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1 /*
2 * Linux Security plug
3 *
4 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
5 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
7 * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
8 * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * Due to this file being licensed under the GPL there is controversy over
16 * whether this permits you to write a module that #includes this file
17 * without placing your module under the GPL. Please consult a lawyer for
18 * advice before doing this.
19 *
20 */
22 #ifndef __LINUX_SECURITY_H
23 #define __LINUX_SECURITY_H
25 #include <linux/fs.h>
26 #include <linux/binfmts.h>
27 #include <linux/signal.h>
28 #include <linux/resource.h>
29 #include <linux/sem.h>
30 #include <linux/shm.h>
32 #include <linux/msg.h>
33 #include <linux/sched.h>
34 #include <linux/key.h>
35 #include <linux/xfrm.h>
36 #include <linux/gfp.h>
37 #include <net/flow.h>
39 /* Maximum number of letters for an LSM name string */
40 #define SECURITY_NAME_MAX 10
42 /* If capable should audit the security request */
43 #define SECURITY_CAP_NOAUDIT 0
44 #define SECURITY_CAP_AUDIT 1
49 /*
50 * These functions are in security/capability.c and are used
51 * as the default capabilities functions
52 */
58 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
100 /*
101 * Values used in the task_security_ops calls
102 */
103 /* setuid or setgid, id0 == uid or gid */
104 #define LSM_SETID_ID 1
106 /* setreuid or setregid, id0 == real, id1 == eff */
107 #define LSM_SETID_RE 2
109 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
110 #define LSM_SETID_RES 4
112 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
113 #define LSM_SETID_FS 8
115 /* forward declares to avoid warnings */
119 /* bprm->unsafe reasons */
120 #define LSM_UNSAFE_SHARE 1
121 #define LSM_UNSAFE_PTRACE 2
122 #define LSM_UNSAFE_PTRACE_CAP 4
124 /*
125 * If a hint addr is less than mmap_min_addr change hint to be as
126 * low as possible but still greater than mmap_min_addr
127 */
129 {
135 }
139 #ifdef CONFIG_SECURITY
145 };
148 {
152 }
155 {
165 }
167 /**
168 * struct security_operations - main security structure
169 *
170 * Security module identifier.
171 *
172 * @name:
173 * A string that acts as a unique identifeir for the LSM with max number
174 * of characters = SECURITY_NAME_MAX.
175 *
176 * Security hooks for program execution operations.
177 *
178 * @bprm_set_creds:
179 * Save security information in the bprm->security field, typically based
180 * on information about the bprm->file, for later use by the apply_creds
181 * hook. This hook may also optionally check permissions (e.g. for
182 * transitions between security domains).
183 * This hook may be called multiple times during a single execve, e.g. for
184 * interpreters. The hook can tell whether it has already been called by
185 * checking to see if @bprm->security is non-NULL. If so, then the hook
186 * may decide either to retain the security information saved earlier or
187 * to replace it.
188 * @bprm contains the linux_binprm structure.
189 * Return 0 if the hook is successful and permission is granted.
190 * @bprm_check_security:
191 * This hook mediates the point when a search for a binary handler will
192 * begin. It allows a check the @bprm->security value which is set in the
193 * preceding set_creds call. The primary difference from set_creds is
194 * that the argv list and envp list are reliably available in @bprm. This
195 * hook may be called multiple times during a single execve; and in each
196 * pass set_creds is called first.
197 * @bprm contains the linux_binprm structure.
198 * Return 0 if the hook is successful and permission is granted.
199 * @bprm_committing_creds:
200 * Prepare to install the new security attributes of a process being
201 * transformed by an execve operation, based on the old credentials
202 * pointed to by @current->cred and the information set in @bprm->cred by
203 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
204 * This hook is a good place to perform state changes on the process such
205 * as closing open file descriptors to which access will no longer be
206 * granted when the attributes are changed. This is called immediately
207 * before commit_creds().
208 * @bprm_committed_creds:
209 * Tidy up after the installation of the new security attributes of a
210 * process being transformed by an execve operation. The new credentials
211 * have, by this point, been set to @current->cred. @bprm points to the
212 * linux_binprm structure. This hook is a good place to perform state
213 * changes on the process such as clearing out non-inheritable signal
214 * state. This is called immediately after commit_creds().
215 * @bprm_secureexec:
216 * Return a boolean value (0 or 1) indicating whether a "secure exec"
217 * is required. The flag is passed in the auxiliary table
218 * on the initial stack to the ELF interpreter to indicate whether libc
219 * should enable secure mode.
220 * @bprm contains the linux_binprm structure.
221 *
222 * Security hooks for filesystem operations.
223 *
224 * @sb_alloc_security:
225 * Allocate and attach a security structure to the sb->s_security field.
226 * The s_security field is initialized to NULL when the structure is
227 * allocated.
228 * @sb contains the super_block structure to be modified.
229 * Return 0 if operation was successful.
230 * @sb_free_security:
231 * Deallocate and clear the sb->s_security field.
232 * @sb contains the super_block structure to be modified.
233 * @sb_statfs:
234 * Check permission before obtaining filesystem statistics for the @mnt
235 * mountpoint.
236 * @dentry is a handle on the superblock for the filesystem.
237 * Return 0 if permission is granted.
238 * @sb_mount:
239 * Check permission before an object specified by @dev_name is mounted on
240 * the mount point named by @nd. For an ordinary mount, @dev_name
241 * identifies a device if the file system type requires a device. For a
242 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
243 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
244 * pathname of the object being mounted.
245 * @dev_name contains the name for object being mounted.
246 * @path contains the path for mount point object.
247 * @type contains the filesystem type.
248 * @flags contains the mount flags.
249 * @data contains the filesystem-specific data.
250 * Return 0 if permission is granted.
251 * @sb_copy_data:
252 * Allow mount option data to be copied prior to parsing by the filesystem,
253 * so that the security module can extract security-specific mount
254 * options cleanly (a filesystem may modify the data e.g. with strsep()).
255 * This also allows the original mount data to be stripped of security-
256 * specific options to avoid having to make filesystems aware of them.
257 * @type the type of filesystem being mounted.
258 * @orig the original mount data copied from userspace.
259 * @copy copied data which will be passed to the security module.
260 * Returns 0 if the copy was successful.
261 * @sb_check_sb:
262 * Check permission before the device with superblock @mnt->sb is mounted
263 * on the mount point named by @nd.
264 * @mnt contains the vfsmount for device being mounted.
265 * @path contains the path for the mount point.
266 * Return 0 if permission is granted.
267 * @sb_umount:
268 * Check permission before the @mnt file system is unmounted.
269 * @mnt contains the mounted file system.
270 * @flags contains the unmount flags, e.g. MNT_FORCE.
271 * Return 0 if permission is granted.
272 * @sb_umount_close:
273 * Close any files in the @mnt mounted filesystem that are held open by
274 * the security module. This hook is called during an umount operation
275 * prior to checking whether the filesystem is still busy.
276 * @mnt contains the mounted filesystem.
277 * @sb_umount_busy:
278 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
279 * any files that were closed by umount_close. This hook is called during
280 * an umount operation if the umount fails after a call to the
281 * umount_close hook.
282 * @mnt contains the mounted filesystem.
283 * @sb_post_remount:
284 * Update the security module's state when a filesystem is remounted.
285 * This hook is only called if the remount was successful.
286 * @mnt contains the mounted file system.
287 * @flags contains the new filesystem flags.
288 * @data contains the filesystem-specific data.
289 * @sb_post_addmount:
290 * Update the security module's state when a filesystem is mounted.
291 * This hook is called any time a mount is successfully grafetd to
292 * the tree.
293 * @mnt contains the mounted filesystem.
294 * @mountpoint contains the path for the mount point.
295 * @sb_pivotroot:
296 * Check permission before pivoting the root filesystem.
297 * @old_path contains the path for the new location of the current root (put_old).
298 * @new_path contains the path for the new root (new_root).
299 * Return 0 if permission is granted.
300 * @sb_post_pivotroot:
301 * Update module state after a successful pivot.
302 * @old_path contains the path for the old root.
303 * @new_path contains the path for the new root.
304 * @sb_set_mnt_opts:
305 * Set the security relevant mount options used for a superblock
306 * @sb the superblock to set security mount options for
307 * @opts binary data structure containing all lsm mount data
308 * @sb_clone_mnt_opts:
309 * Copy all security options from a given superblock to another
310 * @oldsb old superblock which contain information to clone
311 * @newsb new superblock which needs filled in
312 * @sb_parse_opts_str:
313 * Parse a string of security data filling in the opts structure
314 * @options string containing all mount options known by the LSM
315 * @opts binary data structure usable by the LSM
316 *
317 * Security hooks for inode operations.
318 *
319 * @inode_alloc_security:
320 * Allocate and attach a security structure to @inode->i_security. The
321 * i_security field is initialized to NULL when the inode structure is
322 * allocated.
323 * @inode contains the inode structure.
324 * Return 0 if operation was successful.
325 * @inode_free_security:
326 * @inode contains the inode structure.
327 * Deallocate the inode security structure and set @inode->i_security to
328 * NULL.
329 * @inode_init_security:
330 * Obtain the security attribute name suffix and value to set on a newly
331 * created inode and set up the incore security field for the new inode.
332 * This hook is called by the fs code as part of the inode creation
333 * transaction and provides for atomic labeling of the inode, unlike
334 * the post_create/mkdir/... hooks called by the VFS. The hook function
335 * is expected to allocate the name and value via kmalloc, with the caller
336 * being responsible for calling kfree after using them.
337 * If the security module does not use security attributes or does
338 * not wish to put a security attribute on this particular inode,
339 * then it should return -EOPNOTSUPP to skip this processing.
340 * @inode contains the inode structure of the newly created inode.
341 * @dir contains the inode structure of the parent directory.
342 * @name will be set to the allocated name suffix (e.g. selinux).
343 * @value will be set to the allocated attribute value.
344 * @len will be set to the length of the value.
345 * Returns 0 if @name and @value have been successfully set,
346 * -EOPNOTSUPP if no security attribute is needed, or
347 * -ENOMEM on memory allocation failure.
348 * @inode_create:
349 * Check permission to create a regular file.
350 * @dir contains inode structure of the parent of the new file.
351 * @dentry contains the dentry structure for the file to be created.
352 * @mode contains the file mode of the file to be created.
353 * Return 0 if permission is granted.
354 * @inode_link:
355 * Check permission before creating a new hard link to a file.
356 * @old_dentry contains the dentry structure for an existing link to the file.
357 * @dir contains the inode structure of the parent directory of the new link.
358 * @new_dentry contains the dentry structure for the new link.
359 * Return 0 if permission is granted.
360 * @path_link:
361 * Check permission before creating a new hard link to a file.
362 * @old_dentry contains the dentry structure for an existing link
363 * to the file.
364 * @new_dir contains the path structure of the parent directory of
365 * the new link.
366 * @new_dentry contains the dentry structure for the new link.
367 * Return 0 if permission is granted.
368 * @inode_unlink:
369 * Check the permission to remove a hard link to a file.
370 * @dir contains the inode structure of parent directory of the file.
371 * @dentry contains the dentry structure for file to be unlinked.
372 * Return 0 if permission is granted.
373 * @path_unlink:
374 * Check the permission to remove a hard link to a file.
375 * @dir contains the path structure of parent directory of the file.
376 * @dentry contains the dentry structure for file to be unlinked.
377 * Return 0 if permission is granted.
378 * @inode_symlink:
379 * Check the permission to create a symbolic link to a file.
380 * @dir contains the inode structure of parent directory of the symbolic link.
381 * @dentry contains the dentry structure of the symbolic link.
382 * @old_name contains the pathname of file.
383 * Return 0 if permission is granted.
384 * @path_symlink:
385 * Check the permission to create a symbolic link to a file.
386 * @dir contains the path structure of parent directory of
387 * the symbolic link.
388 * @dentry contains the dentry structure of the symbolic link.
389 * @old_name contains the pathname of file.
390 * Return 0 if permission is granted.
391 * @inode_mkdir:
392 * Check permissions to create a new directory in the existing directory
393 * associated with inode strcture @dir.
394 * @dir containst the inode structure of parent of the directory to be created.
395 * @dentry contains the dentry structure of new directory.
396 * @mode contains the mode of new directory.
397 * Return 0 if permission is granted.
398 * @path_mkdir:
399 * Check permissions to create a new directory in the existing directory
400 * associated with path strcture @path.
401 * @dir containst the path structure of parent of the directory
402 * to be created.
403 * @dentry contains the dentry structure of new directory.
404 * @mode contains the mode of new directory.
405 * Return 0 if permission is granted.
406 * @inode_rmdir:
407 * Check the permission to remove a directory.
408 * @dir contains the inode structure of parent of the directory to be removed.
409 * @dentry contains the dentry structure of directory to be removed.
410 * Return 0 if permission is granted.
411 * @path_rmdir:
412 * Check the permission to remove a directory.
413 * @dir contains the path structure of parent of the directory to be
414 * removed.
415 * @dentry contains the dentry structure of directory to be removed.
416 * Return 0 if permission is granted.
417 * @inode_mknod:
418 * Check permissions when creating a special file (or a socket or a fifo
419 * file created via the mknod system call). Note that if mknod operation
420 * is being done for a regular file, then the create hook will be called
421 * and not this hook.
422 * @dir contains the inode structure of parent of the new file.
423 * @dentry contains the dentry structure of the new file.
424 * @mode contains the mode of the new file.
425 * @dev contains the device number.
426 * Return 0 if permission is granted.
427 * @path_mknod:
428 * Check permissions when creating a file. Note that this hook is called
429 * even if mknod operation is being done for a regular file.
430 * @dir contains the path structure of parent of the new file.
431 * @dentry contains the dentry structure of the new file.
432 * @mode contains the mode of the new file.
433 * @dev contains the undecoded device number. Use new_decode_dev() to get
434 * the decoded device number.
435 * Return 0 if permission is granted.
436 * @inode_rename:
437 * Check for permission to rename a file or directory.
438 * @old_dir contains the inode structure for parent of the old link.
439 * @old_dentry contains the dentry structure of the old link.
440 * @new_dir contains the inode structure for parent of the new link.
441 * @new_dentry contains the dentry structure of the new link.
442 * Return 0 if permission is granted.
443 * @path_rename:
444 * Check for permission to rename a file or directory.
445 * @old_dir contains the path structure for parent of the old link.
446 * @old_dentry contains the dentry structure of the old link.
447 * @new_dir contains the path structure for parent of the new link.
448 * @new_dentry contains the dentry structure of the new link.
449 * Return 0 if permission is granted.
450 * @inode_readlink:
451 * Check the permission to read the symbolic link.
452 * @dentry contains the dentry structure for the file link.
453 * Return 0 if permission is granted.
454 * @inode_follow_link:
455 * Check permission to follow a symbolic link when looking up a pathname.
456 * @dentry contains the dentry structure for the link.
457 * @nd contains the nameidata structure for the parent directory.
458 * Return 0 if permission is granted.
459 * @inode_permission:
460 * Check permission before accessing an inode. This hook is called by the
461 * existing Linux permission function, so a security module can use it to
462 * provide additional checking for existing Linux permission checks.
463 * Notice that this hook is called when a file is opened (as well as many
464 * other operations), whereas the file_security_ops permission hook is
465 * called when the actual read/write operations are performed.
466 * @inode contains the inode structure to check.
467 * @mask contains the permission mask.
468 * @nd contains the nameidata (may be NULL).
469 * Return 0 if permission is granted.
470 * @inode_setattr:
471 * Check permission before setting file attributes. Note that the kernel
472 * call to notify_change is performed from several locations, whenever
473 * file attributes change (such as when a file is truncated, chown/chmod
474 * operations, transferring disk quotas, etc).
475 * @dentry contains the dentry structure for the file.
476 * @attr is the iattr structure containing the new file attributes.
477 * Return 0 if permission is granted.
478 * @path_truncate:
479 * Check permission before truncating a file.
480 * @path contains the path structure for the file.
481 * @length is the new length of the file.
482 * @time_attrs is the flags passed to do_truncate().
483 * Return 0 if permission is granted.
484 * @inode_getattr:
485 * Check permission before obtaining file attributes.
486 * @mnt is the vfsmount where the dentry was looked up
487 * @dentry contains the dentry structure for the file.
488 * Return 0 if permission is granted.
489 * @inode_delete:
490 * @inode contains the inode structure for deleted inode.
491 * This hook is called when a deleted inode is released (i.e. an inode
492 * with no hard links has its use count drop to zero). A security module
493 * can use this hook to release any persistent label associated with the
494 * inode.
495 * @inode_setxattr:
496 * Check permission before setting the extended attributes
497 * @value identified by @name for @dentry.
498 * Return 0 if permission is granted.
499 * @inode_post_setxattr:
500 * Update inode security field after successful setxattr operation.
501 * @value identified by @name for @dentry.
502 * @inode_getxattr:
503 * Check permission before obtaining the extended attributes
504 * identified by @name for @dentry.
505 * Return 0 if permission is granted.
506 * @inode_listxattr:
507 * Check permission before obtaining the list of extended attribute
508 * names for @dentry.
509 * Return 0 if permission is granted.
510 * @inode_removexattr:
511 * Check permission before removing the extended attribute
512 * identified by @name for @dentry.
513 * Return 0 if permission is granted.
514 * @inode_getsecurity:
515 * Retrieve a copy of the extended attribute representation of the
516 * security label associated with @name for @inode via @buffer. Note that
517 * @name is the remainder of the attribute name after the security prefix
518 * has been removed. @alloc is used to specify of the call should return a
519 * value via the buffer or just the value length Return size of buffer on
520 * success.
521 * @inode_setsecurity:
522 * Set the security label associated with @name for @inode from the
523 * extended attribute value @value. @size indicates the size of the
524 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
525 * Note that @name is the remainder of the attribute name after the
526 * security. prefix has been removed.
527 * Return 0 on success.
528 * @inode_listsecurity:
529 * Copy the extended attribute names for the security labels
530 * associated with @inode into @buffer. The maximum size of @buffer
531 * is specified by @buffer_size. @buffer may be NULL to request
532 * the size of the buffer required.
533 * Returns number of bytes used/required on success.
534 * @inode_need_killpriv:
535 * Called when an inode has been changed.
536 * @dentry is the dentry being changed.
537 * Return <0 on error to abort the inode change operation.
538 * Return 0 if inode_killpriv does not need to be called.
539 * Return >0 if inode_killpriv does need to be called.
540 * @inode_killpriv:
541 * The setuid bit is being removed. Remove similar security labels.
542 * Called with the dentry->d_inode->i_mutex held.
543 * @dentry is the dentry being changed.
544 * Return 0 on success. If error is returned, then the operation
545 * causing setuid bit removal is failed.
546 * @inode_getsecid:
547 * Get the secid associated with the node.
548 * @inode contains a pointer to the inode.
549 * @secid contains a pointer to the location where result will be saved.
550 * In case of failure, @secid will be set to zero.
551 *
552 * Security hooks for file operations
553 *
554 * @file_permission:
555 * Check file permissions before accessing an open file. This hook is
556 * called by various operations that read or write files. A security
557 * module can use this hook to perform additional checking on these
558 * operations, e.g. to revalidate permissions on use to support privilege
559 * bracketing or policy changes. Notice that this hook is used when the
560 * actual read/write operations are performed, whereas the
561 * inode_security_ops hook is called when a file is opened (as well as
562 * many other operations).
563 * Caveat: Although this hook can be used to revalidate permissions for
564 * various system call operations that read or write files, it does not
565 * address the revalidation of permissions for memory-mapped files.
566 * Security modules must handle this separately if they need such
567 * revalidation.
568 * @file contains the file structure being accessed.
569 * @mask contains the requested permissions.
570 * Return 0 if permission is granted.
571 * @file_alloc_security:
572 * Allocate and attach a security structure to the file->f_security field.
573 * The security field is initialized to NULL when the structure is first
574 * created.
575 * @file contains the file structure to secure.
576 * Return 0 if the hook is successful and permission is granted.
577 * @file_free_security:
578 * Deallocate and free any security structures stored in file->f_security.
579 * @file contains the file structure being modified.
580 * @file_ioctl:
581 * @file contains the file structure.
582 * @cmd contains the operation to perform.
583 * @arg contains the operational arguments.
584 * Check permission for an ioctl operation on @file. Note that @arg can
585 * sometimes represents a user space pointer; in other cases, it may be a
586 * simple integer value. When @arg represents a user space pointer, it
587 * should never be used by the security module.
588 * Return 0 if permission is granted.
589 * @file_mmap :
590 * Check permissions for a mmap operation. The @file may be NULL, e.g.
591 * if mapping anonymous memory.
592 * @file contains the file structure for file to map (may be NULL).
593 * @reqprot contains the protection requested by the application.
594 * @prot contains the protection that will be applied by the kernel.
595 * @flags contains the operational flags.
596 * Return 0 if permission is granted.
597 * @file_mprotect:
598 * Check permissions before changing memory access permissions.
599 * @vma contains the memory region to modify.
600 * @reqprot contains the protection requested by the application.
601 * @prot contains the protection that will be applied by the kernel.
602 * Return 0 if permission is granted.
603 * @file_lock:
604 * Check permission before performing file locking operations.
605 * Note: this hook mediates both flock and fcntl style locks.
606 * @file contains the file structure.
607 * @cmd contains the posix-translated lock operation to perform
608 * (e.g. F_RDLCK, F_WRLCK).
609 * Return 0 if permission is granted.
610 * @file_fcntl:
611 * Check permission before allowing the file operation specified by @cmd
612 * from being performed on the file @file. Note that @arg can sometimes
613 * represents a user space pointer; in other cases, it may be a simple
614 * integer value. When @arg represents a user space pointer, it should
615 * never be used by the security module.
616 * @file contains the file structure.
617 * @cmd contains the operation to be performed.
618 * @arg contains the operational arguments.
619 * Return 0 if permission is granted.
620 * @file_set_fowner:
621 * Save owner security information (typically from current->security) in
622 * file->f_security for later use by the send_sigiotask hook.
623 * @file contains the file structure to update.
624 * Return 0 on success.
625 * @file_send_sigiotask:
626 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
627 * process @tsk. Note that this hook is sometimes called from interrupt.
628 * Note that the fown_struct, @fown, is never outside the context of a
629 * struct file, so the file structure (and associated security information)
630 * can always be obtained:
631 * container_of(fown, struct file, f_owner)
632 * @tsk contains the structure of task receiving signal.
633 * @fown contains the file owner information.
634 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
635 * Return 0 if permission is granted.
636 * @file_receive:
637 * This hook allows security modules to control the ability of a process
638 * to receive an open file descriptor via socket IPC.
639 * @file contains the file structure being received.
640 * Return 0 if permission is granted.
641 *
642 * Security hook for dentry
643 *
644 * @dentry_open
645 * Save open-time permission checking state for later use upon
646 * file_permission, and recheck access if anything has changed
647 * since inode_permission.
648 *
649 * Security hooks for task operations.
650 *
651 * @task_create:
652 * Check permission before creating a child process. See the clone(2)
653 * manual page for definitions of the @clone_flags.
654 * @clone_flags contains the flags indicating what should be shared.
655 * Return 0 if permission is granted.
656 * @cred_alloc_blank:
657 * @cred points to the credentials.
658 * @gfp indicates the atomicity of any memory allocations.
659 * Only allocate sufficient memory and attach to @cred such that
660 * cred_transfer() will not get ENOMEM.
661 * @cred_free:
662 * @cred points to the credentials.
663 * Deallocate and clear the cred->security field in a set of credentials.
664 * @cred_prepare:
665 * @new points to the new credentials.
666 * @old points to the original credentials.
667 * @gfp indicates the atomicity of any memory allocations.
668 * Prepare a new set of credentials by copying the data from the old set.
669 * @cred_commit:
670 * @new points to the new credentials.
671 * @old points to the original credentials.
672 * Install a new set of credentials.
673 * @cred_transfer:
674 * @new points to the new credentials.
675 * @old points to the original credentials.
676 * Transfer data from original creds to new creds
677 * @kernel_act_as:
678 * Set the credentials for a kernel service to act as (subjective context).
679 * @new points to the credentials to be modified.
680 * @secid specifies the security ID to be set
681 * The current task must be the one that nominated @secid.
682 * Return 0 if successful.
683 * @kernel_create_files_as:
684 * Set the file creation context in a set of credentials to be the same as
685 * the objective context of the specified inode.
686 * @new points to the credentials to be modified.
687 * @inode points to the inode to use as a reference.
688 * The current task must be the one that nominated @inode.
689 * Return 0 if successful.
690 * @kernel_module_request:
691 * Ability to trigger the kernel to automatically upcall to userspace for
692 * userspace to load a kernel module with the given name.
693 * Return 0 if successful.
694 * @task_setuid:
695 * Check permission before setting one or more of the user identity
696 * attributes of the current process. The @flags parameter indicates
697 * which of the set*uid system calls invoked this hook and how to
698 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
699 * definitions at the beginning of this file for the @flags values and
700 * their meanings.
701 * @id0 contains a uid.
702 * @id1 contains a uid.
703 * @id2 contains a uid.
704 * @flags contains one of the LSM_SETID_* values.
705 * Return 0 if permission is granted.
706 * @task_fix_setuid:
707 * Update the module's state after setting one or more of the user
708 * identity attributes of the current process. The @flags parameter
709 * indicates which of the set*uid system calls invoked this hook. If
710 * @new is the set of credentials that will be installed. Modifications
711 * should be made to this rather than to @current->cred.
712 * @old is the set of credentials that are being replaces
713 * @flags contains one of the LSM_SETID_* values.
714 * Return 0 on success.
715 * @task_setgid:
716 * Check permission before setting one or more of the group identity
717 * attributes of the current process. The @flags parameter indicates
718 * which of the set*gid system calls invoked this hook and how to
719 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
720 * definitions at the beginning of this file for the @flags values and
721 * their meanings.
722 * @id0 contains a gid.
723 * @id1 contains a gid.
724 * @id2 contains a gid.
725 * @flags contains one of the LSM_SETID_* values.
726 * Return 0 if permission is granted.
727 * @task_setpgid:
728 * Check permission before setting the process group identifier of the
729 * process @p to @pgid.
730 * @p contains the task_struct for process being modified.
731 * @pgid contains the new pgid.
732 * Return 0 if permission is granted.
733 * @task_getpgid:
734 * Check permission before getting the process group identifier of the
735 * process @p.
736 * @p contains the task_struct for the process.
737 * Return 0 if permission is granted.
738 * @task_getsid:
739 * Check permission before getting the session identifier of the process
740 * @p.
741 * @p contains the task_struct for the process.
742 * Return 0 if permission is granted.
743 * @task_getsecid:
744 * Retrieve the security identifier of the process @p.
745 * @p contains the task_struct for the process and place is into @secid.
746 * In case of failure, @secid will be set to zero.
747 *
748 * @task_setgroups:
749 * Check permission before setting the supplementary group set of the
750 * current process.
751 * @group_info contains the new group information.
752 * Return 0 if permission is granted.
753 * @task_setnice:
754 * Check permission before setting the nice value of @p to @nice.
755 * @p contains the task_struct of process.
756 * @nice contains the new nice value.
757 * Return 0 if permission is granted.
758 * @task_setioprio
759 * Check permission before setting the ioprio value of @p to @ioprio.
760 * @p contains the task_struct of process.
761 * @ioprio contains the new ioprio value
762 * Return 0 if permission is granted.
763 * @task_getioprio
764 * Check permission before getting the ioprio value of @p.
765 * @p contains the task_struct of process.
766 * Return 0 if permission is granted.
767 * @task_setrlimit:
768 * Check permission before setting the resource limits of the current
769 * process for @resource to @new_rlim. The old resource limit values can
770 * be examined by dereferencing (current->signal->rlim + resource).
771 * @resource contains the resource whose limit is being set.
772 * @new_rlim contains the new limits for @resource.
773 * Return 0 if permission is granted.
774 * @task_setscheduler:
775 * Check permission before setting scheduling policy and/or parameters of
776 * process @p based on @policy and @lp.
777 * @p contains the task_struct for process.
778 * @policy contains the scheduling policy.
779 * @lp contains the scheduling parameters.
780 * Return 0 if permission is granted.
781 * @task_getscheduler:
782 * Check permission before obtaining scheduling information for process
783 * @p.
784 * @p contains the task_struct for process.
785 * Return 0 if permission is granted.
786 * @task_movememory
787 * Check permission before moving memory owned by process @p.
788 * @p contains the task_struct for process.
789 * Return 0 if permission is granted.
790 * @task_kill:
791 * Check permission before sending signal @sig to @p. @info can be NULL,
792 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
793 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
794 * from the kernel and should typically be permitted.
795 * SIGIO signals are handled separately by the send_sigiotask hook in
796 * file_security_ops.
797 * @p contains the task_struct for process.
798 * @info contains the signal information.
799 * @sig contains the signal value.
800 * @secid contains the sid of the process where the signal originated
801 * Return 0 if permission is granted.
802 * @task_wait:
803 * Check permission before allowing a process to reap a child process @p
804 * and collect its status information.
805 * @p contains the task_struct for process.
806 * Return 0 if permission is granted.
807 * @task_prctl:
808 * Check permission before performing a process control operation on the
809 * current process.
810 * @option contains the operation.
811 * @arg2 contains a argument.
812 * @arg3 contains a argument.
813 * @arg4 contains a argument.
814 * @arg5 contains a argument.
815 * Return -ENOSYS if no-one wanted to handle this op, any other value to
816 * cause prctl() to return immediately with that value.
817 * @task_to_inode:
818 * Set the security attributes for an inode based on an associated task's
819 * security attributes, e.g. for /proc/pid inodes.
820 * @p contains the task_struct for the task.
821 * @inode contains the inode structure for the inode.
822 *
823 * Security hooks for Netlink messaging.
824 *
825 * @netlink_send:
826 * Save security information for a netlink message so that permission
827 * checking can be performed when the message is processed. The security
828 * information can be saved using the eff_cap field of the
829 * netlink_skb_parms structure. Also may be used to provide fine
830 * grained control over message transmission.
831 * @sk associated sock of task sending the message.,
832 * @skb contains the sk_buff structure for the netlink message.
833 * Return 0 if the information was successfully saved and message
834 * is allowed to be transmitted.
835 * @netlink_recv:
836 * Check permission before processing the received netlink message in
837 * @skb.
838 * @skb contains the sk_buff structure for the netlink message.
839 * @cap indicates the capability required
840 * Return 0 if permission is granted.
841 *
842 * Security hooks for Unix domain networking.
843 *
844 * @unix_stream_connect:
845 * Check permissions before establishing a Unix domain stream connection
846 * between @sock and @other.
847 * @sock contains the socket structure.
848 * @other contains the peer socket structure.
849 * Return 0 if permission is granted.
850 * @unix_may_send:
851 * Check permissions before connecting or sending datagrams from @sock to
852 * @other.
853 * @sock contains the socket structure.
854 * @sock contains the peer socket structure.
855 * Return 0 if permission is granted.
856 *
857 * The @unix_stream_connect and @unix_may_send hooks were necessary because
858 * Linux provides an alternative to the conventional file name space for Unix
859 * domain sockets. Whereas binding and connecting to sockets in the file name
860 * space is mediated by the typical file permissions (and caught by the mknod
861 * and permission hooks in inode_security_ops), binding and connecting to
862 * sockets in the abstract name space is completely unmediated. Sufficient
863 * control of Unix domain sockets in the abstract name space isn't possible
864 * using only the socket layer hooks, since we need to know the actual target
865 * socket, which is not looked up until we are inside the af_unix code.
866 *
867 * Security hooks for socket operations.
868 *
869 * @socket_create:
870 * Check permissions prior to creating a new socket.
871 * @family contains the requested protocol family.
872 * @type contains the requested communications type.
873 * @protocol contains the requested protocol.
874 * @kern set to 1 if a kernel socket.
875 * Return 0 if permission is granted.
876 * @socket_post_create:
877 * This hook allows a module to update or allocate a per-socket security
878 * structure. Note that the security field was not added directly to the
879 * socket structure, but rather, the socket security information is stored
880 * in the associated inode. Typically, the inode alloc_security hook will
881 * allocate and and attach security information to
882 * sock->inode->i_security. This hook may be used to update the
883 * sock->inode->i_security field with additional information that wasn't
884 * available when the inode was allocated.
885 * @sock contains the newly created socket structure.
886 * @family contains the requested protocol family.
887 * @type contains the requested communications type.
888 * @protocol contains the requested protocol.
889 * @kern set to 1 if a kernel socket.
890 * @socket_bind:
891 * Check permission before socket protocol layer bind operation is
892 * performed and the socket @sock is bound to the address specified in the
893 * @address parameter.
894 * @sock contains the socket structure.
895 * @address contains the address to bind to.
896 * @addrlen contains the length of address.
897 * Return 0 if permission is granted.
898 * @socket_connect:
899 * Check permission before socket protocol layer connect operation
900 * attempts to connect socket @sock to a remote address, @address.
901 * @sock contains the socket structure.
902 * @address contains the address of remote endpoint.
903 * @addrlen contains the length of address.
904 * Return 0 if permission is granted.
905 * @socket_listen:
906 * Check permission before socket protocol layer listen operation.
907 * @sock contains the socket structure.
908 * @backlog contains the maximum length for the pending connection queue.
909 * Return 0 if permission is granted.
910 * @socket_accept:
911 * Check permission before accepting a new connection. Note that the new
912 * socket, @newsock, has been created and some information copied to it,
913 * but the accept operation has not actually been performed.
914 * @sock contains the listening socket structure.
915 * @newsock contains the newly created server socket for connection.
916 * Return 0 if permission is granted.
917 * @socket_sendmsg:
918 * Check permission before transmitting a message to another socket.
919 * @sock contains the socket structure.
920 * @msg contains the message to be transmitted.
921 * @size contains the size of message.
922 * Return 0 if permission is granted.
923 * @socket_recvmsg:
924 * Check permission before receiving a message from a socket.
925 * @sock contains the socket structure.
926 * @msg contains the message structure.
927 * @size contains the size of message structure.
928 * @flags contains the operational flags.
929 * Return 0 if permission is granted.
930 * @socket_getsockname:
931 * Check permission before the local address (name) of the socket object
932 * @sock is retrieved.
933 * @sock contains the socket structure.
934 * Return 0 if permission is granted.
935 * @socket_getpeername:
936 * Check permission before the remote address (name) of a socket object
937 * @sock is retrieved.
938 * @sock contains the socket structure.
939 * Return 0 if permission is granted.
940 * @socket_getsockopt:
941 * Check permissions before retrieving the options associated with socket
942 * @sock.
943 * @sock contains the socket structure.
944 * @level contains the protocol level to retrieve option from.
945 * @optname contains the name of option to retrieve.
946 * Return 0 if permission is granted.
947 * @socket_setsockopt:
948 * Check permissions before setting the options associated with socket
949 * @sock.
950 * @sock contains the socket structure.
951 * @level contains the protocol level to set options for.
952 * @optname contains the name of the option to set.
953 * Return 0 if permission is granted.
954 * @socket_shutdown:
955 * Checks permission before all or part of a connection on the socket
956 * @sock is shut down.
957 * @sock contains the socket structure.
958 * @how contains the flag indicating how future sends and receives are handled.
959 * Return 0 if permission is granted.
960 * @socket_sock_rcv_skb:
961 * Check permissions on incoming network packets. This hook is distinct
962 * from Netfilter's IP input hooks since it is the first time that the
963 * incoming sk_buff @skb has been associated with a particular socket, @sk.
964 * @sk contains the sock (not socket) associated with the incoming sk_buff.
965 * @skb contains the incoming network data.
966 * @socket_getpeersec_stream:
967 * This hook allows the security module to provide peer socket security
968 * state for unix or connected tcp sockets to userspace via getsockopt
969 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
970 * socket is associated with an ipsec SA.
971 * @sock is the local socket.
972 * @optval userspace memory where the security state is to be copied.
973 * @optlen userspace int where the module should copy the actual length
974 * of the security state.
975 * @len as input is the maximum length to copy to userspace provided
976 * by the caller.
977 * Return 0 if all is well, otherwise, typical getsockopt return
978 * values.
979 * @socket_getpeersec_dgram:
980 * This hook allows the security module to provide peer socket security
981 * state for udp sockets on a per-packet basis to userspace via
982 * getsockopt SO_GETPEERSEC. The application must first have indicated
983 * the IP_PASSSEC option via getsockopt. It can then retrieve the
984 * security state returned by this hook for a packet via the SCM_SECURITY
985 * ancillary message type.
986 * @skb is the skbuff for the packet being queried
987 * @secdata is a pointer to a buffer in which to copy the security data
988 * @seclen is the maximum length for @secdata
989 * Return 0 on success, error on failure.
990 * @sk_alloc_security:
991 * Allocate and attach a security structure to the sk->sk_security field,
992 * which is used to copy security attributes between local stream sockets.
993 * @sk_free_security:
994 * Deallocate security structure.
995 * @sk_clone_security:
996 * Clone/copy security structure.
997 * @sk_getsecid:
998 * Retrieve the LSM-specific secid for the sock to enable caching of network
999 * authorizations.
1000 * @sock_graft:
1001 * Sets the socket's isec sid to the sock's sid.
1002 * @inet_conn_request:
1003 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
1004 * @inet_csk_clone:
1005 * Sets the new child socket's sid to the openreq sid.
1006 * @inet_conn_established:
1007 * Sets the connection's peersid to the secmark on skb.
1008 * @req_classify_flow:
1009 * Sets the flow's sid to the openreq sid.
1010 * @tun_dev_create:
1011 * Check permissions prior to creating a new TUN device.
1012 * @tun_dev_post_create:
1013 * This hook allows a module to update or allocate a per-socket security
1014 * structure.
1015 * @sk contains the newly created sock structure.
1016 * @tun_dev_attach:
1017 * Check permissions prior to attaching to a persistent TUN device. This
1018 * hook can also be used by the module to update any security state
1019 * associated with the TUN device's sock structure.
1020 * @sk contains the existing sock structure.
1021 *
1022 * Security hooks for XFRM operations.
1023 *
1024 * @xfrm_policy_alloc_security:
1025 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1026 * Database used by the XFRM system.
1027 * @sec_ctx contains the security context information being provided by
1028 * the user-level policy update program (e.g., setkey).
1029 * Allocate a security structure to the xp->security field; the security
1030 * field is initialized to NULL when the xfrm_policy is allocated.
1031 * Return 0 if operation was successful (memory to allocate, legal context)
1032 * @xfrm_policy_clone_security:
1033 * @old_ctx contains an existing xfrm_sec_ctx.
1034 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1035 * Allocate a security structure in new_ctxp that contains the
1036 * information from the old_ctx structure.
1037 * Return 0 if operation was successful (memory to allocate).
1038 * @xfrm_policy_free_security:
1039 * @ctx contains the xfrm_sec_ctx
1040 * Deallocate xp->security.
1041 * @xfrm_policy_delete_security:
1042 * @ctx contains the xfrm_sec_ctx.
1043 * Authorize deletion of xp->security.
1044 * @xfrm_state_alloc_security:
1045 * @x contains the xfrm_state being added to the Security Association
1046 * Database by the XFRM system.
1047 * @sec_ctx contains the security context information being provided by
1048 * the user-level SA generation program (e.g., setkey or racoon).
1049 * @secid contains the secid from which to take the mls portion of the context.
1050 * Allocate a security structure to the x->security field; the security
1051 * field is initialized to NULL when the xfrm_state is allocated. Set the
1052 * context to correspond to either sec_ctx or polsec, with the mls portion
1053 * taken from secid in the latter case.
1054 * Return 0 if operation was successful (memory to allocate, legal context).
1055 * @xfrm_state_free_security:
1056 * @x contains the xfrm_state.
1057 * Deallocate x->security.
1058 * @xfrm_state_delete_security:
1059 * @x contains the xfrm_state.
1060 * Authorize deletion of x->security.
1061 * @xfrm_policy_lookup:
1062 * @ctx contains the xfrm_sec_ctx for which the access control is being
1063 * checked.
1064 * @fl_secid contains the flow security label that is used to authorize
1065 * access to the policy xp.
1066 * @dir contains the direction of the flow (input or output).
1067 * Check permission when a flow selects a xfrm_policy for processing
1068 * XFRMs on a packet. The hook is called when selecting either a
1069 * per-socket policy or a generic xfrm policy.
1070 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1071 * on other errors.
1072 * @xfrm_state_pol_flow_match:
1073 * @x contains the state to match.
1074 * @xp contains the policy to check for a match.
1075 * @fl contains the flow to check for a match.
1076 * Return 1 if there is a match.
1077 * @xfrm_decode_session:
1078 * @skb points to skb to decode.
1079 * @secid points to the flow key secid to set.
1080 * @ckall says if all xfrms used should be checked for same secid.
1081 * Return 0 if ckall is zero or all xfrms used have the same secid.
1082 *
1083 * Security hooks affecting all Key Management operations
1084 *
1085 * @key_alloc:
1086 * Permit allocation of a key and assign security data. Note that key does
1087 * not have a serial number assigned at this point.
1088 * @key points to the key.
1089 * @flags is the allocation flags
1090 * Return 0 if permission is granted, -ve error otherwise.
1091 * @key_free:
1092 * Notification of destruction; free security data.
1093 * @key points to the key.
1094 * No return value.
1095 * @key_permission:
1096 * See whether a specific operational right is granted to a process on a
1097 * key.
1098 * @key_ref refers to the key (key pointer + possession attribute bit).
1099 * @cred points to the credentials to provide the context against which to
1100 * evaluate the security data on the key.
1101 * @perm describes the combination of permissions required of this key.
1102 * Return 1 if permission granted, 0 if permission denied and -ve it the
1103 * normal permissions model should be effected.
1104 * @key_getsecurity:
1105 * Get a textual representation of the security context attached to a key
1106 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1107 * allocates the storage for the NUL-terminated string and the caller
1108 * should free it.
1109 * @key points to the key to be queried.
1110 * @_buffer points to a pointer that should be set to point to the
1111 * resulting string (if no label or an error occurs).
1112 * Return the length of the string (including terminating NUL) or -ve if
1113 * an error.
1114 * May also return 0 (and a NULL buffer pointer) if there is no label.
1115 * @key_session_to_parent:
1116 * Forcibly assign the session keyring from a process to its parent
1117 * process.
1118 * @cred: Pointer to process's credentials
1119 * @parent_cred: Pointer to parent process's credentials
1120 * @keyring: Proposed new session keyring
1121 * Return 0 if permission is granted, -ve error otherwise.
1122 *
1123 * Security hooks affecting all System V IPC operations.
1124 *
1125 * @ipc_permission:
1126 * Check permissions for access to IPC
1127 * @ipcp contains the kernel IPC permission structure
1128 * @flag contains the desired (requested) permission set
1129 * Return 0 if permission is granted.
1130 * @ipc_getsecid:
1131 * Get the secid associated with the ipc object.
1132 * @ipcp contains the kernel IPC permission structure.
1133 * @secid contains a pointer to the location where result will be saved.
1134 * In case of failure, @secid will be set to zero.
1135 *
1136 * Security hooks for individual messages held in System V IPC message queues
1137 * @msg_msg_alloc_security:
1138 * Allocate and attach a security structure to the msg->security field.
1139 * The security field is initialized to NULL when the structure is first
1140 * created.
1141 * @msg contains the message structure to be modified.
1142 * Return 0 if operation was successful and permission is granted.
1143 * @msg_msg_free_security:
1144 * Deallocate the security structure for this message.
1145 * @msg contains the message structure to be modified.
1146 *
1147 * Security hooks for System V IPC Message Queues
1148 *
1149 * @msg_queue_alloc_security:
1150 * Allocate and attach a security structure to the
1151 * msq->q_perm.security field. The security field is initialized to
1152 * NULL when the structure is first created.
1153 * @msq contains the message queue structure to be modified.
1154 * Return 0 if operation was successful and permission is granted.
1155 * @msg_queue_free_security:
1156 * Deallocate security structure for this message queue.
1157 * @msq contains the message queue structure to be modified.
1158 * @msg_queue_associate:
1159 * Check permission when a message queue is requested through the
1160 * msgget system call. This hook is only called when returning the
1161 * message queue identifier for an existing message queue, not when a
1162 * new message queue is created.
1163 * @msq contains the message queue to act upon.
1164 * @msqflg contains the operation control flags.
1165 * Return 0 if permission is granted.
1166 * @msg_queue_msgctl:
1167 * Check permission when a message control operation specified by @cmd
1168 * is to be performed on the message queue @msq.
1169 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1170 * @msq contains the message queue to act upon. May be NULL.
1171 * @cmd contains the operation to be performed.
1172 * Return 0 if permission is granted.
1173 * @msg_queue_msgsnd:
1174 * Check permission before a message, @msg, is enqueued on the message
1175 * queue, @msq.
1176 * @msq contains the message queue to send message to.
1177 * @msg contains the message to be enqueued.
1178 * @msqflg contains operational flags.
1179 * Return 0 if permission is granted.
1180 * @msg_queue_msgrcv:
1181 * Check permission before a message, @msg, is removed from the message
1182 * queue, @msq. The @target task structure contains a pointer to the
1183 * process that will be receiving the message (not equal to the current
1184 * process when inline receives are being performed).
1185 * @msq contains the message queue to retrieve message from.
1186 * @msg contains the message destination.
1187 * @target contains the task structure for recipient process.
1188 * @type contains the type of message requested.
1189 * @mode contains the operational flags.
1190 * Return 0 if permission is granted.
1191 *
1192 * Security hooks for System V Shared Memory Segments
1193 *
1194 * @shm_alloc_security:
1195 * Allocate and attach a security structure to the shp->shm_perm.security
1196 * field. The security field is initialized to NULL when the structure is
1197 * first created.
1198 * @shp contains the shared memory structure to be modified.
1199 * Return 0 if operation was successful and permission is granted.
1200 * @shm_free_security:
1201 * Deallocate the security struct for this memory segment.
1202 * @shp contains the shared memory structure to be modified.
1203 * @shm_associate:
1204 * Check permission when a shared memory region is requested through the
1205 * shmget system call. This hook is only called when returning the shared
1206 * memory region identifier for an existing region, not when a new shared
1207 * memory region is created.
1208 * @shp contains the shared memory structure to be modified.
1209 * @shmflg contains the operation control flags.
1210 * Return 0 if permission is granted.
1211 * @shm_shmctl:
1212 * Check permission when a shared memory control operation specified by
1213 * @cmd is to be performed on the shared memory region @shp.
1214 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1215 * @shp contains shared memory structure to be modified.
1216 * @cmd contains the operation to be performed.
1217 * Return 0 if permission is granted.
1218 * @shm_shmat:
1219 * Check permissions prior to allowing the shmat system call to attach the
1220 * shared memory segment @shp to the data segment of the calling process.
1221 * The attaching address is specified by @shmaddr.
1222 * @shp contains the shared memory structure to be modified.
1223 * @shmaddr contains the address to attach memory region to.
1224 * @shmflg contains the operational flags.
1225 * Return 0 if permission is granted.
1226 *
1227 * Security hooks for System V Semaphores
1228 *
1229 * @sem_alloc_security:
1230 * Allocate and attach a security structure to the sma->sem_perm.security
1231 * field. The security field is initialized to NULL when the structure is
1232 * first created.
1233 * @sma contains the semaphore structure
1234 * Return 0 if operation was successful and permission is granted.
1235 * @sem_free_security:
1236 * deallocate security struct for this semaphore
1237 * @sma contains the semaphore structure.
1238 * @sem_associate:
1239 * Check permission when a semaphore is requested through the semget
1240 * system call. This hook is only called when returning the semaphore
1241 * identifier for an existing semaphore, not when a new one must be
1242 * created.
1243 * @sma contains the semaphore structure.
1244 * @semflg contains the operation control flags.
1245 * Return 0 if permission is granted.
1246 * @sem_semctl:
1247 * Check permission when a semaphore operation specified by @cmd is to be
1248 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1249 * IPC_INFO or SEM_INFO.
1250 * @sma contains the semaphore structure. May be NULL.
1251 * @cmd contains the operation to be performed.
1252 * Return 0 if permission is granted.
1253 * @sem_semop
1254 * Check permissions before performing operations on members of the
1255 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1256 * may be modified.
1257 * @sma contains the semaphore structure.
1258 * @sops contains the operations to perform.
1259 * @nsops contains the number of operations to perform.
1260 * @alter contains the flag indicating whether changes are to be made.
1261 * Return 0 if permission is granted.
1262 *
1263 * @ptrace_access_check:
1264 * Check permission before allowing the current process to trace the
1265 * @child process.
1266 * Security modules may also want to perform a process tracing check
1267 * during an execve in the set_security or apply_creds hooks of
1268 * tracing check during an execve in the bprm_set_creds hook of
1269 * binprm_security_ops if the process is being traced and its security
1270 * attributes would be changed by the execve.
1271 * @child contains the task_struct structure for the target process.
1272 * @mode contains the PTRACE_MODE flags indicating the form of access.
1273 * Return 0 if permission is granted.
1274 * @ptrace_traceme:
1275 * Check that the @parent process has sufficient permission to trace the
1276 * current process before allowing the current process to present itself
1277 * to the @parent process for tracing.
1278 * The parent process will still have to undergo the ptrace_access_check
1279 * checks before it is allowed to trace this one.
1280 * @parent contains the task_struct structure for debugger process.
1281 * Return 0 if permission is granted.
1282 * @capget:
1283 * Get the @effective, @inheritable, and @permitted capability sets for
1284 * the @target process. The hook may also perform permission checking to
1285 * determine if the current process is allowed to see the capability sets
1286 * of the @target process.
1287 * @target contains the task_struct structure for target process.
1288 * @effective contains the effective capability set.
1289 * @inheritable contains the inheritable capability set.
1290 * @permitted contains the permitted capability set.
1291 * Return 0 if the capability sets were successfully obtained.
1292 * @capset:
1293 * Set the @effective, @inheritable, and @permitted capability sets for
1294 * the current process.
1295 * @new contains the new credentials structure for target process.
1296 * @old contains the current credentials structure for target process.
1297 * @effective contains the effective capability set.
1298 * @inheritable contains the inheritable capability set.
1299 * @permitted contains the permitted capability set.
1300 * Return 0 and update @new if permission is granted.
1301 * @capable:
1302 * Check whether the @tsk process has the @cap capability in the indicated
1303 * credentials.
1304 * @tsk contains the task_struct for the process.
1305 * @cred contains the credentials to use.
1306 * @cap contains the capability <include/linux/capability.h>.
1307 * @audit: Whether to write an audit message or not
1308 * Return 0 if the capability is granted for @tsk.
1309 * @acct:
1310 * Check permission before enabling or disabling process accounting. If
1311 * accounting is being enabled, then @file refers to the open file used to
1312 * store accounting records. If accounting is being disabled, then @file
1313 * is NULL.
1314 * @file contains the file structure for the accounting file (may be NULL).
1315 * Return 0 if permission is granted.
1316 * @sysctl:
1317 * Check permission before accessing the @table sysctl variable in the
1318 * manner specified by @op.
1319 * @table contains the ctl_table structure for the sysctl variable.
1320 * @op contains the operation (001 = search, 002 = write, 004 = read).
1321 * Return 0 if permission is granted.
1322 * @syslog:
1323 * Check permission before accessing the kernel message ring or changing
1324 * logging to the console.
1325 * See the syslog(2) manual page for an explanation of the @type values.
1326 * @type contains the type of action.
1327 * Return 0 if permission is granted.
1328 * @settime:
1329 * Check permission to change the system time.
1330 * struct timespec and timezone are defined in include/linux/time.h
1331 * @ts contains new time
1332 * @tz contains new timezone
1333 * Return 0 if permission is granted.
1334 * @vm_enough_memory:
1335 * Check permissions for allocating a new virtual mapping.
1336 * @mm contains the mm struct it is being added to.
1337 * @pages contains the number of pages.
1338 * Return 0 if permission is granted.
1339 *
1340 * @secid_to_secctx:
1341 * Convert secid to security context.
1342 * @secid contains the security ID.
1343 * @secdata contains the pointer that stores the converted security context.
1344 * @secctx_to_secid:
1345 * Convert security context to secid.
1346 * @secid contains the pointer to the generated security ID.
1347 * @secdata contains the security context.
1348 *
1349 * @release_secctx:
1350 * Release the security context.
1351 * @secdata contains the security context.
1352 * @seclen contains the length of the security context.
1353 *
1354 * Security hooks for Audit
1355 *
1356 * @audit_rule_init:
1357 * Allocate and initialize an LSM audit rule structure.
1358 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1359 * @op contains the operator the rule uses.
1360 * @rulestr contains the context where the rule will be applied to.
1361 * @lsmrule contains a pointer to receive the result.
1362 * Return 0 if @lsmrule has been successfully set,
1363 * -EINVAL in case of an invalid rule.
1364 *
1365 * @audit_rule_known:
1366 * Specifies whether given @rule contains any fields related to current LSM.
1367 * @rule contains the audit rule of interest.
1368 * Return 1 in case of relation found, 0 otherwise.
1369 *
1370 * @audit_rule_match:
1371 * Determine if given @secid matches a rule previously approved
1372 * by @audit_rule_known.
1373 * @secid contains the security id in question.
1374 * @field contains the field which relates to current LSM.
1375 * @op contains the operator that will be used for matching.
1376 * @rule points to the audit rule that will be checked against.
1377 * @actx points to the audit context associated with the check.
1378 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1379 *
1380 * @audit_rule_free:
1381 * Deallocate the LSM audit rule structure previously allocated by
1382 * audit_rule_init.
1383 * @rule contains the allocated rule
1384 *
1385 * This is the main security structure.
1386 */
1442 #ifdef CONFIG_SECURITY_PATH
1456 #endif
1490 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1491 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1520 gfp_t gfp);
1593 #ifdef CONFIG_SECURITY_NETWORK
1617 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1634 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1637 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1642 u32 secid);
1652 /* key management security hooks */
1653 #ifdef CONFIG_KEYS
1658 key_perm_t perm);
1665 #ifdef CONFIG_AUDIT
1672 };
1674 /* prototypes */
1679 /* Security operations */
1758 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1759 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1844 };
1847 {
1848 }
1851 {
1852 }
1854 /*
1855 * This is the default capabilities functionality. Most of these functions
1856 * are just stubbed out, but a few must call the proper capable code.
1857 */
1860 {
1862 }
1866 {
1868 }
1871 {
1873 }
1879 {
1881 }
1888 {
1890 }
1893 {
1895 }
1898 {
1905 }
1909 {
1914 SECURITY_CAP_NOAUDIT);
1917 }
1920 {
1922 }
1925 {
1927 }
1931 {
1933 }
1936 {
1938 }
1941 {
1943 }
1946 {
1948 }
1951 {
1954 }
1957 {
1960 }
1963 {
1964 /* If current->mm is a kernel thread then we will pass NULL,
1965 for this specific case that is fine */
1967 }
1970 {
1972 }
1975 {
1977 }
1980 {
1981 }
1984 {
1985 }
1988 {
1990 }
1993 {
1995 }
1998 { }
2001 {
2003 }
2006 {
2008 }
2012 {
2014 }
2017 {
2019 }
2024 {
2026 }
2030 {
2032 }
2035 {
2037 }
2040 { }
2043 { }
2047 { }
2051 { }
2055 {
2057 }
2061 { }
2065 {
2067 }
2071 { }
2074 {
2076 }
2079 {
2081 }
2084 { }
2091 {
2093 }
2098 {
2100 }
2105 {
2107 }
2111 {
2113 }
2118 {
2120 }
2125 {
2127 }
2131 {
2133 }
2138 {
2140 }
2146 {
2148 }
2151 {
2153 }
2157 {
2159 }
2162 {
2164 }
2168 {
2170 }
2174 {
2176 }
2179 { }
2183 {
2185 }
2189 { }
2193 {
2195 }
2198 {
2200 }
2204 {
2206 }
2209 {
2211 }
2214 {
2216 }
2218 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2219 {
2221 }
2223 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2224 {
2226 }
2228 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2229 {
2231 }
2234 {
2236 }
2239 {
2241 }
2244 {
2246 }
2249 { }
2253 {
2255 }
2262 {
2264 }
2269 {
2271 }
2274 {
2276 }
2280 {
2282 }
2285 {
2287 }
2292 {
2294 }
2297 {
2299 }
2303 {
2305 }
2308 {
2310 }
2313 { }
2316 { }
2320 gfp_t gfp)
2321 {
2323 }
2327 {
2328 }
2332 {
2333 }
2336 {
2338 }
2342 {
2344 }
2347 {
2349 }
2353 {
2355 }
2360 {
2362 }
2366 {
2368 }
2371 {
2373 }
2376 {
2378 }
2381 {
2383 }
2386 {
2388 }
2391 {
2393 }
2396 {
2398 }
2401 {
2403 }
2406 {
2408 }
2412 {
2414 }
2419 {
2421 }
2424 {
2426 }
2429 {
2431 }
2435 u32 secid)
2436 {
2438 }
2441 {
2443 }
2449 {
2451 }
2454 { }
2458 {
2460 }
2463 {
2465 }
2468 {
2470 }
2473 { }
2476 {
2478 }
2481 { }
2485 {
2487 }
2490 {
2492 }
2496 {
2498 }
2504 {
2506 }
2509 {
2511 }
2514 { }
2518 {
2520 }
2523 {
2525 }
2529 {
2531 }
2534 {
2536 }
2539 { }
2542 {
2544 }
2547 {
2549 }
2554 {
2556 }
2559 { }
2562 {
2564 }
2566 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2567 {
2569 }
2572 {
2574 }
2577 {
2579 }
2582 {
2584 }
2587 u32 seclen,
2589 {
2591 }
2594 {
2595 }
2598 #ifdef CONFIG_SECURITY_NETWORK
2642 {
2644 }
2648 {
2650 }
2654 {
2656 }
2662 {
2664 }
2669 {
2671 }
2676 {
2678 }
2681 {
2683 }
2687 {
2689 }
2693 {
2695 }
2700 {
2702 }
2705 {
2707 }
2710 {
2712 }
2716 {
2718 }
2722 {
2724 }
2727 {
2729 }
2732 {
2734 }
2738 {
2740 }
2742 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2743 {
2745 }
2748 {
2750 }
2753 {
2754 }
2757 {
2758 }
2761 {
2762 }
2764 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2765 {
2766 }
2769 {
2770 }
2774 {
2776 }
2780 {
2781 }
2785 {
2786 }
2789 {
2791 }
2794 {
2795 }
2798 {
2800 }
2803 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2822 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2823 {
2825 }
2827 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2828 {
2830 }
2833 {
2834 }
2837 {
2839 }
2843 {
2845 }
2849 {
2851 }
2854 {
2855 }
2858 {
2860 }
2863 {
2865 }
2869 {
2871 }
2874 {
2876 }
2879 {
2880 }
2884 #ifdef CONFIG_SECURITY_PATH
2900 {
2902 }
2906 {
2908 }
2911 {
2913 }
2917 {
2919 }
2923 {
2925 }
2929 {
2931 }
2936 {
2938 }
2944 {
2946 }
2949 #ifdef CONFIG_KEYS
2950 #ifdef CONFIG_SECURITY
2961 #else
2966 {
2968 }
2971 {
2972 }
2976 key_perm_t perm)
2977 {
2979 }
2982 {
2985 }
2991 #endif
2994 #ifdef CONFIG_AUDIT
2995 #ifdef CONFIG_SECURITY
3002 #else
3006 {
3008 }
3011 {
3013 }
3017 {
3019 }
3022 { }
3027 #ifdef CONFIG_SECURITYFS
3039 {
3041 }
3044 mode_t mode,
3048 {
3050 }
3053 {}
3055 #endif
3057 #ifdef CONFIG_SECURITY
3060 {
3062 }
3065 {
3067 }
3069 #else
3072 {
3074 }
3077 { }