| blob | 233d20b52c1b2506debd5a0585f9a7810329c9fd |
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 #ifdef CONFIG_MMU
103 #else
104 #define dac_mmap_min_addr 0UL
105 #endif
107 /*
108 * Values used in the task_security_ops calls
109 */
110 /* setuid or setgid, id0 == uid or gid */
111 #define LSM_SETID_ID 1
113 /* setreuid or setregid, id0 == real, id1 == eff */
114 #define LSM_SETID_RE 2
116 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
117 #define LSM_SETID_RES 4
119 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
120 #define LSM_SETID_FS 8
122 /* forward declares to avoid warnings */
126 /* bprm->unsafe reasons */
127 #define LSM_UNSAFE_SHARE 1
128 #define LSM_UNSAFE_PTRACE 2
129 #define LSM_UNSAFE_PTRACE_CAP 4
131 #ifdef CONFIG_MMU
132 /*
133 * If a hint addr is less than mmap_min_addr change hint to be as
134 * low as possible but still greater than mmap_min_addr
135 */
137 {
143 }
146 #endif
148 #ifdef CONFIG_SECURITY
154 };
157 {
161 }
164 {
174 }
176 /**
177 * struct security_operations - main security structure
178 *
179 * Security module identifier.
180 *
181 * @name:
182 * A string that acts as a unique identifeir for the LSM with max number
183 * of characters = SECURITY_NAME_MAX.
184 *
185 * Security hooks for program execution operations.
186 *
187 * @bprm_set_creds:
188 * Save security information in the bprm->security field, typically based
189 * on information about the bprm->file, for later use by the apply_creds
190 * hook. This hook may also optionally check permissions (e.g. for
191 * transitions between security domains).
192 * This hook may be called multiple times during a single execve, e.g. for
193 * interpreters. The hook can tell whether it has already been called by
194 * checking to see if @bprm->security is non-NULL. If so, then the hook
195 * may decide either to retain the security information saved earlier or
196 * to replace it.
197 * @bprm contains the linux_binprm structure.
198 * Return 0 if the hook is successful and permission is granted.
199 * @bprm_check_security:
200 * This hook mediates the point when a search for a binary handler will
201 * begin. It allows a check the @bprm->security value which is set in the
202 * preceding set_creds call. The primary difference from set_creds is
203 * that the argv list and envp list are reliably available in @bprm. This
204 * hook may be called multiple times during a single execve; and in each
205 * pass set_creds is called first.
206 * @bprm contains the linux_binprm structure.
207 * Return 0 if the hook is successful and permission is granted.
208 * @bprm_committing_creds:
209 * Prepare to install the new security attributes of a process being
210 * transformed by an execve operation, based on the old credentials
211 * pointed to by @current->cred and the information set in @bprm->cred by
212 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
213 * This hook is a good place to perform state changes on the process such
214 * as closing open file descriptors to which access will no longer be
215 * granted when the attributes are changed. This is called immediately
216 * before commit_creds().
217 * @bprm_committed_creds:
218 * Tidy up after the installation of the new security attributes of a
219 * process being transformed by an execve operation. The new credentials
220 * have, by this point, been set to @current->cred. @bprm points to the
221 * linux_binprm structure. This hook is a good place to perform state
222 * changes on the process such as clearing out non-inheritable signal
223 * state. This is called immediately after commit_creds().
224 * @bprm_secureexec:
225 * Return a boolean value (0 or 1) indicating whether a "secure exec"
226 * is required. The flag is passed in the auxiliary table
227 * on the initial stack to the ELF interpreter to indicate whether libc
228 * should enable secure mode.
229 * @bprm contains the linux_binprm structure.
230 *
231 * Security hooks for filesystem operations.
232 *
233 * @sb_alloc_security:
234 * Allocate and attach a security structure to the sb->s_security field.
235 * The s_security field is initialized to NULL when the structure is
236 * allocated.
237 * @sb contains the super_block structure to be modified.
238 * Return 0 if operation was successful.
239 * @sb_free_security:
240 * Deallocate and clear the sb->s_security field.
241 * @sb contains the super_block structure to be modified.
242 * @sb_statfs:
243 * Check permission before obtaining filesystem statistics for the @mnt
244 * mountpoint.
245 * @dentry is a handle on the superblock for the filesystem.
246 * Return 0 if permission is granted.
247 * @sb_mount:
248 * Check permission before an object specified by @dev_name is mounted on
249 * the mount point named by @nd. For an ordinary mount, @dev_name
250 * identifies a device if the file system type requires a device. For a
251 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
252 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
253 * pathname of the object being mounted.
254 * @dev_name contains the name for object being mounted.
255 * @path contains the path for mount point object.
256 * @type contains the filesystem type.
257 * @flags contains the mount flags.
258 * @data contains the filesystem-specific data.
259 * Return 0 if permission is granted.
260 * @sb_copy_data:
261 * Allow mount option data to be copied prior to parsing by the filesystem,
262 * so that the security module can extract security-specific mount
263 * options cleanly (a filesystem may modify the data e.g. with strsep()).
264 * This also allows the original mount data to be stripped of security-
265 * specific options to avoid having to make filesystems aware of them.
266 * @type the type of filesystem being mounted.
267 * @orig the original mount data copied from userspace.
268 * @copy copied data which will be passed to the security module.
269 * Returns 0 if the copy was successful.
270 * @sb_check_sb:
271 * Check permission before the device with superblock @mnt->sb is mounted
272 * on the mount point named by @nd.
273 * @mnt contains the vfsmount for device being mounted.
274 * @path contains the path for the mount point.
275 * Return 0 if permission is granted.
276 * @sb_umount:
277 * Check permission before the @mnt file system is unmounted.
278 * @mnt contains the mounted file system.
279 * @flags contains the unmount flags, e.g. MNT_FORCE.
280 * Return 0 if permission is granted.
281 * @sb_umount_close:
282 * Close any files in the @mnt mounted filesystem that are held open by
283 * the security module. This hook is called during an umount operation
284 * prior to checking whether the filesystem is still busy.
285 * @mnt contains the mounted filesystem.
286 * @sb_umount_busy:
287 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
288 * any files that were closed by umount_close. This hook is called during
289 * an umount operation if the umount fails after a call to the
290 * umount_close hook.
291 * @mnt contains the mounted filesystem.
292 * @sb_post_remount:
293 * Update the security module's state when a filesystem is remounted.
294 * This hook is only called if the remount was successful.
295 * @mnt contains the mounted file system.
296 * @flags contains the new filesystem flags.
297 * @data contains the filesystem-specific data.
298 * @sb_post_addmount:
299 * Update the security module's state when a filesystem is mounted.
300 * This hook is called any time a mount is successfully grafetd to
301 * the tree.
302 * @mnt contains the mounted filesystem.
303 * @mountpoint contains the path for the mount point.
304 * @sb_pivotroot:
305 * Check permission before pivoting the root filesystem.
306 * @old_path contains the path for the new location of the current root (put_old).
307 * @new_path contains the path for the new root (new_root).
308 * Return 0 if permission is granted.
309 * @sb_post_pivotroot:
310 * Update module state after a successful pivot.
311 * @old_path contains the path for the old root.
312 * @new_path contains the path for the new root.
313 * @sb_set_mnt_opts:
314 * Set the security relevant mount options used for a superblock
315 * @sb the superblock to set security mount options for
316 * @opts binary data structure containing all lsm mount data
317 * @sb_clone_mnt_opts:
318 * Copy all security options from a given superblock to another
319 * @oldsb old superblock which contain information to clone
320 * @newsb new superblock which needs filled in
321 * @sb_parse_opts_str:
322 * Parse a string of security data filling in the opts structure
323 * @options string containing all mount options known by the LSM
324 * @opts binary data structure usable by the LSM
325 *
326 * Security hooks for inode operations.
327 *
328 * @inode_alloc_security:
329 * Allocate and attach a security structure to @inode->i_security. The
330 * i_security field is initialized to NULL when the inode structure is
331 * allocated.
332 * @inode contains the inode structure.
333 * Return 0 if operation was successful.
334 * @inode_free_security:
335 * @inode contains the inode structure.
336 * Deallocate the inode security structure and set @inode->i_security to
337 * NULL.
338 * @inode_init_security:
339 * Obtain the security attribute name suffix and value to set on a newly
340 * created inode and set up the incore security field for the new inode.
341 * This hook is called by the fs code as part of the inode creation
342 * transaction and provides for atomic labeling of the inode, unlike
343 * the post_create/mkdir/... hooks called by the VFS. The hook function
344 * is expected to allocate the name and value via kmalloc, with the caller
345 * being responsible for calling kfree after using them.
346 * If the security module does not use security attributes or does
347 * not wish to put a security attribute on this particular inode,
348 * then it should return -EOPNOTSUPP to skip this processing.
349 * @inode contains the inode structure of the newly created inode.
350 * @dir contains the inode structure of the parent directory.
351 * @name will be set to the allocated name suffix (e.g. selinux).
352 * @value will be set to the allocated attribute value.
353 * @len will be set to the length of the value.
354 * Returns 0 if @name and @value have been successfully set,
355 * -EOPNOTSUPP if no security attribute is needed, or
356 * -ENOMEM on memory allocation failure.
357 * @inode_create:
358 * Check permission to create a regular file.
359 * @dir contains inode structure of the parent of the new file.
360 * @dentry contains the dentry structure for the file to be created.
361 * @mode contains the file mode of the file to be created.
362 * Return 0 if permission is granted.
363 * @inode_link:
364 * Check permission before creating a new hard link to a file.
365 * @old_dentry contains the dentry structure for an existing link to the file.
366 * @dir contains the inode structure of the parent directory of the new link.
367 * @new_dentry contains the dentry structure for the new link.
368 * Return 0 if permission is granted.
369 * @path_link:
370 * Check permission before creating a new hard link to a file.
371 * @old_dentry contains the dentry structure for an existing link
372 * to the file.
373 * @new_dir contains the path structure of the parent directory of
374 * the new link.
375 * @new_dentry contains the dentry structure for the new link.
376 * Return 0 if permission is granted.
377 * @inode_unlink:
378 * Check the permission to remove a hard link to a file.
379 * @dir contains the inode structure of parent directory of the file.
380 * @dentry contains the dentry structure for file to be unlinked.
381 * Return 0 if permission is granted.
382 * @path_unlink:
383 * Check the permission to remove a hard link to a file.
384 * @dir contains the path structure of parent directory of the file.
385 * @dentry contains the dentry structure for file to be unlinked.
386 * Return 0 if permission is granted.
387 * @inode_symlink:
388 * Check the permission to create a symbolic link to a file.
389 * @dir contains the inode structure of parent directory of the symbolic link.
390 * @dentry contains the dentry structure of the symbolic link.
391 * @old_name contains the pathname of file.
392 * Return 0 if permission is granted.
393 * @path_symlink:
394 * Check the permission to create a symbolic link to a file.
395 * @dir contains the path structure of parent directory of
396 * the symbolic link.
397 * @dentry contains the dentry structure of the symbolic link.
398 * @old_name contains the pathname of file.
399 * Return 0 if permission is granted.
400 * @inode_mkdir:
401 * Check permissions to create a new directory in the existing directory
402 * associated with inode strcture @dir.
403 * @dir containst the inode structure of parent of the directory to be created.
404 * @dentry contains the dentry structure of new directory.
405 * @mode contains the mode of new directory.
406 * Return 0 if permission is granted.
407 * @path_mkdir:
408 * Check permissions to create a new directory in the existing directory
409 * associated with path strcture @path.
410 * @dir containst the path structure of parent of the directory
411 * to be created.
412 * @dentry contains the dentry structure of new directory.
413 * @mode contains the mode of new directory.
414 * Return 0 if permission is granted.
415 * @inode_rmdir:
416 * Check the permission to remove a directory.
417 * @dir contains the inode structure of parent of the directory to be removed.
418 * @dentry contains the dentry structure of directory to be removed.
419 * Return 0 if permission is granted.
420 * @path_rmdir:
421 * Check the permission to remove a directory.
422 * @dir contains the path structure of parent of the directory to be
423 * removed.
424 * @dentry contains the dentry structure of directory to be removed.
425 * Return 0 if permission is granted.
426 * @inode_mknod:
427 * Check permissions when creating a special file (or a socket or a fifo
428 * file created via the mknod system call). Note that if mknod operation
429 * is being done for a regular file, then the create hook will be called
430 * and not this hook.
431 * @dir contains the inode structure of parent of the new file.
432 * @dentry contains the dentry structure of the new file.
433 * @mode contains the mode of the new file.
434 * @dev contains the device number.
435 * Return 0 if permission is granted.
436 * @path_mknod:
437 * Check permissions when creating a file. Note that this hook is called
438 * even if mknod operation is being done for a regular file.
439 * @dir contains the path structure of parent of the new file.
440 * @dentry contains the dentry structure of the new file.
441 * @mode contains the mode of the new file.
442 * @dev contains the undecoded device number. Use new_decode_dev() to get
443 * the decoded device number.
444 * Return 0 if permission is granted.
445 * @inode_rename:
446 * Check for permission to rename a file or directory.
447 * @old_dir contains the inode structure for parent of the old link.
448 * @old_dentry contains the dentry structure of the old link.
449 * @new_dir contains the inode structure for parent of the new link.
450 * @new_dentry contains the dentry structure of the new link.
451 * Return 0 if permission is granted.
452 * @path_rename:
453 * Check for permission to rename a file or directory.
454 * @old_dir contains the path structure for parent of the old link.
455 * @old_dentry contains the dentry structure of the old link.
456 * @new_dir contains the path structure for parent of the new link.
457 * @new_dentry contains the dentry structure of the new link.
458 * Return 0 if permission is granted.
459 * @path_chmod:
460 * Check for permission to change DAC's permission of a file or directory.
461 * @dentry contains the dentry structure.
462 * @mnt contains the vfsmnt structure.
463 * @mode contains DAC's mode.
464 * Return 0 if permission is granted.
465 * @path_chown:
466 * Check for permission to change owner/group of a file or directory.
467 * @path contains the path structure.
468 * @uid contains new owner's ID.
469 * @gid contains new group's ID.
470 * Return 0 if permission is granted.
471 * @path_chroot:
472 * Check for permission to change root directory.
473 * @path contains the path structure.
474 * Return 0 if permission is granted.
475 * @inode_readlink:
476 * Check the permission to read the symbolic link.
477 * @dentry contains the dentry structure for the file link.
478 * Return 0 if permission is granted.
479 * @inode_follow_link:
480 * Check permission to follow a symbolic link when looking up a pathname.
481 * @dentry contains the dentry structure for the link.
482 * @nd contains the nameidata structure for the parent directory.
483 * Return 0 if permission is granted.
484 * @inode_permission:
485 * Check permission before accessing an inode. This hook is called by the
486 * existing Linux permission function, so a security module can use it to
487 * provide additional checking for existing Linux permission checks.
488 * Notice that this hook is called when a file is opened (as well as many
489 * other operations), whereas the file_security_ops permission hook is
490 * called when the actual read/write operations are performed.
491 * @inode contains the inode structure to check.
492 * @mask contains the permission mask.
493 * @nd contains the nameidata (may be NULL).
494 * Return 0 if permission is granted.
495 * @inode_setattr:
496 * Check permission before setting file attributes. Note that the kernel
497 * call to notify_change is performed from several locations, whenever
498 * file attributes change (such as when a file is truncated, chown/chmod
499 * operations, transferring disk quotas, etc).
500 * @dentry contains the dentry structure for the file.
501 * @attr is the iattr structure containing the new file attributes.
502 * Return 0 if permission is granted.
503 * @path_truncate:
504 * Check permission before truncating a file.
505 * @path contains the path structure for the file.
506 * @length is the new length of the file.
507 * @time_attrs is the flags passed to do_truncate().
508 * Return 0 if permission is granted.
509 * @inode_getattr:
510 * Check permission before obtaining file attributes.
511 * @mnt is the vfsmount where the dentry was looked up
512 * @dentry contains the dentry structure for the file.
513 * Return 0 if permission is granted.
514 * @inode_delete:
515 * @inode contains the inode structure for deleted inode.
516 * This hook is called when a deleted inode is released (i.e. an inode
517 * with no hard links has its use count drop to zero). A security module
518 * can use this hook to release any persistent label associated with the
519 * inode.
520 * @inode_setxattr:
521 * Check permission before setting the extended attributes
522 * @value identified by @name for @dentry.
523 * Return 0 if permission is granted.
524 * @inode_post_setxattr:
525 * Update inode security field after successful setxattr operation.
526 * @value identified by @name for @dentry.
527 * @inode_getxattr:
528 * Check permission before obtaining the extended attributes
529 * identified by @name for @dentry.
530 * Return 0 if permission is granted.
531 * @inode_listxattr:
532 * Check permission before obtaining the list of extended attribute
533 * names for @dentry.
534 * Return 0 if permission is granted.
535 * @inode_removexattr:
536 * Check permission before removing the extended attribute
537 * identified by @name for @dentry.
538 * Return 0 if permission is granted.
539 * @inode_getsecurity:
540 * Retrieve a copy of the extended attribute representation of the
541 * security label associated with @name for @inode via @buffer. Note that
542 * @name is the remainder of the attribute name after the security prefix
543 * has been removed. @alloc is used to specify of the call should return a
544 * value via the buffer or just the value length Return size of buffer on
545 * success.
546 * @inode_setsecurity:
547 * Set the security label associated with @name for @inode from the
548 * extended attribute value @value. @size indicates the size of the
549 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
550 * Note that @name is the remainder of the attribute name after the
551 * security. prefix has been removed.
552 * Return 0 on success.
553 * @inode_listsecurity:
554 * Copy the extended attribute names for the security labels
555 * associated with @inode into @buffer. The maximum size of @buffer
556 * is specified by @buffer_size. @buffer may be NULL to request
557 * the size of the buffer required.
558 * Returns number of bytes used/required on success.
559 * @inode_need_killpriv:
560 * Called when an inode has been changed.
561 * @dentry is the dentry being changed.
562 * Return <0 on error to abort the inode change operation.
563 * Return 0 if inode_killpriv does not need to be called.
564 * Return >0 if inode_killpriv does need to be called.
565 * @inode_killpriv:
566 * The setuid bit is being removed. Remove similar security labels.
567 * Called with the dentry->d_inode->i_mutex held.
568 * @dentry is the dentry being changed.
569 * Return 0 on success. If error is returned, then the operation
570 * causing setuid bit removal is failed.
571 * @inode_getsecid:
572 * Get the secid associated with the node.
573 * @inode contains a pointer to the inode.
574 * @secid contains a pointer to the location where result will be saved.
575 * In case of failure, @secid will be set to zero.
576 *
577 * Security hooks for file operations
578 *
579 * @file_permission:
580 * Check file permissions before accessing an open file. This hook is
581 * called by various operations that read or write files. A security
582 * module can use this hook to perform additional checking on these
583 * operations, e.g. to revalidate permissions on use to support privilege
584 * bracketing or policy changes. Notice that this hook is used when the
585 * actual read/write operations are performed, whereas the
586 * inode_security_ops hook is called when a file is opened (as well as
587 * many other operations).
588 * Caveat: Although this hook can be used to revalidate permissions for
589 * various system call operations that read or write files, it does not
590 * address the revalidation of permissions for memory-mapped files.
591 * Security modules must handle this separately if they need such
592 * revalidation.
593 * @file contains the file structure being accessed.
594 * @mask contains the requested permissions.
595 * Return 0 if permission is granted.
596 * @file_alloc_security:
597 * Allocate and attach a security structure to the file->f_security field.
598 * The security field is initialized to NULL when the structure is first
599 * created.
600 * @file contains the file structure to secure.
601 * Return 0 if the hook is successful and permission is granted.
602 * @file_free_security:
603 * Deallocate and free any security structures stored in file->f_security.
604 * @file contains the file structure being modified.
605 * @file_ioctl:
606 * @file contains the file structure.
607 * @cmd contains the operation to perform.
608 * @arg contains the operational arguments.
609 * Check permission for an ioctl operation on @file. Note that @arg can
610 * sometimes represents a user space pointer; in other cases, it may be a
611 * simple integer value. When @arg represents a user space pointer, it
612 * should never be used by the security module.
613 * Return 0 if permission is granted.
614 * @file_mmap :
615 * Check permissions for a mmap operation. The @file may be NULL, e.g.
616 * if mapping anonymous memory.
617 * @file contains the file structure for file to map (may be NULL).
618 * @reqprot contains the protection requested by the application.
619 * @prot contains the protection that will be applied by the kernel.
620 * @flags contains the operational flags.
621 * Return 0 if permission is granted.
622 * @file_mprotect:
623 * Check permissions before changing memory access permissions.
624 * @vma contains the memory region to modify.
625 * @reqprot contains the protection requested by the application.
626 * @prot contains the protection that will be applied by the kernel.
627 * Return 0 if permission is granted.
628 * @file_lock:
629 * Check permission before performing file locking operations.
630 * Note: this hook mediates both flock and fcntl style locks.
631 * @file contains the file structure.
632 * @cmd contains the posix-translated lock operation to perform
633 * (e.g. F_RDLCK, F_WRLCK).
634 * Return 0 if permission is granted.
635 * @file_fcntl:
636 * Check permission before allowing the file operation specified by @cmd
637 * from being performed on the file @file. Note that @arg can sometimes
638 * represents a user space pointer; in other cases, it may be a simple
639 * integer value. When @arg represents a user space pointer, it should
640 * never be used by the security module.
641 * @file contains the file structure.
642 * @cmd contains the operation to be performed.
643 * @arg contains the operational arguments.
644 * Return 0 if permission is granted.
645 * @file_set_fowner:
646 * Save owner security information (typically from current->security) in
647 * file->f_security for later use by the send_sigiotask hook.
648 * @file contains the file structure to update.
649 * Return 0 on success.
650 * @file_send_sigiotask:
651 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
652 * process @tsk. Note that this hook is sometimes called from interrupt.
653 * Note that the fown_struct, @fown, is never outside the context of a
654 * struct file, so the file structure (and associated security information)
655 * can always be obtained:
656 * container_of(fown, struct file, f_owner)
657 * @tsk contains the structure of task receiving signal.
658 * @fown contains the file owner information.
659 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
660 * Return 0 if permission is granted.
661 * @file_receive:
662 * This hook allows security modules to control the ability of a process
663 * to receive an open file descriptor via socket IPC.
664 * @file contains the file structure being received.
665 * Return 0 if permission is granted.
666 *
667 * Security hook for dentry
668 *
669 * @dentry_open
670 * Save open-time permission checking state for later use upon
671 * file_permission, and recheck access if anything has changed
672 * since inode_permission.
673 *
674 * Security hooks for task operations.
675 *
676 * @task_create:
677 * Check permission before creating a child process. See the clone(2)
678 * manual page for definitions of the @clone_flags.
679 * @clone_flags contains the flags indicating what should be shared.
680 * Return 0 if permission is granted.
681 * @cred_alloc_blank:
682 * @cred points to the credentials.
683 * @gfp indicates the atomicity of any memory allocations.
684 * Only allocate sufficient memory and attach to @cred such that
685 * cred_transfer() will not get ENOMEM.
686 * @cred_free:
687 * @cred points to the credentials.
688 * Deallocate and clear the cred->security field in a set of credentials.
689 * @cred_prepare:
690 * @new points to the new credentials.
691 * @old points to the original credentials.
692 * @gfp indicates the atomicity of any memory allocations.
693 * Prepare a new set of credentials by copying the data from the old set.
694 * @cred_commit:
695 * @new points to the new credentials.
696 * @old points to the original credentials.
697 * Install a new set of credentials.
698 * @cred_transfer:
699 * @new points to the new credentials.
700 * @old points to the original credentials.
701 * Transfer data from original creds to new creds
702 * @kernel_act_as:
703 * Set the credentials for a kernel service to act as (subjective context).
704 * @new points to the credentials to be modified.
705 * @secid specifies the security ID to be set
706 * The current task must be the one that nominated @secid.
707 * Return 0 if successful.
708 * @kernel_create_files_as:
709 * Set the file creation context in a set of credentials to be the same as
710 * the objective context of the specified inode.
711 * @new points to the credentials to be modified.
712 * @inode points to the inode to use as a reference.
713 * The current task must be the one that nominated @inode.
714 * Return 0 if successful.
715 * @kernel_module_request:
716 * Ability to trigger the kernel to automatically upcall to userspace for
717 * userspace to load a kernel module with the given name.
718 * @kmod_name name of the module requested by the kernel
719 * Return 0 if successful.
720 * @task_setuid:
721 * Check permission before setting one or more of the user identity
722 * attributes of the current process. The @flags parameter indicates
723 * which of the set*uid system calls invoked this hook and how to
724 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
725 * definitions at the beginning of this file for the @flags values and
726 * their meanings.
727 * @id0 contains a uid.
728 * @id1 contains a uid.
729 * @id2 contains a uid.
730 * @flags contains one of the LSM_SETID_* values.
731 * Return 0 if permission is granted.
732 * @task_fix_setuid:
733 * Update the module's state after setting one or more of the user
734 * identity attributes of the current process. The @flags parameter
735 * indicates which of the set*uid system calls invoked this hook. If
736 * @new is the set of credentials that will be installed. Modifications
737 * should be made to this rather than to @current->cred.
738 * @old is the set of credentials that are being replaces
739 * @flags contains one of the LSM_SETID_* values.
740 * Return 0 on success.
741 * @task_setgid:
742 * Check permission before setting one or more of the group identity
743 * attributes of the current process. The @flags parameter indicates
744 * which of the set*gid system calls invoked this hook and how to
745 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
746 * definitions at the beginning of this file for the @flags values and
747 * their meanings.
748 * @id0 contains a gid.
749 * @id1 contains a gid.
750 * @id2 contains a gid.
751 * @flags contains one of the LSM_SETID_* values.
752 * Return 0 if permission is granted.
753 * @task_setpgid:
754 * Check permission before setting the process group identifier of the
755 * process @p to @pgid.
756 * @p contains the task_struct for process being modified.
757 * @pgid contains the new pgid.
758 * Return 0 if permission is granted.
759 * @task_getpgid:
760 * Check permission before getting the process group identifier of the
761 * process @p.
762 * @p contains the task_struct for the process.
763 * Return 0 if permission is granted.
764 * @task_getsid:
765 * Check permission before getting the session identifier of the process
766 * @p.
767 * @p contains the task_struct for the process.
768 * Return 0 if permission is granted.
769 * @task_getsecid:
770 * Retrieve the security identifier of the process @p.
771 * @p contains the task_struct for the process and place is into @secid.
772 * In case of failure, @secid will be set to zero.
773 *
774 * @task_setgroups:
775 * Check permission before setting the supplementary group set of the
776 * current process.
777 * @group_info contains the new group information.
778 * Return 0 if permission is granted.
779 * @task_setnice:
780 * Check permission before setting the nice value of @p to @nice.
781 * @p contains the task_struct of process.
782 * @nice contains the new nice value.
783 * Return 0 if permission is granted.
784 * @task_setioprio
785 * Check permission before setting the ioprio value of @p to @ioprio.
786 * @p contains the task_struct of process.
787 * @ioprio contains the new ioprio value
788 * Return 0 if permission is granted.
789 * @task_getioprio
790 * Check permission before getting the ioprio value of @p.
791 * @p contains the task_struct of process.
792 * Return 0 if permission is granted.
793 * @task_setrlimit:
794 * Check permission before setting the resource limits of the current
795 * process for @resource to @new_rlim. The old resource limit values can
796 * be examined by dereferencing (current->signal->rlim + resource).
797 * @resource contains the resource whose limit is being set.
798 * @new_rlim contains the new limits for @resource.
799 * Return 0 if permission is granted.
800 * @task_setscheduler:
801 * Check permission before setting scheduling policy and/or parameters of
802 * process @p based on @policy and @lp.
803 * @p contains the task_struct for process.
804 * @policy contains the scheduling policy.
805 * @lp contains the scheduling parameters.
806 * Return 0 if permission is granted.
807 * @task_getscheduler:
808 * Check permission before obtaining scheduling information for process
809 * @p.
810 * @p contains the task_struct for process.
811 * Return 0 if permission is granted.
812 * @task_movememory
813 * Check permission before moving memory owned by process @p.
814 * @p contains the task_struct for process.
815 * Return 0 if permission is granted.
816 * @task_kill:
817 * Check permission before sending signal @sig to @p. @info can be NULL,
818 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
819 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
820 * from the kernel and should typically be permitted.
821 * SIGIO signals are handled separately by the send_sigiotask hook in
822 * file_security_ops.
823 * @p contains the task_struct for process.
824 * @info contains the signal information.
825 * @sig contains the signal value.
826 * @secid contains the sid of the process where the signal originated
827 * Return 0 if permission is granted.
828 * @task_wait:
829 * Check permission before allowing a process to reap a child process @p
830 * and collect its status information.
831 * @p contains the task_struct for process.
832 * Return 0 if permission is granted.
833 * @task_prctl:
834 * Check permission before performing a process control operation on the
835 * current process.
836 * @option contains the operation.
837 * @arg2 contains a argument.
838 * @arg3 contains a argument.
839 * @arg4 contains a argument.
840 * @arg5 contains a argument.
841 * Return -ENOSYS if no-one wanted to handle this op, any other value to
842 * cause prctl() to return immediately with that value.
843 * @task_to_inode:
844 * Set the security attributes for an inode based on an associated task's
845 * security attributes, e.g. for /proc/pid inodes.
846 * @p contains the task_struct for the task.
847 * @inode contains the inode structure for the inode.
848 *
849 * Security hooks for Netlink messaging.
850 *
851 * @netlink_send:
852 * Save security information for a netlink message so that permission
853 * checking can be performed when the message is processed. The security
854 * information can be saved using the eff_cap field of the
855 * netlink_skb_parms structure. Also may be used to provide fine
856 * grained control over message transmission.
857 * @sk associated sock of task sending the message.,
858 * @skb contains the sk_buff structure for the netlink message.
859 * Return 0 if the information was successfully saved and message
860 * is allowed to be transmitted.
861 * @netlink_recv:
862 * Check permission before processing the received netlink message in
863 * @skb.
864 * @skb contains the sk_buff structure for the netlink message.
865 * @cap indicates the capability required
866 * Return 0 if permission is granted.
867 *
868 * Security hooks for Unix domain networking.
869 *
870 * @unix_stream_connect:
871 * Check permissions before establishing a Unix domain stream connection
872 * between @sock and @other.
873 * @sock contains the socket structure.
874 * @other contains the peer socket structure.
875 * Return 0 if permission is granted.
876 * @unix_may_send:
877 * Check permissions before connecting or sending datagrams from @sock to
878 * @other.
879 * @sock contains the socket structure.
880 * @sock contains the peer socket structure.
881 * Return 0 if permission is granted.
882 *
883 * The @unix_stream_connect and @unix_may_send hooks were necessary because
884 * Linux provides an alternative to the conventional file name space for Unix
885 * domain sockets. Whereas binding and connecting to sockets in the file name
886 * space is mediated by the typical file permissions (and caught by the mknod
887 * and permission hooks in inode_security_ops), binding and connecting to
888 * sockets in the abstract name space is completely unmediated. Sufficient
889 * control of Unix domain sockets in the abstract name space isn't possible
890 * using only the socket layer hooks, since we need to know the actual target
891 * socket, which is not looked up until we are inside the af_unix code.
892 *
893 * Security hooks for socket operations.
894 *
895 * @socket_create:
896 * Check permissions prior to creating a new socket.
897 * @family contains the requested protocol family.
898 * @type contains the requested communications type.
899 * @protocol contains the requested protocol.
900 * @kern set to 1 if a kernel socket.
901 * Return 0 if permission is granted.
902 * @socket_post_create:
903 * This hook allows a module to update or allocate a per-socket security
904 * structure. Note that the security field was not added directly to the
905 * socket structure, but rather, the socket security information is stored
906 * in the associated inode. Typically, the inode alloc_security hook will
907 * allocate and and attach security information to
908 * sock->inode->i_security. This hook may be used to update the
909 * sock->inode->i_security field with additional information that wasn't
910 * available when the inode was allocated.
911 * @sock contains the newly created socket structure.
912 * @family contains the requested protocol family.
913 * @type contains the requested communications type.
914 * @protocol contains the requested protocol.
915 * @kern set to 1 if a kernel socket.
916 * @socket_bind:
917 * Check permission before socket protocol layer bind operation is
918 * performed and the socket @sock is bound to the address specified in the
919 * @address parameter.
920 * @sock contains the socket structure.
921 * @address contains the address to bind to.
922 * @addrlen contains the length of address.
923 * Return 0 if permission is granted.
924 * @socket_connect:
925 * Check permission before socket protocol layer connect operation
926 * attempts to connect socket @sock to a remote address, @address.
927 * @sock contains the socket structure.
928 * @address contains the address of remote endpoint.
929 * @addrlen contains the length of address.
930 * Return 0 if permission is granted.
931 * @socket_listen:
932 * Check permission before socket protocol layer listen operation.
933 * @sock contains the socket structure.
934 * @backlog contains the maximum length for the pending connection queue.
935 * Return 0 if permission is granted.
936 * @socket_accept:
937 * Check permission before accepting a new connection. Note that the new
938 * socket, @newsock, has been created and some information copied to it,
939 * but the accept operation has not actually been performed.
940 * @sock contains the listening socket structure.
941 * @newsock contains the newly created server socket for connection.
942 * Return 0 if permission is granted.
943 * @socket_sendmsg:
944 * Check permission before transmitting a message to another socket.
945 * @sock contains the socket structure.
946 * @msg contains the message to be transmitted.
947 * @size contains the size of message.
948 * Return 0 if permission is granted.
949 * @socket_recvmsg:
950 * Check permission before receiving a message from a socket.
951 * @sock contains the socket structure.
952 * @msg contains the message structure.
953 * @size contains the size of message structure.
954 * @flags contains the operational flags.
955 * Return 0 if permission is granted.
956 * @socket_getsockname:
957 * Check permission before the local address (name) of the socket object
958 * @sock is retrieved.
959 * @sock contains the socket structure.
960 * Return 0 if permission is granted.
961 * @socket_getpeername:
962 * Check permission before the remote address (name) of a socket object
963 * @sock is retrieved.
964 * @sock contains the socket structure.
965 * Return 0 if permission is granted.
966 * @socket_getsockopt:
967 * Check permissions before retrieving the options associated with socket
968 * @sock.
969 * @sock contains the socket structure.
970 * @level contains the protocol level to retrieve option from.
971 * @optname contains the name of option to retrieve.
972 * Return 0 if permission is granted.
973 * @socket_setsockopt:
974 * Check permissions before setting the options associated with socket
975 * @sock.
976 * @sock contains the socket structure.
977 * @level contains the protocol level to set options for.
978 * @optname contains the name of the option to set.
979 * Return 0 if permission is granted.
980 * @socket_shutdown:
981 * Checks permission before all or part of a connection on the socket
982 * @sock is shut down.
983 * @sock contains the socket structure.
984 * @how contains the flag indicating how future sends and receives are handled.
985 * Return 0 if permission is granted.
986 * @socket_sock_rcv_skb:
987 * Check permissions on incoming network packets. This hook is distinct
988 * from Netfilter's IP input hooks since it is the first time that the
989 * incoming sk_buff @skb has been associated with a particular socket, @sk.
990 * Must not sleep inside this hook because some callers hold spinlocks.
991 * @sk contains the sock (not socket) associated with the incoming sk_buff.
992 * @skb contains the incoming network data.
993 * @socket_getpeersec_stream:
994 * This hook allows the security module to provide peer socket security
995 * state for unix or connected tcp sockets to userspace via getsockopt
996 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
997 * socket is associated with an ipsec SA.
998 * @sock is the local socket.
999 * @optval userspace memory where the security state is to be copied.
1000 * @optlen userspace int where the module should copy the actual length
1001 * of the security state.
1002 * @len as input is the maximum length to copy to userspace provided
1003 * by the caller.
1004 * Return 0 if all is well, otherwise, typical getsockopt return
1005 * values.
1006 * @socket_getpeersec_dgram:
1007 * This hook allows the security module to provide peer socket security
1008 * state for udp sockets on a per-packet basis to userspace via
1009 * getsockopt SO_GETPEERSEC. The application must first have indicated
1010 * the IP_PASSSEC option via getsockopt. It can then retrieve the
1011 * security state returned by this hook for a packet via the SCM_SECURITY
1012 * ancillary message type.
1013 * @skb is the skbuff for the packet being queried
1014 * @secdata is a pointer to a buffer in which to copy the security data
1015 * @seclen is the maximum length for @secdata
1016 * Return 0 on success, error on failure.
1017 * @sk_alloc_security:
1018 * Allocate and attach a security structure to the sk->sk_security field,
1019 * which is used to copy security attributes between local stream sockets.
1020 * @sk_free_security:
1021 * Deallocate security structure.
1022 * @sk_clone_security:
1023 * Clone/copy security structure.
1024 * @sk_getsecid:
1025 * Retrieve the LSM-specific secid for the sock to enable caching of network
1026 * authorizations.
1027 * @sock_graft:
1028 * Sets the socket's isec sid to the sock's sid.
1029 * @inet_conn_request:
1030 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
1031 * @inet_csk_clone:
1032 * Sets the new child socket's sid to the openreq sid.
1033 * @inet_conn_established:
1034 * Sets the connection's peersid to the secmark on skb.
1035 * @req_classify_flow:
1036 * Sets the flow's sid to the openreq sid.
1037 * @tun_dev_create:
1038 * Check permissions prior to creating a new TUN device.
1039 * @tun_dev_post_create:
1040 * This hook allows a module to update or allocate a per-socket security
1041 * structure.
1042 * @sk contains the newly created sock structure.
1043 * @tun_dev_attach:
1044 * Check permissions prior to attaching to a persistent TUN device. This
1045 * hook can also be used by the module to update any security state
1046 * associated with the TUN device's sock structure.
1047 * @sk contains the existing sock structure.
1048 *
1049 * Security hooks for XFRM operations.
1050 *
1051 * @xfrm_policy_alloc_security:
1052 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1053 * Database used by the XFRM system.
1054 * @sec_ctx contains the security context information being provided by
1055 * the user-level policy update program (e.g., setkey).
1056 * Allocate a security structure to the xp->security field; the security
1057 * field is initialized to NULL when the xfrm_policy is allocated.
1058 * Return 0 if operation was successful (memory to allocate, legal context)
1059 * @xfrm_policy_clone_security:
1060 * @old_ctx contains an existing xfrm_sec_ctx.
1061 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1062 * Allocate a security structure in new_ctxp that contains the
1063 * information from the old_ctx structure.
1064 * Return 0 if operation was successful (memory to allocate).
1065 * @xfrm_policy_free_security:
1066 * @ctx contains the xfrm_sec_ctx
1067 * Deallocate xp->security.
1068 * @xfrm_policy_delete_security:
1069 * @ctx contains the xfrm_sec_ctx.
1070 * Authorize deletion of xp->security.
1071 * @xfrm_state_alloc_security:
1072 * @x contains the xfrm_state being added to the Security Association
1073 * Database by the XFRM system.
1074 * @sec_ctx contains the security context information being provided by
1075 * the user-level SA generation program (e.g., setkey or racoon).
1076 * @secid contains the secid from which to take the mls portion of the context.
1077 * Allocate a security structure to the x->security field; the security
1078 * field is initialized to NULL when the xfrm_state is allocated. Set the
1079 * context to correspond to either sec_ctx or polsec, with the mls portion
1080 * taken from secid in the latter case.
1081 * Return 0 if operation was successful (memory to allocate, legal context).
1082 * @xfrm_state_free_security:
1083 * @x contains the xfrm_state.
1084 * Deallocate x->security.
1085 * @xfrm_state_delete_security:
1086 * @x contains the xfrm_state.
1087 * Authorize deletion of x->security.
1088 * @xfrm_policy_lookup:
1089 * @ctx contains the xfrm_sec_ctx for which the access control is being
1090 * checked.
1091 * @fl_secid contains the flow security label that is used to authorize
1092 * access to the policy xp.
1093 * @dir contains the direction of the flow (input or output).
1094 * Check permission when a flow selects a xfrm_policy for processing
1095 * XFRMs on a packet. The hook is called when selecting either a
1096 * per-socket policy or a generic xfrm policy.
1097 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1098 * on other errors.
1099 * @xfrm_state_pol_flow_match:
1100 * @x contains the state to match.
1101 * @xp contains the policy to check for a match.
1102 * @fl contains the flow to check for a match.
1103 * Return 1 if there is a match.
1104 * @xfrm_decode_session:
1105 * @skb points to skb to decode.
1106 * @secid points to the flow key secid to set.
1107 * @ckall says if all xfrms used should be checked for same secid.
1108 * Return 0 if ckall is zero or all xfrms used have the same secid.
1109 *
1110 * Security hooks affecting all Key Management operations
1111 *
1112 * @key_alloc:
1113 * Permit allocation of a key and assign security data. Note that key does
1114 * not have a serial number assigned at this point.
1115 * @key points to the key.
1116 * @flags is the allocation flags
1117 * Return 0 if permission is granted, -ve error otherwise.
1118 * @key_free:
1119 * Notification of destruction; free security data.
1120 * @key points to the key.
1121 * No return value.
1122 * @key_permission:
1123 * See whether a specific operational right is granted to a process on a
1124 * key.
1125 * @key_ref refers to the key (key pointer + possession attribute bit).
1126 * @cred points to the credentials to provide the context against which to
1127 * evaluate the security data on the key.
1128 * @perm describes the combination of permissions required of this key.
1129 * Return 1 if permission granted, 0 if permission denied and -ve it the
1130 * normal permissions model should be effected.
1131 * @key_getsecurity:
1132 * Get a textual representation of the security context attached to a key
1133 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1134 * allocates the storage for the NUL-terminated string and the caller
1135 * should free it.
1136 * @key points to the key to be queried.
1137 * @_buffer points to a pointer that should be set to point to the
1138 * resulting string (if no label or an error occurs).
1139 * Return the length of the string (including terminating NUL) or -ve if
1140 * an error.
1141 * May also return 0 (and a NULL buffer pointer) if there is no label.
1142 * @key_session_to_parent:
1143 * Forcibly assign the session keyring from a process to its parent
1144 * process.
1145 * @cred: Pointer to process's credentials
1146 * @parent_cred: Pointer to parent process's credentials
1147 * @keyring: Proposed new session keyring
1148 * Return 0 if permission is granted, -ve error otherwise.
1149 *
1150 * Security hooks affecting all System V IPC operations.
1151 *
1152 * @ipc_permission:
1153 * Check permissions for access to IPC
1154 * @ipcp contains the kernel IPC permission structure
1155 * @flag contains the desired (requested) permission set
1156 * Return 0 if permission is granted.
1157 * @ipc_getsecid:
1158 * Get the secid associated with the ipc object.
1159 * @ipcp contains the kernel IPC permission structure.
1160 * @secid contains a pointer to the location where result will be saved.
1161 * In case of failure, @secid will be set to zero.
1162 *
1163 * Security hooks for individual messages held in System V IPC message queues
1164 * @msg_msg_alloc_security:
1165 * Allocate and attach a security structure to the msg->security field.
1166 * The security field is initialized to NULL when the structure is first
1167 * created.
1168 * @msg contains the message structure to be modified.
1169 * Return 0 if operation was successful and permission is granted.
1170 * @msg_msg_free_security:
1171 * Deallocate the security structure for this message.
1172 * @msg contains the message structure to be modified.
1173 *
1174 * Security hooks for System V IPC Message Queues
1175 *
1176 * @msg_queue_alloc_security:
1177 * Allocate and attach a security structure to the
1178 * msq->q_perm.security field. The security field is initialized to
1179 * NULL when the structure is first created.
1180 * @msq contains the message queue structure to be modified.
1181 * Return 0 if operation was successful and permission is granted.
1182 * @msg_queue_free_security:
1183 * Deallocate security structure for this message queue.
1184 * @msq contains the message queue structure to be modified.
1185 * @msg_queue_associate:
1186 * Check permission when a message queue is requested through the
1187 * msgget system call. This hook is only called when returning the
1188 * message queue identifier for an existing message queue, not when a
1189 * new message queue is created.
1190 * @msq contains the message queue to act upon.
1191 * @msqflg contains the operation control flags.
1192 * Return 0 if permission is granted.
1193 * @msg_queue_msgctl:
1194 * Check permission when a message control operation specified by @cmd
1195 * is to be performed on the message queue @msq.
1196 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1197 * @msq contains the message queue to act upon. May be NULL.
1198 * @cmd contains the operation to be performed.
1199 * Return 0 if permission is granted.
1200 * @msg_queue_msgsnd:
1201 * Check permission before a message, @msg, is enqueued on the message
1202 * queue, @msq.
1203 * @msq contains the message queue to send message to.
1204 * @msg contains the message to be enqueued.
1205 * @msqflg contains operational flags.
1206 * Return 0 if permission is granted.
1207 * @msg_queue_msgrcv:
1208 * Check permission before a message, @msg, is removed from the message
1209 * queue, @msq. The @target task structure contains a pointer to the
1210 * process that will be receiving the message (not equal to the current
1211 * process when inline receives are being performed).
1212 * @msq contains the message queue to retrieve message from.
1213 * @msg contains the message destination.
1214 * @target contains the task structure for recipient process.
1215 * @type contains the type of message requested.
1216 * @mode contains the operational flags.
1217 * Return 0 if permission is granted.
1218 *
1219 * Security hooks for System V Shared Memory Segments
1220 *
1221 * @shm_alloc_security:
1222 * Allocate and attach a security structure to the shp->shm_perm.security
1223 * field. The security field is initialized to NULL when the structure is
1224 * first created.
1225 * @shp contains the shared memory structure to be modified.
1226 * Return 0 if operation was successful and permission is granted.
1227 * @shm_free_security:
1228 * Deallocate the security struct for this memory segment.
1229 * @shp contains the shared memory structure to be modified.
1230 * @shm_associate:
1231 * Check permission when a shared memory region is requested through the
1232 * shmget system call. This hook is only called when returning the shared
1233 * memory region identifier for an existing region, not when a new shared
1234 * memory region is created.
1235 * @shp contains the shared memory structure to be modified.
1236 * @shmflg contains the operation control flags.
1237 * Return 0 if permission is granted.
1238 * @shm_shmctl:
1239 * Check permission when a shared memory control operation specified by
1240 * @cmd is to be performed on the shared memory region @shp.
1241 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1242 * @shp contains shared memory structure to be modified.
1243 * @cmd contains the operation to be performed.
1244 * Return 0 if permission is granted.
1245 * @shm_shmat:
1246 * Check permissions prior to allowing the shmat system call to attach the
1247 * shared memory segment @shp to the data segment of the calling process.
1248 * The attaching address is specified by @shmaddr.
1249 * @shp contains the shared memory structure to be modified.
1250 * @shmaddr contains the address to attach memory region to.
1251 * @shmflg contains the operational flags.
1252 * Return 0 if permission is granted.
1253 *
1254 * Security hooks for System V Semaphores
1255 *
1256 * @sem_alloc_security:
1257 * Allocate and attach a security structure to the sma->sem_perm.security
1258 * field. The security field is initialized to NULL when the structure is
1259 * first created.
1260 * @sma contains the semaphore structure
1261 * Return 0 if operation was successful and permission is granted.
1262 * @sem_free_security:
1263 * deallocate security struct for this semaphore
1264 * @sma contains the semaphore structure.
1265 * @sem_associate:
1266 * Check permission when a semaphore is requested through the semget
1267 * system call. This hook is only called when returning the semaphore
1268 * identifier for an existing semaphore, not when a new one must be
1269 * created.
1270 * @sma contains the semaphore structure.
1271 * @semflg contains the operation control flags.
1272 * Return 0 if permission is granted.
1273 * @sem_semctl:
1274 * Check permission when a semaphore operation specified by @cmd is to be
1275 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1276 * IPC_INFO or SEM_INFO.
1277 * @sma contains the semaphore structure. May be NULL.
1278 * @cmd contains the operation to be performed.
1279 * Return 0 if permission is granted.
1280 * @sem_semop
1281 * Check permissions before performing operations on members of the
1282 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1283 * may be modified.
1284 * @sma contains the semaphore structure.
1285 * @sops contains the operations to perform.
1286 * @nsops contains the number of operations to perform.
1287 * @alter contains the flag indicating whether changes are to be made.
1288 * Return 0 if permission is granted.
1289 *
1290 * @ptrace_access_check:
1291 * Check permission before allowing the current process to trace the
1292 * @child process.
1293 * Security modules may also want to perform a process tracing check
1294 * during an execve in the set_security or apply_creds hooks of
1295 * tracing check during an execve in the bprm_set_creds hook of
1296 * binprm_security_ops if the process is being traced and its security
1297 * attributes would be changed by the execve.
1298 * @child contains the task_struct structure for the target process.
1299 * @mode contains the PTRACE_MODE flags indicating the form of access.
1300 * Return 0 if permission is granted.
1301 * @ptrace_traceme:
1302 * Check that the @parent process has sufficient permission to trace the
1303 * current process before allowing the current process to present itself
1304 * to the @parent process for tracing.
1305 * The parent process will still have to undergo the ptrace_access_check
1306 * checks before it is allowed to trace this one.
1307 * @parent contains the task_struct structure for debugger process.
1308 * Return 0 if permission is granted.
1309 * @capget:
1310 * Get the @effective, @inheritable, and @permitted capability sets for
1311 * the @target process. The hook may also perform permission checking to
1312 * determine if the current process is allowed to see the capability sets
1313 * of the @target process.
1314 * @target contains the task_struct structure for target process.
1315 * @effective contains the effective capability set.
1316 * @inheritable contains the inheritable capability set.
1317 * @permitted contains the permitted capability set.
1318 * Return 0 if the capability sets were successfully obtained.
1319 * @capset:
1320 * Set the @effective, @inheritable, and @permitted capability sets for
1321 * the current process.
1322 * @new contains the new credentials structure for target process.
1323 * @old contains the current credentials structure for target process.
1324 * @effective contains the effective capability set.
1325 * @inheritable contains the inheritable capability set.
1326 * @permitted contains the permitted capability set.
1327 * Return 0 and update @new if permission is granted.
1328 * @capable:
1329 * Check whether the @tsk process has the @cap capability in the indicated
1330 * credentials.
1331 * @tsk contains the task_struct for the process.
1332 * @cred contains the credentials to use.
1333 * @cap contains the capability <include/linux/capability.h>.
1334 * @audit: Whether to write an audit message or not
1335 * Return 0 if the capability is granted for @tsk.
1336 * @acct:
1337 * Check permission before enabling or disabling process accounting. If
1338 * accounting is being enabled, then @file refers to the open file used to
1339 * store accounting records. If accounting is being disabled, then @file
1340 * is NULL.
1341 * @file contains the file structure for the accounting file (may be NULL).
1342 * Return 0 if permission is granted.
1343 * @sysctl:
1344 * Check permission before accessing the @table sysctl variable in the
1345 * manner specified by @op.
1346 * @table contains the ctl_table structure for the sysctl variable.
1347 * @op contains the operation (001 = search, 002 = write, 004 = read).
1348 * Return 0 if permission is granted.
1349 * @syslog:
1350 * Check permission before accessing the kernel message ring or changing
1351 * logging to the console.
1352 * See the syslog(2) manual page for an explanation of the @type values.
1353 * @type contains the type of action.
1354 * @from_file indicates the context of action (if it came from /proc).
1355 * Return 0 if permission is granted.
1356 * @settime:
1357 * Check permission to change the system time.
1358 * struct timespec and timezone are defined in include/linux/time.h
1359 * @ts contains new time
1360 * @tz contains new timezone
1361 * Return 0 if permission is granted.
1362 * @vm_enough_memory:
1363 * Check permissions for allocating a new virtual mapping.
1364 * @mm contains the mm struct it is being added to.
1365 * @pages contains the number of pages.
1366 * Return 0 if permission is granted.
1367 *
1368 * @secid_to_secctx:
1369 * Convert secid to security context.
1370 * @secid contains the security ID.
1371 * @secdata contains the pointer that stores the converted security context.
1372 * @secctx_to_secid:
1373 * Convert security context to secid.
1374 * @secid contains the pointer to the generated security ID.
1375 * @secdata contains the security context.
1376 *
1377 * @release_secctx:
1378 * Release the security context.
1379 * @secdata contains the security context.
1380 * @seclen contains the length of the security context.
1381 *
1382 * Security hooks for Audit
1383 *
1384 * @audit_rule_init:
1385 * Allocate and initialize an LSM audit rule structure.
1386 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1387 * @op contains the operator the rule uses.
1388 * @rulestr contains the context where the rule will be applied to.
1389 * @lsmrule contains a pointer to receive the result.
1390 * Return 0 if @lsmrule has been successfully set,
1391 * -EINVAL in case of an invalid rule.
1392 *
1393 * @audit_rule_known:
1394 * Specifies whether given @rule contains any fields related to current LSM.
1395 * @rule contains the audit rule of interest.
1396 * Return 1 in case of relation found, 0 otherwise.
1397 *
1398 * @audit_rule_match:
1399 * Determine if given @secid matches a rule previously approved
1400 * by @audit_rule_known.
1401 * @secid contains the security id in question.
1402 * @field contains the field which relates to current LSM.
1403 * @op contains the operator that will be used for matching.
1404 * @rule points to the audit rule that will be checked against.
1405 * @actx points to the audit context associated with the check.
1406 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1407 *
1408 * @audit_rule_free:
1409 * Deallocate the LSM audit rule structure previously allocated by
1410 * audit_rule_init.
1411 * @rule contains the allocated rule
1412 *
1413 * @inode_notifysecctx:
1414 * Notify the security module of what the security context of an inode
1415 * should be. Initializes the incore security context managed by the
1416 * security module for this inode. Example usage: NFS client invokes
1417 * this hook to initialize the security context in its incore inode to the
1418 * value provided by the server for the file when the server returned the
1419 * file's attributes to the client.
1420 *
1421 * Must be called with inode->i_mutex locked.
1422 *
1423 * @inode we wish to set the security context of.
1424 * @ctx contains the string which we wish to set in the inode.
1425 * @ctxlen contains the length of @ctx.
1426 *
1427 * @inode_setsecctx:
1428 * Change the security context of an inode. Updates the
1429 * incore security context managed by the security module and invokes the
1430 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1431 * xattrs that represent the context. Example usage: NFS server invokes
1432 * this hook to change the security context in its incore inode and on the
1433 * backing filesystem to a value provided by the client on a SETATTR
1434 * operation.
1435 *
1436 * Must be called with inode->i_mutex locked.
1437 *
1438 * @dentry contains the inode we wish to set the security context of.
1439 * @ctx contains the string which we wish to set in the inode.
1440 * @ctxlen contains the length of @ctx.
1441 *
1442 * @inode_getsecctx:
1443 * Returns a string containing all relavent security context information
1444 *
1445 * @inode we wish to set the security context of.
1446 * @ctx is a pointer in which to place the allocated security context.
1447 * @ctxlen points to the place to put the length of @ctx.
1448 * This is the main security structure.
1449 */
1505 #ifdef CONFIG_SECURITY_PATH
1520 mode_t mode);
1523 #endif
1557 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1558 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1587 gfp_t gfp);
1664 #ifdef CONFIG_SECURITY_NETWORK
1688 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1705 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1708 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1713 u32 secid);
1723 /* key management security hooks */
1724 #ifdef CONFIG_KEYS
1729 key_perm_t perm);
1736 #ifdef CONFIG_AUDIT
1743 };
1745 /* prototypes */
1750 /* Security operations */
1829 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1830 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1918 };
1921 {
1922 }
1925 {
1926 }
1928 /*
1929 * This is the default capabilities functionality. Most of these functions
1930 * are just stubbed out, but a few must call the proper capable code.
1931 */
1934 {
1936 }
1940 {
1942 }
1945 {
1947 }
1953 {
1955 }
1962 {
1964 }
1967 {
1969 }
1972 {
1979 }
1983 {
1988 SECURITY_CAP_NOAUDIT);
1991 }
1994 {
1996 }
1999 {
2001 }
2005 {
2007 }
2010 {
2012 }
2015 {
2017 }
2020 {
2022 }
2025 {
2028 }
2031 {
2034 }
2037 {
2038 /* If current->mm is a kernel thread then we will pass NULL,
2039 for this specific case that is fine */
2041 }
2044 {
2046 }
2049 {
2051 }
2054 {
2055 }
2058 {
2059 }
2062 {
2064 }
2067 {
2069 }
2072 { }
2075 {
2077 }
2080 {
2082 }
2086 {
2088 }
2091 {
2093 }
2098 {
2100 }
2104 {
2106 }
2109 {
2111 }
2114 { }
2117 { }
2121 { }
2125 { }
2129 {
2131 }
2135 { }
2139 {
2141 }
2145 { }
2148 {
2150 }
2153 {
2155 }
2158 { }
2165 {
2167 }
2172 {
2174 }
2179 {
2181 }
2185 {
2187 }
2192 {
2194 }
2199 {
2201 }
2205 {
2207 }
2212 {
2214 }
2220 {
2222 }
2225 {
2227 }
2231 {
2233 }
2236 {
2238 }
2242 {
2244 }
2248 {
2250 }
2253 { }
2257 {
2259 }
2263 { }
2267 {
2269 }
2272 {
2274 }
2278 {
2280 }
2283 {
2285 }
2288 {
2290 }
2292 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2293 {
2295 }
2297 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2298 {
2300 }
2302 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2303 {
2305 }
2308 {
2310 }
2313 {
2315 }
2318 {
2320 }
2323 { }
2327 {
2329 }
2336 {
2338 }
2343 {
2345 }
2348 {
2350 }
2354 {
2356 }
2359 {
2361 }
2366 {
2368 }
2371 {
2373 }
2377 {
2379 }
2382 {
2384 }
2387 {
2389 }
2392 { }
2396 gfp_t gfp)
2397 {
2399 }
2403 {
2404 }
2408 {
2409 }
2412 {
2414 }
2418 {
2420 }
2423 {
2425 }
2429 {
2431 }
2436 {
2438 }
2442 {
2444 }
2447 {
2449 }
2452 {
2454 }
2457 {
2459 }
2462 {
2464 }
2467 {
2469 }
2472 {
2474 }
2477 {
2479 }
2482 {
2484 }
2488 {
2490 }
2495 {
2497 }
2500 {
2502 }
2505 {
2507 }
2511 u32 secid)
2512 {
2514 }
2517 {
2519 }
2525 {
2527 }
2530 { }
2534 {
2536 }
2539 {
2541 }
2544 {
2546 }
2549 { }
2552 {
2554 }
2557 { }
2561 {
2563 }
2566 {
2568 }
2572 {
2574 }
2580 {
2582 }
2585 {
2587 }
2590 { }
2594 {
2596 }
2599 {
2601 }
2605 {
2607 }
2610 {
2612 }
2615 { }
2618 {
2620 }
2623 {
2625 }
2630 {
2632 }
2635 { }
2638 {
2640 }
2642 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2643 {
2645 }
2648 {
2650 }
2653 {
2655 }
2658 {
2660 }
2663 u32 seclen,
2665 {
2667 }
2670 {
2671 }
2674 {
2676 }
2678 {
2680 }
2682 {
2684 }
2687 #ifdef CONFIG_SECURITY_NETWORK
2731 {
2733 }
2737 {
2739 }
2743 {
2745 }
2751 {
2753 }
2758 {
2760 }
2765 {
2767 }
2770 {
2772 }
2776 {
2778 }
2782 {
2784 }
2789 {
2791 }
2794 {
2796 }
2799 {
2801 }
2805 {
2807 }
2811 {
2813 }
2816 {
2818 }
2821 {
2823 }
2827 {
2829 }
2831 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2832 {
2834 }
2837 {
2839 }
2842 {
2843 }
2846 {
2847 }
2850 {
2851 }
2853 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2854 {
2855 }
2858 {
2859 }
2863 {
2865 }
2869 {
2870 }
2874 {
2875 }
2878 {
2880 }
2883 {
2884 }
2887 {
2889 }
2892 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2911 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2912 {
2914 }
2916 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2917 {
2919 }
2922 {
2923 }
2926 {
2928 }
2932 {
2934 }
2938 {
2940 }
2943 {
2944 }
2947 {
2949 }
2952 {
2954 }
2958 {
2960 }
2963 {
2965 }
2968 {
2969 }
2973 #ifdef CONFIG_SECURITY_PATH
2988 mode_t mode);
2993 {
2995 }
2999 {
3001 }
3004 {
3006 }
3010 {
3012 }
3016 {
3018 }
3022 {
3024 }
3029 {
3031 }
3037 {
3039 }
3043 mode_t mode)
3044 {
3046 }
3049 {
3051 }
3054 {
3056 }
3059 #ifdef CONFIG_KEYS
3060 #ifdef CONFIG_SECURITY
3071 #else
3076 {
3078 }
3081 {
3082 }
3086 key_perm_t perm)
3087 {
3089 }
3092 {
3095 }
3100 {
3102 }
3104 #endif
3107 #ifdef CONFIG_AUDIT
3108 #ifdef CONFIG_SECURITY
3115 #else
3119 {
3121 }
3124 {
3126 }
3130 {
3132 }
3135 { }
3140 #ifdef CONFIG_SECURITYFS
3152 {
3154 }
3157 mode_t mode,
3161 {
3163 }
3166 {}
3168 #endif
3170 #ifdef CONFIG_SECURITY
3173 {
3175 }
3178 {
3180 }
3182 #else
3185 {
3187 }
3190 { }