| blob | d5fd6163606fa028f7db538825cc055a051e0d51 |
1 /*
2 * Linux Security plug
3 *
4 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
5 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
7 * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
8 * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * Due to this file being licensed under the GPL there is controversy over
16 * whether this permits you to write a module that #includes this file
17 * without placing your module under the GPL. Please consult a lawyer for
18 * advice before doing this.
19 *
20 */
22 #ifndef __LINUX_SECURITY_H
23 #define __LINUX_SECURITY_H
25 #include <linux/fs.h>
26 #include <linux/binfmts.h>
27 #include <linux/signal.h>
28 #include <linux/resource.h>
29 #include <linux/sem.h>
30 #include <linux/shm.h>
31 #include <linux/msg.h>
32 #include <linux/sched.h>
33 #include <linux/key.h>
34 #include <linux/xfrm.h>
35 #include <linux/gfp.h>
36 #include <net/flow.h>
38 /* Maximum number of letters for an LSM name string */
39 #define SECURITY_NAME_MAX 10
41 /* If capable should audit the security request */
42 #define SECURITY_CAP_NOAUDIT 0
43 #define SECURITY_CAP_AUDIT 1
48 /*
49 * These functions are in security/capability.c and are used
50 * as the default capabilities functions
51 */
57 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
95 /*
96 * Values used in the task_security_ops calls
97 */
98 /* setuid or setgid, id0 == uid or gid */
99 #define LSM_SETID_ID 1
101 /* setreuid or setregid, id0 == real, id1 == eff */
102 #define LSM_SETID_RE 2
104 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
105 #define LSM_SETID_RES 4
107 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
108 #define LSM_SETID_FS 8
110 /* forward declares to avoid warnings */
114 /* bprm->unsafe reasons */
115 #define LSM_UNSAFE_SHARE 1
116 #define LSM_UNSAFE_PTRACE 2
117 #define LSM_UNSAFE_PTRACE_CAP 4
119 #ifdef CONFIG_SECURITY
125 };
128 {
132 }
135 {
145 }
147 /**
148 * struct security_operations - main security structure
149 *
150 * Security module identifier.
151 *
152 * @name:
153 * A string that acts as a unique identifeir for the LSM with max number
154 * of characters = SECURITY_NAME_MAX.
155 *
156 * Security hooks for program execution operations.
157 *
158 * @bprm_set_creds:
159 * Save security information in the bprm->security field, typically based
160 * on information about the bprm->file, for later use by the apply_creds
161 * hook. This hook may also optionally check permissions (e.g. for
162 * transitions between security domains).
163 * This hook may be called multiple times during a single execve, e.g. for
164 * interpreters. The hook can tell whether it has already been called by
165 * checking to see if @bprm->security is non-NULL. If so, then the hook
166 * may decide either to retain the security information saved earlier or
167 * to replace it.
168 * @bprm contains the linux_binprm structure.
169 * Return 0 if the hook is successful and permission is granted.
170 * @bprm_check_security:
171 * This hook mediates the point when a search for a binary handler will
172 * begin. It allows a check the @bprm->security value which is set in the
173 * preceding set_creds call. The primary difference from set_creds is
174 * that the argv list and envp list are reliably available in @bprm. This
175 * hook may be called multiple times during a single execve; and in each
176 * pass set_creds is called first.
177 * @bprm contains the linux_binprm structure.
178 * Return 0 if the hook is successful and permission is granted.
179 * @bprm_committing_creds:
180 * Prepare to install the new security attributes of a process being
181 * transformed by an execve operation, based on the old credentials
182 * pointed to by @current->cred and the information set in @bprm->cred by
183 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
184 * This hook is a good place to perform state changes on the process such
185 * as closing open file descriptors to which access will no longer be
186 * granted when the attributes are changed. This is called immediately
187 * before commit_creds().
188 * @bprm_committed_creds:
189 * Tidy up after the installation of the new security attributes of a
190 * process being transformed by an execve operation. The new credentials
191 * have, by this point, been set to @current->cred. @bprm points to the
192 * linux_binprm structure. This hook is a good place to perform state
193 * changes on the process such as clearing out non-inheritable signal
194 * state. This is called immediately after commit_creds().
195 * @bprm_secureexec:
196 * Return a boolean value (0 or 1) indicating whether a "secure exec"
197 * is required. The flag is passed in the auxiliary table
198 * on the initial stack to the ELF interpreter to indicate whether libc
199 * should enable secure mode.
200 * @bprm contains the linux_binprm structure.
201 *
202 * Security hooks for filesystem operations.
203 *
204 * @sb_alloc_security:
205 * Allocate and attach a security structure to the sb->s_security field.
206 * The s_security field is initialized to NULL when the structure is
207 * allocated.
208 * @sb contains the super_block structure to be modified.
209 * Return 0 if operation was successful.
210 * @sb_free_security:
211 * Deallocate and clear the sb->s_security field.
212 * @sb contains the super_block structure to be modified.
213 * @sb_statfs:
214 * Check permission before obtaining filesystem statistics for the @mnt
215 * mountpoint.
216 * @dentry is a handle on the superblock for the filesystem.
217 * Return 0 if permission is granted.
218 * @sb_mount:
219 * Check permission before an object specified by @dev_name is mounted on
220 * the mount point named by @nd. For an ordinary mount, @dev_name
221 * identifies a device if the file system type requires a device. For a
222 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
223 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
224 * pathname of the object being mounted.
225 * @dev_name contains the name for object being mounted.
226 * @path contains the path for mount point object.
227 * @type contains the filesystem type.
228 * @flags contains the mount flags.
229 * @data contains the filesystem-specific data.
230 * Return 0 if permission is granted.
231 * @sb_copy_data:
232 * Allow mount option data to be copied prior to parsing by the filesystem,
233 * so that the security module can extract security-specific mount
234 * options cleanly (a filesystem may modify the data e.g. with strsep()).
235 * This also allows the original mount data to be stripped of security-
236 * specific options to avoid having to make filesystems aware of them.
237 * @type the type of filesystem being mounted.
238 * @orig the original mount data copied from userspace.
239 * @copy copied data which will be passed to the security module.
240 * Returns 0 if the copy was successful.
241 * @sb_check_sb:
242 * Check permission before the device with superblock @mnt->sb is mounted
243 * on the mount point named by @nd.
244 * @mnt contains the vfsmount for device being mounted.
245 * @path contains the path for the mount point.
246 * Return 0 if permission is granted.
247 * @sb_umount:
248 * Check permission before the @mnt file system is unmounted.
249 * @mnt contains the mounted file system.
250 * @flags contains the unmount flags, e.g. MNT_FORCE.
251 * Return 0 if permission is granted.
252 * @sb_umount_close:
253 * Close any files in the @mnt mounted filesystem that are held open by
254 * the security module. This hook is called during an umount operation
255 * prior to checking whether the filesystem is still busy.
256 * @mnt contains the mounted filesystem.
257 * @sb_umount_busy:
258 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
259 * any files that were closed by umount_close. This hook is called during
260 * an umount operation if the umount fails after a call to the
261 * umount_close hook.
262 * @mnt contains the mounted filesystem.
263 * @sb_post_remount:
264 * Update the security module's state when a filesystem is remounted.
265 * This hook is only called if the remount was successful.
266 * @mnt contains the mounted file system.
267 * @flags contains the new filesystem flags.
268 * @data contains the filesystem-specific data.
269 * @sb_post_addmount:
270 * Update the security module's state when a filesystem is mounted.
271 * This hook is called any time a mount is successfully grafetd to
272 * the tree.
273 * @mnt contains the mounted filesystem.
274 * @mountpoint contains the path for the mount point.
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_post_pivotroot:
281 * Update module state after a successful pivot.
282 * @old_path contains the path for the old root.
283 * @new_path contains the path for the new root.
284 * @sb_set_mnt_opts:
285 * Set the security relevant mount options used for a superblock
286 * @sb the superblock to set security mount options for
287 * @opts binary data structure containing all lsm mount data
288 * @sb_clone_mnt_opts:
289 * Copy all security options from a given superblock to another
290 * @oldsb old superblock which contain information to clone
291 * @newsb new superblock which needs filled in
292 * @sb_parse_opts_str:
293 * Parse a string of security data filling in the opts structure
294 * @options string containing all mount options known by the LSM
295 * @opts binary data structure usable by the LSM
296 *
297 * Security hooks for inode operations.
298 *
299 * @inode_alloc_security:
300 * Allocate and attach a security structure to @inode->i_security. The
301 * i_security field is initialized to NULL when the inode structure is
302 * allocated.
303 * @inode contains the inode structure.
304 * Return 0 if operation was successful.
305 * @inode_free_security:
306 * @inode contains the inode structure.
307 * Deallocate the inode security structure and set @inode->i_security to
308 * NULL.
309 * @inode_init_security:
310 * Obtain the security attribute name suffix and value to set on a newly
311 * created inode and set up the incore security field for the new inode.
312 * This hook is called by the fs code as part of the inode creation
313 * transaction and provides for atomic labeling of the inode, unlike
314 * the post_create/mkdir/... hooks called by the VFS. The hook function
315 * is expected to allocate the name and value via kmalloc, with the caller
316 * being responsible for calling kfree after using them.
317 * If the security module does not use security attributes or does
318 * not wish to put a security attribute on this particular inode,
319 * then it should return -EOPNOTSUPP to skip this processing.
320 * @inode contains the inode structure of the newly created inode.
321 * @dir contains the inode structure of the parent directory.
322 * @name will be set to the allocated name suffix (e.g. selinux).
323 * @value will be set to the allocated attribute value.
324 * @len will be set to the length of the value.
325 * Returns 0 if @name and @value have been successfully set,
326 * -EOPNOTSUPP if no security attribute is needed, or
327 * -ENOMEM on memory allocation failure.
328 * @inode_create:
329 * Check permission to create a regular file.
330 * @dir contains inode structure of the parent of the new file.
331 * @dentry contains the dentry structure for the file to be created.
332 * @mode contains the file mode of the file to be created.
333 * Return 0 if permission is granted.
334 * @inode_link:
335 * Check permission before creating a new hard link to a file.
336 * @old_dentry contains the dentry structure for an existing link to the file.
337 * @dir contains the inode structure of the parent directory of the new link.
338 * @new_dentry contains the dentry structure for the new link.
339 * Return 0 if permission is granted.
340 * @path_link:
341 * Check permission before creating a new hard link to a file.
342 * @old_dentry contains the dentry structure for an existing link
343 * to the file.
344 * @new_dir contains the path structure of the parent directory of
345 * the new link.
346 * @new_dentry contains the dentry structure for the new link.
347 * Return 0 if permission is granted.
348 * @inode_unlink:
349 * Check the permission to remove a hard link to a file.
350 * @dir contains the inode structure of parent directory of the file.
351 * @dentry contains the dentry structure for file to be unlinked.
352 * Return 0 if permission is granted.
353 * @path_unlink:
354 * Check the permission to remove a hard link to a file.
355 * @dir contains the path structure of parent directory of the file.
356 * @dentry contains the dentry structure for file to be unlinked.
357 * Return 0 if permission is granted.
358 * @inode_symlink:
359 * Check the permission to create a symbolic link to a file.
360 * @dir contains the inode structure of parent directory of the symbolic link.
361 * @dentry contains the dentry structure of the symbolic link.
362 * @old_name contains the pathname of file.
363 * Return 0 if permission is granted.
364 * @path_symlink:
365 * Check the permission to create a symbolic link to a file.
366 * @dir contains the path structure of parent directory of
367 * the symbolic link.
368 * @dentry contains the dentry structure of the symbolic link.
369 * @old_name contains the pathname of file.
370 * Return 0 if permission is granted.
371 * @inode_mkdir:
372 * Check permissions to create a new directory in the existing directory
373 * associated with inode strcture @dir.
374 * @dir containst the inode structure of parent of the directory to be created.
375 * @dentry contains the dentry structure of new directory.
376 * @mode contains the mode of new directory.
377 * Return 0 if permission is granted.
378 * @path_mkdir:
379 * Check permissions to create a new directory in the existing directory
380 * associated with path strcture @path.
381 * @dir containst the path structure of parent of the directory
382 * to be created.
383 * @dentry contains the dentry structure of new directory.
384 * @mode contains the mode of new directory.
385 * Return 0 if permission is granted.
386 * @inode_rmdir:
387 * Check the permission to remove a directory.
388 * @dir contains the inode structure of parent of the directory to be removed.
389 * @dentry contains the dentry structure of directory to be removed.
390 * Return 0 if permission is granted.
391 * @path_rmdir:
392 * Check the permission to remove a directory.
393 * @dir contains the path structure of parent of the directory to be
394 * removed.
395 * @dentry contains the dentry structure of directory to be removed.
396 * Return 0 if permission is granted.
397 * @inode_mknod:
398 * Check permissions when creating a special file (or a socket or a fifo
399 * file created via the mknod system call). Note that if mknod operation
400 * is being done for a regular file, then the create hook will be called
401 * and not this hook.
402 * @dir contains the inode structure of parent of the new file.
403 * @dentry contains the dentry structure of the new file.
404 * @mode contains the mode of the new file.
405 * @dev contains the device number.
406 * Return 0 if permission is granted.
407 * @path_mknod:
408 * Check permissions when creating a file. Note that this hook is called
409 * even if mknod operation is being done for a regular file.
410 * @dir contains the path structure of parent of the new file.
411 * @dentry contains the dentry structure of the new file.
412 * @mode contains the mode of the new file.
413 * @dev contains the undecoded device number. Use new_decode_dev() to get
414 * the decoded device number.
415 * Return 0 if permission is granted.
416 * @inode_rename:
417 * Check for permission to rename a file or directory.
418 * @old_dir contains the inode structure for parent of the old link.
419 * @old_dentry contains the dentry structure of the old link.
420 * @new_dir contains the inode structure for parent of the new link.
421 * @new_dentry contains the dentry structure of the new link.
422 * Return 0 if permission is granted.
423 * @path_rename:
424 * Check for permission to rename a file or directory.
425 * @old_dir contains the path structure for parent of the old link.
426 * @old_dentry contains the dentry structure of the old link.
427 * @new_dir contains the path structure for parent of the new link.
428 * @new_dentry contains the dentry structure of the new link.
429 * Return 0 if permission is granted.
430 * @inode_readlink:
431 * Check the permission to read the symbolic link.
432 * @dentry contains the dentry structure for the file link.
433 * Return 0 if permission is granted.
434 * @inode_follow_link:
435 * Check permission to follow a symbolic link when looking up a pathname.
436 * @dentry contains the dentry structure for the link.
437 * @nd contains the nameidata structure for the parent directory.
438 * Return 0 if permission is granted.
439 * @inode_permission:
440 * Check permission before accessing an inode. This hook is called by the
441 * existing Linux permission function, so a security module can use it to
442 * provide additional checking for existing Linux permission checks.
443 * Notice that this hook is called when a file is opened (as well as many
444 * other operations), whereas the file_security_ops permission hook is
445 * called when the actual read/write operations are performed.
446 * @inode contains the inode structure to check.
447 * @mask contains the permission mask.
448 * @nd contains the nameidata (may be NULL).
449 * Return 0 if permission is granted.
450 * @inode_setattr:
451 * Check permission before setting file attributes. Note that the kernel
452 * call to notify_change is performed from several locations, whenever
453 * file attributes change (such as when a file is truncated, chown/chmod
454 * operations, transferring disk quotas, etc).
455 * @dentry contains the dentry structure for the file.
456 * @attr is the iattr structure containing the new file attributes.
457 * Return 0 if permission is granted.
458 * @path_truncate:
459 * Check permission before truncating a file.
460 * @path contains the path structure for the file.
461 * @length is the new length of the file.
462 * @time_attrs is the flags passed to do_truncate().
463 * Return 0 if permission is granted.
464 * @inode_getattr:
465 * Check permission before obtaining file attributes.
466 * @mnt is the vfsmount where the dentry was looked up
467 * @dentry contains the dentry structure for the file.
468 * Return 0 if permission is granted.
469 * @inode_delete:
470 * @inode contains the inode structure for deleted inode.
471 * This hook is called when a deleted inode is released (i.e. an inode
472 * with no hard links has its use count drop to zero). A security module
473 * can use this hook to release any persistent label associated with the
474 * inode.
475 * @inode_setxattr:
476 * Check permission before setting the extended attributes
477 * @value identified by @name for @dentry.
478 * Return 0 if permission is granted.
479 * @inode_post_setxattr:
480 * Update inode security field after successful setxattr operation.
481 * @value identified by @name for @dentry.
482 * @inode_getxattr:
483 * Check permission before obtaining the extended attributes
484 * identified by @name for @dentry.
485 * Return 0 if permission is granted.
486 * @inode_listxattr:
487 * Check permission before obtaining the list of extended attribute
488 * names for @dentry.
489 * Return 0 if permission is granted.
490 * @inode_removexattr:
491 * Check permission before removing the extended attribute
492 * identified by @name for @dentry.
493 * Return 0 if permission is granted.
494 * @inode_getsecurity:
495 * Retrieve a copy of the extended attribute representation of the
496 * security label associated with @name for @inode via @buffer. Note that
497 * @name is the remainder of the attribute name after the security prefix
498 * has been removed. @alloc is used to specify of the call should return a
499 * value via the buffer or just the value length Return size of buffer on
500 * success.
501 * @inode_setsecurity:
502 * Set the security label associated with @name for @inode from the
503 * extended attribute value @value. @size indicates the size of the
504 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
505 * Note that @name is the remainder of the attribute name after the
506 * security. prefix has been removed.
507 * Return 0 on success.
508 * @inode_listsecurity:
509 * Copy the extended attribute names for the security labels
510 * associated with @inode into @buffer. The maximum size of @buffer
511 * is specified by @buffer_size. @buffer may be NULL to request
512 * the size of the buffer required.
513 * Returns number of bytes used/required on success.
514 * @inode_need_killpriv:
515 * Called when an inode has been changed.
516 * @dentry is the dentry being changed.
517 * Return <0 on error to abort the inode change operation.
518 * Return 0 if inode_killpriv does not need to be called.
519 * Return >0 if inode_killpriv does need to be called.
520 * @inode_killpriv:
521 * The setuid bit is being removed. Remove similar security labels.
522 * Called with the dentry->d_inode->i_mutex held.
523 * @dentry is the dentry being changed.
524 * Return 0 on success. If error is returned, then the operation
525 * causing setuid bit removal is failed.
526 * @inode_getsecid:
527 * Get the secid associated with the node.
528 * @inode contains a pointer to the inode.
529 * @secid contains a pointer to the location where result will be saved.
530 * In case of failure, @secid will be set to zero.
531 *
532 * Security hooks for file operations
533 *
534 * @file_permission:
535 * Check file permissions before accessing an open file. This hook is
536 * called by various operations that read or write files. A security
537 * module can use this hook to perform additional checking on these
538 * operations, e.g. to revalidate permissions on use to support privilege
539 * bracketing or policy changes. Notice that this hook is used when the
540 * actual read/write operations are performed, whereas the
541 * inode_security_ops hook is called when a file is opened (as well as
542 * many other operations).
543 * Caveat: Although this hook can be used to revalidate permissions for
544 * various system call operations that read or write files, it does not
545 * address the revalidation of permissions for memory-mapped files.
546 * Security modules must handle this separately if they need such
547 * revalidation.
548 * @file contains the file structure being accessed.
549 * @mask contains the requested permissions.
550 * Return 0 if permission is granted.
551 * @file_alloc_security:
552 * Allocate and attach a security structure to the file->f_security field.
553 * The security field is initialized to NULL when the structure is first
554 * created.
555 * @file contains the file structure to secure.
556 * Return 0 if the hook is successful and permission is granted.
557 * @file_free_security:
558 * Deallocate and free any security structures stored in file->f_security.
559 * @file contains the file structure being modified.
560 * @file_ioctl:
561 * @file contains the file structure.
562 * @cmd contains the operation to perform.
563 * @arg contains the operational arguments.
564 * Check permission for an ioctl operation on @file. Note that @arg can
565 * sometimes represents a user space pointer; in other cases, it may be a
566 * simple integer value. When @arg represents a user space pointer, it
567 * should never be used by the security module.
568 * Return 0 if permission is granted.
569 * @file_mmap :
570 * Check permissions for a mmap operation. The @file may be NULL, e.g.
571 * if mapping anonymous memory.
572 * @file contains the file structure for file to map (may be NULL).
573 * @reqprot contains the protection requested by the application.
574 * @prot contains the protection that will be applied by the kernel.
575 * @flags contains the operational flags.
576 * Return 0 if permission is granted.
577 * @file_mprotect:
578 * Check permissions before changing memory access permissions.
579 * @vma contains the memory region to modify.
580 * @reqprot contains the protection requested by the application.
581 * @prot contains the protection that will be applied by the kernel.
582 * Return 0 if permission is granted.
583 * @file_lock:
584 * Check permission before performing file locking operations.
585 * Note: this hook mediates both flock and fcntl style locks.
586 * @file contains the file structure.
587 * @cmd contains the posix-translated lock operation to perform
588 * (e.g. F_RDLCK, F_WRLCK).
589 * Return 0 if permission is granted.
590 * @file_fcntl:
591 * Check permission before allowing the file operation specified by @cmd
592 * from being performed on the file @file. Note that @arg can sometimes
593 * represents a user space pointer; in other cases, it may be a simple
594 * integer value. When @arg represents a user space pointer, it should
595 * never be used by the security module.
596 * @file contains the file structure.
597 * @cmd contains the operation to be performed.
598 * @arg contains the operational arguments.
599 * Return 0 if permission is granted.
600 * @file_set_fowner:
601 * Save owner security information (typically from current->security) in
602 * file->f_security for later use by the send_sigiotask hook.
603 * @file contains the file structure to update.
604 * Return 0 on success.
605 * @file_send_sigiotask:
606 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
607 * process @tsk. Note that this hook is sometimes called from interrupt.
608 * Note that the fown_struct, @fown, is never outside the context of a
609 * struct file, so the file structure (and associated security information)
610 * can always be obtained:
611 * container_of(fown, struct file, f_owner)
612 * @tsk contains the structure of task receiving signal.
613 * @fown contains the file owner information.
614 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
615 * Return 0 if permission is granted.
616 * @file_receive:
617 * This hook allows security modules to control the ability of a process
618 * to receive an open file descriptor via socket IPC.
619 * @file contains the file structure being received.
620 * Return 0 if permission is granted.
621 *
622 * Security hook for dentry
623 *
624 * @dentry_open
625 * Save open-time permission checking state for later use upon
626 * file_permission, and recheck access if anything has changed
627 * since inode_permission.
628 *
629 * Security hooks for task operations.
630 *
631 * @task_create:
632 * Check permission before creating a child process. See the clone(2)
633 * manual page for definitions of the @clone_flags.
634 * @clone_flags contains the flags indicating what should be shared.
635 * Return 0 if permission is granted.
636 * @cred_free:
637 * @cred points to the credentials.
638 * Deallocate and clear the cred->security field in a set of credentials.
639 * @cred_prepare:
640 * @new points to the new credentials.
641 * @old points to the original credentials.
642 * @gfp indicates the atomicity of any memory allocations.
643 * Prepare a new set of credentials by copying the data from the old set.
644 * @cred_commit:
645 * @new points to the new credentials.
646 * @old points to the original credentials.
647 * Install a new set of credentials.
648 * @kernel_act_as:
649 * Set the credentials for a kernel service to act as (subjective context).
650 * @new points to the credentials to be modified.
651 * @secid specifies the security ID to be set
652 * The current task must be the one that nominated @secid.
653 * Return 0 if successful.
654 * @kernel_create_files_as:
655 * Set the file creation context in a set of credentials to be the same as
656 * the objective context of the specified inode.
657 * @new points to the credentials to be modified.
658 * @inode points to the inode to use as a reference.
659 * The current task must be the one that nominated @inode.
660 * Return 0 if successful.
661 * @task_setuid:
662 * Check permission before setting one or more of the user identity
663 * attributes of the current process. The @flags parameter indicates
664 * which of the set*uid system calls invoked this hook and how to
665 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
666 * definitions at the beginning of this file for the @flags values and
667 * their meanings.
668 * @id0 contains a uid.
669 * @id1 contains a uid.
670 * @id2 contains a uid.
671 * @flags contains one of the LSM_SETID_* values.
672 * Return 0 if permission is granted.
673 * @task_fix_setuid:
674 * Update the module's state after setting one or more of the user
675 * identity attributes of the current process. The @flags parameter
676 * indicates which of the set*uid system calls invoked this hook. If
677 * @new is the set of credentials that will be installed. Modifications
678 * should be made to this rather than to @current->cred.
679 * @old is the set of credentials that are being replaces
680 * @flags contains one of the LSM_SETID_* values.
681 * Return 0 on success.
682 * @task_setgid:
683 * Check permission before setting one or more of the group identity
684 * attributes of the current process. The @flags parameter indicates
685 * which of the set*gid system calls invoked this hook and how to
686 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
687 * definitions at the beginning of this file for the @flags values and
688 * their meanings.
689 * @id0 contains a gid.
690 * @id1 contains a gid.
691 * @id2 contains a gid.
692 * @flags contains one of the LSM_SETID_* values.
693 * Return 0 if permission is granted.
694 * @task_setpgid:
695 * Check permission before setting the process group identifier of the
696 * process @p to @pgid.
697 * @p contains the task_struct for process being modified.
698 * @pgid contains the new pgid.
699 * Return 0 if permission is granted.
700 * @task_getpgid:
701 * Check permission before getting the process group identifier of the
702 * process @p.
703 * @p contains the task_struct for the process.
704 * Return 0 if permission is granted.
705 * @task_getsid:
706 * Check permission before getting the session identifier of the process
707 * @p.
708 * @p contains the task_struct for the process.
709 * Return 0 if permission is granted.
710 * @task_getsecid:
711 * Retrieve the security identifier of the process @p.
712 * @p contains the task_struct for the process and place is into @secid.
713 * In case of failure, @secid will be set to zero.
714 *
715 * @task_setgroups:
716 * Check permission before setting the supplementary group set of the
717 * current process.
718 * @group_info contains the new group information.
719 * Return 0 if permission is granted.
720 * @task_setnice:
721 * Check permission before setting the nice value of @p to @nice.
722 * @p contains the task_struct of process.
723 * @nice contains the new nice value.
724 * Return 0 if permission is granted.
725 * @task_setioprio
726 * Check permission before setting the ioprio value of @p to @ioprio.
727 * @p contains the task_struct of process.
728 * @ioprio contains the new ioprio value
729 * Return 0 if permission is granted.
730 * @task_getioprio
731 * Check permission before getting the ioprio value of @p.
732 * @p contains the task_struct of process.
733 * Return 0 if permission is granted.
734 * @task_setrlimit:
735 * Check permission before setting the resource limits of the current
736 * process for @resource to @new_rlim. The old resource limit values can
737 * be examined by dereferencing (current->signal->rlim + resource).
738 * @resource contains the resource whose limit is being set.
739 * @new_rlim contains the new limits for @resource.
740 * Return 0 if permission is granted.
741 * @task_setscheduler:
742 * Check permission before setting scheduling policy and/or parameters of
743 * process @p based on @policy and @lp.
744 * @p contains the task_struct for process.
745 * @policy contains the scheduling policy.
746 * @lp contains the scheduling parameters.
747 * Return 0 if permission is granted.
748 * @task_getscheduler:
749 * Check permission before obtaining scheduling information for process
750 * @p.
751 * @p contains the task_struct for process.
752 * Return 0 if permission is granted.
753 * @task_movememory
754 * Check permission before moving memory owned by process @p.
755 * @p contains the task_struct for process.
756 * Return 0 if permission is granted.
757 * @task_kill:
758 * Check permission before sending signal @sig to @p. @info can be NULL,
759 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
760 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
761 * from the kernel and should typically be permitted.
762 * SIGIO signals are handled separately by the send_sigiotask hook in
763 * file_security_ops.
764 * @p contains the task_struct for process.
765 * @info contains the signal information.
766 * @sig contains the signal value.
767 * @secid contains the sid of the process where the signal originated
768 * Return 0 if permission is granted.
769 * @task_wait:
770 * Check permission before allowing a process to reap a child process @p
771 * and collect its status information.
772 * @p contains the task_struct for process.
773 * Return 0 if permission is granted.
774 * @task_prctl:
775 * Check permission before performing a process control operation on the
776 * current process.
777 * @option contains the operation.
778 * @arg2 contains a argument.
779 * @arg3 contains a argument.
780 * @arg4 contains a argument.
781 * @arg5 contains a argument.
782 * Return -ENOSYS if no-one wanted to handle this op, any other value to
783 * cause prctl() to return immediately with that value.
784 * @task_to_inode:
785 * Set the security attributes for an inode based on an associated task's
786 * security attributes, e.g. for /proc/pid inodes.
787 * @p contains the task_struct for the task.
788 * @inode contains the inode structure for the inode.
789 *
790 * Security hooks for Netlink messaging.
791 *
792 * @netlink_send:
793 * Save security information for a netlink message so that permission
794 * checking can be performed when the message is processed. The security
795 * information can be saved using the eff_cap field of the
796 * netlink_skb_parms structure. Also may be used to provide fine
797 * grained control over message transmission.
798 * @sk associated sock of task sending the message.,
799 * @skb contains the sk_buff structure for the netlink message.
800 * Return 0 if the information was successfully saved and message
801 * is allowed to be transmitted.
802 * @netlink_recv:
803 * Check permission before processing the received netlink message in
804 * @skb.
805 * @skb contains the sk_buff structure for the netlink message.
806 * @cap indicates the capability required
807 * Return 0 if permission is granted.
808 *
809 * Security hooks for Unix domain networking.
810 *
811 * @unix_stream_connect:
812 * Check permissions before establishing a Unix domain stream connection
813 * between @sock and @other.
814 * @sock contains the socket structure.
815 * @other contains the peer socket structure.
816 * Return 0 if permission is granted.
817 * @unix_may_send:
818 * Check permissions before connecting or sending datagrams from @sock to
819 * @other.
820 * @sock contains the socket structure.
821 * @sock contains the peer socket structure.
822 * Return 0 if permission is granted.
823 *
824 * The @unix_stream_connect and @unix_may_send hooks were necessary because
825 * Linux provides an alternative to the conventional file name space for Unix
826 * domain sockets. Whereas binding and connecting to sockets in the file name
827 * space is mediated by the typical file permissions (and caught by the mknod
828 * and permission hooks in inode_security_ops), binding and connecting to
829 * sockets in the abstract name space is completely unmediated. Sufficient
830 * control of Unix domain sockets in the abstract name space isn't possible
831 * using only the socket layer hooks, since we need to know the actual target
832 * socket, which is not looked up until we are inside the af_unix code.
833 *
834 * Security hooks for socket operations.
835 *
836 * @socket_create:
837 * Check permissions prior to creating a new socket.
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 * Return 0 if permission is granted.
843 * @socket_post_create:
844 * This hook allows a module to update or allocate a per-socket security
845 * structure. Note that the security field was not added directly to the
846 * socket structure, but rather, the socket security information is stored
847 * in the associated inode. Typically, the inode alloc_security hook will
848 * allocate and and attach security information to
849 * sock->inode->i_security. This hook may be used to update the
850 * sock->inode->i_security field with additional information that wasn't
851 * available when the inode was allocated.
852 * @sock contains the newly created socket structure.
853 * @family contains the requested protocol family.
854 * @type contains the requested communications type.
855 * @protocol contains the requested protocol.
856 * @kern set to 1 if a kernel socket.
857 * @socket_bind:
858 * Check permission before socket protocol layer bind operation is
859 * performed and the socket @sock is bound to the address specified in the
860 * @address parameter.
861 * @sock contains the socket structure.
862 * @address contains the address to bind to.
863 * @addrlen contains the length of address.
864 * Return 0 if permission is granted.
865 * @socket_connect:
866 * Check permission before socket protocol layer connect operation
867 * attempts to connect socket @sock to a remote address, @address.
868 * @sock contains the socket structure.
869 * @address contains the address of remote endpoint.
870 * @addrlen contains the length of address.
871 * Return 0 if permission is granted.
872 * @socket_listen:
873 * Check permission before socket protocol layer listen operation.
874 * @sock contains the socket structure.
875 * @backlog contains the maximum length for the pending connection queue.
876 * Return 0 if permission is granted.
877 * @socket_accept:
878 * Check permission before accepting a new connection. Note that the new
879 * socket, @newsock, has been created and some information copied to it,
880 * but the accept operation has not actually been performed.
881 * @sock contains the listening socket structure.
882 * @newsock contains the newly created server socket for connection.
883 * Return 0 if permission is granted.
884 * @socket_sendmsg:
885 * Check permission before transmitting a message to another socket.
886 * @sock contains the socket structure.
887 * @msg contains the message to be transmitted.
888 * @size contains the size of message.
889 * Return 0 if permission is granted.
890 * @socket_recvmsg:
891 * Check permission before receiving a message from a socket.
892 * @sock contains the socket structure.
893 * @msg contains the message structure.
894 * @size contains the size of message structure.
895 * @flags contains the operational flags.
896 * Return 0 if permission is granted.
897 * @socket_getsockname:
898 * Check permission before the local address (name) of the socket object
899 * @sock is retrieved.
900 * @sock contains the socket structure.
901 * Return 0 if permission is granted.
902 * @socket_getpeername:
903 * Check permission before the remote address (name) of a socket object
904 * @sock is retrieved.
905 * @sock contains the socket structure.
906 * Return 0 if permission is granted.
907 * @socket_getsockopt:
908 * Check permissions before retrieving the options associated with socket
909 * @sock.
910 * @sock contains the socket structure.
911 * @level contains the protocol level to retrieve option from.
912 * @optname contains the name of option to retrieve.
913 * Return 0 if permission is granted.
914 * @socket_setsockopt:
915 * Check permissions before setting the options associated with socket
916 * @sock.
917 * @sock contains the socket structure.
918 * @level contains the protocol level to set options for.
919 * @optname contains the name of the option to set.
920 * Return 0 if permission is granted.
921 * @socket_shutdown:
922 * Checks permission before all or part of a connection on the socket
923 * @sock is shut down.
924 * @sock contains the socket structure.
925 * @how contains the flag indicating how future sends and receives are handled.
926 * Return 0 if permission is granted.
927 * @socket_sock_rcv_skb:
928 * Check permissions on incoming network packets. This hook is distinct
929 * from Netfilter's IP input hooks since it is the first time that the
930 * incoming sk_buff @skb has been associated with a particular socket, @sk.
931 * @sk contains the sock (not socket) associated with the incoming sk_buff.
932 * @skb contains the incoming network data.
933 * @socket_getpeersec_stream:
934 * This hook allows the security module to provide peer socket security
935 * state for unix or connected tcp sockets to userspace via getsockopt
936 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
937 * socket is associated with an ipsec SA.
938 * @sock is the local socket.
939 * @optval userspace memory where the security state is to be copied.
940 * @optlen userspace int where the module should copy the actual length
941 * of the security state.
942 * @len as input is the maximum length to copy to userspace provided
943 * by the caller.
944 * Return 0 if all is well, otherwise, typical getsockopt return
945 * values.
946 * @socket_getpeersec_dgram:
947 * This hook allows the security module to provide peer socket security
948 * state for udp sockets on a per-packet basis to userspace via
949 * getsockopt SO_GETPEERSEC. The application must first have indicated
950 * the IP_PASSSEC option via getsockopt. It can then retrieve the
951 * security state returned by this hook for a packet via the SCM_SECURITY
952 * ancillary message type.
953 * @skb is the skbuff for the packet being queried
954 * @secdata is a pointer to a buffer in which to copy the security data
955 * @seclen is the maximum length for @secdata
956 * Return 0 on success, error on failure.
957 * @sk_alloc_security:
958 * Allocate and attach a security structure to the sk->sk_security field,
959 * which is used to copy security attributes between local stream sockets.
960 * @sk_free_security:
961 * Deallocate security structure.
962 * @sk_clone_security:
963 * Clone/copy security structure.
964 * @sk_getsecid:
965 * Retrieve the LSM-specific secid for the sock to enable caching of network
966 * authorizations.
967 * @sock_graft:
968 * Sets the socket's isec sid to the sock's sid.
969 * @inet_conn_request:
970 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
971 * @inet_csk_clone:
972 * Sets the new child socket's sid to the openreq sid.
973 * @inet_conn_established:
974 * Sets the connection's peersid to the secmark on skb.
975 * @req_classify_flow:
976 * Sets the flow's sid to the openreq sid.
977 *
978 * Security hooks for XFRM operations.
979 *
980 * @xfrm_policy_alloc_security:
981 * @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
982 * Database used by the XFRM system.
983 * @sec_ctx contains the security context information being provided by
984 * the user-level policy update program (e.g., setkey).
985 * Allocate a security structure to the xp->security field; the security
986 * field is initialized to NULL when the xfrm_policy is allocated.
987 * Return 0 if operation was successful (memory to allocate, legal context)
988 * @xfrm_policy_clone_security:
989 * @old_ctx contains an existing xfrm_sec_ctx.
990 * @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
991 * Allocate a security structure in new_ctxp that contains the
992 * information from the old_ctx structure.
993 * Return 0 if operation was successful (memory to allocate).
994 * @xfrm_policy_free_security:
995 * @ctx contains the xfrm_sec_ctx
996 * Deallocate xp->security.
997 * @xfrm_policy_delete_security:
998 * @ctx contains the xfrm_sec_ctx.
999 * Authorize deletion of xp->security.
1000 * @xfrm_state_alloc_security:
1001 * @x contains the xfrm_state being added to the Security Association
1002 * Database by the XFRM system.
1003 * @sec_ctx contains the security context information being provided by
1004 * the user-level SA generation program (e.g., setkey or racoon).
1005 * @secid contains the secid from which to take the mls portion of the context.
1006 * Allocate a security structure to the x->security field; the security
1007 * field is initialized to NULL when the xfrm_state is allocated. Set the
1008 * context to correspond to either sec_ctx or polsec, with the mls portion
1009 * taken from secid in the latter case.
1010 * Return 0 if operation was successful (memory to allocate, legal context).
1011 * @xfrm_state_free_security:
1012 * @x contains the xfrm_state.
1013 * Deallocate x->security.
1014 * @xfrm_state_delete_security:
1015 * @x contains the xfrm_state.
1016 * Authorize deletion of x->security.
1017 * @xfrm_policy_lookup:
1018 * @ctx contains the xfrm_sec_ctx for which the access control is being
1019 * checked.
1020 * @fl_secid contains the flow security label that is used to authorize
1021 * access to the policy xp.
1022 * @dir contains the direction of the flow (input or output).
1023 * Check permission when a flow selects a xfrm_policy for processing
1024 * XFRMs on a packet. The hook is called when selecting either a
1025 * per-socket policy or a generic xfrm policy.
1026 * Return 0 if permission is granted, -ESRCH otherwise, or -errno
1027 * on other errors.
1028 * @xfrm_state_pol_flow_match:
1029 * @x contains the state to match.
1030 * @xp contains the policy to check for a match.
1031 * @fl contains the flow to check for a match.
1032 * Return 1 if there is a match.
1033 * @xfrm_decode_session:
1034 * @skb points to skb to decode.
1035 * @secid points to the flow key secid to set.
1036 * @ckall says if all xfrms used should be checked for same secid.
1037 * Return 0 if ckall is zero or all xfrms used have the same secid.
1038 *
1039 * Security hooks affecting all Key Management operations
1040 *
1041 * @key_alloc:
1042 * Permit allocation of a key and assign security data. Note that key does
1043 * not have a serial number assigned at this point.
1044 * @key points to the key.
1045 * @flags is the allocation flags
1046 * Return 0 if permission is granted, -ve error otherwise.
1047 * @key_free:
1048 * Notification of destruction; free security data.
1049 * @key points to the key.
1050 * No return value.
1051 * @key_permission:
1052 * See whether a specific operational right is granted to a process on a
1053 * key.
1054 * @key_ref refers to the key (key pointer + possession attribute bit).
1055 * @cred points to the credentials to provide the context against which to
1056 * evaluate the security data on the key.
1057 * @perm describes the combination of permissions required of this key.
1058 * Return 1 if permission granted, 0 if permission denied and -ve it the
1059 * normal permissions model should be effected.
1060 * @key_getsecurity:
1061 * Get a textual representation of the security context attached to a key
1062 * for the purposes of honouring KEYCTL_GETSECURITY. This function
1063 * allocates the storage for the NUL-terminated string and the caller
1064 * should free it.
1065 * @key points to the key to be queried.
1066 * @_buffer points to a pointer that should be set to point to the
1067 * resulting string (if no label or an error occurs).
1068 * Return the length of the string (including terminating NUL) or -ve if
1069 * an error.
1070 * May also return 0 (and a NULL buffer pointer) if there is no label.
1071 *
1072 * Security hooks affecting all System V IPC operations.
1073 *
1074 * @ipc_permission:
1075 * Check permissions for access to IPC
1076 * @ipcp contains the kernel IPC permission structure
1077 * @flag contains the desired (requested) permission set
1078 * Return 0 if permission is granted.
1079 * @ipc_getsecid:
1080 * Get the secid associated with the ipc object.
1081 * @ipcp contains the kernel IPC permission structure.
1082 * @secid contains a pointer to the location where result will be saved.
1083 * In case of failure, @secid will be set to zero.
1084 *
1085 * Security hooks for individual messages held in System V IPC message queues
1086 * @msg_msg_alloc_security:
1087 * Allocate and attach a security structure to the msg->security field.
1088 * The security field is initialized to NULL when the structure is first
1089 * created.
1090 * @msg contains the message structure to be modified.
1091 * Return 0 if operation was successful and permission is granted.
1092 * @msg_msg_free_security:
1093 * Deallocate the security structure for this message.
1094 * @msg contains the message structure to be modified.
1095 *
1096 * Security hooks for System V IPC Message Queues
1097 *
1098 * @msg_queue_alloc_security:
1099 * Allocate and attach a security structure to the
1100 * msq->q_perm.security field. The security field is initialized to
1101 * NULL when the structure is first created.
1102 * @msq contains the message queue structure to be modified.
1103 * Return 0 if operation was successful and permission is granted.
1104 * @msg_queue_free_security:
1105 * Deallocate security structure for this message queue.
1106 * @msq contains the message queue structure to be modified.
1107 * @msg_queue_associate:
1108 * Check permission when a message queue is requested through the
1109 * msgget system call. This hook is only called when returning the
1110 * message queue identifier for an existing message queue, not when a
1111 * new message queue is created.
1112 * @msq contains the message queue to act upon.
1113 * @msqflg contains the operation control flags.
1114 * Return 0 if permission is granted.
1115 * @msg_queue_msgctl:
1116 * Check permission when a message control operation specified by @cmd
1117 * is to be performed on the message queue @msq.
1118 * The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1119 * @msq contains the message queue to act upon. May be NULL.
1120 * @cmd contains the operation to be performed.
1121 * Return 0 if permission is granted.
1122 * @msg_queue_msgsnd:
1123 * Check permission before a message, @msg, is enqueued on the message
1124 * queue, @msq.
1125 * @msq contains the message queue to send message to.
1126 * @msg contains the message to be enqueued.
1127 * @msqflg contains operational flags.
1128 * Return 0 if permission is granted.
1129 * @msg_queue_msgrcv:
1130 * Check permission before a message, @msg, is removed from the message
1131 * queue, @msq. The @target task structure contains a pointer to the
1132 * process that will be receiving the message (not equal to the current
1133 * process when inline receives are being performed).
1134 * @msq contains the message queue to retrieve message from.
1135 * @msg contains the message destination.
1136 * @target contains the task structure for recipient process.
1137 * @type contains the type of message requested.
1138 * @mode contains the operational flags.
1139 * Return 0 if permission is granted.
1140 *
1141 * Security hooks for System V Shared Memory Segments
1142 *
1143 * @shm_alloc_security:
1144 * Allocate and attach a security structure to the shp->shm_perm.security
1145 * field. The security field is initialized to NULL when the structure is
1146 * first created.
1147 * @shp contains the shared memory structure to be modified.
1148 * Return 0 if operation was successful and permission is granted.
1149 * @shm_free_security:
1150 * Deallocate the security struct for this memory segment.
1151 * @shp contains the shared memory structure to be modified.
1152 * @shm_associate:
1153 * Check permission when a shared memory region is requested through the
1154 * shmget system call. This hook is only called when returning the shared
1155 * memory region identifier for an existing region, not when a new shared
1156 * memory region is created.
1157 * @shp contains the shared memory structure to be modified.
1158 * @shmflg contains the operation control flags.
1159 * Return 0 if permission is granted.
1160 * @shm_shmctl:
1161 * Check permission when a shared memory control operation specified by
1162 * @cmd is to be performed on the shared memory region @shp.
1163 * The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1164 * @shp contains shared memory structure to be modified.
1165 * @cmd contains the operation to be performed.
1166 * Return 0 if permission is granted.
1167 * @shm_shmat:
1168 * Check permissions prior to allowing the shmat system call to attach the
1169 * shared memory segment @shp to the data segment of the calling process.
1170 * The attaching address is specified by @shmaddr.
1171 * @shp contains the shared memory structure to be modified.
1172 * @shmaddr contains the address to attach memory region to.
1173 * @shmflg contains the operational flags.
1174 * Return 0 if permission is granted.
1175 *
1176 * Security hooks for System V Semaphores
1177 *
1178 * @sem_alloc_security:
1179 * Allocate and attach a security structure to the sma->sem_perm.security
1180 * field. The security field is initialized to NULL when the structure is
1181 * first created.
1182 * @sma contains the semaphore structure
1183 * Return 0 if operation was successful and permission is granted.
1184 * @sem_free_security:
1185 * deallocate security struct for this semaphore
1186 * @sma contains the semaphore structure.
1187 * @sem_associate:
1188 * Check permission when a semaphore is requested through the semget
1189 * system call. This hook is only called when returning the semaphore
1190 * identifier for an existing semaphore, not when a new one must be
1191 * created.
1192 * @sma contains the semaphore structure.
1193 * @semflg contains the operation control flags.
1194 * Return 0 if permission is granted.
1195 * @sem_semctl:
1196 * Check permission when a semaphore operation specified by @cmd is to be
1197 * performed on the semaphore @sma. The @sma may be NULL, e.g. for
1198 * IPC_INFO or SEM_INFO.
1199 * @sma contains the semaphore structure. May be NULL.
1200 * @cmd contains the operation to be performed.
1201 * Return 0 if permission is granted.
1202 * @sem_semop
1203 * Check permissions before performing operations on members of the
1204 * semaphore set @sma. If the @alter flag is nonzero, the semaphore set
1205 * may be modified.
1206 * @sma contains the semaphore structure.
1207 * @sops contains the operations to perform.
1208 * @nsops contains the number of operations to perform.
1209 * @alter contains the flag indicating whether changes are to be made.
1210 * Return 0 if permission is granted.
1211 *
1212 * @ptrace_may_access:
1213 * Check permission before allowing the current process to trace the
1214 * @child process.
1215 * Security modules may also want to perform a process tracing check
1216 * during an execve in the set_security or apply_creds hooks of
1217 * tracing check during an execve in the bprm_set_creds hook of
1218 * binprm_security_ops if the process is being traced and its security
1219 * attributes would be changed by the execve.
1220 * @child contains the task_struct structure for the target process.
1221 * @mode contains the PTRACE_MODE flags indicating the form of access.
1222 * Return 0 if permission is granted.
1223 * @ptrace_traceme:
1224 * Check that the @parent process has sufficient permission to trace the
1225 * current process before allowing the current process to present itself
1226 * to the @parent process for tracing.
1227 * The parent process will still have to undergo the ptrace_may_access
1228 * checks before it is allowed to trace this one.
1229 * @parent contains the task_struct structure for debugger process.
1230 * Return 0 if permission is granted.
1231 * @capget:
1232 * Get the @effective, @inheritable, and @permitted capability sets for
1233 * the @target process. The hook may also perform permission checking to
1234 * determine if the current process is allowed to see the capability sets
1235 * of the @target process.
1236 * @target contains the task_struct structure for target process.
1237 * @effective contains the effective capability set.
1238 * @inheritable contains the inheritable capability set.
1239 * @permitted contains the permitted capability set.
1240 * Return 0 if the capability sets were successfully obtained.
1241 * @capset:
1242 * Set the @effective, @inheritable, and @permitted capability sets for
1243 * the current process.
1244 * @new contains the new credentials structure for target process.
1245 * @old contains the current credentials structure for target process.
1246 * @effective contains the effective capability set.
1247 * @inheritable contains the inheritable capability set.
1248 * @permitted contains the permitted capability set.
1249 * Return 0 and update @new if permission is granted.
1250 * @capable:
1251 * Check whether the @tsk process has the @cap capability in the indicated
1252 * credentials.
1253 * @tsk contains the task_struct for the process.
1254 * @cred contains the credentials to use.
1255 * @cap contains the capability <include/linux/capability.h>.
1256 * @audit: Whether to write an audit message or not
1257 * Return 0 if the capability is granted for @tsk.
1258 * @acct:
1259 * Check permission before enabling or disabling process accounting. If
1260 * accounting is being enabled, then @file refers to the open file used to
1261 * store accounting records. If accounting is being disabled, then @file
1262 * is NULL.
1263 * @file contains the file structure for the accounting file (may be NULL).
1264 * Return 0 if permission is granted.
1265 * @sysctl:
1266 * Check permission before accessing the @table sysctl variable in the
1267 * manner specified by @op.
1268 * @table contains the ctl_table structure for the sysctl variable.
1269 * @op contains the operation (001 = search, 002 = write, 004 = read).
1270 * Return 0 if permission is granted.
1271 * @syslog:
1272 * Check permission before accessing the kernel message ring or changing
1273 * logging to the console.
1274 * See the syslog(2) manual page for an explanation of the @type values.
1275 * @type contains the type of action.
1276 * Return 0 if permission is granted.
1277 * @settime:
1278 * Check permission to change the system time.
1279 * struct timespec and timezone are defined in include/linux/time.h
1280 * @ts contains new time
1281 * @tz contains new timezone
1282 * Return 0 if permission is granted.
1283 * @vm_enough_memory:
1284 * Check permissions for allocating a new virtual mapping.
1285 * @mm contains the mm struct it is being added to.
1286 * @pages contains the number of pages.
1287 * Return 0 if permission is granted.
1288 *
1289 * @secid_to_secctx:
1290 * Convert secid to security context.
1291 * @secid contains the security ID.
1292 * @secdata contains the pointer that stores the converted security context.
1293 * @secctx_to_secid:
1294 * Convert security context to secid.
1295 * @secid contains the pointer to the generated security ID.
1296 * @secdata contains the security context.
1297 *
1298 * @release_secctx:
1299 * Release the security context.
1300 * @secdata contains the security context.
1301 * @seclen contains the length of the security context.
1302 *
1303 * Security hooks for Audit
1304 *
1305 * @audit_rule_init:
1306 * Allocate and initialize an LSM audit rule structure.
1307 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1308 * @op contains the operator the rule uses.
1309 * @rulestr contains the context where the rule will be applied to.
1310 * @lsmrule contains a pointer to receive the result.
1311 * Return 0 if @lsmrule has been successfully set,
1312 * -EINVAL in case of an invalid rule.
1313 *
1314 * @audit_rule_known:
1315 * Specifies whether given @rule contains any fields related to current LSM.
1316 * @rule contains the audit rule of interest.
1317 * Return 1 in case of relation found, 0 otherwise.
1318 *
1319 * @audit_rule_match:
1320 * Determine if given @secid matches a rule previously approved
1321 * by @audit_rule_known.
1322 * @secid contains the security id in question.
1323 * @field contains the field which relates to current LSM.
1324 * @op contains the operator that will be used for matching.
1325 * @rule points to the audit rule that will be checked against.
1326 * @actx points to the audit context associated with the check.
1327 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1328 *
1329 * @audit_rule_free:
1330 * Deallocate the LSM audit rule structure previously allocated by
1331 * audit_rule_init.
1332 * @rule contains the allocated rule
1333 *
1334 * This is the main security structure.
1335 */
1391 #ifdef CONFIG_SECURITY_PATH
1405 #endif
1439 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1440 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1468 gfp_t gfp);
1539 #ifdef CONFIG_SECURITY_NETWORK
1563 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1577 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1580 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1585 u32 secid);
1595 /* key management security hooks */
1596 #ifdef CONFIG_KEYS
1601 key_perm_t perm);
1605 #ifdef CONFIG_AUDIT
1612 };
1614 /* prototypes */
1619 /* Security operations */
1698 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1699 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1781 };
1784 {
1785 }
1788 {
1789 }
1791 /*
1792 * This is the default capabilities functionality. Most of these functions
1793 * are just stubbed out, but a few must call the proper capable code.
1794 */
1797 {
1799 }
1803 {
1805 }
1808 {
1810 }
1816 {
1818 }
1825 {
1827 }
1830 {
1832 }
1835 {
1842 }
1846 {
1851 SECURITY_CAP_NOAUDIT);
1854 }
1857 {
1859 }
1862 {
1864 }
1868 {
1870 }
1873 {
1875 }
1878 {
1880 }
1883 {
1885 }
1888 {
1891 }
1894 {
1897 }
1900 {
1901 /* If current->mm is a kernel thread then we will pass NULL,
1902 for this specific case that is fine */
1904 }
1907 {
1909 }
1912 {
1914 }
1917 {
1918 }
1921 {
1922 }
1925 {
1927 }
1930 {
1932 }
1935 { }
1938 {
1940 }
1943 {
1945 }
1949 {
1951 }
1954 {
1956 }
1961 {
1963 }
1967 {
1969 }
1972 {
1974 }
1977 { }
1980 { }
1984 { }
1988 { }
1992 {
1994 }
1998 { }
2002 {
2004 }
2008 { }
2011 {
2013 }
2016 {
2018 }
2021 { }
2028 {
2030 }
2035 {
2037 }
2042 {
2044 }
2048 {
2050 }
2055 {
2057 }
2062 {
2064 }
2068 {
2070 }
2075 {
2077 }
2083 {
2085 }
2088 {
2090 }
2094 {
2096 }
2099 {
2101 }
2105 {
2107 }
2111 {
2113 }
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 { }
2254 gfp_t gfp)
2255 {
2257 }
2261 {
2262 }
2265 {
2267 }
2271 {
2273 }
2277 {
2279 }
2284 {
2286 }
2290 {
2292 }
2295 {
2297 }
2300 {
2302 }
2305 {
2307 }
2310 {
2312 }
2315 {
2317 }
2320 {
2322 }
2325 {
2327 }
2330 {
2332 }
2336 {
2338 }
2343 {
2345 }
2348 {
2350 }
2353 {
2355 }
2359 u32 secid)
2360 {
2362 }
2365 {
2367 }
2373 {
2375 }
2378 { }
2382 {
2384 }
2387 {
2389 }
2392 {
2394 }
2397 { }
2400 {
2402 }
2405 { }
2409 {
2411 }
2414 {
2416 }
2420 {
2422 }
2428 {
2430 }
2433 {
2435 }
2438 { }
2442 {
2444 }
2447 {
2449 }
2453 {
2455 }
2458 {
2460 }
2463 { }
2466 {
2468 }
2471 {
2473 }
2478 {
2480 }
2483 { }
2486 {
2488 }
2490 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2491 {
2493 }
2496 {
2498 }
2501 {
2503 }
2506 {
2508 }
2511 u32 seclen,
2513 {
2515 }
2518 {
2519 }
2522 #ifdef CONFIG_SECURITY_NETWORK
2563 {
2565 }
2569 {
2571 }
2575 {
2577 }
2583 {
2585 }
2590 {
2592 }
2597 {
2599 }
2602 {
2604 }
2608 {
2610 }
2614 {
2616 }
2621 {
2623 }
2626 {
2628 }
2631 {
2633 }
2637 {
2639 }
2643 {
2645 }
2648 {
2650 }
2653 {
2655 }
2659 {
2661 }
2663 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2664 {
2666 }
2669 {
2671 }
2674 {
2675 }
2678 {
2679 }
2682 {
2683 }
2685 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2686 {
2687 }
2690 {
2691 }
2695 {
2697 }
2701 {
2702 }
2706 {
2707 }
2710 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2729 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2730 {
2732 }
2734 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2735 {
2737 }
2740 {
2741 }
2744 {
2746 }
2750 {
2752 }
2756 {
2758 }
2761 {
2762 }
2765 {
2767 }
2770 {
2772 }
2776 {
2778 }
2781 {
2783 }
2786 {
2787 }
2791 #ifdef CONFIG_SECURITY_PATH
2807 {
2809 }
2813 {
2815 }
2818 {
2820 }
2824 {
2826 }
2830 {
2832 }
2836 {
2838 }
2843 {
2845 }
2851 {
2853 }
2856 #ifdef CONFIG_KEYS
2857 #ifdef CONFIG_SECURITY
2865 #else
2870 {
2872 }
2875 {
2876 }
2880 key_perm_t perm)
2881 {
2883 }
2886 {
2889 }
2891 #endif
2894 #ifdef CONFIG_AUDIT
2895 #ifdef CONFIG_SECURITY
2902 #else
2906 {
2908 }
2911 {
2913 }
2917 {
2919 }
2922 { }
2927 #ifdef CONFIG_SECURITYFS
2939 {
2941 }
2944 mode_t mode,
2948 {
2950 }
2953 {}
2955 #endif
2957 #ifdef CONFIG_SECURITY
2960 {
2962 }
2965 {
2967 }
2969 #else
2972 {
2974 }
2977 { }