| blob | 50737c70e78ea41e2a2e4551b6044df86f8a1de3 |
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>
31 #include <linux/msg.h>
32 #include <linux/sched.h>
33 #include <linux/key.h>
34 #include <linux/xfrm.h>
35 #include <net/flow.h>
37 /* Maximum number of letters for an LSM name string */
38 #define SECURITY_NAME_MAX 10
43 /*
44 * These functions are in security/capability.c and are used
45 * as the default capabilities functions
46 */
50 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
51 extern int cap_capset_check(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
52 extern void cap_capset_set(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
87 /*
88 * Values used in the task_security_ops calls
89 */
90 /* setuid or setgid, id0 == uid or gid */
91 #define LSM_SETID_ID 1
93 /* setreuid or setregid, id0 == real, id1 == eff */
94 #define LSM_SETID_RE 2
96 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
97 #define LSM_SETID_RES 4
99 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
100 #define LSM_SETID_FS 8
102 /* forward declares to avoid warnings */
108 /* bprm_apply_creds unsafe reasons */
109 #define LSM_UNSAFE_SHARE 1
110 #define LSM_UNSAFE_PTRACE 2
111 #define LSM_UNSAFE_PTRACE_CAP 4
113 #ifdef CONFIG_SECURITY
119 };
122 {
126 }
129 {
139 }
141 /**
142 * struct security_operations - main security structure
143 *
144 * Security module identifier.
145 *
146 * @name:
147 * A string that acts as a unique identifeir for the LSM with max number
148 * of characters = SECURITY_NAME_MAX.
149 *
150 * Security hooks for program execution operations.
151 *
152 * @bprm_alloc_security:
153 * Allocate and attach a security structure to the @bprm->security field.
154 * The security field is initialized to NULL when the bprm structure is
155 * allocated.
156 * @bprm contains the linux_binprm structure to be modified.
157 * Return 0 if operation was successful.
158 * @bprm_free_security:
159 * @bprm contains the linux_binprm structure to be modified.
160 * Deallocate and clear the @bprm->security field.
161 * @bprm_apply_creds:
162 * Compute and set the security attributes of a process being transformed
163 * by an execve operation based on the old attributes (current->security)
164 * and the information saved in @bprm->security by the set_security hook.
165 * Since this hook function (and its caller) are void, this hook can not
166 * return an error. However, it can leave the security attributes of the
167 * process unchanged if an access failure occurs at this point.
168 * bprm_apply_creds is called under task_lock. @unsafe indicates various
169 * reasons why it may be unsafe to change security state.
170 * @bprm contains the linux_binprm structure.
171 * @bprm_post_apply_creds:
172 * Runs after bprm_apply_creds with the task_lock dropped, so that
173 * functions which cannot be called safely under the task_lock can
174 * be used. This hook is a good place to perform state changes on
175 * the process such as closing open file descriptors to which access
176 * is no longer granted if the attributes were changed.
177 * Note that a security module might need to save state between
178 * bprm_apply_creds and bprm_post_apply_creds to store the decision
179 * on whether the process may proceed.
180 * @bprm contains the linux_binprm structure.
181 * @bprm_set_security:
182 * Save security information in the bprm->security field, typically based
183 * on information about the bprm->file, for later use by the apply_creds
184 * hook. This hook may also optionally check permissions (e.g. for
185 * transitions between security domains).
186 * This hook may be called multiple times during a single execve, e.g. for
187 * interpreters. The hook can tell whether it has already been called by
188 * checking to see if @bprm->security is non-NULL. If so, then the hook
189 * may decide either to retain the security information saved earlier or
190 * to replace it.
191 * @bprm contains the linux_binprm structure.
192 * Return 0 if the hook is successful and permission is granted.
193 * @bprm_check_security:
194 * This hook mediates the point when a search for a binary handler will
195 * begin. It allows a check the @bprm->security value which is set in
196 * the preceding set_security call. The primary difference from
197 * set_security is that the argv list and envp list are reliably
198 * available in @bprm. This hook may be called multiple times
199 * during a single execve; and in each pass set_security is called
200 * first.
201 * @bprm contains the linux_binprm structure.
202 * Return 0 if the hook is successful and permission is granted.
203 * @bprm_secureexec:
204 * Return a boolean value (0 or 1) indicating whether a "secure exec"
205 * is required. The flag is passed in the auxiliary table
206 * on the initial stack to the ELF interpreter to indicate whether libc
207 * should enable secure mode.
208 * @bprm contains the linux_binprm structure.
209 *
210 * Security hooks for filesystem operations.
211 *
212 * @sb_alloc_security:
213 * Allocate and attach a security structure to the sb->s_security field.
214 * The s_security field is initialized to NULL when the structure is
215 * allocated.
216 * @sb contains the super_block structure to be modified.
217 * Return 0 if operation was successful.
218 * @sb_free_security:
219 * Deallocate and clear the sb->s_security field.
220 * @sb contains the super_block structure to be modified.
221 * @sb_statfs:
222 * Check permission before obtaining filesystem statistics for the @mnt
223 * mountpoint.
224 * @dentry is a handle on the superblock for the filesystem.
225 * Return 0 if permission is granted.
226 * @sb_mount:
227 * Check permission before an object specified by @dev_name is mounted on
228 * the mount point named by @nd. For an ordinary mount, @dev_name
229 * identifies a device if the file system type requires a device. For a
230 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
231 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
232 * pathname of the object being mounted.
233 * @dev_name contains the name for object being mounted.
234 * @path contains the path for mount point object.
235 * @type contains the filesystem type.
236 * @flags contains the mount flags.
237 * @data contains the filesystem-specific data.
238 * Return 0 if permission is granted.
239 * @sb_copy_data:
240 * Allow mount option data to be copied prior to parsing by the filesystem,
241 * so that the security module can extract security-specific mount
242 * options cleanly (a filesystem may modify the data e.g. with strsep()).
243 * This also allows the original mount data to be stripped of security-
244 * specific options to avoid having to make filesystems aware of them.
245 * @type the type of filesystem being mounted.
246 * @orig the original mount data copied from userspace.
247 * @copy copied data which will be passed to the security module.
248 * Returns 0 if the copy was successful.
249 * @sb_check_sb:
250 * Check permission before the device with superblock @mnt->sb is mounted
251 * on the mount point named by @nd.
252 * @mnt contains the vfsmount for device being mounted.
253 * @path contains the path for the mount point.
254 * Return 0 if permission is granted.
255 * @sb_umount:
256 * Check permission before the @mnt file system is unmounted.
257 * @mnt contains the mounted file system.
258 * @flags contains the unmount flags, e.g. MNT_FORCE.
259 * Return 0 if permission is granted.
260 * @sb_umount_close:
261 * Close any files in the @mnt mounted filesystem that are held open by
262 * the security module. This hook is called during an umount operation
263 * prior to checking whether the filesystem is still busy.
264 * @mnt contains the mounted filesystem.
265 * @sb_umount_busy:
266 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
267 * any files that were closed by umount_close. This hook is called during
268 * an umount operation if the umount fails after a call to the
269 * umount_close hook.
270 * @mnt contains the mounted filesystem.
271 * @sb_post_remount:
272 * Update the security module's state when a filesystem is remounted.
273 * This hook is only called if the remount was successful.
274 * @mnt contains the mounted file system.
275 * @flags contains the new filesystem flags.
276 * @data contains the filesystem-specific data.
277 * @sb_post_addmount:
278 * Update the security module's state when a filesystem is mounted.
279 * This hook is called any time a mount is successfully grafetd to
280 * the tree.
281 * @mnt contains the mounted filesystem.
282 * @mountpoint contains the path for the mount point.
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_post_pivotroot:
289 * Update module state after a successful pivot.
290 * @old_path contains the path for the old root.
291 * @new_path contains the path for the new root.
292 * @sb_get_mnt_opts:
293 * Get the security relevant mount options used for a superblock
294 * @sb the superblock to get security mount options from
295 * @opts binary data structure containing all lsm mount data
296 * @sb_set_mnt_opts:
297 * Set the security relevant mount options used for a superblock
298 * @sb the superblock to set security mount options for
299 * @opts binary data structure containing all lsm mount data
300 * @sb_clone_mnt_opts:
301 * Copy all security options from a given superblock to another
302 * @oldsb old superblock which contain information to clone
303 * @newsb new superblock which needs filled in
304 * @sb_parse_opts_str:
305 * Parse a string of security data filling in the opts structure
306 * @options string containing all mount options known by the LSM
307 * @opts binary data structure usable by the LSM
308 *
309 * Security hooks for inode operations.
310 *
311 * @inode_alloc_security:
312 * Allocate and attach a security structure to @inode->i_security. The
313 * i_security field is initialized to NULL when the inode structure is
314 * allocated.
315 * @inode contains the inode structure.
316 * Return 0 if operation was successful.
317 * @inode_free_security:
318 * @inode contains the inode structure.
319 * Deallocate the inode security structure and set @inode->i_security to
320 * NULL.
321 * @inode_init_security:
322 * Obtain the security attribute name suffix and value to set on a newly
323 * created inode and set up the incore security field for the new inode.
324 * This hook is called by the fs code as part of the inode creation
325 * transaction and provides for atomic labeling of the inode, unlike
326 * the post_create/mkdir/... hooks called by the VFS. The hook function
327 * is expected to allocate the name and value via kmalloc, with the caller
328 * being responsible for calling kfree after using them.
329 * If the security module does not use security attributes or does
330 * not wish to put a security attribute on this particular inode,
331 * then it should return -EOPNOTSUPP to skip this processing.
332 * @inode contains the inode structure of the newly created inode.
333 * @dir contains the inode structure of the parent directory.
334 * @name will be set to the allocated name suffix (e.g. selinux).
335 * @value will be set to the allocated attribute value.
336 * @len will be set to the length of the value.
337 * Returns 0 if @name and @value have been successfully set,
338 * -EOPNOTSUPP if no security attribute is needed, or
339 * -ENOMEM on memory allocation failure.
340 * @inode_create:
341 * Check permission to create a regular file.
342 * @dir contains inode structure of the parent of the new file.
343 * @dentry contains the dentry structure for the file to be created.
344 * @mode contains the file mode of the file to be created.
345 * Return 0 if permission is granted.
346 * @inode_link:
347 * Check permission before creating a new hard link to a file.
348 * @old_dentry contains the dentry structure for an existing link to the file.
349 * @dir contains the inode structure of the parent directory of the new link.
350 * @new_dentry contains the dentry structure for the new link.
351 * Return 0 if permission is granted.
352 * @inode_unlink:
353 * Check the permission to remove a hard link to a file.
354 * @dir contains the inode structure of parent directory of the file.
355 * @dentry contains the dentry structure for file to be unlinked.
356 * Return 0 if permission is granted.
357 * @inode_symlink:
358 * Check the permission to create a symbolic link to a file.
359 * @dir contains the inode structure of parent directory of the symbolic link.
360 * @dentry contains the dentry structure of the symbolic link.
361 * @old_name contains the pathname of file.
362 * Return 0 if permission is granted.
363 * @inode_mkdir:
364 * Check permissions to create a new directory in the existing directory
365 * associated with inode strcture @dir.
366 * @dir containst the inode structure of parent of the directory to be created.
367 * @dentry contains the dentry structure of new directory.
368 * @mode contains the mode of new directory.
369 * Return 0 if permission is granted.
370 * @inode_rmdir:
371 * Check the permission to remove a directory.
372 * @dir contains the inode structure of parent of the directory to be removed.
373 * @dentry contains the dentry structure of directory to be removed.
374 * Return 0 if permission is granted.
375 * @inode_mknod:
376 * Check permissions when creating a special file (or a socket or a fifo
377 * file created via the mknod system call). Note that if mknod operation
378 * is being done for a regular file, then the create hook will be called
379 * and not this hook.
380 * @dir contains the inode structure of parent of the new file.
381 * @dentry contains the dentry structure of the new file.
382 * @mode contains the mode of the new file.
383 * @dev contains the device number.
384 * Return 0 if permission is granted.
385 * @inode_rename:
386 * Check for permission to rename a file or directory.
387 * @old_dir contains the inode structure for parent of the old link.
388 * @old_dentry contains the dentry structure of the old link.
389 * @new_dir contains the inode structure for parent of the new link.
390 * @new_dentry contains the dentry structure of the new link.
391 * Return 0 if permission is granted.
392 * @inode_readlink:
393 * Check the permission to read the symbolic link.
394 * @dentry contains the dentry structure for the file link.
395 * Return 0 if permission is granted.
396 * @inode_follow_link:
397 * Check permission to follow a symbolic link when looking up a pathname.
398 * @dentry contains the dentry structure for the link.
399 * @nd contains the nameidata structure for the parent directory.
400 * Return 0 if permission is granted.
401 * @inode_permission:
402 * Check permission before accessing an inode. This hook is called by the
403 * existing Linux permission function, so a security module can use it to
404 * provide additional checking for existing Linux permission checks.
405 * Notice that this hook is called when a file is opened (as well as many
406 * other operations), whereas the file_security_ops permission hook is
407 * called when the actual read/write operations are performed.
408 * @inode contains the inode structure to check.
409 * @mask contains the permission mask.
410 * @nd contains the nameidata (may be NULL).
411 * Return 0 if permission is granted.
412 * @inode_setattr:
413 * Check permission before setting file attributes. Note that the kernel
414 * call to notify_change is performed from several locations, whenever
415 * file attributes change (such as when a file is truncated, chown/chmod
416 * operations, transferring disk quotas, etc).
417 * @dentry contains the dentry structure for the file.
418 * @attr is the iattr structure containing the new file attributes.
419 * Return 0 if permission is granted.
420 * @inode_getattr:
421 * Check permission before obtaining file attributes.
422 * @mnt is the vfsmount where the dentry was looked up
423 * @dentry contains the dentry structure for the file.
424 * Return 0 if permission is granted.
425 * @inode_delete:
426 * @inode contains the inode structure for deleted inode.
427 * This hook is called when a deleted inode is released (i.e. an inode
428 * with no hard links has its use count drop to zero). A security module
429 * can use this hook to release any persistent label associated with the
430 * inode.
431 * @inode_setxattr:
432 * Check permission before setting the extended attributes
433 * @value identified by @name for @dentry.
434 * Return 0 if permission is granted.
435 * @inode_post_setxattr:
436 * Update inode security field after successful setxattr operation.
437 * @value identified by @name for @dentry.
438 * @inode_getxattr:
439 * Check permission before obtaining the extended attributes
440 * identified by @name for @dentry.
441 * Return 0 if permission is granted.
442 * @inode_listxattr:
443 * Check permission before obtaining the list of extended attribute
444 * names for @dentry.
445 * Return 0 if permission is granted.
446 * @inode_removexattr:
447 * Check permission before removing the extended attribute
448 * identified by @name for @dentry.
449 * Return 0 if permission is granted.
450 * @inode_getsecurity:
451 * Retrieve a copy of the extended attribute representation of the
452 * security label associated with @name for @inode via @buffer. Note that
453 * @name is the remainder of the attribute name after the security prefix
454 * has been removed. @alloc is used to specify of the call should return a
455 * value via the buffer or just the value length Return size of buffer on
456 * success.
457 * @inode_setsecurity:
458 * Set the security label associated with @name for @inode from the
459 * extended attribute value @value. @size indicates the size of the
460 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
461 * Note that @name is the remainder of the attribute name after the
462 * security. prefix has been removed.
463 * Return 0 on success.
464 * @inode_listsecurity:
465 * Copy the extended attribute names for the security labels
466 * associated with @inode into @buffer. The maximum size of @buffer
467 * is specified by @buffer_size. @buffer may be NULL to request
468 * the size of the buffer required.
469 * Returns number of bytes used/required on success.
470 * @inode_need_killpriv:
471 * Called when an inode has been changed.
472 * @dentry is the dentry being changed.
473 * Return <0 on error to abort the inode change operation.
474 * Return 0 if inode_killpriv does not need to be called.
475 * Return >0 if inode_killpriv does need to be called.
476 * @inode_killpriv:
477 * The setuid bit is being removed. Remove similar security labels.
478 * Called with the dentry->d_inode->i_mutex held.
479 * @dentry is the dentry being changed.
480 * Return 0 on success. If error is returned, then the operation
481 * causing setuid bit removal is failed.
482 * @inode_getsecid:
483 * Get the secid associated with the node.
484 * @inode contains a pointer to the inode.
485 * @secid contains a pointer to the location where result will be saved.
486 * In case of failure, @secid will be set to zero.
487 *
488 * Security hooks for file operations
489 *
490 * @file_permission:
491 * Check file permissions before accessing an open file. This hook is
492 * called by various operations that read or write files. A security
493 * module can use this hook to perform additional checking on these
494 * operations, e.g. to revalidate permissions on use to support privilege
495 * bracketing or policy changes. Notice that this hook is used when the
496 * actual read/write operations are performed, whereas the
497 * inode_security_ops hook is called when a file is opened (as well as
498 * many other operations).
499 * Caveat: Although this hook can be used to revalidate permissions for
500 * various system call operations that read or write files, it does not
501 * address the revalidation of permissions for memory-mapped files.
502 * Security modules must handle this separately if they need such
503 * revalidation.
504 * @file contains the file structure being accessed.
505 * @mask contains the requested permissions.
506 * Return 0 if permission is granted.
507 * @file_alloc_security:
508 * Allocate and attach a security structure to the file->f_security field.
509 * The security field is initialized to NULL when the structure is first
510 * created.
511 * @file contains the file structure to secure.
512 * Return 0 if the hook is successful and permission is granted.
513 * @file_free_security:
514 * Deallocate and free any security structures stored in file->f_security.
515 * @file contains the file structure being modified.
516 * @file_ioctl:
517 * @file contains the file structure.
518 * @cmd contains the operation to perform.
519 * @arg contains the operational arguments.
520 * Check permission for an ioctl operation on @file. Note that @arg can
521 * sometimes represents a user space pointer; in other cases, it may be a
522 * simple integer value. When @arg represents a user space pointer, it
523 * should never be used by the security module.
524 * Return 0 if permission is granted.
525 * @file_mmap :
526 * Check permissions for a mmap operation. The @file may be NULL, e.g.
527 * if mapping anonymous memory.
528 * @file contains the file structure for file to map (may be NULL).
529 * @reqprot contains the protection requested by the application.
530 * @prot contains the protection that will be applied by the kernel.
531 * @flags contains the operational flags.
532 * Return 0 if permission is granted.
533 * @file_mprotect:
534 * Check permissions before changing memory access permissions.
535 * @vma contains the memory region to modify.
536 * @reqprot contains the protection requested by the application.
537 * @prot contains the protection that will be applied by the kernel.
538 * Return 0 if permission is granted.
539 * @file_lock:
540 * Check permission before performing file locking operations.
541 * Note: this hook mediates both flock and fcntl style locks.
542 * @file contains the file structure.
543 * @cmd contains the posix-translated lock operation to perform
544 * (e.g. F_RDLCK, F_WRLCK).
545 * Return 0 if permission is granted.
546 * @file_fcntl:
547 * Check permission before allowing the file operation specified by @cmd
548 * from being performed on the file @file. Note that @arg can sometimes
549 * represents a user space pointer; in other cases, it may be a simple
550 * integer value. When @arg represents a user space pointer, it should
551 * never be used by the security module.
552 * @file contains the file structure.
553 * @cmd contains the operation to be performed.
554 * @arg contains the operational arguments.
555 * Return 0 if permission is granted.
556 * @file_set_fowner:
557 * Save owner security information (typically from current->security) in
558 * file->f_security for later use by the send_sigiotask hook.
559 * @file contains the file structure to update.
560 * Return 0 on success.
561 * @file_send_sigiotask:
562 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
563 * process @tsk. Note that this hook is sometimes called from interrupt.
564 * Note that the fown_struct, @fown, is never outside the context of a
565 * struct file, so the file structure (and associated security information)
566 * can always be obtained:
567 * container_of(fown, struct file, f_owner)
568 * @tsk contains the structure of task receiving signal.
569 * @fown contains the file owner information.
570 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
571 * Return 0 if permission is granted.
572 * @file_receive:
573 * This hook allows security modules to control the ability of a process
574 * to receive an open file descriptor via socket IPC.
575 * @file contains the file structure being received.
576 * Return 0 if permission is granted.
577 *
578 * Security hook for dentry
579 *
580 * @dentry_open
581 * Save open-time permission checking state for later use upon
582 * file_permission, and recheck access if anything has changed
583 * since inode_permission.
584 *
585 * Security hooks for task operations.
586 *
587 * @task_create:
588 * Check permission before creating a child process. See the clone(2)
589 * manual page for definitions of the @clone_flags.
590 * @clone_flags contains the flags indicating what should be shared.
591 * Return 0 if permission is granted.
592 * @task_alloc_security:
593 * @p contains the task_struct for child process.
594 * Allocate and attach a security structure to the p->security field. The
595 * security field is initialized to NULL when the task structure is
596 * allocated.
597 * Return 0 if operation was successful.
598 * @task_free_security:
599 * @p contains the task_struct for process.
600 * Deallocate and clear the p->security field.
601 * @task_setuid:
602 * Check permission before setting one or more of the user identity
603 * attributes of the current process. The @flags parameter indicates
604 * which of the set*uid system calls invoked this hook and how to
605 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
606 * definitions at the beginning of this file for the @flags values and
607 * their meanings.
608 * @id0 contains a uid.
609 * @id1 contains a uid.
610 * @id2 contains a uid.
611 * @flags contains one of the LSM_SETID_* values.
612 * Return 0 if permission is granted.
613 * @task_post_setuid:
614 * Update the module's state after setting one or more of the user
615 * identity attributes of the current process. The @flags parameter
616 * indicates which of the set*uid system calls invoked this hook. If
617 * @flags is LSM_SETID_FS, then @old_ruid is the old fs uid and the other
618 * parameters are not used.
619 * @old_ruid contains the old real uid (or fs uid if LSM_SETID_FS).
620 * @old_euid contains the old effective uid (or -1 if LSM_SETID_FS).
621 * @old_suid contains the old saved uid (or -1 if LSM_SETID_FS).
622 * @flags contains one of the LSM_SETID_* values.
623 * Return 0 on success.
624 * @task_setgid:
625 * Check permission before setting one or more of the group identity
626 * attributes of the current process. The @flags parameter indicates
627 * which of the set*gid system calls invoked this hook and how to
628 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
629 * definitions at the beginning of this file for the @flags values and
630 * their meanings.
631 * @id0 contains a gid.
632 * @id1 contains a gid.
633 * @id2 contains a gid.
634 * @flags contains one of the LSM_SETID_* values.
635 * Return 0 if permission is granted.
636 * @task_setpgid:
637 * Check permission before setting the process group identifier of the
638 * process @p to @pgid.
639 * @p contains the task_struct for process being modified.
640 * @pgid contains the new pgid.
641 * Return 0 if permission is granted.
642 * @task_getpgid:
643 * Check permission before getting the process group identifier of the
644 * process @p.
645 * @p contains the task_struct for the process.
646 * Return 0 if permission is granted.
647 * @task_getsid:
648 * Check permission before getting the session identifier of the process
649 * @p.
650 * @p contains the task_struct for the process.
651 * Return 0 if permission is granted.
652 * @task_getsecid:
653 * Retrieve the security identifier of the process @p.
654 * @p contains the task_struct for the process and place is into @secid.
655 * In case of failure, @secid will be set to zero.
656 *
657 * @task_setgroups:
658 * Check permission before setting the supplementary group set of the
659 * current process.
660 * @group_info contains the new group information.
661 * Return 0 if permission is granted.
662 * @task_setnice:
663 * Check permission before setting the nice value of @p to @nice.
664 * @p contains the task_struct of process.
665 * @nice contains the new nice value.
666 * Return 0 if permission is granted.
667 * @task_setioprio
668 * Check permission before setting the ioprio value of @p to @ioprio.
669 * @p contains the task_struct of process.
670 * @ioprio contains the new ioprio value
671 * Return 0 if permission is granted.
672 * @task_getioprio
673 * Check permission before getting the ioprio value of @p.
674 * @p contains the task_struct of process.
675 * Return 0 if permission is granted.
676 * @task_setrlimit:
677 * Check permission before setting the resource limits of the current
678 * process for @resource to @new_rlim. The old resource limit values can
679 * be examined by dereferencing (current->signal->rlim + resource).
680 * @resource contains the resource whose limit is being set.
681 * @new_rlim contains the new limits for @resource.
682 * Return 0 if permission is granted.
683 * @task_setscheduler:
684 * Check permission before setting scheduling policy and/or parameters of
685 * process @p based on @policy and @lp.
686 * @p contains the task_struct for process.
687 * @policy contains the scheduling policy.
688 * @lp contains the scheduling parameters.
689 * Return 0 if permission is granted.
690 * @task_getscheduler:
691 * Check permission before obtaining scheduling information for process
692 * @p.
693 * @p contains the task_struct for process.
694 * Return 0 if permission is granted.
695 * @task_movememory
696 * Check permission before moving memory owned by process @p.
697 * @p contains the task_struct for process.
698 * Return 0 if permission is granted.
699 * @task_kill:
700 * Check permission before sending signal @sig to @p. @info can be NULL,
701 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
702 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
703 * from the kernel and should typically be permitted.
704 * SIGIO signals are handled separately by the send_sigiotask hook in
705 * file_security_ops.
706 * @p contains the task_struct for process.
707 * @info contains the signal information.
708 * @sig contains the signal value.
709 * @secid contains the sid of the process where the signal originated
710 * Return 0 if permission is granted.
711 * @task_wait:
712 * Check permission before allowing a process to reap a child process @p
713 * and collect its status information.
714 * @p contains the task_struct for process.
715 * Return 0 if permission is granted.
716 * @task_prctl:
717 * Check permission before performing a process control operation on the
718 * current process.
719 * @option contains the operation.
720 * @arg2 contains a argument.
721 * @arg3 contains a argument.
722 * @arg4 contains a argument.
723 * @arg5 contains a argument.
724 * @rc_p contains a pointer to communicate back the forced return code
725 * Return 0 if permission is granted, and non-zero if the security module
726 * has taken responsibility (setting *rc_p) for the prctl call.
727 * @task_reparent_to_init:
728 * Set the security attributes in @p->security for a kernel thread that
729 * is being reparented to the init task.
730 * @p contains the task_struct for the kernel thread.
731 * @task_to_inode:
732 * Set the security attributes for an inode based on an associated task's
733 * security attributes, e.g. for /proc/pid inodes.
734 * @p contains the task_struct for the task.
735 * @inode contains the inode structure for the inode.
736 *
737 * Security hooks for Netlink messaging.
738 *
739 * @netlink_send:
740 * Save security information for a netlink message so that permission
741 * checking can be performed when the message is processed. The security
742 * information can be saved using the eff_cap field of the
743 * netlink_skb_parms structure. Also may be used to provide fine
744 * grained control over message transmission.
745 * @sk associated sock of task sending the message.,
746 * @skb contains the sk_buff structure for the netlink message.
747 * Return 0 if the information was successfully saved and message
748 * is allowed to be transmitted.
749 * @netlink_recv:
750 * Check permission before processing the received netlink message in
751 * @skb.
752 * @skb contains the sk_buff structure for the netlink message.
753 * @cap indicates the capability required
754 * Return 0 if permission is granted.
755 *
756 * Security hooks for Unix domain networking.
757 *
758 * @unix_stream_connect:
759 * Check permissions before establishing a Unix domain stream connection
760 * between @sock and @other.
761 * @sock contains the socket structure.
762 * @other contains the peer socket structure.
763 * Return 0 if permission is granted.
764 * @unix_may_send:
765 * Check permissions before connecting or sending datagrams from @sock to
766 * @other.
767 * @sock contains the socket structure.
768 * @sock contains the peer socket structure.
769 * Return 0 if permission is granted.
770 *
771 * The @unix_stream_connect and @unix_may_send hooks were necessary because
772 * Linux provides an alternative to the conventional file name space for Unix
773 * domain sockets. Whereas binding and connecting to sockets in the file name
774 * space is mediated by the typical file permissions (and caught by the mknod
775 * and permission hooks in inode_security_ops), binding and connecting to
776 * sockets in the abstract name space is completely unmediated. Sufficient
777 * control of Unix domain sockets in the abstract name space isn't possible
778 * using only the socket layer hooks, since we need to know the actual target
779 * socket, which is not looked up until we are inside the af_unix code.
780 *
781 * Security hooks for socket operations.
782 *
783 * @socket_create:
784 * Check permissions prior to creating a new socket.
785 * @family contains the requested protocol family.
786 * @type contains the requested communications type.
787 * @protocol contains the requested protocol.
788 * @kern set to 1 if a kernel socket.
789 * Return 0 if permission is granted.
790 * @socket_post_create:
791 * This hook allows a module to update or allocate a per-socket security
792 * structure. Note that the security field was not added directly to the
793 * socket structure, but rather, the socket security information is stored
794 * in the associated inode. Typically, the inode alloc_security hook will
795 * allocate and and attach security information to
796 * sock->inode->i_security. This hook may be used to update the
797 * sock->inode->i_security field with additional information that wasn't
798 * available when the inode was allocated.
799 * @sock contains the newly created socket structure.
800 * @family contains the requested protocol family.
801 * @type contains the requested communications type.
802 * @protocol contains the requested protocol.
803 * @kern set to 1 if a kernel socket.
804 * @socket_bind:
805 * Check permission before socket protocol layer bind operation is
806 * performed and the socket @sock is bound to the address specified in the
807 * @address parameter.
808 * @sock contains the socket structure.
809 * @address contains the address to bind to.
810 * @addrlen contains the length of address.
811 * Return 0 if permission is granted.
812 * @socket_connect:
813 * Check permission before socket protocol layer connect operation
814 * attempts to connect socket @sock to a remote address, @address.
815 * @sock contains the socket structure.
816 * @address contains the address of remote endpoint.
817 * @addrlen contains the length of address.
818 * Return 0 if permission is granted.
819 * @socket_listen:
820 * Check permission before socket protocol layer listen operation.
821 * @sock contains the socket structure.
822 * @backlog contains the maximum length for the pending connection queue.
823 * Return 0 if permission is granted.
824 * @socket_accept:
825 * Check permission before accepting a new connection. Note that the new
826 * socket, @newsock, has been created and some information copied to it,
827 * but the accept operation has not actually been performed.
828 * @sock contains the listening socket structure.
829 * @newsock contains the newly created server socket for connection.
830 * Return 0 if permission is granted.
831 * @socket_post_accept:
832 * This hook allows a security module to copy security
833 * information into the newly created socket's inode.
834 * @sock contains the listening socket structure.
835 * @newsock contains the newly created server socket for connection.
836 * @socket_sendmsg:
837 * Check permission before transmitting a message to another socket.
838 * @sock contains the socket structure.
839 * @msg contains the message to be transmitted.
840 * @size contains the size of message.
841 * Return 0 if permission is granted.
842 * @socket_recvmsg:
843 * Check permission before receiving a message from a socket.
844 * @sock contains the socket structure.
845 * @msg contains the message structure.
846 * @size contains the size of message structure.
847 * @flags contains the operational flags.
848 * Return 0 if permission is granted.
849 * @socket_getsockname:
850 * Check permission before the local address (name) of the socket object
851 * @sock is retrieved.
852 * @sock contains the socket structure.
853 * Return 0 if permission is granted.
854 * @socket_getpeername:
855 * Check permission before the remote address (name) of a socket object
856 * @sock is retrieved.
857 * @sock contains the socket structure.
858 * Return 0 if permission is granted.
859 * @socket_getsockopt:
860 * Check permissions before retrieving the options associated with socket
861 * @sock.
862 * @sock contains the socket structure.
863 * @level contains the protocol level to retrieve option from.
864 * @optname contains the name of option to retrieve.
865 * Return 0 if permission is granted.
866 * @socket_setsockopt:
867 * Check permissions before setting the options associated with socket
868 * @sock.
869 * @sock contains the socket structure.
870 * @level contains the protocol level to set options for.
871 * @optname contains the name of the option to set.
872 * Return 0 if permission is granted.
873 * @socket_shutdown:
874 * Checks permission before all or part of a connection on the socket
875 * @sock is shut down.
876 * @sock contains the socket structure.
877 * @how contains the flag indicating how future sends and receives are handled.
878 * Return 0 if permission is granted.
879 * @socket_sock_rcv_skb:
880 * Check permissions on incoming network packets. This hook is distinct
881 * from Netfilter's IP input hooks since it is the first time that the
882 * incoming sk_buff @skb has been associated with a particular socket, @sk.
883 * @sk contains the sock (not socket) associated with the incoming sk_buff.
884 * @skb contains the incoming network data.
885 * @socket_getpeersec_stream:
886 * This hook allows the security module to provide peer socket security
887 * state for unix or connected tcp sockets to userspace via getsockopt
888 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
889 * socket is associated with an ipsec SA.
890 * @sock is the local socket.
891 * @optval userspace memory where the security state is to be copied.
892 * @optlen userspace int where the module should copy the actual length
893 * of the security state.
894 * @len as input is the maximum length to copy to userspace provided
895 * by the caller.
896 * Return 0 if all is well, otherwise, typical getsockopt return
897 * values.
898 * @socket_getpeersec_dgram:
899 * This hook allows the security module to provide peer socket security
900 * state for udp sockets on a per-packet basis to userspace via
901 * getsockopt SO_GETPEERSEC. The application must first have indicated
902 * the IP_PASSSEC option via getsockopt. It can then retrieve the
903 * security state returned by this hook for a packet via the SCM_SECURITY
904 * ancillary message type.
905 * @skb is the skbuff for the packet being queried
906 * @secdata is a pointer to a buffer in which to copy the security data
907 * @seclen is the maximum length for @secdata
908 * Return 0 on success, error on failure.
909 * @sk_alloc_security:
910 * Allocate and attach a security structure to the sk->sk_security field,
911 * which is used to copy security attributes between local stream sockets.
912 * @sk_free_security:
913 * Deallocate security structure.
914 * @sk_clone_security:
915 * Clone/copy security structure.
916 * @sk_getsecid:
917 * Retrieve the LSM-specific secid for the sock to enable caching of network
918 * authorizations.
919 * @sock_graft:
920 * Sets the socket's isec sid to the sock's sid.
921 * @inet_conn_request:
922 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
923 * @inet_csk_clone:
924 * Sets the new child socket's sid to the openreq sid.
925 * @inet_conn_established:
926 * Sets the connection's peersid to the secmark on skb.
927 * @req_classify_flow:
928 * Sets the flow's sid to the openreq sid.
929 *
930 * Security hooks for XFRM operations.
931 *
932 * @xfrm_policy_alloc_security:
933 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
934 * Database used by the XFRM system.
935 * @sec_ctx contains the security context information being provided by
936 * the user-level policy update program (e.g., setkey).
937 * Allocate a security structure to the xp->security field; the security
938 * field is initialized to NULL when the xfrm_policy is allocated.
939 * Return 0 if operation was successful (memory to allocate, legal context)
940 * @xfrm_policy_clone_security:
941 * @old_ctx contains an existing xfrm_sec_ctx.
942 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
943 * Allocate a security structure in new_ctxp that contains the
944 * information from the old_ctx structure.
945 * Return 0 if operation was successful (memory to allocate).
946 * @xfrm_policy_free_security:
947 * @ctx contains the xfrm_sec_ctx
948 * Deallocate xp->security.
949 * @xfrm_policy_delete_security:
950 * @ctx contains the xfrm_sec_ctx.
951 * Authorize deletion of xp->security.
952 * @xfrm_state_alloc_security:
953 * @x contains the xfrm_state being added to the Security Association
954 * Database by the XFRM system.
955 * @sec_ctx contains the security context information being provided by
956 * the user-level SA generation program (e.g., setkey or racoon).
957 * @secid contains the secid from which to take the mls portion of the context.
958 * Allocate a security structure to the x->security field; the security
959 * field is initialized to NULL when the xfrm_state is allocated. Set the
960 * context to correspond to either sec_ctx or polsec, with the mls portion
961 * taken from secid in the latter case.
962 * Return 0 if operation was successful (memory to allocate, legal context).
963 * @xfrm_state_free_security:
964 * @x contains the xfrm_state.
965 * Deallocate x->security.
966 * @xfrm_state_delete_security:
967 * @x contains the xfrm_state.
968 * Authorize deletion of x->security.
969 * @xfrm_policy_lookup:
970 * @ctx contains the xfrm_sec_ctx for which the access control is being
971 * checked.
972 * @fl_secid contains the flow security label that is used to authorize
973 * access to the policy xp.
974 * @dir contains the direction of the flow (input or output).
975 * Check permission when a flow selects a xfrm_policy for processing
976 * XFRMs on a packet. The hook is called when selecting either a
977 * per-socket policy or a generic xfrm policy.
978 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
979 * on other errors.
980 * @xfrm_state_pol_flow_match:
981 * @x contains the state to match.
982 * @xp contains the policy to check for a match.
983 * @fl contains the flow to check for a match.
984 * Return 1 if there is a match.
985 * @xfrm_decode_session:
986 * @skb points to skb to decode.
987 * @secid points to the flow key secid to set.
988 * @ckall says if all xfrms used should be checked for same secid.
989 * Return 0 if ckall is zero or all xfrms used have the same secid.
990 *
991 * Security hooks affecting all Key Management operations
992 *
993 * @key_alloc:
994 * Permit allocation of a key and assign security data. Note that key does
995 * not have a serial number assigned at this point.
996 * @key points to the key.
997 * @flags is the allocation flags
998 * Return 0 if permission is granted, -ve error otherwise.
999 * @key_free:
1000 * Notification of destruction; free security data.
1001 * @key points to the key.
1002 * No return value.
1003 * @key_permission:
1004 * See whether a specific operational right is granted to a process on a
1005 * key.
1006 * @key_ref refers to the key (key pointer + possession attribute bit).
1007 * @context points to the process to provide the context against which to
1008 * evaluate the security data on the key.
1009 * @perm describes the combination of permissions required of this key.
1010 * Return 1 if permission granted, 0 if permission denied and -ve it the
1011 * normal permissions model should be effected.
1012 * @key_getsecurity:
1013 * Get a textual representation of the security context attached to a key
1014 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1015 * allocates the storage for the NUL-terminated string and the caller
1016 * should free it.
1017 * @key points to the key to be queried.
1018 * @_buffer points to a pointer that should be set to point to the
1019 * resulting string (if no label or an error occurs).
1020 * Return the length of the string (including terminating NUL) or -ve if
1021 * an error.
1022 * May also return 0 (and a NULL buffer pointer) if there is no label.
1023 *
1024 * Security hooks affecting all System V IPC operations.
1025 *
1026 * @ipc_permission:
1027 * Check permissions for access to IPC
1028 * @ipcp contains the kernel IPC permission structure
1029 * @flag contains the desired (requested) permission set
1030 * Return 0 if permission is granted.
1031 * @ipc_getsecid:
1032 * Get the secid associated with the ipc object.
1033 * @ipcp contains the kernel IPC permission structure.
1034 * @secid contains a pointer to the location where result will be saved.
1035 * In case of failure, @secid will be set to zero.
1036 *
1037 * Security hooks for individual messages held in System V IPC message queues
1038 * @msg_msg_alloc_security:
1039 * Allocate and attach a security structure to the msg->security field.
1040 * The security field is initialized to NULL when the structure is first
1041 * created.
1042 * @msg contains the message structure to be modified.
1043 * Return 0 if operation was successful and permission is granted.
1044 * @msg_msg_free_security:
1045 * Deallocate the security structure for this message.
1046 * @msg contains the message structure to be modified.
1047 *
1048 * Security hooks for System V IPC Message Queues
1049 *
1050 * @msg_queue_alloc_security:
1051 * Allocate and attach a security structure to the
1052 * msq->q_perm.security field. The security field is initialized to
1053 * NULL when the structure is first created.
1054 * @msq contains the message queue structure to be modified.
1055 * Return 0 if operation was successful and permission is granted.
1056 * @msg_queue_free_security:
1057 * Deallocate security structure for this message queue.
1058 * @msq contains the message queue structure to be modified.
1059 * @msg_queue_associate:
1060 * Check permission when a message queue is requested through the
1061 * msgget system call. This hook is only called when returning the
1062 * message queue identifier for an existing message queue, not when a
1063 * new message queue is created.
1064 * @msq contains the message queue to act upon.
1065 * @msqflg contains the operation control flags.
1066 * Return 0 if permission is granted.
1067 * @msg_queue_msgctl:
1068 * Check permission when a message control operation specified by @cmd
1069 * is to be performed on the message queue @msq.
1070 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1071 * @msq contains the message queue to act upon. May be NULL.
1072 * @cmd contains the operation to be performed.
1073 * Return 0 if permission is granted.
1074 * @msg_queue_msgsnd:
1075 * Check permission before a message, @msg, is enqueued on the message
1076 * queue, @msq.
1077 * @msq contains the message queue to send message to.
1078 * @msg contains the message to be enqueued.
1079 * @msqflg contains operational flags.
1080 * Return 0 if permission is granted.
1081 * @msg_queue_msgrcv:
1082 * Check permission before a message, @msg, is removed from the message
1083 * queue, @msq. The @target task structure contains a pointer to the
1084 * process that will be receiving the message (not equal to the current
1085 * process when inline receives are being performed).
1086 * @msq contains the message queue to retrieve message from.
1087 * @msg contains the message destination.
1088 * @target contains the task structure for recipient process.
1089 * @type contains the type of message requested.
1090 * @mode contains the operational flags.
1091 * Return 0 if permission is granted.
1092 *
1093 * Security hooks for System V Shared Memory Segments
1094 *
1095 * @shm_alloc_security:
1096 * Allocate and attach a security structure to the shp->shm_perm.security
1097 * field. The security field is initialized to NULL when the structure is
1098 * first created.
1099 * @shp contains the shared memory structure to be modified.
1100 * Return 0 if operation was successful and permission is granted.
1101 * @shm_free_security:
1102 * Deallocate the security struct for this memory segment.
1103 * @shp contains the shared memory structure to be modified.
1104 * @shm_associate:
1105 * Check permission when a shared memory region is requested through the
1106 * shmget system call. This hook is only called when returning the shared
1107 * memory region identifier for an existing region, not when a new shared
1108 * memory region is created.
1109 * @shp contains the shared memory structure to be modified.
1110 * @shmflg contains the operation control flags.
1111 * Return 0 if permission is granted.
1112 * @shm_shmctl:
1113 * Check permission when a shared memory control operation specified by
1114 * @cmd is to be performed on the shared memory region @shp.
1115 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1116 * @shp contains shared memory structure to be modified.
1117 * @cmd contains the operation to be performed.
1118 * Return 0 if permission is granted.
1119 * @shm_shmat:
1120 * Check permissions prior to allowing the shmat system call to attach the
1121 * shared memory segment @shp to the data segment of the calling process.
1122 * The attaching address is specified by @shmaddr.
1123 * @shp contains the shared memory structure to be modified.
1124 * @shmaddr contains the address to attach memory region to.
1125 * @shmflg contains the operational flags.
1126 * Return 0 if permission is granted.
1127 *
1128 * Security hooks for System V Semaphores
1129 *
1130 * @sem_alloc_security:
1131 * Allocate and attach a security structure to the sma->sem_perm.security
1132 * field. The security field is initialized to NULL when the structure is
1133 * first created.
1134 * @sma contains the semaphore structure
1135 * Return 0 if operation was successful and permission is granted.
1136 * @sem_free_security:
1137 * deallocate security struct for this semaphore
1138 * @sma contains the semaphore structure.
1139 * @sem_associate:
1140 * Check permission when a semaphore is requested through the semget
1141 * system call. This hook is only called when returning the semaphore
1142 * identifier for an existing semaphore, not when a new one must be
1143 * created.
1144 * @sma contains the semaphore structure.
1145 * @semflg contains the operation control flags.
1146 * Return 0 if permission is granted.
1147 * @sem_semctl:
1148 * Check permission when a semaphore operation specified by @cmd is to be
1149 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1150 * IPC_INFO or SEM_INFO.
1151 * @sma contains the semaphore structure. May be NULL.
1152 * @cmd contains the operation to be performed.
1153 * Return 0 if permission is granted.
1154 * @sem_semop
1155 * Check permissions before performing operations on members of the
1156 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1157 * may be modified.
1158 * @sma contains the semaphore structure.
1159 * @sops contains the operations to perform.
1160 * @nsops contains the number of operations to perform.
1161 * @alter contains the flag indicating whether changes are to be made.
1162 * Return 0 if permission is granted.
1163 *
1164 * @ptrace:
1165 * Check permission before allowing the @parent process to trace the
1166 * @child process.
1167 * Security modules may also want to perform a process tracing check
1168 * during an execve in the set_security or apply_creds hooks of
1169 * binprm_security_ops if the process is being traced and its security
1170 * attributes would be changed by the execve.
1171 * @parent contains the task_struct structure for parent process.
1172 * @child contains the task_struct structure for child process.
1173 * Return 0 if permission is granted.
1174 * @capget:
1175 * Get the @effective, @inheritable, and @permitted capability sets for
1176 * the @target process. The hook may also perform permission checking to
1177 * determine if the current process is allowed to see the capability sets
1178 * of the @target process.
1179 * @target contains the task_struct structure for target process.
1180 * @effective contains the effective capability set.
1181 * @inheritable contains the inheritable capability set.
1182 * @permitted contains the permitted capability set.
1183 * Return 0 if the capability sets were successfully obtained.
1184 * @capset_check:
1185 * Check permission before setting the @effective, @inheritable, and
1186 * @permitted capability sets for the @target process.
1187 * Caveat: @target is also set to current if a set of processes is
1188 * specified (i.e. all processes other than current and init or a
1189 * particular process group). Hence, the capset_set hook may need to
1190 * revalidate permission to the actual target process.
1191 * @target contains the task_struct structure for target process.
1192 * @effective contains the effective capability set.
1193 * @inheritable contains the inheritable capability set.
1194 * @permitted contains the permitted capability set.
1195 * Return 0 if permission is granted.
1196 * @capset_set:
1197 * Set the @effective, @inheritable, and @permitted capability sets for
1198 * the @target process. Since capset_check cannot always check permission
1199 * to the real @target process, this hook may also perform permission
1200 * checking to determine if the current process is allowed to set the
1201 * capability sets of the @target process. However, this hook has no way
1202 * of returning an error due to the structure of the sys_capset code.
1203 * @target contains the task_struct structure for target process.
1204 * @effective contains the effective capability set.
1205 * @inheritable contains the inheritable capability set.
1206 * @permitted contains the permitted capability set.
1207 * @capable:
1208 * Check whether the @tsk process has the @cap capability.
1209 * @tsk contains the task_struct for the process.
1210 * @cap contains the capability <include/linux/capability.h>.
1211 * Return 0 if the capability is granted for @tsk.
1212 * @acct:
1213 * Check permission before enabling or disabling process accounting. If
1214 * accounting is being enabled, then @file refers to the open file used to
1215 * store accounting records. If accounting is being disabled, then @file
1216 * is NULL.
1217 * @file contains the file structure for the accounting file (may be NULL).
1218 * Return 0 if permission is granted.
1219 * @sysctl:
1220 * Check permission before accessing the @table sysctl variable in the
1221 * manner specified by @op.
1222 * @table contains the ctl_table structure for the sysctl variable.
1223 * @op contains the operation (001 = search, 002 = write, 004 = read).
1224 * Return 0 if permission is granted.
1225 * @syslog:
1226 * Check permission before accessing the kernel message ring or changing
1227 * logging to the console.
1228 * See the syslog(2) manual page for an explanation of the @type values.
1229 * @type contains the type of action.
1230 * Return 0 if permission is granted.
1231 * @settime:
1232 * Check permission to change the system time.
1233 * struct timespec and timezone are defined in include/linux/time.h
1234 * @ts contains new time
1235 * @tz contains new timezone
1236 * Return 0 if permission is granted.
1237 * @vm_enough_memory:
1238 * Check permissions for allocating a new virtual mapping.
1239 * @mm contains the mm struct it is being added to.
1240 * @pages contains the number of pages.
1241 * Return 0 if permission is granted.
1242 *
1243 * @register_security:
1244 * allow module stacking.
1245 * @name contains the name of the security module being stacked.
1246 * @ops contains a pointer to the struct security_operations of the module to stack.
1247 *
1248 * @secid_to_secctx:
1249 * Convert secid to security context.
1250 * @secid contains the security ID.
1251 * @secdata contains the pointer that stores the converted security context.
1252 * @secctx_to_secid:
1253 * Convert security context to secid.
1254 * @secid contains the pointer to the generated security ID.
1255 * @secdata contains the security context.
1256 *
1257 * @release_secctx:
1258 * Release the security context.
1259 * @secdata contains the security context.
1260 * @seclen contains the length of the security context.
1261 *
1262 * Security hooks for Audit
1263 *
1264 * @audit_rule_init:
1265 * Allocate and initialize an LSM audit rule structure.
1266 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1267 * @op contains the operator the rule uses.
1268 * @rulestr contains the context where the rule will be applied to.
1269 * @lsmrule contains a pointer to receive the result.
1270 * Return 0 if @lsmrule has been successfully set,
1271 * -EINVAL in case of an invalid rule.
1272 *
1273 * @audit_rule_known:
1274 * Specifies whether given @rule contains any fields related to current LSM.
1275 * @rule contains the audit rule of interest.
1276 * Return 1 in case of relation found, 0 otherwise.
1277 *
1278 * @audit_rule_match:
1279 * Determine if given @secid matches a rule previously approved
1280 * by @audit_rule_known.
1281 * @secid contains the security id in question.
1282 * @field contains the field which relates to current LSM.
1283 * @op contains the operator that will be used for matching.
1284 * @rule points to the audit rule that will be checked against.
1285 * @actx points to the audit context associated with the check.
1286 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1287 *
1288 * @audit_rule_free:
1289 * Deallocate the LSM audit rule structure previously allocated by
1290 * audit_rule_init.
1291 * @rule contains the allocated rule
1292 *
1293 * This is the main security structure.
1294 */
1386 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1387 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1475 /* allow module stacking */
1487 #ifdef CONFIG_SECURITY_NETWORK
1513 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1527 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1530 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1535 u32 secid);
1545 /* key management security hooks */
1546 #ifdef CONFIG_KEYS
1551 key_perm_t perm);
1555 #ifdef CONFIG_AUDIT
1562 };
1564 /* prototypes */
1575 /* Security operations */
1657 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1658 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1738 };
1741 {
1742 }
1745 {
1746 }
1748 /*
1749 * This is the default capabilities functionality. Most of these functions
1750 * are just stubbed out, but a few must call the proper capable code.
1751 */
1754 {
1756 }
1759 {
1761 }
1767 {
1769 }
1775 {
1777 }
1783 {
1785 }
1788 {
1790 }
1793 {
1795 }
1798 {
1800 }
1804 {
1806 }
1809 {
1811 }
1814 {
1816 }
1819 {
1821 }
1824 {
1826 }
1829 {
1831 }
1834 {
1836 }
1839 { }
1842 {
1844 }
1847 {
1849 }
1852 {
1854 }
1857 {
1859 }
1862 {
1864 }
1867 {
1869 }
1872 { }
1875 {
1877 }
1880 {
1882 }
1885 {
1887 }
1892 {
1894 }
1898 {
1900 }
1903 {
1905 }
1908 { }
1911 { }
1915 { }
1919 { }
1923 {
1925 }
1929 { }
1932 {
1935 }
1939 {
1941 }
1945 { }
1948 {
1950 }
1953 {
1955 }
1958 { }
1965 {
1967 }
1972 {
1974 }
1979 {
1981 }
1985 {
1987 }
1992 {
1994 }
1999 {
2001 }
2005 {
2007 }
2012 {
2014 }
2020 {
2022 }
2025 {
2027 }
2031 {
2033 }
2037 {
2039 }
2043 {
2045 }
2049 {
2051 }
2054 { }
2058 {
2060 }
2064 { }
2068 {
2070 }
2073 {
2075 }
2079 {
2081 }
2084 {
2086 }
2089 {
2091 }
2093 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2094 {
2096 }
2098 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2099 {
2101 }
2103 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2104 {
2106 }
2109 {
2111 }
2114 {
2116 }
2119 {
2121 }
2124 { }
2128 {
2130 }
2137 {
2139 }
2144 {
2146 }
2149 {
2151 }
2155 {
2157 }
2160 {
2162 }
2167 {
2169 }
2172 {
2174 }
2177 {
2179 }
2182 {
2184 }
2187 {
2189 }
2192 { }
2196 {
2198 }
2202 {
2204 }
2208 {
2210 }
2213 {
2215 }
2218 {
2220 }
2223 {
2225 }
2228 {
2230 }
2233 {
2235 }
2238 {
2240 }
2243 {
2245 }
2248 {
2250 }
2254 {
2256 }
2261 {
2263 }
2266 {
2268 }
2271 {
2273 }
2277 u32 secid)
2278 {
2280 }
2283 {
2285 }
2291 {
2293 }
2296 {
2298 }
2301 { }
2305 {
2307 }
2310 {
2312 }
2315 {
2317 }
2320 { }
2323 {
2325 }
2328 { }
2332 {
2334 }
2337 {
2339 }
2343 {
2345 }
2351 {
2353 }
2356 {
2358 }
2361 { }
2365 {
2367 }
2370 {
2372 }
2376 {
2378 }
2381 {
2383 }
2386 { }
2389 {
2391 }
2394 {
2396 }
2401 {
2403 }
2406 { }
2409 {
2411 }
2413 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2414 {
2416 }
2419 {
2421 }
2424 {
2426 }
2430 {
2432 }
2435 mode_t mode,
2439 {
2441 }
2444 {
2445 }
2448 {
2450 }
2453 u32 seclen,
2455 {
2457 }
2460 {
2461 }
2464 #ifdef CONFIG_SECURITY_NETWORK
2506 {
2508 }
2512 {
2514 }
2518 {
2520 }
2526 {
2528 }
2533 {
2535 }
2540 {
2542 }
2545 {
2547 }
2551 {
2553 }
2557 {
2558 }
2562 {
2564 }
2569 {
2571 }
2574 {
2576 }
2579 {
2581 }
2585 {
2587 }
2591 {
2593 }
2596 {
2598 }
2601 {
2603 }
2607 {
2609 }
2611 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2612 {
2614 }
2617 {
2619 }
2622 {
2623 }
2626 {
2627 }
2630 {
2631 }
2633 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2634 {
2635 }
2638 {
2639 }
2643 {
2645 }
2649 {
2650 }
2654 {
2655 }
2658 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2677 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2678 {
2680 }
2682 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2683 {
2685 }
2688 {
2689 }
2692 {
2694 }
2698 {
2700 }
2704 {
2706 }
2709 {
2710 }
2713 {
2715 }
2718 {
2720 }
2724 {
2726 }
2729 {
2731 }
2734 {
2735 }
2739 #ifdef CONFIG_KEYS
2740 #ifdef CONFIG_SECURITY
2748 #else
2753 {
2755 }
2758 {
2759 }
2763 key_perm_t perm)
2764 {
2766 }
2769 {
2772 }
2774 #endif
2777 #ifdef CONFIG_AUDIT
2778 #ifdef CONFIG_SECURITY
2785 #else
2789 {
2791 }
2794 {
2796 }
2800 {
2802 }
2805 { }