| blob | e3d4ecda267381d85da5697b2ad681c1da749fe3 |
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 */
51 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
52 extern int cap_capset_check(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
53 extern void cap_capset_set(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
89 /*
90 * Values used in the task_security_ops calls
91 */
92 /* setuid or setgid, id0 == uid or gid */
93 #define LSM_SETID_ID 1
95 /* setreuid or setregid, id0 == real, id1 == eff */
96 #define LSM_SETID_RE 2
98 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
99 #define LSM_SETID_RES 4
101 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
102 #define LSM_SETID_FS 8
104 /* 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_set_mnt_opts:
293 * Set the security relevant mount options used for a superblock
294 * @sb the superblock to set security mount options for
295 * @opts binary data structure containing all lsm mount data
296 * @sb_clone_mnt_opts:
297 * Copy all security options from a given superblock to another
298 * @oldsb old superblock which contain information to clone
299 * @newsb new superblock which needs filled in
300 * @sb_parse_opts_str:
301 * Parse a string of security data filling in the opts structure
302 * @options string containing all mount options known by the LSM
303 * @opts binary data structure usable by the LSM
304 *
305 * Security hooks for inode operations.
306 *
307 * @inode_alloc_security:
308 * Allocate and attach a security structure to @inode->i_security. The
309 * i_security field is initialized to NULL when the inode structure is
310 * allocated.
311 * @inode contains the inode structure.
312 * Return 0 if operation was successful.
313 * @inode_free_security:
314 * @inode contains the inode structure.
315 * Deallocate the inode security structure and set @inode->i_security to
316 * NULL.
317 * @inode_init_security:
318 * Obtain the security attribute name suffix and value to set on a newly
319 * created inode and set up the incore security field for the new inode.
320 * This hook is called by the fs code as part of the inode creation
321 * transaction and provides for atomic labeling of the inode, unlike
322 * the post_create/mkdir/... hooks called by the VFS. The hook function
323 * is expected to allocate the name and value via kmalloc, with the caller
324 * being responsible for calling kfree after using them.
325 * If the security module does not use security attributes or does
326 * not wish to put a security attribute on this particular inode,
327 * then it should return -EOPNOTSUPP to skip this processing.
328 * @inode contains the inode structure of the newly created inode.
329 * @dir contains the inode structure of the parent directory.
330 * @name will be set to the allocated name suffix (e.g. selinux).
331 * @value will be set to the allocated attribute value.
332 * @len will be set to the length of the value.
333 * Returns 0 if @name and @value have been successfully set,
334 * -EOPNOTSUPP if no security attribute is needed, or
335 * -ENOMEM on memory allocation failure.
336 * @inode_create:
337 * Check permission to create a regular file.
338 * @dir contains inode structure of the parent of the new file.
339 * @dentry contains the dentry structure for the file to be created.
340 * @mode contains the file mode of the file to be created.
341 * Return 0 if permission is granted.
342 * @inode_link:
343 * Check permission before creating a new hard link to a file.
344 * @old_dentry contains the dentry structure for an existing link to the file.
345 * @dir contains the inode structure of the parent directory of the new link.
346 * @new_dentry contains the dentry structure for the new link.
347 * Return 0 if permission is granted.
348 * @inode_unlink:
349 * Check the permission to remove a hard link to a file.
350 * @dir contains the inode structure of parent directory of the file.
351 * @dentry contains the dentry structure for file to be unlinked.
352 * Return 0 if permission is granted.
353 * @inode_symlink:
354 * Check the permission to create a symbolic link to a file.
355 * @dir contains the inode structure of parent directory of the symbolic link.
356 * @dentry contains the dentry structure of the symbolic link.
357 * @old_name contains the pathname of file.
358 * Return 0 if permission is granted.
359 * @inode_mkdir:
360 * Check permissions to create a new directory in the existing directory
361 * associated with inode strcture @dir.
362 * @dir containst the inode structure of parent of the directory to be created.
363 * @dentry contains the dentry structure of new directory.
364 * @mode contains the mode of new directory.
365 * Return 0 if permission is granted.
366 * @inode_rmdir:
367 * Check the permission to remove a directory.
368 * @dir contains the inode structure of parent of the directory to be removed.
369 * @dentry contains the dentry structure of directory to be removed.
370 * Return 0 if permission is granted.
371 * @inode_mknod:
372 * Check permissions when creating a special file (or a socket or a fifo
373 * file created via the mknod system call). Note that if mknod operation
374 * is being done for a regular file, then the create hook will be called
375 * and not this hook.
376 * @dir contains the inode structure of parent of the new file.
377 * @dentry contains the dentry structure of the new file.
378 * @mode contains the mode of the new file.
379 * @dev contains the device number.
380 * Return 0 if permission is granted.
381 * @inode_rename:
382 * Check for permission to rename a file or directory.
383 * @old_dir contains the inode structure for parent of the old link.
384 * @old_dentry contains the dentry structure of the old link.
385 * @new_dir contains the inode structure for parent of the new link.
386 * @new_dentry contains the dentry structure of the new link.
387 * Return 0 if permission is granted.
388 * @inode_readlink:
389 * Check the permission to read the symbolic link.
390 * @dentry contains the dentry structure for the file link.
391 * Return 0 if permission is granted.
392 * @inode_follow_link:
393 * Check permission to follow a symbolic link when looking up a pathname.
394 * @dentry contains the dentry structure for the link.
395 * @nd contains the nameidata structure for the parent directory.
396 * Return 0 if permission is granted.
397 * @inode_permission:
398 * Check permission before accessing an inode. This hook is called by the
399 * existing Linux permission function, so a security module can use it to
400 * provide additional checking for existing Linux permission checks.
401 * Notice that this hook is called when a file is opened (as well as many
402 * other operations), whereas the file_security_ops permission hook is
403 * called when the actual read/write operations are performed.
404 * @inode contains the inode structure to check.
405 * @mask contains the permission mask.
406 * @nd contains the nameidata (may be NULL).
407 * Return 0 if permission is granted.
408 * @inode_setattr:
409 * Check permission before setting file attributes. Note that the kernel
410 * call to notify_change is performed from several locations, whenever
411 * file attributes change (such as when a file is truncated, chown/chmod
412 * operations, transferring disk quotas, etc).
413 * @dentry contains the dentry structure for the file.
414 * @attr is the iattr structure containing the new file attributes.
415 * Return 0 if permission is granted.
416 * @inode_getattr:
417 * Check permission before obtaining file attributes.
418 * @mnt is the vfsmount where the dentry was looked up
419 * @dentry contains the dentry structure for the file.
420 * Return 0 if permission is granted.
421 * @inode_delete:
422 * @inode contains the inode structure for deleted inode.
423 * This hook is called when a deleted inode is released (i.e. an inode
424 * with no hard links has its use count drop to zero). A security module
425 * can use this hook to release any persistent label associated with the
426 * inode.
427 * @inode_setxattr:
428 * Check permission before setting the extended attributes
429 * @value identified by @name for @dentry.
430 * Return 0 if permission is granted.
431 * @inode_post_setxattr:
432 * Update inode security field after successful setxattr operation.
433 * @value identified by @name for @dentry.
434 * @inode_getxattr:
435 * Check permission before obtaining the extended attributes
436 * identified by @name for @dentry.
437 * Return 0 if permission is granted.
438 * @inode_listxattr:
439 * Check permission before obtaining the list of extended attribute
440 * names for @dentry.
441 * Return 0 if permission is granted.
442 * @inode_removexattr:
443 * Check permission before removing the extended attribute
444 * identified by @name for @dentry.
445 * Return 0 if permission is granted.
446 * @inode_getsecurity:
447 * Retrieve a copy of the extended attribute representation of the
448 * security label associated with @name for @inode via @buffer. Note that
449 * @name is the remainder of the attribute name after the security prefix
450 * has been removed. @alloc is used to specify of the call should return a
451 * value via the buffer or just the value length Return size of buffer on
452 * success.
453 * @inode_setsecurity:
454 * Set the security label associated with @name for @inode from the
455 * extended attribute value @value. @size indicates the size of the
456 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
457 * Note that @name is the remainder of the attribute name after the
458 * security. prefix has been removed.
459 * Return 0 on success.
460 * @inode_listsecurity:
461 * Copy the extended attribute names for the security labels
462 * associated with @inode into @buffer. The maximum size of @buffer
463 * is specified by @buffer_size. @buffer may be NULL to request
464 * the size of the buffer required.
465 * Returns number of bytes used/required on success.
466 * @inode_need_killpriv:
467 * Called when an inode has been changed.
468 * @dentry is the dentry being changed.
469 * Return <0 on error to abort the inode change operation.
470 * Return 0 if inode_killpriv does not need to be called.
471 * Return >0 if inode_killpriv does need to be called.
472 * @inode_killpriv:
473 * The setuid bit is being removed. Remove similar security labels.
474 * Called with the dentry->d_inode->i_mutex held.
475 * @dentry is the dentry being changed.
476 * Return 0 on success. If error is returned, then the operation
477 * causing setuid bit removal is failed.
478 * @inode_getsecid:
479 * Get the secid associated with the node.
480 * @inode contains a pointer to the inode.
481 * @secid contains a pointer to the location where result will be saved.
482 * In case of failure, @secid will be set to zero.
483 *
484 * Security hooks for file operations
485 *
486 * @file_permission:
487 * Check file permissions before accessing an open file. This hook is
488 * called by various operations that read or write files. A security
489 * module can use this hook to perform additional checking on these
490 * operations, e.g. to revalidate permissions on use to support privilege
491 * bracketing or policy changes. Notice that this hook is used when the
492 * actual read/write operations are performed, whereas the
493 * inode_security_ops hook is called when a file is opened (as well as
494 * many other operations).
495 * Caveat: Although this hook can be used to revalidate permissions for
496 * various system call operations that read or write files, it does not
497 * address the revalidation of permissions for memory-mapped files.
498 * Security modules must handle this separately if they need such
499 * revalidation.
500 * @file contains the file structure being accessed.
501 * @mask contains the requested permissions.
502 * Return 0 if permission is granted.
503 * @file_alloc_security:
504 * Allocate and attach a security structure to the file->f_security field.
505 * The security field is initialized to NULL when the structure is first
506 * created.
507 * @file contains the file structure to secure.
508 * Return 0 if the hook is successful and permission is granted.
509 * @file_free_security:
510 * Deallocate and free any security structures stored in file->f_security.
511 * @file contains the file structure being modified.
512 * @file_ioctl:
513 * @file contains the file structure.
514 * @cmd contains the operation to perform.
515 * @arg contains the operational arguments.
516 * Check permission for an ioctl operation on @file. Note that @arg can
517 * sometimes represents a user space pointer; in other cases, it may be a
518 * simple integer value. When @arg represents a user space pointer, it
519 * should never be used by the security module.
520 * Return 0 if permission is granted.
521 * @file_mmap :
522 * Check permissions for a mmap operation. The @file may be NULL, e.g.
523 * if mapping anonymous memory.
524 * @file contains the file structure for file to map (may be NULL).
525 * @reqprot contains the protection requested by the application.
526 * @prot contains the protection that will be applied by the kernel.
527 * @flags contains the operational flags.
528 * Return 0 if permission is granted.
529 * @file_mprotect:
530 * Check permissions before changing memory access permissions.
531 * @vma contains the memory region to modify.
532 * @reqprot contains the protection requested by the application.
533 * @prot contains the protection that will be applied by the kernel.
534 * Return 0 if permission is granted.
535 * @file_lock:
536 * Check permission before performing file locking operations.
537 * Note: this hook mediates both flock and fcntl style locks.
538 * @file contains the file structure.
539 * @cmd contains the posix-translated lock operation to perform
540 * (e.g. F_RDLCK, F_WRLCK).
541 * Return 0 if permission is granted.
542 * @file_fcntl:
543 * Check permission before allowing the file operation specified by @cmd
544 * from being performed on the file @file. Note that @arg can sometimes
545 * represents a user space pointer; in other cases, it may be a simple
546 * integer value. When @arg represents a user space pointer, it should
547 * never be used by the security module.
548 * @file contains the file structure.
549 * @cmd contains the operation to be performed.
550 * @arg contains the operational arguments.
551 * Return 0 if permission is granted.
552 * @file_set_fowner:
553 * Save owner security information (typically from current->security) in
554 * file->f_security for later use by the send_sigiotask hook.
555 * @file contains the file structure to update.
556 * Return 0 on success.
557 * @file_send_sigiotask:
558 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
559 * process @tsk. Note that this hook is sometimes called from interrupt.
560 * Note that the fown_struct, @fown, is never outside the context of a
561 * struct file, so the file structure (and associated security information)
562 * can always be obtained:
563 * container_of(fown, struct file, f_owner)
564 * @tsk contains the structure of task receiving signal.
565 * @fown contains the file owner information.
566 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
567 * Return 0 if permission is granted.
568 * @file_receive:
569 * This hook allows security modules to control the ability of a process
570 * to receive an open file descriptor via socket IPC.
571 * @file contains the file structure being received.
572 * Return 0 if permission is granted.
573 *
574 * Security hook for dentry
575 *
576 * @dentry_open
577 * Save open-time permission checking state for later use upon
578 * file_permission, and recheck access if anything has changed
579 * since inode_permission.
580 *
581 * Security hooks for task operations.
582 *
583 * @task_create:
584 * Check permission before creating a child process. See the clone(2)
585 * manual page for definitions of the @clone_flags.
586 * @clone_flags contains the flags indicating what should be shared.
587 * Return 0 if permission is granted.
588 * @task_alloc_security:
589 * @p contains the task_struct for child process.
590 * Allocate and attach a security structure to the p->security field. The
591 * security field is initialized to NULL when the task structure is
592 * allocated.
593 * Return 0 if operation was successful.
594 * @task_free_security:
595 * @p contains the task_struct for process.
596 * Deallocate and clear the p->security field.
597 * @task_setuid:
598 * Check permission before setting one or more of the user identity
599 * attributes of the current process. The @flags parameter indicates
600 * which of the set*uid system calls invoked this hook and how to
601 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
602 * definitions at the beginning of this file for the @flags values and
603 * their meanings.
604 * @id0 contains a uid.
605 * @id1 contains a uid.
606 * @id2 contains a uid.
607 * @flags contains one of the LSM_SETID_* values.
608 * Return 0 if permission is granted.
609 * @task_post_setuid:
610 * Update the module's state after setting one or more of the user
611 * identity attributes of the current process. The @flags parameter
612 * indicates which of the set*uid system calls invoked this hook. If
613 * @flags is LSM_SETID_FS, then @old_ruid is the old fs uid and the other
614 * parameters are not used.
615 * @old_ruid contains the old real uid (or fs uid if LSM_SETID_FS).
616 * @old_euid contains the old effective uid (or -1 if LSM_SETID_FS).
617 * @old_suid contains the old saved uid (or -1 if LSM_SETID_FS).
618 * @flags contains one of the LSM_SETID_* values.
619 * Return 0 on success.
620 * @task_setgid:
621 * Check permission before setting one or more of the group identity
622 * attributes of the current process. The @flags parameter indicates
623 * which of the set*gid system calls invoked this hook and how to
624 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
625 * definitions at the beginning of this file for the @flags values and
626 * their meanings.
627 * @id0 contains a gid.
628 * @id1 contains a gid.
629 * @id2 contains a gid.
630 * @flags contains one of the LSM_SETID_* values.
631 * Return 0 if permission is granted.
632 * @task_setpgid:
633 * Check permission before setting the process group identifier of the
634 * process @p to @pgid.
635 * @p contains the task_struct for process being modified.
636 * @pgid contains the new pgid.
637 * Return 0 if permission is granted.
638 * @task_getpgid:
639 * Check permission before getting the process group identifier of the
640 * process @p.
641 * @p contains the task_struct for the process.
642 * Return 0 if permission is granted.
643 * @task_getsid:
644 * Check permission before getting the session identifier of the process
645 * @p.
646 * @p contains the task_struct for the process.
647 * Return 0 if permission is granted.
648 * @task_getsecid:
649 * Retrieve the security identifier of the process @p.
650 * @p contains the task_struct for the process and place is into @secid.
651 * In case of failure, @secid will be set to zero.
652 *
653 * @task_setgroups:
654 * Check permission before setting the supplementary group set of the
655 * current process.
656 * @group_info contains the new group information.
657 * Return 0 if permission is granted.
658 * @task_setnice:
659 * Check permission before setting the nice value of @p to @nice.
660 * @p contains the task_struct of process.
661 * @nice contains the new nice value.
662 * Return 0 if permission is granted.
663 * @task_setioprio
664 * Check permission before setting the ioprio value of @p to @ioprio.
665 * @p contains the task_struct of process.
666 * @ioprio contains the new ioprio value
667 * Return 0 if permission is granted.
668 * @task_getioprio
669 * Check permission before getting the ioprio value of @p.
670 * @p contains the task_struct of process.
671 * Return 0 if permission is granted.
672 * @task_setrlimit:
673 * Check permission before setting the resource limits of the current
674 * process for @resource to @new_rlim. The old resource limit values can
675 * be examined by dereferencing (current->signal->rlim + resource).
676 * @resource contains the resource whose limit is being set.
677 * @new_rlim contains the new limits for @resource.
678 * Return 0 if permission is granted.
679 * @task_setscheduler:
680 * Check permission before setting scheduling policy and/or parameters of
681 * process @p based on @policy and @lp.
682 * @p contains the task_struct for process.
683 * @policy contains the scheduling policy.
684 * @lp contains the scheduling parameters.
685 * Return 0 if permission is granted.
686 * @task_getscheduler:
687 * Check permission before obtaining scheduling information for process
688 * @p.
689 * @p contains the task_struct for process.
690 * Return 0 if permission is granted.
691 * @task_movememory
692 * Check permission before moving memory owned by process @p.
693 * @p contains the task_struct for process.
694 * Return 0 if permission is granted.
695 * @task_kill:
696 * Check permission before sending signal @sig to @p. @info can be NULL,
697 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
698 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
699 * from the kernel and should typically be permitted.
700 * SIGIO signals are handled separately by the send_sigiotask hook in
701 * file_security_ops.
702 * @p contains the task_struct for process.
703 * @info contains the signal information.
704 * @sig contains the signal value.
705 * @secid contains the sid of the process where the signal originated
706 * Return 0 if permission is granted.
707 * @task_wait:
708 * Check permission before allowing a process to reap a child process @p
709 * and collect its status information.
710 * @p contains the task_struct for process.
711 * Return 0 if permission is granted.
712 * @task_prctl:
713 * Check permission before performing a process control operation on the
714 * current process.
715 * @option contains the operation.
716 * @arg2 contains a argument.
717 * @arg3 contains a argument.
718 * @arg4 contains a argument.
719 * @arg5 contains a argument.
720 * @rc_p contains a pointer to communicate back the forced return code
721 * Return 0 if permission is granted, and non-zero if the security module
722 * has taken responsibility (setting *rc_p) for the prctl call.
723 * @task_reparent_to_init:
724 * Set the security attributes in @p->security for a kernel thread that
725 * is being reparented to the init task.
726 * @p contains the task_struct for the kernel thread.
727 * @task_to_inode:
728 * Set the security attributes for an inode based on an associated task's
729 * security attributes, e.g. for /proc/pid inodes.
730 * @p contains the task_struct for the task.
731 * @inode contains the inode structure for the inode.
732 *
733 * Security hooks for Netlink messaging.
734 *
735 * @netlink_send:
736 * Save security information for a netlink message so that permission
737 * checking can be performed when the message is processed. The security
738 * information can be saved using the eff_cap field of the
739 * netlink_skb_parms structure. Also may be used to provide fine
740 * grained control over message transmission.
741 * @sk associated sock of task sending the message.,
742 * @skb contains the sk_buff structure for the netlink message.
743 * Return 0 if the information was successfully saved and message
744 * is allowed to be transmitted.
745 * @netlink_recv:
746 * Check permission before processing the received netlink message in
747 * @skb.
748 * @skb contains the sk_buff structure for the netlink message.
749 * @cap indicates the capability required
750 * Return 0 if permission is granted.
751 *
752 * Security hooks for Unix domain networking.
753 *
754 * @unix_stream_connect:
755 * Check permissions before establishing a Unix domain stream connection
756 * between @sock and @other.
757 * @sock contains the socket structure.
758 * @other contains the peer socket structure.
759 * Return 0 if permission is granted.
760 * @unix_may_send:
761 * Check permissions before connecting or sending datagrams from @sock to
762 * @other.
763 * @sock contains the socket structure.
764 * @sock contains the peer socket structure.
765 * Return 0 if permission is granted.
766 *
767 * The @unix_stream_connect and @unix_may_send hooks were necessary because
768 * Linux provides an alternative to the conventional file name space for Unix
769 * domain sockets. Whereas binding and connecting to sockets in the file name
770 * space is mediated by the typical file permissions (and caught by the mknod
771 * and permission hooks in inode_security_ops), binding and connecting to
772 * sockets in the abstract name space is completely unmediated. Sufficient
773 * control of Unix domain sockets in the abstract name space isn't possible
774 * using only the socket layer hooks, since we need to know the actual target
775 * socket, which is not looked up until we are inside the af_unix code.
776 *
777 * Security hooks for socket operations.
778 *
779 * @socket_create:
780 * Check permissions prior to creating a new socket.
781 * @family contains the requested protocol family.
782 * @type contains the requested communications type.
783 * @protocol contains the requested protocol.
784 * @kern set to 1 if a kernel socket.
785 * Return 0 if permission is granted.
786 * @socket_post_create:
787 * This hook allows a module to update or allocate a per-socket security
788 * structure. Note that the security field was not added directly to the
789 * socket structure, but rather, the socket security information is stored
790 * in the associated inode. Typically, the inode alloc_security hook will
791 * allocate and and attach security information to
792 * sock->inode->i_security. This hook may be used to update the
793 * sock->inode->i_security field with additional information that wasn't
794 * available when the inode was allocated.
795 * @sock contains the newly created socket structure.
796 * @family contains the requested protocol family.
797 * @type contains the requested communications type.
798 * @protocol contains the requested protocol.
799 * @kern set to 1 if a kernel socket.
800 * @socket_bind:
801 * Check permission before socket protocol layer bind operation is
802 * performed and the socket @sock is bound to the address specified in the
803 * @address parameter.
804 * @sock contains the socket structure.
805 * @address contains the address to bind to.
806 * @addrlen contains the length of address.
807 * Return 0 if permission is granted.
808 * @socket_connect:
809 * Check permission before socket protocol layer connect operation
810 * attempts to connect socket @sock to a remote address, @address.
811 * @sock contains the socket structure.
812 * @address contains the address of remote endpoint.
813 * @addrlen contains the length of address.
814 * Return 0 if permission is granted.
815 * @socket_listen:
816 * Check permission before socket protocol layer listen operation.
817 * @sock contains the socket structure.
818 * @backlog contains the maximum length for the pending connection queue.
819 * Return 0 if permission is granted.
820 * @socket_accept:
821 * Check permission before accepting a new connection. Note that the new
822 * socket, @newsock, has been created and some information copied to it,
823 * but the accept operation has not actually been performed.
824 * @sock contains the listening socket structure.
825 * @newsock contains the newly created server socket for connection.
826 * Return 0 if permission is granted.
827 * @socket_post_accept:
828 * This hook allows a security module to copy security
829 * information into the newly created socket's inode.
830 * @sock contains the listening socket structure.
831 * @newsock contains the newly created server socket for connection.
832 * @socket_sendmsg:
833 * Check permission before transmitting a message to another socket.
834 * @sock contains the socket structure.
835 * @msg contains the message to be transmitted.
836 * @size contains the size of message.
837 * Return 0 if permission is granted.
838 * @socket_recvmsg:
839 * Check permission before receiving a message from a socket.
840 * @sock contains the socket structure.
841 * @msg contains the message structure.
842 * @size contains the size of message structure.
843 * @flags contains the operational flags.
844 * Return 0 if permission is granted.
845 * @socket_getsockname:
846 * Check permission before the local address (name) of the socket object
847 * @sock is retrieved.
848 * @sock contains the socket structure.
849 * Return 0 if permission is granted.
850 * @socket_getpeername:
851 * Check permission before the remote address (name) of a socket object
852 * @sock is retrieved.
853 * @sock contains the socket structure.
854 * Return 0 if permission is granted.
855 * @socket_getsockopt:
856 * Check permissions before retrieving the options associated with socket
857 * @sock.
858 * @sock contains the socket structure.
859 * @level contains the protocol level to retrieve option from.
860 * @optname contains the name of option to retrieve.
861 * Return 0 if permission is granted.
862 * @socket_setsockopt:
863 * Check permissions before setting the options associated with socket
864 * @sock.
865 * @sock contains the socket structure.
866 * @level contains the protocol level to set options for.
867 * @optname contains the name of the option to set.
868 * Return 0 if permission is granted.
869 * @socket_shutdown:
870 * Checks permission before all or part of a connection on the socket
871 * @sock is shut down.
872 * @sock contains the socket structure.
873 * @how contains the flag indicating how future sends and receives are handled.
874 * Return 0 if permission is granted.
875 * @socket_sock_rcv_skb:
876 * Check permissions on incoming network packets. This hook is distinct
877 * from Netfilter's IP input hooks since it is the first time that the
878 * incoming sk_buff @skb has been associated with a particular socket, @sk.
879 * @sk contains the sock (not socket) associated with the incoming sk_buff.
880 * @skb contains the incoming network data.
881 * @socket_getpeersec_stream:
882 * This hook allows the security module to provide peer socket security
883 * state for unix or connected tcp sockets to userspace via getsockopt
884 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
885 * socket is associated with an ipsec SA.
886 * @sock is the local socket.
887 * @optval userspace memory where the security state is to be copied.
888 * @optlen userspace int where the module should copy the actual length
889 * of the security state.
890 * @len as input is the maximum length to copy to userspace provided
891 * by the caller.
892 * Return 0 if all is well, otherwise, typical getsockopt return
893 * values.
894 * @socket_getpeersec_dgram:
895 * This hook allows the security module to provide peer socket security
896 * state for udp sockets on a per-packet basis to userspace via
897 * getsockopt SO_GETPEERSEC. The application must first have indicated
898 * the IP_PASSSEC option via getsockopt. It can then retrieve the
899 * security state returned by this hook for a packet via the SCM_SECURITY
900 * ancillary message type.
901 * @skb is the skbuff for the packet being queried
902 * @secdata is a pointer to a buffer in which to copy the security data
903 * @seclen is the maximum length for @secdata
904 * Return 0 on success, error on failure.
905 * @sk_alloc_security:
906 * Allocate and attach a security structure to the sk->sk_security field,
907 * which is used to copy security attributes between local stream sockets.
908 * @sk_free_security:
909 * Deallocate security structure.
910 * @sk_clone_security:
911 * Clone/copy security structure.
912 * @sk_getsecid:
913 * Retrieve the LSM-specific secid for the sock to enable caching of network
914 * authorizations.
915 * @sock_graft:
916 * Sets the socket's isec sid to the sock's sid.
917 * @inet_conn_request:
918 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
919 * @inet_csk_clone:
920 * Sets the new child socket's sid to the openreq sid.
921 * @inet_conn_established:
922 * Sets the connection's peersid to the secmark on skb.
923 * @req_classify_flow:
924 * Sets the flow's sid to the openreq sid.
925 *
926 * Security hooks for XFRM operations.
927 *
928 * @xfrm_policy_alloc_security:
929 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
930 * Database used by the XFRM system.
931 * @sec_ctx contains the security context information being provided by
932 * the user-level policy update program (e.g., setkey).
933 * Allocate a security structure to the xp->security field; the security
934 * field is initialized to NULL when the xfrm_policy is allocated.
935 * Return 0 if operation was successful (memory to allocate, legal context)
936 * @xfrm_policy_clone_security:
937 * @old_ctx contains an existing xfrm_sec_ctx.
938 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
939 * Allocate a security structure in new_ctxp that contains the
940 * information from the old_ctx structure.
941 * Return 0 if operation was successful (memory to allocate).
942 * @xfrm_policy_free_security:
943 * @ctx contains the xfrm_sec_ctx
944 * Deallocate xp->security.
945 * @xfrm_policy_delete_security:
946 * @ctx contains the xfrm_sec_ctx.
947 * Authorize deletion of xp->security.
948 * @xfrm_state_alloc_security:
949 * @x contains the xfrm_state being added to the Security Association
950 * Database by the XFRM system.
951 * @sec_ctx contains the security context information being provided by
952 * the user-level SA generation program (e.g., setkey or racoon).
953 * @secid contains the secid from which to take the mls portion of the context.
954 * Allocate a security structure to the x->security field; the security
955 * field is initialized to NULL when the xfrm_state is allocated. Set the
956 * context to correspond to either sec_ctx or polsec, with the mls portion
957 * taken from secid in the latter case.
958 * Return 0 if operation was successful (memory to allocate, legal context).
959 * @xfrm_state_free_security:
960 * @x contains the xfrm_state.
961 * Deallocate x->security.
962 * @xfrm_state_delete_security:
963 * @x contains the xfrm_state.
964 * Authorize deletion of x->security.
965 * @xfrm_policy_lookup:
966 * @ctx contains the xfrm_sec_ctx for which the access control is being
967 * checked.
968 * @fl_secid contains the flow security label that is used to authorize
969 * access to the policy xp.
970 * @dir contains the direction of the flow (input or output).
971 * Check permission when a flow selects a xfrm_policy for processing
972 * XFRMs on a packet. The hook is called when selecting either a
973 * per-socket policy or a generic xfrm policy.
974 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
975 * on other errors.
976 * @xfrm_state_pol_flow_match:
977 * @x contains the state to match.
978 * @xp contains the policy to check for a match.
979 * @fl contains the flow to check for a match.
980 * Return 1 if there is a match.
981 * @xfrm_decode_session:
982 * @skb points to skb to decode.
983 * @secid points to the flow key secid to set.
984 * @ckall says if all xfrms used should be checked for same secid.
985 * Return 0 if ckall is zero or all xfrms used have the same secid.
986 *
987 * Security hooks affecting all Key Management operations
988 *
989 * @key_alloc:
990 * Permit allocation of a key and assign security data. Note that key does
991 * not have a serial number assigned at this point.
992 * @key points to the key.
993 * @flags is the allocation flags
994 * Return 0 if permission is granted, -ve error otherwise.
995 * @key_free:
996 * Notification of destruction; free security data.
997 * @key points to the key.
998 * No return value.
999 * @key_permission:
1000 * See whether a specific operational right is granted to a process on a
1001 * key.
1002 * @key_ref refers to the key (key pointer + possession attribute bit).
1003 * @context points to the process to provide the context against which to
1004 * evaluate the security data on the key.
1005 * @perm describes the combination of permissions required of this key.
1006 * Return 1 if permission granted, 0 if permission denied and -ve it the
1007 * normal permissions model should be effected.
1008 * @key_getsecurity:
1009 * Get a textual representation of the security context attached to a key
1010 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1011 * allocates the storage for the NUL-terminated string and the caller
1012 * should free it.
1013 * @key points to the key to be queried.
1014 * @_buffer points to a pointer that should be set to point to the
1015 * resulting string (if no label or an error occurs).
1016 * Return the length of the string (including terminating NUL) or -ve if
1017 * an error.
1018 * May also return 0 (and a NULL buffer pointer) if there is no label.
1019 *
1020 * Security hooks affecting all System V IPC operations.
1021 *
1022 * @ipc_permission:
1023 * Check permissions for access to IPC
1024 * @ipcp contains the kernel IPC permission structure
1025 * @flag contains the desired (requested) permission set
1026 * Return 0 if permission is granted.
1027 * @ipc_getsecid:
1028 * Get the secid associated with the ipc object.
1029 * @ipcp contains the kernel IPC permission structure.
1030 * @secid contains a pointer to the location where result will be saved.
1031 * In case of failure, @secid will be set to zero.
1032 *
1033 * Security hooks for individual messages held in System V IPC message queues
1034 * @msg_msg_alloc_security:
1035 * Allocate and attach a security structure to the msg->security field.
1036 * The security field is initialized to NULL when the structure is first
1037 * created.
1038 * @msg contains the message structure to be modified.
1039 * Return 0 if operation was successful and permission is granted.
1040 * @msg_msg_free_security:
1041 * Deallocate the security structure for this message.
1042 * @msg contains the message structure to be modified.
1043 *
1044 * Security hooks for System V IPC Message Queues
1045 *
1046 * @msg_queue_alloc_security:
1047 * Allocate and attach a security structure to the
1048 * msq->q_perm.security field. The security field is initialized to
1049 * NULL when the structure is first created.
1050 * @msq contains the message queue structure to be modified.
1051 * Return 0 if operation was successful and permission is granted.
1052 * @msg_queue_free_security:
1053 * Deallocate security structure for this message queue.
1054 * @msq contains the message queue structure to be modified.
1055 * @msg_queue_associate:
1056 * Check permission when a message queue is requested through the
1057 * msgget system call. This hook is only called when returning the
1058 * message queue identifier for an existing message queue, not when a
1059 * new message queue is created.
1060 * @msq contains the message queue to act upon.
1061 * @msqflg contains the operation control flags.
1062 * Return 0 if permission is granted.
1063 * @msg_queue_msgctl:
1064 * Check permission when a message control operation specified by @cmd
1065 * is to be performed on the message queue @msq.
1066 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1067 * @msq contains the message queue to act upon. May be NULL.
1068 * @cmd contains the operation to be performed.
1069 * Return 0 if permission is granted.
1070 * @msg_queue_msgsnd:
1071 * Check permission before a message, @msg, is enqueued on the message
1072 * queue, @msq.
1073 * @msq contains the message queue to send message to.
1074 * @msg contains the message to be enqueued.
1075 * @msqflg contains operational flags.
1076 * Return 0 if permission is granted.
1077 * @msg_queue_msgrcv:
1078 * Check permission before a message, @msg, is removed from the message
1079 * queue, @msq. The @target task structure contains a pointer to the
1080 * process that will be receiving the message (not equal to the current
1081 * process when inline receives are being performed).
1082 * @msq contains the message queue to retrieve message from.
1083 * @msg contains the message destination.
1084 * @target contains the task structure for recipient process.
1085 * @type contains the type of message requested.
1086 * @mode contains the operational flags.
1087 * Return 0 if permission is granted.
1088 *
1089 * Security hooks for System V Shared Memory Segments
1090 *
1091 * @shm_alloc_security:
1092 * Allocate and attach a security structure to the shp->shm_perm.security
1093 * field. The security field is initialized to NULL when the structure is
1094 * first created.
1095 * @shp contains the shared memory structure to be modified.
1096 * Return 0 if operation was successful and permission is granted.
1097 * @shm_free_security:
1098 * Deallocate the security struct for this memory segment.
1099 * @shp contains the shared memory structure to be modified.
1100 * @shm_associate:
1101 * Check permission when a shared memory region is requested through the
1102 * shmget system call. This hook is only called when returning the shared
1103 * memory region identifier for an existing region, not when a new shared
1104 * memory region is created.
1105 * @shp contains the shared memory structure to be modified.
1106 * @shmflg contains the operation control flags.
1107 * Return 0 if permission is granted.
1108 * @shm_shmctl:
1109 * Check permission when a shared memory control operation specified by
1110 * @cmd is to be performed on the shared memory region @shp.
1111 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1112 * @shp contains shared memory structure to be modified.
1113 * @cmd contains the operation to be performed.
1114 * Return 0 if permission is granted.
1115 * @shm_shmat:
1116 * Check permissions prior to allowing the shmat system call to attach the
1117 * shared memory segment @shp to the data segment of the calling process.
1118 * The attaching address is specified by @shmaddr.
1119 * @shp contains the shared memory structure to be modified.
1120 * @shmaddr contains the address to attach memory region to.
1121 * @shmflg contains the operational flags.
1122 * Return 0 if permission is granted.
1123 *
1124 * Security hooks for System V Semaphores
1125 *
1126 * @sem_alloc_security:
1127 * Allocate and attach a security structure to the sma->sem_perm.security
1128 * field. The security field is initialized to NULL when the structure is
1129 * first created.
1130 * @sma contains the semaphore structure
1131 * Return 0 if operation was successful and permission is granted.
1132 * @sem_free_security:
1133 * deallocate security struct for this semaphore
1134 * @sma contains the semaphore structure.
1135 * @sem_associate:
1136 * Check permission when a semaphore is requested through the semget
1137 * system call. This hook is only called when returning the semaphore
1138 * identifier for an existing semaphore, not when a new one must be
1139 * created.
1140 * @sma contains the semaphore structure.
1141 * @semflg contains the operation control flags.
1142 * Return 0 if permission is granted.
1143 * @sem_semctl:
1144 * Check permission when a semaphore operation specified by @cmd is to be
1145 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1146 * IPC_INFO or SEM_INFO.
1147 * @sma contains the semaphore structure. May be NULL.
1148 * @cmd contains the operation to be performed.
1149 * Return 0 if permission is granted.
1150 * @sem_semop
1151 * Check permissions before performing operations on members of the
1152 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1153 * may be modified.
1154 * @sma contains the semaphore structure.
1155 * @sops contains the operations to perform.
1156 * @nsops contains the number of operations to perform.
1157 * @alter contains the flag indicating whether changes are to be made.
1158 * Return 0 if permission is granted.
1159 *
1160 * @ptrace_may_access:
1161 * Check permission before allowing the current process to trace the
1162 * @child process.
1163 * Security modules may also want to perform a process tracing check
1164 * during an execve in the set_security or apply_creds hooks of
1165 * binprm_security_ops if the process is being traced and its security
1166 * attributes would be changed by the execve.
1167 * @child contains the task_struct structure for the target process.
1168 * @mode contains the PTRACE_MODE flags indicating the form of access.
1169 * Return 0 if permission is granted.
1170 * @ptrace_traceme:
1171 * Check that the @parent process has sufficient permission to trace the
1172 * current process before allowing the current process to present itself
1173 * to the @parent process for tracing.
1174 * The parent process will still have to undergo the ptrace_may_access
1175 * checks before it is allowed to trace this one.
1176 * @parent contains the task_struct structure for debugger process.
1177 * Return 0 if permission is granted.
1178 * @capget:
1179 * Get the @effective, @inheritable, and @permitted capability sets for
1180 * the @target process. The hook may also perform permission checking to
1181 * determine if the current process is allowed to see the capability sets
1182 * of the @target process.
1183 * @target contains the task_struct structure for target process.
1184 * @effective contains the effective capability set.
1185 * @inheritable contains the inheritable capability set.
1186 * @permitted contains the permitted capability set.
1187 * Return 0 if the capability sets were successfully obtained.
1188 * @capset_check:
1189 * Check permission before setting the @effective, @inheritable, and
1190 * @permitted capability sets for the @target process.
1191 * Caveat: @target is also set to current if a set of processes is
1192 * specified (i.e. all processes other than current and init or a
1193 * particular process group). Hence, the capset_set hook may need to
1194 * revalidate permission to the actual target process.
1195 * @target contains the task_struct structure for target process.
1196 * @effective contains the effective capability set.
1197 * @inheritable contains the inheritable capability set.
1198 * @permitted contains the permitted capability set.
1199 * Return 0 if permission is granted.
1200 * @capset_set:
1201 * Set the @effective, @inheritable, and @permitted capability sets for
1202 * the @target process. Since capset_check cannot always check permission
1203 * to the real @target process, this hook may also perform permission
1204 * checking to determine if the current process is allowed to set the
1205 * capability sets of the @target process. However, this hook has no way
1206 * of returning an error due to the structure of the sys_capset code.
1207 * @target contains the task_struct structure for target process.
1208 * @effective contains the effective capability set.
1209 * @inheritable contains the inheritable capability set.
1210 * @permitted contains the permitted capability set.
1211 * @capable:
1212 * Check whether the @tsk process has the @cap capability.
1213 * @tsk contains the task_struct for the process.
1214 * @cap contains the capability <include/linux/capability.h>.
1215 * Return 0 if the capability is granted for @tsk.
1216 * @acct:
1217 * Check permission before enabling or disabling process accounting. If
1218 * accounting is being enabled, then @file refers to the open file used to
1219 * store accounting records. If accounting is being disabled, then @file
1220 * is NULL.
1221 * @file contains the file structure for the accounting file (may be NULL).
1222 * Return 0 if permission is granted.
1223 * @sysctl:
1224 * Check permission before accessing the @table sysctl variable in the
1225 * manner specified by @op.
1226 * @table contains the ctl_table structure for the sysctl variable.
1227 * @op contains the operation (001 = search, 002 = write, 004 = read).
1228 * Return 0 if permission is granted.
1229 * @syslog:
1230 * Check permission before accessing the kernel message ring or changing
1231 * logging to the console.
1232 * See the syslog(2) manual page for an explanation of the @type values.
1233 * @type contains the type of action.
1234 * Return 0 if permission is granted.
1235 * @settime:
1236 * Check permission to change the system time.
1237 * struct timespec and timezone are defined in include/linux/time.h
1238 * @ts contains new time
1239 * @tz contains new timezone
1240 * Return 0 if permission is granted.
1241 * @vm_enough_memory:
1242 * Check permissions for allocating a new virtual mapping.
1243 * @mm contains the mm struct it is being added to.
1244 * @pages contains the number of pages.
1245 * Return 0 if permission is granted.
1246 *
1247 * @secid_to_secctx:
1248 * Convert secid to security context.
1249 * @secid contains the security ID.
1250 * @secdata contains the pointer that stores the converted security context.
1251 * @secctx_to_secid:
1252 * Convert security context to secid.
1253 * @secid contains the pointer to the generated security ID.
1254 * @secdata contains the security context.
1255 *
1256 * @release_secctx:
1257 * Release the security context.
1258 * @secdata contains the security context.
1259 * @seclen contains the length of the security context.
1260 *
1261 * Security hooks for Audit
1262 *
1263 * @audit_rule_init:
1264 * Allocate and initialize an LSM audit rule structure.
1265 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1266 * @op contains the operator the rule uses.
1267 * @rulestr contains the context where the rule will be applied to.
1268 * @lsmrule contains a pointer to receive the result.
1269 * Return 0 if @lsmrule has been successfully set,
1270 * -EINVAL in case of an invalid rule.
1271 *
1272 * @audit_rule_known:
1273 * Specifies whether given @rule contains any fields related to current LSM.
1274 * @rule contains the audit rule of interest.
1275 * Return 1 in case of relation found, 0 otherwise.
1276 *
1277 * @audit_rule_match:
1278 * Determine if given @secid matches a rule previously approved
1279 * by @audit_rule_known.
1280 * @secid contains the security id in question.
1281 * @field contains the field which relates to current LSM.
1282 * @op contains the operator that will be used for matching.
1283 * @rule points to the audit rule that will be checked against.
1284 * @actx points to the audit context associated with the check.
1285 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1286 *
1287 * @audit_rule_free:
1288 * Deallocate the LSM audit rule structure previously allocated by
1289 * audit_rule_init.
1290 * @rule contains the allocated rule
1291 *
1292 * This is the main security structure.
1293 */
1385 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1386 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1482 #ifdef CONFIG_SECURITY_NETWORK
1508 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1522 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1525 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1530 u32 secid);
1540 /* key management security hooks */
1541 #ifdef CONFIG_KEYS
1546 key_perm_t perm);
1550 #ifdef CONFIG_AUDIT
1557 };
1559 /* prototypes */
1564 /* Security operations */
1647 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1648 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1728 };
1731 {
1732 }
1735 {
1736 }
1738 /*
1739 * This is the default capabilities functionality. Most of these functions
1740 * are just stubbed out, but a few must call the proper capable code.
1741 */
1744 {
1746 }
1750 {
1752 }
1755 {
1757 }
1763 {
1765 }
1771 {
1773 }
1779 {
1781 }
1784 {
1786 }
1789 {
1791 }
1794 {
1796 }
1800 {
1802 }
1805 {
1807 }
1810 {
1812 }
1815 {
1817 }
1820 {
1823 }
1826 {
1829 }
1832 {
1833 /* If current->mm is a kernel thread then we will pass NULL,
1834 for this specific case that is fine */
1836 }
1839 {
1841 }
1844 { }
1847 {
1849 }
1852 {
1854 }
1857 {
1859 }
1862 {
1864 }
1867 {
1869 }
1872 {
1874 }
1877 { }
1880 {
1882 }
1885 {
1887 }
1891 {
1893 }
1896 {
1898 }
1903 {
1905 }
1909 {
1911 }
1914 {
1916 }
1919 { }
1922 { }
1926 { }
1930 { }
1934 {
1936 }
1940 { }
1944 {
1946 }
1950 { }
1953 {
1955 }
1958 {
1960 }
1963 { }
1970 {
1972 }
1977 {
1979 }
1984 {
1986 }
1990 {
1992 }
1997 {
1999 }
2004 {
2006 }
2010 {
2012 }
2017 {
2019 }
2025 {
2027 }
2030 {
2032 }
2036 {
2038 }
2041 {
2043 }
2047 {
2049 }
2053 {
2055 }
2058 { }
2062 {
2064 }
2068 { }
2072 {
2074 }
2077 {
2079 }
2083 {
2085 }
2088 {
2090 }
2093 {
2095 }
2097 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2098 {
2100 }
2102 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2103 {
2105 }
2107 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2108 {
2110 }
2113 {
2115 }
2118 {
2120 }
2123 {
2125 }
2128 { }
2132 {
2134 }
2141 {
2143 }
2148 {
2150 }
2153 {
2155 }
2159 {
2161 }
2164 {
2166 }
2171 {
2173 }
2176 {
2178 }
2181 {
2183 }
2186 {
2188 }
2191 {
2193 }
2196 { }
2200 {
2202 }
2206 {
2208 }
2212 {
2214 }
2217 {
2219 }
2222 {
2224 }
2227 {
2229 }
2232 {
2234 }
2237 {
2239 }
2242 {
2244 }
2247 {
2249 }
2252 {
2254 }
2258 {
2260 }
2265 {
2267 }
2270 {
2272 }
2275 {
2277 }
2281 u32 secid)
2282 {
2284 }
2287 {
2289 }
2295 {
2297 }
2300 {
2302 }
2305 { }
2309 {
2311 }
2314 {
2316 }
2319 {
2321 }
2324 { }
2327 {
2329 }
2332 { }
2336 {
2338 }
2341 {
2343 }
2347 {
2349 }
2355 {
2357 }
2360 {
2362 }
2365 { }
2369 {
2371 }
2374 {
2376 }
2380 {
2382 }
2385 {
2387 }
2390 { }
2393 {
2395 }
2398 {
2400 }
2405 {
2407 }
2410 { }
2413 {
2415 }
2417 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2418 {
2420 }
2423 {
2425 }
2428 {
2430 }
2433 {
2435 }
2438 u32 seclen,
2440 {
2442 }
2445 {
2446 }
2449 #ifdef CONFIG_SECURITY_NETWORK
2491 {
2493 }
2497 {
2499 }
2503 {
2505 }
2511 {
2513 }
2518 {
2520 }
2525 {
2527 }
2530 {
2532 }
2536 {
2538 }
2542 {
2543 }
2547 {
2549 }
2554 {
2556 }
2559 {
2561 }
2564 {
2566 }
2570 {
2572 }
2576 {
2578 }
2581 {
2583 }
2586 {
2588 }
2592 {
2594 }
2596 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2597 {
2599 }
2602 {
2604 }
2607 {
2608 }
2611 {
2612 }
2615 {
2616 }
2618 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2619 {
2620 }
2623 {
2624 }
2628 {
2630 }
2634 {
2635 }
2639 {
2640 }
2643 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2662 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2663 {
2665 }
2667 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2668 {
2670 }
2673 {
2674 }
2677 {
2679 }
2683 {
2685 }
2689 {
2691 }
2694 {
2695 }
2698 {
2700 }
2703 {
2705 }
2709 {
2711 }
2714 {
2716 }
2719 {
2720 }
2724 #ifdef CONFIG_KEYS
2725 #ifdef CONFIG_SECURITY
2733 #else
2738 {
2740 }
2743 {
2744 }
2748 key_perm_t perm)
2749 {
2751 }
2754 {
2757 }
2759 #endif
2762 #ifdef CONFIG_AUDIT
2763 #ifdef CONFIG_SECURITY
2770 #else
2774 {
2776 }
2779 {
2781 }
2785 {
2787 }
2790 { }
2795 #ifdef CONFIG_SECURITYFS
2807 {
2809 }
2812 mode_t mode,
2816 {
2818 }
2821 {}
2823 #endif