| blob | ab0e091ce5facf0047c57191f9e631fd5c4bb791 |
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>
56 /* Maximum number of letters for an LSM name string */
57 #define SECURITY_NAME_MAX 10
59 /* If capable should audit the security request */
60 #define SECURITY_CAP_NOAUDIT 0
61 #define SECURITY_CAP_AUDIT 1
68 /*
69 * These functions are in security/capability.c and are used
70 * as the default capabilities functions
71 */
77 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
117 #ifdef CONFIG_MMU
120 #else
121 #define dac_mmap_min_addr 0UL
122 #endif
124 /*
125 * Values used in the task_security_ops calls
126 */
127 /* setuid or setgid, id0 == uid or gid */
128 #define LSM_SETID_ID 1
130 /* setreuid or setregid, id0 == real, id1 == eff */
131 #define LSM_SETID_RE 2
133 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
134 #define LSM_SETID_RES 4
136 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
137 #define LSM_SETID_FS 8
139 /* forward declares to avoid warnings */
143 /* bprm->unsafe reasons */
144 #define LSM_UNSAFE_SHARE 1
145 #define LSM_UNSAFE_PTRACE 2
146 #define LSM_UNSAFE_PTRACE_CAP 4
147 #define LSM_UNSAFE_NO_NEW_PRIVS 8
149 #ifdef CONFIG_MMU
152 #endif
154 /* security_inode_init_security callback function to write xattrs */
158 #ifdef CONFIG_SECURITY
164 };
167 {
171 }
174 {
184 }
186 /**
187 * struct security_operations - main security structure
188 *
189 * Security module identifier.
190 *
191 * @name:
192 * A string that acts as a unique identifier for the LSM with max number
193 * of characters = SECURITY_NAME_MAX.
194 *
195 * Security hooks for program execution operations.
196 *
197 * @bprm_set_creds:
198 * Save security information in the bprm->security field, typically based
199 * on information about the bprm->file, for later use by the apply_creds
200 * hook. This hook may also optionally check permissions (e.g. for
201 * transitions between security domains).
202 * This hook may be called multiple times during a single execve, e.g. for
203 * interpreters. The hook can tell whether it has already been called by
204 * checking to see if @bprm->security is non-NULL. If so, then the hook
205 * may decide either to retain the security information saved earlier or
206 * to replace it.
207 * @bprm contains the linux_binprm structure.
208 * Return 0 if the hook is successful and permission is granted.
209 * @bprm_check_security:
210 * This hook mediates the point when a search for a binary handler will
211 * begin. It allows a check the @bprm->security value which is set in the
212 * preceding set_creds call. The primary difference from set_creds is
213 * that the argv list and envp list are reliably available in @bprm. This
214 * hook may be called multiple times during a single execve; and in each
215 * pass set_creds is called first.
216 * @bprm contains the linux_binprm structure.
217 * Return 0 if the hook is successful and permission is granted.
218 * @bprm_committing_creds:
219 * Prepare to install the new security attributes of a process being
220 * transformed by an execve operation, based on the old credentials
221 * pointed to by @current->cred and the information set in @bprm->cred by
222 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
223 * This hook is a good place to perform state changes on the process such
224 * as closing open file descriptors to which access will no longer be
225 * granted when the attributes are changed. This is called immediately
226 * before commit_creds().
227 * @bprm_committed_creds:
228 * Tidy up after the installation of the new security attributes of a
229 * process being transformed by an execve operation. The new credentials
230 * have, by this point, been set to @current->cred. @bprm points to the
231 * linux_binprm structure. This hook is a good place to perform state
232 * changes on the process such as clearing out non-inheritable signal
233 * state. This is called immediately after commit_creds().
234 * @bprm_secureexec:
235 * Return a boolean value (0 or 1) indicating whether a "secure exec"
236 * is required. The flag is passed in the auxiliary table
237 * on the initial stack to the ELF interpreter to indicate whether libc
238 * should enable secure mode.
239 * @bprm contains the linux_binprm structure.
240 *
241 * Security hooks for filesystem operations.
242 *
243 * @sb_alloc_security:
244 * Allocate and attach a security structure to the sb->s_security field.
245 * The s_security field is initialized to NULL when the structure is
246 * allocated.
247 * @sb contains the super_block structure to be modified.
248 * Return 0 if operation was successful.
249 * @sb_free_security:
250 * Deallocate and clear the sb->s_security field.
251 * @sb contains the super_block structure to be modified.
252 * @sb_statfs:
253 * Check permission before obtaining filesystem statistics for the @mnt
254 * mountpoint.
255 * @dentry is a handle on the superblock for the filesystem.
256 * Return 0 if permission is granted.
257 * @sb_mount:
258 * Check permission before an object specified by @dev_name is mounted on
259 * the mount point named by @nd. For an ordinary mount, @dev_name
260 * identifies a device if the file system type requires a device. For a
261 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
262 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
263 * pathname of the object being mounted.
264 * @dev_name contains the name for object being mounted.
265 * @path contains the path for mount point object.
266 * @type contains the filesystem type.
267 * @flags contains the mount flags.
268 * @data contains the filesystem-specific data.
269 * Return 0 if permission is granted.
270 * @sb_copy_data:
271 * Allow mount option data to be copied prior to parsing by the filesystem,
272 * so that the security module can extract security-specific mount
273 * options cleanly (a filesystem may modify the data e.g. with strsep()).
274 * This also allows the original mount data to be stripped of security-
275 * specific options to avoid having to make filesystems aware of them.
276 * @type the type of filesystem being mounted.
277 * @orig the original mount data copied from userspace.
278 * @copy copied data which will be passed to the security module.
279 * Returns 0 if the copy was successful.
280 * @sb_remount:
281 * Extracts security system specific mount options and verifies no changes
282 * are being made to those options.
283 * @sb superblock being remounted
284 * @data contains the filesystem-specific data.
285 * Return 0 if permission is granted.
286 * @sb_umount:
287 * Check permission before the @mnt file system is unmounted.
288 * @mnt contains the mounted file system.
289 * @flags contains the unmount flags, e.g. MNT_FORCE.
290 * Return 0 if permission is granted.
291 * @sb_pivotroot:
292 * Check permission before pivoting the root filesystem.
293 * @old_path contains the path for the new location of the current root (put_old).
294 * @new_path contains the path for the new root (new_root).
295 * Return 0 if permission is granted.
296 * @sb_set_mnt_opts:
297 * Set the security relevant mount options used for a superblock
298 * @sb the superblock to set security mount options for
299 * @opts binary data structure containing all lsm mount data
300 * @sb_clone_mnt_opts:
301 * Copy all security options from a given superblock to another
302 * @oldsb old superblock which contain information to clone
303 * @newsb new superblock which needs filled in
304 * @sb_parse_opts_str:
305 * Parse a string of security data filling in the opts structure
306 * @options string containing all mount options known by the LSM
307 * @opts binary data structure usable by the LSM
308 *
309 * Security hooks for inode operations.
310 *
311 * @inode_alloc_security:
312 * Allocate and attach a security structure to @inode->i_security. The
313 * i_security field is initialized to NULL when the inode structure is
314 * allocated.
315 * @inode contains the inode structure.
316 * Return 0 if operation was successful.
317 * @inode_free_security:
318 * @inode contains the inode structure.
319 * Deallocate the inode security structure and set @inode->i_security to
320 * NULL.
321 * @inode_init_security:
322 * Obtain the security attribute name suffix and value to set on a newly
323 * created inode and set up the incore security field for the new inode.
324 * This hook is called by the fs code as part of the inode creation
325 * transaction and provides for atomic labeling of the inode, unlike
326 * the post_create/mkdir/... hooks called by the VFS. The hook function
327 * is expected to allocate the name and value via kmalloc, with the caller
328 * being responsible for calling kfree after using them.
329 * If the security module does not use security attributes or does
330 * not wish to put a security attribute on this particular inode,
331 * then it should return -EOPNOTSUPP to skip this processing.
332 * @inode contains the inode structure of the newly created inode.
333 * @dir contains the inode structure of the parent directory.
334 * @qstr contains the last path component of the new object
335 * @name will be set to the allocated name suffix (e.g. selinux).
336 * @value will be set to the allocated attribute value.
337 * @len will be set to the length of the value.
338 * Returns 0 if @name and @value have been successfully set,
339 * -EOPNOTSUPP if no security attribute is needed, or
340 * -ENOMEM on memory allocation failure.
341 * @inode_create:
342 * Check permission to create a regular file.
343 * @dir contains inode structure of the parent of the new file.
344 * @dentry contains the dentry structure for the file to be created.
345 * @mode contains the file mode of the file to be created.
346 * Return 0 if permission is granted.
347 * @inode_link:
348 * Check permission before creating a new hard link to a file.
349 * @old_dentry contains the dentry structure for an existing link to the file.
350 * @dir contains the inode structure of the parent directory of the new link.
351 * @new_dentry contains the dentry structure for the new link.
352 * Return 0 if permission is granted.
353 * @path_link:
354 * Check permission before creating a new hard link to a file.
355 * @old_dentry contains the dentry structure for an existing link
356 * to the file.
357 * @new_dir contains the path structure of the parent directory of
358 * the new link.
359 * @new_dentry contains the dentry structure for the new link.
360 * Return 0 if permission is granted.
361 * @inode_unlink:
362 * Check the permission to remove a hard link to a file.
363 * @dir contains the inode structure of parent directory of the file.
364 * @dentry contains the dentry structure for file to be unlinked.
365 * Return 0 if permission is granted.
366 * @path_unlink:
367 * Check the permission to remove a hard link to a file.
368 * @dir contains the path structure of parent directory of the file.
369 * @dentry contains the dentry structure for file to be unlinked.
370 * Return 0 if permission is granted.
371 * @inode_symlink:
372 * Check the permission to create a symbolic link to a file.
373 * @dir contains the inode structure of parent directory of the symbolic link.
374 * @dentry contains the dentry structure of the symbolic link.
375 * @old_name contains the pathname of file.
376 * Return 0 if permission is granted.
377 * @path_symlink:
378 * Check the permission to create a symbolic link to a file.
379 * @dir contains the path structure of parent directory of
380 * the symbolic link.
381 * @dentry contains the dentry structure of the symbolic link.
382 * @old_name contains the pathname of file.
383 * Return 0 if permission is granted.
384 * @inode_mkdir:
385 * Check permissions to create a new directory in the existing directory
386 * associated with inode structure @dir.
387 * @dir contains the inode structure of parent of the directory to be created.
388 * @dentry contains the dentry structure of new directory.
389 * @mode contains the mode of new directory.
390 * Return 0 if permission is granted.
391 * @path_mkdir:
392 * Check permissions to create a new directory in the existing directory
393 * associated with path structure @path.
394 * @dir contains the path structure of parent of the directory
395 * to be created.
396 * @dentry contains the dentry structure of new directory.
397 * @mode contains the mode of new directory.
398 * Return 0 if permission is granted.
399 * @inode_rmdir:
400 * Check the permission to remove a directory.
401 * @dir contains the inode structure of parent of the directory to be removed.
402 * @dentry contains the dentry structure of directory to be removed.
403 * Return 0 if permission is granted.
404 * @path_rmdir:
405 * Check the permission to remove a directory.
406 * @dir contains the path structure of parent of the directory to be
407 * removed.
408 * @dentry contains the dentry structure of directory to be removed.
409 * Return 0 if permission is granted.
410 * @inode_mknod:
411 * Check permissions when creating a special file (or a socket or a fifo
412 * file created via the mknod system call). Note that if mknod operation
413 * is being done for a regular file, then the create hook will be called
414 * and not this hook.
415 * @dir contains the inode structure of parent of the new file.
416 * @dentry contains the dentry structure of the new file.
417 * @mode contains the mode of the new file.
418 * @dev contains the device number.
419 * Return 0 if permission is granted.
420 * @path_mknod:
421 * Check permissions when creating a file. Note that this hook is called
422 * even if mknod operation is being done for a regular file.
423 * @dir contains the path structure of parent of the new file.
424 * @dentry contains the dentry structure of the new file.
425 * @mode contains the mode of the new file.
426 * @dev contains the undecoded device number. Use new_decode_dev() to get
427 * the decoded device number.
428 * Return 0 if permission is granted.
429 * @inode_rename:
430 * Check for permission to rename a file or directory.
431 * @old_dir contains the inode structure for parent of the old link.
432 * @old_dentry contains the dentry structure of the old link.
433 * @new_dir contains the inode structure for parent of the new link.
434 * @new_dentry contains the dentry structure of the new link.
435 * Return 0 if permission is granted.
436 * @path_rename:
437 * Check for permission to rename a file or directory.
438 * @old_dir contains the path structure for parent of the old link.
439 * @old_dentry contains the dentry structure of the old link.
440 * @new_dir contains the path structure for parent of the new link.
441 * @new_dentry contains the dentry structure of the new link.
442 * Return 0 if permission is granted.
443 * @path_chmod:
444 * Check for permission to change DAC's permission of a file or directory.
445 * @dentry contains the dentry structure.
446 * @mnt contains the vfsmnt structure.
447 * @mode contains DAC's mode.
448 * Return 0 if permission is granted.
449 * @path_chown:
450 * Check for permission to change owner/group of a file or directory.
451 * @path contains the path structure.
452 * @uid contains new owner's ID.
453 * @gid contains new group's ID.
454 * Return 0 if permission is granted.
455 * @path_chroot:
456 * Check for permission to change root directory.
457 * @path contains the path structure.
458 * Return 0 if permission is granted.
459 * @inode_readlink:
460 * Check the permission to read the symbolic link.
461 * @dentry contains the dentry structure for the file link.
462 * Return 0 if permission is granted.
463 * @inode_follow_link:
464 * Check permission to follow a symbolic link when looking up a pathname.
465 * @dentry contains the dentry structure for the link.
466 * @nd contains the nameidata structure for the parent directory.
467 * Return 0 if permission is granted.
468 * @inode_permission:
469 * Check permission before accessing an inode. This hook is called by the
470 * existing Linux permission function, so a security module can use it to
471 * provide additional checking for existing Linux permission checks.
472 * Notice that this hook is called when a file is opened (as well as many
473 * other operations), whereas the file_security_ops permission hook is
474 * called when the actual read/write operations are performed.
475 * @inode contains the inode structure to check.
476 * @mask contains the permission mask.
477 * Return 0 if permission is granted.
478 * @inode_setattr:
479 * Check permission before setting file attributes. Note that the kernel
480 * call to notify_change is performed from several locations, whenever
481 * file attributes change (such as when a file is truncated, chown/chmod
482 * operations, transferring disk quotas, etc).
483 * @dentry contains the dentry structure for the file.
484 * @attr is the iattr structure containing the new file attributes.
485 * Return 0 if permission is granted.
486 * @path_truncate:
487 * Check permission before truncating a file.
488 * @path contains the path structure for the file.
489 * Return 0 if permission is granted.
490 * @inode_getattr:
491 * Check permission before obtaining file attributes.
492 * @mnt is the vfsmount where the dentry was looked up
493 * @dentry contains the dentry structure for the file.
494 * Return 0 if permission is granted.
495 * @inode_setxattr:
496 * Check permission before setting the extended attributes
497 * @value identified by @name for @dentry.
498 * Return 0 if permission is granted.
499 * @inode_post_setxattr:
500 * Update inode security field after successful setxattr operation.
501 * @value identified by @name for @dentry.
502 * @inode_getxattr:
503 * Check permission before obtaining the extended attributes
504 * identified by @name for @dentry.
505 * Return 0 if permission is granted.
506 * @inode_listxattr:
507 * Check permission before obtaining the list of extended attribute
508 * names for @dentry.
509 * Return 0 if permission is granted.
510 * @inode_removexattr:
511 * Check permission before removing the extended attribute
512 * identified by @name for @dentry.
513 * Return 0 if permission is granted.
514 * @inode_getsecurity:
515 * Retrieve a copy of the extended attribute representation of the
516 * security label associated with @name for @inode via @buffer. Note that
517 * @name is the remainder of the attribute name after the security prefix
518 * has been removed. @alloc is used to specify of the call should return a
519 * value via the buffer or just the value length Return size of buffer on
520 * success.
521 * @inode_setsecurity:
522 * Set the security label associated with @name for @inode from the
523 * extended attribute value @value. @size indicates the size of the
524 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
525 * Note that @name is the remainder of the attribute name after the
526 * security. prefix has been removed.
527 * Return 0 on success.
528 * @inode_listsecurity:
529 * Copy the extended attribute names for the security labels
530 * associated with @inode into @buffer. The maximum size of @buffer
531 * is specified by @buffer_size. @buffer may be NULL to request
532 * the size of the buffer required.
533 * Returns number of bytes used/required on success.
534 * @inode_need_killpriv:
535 * Called when an inode has been changed.
536 * @dentry is the dentry being changed.
537 * Return <0 on error to abort the inode change operation.
538 * Return 0 if inode_killpriv does not need to be called.
539 * Return >0 if inode_killpriv does need to be called.
540 * @inode_killpriv:
541 * The setuid bit is being removed. Remove similar security labels.
542 * Called with the dentry->d_inode->i_mutex held.
543 * @dentry is the dentry being changed.
544 * Return 0 on success. If error is returned, then the operation
545 * causing setuid bit removal is failed.
546 * @inode_getsecid:
547 * Get the secid associated with the node.
548 * @inode contains a pointer to the inode.
549 * @secid contains a pointer to the location where result will be saved.
550 * In case of failure, @secid will be set to zero.
551 *
552 * Security hooks for file operations
553 *
554 * @file_permission:
555 * Check file permissions before accessing an open file. This hook is
556 * called by various operations that read or write files. A security
557 * module can use this hook to perform additional checking on these
558 * operations, e.g. to revalidate permissions on use to support privilege
559 * bracketing or policy changes. Notice that this hook is used when the
560 * actual read/write operations are performed, whereas the
561 * inode_security_ops hook is called when a file is opened (as well as
562 * many other operations).
563 * Caveat: Although this hook can be used to revalidate permissions for
564 * various system call operations that read or write files, it does not
565 * address the revalidation of permissions for memory-mapped files.
566 * Security modules must handle this separately if they need such
567 * revalidation.
568 * @file contains the file structure being accessed.
569 * @mask contains the requested permissions.
570 * Return 0 if permission is granted.
571 * @file_alloc_security:
572 * Allocate and attach a security structure to the file->f_security field.
573 * The security field is initialized to NULL when the structure is first
574 * created.
575 * @file contains the file structure to secure.
576 * Return 0 if the hook is successful and permission is granted.
577 * @file_free_security:
578 * Deallocate and free any security structures stored in file->f_security.
579 * @file contains the file structure being modified.
580 * @file_ioctl:
581 * @file contains the file structure.
582 * @cmd contains the operation to perform.
583 * @arg contains the operational arguments.
584 * Check permission for an ioctl operation on @file. Note that @arg
585 * sometimes represents a user space pointer; in other cases, it may be a
586 * simple integer value. When @arg represents a user space pointer, it
587 * should never be used by the security module.
588 * Return 0 if permission is granted.
589 * @file_mmap :
590 * Check permissions for a mmap operation. The @file may be NULL, e.g.
591 * if mapping anonymous memory.
592 * @file contains the file structure for file to map (may be NULL).
593 * @reqprot contains the protection requested by the application.
594 * @prot contains the protection that will be applied by the kernel.
595 * @flags contains the operational flags.
596 * @addr contains virtual address that will be used for the operation.
597 * @addr_only contains a boolean: 0 if file-backed VMA, otherwise 1.
598 * Return 0 if permission is granted.
599 * @file_mprotect:
600 * Check permissions before changing memory access permissions.
601 * @vma contains the memory region to modify.
602 * @reqprot contains the protection requested by the application.
603 * @prot contains the protection that will be applied by the kernel.
604 * Return 0 if permission is granted.
605 * @file_lock:
606 * Check permission before performing file locking operations.
607 * Note: this hook mediates both flock and fcntl style locks.
608 * @file contains the file structure.
609 * @cmd contains the posix-translated lock operation to perform
610 * (e.g. F_RDLCK, F_WRLCK).
611 * Return 0 if permission is granted.
612 * @file_fcntl:
613 * Check permission before allowing the file operation specified by @cmd
614 * from being performed on the file @file. Note that @arg sometimes
615 * represents a user space pointer; in other cases, it may be a simple
616 * integer value. When @arg represents a user space pointer, it should
617 * never be used by the security module.
618 * @file contains the file structure.
619 * @cmd contains the operation to be performed.
620 * @arg contains the operational arguments.
621 * Return 0 if permission is granted.
622 * @file_set_fowner:
623 * Save owner security information (typically from current->security) in
624 * file->f_security for later use by the send_sigiotask hook.
625 * @file contains the file structure to update.
626 * Return 0 on success.
627 * @file_send_sigiotask:
628 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
629 * process @tsk. Note that this hook is sometimes called from interrupt.
630 * Note that the fown_struct, @fown, is never outside the context of a
631 * struct file, so the file structure (and associated security information)
632 * can always be obtained:
633 * container_of(fown, struct file, f_owner)
634 * @tsk contains the structure of task receiving signal.
635 * @fown contains the file owner information.
636 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
637 * Return 0 if permission is granted.
638 * @file_receive:
639 * This hook allows security modules to control the ability of a process
640 * to receive an open file descriptor via socket IPC.
641 * @file contains the file structure being received.
642 * Return 0 if permission is granted.
643 * @file_open
644 * Save open-time permission checking state for later use upon
645 * file_permission, and recheck access if anything has changed
646 * since inode_permission.
647 *
648 * Security hooks for task operations.
649 *
650 * @task_create:
651 * Check permission before creating a child process. See the clone(2)
652 * manual page for definitions of the @clone_flags.
653 * @clone_flags contains the flags indicating what should be shared.
654 * Return 0 if permission is granted.
655 * @task_free:
656 * @task task being freed
657 * Handle release of task-related resources. (Note that this can be called
658 * from interrupt context.)
659 * @cred_alloc_blank:
660 * @cred points to the credentials.
661 * @gfp indicates the atomicity of any memory allocations.
662 * Only allocate sufficient memory and attach to @cred such that
663 * cred_transfer() will not get ENOMEM.
664 * @cred_free:
665 * @cred points to the credentials.
666 * Deallocate and clear the cred->security field in a set of credentials.
667 * @cred_prepare:
668 * @new points to the new credentials.
669 * @old points to the original credentials.
670 * @gfp indicates the atomicity of any memory allocations.
671 * Prepare a new set of credentials by copying the data from the old set.
672 * @cred_transfer:
673 * @new points to the new credentials.
674 * @old points to the original credentials.
675 * Transfer data from original creds to new creds
676 * @kernel_act_as:
677 * Set the credentials for a kernel service to act as (subjective context).
678 * @new points to the credentials to be modified.
679 * @secid specifies the security ID to be set
680 * The current task must be the one that nominated @secid.
681 * Return 0 if successful.
682 * @kernel_create_files_as:
683 * Set the file creation context in a set of credentials to be the same as
684 * the objective context of the specified inode.
685 * @new points to the credentials to be modified.
686 * @inode points to the inode to use as a reference.
687 * The current task must be the one that nominated @inode.
688 * Return 0 if successful.
689 * @kernel_module_request:
690 * Ability to trigger the kernel to automatically upcall to userspace for
691 * userspace to load a kernel module with the given name.
692 * @kmod_name name of the module requested by the kernel
693 * Return 0 if successful.
694 * @task_fix_setuid:
695 * Update the module's state after setting one or more of the user
696 * identity attributes of the current process. The @flags parameter
697 * indicates which of the set*uid system calls invoked this hook. If
698 * @new is the set of credentials that will be installed. Modifications
699 * should be made to this rather than to @current->cred.
700 * @old is the set of credentials that are being replaces
701 * @flags contains one of the LSM_SETID_* values.
702 * Return 0 on success.
703 * @task_setpgid:
704 * Check permission before setting the process group identifier of the
705 * process @p to @pgid.
706 * @p contains the task_struct for process being modified.
707 * @pgid contains the new pgid.
708 * Return 0 if permission is granted.
709 * @task_getpgid:
710 * Check permission before getting the process group identifier of the
711 * process @p.
712 * @p contains the task_struct for the process.
713 * Return 0 if permission is granted.
714 * @task_getsid:
715 * Check permission before getting the session identifier of the process
716 * @p.
717 * @p contains the task_struct for the process.
718 * Return 0 if permission is granted.
719 * @task_getsecid:
720 * Retrieve the security identifier of the process @p.
721 * @p contains the task_struct for the process and place is into @secid.
722 * In case of failure, @secid will be set to zero.
723 *
724 * @task_setnice:
725 * Check permission before setting the nice value of @p to @nice.
726 * @p contains the task_struct of process.
727 * @nice contains the new nice value.
728 * Return 0 if permission is granted.
729 * @task_setioprio
730 * Check permission before setting the ioprio value of @p to @ioprio.
731 * @p contains the task_struct of process.
732 * @ioprio contains the new ioprio value
733 * Return 0 if permission is granted.
734 * @task_getioprio
735 * Check permission before getting the ioprio value of @p.
736 * @p contains the task_struct of process.
737 * Return 0 if permission is granted.
738 * @task_setrlimit:
739 * Check permission before setting the resource limits of the current
740 * process for @resource to @new_rlim. The old resource limit values can
741 * be examined by dereferencing (current->signal->rlim + resource).
742 * @resource contains the resource whose limit is being set.
743 * @new_rlim contains the new limits for @resource.
744 * Return 0 if permission is granted.
745 * @task_setscheduler:
746 * Check permission before setting scheduling policy and/or parameters of
747 * process @p based on @policy and @lp.
748 * @p contains the task_struct for process.
749 * @policy contains the scheduling policy.
750 * @lp contains the scheduling parameters.
751 * Return 0 if permission is granted.
752 * @task_getscheduler:
753 * Check permission before obtaining scheduling information for process
754 * @p.
755 * @p contains the task_struct for process.
756 * Return 0 if permission is granted.
757 * @task_movememory
758 * Check permission before moving memory owned by process @p.
759 * @p contains the task_struct for process.
760 * Return 0 if permission is granted.
761 * @task_kill:
762 * Check permission before sending signal @sig to @p. @info can be NULL,
763 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
764 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
765 * from the kernel and should typically be permitted.
766 * SIGIO signals are handled separately by the send_sigiotask hook in
767 * file_security_ops.
768 * @p contains the task_struct for process.
769 * @info contains the signal information.
770 * @sig contains the signal value.
771 * @secid contains the sid of the process where the signal originated
772 * Return 0 if permission is granted.
773 * @task_wait:
774 * Check permission before allowing a process to reap a child process @p
775 * and collect its status information.
776 * @p contains the task_struct for process.
777 * Return 0 if permission is granted.
778 * @task_prctl:
779 * Check permission before performing a process control operation on the
780 * current process.
781 * @option contains the operation.
782 * @arg2 contains a argument.
783 * @arg3 contains a argument.
784 * @arg4 contains a argument.
785 * @arg5 contains a argument.
786 * Return -ENOSYS if no-one wanted to handle this op, any other value to
787 * cause prctl() to return immediately with that value.
788 * @task_to_inode:
789 * Set the security attributes for an inode based on an associated task's
790 * security attributes, e.g. for /proc/pid inodes.
791 * @p contains the task_struct for the task.
792 * @inode contains the inode structure for the inode.
793 *
794 * Security hooks for Netlink messaging.
795 *
796 * @netlink_send:
797 * Save security information for a netlink message so that permission
798 * checking can be performed when the message is processed. The security
799 * information can be saved using the eff_cap field of the
800 * netlink_skb_parms structure. Also may be used to provide fine
801 * grained control over message transmission.
802 * @sk associated sock of task sending the message.
803 * @skb contains the sk_buff structure for the netlink message.
804 * Return 0 if the information was successfully saved and message
805 * is allowed to be transmitted.
806 *
807 * Security hooks for Unix domain networking.
808 *
809 * @unix_stream_connect:
810 * Check permissions before establishing a Unix domain stream connection
811 * between @sock and @other.
812 * @sock contains the sock structure.
813 * @other contains the peer sock structure.
814 * @newsk contains the new sock structure.
815 * Return 0 if permission is granted.
816 * @unix_may_send:
817 * Check permissions before connecting or sending datagrams from @sock to
818 * @other.
819 * @sock contains the socket structure.
820 * @other contains the peer socket structure.
821 * Return 0 if permission is granted.
822 *
823 * The @unix_stream_connect and @unix_may_send hooks were necessary because
824 * Linux provides an alternative to the conventional file name space for Unix
825 * domain sockets. Whereas binding and connecting to sockets in the file name
826 * space is mediated by the typical file permissions (and caught by the mknod
827 * and permission hooks in inode_security_ops), binding and connecting to
828 * sockets in the abstract name space is completely unmediated. Sufficient
829 * control of Unix domain sockets in the abstract name space isn't possible
830 * using only the socket layer hooks, since we need to know the actual target
831 * socket, which is not looked up until we are inside the af_unix code.
832 *
833 * Security hooks for socket operations.
834 *
835 * @socket_create:
836 * Check permissions prior to creating a new socket.
837 * @family contains the requested protocol family.
838 * @type contains the requested communications type.
839 * @protocol contains the requested protocol.
840 * @kern set to 1 if a kernel socket.
841 * Return 0 if permission is granted.
842 * @socket_post_create:
843 * This hook allows a module to update or allocate a per-socket security
844 * structure. Note that the security field was not added directly to the
845 * socket structure, but rather, the socket security information is stored
846 * in the associated inode. Typically, the inode alloc_security hook will
847 * allocate and and attach security information to
848 * sock->inode->i_security. This hook may be used to update the
849 * sock->inode->i_security field with additional information that wasn't
850 * available when the inode was allocated.
851 * @sock contains the newly created socket structure.
852 * @family contains the requested protocol family.
853 * @type contains the requested communications type.
854 * @protocol contains the requested protocol.
855 * @kern set to 1 if a kernel socket.
856 * @socket_bind:
857 * Check permission before socket protocol layer bind operation is
858 * performed and the socket @sock is bound to the address specified in the
859 * @address parameter.
860 * @sock contains the socket structure.
861 * @address contains the address to bind to.
862 * @addrlen contains the length of address.
863 * Return 0 if permission is granted.
864 * @socket_connect:
865 * Check permission before socket protocol layer connect operation
866 * attempts to connect socket @sock to a remote address, @address.
867 * @sock contains the socket structure.
868 * @address contains the address of remote endpoint.
869 * @addrlen contains the length of address.
870 * Return 0 if permission is granted.
871 * @socket_listen:
872 * Check permission before socket protocol layer listen operation.
873 * @sock contains the socket structure.
874 * @backlog contains the maximum length for the pending connection queue.
875 * Return 0 if permission is granted.
876 * @socket_accept:
877 * Check permission before accepting a new connection. Note that the new
878 * socket, @newsock, has been created and some information copied to it,
879 * but the accept operation has not actually been performed.
880 * @sock contains the listening socket structure.
881 * @newsock contains the newly created server socket for connection.
882 * Return 0 if permission is granted.
883 * @socket_sendmsg:
884 * Check permission before transmitting a message to another socket.
885 * @sock contains the socket structure.
886 * @msg contains the message to be transmitted.
887 * @size contains the size of message.
888 * Return 0 if permission is granted.
889 * @socket_recvmsg:
890 * Check permission before receiving a message from a socket.
891 * @sock contains the socket structure.
892 * @msg contains the message structure.
893 * @size contains the size of message structure.
894 * @flags contains the operational flags.
895 * Return 0 if permission is granted.
896 * @socket_getsockname:
897 * Check permission before the local address (name) of the socket object
898 * @sock is retrieved.
899 * @sock contains the socket structure.
900 * Return 0 if permission is granted.
901 * @socket_getpeername:
902 * Check permission before the remote address (name) of a socket object
903 * @sock is retrieved.
904 * @sock contains the socket structure.
905 * Return 0 if permission is granted.
906 * @socket_getsockopt:
907 * Check permissions before retrieving the options associated with socket
908 * @sock.
909 * @sock contains the socket structure.
910 * @level contains the protocol level to retrieve option from.
911 * @optname contains the name of option to retrieve.
912 * Return 0 if permission is granted.
913 * @socket_setsockopt:
914 * Check permissions before setting the options associated with socket
915 * @sock.
916 * @sock contains the socket structure.
917 * @level contains the protocol level to set options for.
918 * @optname contains the name of the option to set.
919 * Return 0 if permission is granted.
920 * @socket_shutdown:
921 * Checks permission before all or part of a connection on the socket
922 * @sock is shut down.
923 * @sock contains the socket structure.
924 * @how contains the flag indicating how future sends and receives are handled.
925 * Return 0 if permission is granted.
926 * @socket_sock_rcv_skb:
927 * Check permissions on incoming network packets. This hook is distinct
928 * from Netfilter's IP input hooks since it is the first time that the
929 * incoming sk_buff @skb has been associated with a particular socket, @sk.
930 * Must not sleep inside this hook because some callers hold spinlocks.
931 * @sk contains the sock (not socket) associated with the incoming sk_buff.
932 * @skb contains the incoming network data.
933 * @socket_getpeersec_stream:
934 * This hook allows the security module to provide peer socket security
935 * state for unix or connected tcp sockets to userspace via getsockopt
936 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
937 * socket is associated with an ipsec SA.
938 * @sock is the local socket.
939 * @optval userspace memory where the security state is to be copied.
940 * @optlen userspace int where the module should copy the actual length
941 * of the security state.
942 * @len as input is the maximum length to copy to userspace provided
943 * by the caller.
944 * Return 0 if all is well, otherwise, typical getsockopt return
945 * values.
946 * @socket_getpeersec_dgram:
947 * This hook allows the security module to provide peer socket security
948 * state for udp sockets on a per-packet basis to userspace via
949 * getsockopt SO_GETPEERSEC. The application must first have indicated
950 * the IP_PASSSEC option via getsockopt. It can then retrieve the
951 * security state returned by this hook for a packet via the SCM_SECURITY
952 * ancillary message type.
953 * @skb is the skbuff for the packet being queried
954 * @secdata is a pointer to a buffer in which to copy the security data
955 * @seclen is the maximum length for @secdata
956 * Return 0 on success, error on failure.
957 * @sk_alloc_security:
958 * Allocate and attach a security structure to the sk->sk_security field,
959 * which is used to copy security attributes between local stream sockets.
960 * @sk_free_security:
961 * Deallocate security structure.
962 * @sk_clone_security:
963 * Clone/copy security structure.
964 * @sk_getsecid:
965 * Retrieve the LSM-specific secid for the sock to enable caching of network
966 * authorizations.
967 * @sock_graft:
968 * Sets the socket's isec sid to the sock's sid.
969 * @inet_conn_request:
970 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
971 * @inet_csk_clone:
972 * Sets the new child socket's sid to the openreq sid.
973 * @inet_conn_established:
974 * Sets the connection's peersid to the secmark on skb.
975 * @secmark_relabel_packet:
976 * check if the process should be allowed to relabel packets to the given secid
977 * @security_secmark_refcount_inc
978 * tells the LSM to increment the number of secmark labeling rules loaded
979 * @security_secmark_refcount_dec
980 * tells the LSM to decrement the number of secmark labeling rules loaded
981 * @req_classify_flow:
982 * Sets the flow's sid to the openreq sid.
983 * @tun_dev_create:
984 * Check permissions prior to creating a new TUN device.
985 * @tun_dev_post_create:
986 * This hook allows a module to update or allocate a per-socket security
987 * structure.
988 * @sk contains the newly created sock structure.
989 * @tun_dev_attach:
990 * Check permissions prior to attaching to a persistent TUN device. This
991 * hook can also be used by the module to update any security state
992 * associated with the TUN device's sock structure.
993 * @sk contains the existing sock structure.
994 *
995 * Security hooks for XFRM operations.
996 *
997 * @xfrm_policy_alloc_security:
998 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
999 * Database used by the XFRM system.
1000 * @sec_ctx contains the security context information being provided by
1001 * the user-level policy update program (e.g., setkey).
1002 * Allocate a security structure to the xp->security field; the security
1003 * field is initialized to NULL when the xfrm_policy is allocated.
1004 * Return 0 if operation was successful (memory to allocate, legal context)
1005 * @xfrm_policy_clone_security:
1006 * @old_ctx contains an existing xfrm_sec_ctx.
1007 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1008 * Allocate a security structure in new_ctxp that contains the
1009 * information from the old_ctx structure.
1010 * Return 0 if operation was successful (memory to allocate).
1011 * @xfrm_policy_free_security:
1012 * @ctx contains the xfrm_sec_ctx
1013 * Deallocate xp->security.
1014 * @xfrm_policy_delete_security:
1015 * @ctx contains the xfrm_sec_ctx.
1016 * Authorize deletion of xp->security.
1017 * @xfrm_state_alloc_security:
1018 * @x contains the xfrm_state being added to the Security Association
1019 * Database by the XFRM system.
1020 * @sec_ctx contains the security context information being provided by
1021 * the user-level SA generation program (e.g., setkey or racoon).
1022 * @secid contains the secid from which to take the mls portion of the context.
1023 * Allocate a security structure to the x->security field; the security
1024 * field is initialized to NULL when the xfrm_state is allocated. Set the
1025 * context to correspond to either sec_ctx or polsec, with the mls portion
1026 * taken from secid in the latter case.
1027 * Return 0 if operation was successful (memory to allocate, legal context).
1028 * @xfrm_state_free_security:
1029 * @x contains the xfrm_state.
1030 * Deallocate x->security.
1031 * @xfrm_state_delete_security:
1032 * @x contains the xfrm_state.
1033 * Authorize deletion of x->security.
1034 * @xfrm_policy_lookup:
1035 * @ctx contains the xfrm_sec_ctx for which the access control is being
1036 * checked.
1037 * @fl_secid contains the flow security label that is used to authorize
1038 * access to the policy xp.
1039 * @dir contains the direction of the flow (input or output).
1040 * Check permission when a flow selects a xfrm_policy for processing
1041 * XFRMs on a packet. The hook is called when selecting either a
1042 * per-socket policy or a generic xfrm policy.
1043 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1044 * on other errors.
1045 * @xfrm_state_pol_flow_match:
1046 * @x contains the state to match.
1047 * @xp contains the policy to check for a match.
1048 * @fl contains the flow to check for a match.
1049 * Return 1 if there is a match.
1050 * @xfrm_decode_session:
1051 * @skb points to skb to decode.
1052 * @secid points to the flow key secid to set.
1053 * @ckall says if all xfrms used should be checked for same secid.
1054 * Return 0 if ckall is zero or all xfrms used have the same secid.
1055 *
1056 * Security hooks affecting all Key Management operations
1057 *
1058 * @key_alloc:
1059 * Permit allocation of a key and assign security data. Note that key does
1060 * not have a serial number assigned at this point.
1061 * @key points to the key.
1062 * @flags is the allocation flags
1063 * Return 0 if permission is granted, -ve error otherwise.
1064 * @key_free:
1065 * Notification of destruction; free security data.
1066 * @key points to the key.
1067 * No return value.
1068 * @key_permission:
1069 * See whether a specific operational right is granted to a process on a
1070 * key.
1071 * @key_ref refers to the key (key pointer + possession attribute bit).
1072 * @cred points to the credentials to provide the context against which to
1073 * evaluate the security data on the key.
1074 * @perm describes the combination of permissions required of this key.
1075 * Return 0 if permission is granted, -ve error otherwise.
1076 * @key_getsecurity:
1077 * Get a textual representation of the security context attached to a key
1078 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1079 * allocates the storage for the NUL-terminated string and the caller
1080 * should free it.
1081 * @key points to the key to be queried.
1082 * @_buffer points to a pointer that should be set to point to the
1083 * resulting string (if no label or an error occurs).
1084 * Return the length of the string (including terminating NUL) or -ve if
1085 * an error.
1086 * May also return 0 (and a NULL buffer pointer) if there is no label.
1087 *
1088 * Security hooks affecting all System V IPC operations.
1089 *
1090 * @ipc_permission:
1091 * Check permissions for access to IPC
1092 * @ipcp contains the kernel IPC permission structure
1093 * @flag contains the desired (requested) permission set
1094 * Return 0 if permission is granted.
1095 * @ipc_getsecid:
1096 * Get the secid associated with the ipc object.
1097 * @ipcp contains the kernel IPC permission structure.
1098 * @secid contains a pointer to the location where result will be saved.
1099 * In case of failure, @secid will be set to zero.
1100 *
1101 * Security hooks for individual messages held in System V IPC message queues
1102 * @msg_msg_alloc_security:
1103 * Allocate and attach a security structure to the msg->security field.
1104 * The security field is initialized to NULL when the structure is first
1105 * created.
1106 * @msg contains the message structure to be modified.
1107 * Return 0 if operation was successful and permission is granted.
1108 * @msg_msg_free_security:
1109 * Deallocate the security structure for this message.
1110 * @msg contains the message structure to be modified.
1111 *
1112 * Security hooks for System V IPC Message Queues
1113 *
1114 * @msg_queue_alloc_security:
1115 * Allocate and attach a security structure to the
1116 * msq->q_perm.security field. The security field is initialized to
1117 * NULL when the structure is first created.
1118 * @msq contains the message queue structure to be modified.
1119 * Return 0 if operation was successful and permission is granted.
1120 * @msg_queue_free_security:
1121 * Deallocate security structure for this message queue.
1122 * @msq contains the message queue structure to be modified.
1123 * @msg_queue_associate:
1124 * Check permission when a message queue is requested through the
1125 * msgget system call. This hook is only called when returning the
1126 * message queue identifier for an existing message queue, not when a
1127 * new message queue is created.
1128 * @msq contains the message queue to act upon.
1129 * @msqflg contains the operation control flags.
1130 * Return 0 if permission is granted.
1131 * @msg_queue_msgctl:
1132 * Check permission when a message control operation specified by @cmd
1133 * is to be performed on the message queue @msq.
1134 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1135 * @msq contains the message queue to act upon. May be NULL.
1136 * @cmd contains the operation to be performed.
1137 * Return 0 if permission is granted.
1138 * @msg_queue_msgsnd:
1139 * Check permission before a message, @msg, is enqueued on the message
1140 * queue, @msq.
1141 * @msq contains the message queue to send message to.
1142 * @msg contains the message to be enqueued.
1143 * @msqflg contains operational flags.
1144 * Return 0 if permission is granted.
1145 * @msg_queue_msgrcv:
1146 * Check permission before a message, @msg, is removed from the message
1147 * queue, @msq. The @target task structure contains a pointer to the
1148 * process that will be receiving the message (not equal to the current
1149 * process when inline receives are being performed).
1150 * @msq contains the message queue to retrieve message from.
1151 * @msg contains the message destination.
1152 * @target contains the task structure for recipient process.
1153 * @type contains the type of message requested.
1154 * @mode contains the operational flags.
1155 * Return 0 if permission is granted.
1156 *
1157 * Security hooks for System V Shared Memory Segments
1158 *
1159 * @shm_alloc_security:
1160 * Allocate and attach a security structure to the shp->shm_perm.security
1161 * field. The security field is initialized to NULL when the structure is
1162 * first created.
1163 * @shp contains the shared memory structure to be modified.
1164 * Return 0 if operation was successful and permission is granted.
1165 * @shm_free_security:
1166 * Deallocate the security struct for this memory segment.
1167 * @shp contains the shared memory structure to be modified.
1168 * @shm_associate:
1169 * Check permission when a shared memory region is requested through the
1170 * shmget system call. This hook is only called when returning the shared
1171 * memory region identifier for an existing region, not when a new shared
1172 * memory region is created.
1173 * @shp contains the shared memory structure to be modified.
1174 * @shmflg contains the operation control flags.
1175 * Return 0 if permission is granted.
1176 * @shm_shmctl:
1177 * Check permission when a shared memory control operation specified by
1178 * @cmd is to be performed on the shared memory region @shp.
1179 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1180 * @shp contains shared memory structure to be modified.
1181 * @cmd contains the operation to be performed.
1182 * Return 0 if permission is granted.
1183 * @shm_shmat:
1184 * Check permissions prior to allowing the shmat system call to attach the
1185 * shared memory segment @shp to the data segment of the calling process.
1186 * The attaching address is specified by @shmaddr.
1187 * @shp contains the shared memory structure to be modified.
1188 * @shmaddr contains the address to attach memory region to.
1189 * @shmflg contains the operational flags.
1190 * Return 0 if permission is granted.
1191 *
1192 * Security hooks for System V Semaphores
1193 *
1194 * @sem_alloc_security:
1195 * Allocate and attach a security structure to the sma->sem_perm.security
1196 * field. The security field is initialized to NULL when the structure is
1197 * first created.
1198 * @sma contains the semaphore structure
1199 * Return 0 if operation was successful and permission is granted.
1200 * @sem_free_security:
1201 * deallocate security struct for this semaphore
1202 * @sma contains the semaphore structure.
1203 * @sem_associate:
1204 * Check permission when a semaphore is requested through the semget
1205 * system call. This hook is only called when returning the semaphore
1206 * identifier for an existing semaphore, not when a new one must be
1207 * created.
1208 * @sma contains the semaphore structure.
1209 * @semflg contains the operation control flags.
1210 * Return 0 if permission is granted.
1211 * @sem_semctl:
1212 * Check permission when a semaphore operation specified by @cmd is to be
1213 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1214 * IPC_INFO or SEM_INFO.
1215 * @sma contains the semaphore structure. May be NULL.
1216 * @cmd contains the operation to be performed.
1217 * Return 0 if permission is granted.
1218 * @sem_semop
1219 * Check permissions before performing operations on members of the
1220 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1221 * may be modified.
1222 * @sma contains the semaphore structure.
1223 * @sops contains the operations to perform.
1224 * @nsops contains the number of operations to perform.
1225 * @alter contains the flag indicating whether changes are to be made.
1226 * Return 0 if permission is granted.
1227 *
1228 * @ptrace_access_check:
1229 * Check permission before allowing the current process to trace the
1230 * @child process.
1231 * Security modules may also want to perform a process tracing check
1232 * during an execve in the set_security or apply_creds hooks of
1233 * tracing check during an execve in the bprm_set_creds hook of
1234 * binprm_security_ops if the process is being traced and its security
1235 * attributes would be changed by the execve.
1236 * @child contains the task_struct structure for the target process.
1237 * @mode contains the PTRACE_MODE flags indicating the form of access.
1238 * Return 0 if permission is granted.
1239 * @ptrace_traceme:
1240 * Check that the @parent process has sufficient permission to trace the
1241 * current process before allowing the current process to present itself
1242 * to the @parent process for tracing.
1243 * The parent process will still have to undergo the ptrace_access_check
1244 * checks before it is allowed to trace this one.
1245 * @parent contains the task_struct structure for debugger process.
1246 * Return 0 if permission is granted.
1247 * @capget:
1248 * Get the @effective, @inheritable, and @permitted capability sets for
1249 * the @target process. The hook may also perform permission checking to
1250 * determine if the current process is allowed to see the capability sets
1251 * of the @target process.
1252 * @target contains the task_struct structure for target process.
1253 * @effective contains the effective capability set.
1254 * @inheritable contains the inheritable capability set.
1255 * @permitted contains the permitted capability set.
1256 * Return 0 if the capability sets were successfully obtained.
1257 * @capset:
1258 * Set the @effective, @inheritable, and @permitted capability sets for
1259 * the current process.
1260 * @new contains the new credentials structure for target process.
1261 * @old contains the current credentials structure for target process.
1262 * @effective contains the effective capability set.
1263 * @inheritable contains the inheritable capability set.
1264 * @permitted contains the permitted capability set.
1265 * Return 0 and update @new if permission is granted.
1266 * @capable:
1267 * Check whether the @tsk process has the @cap capability in the indicated
1268 * credentials.
1269 * @cred contains the credentials to use.
1270 * @ns contains the user namespace we want the capability in
1271 * @cap contains the capability <include/linux/capability.h>.
1272 * @audit: Whether to write an audit message or not
1273 * Return 0 if the capability is granted for @tsk.
1274 * @syslog:
1275 * Check permission before accessing the kernel message ring or changing
1276 * logging to the console.
1277 * See the syslog(2) manual page for an explanation of the @type values.
1278 * @type contains the type of action.
1279 * @from_file indicates the context of action (if it came from /proc).
1280 * Return 0 if permission is granted.
1281 * @settime:
1282 * Check permission to change the system time.
1283 * struct timespec and timezone are defined in include/linux/time.h
1284 * @ts contains new time
1285 * @tz contains new timezone
1286 * Return 0 if permission is granted.
1287 * @vm_enough_memory:
1288 * Check permissions for allocating a new virtual mapping.
1289 * @mm contains the mm struct it is being added to.
1290 * @pages contains the number of pages.
1291 * Return 0 if permission is granted.
1292 *
1293 * @secid_to_secctx:
1294 * Convert secid to security context. If secdata is NULL the length of
1295 * the result will be returned in seclen, but no secdata will be returned.
1296 * This does mean that the length could change between calls to check the
1297 * length and the next call which actually allocates and returns the secdata.
1298 * @secid contains the security ID.
1299 * @secdata contains the pointer that stores the converted security context.
1300 * @seclen pointer which contains the length of the data
1301 * @secctx_to_secid:
1302 * Convert security context to secid.
1303 * @secid contains the pointer to the generated security ID.
1304 * @secdata contains the security context.
1305 *
1306 * @release_secctx:
1307 * Release the security context.
1308 * @secdata contains the security context.
1309 * @seclen contains the length of the security context.
1310 *
1311 * Security hooks for Audit
1312 *
1313 * @audit_rule_init:
1314 * Allocate and initialize an LSM audit rule structure.
1315 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1316 * @op contains the operator the rule uses.
1317 * @rulestr contains the context where the rule will be applied to.
1318 * @lsmrule contains a pointer to receive the result.
1319 * Return 0 if @lsmrule has been successfully set,
1320 * -EINVAL in case of an invalid rule.
1321 *
1322 * @audit_rule_known:
1323 * Specifies whether given @rule contains any fields related to current LSM.
1324 * @rule contains the audit rule of interest.
1325 * Return 1 in case of relation found, 0 otherwise.
1326 *
1327 * @audit_rule_match:
1328 * Determine if given @secid matches a rule previously approved
1329 * by @audit_rule_known.
1330 * @secid contains the security id in question.
1331 * @field contains the field which relates to current LSM.
1332 * @op contains the operator that will be used for matching.
1333 * @rule points to the audit rule that will be checked against.
1334 * @actx points to the audit context associated with the check.
1335 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1336 *
1337 * @audit_rule_free:
1338 * Deallocate the LSM audit rule structure previously allocated by
1339 * audit_rule_init.
1340 * @rule contains the allocated rule
1341 *
1342 * @inode_notifysecctx:
1343 * Notify the security module of what the security context of an inode
1344 * should be. Initializes the incore security context managed by the
1345 * security module for this inode. Example usage: NFS client invokes
1346 * this hook to initialize the security context in its incore inode to the
1347 * value provided by the server for the file when the server returned the
1348 * file's attributes to the client.
1349 *
1350 * Must be called with inode->i_mutex locked.
1351 *
1352 * @inode we wish to set the security context of.
1353 * @ctx contains the string which we wish to set in the inode.
1354 * @ctxlen contains the length of @ctx.
1355 *
1356 * @inode_setsecctx:
1357 * Change the security context of an inode. Updates the
1358 * incore security context managed by the security module and invokes the
1359 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1360 * xattrs that represent the context. Example usage: NFS server invokes
1361 * this hook to change the security context in its incore inode and on the
1362 * backing filesystem to a value provided by the client on a SETATTR
1363 * operation.
1364 *
1365 * Must be called with inode->i_mutex locked.
1366 *
1367 * @dentry contains the inode we wish to set the security context of.
1368 * @ctx contains the string which we wish to set in the inode.
1369 * @ctxlen contains the length of @ctx.
1370 *
1371 * @inode_getsecctx:
1372 * Returns a string containing all relevant security context information
1373 *
1374 * @inode we wish to get the security context of.
1375 * @ctx is a pointer in which to place the allocated security context.
1376 * @ctxlen points to the place to put the length of @ctx.
1377 * This is the main security structure.
1378 */
1424 #ifdef CONFIG_SECURITY_PATH
1440 #endif
1474 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1475 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1505 gfp_t gfp);
1577 #ifdef CONFIG_SECURITY_NETWORK
1600 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1620 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1623 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1628 u32 secid);
1638 /* key management security hooks */
1639 #ifdef CONFIG_KEYS
1644 key_perm_t perm);
1648 #ifdef CONFIG_AUDIT
1655 };
1657 /* prototypes */
1664 /* Security operations */
1738 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1739 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1823 };
1826 {
1827 }
1830 {
1831 }
1833 /*
1834 * This is the default capabilities functionality. Most of these functions
1835 * are just stubbed out, but a few must call the proper capable code.
1836 */
1839 {
1841 }
1845 {
1847 }
1850 {
1852 }
1858 {
1860 }
1867 {
1869 }
1873 {
1875 }
1880 }
1884 {
1886 }
1889 {
1891 }
1894 {
1896 }
1900 {
1902 }
1905 {
1907 }
1910 {
1912 }
1915 {
1917 }
1920 {
1921 }
1924 {
1925 }
1928 {
1930 }
1933 {
1935 }
1938 { }
1941 {
1943 }
1946 {
1948 }
1951 {
1953 }
1957 {
1959 }
1962 {
1964 }
1969 {
1971 }
1974 {
1976 }
1980 {
1982 }
1986 {
1988 }
1992 { }
1995 {
1997 }
2000 {
2002 }
2005 { }
2012 {
2014 }
2021 {
2023 }
2027 umode_t mode)
2028 {
2030 }
2035 {
2037 }
2041 {
2043 }
2048 {
2050 }
2055 {
2057 }
2061 {
2063 }
2068 {
2070 }
2076 {
2078 }
2081 {
2083 }
2087 {
2089 }
2092 {
2094 }
2098 {
2100 }
2104 {
2106 }
2110 {
2112 }
2116 { }
2120 {
2122 }
2125 {
2127 }
2131 {
2133 }
2136 {
2138 }
2141 {
2143 }
2145 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2146 {
2148 }
2150 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2151 {
2153 }
2155 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2156 {
2158 }
2161 {
2163 }
2166 {
2168 }
2171 {
2173 }
2176 { }
2180 {
2182 }
2189 {
2191 }
2196 {
2198 }
2201 {
2203 }
2207 {
2209 }
2212 {
2214 }
2219 {
2221 }
2224 {
2226 }
2230 {
2232 }
2235 {
2237 }
2240 { }
2243 {
2245 }
2248 { }
2252 gfp_t gfp)
2253 {
2255 }
2259 {
2260 }
2263 {
2265 }
2269 {
2271 }
2274 {
2276 }
2281 {
2283 }
2286 {
2288 }
2291 {
2293 }
2296 {
2298 }
2301 {
2303 }
2306 {
2308 }
2311 {
2313 }
2316 {
2318 }
2323 {
2325 }
2328 {
2330 }
2333 {
2335 }
2338 {
2340 }
2344 u32 secid)
2345 {
2347 }
2350 {
2352 }
2358 {
2360 }
2363 { }
2367 {
2369 }
2372 {
2374 }
2377 {
2379 }
2382 { }
2385 {
2387 }
2390 { }
2394 {
2396 }
2399 {
2401 }
2405 {
2407 }
2413 {
2415 }
2418 {
2420 }
2423 { }
2427 {
2429 }
2432 {
2434 }
2438 {
2440 }
2443 {
2445 }
2448 { }
2451 {
2453 }
2456 {
2458 }
2463 {
2465 }
2468 { }
2471 {
2473 }
2475 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2476 {
2478 }
2481 {
2483 }
2486 {
2488 }
2491 u32 seclen,
2493 {
2495 }
2498 {
2499 }
2502 {
2504 }
2506 {
2508 }
2510 {
2512 }
2515 #ifdef CONFIG_SECURITY_NETWORK
2561 {
2563 }
2567 {
2569 }
2573 {
2575 }
2581 {
2583 }
2588 {
2590 }
2595 {
2597 }
2600 {
2602 }
2606 {
2608 }
2612 {
2614 }
2619 {
2621 }
2624 {
2626 }
2629 {
2631 }
2635 {
2637 }
2641 {
2643 }
2646 {
2648 }
2651 {
2653 }
2657 {
2659 }
2661 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2662 {
2664 }
2667 {
2669 }
2672 {
2673 }
2676 {
2677 }
2680 {
2681 }
2683 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2684 {
2685 }
2688 {
2689 }
2693 {
2695 }
2699 {
2700 }
2704 {
2705 }
2708 {
2710 }
2713 {
2714 }
2717 {
2718 }
2721 {
2723 }
2726 {
2727 }
2730 {
2732 }
2735 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2755 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2756 {
2758 }
2760 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2761 {
2763 }
2766 {
2767 }
2770 {
2772 }
2776 {
2778 }
2782 {
2784 }
2787 {
2788 }
2791 {
2793 }
2796 {
2798 }
2802 {
2804 }
2807 {
2809 }
2812 {
2813 }
2817 #ifdef CONFIG_SECURITY_PATH
2835 {
2837 }
2840 umode_t mode)
2841 {
2843 }
2846 {
2848 }
2852 {
2854 }
2857 {
2859 }
2863 {
2865 }
2870 {
2872 }
2878 {
2880 }
2883 {
2885 }
2888 {
2890 }
2893 {
2895 }
2898 #ifdef CONFIG_KEYS
2899 #ifdef CONFIG_SECURITY
2907 #else
2912 {
2914 }
2917 {
2918 }
2922 key_perm_t perm)
2923 {
2925 }
2928 {
2931 }
2933 #endif
2936 #ifdef CONFIG_AUDIT
2937 #ifdef CONFIG_SECURITY
2944 #else
2948 {
2950 }
2953 {
2955 }
2959 {
2961 }
2964 { }
2969 #ifdef CONFIG_SECURITYFS
2981 {
2983 }
2986 umode_t mode,
2990 {
2992 }
2995 {}
2997 #endif
2999 #ifdef CONFIG_SECURITY
3002 {
3004 }
3007 {
3009 }
3011 #else
3014 {
3016 }
3019 { }