| blob | c642bb8b8f5a4894b3878a0977a017b684efefe4 |
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/fsnotify.h>
27 #include <linux/binfmts.h>
28 #include <linux/signal.h>
29 #include <linux/resource.h>
30 #include <linux/sem.h>
31 #include <linux/shm.h>
33 #include <linux/msg.h>
34 #include <linux/sched.h>
35 #include <linux/key.h>
36 #include <linux/xfrm.h>
37 #include <linux/slab.h>
38 #include <net/flow.h>
40 /* Maximum number of letters for an LSM name string */
41 #define SECURITY_NAME_MAX 10
43 /* If capable should audit the security request */
44 #define SECURITY_CAP_NOAUDIT 0
45 #define SECURITY_CAP_AUDIT 1
50 /*
51 * These functions are in security/capability.c and are used
52 * as the default capabilities functions
53 */
59 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
100 #ifdef CONFIG_MMU
103 #else
104 #define dac_mmap_min_addr 0UL
105 #endif
107 /*
108 * Values used in the task_security_ops calls
109 */
110 /* setuid or setgid, id0 == uid or gid */
111 #define LSM_SETID_ID 1
113 /* setreuid or setregid, id0 == real, id1 == eff */
114 #define LSM_SETID_RE 2
116 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
117 #define LSM_SETID_RES 4
119 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
120 #define LSM_SETID_FS 8
122 /* forward declares to avoid warnings */
126 /* bprm->unsafe reasons */
127 #define LSM_UNSAFE_SHARE 1
128 #define LSM_UNSAFE_PTRACE 2
129 #define LSM_UNSAFE_PTRACE_CAP 4
131 #ifdef CONFIG_MMU
132 /*
133 * If a hint addr is less than mmap_min_addr change hint to be as
134 * low as possible but still greater than mmap_min_addr
135 */
137 {
143 }
146 #endif
148 #ifdef CONFIG_SECURITY
154 };
157 {
161 }
164 {
174 }
176 /**
177 * struct security_operations - main security structure
178 *
179 * Security module identifier.
180 *
181 * @name:
182 * A string that acts as a unique identifeir for the LSM with max number
183 * of characters = SECURITY_NAME_MAX.
184 *
185 * Security hooks for program execution operations.
186 *
187 * @bprm_set_creds:
188 * Save security information in the bprm->security field, typically based
189 * on information about the bprm->file, for later use by the apply_creds
190 * hook. This hook may also optionally check permissions (e.g. for
191 * transitions between security domains).
192 * This hook may be called multiple times during a single execve, e.g. for
193 * interpreters. The hook can tell whether it has already been called by
194 * checking to see if @bprm->security is non-NULL. If so, then the hook
195 * may decide either to retain the security information saved earlier or
196 * to replace it.
197 * @bprm contains the linux_binprm structure.
198 * Return 0 if the hook is successful and permission is granted.
199 * @bprm_check_security:
200 * This hook mediates the point when a search for a binary handler will
201 * begin. It allows a check the @bprm->security value which is set in the
202 * preceding set_creds call. The primary difference from set_creds is
203 * that the argv list and envp list are reliably available in @bprm. This
204 * hook may be called multiple times during a single execve; and in each
205 * pass set_creds is called first.
206 * @bprm contains the linux_binprm structure.
207 * Return 0 if the hook is successful and permission is granted.
208 * @bprm_committing_creds:
209 * Prepare to install the new security attributes of a process being
210 * transformed by an execve operation, based on the old credentials
211 * pointed to by @current->cred and the information set in @bprm->cred by
212 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
213 * This hook is a good place to perform state changes on the process such
214 * as closing open file descriptors to which access will no longer be
215 * granted when the attributes are changed. This is called immediately
216 * before commit_creds().
217 * @bprm_committed_creds:
218 * Tidy up after the installation of the new security attributes of a
219 * process being transformed by an execve operation. The new credentials
220 * have, by this point, been set to @current->cred. @bprm points to the
221 * linux_binprm structure. This hook is a good place to perform state
222 * changes on the process such as clearing out non-inheritable signal
223 * state. This is called immediately after commit_creds().
224 * @bprm_secureexec:
225 * Return a boolean value (0 or 1) indicating whether a "secure exec"
226 * is required. The flag is passed in the auxiliary table
227 * on the initial stack to the ELF interpreter to indicate whether libc
228 * should enable secure mode.
229 * @bprm contains the linux_binprm structure.
230 *
231 * Security hooks for filesystem operations.
232 *
233 * @sb_alloc_security:
234 * Allocate and attach a security structure to the sb->s_security field.
235 * The s_security field is initialized to NULL when the structure is
236 * allocated.
237 * @sb contains the super_block structure to be modified.
238 * Return 0 if operation was successful.
239 * @sb_free_security:
240 * Deallocate and clear the sb->s_security field.
241 * @sb contains the super_block structure to be modified.
242 * @sb_statfs:
243 * Check permission before obtaining filesystem statistics for the @mnt
244 * mountpoint.
245 * @dentry is a handle on the superblock for the filesystem.
246 * Return 0 if permission is granted.
247 * @sb_mount:
248 * Check permission before an object specified by @dev_name is mounted on
249 * the mount point named by @nd. For an ordinary mount, @dev_name
250 * identifies a device if the file system type requires a device. For a
251 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
252 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
253 * pathname of the object being mounted.
254 * @dev_name contains the name for object being mounted.
255 * @path contains the path for mount point object.
256 * @type contains the filesystem type.
257 * @flags contains the mount flags.
258 * @data contains the filesystem-specific data.
259 * Return 0 if permission is granted.
260 * @sb_copy_data:
261 * Allow mount option data to be copied prior to parsing by the filesystem,
262 * so that the security module can extract security-specific mount
263 * options cleanly (a filesystem may modify the data e.g. with strsep()).
264 * This also allows the original mount data to be stripped of security-
265 * specific options to avoid having to make filesystems aware of them.
266 * @type the type of filesystem being mounted.
267 * @orig the original mount data copied from userspace.
268 * @copy copied data which will be passed to the security module.
269 * Returns 0 if the copy was successful.
270 * @sb_umount:
271 * Check permission before the @mnt file system is unmounted.
272 * @mnt contains the mounted file system.
273 * @flags contains the unmount flags, e.g. MNT_FORCE.
274 * Return 0 if permission is granted.
275 * @sb_pivotroot:
276 * Check permission before pivoting the root filesystem.
277 * @old_path contains the path for the new location of the current root (put_old).
278 * @new_path contains the path for the new root (new_root).
279 * Return 0 if permission is granted.
280 * @sb_set_mnt_opts:
281 * Set the security relevant mount options used for a superblock
282 * @sb the superblock to set security mount options for
283 * @opts binary data structure containing all lsm mount data
284 * @sb_clone_mnt_opts:
285 * Copy all security options from a given superblock to another
286 * @oldsb old superblock which contain information to clone
287 * @newsb new superblock which needs filled in
288 * @sb_parse_opts_str:
289 * Parse a string of security data filling in the opts structure
290 * @options string containing all mount options known by the LSM
291 * @opts binary data structure usable by the LSM
292 *
293 * Security hooks for inode operations.
294 *
295 * @inode_alloc_security:
296 * Allocate and attach a security structure to @inode->i_security. The
297 * i_security field is initialized to NULL when the inode structure is
298 * allocated.
299 * @inode contains the inode structure.
300 * Return 0 if operation was successful.
301 * @inode_free_security:
302 * @inode contains the inode structure.
303 * Deallocate the inode security structure and set @inode->i_security to
304 * NULL.
305 * @inode_init_security:
306 * Obtain the security attribute name suffix and value to set on a newly
307 * created inode and set up the incore security field for the new inode.
308 * This hook is called by the fs code as part of the inode creation
309 * transaction and provides for atomic labeling of the inode, unlike
310 * the post_create/mkdir/... hooks called by the VFS. The hook function
311 * is expected to allocate the name and value via kmalloc, with the caller
312 * being responsible for calling kfree after using them.
313 * If the security module does not use security attributes or does
314 * not wish to put a security attribute on this particular inode,
315 * then it should return -EOPNOTSUPP to skip this processing.
316 * @inode contains the inode structure of the newly created inode.
317 * @dir contains the inode structure of the parent directory.
318 * @name will be set to the allocated name suffix (e.g. selinux).
319 * @value will be set to the allocated attribute value.
320 * @len will be set to the length of the value.
321 * Returns 0 if @name and @value have been successfully set,
322 * -EOPNOTSUPP if no security attribute is needed, or
323 * -ENOMEM on memory allocation failure.
324 * @inode_create:
325 * Check permission to create a regular file.
326 * @dir contains inode structure of the parent of the new file.
327 * @dentry contains the dentry structure for the file to be created.
328 * @mode contains the file mode of the file to be created.
329 * Return 0 if permission is granted.
330 * @inode_link:
331 * Check permission before creating a new hard link to a file.
332 * @old_dentry contains the dentry structure for an existing link to the file.
333 * @dir contains the inode structure of the parent directory of the new link.
334 * @new_dentry contains the dentry structure for the new link.
335 * Return 0 if permission is granted.
336 * @path_link:
337 * Check permission before creating a new hard link to a file.
338 * @old_dentry contains the dentry structure for an existing link
339 * to the file.
340 * @new_dir contains the path structure of the parent directory of
341 * the new link.
342 * @new_dentry contains the dentry structure for the new link.
343 * Return 0 if permission is granted.
344 * @inode_unlink:
345 * Check the permission to remove a hard link to a file.
346 * @dir contains the inode structure of parent directory of the file.
347 * @dentry contains the dentry structure for file to be unlinked.
348 * Return 0 if permission is granted.
349 * @path_unlink:
350 * Check the permission to remove a hard link to a file.
351 * @dir contains the path structure of parent directory of the file.
352 * @dentry contains the dentry structure for file to be unlinked.
353 * Return 0 if permission is granted.
354 * @inode_symlink:
355 * Check the permission to create a symbolic link to a file.
356 * @dir contains the inode structure of parent directory of the symbolic link.
357 * @dentry contains the dentry structure of the symbolic link.
358 * @old_name contains the pathname of file.
359 * Return 0 if permission is granted.
360 * @path_symlink:
361 * Check the permission to create a symbolic link to a file.
362 * @dir contains the path structure of parent directory of
363 * the symbolic link.
364 * @dentry contains the dentry structure of the symbolic link.
365 * @old_name contains the pathname of file.
366 * Return 0 if permission is granted.
367 * @inode_mkdir:
368 * Check permissions to create a new directory in the existing directory
369 * associated with inode strcture @dir.
370 * @dir containst the inode structure of parent of the directory to be created.
371 * @dentry contains the dentry structure of new directory.
372 * @mode contains the mode of new directory.
373 * Return 0 if permission is granted.
374 * @path_mkdir:
375 * Check permissions to create a new directory in the existing directory
376 * associated with path strcture @path.
377 * @dir containst the path structure of parent of the directory
378 * to be created.
379 * @dentry contains the dentry structure of new directory.
380 * @mode contains the mode of new directory.
381 * Return 0 if permission is granted.
382 * @inode_rmdir:
383 * Check the permission to remove a directory.
384 * @dir contains the inode structure of parent of the directory to be removed.
385 * @dentry contains the dentry structure of directory to be removed.
386 * Return 0 if permission is granted.
387 * @path_rmdir:
388 * Check the permission to remove a directory.
389 * @dir contains the path structure of parent of the directory to be
390 * removed.
391 * @dentry contains the dentry structure of directory to be removed.
392 * Return 0 if permission is granted.
393 * @inode_mknod:
394 * Check permissions when creating a special file (or a socket or a fifo
395 * file created via the mknod system call). Note that if mknod operation
396 * is being done for a regular file, then the create hook will be called
397 * and not this hook.
398 * @dir contains the inode structure of parent of the new file.
399 * @dentry contains the dentry structure of the new file.
400 * @mode contains the mode of the new file.
401 * @dev contains the device number.
402 * Return 0 if permission is granted.
403 * @path_mknod:
404 * Check permissions when creating a file. Note that this hook is called
405 * even if mknod operation is being done for a regular file.
406 * @dir contains the path structure of parent of the new file.
407 * @dentry contains the dentry structure of the new file.
408 * @mode contains the mode of the new file.
409 * @dev contains the undecoded device number. Use new_decode_dev() to get
410 * the decoded device number.
411 * Return 0 if permission is granted.
412 * @inode_rename:
413 * Check for permission to rename a file or directory.
414 * @old_dir contains the inode structure for parent of the old link.
415 * @old_dentry contains the dentry structure of the old link.
416 * @new_dir contains the inode structure for parent of the new link.
417 * @new_dentry contains the dentry structure of the new link.
418 * Return 0 if permission is granted.
419 * @path_rename:
420 * Check for permission to rename a file or directory.
421 * @old_dir contains the path structure for parent of the old link.
422 * @old_dentry contains the dentry structure of the old link.
423 * @new_dir contains the path structure for parent of the new link.
424 * @new_dentry contains the dentry structure of the new link.
425 * Return 0 if permission is granted.
426 * @path_chmod:
427 * Check for permission to change DAC's permission of a file or directory.
428 * @dentry contains the dentry structure.
429 * @mnt contains the vfsmnt structure.
430 * @mode contains DAC's mode.
431 * Return 0 if permission is granted.
432 * @path_chown:
433 * Check for permission to change owner/group of a file or directory.
434 * @path contains the path structure.
435 * @uid contains new owner's ID.
436 * @gid contains new group's ID.
437 * Return 0 if permission is granted.
438 * @path_chroot:
439 * Check for permission to change root directory.
440 * @path contains the path structure.
441 * Return 0 if permission is granted.
442 * @inode_readlink:
443 * Check the permission to read the symbolic link.
444 * @dentry contains the dentry structure for the file link.
445 * Return 0 if permission is granted.
446 * @inode_follow_link:
447 * Check permission to follow a symbolic link when looking up a pathname.
448 * @dentry contains the dentry structure for the link.
449 * @nd contains the nameidata structure for the parent directory.
450 * Return 0 if permission is granted.
451 * @inode_permission:
452 * Check permission before accessing an inode. This hook is called by the
453 * existing Linux permission function, so a security module can use it to
454 * provide additional checking for existing Linux permission checks.
455 * Notice that this hook is called when a file is opened (as well as many
456 * other operations), whereas the file_security_ops permission hook is
457 * called when the actual read/write operations are performed.
458 * @inode contains the inode structure to check.
459 * @mask contains the permission mask.
460 * Return 0 if permission is granted.
461 * @inode_setattr:
462 * Check permission before setting file attributes. Note that the kernel
463 * call to notify_change is performed from several locations, whenever
464 * file attributes change (such as when a file is truncated, chown/chmod
465 * operations, transferring disk quotas, etc).
466 * @dentry contains the dentry structure for the file.
467 * @attr is the iattr structure containing the new file attributes.
468 * Return 0 if permission is granted.
469 * @path_truncate:
470 * Check permission before truncating a file.
471 * @path contains the path structure for the file.
472 * Return 0 if permission is granted.
473 * @inode_getattr:
474 * Check permission before obtaining file attributes.
475 * @mnt is the vfsmount where the dentry was looked up
476 * @dentry contains the dentry structure for the file.
477 * Return 0 if permission is granted.
478 * @inode_setxattr:
479 * Check permission before setting the extended attributes
480 * @value identified by @name for @dentry.
481 * Return 0 if permission is granted.
482 * @inode_post_setxattr:
483 * Update inode security field after successful setxattr operation.
484 * @value identified by @name for @dentry.
485 * @inode_getxattr:
486 * Check permission before obtaining the extended attributes
487 * identified by @name for @dentry.
488 * Return 0 if permission is granted.
489 * @inode_listxattr:
490 * Check permission before obtaining the list of extended attribute
491 * names for @dentry.
492 * Return 0 if permission is granted.
493 * @inode_removexattr:
494 * Check permission before removing the extended attribute
495 * identified by @name for @dentry.
496 * Return 0 if permission is granted.
497 * @inode_getsecurity:
498 * Retrieve a copy of the extended attribute representation of the
499 * security label associated with @name for @inode via @buffer. Note that
500 * @name is the remainder of the attribute name after the security prefix
501 * has been removed. @alloc is used to specify of the call should return a
502 * value via the buffer or just the value length Return size of buffer on
503 * success.
504 * @inode_setsecurity:
505 * Set the security label associated with @name for @inode from the
506 * extended attribute value @value. @size indicates the size of the
507 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
508 * Note that @name is the remainder of the attribute name after the
509 * security. prefix has been removed.
510 * Return 0 on success.
511 * @inode_listsecurity:
512 * Copy the extended attribute names for the security labels
513 * associated with @inode into @buffer. The maximum size of @buffer
514 * is specified by @buffer_size. @buffer may be NULL to request
515 * the size of the buffer required.
516 * Returns number of bytes used/required on success.
517 * @inode_need_killpriv:
518 * Called when an inode has been changed.
519 * @dentry is the dentry being changed.
520 * Return <0 on error to abort the inode change operation.
521 * Return 0 if inode_killpriv does not need to be called.
522 * Return >0 if inode_killpriv does need to be called.
523 * @inode_killpriv:
524 * The setuid bit is being removed. Remove similar security labels.
525 * Called with the dentry->d_inode->i_mutex held.
526 * @dentry is the dentry being changed.
527 * Return 0 on success. If error is returned, then the operation
528 * causing setuid bit removal is failed.
529 * @inode_getsecid:
530 * Get the secid associated with the node.
531 * @inode contains a pointer to the inode.
532 * @secid contains a pointer to the location where result will be saved.
533 * In case of failure, @secid will be set to zero.
534 *
535 * Security hooks for file operations
536 *
537 * @file_permission:
538 * Check file permissions before accessing an open file. This hook is
539 * called by various operations that read or write files. A security
540 * module can use this hook to perform additional checking on these
541 * operations, e.g. to revalidate permissions on use to support privilege
542 * bracketing or policy changes. Notice that this hook is used when the
543 * actual read/write operations are performed, whereas the
544 * inode_security_ops hook is called when a file is opened (as well as
545 * many other operations).
546 * Caveat: Although this hook can be used to revalidate permissions for
547 * various system call operations that read or write files, it does not
548 * address the revalidation of permissions for memory-mapped files.
549 * Security modules must handle this separately if they need such
550 * revalidation.
551 * @file contains the file structure being accessed.
552 * @mask contains the requested permissions.
553 * Return 0 if permission is granted.
554 * @file_alloc_security:
555 * Allocate and attach a security structure to the file->f_security field.
556 * The security field is initialized to NULL when the structure is first
557 * created.
558 * @file contains the file structure to secure.
559 * Return 0 if the hook is successful and permission is granted.
560 * @file_free_security:
561 * Deallocate and free any security structures stored in file->f_security.
562 * @file contains the file structure being modified.
563 * @file_ioctl:
564 * @file contains the file structure.
565 * @cmd contains the operation to perform.
566 * @arg contains the operational arguments.
567 * Check permission for an ioctl operation on @file. Note that @arg can
568 * sometimes represents a user space pointer; in other cases, it may be a
569 * simple integer value. When @arg represents a user space pointer, it
570 * should never be used by the security module.
571 * Return 0 if permission is granted.
572 * @file_mmap :
573 * Check permissions for a mmap operation. The @file may be NULL, e.g.
574 * if mapping anonymous memory.
575 * @file contains the file structure for file to map (may be NULL).
576 * @reqprot contains the protection requested by the application.
577 * @prot contains the protection that will be applied by the kernel.
578 * @flags contains the operational flags.
579 * Return 0 if permission is granted.
580 * @file_mprotect:
581 * Check permissions before changing memory access permissions.
582 * @vma contains the memory region to modify.
583 * @reqprot contains the protection requested by the application.
584 * @prot contains the protection that will be applied by the kernel.
585 * Return 0 if permission is granted.
586 * @file_lock:
587 * Check permission before performing file locking operations.
588 * Note: this hook mediates both flock and fcntl style locks.
589 * @file contains the file structure.
590 * @cmd contains the posix-translated lock operation to perform
591 * (e.g. F_RDLCK, F_WRLCK).
592 * Return 0 if permission is granted.
593 * @file_fcntl:
594 * Check permission before allowing the file operation specified by @cmd
595 * from being performed on the file @file. Note that @arg can sometimes
596 * represents a user space pointer; in other cases, it may be a simple
597 * integer value. When @arg represents a user space pointer, it should
598 * never be used by the security module.
599 * @file contains the file structure.
600 * @cmd contains the operation to be performed.
601 * @arg contains the operational arguments.
602 * Return 0 if permission is granted.
603 * @file_set_fowner:
604 * Save owner security information (typically from current->security) in
605 * file->f_security for later use by the send_sigiotask hook.
606 * @file contains the file structure to update.
607 * Return 0 on success.
608 * @file_send_sigiotask:
609 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
610 * process @tsk. Note that this hook is sometimes called from interrupt.
611 * Note that the fown_struct, @fown, is never outside the context of a
612 * struct file, so the file structure (and associated security information)
613 * can always be obtained:
614 * container_of(fown, struct file, f_owner)
615 * @tsk contains the structure of task receiving signal.
616 * @fown contains the file owner information.
617 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
618 * Return 0 if permission is granted.
619 * @file_receive:
620 * This hook allows security modules to control the ability of a process
621 * to receive an open file descriptor via socket IPC.
622 * @file contains the file structure being received.
623 * Return 0 if permission is granted.
624 *
625 * Security hook for dentry
626 *
627 * @dentry_open
628 * Save open-time permission checking state for later use upon
629 * file_permission, and recheck access if anything has changed
630 * since inode_permission.
631 *
632 * Security hooks for task operations.
633 *
634 * @task_create:
635 * Check permission before creating a child process. See the clone(2)
636 * manual page for definitions of the @clone_flags.
637 * @clone_flags contains the flags indicating what should be shared.
638 * Return 0 if permission is granted.
639 * @cred_alloc_blank:
640 * @cred points to the credentials.
641 * @gfp indicates the atomicity of any memory allocations.
642 * Only allocate sufficient memory and attach to @cred such that
643 * cred_transfer() will not get ENOMEM.
644 * @cred_free:
645 * @cred points to the credentials.
646 * Deallocate and clear the cred->security field in a set of credentials.
647 * @cred_prepare:
648 * @new points to the new credentials.
649 * @old points to the original credentials.
650 * @gfp indicates the atomicity of any memory allocations.
651 * Prepare a new set of credentials by copying the data from the old set.
652 * @cred_transfer:
653 * @new points to the new credentials.
654 * @old points to the original credentials.
655 * Transfer data from original creds to new creds
656 * @kernel_act_as:
657 * Set the credentials for a kernel service to act as (subjective context).
658 * @new points to the credentials to be modified.
659 * @secid specifies the security ID to be set
660 * The current task must be the one that nominated @secid.
661 * Return 0 if successful.
662 * @kernel_create_files_as:
663 * Set the file creation context in a set of credentials to be the same as
664 * the objective context of the specified inode.
665 * @new points to the credentials to be modified.
666 * @inode points to the inode to use as a reference.
667 * The current task must be the one that nominated @inode.
668 * Return 0 if successful.
669 * @kernel_module_request:
670 * Ability to trigger the kernel to automatically upcall to userspace for
671 * userspace to load a kernel module with the given name.
672 * @kmod_name name of the module requested by the kernel
673 * Return 0 if successful.
674 * @task_fix_setuid:
675 * Update the module's state after setting one or more of the user
676 * identity attributes of the current process. The @flags parameter
677 * indicates which of the set*uid system calls invoked this hook. If
678 * @new is the set of credentials that will be installed. Modifications
679 * should be made to this rather than to @current->cred.
680 * @old is the set of credentials that are being replaces
681 * @flags contains one of the LSM_SETID_* values.
682 * Return 0 on success.
683 * @task_setpgid:
684 * Check permission before setting the process group identifier of the
685 * process @p to @pgid.
686 * @p contains the task_struct for process being modified.
687 * @pgid contains the new pgid.
688 * Return 0 if permission is granted.
689 * @task_getpgid:
690 * Check permission before getting the process group identifier of the
691 * process @p.
692 * @p contains the task_struct for the process.
693 * Return 0 if permission is granted.
694 * @task_getsid:
695 * Check permission before getting the session identifier of the process
696 * @p.
697 * @p contains the task_struct for the process.
698 * Return 0 if permission is granted.
699 * @task_getsecid:
700 * Retrieve the security identifier of the process @p.
701 * @p contains the task_struct for the process and place is into @secid.
702 * In case of failure, @secid will be set to zero.
703 *
704 * @task_setnice:
705 * Check permission before setting the nice value of @p to @nice.
706 * @p contains the task_struct of process.
707 * @nice contains the new nice value.
708 * Return 0 if permission is granted.
709 * @task_setioprio
710 * Check permission before setting the ioprio value of @p to @ioprio.
711 * @p contains the task_struct of process.
712 * @ioprio contains the new ioprio value
713 * Return 0 if permission is granted.
714 * @task_getioprio
715 * Check permission before getting the ioprio value of @p.
716 * @p contains the task_struct of process.
717 * Return 0 if permission is granted.
718 * @task_setrlimit:
719 * Check permission before setting the resource limits of the current
720 * process for @resource to @new_rlim. The old resource limit values can
721 * be examined by dereferencing (current->signal->rlim + resource).
722 * @resource contains the resource whose limit is being set.
723 * @new_rlim contains the new limits for @resource.
724 * Return 0 if permission is granted.
725 * @task_setscheduler:
726 * Check permission before setting scheduling policy and/or parameters of
727 * process @p based on @policy and @lp.
728 * @p contains the task_struct for process.
729 * @policy contains the scheduling policy.
730 * @lp contains the scheduling parameters.
731 * Return 0 if permission is granted.
732 * @task_getscheduler:
733 * Check permission before obtaining scheduling information for process
734 * @p.
735 * @p contains the task_struct for process.
736 * Return 0 if permission is granted.
737 * @task_movememory
738 * Check permission before moving memory owned by process @p.
739 * @p contains the task_struct for process.
740 * Return 0 if permission is granted.
741 * @task_kill:
742 * Check permission before sending signal @sig to @p. @info can be NULL,
743 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
744 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
745 * from the kernel and should typically be permitted.
746 * SIGIO signals are handled separately by the send_sigiotask hook in
747 * file_security_ops.
748 * @p contains the task_struct for process.
749 * @info contains the signal information.
750 * @sig contains the signal value.
751 * @secid contains the sid of the process where the signal originated
752 * Return 0 if permission is granted.
753 * @task_wait:
754 * Check permission before allowing a process to reap a child process @p
755 * and collect its status information.
756 * @p contains the task_struct for process.
757 * Return 0 if permission is granted.
758 * @task_prctl:
759 * Check permission before performing a process control operation on the
760 * current process.
761 * @option contains the operation.
762 * @arg2 contains a argument.
763 * @arg3 contains a argument.
764 * @arg4 contains a argument.
765 * @arg5 contains a argument.
766 * Return -ENOSYS if no-one wanted to handle this op, any other value to
767 * cause prctl() to return immediately with that value.
768 * @task_to_inode:
769 * Set the security attributes for an inode based on an associated task's
770 * security attributes, e.g. for /proc/pid inodes.
771 * @p contains the task_struct for the task.
772 * @inode contains the inode structure for the inode.
773 *
774 * Security hooks for Netlink messaging.
775 *
776 * @netlink_send:
777 * Save security information for a netlink message so that permission
778 * checking can be performed when the message is processed. The security
779 * information can be saved using the eff_cap field of the
780 * netlink_skb_parms structure. Also may be used to provide fine
781 * grained control over message transmission.
782 * @sk associated sock of task sending the message.,
783 * @skb contains the sk_buff structure for the netlink message.
784 * Return 0 if the information was successfully saved and message
785 * is allowed to be transmitted.
786 * @netlink_recv:
787 * Check permission before processing the received netlink message in
788 * @skb.
789 * @skb contains the sk_buff structure for the netlink message.
790 * @cap indicates the capability required
791 * Return 0 if permission is granted.
792 *
793 * Security hooks for Unix domain networking.
794 *
795 * @unix_stream_connect:
796 * Check permissions before establishing a Unix domain stream connection
797 * between @sock and @other.
798 * @sock contains the sock structure.
799 * @other contains the peer sock structure.
800 * @newsk contains the new sock structure.
801 * Return 0 if permission is granted.
802 * @unix_may_send:
803 * Check permissions before connecting or sending datagrams from @sock to
804 * @other.
805 * @sock contains the socket structure.
806 * @sock contains the peer socket structure.
807 * Return 0 if permission is granted.
808 *
809 * The @unix_stream_connect and @unix_may_send hooks were necessary because
810 * Linux provides an alternative to the conventional file name space for Unix
811 * domain sockets. Whereas binding and connecting to sockets in the file name
812 * space is mediated by the typical file permissions (and caught by the mknod
813 * and permission hooks in inode_security_ops), binding and connecting to
814 * sockets in the abstract name space is completely unmediated. Sufficient
815 * control of Unix domain sockets in the abstract name space isn't possible
816 * using only the socket layer hooks, since we need to know the actual target
817 * socket, which is not looked up until we are inside the af_unix code.
818 *
819 * Security hooks for socket operations.
820 *
821 * @socket_create:
822 * Check permissions prior to creating a new socket.
823 * @family contains the requested protocol family.
824 * @type contains the requested communications type.
825 * @protocol contains the requested protocol.
826 * @kern set to 1 if a kernel socket.
827 * Return 0 if permission is granted.
828 * @socket_post_create:
829 * This hook allows a module to update or allocate a per-socket security
830 * structure. Note that the security field was not added directly to the
831 * socket structure, but rather, the socket security information is stored
832 * in the associated inode. Typically, the inode alloc_security hook will
833 * allocate and and attach security information to
834 * sock->inode->i_security. This hook may be used to update the
835 * sock->inode->i_security field with additional information that wasn't
836 * available when the inode was allocated.
837 * @sock contains the newly created socket structure.
838 * @family contains the requested protocol family.
839 * @type contains the requested communications type.
840 * @protocol contains the requested protocol.
841 * @kern set to 1 if a kernel socket.
842 * @socket_bind:
843 * Check permission before socket protocol layer bind operation is
844 * performed and the socket @sock is bound to the address specified in the
845 * @address parameter.
846 * @sock contains the socket structure.
847 * @address contains the address to bind to.
848 * @addrlen contains the length of address.
849 * Return 0 if permission is granted.
850 * @socket_connect:
851 * Check permission before socket protocol layer connect operation
852 * attempts to connect socket @sock to a remote address, @address.
853 * @sock contains the socket structure.
854 * @address contains the address of remote endpoint.
855 * @addrlen contains the length of address.
856 * Return 0 if permission is granted.
857 * @socket_listen:
858 * Check permission before socket protocol layer listen operation.
859 * @sock contains the socket structure.
860 * @backlog contains the maximum length for the pending connection queue.
861 * Return 0 if permission is granted.
862 * @socket_accept:
863 * Check permission before accepting a new connection. Note that the new
864 * socket, @newsock, has been created and some information copied to it,
865 * but the accept operation has not actually been performed.
866 * @sock contains the listening socket structure.
867 * @newsock contains the newly created server socket for connection.
868 * Return 0 if permission is granted.
869 * @socket_sendmsg:
870 * Check permission before transmitting a message to another socket.
871 * @sock contains the socket structure.
872 * @msg contains the message to be transmitted.
873 * @size contains the size of message.
874 * Return 0 if permission is granted.
875 * @socket_recvmsg:
876 * Check permission before receiving a message from a socket.
877 * @sock contains the socket structure.
878 * @msg contains the message structure.
879 * @size contains the size of message structure.
880 * @flags contains the operational flags.
881 * Return 0 if permission is granted.
882 * @socket_getsockname:
883 * Check permission before the local address (name) of the socket object
884 * @sock is retrieved.
885 * @sock contains the socket structure.
886 * Return 0 if permission is granted.
887 * @socket_getpeername:
888 * Check permission before the remote address (name) of a socket object
889 * @sock is retrieved.
890 * @sock contains the socket structure.
891 * Return 0 if permission is granted.
892 * @socket_getsockopt:
893 * Check permissions before retrieving the options associated with socket
894 * @sock.
895 * @sock contains the socket structure.
896 * @level contains the protocol level to retrieve option from.
897 * @optname contains the name of option to retrieve.
898 * Return 0 if permission is granted.
899 * @socket_setsockopt:
900 * Check permissions before setting the options associated with socket
901 * @sock.
902 * @sock contains the socket structure.
903 * @level contains the protocol level to set options for.
904 * @optname contains the name of the option to set.
905 * Return 0 if permission is granted.
906 * @socket_shutdown:
907 * Checks permission before all or part of a connection on the socket
908 * @sock is shut down.
909 * @sock contains the socket structure.
910 * @how contains the flag indicating how future sends and receives are handled.
911 * Return 0 if permission is granted.
912 * @socket_sock_rcv_skb:
913 * Check permissions on incoming network packets. This hook is distinct
914 * from Netfilter's IP input hooks since it is the first time that the
915 * incoming sk_buff @skb has been associated with a particular socket, @sk.
916 * Must not sleep inside this hook because some callers hold spinlocks.
917 * @sk contains the sock (not socket) associated with the incoming sk_buff.
918 * @skb contains the incoming network data.
919 * @socket_getpeersec_stream:
920 * This hook allows the security module to provide peer socket security
921 * state for unix or connected tcp sockets to userspace via getsockopt
922 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
923 * socket is associated with an ipsec SA.
924 * @sock is the local socket.
925 * @optval userspace memory where the security state is to be copied.
926 * @optlen userspace int where the module should copy the actual length
927 * of the security state.
928 * @len as input is the maximum length to copy to userspace provided
929 * by the caller.
930 * Return 0 if all is well, otherwise, typical getsockopt return
931 * values.
932 * @socket_getpeersec_dgram:
933 * This hook allows the security module to provide peer socket security
934 * state for udp sockets on a per-packet basis to userspace via
935 * getsockopt SO_GETPEERSEC. The application must first have indicated
936 * the IP_PASSSEC option via getsockopt. It can then retrieve the
937 * security state returned by this hook for a packet via the SCM_SECURITY
938 * ancillary message type.
939 * @skb is the skbuff for the packet being queried
940 * @secdata is a pointer to a buffer in which to copy the security data
941 * @seclen is the maximum length for @secdata
942 * Return 0 on success, error on failure.
943 * @sk_alloc_security:
944 * Allocate and attach a security structure to the sk->sk_security field,
945 * which is used to copy security attributes between local stream sockets.
946 * @sk_free_security:
947 * Deallocate security structure.
948 * @sk_clone_security:
949 * Clone/copy security structure.
950 * @sk_getsecid:
951 * Retrieve the LSM-specific secid for the sock to enable caching of network
952 * authorizations.
953 * @sock_graft:
954 * Sets the socket's isec sid to the sock's sid.
955 * @inet_conn_request:
956 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
957 * @inet_csk_clone:
958 * Sets the new child socket's sid to the openreq sid.
959 * @inet_conn_established:
960 * Sets the connection's peersid to the secmark on skb.
961 * @secmark_relabel_packet:
962 * check if the process should be allowed to relabel packets to the given secid
963 * @security_secmark_refcount_inc
964 * tells the LSM to increment the number of secmark labeling rules loaded
965 * @security_secmark_refcount_dec
966 * tells the LSM to decrement the number of secmark labeling rules loaded
967 * @req_classify_flow:
968 * Sets the flow's sid to the openreq sid.
969 * @tun_dev_create:
970 * Check permissions prior to creating a new TUN device.
971 * @tun_dev_post_create:
972 * This hook allows a module to update or allocate a per-socket security
973 * structure.
974 * @sk contains the newly created sock structure.
975 * @tun_dev_attach:
976 * Check permissions prior to attaching to a persistent TUN device. This
977 * hook can also be used by the module to update any security state
978 * associated with the TUN device's sock structure.
979 * @sk contains the existing sock structure.
980 *
981 * Security hooks for XFRM operations.
982 *
983 * @xfrm_policy_alloc_security:
984 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
985 * Database used by the XFRM system.
986 * @sec_ctx contains the security context information being provided by
987 * the user-level policy update program (e.g., setkey).
988 * Allocate a security structure to the xp->security field; the security
989 * field is initialized to NULL when the xfrm_policy is allocated.
990 * Return 0 if operation was successful (memory to allocate, legal context)
991 * @xfrm_policy_clone_security:
992 * @old_ctx contains an existing xfrm_sec_ctx.
993 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
994 * Allocate a security structure in new_ctxp that contains the
995 * information from the old_ctx structure.
996 * Return 0 if operation was successful (memory to allocate).
997 * @xfrm_policy_free_security:
998 * @ctx contains the xfrm_sec_ctx
999 * Deallocate xp->security.
1000 * @xfrm_policy_delete_security:
1001 * @ctx contains the xfrm_sec_ctx.
1002 * Authorize deletion of xp->security.
1003 * @xfrm_state_alloc_security:
1004 * @x contains the xfrm_state being added to the Security Association
1005 * Database by the XFRM system.
1006 * @sec_ctx contains the security context information being provided by
1007 * the user-level SA generation program (e.g., setkey or racoon).
1008 * @secid contains the secid from which to take the mls portion of the context.
1009 * Allocate a security structure to the x->security field; the security
1010 * field is initialized to NULL when the xfrm_state is allocated. Set the
1011 * context to correspond to either sec_ctx or polsec, with the mls portion
1012 * taken from secid in the latter case.
1013 * Return 0 if operation was successful (memory to allocate, legal context).
1014 * @xfrm_state_free_security:
1015 * @x contains the xfrm_state.
1016 * Deallocate x->security.
1017 * @xfrm_state_delete_security:
1018 * @x contains the xfrm_state.
1019 * Authorize deletion of x->security.
1020 * @xfrm_policy_lookup:
1021 * @ctx contains the xfrm_sec_ctx for which the access control is being
1022 * checked.
1023 * @fl_secid contains the flow security label that is used to authorize
1024 * access to the policy xp.
1025 * @dir contains the direction of the flow (input or output).
1026 * Check permission when a flow selects a xfrm_policy for processing
1027 * XFRMs on a packet. The hook is called when selecting either a
1028 * per-socket policy or a generic xfrm policy.
1029 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1030 * on other errors.
1031 * @xfrm_state_pol_flow_match:
1032 * @x contains the state to match.
1033 * @xp contains the policy to check for a match.
1034 * @fl contains the flow to check for a match.
1035 * Return 1 if there is a match.
1036 * @xfrm_decode_session:
1037 * @skb points to skb to decode.
1038 * @secid points to the flow key secid to set.
1039 * @ckall says if all xfrms used should be checked for same secid.
1040 * Return 0 if ckall is zero or all xfrms used have the same secid.
1041 *
1042 * Security hooks affecting all Key Management operations
1043 *
1044 * @key_alloc:
1045 * Permit allocation of a key and assign security data. Note that key does
1046 * not have a serial number assigned at this point.
1047 * @key points to the key.
1048 * @flags is the allocation flags
1049 * Return 0 if permission is granted, -ve error otherwise.
1050 * @key_free:
1051 * Notification of destruction; free security data.
1052 * @key points to the key.
1053 * No return value.
1054 * @key_permission:
1055 * See whether a specific operational right is granted to a process on a
1056 * key.
1057 * @key_ref refers to the key (key pointer + possession attribute bit).
1058 * @cred points to the credentials to provide the context against which to
1059 * evaluate the security data on the key.
1060 * @perm describes the combination of permissions required of this key.
1061 * Return 0 if permission is granted, -ve error otherwise.
1062 * @key_getsecurity:
1063 * Get a textual representation of the security context attached to a key
1064 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1065 * allocates the storage for the NUL-terminated string and the caller
1066 * should free it.
1067 * @key points to the key to be queried.
1068 * @_buffer points to a pointer that should be set to point to the
1069 * resulting string (if no label or an error occurs).
1070 * Return the length of the string (including terminating NUL) or -ve if
1071 * an error.
1072 * May also return 0 (and a NULL buffer pointer) if there is no label.
1073 *
1074 * Security hooks affecting all System V IPC operations.
1075 *
1076 * @ipc_permission:
1077 * Check permissions for access to IPC
1078 * @ipcp contains the kernel IPC permission structure
1079 * @flag contains the desired (requested) permission set
1080 * Return 0 if permission is granted.
1081 * @ipc_getsecid:
1082 * Get the secid associated with the ipc object.
1083 * @ipcp contains the kernel IPC permission structure.
1084 * @secid contains a pointer to the location where result will be saved.
1085 * In case of failure, @secid will be set to zero.
1086 *
1087 * Security hooks for individual messages held in System V IPC message queues
1088 * @msg_msg_alloc_security:
1089 * Allocate and attach a security structure to the msg->security field.
1090 * The security field is initialized to NULL when the structure is first
1091 * created.
1092 * @msg contains the message structure to be modified.
1093 * Return 0 if operation was successful and permission is granted.
1094 * @msg_msg_free_security:
1095 * Deallocate the security structure for this message.
1096 * @msg contains the message structure to be modified.
1097 *
1098 * Security hooks for System V IPC Message Queues
1099 *
1100 * @msg_queue_alloc_security:
1101 * Allocate and attach a security structure to the
1102 * msq->q_perm.security field. The security field is initialized to
1103 * NULL when the structure is first created.
1104 * @msq contains the message queue structure to be modified.
1105 * Return 0 if operation was successful and permission is granted.
1106 * @msg_queue_free_security:
1107 * Deallocate security structure for this message queue.
1108 * @msq contains the message queue structure to be modified.
1109 * @msg_queue_associate:
1110 * Check permission when a message queue is requested through the
1111 * msgget system call. This hook is only called when returning the
1112 * message queue identifier for an existing message queue, not when a
1113 * new message queue is created.
1114 * @msq contains the message queue to act upon.
1115 * @msqflg contains the operation control flags.
1116 * Return 0 if permission is granted.
1117 * @msg_queue_msgctl:
1118 * Check permission when a message control operation specified by @cmd
1119 * is to be performed on the message queue @msq.
1120 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1121 * @msq contains the message queue to act upon. May be NULL.
1122 * @cmd contains the operation to be performed.
1123 * Return 0 if permission is granted.
1124 * @msg_queue_msgsnd:
1125 * Check permission before a message, @msg, is enqueued on the message
1126 * queue, @msq.
1127 * @msq contains the message queue to send message to.
1128 * @msg contains the message to be enqueued.
1129 * @msqflg contains operational flags.
1130 * Return 0 if permission is granted.
1131 * @msg_queue_msgrcv:
1132 * Check permission before a message, @msg, is removed from the message
1133 * queue, @msq. The @target task structure contains a pointer to the
1134 * process that will be receiving the message (not equal to the current
1135 * process when inline receives are being performed).
1136 * @msq contains the message queue to retrieve message from.
1137 * @msg contains the message destination.
1138 * @target contains the task structure for recipient process.
1139 * @type contains the type of message requested.
1140 * @mode contains the operational flags.
1141 * Return 0 if permission is granted.
1142 *
1143 * Security hooks for System V Shared Memory Segments
1144 *
1145 * @shm_alloc_security:
1146 * Allocate and attach a security structure to the shp->shm_perm.security
1147 * field. The security field is initialized to NULL when the structure is
1148 * first created.
1149 * @shp contains the shared memory structure to be modified.
1150 * Return 0 if operation was successful and permission is granted.
1151 * @shm_free_security:
1152 * Deallocate the security struct for this memory segment.
1153 * @shp contains the shared memory structure to be modified.
1154 * @shm_associate:
1155 * Check permission when a shared memory region is requested through the
1156 * shmget system call. This hook is only called when returning the shared
1157 * memory region identifier for an existing region, not when a new shared
1158 * memory region is created.
1159 * @shp contains the shared memory structure to be modified.
1160 * @shmflg contains the operation control flags.
1161 * Return 0 if permission is granted.
1162 * @shm_shmctl:
1163 * Check permission when a shared memory control operation specified by
1164 * @cmd is to be performed on the shared memory region @shp.
1165 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1166 * @shp contains shared memory structure to be modified.
1167 * @cmd contains the operation to be performed.
1168 * Return 0 if permission is granted.
1169 * @shm_shmat:
1170 * Check permissions prior to allowing the shmat system call to attach the
1171 * shared memory segment @shp to the data segment of the calling process.
1172 * The attaching address is specified by @shmaddr.
1173 * @shp contains the shared memory structure to be modified.
1174 * @shmaddr contains the address to attach memory region to.
1175 * @shmflg contains the operational flags.
1176 * Return 0 if permission is granted.
1177 *
1178 * Security hooks for System V Semaphores
1179 *
1180 * @sem_alloc_security:
1181 * Allocate and attach a security structure to the sma->sem_perm.security
1182 * field. The security field is initialized to NULL when the structure is
1183 * first created.
1184 * @sma contains the semaphore structure
1185 * Return 0 if operation was successful and permission is granted.
1186 * @sem_free_security:
1187 * deallocate security struct for this semaphore
1188 * @sma contains the semaphore structure.
1189 * @sem_associate:
1190 * Check permission when a semaphore is requested through the semget
1191 * system call. This hook is only called when returning the semaphore
1192 * identifier for an existing semaphore, not when a new one must be
1193 * created.
1194 * @sma contains the semaphore structure.
1195 * @semflg contains the operation control flags.
1196 * Return 0 if permission is granted.
1197 * @sem_semctl:
1198 * Check permission when a semaphore operation specified by @cmd is to be
1199 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1200 * IPC_INFO or SEM_INFO.
1201 * @sma contains the semaphore structure. May be NULL.
1202 * @cmd contains the operation to be performed.
1203 * Return 0 if permission is granted.
1204 * @sem_semop
1205 * Check permissions before performing operations on members of the
1206 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1207 * may be modified.
1208 * @sma contains the semaphore structure.
1209 * @sops contains the operations to perform.
1210 * @nsops contains the number of operations to perform.
1211 * @alter contains the flag indicating whether changes are to be made.
1212 * Return 0 if permission is granted.
1213 *
1214 * @ptrace_access_check:
1215 * Check permission before allowing the current process to trace the
1216 * @child process.
1217 * Security modules may also want to perform a process tracing check
1218 * during an execve in the set_security or apply_creds hooks of
1219 * tracing check during an execve in the bprm_set_creds hook of
1220 * binprm_security_ops if the process is being traced and its security
1221 * attributes would be changed by the execve.
1222 * @child contains the task_struct structure for the target process.
1223 * @mode contains the PTRACE_MODE flags indicating the form of access.
1224 * Return 0 if permission is granted.
1225 * @ptrace_traceme:
1226 * Check that the @parent process has sufficient permission to trace the
1227 * current process before allowing the current process to present itself
1228 * to the @parent process for tracing.
1229 * The parent process will still have to undergo the ptrace_access_check
1230 * checks before it is allowed to trace this one.
1231 * @parent contains the task_struct structure for debugger process.
1232 * Return 0 if permission is granted.
1233 * @capget:
1234 * Get the @effective, @inheritable, and @permitted capability sets for
1235 * the @target process. The hook may also perform permission checking to
1236 * determine if the current process is allowed to see the capability sets
1237 * of the @target process.
1238 * @target contains the task_struct structure for target process.
1239 * @effective contains the effective capability set.
1240 * @inheritable contains the inheritable capability set.
1241 * @permitted contains the permitted capability set.
1242 * Return 0 if the capability sets were successfully obtained.
1243 * @capset:
1244 * Set the @effective, @inheritable, and @permitted capability sets for
1245 * the current process.
1246 * @new contains the new credentials structure for target process.
1247 * @old contains the current credentials structure for target process.
1248 * @effective contains the effective capability set.
1249 * @inheritable contains the inheritable capability set.
1250 * @permitted contains the permitted capability set.
1251 * Return 0 and update @new if permission is granted.
1252 * @capable:
1253 * Check whether the @tsk process has the @cap capability in the indicated
1254 * credentials.
1255 * @tsk contains the task_struct for the process.
1256 * @cred contains the credentials to use.
1257 * @cap contains the capability <include/linux/capability.h>.
1258 * @audit: Whether to write an audit message or not
1259 * Return 0 if the capability is granted for @tsk.
1260 * @sysctl:
1261 * Check permission before accessing the @table sysctl variable in the
1262 * manner specified by @op.
1263 * @table contains the ctl_table structure for the sysctl variable.
1264 * @op contains the operation (001 = search, 002 = write, 004 = read).
1265 * Return 0 if permission is granted.
1266 * @syslog:
1267 * Check permission before accessing the kernel message ring or changing
1268 * logging to the console.
1269 * See the syslog(2) manual page for an explanation of the @type values.
1270 * @type contains the type of action.
1271 * @from_file indicates the context of action (if it came from /proc).
1272 * Return 0 if permission is granted.
1273 * @settime:
1274 * Check permission to change the system time.
1275 * struct timespec and timezone are defined in include/linux/time.h
1276 * @ts contains new time
1277 * @tz contains new timezone
1278 * Return 0 if permission is granted.
1279 * @vm_enough_memory:
1280 * Check permissions for allocating a new virtual mapping.
1281 * @mm contains the mm struct it is being added to.
1282 * @pages contains the number of pages.
1283 * Return 0 if permission is granted.
1284 *
1285 * @secid_to_secctx:
1286 * Convert secid to security context. If secdata is NULL the length of
1287 * the result will be returned in seclen, but no secdata will be returned.
1288 * This does mean that the length could change between calls to check the
1289 * length and the next call which actually allocates and returns the secdata.
1290 * @secid contains the security ID.
1291 * @secdata contains the pointer that stores the converted security context.
1292 * @seclen pointer which contains the length of the data
1293 * @secctx_to_secid:
1294 * Convert security context to secid.
1295 * @secid contains the pointer to the generated security ID.
1296 * @secdata contains the security context.
1297 *
1298 * @release_secctx:
1299 * Release the security context.
1300 * @secdata contains the security context.
1301 * @seclen contains the length of the security context.
1302 *
1303 * Security hooks for Audit
1304 *
1305 * @audit_rule_init:
1306 * Allocate and initialize an LSM audit rule structure.
1307 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1308 * @op contains the operator the rule uses.
1309 * @rulestr contains the context where the rule will be applied to.
1310 * @lsmrule contains a pointer to receive the result.
1311 * Return 0 if @lsmrule has been successfully set,
1312 * -EINVAL in case of an invalid rule.
1313 *
1314 * @audit_rule_known:
1315 * Specifies whether given @rule contains any fields related to current LSM.
1316 * @rule contains the audit rule of interest.
1317 * Return 1 in case of relation found, 0 otherwise.
1318 *
1319 * @audit_rule_match:
1320 * Determine if given @secid matches a rule previously approved
1321 * by @audit_rule_known.
1322 * @secid contains the security id in question.
1323 * @field contains the field which relates to current LSM.
1324 * @op contains the operator that will be used for matching.
1325 * @rule points to the audit rule that will be checked against.
1326 * @actx points to the audit context associated with the check.
1327 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1328 *
1329 * @audit_rule_free:
1330 * Deallocate the LSM audit rule structure previously allocated by
1331 * audit_rule_init.
1332 * @rule contains the allocated rule
1333 *
1334 * @inode_notifysecctx:
1335 * Notify the security module of what the security context of an inode
1336 * should be. Initializes the incore security context managed by the
1337 * security module for this inode. Example usage: NFS client invokes
1338 * this hook to initialize the security context in its incore inode to the
1339 * value provided by the server for the file when the server returned the
1340 * file's attributes to the client.
1341 *
1342 * Must be called with inode->i_mutex locked.
1343 *
1344 * @inode we wish to set the security context of.
1345 * @ctx contains the string which we wish to set in the inode.
1346 * @ctxlen contains the length of @ctx.
1347 *
1348 * @inode_setsecctx:
1349 * Change the security context of an inode. Updates the
1350 * incore security context managed by the security module and invokes the
1351 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1352 * xattrs that represent the context. Example usage: NFS server invokes
1353 * this hook to change the security context in its incore inode and on the
1354 * backing filesystem to a value provided by the client on a SETATTR
1355 * operation.
1356 *
1357 * Must be called with inode->i_mutex locked.
1358 *
1359 * @dentry contains the inode we wish to set the security context of.
1360 * @ctx contains the string which we wish to set in the inode.
1361 * @ctxlen contains the length of @ctx.
1362 *
1363 * @inode_getsecctx:
1364 * Returns a string containing all relavent security context information
1365 *
1366 * @inode we wish to set the security context of.
1367 * @ctx is a pointer in which to place the allocated security context.
1368 * @ctxlen points to the place to put the length of @ctx.
1369 * This is the main security structure.
1370 */
1416 #ifdef CONFIG_SECURITY_PATH
1430 mode_t mode);
1433 #endif
1466 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1467 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1496 gfp_t gfp);
1569 #ifdef CONFIG_SECURITY_NETWORK
1592 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1612 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1615 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1620 u32 secid);
1630 /* key management security hooks */
1631 #ifdef CONFIG_KEYS
1636 key_perm_t perm);
1640 #ifdef CONFIG_AUDIT
1647 };
1649 /* prototypes */
1654 /* Security operations */
1726 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1727 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1811 };
1814 {
1815 }
1818 {
1819 }
1821 /*
1822 * This is the default capabilities functionality. Most of these functions
1823 * are just stubbed out, but a few must call the proper capable code.
1824 */
1827 {
1829 }
1833 {
1835 }
1838 {
1840 }
1846 {
1848 }
1855 {
1857 }
1860 {
1862 }
1865 {
1872 }
1876 {
1881 SECURITY_CAP_NOAUDIT);
1884 }
1887 {
1889 }
1893 {
1895 }
1898 {
1900 }
1903 {
1905 }
1908 {
1910 }
1913 {
1916 }
1919 {
1922 }
1925 {
1926 /* If current->mm is a kernel thread then we will pass NULL,
1927 for this specific case that is fine */
1929 }
1932 {
1934 }
1937 {
1939 }
1942 {
1943 }
1946 {
1947 }
1950 {
1952 }
1955 {
1957 }
1960 { }
1963 {
1965 }
1968 {
1970 }
1974 {
1976 }
1979 {
1981 }
1986 {
1988 }
1991 {
1993 }
1997 {
1999 }
2003 {
2005 }
2009 { }
2012 {
2014 }
2017 {
2019 }
2022 { }
2029 {
2031 }
2036 {
2038 }
2043 {
2045 }
2049 {
2051 }
2056 {
2058 }
2063 {
2065 }
2069 {
2071 }
2076 {
2078 }
2084 {
2086 }
2089 {
2091 }
2095 {
2097 }
2100 {
2102 }
2106 {
2108 }
2112 {
2114 }
2118 {
2120 }
2124 {
2126 }
2130 { }
2134 {
2136 }
2139 {
2141 }
2145 {
2147 }
2150 {
2152 }
2155 {
2157 }
2159 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2160 {
2162 }
2164 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2165 {
2167 }
2169 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2170 {
2172 }
2175 {
2177 }
2180 {
2182 }
2185 {
2187 }
2190 { }
2194 {
2196 }
2203 {
2205 }
2210 {
2212 }
2215 {
2217 }
2221 {
2223 }
2226 {
2228 }
2233 {
2235 }
2238 {
2240 }
2244 {
2246 }
2249 {
2251 }
2254 {
2256 }
2259 { }
2263 gfp_t gfp)
2264 {
2266 }
2270 {
2271 }
2274 {
2276 }
2280 {
2282 }
2285 {
2287 }
2292 {
2294 }
2297 {
2299 }
2302 {
2304 }
2307 {
2309 }
2312 {
2314 }
2317 {
2319 }
2322 {
2324 }
2327 {
2329 }
2334 {
2336 }
2339 {
2341 }
2344 {
2346 }
2349 {
2351 }
2355 u32 secid)
2356 {
2358 }
2361 {
2363 }
2369 {
2371 }
2374 { }
2378 {
2380 }
2383 {
2385 }
2388 {
2390 }
2393 { }
2396 {
2398 }
2401 { }
2405 {
2407 }
2410 {
2412 }
2416 {
2418 }
2424 {
2426 }
2429 {
2431 }
2434 { }
2438 {
2440 }
2443 {
2445 }
2449 {
2451 }
2454 {
2456 }
2459 { }
2462 {
2464 }
2467 {
2469 }
2474 {
2476 }
2479 { }
2482 {
2484 }
2486 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2487 {
2489 }
2492 {
2494 }
2497 {
2499 }
2502 {
2504 }
2507 u32 seclen,
2509 {
2511 }
2514 {
2515 }
2518 {
2520 }
2522 {
2524 }
2526 {
2528 }
2531 #ifdef CONFIG_SECURITY_NETWORK
2577 {
2579 }
2583 {
2585 }
2589 {
2591 }
2597 {
2599 }
2604 {
2606 }
2611 {
2613 }
2616 {
2618 }
2622 {
2624 }
2628 {
2630 }
2635 {
2637 }
2640 {
2642 }
2645 {
2647 }
2651 {
2653 }
2657 {
2659 }
2662 {
2664 }
2667 {
2669 }
2673 {
2675 }
2677 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2678 {
2680 }
2683 {
2685 }
2688 {
2689 }
2692 {
2693 }
2696 {
2697 }
2699 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2700 {
2701 }
2704 {
2705 }
2709 {
2711 }
2715 {
2716 }
2720 {
2721 }
2724 {
2726 }
2729 {
2730 }
2733 {
2734 }
2737 {
2739 }
2742 {
2743 }
2746 {
2748 }
2751 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2770 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2771 {
2773 }
2775 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2776 {
2778 }
2781 {
2782 }
2785 {
2787 }
2791 {
2793 }
2797 {
2799 }
2802 {
2803 }
2806 {
2808 }
2811 {
2813 }
2817 {
2819 }
2822 {
2824 }
2827 {
2828 }
2832 #ifdef CONFIG_SECURITY_PATH
2846 mode_t mode);
2851 {
2853 }
2857 {
2859 }
2862 {
2864 }
2868 {
2870 }
2873 {
2875 }
2879 {
2881 }
2886 {
2888 }
2894 {
2896 }
2900 mode_t mode)
2901 {
2903 }
2906 {
2908 }
2911 {
2913 }
2916 #ifdef CONFIG_KEYS
2917 #ifdef CONFIG_SECURITY
2925 #else
2930 {
2932 }
2935 {
2936 }
2940 key_perm_t perm)
2941 {
2943 }
2946 {
2949 }
2951 #endif
2954 #ifdef CONFIG_AUDIT
2955 #ifdef CONFIG_SECURITY
2962 #else
2966 {
2968 }
2971 {
2973 }
2977 {
2979 }
2982 { }
2987 #ifdef CONFIG_SECURITYFS
2999 {
3001 }
3004 mode_t mode,
3008 {
3010 }
3013 {}
3015 #endif
3017 #ifdef CONFIG_SECURITY
3020 {
3022 }
3025 {
3027 }
3029 #else
3032 {
3034 }
3037 { }