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1 /*
2 * Linux Security plug
3 *
4 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
5 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
7 * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
8 * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * Due to this file being licensed under the GPL there is controversy over
16 * whether this permits you to write a module that #includes this file
17 * without placing your module under the GPL. Please consult a lawyer for
18 * advice before doing this.
19 *
20 */
22 #ifndef __LINUX_SECURITY_H
23 #define __LINUX_SECURITY_H
25 #include <linux/fs.h>
26 #include <linux/binfmts.h>
27 #include <linux/signal.h>
28 #include <linux/resource.h>
29 #include <linux/sem.h>
30 #include <linux/shm.h>
32 #include <linux/msg.h>
33 #include <linux/sched.h>
34 #include <linux/key.h>
35 #include <linux/xfrm.h>
36 #include <linux/gfp.h>
37 #include <net/flow.h>
39 /* Maximum number of letters for an LSM name string */
40 #define SECURITY_NAME_MAX 10
42 /* If capable should audit the security request */
43 #define SECURITY_CAP_NOAUDIT 0
44 #define SECURITY_CAP_AUDIT 1
49 /*
50 * These functions are in security/capability.c and are used
51 * as the default capabilities functions
52 */
58 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
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 * @path_chmod:
458 * Check for permission to change DAC's permission of a file or directory.
459 * @dentry contains the dentry structure.
460 * @mnt contains the vfsmnt structure.
461 * @mode contains DAC's mode.
462 * Return 0 if permission is granted.
463 * @path_chown:
464 * Check for permission to change owner/group of a file or directory.
465 * @path contains the path structure.
466 * @uid contains new owner's ID.
467 * @gid contains new group's ID.
468 * Return 0 if permission is granted.
469 * @path_chroot:
470 * Check for permission to change root directory.
471 * @path contains the path structure.
472 * Return 0 if permission is granted.
473 * @inode_readlink:
474 * Check the permission to read the symbolic link.
475 * @dentry contains the dentry structure for the file link.
476 * Return 0 if permission is granted.
477 * @inode_follow_link:
478 * Check permission to follow a symbolic link when looking up a pathname.
479 * @dentry contains the dentry structure for the link.
480 * @nd contains the nameidata structure for the parent directory.
481 * Return 0 if permission is granted.
482 * @inode_permission:
483 * Check permission before accessing an inode. This hook is called by the
484 * existing Linux permission function, so a security module can use it to
485 * provide additional checking for existing Linux permission checks.
486 * Notice that this hook is called when a file is opened (as well as many
487 * other operations), whereas the file_security_ops permission hook is
488 * called when the actual read/write operations are performed.
489 * @inode contains the inode structure to check.
490 * @mask contains the permission mask.
491 * @nd contains the nameidata (may be NULL).
492 * Return 0 if permission is granted.
493 * @inode_setattr:
494 * Check permission before setting file attributes. Note that the kernel
495 * call to notify_change is performed from several locations, whenever
496 * file attributes change (such as when a file is truncated, chown/chmod
497 * operations, transferring disk quotas, etc).
498 * @dentry contains the dentry structure for the file.
499 * @attr is the iattr structure containing the new file attributes.
500 * Return 0 if permission is granted.
501 * @path_truncate:
502 * Check permission before truncating a file.
503 * @path contains the path structure for the file.
504 * @length is the new length of the file.
505 * @time_attrs is the flags passed to do_truncate().
506 * Return 0 if permission is granted.
507 * @inode_getattr:
508 * Check permission before obtaining file attributes.
509 * @mnt is the vfsmount where the dentry was looked up
510 * @dentry contains the dentry structure for the file.
511 * Return 0 if permission is granted.
512 * @inode_delete:
513 * @inode contains the inode structure for deleted inode.
514 * This hook is called when a deleted inode is released (i.e. an inode
515 * with no hard links has its use count drop to zero). A security module
516 * can use this hook to release any persistent label associated with the
517 * inode.
518 * @inode_setxattr:
519 * Check permission before setting the extended attributes
520 * @value identified by @name for @dentry.
521 * Return 0 if permission is granted.
522 * @inode_post_setxattr:
523 * Update inode security field after successful setxattr operation.
524 * @value identified by @name for @dentry.
525 * @inode_getxattr:
526 * Check permission before obtaining the extended attributes
527 * identified by @name for @dentry.
528 * Return 0 if permission is granted.
529 * @inode_listxattr:
530 * Check permission before obtaining the list of extended attribute
531 * names for @dentry.
532 * Return 0 if permission is granted.
533 * @inode_removexattr:
534 * Check permission before removing the extended attribute
535 * identified by @name for @dentry.
536 * Return 0 if permission is granted.
537 * @inode_getsecurity:
538 * Retrieve a copy of the extended attribute representation of the
539 * security label associated with @name for @inode via @buffer. Note that
540 * @name is the remainder of the attribute name after the security prefix
541 * has been removed. @alloc is used to specify of the call should return a
542 * value via the buffer or just the value length Return size of buffer on
543 * success.
544 * @inode_setsecurity:
545 * Set the security label associated with @name for @inode from the
546 * extended attribute value @value. @size indicates the size of the
547 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
548 * Note that @name is the remainder of the attribute name after the
549 * security. prefix has been removed.
550 * Return 0 on success.
551 * @inode_listsecurity:
552 * Copy the extended attribute names for the security labels
553 * associated with @inode into @buffer. The maximum size of @buffer
554 * is specified by @buffer_size. @buffer may be NULL to request
555 * the size of the buffer required.
556 * Returns number of bytes used/required on success.
557 * @inode_need_killpriv:
558 * Called when an inode has been changed.
559 * @dentry is the dentry being changed.
560 * Return <0 on error to abort the inode change operation.
561 * Return 0 if inode_killpriv does not need to be called.
562 * Return >0 if inode_killpriv does need to be called.
563 * @inode_killpriv:
564 * The setuid bit is being removed. Remove similar security labels.
565 * Called with the dentry->d_inode->i_mutex held.
566 * @dentry is the dentry being changed.
567 * Return 0 on success. If error is returned, then the operation
568 * causing setuid bit removal is failed.
569 * @inode_getsecid:
570 * Get the secid associated with the node.
571 * @inode contains a pointer to the inode.
572 * @secid contains a pointer to the location where result will be saved.
573 * In case of failure, @secid will be set to zero.
574 *
575 * Security hooks for file operations
576 *
577 * @file_permission:
578 * Check file permissions before accessing an open file. This hook is
579 * called by various operations that read or write files. A security
580 * module can use this hook to perform additional checking on these
581 * operations, e.g. to revalidate permissions on use to support privilege
582 * bracketing or policy changes. Notice that this hook is used when the
583 * actual read/write operations are performed, whereas the
584 * inode_security_ops hook is called when a file is opened (as well as
585 * many other operations).
586 * Caveat: Although this hook can be used to revalidate permissions for
587 * various system call operations that read or write files, it does not
588 * address the revalidation of permissions for memory-mapped files.
589 * Security modules must handle this separately if they need such
590 * revalidation.
591 * @file contains the file structure being accessed.
592 * @mask contains the requested permissions.
593 * Return 0 if permission is granted.
594 * @file_alloc_security:
595 * Allocate and attach a security structure to the file->f_security field.
596 * The security field is initialized to NULL when the structure is first
597 * created.
598 * @file contains the file structure to secure.
599 * Return 0 if the hook is successful and permission is granted.
600 * @file_free_security:
601 * Deallocate and free any security structures stored in file->f_security.
602 * @file contains the file structure being modified.
603 * @file_ioctl:
604 * @file contains the file structure.
605 * @cmd contains the operation to perform.
606 * @arg contains the operational arguments.
607 * Check permission for an ioctl operation on @file. Note that @arg can
608 * sometimes represents a user space pointer; in other cases, it may be a
609 * simple integer value. When @arg represents a user space pointer, it
610 * should never be used by the security module.
611 * Return 0 if permission is granted.
612 * @file_mmap :
613 * Check permissions for a mmap operation. The @file may be NULL, e.g.
614 * if mapping anonymous memory.
615 * @file contains the file structure for file to map (may be NULL).
616 * @reqprot contains the protection requested by the application.
617 * @prot contains the protection that will be applied by the kernel.
618 * @flags contains the operational flags.
619 * Return 0 if permission is granted.
620 * @file_mprotect:
621 * Check permissions before changing memory access permissions.
622 * @vma contains the memory region to modify.
623 * @reqprot contains the protection requested by the application.
624 * @prot contains the protection that will be applied by the kernel.
625 * Return 0 if permission is granted.
626 * @file_lock:
627 * Check permission before performing file locking operations.
628 * Note: this hook mediates both flock and fcntl style locks.
629 * @file contains the file structure.
630 * @cmd contains the posix-translated lock operation to perform
631 * (e.g. F_RDLCK, F_WRLCK).
632 * Return 0 if permission is granted.
633 * @file_fcntl:
634 * Check permission before allowing the file operation specified by @cmd
635 * from being performed on the file @file. Note that @arg can sometimes
636 * represents a user space pointer; in other cases, it may be a simple
637 * integer value. When @arg represents a user space pointer, it should
638 * never be used by the security module.
639 * @file contains the file structure.
640 * @cmd contains the operation to be performed.
641 * @arg contains the operational arguments.
642 * Return 0 if permission is granted.
643 * @file_set_fowner:
644 * Save owner security information (typically from current->security) in
645 * file->f_security for later use by the send_sigiotask hook.
646 * @file contains the file structure to update.
647 * Return 0 on success.
648 * @file_send_sigiotask:
649 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
650 * process @tsk. Note that this hook is sometimes called from interrupt.
651 * Note that the fown_struct, @fown, is never outside the context of a
652 * struct file, so the file structure (and associated security information)
653 * can always be obtained:
654 * container_of(fown, struct file, f_owner)
655 * @tsk contains the structure of task receiving signal.
656 * @fown contains the file owner information.
657 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
658 * Return 0 if permission is granted.
659 * @file_receive:
660 * This hook allows security modules to control the ability of a process
661 * to receive an open file descriptor via socket IPC.
662 * @file contains the file structure being received.
663 * Return 0 if permission is granted.
664 *
665 * Security hook for dentry
666 *
667 * @dentry_open
668 * Save open-time permission checking state for later use upon
669 * file_permission, and recheck access if anything has changed
670 * since inode_permission.
671 *
672 * Security hooks for task operations.
673 *
674 * @task_create:
675 * Check permission before creating a child process. See the clone(2)
676 * manual page for definitions of the @clone_flags.
677 * @clone_flags contains the flags indicating what should be shared.
678 * Return 0 if permission is granted.
679 * @cred_alloc_blank:
680 * @cred points to the credentials.
681 * @gfp indicates the atomicity of any memory allocations.
682 * Only allocate sufficient memory and attach to @cred such that
683 * cred_transfer() will not get ENOMEM.
684 * @cred_free:
685 * @cred points to the credentials.
686 * Deallocate and clear the cred->security field in a set of credentials.
687 * @cred_prepare:
688 * @new points to the new credentials.
689 * @old points to the original credentials.
690 * @gfp indicates the atomicity of any memory allocations.
691 * Prepare a new set of credentials by copying the data from the old set.
692 * @cred_commit:
693 * @new points to the new credentials.
694 * @old points to the original credentials.
695 * Install a new set of credentials.
696 * @cred_transfer:
697 * @new points to the new credentials.
698 * @old points to the original credentials.
699 * Transfer data from original creds to new creds
700 * @kernel_act_as:
701 * Set the credentials for a kernel service to act as (subjective context).
702 * @new points to the credentials to be modified.
703 * @secid specifies the security ID to be set
704 * The current task must be the one that nominated @secid.
705 * Return 0 if successful.
706 * @kernel_create_files_as:
707 * Set the file creation context in a set of credentials to be the same as
708 * the objective context of the specified inode.
709 * @new points to the credentials to be modified.
710 * @inode points to the inode to use as a reference.
711 * The current task must be the one that nominated @inode.
712 * Return 0 if successful.
713 * @kernel_module_request:
714 * Ability to trigger the kernel to automatically upcall to userspace for
715 * userspace to load a kernel module with the given name.
716 * @kmod_name name of the module requested by the kernel
717 * Return 0 if successful.
718 * @task_setuid:
719 * Check permission before setting one or more of the user identity
720 * attributes of the current process. The @flags parameter indicates
721 * which of the set*uid system calls invoked this hook and how to
722 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
723 * definitions at the beginning of this file for the @flags values and
724 * their meanings.
725 * @id0 contains a uid.
726 * @id1 contains a uid.
727 * @id2 contains a uid.
728 * @flags contains one of the LSM_SETID_* values.
729 * Return 0 if permission is granted.
730 * @task_fix_setuid:
731 * Update the module's state after setting one or more of the user
732 * identity attributes of the current process. The @flags parameter
733 * indicates which of the set*uid system calls invoked this hook. If
734 * @new is the set of credentials that will be installed. Modifications
735 * should be made to this rather than to @current->cred.
736 * @old is the set of credentials that are being replaces
737 * @flags contains one of the LSM_SETID_* values.
738 * Return 0 on success.
739 * @task_setgid:
740 * Check permission before setting one or more of the group identity
741 * attributes of the current process. The @flags parameter indicates
742 * which of the set*gid system calls invoked this hook and how to
743 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
744 * definitions at the beginning of this file for the @flags values and
745 * their meanings.
746 * @id0 contains a gid.
747 * @id1 contains a gid.
748 * @id2 contains a gid.
749 * @flags contains one of the LSM_SETID_* values.
750 * Return 0 if permission is granted.
751 * @task_setpgid:
752 * Check permission before setting the process group identifier of the
753 * process @p to @pgid.
754 * @p contains the task_struct for process being modified.
755 * @pgid contains the new pgid.
756 * Return 0 if permission is granted.
757 * @task_getpgid:
758 * Check permission before getting the process group identifier of the
759 * process @p.
760 * @p contains the task_struct for the process.
761 * Return 0 if permission is granted.
762 * @task_getsid:
763 * Check permission before getting the session identifier of the process
764 * @p.
765 * @p contains the task_struct for the process.
766 * Return 0 if permission is granted.
767 * @task_getsecid:
768 * Retrieve the security identifier of the process @p.
769 * @p contains the task_struct for the process and place is into @secid.
770 * In case of failure, @secid will be set to zero.
771 *
772 * @task_setgroups:
773 * Check permission before setting the supplementary group set of the
774 * current process.
775 * @group_info contains the new group information.
776 * Return 0 if permission is granted.
777 * @task_setnice:
778 * Check permission before setting the nice value of @p to @nice.
779 * @p contains the task_struct of process.
780 * @nice contains the new nice value.
781 * Return 0 if permission is granted.
782 * @task_setioprio
783 * Check permission before setting the ioprio value of @p to @ioprio.
784 * @p contains the task_struct of process.
785 * @ioprio contains the new ioprio value
786 * Return 0 if permission is granted.
787 * @task_getioprio
788 * Check permission before getting the ioprio value of @p.
789 * @p contains the task_struct of process.
790 * Return 0 if permission is granted.
791 * @task_setrlimit:
792 * Check permission before setting the resource limits of the current
793 * process for @resource to @new_rlim. The old resource limit values can
794 * be examined by dereferencing (current->signal->rlim + resource).
795 * @resource contains the resource whose limit is being set.
796 * @new_rlim contains the new limits for @resource.
797 * Return 0 if permission is granted.
798 * @task_setscheduler:
799 * Check permission before setting scheduling policy and/or parameters of
800 * process @p based on @policy and @lp.
801 * @p contains the task_struct for process.
802 * @policy contains the scheduling policy.
803 * @lp contains the scheduling parameters.
804 * Return 0 if permission is granted.
805 * @task_getscheduler:
806 * Check permission before obtaining scheduling information for process
807 * @p.
808 * @p contains the task_struct for process.
809 * Return 0 if permission is granted.
810 * @task_movememory
811 * Check permission before moving memory owned by process @p.
812 * @p contains the task_struct for process.
813 * Return 0 if permission is granted.
814 * @task_kill:
815 * Check permission before sending signal @sig to @p. @info can be NULL,
816 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
817 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
818 * from the kernel and should typically be permitted.
819 * SIGIO signals are handled separately by the send_sigiotask hook in
820 * file_security_ops.
821 * @p contains the task_struct for process.
822 * @info contains the signal information.
823 * @sig contains the signal value.
824 * @secid contains the sid of the process where the signal originated
825 * Return 0 if permission is granted.
826 * @task_wait:
827 * Check permission before allowing a process to reap a child process @p
828 * and collect its status information.
829 * @p contains the task_struct for process.
830 * Return 0 if permission is granted.
831 * @task_prctl:
832 * Check permission before performing a process control operation on the
833 * current process.
834 * @option contains the operation.
835 * @arg2 contains a argument.
836 * @arg3 contains a argument.
837 * @arg4 contains a argument.
838 * @arg5 contains a argument.
839 * Return -ENOSYS if no-one wanted to handle this op, any other value to
840 * cause prctl() to return immediately with that value.
841 * @task_to_inode:
842 * Set the security attributes for an inode based on an associated task's
843 * security attributes, e.g. for /proc/pid inodes.
844 * @p contains the task_struct for the task.
845 * @inode contains the inode structure for the inode.
846 *
847 * Security hooks for Netlink messaging.
848 *
849 * @netlink_send:
850 * Save security information for a netlink message so that permission
851 * checking can be performed when the message is processed. The security
852 * information can be saved using the eff_cap field of the
853 * netlink_skb_parms structure. Also may be used to provide fine
854 * grained control over message transmission.
855 * @sk associated sock of task sending the message.,
856 * @skb contains the sk_buff structure for the netlink message.
857 * Return 0 if the information was successfully saved and message
858 * is allowed to be transmitted.
859 * @netlink_recv:
860 * Check permission before processing the received netlink message in
861 * @skb.
862 * @skb contains the sk_buff structure for the netlink message.
863 * @cap indicates the capability required
864 * Return 0 if permission is granted.
865 *
866 * Security hooks for Unix domain networking.
867 *
868 * @unix_stream_connect:
869 * Check permissions before establishing a Unix domain stream connection
870 * between @sock and @other.
871 * @sock contains the socket structure.
872 * @other contains the peer socket structure.
873 * Return 0 if permission is granted.
874 * @unix_may_send:
875 * Check permissions before connecting or sending datagrams from @sock to
876 * @other.
877 * @sock contains the socket structure.
878 * @sock contains the peer socket structure.
879 * Return 0 if permission is granted.
880 *
881 * The @unix_stream_connect and @unix_may_send hooks were necessary because
882 * Linux provides an alternative to the conventional file name space for Unix
883 * domain sockets. Whereas binding and connecting to sockets in the file name
884 * space is mediated by the typical file permissions (and caught by the mknod
885 * and permission hooks in inode_security_ops), binding and connecting to
886 * sockets in the abstract name space is completely unmediated. Sufficient
887 * control of Unix domain sockets in the abstract name space isn't possible
888 * using only the socket layer hooks, since we need to know the actual target
889 * socket, which is not looked up until we are inside the af_unix code.
890 *
891 * Security hooks for socket operations.
892 *
893 * @socket_create:
894 * Check permissions prior to creating a new socket.
895 * @family contains the requested protocol family.
896 * @type contains the requested communications type.
897 * @protocol contains the requested protocol.
898 * @kern set to 1 if a kernel socket.
899 * Return 0 if permission is granted.
900 * @socket_post_create:
901 * This hook allows a module to update or allocate a per-socket security
902 * structure. Note that the security field was not added directly to the
903 * socket structure, but rather, the socket security information is stored
904 * in the associated inode. Typically, the inode alloc_security hook will
905 * allocate and and attach security information to
906 * sock->inode->i_security. This hook may be used to update the
907 * sock->inode->i_security field with additional information that wasn't
908 * available when the inode was allocated.
909 * @sock contains the newly created socket structure.
910 * @family contains the requested protocol family.
911 * @type contains the requested communications type.
912 * @protocol contains the requested protocol.
913 * @kern set to 1 if a kernel socket.
914 * @socket_bind:
915 * Check permission before socket protocol layer bind operation is
916 * performed and the socket @sock is bound to the address specified in the
917 * @address parameter.
918 * @sock contains the socket structure.
919 * @address contains the address to bind to.
920 * @addrlen contains the length of address.
921 * Return 0 if permission is granted.
922 * @socket_connect:
923 * Check permission before socket protocol layer connect operation
924 * attempts to connect socket @sock to a remote address, @address.
925 * @sock contains the socket structure.
926 * @address contains the address of remote endpoint.
927 * @addrlen contains the length of address.
928 * Return 0 if permission is granted.
929 * @socket_listen:
930 * Check permission before socket protocol layer listen operation.
931 * @sock contains the socket structure.
932 * @backlog contains the maximum length for the pending connection queue.
933 * Return 0 if permission is granted.
934 * @socket_accept:
935 * Check permission before accepting a new connection. Note that the new
936 * socket, @newsock, has been created and some information copied to it,
937 * but the accept operation has not actually been performed.
938 * @sock contains the listening socket structure.
939 * @newsock contains the newly created server socket for connection.
940 * Return 0 if permission is granted.
941 * @socket_sendmsg:
942 * Check permission before transmitting a message to another socket.
943 * @sock contains the socket structure.
944 * @msg contains the message to be transmitted.
945 * @size contains the size of message.
946 * Return 0 if permission is granted.
947 * @socket_recvmsg:
948 * Check permission before receiving a message from a socket.
949 * @sock contains the socket structure.
950 * @msg contains the message structure.
951 * @size contains the size of message structure.
952 * @flags contains the operational flags.
953 * Return 0 if permission is granted.
954 * @socket_getsockname:
955 * Check permission before the local address (name) of the socket object
956 * @sock is retrieved.
957 * @sock contains the socket structure.
958 * Return 0 if permission is granted.
959 * @socket_getpeername:
960 * Check permission before the remote address (name) of a socket object
961 * @sock is retrieved.
962 * @sock contains the socket structure.
963 * Return 0 if permission is granted.
964 * @socket_getsockopt:
965 * Check permissions before retrieving the options associated with socket
966 * @sock.
967 * @sock contains the socket structure.
968 * @level contains the protocol level to retrieve option from.
969 * @optname contains the name of option to retrieve.
970 * Return 0 if permission is granted.
971 * @socket_setsockopt:
972 * Check permissions before setting the options associated with socket
973 * @sock.
974 * @sock contains the socket structure.
975 * @level contains the protocol level to set options for.
976 * @optname contains the name of the option to set.
977 * Return 0 if permission is granted.
978 * @socket_shutdown:
979 * Checks permission before all or part of a connection on the socket
980 * @sock is shut down.
981 * @sock contains the socket structure.
982 * @how contains the flag indicating how future sends and receives are handled.
983 * Return 0 if permission is granted.
984 * @socket_sock_rcv_skb:
985 * Check permissions on incoming network packets. This hook is distinct
986 * from Netfilter's IP input hooks since it is the first time that the
987 * incoming sk_buff @skb has been associated with a particular socket, @sk.
988 * @sk contains the sock (not socket) associated with the incoming sk_buff.
989 * @skb contains the incoming network data.
990 * @socket_getpeersec_stream:
991 * This hook allows the security module to provide peer socket security
992 * state for unix or connected tcp sockets to userspace via getsockopt
993 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
994 * socket is associated with an ipsec SA.
995 * @sock is the local socket.
996 * @optval userspace memory where the security state is to be copied.
997 * @optlen userspace int where the module should copy the actual length
998 * of the security state.
999 * @len as input is the maximum length to copy to userspace provided
1000 * by the caller.
1001 * Return 0 if all is well, otherwise, typical getsockopt return
1002 * values.
1003 * @socket_getpeersec_dgram:
1004 * This hook allows the security module to provide peer socket security
1005 * state for udp sockets on a per-packet basis to userspace via
1006 * getsockopt SO_GETPEERSEC. The application must first have indicated
1007 * the IP_PASSSEC option via getsockopt. It can then retrieve the
1008 * security state returned by this hook for a packet via the SCM_SECURITY
1009 * ancillary message type.
1010 * @skb is the skbuff for the packet being queried
1011 * @secdata is a pointer to a buffer in which to copy the security data
1012 * @seclen is the maximum length for @secdata
1013 * Return 0 on success, error on failure.
1014 * @sk_alloc_security:
1015 * Allocate and attach a security structure to the sk->sk_security field,
1016 * which is used to copy security attributes between local stream sockets.
1017 * @sk_free_security:
1018 * Deallocate security structure.
1019 * @sk_clone_security:
1020 * Clone/copy security structure.
1021 * @sk_getsecid:
1022 * Retrieve the LSM-specific secid for the sock to enable caching of network
1023 * authorizations.
1024 * @sock_graft:
1025 * Sets the socket's isec sid to the sock's sid.
1026 * @inet_conn_request:
1027 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
1028 * @inet_csk_clone:
1029 * Sets the new child socket's sid to the openreq sid.
1030 * @inet_conn_established:
1031 * Sets the connection's peersid to the secmark on skb.
1032 * @req_classify_flow:
1033 * Sets the flow's sid to the openreq sid.
1034 * @tun_dev_create:
1035 * Check permissions prior to creating a new TUN device.
1036 * @tun_dev_post_create:
1037 * This hook allows a module to update or allocate a per-socket security
1038 * structure.
1039 * @sk contains the newly created sock structure.
1040 * @tun_dev_attach:
1041 * Check permissions prior to attaching to a persistent TUN device. This
1042 * hook can also be used by the module to update any security state
1043 * associated with the TUN device's sock structure.
1044 * @sk contains the existing sock structure.
1045 *
1046 * Security hooks for XFRM operations.
1047 *
1048 * @xfrm_policy_alloc_security:
1049 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1050 * Database used by the XFRM system.
1051 * @sec_ctx contains the security context information being provided by
1052 * the user-level policy update program (e.g., setkey).
1053 * Allocate a security structure to the xp->security field; the security
1054 * field is initialized to NULL when the xfrm_policy is allocated.
1055 * Return 0 if operation was successful (memory to allocate, legal context)
1056 * @xfrm_policy_clone_security:
1057 * @old_ctx contains an existing xfrm_sec_ctx.
1058 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1059 * Allocate a security structure in new_ctxp that contains the
1060 * information from the old_ctx structure.
1061 * Return 0 if operation was successful (memory to allocate).
1062 * @xfrm_policy_free_security:
1063 * @ctx contains the xfrm_sec_ctx
1064 * Deallocate xp->security.
1065 * @xfrm_policy_delete_security:
1066 * @ctx contains the xfrm_sec_ctx.
1067 * Authorize deletion of xp->security.
1068 * @xfrm_state_alloc_security:
1069 * @x contains the xfrm_state being added to the Security Association
1070 * Database by the XFRM system.
1071 * @sec_ctx contains the security context information being provided by
1072 * the user-level SA generation program (e.g., setkey or racoon).
1073 * @secid contains the secid from which to take the mls portion of the context.
1074 * Allocate a security structure to the x->security field; the security
1075 * field is initialized to NULL when the xfrm_state is allocated. Set the
1076 * context to correspond to either sec_ctx or polsec, with the mls portion
1077 * taken from secid in the latter case.
1078 * Return 0 if operation was successful (memory to allocate, legal context).
1079 * @xfrm_state_free_security:
1080 * @x contains the xfrm_state.
1081 * Deallocate x->security.
1082 * @xfrm_state_delete_security:
1083 * @x contains the xfrm_state.
1084 * Authorize deletion of x->security.
1085 * @xfrm_policy_lookup:
1086 * @ctx contains the xfrm_sec_ctx for which the access control is being
1087 * checked.
1088 * @fl_secid contains the flow security label that is used to authorize
1089 * access to the policy xp.
1090 * @dir contains the direction of the flow (input or output).
1091 * Check permission when a flow selects a xfrm_policy for processing
1092 * XFRMs on a packet. The hook is called when selecting either a
1093 * per-socket policy or a generic xfrm policy.
1094 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1095 * on other errors.
1096 * @xfrm_state_pol_flow_match:
1097 * @x contains the state to match.
1098 * @xp contains the policy to check for a match.
1099 * @fl contains the flow to check for a match.
1100 * Return 1 if there is a match.
1101 * @xfrm_decode_session:
1102 * @skb points to skb to decode.
1103 * @secid points to the flow key secid to set.
1104 * @ckall says if all xfrms used should be checked for same secid.
1105 * Return 0 if ckall is zero or all xfrms used have the same secid.
1106 *
1107 * Security hooks affecting all Key Management operations
1108 *
1109 * @key_alloc:
1110 * Permit allocation of a key and assign security data. Note that key does
1111 * not have a serial number assigned at this point.
1112 * @key points to the key.
1113 * @flags is the allocation flags
1114 * Return 0 if permission is granted, -ve error otherwise.
1115 * @key_free:
1116 * Notification of destruction; free security data.
1117 * @key points to the key.
1118 * No return value.
1119 * @key_permission:
1120 * See whether a specific operational right is granted to a process on a
1121 * key.
1122 * @key_ref refers to the key (key pointer + possession attribute bit).
1123 * @cred points to the credentials to provide the context against which to
1124 * evaluate the security data on the key.
1125 * @perm describes the combination of permissions required of this key.
1126 * Return 1 if permission granted, 0 if permission denied and -ve it the
1127 * normal permissions model should be effected.
1128 * @key_getsecurity:
1129 * Get a textual representation of the security context attached to a key
1130 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1131 * allocates the storage for the NUL-terminated string and the caller
1132 * should free it.
1133 * @key points to the key to be queried.
1134 * @_buffer points to a pointer that should be set to point to the
1135 * resulting string (if no label or an error occurs).
1136 * Return the length of the string (including terminating NUL) or -ve if
1137 * an error.
1138 * May also return 0 (and a NULL buffer pointer) if there is no label.
1139 * @key_session_to_parent:
1140 * Forcibly assign the session keyring from a process to its parent
1141 * process.
1142 * @cred: Pointer to process's credentials
1143 * @parent_cred: Pointer to parent process's credentials
1144 * @keyring: Proposed new session keyring
1145 * Return 0 if permission is granted, -ve error otherwise.
1146 *
1147 * Security hooks affecting all System V IPC operations.
1148 *
1149 * @ipc_permission:
1150 * Check permissions for access to IPC
1151 * @ipcp contains the kernel IPC permission structure
1152 * @flag contains the desired (requested) permission set
1153 * Return 0 if permission is granted.
1154 * @ipc_getsecid:
1155 * Get the secid associated with the ipc object.
1156 * @ipcp contains the kernel IPC permission structure.
1157 * @secid contains a pointer to the location where result will be saved.
1158 * In case of failure, @secid will be set to zero.
1159 *
1160 * Security hooks for individual messages held in System V IPC message queues
1161 * @msg_msg_alloc_security:
1162 * Allocate and attach a security structure to the msg->security field.
1163 * The security field is initialized to NULL when the structure is first
1164 * created.
1165 * @msg contains the message structure to be modified.
1166 * Return 0 if operation was successful and permission is granted.
1167 * @msg_msg_free_security:
1168 * Deallocate the security structure for this message.
1169 * @msg contains the message structure to be modified.
1170 *
1171 * Security hooks for System V IPC Message Queues
1172 *
1173 * @msg_queue_alloc_security:
1174 * Allocate and attach a security structure to the
1175 * msq->q_perm.security field. The security field is initialized to
1176 * NULL when the structure is first created.
1177 * @msq contains the message queue structure to be modified.
1178 * Return 0 if operation was successful and permission is granted.
1179 * @msg_queue_free_security:
1180 * Deallocate security structure for this message queue.
1181 * @msq contains the message queue structure to be modified.
1182 * @msg_queue_associate:
1183 * Check permission when a message queue is requested through the
1184 * msgget system call. This hook is only called when returning the
1185 * message queue identifier for an existing message queue, not when a
1186 * new message queue is created.
1187 * @msq contains the message queue to act upon.
1188 * @msqflg contains the operation control flags.
1189 * Return 0 if permission is granted.
1190 * @msg_queue_msgctl:
1191 * Check permission when a message control operation specified by @cmd
1192 * is to be performed on the message queue @msq.
1193 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1194 * @msq contains the message queue to act upon. May be NULL.
1195 * @cmd contains the operation to be performed.
1196 * Return 0 if permission is granted.
1197 * @msg_queue_msgsnd:
1198 * Check permission before a message, @msg, is enqueued on the message
1199 * queue, @msq.
1200 * @msq contains the message queue to send message to.
1201 * @msg contains the message to be enqueued.
1202 * @msqflg contains operational flags.
1203 * Return 0 if permission is granted.
1204 * @msg_queue_msgrcv:
1205 * Check permission before a message, @msg, is removed from the message
1206 * queue, @msq. The @target task structure contains a pointer to the
1207 * process that will be receiving the message (not equal to the current
1208 * process when inline receives are being performed).
1209 * @msq contains the message queue to retrieve message from.
1210 * @msg contains the message destination.
1211 * @target contains the task structure for recipient process.
1212 * @type contains the type of message requested.
1213 * @mode contains the operational flags.
1214 * Return 0 if permission is granted.
1215 *
1216 * Security hooks for System V Shared Memory Segments
1217 *
1218 * @shm_alloc_security:
1219 * Allocate and attach a security structure to the shp->shm_perm.security
1220 * field. The security field is initialized to NULL when the structure is
1221 * first created.
1222 * @shp contains the shared memory structure to be modified.
1223 * Return 0 if operation was successful and permission is granted.
1224 * @shm_free_security:
1225 * Deallocate the security struct for this memory segment.
1226 * @shp contains the shared memory structure to be modified.
1227 * @shm_associate:
1228 * Check permission when a shared memory region is requested through the
1229 * shmget system call. This hook is only called when returning the shared
1230 * memory region identifier for an existing region, not when a new shared
1231 * memory region is created.
1232 * @shp contains the shared memory structure to be modified.
1233 * @shmflg contains the operation control flags.
1234 * Return 0 if permission is granted.
1235 * @shm_shmctl:
1236 * Check permission when a shared memory control operation specified by
1237 * @cmd is to be performed on the shared memory region @shp.
1238 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1239 * @shp contains shared memory structure to be modified.
1240 * @cmd contains the operation to be performed.
1241 * Return 0 if permission is granted.
1242 * @shm_shmat:
1243 * Check permissions prior to allowing the shmat system call to attach the
1244 * shared memory segment @shp to the data segment of the calling process.
1245 * The attaching address is specified by @shmaddr.
1246 * @shp contains the shared memory structure to be modified.
1247 * @shmaddr contains the address to attach memory region to.
1248 * @shmflg contains the operational flags.
1249 * Return 0 if permission is granted.
1250 *
1251 * Security hooks for System V Semaphores
1252 *
1253 * @sem_alloc_security:
1254 * Allocate and attach a security structure to the sma->sem_perm.security
1255 * field. The security field is initialized to NULL when the structure is
1256 * first created.
1257 * @sma contains the semaphore structure
1258 * Return 0 if operation was successful and permission is granted.
1259 * @sem_free_security:
1260 * deallocate security struct for this semaphore
1261 * @sma contains the semaphore structure.
1262 * @sem_associate:
1263 * Check permission when a semaphore is requested through the semget
1264 * system call. This hook is only called when returning the semaphore
1265 * identifier for an existing semaphore, not when a new one must be
1266 * created.
1267 * @sma contains the semaphore structure.
1268 * @semflg contains the operation control flags.
1269 * Return 0 if permission is granted.
1270 * @sem_semctl:
1271 * Check permission when a semaphore operation specified by @cmd is to be
1272 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1273 * IPC_INFO or SEM_INFO.
1274 * @sma contains the semaphore structure. May be NULL.
1275 * @cmd contains the operation to be performed.
1276 * Return 0 if permission is granted.
1277 * @sem_semop
1278 * Check permissions before performing operations on members of the
1279 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1280 * may be modified.
1281 * @sma contains the semaphore structure.
1282 * @sops contains the operations to perform.
1283 * @nsops contains the number of operations to perform.
1284 * @alter contains the flag indicating whether changes are to be made.
1285 * Return 0 if permission is granted.
1286 *
1287 * @ptrace_access_check:
1288 * Check permission before allowing the current process to trace the
1289 * @child process.
1290 * Security modules may also want to perform a process tracing check
1291 * during an execve in the set_security or apply_creds hooks of
1292 * tracing check during an execve in the bprm_set_creds hook of
1293 * binprm_security_ops if the process is being traced and its security
1294 * attributes would be changed by the execve.
1295 * @child contains the task_struct structure for the target process.
1296 * @mode contains the PTRACE_MODE flags indicating the form of access.
1297 * Return 0 if permission is granted.
1298 * @ptrace_traceme:
1299 * Check that the @parent process has sufficient permission to trace the
1300 * current process before allowing the current process to present itself
1301 * to the @parent process for tracing.
1302 * The parent process will still have to undergo the ptrace_access_check
1303 * checks before it is allowed to trace this one.
1304 * @parent contains the task_struct structure for debugger process.
1305 * Return 0 if permission is granted.
1306 * @capget:
1307 * Get the @effective, @inheritable, and @permitted capability sets for
1308 * the @target process. The hook may also perform permission checking to
1309 * determine if the current process is allowed to see the capability sets
1310 * of the @target process.
1311 * @target contains the task_struct structure for target process.
1312 * @effective contains the effective capability set.
1313 * @inheritable contains the inheritable capability set.
1314 * @permitted contains the permitted capability set.
1315 * Return 0 if the capability sets were successfully obtained.
1316 * @capset:
1317 * Set the @effective, @inheritable, and @permitted capability sets for
1318 * the current process.
1319 * @new contains the new credentials structure for target process.
1320 * @old contains the current credentials structure for target process.
1321 * @effective contains the effective capability set.
1322 * @inheritable contains the inheritable capability set.
1323 * @permitted contains the permitted capability set.
1324 * Return 0 and update @new if permission is granted.
1325 * @capable:
1326 * Check whether the @tsk process has the @cap capability in the indicated
1327 * credentials.
1328 * @tsk contains the task_struct for the process.
1329 * @cred contains the credentials to use.
1330 * @cap contains the capability <include/linux/capability.h>.
1331 * @audit: Whether to write an audit message or not
1332 * Return 0 if the capability is granted for @tsk.
1333 * @acct:
1334 * Check permission before enabling or disabling process accounting. If
1335 * accounting is being enabled, then @file refers to the open file used to
1336 * store accounting records. If accounting is being disabled, then @file
1337 * is NULL.
1338 * @file contains the file structure for the accounting file (may be NULL).
1339 * Return 0 if permission is granted.
1340 * @sysctl:
1341 * Check permission before accessing the @table sysctl variable in the
1342 * manner specified by @op.
1343 * @table contains the ctl_table structure for the sysctl variable.
1344 * @op contains the operation (001 = search, 002 = write, 004 = read).
1345 * Return 0 if permission is granted.
1346 * @syslog:
1347 * Check permission before accessing the kernel message ring or changing
1348 * logging to the console.
1349 * See the syslog(2) manual page for an explanation of the @type values.
1350 * @type contains the type of action.
1351 * Return 0 if permission is granted.
1352 * @settime:
1353 * Check permission to change the system time.
1354 * struct timespec and timezone are defined in include/linux/time.h
1355 * @ts contains new time
1356 * @tz contains new timezone
1357 * Return 0 if permission is granted.
1358 * @vm_enough_memory:
1359 * Check permissions for allocating a new virtual mapping.
1360 * @mm contains the mm struct it is being added to.
1361 * @pages contains the number of pages.
1362 * Return 0 if permission is granted.
1363 *
1364 * @secid_to_secctx:
1365 * Convert secid to security context.
1366 * @secid contains the security ID.
1367 * @secdata contains the pointer that stores the converted security context.
1368 * @secctx_to_secid:
1369 * Convert security context to secid.
1370 * @secid contains the pointer to the generated security ID.
1371 * @secdata contains the security context.
1372 *
1373 * @release_secctx:
1374 * Release the security context.
1375 * @secdata contains the security context.
1376 * @seclen contains the length of the security context.
1377 *
1378 * Security hooks for Audit
1379 *
1380 * @audit_rule_init:
1381 * Allocate and initialize an LSM audit rule structure.
1382 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1383 * @op contains the operator the rule uses.
1384 * @rulestr contains the context where the rule will be applied to.
1385 * @lsmrule contains a pointer to receive the result.
1386 * Return 0 if @lsmrule has been successfully set,
1387 * -EINVAL in case of an invalid rule.
1388 *
1389 * @audit_rule_known:
1390 * Specifies whether given @rule contains any fields related to current LSM.
1391 * @rule contains the audit rule of interest.
1392 * Return 1 in case of relation found, 0 otherwise.
1393 *
1394 * @audit_rule_match:
1395 * Determine if given @secid matches a rule previously approved
1396 * by @audit_rule_known.
1397 * @secid contains the security id in question.
1398 * @field contains the field which relates to current LSM.
1399 * @op contains the operator that will be used for matching.
1400 * @rule points to the audit rule that will be checked against.
1401 * @actx points to the audit context associated with the check.
1402 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1403 *
1404 * @audit_rule_free:
1405 * Deallocate the LSM audit rule structure previously allocated by
1406 * audit_rule_init.
1407 * @rule contains the allocated rule
1408 *
1409 * @inode_notifysecctx:
1410 * Notify the security module of what the security context of an inode
1411 * should be. Initializes the incore security context managed by the
1412 * security module for this inode. Example usage: NFS client invokes
1413 * this hook to initialize the security context in its incore inode to the
1414 * value provided by the server for the file when the server returned the
1415 * file's attributes to the client.
1416 *
1417 * Must be called with inode->i_mutex locked.
1418 *
1419 * @inode we wish to set the security context of.
1420 * @ctx contains the string which we wish to set in the inode.
1421 * @ctxlen contains the length of @ctx.
1422 *
1423 * @inode_setsecctx:
1424 * Change the security context of an inode. Updates the
1425 * incore security context managed by the security module and invokes the
1426 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1427 * xattrs that represent the context. Example usage: NFS server invokes
1428 * this hook to change the security context in its incore inode and on the
1429 * backing filesystem to a value provided by the client on a SETATTR
1430 * operation.
1431 *
1432 * Must be called with inode->i_mutex locked.
1433 *
1434 * @dentry contains the inode we wish to set the security context of.
1435 * @ctx contains the string which we wish to set in the inode.
1436 * @ctxlen contains the length of @ctx.
1437 *
1438 * @inode_getsecctx:
1439 * Returns a string containing all relavent security context information
1440 *
1441 * @inode we wish to set the security context of.
1442 * @ctx is a pointer in which to place the allocated security context.
1443 * @ctxlen points to the place to put the length of @ctx.
1444 * This is the main security structure.
1445 */
1501 #ifdef CONFIG_SECURITY_PATH
1516 mode_t mode);
1519 #endif
1553 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1554 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1583 gfp_t gfp);
1660 #ifdef CONFIG_SECURITY_NETWORK
1684 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1701 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1704 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1709 u32 secid);
1719 /* key management security hooks */
1720 #ifdef CONFIG_KEYS
1725 key_perm_t perm);
1732 #ifdef CONFIG_AUDIT
1739 };
1741 /* prototypes */
1746 /* Security operations */
1825 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1826 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1914 };
1917 {
1918 }
1921 {
1922 }
1924 /*
1925 * This is the default capabilities functionality. Most of these functions
1926 * are just stubbed out, but a few must call the proper capable code.
1927 */
1930 {
1932 }
1936 {
1938 }
1941 {
1943 }
1949 {
1951 }
1958 {
1960 }
1963 {
1965 }
1968 {
1975 }
1979 {
1984 SECURITY_CAP_NOAUDIT);
1987 }
1990 {
1992 }
1995 {
1997 }
2001 {
2003 }
2006 {
2008 }
2011 {
2013 }
2016 {
2018 }
2021 {
2024 }
2027 {
2030 }
2033 {
2034 /* If current->mm is a kernel thread then we will pass NULL,
2035 for this specific case that is fine */
2037 }
2040 {
2042 }
2045 {
2047 }
2050 {
2051 }
2054 {
2055 }
2058 {
2060 }
2063 {
2065 }
2068 { }
2071 {
2073 }
2076 {
2078 }
2082 {
2084 }
2087 {
2089 }
2094 {
2096 }
2100 {
2102 }
2105 {
2107 }
2110 { }
2113 { }
2117 { }
2121 { }
2125 {
2127 }
2131 { }
2135 {
2137 }
2141 { }
2144 {
2146 }
2149 {
2151 }
2154 { }
2161 {
2163 }
2168 {
2170 }
2175 {
2177 }
2181 {
2183 }
2188 {
2190 }
2195 {
2197 }
2201 {
2203 }
2208 {
2210 }
2216 {
2218 }
2221 {
2223 }
2227 {
2229 }
2232 {
2234 }
2238 {
2240 }
2244 {
2246 }
2249 { }
2253 {
2255 }
2259 { }
2263 {
2265 }
2268 {
2270 }
2274 {
2276 }
2279 {
2281 }
2284 {
2286 }
2288 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2289 {
2291 }
2293 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2294 {
2296 }
2298 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2299 {
2301 }
2304 {
2306 }
2309 {
2311 }
2314 {
2316 }
2319 { }
2323 {
2325 }
2332 {
2334 }
2339 {
2341 }
2344 {
2346 }
2350 {
2352 }
2355 {
2357 }
2362 {
2364 }
2367 {
2369 }
2373 {
2375 }
2378 {
2380 }
2383 {
2385 }
2388 { }
2392 gfp_t gfp)
2393 {
2395 }
2399 {
2400 }
2404 {
2405 }
2408 {
2410 }
2414 {
2416 }
2419 {
2421 }
2425 {
2427 }
2432 {
2434 }
2438 {
2440 }
2443 {
2445 }
2448 {
2450 }
2453 {
2455 }
2458 {
2460 }
2463 {
2465 }
2468 {
2470 }
2473 {
2475 }
2478 {
2480 }
2484 {
2486 }
2491 {
2493 }
2496 {
2498 }
2501 {
2503 }
2507 u32 secid)
2508 {
2510 }
2513 {
2515 }
2521 {
2523 }
2526 { }
2530 {
2532 }
2535 {
2537 }
2540 {
2542 }
2545 { }
2548 {
2550 }
2553 { }
2557 {
2559 }
2562 {
2564 }
2568 {
2570 }
2576 {
2578 }
2581 {
2583 }
2586 { }
2590 {
2592 }
2595 {
2597 }
2601 {
2603 }
2606 {
2608 }
2611 { }
2614 {
2616 }
2619 {
2621 }
2626 {
2628 }
2631 { }
2634 {
2636 }
2638 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2639 {
2641 }
2644 {
2646 }
2649 {
2651 }
2654 {
2656 }
2659 u32 seclen,
2661 {
2663 }
2666 {
2667 }
2670 {
2672 }
2674 {
2676 }
2678 {
2680 }
2683 #ifdef CONFIG_SECURITY_NETWORK
2727 {
2729 }
2733 {
2735 }
2739 {
2741 }
2747 {
2749 }
2754 {
2756 }
2761 {
2763 }
2766 {
2768 }
2772 {
2774 }
2778 {
2780 }
2785 {
2787 }
2790 {
2792 }
2795 {
2797 }
2801 {
2803 }
2807 {
2809 }
2812 {
2814 }
2817 {
2819 }
2823 {
2825 }
2827 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2828 {
2830 }
2833 {
2835 }
2838 {
2839 }
2842 {
2843 }
2846 {
2847 }
2849 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2850 {
2851 }
2854 {
2855 }
2859 {
2861 }
2865 {
2866 }
2870 {
2871 }
2874 {
2876 }
2879 {
2880 }
2883 {
2885 }
2888 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2907 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2908 {
2910 }
2912 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2913 {
2915 }
2918 {
2919 }
2922 {
2924 }
2928 {
2930 }
2934 {
2936 }
2939 {
2940 }
2943 {
2945 }
2948 {
2950 }
2954 {
2956 }
2959 {
2961 }
2964 {
2965 }
2969 #ifdef CONFIG_SECURITY_PATH
2984 mode_t mode);
2989 {
2991 }
2995 {
2997 }
3000 {
3002 }
3006 {
3008 }
3012 {
3014 }
3018 {
3020 }
3025 {
3027 }
3033 {
3035 }
3039 mode_t mode)
3040 {
3042 }
3045 {
3047 }
3050 {
3052 }
3055 #ifdef CONFIG_KEYS
3056 #ifdef CONFIG_SECURITY
3067 #else
3072 {
3074 }
3077 {
3078 }
3082 key_perm_t perm)
3083 {
3085 }
3088 {
3091 }
3096 {
3098 }
3100 #endif
3103 #ifdef CONFIG_AUDIT
3104 #ifdef CONFIG_SECURITY
3111 #else
3115 {
3117 }
3120 {
3122 }
3126 {
3128 }
3131 { }
3136 #ifdef CONFIG_SECURITYFS
3148 {
3150 }
3153 mode_t mode,
3157 {
3159 }
3162 {}
3164 #endif
3166 #ifdef CONFIG_SECURITY
3169 {
3171 }
3174 {
3176 }
3178 #else
3181 {
3183 }
3186 { }