| blob | d40d23fa576ad154c9a703e06426b142068a7df1 |
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);
98 #ifdef CONFIG_MMU
101 #else
102 #define dac_mmap_min_addr 0UL
103 #endif
105 /*
106 * Values used in the task_security_ops calls
107 */
108 /* setuid or setgid, id0 == uid or gid */
109 #define LSM_SETID_ID 1
111 /* setreuid or setregid, id0 == real, id1 == eff */
112 #define LSM_SETID_RE 2
114 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
115 #define LSM_SETID_RES 4
117 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
118 #define LSM_SETID_FS 8
120 /* forward declares to avoid warnings */
124 /* bprm->unsafe reasons */
125 #define LSM_UNSAFE_SHARE 1
126 #define LSM_UNSAFE_PTRACE 2
127 #define LSM_UNSAFE_PTRACE_CAP 4
129 #ifdef CONFIG_MMU
130 /*
131 * If a hint addr is less than mmap_min_addr change hint to be as
132 * low as possible but still greater than mmap_min_addr
133 */
135 {
141 }
144 #endif
146 #ifdef CONFIG_SECURITY
152 };
155 {
159 }
162 {
172 }
174 /**
175 * struct security_operations - main security structure
176 *
177 * Security module identifier.
178 *
179 * @name:
180 * A string that acts as a unique identifeir for the LSM with max number
181 * of characters = SECURITY_NAME_MAX.
182 *
183 * Security hooks for program execution operations.
184 *
185 * @bprm_set_creds:
186 * Save security information in the bprm->security field, typically based
187 * on information about the bprm->file, for later use by the apply_creds
188 * hook. This hook may also optionally check permissions (e.g. for
189 * transitions between security domains).
190 * This hook may be called multiple times during a single execve, e.g. for
191 * interpreters. The hook can tell whether it has already been called by
192 * checking to see if @bprm->security is non-NULL. If so, then the hook
193 * may decide either to retain the security information saved earlier or
194 * to replace it.
195 * @bprm contains the linux_binprm structure.
196 * Return 0 if the hook is successful and permission is granted.
197 * @bprm_check_security:
198 * This hook mediates the point when a search for a binary handler will
199 * begin. It allows a check the @bprm->security value which is set in the
200 * preceding set_creds call. The primary difference from set_creds is
201 * that the argv list and envp list are reliably available in @bprm. This
202 * hook may be called multiple times during a single execve; and in each
203 * pass set_creds is called first.
204 * @bprm contains the linux_binprm structure.
205 * Return 0 if the hook is successful and permission is granted.
206 * @bprm_committing_creds:
207 * Prepare to install the new security attributes of a process being
208 * transformed by an execve operation, based on the old credentials
209 * pointed to by @current->cred and the information set in @bprm->cred by
210 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
211 * This hook is a good place to perform state changes on the process such
212 * as closing open file descriptors to which access will no longer be
213 * granted when the attributes are changed. This is called immediately
214 * before commit_creds().
215 * @bprm_committed_creds:
216 * Tidy up after the installation of the new security attributes of a
217 * process being transformed by an execve operation. The new credentials
218 * have, by this point, been set to @current->cred. @bprm points to the
219 * linux_binprm structure. This hook is a good place to perform state
220 * changes on the process such as clearing out non-inheritable signal
221 * state. This is called immediately after commit_creds().
222 * @bprm_secureexec:
223 * Return a boolean value (0 or 1) indicating whether a "secure exec"
224 * is required. The flag is passed in the auxiliary table
225 * on the initial stack to the ELF interpreter to indicate whether libc
226 * should enable secure mode.
227 * @bprm contains the linux_binprm structure.
228 *
229 * Security hooks for filesystem operations.
230 *
231 * @sb_alloc_security:
232 * Allocate and attach a security structure to the sb->s_security field.
233 * The s_security field is initialized to NULL when the structure is
234 * allocated.
235 * @sb contains the super_block structure to be modified.
236 * Return 0 if operation was successful.
237 * @sb_free_security:
238 * Deallocate and clear the sb->s_security field.
239 * @sb contains the super_block structure to be modified.
240 * @sb_statfs:
241 * Check permission before obtaining filesystem statistics for the @mnt
242 * mountpoint.
243 * @dentry is a handle on the superblock for the filesystem.
244 * Return 0 if permission is granted.
245 * @sb_mount:
246 * Check permission before an object specified by @dev_name is mounted on
247 * the mount point named by @nd. For an ordinary mount, @dev_name
248 * identifies a device if the file system type requires a device. For a
249 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
250 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
251 * pathname of the object being mounted.
252 * @dev_name contains the name for object being mounted.
253 * @path contains the path for mount point object.
254 * @type contains the filesystem type.
255 * @flags contains the mount flags.
256 * @data contains the filesystem-specific data.
257 * Return 0 if permission is granted.
258 * @sb_copy_data:
259 * Allow mount option data to be copied prior to parsing by the filesystem,
260 * so that the security module can extract security-specific mount
261 * options cleanly (a filesystem may modify the data e.g. with strsep()).
262 * This also allows the original mount data to be stripped of security-
263 * specific options to avoid having to make filesystems aware of them.
264 * @type the type of filesystem being mounted.
265 * @orig the original mount data copied from userspace.
266 * @copy copied data which will be passed to the security module.
267 * Returns 0 if the copy was successful.
268 * @sb_check_sb:
269 * Check permission before the device with superblock @mnt->sb is mounted
270 * on the mount point named by @nd.
271 * @mnt contains the vfsmount for device being mounted.
272 * @path contains the path for the mount point.
273 * Return 0 if permission is granted.
274 * @sb_umount:
275 * Check permission before the @mnt file system is unmounted.
276 * @mnt contains the mounted file system.
277 * @flags contains the unmount flags, e.g. MNT_FORCE.
278 * Return 0 if permission is granted.
279 * @sb_umount_close:
280 * Close any files in the @mnt mounted filesystem that are held open by
281 * the security module. This hook is called during an umount operation
282 * prior to checking whether the filesystem is still busy.
283 * @mnt contains the mounted filesystem.
284 * @sb_umount_busy:
285 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
286 * any files that were closed by umount_close. This hook is called during
287 * an umount operation if the umount fails after a call to the
288 * umount_close hook.
289 * @mnt contains the mounted filesystem.
290 * @sb_post_remount:
291 * Update the security module's state when a filesystem is remounted.
292 * This hook is only called if the remount was successful.
293 * @mnt contains the mounted file system.
294 * @flags contains the new filesystem flags.
295 * @data contains the filesystem-specific data.
296 * @sb_post_addmount:
297 * Update the security module's state when a filesystem is mounted.
298 * This hook is called any time a mount is successfully grafetd to
299 * the tree.
300 * @mnt contains the mounted filesystem.
301 * @mountpoint contains the path for the mount point.
302 * @sb_pivotroot:
303 * Check permission before pivoting the root filesystem.
304 * @old_path contains the path for the new location of the current root (put_old).
305 * @new_path contains the path for the new root (new_root).
306 * Return 0 if permission is granted.
307 * @sb_post_pivotroot:
308 * Update module state after a successful pivot.
309 * @old_path contains the path for the old root.
310 * @new_path contains the path for the new root.
311 * @sb_set_mnt_opts:
312 * Set the security relevant mount options used for a superblock
313 * @sb the superblock to set security mount options for
314 * @opts binary data structure containing all lsm mount data
315 * @sb_clone_mnt_opts:
316 * Copy all security options from a given superblock to another
317 * @oldsb old superblock which contain information to clone
318 * @newsb new superblock which needs filled in
319 * @sb_parse_opts_str:
320 * Parse a string of security data filling in the opts structure
321 * @options string containing all mount options known by the LSM
322 * @opts binary data structure usable by the LSM
323 *
324 * Security hooks for inode operations.
325 *
326 * @inode_alloc_security:
327 * Allocate and attach a security structure to @inode->i_security. The
328 * i_security field is initialized to NULL when the inode structure is
329 * allocated.
330 * @inode contains the inode structure.
331 * Return 0 if operation was successful.
332 * @inode_free_security:
333 * @inode contains the inode structure.
334 * Deallocate the inode security structure and set @inode->i_security to
335 * NULL.
336 * @inode_init_security:
337 * Obtain the security attribute name suffix and value to set on a newly
338 * created inode and set up the incore security field for the new inode.
339 * This hook is called by the fs code as part of the inode creation
340 * transaction and provides for atomic labeling of the inode, unlike
341 * the post_create/mkdir/... hooks called by the VFS. The hook function
342 * is expected to allocate the name and value via kmalloc, with the caller
343 * being responsible for calling kfree after using them.
344 * If the security module does not use security attributes or does
345 * not wish to put a security attribute on this particular inode,
346 * then it should return -EOPNOTSUPP to skip this processing.
347 * @inode contains the inode structure of the newly created inode.
348 * @dir contains the inode structure of the parent directory.
349 * @name will be set to the allocated name suffix (e.g. selinux).
350 * @value will be set to the allocated attribute value.
351 * @len will be set to the length of the value.
352 * Returns 0 if @name and @value have been successfully set,
353 * -EOPNOTSUPP if no security attribute is needed, or
354 * -ENOMEM on memory allocation failure.
355 * @inode_create:
356 * Check permission to create a regular file.
357 * @dir contains inode structure of the parent of the new file.
358 * @dentry contains the dentry structure for the file to be created.
359 * @mode contains the file mode of the file to be created.
360 * Return 0 if permission is granted.
361 * @inode_link:
362 * Check permission before creating a new hard link to a file.
363 * @old_dentry contains the dentry structure for an existing link to the file.
364 * @dir contains the inode structure of the parent directory of the new link.
365 * @new_dentry contains the dentry structure for the new link.
366 * Return 0 if permission is granted.
367 * @path_link:
368 * Check permission before creating a new hard link to a file.
369 * @old_dentry contains the dentry structure for an existing link
370 * to the file.
371 * @new_dir contains the path structure of the parent directory of
372 * the new link.
373 * @new_dentry contains the dentry structure for the new link.
374 * Return 0 if permission is granted.
375 * @inode_unlink:
376 * Check the permission to remove a hard link to a file.
377 * @dir contains the inode structure of parent directory of the file.
378 * @dentry contains the dentry structure for file to be unlinked.
379 * Return 0 if permission is granted.
380 * @path_unlink:
381 * Check the permission to remove a hard link to a file.
382 * @dir contains the path structure of parent directory of the file.
383 * @dentry contains the dentry structure for file to be unlinked.
384 * Return 0 if permission is granted.
385 * @inode_symlink:
386 * Check the permission to create a symbolic link to a file.
387 * @dir contains the inode structure of parent directory of 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 * @path_symlink:
392 * Check the permission to create a symbolic link to a file.
393 * @dir contains the path structure of parent directory of
394 * the symbolic link.
395 * @dentry contains the dentry structure of the symbolic link.
396 * @old_name contains the pathname of file.
397 * Return 0 if permission is granted.
398 * @inode_mkdir:
399 * Check permissions to create a new directory in the existing directory
400 * associated with inode strcture @dir.
401 * @dir containst the inode structure of parent of the directory to be created.
402 * @dentry contains the dentry structure of new directory.
403 * @mode contains the mode of new directory.
404 * Return 0 if permission is granted.
405 * @path_mkdir:
406 * Check permissions to create a new directory in the existing directory
407 * associated with path strcture @path.
408 * @dir containst the path structure of parent of the directory
409 * to be created.
410 * @dentry contains the dentry structure of new directory.
411 * @mode contains the mode of new directory.
412 * Return 0 if permission is granted.
413 * @inode_rmdir:
414 * Check the permission to remove a directory.
415 * @dir contains the inode structure of parent of the directory to be removed.
416 * @dentry contains the dentry structure of directory to be removed.
417 * Return 0 if permission is granted.
418 * @path_rmdir:
419 * Check the permission to remove a directory.
420 * @dir contains the path structure of parent of the directory to be
421 * removed.
422 * @dentry contains the dentry structure of directory to be removed.
423 * Return 0 if permission is granted.
424 * @inode_mknod:
425 * Check permissions when creating a special file (or a socket or a fifo
426 * file created via the mknod system call). Note that if mknod operation
427 * is being done for a regular file, then the create hook will be called
428 * and not this hook.
429 * @dir contains the inode structure of parent of the new file.
430 * @dentry contains the dentry structure of the new file.
431 * @mode contains the mode of the new file.
432 * @dev contains the device number.
433 * Return 0 if permission is granted.
434 * @path_mknod:
435 * Check permissions when creating a file. Note that this hook is called
436 * even if mknod operation is being done for a regular file.
437 * @dir contains the path structure of parent of the new file.
438 * @dentry contains the dentry structure of the new file.
439 * @mode contains the mode of the new file.
440 * @dev contains the undecoded device number. Use new_decode_dev() to get
441 * the decoded device number.
442 * Return 0 if permission is granted.
443 * @inode_rename:
444 * Check for permission to rename a file or directory.
445 * @old_dir contains the inode structure for parent of the old link.
446 * @old_dentry contains the dentry structure of the old link.
447 * @new_dir contains the inode 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 * @path_rename:
451 * Check for permission to rename a file or directory.
452 * @old_dir contains the path structure for parent of the old link.
453 * @old_dentry contains the dentry structure of the old link.
454 * @new_dir contains the path structure for parent of the new link.
455 * @new_dentry contains the dentry structure of the new link.
456 * Return 0 if permission is granted.
457 * @inode_readlink:
458 * Check the permission to read the symbolic link.
459 * @dentry contains the dentry structure for the file link.
460 * Return 0 if permission is granted.
461 * @inode_follow_link:
462 * Check permission to follow a symbolic link when looking up a pathname.
463 * @dentry contains the dentry structure for the link.
464 * @nd contains the nameidata structure for the parent directory.
465 * Return 0 if permission is granted.
466 * @inode_permission:
467 * Check permission before accessing an inode. This hook is called by the
468 * existing Linux permission function, so a security module can use it to
469 * provide additional checking for existing Linux permission checks.
470 * Notice that this hook is called when a file is opened (as well as many
471 * other operations), whereas the file_security_ops permission hook is
472 * called when the actual read/write operations are performed.
473 * @inode contains the inode structure to check.
474 * @mask contains the permission mask.
475 * @nd contains the nameidata (may be NULL).
476 * Return 0 if permission is granted.
477 * @inode_setattr:
478 * Check permission before setting file attributes. Note that the kernel
479 * call to notify_change is performed from several locations, whenever
480 * file attributes change (such as when a file is truncated, chown/chmod
481 * operations, transferring disk quotas, etc).
482 * @dentry contains the dentry structure for the file.
483 * @attr is the iattr structure containing the new file attributes.
484 * Return 0 if permission is granted.
485 * @path_truncate:
486 * Check permission before truncating a file.
487 * @path contains the path structure for the file.
488 * @length is the new length of the file.
489 * @time_attrs is the flags passed to do_truncate().
490 * Return 0 if permission is granted.
491 * @inode_getattr:
492 * Check permission before obtaining file attributes.
493 * @mnt is the vfsmount where the dentry was looked up
494 * @dentry contains the dentry structure for the file.
495 * Return 0 if permission is granted.
496 * @inode_delete:
497 * @inode contains the inode structure for deleted inode.
498 * This hook is called when a deleted inode is released (i.e. an inode
499 * with no hard links has its use count drop to zero). A security module
500 * can use this hook to release any persistent label associated with the
501 * inode.
502 * @inode_setxattr:
503 * Check permission before setting the extended attributes
504 * @value identified by @name for @dentry.
505 * Return 0 if permission is granted.
506 * @inode_post_setxattr:
507 * Update inode security field after successful setxattr operation.
508 * @value identified by @name for @dentry.
509 * @inode_getxattr:
510 * Check permission before obtaining the extended attributes
511 * identified by @name for @dentry.
512 * Return 0 if permission is granted.
513 * @inode_listxattr:
514 * Check permission before obtaining the list of extended attribute
515 * names for @dentry.
516 * Return 0 if permission is granted.
517 * @inode_removexattr:
518 * Check permission before removing the extended attribute
519 * identified by @name for @dentry.
520 * Return 0 if permission is granted.
521 * @inode_getsecurity:
522 * Retrieve a copy of the extended attribute representation of the
523 * security label associated with @name for @inode via @buffer. Note that
524 * @name is the remainder of the attribute name after the security prefix
525 * has been removed. @alloc is used to specify of the call should return a
526 * value via the buffer or just the value length Return size of buffer on
527 * success.
528 * @inode_setsecurity:
529 * Set the security label associated with @name for @inode from the
530 * extended attribute value @value. @size indicates the size of the
531 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
532 * Note that @name is the remainder of the attribute name after the
533 * security. prefix has been removed.
534 * Return 0 on success.
535 * @inode_listsecurity:
536 * Copy the extended attribute names for the security labels
537 * associated with @inode into @buffer. The maximum size of @buffer
538 * is specified by @buffer_size. @buffer may be NULL to request
539 * the size of the buffer required.
540 * Returns number of bytes used/required on success.
541 * @inode_need_killpriv:
542 * Called when an inode has been changed.
543 * @dentry is the dentry being changed.
544 * Return <0 on error to abort the inode change operation.
545 * Return 0 if inode_killpriv does not need to be called.
546 * Return >0 if inode_killpriv does need to be called.
547 * @inode_killpriv:
548 * The setuid bit is being removed. Remove similar security labels.
549 * Called with the dentry->d_inode->i_mutex held.
550 * @dentry is the dentry being changed.
551 * Return 0 on success. If error is returned, then the operation
552 * causing setuid bit removal is failed.
553 * @inode_getsecid:
554 * Get the secid associated with the node.
555 * @inode contains a pointer to the inode.
556 * @secid contains a pointer to the location where result will be saved.
557 * In case of failure, @secid will be set to zero.
558 *
559 * Security hooks for file operations
560 *
561 * @file_permission:
562 * Check file permissions before accessing an open file. This hook is
563 * called by various operations that read or write files. A security
564 * module can use this hook to perform additional checking on these
565 * operations, e.g. to revalidate permissions on use to support privilege
566 * bracketing or policy changes. Notice that this hook is used when the
567 * actual read/write operations are performed, whereas the
568 * inode_security_ops hook is called when a file is opened (as well as
569 * many other operations).
570 * Caveat: Although this hook can be used to revalidate permissions for
571 * various system call operations that read or write files, it does not
572 * address the revalidation of permissions for memory-mapped files.
573 * Security modules must handle this separately if they need such
574 * revalidation.
575 * @file contains the file structure being accessed.
576 * @mask contains the requested permissions.
577 * Return 0 if permission is granted.
578 * @file_alloc_security:
579 * Allocate and attach a security structure to the file->f_security field.
580 * The security field is initialized to NULL when the structure is first
581 * created.
582 * @file contains the file structure to secure.
583 * Return 0 if the hook is successful and permission is granted.
584 * @file_free_security:
585 * Deallocate and free any security structures stored in file->f_security.
586 * @file contains the file structure being modified.
587 * @file_ioctl:
588 * @file contains the file structure.
589 * @cmd contains the operation to perform.
590 * @arg contains the operational arguments.
591 * Check permission for an ioctl operation on @file. Note that @arg can
592 * sometimes represents a user space pointer; in other cases, it may be a
593 * simple integer value. When @arg represents a user space pointer, it
594 * should never be used by the security module.
595 * Return 0 if permission is granted.
596 * @file_mmap :
597 * Check permissions for a mmap operation. The @file may be NULL, e.g.
598 * if mapping anonymous memory.
599 * @file contains the file structure for file to map (may be NULL).
600 * @reqprot contains the protection requested by the application.
601 * @prot contains the protection that will be applied by the kernel.
602 * @flags contains the operational flags.
603 * Return 0 if permission is granted.
604 * @file_mprotect:
605 * Check permissions before changing memory access permissions.
606 * @vma contains the memory region to modify.
607 * @reqprot contains the protection requested by the application.
608 * @prot contains the protection that will be applied by the kernel.
609 * Return 0 if permission is granted.
610 * @file_lock:
611 * Check permission before performing file locking operations.
612 * Note: this hook mediates both flock and fcntl style locks.
613 * @file contains the file structure.
614 * @cmd contains the posix-translated lock operation to perform
615 * (e.g. F_RDLCK, F_WRLCK).
616 * Return 0 if permission is granted.
617 * @file_fcntl:
618 * Check permission before allowing the file operation specified by @cmd
619 * from being performed on the file @file. Note that @arg can sometimes
620 * represents a user space pointer; in other cases, it may be a simple
621 * integer value. When @arg represents a user space pointer, it should
622 * never be used by the security module.
623 * @file contains the file structure.
624 * @cmd contains the operation to be performed.
625 * @arg contains the operational arguments.
626 * Return 0 if permission is granted.
627 * @file_set_fowner:
628 * Save owner security information (typically from current->security) in
629 * file->f_security for later use by the send_sigiotask hook.
630 * @file contains the file structure to update.
631 * Return 0 on success.
632 * @file_send_sigiotask:
633 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
634 * process @tsk. Note that this hook is sometimes called from interrupt.
635 * Note that the fown_struct, @fown, is never outside the context of a
636 * struct file, so the file structure (and associated security information)
637 * can always be obtained:
638 * container_of(fown, struct file, f_owner)
639 * @tsk contains the structure of task receiving signal.
640 * @fown contains the file owner information.
641 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
642 * Return 0 if permission is granted.
643 * @file_receive:
644 * This hook allows security modules to control the ability of a process
645 * to receive an open file descriptor via socket IPC.
646 * @file contains the file structure being received.
647 * Return 0 if permission is granted.
648 *
649 * Security hook for dentry
650 *
651 * @dentry_open
652 * Save open-time permission checking state for later use upon
653 * file_permission, and recheck access if anything has changed
654 * since inode_permission.
655 *
656 * Security hooks for task operations.
657 *
658 * @task_create:
659 * Check permission before creating a child process. See the clone(2)
660 * manual page for definitions of the @clone_flags.
661 * @clone_flags contains the flags indicating what should be shared.
662 * Return 0 if permission is granted.
663 * @cred_alloc_blank:
664 * @cred points to the credentials.
665 * @gfp indicates the atomicity of any memory allocations.
666 * Only allocate sufficient memory and attach to @cred such that
667 * cred_transfer() will not get ENOMEM.
668 * @cred_free:
669 * @cred points to the credentials.
670 * Deallocate and clear the cred->security field in a set of credentials.
671 * @cred_prepare:
672 * @new points to the new credentials.
673 * @old points to the original credentials.
674 * @gfp indicates the atomicity of any memory allocations.
675 * Prepare a new set of credentials by copying the data from the old set.
676 * @cred_commit:
677 * @new points to the new credentials.
678 * @old points to the original credentials.
679 * Install a new set of credentials.
680 * @cred_transfer:
681 * @new points to the new credentials.
682 * @old points to the original credentials.
683 * Transfer data from original creds to new creds
684 * @kernel_act_as:
685 * Set the credentials for a kernel service to act as (subjective context).
686 * @new points to the credentials to be modified.
687 * @secid specifies the security ID to be set
688 * The current task must be the one that nominated @secid.
689 * Return 0 if successful.
690 * @kernel_create_files_as:
691 * Set the file creation context in a set of credentials to be the same as
692 * the objective context of the specified inode.
693 * @new points to the credentials to be modified.
694 * @inode points to the inode to use as a reference.
695 * The current task must be the one that nominated @inode.
696 * Return 0 if successful.
697 * @kernel_module_request:
698 * Ability to trigger the kernel to automatically upcall to userspace for
699 * userspace to load a kernel module with the given name.
700 * Return 0 if successful.
701 * @task_setuid:
702 * Check permission before setting one or more of the user identity
703 * attributes of the current process. The @flags parameter indicates
704 * which of the set*uid system calls invoked this hook and how to
705 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
706 * definitions at the beginning of this file for the @flags values and
707 * their meanings.
708 * @id0 contains a uid.
709 * @id1 contains a uid.
710 * @id2 contains a uid.
711 * @flags contains one of the LSM_SETID_* values.
712 * Return 0 if permission is granted.
713 * @task_fix_setuid:
714 * Update the module's state after setting one or more of the user
715 * identity attributes of the current process. The @flags parameter
716 * indicates which of the set*uid system calls invoked this hook. If
717 * @new is the set of credentials that will be installed. Modifications
718 * should be made to this rather than to @current->cred.
719 * @old is the set of credentials that are being replaces
720 * @flags contains one of the LSM_SETID_* values.
721 * Return 0 on success.
722 * @task_setgid:
723 * Check permission before setting one or more of the group identity
724 * attributes of the current process. The @flags parameter indicates
725 * which of the set*gid system calls invoked this hook and how to
726 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
727 * definitions at the beginning of this file for the @flags values and
728 * their meanings.
729 * @id0 contains a gid.
730 * @id1 contains a gid.
731 * @id2 contains a gid.
732 * @flags contains one of the LSM_SETID_* values.
733 * Return 0 if permission is granted.
734 * @task_setpgid:
735 * Check permission before setting the process group identifier of the
736 * process @p to @pgid.
737 * @p contains the task_struct for process being modified.
738 * @pgid contains the new pgid.
739 * Return 0 if permission is granted.
740 * @task_getpgid:
741 * Check permission before getting the process group identifier of the
742 * process @p.
743 * @p contains the task_struct for the process.
744 * Return 0 if permission is granted.
745 * @task_getsid:
746 * Check permission before getting the session identifier of the process
747 * @p.
748 * @p contains the task_struct for the process.
749 * Return 0 if permission is granted.
750 * @task_getsecid:
751 * Retrieve the security identifier of the process @p.
752 * @p contains the task_struct for the process and place is into @secid.
753 * In case of failure, @secid will be set to zero.
754 *
755 * @task_setgroups:
756 * Check permission before setting the supplementary group set of the
757 * current process.
758 * @group_info contains the new group information.
759 * Return 0 if permission is granted.
760 * @task_setnice:
761 * Check permission before setting the nice value of @p to @nice.
762 * @p contains the task_struct of process.
763 * @nice contains the new nice value.
764 * Return 0 if permission is granted.
765 * @task_setioprio
766 * Check permission before setting the ioprio value of @p to @ioprio.
767 * @p contains the task_struct of process.
768 * @ioprio contains the new ioprio value
769 * Return 0 if permission is granted.
770 * @task_getioprio
771 * Check permission before getting the ioprio value of @p.
772 * @p contains the task_struct of process.
773 * Return 0 if permission is granted.
774 * @task_setrlimit:
775 * Check permission before setting the resource limits of the current
776 * process for @resource to @new_rlim. The old resource limit values can
777 * be examined by dereferencing (current->signal->rlim + resource).
778 * @resource contains the resource whose limit is being set.
779 * @new_rlim contains the new limits for @resource.
780 * Return 0 if permission is granted.
781 * @task_setscheduler:
782 * Check permission before setting scheduling policy and/or parameters of
783 * process @p based on @policy and @lp.
784 * @p contains the task_struct for process.
785 * @policy contains the scheduling policy.
786 * @lp contains the scheduling parameters.
787 * Return 0 if permission is granted.
788 * @task_getscheduler:
789 * Check permission before obtaining scheduling information for process
790 * @p.
791 * @p contains the task_struct for process.
792 * Return 0 if permission is granted.
793 * @task_movememory
794 * Check permission before moving memory owned by process @p.
795 * @p contains the task_struct for process.
796 * Return 0 if permission is granted.
797 * @task_kill:
798 * Check permission before sending signal @sig to @p. @info can be NULL,
799 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
800 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
801 * from the kernel and should typically be permitted.
802 * SIGIO signals are handled separately by the send_sigiotask hook in
803 * file_security_ops.
804 * @p contains the task_struct for process.
805 * @info contains the signal information.
806 * @sig contains the signal value.
807 * @secid contains the sid of the process where the signal originated
808 * Return 0 if permission is granted.
809 * @task_wait:
810 * Check permission before allowing a process to reap a child process @p
811 * and collect its status information.
812 * @p contains the task_struct for process.
813 * Return 0 if permission is granted.
814 * @task_prctl:
815 * Check permission before performing a process control operation on the
816 * current process.
817 * @option contains the operation.
818 * @arg2 contains a argument.
819 * @arg3 contains a argument.
820 * @arg4 contains a argument.
821 * @arg5 contains a argument.
822 * Return -ENOSYS if no-one wanted to handle this op, any other value to
823 * cause prctl() to return immediately with that value.
824 * @task_to_inode:
825 * Set the security attributes for an inode based on an associated task's
826 * security attributes, e.g. for /proc/pid inodes.
827 * @p contains the task_struct for the task.
828 * @inode contains the inode structure for the inode.
829 *
830 * Security hooks for Netlink messaging.
831 *
832 * @netlink_send:
833 * Save security information for a netlink message so that permission
834 * checking can be performed when the message is processed. The security
835 * information can be saved using the eff_cap field of the
836 * netlink_skb_parms structure. Also may be used to provide fine
837 * grained control over message transmission.
838 * @sk associated sock of task sending the message.,
839 * @skb contains the sk_buff structure for the netlink message.
840 * Return 0 if the information was successfully saved and message
841 * is allowed to be transmitted.
842 * @netlink_recv:
843 * Check permission before processing the received netlink message in
844 * @skb.
845 * @skb contains the sk_buff structure for the netlink message.
846 * @cap indicates the capability required
847 * Return 0 if permission is granted.
848 *
849 * Security hooks for Unix domain networking.
850 *
851 * @unix_stream_connect:
852 * Check permissions before establishing a Unix domain stream connection
853 * between @sock and @other.
854 * @sock contains the socket structure.
855 * @other contains the peer socket structure.
856 * Return 0 if permission is granted.
857 * @unix_may_send:
858 * Check permissions before connecting or sending datagrams from @sock to
859 * @other.
860 * @sock contains the socket structure.
861 * @sock contains the peer socket structure.
862 * Return 0 if permission is granted.
863 *
864 * The @unix_stream_connect and @unix_may_send hooks were necessary because
865 * Linux provides an alternative to the conventional file name space for Unix
866 * domain sockets. Whereas binding and connecting to sockets in the file name
867 * space is mediated by the typical file permissions (and caught by the mknod
868 * and permission hooks in inode_security_ops), binding and connecting to
869 * sockets in the abstract name space is completely unmediated. Sufficient
870 * control of Unix domain sockets in the abstract name space isn't possible
871 * using only the socket layer hooks, since we need to know the actual target
872 * socket, which is not looked up until we are inside the af_unix code.
873 *
874 * Security hooks for socket operations.
875 *
876 * @socket_create:
877 * Check permissions prior to creating a new socket.
878 * @family contains the requested protocol family.
879 * @type contains the requested communications type.
880 * @protocol contains the requested protocol.
881 * @kern set to 1 if a kernel socket.
882 * Return 0 if permission is granted.
883 * @socket_post_create:
884 * This hook allows a module to update or allocate a per-socket security
885 * structure. Note that the security field was not added directly to the
886 * socket structure, but rather, the socket security information is stored
887 * in the associated inode. Typically, the inode alloc_security hook will
888 * allocate and and attach security information to
889 * sock->inode->i_security. This hook may be used to update the
890 * sock->inode->i_security field with additional information that wasn't
891 * available when the inode was allocated.
892 * @sock contains the newly created socket structure.
893 * @family contains the requested protocol family.
894 * @type contains the requested communications type.
895 * @protocol contains the requested protocol.
896 * @kern set to 1 if a kernel socket.
897 * @socket_bind:
898 * Check permission before socket protocol layer bind operation is
899 * performed and the socket @sock is bound to the address specified in the
900 * @address parameter.
901 * @sock contains the socket structure.
902 * @address contains the address to bind to.
903 * @addrlen contains the length of address.
904 * Return 0 if permission is granted.
905 * @socket_connect:
906 * Check permission before socket protocol layer connect operation
907 * attempts to connect socket @sock to a remote address, @address.
908 * @sock contains the socket structure.
909 * @address contains the address of remote endpoint.
910 * @addrlen contains the length of address.
911 * Return 0 if permission is granted.
912 * @socket_listen:
913 * Check permission before socket protocol layer listen operation.
914 * @sock contains the socket structure.
915 * @backlog contains the maximum length for the pending connection queue.
916 * Return 0 if permission is granted.
917 * @socket_accept:
918 * Check permission before accepting a new connection. Note that the new
919 * socket, @newsock, has been created and some information copied to it,
920 * but the accept operation has not actually been performed.
921 * @sock contains the listening socket structure.
922 * @newsock contains the newly created server socket for connection.
923 * Return 0 if permission is granted.
924 * @socket_sendmsg:
925 * Check permission before transmitting a message to another socket.
926 * @sock contains the socket structure.
927 * @msg contains the message to be transmitted.
928 * @size contains the size of message.
929 * Return 0 if permission is granted.
930 * @socket_recvmsg:
931 * Check permission before receiving a message from a socket.
932 * @sock contains the socket structure.
933 * @msg contains the message structure.
934 * @size contains the size of message structure.
935 * @flags contains the operational flags.
936 * Return 0 if permission is granted.
937 * @socket_getsockname:
938 * Check permission before the local address (name) of the socket object
939 * @sock is retrieved.
940 * @sock contains the socket structure.
941 * Return 0 if permission is granted.
942 * @socket_getpeername:
943 * Check permission before the remote address (name) of a socket object
944 * @sock is retrieved.
945 * @sock contains the socket structure.
946 * Return 0 if permission is granted.
947 * @socket_getsockopt:
948 * Check permissions before retrieving the options associated with socket
949 * @sock.
950 * @sock contains the socket structure.
951 * @level contains the protocol level to retrieve option from.
952 * @optname contains the name of option to retrieve.
953 * Return 0 if permission is granted.
954 * @socket_setsockopt:
955 * Check permissions before setting the options associated with socket
956 * @sock.
957 * @sock contains the socket structure.
958 * @level contains the protocol level to set options for.
959 * @optname contains the name of the option to set.
960 * Return 0 if permission is granted.
961 * @socket_shutdown:
962 * Checks permission before all or part of a connection on the socket
963 * @sock is shut down.
964 * @sock contains the socket structure.
965 * @how contains the flag indicating how future sends and receives are handled.
966 * Return 0 if permission is granted.
967 * @socket_sock_rcv_skb:
968 * Check permissions on incoming network packets. This hook is distinct
969 * from Netfilter's IP input hooks since it is the first time that the
970 * incoming sk_buff @skb has been associated with a particular socket, @sk.
971 * @sk contains the sock (not socket) associated with the incoming sk_buff.
972 * @skb contains the incoming network data.
973 * @socket_getpeersec_stream:
974 * This hook allows the security module to provide peer socket security
975 * state for unix or connected tcp sockets to userspace via getsockopt
976 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
977 * socket is associated with an ipsec SA.
978 * @sock is the local socket.
979 * @optval userspace memory where the security state is to be copied.
980 * @optlen userspace int where the module should copy the actual length
981 * of the security state.
982 * @len as input is the maximum length to copy to userspace provided
983 * by the caller.
984 * Return 0 if all is well, otherwise, typical getsockopt return
985 * values.
986 * @socket_getpeersec_dgram:
987 * This hook allows the security module to provide peer socket security
988 * state for udp sockets on a per-packet basis to userspace via
989 * getsockopt SO_GETPEERSEC. The application must first have indicated
990 * the IP_PASSSEC option via getsockopt. It can then retrieve the
991 * security state returned by this hook for a packet via the SCM_SECURITY
992 * ancillary message type.
993 * @skb is the skbuff for the packet being queried
994 * @secdata is a pointer to a buffer in which to copy the security data
995 * @seclen is the maximum length for @secdata
996 * Return 0 on success, error on failure.
997 * @sk_alloc_security:
998 * Allocate and attach a security structure to the sk->sk_security field,
999 * which is used to copy security attributes between local stream sockets.
1000 * @sk_free_security:
1001 * Deallocate security structure.
1002 * @sk_clone_security:
1003 * Clone/copy security structure.
1004 * @sk_getsecid:
1005 * Retrieve the LSM-specific secid for the sock to enable caching of network
1006 * authorizations.
1007 * @sock_graft:
1008 * Sets the socket's isec sid to the sock's sid.
1009 * @inet_conn_request:
1010 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
1011 * @inet_csk_clone:
1012 * Sets the new child socket's sid to the openreq sid.
1013 * @inet_conn_established:
1014 * Sets the connection's peersid to the secmark on skb.
1015 * @req_classify_flow:
1016 * Sets the flow's sid to the openreq sid.
1017 * @tun_dev_create:
1018 * Check permissions prior to creating a new TUN device.
1019 * @tun_dev_post_create:
1020 * This hook allows a module to update or allocate a per-socket security
1021 * structure.
1022 * @sk contains the newly created sock structure.
1023 * @tun_dev_attach:
1024 * Check permissions prior to attaching to a persistent TUN device. This
1025 * hook can also be used by the module to update any security state
1026 * associated with the TUN device's sock structure.
1027 * @sk contains the existing sock structure.
1028 *
1029 * Security hooks for XFRM operations.
1030 *
1031 * @xfrm_policy_alloc_security:
1032 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1033 * Database used by the XFRM system.
1034 * @sec_ctx contains the security context information being provided by
1035 * the user-level policy update program (e.g., setkey).
1036 * Allocate a security structure to the xp->security field; the security
1037 * field is initialized to NULL when the xfrm_policy is allocated.
1038 * Return 0 if operation was successful (memory to allocate, legal context)
1039 * @xfrm_policy_clone_security:
1040 * @old_ctx contains an existing xfrm_sec_ctx.
1041 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1042 * Allocate a security structure in new_ctxp that contains the
1043 * information from the old_ctx structure.
1044 * Return 0 if operation was successful (memory to allocate).
1045 * @xfrm_policy_free_security:
1046 * @ctx contains the xfrm_sec_ctx
1047 * Deallocate xp->security.
1048 * @xfrm_policy_delete_security:
1049 * @ctx contains the xfrm_sec_ctx.
1050 * Authorize deletion of xp->security.
1051 * @xfrm_state_alloc_security:
1052 * @x contains the xfrm_state being added to the Security Association
1053 * Database by the XFRM system.
1054 * @sec_ctx contains the security context information being provided by
1055 * the user-level SA generation program (e.g., setkey or racoon).
1056 * @secid contains the secid from which to take the mls portion of the context.
1057 * Allocate a security structure to the x->security field; the security
1058 * field is initialized to NULL when the xfrm_state is allocated. Set the
1059 * context to correspond to either sec_ctx or polsec, with the mls portion
1060 * taken from secid in the latter case.
1061 * Return 0 if operation was successful (memory to allocate, legal context).
1062 * @xfrm_state_free_security:
1063 * @x contains the xfrm_state.
1064 * Deallocate x->security.
1065 * @xfrm_state_delete_security:
1066 * @x contains the xfrm_state.
1067 * Authorize deletion of x->security.
1068 * @xfrm_policy_lookup:
1069 * @ctx contains the xfrm_sec_ctx for which the access control is being
1070 * checked.
1071 * @fl_secid contains the flow security label that is used to authorize
1072 * access to the policy xp.
1073 * @dir contains the direction of the flow (input or output).
1074 * Check permission when a flow selects a xfrm_policy for processing
1075 * XFRMs on a packet. The hook is called when selecting either a
1076 * per-socket policy or a generic xfrm policy.
1077 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1078 * on other errors.
1079 * @xfrm_state_pol_flow_match:
1080 * @x contains the state to match.
1081 * @xp contains the policy to check for a match.
1082 * @fl contains the flow to check for a match.
1083 * Return 1 if there is a match.
1084 * @xfrm_decode_session:
1085 * @skb points to skb to decode.
1086 * @secid points to the flow key secid to set.
1087 * @ckall says if all xfrms used should be checked for same secid.
1088 * Return 0 if ckall is zero or all xfrms used have the same secid.
1089 *
1090 * Security hooks affecting all Key Management operations
1091 *
1092 * @key_alloc:
1093 * Permit allocation of a key and assign security data. Note that key does
1094 * not have a serial number assigned at this point.
1095 * @key points to the key.
1096 * @flags is the allocation flags
1097 * Return 0 if permission is granted, -ve error otherwise.
1098 * @key_free:
1099 * Notification of destruction; free security data.
1100 * @key points to the key.
1101 * No return value.
1102 * @key_permission:
1103 * See whether a specific operational right is granted to a process on a
1104 * key.
1105 * @key_ref refers to the key (key pointer + possession attribute bit).
1106 * @cred points to the credentials to provide the context against which to
1107 * evaluate the security data on the key.
1108 * @perm describes the combination of permissions required of this key.
1109 * Return 1 if permission granted, 0 if permission denied and -ve it the
1110 * normal permissions model should be effected.
1111 * @key_getsecurity:
1112 * Get a textual representation of the security context attached to a key
1113 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1114 * allocates the storage for the NUL-terminated string and the caller
1115 * should free it.
1116 * @key points to the key to be queried.
1117 * @_buffer points to a pointer that should be set to point to the
1118 * resulting string (if no label or an error occurs).
1119 * Return the length of the string (including terminating NUL) or -ve if
1120 * an error.
1121 * May also return 0 (and a NULL buffer pointer) if there is no label.
1122 * @key_session_to_parent:
1123 * Forcibly assign the session keyring from a process to its parent
1124 * process.
1125 * @cred: Pointer to process's credentials
1126 * @parent_cred: Pointer to parent process's credentials
1127 * @keyring: Proposed new session keyring
1128 * Return 0 if permission is granted, -ve error otherwise.
1129 *
1130 * Security hooks affecting all System V IPC operations.
1131 *
1132 * @ipc_permission:
1133 * Check permissions for access to IPC
1134 * @ipcp contains the kernel IPC permission structure
1135 * @flag contains the desired (requested) permission set
1136 * Return 0 if permission is granted.
1137 * @ipc_getsecid:
1138 * Get the secid associated with the ipc object.
1139 * @ipcp contains the kernel IPC permission structure.
1140 * @secid contains a pointer to the location where result will be saved.
1141 * In case of failure, @secid will be set to zero.
1142 *
1143 * Security hooks for individual messages held in System V IPC message queues
1144 * @msg_msg_alloc_security:
1145 * Allocate and attach a security structure to the msg->security field.
1146 * The security field is initialized to NULL when the structure is first
1147 * created.
1148 * @msg contains the message structure to be modified.
1149 * Return 0 if operation was successful and permission is granted.
1150 * @msg_msg_free_security:
1151 * Deallocate the security structure for this message.
1152 * @msg contains the message structure to be modified.
1153 *
1154 * Security hooks for System V IPC Message Queues
1155 *
1156 * @msg_queue_alloc_security:
1157 * Allocate and attach a security structure to the
1158 * msq->q_perm.security field. The security field is initialized to
1159 * NULL when the structure is first created.
1160 * @msq contains the message queue structure to be modified.
1161 * Return 0 if operation was successful and permission is granted.
1162 * @msg_queue_free_security:
1163 * Deallocate security structure for this message queue.
1164 * @msq contains the message queue structure to be modified.
1165 * @msg_queue_associate:
1166 * Check permission when a message queue is requested through the
1167 * msgget system call. This hook is only called when returning the
1168 * message queue identifier for an existing message queue, not when a
1169 * new message queue is created.
1170 * @msq contains the message queue to act upon.
1171 * @msqflg contains the operation control flags.
1172 * Return 0 if permission is granted.
1173 * @msg_queue_msgctl:
1174 * Check permission when a message control operation specified by @cmd
1175 * is to be performed on the message queue @msq.
1176 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1177 * @msq contains the message queue to act upon. May be NULL.
1178 * @cmd contains the operation to be performed.
1179 * Return 0 if permission is granted.
1180 * @msg_queue_msgsnd:
1181 * Check permission before a message, @msg, is enqueued on the message
1182 * queue, @msq.
1183 * @msq contains the message queue to send message to.
1184 * @msg contains the message to be enqueued.
1185 * @msqflg contains operational flags.
1186 * Return 0 if permission is granted.
1187 * @msg_queue_msgrcv:
1188 * Check permission before a message, @msg, is removed from the message
1189 * queue, @msq. The @target task structure contains a pointer to the
1190 * process that will be receiving the message (not equal to the current
1191 * process when inline receives are being performed).
1192 * @msq contains the message queue to retrieve message from.
1193 * @msg contains the message destination.
1194 * @target contains the task structure for recipient process.
1195 * @type contains the type of message requested.
1196 * @mode contains the operational flags.
1197 * Return 0 if permission is granted.
1198 *
1199 * Security hooks for System V Shared Memory Segments
1200 *
1201 * @shm_alloc_security:
1202 * Allocate and attach a security structure to the shp->shm_perm.security
1203 * field. The security field is initialized to NULL when the structure is
1204 * first created.
1205 * @shp contains the shared memory structure to be modified.
1206 * Return 0 if operation was successful and permission is granted.
1207 * @shm_free_security:
1208 * Deallocate the security struct for this memory segment.
1209 * @shp contains the shared memory structure to be modified.
1210 * @shm_associate:
1211 * Check permission when a shared memory region is requested through the
1212 * shmget system call. This hook is only called when returning the shared
1213 * memory region identifier for an existing region, not when a new shared
1214 * memory region is created.
1215 * @shp contains the shared memory structure to be modified.
1216 * @shmflg contains the operation control flags.
1217 * Return 0 if permission is granted.
1218 * @shm_shmctl:
1219 * Check permission when a shared memory control operation specified by
1220 * @cmd is to be performed on the shared memory region @shp.
1221 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1222 * @shp contains shared memory structure to be modified.
1223 * @cmd contains the operation to be performed.
1224 * Return 0 if permission is granted.
1225 * @shm_shmat:
1226 * Check permissions prior to allowing the shmat system call to attach the
1227 * shared memory segment @shp to the data segment of the calling process.
1228 * The attaching address is specified by @shmaddr.
1229 * @shp contains the shared memory structure to be modified.
1230 * @shmaddr contains the address to attach memory region to.
1231 * @shmflg contains the operational flags.
1232 * Return 0 if permission is granted.
1233 *
1234 * Security hooks for System V Semaphores
1235 *
1236 * @sem_alloc_security:
1237 * Allocate and attach a security structure to the sma->sem_perm.security
1238 * field. The security field is initialized to NULL when the structure is
1239 * first created.
1240 * @sma contains the semaphore structure
1241 * Return 0 if operation was successful and permission is granted.
1242 * @sem_free_security:
1243 * deallocate security struct for this semaphore
1244 * @sma contains the semaphore structure.
1245 * @sem_associate:
1246 * Check permission when a semaphore is requested through the semget
1247 * system call. This hook is only called when returning the semaphore
1248 * identifier for an existing semaphore, not when a new one must be
1249 * created.
1250 * @sma contains the semaphore structure.
1251 * @semflg contains the operation control flags.
1252 * Return 0 if permission is granted.
1253 * @sem_semctl:
1254 * Check permission when a semaphore operation specified by @cmd is to be
1255 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1256 * IPC_INFO or SEM_INFO.
1257 * @sma contains the semaphore structure. May be NULL.
1258 * @cmd contains the operation to be performed.
1259 * Return 0 if permission is granted.
1260 * @sem_semop
1261 * Check permissions before performing operations on members of the
1262 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1263 * may be modified.
1264 * @sma contains the semaphore structure.
1265 * @sops contains the operations to perform.
1266 * @nsops contains the number of operations to perform.
1267 * @alter contains the flag indicating whether changes are to be made.
1268 * Return 0 if permission is granted.
1269 *
1270 * @ptrace_access_check:
1271 * Check permission before allowing the current process to trace the
1272 * @child process.
1273 * Security modules may also want to perform a process tracing check
1274 * during an execve in the set_security or apply_creds hooks of
1275 * tracing check during an execve in the bprm_set_creds hook of
1276 * binprm_security_ops if the process is being traced and its security
1277 * attributes would be changed by the execve.
1278 * @child contains the task_struct structure for the target process.
1279 * @mode contains the PTRACE_MODE flags indicating the form of access.
1280 * Return 0 if permission is granted.
1281 * @ptrace_traceme:
1282 * Check that the @parent process has sufficient permission to trace the
1283 * current process before allowing the current process to present itself
1284 * to the @parent process for tracing.
1285 * The parent process will still have to undergo the ptrace_access_check
1286 * checks before it is allowed to trace this one.
1287 * @parent contains the task_struct structure for debugger process.
1288 * Return 0 if permission is granted.
1289 * @capget:
1290 * Get the @effective, @inheritable, and @permitted capability sets for
1291 * the @target process. The hook may also perform permission checking to
1292 * determine if the current process is allowed to see the capability sets
1293 * of the @target process.
1294 * @target contains the task_struct structure for target process.
1295 * @effective contains the effective capability set.
1296 * @inheritable contains the inheritable capability set.
1297 * @permitted contains the permitted capability set.
1298 * Return 0 if the capability sets were successfully obtained.
1299 * @capset:
1300 * Set the @effective, @inheritable, and @permitted capability sets for
1301 * the current process.
1302 * @new contains the new credentials structure for target process.
1303 * @old contains the current credentials structure for target process.
1304 * @effective contains the effective capability set.
1305 * @inheritable contains the inheritable capability set.
1306 * @permitted contains the permitted capability set.
1307 * Return 0 and update @new if permission is granted.
1308 * @capable:
1309 * Check whether the @tsk process has the @cap capability in the indicated
1310 * credentials.
1311 * @tsk contains the task_struct for the process.
1312 * @cred contains the credentials to use.
1313 * @cap contains the capability <include/linux/capability.h>.
1314 * @audit: Whether to write an audit message or not
1315 * Return 0 if the capability is granted for @tsk.
1316 * @acct:
1317 * Check permission before enabling or disabling process accounting. If
1318 * accounting is being enabled, then @file refers to the open file used to
1319 * store accounting records. If accounting is being disabled, then @file
1320 * is NULL.
1321 * @file contains the file structure for the accounting file (may be NULL).
1322 * Return 0 if permission is granted.
1323 * @sysctl:
1324 * Check permission before accessing the @table sysctl variable in the
1325 * manner specified by @op.
1326 * @table contains the ctl_table structure for the sysctl variable.
1327 * @op contains the operation (001 = search, 002 = write, 004 = read).
1328 * Return 0 if permission is granted.
1329 * @syslog:
1330 * Check permission before accessing the kernel message ring or changing
1331 * logging to the console.
1332 * See the syslog(2) manual page for an explanation of the @type values.
1333 * @type contains the type of action.
1334 * Return 0 if permission is granted.
1335 * @settime:
1336 * Check permission to change the system time.
1337 * struct timespec and timezone are defined in include/linux/time.h
1338 * @ts contains new time
1339 * @tz contains new timezone
1340 * Return 0 if permission is granted.
1341 * @vm_enough_memory:
1342 * Check permissions for allocating a new virtual mapping.
1343 * @mm contains the mm struct it is being added to.
1344 * @pages contains the number of pages.
1345 * Return 0 if permission is granted.
1346 *
1347 * @secid_to_secctx:
1348 * Convert secid to security context.
1349 * @secid contains the security ID.
1350 * @secdata contains the pointer that stores the converted security context.
1351 * @secctx_to_secid:
1352 * Convert security context to secid.
1353 * @secid contains the pointer to the generated security ID.
1354 * @secdata contains the security context.
1355 *
1356 * @release_secctx:
1357 * Release the security context.
1358 * @secdata contains the security context.
1359 * @seclen contains the length of the security context.
1360 *
1361 * Security hooks for Audit
1362 *
1363 * @audit_rule_init:
1364 * Allocate and initialize an LSM audit rule structure.
1365 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1366 * @op contains the operator the rule uses.
1367 * @rulestr contains the context where the rule will be applied to.
1368 * @lsmrule contains a pointer to receive the result.
1369 * Return 0 if @lsmrule has been successfully set,
1370 * -EINVAL in case of an invalid rule.
1371 *
1372 * @audit_rule_known:
1373 * Specifies whether given @rule contains any fields related to current LSM.
1374 * @rule contains the audit rule of interest.
1375 * Return 1 in case of relation found, 0 otherwise.
1376 *
1377 * @audit_rule_match:
1378 * Determine if given @secid matches a rule previously approved
1379 * by @audit_rule_known.
1380 * @secid contains the security id in question.
1381 * @field contains the field which relates to current LSM.
1382 * @op contains the operator that will be used for matching.
1383 * @rule points to the audit rule that will be checked against.
1384 * @actx points to the audit context associated with the check.
1385 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1386 *
1387 * @audit_rule_free:
1388 * Deallocate the LSM audit rule structure previously allocated by
1389 * audit_rule_init.
1390 * @rule contains the allocated rule
1391 *
1392 * @inode_notifysecctx:
1393 * Notify the security module of what the security context of an inode
1394 * should be. Initializes the incore security context managed by the
1395 * security module for this inode. Example usage: NFS client invokes
1396 * this hook to initialize the security context in its incore inode to the
1397 * value provided by the server for the file when the server returned the
1398 * file's attributes to the client.
1399 *
1400 * Must be called with inode->i_mutex locked.
1401 *
1402 * @inode we wish to set the security context of.
1403 * @ctx contains the string which we wish to set in the inode.
1404 * @ctxlen contains the length of @ctx.
1405 *
1406 * @inode_setsecctx:
1407 * Change the security context of an inode. Updates the
1408 * incore security context managed by the security module and invokes the
1409 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1410 * xattrs that represent the context. Example usage: NFS server invokes
1411 * this hook to change the security context in its incore inode and on the
1412 * backing filesystem to a value provided by the client on a SETATTR
1413 * operation.
1414 *
1415 * Must be called with inode->i_mutex locked.
1416 *
1417 * @dentry contains the inode we wish to set the security context of.
1418 * @ctx contains the string which we wish to set in the inode.
1419 * @ctxlen contains the length of @ctx.
1420 *
1421 * @inode_getsecctx:
1422 * Returns a string containing all relavent security context information
1423 *
1424 * @inode we wish to set the security context of.
1425 * @ctx is a pointer in which to place the allocated security context.
1426 * @ctxlen points to the place to put the length of @ctx.
1427 * This is the main security structure.
1428 */
1484 #ifdef CONFIG_SECURITY_PATH
1498 #endif
1532 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1533 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1562 gfp_t gfp);
1639 #ifdef CONFIG_SECURITY_NETWORK
1663 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1680 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1683 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1688 u32 secid);
1698 /* key management security hooks */
1699 #ifdef CONFIG_KEYS
1704 key_perm_t perm);
1711 #ifdef CONFIG_AUDIT
1718 };
1720 /* prototypes */
1725 /* Security operations */
1804 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1805 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1893 };
1896 {
1897 }
1900 {
1901 }
1903 /*
1904 * This is the default capabilities functionality. Most of these functions
1905 * are just stubbed out, but a few must call the proper capable code.
1906 */
1909 {
1911 }
1915 {
1917 }
1920 {
1922 }
1928 {
1930 }
1937 {
1939 }
1942 {
1944 }
1947 {
1954 }
1958 {
1963 SECURITY_CAP_NOAUDIT);
1966 }
1969 {
1971 }
1974 {
1976 }
1980 {
1982 }
1985 {
1987 }
1990 {
1992 }
1995 {
1997 }
2000 {
2003 }
2006 {
2009 }
2012 {
2013 /* If current->mm is a kernel thread then we will pass NULL,
2014 for this specific case that is fine */
2016 }
2019 {
2021 }
2024 {
2026 }
2029 {
2030 }
2033 {
2034 }
2037 {
2039 }
2042 {
2044 }
2047 { }
2050 {
2052 }
2055 {
2057 }
2061 {
2063 }
2066 {
2068 }
2073 {
2075 }
2079 {
2081 }
2084 {
2086 }
2089 { }
2092 { }
2096 { }
2100 { }
2104 {
2106 }
2110 { }
2114 {
2116 }
2120 { }
2123 {
2125 }
2128 {
2130 }
2133 { }
2140 {
2142 }
2147 {
2149 }
2154 {
2156 }
2160 {
2162 }
2167 {
2169 }
2174 {
2176 }
2180 {
2182 }
2187 {
2189 }
2195 {
2197 }
2200 {
2202 }
2206 {
2208 }
2211 {
2213 }
2217 {
2219 }
2223 {
2225 }
2228 { }
2232 {
2234 }
2238 { }
2242 {
2244 }
2247 {
2249 }
2253 {
2255 }
2258 {
2260 }
2263 {
2265 }
2267 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2268 {
2270 }
2272 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2273 {
2275 }
2277 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2278 {
2280 }
2283 {
2285 }
2288 {
2290 }
2293 {
2295 }
2298 { }
2302 {
2304 }
2311 {
2313 }
2318 {
2320 }
2323 {
2325 }
2329 {
2331 }
2334 {
2336 }
2341 {
2343 }
2346 {
2348 }
2352 {
2354 }
2357 {
2359 }
2362 {
2364 }
2367 { }
2371 gfp_t gfp)
2372 {
2374 }
2378 {
2379 }
2383 {
2384 }
2387 {
2389 }
2393 {
2395 }
2398 {
2400 }
2404 {
2406 }
2411 {
2413 }
2417 {
2419 }
2422 {
2424 }
2427 {
2429 }
2432 {
2434 }
2437 {
2439 }
2442 {
2444 }
2447 {
2449 }
2452 {
2454 }
2457 {
2459 }
2463 {
2465 }
2470 {
2472 }
2475 {
2477 }
2480 {
2482 }
2486 u32 secid)
2487 {
2489 }
2492 {
2494 }
2500 {
2502 }
2505 { }
2509 {
2511 }
2514 {
2516 }
2519 {
2521 }
2524 { }
2527 {
2529 }
2532 { }
2536 {
2538 }
2541 {
2543 }
2547 {
2549 }
2555 {
2557 }
2560 {
2562 }
2565 { }
2569 {
2571 }
2574 {
2576 }
2580 {
2582 }
2585 {
2587 }
2590 { }
2593 {
2595 }
2598 {
2600 }
2605 {
2607 }
2610 { }
2613 {
2615 }
2617 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2618 {
2620 }
2623 {
2625 }
2628 {
2630 }
2633 {
2635 }
2638 u32 seclen,
2640 {
2642 }
2645 {
2646 }
2649 {
2651 }
2653 {
2655 }
2657 {
2659 }
2662 #ifdef CONFIG_SECURITY_NETWORK
2706 {
2708 }
2712 {
2714 }
2718 {
2720 }
2726 {
2728 }
2733 {
2735 }
2740 {
2742 }
2745 {
2747 }
2751 {
2753 }
2757 {
2759 }
2764 {
2766 }
2769 {
2771 }
2774 {
2776 }
2780 {
2782 }
2786 {
2788 }
2791 {
2793 }
2796 {
2798 }
2802 {
2804 }
2806 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2807 {
2809 }
2812 {
2814 }
2817 {
2818 }
2821 {
2822 }
2825 {
2826 }
2828 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2829 {
2830 }
2833 {
2834 }
2838 {
2840 }
2844 {
2845 }
2849 {
2850 }
2853 {
2855 }
2858 {
2859 }
2862 {
2864 }
2867 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2886 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2887 {
2889 }
2891 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2892 {
2894 }
2897 {
2898 }
2901 {
2903 }
2907 {
2909 }
2913 {
2915 }
2918 {
2919 }
2922 {
2924 }
2927 {
2929 }
2933 {
2935 }
2938 {
2940 }
2943 {
2944 }
2948 #ifdef CONFIG_SECURITY_PATH
2964 {
2966 }
2970 {
2972 }
2975 {
2977 }
2981 {
2983 }
2987 {
2989 }
2993 {
2995 }
3000 {
3002 }
3008 {
3010 }
3013 #ifdef CONFIG_KEYS
3014 #ifdef CONFIG_SECURITY
3025 #else
3030 {
3032 }
3035 {
3036 }
3040 key_perm_t perm)
3041 {
3043 }
3046 {
3049 }
3054 {
3056 }
3058 #endif
3061 #ifdef CONFIG_AUDIT
3062 #ifdef CONFIG_SECURITY
3069 #else
3073 {
3075 }
3078 {
3080 }
3084 {
3086 }
3089 { }
3094 #ifdef CONFIG_SECURITYFS
3106 {
3108 }
3111 mode_t mode,
3115 {
3117 }
3120 {}
3122 #endif
3124 #ifdef CONFIG_SECURITY
3127 {
3129 }
3132 {
3134 }
3136 #else
3139 {
3141 }
3144 { }