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1 /*
2 * Linux Security plug
3 *
4 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
5 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
7 * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
8 * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * Due to this file being licensed under the GPL there is controversy over
16 * whether this permits you to write a module that #includes this file
17 * without placing your module under the GPL. Please consult a lawyer for
18 * advice before doing this.
19 *
20 */
22 #ifndef __LINUX_SECURITY_H
23 #define __LINUX_SECURITY_H
25 #include <linux/fs.h>
26 #include <linux/binfmts.h>
27 #include <linux/signal.h>
28 #include <linux/resource.h>
29 #include <linux/sem.h>
30 #include <linux/shm.h>
31 #include <linux/msg.h>
32 #include <linux/sched.h>
33 #include <linux/key.h>
34 #include <linux/xfrm.h>
35 #include <net/flow.h>
37 /* Maximum number of letters for an LSM name string */
38 #define SECURITY_NAME_MAX 10
40 /* If capable should audit the security request */
41 #define SECURITY_CAP_NOAUDIT 0
42 #define SECURITY_CAP_AUDIT 1
47 /*
48 * These functions are in security/capability.c and are used
49 * as the default capabilities functions
50 */
56 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
94 /*
95 * Values used in the task_security_ops calls
96 */
97 /* setuid or setgid, id0 == uid or gid */
98 #define LSM_SETID_ID 1
100 /* setreuid or setregid, id0 == real, id1 == eff */
101 #define LSM_SETID_RE 2
103 /* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
104 #define LSM_SETID_RES 4
106 /* setfsuid or setfsgid, id0 == fsuid or fsgid */
107 #define LSM_SETID_FS 8
109 /* forward declares to avoid warnings */
113 /* bprm->unsafe reasons */
114 #define LSM_UNSAFE_SHARE 1
115 #define LSM_UNSAFE_PTRACE 2
116 #define LSM_UNSAFE_PTRACE_CAP 4
118 #ifdef CONFIG_SECURITY
124 };
127 {
131 }
134 {
144 }
146 /**
147 * struct security_operations - main security structure
148 *
149 * Security module identifier.
150 *
151 * @name:
152 * A string that acts as a unique identifeir for the LSM with max number
153 * of characters = SECURITY_NAME_MAX.
154 *
155 * Security hooks for program execution operations.
156 *
157 * @bprm_set_creds:
158 * Save security information in the bprm->security field, typically based
159 * on information about the bprm->file, for later use by the apply_creds
160 * hook. This hook may also optionally check permissions (e.g. for
161 * transitions between security domains).
162 * This hook may be called multiple times during a single execve, e.g. for
163 * interpreters. The hook can tell whether it has already been called by
164 * checking to see if @bprm->security is non-NULL. If so, then the hook
165 * may decide either to retain the security information saved earlier or
166 * to replace it.
167 * @bprm contains the linux_binprm structure.
168 * Return 0 if the hook is successful and permission is granted.
169 * @bprm_check_security:
170 * This hook mediates the point when a search for a binary handler will
171 * begin. It allows a check the @bprm->security value which is set in the
172 * preceding set_creds call. The primary difference from set_creds is
173 * that the argv list and envp list are reliably available in @bprm. This
174 * hook may be called multiple times during a single execve; and in each
175 * pass set_creds is called first.
176 * @bprm contains the linux_binprm structure.
177 * Return 0 if the hook is successful and permission is granted.
178 * @bprm_committing_creds:
179 * Prepare to install the new security attributes of a process being
180 * transformed by an execve operation, based on the old credentials
181 * pointed to by @current->cred and the information set in @bprm->cred by
182 * the bprm_set_creds hook. @bprm points to the linux_binprm structure.
183 * This hook is a good place to perform state changes on the process such
184 * as closing open file descriptors to which access will no longer be
185 * granted when the attributes are changed. This is called immediately
186 * before commit_creds().
187 * @bprm_committed_creds:
188 * Tidy up after the installation of the new security attributes of a
189 * process being transformed by an execve operation. The new credentials
190 * have, by this point, been set to @current->cred. @bprm points to the
191 * linux_binprm structure. This hook is a good place to perform state
192 * changes on the process such as clearing out non-inheritable signal
193 * state. This is called immediately after commit_creds().
194 * @bprm_secureexec:
195 * Return a boolean value (0 or 1) indicating whether a "secure exec"
196 * is required. The flag is passed in the auxiliary table
197 * on the initial stack to the ELF interpreter to indicate whether libc
198 * should enable secure mode.
199 * @bprm contains the linux_binprm structure.
200 *
201 * Security hooks for filesystem operations.
202 *
203 * @sb_alloc_security:
204 * Allocate and attach a security structure to the sb->s_security field.
205 * The s_security field is initialized to NULL when the structure is
206 * allocated.
207 * @sb contains the super_block structure to be modified.
208 * Return 0 if operation was successful.
209 * @sb_free_security:
210 * Deallocate and clear the sb->s_security field.
211 * @sb contains the super_block structure to be modified.
212 * @sb_statfs:
213 * Check permission before obtaining filesystem statistics for the @mnt
214 * mountpoint.
215 * @dentry is a handle on the superblock for the filesystem.
216 * Return 0 if permission is granted.
217 * @sb_mount:
218 * Check permission before an object specified by @dev_name is mounted on
219 * the mount point named by @nd. For an ordinary mount, @dev_name
220 * identifies a device if the file system type requires a device. For a
221 * remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a
222 * loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
223 * pathname of the object being mounted.
224 * @dev_name contains the name for object being mounted.
225 * @path contains the path for mount point object.
226 * @type contains the filesystem type.
227 * @flags contains the mount flags.
228 * @data contains the filesystem-specific data.
229 * Return 0 if permission is granted.
230 * @sb_copy_data:
231 * Allow mount option data to be copied prior to parsing by the filesystem,
232 * so that the security module can extract security-specific mount
233 * options cleanly (a filesystem may modify the data e.g. with strsep()).
234 * This also allows the original mount data to be stripped of security-
235 * specific options to avoid having to make filesystems aware of them.
236 * @type the type of filesystem being mounted.
237 * @orig the original mount data copied from userspace.
238 * @copy copied data which will be passed to the security module.
239 * Returns 0 if the copy was successful.
240 * @sb_check_sb:
241 * Check permission before the device with superblock @mnt->sb is mounted
242 * on the mount point named by @nd.
243 * @mnt contains the vfsmount for device being mounted.
244 * @path contains the path for the mount point.
245 * Return 0 if permission is granted.
246 * @sb_umount:
247 * Check permission before the @mnt file system is unmounted.
248 * @mnt contains the mounted file system.
249 * @flags contains the unmount flags, e.g. MNT_FORCE.
250 * Return 0 if permission is granted.
251 * @sb_umount_close:
252 * Close any files in the @mnt mounted filesystem that are held open by
253 * the security module. This hook is called during an umount operation
254 * prior to checking whether the filesystem is still busy.
255 * @mnt contains the mounted filesystem.
256 * @sb_umount_busy:
257 * Handle a failed umount of the @mnt mounted filesystem, e.g. re-opening
258 * any files that were closed by umount_close. This hook is called during
259 * an umount operation if the umount fails after a call to the
260 * umount_close hook.
261 * @mnt contains the mounted filesystem.
262 * @sb_post_remount:
263 * Update the security module's state when a filesystem is remounted.
264 * This hook is only called if the remount was successful.
265 * @mnt contains the mounted file system.
266 * @flags contains the new filesystem flags.
267 * @data contains the filesystem-specific data.
268 * @sb_post_addmount:
269 * Update the security module's state when a filesystem is mounted.
270 * This hook is called any time a mount is successfully grafetd to
271 * the tree.
272 * @mnt contains the mounted filesystem.
273 * @mountpoint contains the path for the mount point.
274 * @sb_pivotroot:
275 * Check permission before pivoting the root filesystem.
276 * @old_path contains the path for the new location of the current root (put_old).
277 * @new_path contains the path for the new root (new_root).
278 * Return 0 if permission is granted.
279 * @sb_post_pivotroot:
280 * Update module state after a successful pivot.
281 * @old_path contains the path for the old root.
282 * @new_path contains the path for the new root.
283 * @sb_set_mnt_opts:
284 * Set the security relevant mount options used for a superblock
285 * @sb the superblock to set security mount options for
286 * @opts binary data structure containing all lsm mount data
287 * @sb_clone_mnt_opts:
288 * Copy all security options from a given superblock to another
289 * @oldsb old superblock which contain information to clone
290 * @newsb new superblock which needs filled in
291 * @sb_parse_opts_str:
292 * Parse a string of security data filling in the opts structure
293 * @options string containing all mount options known by the LSM
294 * @opts binary data structure usable by the LSM
295 *
296 * Security hooks for inode operations.
297 *
298 * @inode_alloc_security:
299 * Allocate and attach a security structure to @inode->i_security. The
300 * i_security field is initialized to NULL when the inode structure is
301 * allocated.
302 * @inode contains the inode structure.
303 * Return 0 if operation was successful.
304 * @inode_free_security:
305 * @inode contains the inode structure.
306 * Deallocate the inode security structure and set @inode->i_security to
307 * NULL.
308 * @inode_init_security:
309 * Obtain the security attribute name suffix and value to set on a newly
310 * created inode and set up the incore security field for the new inode.
311 * This hook is called by the fs code as part of the inode creation
312 * transaction and provides for atomic labeling of the inode, unlike
313 * the post_create/mkdir/... hooks called by the VFS. The hook function
314 * is expected to allocate the name and value via kmalloc, with the caller
315 * being responsible for calling kfree after using them.
316 * If the security module does not use security attributes or does
317 * not wish to put a security attribute on this particular inode,
318 * then it should return -EOPNOTSUPP to skip this processing.
319 * @inode contains the inode structure of the newly created inode.
320 * @dir contains the inode structure of the parent directory.
321 * @name will be set to the allocated name suffix (e.g. selinux).
322 * @value will be set to the allocated attribute value.
323 * @len will be set to the length of the value.
324 * Returns 0 if @name and @value have been successfully set,
325 * -EOPNOTSUPP if no security attribute is needed, or
326 * -ENOMEM on memory allocation failure.
327 * @inode_create:
328 * Check permission to create a regular file.
329 * @dir contains inode structure of the parent of the new file.
330 * @dentry contains the dentry structure for the file to be created.
331 * @mode contains the file mode of the file to be created.
332 * Return 0 if permission is granted.
333 * @inode_link:
334 * Check permission before creating a new hard link to a file.
335 * @old_dentry contains the dentry structure for an existing link to the file.
336 * @dir contains the inode structure of the parent directory of the new link.
337 * @new_dentry contains the dentry structure for the new link.
338 * Return 0 if permission is granted.
339 * @path_link:
340 * Check permission before creating a new hard link to a file.
341 * @old_dentry contains the dentry structure for an existing link
342 * to the file.
343 * @new_dir contains the path structure of the parent directory of
344 * the new link.
345 * @new_dentry contains the dentry structure for the new link.
346 * Return 0 if permission is granted.
347 * @inode_unlink:
348 * Check the permission to remove a hard link to a file.
349 * @dir contains the inode structure of parent directory of the file.
350 * @dentry contains the dentry structure for file to be unlinked.
351 * Return 0 if permission is granted.
352 * @path_unlink:
353 * Check the permission to remove a hard link to a file.
354 * @dir contains the path structure of parent directory of the file.
355 * @dentry contains the dentry structure for file to be unlinked.
356 * Return 0 if permission is granted.
357 * @inode_symlink:
358 * Check the permission to create a symbolic link to a file.
359 * @dir contains the inode structure of parent directory of the symbolic link.
360 * @dentry contains the dentry structure of the symbolic link.
361 * @old_name contains the pathname of file.
362 * Return 0 if permission is granted.
363 * @path_symlink:
364 * Check the permission to create a symbolic link to a file.
365 * @dir contains the path structure of parent directory of
366 * the symbolic link.
367 * @dentry contains the dentry structure of the symbolic link.
368 * @old_name contains the pathname of file.
369 * Return 0 if permission is granted.
370 * @inode_mkdir:
371 * Check permissions to create a new directory in the existing directory
372 * associated with inode strcture @dir.
373 * @dir containst the inode structure of parent of the directory to be created.
374 * @dentry contains the dentry structure of new directory.
375 * @mode contains the mode of new directory.
376 * Return 0 if permission is granted.
377 * @path_mkdir:
378 * Check permissions to create a new directory in the existing directory
379 * associated with path strcture @path.
380 * @dir containst the path structure of parent of the directory
381 * to be created.
382 * @dentry contains the dentry structure of new directory.
383 * @mode contains the mode of new directory.
384 * Return 0 if permission is granted.
385 * @inode_rmdir:
386 * Check the permission to remove a directory.
387 * @dir contains the inode structure of parent of the directory to be removed.
388 * @dentry contains the dentry structure of directory to be removed.
389 * Return 0 if permission is granted.
390 * @path_rmdir:
391 * Check the permission to remove a directory.
392 * @dir contains the path structure of parent of the directory to be
393 * removed.
394 * @dentry contains the dentry structure of directory to be removed.
395 * Return 0 if permission is granted.
396 * @inode_mknod:
397 * Check permissions when creating a special file (or a socket or a fifo
398 * file created via the mknod system call). Note that if mknod operation
399 * is being done for a regular file, then the create hook will be called
400 * and not this hook.
401 * @dir contains the inode structure of parent of the new file.
402 * @dentry contains the dentry structure of the new file.
403 * @mode contains the mode of the new file.
404 * @dev contains the device number.
405 * Return 0 if permission is granted.
406 * @path_mknod:
407 * Check permissions when creating a file. Note that this hook is called
408 * even if mknod operation is being done for a regular file.
409 * @dir contains the path structure of parent of the new file.
410 * @dentry contains the dentry structure of the new file.
411 * @mode contains the mode of the new file.
412 * @dev contains the undecoded device number. Use new_decode_dev() to get
413 * the decoded device number.
414 * Return 0 if permission is granted.
415 * @inode_rename:
416 * Check for permission to rename a file or directory.
417 * @old_dir contains the inode structure for parent of the old link.
418 * @old_dentry contains the dentry structure of the old link.
419 * @new_dir contains the inode structure for parent of the new link.
420 * @new_dentry contains the dentry structure of the new link.
421 * Return 0 if permission is granted.
422 * @path_rename:
423 * Check for permission to rename a file or directory.
424 * @old_dir contains the path structure for parent of the old link.
425 * @old_dentry contains the dentry structure of the old link.
426 * @new_dir contains the path structure for parent of the new link.
427 * @new_dentry contains the dentry structure of the new link.
428 * Return 0 if permission is granted.
429 * @inode_readlink:
430 * Check the permission to read the symbolic link.
431 * @dentry contains the dentry structure for the file link.
432 * Return 0 if permission is granted.
433 * @inode_follow_link:
434 * Check permission to follow a symbolic link when looking up a pathname.
435 * @dentry contains the dentry structure for the link.
436 * @nd contains the nameidata structure for the parent directory.
437 * Return 0 if permission is granted.
438 * @inode_permission:
439 * Check permission before accessing an inode. This hook is called by the
440 * existing Linux permission function, so a security module can use it to
441 * provide additional checking for existing Linux permission checks.
442 * Notice that this hook is called when a file is opened (as well as many
443 * other operations), whereas the file_security_ops permission hook is
444 * called when the actual read/write operations are performed.
445 * @inode contains the inode structure to check.
446 * @mask contains the permission mask.
447 * @nd contains the nameidata (may be NULL).
448 * Return 0 if permission is granted.
449 * @inode_setattr:
450 * Check permission before setting file attributes. Note that the kernel
451 * call to notify_change is performed from several locations, whenever
452 * file attributes change (such as when a file is truncated, chown/chmod
453 * operations, transferring disk quotas, etc).
454 * @dentry contains the dentry structure for the file.
455 * @attr is the iattr structure containing the new file attributes.
456 * Return 0 if permission is granted.
457 * @path_truncate:
458 * Check permission before truncating a file.
459 * @path contains the path structure for the file.
460 * @length is the new length of the file.
461 * @time_attrs is the flags passed to do_truncate().
462 * Return 0 if permission is granted.
463 * @inode_getattr:
464 * Check permission before obtaining file attributes.
465 * @mnt is the vfsmount where the dentry was looked up
466 * @dentry contains the dentry structure for the file.
467 * Return 0 if permission is granted.
468 * @inode_delete:
469 * @inode contains the inode structure for deleted inode.
470 * This hook is called when a deleted inode is released (i.e. an inode
471 * with no hard links has its use count drop to zero). A security module
472 * can use this hook to release any persistent label associated with the
473 * inode.
474 * @inode_setxattr:
475 * Check permission before setting the extended attributes
476 * @value identified by @name for @dentry.
477 * Return 0 if permission is granted.
478 * @inode_post_setxattr:
479 * Update inode security field after successful setxattr operation.
480 * @value identified by @name for @dentry.
481 * @inode_getxattr:
482 * Check permission before obtaining the extended attributes
483 * identified by @name for @dentry.
484 * Return 0 if permission is granted.
485 * @inode_listxattr:
486 * Check permission before obtaining the list of extended attribute
487 * names for @dentry.
488 * Return 0 if permission is granted.
489 * @inode_removexattr:
490 * Check permission before removing the extended attribute
491 * identified by @name for @dentry.
492 * Return 0 if permission is granted.
493 * @inode_getsecurity:
494 * Retrieve a copy of the extended attribute representation of the
495 * security label associated with @name for @inode via @buffer. Note that
496 * @name is the remainder of the attribute name after the security prefix
497 * has been removed. @alloc is used to specify of the call should return a
498 * value via the buffer or just the value length Return size of buffer on
499 * success.
500 * @inode_setsecurity:
501 * Set the security label associated with @name for @inode from the
502 * extended attribute value @value. @size indicates the size of the
503 * @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
504 * Note that @name is the remainder of the attribute name after the
505 * security. prefix has been removed.
506 * Return 0 on success.
507 * @inode_listsecurity:
508 * Copy the extended attribute names for the security labels
509 * associated with @inode into @buffer. The maximum size of @buffer
510 * is specified by @buffer_size. @buffer may be NULL to request
511 * the size of the buffer required.
512 * Returns number of bytes used/required on success.
513 * @inode_need_killpriv:
514 * Called when an inode has been changed.
515 * @dentry is the dentry being changed.
516 * Return <0 on error to abort the inode change operation.
517 * Return 0 if inode_killpriv does not need to be called.
518 * Return >0 if inode_killpriv does need to be called.
519 * @inode_killpriv:
520 * The setuid bit is being removed. Remove similar security labels.
521 * Called with the dentry->d_inode->i_mutex held.
522 * @dentry is the dentry being changed.
523 * Return 0 on success. If error is returned, then the operation
524 * causing setuid bit removal is failed.
525 * @inode_getsecid:
526 * Get the secid associated with the node.
527 * @inode contains a pointer to the inode.
528 * @secid contains a pointer to the location where result will be saved.
529 * In case of failure, @secid will be set to zero.
530 *
531 * Security hooks for file operations
532 *
533 * @file_permission:
534 * Check file permissions before accessing an open file. This hook is
535 * called by various operations that read or write files. A security
536 * module can use this hook to perform additional checking on these
537 * operations, e.g. to revalidate permissions on use to support privilege
538 * bracketing or policy changes. Notice that this hook is used when the
539 * actual read/write operations are performed, whereas the
540 * inode_security_ops hook is called when a file is opened (as well as
541 * many other operations).
542 * Caveat: Although this hook can be used to revalidate permissions for
543 * various system call operations that read or write files, it does not
544 * address the revalidation of permissions for memory-mapped files.
545 * Security modules must handle this separately if they need such
546 * revalidation.
547 * @file contains the file structure being accessed.
548 * @mask contains the requested permissions.
549 * Return 0 if permission is granted.
550 * @file_alloc_security:
551 * Allocate and attach a security structure to the file->f_security field.
552 * The security field is initialized to NULL when the structure is first
553 * created.
554 * @file contains the file structure to secure.
555 * Return 0 if the hook is successful and permission is granted.
556 * @file_free_security:
557 * Deallocate and free any security structures stored in file->f_security.
558 * @file contains the file structure being modified.
559 * @file_ioctl:
560 * @file contains the file structure.
561 * @cmd contains the operation to perform.
562 * @arg contains the operational arguments.
563 * Check permission for an ioctl operation on @file. Note that @arg can
564 * sometimes represents a user space pointer; in other cases, it may be a
565 * simple integer value. When @arg represents a user space pointer, it
566 * should never be used by the security module.
567 * Return 0 if permission is granted.
568 * @file_mmap :
569 * Check permissions for a mmap operation. The @file may be NULL, e.g.
570 * if mapping anonymous memory.
571 * @file contains the file structure for file to map (may be NULL).
572 * @reqprot contains the protection requested by the application.
573 * @prot contains the protection that will be applied by the kernel.
574 * @flags contains the operational flags.
575 * Return 0 if permission is granted.
576 * @file_mprotect:
577 * Check permissions before changing memory access permissions.
578 * @vma contains the memory region to modify.
579 * @reqprot contains the protection requested by the application.
580 * @prot contains the protection that will be applied by the kernel.
581 * Return 0 if permission is granted.
582 * @file_lock:
583 * Check permission before performing file locking operations.
584 * Note: this hook mediates both flock and fcntl style locks.
585 * @file contains the file structure.
586 * @cmd contains the posix-translated lock operation to perform
587 * (e.g. F_RDLCK, F_WRLCK).
588 * Return 0 if permission is granted.
589 * @file_fcntl:
590 * Check permission before allowing the file operation specified by @cmd
591 * from being performed on the file @file. Note that @arg can sometimes
592 * represents a user space pointer; in other cases, it may be a simple
593 * integer value. When @arg represents a user space pointer, it should
594 * never be used by the security module.
595 * @file contains the file structure.
596 * @cmd contains the operation to be performed.
597 * @arg contains the operational arguments.
598 * Return 0 if permission is granted.
599 * @file_set_fowner:
600 * Save owner security information (typically from current->security) in
601 * file->f_security for later use by the send_sigiotask hook.
602 * @file contains the file structure to update.
603 * Return 0 on success.
604 * @file_send_sigiotask:
605 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
606 * process @tsk. Note that this hook is sometimes called from interrupt.
607 * Note that the fown_struct, @fown, is never outside the context of a
608 * struct file, so the file structure (and associated security information)
609 * can always be obtained:
610 * container_of(fown, struct file, f_owner)
611 * @tsk contains the structure of task receiving signal.
612 * @fown contains the file owner information.
613 * @sig is the signal that will be sent. When 0, kernel sends SIGIO.
614 * Return 0 if permission is granted.
615 * @file_receive:
616 * This hook allows security modules to control the ability of a process
617 * to receive an open file descriptor via socket IPC.
618 * @file contains the file structure being received.
619 * Return 0 if permission is granted.
620 *
621 * Security hook for dentry
622 *
623 * @dentry_open
624 * Save open-time permission checking state for later use upon
625 * file_permission, and recheck access if anything has changed
626 * since inode_permission.
627 *
628 * Security hooks for task operations.
629 *
630 * @task_create:
631 * Check permission before creating a child process. See the clone(2)
632 * manual page for definitions of the @clone_flags.
633 * @clone_flags contains the flags indicating what should be shared.
634 * Return 0 if permission is granted.
635 * @cred_free:
636 * @cred points to the credentials.
637 * Deallocate and clear the cred->security field in a set of credentials.
638 * @cred_prepare:
639 * @new points to the new credentials.
640 * @old points to the original credentials.
641 * @gfp indicates the atomicity of any memory allocations.
642 * Prepare a new set of credentials by copying the data from the old set.
643 * @cred_commit:
644 * @new points to the new credentials.
645 * @old points to the original credentials.
646 * Install a new set of credentials.
647 * @kernel_act_as:
648 * Set the credentials for a kernel service to act as (subjective context).
649 * @new points to the credentials to be modified.
650 * @secid specifies the security ID to be set
651 * The current task must be the one that nominated @secid.
652 * Return 0 if successful.
653 * @kernel_create_files_as:
654 * Set the file creation context in a set of credentials to be the same as
655 * the objective context of the specified inode.
656 * @new points to the credentials to be modified.
657 * @inode points to the inode to use as a reference.
658 * The current task must be the one that nominated @inode.
659 * Return 0 if successful.
660 * @task_setuid:
661 * Check permission before setting one or more of the user identity
662 * attributes of the current process. The @flags parameter indicates
663 * which of the set*uid system calls invoked this hook and how to
664 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
665 * definitions at the beginning of this file for the @flags values and
666 * their meanings.
667 * @id0 contains a uid.
668 * @id1 contains a uid.
669 * @id2 contains a uid.
670 * @flags contains one of the LSM_SETID_* values.
671 * Return 0 if permission is granted.
672 * @task_fix_setuid:
673 * Update the module's state after setting one or more of the user
674 * identity attributes of the current process. The @flags parameter
675 * indicates which of the set*uid system calls invoked this hook. If
676 * @new is the set of credentials that will be installed. Modifications
677 * should be made to this rather than to @current->cred.
678 * @old is the set of credentials that are being replaces
679 * @flags contains one of the LSM_SETID_* values.
680 * Return 0 on success.
681 * @task_setgid:
682 * Check permission before setting one or more of the group identity
683 * attributes of the current process. The @flags parameter indicates
684 * which of the set*gid system calls invoked this hook and how to
685 * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
686 * definitions at the beginning of this file for the @flags values and
687 * their meanings.
688 * @id0 contains a gid.
689 * @id1 contains a gid.
690 * @id2 contains a gid.
691 * @flags contains one of the LSM_SETID_* values.
692 * Return 0 if permission is granted.
693 * @task_setpgid:
694 * Check permission before setting the process group identifier of the
695 * process @p to @pgid.
696 * @p contains the task_struct for process being modified.
697 * @pgid contains the new pgid.
698 * Return 0 if permission is granted.
699 * @task_getpgid:
700 * Check permission before getting the process group identifier of the
701 * process @p.
702 * @p contains the task_struct for the process.
703 * Return 0 if permission is granted.
704 * @task_getsid:
705 * Check permission before getting the session identifier of the process
706 * @p.
707 * @p contains the task_struct for the process.
708 * Return 0 if permission is granted.
709 * @task_getsecid:
710 * Retrieve the security identifier of the process @p.
711 * @p contains the task_struct for the process and place is into @secid.
712 * In case of failure, @secid will be set to zero.
713 *
714 * @task_setgroups:
715 * Check permission before setting the supplementary group set of the
716 * current process.
717 * @group_info contains the new group information.
718 * Return 0 if permission is granted.
719 * @task_setnice:
720 * Check permission before setting the nice value of @p to @nice.
721 * @p contains the task_struct of process.
722 * @nice contains the new nice value.
723 * Return 0 if permission is granted.
724 * @task_setioprio
725 * Check permission before setting the ioprio value of @p to @ioprio.
726 * @p contains the task_struct of process.
727 * @ioprio contains the new ioprio value
728 * Return 0 if permission is granted.
729 * @task_getioprio
730 * Check permission before getting the ioprio value of @p.
731 * @p contains the task_struct of process.
732 * Return 0 if permission is granted.
733 * @task_setrlimit:
734 * Check permission before setting the resource limits of the current
735 * process for @resource to @new_rlim. The old resource limit values can
736 * be examined by dereferencing (current->signal->rlim + resource).
737 * @resource contains the resource whose limit is being set.
738 * @new_rlim contains the new limits for @resource.
739 * Return 0 if permission is granted.
740 * @task_setscheduler:
741 * Check permission before setting scheduling policy and/or parameters of
742 * process @p based on @policy and @lp.
743 * @p contains the task_struct for process.
744 * @policy contains the scheduling policy.
745 * @lp contains the scheduling parameters.
746 * Return 0 if permission is granted.
747 * @task_getscheduler:
748 * Check permission before obtaining scheduling information for process
749 * @p.
750 * @p contains the task_struct for process.
751 * Return 0 if permission is granted.
752 * @task_movememory
753 * Check permission before moving memory owned by process @p.
754 * @p contains the task_struct for process.
755 * Return 0 if permission is granted.
756 * @task_kill:
757 * Check permission before sending signal @sig to @p. @info can be NULL,
758 * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
759 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
760 * from the kernel and should typically be permitted.
761 * SIGIO signals are handled separately by the send_sigiotask hook in
762 * file_security_ops.
763 * @p contains the task_struct for process.
764 * @info contains the signal information.
765 * @sig contains the signal value.
766 * @secid contains the sid of the process where the signal originated
767 * Return 0 if permission is granted.
768 * @task_wait:
769 * Check permission before allowing a process to reap a child process @p
770 * and collect its status information.
771 * @p contains the task_struct for process.
772 * Return 0 if permission is granted.
773 * @task_prctl:
774 * Check permission before performing a process control operation on the
775 * current process.
776 * @option contains the operation.
777 * @arg2 contains a argument.
778 * @arg3 contains a argument.
779 * @arg4 contains a argument.
780 * @arg5 contains a argument.
781 * Return -ENOSYS if no-one wanted to handle this op, any other value to
782 * cause prctl() to return immediately with that value.
783 * @task_to_inode:
784 * Set the security attributes for an inode based on an associated task's
785 * security attributes, e.g. for /proc/pid inodes.
786 * @p contains the task_struct for the task.
787 * @inode contains the inode structure for the inode.
788 *
789 * Security hooks for Netlink messaging.
790 *
791 * @netlink_send:
792 * Save security information for a netlink message so that permission
793 * checking can be performed when the message is processed. The security
794 * information can be saved using the eff_cap field of the
795 * netlink_skb_parms structure. Also may be used to provide fine
796 * grained control over message transmission.
797 * @sk associated sock of task sending the message.,
798 * @skb contains the sk_buff structure for the netlink message.
799 * Return 0 if the information was successfully saved and message
800 * is allowed to be transmitted.
801 * @netlink_recv:
802 * Check permission before processing the received netlink message in
803 * @skb.
804 * @skb contains the sk_buff structure for the netlink message.
805 * @cap indicates the capability required
806 * Return 0 if permission is granted.
807 *
808 * Security hooks for Unix domain networking.
809 *
810 * @unix_stream_connect:
811 * Check permissions before establishing a Unix domain stream connection
812 * between @sock and @other.
813 * @sock contains the socket structure.
814 * @other contains the peer socket structure.
815 * Return 0 if permission is granted.
816 * @unix_may_send:
817 * Check permissions before connecting or sending datagrams from @sock to
818 * @other.
819 * @sock contains the socket structure.
820 * @sock contains the peer socket structure.
821 * Return 0 if permission is granted.
822 *
823 * The @unix_stream_connect and @unix_may_send hooks were necessary because
824 * Linux provides an alternative to the conventional file name space for Unix
825 * domain sockets. Whereas binding and connecting to sockets in the file name
826 * space is mediated by the typical file permissions (and caught by the mknod
827 * and permission hooks in inode_security_ops), binding and connecting to
828 * sockets in the abstract name space is completely unmediated. Sufficient
829 * control of Unix domain sockets in the abstract name space isn't possible
830 * using only the socket layer hooks, since we need to know the actual target
831 * socket, which is not looked up until we are inside the af_unix code.
832 *
833 * Security hooks for socket operations.
834 *
835 * @socket_create:
836 * Check permissions prior to creating a new socket.
837 * @family contains the requested protocol family.
838 * @type contains the requested communications type.
839 * @protocol contains the requested protocol.
840 * @kern set to 1 if a kernel socket.
841 * Return 0 if permission is granted.
842 * @socket_post_create:
843 * This hook allows a module to update or allocate a per-socket security
844 * structure. Note that the security field was not added directly to the
845 * socket structure, but rather, the socket security information is stored
846 * in the associated inode. Typically, the inode alloc_security hook will
847 * allocate and and attach security information to
848 * sock->inode->i_security. This hook may be used to update the
849 * sock->inode->i_security field with additional information that wasn't
850 * available when the inode was allocated.
851 * @sock contains the newly created socket structure.
852 * @family contains the requested protocol family.
853 * @type contains the requested communications type.
854 * @protocol contains the requested protocol.
855 * @kern set to 1 if a kernel socket.
856 * @socket_bind:
857 * Check permission before socket protocol layer bind operation is
858 * performed and the socket @sock is bound to the address specified in the
859 * @address parameter.
860 * @sock contains the socket structure.
861 * @address contains the address to bind to.
862 * @addrlen contains the length of address.
863 * Return 0 if permission is granted.
864 * @socket_connect:
865 * Check permission before socket protocol layer connect operation
866 * attempts to connect socket @sock to a remote address, @address.
867 * @sock contains the socket structure.
868 * @address contains the address of remote endpoint.
869 * @addrlen contains the length of address.
870 * Return 0 if permission is granted.
871 * @socket_listen:
872 * Check permission before socket protocol layer listen operation.
873 * @sock contains the socket structure.
874 * @backlog contains the maximum length for the pending connection queue.
875 * Return 0 if permission is granted.
876 * @socket_accept:
877 * Check permission before accepting a new connection. Note that the new
878 * socket, @newsock, has been created and some information copied to it,
879 * but the accept operation has not actually been performed.
880 * @sock contains the listening socket structure.
881 * @newsock contains the newly created server socket for connection.
882 * Return 0 if permission is granted.
883 * @socket_post_accept:
884 * This hook allows a security module to copy security
885 * information into the newly created socket's inode.
886 * @sock contains the listening socket structure.
887 * @newsock contains the newly created server socket for connection.
888 * @socket_sendmsg:
889 * Check permission before transmitting a message to another socket.
890 * @sock contains the socket structure.
891 * @msg contains the message to be transmitted.
892 * @size contains the size of message.
893 * Return 0 if permission is granted.
894 * @socket_recvmsg:
895 * Check permission before receiving a message from a socket.
896 * @sock contains the socket structure.
897 * @msg contains the message structure.
898 * @size contains the size of message structure.
899 * @flags contains the operational flags.
900 * Return 0 if permission is granted.
901 * @socket_getsockname:
902 * Check permission before the local address (name) of the socket object
903 * @sock is retrieved.
904 * @sock contains the socket structure.
905 * Return 0 if permission is granted.
906 * @socket_getpeername:
907 * Check permission before the remote address (name) of a socket object
908 * @sock is retrieved.
909 * @sock contains the socket structure.
910 * Return 0 if permission is granted.
911 * @socket_getsockopt:
912 * Check permissions before retrieving the options associated with socket
913 * @sock.
914 * @sock contains the socket structure.
915 * @level contains the protocol level to retrieve option from.
916 * @optname contains the name of option to retrieve.
917 * Return 0 if permission is granted.
918 * @socket_setsockopt:
919 * Check permissions before setting the options associated with socket
920 * @sock.
921 * @sock contains the socket structure.
922 * @level contains the protocol level to set options for.
923 * @optname contains the name of the option to set.
924 * Return 0 if permission is granted.
925 * @socket_shutdown:
926 * Checks permission before all or part of a connection on the socket
927 * @sock is shut down.
928 * @sock contains the socket structure.
929 * @how contains the flag indicating how future sends and receives are handled.
930 * Return 0 if permission is granted.
931 * @socket_sock_rcv_skb:
932 * Check permissions on incoming network packets. This hook is distinct
933 * from Netfilter's IP input hooks since it is the first time that the
934 * incoming sk_buff @skb has been associated with a particular socket, @sk.
935 * @sk contains the sock (not socket) associated with the incoming sk_buff.
936 * @skb contains the incoming network data.
937 * @socket_getpeersec_stream:
938 * This hook allows the security module to provide peer socket security
939 * state for unix or connected tcp sockets to userspace via getsockopt
940 * SO_GETPEERSEC. For tcp sockets this can be meaningful if the
941 * socket is associated with an ipsec SA.
942 * @sock is the local socket.
943 * @optval userspace memory where the security state is to be copied.
944 * @optlen userspace int where the module should copy the actual length
945 * of the security state.
946 * @len as input is the maximum length to copy to userspace provided
947 * by the caller.
948 * Return 0 if all is well, otherwise, typical getsockopt return
949 * values.
950 * @socket_getpeersec_dgram:
951 * This hook allows the security module to provide peer socket security
952 * state for udp sockets on a per-packet basis to userspace via
953 * getsockopt SO_GETPEERSEC. The application must first have indicated
954 * the IP_PASSSEC option via getsockopt. It can then retrieve the
955 * security state returned by this hook for a packet via the SCM_SECURITY
956 * ancillary message type.
957 * @skb is the skbuff for the packet being queried
958 * @secdata is a pointer to a buffer in which to copy the security data
959 * @seclen is the maximum length for @secdata
960 * Return 0 on success, error on failure.
961 * @sk_alloc_security:
962 * Allocate and attach a security structure to the sk->sk_security field,
963 * which is used to copy security attributes between local stream sockets.
964 * @sk_free_security:
965 * Deallocate security structure.
966 * @sk_clone_security:
967 * Clone/copy security structure.
968 * @sk_getsecid:
969 * Retrieve the LSM-specific secid for the sock to enable caching of network
970 * authorizations.
971 * @sock_graft:
972 * Sets the socket's isec sid to the sock's sid.
973 * @inet_conn_request:
974 * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
975 * @inet_csk_clone:
976 * Sets the new child socket's sid to the openreq sid.
977 * @inet_conn_established:
978 * Sets the connection's peersid to the secmark on skb.
979 * @req_classify_flow:
980 * Sets the flow's sid to the openreq sid.
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_may_access:
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_may_access
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 * @acct:
1263 * Check permission before enabling or disabling process accounting. If
1264 * accounting is being enabled, then @file refers to the open file used to
1265 * store accounting records. If accounting is being disabled, then @file
1266 * is NULL.
1267 * @file contains the file structure for the accounting file (may be NULL).
1268 * Return 0 if permission is granted.
1269 * @sysctl:
1270 * Check permission before accessing the @table sysctl variable in the
1271 * manner specified by @op.
1272 * @table contains the ctl_table structure for the sysctl variable.
1273 * @op contains the operation (001 = search, 002 = write, 004 = read).
1274 * Return 0 if permission is granted.
1275 * @syslog:
1276 * Check permission before accessing the kernel message ring or changing
1277 * logging to the console.
1278 * See the syslog(2) manual page for an explanation of the @type values.
1279 * @type contains the type of action.
1280 * Return 0 if permission is granted.
1281 * @settime:
1282 * Check permission to change the system time.
1283 * struct timespec and timezone are defined in include/linux/time.h
1284 * @ts contains new time
1285 * @tz contains new timezone
1286 * Return 0 if permission is granted.
1287 * @vm_enough_memory:
1288 * Check permissions for allocating a new virtual mapping.
1289 * @mm contains the mm struct it is being added to.
1290 * @pages contains the number of pages.
1291 * Return 0 if permission is granted.
1292 *
1293 * @secid_to_secctx:
1294 * Convert secid to security context.
1295 * @secid contains the security ID.
1296 * @secdata contains the pointer that stores the converted security context.
1297 * @secctx_to_secid:
1298 * Convert security context to secid.
1299 * @secid contains the pointer to the generated security ID.
1300 * @secdata contains the security context.
1301 *
1302 * @release_secctx:
1303 * Release the security context.
1304 * @secdata contains the security context.
1305 * @seclen contains the length of the security context.
1306 *
1307 * Security hooks for Audit
1308 *
1309 * @audit_rule_init:
1310 * Allocate and initialize an LSM audit rule structure.
1311 * @field contains the required Audit action. Fields flags are defined in include/linux/audit.h
1312 * @op contains the operator the rule uses.
1313 * @rulestr contains the context where the rule will be applied to.
1314 * @lsmrule contains a pointer to receive the result.
1315 * Return 0 if @lsmrule has been successfully set,
1316 * -EINVAL in case of an invalid rule.
1317 *
1318 * @audit_rule_known:
1319 * Specifies whether given @rule contains any fields related to current LSM.
1320 * @rule contains the audit rule of interest.
1321 * Return 1 in case of relation found, 0 otherwise.
1322 *
1323 * @audit_rule_match:
1324 * Determine if given @secid matches a rule previously approved
1325 * by @audit_rule_known.
1326 * @secid contains the security id in question.
1327 * @field contains the field which relates to current LSM.
1328 * @op contains the operator that will be used for matching.
1329 * @rule points to the audit rule that will be checked against.
1330 * @actx points to the audit context associated with the check.
1331 * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1332 *
1333 * @audit_rule_free:
1334 * Deallocate the LSM audit rule structure previously allocated by
1335 * audit_rule_init.
1336 * @rule contains the allocated rule
1337 *
1338 * This is the main security structure.
1339 */
1395 #ifdef CONFIG_SECURITY_PATH
1409 #endif
1443 int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
1444 int (*inode_setsecurity) (struct inode *inode, const char *name, const void *value, size_t size, int flags);
1472 gfp_t gfp);
1543 #ifdef CONFIG_SECURITY_NETWORK
1569 int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
1583 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1586 int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx);
1591 u32 secid);
1601 /* key management security hooks */
1602 #ifdef CONFIG_KEYS
1607 key_perm_t perm);
1611 #ifdef CONFIG_AUDIT
1618 };
1620 /* prototypes */
1625 /* Security operations */
1704 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
1705 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
1787 };
1790 {
1791 }
1794 {
1795 }
1797 /*
1798 * This is the default capabilities functionality. Most of these functions
1799 * are just stubbed out, but a few must call the proper capable code.
1800 */
1803 {
1805 }
1809 {
1811 }
1814 {
1816 }
1822 {
1824 }
1831 {
1833 }
1836 {
1838 }
1841 {
1848 }
1852 {
1857 SECURITY_CAP_NOAUDIT);
1860 }
1863 {
1865 }
1868 {
1870 }
1874 {
1876 }
1879 {
1881 }
1884 {
1886 }
1889 {
1891 }
1894 {
1897 }
1900 {
1903 }
1906 {
1907 /* If current->mm is a kernel thread then we will pass NULL,
1908 for this specific case that is fine */
1910 }
1913 {
1915 }
1918 {
1920 }
1923 {
1924 }
1927 {
1928 }
1931 {
1933 }
1936 {
1938 }
1941 { }
1944 {
1946 }
1949 {
1951 }
1955 {
1957 }
1960 {
1962 }
1967 {
1969 }
1973 {
1975 }
1978 {
1980 }
1983 { }
1986 { }
1990 { }
1994 { }
1998 {
2000 }
2004 { }
2008 {
2010 }
2014 { }
2017 {
2019 }
2022 {
2024 }
2027 { }
2034 {
2036 }
2041 {
2043 }
2048 {
2050 }
2054 {
2056 }
2061 {
2063 }
2068 {
2070 }
2074 {
2076 }
2081 {
2083 }
2089 {
2091 }
2094 {
2096 }
2100 {
2102 }
2105 {
2107 }
2111 {
2113 }
2117 {
2119 }
2122 { }
2126 {
2128 }
2132 { }
2136 {
2138 }
2141 {
2143 }
2147 {
2149 }
2152 {
2154 }
2157 {
2159 }
2161 static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2162 {
2164 }
2166 static inline int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
2167 {
2169 }
2171 static inline int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2172 {
2174 }
2177 {
2179 }
2182 {
2184 }
2187 {
2189 }
2192 { }
2196 {
2198 }
2205 {
2207 }
2212 {
2214 }
2217 {
2219 }
2223 {
2225 }
2228 {
2230 }
2235 {
2237 }
2240 {
2242 }
2246 {
2248 }
2251 {
2253 }
2256 { }
2260 gfp_t gfp)
2261 {
2263 }
2267 {
2268 }
2271 {
2273 }
2277 {
2279 }
2283 {
2285 }
2290 {
2292 }
2296 {
2298 }
2301 {
2303 }
2306 {
2308 }
2311 {
2313 }
2316 {
2318 }
2321 {
2323 }
2326 {
2328 }
2331 {
2333 }
2336 {
2338 }
2342 {
2344 }
2349 {
2351 }
2354 {
2356 }
2359 {
2361 }
2365 u32 secid)
2366 {
2368 }
2371 {
2373 }
2379 {
2381 }
2384 { }
2388 {
2390 }
2393 {
2395 }
2398 {
2400 }
2403 { }
2406 {
2408 }
2411 { }
2415 {
2417 }
2420 {
2422 }
2426 {
2428 }
2434 {
2436 }
2439 {
2441 }
2444 { }
2448 {
2450 }
2453 {
2455 }
2459 {
2461 }
2464 {
2466 }
2469 { }
2472 {
2474 }
2477 {
2479 }
2484 {
2486 }
2489 { }
2492 {
2494 }
2496 static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
2497 {
2499 }
2502 {
2504 }
2507 {
2509 }
2512 {
2514 }
2517 u32 seclen,
2519 {
2521 }
2524 {
2525 }
2528 #ifdef CONFIG_SECURITY_NETWORK
2570 {
2572 }
2576 {
2578 }
2582 {
2584 }
2590 {
2592 }
2597 {
2599 }
2604 {
2606 }
2609 {
2611 }
2615 {
2617 }
2621 {
2622 }
2626 {
2628 }
2633 {
2635 }
2638 {
2640 }
2643 {
2645 }
2649 {
2651 }
2655 {
2657 }
2660 {
2662 }
2665 {
2667 }
2671 {
2673 }
2675 static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
2676 {
2678 }
2681 {
2683 }
2686 {
2687 }
2690 {
2691 }
2694 {
2695 }
2697 static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
2698 {
2699 }
2702 {
2703 }
2707 {
2709 }
2713 {
2714 }
2718 {
2719 }
2722 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2741 static inline int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
2742 {
2744 }
2746 static inline int security_xfrm_policy_clone(struct xfrm_sec_ctx *old, struct xfrm_sec_ctx **new_ctxp)
2747 {
2749 }
2752 {
2753 }
2756 {
2758 }
2762 {
2764 }
2768 {
2770 }
2773 {
2774 }
2777 {
2779 }
2782 {
2784 }
2788 {
2790 }
2793 {
2795 }
2798 {
2799 }
2803 #ifdef CONFIG_SECURITY_PATH
2819 {
2821 }
2825 {
2827 }
2830 {
2832 }
2836 {
2838 }
2842 {
2844 }
2848 {
2850 }
2855 {
2857 }
2863 {
2865 }
2868 #ifdef CONFIG_KEYS
2869 #ifdef CONFIG_SECURITY
2877 #else
2882 {
2884 }
2887 {
2888 }
2892 key_perm_t perm)
2893 {
2895 }
2898 {
2901 }
2903 #endif
2906 #ifdef CONFIG_AUDIT
2907 #ifdef CONFIG_SECURITY
2914 #else
2918 {
2920 }
2923 {
2925 }
2929 {
2931 }
2934 { }
2939 #ifdef CONFIG_SECURITYFS
2951 {
2953 }
2956 mode_t mode,
2960 {
2962 }
2965 {}
2967 #endif