| blob | b8246a8df7d2dc2ecc864ac192d694b369dd12d6 |
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);
101 #ifdef CONFIG_MMU
104 #else
105 #define dac_mmap_min_addr 0UL
106 #endif
108 /*
109 * Values used in the task_security_ops calls
110 */
111 /* setuid or setgid, id0 == uid or gid */
112 #define LSM_SETID_ID 1
114 /* setreuid or setregid, id0 == real, id1 == eff */
115 #define LSM_SETID_RE 2
117 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
118 #define LSM_SETID_RES 4
120 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
121 #define LSM_SETID_FS 8
123 /* forward declares to avoid warnings */
127 /* bprm->unsafe reasons */
128 #define LSM_UNSAFE_SHARE 1
129 #define LSM_UNSAFE_PTRACE 2
130 #define LSM_UNSAFE_PTRACE_CAP 4
132 #ifdef CONFIG_MMU
133 /*
134 * If a hint addr is less than mmap_min_addr change hint to be as
135 * low as possible but still greater than mmap_min_addr
136 */
138 {
144 }
147 #endif
149 #ifdef CONFIG_SECURITY
155 };
158 {
162 }
165 {
175 }
177 /**
178 * struct security_operations - main security structure
179 *
180 * Security module identifier.
181 *
182 * @name:
183 * A string that acts as a unique identifeir for the LSM with max number
184 * of characters = SECURITY_NAME_MAX.
185 *
186 * Security hooks for program execution operations.
187 *
188 * @bprm_set_creds:
189 * Save security information in the bprm->security field, typically based
190 * on information about the bprm->file, for later use by the apply_creds
191 * hook. This hook may also optionally check permissions (e.g. for
192 * transitions between security domains).
193 * This hook may be called multiple times during a single execve, e.g. for
194 * interpreters. The hook can tell whether it has already been called by
195 * checking to see if @bprm->security is non-NULL. If so, then the hook
196 * may decide either to retain the security information saved earlier or
197 * to replace it.
198 * @bprm contains the linux_binprm structure.
199 * Return 0 if the hook is successful and permission is granted.
200 * @bprm_check_security:
201 * This hook mediates the point when a search for a binary handler will
202 * begin. It allows a check the @bprm->security value which is set in the
203 * preceding set_creds call. The primary difference from set_creds is
204 * that the argv list and envp list are reliably available in @bprm. This
205 * hook may be called multiple times during a single execve; and in each
206 * pass set_creds is called first.
207 * @bprm contains the linux_binprm structure.
208 * Return 0 if the hook is successful and permission is granted.
209 * @bprm_committing_creds:
210 * Prepare to install the new security attributes of a process being
211 * transformed by an execve operation, based on the old credentials
212 * pointed to by @current->cred and the information set in @bprm->cred by
213 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
214 * This hook is a good place to perform state changes on the process such
215 * as closing open file descriptors to which access will no longer be
216 * granted when the attributes are changed. This is called immediately
217 * before commit_creds().
218 * @bprm_committed_creds:
219 * Tidy up after the installation of the new security attributes of a
220 * process being transformed by an execve operation. The new credentials
221 * have, by this point, been set to @current->cred. @bprm points to the
222 * linux_binprm structure. This hook is a good place to perform state
223 * changes on the process such as clearing out non-inheritable signal
224 * state. This is called immediately after commit_creds().
225 * @bprm_secureexec:
226 * Return a boolean value (0 or 1) indicating whether a "secure exec"
227 * is required. The flag is passed in the auxiliary table
228 * on the initial stack to the ELF interpreter to indicate whether libc
229 * should enable secure mode.
230 * @bprm contains the linux_binprm structure.
231 *
232 * Security hooks for filesystem operations.
233 *
234 * @sb_alloc_security:
235 * Allocate and attach a security structure to the sb->s_security field.
236 * The s_security field is initialized to NULL when the structure is
237 * allocated.
238 * @sb contains the super_block structure to be modified.
239 * Return 0 if operation was successful.
240 * @sb_free_security:
241 * Deallocate and clear the sb->s_security field.
242 * @sb contains the super_block structure to be modified.
243 * @sb_statfs:
244 * Check permission before obtaining filesystem statistics for the @mnt
245 * mountpoint.
246 * @dentry is a handle on the superblock for the filesystem.
247 * Return 0 if permission is granted.
248 * @sb_mount:
249 * Check permission before an object specified by @dev_name is mounted on
250 * the mount point named by @nd. For an ordinary mount, @dev_name
251 * identifies a device if the file system type requires a device. For a
252 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
253 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
254 * pathname of the object being mounted.
255 * @dev_name contains the name for object being mounted.
256 * @path contains the path for mount point object.
257 * @type contains the filesystem type.
258 * @flags contains the mount flags.
259 * @data contains the filesystem-specific data.
260 * Return 0 if permission is granted.
261 * @sb_copy_data:
262 * Allow mount option data to be copied prior to parsing by the filesystem,
263 * so that the security module can extract security-specific mount
264 * options cleanly (a filesystem may modify the data e.g. with strsep()).
265 * This also allows the original mount data to be stripped of security-
266 * specific options to avoid having to make filesystems aware of them.
267 * @type the type of filesystem being mounted.
268 * @orig the original mount data copied from userspace.
269 * @copy copied data which will be passed to the security module.
270 * Returns 0 if the copy was successful.
271 * @sb_umount:
272 * Check permission before the @mnt file system is unmounted.
273 * @mnt contains the mounted file system.
274 * @flags contains the unmount flags, e.g. MNT_FORCE.
275 * Return 0 if permission is granted.
276 * @sb_pivotroot:
277 * Check permission before pivoting the root filesystem.
278 * @old_path contains the path for the new location of the current root (put_old).
279 * @new_path contains the path for the new root (new_root).
280 * Return 0 if permission is granted.
281 * @sb_set_mnt_opts:
282 * Set the security relevant mount options used for a superblock
283 * @sb the superblock to set security mount options for
284 * @opts binary data structure containing all lsm mount data
285 * @sb_clone_mnt_opts:
286 * Copy all security options from a given superblock to another
287 * @oldsb old superblock which contain information to clone
288 * @newsb new superblock which needs filled in
289 * @sb_parse_opts_str:
290 * Parse a string of security data filling in the opts structure
291 * @options string containing all mount options known by the LSM
292 * @opts binary data structure usable by the LSM
293 *
294 * Security hooks for inode operations.
295 *
296 * @inode_alloc_security:
297 * Allocate and attach a security structure to @inode->i_security. The
298 * i_security field is initialized to NULL when the inode structure is
299 * allocated.
300 * @inode contains the inode structure.
301 * Return 0 if operation was successful.
302 * @inode_free_security:
303 * @inode contains the inode structure.
304 * Deallocate the inode security structure and set @inode->i_security to
305 * NULL.
306 * @inode_init_security:
307 * Obtain the security attribute name suffix and value to set on a newly
308 * created inode and set up the incore security field for the new inode.
309 * This hook is called by the fs code as part of the inode creation
310 * transaction and provides for atomic labeling of the inode, unlike
311 * the post_create/mkdir/... hooks called by the VFS. The hook function
312 * is expected to allocate the name and value via kmalloc, with the caller
313 * being responsible for calling kfree after using them.
314 * If the security module does not use security attributes or does
315 * not wish to put a security attribute on this particular inode,
316 * then it should return -EOPNOTSUPP to skip this processing.
317 * @inode contains the inode structure of the newly created inode.
318 * @dir contains the inode structure of the parent directory.
319 * @name will be set to the allocated name suffix (e.g. selinux).
320 * @value will be set to the allocated attribute value.
321 * @len will be set to the length of the value.
322 * Returns 0 if @name and @value have been successfully set,
323 * -EOPNOTSUPP if no security attribute is needed, or
324 * -ENOMEM on memory allocation failure.
325 * @inode_create:
326 * Check permission to create a regular file.
327 * @dir contains inode structure of the parent of the new file.
328 * @dentry contains the dentry structure for the file to be created.
329 * @mode contains the file mode of the file to be created.
330 * Return 0 if permission is granted.
331 * @inode_link:
332 * Check permission before creating a new hard link to a file.
333 * @old_dentry contains the dentry structure for an existing link to the file.
334 * @dir contains the inode structure of the parent directory of the new link.
335 * @new_dentry contains the dentry structure for the new link.
336 * Return 0 if permission is granted.
337 * @path_link:
338 * Check permission before creating a new hard link to a file.
339 * @old_dentry contains the dentry structure for an existing link
340 * to the file.
341 * @new_dir contains the path structure of the parent directory of
342 * the new link.
343 * @new_dentry contains the dentry structure for the new link.
344 * Return 0 if permission is granted.
345 * @inode_unlink:
346 * Check the permission to remove a hard link to a file.
347 * @dir contains the inode structure of parent directory of the file.
348 * @dentry contains the dentry structure for file to be unlinked.
349 * Return 0 if permission is granted.
350 * @path_unlink:
351 * Check the permission to remove a hard link to a file.
352 * @dir contains the path structure of parent directory of the file.
353 * @dentry contains the dentry structure for file to be unlinked.
354 * Return 0 if permission is granted.
355 * @inode_symlink:
356 * Check the permission to create a symbolic link to a file.
357 * @dir contains the inode structure of parent directory of the symbolic link.
358 * @dentry contains the dentry structure of the symbolic link.
359 * @old_name contains the pathname of file.
360 * Return 0 if permission is granted.
361 * @path_symlink:
362 * Check the permission to create a symbolic link to a file.
363 * @dir contains the path structure of parent directory of
364 * the symbolic link.
365 * @dentry contains the dentry structure of the symbolic link.
366 * @old_name contains the pathname of file.
367 * Return 0 if permission is granted.
368 * @inode_mkdir:
369 * Check permissions to create a new directory in the existing directory
370 * associated with inode strcture @dir.
371 * @dir containst the inode structure of parent of the directory to be created.
372 * @dentry contains the dentry structure of new directory.
373 * @mode contains the mode of new directory.
374 * Return 0 if permission is granted.
375 * @path_mkdir:
376 * Check permissions to create a new directory in the existing directory
377 * associated with path strcture @path.
378 * @dir containst the path structure of parent of the directory
379 * to be created.
380 * @dentry contains the dentry structure of new directory.
381 * @mode contains the mode of new directory.
382 * Return 0 if permission is granted.
383 * @inode_rmdir:
384 * Check the permission to remove a directory.
385 * @dir contains the inode structure of parent of the directory to be removed.
386 * @dentry contains the dentry structure of directory to be removed.
387 * Return 0 if permission is granted.
388 * @path_rmdir:
389 * Check the permission to remove a directory.
390 * @dir contains the path structure of parent of the directory to be
391 * removed.
392 * @dentry contains the dentry structure of directory to be removed.
393 * Return 0 if permission is granted.
394 * @inode_mknod:
395 * Check permissions when creating a special file (or a socket or a fifo
396 * file created via the mknod system call). Note that if mknod operation
397 * is being done for a regular file, then the create hook will be called
398 * and not this hook.
399 * @dir contains the inode structure of parent of the new file.
400 * @dentry contains the dentry structure of the new file.
401 * @mode contains the mode of the new file.
402 * @dev contains the device number.
403 * Return 0 if permission is granted.
404 * @path_mknod:
405 * Check permissions when creating a file. Note that this hook is called
406 * even if mknod operation is being done for a regular file.
407 * @dir contains the path structure of parent of the new file.
408 * @dentry contains the dentry structure of the new file.
409 * @mode contains the mode of the new file.
410 * @dev contains the undecoded device number. Use new_decode_dev() to get
411 * the decoded device number.
412 * Return 0 if permission is granted.
413 * @inode_rename:
414 * Check for permission to rename a file or directory.
415 * @old_dir contains the inode structure for parent of the old link.
416 * @old_dentry contains the dentry structure of the old link.
417 * @new_dir contains the inode structure for parent of the new link.
418 * @new_dentry contains the dentry structure of the new link.
419 * Return 0 if permission is granted.
420 * @path_rename:
421 * Check for permission to rename a file or directory.
422 * @old_dir contains the path structure for parent of the old link.
423 * @old_dentry contains the dentry structure of the old link.
424 * @new_dir contains the path structure for parent of the new link.
425 * @new_dentry contains the dentry structure of the new link.
426 * Return 0 if permission is granted.
427 * @path_chmod:
428 * Check for permission to change DAC's permission of a file or directory.
429 * @dentry contains the dentry structure.
430 * @mnt contains the vfsmnt structure.
431 * @mode contains DAC's mode.
432 * Return 0 if permission is granted.
433 * @path_chown:
434 * Check for permission to change owner/group of a file or directory.
435 * @path contains the path structure.
436 * @uid contains new owner's ID.
437 * @gid contains new group's ID.
438 * Return 0 if permission is granted.
439 * @path_chroot:
440 * Check for permission to change root directory.
441 * @path contains the path structure.
442 * Return 0 if permission is granted.
443 * @inode_readlink:
444 * Check the permission to read the symbolic link.
445 * @dentry contains the dentry structure for the file link.
446 * Return 0 if permission is granted.
447 * @inode_follow_link:
448 * Check permission to follow a symbolic link when looking up a pathname.
449 * @dentry contains the dentry structure for the link.
450 * @nd contains the nameidata structure for the parent directory.
451 * Return 0 if permission is granted.
452 * @inode_permission:
453 * Check permission before accessing an inode. This hook is called by the
454 * existing Linux permission function, so a security module can use it to
455 * provide additional checking for existing Linux permission checks.
456 * Notice that this hook is called when a file is opened (as well as many
457 * other operations), whereas the file_security_ops permission hook is
458 * called when the actual read/write operations are performed.
459 * @inode contains the inode structure to check.
460 * @mask contains the permission mask.
461 * @nd contains the nameidata (may be NULL).
462 * Return 0 if permission is granted.
463 * @inode_setattr:
464 * Check permission before setting file attributes. Note that the kernel
465 * call to notify_change is performed from several locations, whenever
466 * file attributes change (such as when a file is truncated, chown/chmod
467 * operations, transferring disk quotas, etc).
468 * @dentry contains the dentry structure for the file.
469 * @attr is the iattr structure containing the new file attributes.
470 * Return 0 if permission is granted.
471 * @path_truncate:
472 * Check permission before truncating a file.
473 * @path contains the path structure for the file.
474 * Return 0 if permission is granted.
475 * @inode_getattr:
476 * Check permission before obtaining file attributes.
477 * @mnt is the vfsmount where the dentry was looked up
478 * @dentry contains the dentry structure for the file.
479 * Return 0 if permission is granted.
480 * @inode_setxattr:
481 * Check permission before setting the extended attributes
482 * @value identified by @name for @dentry.
483 * Return 0 if permission is granted.
484 * @inode_post_setxattr:
485 * Update inode security field after successful setxattr operation.
486 * @value identified by @name for @dentry.
487 * @inode_getxattr:
488 * Check permission before obtaining the extended attributes
489 * identified by @name for @dentry.
490 * Return 0 if permission is granted.
491 * @inode_listxattr:
492 * Check permission before obtaining the list of extended attribute
493 * names for @dentry.
494 * Return 0 if permission is granted.
495 * @inode_removexattr:
496 * Check permission before removing the extended attribute
497 * identified by @name for @dentry.
498 * Return 0 if permission is granted.
499 * @inode_getsecurity:
500 * Retrieve a copy of the extended attribute representation of the
501 * security label associated with @name for @inode via @buffer. Note that
502 * @name is the remainder of the attribute name after the security prefix
503 * has been removed. @alloc is used to specify of the call should return a
504 * value via the buffer or just the value length Return size of buffer on
505 * success.
506 * @inode_setsecurity:
507 * Set the security label associated with @name for @inode from the
508 * extended attribute value @value. @size indicates the size of the
509 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
510 * Note that @name is the remainder of the attribute name after the
511 * security. prefix has been removed.
512 * Return 0 on success.
513 * @inode_listsecurity:
514 * Copy the extended attribute names for the security labels
515 * associated with @inode into @buffer. The maximum size of @buffer
516 * is specified by @buffer_size. @buffer may be NULL to request
517 * the size of the buffer required.
518 * Returns number of bytes used/required on success.
519 * @inode_need_killpriv:
520 * Called when an inode has been changed.
521 * @dentry is the dentry being changed.
522 * Return <0 on error to abort the inode change operation.
523 * Return 0 if inode_killpriv does not need to be called.
524 * Return >0 if inode_killpriv does need to be called.
525 * @inode_killpriv:
526 * The setuid bit is being removed. Remove similar security labels.
527 * Called with the dentry->d_inode->i_mutex held.
528 * @dentry is the dentry being changed.
529 * Return 0 on success. If error is returned, then the operation
530 * causing setuid bit removal is failed.
531 * @inode_getsecid:
532 * Get the secid associated with the node.
533 * @inode contains a pointer to the inode.
534 * @secid contains a pointer to the location where result will be saved.
535 * In case of failure, @secid will be set to zero.
536 *
537 * Security hooks for file operations
538 *
539 * @file_permission:
540 * Check file permissions before accessing an open file. This hook is
541 * called by various operations that read or write files. A security
542 * module can use this hook to perform additional checking on these
543 * operations, e.g. to revalidate permissions on use to support privilege
544 * bracketing or policy changes. Notice that this hook is used when the
545 * actual read/write operations are performed, whereas the
546 * inode_security_ops hook is called when a file is opened (as well as
547 * many other operations).
548 * Caveat: Although this hook can be used to revalidate permissions for
549 * various system call operations that read or write files, it does not
550 * address the revalidation of permissions for memory-mapped files.
551 * Security modules must handle this separately if they need such
552 * revalidation.
553 * @file contains the file structure being accessed.
554 * @mask contains the requested permissions.
555 * Return 0 if permission is granted.
556 * @file_alloc_security:
557 * Allocate and attach a security structure to the file->f_security field.
558 * The security field is initialized to NULL when the structure is first
559 * created.
560 * @file contains the file structure to secure.
561 * Return 0 if the hook is successful and permission is granted.
562 * @file_free_security:
563 * Deallocate and free any security structures stored in file->f_security.
564 * @file contains the file structure being modified.
565 * @file_ioctl:
566 * @file contains the file structure.
567 * @cmd contains the operation to perform.
568 * @arg contains the operational arguments.
569 * Check permission for an ioctl operation on @file. Note that @arg can
570 * sometimes represents a user space pointer; in other cases, it may be a
571 * simple integer value. When @arg represents a user space pointer, it
572 * should never be used by the security module.
573 * Return 0 if permission is granted.
574 * @file_mmap :
575 * Check permissions for a mmap operation. The @file may be NULL, e.g.
576 * if mapping anonymous memory.
577 * @file contains the file structure for file to map (may be NULL).
578 * @reqprot contains the protection requested by the application.
579 * @prot contains the protection that will be applied by the kernel.
580 * @flags contains the operational flags.
581 * Return 0 if permission is granted.
582 * @file_mprotect:
583 * Check permissions before changing memory access permissions.
584 * @vma contains the memory region to modify.
585 * @reqprot contains the protection requested by the application.
586 * @prot contains the protection that will be applied by the kernel.
587 * Return 0 if permission is granted.
588 * @file_lock:
589 * Check permission before performing file locking operations.
590 * Note: this hook mediates both flock and fcntl style locks.
591 * @file contains the file structure.
592 * @cmd contains the posix-translated lock operation to perform
593 * (e.g. F_RDLCK, F_WRLCK).
594 * Return 0 if permission is granted.
595 * @file_fcntl:
596 * Check permission before allowing the file operation specified by @cmd
597 * from being performed on the file @file. Note that @arg can sometimes
598 * represents a user space pointer; in other cases, it may be a simple
599 * integer value. When @arg represents a user space pointer, it should
600 * never be used by the security module.
601 * @file contains the file structure.
602 * @cmd contains the operation to be performed.
603 * @arg contains the operational arguments.
604 * Return 0 if permission is granted.
605 * @file_set_fowner:
606 * Save owner security information (typically from current->security) in
607 * file->f_security for later use by the send_sigiotask hook.
608 * @file contains the file structure to update.
609 * Return 0 on success.
610 * @file_send_sigiotask:
611 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
612 * process @tsk. Note that this hook is sometimes called from interrupt.
613 * Note that the fown_struct, @fown, is never outside the context of a
614 * struct file, so the file structure (and associated security information)
615 * can always be obtained:
616 * container_of(fown, struct file, f_owner)
617 * @tsk contains the structure of task receiving signal.
618 * @fown contains the file owner information.
619 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
620 * Return 0 if permission is granted.
621 * @file_receive:
622 * This hook allows security modules to control the ability of a process
623 * to receive an open file descriptor via socket IPC.
624 * @file contains the file structure being received.
625 * Return 0 if permission is granted.
626 *
627 * Security hook for dentry
628 *
629 * @dentry_open
630 * Save open-time permission checking state for later use upon
631 * file_permission, and recheck access if anything has changed
632 * since inode_permission.
633 *
634 * Security hooks for task operations.
635 *
636 * @task_create:
637 * Check permission before creating a child process. See the clone(2)
638 * manual page for definitions of the @clone_flags.
639 * @clone_flags contains the flags indicating what should be shared.
640 * Return 0 if permission is granted.
641 * @cred_alloc_blank:
642 * @cred points to the credentials.
643 * @gfp indicates the atomicity of any memory allocations.
644 * Only allocate sufficient memory and attach to @cred such that
645 * cred_transfer() will not get ENOMEM.
646 * @cred_free:
647 * @cred points to the credentials.
648 * Deallocate and clear the cred->security field in a set of credentials.
649 * @cred_prepare:
650 * @new points to the new credentials.
651 * @old points to the original credentials.
652 * @gfp indicates the atomicity of any memory allocations.
653 * Prepare a new set of credentials by copying the data from the old set.
654 * @cred_transfer:
655 * @new points to the new credentials.
656 * @old points to the original credentials.
657 * Transfer data from original creds to new creds
658 * @kernel_act_as:
659 * Set the credentials for a kernel service to act as (subjective context).
660 * @new points to the credentials to be modified.
661 * @secid specifies the security ID to be set
662 * The current task must be the one that nominated @secid.
663 * Return 0 if successful.
664 * @kernel_create_files_as:
665 * Set the file creation context in a set of credentials to be the same as
666 * the objective context of the specified inode.
667 * @new points to the credentials to be modified.
668 * @inode points to the inode to use as a reference.
669 * The current task must be the one that nominated @inode.
670 * Return 0 if successful.
671 * @kernel_module_request:
672 * Ability to trigger the kernel to automatically upcall to userspace for
673 * userspace to load a kernel module with the given name.
674 * @kmod_name name of the module requested by the kernel
675 * Return 0 if successful.
676 * @task_fix_setuid:
677 * Update the module's state after setting one or more of the user
678 * identity attributes of the current process. The @flags parameter
679 * indicates which of the set*uid system calls invoked this hook. If
680 * @new is the set of credentials that will be installed. Modifications
681 * should be made to this rather than to @current->cred.
682 * @old is the set of credentials that are being replaces
683 * @flags contains one of the LSM_SETID_* values.
684 * Return 0 on success.
685 * @task_setpgid:
686 * Check permission before setting the process group identifier of the
687 * process @p to @pgid.
688 * @p contains the task_struct for process being modified.
689 * @pgid contains the new pgid.
690 * Return 0 if permission is granted.
691 * @task_getpgid:
692 * Check permission before getting the process group identifier of the
693 * process @p.
694 * @p contains the task_struct for the process.
695 * Return 0 if permission is granted.
696 * @task_getsid:
697 * Check permission before getting the session identifier of the process
698 * @p.
699 * @p contains the task_struct for the process.
700 * Return 0 if permission is granted.
701 * @task_getsecid:
702 * Retrieve the security identifier of the process @p.
703 * @p contains the task_struct for the process and place is into @secid.
704 * In case of failure, @secid will be set to zero.
705 *
706 * @task_setnice:
707 * Check permission before setting the nice value of @p to @nice.
708 * @p contains the task_struct of process.
709 * @nice contains the new nice value.
710 * Return 0 if permission is granted.
711 * @task_setioprio
712 * Check permission before setting the ioprio value of @p to @ioprio.
713 * @p contains the task_struct of process.
714 * @ioprio contains the new ioprio value
715 * Return 0 if permission is granted.
716 * @task_getioprio
717 * Check permission before getting the ioprio value of @p.
718 * @p contains the task_struct of process.
719 * Return 0 if permission is granted.
720 * @task_setrlimit:
721 * Check permission before setting the resource limits of the current
722 * process for @resource to @new_rlim. The old resource limit values can
723 * be examined by dereferencing (current->signal->rlim + resource).
724 * @resource contains the resource whose limit is being set.
725 * @new_rlim contains the new limits for @resource.
726 * Return 0 if permission is granted.
727 * @task_setscheduler:
728 * Check permission before setting scheduling policy and/or parameters of
729 * process @p based on @policy and @lp.
730 * @p contains the task_struct for process.
731 * @policy contains the scheduling policy.
732 * @lp contains the scheduling parameters.
733 * Return 0 if permission is granted.
734 * @task_getscheduler:
735 * Check permission before obtaining scheduling information for process
736 * @p.
737 * @p contains the task_struct for process.
738 * Return 0 if permission is granted.
739 * @task_movememory
740 * Check permission before moving memory owned by process @p.
741 * @p contains the task_struct for process.
742 * Return 0 if permission is granted.
743 * @task_kill:
744 * Check permission before sending signal @sig to @p. @info can be NULL,
745 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
746 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
747 * from the kernel and should typically be permitted.
748 * SIGIO signals are handled separately by the send_sigiotask hook in
749 * file_security_ops.
750 * @p contains the task_struct for process.
751 * @info contains the signal information.
752 * @sig contains the signal value.
753 * @secid contains the sid of the process where the signal originated
754 * Return 0 if permission is granted.
755 * @task_wait:
756 * Check permission before allowing a process to reap a child process @p
757 * and collect its status information.
758 * @p contains the task_struct for process.
759 * Return 0 if permission is granted.
760 * @task_prctl:
761 * Check permission before performing a process control operation on the
762 * current process.
763 * @option contains the operation.
764 * @arg2 contains a argument.
765 * @arg3 contains a argument.
766 * @arg4 contains a argument.
767 * @arg5 contains a argument.
768 * Return -ENOSYS if no-one wanted to handle this op, any other value to
769 * cause prctl() to return immediately with that value.
770 * @task_to_inode:
771 * Set the security attributes for an inode based on an associated task's
772 * security attributes, e.g. for /proc/pid inodes.
773 * @p contains the task_struct for the task.
774 * @inode contains the inode structure for the inode.
775 *
776 * Security hooks for Netlink messaging.
777 *
778 * @netlink_send:
779 * Save security information for a netlink message so that permission
780 * checking can be performed when the message is processed. The security
781 * information can be saved using the eff_cap field of the
782 * netlink_skb_parms structure. Also may be used to provide fine
783 * grained control over message transmission.
784 * @sk associated sock of task sending the message.,
785 * @skb contains the sk_buff structure for the netlink message.
786 * Return 0 if the information was successfully saved and message
787 * is allowed to be transmitted.
788 * @netlink_recv:
789 * Check permission before processing the received netlink message in
790 * @skb.
791 * @skb contains the sk_buff structure for the netlink message.
792 * @cap indicates the capability required
793 * Return 0 if permission is granted.
794 *
795 * Security hooks for Unix domain networking.
796 *
797 * @unix_stream_connect:
798 * Check permissions before establishing a Unix domain stream connection
799 * between @sock and @other.
800 * @sock contains the socket structure.
801 * @other contains the peer socket structure.
802 * Return 0 if permission is granted.
803 * @unix_may_send:
804 * Check permissions before connecting or sending datagrams from @sock to
805 * @other.
806 * @sock contains the socket structure.
807 * @sock contains the peer socket structure.
808 * Return 0 if permission is granted.
809 *
810 * The @unix_stream_connect and @unix_may_send hooks were necessary because
811 * Linux provides an alternative to the conventional file name space for Unix
812 * domain sockets. Whereas binding and connecting to sockets in the file name
813 * space is mediated by the typical file permissions (and caught by the mknod
814 * and permission hooks in inode_security_ops), binding and connecting to
815 * sockets in the abstract name space is completely unmediated. Sufficient
816 * control of Unix domain sockets in the abstract name space isn't possible
817 * using only the socket layer hooks, since we need to know the actual target
818 * socket, which is not looked up until we are inside the af_unix code.
819 *
820 * Security hooks for socket operations.
821 *
822 * @socket_create:
823 * Check permissions prior to creating a new socket.
824 * @family contains the requested protocol family.
825 * @type contains the requested communications type.
826 * @protocol contains the requested protocol.
827 * @kern set to 1 if a kernel socket.
828 * Return 0 if permission is granted.
829 * @socket_post_create:
830 * This hook allows a module to update or allocate a per-socket security
831 * structure. Note that the security field was not added directly to the
832 * socket structure, but rather, the socket security information is stored
833 * in the associated inode. Typically, the inode alloc_security hook will
834 * allocate and and attach security information to
835 * sock->inode->i_security. This hook may be used to update the
836 * sock->inode->i_security field with additional information that wasn't
837 * available when the inode was allocated.
838 * @sock contains the newly created socket structure.
839 * @family contains the requested protocol family.
840 * @type contains the requested communications type.
841 * @protocol contains the requested protocol.
842 * @kern set to 1 if a kernel socket.
843 * @socket_bind:
844 * Check permission before socket protocol layer bind operation is
845 * performed and the socket @sock is bound to the address specified in the
846 * @address parameter.
847 * @sock contains the socket structure.
848 * @address contains the address to bind to.
849 * @addrlen contains the length of address.
850 * Return 0 if permission is granted.
851 * @socket_connect:
852 * Check permission before socket protocol layer connect operation
853 * attempts to connect socket @sock to a remote address, @address.
854 * @sock contains the socket structure.
855 * @address contains the address of remote endpoint.
856 * @addrlen contains the length of address.
857 * Return 0 if permission is granted.
858 * @socket_listen:
859 * Check permission before socket protocol layer listen operation.
860 * @sock contains the socket structure.
861 * @backlog contains the maximum length for the pending connection queue.
862 * Return 0 if permission is granted.
863 * @socket_accept:
864 * Check permission before accepting a new connection. Note that the new
865 * socket, @newsock, has been created and some information copied to it,
866 * but the accept operation has not actually been performed.
867 * @sock contains the listening socket structure.
868 * @newsock contains the newly created server socket for connection.
869 * Return 0 if permission is granted.
870 * @socket_sendmsg:
871 * Check permission before transmitting a message to another socket.
872 * @sock contains the socket structure.
873 * @msg contains the message to be transmitted.
874 * @size contains the size of message.
875 * Return 0 if permission is granted.
876 * @socket_recvmsg:
877 * Check permission before receiving a message from a socket.
878 * @sock contains the socket structure.
879 * @msg contains the message structure.
880 * @size contains the size of message structure.
881 * @flags contains the operational flags.
882 * Return 0 if permission is granted.
883 * @socket_getsockname:
884 * Check permission before the local address (name) of the socket object
885 * @sock is retrieved.
886 * @sock contains the socket structure.
887 * Return 0 if permission is granted.
888 * @socket_getpeername:
889 * Check permission before the remote address (name) of a socket object
890 * @sock is retrieved.
891 * @sock contains the socket structure.
892 * Return 0 if permission is granted.
893 * @socket_getsockopt:
894 * Check permissions before retrieving the options associated with socket
895 * @sock.
896 * @sock contains the socket structure.
897 * @level contains the protocol level to retrieve option from.
898 * @optname contains the name of option to retrieve.
899 * Return 0 if permission is granted.
900 * @socket_setsockopt:
901 * Check permissions before setting the options associated with socket
902 * @sock.
903 * @sock contains the socket structure.
904 * @level contains the protocol level to set options for.
905 * @optname contains the name of the option to set.
906 * Return 0 if permission is granted.
907 * @socket_shutdown:
908 * Checks permission before all or part of a connection on the socket
909 * @sock is shut down.
910 * @sock contains the socket structure.
911 * @how contains the flag indicating how future sends and receives are handled.
912 * Return 0 if permission is granted.
913 * @socket_sock_rcv_skb:
914 * Check permissions on incoming network packets. This hook is distinct
915 * from Netfilter's IP input hooks since it is the first time that the
916 * incoming sk_buff @skb has been associated with a particular socket, @sk.
917 * Must not sleep inside this hook because some callers hold spinlocks.
918 * @sk contains the sock (not socket) associated with the incoming sk_buff.
919 * @skb contains the incoming network data.
920 * @socket_getpeersec_stream:
921 * This hook allows the security module to provide peer socket security
922 * state for unix or connected tcp sockets to userspace via getsockopt
923 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
924 * socket is associated with an ipsec SA.
925 * @sock is the local socket.
926 * @optval userspace memory where the security state is to be copied.
927 * @optlen userspace int where the module should copy the actual length
928 * of the security state.
929 * @len as input is the maximum length to copy to userspace provided
930 * by the caller.
931 * Return 0 if all is well, otherwise, typical getsockopt return
932 * values.
933 * @socket_getpeersec_dgram:
934 * This hook allows the security module to provide peer socket security
935 * state for udp sockets on a per-packet basis to userspace via
936 * getsockopt SO_GETPEERSEC. The application must first have indicated
937 * the IP_PASSSEC option via getsockopt. It can then retrieve the
938 * security state returned by this hook for a packet via the SCM_SECURITY
939 * ancillary message type.
940 * @skb is the skbuff for the packet being queried
941 * @secdata is a pointer to a buffer in which to copy the security data
942 * @seclen is the maximum length for @secdata
943 * Return 0 on success, error on failure.
944 * @sk_alloc_security:
945 * Allocate and attach a security structure to the sk->sk_security field,
946 * which is used to copy security attributes between local stream sockets.
947 * @sk_free_security:
948 * Deallocate security structure.
949 * @sk_clone_security:
950 * Clone/copy security structure.
951 * @sk_getsecid:
952 * Retrieve the LSM-specific secid for the sock to enable caching of network
953 * authorizations.
954 * @sock_graft:
955 * Sets the socket's isec sid to the sock's sid.
956 * @inet_conn_request:
957 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
958 * @inet_csk_clone:
959 * Sets the new child socket's sid to the openreq sid.
960 * @inet_conn_established:
961 * Sets the connection's peersid to the secmark on skb.
962 * @secmark_relabel_packet:
963 * check if the process should be allowed to relabel packets to the given secid
964 * @security_secmark_refcount_inc
965 * tells the LSM to increment the number of secmark labeling rules loaded
966 * @security_secmark_refcount_dec
967 * tells the LSM to decrement the number of secmark labeling rules loaded
968 * @req_classify_flow:
969 * Sets the flow's sid to the openreq sid.
970 * @tun_dev_create:
971 * Check permissions prior to creating a new TUN device.
972 * @tun_dev_post_create:
973 * This hook allows a module to update or allocate a per-socket security
974 * structure.
975 * @sk contains the newly created sock structure.
976 * @tun_dev_attach:
977 * Check permissions prior to attaching to a persistent TUN device. This
978 * hook can also be used by the module to update any security state
979 * associated with the TUN device's sock structure.
980 * @sk contains the existing sock structure.
981 *
982 * Security hooks for XFRM operations.
983 *
984 * @xfrm_policy_alloc_security:
985 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
986 * Database used by the XFRM system.
987 * @sec_ctx contains the security context information being provided by
988 * the user-level policy update program (e.g., setkey).
989 * Allocate a security structure to the xp->security field; the security
990 * field is initialized to NULL when the xfrm_policy is allocated.
991 * Return 0 if operation was successful (memory to allocate, legal context)
992 * @xfrm_policy_clone_security:
993 * @old_ctx contains an existing xfrm_sec_ctx.
994 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
995 * Allocate a security structure in new_ctxp that contains the
996 * information from the old_ctx structure.
997 * Return 0 if operation was successful (memory to allocate).
998 * @xfrm_policy_free_security:
999 * @ctx contains the xfrm_sec_ctx
1000 * Deallocate xp->security.
1001 * @xfrm_policy_delete_security:
1002 * @ctx contains the xfrm_sec_ctx.
1003 * Authorize deletion of xp->security.
1004 * @xfrm_state_alloc_security:
1005 * @x contains the xfrm_state being added to the Security Association
1006 * Database by the XFRM system.
1007 * @sec_ctx contains the security context information being provided by
1008 * the user-level SA generation program (e.g., setkey or racoon).
1009 * @secid contains the secid from which to take the mls portion of the context.
1010 * Allocate a security structure to the x->security field; the security
1011 * field is initialized to NULL when the xfrm_state is allocated. Set the
1012 * context to correspond to either sec_ctx or polsec, with the mls portion
1013 * taken from secid in the latter case.
1014 * Return 0 if operation was successful (memory to allocate, legal context).
1015 * @xfrm_state_free_security:
1016 * @x contains the xfrm_state.
1017 * Deallocate x->security.
1018 * @xfrm_state_delete_security:
1019 * @x contains the xfrm_state.
1020 * Authorize deletion of x->security.
1021 * @xfrm_policy_lookup:
1022 * @ctx contains the xfrm_sec_ctx for which the access control is being
1023 * checked.
1024 * @fl_secid contains the flow security label that is used to authorize
1025 * access to the policy xp.
1026 * @dir contains the direction of the flow (input or output).
1027 * Check permission when a flow selects a xfrm_policy for processing
1028 * XFRMs on a packet. The hook is called when selecting either a
1029 * per-socket policy or a generic xfrm policy.
1030 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1031 * on other errors.
1032 * @xfrm_state_pol_flow_match:
1033 * @x contains the state to match.
1034 * @xp contains the policy to check for a match.
1035 * @fl contains the flow to check for a match.
1036 * Return 1 if there is a match.
1037 * @xfrm_decode_session:
1038 * @skb points to skb to decode.
1039 * @secid points to the flow key secid to set.
1040 * @ckall says if all xfrms used should be checked for same secid.
1041 * Return 0 if ckall is zero or all xfrms used have the same secid.
1042 *
1043 * Security hooks affecting all Key Management operations
1044 *
1045 * @key_alloc:
1046 * Permit allocation of a key and assign security data. Note that key does
1047 * not have a serial number assigned at this point.
1048 * @key points to the key.
1049 * @flags is the allocation flags
1050 * Return 0 if permission is granted, -ve error otherwise.
1051 * @key_free:
1052 * Notification of destruction; free security data.
1053 * @key points to the key.
1054 * No return value.
1055 * @key_permission:
1056 * See whether a specific operational right is granted to a process on a
1057 * key.
1058 * @key_ref refers to the key (key pointer + possession attribute bit).
1059 * @cred points to the credentials to provide the context against which to
1060 * evaluate the security data on the key.
1061 * @perm describes the combination of permissions required of this key.
1062 * Return 1 if permission granted, 0 if permission denied and -ve it the
1063 * normal permissions model should be effected.
1064 * @key_getsecurity:
1065 * Get a textual representation of the security context attached to a key
1066 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1067 * allocates the storage for the NUL-terminated string and the caller
1068 * should free it.
1069 * @key points to the key to be queried.
1070 * @_buffer points to a pointer that should be set to point to the
1071 * resulting string (if no label or an error occurs).
1072 * Return the length of the string (including terminating NUL) or -ve if
1073 * an error.
1074 * May also return 0 (and a NULL buffer pointer) if there is no label.
1075 *
1076 * Security hooks affecting all System V IPC operations.
1077 *
1078 * @ipc_permission:
1079 * Check permissions for access to IPC
1080 * @ipcp contains the kernel IPC permission structure
1081 * @flag contains the desired (requested) permission set
1082 * Return 0 if permission is granted.
1083 * @ipc_getsecid:
1084 * Get the secid associated with the ipc object.
1085 * @ipcp contains the kernel IPC permission structure.
1086 * @secid contains a pointer to the location where result will be saved.
1087 * In case of failure, @secid will be set to zero.
1088 *
1089 * Security hooks for individual messages held in System V IPC message queues
1090 * @msg_msg_alloc_security:
1091 * Allocate and attach a security structure to the msg->security field.
1092 * The security field is initialized to NULL when the structure is first
1093 * created.
1094 * @msg contains the message structure to be modified.
1095 * Return 0 if operation was successful and permission is granted.
1096 * @msg_msg_free_security:
1097 * Deallocate the security structure for this message.
1098 * @msg contains the message structure to be modified.
1099 *
1100 * Security hooks for System V IPC Message Queues
1101 *
1102 * @msg_queue_alloc_security:
1103 * Allocate and attach a security structure to the
1104 * msq->q_perm.security field. The security field is initialized to
1105 * NULL when the structure is first created.
1106 * @msq contains the message queue structure to be modified.
1107 * Return 0 if operation was successful and permission is granted.
1108 * @msg_queue_free_security:
1109 * Deallocate security structure for this message queue.
1110 * @msq contains the message queue structure to be modified.
1111 * @msg_queue_associate:
1112 * Check permission when a message queue is requested through the
1113 * msgget system call. This hook is only called when returning the
1114 * message queue identifier for an existing message queue, not when a
1115 * new message queue is created.
1116 * @msq contains the message queue to act upon.
1117 * @msqflg contains the operation control flags.
1118 * Return 0 if permission is granted.
1119 * @msg_queue_msgctl:
1120 * Check permission when a message control operation specified by @cmd
1121 * is to be performed on the message queue @msq.
1122 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1123 * @msq contains the message queue to act upon. May be NULL.
1124 * @cmd contains the operation to be performed.
1125 * Return 0 if permission is granted.
1126 * @msg_queue_msgsnd:
1127 * Check permission before a message, @msg, is enqueued on the message
1128 * queue, @msq.
1129 * @msq contains the message queue to send message to.
1130 * @msg contains the message to be enqueued.
1131 * @msqflg contains operational flags.
1132 * Return 0 if permission is granted.
1133 * @msg_queue_msgrcv:
1134 * Check permission before a message, @msg, is removed from the message
1135 * queue, @msq. The @target task structure contains a pointer to the
1136 * process that will be receiving the message (not equal to the current
1137 * process when inline receives are being performed).
1138 * @msq contains the message queue to retrieve message from.
1139 * @msg contains the message destination.
1140 * @target contains the task structure for recipient process.
1141 * @type contains the type of message requested.
1142 * @mode contains the operational flags.
1143 * Return 0 if permission is granted.
1144 *
1145 * Security hooks for System V Shared Memory Segments
1146 *
1147 * @shm_alloc_security:
1148 * Allocate and attach a security structure to the shp->shm_perm.security
1149 * field. The security field is initialized to NULL when the structure is
1150 * first created.
1151 * @shp contains the shared memory structure to be modified.
1152 * Return 0 if operation was successful and permission is granted.
1153 * @shm_free_security:
1154 * Deallocate the security struct for this memory segment.
1155 * @shp contains the shared memory structure to be modified.
1156 * @shm_associate:
1157 * Check permission when a shared memory region is requested through the
1158 * shmget system call. This hook is only called when returning the shared
1159 * memory region identifier for an existing region, not when a new shared
1160 * memory region is created.
1161 * @shp contains the shared memory structure to be modified.
1162 * @shmflg contains the operation control flags.
1163 * Return 0 if permission is granted.
1164 * @shm_shmctl:
1165 * Check permission when a shared memory control operation specified by
1166 * @cmd is to be performed on the shared memory region @shp.
1167 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1168 * @shp contains shared memory structure to be modified.
1169 * @cmd contains the operation to be performed.
1170 * Return 0 if permission is granted.
1171 * @shm_shmat:
1172 * Check permissions prior to allowing the shmat system call to attach the
1173 * shared memory segment @shp to the data segment of the calling process.
1174 * The attaching address is specified by @shmaddr.
1175 * @shp contains the shared memory structure to be modified.
1176 * @shmaddr contains the address to attach memory region to.
1177 * @shmflg contains the operational flags.
1178 * Return 0 if permission is granted.
1179 *
1180 * Security hooks for System V Semaphores
1181 *
1182 * @sem_alloc_security:
1183 * Allocate and attach a security structure to the sma->sem_perm.security
1184 * field. The security field is initialized to NULL when the structure is
1185 * first created.
1186 * @sma contains the semaphore structure
1187 * Return 0 if operation was successful and permission is granted.
1188 * @sem_free_security:
1189 * deallocate security struct for this semaphore
1190 * @sma contains the semaphore structure.
1191 * @sem_associate:
1192 * Check permission when a semaphore is requested through the semget
1193 * system call. This hook is only called when returning the semaphore
1194 * identifier for an existing semaphore, not when a new one must be
1195 * created.
1196 * @sma contains the semaphore structure.
1197 * @semflg contains the operation control flags.
1198 * Return 0 if permission is granted.
1199 * @sem_semctl:
1200 * Check permission when a semaphore operation specified by @cmd is to be
1201 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1202 * IPC_INFO or SEM_INFO.
1203 * @sma contains the semaphore structure. May be NULL.
1204 * @cmd contains the operation to be performed.
1205 * Return 0 if permission is granted.
1206 * @sem_semop
1207 * Check permissions before performing operations on members of the
1208 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1209 * may be modified.
1210 * @sma contains the semaphore structure.
1211 * @sops contains the operations to perform.
1212 * @nsops contains the number of operations to perform.
1213 * @alter contains the flag indicating whether changes are to be made.
1214 * Return 0 if permission is granted.
1215 *
1216 * @ptrace_access_check:
1217 * Check permission before allowing the current process to trace the
1218 * @child process.
1219 * Security modules may also want to perform a process tracing check
1220 * during an execve in the set_security or apply_creds hooks of
1221 * tracing check during an execve in the bprm_set_creds hook of
1222 * binprm_security_ops if the process is being traced and its security
1223 * attributes would be changed by the execve.
1224 * @child contains the task_struct structure for the target process.
1225 * @mode contains the PTRACE_MODE flags indicating the form of access.
1226 * Return 0 if permission is granted.
1227 * @ptrace_traceme:
1228 * Check that the @parent process has sufficient permission to trace the
1229 * current process before allowing the current process to present itself
1230 * to the @parent process for tracing.
1231 * The parent process will still have to undergo the ptrace_access_check
1232 * checks before it is allowed to trace this one.
1233 * @parent contains the task_struct structure for debugger process.
1234 * Return 0 if permission is granted.
1235 * @capget:
1236 * Get the @effective, @inheritable, and @permitted capability sets for
1237 * the @target process. The hook may also perform permission checking to
1238 * determine if the current process is allowed to see the capability sets
1239 * of the @target process.
1240 * @target contains the task_struct structure for target process.
1241 * @effective contains the effective capability set.
1242 * @inheritable contains the inheritable capability set.
1243 * @permitted contains the permitted capability set.
1244 * Return 0 if the capability sets were successfully obtained.
1245 * @capset:
1246 * Set the @effective, @inheritable, and @permitted capability sets for
1247 * the current process.
1248 * @new contains the new credentials structure for target process.
1249 * @old contains the current credentials structure for target process.
1250 * @effective contains the effective capability set.
1251 * @inheritable contains the inheritable capability set.
1252 * @permitted contains the permitted capability set.
1253 * Return 0 and update @new if permission is granted.
1254 * @capable:
1255 * Check whether the @tsk process has the @cap capability in the indicated
1256 * credentials.
1257 * @tsk contains the task_struct for the process.
1258 * @cred contains the credentials to use.
1259 * @cap contains the capability <include/linux/capability.h>.
1260 * @audit: Whether to write an audit message or not
1261 * Return 0 if the capability is granted for @tsk.
1262 * @sysctl:
1263 * Check permission before accessing the @table sysctl variable in the
1264 * manner specified by @op.
1265 * @table contains the ctl_table structure for the sysctl variable.
1266 * @op contains the operation (001 = search, 002 = write, 004 = read).
1267 * Return 0 if permission is granted.
1268 * @syslog:
1269 * Check permission before accessing the kernel message ring or changing
1270 * logging to the console.
1271 * See the syslog(2) manual page for an explanation of the @type values.
1272 * @type contains the type of action.
1273 * @from_file indicates the context of action (if it came from /proc).
1274 * Return 0 if permission is granted.
1275 * @settime:
1276 * Check permission to change the system time.
1277 * struct timespec and timezone are defined in include/linux/time.h
1278 * @ts contains new time
1279 * @tz contains new timezone
1280 * Return 0 if permission is granted.
1281 * @vm_enough_memory:
1282 * Check permissions for allocating a new virtual mapping.
1283 * @mm contains the mm struct it is being added to.
1284 * @pages contains the number of pages.
1285 * Return 0 if permission is granted.
1286 *
1287 * @secid_to_secctx:
1288 * Convert secid to security context. If secdata is NULL the length of
1289 * the result will be returned in seclen, but no secdata will be returned.
1290 * This does mean that the length could change between calls to check the
1291 * length and the next call which actually allocates and returns the secdata.
1292 * @secid contains the security ID.
1293 * @secdata contains the pointer that stores the converted security context.
1294 * @seclen pointer which contains the length of the data
1295 * @secctx_to_secid:
1296 * Convert security context to secid.
1297 * @secid contains the pointer to the generated security ID.
1298 * @secdata contains the security context.
1299 *
1300 * @release_secctx:
1301 * Release the security context.
1302 * @secdata contains the security context.
1303 * @seclen contains the length of the security context.
1304 *
1305 * Security hooks for Audit
1306 *
1307 * @audit_rule_init:
1308 * Allocate and initialize an LSM audit rule structure.
1309 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1310 * @op contains the operator the rule uses.
1311 * @rulestr contains the context where the rule will be applied to.
1312 * @lsmrule contains a pointer to receive the result.
1313 * Return 0 if @lsmrule has been successfully set,
1314 * -EINVAL in case of an invalid rule.
1315 *
1316 * @audit_rule_known:
1317 * Specifies whether given @rule contains any fields related to current LSM.
1318 * @rule contains the audit rule of interest.
1319 * Return 1 in case of relation found, 0 otherwise.
1320 *
1321 * @audit_rule_match:
1322 * Determine if given @secid matches a rule previously approved
1323 * by @audit_rule_known.
1324 * @secid contains the security id in question.
1325 * @field contains the field which relates to current LSM.
1326 * @op contains the operator that will be used for matching.
1327 * @rule points to the audit rule that will be checked against.
1328 * @actx points to the audit context associated with the check.
1329 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1330 *
1331 * @audit_rule_free:
1332 * Deallocate the LSM audit rule structure previously allocated by
1333 * audit_rule_init.
1334 * @rule contains the allocated rule
1335 *
1336 * @inode_notifysecctx:
1337 * Notify the security module of what the security context of an inode
1338 * should be. Initializes the incore security context managed by the
1339 * security module for this inode. Example usage: NFS client invokes
1340 * this hook to initialize the security context in its incore inode to the
1341 * value provided by the server for the file when the server returned the
1342 * file's attributes to the client.
1343 *
1344 * Must be called with inode->i_mutex locked.
1345 *
1346 * @inode we wish to set the security context of.
1347 * @ctx contains the string which we wish to set in the inode.
1348 * @ctxlen contains the length of @ctx.
1349 *
1350 * @inode_setsecctx:
1351 * Change the security context of an inode. Updates the
1352 * incore security context managed by the security module and invokes the
1353 * fs code as needed (via __vfs_setxattr_noperm) to update any backing
1354 * xattrs that represent the context. Example usage: NFS server invokes
1355 * this hook to change the security context in its incore inode and on the
1356 * backing filesystem to a value provided by the client on a SETATTR
1357 * operation.
1358 *
1359 * Must be called with inode->i_mutex locked.
1360 *
1361 * @dentry contains the inode we wish to set the security context of.
1362 * @ctx contains the string which we wish to set in the inode.
1363 * @ctxlen contains the length of @ctx.
1364 *
1365 * @inode_getsecctx:
1366 * Returns a string containing all relavent security context information
1367 *
1368 * @inode we wish to set the security context of.
1369 * @ctx is a pointer in which to place the allocated security context.
1370 * @ctxlen points to the place to put the length of @ctx.
1371 * This is the main security structure.
1372 */
1418 #ifdef CONFIG_SECURITY_PATH
1432 mode_t mode);
1435 #endif
1468 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1469 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1498 gfp_t gfp);
1571 #ifdef CONFIG_SECURITY_NETWORK
1595 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1615 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1618 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1623 u32 secid);
1633 /* key management security hooks */
1634 #ifdef CONFIG_KEYS
1639 key_perm_t perm);
1643 #ifdef CONFIG_AUDIT
1650 };
1652 /* prototypes */
1657 /* Security operations */
1728 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1729 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1813 };
1816 {
1817 }
1820 {
1821 }
1823 /*
1824 * This is the default capabilities functionality. Most of these functions
1825 * are just stubbed out, but a few must call the proper capable code.
1826 */
1829 {
1831 }
1835 {
1837 }
1840 {
1842 }
1848 {
1850 }
1857 {
1859 }
1862 {
1864 }
1867 {
1874 }
1878 {
1883 SECURITY_CAP_NOAUDIT);
1886 }
1889 {
1891 }
1895 {
1897 }
1900 {
1902 }
1905 {
1907 }
1910 {
1912 }
1915 {
1918 }
1921 {
1924 }
1927 {
1928 /* If current->mm is a kernel thread then we will pass NULL,
1929 for this specific case that is fine */
1931 }
1934 {
1936 }
1939 {
1941 }
1944 {
1945 }
1948 {
1949 }
1952 {
1954 }
1957 {
1959 }
1962 { }
1965 {
1967 }
1970 {
1972 }
1976 {
1978 }
1981 {
1983 }
1988 {
1990 }
1993 {
1995 }
1999 {
2001 }
2005 {
2007 }
2011 { }
2014 {
2016 }
2019 {
2021 }
2024 { }
2031 {
2033 }
2038 {
2040 }
2045 {
2047 }
2051 {
2053 }
2058 {
2060 }
2065 {
2067 }
2071 {
2073 }
2078 {
2080 }
2086 {
2088 }
2091 {
2093 }
2097 {
2099 }
2102 {
2104 }
2108 {
2110 }
2114 {
2116 }
2120 {
2122 }
2126 { }
2130 {
2132 }
2135 {
2137 }
2141 {
2143 }
2146 {
2148 }
2151 {
2153 }
2155 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2156 {
2158 }
2160 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2161 {
2163 }
2165 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2166 {
2168 }
2171 {
2173 }
2176 {
2178 }
2181 {
2183 }
2186 { }
2190 {
2192 }
2199 {
2201 }
2206 {
2208 }
2211 {
2213 }
2217 {
2219 }
2222 {
2224 }
2229 {
2231 }
2234 {
2236 }
2240 {
2242 }
2245 {
2247 }
2250 {
2252 }
2255 { }
2259 gfp_t gfp)
2260 {
2262 }
2266 {
2267 }
2270 {
2272 }
2276 {
2278 }
2281 {
2283 }
2288 {
2290 }
2293 {
2295 }
2298 {
2300 }
2303 {
2305 }
2308 {
2310 }
2313 {
2315 }
2318 {
2320 }
2323 {
2325 }
2330 {
2332 }
2335 {
2337 }
2340 {
2342 }
2345 {
2347 }
2351 u32 secid)
2352 {
2354 }
2357 {
2359 }
2365 {
2367 }
2370 { }
2374 {
2376 }
2379 {
2381 }
2384 {
2386 }
2389 { }
2392 {
2394 }
2397 { }
2401 {
2403 }
2406 {
2408 }
2412 {
2414 }
2420 {
2422 }
2425 {
2427 }
2430 { }
2434 {
2436 }
2439 {
2441 }
2445 {
2447 }
2450 {
2452 }
2455 { }
2458 {
2460 }
2463 {
2465 }
2470 {
2472 }
2475 { }
2478 {
2480 }
2482 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2483 {
2485 }
2488 {
2490 }
2493 {
2495 }
2498 {
2500 }
2503 u32 seclen,
2505 {
2507 }
2510 {
2511 }
2514 {
2516 }
2518 {
2520 }
2522 {
2524 }
2527 #ifdef CONFIG_SECURITY_NETWORK
2574 {
2576 }
2580 {
2582 }
2586 {
2588 }
2594 {
2596 }
2601 {
2603 }
2608 {
2610 }
2613 {
2615 }
2619 {
2621 }
2625 {
2627 }
2632 {
2634 }
2637 {
2639 }
2642 {
2644 }
2648 {
2650 }
2654 {
2656 }
2659 {
2661 }
2664 {
2666 }
2670 {
2672 }
2674 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2675 {
2677 }
2680 {
2682 }
2685 {
2686 }
2689 {
2690 }
2693 {
2694 }
2696 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2697 {
2698 }
2701 {
2702 }
2706 {
2708 }
2712 {
2713 }
2717 {
2718 }
2721 {
2723 }
2726 {
2727 }
2730 {
2731 }
2734 {
2736 }
2739 {
2740 }
2743 {
2745 }
2748 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2767 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2768 {
2770 }
2772 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2773 {
2775 }
2778 {
2779 }
2782 {
2784 }
2788 {
2790 }
2794 {
2796 }
2799 {
2800 }
2803 {
2805 }
2808 {
2810 }
2814 {
2816 }
2819 {
2821 }
2824 {
2825 }
2829 #ifdef CONFIG_SECURITY_PATH
2843 mode_t mode);
2848 {
2850 }
2854 {
2856 }
2859 {
2861 }
2865 {
2867 }
2870 {
2872 }
2876 {
2878 }
2883 {
2885 }
2891 {
2893 }
2897 mode_t mode)
2898 {
2900 }
2903 {
2905 }
2908 {
2910 }
2913 #ifdef CONFIG_KEYS
2914 #ifdef CONFIG_SECURITY
2922 #else
2927 {
2929 }
2932 {
2933 }
2937 key_perm_t perm)
2938 {
2940 }
2943 {
2946 }
2948 #endif
2951 #ifdef CONFIG_AUDIT
2952 #ifdef CONFIG_SECURITY
2959 #else
2963 {
2965 }
2968 {
2970 }
2974 {
2976 }
2979 { }
2984 #ifdef CONFIG_SECURITYFS
2996 {
2998 }
3001 mode_t mode,
3005 {
3007 }
3010 {}
3012 #endif
3014 #ifdef CONFIG_SECURITY
3017 {
3019 }
3022 {
3024 }
3026 #else
3029 {
3031 }
3034 { }