| blob | fd4d55fb884539fa0954937b0bbf5945e8bd5a6b |
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 * @nd contains the nameidata (may be NULL).
461 * Return 0 if permission is granted.
462 * @inode_setattr:
463 * Check permission before setting file attributes. Note that the kernel
464 * call to notify_change is performed from several locations, whenever
465 * file attributes change (such as when a file is truncated, chown/chmod
466 * operations, transferring disk quotas, etc).
467 * @dentry contains the dentry structure for the file.
468 * @attr is the iattr structure containing the new file attributes.
469 * Return 0 if permission is granted.
470 * @path_truncate:
471 * Check permission before truncating a file.
472 * @path contains the path structure for the file.
473 * Return 0 if permission is granted.
474 * @inode_getattr:
475 * Check permission before obtaining file attributes.
476 * @mnt is the vfsmount where the dentry was looked up
477 * @dentry contains the dentry structure for the file.
478 * Return 0 if permission is granted.
479 * @inode_setxattr:
480 * Check permission before setting the extended attributes
481 * @value identified by @name for @dentry.
482 * Return 0 if permission is granted.
483 * @inode_post_setxattr:
484 * Update inode security field after successful setxattr operation.
485 * @value identified by @name for @dentry.
486 * @inode_getxattr:
487 * Check permission before obtaining the extended attributes
488 * identified by @name for @dentry.
489 * Return 0 if permission is granted.
490 * @inode_listxattr:
491 * Check permission before obtaining the list of extended attribute
492 * names for @dentry.
493 * Return 0 if permission is granted.
494 * @inode_removexattr:
495 * Check permission before removing the extended attribute
496 * identified by @name for @dentry.
497 * Return 0 if permission is granted.
498 * @inode_getsecurity:
499 * Retrieve a copy of the extended attribute representation of the
500 * security label associated with @name for @inode via @buffer. Note that
501 * @name is the remainder of the attribute name after the security prefix
502 * has been removed. @alloc is used to specify of the call should return a
503 * value via the buffer or just the value length Return size of buffer on
504 * success.
505 * @inode_setsecurity:
506 * Set the security label associated with @name for @inode from the
507 * extended attribute value @value. @size indicates the size of the
508 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
509 * Note that @name is the remainder of the attribute name after the
510 * security. prefix has been removed.
511 * Return 0 on success.
512 * @inode_listsecurity:
513 * Copy the extended attribute names for the security labels
514 * associated with @inode into @buffer. The maximum size of @buffer
515 * is specified by @buffer_size. @buffer may be NULL to request
516 * the size of the buffer required.
517 * Returns number of bytes used/required on success.
518 * @inode_need_killpriv:
519 * Called when an inode has been changed.
520 * @dentry is the dentry being changed.
521 * Return <0 on error to abort the inode change operation.
522 * Return 0 if inode_killpriv does not need to be called.
523 * Return >0 if inode_killpriv does need to be called.
524 * @inode_killpriv:
525 * The setuid bit is being removed. Remove similar security labels.
526 * Called with the dentry->d_inode->i_mutex held.
527 * @dentry is the dentry being changed.
528 * Return 0 on success. If error is returned, then the operation
529 * causing setuid bit removal is failed.
530 * @inode_getsecid:
531 * Get the secid associated with the node.
532 * @inode contains a pointer to the inode.
533 * @secid contains a pointer to the location where result will be saved.
534 * In case of failure, @secid will be set to zero.
535 *
536 * Security hooks for file operations
537 *
538 * @file_permission:
539 * Check file permissions before accessing an open file. This hook is
540 * called by various operations that read or write files. A security
541 * module can use this hook to perform additional checking on these
542 * operations, e.g. to revalidate permissions on use to support privilege
543 * bracketing or policy changes. Notice that this hook is used when the
544 * actual read/write operations are performed, whereas the
545 * inode_security_ops hook is called when a file is opened (as well as
546 * many other operations).
547 * Caveat: Although this hook can be used to revalidate permissions for
548 * various system call operations that read or write files, it does not
549 * address the revalidation of permissions for memory-mapped files.
550 * Security modules must handle this separately if they need such
551 * revalidation.
552 * @file contains the file structure being accessed.
553 * @mask contains the requested permissions.
554 * Return 0 if permission is granted.
555 * @file_alloc_security:
556 * Allocate and attach a security structure to the file->f_security field.
557 * The security field is initialized to NULL when the structure is first
558 * created.
559 * @file contains the file structure to secure.
560 * Return 0 if the hook is successful and permission is granted.
561 * @file_free_security:
562 * Deallocate and free any security structures stored in file->f_security.
563 * @file contains the file structure being modified.
564 * @file_ioctl:
565 * @file contains the file structure.
566 * @cmd contains the operation to perform.
567 * @arg contains the operational arguments.
568 * Check permission for an ioctl operation on @file. Note that @arg can
569 * sometimes represents a user space pointer; in other cases, it may be a
570 * simple integer value. When @arg represents a user space pointer, it
571 * should never be used by the security module.
572 * Return 0 if permission is granted.
573 * @file_mmap :
574 * Check permissions for a mmap operation. The @file may be NULL, e.g.
575 * if mapping anonymous memory.
576 * @file contains the file structure for file to map (may be NULL).
577 * @reqprot contains the protection requested by the application.
578 * @prot contains the protection that will be applied by the kernel.
579 * @flags contains the operational flags.
580 * Return 0 if permission is granted.
581 * @file_mprotect:
582 * Check permissions before changing memory access permissions.
583 * @vma contains the memory region to modify.
584 * @reqprot contains the protection requested by the application.
585 * @prot contains the protection that will be applied by the kernel.
586 * Return 0 if permission is granted.
587 * @file_lock:
588 * Check permission before performing file locking operations.
589 * Note: this hook mediates both flock and fcntl style locks.
590 * @file contains the file structure.
591 * @cmd contains the posix-translated lock operation to perform
592 * (e.g. F_RDLCK, F_WRLCK).
593 * Return 0 if permission is granted.
594 * @file_fcntl:
595 * Check permission before allowing the file operation specified by @cmd
596 * from being performed on the file @file. Note that @arg can sometimes
597 * represents a user space pointer; in other cases, it may be a simple
598 * integer value. When @arg represents a user space pointer, it should
599 * never be used by the security module.
600 * @file contains the file structure.
601 * @cmd contains the operation to be performed.
602 * @arg contains the operational arguments.
603 * Return 0 if permission is granted.
604 * @file_set_fowner:
605 * Save owner security information (typically from current->security) in
606 * file->f_security for later use by the send_sigiotask hook.
607 * @file contains the file structure to update.
608 * Return 0 on success.
609 * @file_send_sigiotask:
610 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
611 * process @tsk. Note that this hook is sometimes called from interrupt.
612 * Note that the fown_struct, @fown, is never outside the context of a
613 * struct file, so the file structure (and associated security information)
614 * can always be obtained:
615 * container_of(fown, struct file, f_owner)
616 * @tsk contains the structure of task receiving signal.
617 * @fown contains the file owner information.
618 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
619 * Return 0 if permission is granted.
620 * @file_receive:
621 * This hook allows security modules to control the ability of a process
622 * to receive an open file descriptor via socket IPC.
623 * @file contains the file structure being received.
624 * Return 0 if permission is granted.
625 *
626 * Security hook for dentry
627 *
628 * @dentry_open
629 * Save open-time permission checking state for later use upon
630 * file_permission, and recheck access if anything has changed
631 * since inode_permission.
632 *
633 * Security hooks for task operations.
634 *
635 * @task_create:
636 * Check permission before creating a child process. See the clone(2)
637 * manual page for definitions of the @clone_flags.
638 * @clone_flags contains the flags indicating what should be shared.
639 * Return 0 if permission is granted.
640 * @cred_alloc_blank:
641 * @cred points to the credentials.
642 * @gfp indicates the atomicity of any memory allocations.
643 * Only allocate sufficient memory and attach to @cred such that
644 * cred_transfer() will not get ENOMEM.
645 * @cred_free:
646 * @cred points to the credentials.
647 * Deallocate and clear the cred->security field in a set of credentials.
648 * @cred_prepare:
649 * @new points to the new credentials.
650 * @old points to the original credentials.
651 * @gfp indicates the atomicity of any memory allocations.
652 * Prepare a new set of credentials by copying the data from the old set.
653 * @cred_transfer:
654 * @new points to the new credentials.
655 * @old points to the original credentials.
656 * Transfer data from original creds to new creds
657 * @kernel_act_as:
658 * Set the credentials for a kernel service to act as (subjective context).
659 * @new points to the credentials to be modified.
660 * @secid specifies the security ID to be set
661 * The current task must be the one that nominated @secid.
662 * Return 0 if successful.
663 * @kernel_create_files_as:
664 * Set the file creation context in a set of credentials to be the same as
665 * the objective context of the specified inode.
666 * @new points to the credentials to be modified.
667 * @inode points to the inode to use as a reference.
668 * The current task must be the one that nominated @inode.
669 * Return 0 if successful.
670 * @kernel_module_request:
671 * Ability to trigger the kernel to automatically upcall to userspace for
672 * userspace to load a kernel module with the given name.
673 * @kmod_name name of the module requested by the kernel
674 * Return 0 if successful.
675 * @task_fix_setuid:
676 * Update the module's state after setting one or more of the user
677 * identity attributes of the current process. The @flags parameter
678 * indicates which of the set*uid system calls invoked this hook. If
679 * @new is the set of credentials that will be installed. Modifications
680 * should be made to this rather than to @current->cred.
681 * @old is the set of credentials that are being replaces
682 * @flags contains one of the LSM_SETID_* values.
683 * Return 0 on success.
684 * @task_setpgid:
685 * Check permission before setting the process group identifier of the
686 * process @p to @pgid.
687 * @p contains the task_struct for process being modified.
688 * @pgid contains the new pgid.
689 * Return 0 if permission is granted.
690 * @task_getpgid:
691 * Check permission before getting the process group identifier of the
692 * process @p.
693 * @p contains the task_struct for the process.
694 * Return 0 if permission is granted.
695 * @task_getsid:
696 * Check permission before getting the session identifier of the process
697 * @p.
698 * @p contains the task_struct for the process.
699 * Return 0 if permission is granted.
700 * @task_getsecid:
701 * Retrieve the security identifier of the process @p.
702 * @p contains the task_struct for the process and place is into @secid.
703 * In case of failure, @secid will be set to zero.
704 *
705 * @task_setnice:
706 * Check permission before setting the nice value of @p to @nice.
707 * @p contains the task_struct of process.
708 * @nice contains the new nice value.
709 * Return 0 if permission is granted.
710 * @task_setioprio
711 * Check permission before setting the ioprio value of @p to @ioprio.
712 * @p contains the task_struct of process.
713 * @ioprio contains the new ioprio value
714 * Return 0 if permission is granted.
715 * @task_getioprio
716 * Check permission before getting the ioprio value of @p.
717 * @p contains the task_struct of process.
718 * Return 0 if permission is granted.
719 * @task_setrlimit:
720 * Check permission before setting the resource limits of the current
721 * process for @resource to @new_rlim. The old resource limit values can
722 * be examined by dereferencing (current->signal->rlim + resource).
723 * @resource contains the resource whose limit is being set.
724 * @new_rlim contains the new limits for @resource.
725 * Return 0 if permission is granted.
726 * @task_setscheduler:
727 * Check permission before setting scheduling policy and/or parameters of
728 * process @p based on @policy and @lp.
729 * @p contains the task_struct for process.
730 * @policy contains the scheduling policy.
731 * @lp contains the scheduling parameters.
732 * Return 0 if permission is granted.
733 * @task_getscheduler:
734 * Check permission before obtaining scheduling information for process
735 * @p.
736 * @p contains the task_struct for process.
737 * Return 0 if permission is granted.
738 * @task_movememory
739 * Check permission before moving memory owned by process @p.
740 * @p contains the task_struct for process.
741 * Return 0 if permission is granted.
742 * @task_kill:
743 * Check permission before sending signal @sig to @p. @info can be NULL,
744 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
745 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
746 * from the kernel and should typically be permitted.
747 * SIGIO signals are handled separately by the send_sigiotask hook in
748 * file_security_ops.
749 * @p contains the task_struct for process.
750 * @info contains the signal information.
751 * @sig contains the signal value.
752 * @secid contains the sid of the process where the signal originated
753 * Return 0 if permission is granted.
754 * @task_wait:
755 * Check permission before allowing a process to reap a child process @p
756 * and collect its status information.
757 * @p contains the task_struct for process.
758 * Return 0 if permission is granted.
759 * @task_prctl:
760 * Check permission before performing a process control operation on the
761 * current process.
762 * @option contains the operation.
763 * @arg2 contains a argument.
764 * @arg3 contains a argument.
765 * @arg4 contains a argument.
766 * @arg5 contains a argument.
767 * Return -ENOSYS if no-one wanted to handle this op, any other value to
768 * cause prctl() to return immediately with that value.
769 * @task_to_inode:
770 * Set the security attributes for an inode based on an associated task's
771 * security attributes, e.g. for /proc/pid inodes.
772 * @p contains the task_struct for the task.
773 * @inode contains the inode structure for the inode.
774 *
775 * Security hooks for Netlink messaging.
776 *
777 * @netlink_send:
778 * Save security information for a netlink message so that permission
779 * checking can be performed when the message is processed. The security
780 * information can be saved using the eff_cap field of the
781 * netlink_skb_parms structure. Also may be used to provide fine
782 * grained control over message transmission.
783 * @sk associated sock of task sending the message.,
784 * @skb contains the sk_buff structure for the netlink message.
785 * Return 0 if the information was successfully saved and message
786 * is allowed to be transmitted.
787 * @netlink_recv:
788 * Check permission before processing the received netlink message in
789 * @skb.
790 * @skb contains the sk_buff structure for the netlink message.
791 * @cap indicates the capability required
792 * Return 0 if permission is granted.
793 *
794 * Security hooks for Unix domain networking.
795 *
796 * @unix_stream_connect:
797 * Check permissions before establishing a Unix domain stream connection
798 * between @sock and @other.
799 * @sock contains the socket structure.
800 * @other contains the peer socket 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 1 if permission granted, 0 if permission denied and -ve it the
1062 * normal permissions model should be effected.
1063 * @key_getsecurity:
1064 * Get a textual representation of the security context attached to a key
1065 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1066 * allocates the storage for the NUL-terminated string and the caller
1067 * should free it.
1068 * @key points to the key to be queried.
1069 * @_buffer points to a pointer that should be set to point to the
1070 * resulting string (if no label or an error occurs).
1071 * Return the length of the string (including terminating NUL) or -ve if
1072 * an error.
1073 * May also return 0 (and a NULL buffer pointer) if there is no label.
1074 *
1075 * Security hooks affecting all System V IPC operations.
1076 *
1077 * @ipc_permission:
1078 * Check permissions for access to IPC
1079 * @ipcp contains the kernel IPC permission structure
1080 * @flag contains the desired (requested) permission set
1081 * Return 0 if permission is granted.
1082 * @ipc_getsecid:
1083 * Get the secid associated with the ipc object.
1084 * @ipcp contains the kernel IPC permission structure.
1085 * @secid contains a pointer to the location where result will be saved.
1086 * In case of failure, @secid will be set to zero.
1087 *
1088 * Security hooks for individual messages held in System V IPC message queues
1089 * @msg_msg_alloc_security:
1090 * Allocate and attach a security structure to the msg->security field.
1091 * The security field is initialized to NULL when the structure is first
1092 * created.
1093 * @msg contains the message structure to be modified.
1094 * Return 0 if operation was successful and permission is granted.
1095 * @msg_msg_free_security:
1096 * Deallocate the security structure for this message.
1097 * @msg contains the message structure to be modified.
1098 *
1099 * Security hooks for System V IPC Message Queues
1100 *
1101 * @msg_queue_alloc_security:
1102 * Allocate and attach a security structure to the
1103 * msq->q_perm.security field. The security field is initialized to
1104 * NULL when the structure is first created.
1105 * @msq contains the message queue structure to be modified.
1106 * Return 0 if operation was successful and permission is granted.
1107 * @msg_queue_free_security:
1108 * Deallocate security structure for this message queue.
1109 * @msq contains the message queue structure to be modified.
1110 * @msg_queue_associate:
1111 * Check permission when a message queue is requested through the
1112 * msgget system call. This hook is only called when returning the
1113 * message queue identifier for an existing message queue, not when a
1114 * new message queue is created.
1115 * @msq contains the message queue to act upon.
1116 * @msqflg contains the operation control flags.
1117 * Return 0 if permission is granted.
1118 * @msg_queue_msgctl:
1119 * Check permission when a message control operation specified by @cmd
1120 * is to be performed on the message queue @msq.
1121 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1122 * @msq contains the message queue to act upon. May be NULL.
1123 * @cmd contains the operation to be performed.
1124 * Return 0 if permission is granted.
1125 * @msg_queue_msgsnd:
1126 * Check permission before a message, @msg, is enqueued on the message
1127 * queue, @msq.
1128 * @msq contains the message queue to send message to.
1129 * @msg contains the message to be enqueued.
1130 * @msqflg contains operational flags.
1131 * Return 0 if permission is granted.
1132 * @msg_queue_msgrcv:
1133 * Check permission before a message, @msg, is removed from the message
1134 * queue, @msq. The @target task structure contains a pointer to the
1135 * process that will be receiving the message (not equal to the current
1136 * process when inline receives are being performed).
1137 * @msq contains the message queue to retrieve message from.
1138 * @msg contains the message destination.
1139 * @target contains the task structure for recipient process.
1140 * @type contains the type of message requested.
1141 * @mode contains the operational flags.
1142 * Return 0 if permission is granted.
1143 *
1144 * Security hooks for System V Shared Memory Segments
1145 *
1146 * @shm_alloc_security:
1147 * Allocate and attach a security structure to the shp->shm_perm.security
1148 * field. The security field is initialized to NULL when the structure is
1149 * first created.
1150 * @shp contains the shared memory structure to be modified.
1151 * Return 0 if operation was successful and permission is granted.
1152 * @shm_free_security:
1153 * Deallocate the security struct for this memory segment.
1154 * @shp contains the shared memory structure to be modified.
1155 * @shm_associate:
1156 * Check permission when a shared memory region is requested through the
1157 * shmget system call. This hook is only called when returning the shared
1158 * memory region identifier for an existing region, not when a new shared
1159 * memory region is created.
1160 * @shp contains the shared memory structure to be modified.
1161 * @shmflg contains the operation control flags.
1162 * Return 0 if permission is granted.
1163 * @shm_shmctl:
1164 * Check permission when a shared memory control operation specified by
1165 * @cmd is to be performed on the shared memory region @shp.
1166 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1167 * @shp contains shared memory structure to be modified.
1168 * @cmd contains the operation to be performed.
1169 * Return 0 if permission is granted.
1170 * @shm_shmat:
1171 * Check permissions prior to allowing the shmat system call to attach the
1172 * shared memory segment @shp to the data segment of the calling process.
1173 * The attaching address is specified by @shmaddr.
1174 * @shp contains the shared memory structure to be modified.
1175 * @shmaddr contains the address to attach memory region to.
1176 * @shmflg contains the operational flags.
1177 * Return 0 if permission is granted.
1178 *
1179 * Security hooks for System V Semaphores
1180 *
1181 * @sem_alloc_security:
1182 * Allocate and attach a security structure to the sma->sem_perm.security
1183 * field. The security field is initialized to NULL when the structure is
1184 * first created.
1185 * @sma contains the semaphore structure
1186 * Return 0 if operation was successful and permission is granted.
1187 * @sem_free_security:
1188 * deallocate security struct for this semaphore
1189 * @sma contains the semaphore structure.
1190 * @sem_associate:
1191 * Check permission when a semaphore is requested through the semget
1192 * system call. This hook is only called when returning the semaphore
1193 * identifier for an existing semaphore, not when a new one must be
1194 * created.
1195 * @sma contains the semaphore structure.
1196 * @semflg contains the operation control flags.
1197 * Return 0 if permission is granted.
1198 * @sem_semctl:
1199 * Check permission when a semaphore operation specified by @cmd is to be
1200 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1201 * IPC_INFO or SEM_INFO.
1202 * @sma contains the semaphore structure. May be NULL.
1203 * @cmd contains the operation to be performed.
1204 * Return 0 if permission is granted.
1205 * @sem_semop
1206 * Check permissions before performing operations on members of the
1207 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1208 * may be modified.
1209 * @sma contains the semaphore structure.
1210 * @sops contains the operations to perform.
1211 * @nsops contains the number of operations to perform.
1212 * @alter contains the flag indicating whether changes are to be made.
1213 * Return 0 if permission is granted.
1214 *
1215 * @ptrace_access_check:
1216 * Check permission before allowing the current process to trace the
1217 * @child process.
1218 * Security modules may also want to perform a process tracing check
1219 * during an execve in the set_security or apply_creds hooks of
1220 * tracing check during an execve in the bprm_set_creds hook of
1221 * binprm_security_ops if the process is being traced and its security
1222 * attributes would be changed by the execve.
1223 * @child contains the task_struct structure for the target process.
1224 * @mode contains the PTRACE_MODE flags indicating the form of access.
1225 * Return 0 if permission is granted.
1226 * @ptrace_traceme:
1227 * Check that the @parent process has sufficient permission to trace the
1228 * current process before allowing the current process to present itself
1229 * to the @parent process for tracing.
1230 * The parent process will still have to undergo the ptrace_access_check
1231 * checks before it is allowed to trace this one.
1232 * @parent contains the task_struct structure for debugger process.
1233 * Return 0 if permission is granted.
1234 * @capget:
1235 * Get the @effective, @inheritable, and @permitted capability sets for
1236 * the @target process. The hook may also perform permission checking to
1237 * determine if the current process is allowed to see the capability sets
1238 * of the @target process.
1239 * @target contains the task_struct structure for target process.
1240 * @effective contains the effective capability set.
1241 * @inheritable contains the inheritable capability set.
1242 * @permitted contains the permitted capability set.
1243 * Return 0 if the capability sets were successfully obtained.
1244 * @capset:
1245 * Set the @effective, @inheritable, and @permitted capability sets for
1246 * the current process.
1247 * @new contains the new credentials structure for target process.
1248 * @old contains the current credentials structure for target process.
1249 * @effective contains the effective capability set.
1250 * @inheritable contains the inheritable capability set.
1251 * @permitted contains the permitted capability set.
1252 * Return 0 and update @new if permission is granted.
1253 * @capable:
1254 * Check whether the @tsk process has the @cap capability in the indicated
1255 * credentials.
1256 * @tsk contains the task_struct for the process.
1257 * @cred contains the credentials to use.
1258 * @cap contains the capability <include/linux/capability.h>.
1259 * @audit: Whether to write an audit message or not
1260 * Return 0 if the capability is granted for @tsk.
1261 * @sysctl:
1262 * Check permission before accessing the @table sysctl variable in the
1263 * manner specified by @op.
1264 * @table contains the ctl_table structure for the sysctl variable.
1265 * @op contains the operation (001 = search, 002 = write, 004 = read).
1266 * Return 0 if permission is granted.
1267 * @syslog:
1268 * Check permission before accessing the kernel message ring or changing
1269 * logging to the console.
1270 * See the syslog(2) manual page for an explanation of the @type values.
1271 * @type contains the type of action.
1272 * @from_file indicates the context of action (if it came from /proc).
1273 * Return 0 if permission is granted.
1274 * @settime:
1275 * Check permission to change the system time.
1276 * struct timespec and timezone are defined in include/linux/time.h
1277 * @ts contains new time
1278 * @tz contains new timezone
1279 * Return 0 if permission is granted.
1280 * @vm_enough_memory:
1281 * Check permissions for allocating a new virtual mapping.
1282 * @mm contains the mm struct it is being added to.
1283 * @pages contains the number of pages.
1284 * Return 0 if permission is granted.
1285 *
1286 * @secid_to_secctx:
1287 * Convert secid to security context. If secdata is NULL the length of
1288 * the result will be returned in seclen, but no secdata will be returned.
1289 * This does mean that the length could change between calls to check the
1290 * length and the next call which actually allocates and returns the secdata.
1291 * @secid contains the security ID.
1292 * @secdata contains the pointer that stores the converted security context.
1293 * @seclen pointer which contains the length of the data
1294 * @secctx_to_secid:
1295 * Convert security context to secid.
1296 * @secid contains the pointer to the generated security ID.
1297 * @secdata contains the security context.
1298 *
1299 * @release_secctx:
1300 * Release the security context.
1301 * @secdata contains the security context.
1302 * @seclen contains the length of the security context.
1303 *
1304 * Security hooks for Audit
1305 *
1306 * @audit_rule_init:
1307 * Allocate and initialize an LSM audit rule structure.
1308 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1309 * @op contains the operator the rule uses.
1310 * @rulestr contains the context where the rule will be applied to.
1311 * @lsmrule contains a pointer to receive the result.
1312 * Return 0 if @lsmrule has been successfully set,
1313 * -EINVAL in case of an invalid rule.
1314 *
1315 * @audit_rule_known:
1316 * Specifies whether given @rule contains any fields related to current LSM.
1317 * @rule contains the audit rule of interest.
1318 * Return 1 in case of relation found, 0 otherwise.
1319 *
1320 * @audit_rule_match:
1321 * Determine if given @secid matches a rule previously approved
1322 * by @audit_rule_known.
1323 * @secid contains the security id in question.
1324 * @field contains the field which relates to current LSM.
1325 * @op contains the operator that will be used for matching.
1326 * @rule points to the audit rule that will be checked against.
1327 * @actx points to the audit context associated with the check.
1328 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1329 *
1330 * @audit_rule_free:
1331 * Deallocate the LSM audit rule structure previously allocated by
1332 * audit_rule_init.
1333 * @rule contains the allocated rule
1334 *
1335 * @inode_notifysecctx:
1336 * Notify the security module of what the security context of an inode
1337 * should be. Initializes the incore security context managed by the
1338 * security module for this inode. Example usage: NFS client invokes
1339 * this hook to initialize the security context in its incore inode to the
1340 * value provided by the server for the file when the server returned the
1341 * file's attributes to the client.
1342 *
1343 * Must be called with inode->i_mutex locked.
1344 *
1345 * @inode we wish to set the security context of.
1346 * @ctx contains the string which we wish to set in the inode.
1347 * @ctxlen contains the length of @ctx.
1348 *
1349 * @inode_setsecctx:
1350 * Change the security context of an inode. Updates the
1351 * incore security context managed by the security module and invokes the
1352 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1353 * xattrs that represent the context. Example usage: NFS server invokes
1354 * this hook to change the security context in its incore inode and on the
1355 * backing filesystem to a value provided by the client on a SETATTR
1356 * operation.
1357 *
1358 * Must be called with inode->i_mutex locked.
1359 *
1360 * @dentry contains the inode we wish to set the security context of.
1361 * @ctx contains the string which we wish to set in the inode.
1362 * @ctxlen contains the length of @ctx.
1363 *
1364 * @inode_getsecctx:
1365 * Returns a string containing all relavent security context information
1366 *
1367 * @inode we wish to set the security context of.
1368 * @ctx is a pointer in which to place the allocated security context.
1369 * @ctxlen points to the place to put the length of @ctx.
1370 * This is the main security structure.
1371 */
1417 #ifdef CONFIG_SECURITY_PATH
1431 mode_t mode);
1434 #endif
1467 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1468 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1497 gfp_t gfp);
1570 #ifdef CONFIG_SECURITY_NETWORK
1594 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1614 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1617 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1622 u32 secid);
1632 /* key management security hooks */
1633 #ifdef CONFIG_KEYS
1638 key_perm_t perm);
1642 #ifdef CONFIG_AUDIT
1649 };
1651 /* prototypes */
1656 /* Security operations */
1727 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1728 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1812 };
1815 {
1816 }
1819 {
1820 }
1822 /*
1823 * This is the default capabilities functionality. Most of these functions
1824 * are just stubbed out, but a few must call the proper capable code.
1825 */
1828 {
1830 }
1834 {
1836 }
1839 {
1841 }
1847 {
1849 }
1856 {
1858 }
1861 {
1863 }
1866 {
1873 }
1877 {
1882 SECURITY_CAP_NOAUDIT);
1885 }
1888 {
1890 }
1894 {
1896 }
1899 {
1901 }
1904 {
1906 }
1909 {
1911 }
1914 {
1917 }
1920 {
1923 }
1926 {
1927 /* If current->mm is a kernel thread then we will pass NULL,
1928 for this specific case that is fine */
1930 }
1933 {
1935 }
1938 {
1940 }
1943 {
1944 }
1947 {
1948 }
1951 {
1953 }
1956 {
1958 }
1961 { }
1964 {
1966 }
1969 {
1971 }
1975 {
1977 }
1980 {
1982 }
1987 {
1989 }
1992 {
1994 }
1998 {
2000 }
2004 {
2006 }
2010 { }
2013 {
2015 }
2018 {
2020 }
2023 { }
2030 {
2032 }
2037 {
2039 }
2044 {
2046 }
2050 {
2052 }
2057 {
2059 }
2064 {
2066 }
2070 {
2072 }
2077 {
2079 }
2085 {
2087 }
2090 {
2092 }
2096 {
2098 }
2101 {
2103 }
2107 {
2109 }
2113 {
2115 }
2119 {
2121 }
2125 { }
2129 {
2131 }
2134 {
2136 }
2140 {
2142 }
2145 {
2147 }
2150 {
2152 }
2154 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2155 {
2157 }
2159 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2160 {
2162 }
2164 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2165 {
2167 }
2170 {
2172 }
2175 {
2177 }
2180 {
2182 }
2185 { }
2189 {
2191 }
2198 {
2200 }
2205 {
2207 }
2210 {
2212 }
2216 {
2218 }
2221 {
2223 }
2228 {
2230 }
2233 {
2235 }
2239 {
2241 }
2244 {
2246 }
2249 {
2251 }
2254 { }
2258 gfp_t gfp)
2259 {
2261 }
2265 {
2266 }
2269 {
2271 }
2275 {
2277 }
2280 {
2282 }
2287 {
2289 }
2292 {
2294 }
2297 {
2299 }
2302 {
2304 }
2307 {
2309 }
2312 {
2314 }
2317 {
2319 }
2322 {
2324 }
2329 {
2331 }
2334 {
2336 }
2339 {
2341 }
2344 {
2346 }
2350 u32 secid)
2351 {
2353 }
2356 {
2358 }
2364 {
2366 }
2369 { }
2373 {
2375 }
2378 {
2380 }
2383 {
2385 }
2388 { }
2391 {
2393 }
2396 { }
2400 {
2402 }
2405 {
2407 }
2411 {
2413 }
2419 {
2421 }
2424 {
2426 }
2429 { }
2433 {
2435 }
2438 {
2440 }
2444 {
2446 }
2449 {
2451 }
2454 { }
2457 {
2459 }
2462 {
2464 }
2469 {
2471 }
2474 { }
2477 {
2479 }
2481 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2482 {
2484 }
2487 {
2489 }
2492 {
2494 }
2497 {
2499 }
2502 u32 seclen,
2504 {
2506 }
2509 {
2510 }
2513 {
2515 }
2517 {
2519 }
2521 {
2523 }
2526 #ifdef CONFIG_SECURITY_NETWORK
2573 {
2575 }
2579 {
2581 }
2585 {
2587 }
2593 {
2595 }
2600 {
2602 }
2607 {
2609 }
2612 {
2614 }
2618 {
2620 }
2624 {
2626 }
2631 {
2633 }
2636 {
2638 }
2641 {
2643 }
2647 {
2649 }
2653 {
2655 }
2658 {
2660 }
2663 {
2665 }
2669 {
2671 }
2673 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2674 {
2676 }
2679 {
2681 }
2684 {
2685 }
2688 {
2689 }
2692 {
2693 }
2695 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2696 {
2697 }
2700 {
2701 }
2705 {
2707 }
2711 {
2712 }
2716 {
2717 }
2720 {
2722 }
2725 {
2726 }
2729 {
2730 }
2733 {
2735 }
2738 {
2739 }
2742 {
2744 }
2747 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2766 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2767 {
2769 }
2771 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2772 {
2774 }
2777 {
2778 }
2781 {
2783 }
2787 {
2789 }
2793 {
2795 }
2798 {
2799 }
2802 {
2804 }
2807 {
2809 }
2813 {
2815 }
2818 {
2820 }
2823 {
2824 }
2828 #ifdef CONFIG_SECURITY_PATH
2842 mode_t mode);
2847 {
2849 }
2853 {
2855 }
2858 {
2860 }
2864 {
2866 }
2869 {
2871 }
2875 {
2877 }
2882 {
2884 }
2890 {
2892 }
2896 mode_t mode)
2897 {
2899 }
2902 {
2904 }
2907 {
2909 }
2912 #ifdef CONFIG_KEYS
2913 #ifdef CONFIG_SECURITY
2921 #else
2926 {
2928 }
2931 {
2932 }
2936 key_perm_t perm)
2937 {
2939 }
2942 {
2945 }
2947 #endif
2950 #ifdef CONFIG_AUDIT
2951 #ifdef CONFIG_SECURITY
2958 #else
2962 {
2964 }
2967 {
2969 }
2973 {
2975 }
2978 { }
2983 #ifdef CONFIG_SECURITYFS
2995 {
2997 }
3000 mode_t mode,
3004 {
3006 }
3009 {}
3011 #endif
3013 #ifdef CONFIG_SECURITY
3016 {
3018 }
3021 {
3023 }
3025 #else
3028 {
3030 }
3033 { }