer, it should
613 * never be used by the security module.
614 * @file contains the file structure.
615 * @cmd contains the operation to be performed.
616 * @arg contains the operational arguments.
617 * Return 0 if permission is granted.
618 * @file_set_fowner:
619 * Save owner security information (typically from current->security) in
620 * file->f_security for later use by the send_sigiotask hook.
621 * @file contains the file structure to update.
622 * Return 0 on success.
623 * @file_send_sigiotask:
624 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
625 * process @tsk. Note that this hook is sometimes called from interrupt.
626 * Note that the fown_struct, @fown, is never outside the context of a
627 * struct file, so the file structure (and associated security information)
628 * can always be obtained:
629 * container_of(fown, struct file, f_owner)
630 * @tsk contains the structure of task receiving signal.
631 * @fown contains the file owner information.
632 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
633 * Return 0 if permission is granted.
634 * @file_receive:
635 * This hook allows security modules to control the ability of a process
636 * to receive an open file descriptor via socket IPC.
637 * @file contains the file structure being received.
638 * Return 0 if permission is granted.
639 *
640 * Security hook for dentry
641 *
642 * @dentry_open
643 * Save open-time permission checking state for later use upon
644 * file_permission, and recheck access if anything has changed
645 * since inode_permission.
646 *
647 * Security hooks for task operations.
648 *
649 * @task_create:
650 * Check permission before creating a child process. See the clone(2)
651 * manual page for definitions of the @clone_flags.
652 * @clone_flags contains the flags indicating what should be shared.
653 * Return 0 if permission is granted.
654 * @cred_alloc_blank:
655 * @cred points to the credentials.
656 * @gfp indicates the atomicity of any memory allocations.
657 * Only allocate sufficient memory and attach to @cred such that
658 * cred_transfer() will not get ENOMEM.
659 * @cred_free:
660 * @cred points to the credentials.
661 * Deallocate and clear the cred->security field in a set of credentials.
662 * @cred_prepare:
663 * @new points to the new credentials.
664 * @old points to the original credentials.
665 * @gfp indicates the atomicity of any memory allocations.
666 * Prepare a new set of credentials by copying the data from the old set.
667 * @cred_transfer:
668 * @new points to the new credentials.
669 * @old points to the original credentials.
670 * Transfer data from original creds to new creds
671 * @kernel_act_as:
672 * Set the credentials for a kernel service to act as (subjective context).
673 * @new points to the credentials to be modified.
674 * @secid specifies the security ID to be set
675 * The current task must be the one that nominated @secid.
676 * Return 0 if successful.
677 * @kernel_create_files_as:
678 * Set the file creation context in a set of credentials to be the same as
679 * the objective context of the specified inode.
680 * @new points to the credentials to be modified.
681 * @inode points to the inode to use as a reference.
682 * The current task must be the one that nominated @inode.
683 * Return 0 if successful.
684 * @kernel_module_request:
685 * Ability to trigger the kernel to automatically upcall to userspace for
686 * userspace to load a kernel module with the given name.
687 * @kmod_name name of the module requested by the kernel
688 * Return 0 if successful.
689 * @task_fix_setuid:
690 * Update the module's state after setting one or more of the user
691 * identity attributes of the current process. The @flags parameter
692 * indicates which of the set*uid system calls invoked this hook. If
693 * @new is the set of credentials that will be installed. Modifications
694 * should be made to this rather than to @current->cred.
695 * @old is the set of credentials that are being replaces
696 * @flags contains one of the LSM_SETID_* values.
697 * Return 0 on success.
698 * @task_setpgid:
699 * Check permission before setting the process group identifier of the
700 * process @p to @pgid.
701 * @p contains the task_struct for process being modified.
702 * @pgid contains the new pgid.
703 * Return 0 if permission is granted.
704 * @task_getpgid:
705 * Check permission before getting the process group identifier of the
706 * process @p.
707 * @p contains the task_struct for the process.
708 * Return 0 if permission is granted.
709 * @task_getsid:
710 * Check permission before getting the session identifier of the process
711 * @p.
712 * @p contains the task_struct for the process.
713 * Return 0 if permission is granted.
714 * @task_getsecid:
715 * Retrieve the security identifier of the process @p.
716 * @p contains the task_struct for the process and place is into @secid.
717 * In case of failure, @secid will be set to zero.
718 *
719 * @task_setnice:
720 * Check permission before setting the nice value of @p to @nice.
721 * @p contains the task_struct of process.
722 * @nice contains the new nice value.
723 * Return 0 if permission is granted.
724 * @task_setioprio
725 * Check permission before setting the ioprio value of @p to @ioprio.
726 * @p contains the task_struct of process.
727 * @ioprio contains the new ioprio value
728 * Return 0 if permission is granted.
729 * @task_getioprio
730 * Check permission before getting the ioprio value of @p.
731 * @p contains the task_struct of process.
732 * Return 0 if permission is granted.
733 * @task_setrlimit:
734 * Check permission before setting the resource limits of the current
735 * process for @resource to @new_rlim. The old resource limit values can
736 * be examined by dereferencing (current->signal->rlim + resource).
737 * @resource contains the resource whose limit is being set.
738 * @new_rlim contains the new limits for @resource.
739 * Return 0 if permission is granted.
740 * @task_setscheduler:
741 * Check permission before setting scheduling policy and/or parameters of
742 * process @p based on @policy and @lp.
743 * @p contains the task_struct for process.
744 * @policy contains the scheduling policy.
745 * @lp contains the scheduling parameters.
746 * Return 0 if permission is granted.
747 * @task_getscheduler:
748 * Check permission before obtaining scheduling information for process
749 * @p.
750 * @p contains the task_struct for process.
751 * Return 0 if permission is granted.
752 * @task_movememory
753 * Check permission before moving memory owned by process @p.
754 * @p contains the task_struct for process.
755 * Return 0 if permission is granted.
756 * @task_kill:
757 * Check permission before sending signal @sig to @p. @info can be NULL,
758 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
759 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
760 * from the kernel and should typically be permitted.
761 * SIGIO signals are handled separately by the send_sigiotask hook in
762 * file_security_ops.
763 * @p contains the task_struct for process.
764 * @info contains the signal information.
765 * @sig contains the signal value.
766 * @secid contains the sid of the process where the signal originated
767 * Return 0 if permission is granted.
768 * @task_wait:
769 * Check permission before allowing a process to reap a child process @p
770 * and collect its status information.
771 * @p contains the task_struct for process.
772 * Return 0 if permission is granted.
773 * @task_prctl:
774 * Check permission before performing a process control operation on the
775 * current process.
776 * @option contains the operation.
777 * @arg2 contains a argument.
778 * @arg3 contains a argument.
779 * @arg4 contains a argument.
780 * @arg5 contains a argument.
781 * Return -ENOSYS if no-one wanted to handle this op, any other value to
782 * cause prctl() to return immediately with that value.
783 * @task_to_inode:
784 * Set the security attributes for an inode based on an associated task's
785 * security attributes, e.g. for /proc/pid inodes.
786 * @p contains the task_struct for the task.
787 * @inode contains the inode structure for the inode.
788 *
789 * Security hooks for Netlink messaging.
790 *
791 * @netlink_send:
792 * Save security information for a netlink message so that permission
793 * checking can be performed when the message is processed. The security
794 * information can be saved using the eff_cap field of the
795 * netlink_skb_parms structure. Also may be used to provide fine
796 * grained control over message transmission.
797 * @sk associated sock of task sending the message.
798 * @skb contains the sk_buff structure for the netlink message.
799 * Return 0 if the information was successfully saved and message
800 * is allowed to be transmitted.
801 *
802 * Security hooks for Unix domain networking.
803 *
804 * @unix_stream_connect:
805 * Check permissions before establishing a Unix domain stream connection
806 * between @sock and @other.
807 * @sock contains the sock structure.
808 * @other contains the peer sock structure.
809 * @newsk contains the new sock structure.
810 * Return 0 if permission is granted.
811 * @unix_may_send:
812 * Check permissions before connecting or sending datagrams from @sock to
813 * @other.
814 * @sock contains the socket structure.
815 * @sock contains the peer socket structure.
816 * Return 0 if permission is granted.
817 *
818 * The @unix_stream_connect and @unix_may_send hooks were necessary because
819 * Linux provides an alternative to the conventional file name space for Unix
820 * domain sockets. Whereas binding and connecting to sockets in the file name
821 * space is mediated by the typical file permissions (and caught by the mknod
822 * and permission hooks in inode_security_ops), binding and connecting to
823 * sockets in the abstract name space is completely unmediated. Sufficient
824 * control of Unix domain sockets in the abstract name space isn't possible
825 * using only the socket layer hooks, since we need to know the actual target
826 * socket, which is not looked up until we are inside the af_unix code.
827 *
828 * Security hooks for socket operations.
829 *
830 * @socket_create:
831 * Check permissions prior to creating a new socket.
832 * @family contains the requested protocol family.
833 * @type contains the requested communications type.
834 * @protocol contains the requested protocol.
835 * @kern set to 1 if a kernel socket.
836 * Return 0 if permission is granted.
837 * @socket_post_create:
838 * This hook allows a module to update or allocate a per-socket security
839 * structure. Note that the security field was not added directly to the
840 * socket structure, but rather, the socket security information is stored
841 * in the associated inode. Typically, the inode alloc_security hook will
842 * allocate and and attach security information to
843 * sock->inode->i_security. This hook may be used to update the
844 * sock->inode->i_security field with additional information that wasn't
845 * available when the inode was allocated.
846 * @sock contains the newly created socket structure.
847 * @family contains the requested protocol family.
848 * @type contains the requested communications type.
849 * @protocol contains the requested protocol.
850 * @kern set to 1 if a kernel socket.
851 * @socket_bind:
852 * Check permission before socket protocol layer bind operation is
853 * performed and the socket @sock is bound to the address specified in the
854 * @address parameter.
855 * @sock contains the socket structure.
856 * @address contains the address to bind to.
857 * @addrlen contains the length of address.
858 * Return 0 if permission is granted.
859 * @socket_connect:
860 * Check permission before socket protocol layer connect operation
861 * attempts to connect socket @sock to a remote address, @address.
862 * @sock contains the socket structure.
863 * @address contains the address of remote endpoint.
864 * @addrlen contains the length of address.
865 * Return 0 if permission is granted.
866 * @socket_listen:
867 * Check permission before socket protocol layer listen operation.
868 * @sock contains the socket structure.
869 * @backlog contains the maximum length for the pending connection queue.
870 * Return 0 if permission is granted.
871 * @socket_accept:
872 * Check permission before accepting a new connection. Note that the new
873 * socket, @newsock, has been created and some information copied to it,
874 * but the accept operation has not actually been performed.
875 * @sock contains the listening socket structure.
876 * @newsock contains the newly created server socket for connection.
877 * Return 0 if permission is granted.
878 * @socket_sendmsg:
879 * Check permission before transmitting a message to another socket.
880 * @sock contains the socket structure.
881 * @msg contains the message to be transmitted.
882 * @size contains the size of message.
883 * Return 0 if permission is granted.
884 * @socket_recvmsg:
885 * Check permission before receiving a message from a socket.
886 * @sock contains the socket structure.
887 * @msg contains the message structure.
888 * @size contains the size of message structure.
889 * @flags contains the operational flags.
890 * Return 0 if permission is granted.
891 * @socket_getsockname:
892 * Check permission before the local address (name) of the socket object
893 * @sock is retrieved.
894 * @sock contains the socket structure.
895 * Return 0 if permission is granted.
896 * @socket_getpeername:
897 * Check permission before the remote address (name) of a socket object
898 * @sock is retrieved.
899 * @sock contains the socket structure.
900 * Return 0 if permission is granted.
901 * @socket_getsockopt:
902 * Check permissions before retrieving the options associated with socket
903 * @sock.
904 * @sock contains the socket structure.
905 * @level contains the protocol level to retrieve option from.
906 * @optname contains the name of option to retrieve.
907 * Return 0 if permission is granted.
908 * @socket_setsockopt:
909 * Check permissions before setting the options associated with socket
910 * @sock.
911 * @sock contains the socket structure.
912 * @level contains the protocol level to set options for.
913 * @optname contains the name of the option to set.
914 * Return 0 if permission is granted.
915 * @socket_shutdown:
916 * Checks permission before all or part of a connection on the socket
917 * @sock is shut down.
918 * @sock contains the socket structure.
919 * @how contains the flag indicating how future sends and receives are handled.
920 * Return 0 if permission is granted.
921 * @socket_sock_rcv_skb:
922 * Check permissions on incoming network packets. This hook is distinct
923 * from Netfilter's IP input hooks since it is the first time that the
924 * incoming sk_buff @skb has been associated with a particular socket, @sk.
925 * Must not sleep inside this hook because some callers hold spinlocks.
926 * @sk contains the sock (not socket) associated with the incoming sk_buff.
927 * @skb contains the incoming network data.
928 * @socket_getpeersec_stream:
929 * This hook allows the security module to provide peer socket security
930 * state for unix or connected tcp sockets to userspace via getsockopt
931 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
932 * socket is associated with an ipsec SA.
933 * @sock is the local socket.
934 * @optval userspace memory where the security state is to be copied.
935 * @optlen userspace int where the module should copy the actual length
936 * of the security state.
937 * @len as input is the maximum length to copy to userspace provided
938 * by the caller.
939 * Return 0 if all is well, otherwise, typical getsockopt return
940 * values.
941 * @socket_getpeersec_dgram:
942 * This hook allows the security module to provide peer socket security
943 * state for udp sockets on a per-packet basis to userspace via
944 * getsockopt SO_GETPEERSEC. The application must first have indicated
945 * the IP_PASSSEC option via getsockopt. It can then retrieve the
946 * security state returned by this hook for a packet via the SCM_SECURITY
947 * ancillary message type.
948 * @skb is the skbuff for the packet being queried
949 * @secdata is a pointer to a buffer in which to copy the security data
950 * @seclen is the maximum length for @secdata
951 * Return 0 on success, error on failure.
952 * @sk_alloc_security:
953 * Allocate and attach a security structure to the sk->sk_security field,
954 * which is used to copy security attributes between local stream sockets.
955 * @sk_free_security:
956 * Deallocate security structure.
957 * @sk_clone_security:
958 * Clone/copy security structure.
959 * @sk_getsecid:
960 * Retrieve the LSM-specific secid for the sock to enable caching of network
961 * authorizations.
962 * @sock_graft:
963 * Sets the socket's isec sid to the sock's sid.
964 * @inet_conn_request:
965 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
966 * @inet_csk_clone:
967 * Sets the new child socket's sid to the openreq sid.
968 * @inet_conn_established:
969 * Sets the connection's peersid to the secmark on skb.
970 * @secmark_relabel_packet:
971 * check if the process should be allowed to relabel packets to the given secid
972 * @security_secmark_refcount_inc
973 * tells the LSM to increment the number of secmark labeling rules loaded
974 * @security_secmark_refcount_dec
975 * tells the LSM to decrement the number of secmark labeling rules loaded
976 * @req_classify_flow:
977 * Sets the flow's sid to the openreq sid.
978 * @tun_dev_create:
979 * Check permissions prior to creating a new TUN device.
980 * @tun_dev_post_create:
981 * This hook allows a module to update or allocate a per-socket security
982 * structure.
983 * @sk contains the newly created sock structure.
984 * @tun_dev_attach:
985 * Check permissions prior to attaching to a persistent TUN device. This
986 * hook can also be used by the module to update any security state
987 * associated with the TUN device's sock structure.
988 * @sk contains the existing sock structure.
989 *
990 * Security hooks for XFRM operations.
991 *
992 * @xfrm_policy_alloc_security:
993 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
994 * Database used by the XFRM system.
995 * @sec_ctx contains the security context information being provided by
996 * the user-level policy update program (e.g., setkey).
997 * Allocate a security structure to the xp->security field; the security
998 * field is initialized to NULL when the xfrm_policy is allocated.
999 * Return 0 if operation was successful (memory to allocate, legal context)
1000 * @xfrm_policy_clone_security:
1001 * @old_ctx contains an existing xfrm_sec_ctx.
1002 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1003 * Allocate a security structure in new_ctxp that contains the
1004 * information from the old_ctx structure.
1005 * Return 0 if operation was successful (memory to allocate).
1006 * @xfrm_policy_free_security:
1007 * @ctx contains the xfrm_sec_ctx
1008 * Deallocate xp->security.
1009 * @xfrm_policy_delete_security:
1010 * @ctx contains the xfrm_sec_ctx.
1011 * Authorize deletion of xp->security.
1012 * @xfrm_state_alloc_security:
1013 * @x contains the xfrm_state being added to the Security Association
1014 * Database by the XFRM system.
1015 * @sec_ctx contains the security context information being provided by
1016 * the user-level SA generation program (e.g., setkey or racoon).
1017 * @secid contains the secid from which to take the mls portion of the context.
1018 * Allocate a security structure to the x->security field; the security
1019 * field is initialized to NULL when the xfrm_state is allocated. Set the
1020 * context to correspond to either sec_ctx or polsec, with the mls portion
1021 * taken from secid in the latter case.
1022 * Return 0 if operation was successful (memory to allocate, legal context).
1023 * @xfrm_state_free_security:
1024 * @x contains the xfrm_state.
1025 * Deallocate x->security.
1026 * @xfrm_state_delete_security:
1027 * @x contains the xfrm_state.
1028 * Authorize deletion of x->security.
1029 * @xfrm_policy_lookup:
1030 * @ctx contains the xfrm_sec_ctx for which the access control is being
1031 * checked.
1032 * @fl_secid contains the flow security label that is used to authorize
1033 * access to the policy xp.
1034 * @dir contains the direction of the flow (input or output).
1035 * Check permission when a flow selects a xfrm_policy for processing
1036 * XFRMs on a packet. The hook is called when selecting either a
1037 * per-socket policy or a generic xfrm policy.
1038 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1039 * on other errors.
1040 * @xfrm_state_pol_flow_match:
1041 * @x contains the state to match.
1042 * @xp contains the policy to check for a match.
1043 * @fl contains the flow to check for a match.
1044 * Return 1 if there is a match.
1045 * @xfrm_decode_session:
1046 * @skb points to skb to decode.
1047 * @secid points to the flow key secid to set.
1048 * @ckall says if all xfrms used should be checked for same secid.
1049 * Return 0 if ckall is zero or all xfrms used have the same secid.
1050 *
1051 * Security hooks affecting all Key Management operations
1052 *
1053 * @key_alloc:
1054 * Permit allocation of a key and assign security data. Note that key does
1055 * not have a serial number assigned at this point.
1056 * @key points to the key.
1057 * @flags is the allocation flags
1058 * Return 0 if permission is granted, -ve error otherwise.
1059 * @key_free:
1060 * Notification of destruction; free security data.
1061 * @key points to the key.
1062 * No return value.
1063 * @key_permission:
1064 * See whether a specific operational right is granted to a process on a
1065 * key.
1066 * @key_ref refers to the key (key pointer + possession attribute bit).
1067 * @cred points to the credentials to provide the context against which to
1068 * evaluate the security data on the key.
1069 * @perm describes the combination of permissions required of this key.
1070 * Return 0 if permission is granted, -ve error otherwise.
1071 * @key_getsecurity:
1072 * Get a textual representation of the security context attached to a key
1073 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1074 * allocates the storage for the NUL-terminated string and the caller
1075 * should free it.
1076 * @key points to the key to be queried.
1077 * @_buffer points to a pointer that should be set to point to the
1078 * resulting string (if no label or an error occurs).
1079 * Return the length of the string (including terminating NUL) or -ve if
1080 * an error.
1081 * May also return 0 (and a NULL buffer pointer) if there is no label.
1082 *
1083 * Security hooks affecting all System V IPC operations.
1084 *
1085 * @ipc_permission:
1086 * Check permissions for access to IPC
1087 * @ipcp contains the kernel IPC permission structure
1088 * @flag contains the desired (requested) permission set
1089 * Return 0 if permission is granted.
1090 * @ipc_getsecid:
1091 * Get the secid associated with the ipc object.
1092 * @ipcp contains the kernel IPC permission structure.
1093 * @secid contains a pointer to the location where result will be saved.
1094 * In case of failure, @secid will be set to zero.
1095 *
1096 * Security hooks for individual messages held in System V IPC message queues
1097 * @msg_msg_alloc_security:
1098 * Allocate and attach a security structure to the msg->security field.
1099 * The security field is initialized to NULL when the structure is first
1100 * created.
1101 * @msg contains the message structure to be modified.
1102 * Return 0 if operation was successful and permission is granted.
1103 * @msg_msg_free_security:
1104 * Deallocate the security structure for this message.
1105 * @msg contains the message structure to be modified.
1106 *
1107 * Security hooks for System V IPC Message Queues
1108 *
1109 * @msg_queue_alloc_security:
1110 * Allocate and attach a security structure to the
1111 * msq->q_perm.security field. The security field is initialized to
1112 * NULL when the structure is first created.
1113 * @msq contains the message queue structure to be modified.
1114 * Return 0 if operation was successful and permission is granted.
1115 * @msg_queue_free_security:
1116 * Deallocate security structure for this message queue.
1117 * @msq contains the message queue structure to be modified.
1118 * @msg_queue_associate:
1119 * Check permission when a message queue is requested through the
1120 * msgget system call. This hook is only called when returning the
1121 * message queue identifier for an existing message queue, not when a
1122 * new message queue is created.
1123 * @msq contains the message queue to act upon.
1124 * @msqflg contains the operation control flags.
1125 * Return 0 if permission is granted.
1126 * @msg_queue_msgctl:
1127 * Check permission when a message control operation specified by @cmd
1128 * is to be performed on the message queue @msq.
1129 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1130 * @msq contains the message queue to act upon. May be NULL.
1131 * @cmd contains the operation to be performed.
1132 * Return 0 if permission is granted.
1133 * @msg_queue_msgsnd:
1134 * Check permission before a message, @msg, is enqueued on the message
1135 * queue, @msq.
1136 * @msq contains the message queue to send message to.
1137 * @msg contains the message to be enqueued.
1138 * @msqflg contains operational flags.
1139 * Return 0 if permission is granted.
1140 * @msg_queue_msgrcv:
1141 * Check permission before a message, @msg, is removed from the message
1142 * queue, @msq. The @target task structure contains a pointer to the
1143 * process that will be receiving the message (not equal to the current
1144 * process when inline receives are being performed).
1145 * @msq contains the message queue to retrieve message from.
1146 * @msg contains the message destination.
1147 * @target contains the task structure for recipient process.
1148 * @type contains the type of message requested.
1149 * @mode contains the operational flags.
1150 * Return 0 if permission is granted.
1151 *
1152 * Security hooks for System V Shared Memory Segments
1153 *
1154 * @shm_alloc_security:
1155 * Allocate and attach a security structure to the shp->shm_perm.security
1156 * field. The security field is initialized to NULL when the structure is
1157 * first created.
1158 * @shp contains the shared memory structure to be modified.
1159 * Return 0 if operation was successful and permission is granted.
1160 * @shm_free_security:
1161 * Deallocate the security struct for this memory segment.
1162 * @shp contains the shared memory structure to be modified.
1163 * @shm_associate:
1164 * Check permission when a shared memory region is requested through the
1165 * shmget system call. This hook is only called when returning the shared
1166 * memory region identifier for an existing region, not when a new shared
1167 * memory region is created.
1168 * @shp contains the shared memory structure to be modified.
1169 * @shmflg contains the operation control flags.
1170 * Return 0 if permission is granted.
1171 * @shm_shmctl:
1172 * Check permission when a shared memory control operation specified by
1173 * @cmd is to be performed on the shared memory region @shp.
1174 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1175 * @shp contains shared memory structure to be modified.
1176 * @cmd contains the operation to be performed.
1177 * Return 0 if permission is granted.
1178 * @shm_shmat:
1179 * Check permissions prior to allowing the shmat system call to attach the
1180 * shared memory segment @shp to the data segment of the calling process.
1181 * The attaching address is specified by @shmaddr.
1182 * @shp contains the shared memory structure to be modified.
1183 * @shmaddr contains the address to attach memory region to.
1184 * @shmflg contains the operational flags.
1185 * Return 0 if permission is granted.
1186 *
1187 * Security hooks for System V Semaphores
1188 *
1189 * @sem_alloc_security:
1190 * Allocate and attach a security structure to the sma->sem_perm.security
1191 * field. The security field is initialized to NULL when the structure is
1192 * first created.
1193 * @sma contains the semaphore structure
1194 * Return 0 if operation was successful and permission is granted.
1195 * @sem_free_security:
1196 * deallocate security struct for this semaphore
1197 * @sma contains the semaphore structure.
1198 * @sem_associate:
1199 * Check permission when a semaphore is requested through the semget
1200 * system call. This hook is only called when returning the semaphore
1201 * identifier for an existing semaphore, not when a new one must be
1202 * created.
1203 * @sma contains the semaphore structure.
1204 * @semflg contains the operation control flags.
1205 * Return 0 if permission is granted.
1206 * @sem_semctl:
1207 * Check permission when a semaphore operation specified by @cmd is to be
1208 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1209 * IPC_INFO or SEM_INFO.
1210 * @sma contains the semaphore structure. May be NULL.
1211 * @cmd contains the operation to be performed.
1212 * Return 0 if permission is granted.
1213 * @sem_semop
1214 * Check permissions before performing operations on members of the
1215 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1216 * may be modified.
1217 * @sma contains the semaphore structure.
1218 * @sops contains the operations to perform.
1219 * @nsops contains the number of operations to perform.
1220 * @alter contains the flag indicating whether changes are to be made.
1221 * Return 0 if permission is granted.
1222 *
1223 * @ptrace_access_check:
1224 * Check permission before allowing the current process to trace the
1225 * @child process.
1226 * Security modules may also want to perform a process tracing check
1227 * during an execve in the set_security or apply_creds hooks of
1228 * tracing check during an execve in the bprm_set_creds hook of
1229 * binprm_security_ops if the process is being traced and its security
1230 * attributes would be changed by the execve.
1231 * @child contains the task_struct structure for the target process.
1232 * @mode contains the PTRACE_MODE flags indicating the form of access.
1233 * Return 0 if permission is granted.
1234 * @ptrace_traceme:
1235 * Check that the @parent process has sufficient permission to trace the
1236 * current process before allowing the current process to present itself
1237 * to the @parent process for tracing.
1238 * The parent process will still have to undergo the ptrace_access_check
1239 * checks before it is allowed to trace this one.
1240 * @parent contains the task_struct structure for debugger process.
1241 * Return 0 if permission is granted.
1242 * @capget:
1243 * Get the @effective, @inheritable, and @permitted capability sets for
1244 * the @target process. The hook may also perform permission checking to
1245 * determine if the current process is allowed to see the capability sets
1246 * of the @target process.
1247 * @target contains the task_struct structure for target process.
1248 * @effective contains the effective capability set.
1249 * @inheritable contains the inheritable capability set.
1250 * @permitted contains the permitted capability set.
1251 * Return 0 if the capability sets were successfully obtained.
1252 * @capset:
1253 * Set the @effective, @inheritable, and @permitted capability sets for
1254 * the current process.
1255 * @new contains the new credentials structure for target process.
1256 * @old contains the current credentials structure for target process.
1257 * @effective contains the effective capability set.
1258 * @inheritable contains the inheritable capability set.
1259 * @permitted contains the permitted capability set.
1260 * Return 0 and update @new if permission is granted.
1261 * @capable:
1262 * Check whether the @tsk process has the @cap capability in the indicated
1263 * credentials.
1264 * @cred contains the credentials to use.
1265 * @ns contains the user namespace we want the capability in
1266 * @cap contains the capability <include/linux/capability.h>.
1267 * @audit: Whether to write an audit message or not
1268 * Return 0 if the capability is granted for @tsk.
1269 * @syslog:
1270 * Check permission before accessing the kernel message ring or changing
1271 * logging to the console.
1272 * See the syslog(2) manual page for an explanation of the @type values.
1273 * @type contains the type of action.
1274 * @from_file indicates the context of action (if it came from /proc).
1275 * Return 0 if permission is granted.
1276 * @settime:
1277 * Check permission to change the system time.
1278 * struct timespec and timezone are defined in include/linux/time.h
1279 * @ts contains new time
1280 * @tz contains new timezone
1281 * Return 0 if permission is granted.
1282 * @vm_enough_memory:
1283 * Check permissions for allocating a new virtual mapping.
1284 * @mm contains the mm struct it is being added to.
1285 * @pages contains the number of pages.
1286 * Return 0 if permission is granted.
1287 *
1288 * @secid_to_secctx:
1289 * Convert secid to security context. If secdata is NULL the length of
1290 * the result will be returned in seclen, but no secdata will be returned.
1291 * This does mean that the length could change between calls to check the
1292 * length and the next call which actually allocates and returns the secdata.
1293 * @secid contains the security ID.
1294 * @secdata contains the pointer that stores the converted security context.
1295 * @seclen pointer which contains the length of the data
1296 * @secctx_to_secid:
1297 * Convert security context to secid.
1298 * @secid contains the pointer to the generated security ID.
1299 * @secdata contains the security context.
1300 *
1301 * @release_secctx:
1302 * Release the security context.
1303 * @secdata contains the security context.
1304 * @seclen contains the length of the security context.
1305 *
1306 * Security hooks for Audit
1307 *
1308 * @audit_rule_init:
1309 * Allocate and initialize an LSM audit rule structure.
1310 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1311 * @op contains the operator the rule uses.
1312 * @rulestr contains the context where the rule will be applied to.
1313 * @lsmrule contains a pointer to receive the result.
1314 * Return 0 if @lsmrule has been successfully set,
1315 * -EINVAL in case of an invalid rule.
1316 *
1317 * @audit_rule_known:
1318 * Specifies whether given @rule contains any fields related to current LSM.
1319 * @rule contains the audit rule of interest.
1320 * Return 1 in case of relation found, 0 otherwise.
1321 *
1322 * @audit_rule_match:
1323 * Determine if given @secid matches a rule previously approved
1324 * by @audit_rule_known.
1325 * @secid contains the security id in question.
1326 * @field contains the field which relates to current LSM.
1327 * @op contains the operator that will be used for matching.
1328 * @rule points to the audit rule that will be checked against.
1329 * @actx points to the audit context associated with the check.
1330 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1331 *
1332 * @audit_rule_free:
1333 * Deallocate the LSM audit rule structure previously allocated by
1334 * audit_rule_init.
1335 * @rule contains the allocated rule
1336 *
1337 * @inode_notifysecctx:
1338 * Notify the security module of what the security context of an inode
1339 * should be. Initializes the incore security context managed by the
1340 * security module for this inode. Example usage: NFS client invokes
1341 * this hook to initialize the security context in its incore inode to the
1342 * value provided by the server for the file when the server returned the
1343 * file's attributes to the client.
1344 *
1345 * Must be called with inode->i_mutex locked.
1346 *
1347 * @inode we wish to set the security context of.
1348 * @ctx contains the string which we wish to set in the inode.
1349 * @ctxlen contains the length of @ctx.
1350 *
1351 * @inode_setsecctx:
1352 * Change the security context of an inode. Updates the
1353 * incore security context managed by the security module and invokes the
1354 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1355 * xattrs that represent the context. Example usage: NFS server invokes
1356 * this hook to change the security context in its incore inode and on the
1357 * backing filesystem to a value provided by the client on a SETATTR
1358 * operation.
1359 *
1360 * Must be called with inode->i_mutex locked.
1361 *
1362 * @dentry contains the inode we wish to set the security context of.
1363 * @ctx contains the string which we wish to set in the inode.
1364 * @ctxlen contains the length of @ctx.
1365 *
1366 * @inode_getsecctx:
1367 * Returns a string containing all relevant security context information
1368 *
1369 * @inode we wish to get the security context of.
1370 * @ctx is a pointer in which to place the allocated security context.
1371 * @ctxlen points to the place to put the length of @ctx.
1372 * This is the main security structure.
1373 */
1419 #ifdef CONFIG_SECURITY_PATH
1435 #endif
1469 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1470 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1499 gfp_t gfp);
1571 #ifdef CONFIG_SECURITY_NETWORK
1594 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1614 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1617 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1622 u32 secid);
1632 /* key management security hooks */
1633 #ifdef CONFIG_KEYS
1638 key_perm_t perm);
1642 #ifdef CONFIG_AUDIT
1649 };
1651 /* prototypes */
1658 /* Security operations */
1734 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1735 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1818 };
1821 {
1822 }
1825 {
1826 }
1828 /*
1829 * This is the default capabilities functionality. Most of these functions
1830 * are just stubbed out, but a few must call the proper capable code.
1831 */
1834 {
1836 }
1840 {
1842 }
1845 {
1847 }
1853 {
1855 }
1862 {
1864 }
1868 {
1870 }
1875 }
1879 {
1881 }
1884 {
1886 }
1889 {
1891 }
1895 {
1897 }
1900 {
1903 }
1906 {
1909 }
1912 {
1913 /* If current->mm is a kernel thread then we will pass NULL,
1914 for this specific case that is fine */
1916 }
1919 {
1921 }
1924 {
1926 }
1929 {
1930 }
1933 {
1934 }
1937 {
1939 }
1942 {
1944 }
1947 { }
1950 {
1952 }
1955 {
1957 }
1960 {
1962 }
1966 {
1968 }
1971 {
1973 }
1978 {
1980 }
1983 {
1985 }
1989 {
1991 }
1995 {
1997 }
2001 { }
2004 {
2006 }
2009 {
2011 }
2014 { }
2021 {
2023 }
2030 {
2032 }
2036 umode_t mode)
2037 {
2039 }
2044 {
2046 }
2050 {
2052 }
2057 {
2059 }
2064 {
2066 }
2070 {
2072 }
2077 {
2079 }
2085 {
2087 }
2090 {
2092 }
2096 {
2098 }
2101 {
2103 }
2107 {
2109 }
2113 {
2115 }
2119 {
2121 }
2125 { }
2129 {
2131 }
2134 {
2136 }
2140 {
2142 }
2145 {
2147 }
2150 {
2152 }
2154 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2155 {
2157 }
2159 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2160 {
2162 }
2164 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2165 {
2167 }
2170 {
2172 }
2175 {
2177 }
2180 {
2182 }
2185 { }
2189 {
2191 }
2198 {
2200 }
2205 {
2207 }
2210 {
2212 }
2216 {
2218 }
2221 {
2223 }
2228 {
2230 }
2233 {
2235 }
2239 {
2241 }
2244 {
2246 }
2249 {
2251 }
2254 { }
2258 gfp_t gfp)
2259 {
2261 }
2265 {
2266 }
2269 {
2271 }
2275 {
2277 }
2280 {
2282 }
2287 {
2289 }
2292 {
2294 }
2297 {
2299 }
2302 {
2304 }
2307 {
2309 }
2312 {
2314 }
2317 {
2319 }
2322 {
2324 }
2329 {
2331 }
2334 {
2336 }
2339 {
2341 }
2344 {
2346 }
2350 u32 secid)
2351 {
2353 }
2356 {
2358 }
2364 {
2366 }
2369 { }
2373 {
2375 }
2378 {
2380 }
2383 {
2385 }
2388 { }
2391 {
2393 }
2396 { }
2400 {
2402 }
2405 {
2407 }
2411 {
2413 }
2419 {
2421 }
2424 {
2426 }
2429 { }
2433 {
2435 }
2438 {
2440 }
2444 {
2446 }
2449 {
2451 }
2454 { }
2457 {
2459 }
2462 {
2464 }
2469 {
2471 }
2474 { }
2477 {
2479 }
2481 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2482 {
2484 }
2487 {
2489 }
2492 {
2494 }
2497 u32 seclen,
2499 {
2501 }
2504 {
2505 }
2508 {
2510 }
2512 {
2514 }
2516 {
2518 }
2521 #ifdef CONFIG_SECURITY_NETWORK
2567 {
2569 }
2573 {
2575 }
2579 {
2581 }
2587 {
2589 }
2594 {
2596 }
2601 {
2603 }
2606 {
2608 }
2612 {
2614 }
2618 {
2620 }
2625 {
2627 }
2630 {
2632 }
2635 {
2637 }
2641 {
2643 }
2647 {
2649 }
2652 {
2654 }
2657 {
2659 }
2663 {
2665 }
2667 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2668 {
2670 }
2673 {
2675 }
2678 {
2679 }
2682 {
2683 }
2686 {
2687 }
2689 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2690 {
2691 }
2694 {
2695 }
2699 {
2701 }
2705 {
2706 }
2710 {
2711 }
2714 {
2716 }
2719 {
2720 }
2723 {
2724 }
2727 {
2729 }
2732 {
2733 }
2736 {
2738 }
2741 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2761 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2762 {
2764 }
2766 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2767 {
2769 }
2772 {
2773 }
2776 {
2778 }
2782 {
2784 }
2788 {
2790 }
2793 {
2794 }
2797 {
2799 }
2802 {
2804 }
2808 {
2810 }
2813 {
2815 }
2818 {
2819 }
2823 #ifdef CONFIG_SECURITY_PATH
2841 {
2843 }
2846 umode_t mode)
2847 {
2849 }
2852 {
2854 }
2858 {
2860 }
2863 {
2865 }
2869 {
2871 }
2876 {
2878 }
2884 {
2886 }
2889 {
2891 }
2894 {
2896 }
2899 {
2901 }
2904 #ifdef CONFIG_KEYS
2905 #ifdef CONFIG_SECURITY
2913 #else
2918 {
2920 }
2923 {
2924 }
2928 key_perm_t perm)
2929 {
2931 }
2934 {
2937 }
2939 #endif
2942 #ifdef CONFIG_AUDIT
2943 #ifdef CONFIG_SECURITY
2950 #else
2954 {
2956 }
2959 {
2961 }
2965 {
2967 }
2970 { }
2975 #ifdef CONFIG_SECURITYFS
2987 {
2989 }
2992 umode_t mode,
2996 {
2998 }
3001 {}
3003 #endif
3005 #ifdef CONFIG_SECURITY
3008 {
3010 }
3013 {
3015 }
3017 #else
3020 {
3022 }
3025 { }