| blob | 1f16eea2017b1062caf0be4540c4e0cb19a2bb27 |
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/binfmts.h>
27 #include <linux/signal.h>
28 #include <linux/resource.h>
29 #include <linux/sem.h>
30 #include <linux/shm.h>
32 #include <linux/msg.h>
33 #include <linux/sched.h>
34 #include <linux/key.h>
35 #include <linux/xfrm.h>
36 #include <linux/gfp.h>
37 #include <net/flow.h>
39 /* Maximum number of letters for an LSM name string */
40 #define SECURITY_NAME_MAX 10
42 /* If capable should audit the security request */
43 #define SECURITY_CAP_NOAUDIT 0
44 #define SECURITY_CAP_AUDIT 1
49 /*
50 * These functions are in security/capability.c and are used
51 * as the default capabilities functions
52 */
58 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
100 /*
101 * Values used in the task_security_ops calls
102 */
103 /* setuid or setgid, id0 == uid or gid */
104 #define LSM_SETID_ID 1
106 /* setreuid or setregid, id0 == real, id1 == eff */
107 #define LSM_SETID_RE 2
109 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
110 #define LSM_SETID_RES 4
112 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
113 #define LSM_SETID_FS 8
115 /* forward declares to avoid warnings */
119 /* bprm->unsafe reasons */
120 #define LSM_UNSAFE_SHARE 1
121 #define LSM_UNSAFE_PTRACE 2
122 #define LSM_UNSAFE_PTRACE_CAP 4
124 /*
125 * If a hint addr is less than mmap_min_addr change hint to be as
126 * low as possible but still greater than mmap_min_addr
127 */
129 {
135 }
139 #ifdef CONFIG_SECURITY
145 };
148 {
152 }
155 {
165 }
167 /**
168 * struct security_operations - main security structure
169 *
170 * Security module identifier.
171 *
172 * @name:
173 * A string that acts as a unique identifeir for the LSM with max number
174 * of characters = SECURITY_NAME_MAX.
175 *
176 * Security hooks for program execution operations.
177 *
178 * @bprm_set_creds:
179 * Save security information in the bprm->security field, typically based
180 * on information about the bprm->file, for later use by the apply_creds
181 * hook. This hook may also optionally check permissions (e.g. for
182 * transitions between security domains).
183 * This hook may be called multiple times during a single execve, e.g. for
184 * interpreters. The hook can tell whether it has already been called by
185 * checking to see if @bprm->security is non-NULL. If so, then the hook
186 * may decide either to retain the security information saved earlier or
187 * to replace it.
188 * @bprm contains the linux_binprm structure.
189 * Return 0 if the hook is successful and permission is granted.
190 * @bprm_check_security:
191 * This hook mediates the point when a search for a binary handler will
192 * begin. It allows a check the @bprm->security value which is set in the
193 * preceding set_creds call. The primary difference from set_creds is
194 * that the argv list and envp list are reliably available in @bprm. This
195 * hook may be called multiple times during a single execve; and in each
196 * pass set_creds is called first.
197 * @bprm contains the linux_binprm structure.
198 * Return 0 if the hook is successful and permission is granted.
199 * @bprm_committing_creds:
200 * Prepare to install the new security attributes of a process being
201 * transformed by an execve operation, based on the old credentials
202 * pointed to by @current->cred and the information set in @bprm->cred by
203 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
204 * This hook is a good place to perform state changes on the process such
205 * as closing open file descriptors to which access will no longer be
206 * granted when the attributes are changed. This is called immediately
207 * before commit_creds().
208 * @bprm_committed_creds:
209 * Tidy up after the installation of the new security attributes of a
210 * process being transformed by an execve operation. The new credentials
211 * have, by this point, been set to @current->cred. @bprm points to the
212 * linux_binprm structure. This hook is a good place to perform state
213 * changes on the process such as clearing out non-inheritable signal
214 * state. This is called immediately after commit_creds().
215 * @bprm_secureexec:
216 * Return a boolean value (0 or 1) indicating whether a "secure exec"
217 * is required. The flag is passed in the auxiliary table
218 * on the initial stack to the ELF interpreter to indicate whether libc
219 * should enable secure mode.
220 * @bprm contains the linux_binprm structure.
221 *
222 * Security hooks for filesystem operations.
223 *
224 * @sb_alloc_security:
225 * Allocate and attach a security structure to the sb->s_security field.
226 * The s_security field is initialized to NULL when the structure is
227 * allocated.
228 * @sb contains the super_block structure to be modified.
229 * Return 0 if operation was successful.
230 * @sb_free_security:
231 * Deallocate and clear the sb->s_security field.
232 * @sb contains the super_block structure to be modified.
233 * @sb_statfs:
234 * Check permission before obtaining filesystem statistics for the @mnt
235 * mountpoint.
236 * @dentry is a handle on the superblock for the filesystem.
237 * Return 0 if permission is granted.
238 * @sb_mount:
239 * Check permission before an object specified by @dev_name is mounted on
240 * the mount point named by @nd. For an ordinary mount, @dev_name
241 * identifies a device if the file system type requires a device. For a
242 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
243 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
244 * pathname of the object being mounted.
245 * @dev_name contains the name for object being mounted.
246 * @path contains the path for mount point object.
247 * @type contains the filesystem type.
248 * @flags contains the mount flags.
249 * @data contains the filesystem-specific data.
250 * Return 0 if permission is granted.
251 * @sb_copy_data:
252 * Allow mount option data to be copied prior to parsing by the filesystem,
253 * so that the security module can extract security-specific mount
254 * options cleanly (a filesystem may modify the data e.g. with strsep()).
255 * This also allows the original mount data to be stripped of security-
256 * specific options to avoid having to make filesystems aware of them.
257 * @type the type of filesystem being mounted.
258 * @orig the original mount data copied from userspace.
259 * @copy copied data which will be passed to the security module.
260 * Returns 0 if the copy was successful.
261 * @sb_check_sb:
262 * Check permission before the device with superblock @mnt->sb is mounted
263 * on the mount point named by @nd.
264 * @mnt contains the vfsmount for device being mounted.
265 * @path contains the path for the mount point.
266 * Return 0 if permission is granted.
267 * @sb_umount:
268 * Check permission before the @mnt file system is unmounted.
269 * @mnt contains the mounted file system.
270 * @flags contains the unmount flags, e.g. MNT_FORCE.
271 * Return 0 if permission is granted.
272 * @sb_umount_close:
273 * Close any files in the @mnt mounted filesystem that are held open by
274 * the security module. This hook is called during an umount operation
275 * prior to checking whether the filesystem is still busy.
276 * @mnt contains the mounted filesystem.
277 * @sb_umount_busy:
278 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
279 * any files that were closed by umount_close. This hook is called during
280 * an umount operation if the umount fails after a call to the
281 * umount_close hook.
282 * @mnt contains the mounted filesystem.
283 * @sb_post_remount:
284 * Update the security module's state when a filesystem is remounted.
285 * This hook is only called if the remount was successful.
286 * @mnt contains the mounted file system.
287 * @flags contains the new filesystem flags.
288 * @data contains the filesystem-specific data.
289 * @sb_post_addmount:
290 * Update the security module's state when a filesystem is mounted.
291 * This hook is called any time a mount is successfully grafetd to
292 * the tree.
293 * @mnt contains the mounted filesystem.
294 * @mountpoint contains the path for the mount point.
295 * @sb_pivotroot:
296 * Check permission before pivoting the root filesystem.
297 * @old_path contains the path for the new location of the current root (put_old).
298 * @new_path contains the path for the new root (new_root).
299 * Return 0 if permission is granted.
300 * @sb_post_pivotroot:
301 * Update module state after a successful pivot.
302 * @old_path contains the path for the old root.
303 * @new_path contains the path for the new root.
304 * @sb_set_mnt_opts:
305 * Set the security relevant mount options used for a superblock
306 * @sb the superblock to set security mount options for
307 * @opts binary data structure containing all lsm mount data
308 * @sb_clone_mnt_opts:
309 * Copy all security options from a given superblock to another
310 * @oldsb old superblock which contain information to clone
311 * @newsb new superblock which needs filled in
312 * @sb_parse_opts_str:
313 * Parse a string of security data filling in the opts structure
314 * @options string containing all mount options known by the LSM
315 * @opts binary data structure usable by the LSM
316 *
317 * Security hooks for inode operations.
318 *
319 * @inode_alloc_security:
320 * Allocate and attach a security structure to @inode->i_security. The
321 * i_security field is initialized to NULL when the inode structure is
322 * allocated.
323 * @inode contains the inode structure.
324 * Return 0 if operation was successful.
325 * @inode_free_security:
326 * @inode contains the inode structure.
327 * Deallocate the inode security structure and set @inode->i_security to
328 * NULL.
329 * @inode_init_security:
330 * Obtain the security attribute name suffix and value to set on a newly
331 * created inode and set up the incore security field for the new inode.
332 * This hook is called by the fs code as part of the inode creation
333 * transaction and provides for atomic labeling of the inode, unlike
334 * the post_create/mkdir/... hooks called by the VFS. The hook function
335 * is expected to allocate the name and value via kmalloc, with the caller
336 * being responsible for calling kfree after using them.
337 * If the security module does not use security attributes or does
338 * not wish to put a security attribute on this particular inode,
339 * then it should return -EOPNOTSUPP to skip this processing.
340 * @inode contains the inode structure of the newly created inode.
341 * @dir contains the inode structure of the parent directory.
342 * @name will be set to the allocated name suffix (e.g. selinux).
343 * @value will be set to the allocated attribute value.
344 * @len will be set to the length of the value.
345 * Returns 0 if @name and @value have been successfully set,
346 * -EOPNOTSUPP if no security attribute is needed, or
347 * -ENOMEM on memory allocation failure.
348 * @inode_create:
349 * Check permission to create a regular file.
350 * @dir contains inode structure of the parent of the new file.
351 * @dentry contains the dentry structure for the file to be created.
352 * @mode contains the file mode of the file to be created.
353 * Return 0 if permission is granted.
354 * @inode_link:
355 * Check permission before creating a new hard link to a file.
356 * @old_dentry contains the dentry structure for an existing link to the file.
357 * @dir contains the inode structure of the parent directory of the new link.
358 * @new_dentry contains the dentry structure for the new link.
359 * Return 0 if permission is granted.
360 * @path_link:
361 * Check permission before creating a new hard link to a file.
362 * @old_dentry contains the dentry structure for an existing link
363 * to the file.
364 * @new_dir contains the path structure of the parent directory of
365 * the new link.
366 * @new_dentry contains the dentry structure for the new link.
367 * Return 0 if permission is granted.
368 * @inode_unlink:
369 * Check the permission to remove a hard link to a file.
370 * @dir contains the inode structure of parent directory of the file.
371 * @dentry contains the dentry structure for file to be unlinked.
372 * Return 0 if permission is granted.
373 * @path_unlink:
374 * Check the permission to remove a hard link to a file.
375 * @dir contains the path structure of parent directory of the file.
376 * @dentry contains the dentry structure for file to be unlinked.
377 * Return 0 if permission is granted.
378 * @inode_symlink:
379 * Check the permission to create a symbolic link to a file.
380 * @dir contains the inode structure of parent directory of 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 * @path_symlink:
385 * Check the permission to create a symbolic link to a file.
386 * @dir contains the path structure of parent directory of
387 * the symbolic link.
388 * @dentry contains the dentry structure of the symbolic link.
389 * @old_name contains the pathname of file.
390 * Return 0 if permission is granted.
391 * @inode_mkdir:
392 * Check permissions to create a new directory in the existing directory
393 * associated with inode strcture @dir.
394 * @dir containst the inode structure of parent of the directory to be created.
395 * @dentry contains the dentry structure of new directory.
396 * @mode contains the mode of new directory.
397 * Return 0 if permission is granted.
398 * @path_mkdir:
399 * Check permissions to create a new directory in the existing directory
400 * associated with path strcture @path.
401 * @dir containst the path structure of parent of the directory
402 * to be created.
403 * @dentry contains the dentry structure of new directory.
404 * @mode contains the mode of new directory.
405 * Return 0 if permission is granted.
406 * @inode_rmdir:
407 * Check the permission to remove a directory.
408 * @dir contains the inode structure of parent of the directory to be removed.
409 * @dentry contains the dentry structure of directory to be removed.
410 * Return 0 if permission is granted.
411 * @path_rmdir:
412 * Check the permission to remove a directory.
413 * @dir contains the path structure of parent of the directory to be
414 * removed.
415 * @dentry contains the dentry structure of directory to be removed.
416 * Return 0 if permission is granted.
417 * @inode_mknod:
418 * Check permissions when creating a special file (or a socket or a fifo
419 * file created via the mknod system call). Note that if mknod operation
420 * is being done for a regular file, then the create hook will be called
421 * and not this hook.
422 * @dir contains the inode structure of parent of the new file.
423 * @dentry contains the dentry structure of the new file.
424 * @mode contains the mode of the new file.
425 * @dev contains the device number.
426 * Return 0 if permission is granted.
427 * @path_mknod:
428 * Check permissions when creating a file. Note that this hook is called
429 * even if mknod operation is being done for a regular file.
430 * @dir contains the path structure of parent of the new file.
431 * @dentry contains the dentry structure of the new file.
432 * @mode contains the mode of the new file.
433 * @dev contains the undecoded device number. Use new_decode_dev() to get
434 * the decoded device number.
435 * Return 0 if permission is granted.
436 * @inode_rename:
437 * Check for permission to rename a file or directory.
438 * @old_dir contains the inode structure for parent of the old link.
439 * @old_dentry contains the dentry structure of the old link.
440 * @new_dir contains the inode 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_rename:
444 * Check for permission to rename a file or directory.
445 * @old_dir contains the path structure for parent of the old link.
446 * @old_dentry contains the dentry structure of the old link.
447 * @new_dir contains the path structure for parent of the new link.
448 * @new_dentry contains the dentry structure of the new link.
449 * Return 0 if permission is granted.
450 * @inode_readlink:
451 * Check the permission to read the symbolic link.
452 * @dentry contains the dentry structure for the file link.
453 * Return 0 if permission is granted.
454 * @inode_follow_link:
455 * Check permission to follow a symbolic link when looking up a pathname.
456 * @dentry contains the dentry structure for the link.
457 * @nd contains the nameidata structure for the parent directory.
458 * Return 0 if permission is granted.
459 * @inode_permission:
460 * Check permission before accessing an inode. This hook is called by the
461 * existing Linux permission function, so a security module can use it to
462 * provide additional checking for existing Linux permission checks.
463 * Notice that this hook is called when a file is opened (as well as many
464 * other operations), whereas the file_security_ops permission hook is
465 * called when the actual read/write operations are performed.
466 * @inode contains the inode structure to check.
467 * @mask contains the permission mask.
468 * @nd contains the nameidata (may be NULL).
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 * @length is the new length of the file.
482 * @time_attrs is the flags passed to do_truncate().
483 * Return 0 if permission is granted.
484 * @inode_getattr:
485 * Check permission before obtaining file attributes.
486 * @mnt is the vfsmount where the dentry was looked up
487 * @dentry contains the dentry structure for the file.
488 * Return 0 if permission is granted.
489 * @inode_delete:
490 * @inode contains the inode structure for deleted inode.
491 * This hook is called when a deleted inode is released (i.e. an inode
492 * with no hard links has its use count drop to zero). A security module
493 * can use this hook to release any persistent label associated with the
494 * inode.
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 can
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 * Return 0 if permission is granted.
597 * @file_mprotect:
598 * Check permissions before changing memory access permissions.
599 * @vma contains the memory region to modify.
600 * @reqprot contains the protection requested by the application.
601 * @prot contains the protection that will be applied by the kernel.
602 * Return 0 if permission is granted.
603 * @file_lock:
604 * Check permission before performing file locking operations.
605 * Note: this hook mediates both flock and fcntl style locks.
606 * @file contains the file structure.
607 * @cmd contains the posix-translated lock operation to perform
608 * (e.g. F_RDLCK, F_WRLCK).
609 * Return 0 if permission is granted.
610 * @file_fcntl:
611 * Check permission before allowing the file operation specified by @cmd
612 * from being performed on the file @file. Note that @arg can sometimes
613 * represents a user space pointer; in other cases, it may be a simple
614 * integer value. When @arg represents a user space pointer, it should
615 * never be used by the security module.
616 * @file contains the file structure.
617 * @cmd contains the operation to be performed.
618 * @arg contains the operational arguments.
619 * Return 0 if permission is granted.
620 * @file_set_fowner:
621 * Save owner security information (typically from current->security) in
622 * file->f_security for later use by the send_sigiotask hook.
623 * @file contains the file structure to update.
624 * Return 0 on success.
625 * @file_send_sigiotask:
626 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
627 * process @tsk. Note that this hook is sometimes called from interrupt.
628 * Note that the fown_struct, @fown, is never outside the context of a
629 * struct file, so the file structure (and associated security information)
630 * can always be obtained:
631 * container_of(fown, struct file, f_owner)
632 * @tsk contains the structure of task receiving signal.
633 * @fown contains the file owner information.
634 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
635 * Return 0 if permission is granted.
636 * @file_receive:
637 * This hook allows security modules to control the ability of a process
638 * to receive an open file descriptor via socket IPC.
639 * @file contains the file structure being received.
640 * Return 0 if permission is granted.
641 *
642 * Security hook for dentry
643 *
644 * @dentry_open
645 * Save open-time permission checking state for later use upon
646 * file_permission, and recheck access if anything has changed
647 * since inode_permission.
648 *
649 * Security hooks for task operations.
650 *
651 * @task_create:
652 * Check permission before creating a child process. See the clone(2)
653 * manual page for definitions of the @clone_flags.
654 * @clone_flags contains the flags indicating what should be shared.
655 * Return 0 if permission is granted.
656 * @cred_free:
657 * @cred points to the credentials.
658 * Deallocate and clear the cred->security field in a set of credentials.
659 * @cred_prepare:
660 * @new points to the new credentials.
661 * @old points to the original credentials.
662 * @gfp indicates the atomicity of any memory allocations.
663 * Prepare a new set of credentials by copying the data from the old set.
664 * @cred_commit:
665 * @new points to the new credentials.
666 * @old points to the original credentials.
667 * Install a new set of credentials.
668 * @kernel_act_as:
669 * Set the credentials for a kernel service to act as (subjective context).
670 * @new points to the credentials to be modified.
671 * @secid specifies the security ID to be set
672 * The current task must be the one that nominated @secid.
673 * Return 0 if successful.
674 * @kernel_create_files_as:
675 * Set the file creation context in a set of credentials to be the same as
676 * the objective context of the specified inode.
677 * @new points to the credentials to be modified.
678 * @inode points to the inode to use as a reference.
679 * The current task must be the one that nominated @inode.
680 * Return 0 if successful.
681 * @task_setuid:
682 * Check permission before setting one or more of the user identity
683 * attributes of the current process. The @flags parameter indicates
684 * which of the set*uid system calls invoked this hook and how to
685 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
686 * definitions at the beginning of this file for the @flags values and
687 * their meanings.
688 * @id0 contains a uid.
689 * @id1 contains a uid.
690 * @id2 contains a uid.
691 * @flags contains one of the LSM_SETID_* values.
692 * Return 0 if permission is granted.
693 * @task_fix_setuid:
694 * Update the module's state after setting one or more of the user
695 * identity attributes of the current process. The @flags parameter
696 * indicates which of the set*uid system calls invoked this hook. If
697 * @new is the set of credentials that will be installed. Modifications
698 * should be made to this rather than to @current->cred.
699 * @old is the set of credentials that are being replaces
700 * @flags contains one of the LSM_SETID_* values.
701 * Return 0 on success.
702 * @task_setgid:
703 * Check permission before setting one or more of the group identity
704 * attributes of the current process. The @flags parameter indicates
705 * which of the set*gid system calls invoked this hook and how to
706 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
707 * definitions at the beginning of this file for the @flags values and
708 * their meanings.
709 * @id0 contains a gid.
710 * @id1 contains a gid.
711 * @id2 contains a gid.
712 * @flags contains one of the LSM_SETID_* values.
713 * Return 0 if permission is granted.
714 * @task_setpgid:
715 * Check permission before setting the process group identifier of the
716 * process @p to @pgid.
717 * @p contains the task_struct for process being modified.
718 * @pgid contains the new pgid.
719 * Return 0 if permission is granted.
720 * @task_getpgid:
721 * Check permission before getting the process group identifier of the
722 * process @p.
723 * @p contains the task_struct for the process.
724 * Return 0 if permission is granted.
725 * @task_getsid:
726 * Check permission before getting the session identifier of the process
727 * @p.
728 * @p contains the task_struct for the process.
729 * Return 0 if permission is granted.
730 * @task_getsecid:
731 * Retrieve the security identifier of the process @p.
732 * @p contains the task_struct for the process and place is into @secid.
733 * In case of failure, @secid will be set to zero.
734 *
735 * @task_setgroups:
736 * Check permission before setting the supplementary group set of the
737 * current process.
738 * @group_info contains the new group information.
739 * Return 0 if permission is granted.
740 * @task_setnice:
741 * Check permission before setting the nice value of @p to @nice.
742 * @p contains the task_struct of process.
743 * @nice contains the new nice value.
744 * Return 0 if permission is granted.
745 * @task_setioprio
746 * Check permission before setting the ioprio value of @p to @ioprio.
747 * @p contains the task_struct of process.
748 * @ioprio contains the new ioprio value
749 * Return 0 if permission is granted.
750 * @task_getioprio
751 * Check permission before getting the ioprio value of @p.
752 * @p contains the task_struct of process.
753 * Return 0 if permission is granted.
754 * @task_setrlimit:
755 * Check permission before setting the resource limits of the current
756 * process for @resource to @new_rlim. The old resource limit values can
757 * be examined by dereferencing (current->signal->rlim + resource).
758 * @resource contains the resource whose limit is being set.
759 * @new_rlim contains the new limits for @resource.
760 * Return 0 if permission is granted.
761 * @task_setscheduler:
762 * Check permission before setting scheduling policy and/or parameters of
763 * process @p based on @policy and @lp.
764 * @p contains the task_struct for process.
765 * @policy contains the scheduling policy.
766 * @lp contains the scheduling parameters.
767 * Return 0 if permission is granted.
768 * @task_getscheduler:
769 * Check permission before obtaining scheduling information for process
770 * @p.
771 * @p contains the task_struct for process.
772 * Return 0 if permission is granted.
773 * @task_movememory
774 * Check permission before moving memory owned by process @p.
775 * @p contains the task_struct for process.
776 * Return 0 if permission is granted.
777 * @task_kill:
778 * Check permission before sending signal @sig to @p. @info can be NULL,
779 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
780 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
781 * from the kernel and should typically be permitted.
782 * SIGIO signals are handled separately by the send_sigiotask hook in
783 * file_security_ops.
784 * @p contains the task_struct for process.
785 * @info contains the signal information.
786 * @sig contains the signal value.
787 * @secid contains the sid of the process where the signal originated
788 * Return 0 if permission is granted.
789 * @task_wait:
790 * Check permission before allowing a process to reap a child process @p
791 * and collect its status information.
792 * @p contains the task_struct for process.
793 * Return 0 if permission is granted.
794 * @task_prctl:
795 * Check permission before performing a process control operation on the
796 * current process.
797 * @option contains the operation.
798 * @arg2 contains a argument.
799 * @arg3 contains a argument.
800 * @arg4 contains a argument.
801 * @arg5 contains a argument.
802 * Return -ENOSYS if no-one wanted to handle this op, any other value to
803 * cause prctl() to return immediately with that value.
804 * @task_to_inode:
805 * Set the security attributes for an inode based on an associated task's
806 * security attributes, e.g. for /proc/pid inodes.
807 * @p contains the task_struct for the task.
808 * @inode contains the inode structure for the inode.
809 *
810 * Security hooks for Netlink messaging.
811 *
812 * @netlink_send:
813 * Save security information for a netlink message so that permission
814 * checking can be performed when the message is processed. The security
815 * information can be saved using the eff_cap field of the
816 * netlink_skb_parms structure. Also may be used to provide fine
817 * grained control over message transmission.
818 * @sk associated sock of task sending the message.,
819 * @skb contains the sk_buff structure for the netlink message.
820 * Return 0 if the information was successfully saved and message
821 * is allowed to be transmitted.
822 * @netlink_recv:
823 * Check permission before processing the received netlink message in
824 * @skb.
825 * @skb contains the sk_buff structure for the netlink message.
826 * @cap indicates the capability required
827 * Return 0 if permission is granted.
828 *
829 * Security hooks for Unix domain networking.
830 *
831 * @unix_stream_connect:
832 * Check permissions before establishing a Unix domain stream connection
833 * between @sock and @other.
834 * @sock contains the socket structure.
835 * @other contains the peer socket structure.
836 * Return 0 if permission is granted.
837 * @unix_may_send:
838 * Check permissions before connecting or sending datagrams from @sock to
839 * @other.
840 * @sock contains the socket structure.
841 * @sock contains the peer socket structure.
842 * Return 0 if permission is granted.
843 *
844 * The @unix_stream_connect and @unix_may_send hooks were necessary because
845 * Linux provides an alternative to the conventional file name space for Unix
846 * domain sockets. Whereas binding and connecting to sockets in the file name
847 * space is mediated by the typical file permissions (and caught by the mknod
848 * and permission hooks in inode_security_ops), binding and connecting to
849 * sockets in the abstract name space is completely unmediated. Sufficient
850 * control of Unix domain sockets in the abstract name space isn't possible
851 * using only the socket layer hooks, since we need to know the actual target
852 * socket, which is not looked up until we are inside the af_unix code.
853 *
854 * Security hooks for socket operations.
855 *
856 * @socket_create:
857 * Check permissions prior to creating a new socket.
858 * @family contains the requested protocol family.
859 * @type contains the requested communications type.
860 * @protocol contains the requested protocol.
861 * @kern set to 1 if a kernel socket.
862 * Return 0 if permission is granted.
863 * @socket_post_create:
864 * This hook allows a module to update or allocate a per-socket security
865 * structure. Note that the security field was not added directly to the
866 * socket structure, but rather, the socket security information is stored
867 * in the associated inode. Typically, the inode alloc_security hook will
868 * allocate and and attach security information to
869 * sock->inode->i_security. This hook may be used to update the
870 * sock->inode->i_security field with additional information that wasn't
871 * available when the inode was allocated.
872 * @sock contains the newly created socket structure.
873 * @family contains the requested protocol family.
874 * @type contains the requested communications type.
875 * @protocol contains the requested protocol.
876 * @kern set to 1 if a kernel socket.
877 * @socket_bind:
878 * Check permission before socket protocol layer bind operation is
879 * performed and the socket @sock is bound to the address specified in the
880 * @address parameter.
881 * @sock contains the socket structure.
882 * @address contains the address to bind to.
883 * @addrlen contains the length of address.
884 * Return 0 if permission is granted.
885 * @socket_connect:
886 * Check permission before socket protocol layer connect operation
887 * attempts to connect socket @sock to a remote address, @address.
888 * @sock contains the socket structure.
889 * @address contains the address of remote endpoint.
890 * @addrlen contains the length of address.
891 * Return 0 if permission is granted.
892 * @socket_listen:
893 * Check permission before socket protocol layer listen operation.
894 * @sock contains the socket structure.
895 * @backlog contains the maximum length for the pending connection queue.
896 * Return 0 if permission is granted.
897 * @socket_accept:
898 * Check permission before accepting a new connection. Note that the new
899 * socket, @newsock, has been created and some information copied to it,
900 * but the accept operation has not actually been performed.
901 * @sock contains the listening socket structure.
902 * @newsock contains the newly created server socket for connection.
903 * Return 0 if permission is granted.
904 * @socket_sendmsg:
905 * Check permission before transmitting a message to another socket.
906 * @sock contains the socket structure.
907 * @msg contains the message to be transmitted.
908 * @size contains the size of message.
909 * Return 0 if permission is granted.
910 * @socket_recvmsg:
911 * Check permission before receiving a message from a socket.
912 * @sock contains the socket structure.
913 * @msg contains the message structure.
914 * @size contains the size of message structure.
915 * @flags contains the operational flags.
916 * Return 0 if permission is granted.
917 * @socket_getsockname:
918 * Check permission before the local address (name) of the socket object
919 * @sock is retrieved.
920 * @sock contains the socket structure.
921 * Return 0 if permission is granted.
922 * @socket_getpeername:
923 * Check permission before the remote address (name) of a socket object
924 * @sock is retrieved.
925 * @sock contains the socket structure.
926 * Return 0 if permission is granted.
927 * @socket_getsockopt:
928 * Check permissions before retrieving the options associated with socket
929 * @sock.
930 * @sock contains the socket structure.
931 * @level contains the protocol level to retrieve option from.
932 * @optname contains the name of option to retrieve.
933 * Return 0 if permission is granted.
934 * @socket_setsockopt:
935 * Check permissions before setting the options associated with socket
936 * @sock.
937 * @sock contains the socket structure.
938 * @level contains the protocol level to set options for.
939 * @optname contains the name of the option to set.
940 * Return 0 if permission is granted.
941 * @socket_shutdown:
942 * Checks permission before all or part of a connection on the socket
943 * @sock is shut down.
944 * @sock contains the socket structure.
945 * @how contains the flag indicating how future sends and receives are handled.
946 * Return 0 if permission is granted.
947 * @socket_sock_rcv_skb:
948 * Check permissions on incoming network packets. This hook is distinct
949 * from Netfilter's IP input hooks since it is the first time that the
950 * incoming sk_buff @skb has been associated with a particular socket, @sk.
951 * @sk contains the sock (not socket) associated with the incoming sk_buff.
952 * @skb contains the incoming network data.
953 * @socket_getpeersec_stream:
954 * This hook allows the security module to provide peer socket security
955 * state for unix or connected tcp sockets to userspace via getsockopt
956 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
957 * socket is associated with an ipsec SA.
958 * @sock is the local socket.
959 * @optval userspace memory where the security state is to be copied.
960 * @optlen userspace int where the module should copy the actual length
961 * of the security state.
962 * @len as input is the maximum length to copy to userspace provided
963 * by the caller.
964 * Return 0 if all is well, otherwise, typical getsockopt return
965 * values.
966 * @socket_getpeersec_dgram:
967 * This hook allows the security module to provide peer socket security
968 * state for udp sockets on a per-packet basis to userspace via
969 * getsockopt SO_GETPEERSEC. The application must first have indicated
970 * the IP_PASSSEC option via getsockopt. It can then retrieve the
971 * security state returned by this hook for a packet via the SCM_SECURITY
972 * ancillary message type.
973 * @skb is the skbuff for the packet being queried
974 * @secdata is a pointer to a buffer in which to copy the security data
975 * @seclen is the maximum length for @secdata
976 * Return 0 on success, error on failure.
977 * @sk_alloc_security:
978 * Allocate and attach a security structure to the sk->sk_security field,
979 * which is used to copy security attributes between local stream sockets.
980 * @sk_free_security:
981 * Deallocate security structure.
982 * @sk_clone_security:
983 * Clone/copy security structure.
984 * @sk_getsecid:
985 * Retrieve the LSM-specific secid for the sock to enable caching of network
986 * authorizations.
987 * @sock_graft:
988 * Sets the socket's isec sid to the sock's sid.
989 * @inet_conn_request:
990 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
991 * @inet_csk_clone:
992 * Sets the new child socket's sid to the openreq sid.
993 * @inet_conn_established:
994 * Sets the connection's peersid to the secmark on skb.
995 * @req_classify_flow:
996 * Sets the flow's sid to the openreq sid.
997 *
998 * Security hooks for XFRM operations.
999 *
1000 * @xfrm_policy_alloc_security:
1001 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1002 * Database used by the XFRM system.
1003 * @sec_ctx contains the security context information being provided by
1004 * the user-level policy update program (e.g., setkey).
1005 * Allocate a security structure to the xp->security field; the security
1006 * field is initialized to NULL when the xfrm_policy is allocated.
1007 * Return 0 if operation was successful (memory to allocate, legal context)
1008 * @xfrm_policy_clone_security:
1009 * @old_ctx contains an existing xfrm_sec_ctx.
1010 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1011 * Allocate a security structure in new_ctxp that contains the
1012 * information from the old_ctx structure.
1013 * Return 0 if operation was successful (memory to allocate).
1014 * @xfrm_policy_free_security:
1015 * @ctx contains the xfrm_sec_ctx
1016 * Deallocate xp->security.
1017 * @xfrm_policy_delete_security:
1018 * @ctx contains the xfrm_sec_ctx.
1019 * Authorize deletion of xp->security.
1020 * @xfrm_state_alloc_security:
1021 * @x contains the xfrm_state being added to the Security Association
1022 * Database by the XFRM system.
1023 * @sec_ctx contains the security context information being provided by
1024 * the user-level SA generation program (e.g., setkey or racoon).
1025 * @secid contains the secid from which to take the mls portion of the context.
1026 * Allocate a security structure to the x->security field; the security
1027 * field is initialized to NULL when the xfrm_state is allocated. Set the
1028 * context to correspond to either sec_ctx or polsec, with the mls portion
1029 * taken from secid in the latter case.
1030 * Return 0 if operation was successful (memory to allocate, legal context).
1031 * @xfrm_state_free_security:
1032 * @x contains the xfrm_state.
1033 * Deallocate x->security.
1034 * @xfrm_state_delete_security:
1035 * @x contains the xfrm_state.
1036 * Authorize deletion of x->security.
1037 * @xfrm_policy_lookup:
1038 * @ctx contains the xfrm_sec_ctx for which the access control is being
1039 * checked.
1040 * @fl_secid contains the flow security label that is used to authorize
1041 * access to the policy xp.
1042 * @dir contains the direction of the flow (input or output).
1043 * Check permission when a flow selects a xfrm_policy for processing
1044 * XFRMs on a packet. The hook is called when selecting either a
1045 * per-socket policy or a generic xfrm policy.
1046 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1047 * on other errors.
1048 * @xfrm_state_pol_flow_match:
1049 * @x contains the state to match.
1050 * @xp contains the policy to check for a match.
1051 * @fl contains the flow to check for a match.
1052 * Return 1 if there is a match.
1053 * @xfrm_decode_session:
1054 * @skb points to skb to decode.
1055 * @secid points to the flow key secid to set.
1056 * @ckall says if all xfrms used should be checked for same secid.
1057 * Return 0 if ckall is zero or all xfrms used have the same secid.
1058 *
1059 * Security hooks affecting all Key Management operations
1060 *
1061 * @key_alloc:
1062 * Permit allocation of a key and assign security data. Note that key does
1063 * not have a serial number assigned at this point.
1064 * @key points to the key.
1065 * @flags is the allocation flags
1066 * Return 0 if permission is granted, -ve error otherwise.
1067 * @key_free:
1068 * Notification of destruction; free security data.
1069 * @key points to the key.
1070 * No return value.
1071 * @key_permission:
1072 * See whether a specific operational right is granted to a process on a
1073 * key.
1074 * @key_ref refers to the key (key pointer + possession attribute bit).
1075 * @cred points to the credentials to provide the context against which to
1076 * evaluate the security data on the key.
1077 * @perm describes the combination of permissions required of this key.
1078 * Return 1 if permission granted, 0 if permission denied and -ve it the
1079 * normal permissions model should be effected.
1080 * @key_getsecurity:
1081 * Get a textual representation of the security context attached to a key
1082 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1083 * allocates the storage for the NUL-terminated string and the caller
1084 * should free it.
1085 * @key points to the key to be queried.
1086 * @_buffer points to a pointer that should be set to point to the
1087 * resulting string (if no label or an error occurs).
1088 * Return the length of the string (including terminating NUL) or -ve if
1089 * an error.
1090 * May also return 0 (and a NULL buffer pointer) if there is no label.
1091 *
1092 * Security hooks affecting all System V IPC operations.
1093 *
1094 * @ipc_permission:
1095 * Check permissions for access to IPC
1096 * @ipcp contains the kernel IPC permission structure
1097 * @flag contains the desired (requested) permission set
1098 * Return 0 if permission is granted.
1099 * @ipc_getsecid:
1100 * Get the secid associated with the ipc object.
1101 * @ipcp contains the kernel IPC permission structure.
1102 * @secid contains a pointer to the location where result will be saved.
1103 * In case of failure, @secid will be set to zero.
1104 *
1105 * Security hooks for individual messages held in System V IPC message queues
1106 * @msg_msg_alloc_security:
1107 * Allocate and attach a security structure to the msg->security field.
1108 * The security field is initialized to NULL when the structure is first
1109 * created.
1110 * @msg contains the message structure to be modified.
1111 * Return 0 if operation was successful and permission is granted.
1112 * @msg_msg_free_security:
1113 * Deallocate the security structure for this message.
1114 * @msg contains the message structure to be modified.
1115 *
1116 * Security hooks for System V IPC Message Queues
1117 *
1118 * @msg_queue_alloc_security:
1119 * Allocate and attach a security structure to the
1120 * msq->q_perm.security field. The security field is initialized to
1121 * NULL when the structure is first created.
1122 * @msq contains the message queue structure to be modified.
1123 * Return 0 if operation was successful and permission is granted.
1124 * @msg_queue_free_security:
1125 * Deallocate security structure for this message queue.
1126 * @msq contains the message queue structure to be modified.
1127 * @msg_queue_associate:
1128 * Check permission when a message queue is requested through the
1129 * msgget system call. This hook is only called when returning the
1130 * message queue identifier for an existing message queue, not when a
1131 * new message queue is created.
1132 * @msq contains the message queue to act upon.
1133 * @msqflg contains the operation control flags.
1134 * Return 0 if permission is granted.
1135 * @msg_queue_msgctl:
1136 * Check permission when a message control operation specified by @cmd
1137 * is to be performed on the message queue @msq.
1138 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1139 * @msq contains the message queue to act upon. May be NULL.
1140 * @cmd contains the operation to be performed.
1141 * Return 0 if permission is granted.
1142 * @msg_queue_msgsnd:
1143 * Check permission before a message, @msg, is enqueued on the message
1144 * queue, @msq.
1145 * @msq contains the message queue to send message to.
1146 * @msg contains the message to be enqueued.
1147 * @msqflg contains operational flags.
1148 * Return 0 if permission is granted.
1149 * @msg_queue_msgrcv:
1150 * Check permission before a message, @msg, is removed from the message
1151 * queue, @msq. The @target task structure contains a pointer to the
1152 * process that will be receiving the message (not equal to the current
1153 * process when inline receives are being performed).
1154 * @msq contains the message queue to retrieve message from.
1155 * @msg contains the message destination.
1156 * @target contains the task structure for recipient process.
1157 * @type contains the type of message requested.
1158 * @mode contains the operational flags.
1159 * Return 0 if permission is granted.
1160 *
1161 * Security hooks for System V Shared Memory Segments
1162 *
1163 * @shm_alloc_security:
1164 * Allocate and attach a security structure to the shp->shm_perm.security
1165 * field. The security field is initialized to NULL when the structure is
1166 * first created.
1167 * @shp contains the shared memory structure to be modified.
1168 * Return 0 if operation was successful and permission is granted.
1169 * @shm_free_security:
1170 * Deallocate the security struct for this memory segment.
1171 * @shp contains the shared memory structure to be modified.
1172 * @shm_associate:
1173 * Check permission when a shared memory region is requested through the
1174 * shmget system call. This hook is only called when returning the shared
1175 * memory region identifier for an existing region, not when a new shared
1176 * memory region is created.
1177 * @shp contains the shared memory structure to be modified.
1178 * @shmflg contains the operation control flags.
1179 * Return 0 if permission is granted.
1180 * @shm_shmctl:
1181 * Check permission when a shared memory control operation specified by
1182 * @cmd is to be performed on the shared memory region @shp.
1183 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1184 * @shp contains shared memory structure to be modified.
1185 * @cmd contains the operation to be performed.
1186 * Return 0 if permission is granted.
1187 * @shm_shmat:
1188 * Check permissions prior to allowing the shmat system call to attach the
1189 * shared memory segment @shp to the data segment of the calling process.
1190 * The attaching address is specified by @shmaddr.
1191 * @shp contains the shared memory structure to be modified.
1192 * @shmaddr contains the address to attach memory region to.
1193 * @shmflg contains the operational flags.
1194 * Return 0 if permission is granted.
1195 *
1196 * Security hooks for System V Semaphores
1197 *
1198 * @sem_alloc_security:
1199 * Allocate and attach a security structure to the sma->sem_perm.security
1200 * field. The security field is initialized to NULL when the structure is
1201 * first created.
1202 * @sma contains the semaphore structure
1203 * Return 0 if operation was successful and permission is granted.
1204 * @sem_free_security:
1205 * deallocate security struct for this semaphore
1206 * @sma contains the semaphore structure.
1207 * @sem_associate:
1208 * Check permission when a semaphore is requested through the semget
1209 * system call. This hook is only called when returning the semaphore
1210 * identifier for an existing semaphore, not when a new one must be
1211 * created.
1212 * @sma contains the semaphore structure.
1213 * @semflg contains the operation control flags.
1214 * Return 0 if permission is granted.
1215 * @sem_semctl:
1216 * Check permission when a semaphore operation specified by @cmd is to be
1217 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1218 * IPC_INFO or SEM_INFO.
1219 * @sma contains the semaphore structure. May be NULL.
1220 * @cmd contains the operation to be performed.
1221 * Return 0 if permission is granted.
1222 * @sem_semop
1223 * Check permissions before performing operations on members of the
1224 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1225 * may be modified.
1226 * @sma contains the semaphore structure.
1227 * @sops contains the operations to perform.
1228 * @nsops contains the number of operations to perform.
1229 * @alter contains the flag indicating whether changes are to be made.
1230 * Return 0 if permission is granted.
1231 *
1232 * @ptrace_may_access:
1233 * Check permission before allowing the current process to trace the
1234 * @child process.
1235 * Security modules may also want to perform a process tracing check
1236 * during an execve in the set_security or apply_creds hooks of
1237 * tracing check during an execve in the bprm_set_creds hook of
1238 * binprm_security_ops if the process is being traced and its security
1239 * attributes would be changed by the execve.
1240 * @child contains the task_struct structure for the target process.
1241 * @mode contains the PTRACE_MODE flags indicating the form of access.
1242 * Return 0 if permission is granted.
1243 * @ptrace_traceme:
1244 * Check that the @parent process has sufficient permission to trace the
1245 * current process before allowing the current process to present itself
1246 * to the @parent process for tracing.
1247 * The parent process will still have to undergo the ptrace_may_access
1248 * checks before it is allowed to trace this one.
1249 * @parent contains the task_struct structure for debugger process.
1250 * Return 0 if permission is granted.
1251 * @capget:
1252 * Get the @effective, @inheritable, and @permitted capability sets for
1253 * the @target process. The hook may also perform permission checking to
1254 * determine if the current process is allowed to see the capability sets
1255 * of the @target process.
1256 * @target contains the task_struct 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 if the capability sets were successfully obtained.
1261 * @capset:
1262 * Set the @effective, @inheritable, and @permitted capability sets for
1263 * the current process.
1264 * @new contains the new credentials structure for target process.
1265 * @old contains the current credentials structure for target process.
1266 * @effective contains the effective capability set.
1267 * @inheritable contains the inheritable capability set.
1268 * @permitted contains the permitted capability set.
1269 * Return 0 and update @new if permission is granted.
1270 * @capable:
1271 * Check whether the @tsk process has the @cap capability in the indicated
1272 * credentials.
1273 * @tsk contains the task_struct for the process.
1274 * @cred contains the credentials to use.
1275 * @cap contains the capability <include/linux/capability.h>.
1276 * @audit: Whether to write an audit message or not
1277 * Return 0 if the capability is granted for @tsk.
1278 * @acct:
1279 * Check permission before enabling or disabling process accounting. If
1280 * accounting is being enabled, then @file refers to the open file used to
1281 * store accounting records. If accounting is being disabled, then @file
1282 * is NULL.
1283 * @file contains the file structure for the accounting file (may be NULL).
1284 * Return 0 if permission is granted.
1285 * @sysctl:
1286 * Check permission before accessing the @table sysctl variable in the
1287 * manner specified by @op.
1288 * @table contains the ctl_table structure for the sysctl variable.
1289 * @op contains the operation (001 = search, 002 = write, 004 = read).
1290 * Return 0 if permission is granted.
1291 * @syslog:
1292 * Check permission before accessing the kernel message ring or changing
1293 * logging to the console.
1294 * See the syslog(2) manual page for an explanation of the @type values.
1295 * @type contains the type of action.
1296 * Return 0 if permission is granted.
1297 * @settime:
1298 * Check permission to change the system time.
1299 * struct timespec and timezone are defined in include/linux/time.h
1300 * @ts contains new time
1301 * @tz contains new timezone
1302 * Return 0 if permission is granted.
1303 * @vm_enough_memory:
1304 * Check permissions for allocating a new virtual mapping.
1305 * @mm contains the mm struct it is being added to.
1306 * @pages contains the number of pages.
1307 * Return 0 if permission is granted.
1308 *
1309 * @secid_to_secctx:
1310 * Convert secid to security context.
1311 * @secid contains the security ID.
1312 * @secdata contains the pointer that stores the converted security context.
1313 * @secctx_to_secid:
1314 * Convert security context to secid.
1315 * @secid contains the pointer to the generated security ID.
1316 * @secdata contains the security context.
1317 *
1318 * @release_secctx:
1319 * Release the security context.
1320 * @secdata contains the security context.
1321 * @seclen contains the length of the security context.
1322 *
1323 * Security hooks for Audit
1324 *
1325 * @audit_rule_init:
1326 * Allocate and initialize an LSM audit rule structure.
1327 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1328 * @op contains the operator the rule uses.
1329 * @rulestr contains the context where the rule will be applied to.
1330 * @lsmrule contains a pointer to receive the result.
1331 * Return 0 if @lsmrule has been successfully set,
1332 * -EINVAL in case of an invalid rule.
1333 *
1334 * @audit_rule_known:
1335 * Specifies whether given @rule contains any fields related to current LSM.
1336 * @rule contains the audit rule of interest.
1337 * Return 1 in case of relation found, 0 otherwise.
1338 *
1339 * @audit_rule_match:
1340 * Determine if given @secid matches a rule previously approved
1341 * by @audit_rule_known.
1342 * @secid contains the security id in question.
1343 * @field contains the field which relates to current LSM.
1344 * @op contains the operator that will be used for matching.
1345 * @rule points to the audit rule that will be checked against.
1346 * @actx points to the audit context associated with the check.
1347 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1348 *
1349 * @audit_rule_free:
1350 * Deallocate the LSM audit rule structure previously allocated by
1351 * audit_rule_init.
1352 * @rule contains the allocated rule
1353 *
1354 * This is the main security structure.
1355 */
1411 #ifdef CONFIG_SECURITY_PATH
1425 #endif
1459 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1460 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1488 gfp_t gfp);
1559 #ifdef CONFIG_SECURITY_NETWORK
1583 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1597 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1600 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1605 u32 secid);
1615 /* key management security hooks */
1616 #ifdef CONFIG_KEYS
1621 key_perm_t perm);
1625 #ifdef CONFIG_AUDIT
1632 };
1634 /* prototypes */
1639 /* Security operations */
1718 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1719 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1801 };
1804 {
1805 }
1808 {
1809 }
1811 /*
1812 * This is the default capabilities functionality. Most of these functions
1813 * are just stubbed out, but a few must call the proper capable code.
1814 */
1817 {
1819 }
1823 {
1825 }
1828 {
1830 }
1836 {
1838 }
1845 {
1847 }
1850 {
1852 }
1855 {
1862 }
1866 {
1871 SECURITY_CAP_NOAUDIT);
1874 }
1877 {
1879 }
1882 {
1884 }
1888 {
1890 }
1893 {
1895 }
1898 {
1900 }
1903 {
1905 }
1908 {
1911 }
1914 {
1917 }
1920 {
1921 /* If current->mm is a kernel thread then we will pass NULL,
1922 for this specific case that is fine */
1924 }
1927 {
1929 }
1932 {
1934 }
1937 {
1938 }
1941 {
1942 }
1945 {
1947 }
1950 {
1952 }
1955 { }
1958 {
1960 }
1963 {
1965 }
1969 {
1971 }
1974 {
1976 }
1981 {
1983 }
1987 {
1989 }
1992 {
1994 }
1997 { }
2000 { }
2004 { }
2008 { }
2012 {
2014 }
2018 { }
2022 {
2024 }
2028 { }
2031 {
2033 }
2036 {
2038 }
2041 { }
2048 {
2050 }
2055 {
2057 }
2062 {
2064 }
2068 {
2070 }
2075 {
2077 }
2082 {
2084 }
2088 {
2090 }
2095 {
2097 }
2103 {
2105 }
2108 {
2110 }
2114 {
2116 }
2119 {
2121 }
2125 {
2127 }
2131 {
2133 }
2136 { }
2140 {
2142 }
2146 { }
2150 {
2152 }
2155 {
2157 }
2161 {
2163 }
2166 {
2168 }
2171 {
2173 }
2175 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2176 {
2178 }
2180 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2181 {
2183 }
2185 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2186 {
2188 }
2191 {
2193 }
2196 {
2198 }
2201 {
2203 }
2206 { }
2210 {
2212 }
2219 {
2221 }
2226 {
2228 }
2231 {
2233 }
2237 {
2239 }
2242 {
2244 }
2249 {
2251 }
2254 {
2256 }
2260 {
2262 }
2265 {
2267 }
2270 { }
2274 gfp_t gfp)
2275 {
2277 }
2281 {
2282 }
2285 {
2287 }
2291 {
2293 }
2297 {
2299 }
2304 {
2306 }
2310 {
2312 }
2315 {
2317 }
2320 {
2322 }
2325 {
2327 }
2330 {
2332 }
2335 {
2337 }
2340 {
2342 }
2345 {
2347 }
2350 {
2352 }
2356 {
2358 }
2363 {
2365 }
2368 {
2370 }
2373 {
2375 }
2379 u32 secid)
2380 {
2382 }
2385 {
2387 }
2393 {
2395 }
2398 { }
2402 {
2404 }
2407 {
2409 }
2412 {
2414 }
2417 { }
2420 {
2422 }
2425 { }
2429 {
2431 }
2434 {
2436 }
2440 {
2442 }
2448 {
2450 }
2453 {
2455 }
2458 { }
2462 {
2464 }
2467 {
2469 }
2473 {
2475 }
2478 {
2480 }
2483 { }
2486 {
2488 }
2491 {
2493 }
2498 {
2500 }
2503 { }
2506 {
2508 }
2510 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2511 {
2513 }
2516 {
2518 }
2521 {
2523 }
2526 {
2528 }
2531 u32 seclen,
2533 {
2535 }
2538 {
2539 }
2542 #ifdef CONFIG_SECURITY_NETWORK
2583 {
2585 }
2589 {
2591 }
2595 {
2597 }
2603 {
2605 }
2610 {
2612 }
2617 {
2619 }
2622 {
2624 }
2628 {
2630 }
2634 {
2636 }
2641 {
2643 }
2646 {
2648 }
2651 {
2653 }
2657 {
2659 }
2663 {
2665 }
2668 {
2670 }
2673 {
2675 }
2679 {
2681 }
2683 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2684 {
2686 }
2689 {
2691 }
2694 {
2695 }
2698 {
2699 }
2702 {
2703 }
2705 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2706 {
2707 }
2710 {
2711 }
2715 {
2717 }
2721 {
2722 }
2726 {
2727 }
2730 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2749 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2750 {
2752 }
2754 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2755 {
2757 }
2760 {
2761 }
2764 {
2766 }
2770 {
2772 }
2776 {
2778 }
2781 {
2782 }
2785 {
2787 }
2790 {
2792 }
2796 {
2798 }
2801 {
2803 }
2806 {
2807 }
2811 #ifdef CONFIG_SECURITY_PATH
2827 {
2829 }
2833 {
2835 }
2838 {
2840 }
2844 {
2846 }
2850 {
2852 }
2856 {
2858 }
2863 {
2865 }
2871 {
2873 }
2876 #ifdef CONFIG_KEYS
2877 #ifdef CONFIG_SECURITY
2885 #else
2890 {
2892 }
2895 {
2896 }
2900 key_perm_t perm)
2901 {
2903 }
2906 {
2909 }
2911 #endif
2914 #ifdef CONFIG_AUDIT
2915 #ifdef CONFIG_SECURITY
2922 #else
2926 {
2928 }
2931 {
2933 }
2937 {
2939 }
2942 { }
2947 #ifdef CONFIG_SECURITYFS
2959 {
2961 }
2964 mode_t mode,
2968 {
2970 }
2973 {}
2975 #endif
2977 #ifdef CONFIG_SECURITY
2980 {
2982 }
2985 {
2987 }
2989 #else
2992 {
2994 }
2997 { }