| blob | 8ce59ef3e5afbec48b903e5f8d3cd4318096f709 |
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 <net/flow.h>
41 /* Maximum number of letters for an LSM name string */
42 #define SECURITY_NAME_MAX 10
44 /* If capable should audit the security request */
45 #define SECURITY_CAP_NOAUDIT 0
46 #define SECURITY_CAP_AUDIT 1
52 /*
53 * These functions are in security/capability.c and are used
54 * as the default capabilities functions
55 */
61 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 #ifdef CONFIG_SECURITY
156 };
159 {
163 }
166 {
176 }
178 /**
179 * struct security_operations - main security structure
180 *
181 * Security module identifier.
182 *
183 * @name:
184 * A string that acts as a unique identifeir for the LSM with max number
185 * of characters = SECURITY_NAME_MAX.
186 *
187 * Security hooks for program execution operations.
188 *
189 * @bprm_set_creds:
190 * Save security information in the bprm->security field, typically based
191 * on information about the bprm->file, for later use by the apply_creds
192 * hook. This hook may also optionally check permissions (e.g. for
193 * transitions between security domains).
194 * This hook may be called multiple times during a single execve, e.g. for
195 * interpreters. The hook can tell whether it has already been called by
196 * checking to see if @bprm->security is non-NULL. If so, then the hook
197 * may decide either to retain the security information saved earlier or
198 * to replace it.
199 * @bprm contains the linux_binprm structure.
200 * Return 0 if the hook is successful and permission is granted.
201 * @bprm_check_security:
202 * This hook mediates the point when a search for a binary handler will
203 * begin. It allows a check the @bprm->security value which is set in the
204 * preceding set_creds call. The primary difference from set_creds is
205 * that the argv list and envp list are reliably available in @bprm. This
206 * hook may be called multiple times during a single execve; and in each
207 * pass set_creds is called first.
208 * @bprm contains the linux_binprm structure.
209 * Return 0 if the hook is successful and permission is granted.
210 * @bprm_committing_creds:
211 * Prepare to install the new security attributes of a process being
212 * transformed by an execve operation, based on the old credentials
213 * pointed to by @current->cred and the information set in @bprm->cred by
214 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
215 * This hook is a good place to perform state changes on the process such
216 * as closing open file descriptors to which access will no longer be
217 * granted when the attributes are changed. This is called immediately
218 * before commit_creds().
219 * @bprm_committed_creds:
220 * Tidy up after the installation of the new security attributes of a
221 * process being transformed by an execve operation. The new credentials
222 * have, by this point, been set to @current->cred. @bprm points to the
223 * linux_binprm structure. This hook is a good place to perform state
224 * changes on the process such as clearing out non-inheritable signal
225 * state. This is called immediately after commit_creds().
226 * @bprm_secureexec:
227 * Return a boolean value (0 or 1) indicating whether a "secure exec"
228 * is required. The flag is passed in the auxiliary table
229 * on the initial stack to the ELF interpreter to indicate whether libc
230 * should enable secure mode.
231 * @bprm contains the linux_binprm structure.
232 *
233 * Security hooks for filesystem operations.
234 *
235 * @sb_alloc_security:
236 * Allocate and attach a security structure to the sb->s_security field.
237 * The s_security field is initialized to NULL when the structure is
238 * allocated.
239 * @sb contains the super_block structure to be modified.
240 * Return 0 if operation was successful.
241 * @sb_free_security:
242 * Deallocate and clear the sb->s_security field.
243 * @sb contains the super_block structure to be modified.
244 * @sb_statfs:
245 * Check permission before obtaining filesystem statistics for the @mnt
246 * mountpoint.
247 * @dentry is a handle on the superblock for the filesystem.
248 * Return 0 if permission is granted.
249 * @sb_mount:
250 * Check permission before an object specified by @dev_name is mounted on
251 * the mount point named by @nd. For an ordinary mount, @dev_name
252 * identifies a device if the file system type requires a device. For a
253 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
254 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
255 * pathname of the object being mounted.
256 * @dev_name contains the name for object being mounted.
257 * @path contains the path for mount point object.
258 * @type contains the filesystem type.
259 * @flags contains the mount flags.
260 * @data contains the filesystem-specific data.
261 * Return 0 if permission is granted.
262 * @sb_copy_data:
263 * Allow mount option data to be copied prior to parsing by the filesystem,
264 * so that the security module can extract security-specific mount
265 * options cleanly (a filesystem may modify the data e.g. with strsep()).
266 * This also allows the original mount data to be stripped of security-
267 * specific options to avoid having to make filesystems aware of them.
268 * @type the type of filesystem being mounted.
269 * @orig the original mount data copied from userspace.
270 * @copy copied data which will be passed to the security module.
271 * Returns 0 if the copy was successful.
272 * @sb_remount:
273 * Extracts security system specifc mount options and verifys no changes
274 * are being made to those options.
275 * @sb superblock being remounted
276 * @data contains the filesystem-specific data.
277 * Return 0 if permission is granted.
278 * @sb_umount:
279 * Check permission before the @mnt file system is unmounted.
280 * @mnt contains the mounted file system.
281 * @flags contains the unmount flags, e.g. MNT_FORCE.
282 * Return 0 if permission is granted.
283 * @sb_pivotroot:
284 * Check permission before pivoting the root filesystem.
285 * @old_path contains the path for the new location of the current root (put_old).
286 * @new_path contains the path for the new root (new_root).
287 * Return 0 if permission is granted.
288 * @sb_set_mnt_opts:
289 * Set the security relevant mount options used for a superblock
290 * @sb the superblock to set security mount options for
291 * @opts binary data structure containing all lsm mount data
292 * @sb_clone_mnt_opts:
293 * Copy all security options from a given superblock to another
294 * @oldsb old superblock which contain information to clone
295 * @newsb new superblock which needs filled in
296 * @sb_parse_opts_str:
297 * Parse a string of security data filling in the opts structure
298 * @options string containing all mount options known by the LSM
299 * @opts binary data structure usable by the LSM
300 *
301 * Security hooks for inode operations.
302 *
303 * @inode_alloc_security:
304 * Allocate and attach a security structure to @inode->i_security. The
305 * i_security field is initialized to NULL when the inode structure is
306 * allocated.
307 * @inode contains the inode structure.
308 * Return 0 if operation was successful.
309 * @inode_free_security:
310 * @inode contains the inode structure.
311 * Deallocate the inode security structure and set @inode->i_security to
312 * NULL.
313 * @inode_init_security:
314 * Obtain the security attribute name suffix and value to set on a newly
315 * created inode and set up the incore security field for the new inode.
316 * This hook is called by the fs code as part of the inode creation
317 * transaction and provides for atomic labeling of the inode, unlike
318 * the post_create/mkdir/... hooks called by the VFS. The hook function
319 * is expected to allocate the name and value via kmalloc, with the caller
320 * being responsible for calling kfree after using them.
321 * If the security module does not use security attributes or does
322 * not wish to put a security attribute on this particular inode,
323 * then it should return -EOPNOTSUPP to skip this processing.
324 * @inode contains the inode structure of the newly created inode.
325 * @dir contains the inode structure of the parent directory.
326 * @qstr contains the last path component of the new object
327 * @name will be set to the allocated name suffix (e.g. selinux).
328 * @value will be set to the allocated attribute value.
329 * @len will be set to the length of the value.
330 * Returns 0 if @name and @value have been successfully set,
331 * -EOPNOTSUPP if no security attribute is needed, or
332 * -ENOMEM on memory allocation failure.
333 * @inode_create:
334 * Check permission to create a regular file.
335 * @dir contains inode structure of the parent of the new file.
336 * @dentry contains the dentry structure for the file to be created.
337 * @mode contains the file mode of the file to be created.
338 * Return 0 if permission is granted.
339 * @inode_link:
340 * Check permission before creating a new hard link to a file.
341 * @old_dentry contains the dentry structure for an existing link to the file.
342 * @dir contains the inode structure of the parent directory of the new link.
343 * @new_dentry contains the dentry structure for the new link.
344 * Return 0 if permission is granted.
345 * @path_link:
346 * Check permission before creating a new hard link to a file.
347 * @old_dentry contains the dentry structure for an existing link
348 * to the file.
349 * @new_dir contains the path structure of the parent directory of
350 * the new link.
351 * @new_dentry contains the dentry structure for the new link.
352 * Return 0 if permission is granted.
353 * @inode_unlink:
354 * Check the permission to remove a hard link to a file.
355 * @dir contains the inode structure of parent directory of the file.
356 * @dentry contains the dentry structure for file to be unlinked.
357 * Return 0 if permission is granted.
358 * @path_unlink:
359 * Check the permission to remove a hard link to a file.
360 * @dir contains the path structure of parent directory of the file.
361 * @dentry contains the dentry structure for file to be unlinked.
362 * Return 0 if permission is granted.
363 * @inode_symlink:
364 * Check the permission to create a symbolic link to a file.
365 * @dir contains the inode structure of parent directory of the symbolic link.
366 * @dentry contains the dentry structure of the symbolic link.
367 * @old_name contains the pathname of file.
368 * Return 0 if permission is granted.
369 * @path_symlink:
370 * Check the permission to create a symbolic link to a file.
371 * @dir contains the path structure of parent directory of
372 * the symbolic link.
373 * @dentry contains the dentry structure of the symbolic link.
374 * @old_name contains the pathname of file.
375 * Return 0 if permission is granted.
376 * @inode_mkdir:
377 * Check permissions to create a new directory in the existing directory
378 * associated with inode strcture @dir.
379 * @dir containst the inode structure of parent of the directory to be created.
380 * @dentry contains the dentry structure of new directory.
381 * @mode contains the mode of new directory.
382 * Return 0 if permission is granted.
383 * @path_mkdir:
384 * Check permissions to create a new directory in the existing directory
385 * associated with path strcture @path.
386 * @dir containst the path structure of parent of the directory
387 * 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 * @inode_rmdir:
392 * Check the permission to remove a directory.
393 * @dir contains the inode structure of parent of the directory to be removed.
394 * @dentry contains the dentry structure of directory to be removed.
395 * Return 0 if permission is granted.
396 * @path_rmdir:
397 * Check the permission to remove a directory.
398 * @dir contains the path structure of parent of the directory to be
399 * removed.
400 * @dentry contains the dentry structure of directory to be removed.
401 * Return 0 if permission is granted.
402 * @inode_mknod:
403 * Check permissions when creating a special file (or a socket or a fifo
404 * file created via the mknod system call). Note that if mknod operation
405 * is being done for a regular file, then the create hook will be called
406 * and not this hook.
407 * @dir contains the inode structure of parent of the new file.
408 * @dentry contains the dentry structure of the new file.
409 * @mode contains the mode of the new file.
410 * @dev contains the device number.
411 * Return 0 if permission is granted.
412 * @path_mknod:
413 * Check permissions when creating a file. Note that this hook is called
414 * even if mknod operation is being done for a regular file.
415 * @dir contains the path 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 undecoded device number. Use new_decode_dev() to get
419 * the decoded device number.
420 * Return 0 if permission is granted.
421 * @inode_rename:
422 * Check for permission to rename a file or directory.
423 * @old_dir contains the inode structure for parent of the old link.
424 * @old_dentry contains the dentry structure of the old link.
425 * @new_dir contains the inode structure for parent of the new link.
426 * @new_dentry contains the dentry structure of the new link.
427 * Return 0 if permission is granted.
428 * @path_rename:
429 * Check for permission to rename a file or directory.
430 * @old_dir contains the path structure for parent of the old link.
431 * @old_dentry contains the dentry structure of the old link.
432 * @new_dir contains the path structure for parent of the new link.
433 * @new_dentry contains the dentry structure of the new link.
434 * Return 0 if permission is granted.
435 * @path_chmod:
436 * Check for permission to change DAC's permission of a file or directory.
437 * @dentry contains the dentry structure.
438 * @mnt contains the vfsmnt structure.
439 * @mode contains DAC's mode.
440 * Return 0 if permission is granted.
441 * @path_chown:
442 * Check for permission to change owner/group of a file or directory.
443 * @path contains the path structure.
444 * @uid contains new owner's ID.
445 * @gid contains new group's ID.
446 * Return 0 if permission is granted.
447 * @path_chroot:
448 * Check for permission to change root directory.
449 * @path contains the path structure.
450 * Return 0 if permission is granted.
451 * @inode_readlink:
452 * Check the permission to read the symbolic link.
453 * @dentry contains the dentry structure for the file link.
454 * Return 0 if permission is granted.
455 * @inode_follow_link:
456 * Check permission to follow a symbolic link when looking up a pathname.
457 * @dentry contains the dentry structure for the link.
458 * @nd contains the nameidata structure for the parent directory.
459 * Return 0 if permission is granted.
460 * @inode_permission:
461 * Check permission before accessing an inode. This hook is called by the
462 * existing Linux permission function, so a security module can use it to
463 * provide additional checking for existing Linux permission checks.
464 * Notice that this hook is called when a file is opened (as well as many
465 * other operations), whereas the file_security_ops permission hook is
466 * called when the actual read/write operations are performed.
467 * @inode contains the inode structure to check.
468 * @mask contains the permission mask.
469 * Return 0 if permission is granted.
470 * @inode_setattr:
471 * Check permission before setting file attributes. Note that the kernel
472 * call to notify_change is performed from several locations, whenever
473 * file attributes change (such as when a file is truncated, chown/chmod
474 * operations, transferring disk quotas, etc).
475 * @dentry contains the dentry structure for the file.
476 * @attr is the iattr structure containing the new file attributes.
477 * Return 0 if permission is granted.
478 * @path_truncate:
479 * Check permission before truncating a file.
480 * @path contains the path structure for the file.
481 * Return 0 if permission is granted.
482 * @inode_getattr:
483 * Check permission before obtaining file attributes.
484 * @mnt is the vfsmount where the dentry was looked up
485 * @dentry contains the dentry structure for the file.
486 * Return 0 if permission is granted.
487 * @inode_setxattr:
488 * Check permission before setting the extended attributes
489 * @value identified by @name for @dentry.
490 * Return 0 if permission is granted.
491 * @inode_post_setxattr:
492 * Update inode security field after successful setxattr operation.
493 * @value identified by @name for @dentry.
494 * @inode_getxattr:
495 * Check permission before obtaining the extended attributes
496 * identified by @name for @dentry.
497 * Return 0 if permission is granted.
498 * @inode_listxattr:
499 * Check permission before obtaining the list of extended attribute
500 * names for @dentry.
501 * Return 0 if permission is granted.
502 * @inode_removexattr:
503 * Check permission before removing the extended attribute
504 * identified by @name for @dentry.
505 * Return 0 if permission is granted.
506 * @inode_getsecurity:
507 * Retrieve a copy of the extended attribute representation of the
508 * security label associated with @name for @inode via @buffer. Note that
509 * @name is the remainder of the attribute name after the security prefix
510 * has been removed. @alloc is used to specify of the call should return a
511 * value via the buffer or just the value length Return size of buffer on
512 * success.
513 * @inode_setsecurity:
514 * Set the security label associated with @name for @inode from the
515 * extended attribute value @value. @size indicates the size of the
516 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
517 * Note that @name is the remainder of the attribute name after the
518 * security. prefix has been removed.
519 * Return 0 on success.
520 * @inode_listsecurity:
521 * Copy the extended attribute names for the security labels
522 * associated with @inode into @buffer. The maximum size of @buffer
523 * is specified by @buffer_size. @buffer may be NULL to request
524 * the size of the buffer required.
525 * Returns number of bytes used/required on success.
526 * @inode_need_killpriv:
527 * Called when an inode has been changed.
528 * @dentry is the dentry being changed.
529 * Return <0 on error to abort the inode change operation.
530 * Return 0 if inode_killpriv does not need to be called.
531 * Return >0 if inode_killpriv does need to be called.
532 * @inode_killpriv:
533 * The setuid bit is being removed. Remove similar security labels.
534 * Called with the dentry->d_inode->i_mutex held.
535 * @dentry is the dentry being changed.
536 * Return 0 on success. If error is returned, then the operation
537 * causing setuid bit removal is failed.
538 * @inode_getsecid:
539 * Get the secid associated with the node.
540 * @inode contains a pointer to the inode.
541 * @secid contains a pointer to the location where result will be saved.
542 * In case of failure, @secid will be set to zero.
543 *
544 * Security hooks for file operations
545 *
546 * @file_permission:
547 * Check file permissions before accessing an open file. This hook is
548 * called by various operations that read or write files. A security
549 * module can use this hook to perform additional checking on these
550 * operations, e.g. to revalidate permissions on use to support privilege
551 * bracketing or policy changes. Notice that this hook is used when the
552 * actual read/write operations are performed, whereas the
553 * inode_security_ops hook is called when a file is opened (as well as
554 * many other operations).
555 * Caveat: Although this hook can be used to revalidate permissions for
556 * various system call operations that read or write files, it does not
557 * address the revalidation of permissions for memory-mapped files.
558 * Security modules must handle this separately if they need such
559 * revalidation.
560 * @file contains the file structure being accessed.
561 * @mask contains the requested permissions.
562 * Return 0 if permission is granted.
563 * @file_alloc_security:
564 * Allocate and attach a security structure to the file->f_security field.
565 * The security field is initialized to NULL when the structure is first
566 * created.
567 * @file contains the file structure to secure.
568 * Return 0 if the hook is successful and permission is granted.
569 * @file_free_security:
570 * Deallocate and free any security structures stored in file->f_security.
571 * @file contains the file structure being modified.
572 * @file_ioctl:
573 * @file contains the file structure.
574 * @cmd contains the operation to perform.
575 * @arg contains the operational arguments.
576 * Check permission for an ioctl operation on @file. Note that @arg can
577 * sometimes represents a user space pointer; in other cases, it may be a
578 * simple integer value. When @arg represents a user space pointer, it
579 * should never be used by the security module.
580 * Return 0 if permission is granted.
581 * @file_mmap :
582 * Check permissions for a mmap operation. The @file may be NULL, e.g.
583 * if mapping anonymous memory.
584 * @file contains the file structure for file to map (may be NULL).
585 * @reqprot contains the protection requested by the application.
586 * @prot contains the protection that will be applied by the kernel.
587 * @flags contains the operational flags.
588 * Return 0 if permission is granted.
589 * @file_mprotect:
590 * Check permissions before changing memory access permissions.
591 * @vma contains the memory region to modify.
592 * @reqprot contains the protection requested by the application.
593 * @prot contains the protection that will be applied by the kernel.
594 * Return 0 if permission is granted.
595 * @file_lock:
596 * Check permission before performing file locking operations.
597 * Note: this hook mediates both flock and fcntl style locks.
598 * @file contains the file structure.
599 * @cmd contains the posix-translated lock operation to perform
600 * (e.g. F_RDLCK, F_WRLCK).
601 * Return 0 if permission is granted.
602 * @file_fcntl:
603 * Check permission before allowing the file operation specified by @cmd
604 * from being performed on the file @file. Note that @arg can sometimes
605 * represents a user space pointer; in other cases, it may be a simple
606 * integer value. When @arg represents a user space pointer, it should
607 * never be used by the security module.
608 * @file contains the file structure.
609 * @cmd contains the operation to be performed.
610 * @arg contains the operational arguments.
611 * Return 0 if permission is granted.
612 * @file_set_fowner:
613 * Save owner security information (typically from current->security) in
614 * file->f_security for later use by the send_sigiotask hook.
615 * @file contains the file structure to update.
616 * Return 0 on success.
617 * @file_send_sigiotask:
618 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
619 * process @tsk. Note that this hook is sometimes called from interrupt.
620 * Note that the fown_struct, @fown, is never outside the context of a
621 * struct file, so the file structure (and associated security information)
622 * can always be obtained:
623 * container_of(fown, struct file, f_owner)
624 * @tsk contains the structure of task receiving signal.
625 * @fown contains the file owner information.
626 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
627 * Return 0 if permission is granted.
628 * @file_receive:
629 * This hook allows security modules to control the ability of a process
630 * to receive an open file descriptor via socket IPC.
631 * @file contains the file structure being received.
632 * Return 0 if permission is granted.
633 *
634 * Security hook for dentry
635 *
636 * @dentry_open
637 * Save open-time permission checking state for later use upon
638 * file_permission, and recheck access if anything has changed
639 * since inode_permission.
640 *
641 * Security hooks for task operations.
642 *
643 * @task_create:
644 * Check permission before creating a child process. See the clone(2)
645 * manual page for definitions of the @clone_flags.
646 * @clone_flags contains the flags indicating what should be shared.
647 * Return 0 if permission is granted.
648 * @cred_alloc_blank:
649 * @cred points to the credentials.
650 * @gfp indicates the atomicity of any memory allocations.
651 * Only allocate sufficient memory and attach to @cred such that
652 * cred_transfer() will not get ENOMEM.
653 * @cred_free:
654 * @cred points to the credentials.
655 * Deallocate and clear the cred->security field in a set of credentials.
656 * @cred_prepare:
657 * @new points to the new credentials.
658 * @old points to the original credentials.
659 * @gfp indicates the atomicity of any memory allocations.
660 * Prepare a new set of credentials by copying the data from the old set.
661 * @cred_transfer:
662 * @new points to the new credentials.
663 * @old points to the original credentials.
664 * Transfer data from original creds to new creds
665 * @kernel_act_as:
666 * Set the credentials for a kernel service to act as (subjective context).
667 * @new points to the credentials to be modified.
668 * @secid specifies the security ID to be set
669 * The current task must be the one that nominated @secid.
670 * Return 0 if successful.
671 * @kernel_create_files_as:
672 * Set the file creation context in a set of credentials to be the same as
673 * the objective context of the specified inode.
674 * @new points to the credentials to be modified.
675 * @inode points to the inode to use as a reference.
676 * The current task must be the one that nominated @inode.
677 * Return 0 if successful.
678 * @kernel_module_request:
679 * Ability to trigger the kernel to automatically upcall to userspace for
680 * userspace to load a kernel module with the given name.
681 * @kmod_name name of the module requested by the kernel
682 * Return 0 if successful.
683 * @task_fix_setuid:
684 * Update the module's state after setting one or more of the user
685 * identity attributes of the current process. The @flags parameter
686 * indicates which of the set*uid system calls invoked this hook. If
687 * @new is the set of credentials that will be installed. Modifications
688 * should be made to this rather than to @current->cred.
689 * @old is the set of credentials that are being replaces
690 * @flags contains one of the LSM_SETID_* values.
691 * Return 0 on success.
692 * @task_setpgid:
693 * Check permission before setting the process group identifier of the
694 * process @p to @pgid.
695 * @p contains the task_struct for process being modified.
696 * @pgid contains the new pgid.
697 * Return 0 if permission is granted.
698 * @task_getpgid:
699 * Check permission before getting the process group identifier of the
700 * process @p.
701 * @p contains the task_struct for the process.
702 * Return 0 if permission is granted.
703 * @task_getsid:
704 * Check permission before getting the session identifier of the process
705 * @p.
706 * @p contains the task_struct for the process.
707 * Return 0 if permission is granted.
708 * @task_getsecid:
709 * Retrieve the security identifier of the process @p.
710 * @p contains the task_struct for the process and place is into @secid.
711 * In case of failure, @secid will be set to zero.
712 *
713 * @task_setnice:
714 * Check permission before setting the nice value of @p to @nice.
715 * @p contains the task_struct of process.
716 * @nice contains the new nice value.
717 * Return 0 if permission is granted.
718 * @task_setioprio
719 * Check permission before setting the ioprio value of @p to @ioprio.
720 * @p contains the task_struct of process.
721 * @ioprio contains the new ioprio value
722 * Return 0 if permission is granted.
723 * @task_getioprio
724 * Check permission before getting the ioprio value of @p.
725 * @p contains the task_struct of process.
726 * Return 0 if permission is granted.
727 * @task_setrlimit:
728 * Check permission before setting the resource limits of the current
729 * process for @resource to @new_rlim. The old resource limit values can
730 * be examined by dereferencing (current->signal->rlim + resource).
731 * @resource contains the resource whose limit is being set.
732 * @new_rlim contains the new limits for @resource.
733 * Return 0 if permission is granted.
734 * @task_setscheduler:
735 * Check permission before setting scheduling policy and/or parameters of
736 * process @p based on @policy and @lp.
737 * @p contains the task_struct for process.
738 * @policy contains the scheduling policy.
739 * @lp contains the scheduling parameters.
740 * Return 0 if permission is granted.
741 * @task_getscheduler:
742 * Check permission before obtaining scheduling information for process
743 * @p.
744 * @p contains the task_struct for process.
745 * Return 0 if permission is granted.
746 * @task_movememory
747 * Check permission before moving memory owned by process @p.
748 * @p contains the task_struct for process.
749 * Return 0 if permission is granted.
750 * @task_kill:
751 * Check permission before sending signal @sig to @p. @info can be NULL,
752 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
753 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
754 * from the kernel and should typically be permitted.
755 * SIGIO signals are handled separately by the send_sigiotask hook in
756 * file_security_ops.
757 * @p contains the task_struct for process.
758 * @info contains the signal information.
759 * @sig contains the signal value.
760 * @secid contains the sid of the process where the signal originated
761 * Return 0 if permission is granted.
762 * @task_wait:
763 * Check permission before allowing a process to reap a child process @p
764 * and collect its status information.
765 * @p contains the task_struct for process.
766 * Return 0 if permission is granted.
767 * @task_prctl:
768 * Check permission before performing a process control operation on the
769 * current process.
770 * @option contains the operation.
771 * @arg2 contains a argument.
772 * @arg3 contains a argument.
773 * @arg4 contains a argument.
774 * @arg5 contains a argument.
775 * Return -ENOSYS if no-one wanted to handle this op, any other value to
776 * cause prctl() to return immediately with that value.
777 * @task_to_inode:
778 * Set the security attributes for an inode based on an associated task's
779 * security attributes, e.g. for /proc/pid inodes.
780 * @p contains the task_struct for the task.
781 * @inode contains the inode structure for the inode.
782 *
783 * Security hooks for Netlink messaging.
784 *
785 * @netlink_send:
786 * Save security information for a netlink message so that permission
787 * checking can be performed when the message is processed. The security
788 * information can be saved using the eff_cap field of the
789 * netlink_skb_parms structure. Also may be used to provide fine
790 * grained control over message transmission.
791 * @sk associated sock of task sending the message.,
792 * @skb contains the sk_buff structure for the netlink message.
793 * Return 0 if the information was successfully saved and message
794 * is allowed to be transmitted.
795 * @netlink_recv:
796 * Check permission before processing the received netlink message in
797 * @skb.
798 * @skb contains the sk_buff structure for the netlink message.
799 * @cap indicates the capability required
800 * Return 0 if permission is granted.
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 * @tsk contains the task_struct for the process.
1265 * @cred contains the credentials to use.
1266 * @ns contains the user namespace we want the capability in
1267 * @cap contains the capability <include/linux/capability.h>.
1268 * @audit: Whether to write an audit message or not
1269 * Return 0 if the capability is granted for @tsk.
1270 * @syslog:
1271 * Check permission before accessing the kernel message ring or changing
1272 * logging to the console.
1273 * See the syslog(2) manual page for an explanation of the @type values.
1274 * @type contains the type of action.
1275 * @from_file indicates the context of action (if it came from /proc).
1276 * Return 0 if permission is granted.
1277 * @settime:
1278 * Check permission to change the system time.
1279 * struct timespec and timezone are defined in include/linux/time.h
1280 * @ts contains new time
1281 * @tz contains new timezone
1282 * Return 0 if permission is granted.
1283 * @vm_enough_memory:
1284 * Check permissions for allocating a new virtual mapping.
1285 * @mm contains the mm struct it is being added to.
1286 * @pages contains the number of pages.
1287 * Return 0 if permission is granted.
1288 *
1289 * @secid_to_secctx:
1290 * Convert secid to security context. If secdata is NULL the length of
1291 * the result will be returned in seclen, but no secdata will be returned.
1292 * This does mean that the length could change between calls to check the
1293 * length and the next call which actually allocates and returns the secdata.
1294 * @secid contains the security ID.
1295 * @secdata contains the pointer that stores the converted security context.
1296 * @seclen pointer which contains the length of the data
1297 * @secctx_to_secid:
1298 * Convert security context to secid.
1299 * @secid contains the pointer to the generated security ID.
1300 * @secdata contains the security context.
1301 *
1302 * @release_secctx:
1303 * Release the security context.
1304 * @secdata contains the security context.
1305 * @seclen contains the length of the security context.
1306 *
1307 * Security hooks for Audit
1308 *
1309 * @audit_rule_init:
1310 * Allocate and initialize an LSM audit rule structure.
1311 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1312 * @op contains the operator the rule uses.
1313 * @rulestr contains the context where the rule will be applied to.
1314 * @lsmrule contains a pointer to receive the result.
1315 * Return 0 if @lsmrule has been successfully set,
1316 * -EINVAL in case of an invalid rule.
1317 *
1318 * @audit_rule_known:
1319 * Specifies whether given @rule contains any fields related to current LSM.
1320 * @rule contains the audit rule of interest.
1321 * Return 1 in case of relation found, 0 otherwise.
1322 *
1323 * @audit_rule_match:
1324 * Determine if given @secid matches a rule previously approved
1325 * by @audit_rule_known.
1326 * @secid contains the security id in question.
1327 * @field contains the field which relates to current LSM.
1328 * @op contains the operator that will be used for matching.
1329 * @rule points to the audit rule that will be checked against.
1330 * @actx points to the audit context associated with the check.
1331 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1332 *
1333 * @audit_rule_free:
1334 * Deallocate the LSM audit rule structure previously allocated by
1335 * audit_rule_init.
1336 * @rule contains the allocated rule
1337 *
1338 * @inode_notifysecctx:
1339 * Notify the security module of what the security context of an inode
1340 * should be. Initializes the incore security context managed by the
1341 * security module for this inode. Example usage: NFS client invokes
1342 * this hook to initialize the security context in its incore inode to the
1343 * value provided by the server for the file when the server returned the
1344 * file's attributes to the client.
1345 *
1346 * Must be called with inode->i_mutex locked.
1347 *
1348 * @inode we wish to set the security context of.
1349 * @ctx contains the string which we wish to set in the inode.
1350 * @ctxlen contains the length of @ctx.
1351 *
1352 * @inode_setsecctx:
1353 * Change the security context of an inode. Updates the
1354 * incore security context managed by the security module and invokes the
1355 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1356 * xattrs that represent the context. Example usage: NFS server invokes
1357 * this hook to change the security context in its incore inode and on the
1358 * backing filesystem to a value provided by the client on a SETATTR
1359 * operation.
1360 *
1361 * Must be called with inode->i_mutex locked.
1362 *
1363 * @dentry contains the inode we wish to set the security context of.
1364 * @ctx contains the string which we wish to set in the inode.
1365 * @ctxlen contains the length of @ctx.
1366 *
1367 * @inode_getsecctx:
1368 * Returns a string containing all relavent security context information
1369 *
1370 * @inode we wish to set the security context of.
1371 * @ctx is a pointer in which to place the allocated security context.
1372 * @ctxlen points to the place to put the length of @ctx.
1373 * This is the main security structure.
1374 */
1420 #ifdef CONFIG_SECURITY_PATH
1434 mode_t mode);
1437 #endif
1471 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1472 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1501 gfp_t gfp);
1574 #ifdef CONFIG_SECURITY_NETWORK
1597 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1617 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1620 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1625 u32 secid);
1635 /* key management security hooks */
1636 #ifdef CONFIG_KEYS
1641 key_perm_t perm);
1645 #ifdef CONFIG_AUDIT
1652 };
1654 /* prototypes */
1659 /* Security operations */
1735 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1736 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1820 };
1823 {
1824 }
1827 {
1828 }
1830 /*
1831 * This is the default capabilities functionality. Most of these functions
1832 * are just stubbed out, but a few must call the proper capable code.
1833 */
1836 {
1838 }
1842 {
1844 }
1847 {
1849 }
1855 {
1857 }
1864 {
1866 }
1870 {
1872 }
1874 static inline int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int cap)
1875 {
1882 }
1886 {
1891 SECURITY_CAP_NOAUDIT);
1894 }
1898 {
1900 }
1903 {
1905 }
1908 {
1910 }
1914 {
1916 }
1919 {
1922 }
1925 {
1928 }
1931 {
1932 /* If current->mm is a kernel thread then we will pass NULL,
1933 for this specific case that is fine */
1935 }
1938 {
1940 }
1943 {
1945 }
1948 {
1949 }
1952 {
1953 }
1956 {
1958 }
1961 {
1963 }
1966 { }
1969 {
1971 }
1974 {
1976 }
1979 {
1981 }
1985 {
1987 }
1990 {
1992 }
1997 {
1999 }
2002 {
2004 }
2008 {
2010 }
2014 {
2016 }
2020 { }
2023 {
2025 }
2028 {
2030 }
2033 { }
2041 {
2043 }
2048 {
2050 }
2055 {
2057 }
2061 {
2063 }
2068 {
2070 }
2075 {
2077 }
2081 {
2083 }
2088 {
2090 }
2096 {
2098 }
2101 {
2103 }
2107 {
2109 }
2112 {
2114 }
2118 {
2120 }
2124 {
2126 }
2130 {
2132 }
2136 {
2138 }
2142 { }
2146 {
2148 }
2151 {
2153 }
2157 {
2159 }
2162 {
2164 }
2167 {
2169 }
2171 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2172 {
2174 }
2176 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2177 {
2179 }
2181 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2182 {
2184 }
2187 {
2189 }
2192 {
2194 }
2197 {
2199 }
2202 { }
2206 {
2208 }
2215 {
2217 }
2222 {
2224 }
2227 {
2229 }
2233 {
2235 }
2238 {
2240 }
2245 {
2247 }
2250 {
2252 }
2256 {
2258 }
2261 {
2263 }
2266 {
2268 }
2271 { }
2275 gfp_t gfp)
2276 {
2278 }
2282 {
2283 }
2286 {
2288 }
2292 {
2294 }
2297 {
2299 }
2304 {
2306 }
2309 {
2311 }
2314 {
2316 }
2319 {
2321 }
2324 {
2326 }
2329 {
2331 }
2334 {
2336 }
2339 {
2341 }
2346 {
2348 }
2351 {
2353 }
2356 {
2358 }
2361 {
2363 }
2367 u32 secid)
2368 {
2370 }
2373 {
2375 }
2381 {
2383 }
2386 { }
2390 {
2392 }
2395 {
2397 }
2400 {
2402 }
2405 { }
2408 {
2410 }
2413 { }
2417 {
2419 }
2422 {
2424 }
2428 {
2430 }
2436 {
2438 }
2441 {
2443 }
2446 { }
2450 {
2452 }
2455 {
2457 }
2461 {
2463 }
2466 {
2468 }
2471 { }
2474 {
2476 }
2479 {
2481 }
2486 {
2488 }
2491 { }
2494 {
2496 }
2498 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2499 {
2501 }
2504 {
2506 }
2509 {
2511 }
2514 {
2516 }
2519 u32 seclen,
2521 {
2523 }
2526 {
2527 }
2530 {
2532 }
2534 {
2536 }
2538 {
2540 }
2543 #ifdef CONFIG_SECURITY_NETWORK
2589 {
2591 }
2595 {
2597 }
2601 {
2603 }
2609 {
2611 }
2616 {
2618 }
2623 {
2625 }
2628 {
2630 }
2634 {
2636 }
2640 {
2642 }
2647 {
2649 }
2652 {
2654 }
2657 {
2659 }
2663 {
2665 }
2669 {
2671 }
2674 {
2676 }
2679 {
2681 }
2685 {
2687 }
2689 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2690 {
2692 }
2695 {
2697 }
2700 {
2701 }
2704 {
2705 }
2708 {
2709 }
2711 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2712 {
2713 }
2716 {
2717 }
2721 {
2723 }
2727 {
2728 }
2732 {
2733 }
2736 {
2738 }
2741 {
2742 }
2745 {
2746 }
2749 {
2751 }
2754 {
2755 }
2758 {
2760 }
2763 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2783 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2784 {
2786 }
2788 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2789 {
2791 }
2794 {
2795 }
2798 {
2800 }
2804 {
2806 }
2810 {
2812 }
2815 {
2816 }
2819 {
2821 }
2824 {
2826 }
2830 {
2832 }
2835 {
2837 }
2840 {
2841 }
2845 #ifdef CONFIG_SECURITY_PATH
2859 mode_t mode);
2864 {
2866 }
2870 {
2872 }
2875 {
2877 }
2881 {
2883 }
2886 {
2888 }
2892 {
2894 }
2899 {
2901 }
2907 {
2909 }
2913 mode_t mode)
2914 {
2916 }
2919 {
2921 }
2924 {
2926 }
2929 #ifdef CONFIG_KEYS
2930 #ifdef CONFIG_SECURITY
2938 #else
2943 {
2945 }
2948 {
2949 }
2953 key_perm_t perm)
2954 {
2956 }
2959 {
2962 }
2964 #endif
2967 #ifdef CONFIG_AUDIT
2968 #ifdef CONFIG_SECURITY
2975 #else
2979 {
2981 }
2984 {
2986 }
2990 {
2992 }
2995 { }
3000 #ifdef CONFIG_SECURITYFS
3012 {
3014 }
3017 mode_t mode,
3021 {
3023 }
3026 {}
3028 #endif
3030 #ifdef CONFIG_SECURITY
3033 {
3035 }
3038 {
3040 }
3042 #else
3045 {
3047 }
3050 { }