1 /*
2  * Linux Security Module interfaces
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  * Copyright (C) 2015 Intel Corporation.
10  * Copyright (C) 2015 Casey Schaufler <casey@schaufler-ca.com>
11  * Copyright (C) 2016 Mellanox Techonologies
12  *
13  *	This program is free software; you can redistribute it and/or modify
14  *	it under the terms of the GNU General Public License as published by
15  *	the Free Software Foundation; either version 2 of the License, or
16  *	(at your option) any later version.
17  *
18  *	Due to this file being licensed under the GPL there is controversy over
19  *	whether this permits you to write a module that #includes this file
20  *	without placing your module under the GPL.  Please consult a lawyer for
21  *	advice before doing this.
22  *
23  */
24 
25 #ifndef __LINUX_LSM_HOOKS_H
26 #define __LINUX_LSM_HOOKS_H
27 
28 #include <linux/security.h>
29 #include <linux/init.h>
30 #include <linux/rculist.h>
31 
32 /**
33  * union security_list_options - Linux Security Module hook function list
34  *
35  * Security hooks for program execution operations.
36  *
37  * @bprm_creds_for_exec:
38  *	If the setup in prepare_exec_creds did not setup @bprm->cred->security
39  *	properly for executing @bprm->file, update the LSM's portion of
40  *	@bprm->cred->security to be what commit_creds needs to install for the
41  *	new program.  This hook may also optionally check permissions
42  *	(e.g. for transitions between security domains).
43  *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
44  *	request libc enable secure mode.
45  *	@bprm contains the linux_binprm structure.
46  *	Return 0 if the hook is successful and permission is granted.
47  * @bprm_creds_from_file:
48  *	If @file is setpcap, suid, sgid or otherwise marked to change
49  *	privilege upon exec, update @bprm->cred to reflect that change.
50  *	This is called after finding the binary that will be executed.
51  *	without an interpreter.  This ensures that the credentials will not
52  *	be derived from a script that the binary will need to reopen, which
53  *	when reopend may end up being a completely different file.  This
54  *	hook may also optionally check permissions (e.g. for transitions
55  *	between security domains).
56  *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
57  *	request libc enable secure mode.
58  *	The hook must add to @bprm->per_clear any personality flags that
59  * 	should be cleared from current->personality.
60  *	@bprm contains the linux_binprm structure.
61  *	Return 0 if the hook is successful and permission is granted.
62  * @bprm_check_security:
63  *	This hook mediates the point when a search for a binary handler will
64  *	begin.  It allows a check against the @bprm->cred->security value
65  *	which was set in the preceding creds_for_exec call.  The argv list and
66  *	envp list are reliably available in @bprm.  This hook may be called
67  *	multiple times during a single execve.
68  *	@bprm contains the linux_binprm structure.
69  *	Return 0 if the hook is successful and permission is granted.
70  * @bprm_committing_creds:
71  *	Prepare to install the new security attributes of a process being
72  *	transformed by an execve operation, based on the old credentials
73  *	pointed to by @current->cred and the information set in @bprm->cred by
74  *	the bprm_creds_for_exec hook.  @bprm points to the linux_binprm
75  *	structure.  This hook is a good place to perform state changes on the
76  *	process such as closing open file descriptors to which access will no
77  *	longer be granted when the attributes are changed.  This is called
78  *	immediately before commit_creds().
79  * @bprm_committed_creds:
80  *	Tidy up after the installation of the new security attributes of a
81  *	process being transformed by an execve operation.  The new credentials
82  *	have, by this point, been set to @current->cred.  @bprm points to the
83  *	linux_binprm structure.  This hook is a good place to perform state
84  *	changes on the process such as clearing out non-inheritable signal
85  *	state.  This is called immediately after commit_creds().
86  *
87  * Security hooks for mount using fs_context.
88  *	[See also Documentation/filesystems/mount_api.rst]
89  *
90  * @fs_context_dup:
91  *	Allocate and attach a security structure to sc->security.  This pointer
92  *	is initialised to NULL by the caller.
93  *	@fc indicates the new filesystem context.
94  *	@src_fc indicates the original filesystem context.
95  * @fs_context_parse_param:
96  *	Userspace provided a parameter to configure a superblock.  The LSM may
97  *	reject it with an error and may use it for itself, in which case it
98  *	should return 0; otherwise it should return -ENOPARAM to pass it on to
99  *	the filesystem.
100  *	@fc indicates the filesystem context.
101  *	@param The parameter
102  *
103  * Security hooks for filesystem operations.
104  *
105  * @sb_alloc_security:
106  *	Allocate and attach a security structure to the sb->s_security field.
107  *	The s_security field is initialized to NULL when the structure is
108  *	allocated.
109  *	@sb contains the super_block structure to be modified.
110  *	Return 0 if operation was successful.
111  * @sb_delete:
112  *	Release objects tied to a superblock (e.g. inodes).
113  *	@sb contains the super_block structure being released.
114  * @sb_free_security:
115  *	Deallocate and clear the sb->s_security field.
116  *	@sb contains the super_block structure to be modified.
117  * @sb_free_mnt_opts:
118  * 	Free memory associated with @mnt_ops.
119  * @sb_eat_lsm_opts:
120  * 	Eat (scan @orig options) and save them in @mnt_opts.
121  * @sb_statfs:
122  *	Check permission before obtaining filesystem statistics for the @mnt
123  *	mountpoint.
124  *	@dentry is a handle on the superblock for the filesystem.
125  *	Return 0 if permission is granted.
126  * @sb_mount:
127  *	Check permission before an object specified by @dev_name is mounted on
128  *	the mount point named by @nd.  For an ordinary mount, @dev_name
129  *	identifies a device if the file system type requires a device.  For a
130  *	remount (@flags & MS_REMOUNT), @dev_name is irrelevant.  For a
131  *	loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
132  *	pathname of the object being mounted.
133  *	@dev_name contains the name for object being mounted.
134  *	@path contains the path for mount point object.
135  *	@type contains the filesystem type.
136  *	@flags contains the mount flags.
137  *	@data contains the filesystem-specific data.
138  *	Return 0 if permission is granted.
139  * @sb_copy_data:
140  *	Allow mount option data to be copied prior to parsing by the filesystem,
141  *	so that the security module can extract security-specific mount
142  *	options cleanly (a filesystem may modify the data e.g. with strsep()).
143  *	This also allows the original mount data to be stripped of security-
144  *	specific options to avoid having to make filesystems aware of them.
145  *	@orig the original mount data copied from userspace.
146  *	@copy copied data which will be passed to the security module.
147  *	Returns 0 if the copy was successful.
148  * @sb_mnt_opts_compat:
149  *	Determine if the new mount options in @mnt_opts are allowed given
150  *	the existing mounted filesystem at @sb.
151  *	@sb superblock being compared
152  *	@mnt_opts new mount options
153  *	Return 0 if options are compatible.
154  * @sb_remount:
155  *	Extracts security system specific mount options and verifies no changes
156  *	are being made to those options.
157  *	@sb superblock being remounted
158  *	@data contains the filesystem-specific data.
159  *	Return 0 if permission is granted.
160  * @sb_kern_mount:
161  * 	Mount this @sb if allowed by permissions.
162  * @sb_show_options:
163  * 	Show (print on @m) mount options for this @sb.
164  * @sb_umount:
165  *	Check permission before the @mnt file system is unmounted.
166  *	@mnt contains the mounted file system.
167  *	@flags contains the unmount flags, e.g. MNT_FORCE.
168  *	Return 0 if permission is granted.
169  * @sb_pivotroot:
170  *	Check permission before pivoting the root filesystem.
171  *	@old_path contains the path for the new location of the
172  *	current root (put_old).
173  *	@new_path contains the path for the new root (new_root).
174  *	Return 0 if permission is granted.
175  * @sb_set_mnt_opts:
176  *	Set the security relevant mount options used for a superblock
177  *	@sb the superblock to set security mount options for
178  *	@opts binary data structure containing all lsm mount data
179  * @sb_clone_mnt_opts:
180  *	Copy all security options from a given superblock to another
181  *	@oldsb old superblock which contain information to clone
182  *	@newsb new superblock which needs filled in
183  * @sb_add_mnt_opt:
184  * 	Add one mount @option to @mnt_opts.
185  * @sb_parse_opts_str:
186  *	Parse a string of security data filling in the opts structure
187  *	@options string containing all mount options known by the LSM
188  *	@opts binary data structure usable by the LSM
189  * @move_mount:
190  *	Check permission before a mount is moved.
191  *	@from_path indicates the mount that is going to be moved.
192  *	@to_path indicates the mountpoint that will be mounted upon.
193  * @dentry_init_security:
194  *	Compute a context for a dentry as the inode is not yet available
195  *	since NFSv4 has no label backed by an EA anyway.
196  *	@dentry dentry to use in calculating the context.
197  *	@mode mode used to determine resource type.
198  *	@name name of the last path component used to create file
199  *	@ctx pointer to place the pointer to the resulting context in.
200  *	@ctxlen point to place the length of the resulting context.
201  * @dentry_create_files_as:
202  *	Compute a context for a dentry as the inode is not yet available
203  *	and set that context in passed in creds so that new files are
204  *	created using that context. Context is calculated using the
205  *	passed in creds and not the creds of the caller.
206  *	@dentry dentry to use in calculating the context.
207  *	@mode mode used to determine resource type.
208  *	@name name of the last path component used to create file
209  *	@old creds which should be used for context calculation
210  *	@new creds to modify
211  *
212  *
213  * Security hooks for inode operations.
214  *
215  * @inode_alloc_security:
216  *	Allocate and attach a security structure to @inode->i_security.  The
217  *	i_security field is initialized to NULL when the inode structure is
218  *	allocated.
219  *	@inode contains the inode structure.
220  *	Return 0 if operation was successful.
221  * @inode_free_security:
222  *	@inode contains the inode structure.
223  *	Deallocate the inode security structure and set @inode->i_security to
224  *	NULL.
225  * @inode_init_security:
226  *	Obtain the security attribute name suffix and value to set on a newly
227  *	created inode and set up the incore security field for the new inode.
228  *	This hook is called by the fs code as part of the inode creation
229  *	transaction and provides for atomic labeling of the inode, unlike
230  *	the post_create/mkdir/... hooks called by the VFS.  The hook function
231  *	is expected to allocate the name and value via kmalloc, with the caller
232  *	being responsible for calling kfree after using them.
233  *	If the security module does not use security attributes or does
234  *	not wish to put a security attribute on this particular inode,
235  *	then it should return -EOPNOTSUPP to skip this processing.
236  *	@inode contains the inode structure of the newly created inode.
237  *	@dir contains the inode structure of the parent directory.
238  *	@qstr contains the last path component of the new object
239  *	@name will be set to the allocated name suffix (e.g. selinux).
240  *	@value will be set to the allocated attribute value.
241  *	@len will be set to the length of the value.
242  *	Returns 0 if @name and @value have been successfully set,
243  *	-EOPNOTSUPP if no security attribute is needed, or
244  *	-ENOMEM on memory allocation failure.
245  * @inode_init_security_anon:
246  *      Set up the incore security field for the new anonymous inode
247  *      and return whether the inode creation is permitted by the security
248  *      module or not.
249  *      @inode contains the inode structure
250  *      @name name of the anonymous inode class
251  *      @context_inode optional related inode
252  *	Returns 0 on success, -EACCES if the security module denies the
253  *	creation of this inode, or another -errno upon other errors.
254  * @inode_create:
255  *	Check permission to create a regular file.
256  *	@dir contains inode structure of the parent of the new file.
257  *	@dentry contains the dentry structure for the file to be created.
258  *	@mode contains the file mode of the file to be created.
259  *	Return 0 if permission is granted.
260  * @inode_link:
261  *	Check permission before creating a new hard link to a file.
262  *	@old_dentry contains the dentry structure for an existing
263  *	link to the file.
264  *	@dir contains the inode structure of the parent directory
265  *	of the new link.
266  *	@new_dentry contains the dentry structure for the new link.
267  *	Return 0 if permission is granted.
268  * @path_link:
269  *	Check permission before creating a new hard link to a file.
270  *	@old_dentry contains the dentry structure for an existing link
271  *	to the file.
272  *	@new_dir contains the path structure of the parent directory of
273  *	the new link.
274  *	@new_dentry contains the dentry structure for the new link.
275  *	Return 0 if permission is granted.
276  * @inode_unlink:
277  *	Check the permission to remove a hard link to a file.
278  *	@dir contains the inode structure of parent directory of the file.
279  *	@dentry contains the dentry structure for file to be unlinked.
280  *	Return 0 if permission is granted.
281  * @path_unlink:
282  *	Check the permission to remove a hard link to a file.
283  *	@dir contains the path structure of parent directory of the file.
284  *	@dentry contains the dentry structure for file to be unlinked.
285  *	Return 0 if permission is granted.
286  * @inode_symlink:
287  *	Check the permission to create a symbolic link to a file.
288  *	@dir contains the inode structure of parent directory of
289  *	the symbolic link.
290  *	@dentry contains the dentry structure of the symbolic link.
291  *	@old_name contains the pathname of file.
292  *	Return 0 if permission is granted.
293  * @path_symlink:
294  *	Check the permission to create a symbolic link to a file.
295  *	@dir contains the path structure of parent directory of
296  *	the symbolic link.
297  *	@dentry contains the dentry structure of the symbolic link.
298  *	@old_name contains the pathname of file.
299  *	Return 0 if permission is granted.
300  * @inode_mkdir:
301  *	Check permissions to create a new directory in the existing directory
302  *	associated with inode structure @dir.
303  *	@dir contains the inode structure of parent of the directory
304  *	to be created.
305  *	@dentry contains the dentry structure of new directory.
306  *	@mode contains the mode of new directory.
307  *	Return 0 if permission is granted.
308  * @path_mkdir:
309  *	Check permissions to create a new directory in the existing directory
310  *	associated with path structure @path.
311  *	@dir contains the path structure of parent of the directory
312  *	to be created.
313  *	@dentry contains the dentry structure of new directory.
314  *	@mode contains the mode of new directory.
315  *	Return 0 if permission is granted.
316  * @inode_rmdir:
317  *	Check the permission to remove a directory.
318  *	@dir contains the inode structure of parent of the directory
319  *	to be removed.
320  *	@dentry contains the dentry structure of directory to be removed.
321  *	Return 0 if permission is granted.
322  * @path_rmdir:
323  *	Check the permission to remove a directory.
324  *	@dir contains the path structure of parent of the directory to be
325  *	removed.
326  *	@dentry contains the dentry structure of directory to be removed.
327  *	Return 0 if permission is granted.
328  * @inode_mknod:
329  *	Check permissions when creating a special file (or a socket or a fifo
330  *	file created via the mknod system call).  Note that if mknod operation
331  *	is being done for a regular file, then the create hook will be called
332  *	and not this hook.
333  *	@dir contains the inode structure of parent of the new file.
334  *	@dentry contains the dentry structure of the new file.
335  *	@mode contains the mode of the new file.
336  *	@dev contains the device number.
337  *	Return 0 if permission is granted.
338  * @path_mknod:
339  *	Check permissions when creating a file. Note that this hook is called
340  *	even if mknod operation is being done for a regular file.
341  *	@dir contains the path structure of parent of the new file.
342  *	@dentry contains the dentry structure of the new file.
343  *	@mode contains the mode of the new file.
344  *	@dev contains the undecoded device number. Use new_decode_dev() to get
345  *	the decoded device number.
346  *	Return 0 if permission is granted.
347  * @inode_rename:
348  *	Check for permission to rename a file or directory.
349  *	@old_dir contains the inode structure for parent of the old link.
350  *	@old_dentry contains the dentry structure of the old link.
351  *	@new_dir contains the inode structure for parent of the new link.
352  *	@new_dentry contains the dentry structure of the new link.
353  *	Return 0 if permission is granted.
354  * @path_rename:
355  *	Check for permission to rename a file or directory.
356  *	@old_dir contains the path structure for parent of the old link.
357  *	@old_dentry contains the dentry structure of the old link.
358  *	@new_dir contains the path structure for parent of the new link.
359  *	@new_dentry contains the dentry structure of the new link.
360  *	Return 0 if permission is granted.
361  * @path_chmod:
362  *	Check for permission to change a mode of the file @path. The new
363  *	mode is specified in @mode.
364  *	@path contains the path structure of the file to change the mode.
365  *	@mode contains the new DAC's permission, which is a bitmask of
366  *	constants from <include/uapi/linux/stat.h>
367  *	Return 0 if permission is granted.
368  * @path_chown:
369  *	Check for permission to change owner/group of a file or directory.
370  *	@path contains the path structure.
371  *	@uid contains new owner's ID.
372  *	@gid contains new group's ID.
373  *	Return 0 if permission is granted.
374  * @path_chroot:
375  *	Check for permission to change root directory.
376  *	@path contains the path structure.
377  *	Return 0 if permission is granted.
378  * @path_notify:
379  *	Check permissions before setting a watch on events as defined by @mask,
380  *	on an object at @path, whose type is defined by @obj_type.
381  * @inode_readlink:
382  *	Check the permission to read the symbolic link.
383  *	@dentry contains the dentry structure for the file link.
384  *	Return 0 if permission is granted.
385  * @inode_follow_link:
386  *	Check permission to follow a symbolic link when looking up a pathname.
387  *	@dentry contains the dentry structure for the link.
388  *	@inode contains the inode, which itself is not stable in RCU-walk
389  *	@rcu indicates whether we are in RCU-walk mode.
390  *	Return 0 if permission is granted.
391  * @inode_permission:
392  *	Check permission before accessing an inode.  This hook is called by the
393  *	existing Linux permission function, so a security module can use it to
394  *	provide additional checking for existing Linux permission checks.
395  *	Notice that this hook is called when a file is opened (as well as many
396  *	other operations), whereas the file_security_ops permission hook is
397  *	called when the actual read/write operations are performed.
398  *	@inode contains the inode structure to check.
399  *	@mask contains the permission mask.
400  *	Return 0 if permission is granted.
401  * @inode_setattr:
402  *	Check permission before setting file attributes.  Note that the kernel
403  *	call to notify_change is performed from several locations, whenever
404  *	file attributes change (such as when a file is truncated, chown/chmod
405  *	operations, transferring disk quotas, etc).
406  *	@dentry contains the dentry structure for the file.
407  *	@attr is the iattr structure containing the new file attributes.
408  *	Return 0 if permission is granted.
409  * @path_truncate:
410  *	Check permission before truncating a file.
411  *	@path contains the path structure for the file.
412  *	Return 0 if permission is granted.
413  * @inode_getattr:
414  *	Check permission before obtaining file attributes.
415  *	@path contains the path structure for the file.
416  *	Return 0 if permission is granted.
417  * @inode_setxattr:
418  *	Check permission before setting the extended attributes
419  *	@value identified by @name for @dentry.
420  *	Return 0 if permission is granted.
421  * @inode_post_setxattr:
422  *	Update inode security field after successful setxattr operation.
423  *	@value identified by @name for @dentry.
424  * @inode_getxattr:
425  *	Check permission before obtaining the extended attributes
426  *	identified by @name for @dentry.
427  *	Return 0 if permission is granted.
428  * @inode_listxattr:
429  *	Check permission before obtaining the list of extended attribute
430  *	names for @dentry.
431  *	Return 0 if permission is granted.
432  * @inode_removexattr:
433  *	Check permission before removing the extended attribute
434  *	identified by @name for @dentry.
435  *	Return 0 if permission is granted.
436  * @inode_getsecurity:
437  *	Retrieve a copy of the extended attribute representation of the
438  *	security label associated with @name for @inode via @buffer.  Note that
439  *	@name is the remainder of the attribute name after the security prefix
440  *	has been removed. @alloc is used to specify of the call should return a
441  *	value via the buffer or just the value length Return size of buffer on
442  *	success.
443  * @inode_setsecurity:
444  *	Set the security label associated with @name for @inode from the
445  *	extended attribute value @value.  @size indicates the size of the
446  *	@value in bytes.  @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
447  *	Note that @name is the remainder of the attribute name after the
448  *	security. prefix has been removed.
449  *	Return 0 on success.
450  * @inode_listsecurity:
451  *	Copy the extended attribute names for the security labels
452  *	associated with @inode into @buffer.  The maximum size of @buffer
453  *	is specified by @buffer_size.  @buffer may be NULL to request
454  *	the size of the buffer required.
455  *	Returns number of bytes used/required on success.
456  * @inode_need_killpriv:
457  *	Called when an inode has been changed.
458  *	@dentry is the dentry being changed.
459  *	Return <0 on error to abort the inode change operation.
460  *	Return 0 if inode_killpriv does not need to be called.
461  *	Return >0 if inode_killpriv does need to be called.
462  * @inode_killpriv:
463  *	The setuid bit is being removed.  Remove similar security labels.
464  *	Called with the dentry->d_inode->i_mutex held.
465  *	@mnt_userns: user namespace of the mount
466  *	@dentry is the dentry being changed.
467  *	Return 0 on success.  If error is returned, then the operation
468  *	causing setuid bit removal is failed.
469  * @inode_getsecid:
470  *	Get the secid associated with the node.
471  *	@inode contains a pointer to the inode.
472  *	@secid contains a pointer to the location where result will be saved.
473  *	In case of failure, @secid will be set to zero.
474  * @inode_copy_up:
475  *	A file is about to be copied up from lower layer to upper layer of
476  *	overlay filesystem. Security module can prepare a set of new creds
477  *	and modify as need be and return new creds. Caller will switch to
478  *	new creds temporarily to create new file and release newly allocated
479  *	creds.
480  *	@src indicates the union dentry of file that is being copied up.
481  *	@new pointer to pointer to return newly allocated creds.
482  *	Returns 0 on success or a negative error code on error.
483  * @inode_copy_up_xattr:
484  *	Filter the xattrs being copied up when a unioned file is copied
485  *	up from a lower layer to the union/overlay layer.
486  *	@name indicates the name of the xattr.
487  *	Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP if
488  *	security module does not know about attribute or a negative error code
489  *	to abort the copy up. Note that the caller is responsible for reading
490  *	and writing the xattrs as this hook is merely a filter.
491  * @d_instantiate:
492  * 	Fill in @inode security information for a @dentry if allowed.
493  * @getprocattr:
494  * 	Read attribute @name for process @p and store it into @value if allowed.
495  * @setprocattr:
496  * 	Write (set) attribute @name to @value, size @size if allowed.
497  *
498  * Security hooks for kernfs node operations
499  *
500  * @kernfs_init_security:
501  *	Initialize the security context of a newly created kernfs node based
502  *	on its own and its parent's attributes.
503  *
504  *	@kn_dir the parent kernfs node
505  *	@kn the new child kernfs node
506  *
507  * Security hooks for file operations
508  *
509  * @file_permission:
510  *	Check file permissions before accessing an open file.  This hook is
511  *	called by various operations that read or write files.  A security
512  *	module can use this hook to perform additional checking on these
513  *	operations, e.g.  to revalidate permissions on use to support privilege
514  *	bracketing or policy changes.  Notice that this hook is used when the
515  *	actual read/write operations are performed, whereas the
516  *	inode_security_ops hook is called when a file is opened (as well as
517  *	many other operations).
518  *	Caveat:  Although this hook can be used to revalidate permissions for
519  *	various system call operations that read or write files, it does not
520  *	address the revalidation of permissions for memory-mapped files.
521  *	Security modules must handle this separately if they need such
522  *	revalidation.
523  *	@file contains the file structure being accessed.
524  *	@mask contains the requested permissions.
525  *	Return 0 if permission is granted.
526  * @file_alloc_security:
527  *	Allocate and attach a security structure to the file->f_security field.
528  *	The security field is initialized to NULL when the structure is first
529  *	created.
530  *	@file contains the file structure to secure.
531  *	Return 0 if the hook is successful and permission is granted.
532  * @file_free_security:
533  *	Deallocate and free any security structures stored in file->f_security.
534  *	@file contains the file structure being modified.
535  * @file_ioctl:
536  *	@file contains the file structure.
537  *	@cmd contains the operation to perform.
538  *	@arg contains the operational arguments.
539  *	Check permission for an ioctl operation on @file.  Note that @arg
540  *	sometimes represents a user space pointer; in other cases, it may be a
541  *	simple integer value.  When @arg represents a user space pointer, it
542  *	should never be used by the security module.
543  *	Return 0 if permission is granted.
544  * @mmap_addr :
545  *	Check permissions for a mmap operation at @addr.
546  *	@addr contains virtual address that will be used for the operation.
547  *	Return 0 if permission is granted.
548  * @mmap_file :
549  *	Check permissions for a mmap operation.  The @file may be NULL, e.g.
550  *	if mapping anonymous memory.
551  *	@file contains the file structure for file to map (may be NULL).
552  *	@reqprot contains the protection requested by the application.
553  *	@prot contains the protection that will be applied by the kernel.
554  *	@flags contains the operational flags.
555  *	Return 0 if permission is granted.
556  * @file_mprotect:
557  *	Check permissions before changing memory access permissions.
558  *	@vma contains the memory region to modify.
559  *	@reqprot contains the protection requested by the application.
560  *	@prot contains the protection that will be applied by the kernel.
561  *	Return 0 if permission is granted.
562  * @file_lock:
563  *	Check permission before performing file locking operations.
564  *	Note the hook mediates both flock and fcntl style locks.
565  *	@file contains the file structure.
566  *	@cmd contains the posix-translated lock operation to perform
567  *	(e.g. F_RDLCK, F_WRLCK).
568  *	Return 0 if permission is granted.
569  * @file_fcntl:
570  *	Check permission before allowing the file operation specified by @cmd
571  *	from being performed on the file @file.  Note that @arg sometimes
572  *	represents a user space pointer; in other cases, it may be a simple
573  *	integer value.  When @arg represents a user space pointer, it should
574  *	never be used by the security module.
575  *	@file contains the file structure.
576  *	@cmd contains the operation to be performed.
577  *	@arg contains the operational arguments.
578  *	Return 0 if permission is granted.
579  * @file_set_fowner:
580  *	Save owner security information (typically from current->security) in
581  *	file->f_security for later use by the send_sigiotask hook.
582  *	@file contains the file structure to update.
583  *	Return 0 on success.
584  * @file_send_sigiotask:
585  *	Check permission for the file owner @fown to send SIGIO or SIGURG to the
586  *	process @tsk.  Note that this hook is sometimes called from interrupt.
587  *	Note that the fown_struct, @fown, is never outside the context of a
588  *	struct file, so the file structure (and associated security information)
589  *	can always be obtained: container_of(fown, struct file, f_owner)
590  *	@tsk contains the structure of task receiving signal.
591  *	@fown contains the file owner information.
592  *	@sig is the signal that will be sent.  When 0, kernel sends SIGIO.
593  *	Return 0 if permission is granted.
594  * @file_receive:
595  *	This hook allows security modules to control the ability of a process
596  *	to receive an open file descriptor via socket IPC.
597  *	@file contains the file structure being received.
598  *	Return 0 if permission is granted.
599  * @file_open:
600  *	Save open-time permission checking state for later use upon
601  *	file_permission, and recheck access if anything has changed
602  *	since inode_permission.
603  *
604  * Security hooks for task operations.
605  *
606  * @task_alloc:
607  *	@task task being allocated.
608  *	@clone_flags contains the flags indicating what should be shared.
609  *	Handle allocation of task-related resources.
610  *	Returns a zero on success, negative values on failure.
611  * @task_free:
612  *	@task task about to be freed.
613  *	Handle release of task-related resources. (Note that this can be called
614  *	from interrupt context.)
615  * @cred_alloc_blank:
616  *	@cred points to the credentials.
617  *	@gfp indicates the atomicity of any memory allocations.
618  *	Only allocate sufficient memory and attach to @cred such that
619  *	cred_transfer() will not get ENOMEM.
620  * @cred_free:
621  *	@cred points to the credentials.
622  *	Deallocate and clear the cred->security field in a set of credentials.
623  * @cred_prepare:
624  *	@new points to the new credentials.
625  *	@old points to the original credentials.
626  *	@gfp indicates the atomicity of any memory allocations.
627  *	Prepare a new set of credentials by copying the data from the old set.
628  * @cred_transfer:
629  *	@new points to the new credentials.
630  *	@old points to the original credentials.
631  *	Transfer data from original creds to new creds
632  * @cred_getsecid:
633  *	Retrieve the security identifier of the cred structure @c
634  *	@c contains the credentials, secid will be placed into @secid.
635  *	In case of failure, @secid will be set to zero.
636  * @kernel_act_as:
637  *	Set the credentials for a kernel service to act as (subjective context).
638  *	@new points to the credentials to be modified.
639  *	@secid specifies the security ID to be set
640  *	The current task must be the one that nominated @secid.
641  *	Return 0 if successful.
642  * @kernel_create_files_as:
643  *	Set the file creation context in a set of credentials to be the same as
644  *	the objective context of the specified inode.
645  *	@new points to the credentials to be modified.
646  *	@inode points to the inode to use as a reference.
647  *	The current task must be the one that nominated @inode.
648  *	Return 0 if successful.
649  * @kernel_module_request:
650  *	Ability to trigger the kernel to automatically upcall to userspace for
651  *	userspace to load a kernel module with the given name.
652  *	@kmod_name name of the module requested by the kernel
653  *	Return 0 if successful.
654  * @kernel_load_data:
655  *	Load data provided by userspace.
656  *	@id kernel load data identifier
657  *	@contents if a subsequent @kernel_post_load_data will be called.
658  *	Return 0 if permission is granted.
659  * @kernel_post_load_data:
660  *	Load data provided by a non-file source (usually userspace buffer).
661  *	@buf pointer to buffer containing the data contents.
662  *	@size length of the data contents.
663  *	@id kernel load data identifier
664  *	@description a text description of what was loaded, @id-specific
665  *	Return 0 if permission is granted.
666  *	This must be paired with a prior @kernel_load_data call that had
667  *	@contents set to true.
668  * @kernel_read_file:
669  *	Read a file specified by userspace.
670  *	@file contains the file structure pointing to the file being read
671  *	by the kernel.
672  *	@id kernel read file identifier
673  *	@contents if a subsequent @kernel_post_read_file will be called.
674  *	Return 0 if permission is granted.
675  * @kernel_post_read_file:
676  *	Read a file specified by userspace.
677  *	@file contains the file structure pointing to the file being read
678  *	by the kernel.
679  *	@buf pointer to buffer containing the file contents.
680  *	@size length of the file contents.
681  *	@id kernel read file identifier
682  *	This must be paired with a prior @kernel_read_file call that had
683  *	@contents set to true.
684  *	Return 0 if permission is granted.
685  * @task_fix_setuid:
686  *	Update the module's state after setting one or more of the user
687  *	identity attributes of the current process.  The @flags parameter
688  *	indicates which of the set*uid system calls invoked this hook.  If
689  *	@new is the set of credentials that will be installed.  Modifications
690  *	should be made to this rather than to @current->cred.
691  *	@old is the set of credentials that are being replaces
692  *	@flags contains one of the LSM_SETID_* values.
693  *	Return 0 on success.
694  * @task_fix_setgid:
695  *	Update the module's state after setting one or more of the group
696  *	identity attributes of the current process.  The @flags parameter
697  *	indicates which of the set*gid system calls invoked this hook.
698  *	@new is the set of credentials that will be installed.  Modifications
699  *	should be made to this rather than to @current->cred.
700  *	@old is the set of credentials that are being replaced.
701  *	@flags contains one of the LSM_SETID_* values.
702  *	Return 0 on success.
703  * @task_setpgid:
704  *	Check permission before setting the process group identifier of the
705  *	process @p to @pgid.
706  *	@p contains the task_struct for process being modified.
707  *	@pgid contains the new pgid.
708  *	Return 0 if permission is granted.
709  * @task_getpgid:
710  *	Check permission before getting the process group identifier of the
711  *	process @p.
712  *	@p contains the task_struct for the process.
713  *	Return 0 if permission is granted.
714  * @task_getsid:
715  *	Check permission before getting the session identifier of the process
716  *	@p.
717  *	@p contains the task_struct for the process.
718  *	Return 0 if permission is granted.
719  * @task_getsecid_subj:
720  *	Retrieve the subjective security identifier of the task_struct in @p
721  *	and return it in @secid.  Special care must be taken to ensure that @p
722  *	is the either the "current" task, or the caller has exclusive access
723  *	to @p.
724  *	In case of failure, @secid will be set to zero.
725  * @task_getsecid_obj:
726  *	Retrieve the objective security identifier of the task_struct in @p
727  *	and return it in @secid.
728  *	In case of failure, @secid will be set to zero.
729  *
730  * @task_setnice:
731  *	Check permission before setting the nice value of @p to @nice.
732  *	@p contains the task_struct of process.
733  *	@nice contains the new nice value.
734  *	Return 0 if permission is granted.
735  * @task_setioprio:
736  *	Check permission before setting the ioprio value of @p to @ioprio.
737  *	@p contains the task_struct of process.
738  *	@ioprio contains the new ioprio value
739  *	Return 0 if permission is granted.
740  * @task_getioprio:
741  *	Check permission before getting the ioprio value of @p.
742  *	@p contains the task_struct of process.
743  *	Return 0 if permission is granted.
744  * @task_prlimit:
745  *	Check permission before getting and/or setting the resource limits of
746  *	another task.
747  *	@cred points to the cred structure for the current task.
748  *	@tcred points to the cred structure for the target task.
749  *	@flags contains the LSM_PRLIMIT_* flag bits indicating whether the
750  *	resource limits are being read, modified, or both.
751  *	Return 0 if permission is granted.
752  * @task_setrlimit:
753  *	Check permission before setting the resource limits of process @p
754  *	for @resource to @new_rlim.  The old resource limit values can
755  *	be examined by dereferencing (p->signal->rlim + resource).
756  *	@p points to the task_struct for the target task's group leader.
757  *	@resource contains the resource whose limit is being set.
758  *	@new_rlim contains the new limits for @resource.
759  *	Return 0 if permission is granted.
760  * @task_setscheduler:
761  *	Check permission before setting scheduling policy and/or parameters of
762  *	process @p.
763  *	@p contains the task_struct for process.
764  *	Return 0 if permission is granted.
765  * @task_getscheduler:
766  *	Check permission before obtaining scheduling information for process
767  *	@p.
768  *	@p contains the task_struct for process.
769  *	Return 0 if permission is granted.
770  * @task_movememory:
771  *	Check permission before moving memory owned by process @p.
772  *	@p contains the task_struct for process.
773  *	Return 0 if permission is granted.
774  * @task_kill:
775  *	Check permission before sending signal @sig to @p.  @info can be NULL,
776  *	the constant 1, or a pointer to a kernel_siginfo structure.  If @info is 1 or
777  *	SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
778  *	from the kernel and should typically be permitted.
779  *	SIGIO signals are handled separately by the send_sigiotask hook in
780  *	file_security_ops.
781  *	@p contains the task_struct for process.
782  *	@info contains the signal information.
783  *	@sig contains the signal value.
784  *	@cred contains the cred of the process where the signal originated, or
785  *	NULL if the current task is the originator.
786  *	Return 0 if permission is granted.
787  * @task_prctl:
788  *	Check permission before performing a process control operation on the
789  *	current process.
790  *	@option contains the operation.
791  *	@arg2 contains a argument.
792  *	@arg3 contains a argument.
793  *	@arg4 contains a argument.
794  *	@arg5 contains a argument.
795  *	Return -ENOSYS if no-one wanted to handle this op, any other value to
796  *	cause prctl() to return immediately with that value.
797  * @task_to_inode:
798  *	Set the security attributes for an inode based on an associated task's
799  *	security attributes, e.g. for /proc/pid inodes.
800  *	@p contains the task_struct for the task.
801  *	@inode contains the inode structure for the inode.
802  *
803  * Security hooks for Netlink messaging.
804  *
805  * @netlink_send:
806  *	Save security information for a netlink message so that permission
807  *	checking can be performed when the message is processed.  The security
808  *	information can be saved using the eff_cap field of the
809  *	netlink_skb_parms structure.  Also may be used to provide fine
810  *	grained control over message transmission.
811  *	@sk associated sock of task sending the message.
812  *	@skb contains the sk_buff structure for the netlink message.
813  *	Return 0 if the information was successfully saved and message
814  *	is allowed to be transmitted.
815  *
816  * Security hooks for Unix domain networking.
817  *
818  * @unix_stream_connect:
819  *	Check permissions before establishing a Unix domain stream connection
820  *	between @sock and @other.
821  *	@sock contains the sock structure.
822  *	@other contains the peer sock structure.
823  *	@newsk contains the new sock structure.
824  *	Return 0 if permission is granted.
825  * @unix_may_send:
826  *	Check permissions before connecting or sending datagrams from @sock to
827  *	@other.
828  *	@sock contains the socket structure.
829  *	@other contains the peer socket structure.
830  *	Return 0 if permission is granted.
831  *
832  * The @unix_stream_connect and @unix_may_send hooks were necessary because
833  * Linux provides an alternative to the conventional file name space for Unix
834  * domain sockets.  Whereas binding and connecting to sockets in the file name
835  * space is mediated by the typical file permissions (and caught by the mknod
836  * and permission hooks in inode_security_ops), binding and connecting to
837  * sockets in the abstract name space is completely unmediated.  Sufficient
838  * control of Unix domain sockets in the abstract name space isn't possible
839  * using only the socket layer hooks, since we need to know the actual target
840  * socket, which is not looked up until we are inside the af_unix code.
841  *
842  * Security hooks for socket operations.
843  *
844  * @socket_create:
845  *	Check permissions prior to creating a new socket.
846  *	@family contains the requested protocol family.
847  *	@type contains the requested communications type.
848  *	@protocol contains the requested protocol.
849  *	@kern set to 1 if a kernel socket.
850  *	Return 0 if permission is granted.
851  * @socket_post_create:
852  *	This hook allows a module to update or allocate a per-socket security
853  *	structure. Note that the security field was not added directly to the
854  *	socket structure, but rather, the socket security information is stored
855  *	in the associated inode.  Typically, the inode alloc_security hook will
856  *	allocate and attach security information to
857  *	SOCK_INODE(sock)->i_security.  This hook may be used to update the
858  *	SOCK_INODE(sock)->i_security field with additional information that
859  *	wasn't available when the inode was allocated.
860  *	@sock contains the newly created socket structure.
861  *	@family contains the requested protocol family.
862  *	@type contains the requested communications type.
863  *	@protocol contains the requested protocol.
864  *	@kern set to 1 if a kernel socket.
865  * @socket_socketpair:
866  *	Check permissions before creating a fresh pair of sockets.
867  *	@socka contains the first socket structure.
868  *	@sockb contains the second socket structure.
869  *	Return 0 if permission is granted and the connection was established.
870  * @socket_bind:
871  *	Check permission before socket protocol layer bind operation is
872  *	performed and the socket @sock is bound to the address specified in the
873  *	@address parameter.
874  *	@sock contains the socket structure.
875  *	@address contains the address to bind to.
876  *	@addrlen contains the length of address.
877  *	Return 0 if permission is granted.
878  * @socket_connect:
879  *	Check permission before socket protocol layer connect operation
880  *	attempts to connect socket @sock to a remote address, @address.
881  *	@sock contains the socket structure.
882  *	@address contains the address of remote endpoint.
883  *	@addrlen contains the length of address.
884  *	Return 0 if permission is granted.
885  * @socket_listen:
886  *	Check permission before socket protocol layer listen operation.
887  *	@sock contains the socket structure.
888  *	@backlog contains the maximum length for the pending connection queue.
889  *	Return 0 if permission is granted.
890  * @socket_accept:
891  *	Check permission before accepting a new connection.  Note that the new
892  *	socket, @newsock, has been created and some information copied to it,
893  *	but the accept operation has not actually been performed.
894  *	@sock contains the listening socket structure.
895  *	@newsock contains the newly created server socket for connection.
896  *	Return 0 if permission is granted.
897  * @socket_sendmsg:
898  *	Check permission before transmitting a message to another socket.
899  *	@sock contains the socket structure.
900  *	@msg contains the message to be transmitted.
901  *	@size contains the size of message.
902  *	Return 0 if permission is granted.
903  * @socket_recvmsg:
904  *	Check permission before receiving a message from a socket.
905  *	@sock contains the socket structure.
906  *	@msg contains the message structure.
907  *	@size contains the size of message structure.
908  *	@flags contains the operational flags.
909  *	Return 0 if permission is granted.
910  * @socket_getsockname:
911  *	Check permission before the local address (name) of the socket object
912  *	@sock is retrieved.
913  *	@sock contains the socket structure.
914  *	Return 0 if permission is granted.
915  * @socket_getpeername:
916  *	Check permission before the remote address (name) of a socket object
917  *	@sock is retrieved.
918  *	@sock contains the socket structure.
919  *	Return 0 if permission is granted.
920  * @socket_getsockopt:
921  *	Check permissions before retrieving the options associated with socket
922  *	@sock.
923  *	@sock contains the socket structure.
924  *	@level contains the protocol level to retrieve option from.
925  *	@optname contains the name of option to retrieve.
926  *	Return 0 if permission is granted.
927  * @socket_setsockopt:
928  *	Check permissions before setting the options associated with socket
929  *	@sock.
930  *	@sock contains the socket structure.
931  *	@level contains the protocol level to set options for.
932  *	@optname contains the name of the option to set.
933  *	Return 0 if permission is granted.
934  * @socket_shutdown:
935  *	Checks permission before all or part of a connection on the socket
936  *	@sock is shut down.
937  *	@sock contains the socket structure.
938  *	@how contains the flag indicating how future sends and receives
939  *	are handled.
940  *	Return 0 if permission is granted.
941  * @socket_sock_rcv_skb:
942  *	Check permissions on incoming network packets.  This hook is distinct
943  *	from Netfilter's IP input hooks since it is the first time that the
944  *	incoming sk_buff @skb has been associated with a particular socket, @sk.
945  *	Must not sleep inside this hook because some callers hold spinlocks.
946  *	@sk contains the sock (not socket) associated with the incoming sk_buff.
947  *	@skb contains the incoming network data.
948  * @socket_getpeersec_stream:
949  *	This hook allows the security module to provide peer socket security
950  *	state for unix or connected tcp sockets to userspace via getsockopt
951  *	SO_GETPEERSEC.  For tcp sockets this can be meaningful if the
952  *	socket is associated with an ipsec SA.
953  *	@sock is the local socket.
954  *	@optval userspace memory where the security state is to be copied.
955  *	@optlen userspace int where the module should copy the actual length
956  *	of the security state.
957  *	@len as input is the maximum length to copy to userspace provided
958  *	by the caller.
959  *	Return 0 if all is well, otherwise, typical getsockopt return
960  *	values.
961  * @socket_getpeersec_dgram:
962  *	This hook allows the security module to provide peer socket security
963  *	state for udp sockets on a per-packet basis to userspace via
964  *	getsockopt SO_GETPEERSEC. The application must first have indicated
965  *	the IP_PASSSEC option via getsockopt. It can then retrieve the
966  *	security state returned by this hook for a packet via the SCM_SECURITY
967  *	ancillary message type.
968  *	@sock contains the peer socket. May be NULL.
969  *	@skb is the sk_buff for the packet being queried. May be NULL.
970  *	@secid pointer to store the secid of the packet.
971  *	Return 0 on success, error on failure.
972  * @sk_alloc_security:
973  *	Allocate and attach a security structure to the sk->sk_security field,
974  *	which is used to copy security attributes between local stream sockets.
975  * @sk_free_security:
976  *	Deallocate security structure.
977  * @sk_clone_security:
978  *	Clone/copy security structure.
979  * @sk_getsecid:
980  *	Retrieve the LSM-specific secid for the sock to enable caching
981  *	of network authorizations.
982  * @sock_graft:
983  *	Sets the socket's isec sid to the sock's sid.
984  * @inet_conn_request:
985  *	Sets the openreq's sid to socket's sid with MLS portion taken
986  *	from peer sid.
987  * @inet_csk_clone:
988  *	Sets the new child socket's sid to the openreq sid.
989  * @inet_conn_established:
990  *	Sets the connection's peersid to the secmark on skb.
991  * @secmark_relabel_packet:
992  *	check if the process should be allowed to relabel packets to
993  *	the given secid
994  * @secmark_refcount_inc:
995  *	tells the LSM to increment the number of secmark labeling rules loaded
996  * @secmark_refcount_dec:
997  *	tells the LSM to decrement the number of secmark labeling rules loaded
998  * @req_classify_flow:
999  *	Sets the flow's sid to the openreq sid.
1000  * @tun_dev_alloc_security:
1001  *	This hook allows a module to allocate a security structure for a TUN
1002  *	device.
1003  *	@security pointer to a security structure pointer.
1004  *	Returns a zero on success, negative values on failure.
1005  * @tun_dev_free_security:
1006  *	This hook allows a module to free the security structure for a TUN
1007  *	device.
1008  *	@security pointer to the TUN device's security structure
1009  * @tun_dev_create:
1010  *	Check permissions prior to creating a new TUN device.
1011  * @tun_dev_attach_queue:
1012  *	Check permissions prior to attaching to a TUN device queue.
1013  *	@security pointer to the TUN device's security structure.
1014  * @tun_dev_attach:
1015  *	This hook can be used by the module to update any security state
1016  *	associated with the TUN device's sock structure.
1017  *	@sk contains the existing sock structure.
1018  *	@security pointer to the TUN device's security structure.
1019  * @tun_dev_open:
1020  *	This hook can be used by the module to update any security state
1021  *	associated with the TUN device's security structure.
1022  *	@security pointer to the TUN devices's security structure.
1023  *
1024  * Security hooks for SCTP
1025  *
1026  * @sctp_assoc_request:
1027  *	Passes the @ep and @chunk->skb of the association INIT packet to
1028  *	the security module.
1029  *	@ep pointer to sctp endpoint structure.
1030  *	@skb pointer to skbuff of association packet.
1031  *	Return 0 on success, error on failure.
1032  * @sctp_bind_connect:
1033  *	Validiate permissions required for each address associated with sock
1034  *	@sk. Depending on @optname, the addresses will be treated as either
1035  *	for a connect or bind service. The @addrlen is calculated on each
1036  *	ipv4 and ipv6 address using sizeof(struct sockaddr_in) or
1037  *	sizeof(struct sockaddr_in6).
1038  *	@sk pointer to sock structure.
1039  *	@optname name of the option to validate.
1040  *	@address list containing one or more ipv4/ipv6 addresses.
1041  *	@addrlen total length of address(s).
1042  *	Return 0 on success, error on failure.
1043  * @sctp_sk_clone:
1044  *	Called whenever a new socket is created by accept(2) (i.e. a TCP
1045  *	style socket) or when a socket is 'peeled off' e.g userspace
1046  *	calls sctp_peeloff(3).
1047  *	@ep pointer to current sctp endpoint structure.
1048  *	@sk pointer to current sock structure.
1049  *	@sk pointer to new sock structure.
1050  *
1051  * Security hooks for Infiniband
1052  *
1053  * @ib_pkey_access:
1054  *	Check permission to access a pkey when modifing a QP.
1055  *	@subnet_prefix the subnet prefix of the port being used.
1056  *	@pkey the pkey to be accessed.
1057  *	@sec pointer to a security structure.
1058  * @ib_endport_manage_subnet:
1059  *	Check permissions to send and receive SMPs on a end port.
1060  *	@dev_name the IB device name (i.e. mlx4_0).
1061  *	@port_num the port number.
1062  *	@sec pointer to a security structure.
1063  * @ib_alloc_security:
1064  *	Allocate a security structure for Infiniband objects.
1065  *	@sec pointer to a security structure pointer.
1066  *	Returns 0 on success, non-zero on failure
1067  * @ib_free_security:
1068  *	Deallocate an Infiniband security structure.
1069  *	@sec contains the security structure to be freed.
1070  *
1071  * Security hooks for XFRM operations.
1072  *
1073  * @xfrm_policy_alloc_security:
1074  *	@ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1075  *	Database used by the XFRM system.
1076  *	@sec_ctx contains the security context information being provided by
1077  *	the user-level policy update program (e.g., setkey).
1078  *	Allocate a security structure to the xp->security field; the security
1079  *	field is initialized to NULL when the xfrm_policy is allocated.
1080  *	Return 0 if operation was successful (memory to allocate, legal context)
1081  *	@gfp is to specify the context for the allocation
1082  * @xfrm_policy_clone_security:
1083  *	@old_ctx contains an existing xfrm_sec_ctx.
1084  *	@new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1085  *	Allocate a security structure in new_ctxp that contains the
1086  *	information from the old_ctx structure.
1087  *	Return 0 if operation was successful (memory to allocate).
1088  * @xfrm_policy_free_security:
1089  *	@ctx contains the xfrm_sec_ctx
1090  *	Deallocate xp->security.
1091  * @xfrm_policy_delete_security:
1092  *	@ctx contains the xfrm_sec_ctx.
1093  *	Authorize deletion of xp->security.
1094  * @xfrm_state_alloc:
1095  *	@x contains the xfrm_state being added to the Security Association
1096  *	Database by the XFRM system.
1097  *	@sec_ctx contains the security context information being provided by
1098  *	the user-level SA generation program (e.g., setkey or racoon).
1099  *	Allocate a security structure to the x->security field; the security
1100  *	field is initialized to NULL when the xfrm_state is allocated. Set the
1101  *	context to correspond to sec_ctx. Return 0 if operation was successful
1102  *	(memory to allocate, legal context).
1103  * @xfrm_state_alloc_acquire:
1104  *	@x contains the xfrm_state being added to the Security Association
1105  *	Database by the XFRM system.
1106  *	@polsec contains the policy's security context.
1107  *	@secid contains the secid from which to take the mls portion of the
1108  *	context.
1109  *	Allocate a security structure to the x->security field; the security
1110  *	field is initialized to NULL when the xfrm_state is allocated. Set the
1111  *	context to correspond to secid. Return 0 if operation was successful
1112  *	(memory to allocate, legal context).
1113  * @xfrm_state_free_security:
1114  *	@x contains the xfrm_state.
1115  *	Deallocate x->security.
1116  * @xfrm_state_delete_security:
1117  *	@x contains the xfrm_state.
1118  *	Authorize deletion of x->security.
1119  * @xfrm_policy_lookup:
1120  *	@ctx contains the xfrm_sec_ctx for which the access control is being
1121  *	checked.
1122  *	@fl_secid contains the flow security label that is used to authorize
1123  *	access to the policy xp.
1124  *	@dir contains the direction of the flow (input or output).
1125  *	Check permission when a flow selects a xfrm_policy for processing
1126  *	XFRMs on a packet.  The hook is called when selecting either a
1127  *	per-socket policy or a generic xfrm policy.
1128  *	Return 0 if permission is granted, -ESRCH otherwise, or -errno
1129  *	on other errors.
1130  * @xfrm_state_pol_flow_match:
1131  *	@x contains the state to match.
1132  *	@xp contains the policy to check for a match.
1133  *	@flic contains the flowi_common struct to check for a match.
1134  *	Return 1 if there is a match.
1135  * @xfrm_decode_session:
1136  *	@skb points to skb to decode.
1137  *	@secid points to the flow key secid to set.
1138  *	@ckall says if all xfrms used should be checked for same secid.
1139  *	Return 0 if ckall is zero or all xfrms used have the same secid.
1140  *
1141  * Security hooks affecting all Key Management operations
1142  *
1143  * @key_alloc:
1144  *	Permit allocation of a key and assign security data. Note that key does
1145  *	not have a serial number assigned at this point.
1146  *	@key points to the key.
1147  *	@flags is the allocation flags
1148  *	Return 0 if permission is granted, -ve error otherwise.
1149  * @key_free:
1150  *	Notification of destruction; free security data.
1151  *	@key points to the key.
1152  *	No return value.
1153  * @key_permission:
1154  *	See whether a specific operational right is granted to a process on a
1155  *	key.
1156  *	@key_ref refers to the key (key pointer + possession attribute bit).
1157  *	@cred points to the credentials to provide the context against which to
1158  *	evaluate the security data on the key.
1159  *	@perm describes the combination of permissions required of this key.
1160  *	Return 0 if permission is granted, -ve error otherwise.
1161  * @key_getsecurity:
1162  *	Get a textual representation of the security context attached to a key
1163  *	for the purposes of honouring KEYCTL_GETSECURITY.  This function
1164  *	allocates the storage for the NUL-terminated string and the caller
1165  *	should free it.
1166  *	@key points to the key to be queried.
1167  *	@_buffer points to a pointer that should be set to point to the
1168  *	resulting string (if no label or an error occurs).
1169  *	Return the length of the string (including terminating NUL) or -ve if
1170  *	an error.
1171  *	May also return 0 (and a NULL buffer pointer) if there is no label.
1172  *
1173  * Security hooks affecting all System V IPC operations.
1174  *
1175  * @ipc_permission:
1176  *	Check permissions for access to IPC
1177  *	@ipcp contains the kernel IPC permission structure
1178  *	@flag contains the desired (requested) permission set
1179  *	Return 0 if permission is granted.
1180  * @ipc_getsecid:
1181  *	Get the secid associated with the ipc object.
1182  *	@ipcp contains the kernel IPC permission structure.
1183  *	@secid contains a pointer to the location where result will be saved.
1184  *	In case of failure, @secid will be set to zero.
1185  *
1186  * Security hooks for individual messages held in System V IPC message queues
1187  *
1188  * @msg_msg_alloc_security:
1189  *	Allocate and attach a security structure to the msg->security field.
1190  *	The security field is initialized to NULL when the structure is first
1191  *	created.
1192  *	@msg contains the message structure to be modified.
1193  *	Return 0 if operation was successful and permission is granted.
1194  * @msg_msg_free_security:
1195  *	Deallocate the security structure for this message.
1196  *	@msg contains the message structure to be modified.
1197  *
1198  * Security hooks for System V IPC Message Queues
1199  *
1200  * @msg_queue_alloc_security:
1201  *	Allocate and attach a security structure to the
1202  *	@perm->security field. The security field is initialized to
1203  *	NULL when the structure is first created.
1204  *	@perm contains the IPC permissions of the message queue.
1205  *	Return 0 if operation was successful and permission is granted.
1206  * @msg_queue_free_security:
1207  *	Deallocate security field @perm->security for the message queue.
1208  *	@perm contains the IPC permissions of the message queue.
1209  * @msg_queue_associate:
1210  *	Check permission when a message queue is requested through the
1211  *	msgget system call. This hook is only called when returning the
1212  *	message queue identifier for an existing message queue, not when a
1213  *	new message queue is created.
1214  *	@perm contains the IPC permissions of the message queue.
1215  *	@msqflg contains the operation control flags.
1216  *	Return 0 if permission is granted.
1217  * @msg_queue_msgctl:
1218  *	Check permission when a message control operation specified by @cmd
1219  *	is to be performed on the message queue with permissions @perm.
1220  *	The @perm may be NULL, e.g. for IPC_INFO or MSG_INFO.
1221  *	@perm contains the IPC permissions of the msg queue. May be NULL.
1222  *	@cmd contains the operation to be performed.
1223  *	Return 0 if permission is granted.
1224  * @msg_queue_msgsnd:
1225  *	Check permission before a message, @msg, is enqueued on the message
1226  *	queue with permissions @perm.
1227  *	@perm contains the IPC permissions of the message queue.
1228  *	@msg contains the message to be enqueued.
1229  *	@msqflg contains operational flags.
1230  *	Return 0 if permission is granted.
1231  * @msg_queue_msgrcv:
1232  *	Check permission before a message, @msg, is removed from the message
1233  *	queue. The @target task structure contains a pointer to the
1234  *	process that will be receiving the message (not equal to the current
1235  *	process when inline receives are being performed).
1236  *	@perm contains the IPC permissions of the message queue.
1237  *	@msg contains the message destination.
1238  *	@target contains the task structure for recipient process.
1239  *	@type contains the type of message requested.
1240  *	@mode contains the operational flags.
1241  *	Return 0 if permission is granted.
1242  *
1243  * Security hooks for System V Shared Memory Segments
1244  *
1245  * @shm_alloc_security:
1246  *	Allocate and attach a security structure to the @perm->security
1247  *	field. The security field is initialized to NULL when the structure is
1248  *	first created.
1249  *	@perm contains the IPC permissions of the shared memory structure.
1250  *	Return 0 if operation was successful and permission is granted.
1251  * @shm_free_security:
1252  *	Deallocate the security structure @perm->security for the memory segment.
1253  *	@perm contains the IPC permissions of the shared memory structure.
1254  * @shm_associate:
1255  *	Check permission when a shared memory region is requested through the
1256  *	shmget system call. This hook is only called when returning the shared
1257  *	memory region identifier for an existing region, not when a new shared
1258  *	memory region is created.
1259  *	@perm contains the IPC permissions of the shared memory structure.
1260  *	@shmflg contains the operation control flags.
1261  *	Return 0 if permission is granted.
1262  * @shm_shmctl:
1263  *	Check permission when a shared memory control operation specified by
1264  *	@cmd is to be performed on the shared memory region with permissions @perm.
1265  *	The @perm may be NULL, e.g. for IPC_INFO or SHM_INFO.
1266  *	@perm contains the IPC permissions of the shared memory structure.
1267  *	@cmd contains the operation to be performed.
1268  *	Return 0 if permission is granted.
1269  * @shm_shmat:
1270  *	Check permissions prior to allowing the shmat system call to attach the
1271  *	shared memory segment with permissions @perm to the data segment of the
1272  *	calling process. The attaching address is specified by @shmaddr.
1273  *	@perm contains the IPC permissions of the shared memory structure.
1274  *	@shmaddr contains the address to attach memory region to.
1275  *	@shmflg contains the operational flags.
1276  *	Return 0 if permission is granted.
1277  *
1278  * Security hooks for System V Semaphores
1279  *
1280  * @sem_alloc_security:
1281  *	Allocate and attach a security structure to the @perm->security
1282  *	field. The security field is initialized to NULL when the structure is
1283  *	first created.
1284  *	@perm contains the IPC permissions of the semaphore.
1285  *	Return 0 if operation was successful and permission is granted.
1286  * @sem_free_security:
1287  *	Deallocate security structure @perm->security for the semaphore.
1288  *	@perm contains the IPC permissions of the semaphore.
1289  * @sem_associate:
1290  *	Check permission when a semaphore is requested through the semget
1291  *	system call. This hook is only called when returning the semaphore
1292  *	identifier for an existing semaphore, not when a new one must be
1293  *	created.
1294  *	@perm contains the IPC permissions of the semaphore.
1295  *	@semflg contains the operation control flags.
1296  *	Return 0 if permission is granted.
1297  * @sem_semctl:
1298  *	Check permission when a semaphore operation specified by @cmd is to be
1299  *	performed on the semaphore. The @perm may be NULL, e.g. for
1300  *	IPC_INFO or SEM_INFO.
1301  *	@perm contains the IPC permissions of the semaphore. May be NULL.
1302  *	@cmd contains the operation to be performed.
1303  *	Return 0 if permission is granted.
1304  * @sem_semop:
1305  *	Check permissions before performing operations on members of the
1306  *	semaphore set. If the @alter flag is nonzero, the semaphore set
1307  *	may be modified.
1308  *	@perm contains the IPC permissions of the semaphore.
1309  *	@sops contains the operations to perform.
1310  *	@nsops contains the number of operations to perform.
1311  *	@alter contains the flag indicating whether changes are to be made.
1312  *	Return 0 if permission is granted.
1313  *
1314  * @binder_set_context_mgr:
1315  *	Check whether @mgr is allowed to be the binder context manager.
1316  *	@mgr contains the task_struct for the task being registered.
1317  *	Return 0 if permission is granted.
1318  * @binder_transaction:
1319  *	Check whether @from is allowed to invoke a binder transaction call
1320  *	to @to.
1321  *	@from contains the task_struct for the sending task.
1322  *	@to contains the task_struct for the receiving task.
1323  * @binder_transfer_binder:
1324  *	Check whether @from is allowed to transfer a binder reference to @to.
1325  *	@from contains the task_struct for the sending task.
1326  *	@to contains the task_struct for the receiving task.
1327  * @binder_transfer_file:
1328  *	Check whether @from is allowed to transfer @file to @to.
1329  *	@from contains the task_struct for the sending task.
1330  *	@file contains the struct file being transferred.
1331  *	@to contains the task_struct for the receiving task.
1332  *
1333  * @ptrace_access_check:
1334  *	Check permission before allowing the current process to trace the
1335  *	@child process.
1336  *	Security modules may also want to perform a process tracing check
1337  *	during an execve in the set_security or apply_creds hooks of
1338  *	tracing check during an execve in the bprm_set_creds hook of
1339  *	binprm_security_ops if the process is being traced and its security
1340  *	attributes would be changed by the execve.
1341  *	@child contains the task_struct structure for the target process.
1342  *	@mode contains the PTRACE_MODE flags indicating the form of access.
1343  *	Return 0 if permission is granted.
1344  * @ptrace_traceme:
1345  *	Check that the @parent process has sufficient permission to trace the
1346  *	current process before allowing the current process to present itself
1347  *	to the @parent process for tracing.
1348  *	@parent contains the task_struct structure for debugger process.
1349  *	Return 0 if permission is granted.
1350  * @capget:
1351  *	Get the @effective, @inheritable, and @permitted capability sets for
1352  *	the @target process.  The hook may also perform permission checking to
1353  *	determine if the current process is allowed to see the capability sets
1354  *	of the @target process.
1355  *	@target contains the task_struct structure for target process.
1356  *	@effective contains the effective capability set.
1357  *	@inheritable contains the inheritable capability set.
1358  *	@permitted contains the permitted capability set.
1359  *	Return 0 if the capability sets were successfully obtained.
1360  * @capset:
1361  *	Set the @effective, @inheritable, and @permitted capability sets for
1362  *	the current process.
1363  *	@new contains the new credentials structure for target process.
1364  *	@old contains the current credentials structure for target process.
1365  *	@effective contains the effective capability set.
1366  *	@inheritable contains the inheritable capability set.
1367  *	@permitted contains the permitted capability set.
1368  *	Return 0 and update @new if permission is granted.
1369  * @capable:
1370  *	Check whether the @tsk process has the @cap capability in the indicated
1371  *	credentials.
1372  *	@cred contains the credentials to use.
1373  *	@ns contains the user namespace we want the capability in
1374  *	@cap contains the capability <include/linux/capability.h>.
1375  *	@opts contains options for the capable check <include/linux/security.h>
1376  *	Return 0 if the capability is granted for @tsk.
1377  * @quotactl:
1378  * 	Check whether the quotactl syscall is allowed for this @sb.
1379  * @quota_on:
1380  * 	Check whether QUOTAON is allowed for this @dentry.
1381  * @syslog:
1382  *	Check permission before accessing the kernel message ring or changing
1383  *	logging to the console.
1384  *	See the syslog(2) manual page for an explanation of the @type values.
1385  *	@type contains the SYSLOG_ACTION_* constant from <include/linux/syslog.h>
1386  *	Return 0 if permission is granted.
1387  * @settime:
1388  *	Check permission to change the system time.
1389  *	struct timespec64 is defined in <include/linux/time64.h> and timezone
1390  *	is defined in <include/linux/time.h>
1391  *	@ts contains new time
1392  *	@tz contains new timezone
1393  *	Return 0 if permission is granted.
1394  * @vm_enough_memory:
1395  *	Check permissions for allocating a new virtual mapping.
1396  *	@mm contains the mm struct it is being added to.
1397  *	@pages contains the number of pages.
1398  *	Return 0 if permission is granted.
1399  *
1400  * @ismaclabel:
1401  *	Check if the extended attribute specified by @name
1402  *	represents a MAC label. Returns 1 if name is a MAC
1403  *	attribute otherwise returns 0.
1404  *	@name full extended attribute name to check against
1405  *	LSM as a MAC label.
1406  *
1407  * @secid_to_secctx:
1408  *	Convert secid to security context.  If secdata is NULL the length of
1409  *	the result will be returned in seclen, but no secdata will be returned.
1410  *	This does mean that the length could change between calls to check the
1411  *	length and the next call which actually allocates and returns the
1412  *	secdata.
1413  *	@secid contains the security ID.
1414  *	@secdata contains the pointer that stores the converted security
1415  *	context.
1416  *	@seclen pointer which contains the length of the data
1417  * @secctx_to_secid:
1418  *	Convert security context to secid.
1419  *	@secid contains the pointer to the generated security ID.
1420  *	@secdata contains the security context.
1421  *
1422  * @release_secctx:
1423  *	Release the security context.
1424  *	@secdata contains the security context.
1425  *	@seclen contains the length of the security context.
1426  *
1427  * Security hooks for Audit
1428  *
1429  * @audit_rule_init:
1430  *	Allocate and initialize an LSM audit rule structure.
1431  *	@field contains the required Audit action.
1432  *	Fields flags are defined in <include/linux/audit.h>
1433  *	@op contains the operator the rule uses.
1434  *	@rulestr contains the context where the rule will be applied to.
1435  *	@lsmrule contains a pointer to receive the result.
1436  *	Return 0 if @lsmrule has been successfully set,
1437  *	-EINVAL in case of an invalid rule.
1438  *
1439  * @audit_rule_known:
1440  *	Specifies whether given @krule contains any fields related to
1441  *	current LSM.
1442  *	@krule contains the audit rule of interest.
1443  *	Return 1 in case of relation found, 0 otherwise.
1444  *
1445  * @audit_rule_match:
1446  *	Determine if given @secid matches a rule previously approved
1447  *	by @audit_rule_known.
1448  *	@secid contains the security id in question.
1449  *	@field contains the field which relates to current LSM.
1450  *	@op contains the operator that will be used for matching.
1451  *	@lrule points to the audit rule that will be checked against.
1452  *	Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1453  *
1454  * @audit_rule_free:
1455  *	Deallocate the LSM audit rule structure previously allocated by
1456  *	audit_rule_init.
1457  *	@lsmrule contains the allocated rule
1458  *
1459  * @inode_invalidate_secctx:
1460  *	Notify the security module that it must revalidate the security context
1461  *	of an inode.
1462  *
1463  * @inode_notifysecctx:
1464  *	Notify the security module of what the security context of an inode
1465  *	should be.  Initializes the incore security context managed by the
1466  *	security module for this inode.  Example usage:  NFS client invokes
1467  *	this hook to initialize the security context in its incore inode to the
1468  *	value provided by the server for the file when the server returned the
1469  *	file's attributes to the client.
1470  *	Must be called with inode->i_mutex locked.
1471  *	@inode we wish to set the security context of.
1472  *	@ctx contains the string which we wish to set in the inode.
1473  *	@ctxlen contains the length of @ctx.
1474  *
1475  * @inode_setsecctx:
1476  *	Change the security context of an inode.  Updates the
1477  *	incore security context managed by the security module and invokes the
1478  *	fs code as needed (via __vfs_setxattr_noperm) to update any backing
1479  *	xattrs that represent the context.  Example usage:  NFS server invokes
1480  *	this hook to change the security context in its incore inode and on the
1481  *	backing filesystem to a value provided by the client on a SETATTR
1482  *	operation.
1483  *	Must be called with inode->i_mutex locked.
1484  *	@dentry contains the inode we wish to set the security context of.
1485  *	@ctx contains the string which we wish to set in the inode.
1486  *	@ctxlen contains the length of @ctx.
1487  *
1488  * @inode_getsecctx:
1489  *	On success, returns 0 and fills out @ctx and @ctxlen with the security
1490  *	context for the given @inode.
1491  *	@inode we wish to get the security context of.
1492  *	@ctx is a pointer in which to place the allocated security context.
1493  *	@ctxlen points to the place to put the length of @ctx.
1494  *
1495  * Security hooks for the general notification queue:
1496  *
1497  * @post_notification:
1498  *	Check to see if a watch notification can be posted to a particular
1499  *	queue.
1500  *	@w_cred: The credentials of the whoever set the watch.
1501  *	@cred: The event-triggerer's credentials
1502  *	@n: The notification being posted
1503  *
1504  * @watch_key:
1505  *	Check to see if a process is allowed to watch for event notifications
1506  *	from a key or keyring.
1507  *	@key: The key to watch.
1508  *
1509  * Security hooks for using the eBPF maps and programs functionalities through
1510  * eBPF syscalls.
1511  *
1512  * @bpf:
1513  *	Do a initial check for all bpf syscalls after the attribute is copied
1514  *	into the kernel. The actual security module can implement their own
1515  *	rules to check the specific cmd they need.
1516  *
1517  * @bpf_map:
1518  *	Do a check when the kernel generate and return a file descriptor for
1519  *	eBPF maps.
1520  *
1521  *	@map: bpf map that we want to access
1522  *	@mask: the access flags
1523  *
1524  * @bpf_prog:
1525  *	Do a check when the kernel generate and return a file descriptor for
1526  *	eBPF programs.
1527  *
1528  *	@prog: bpf prog that userspace want to use.
1529  *
1530  * @bpf_map_alloc_security:
1531  *	Initialize the security field inside bpf map.
1532  *
1533  * @bpf_map_free_security:
1534  *	Clean up the security information stored inside bpf map.
1535  *
1536  * @bpf_prog_alloc_security:
1537  *	Initialize the security field inside bpf program.
1538  *
1539  * @bpf_prog_free_security:
1540  *	Clean up the security information stored inside bpf prog.
1541  *
1542  * @locked_down:
1543  *     Determine whether a kernel feature that potentially enables arbitrary
1544  *     code execution in kernel space should be permitted.
1545  *
1546  *     @what: kernel feature being accessed
1547  *
1548  * Security hooks for perf events
1549  *
1550  * @perf_event_open:
1551  * 	Check whether the @type of perf_event_open syscall is allowed.
1552  * @perf_event_alloc:
1553  * 	Allocate and save perf_event security info.
1554  * @perf_event_free:
1555  * 	Release (free) perf_event security info.
1556  * @perf_event_read:
1557  * 	Read perf_event security info if allowed.
1558  * @perf_event_write:
1559  * 	Write perf_event security info if allowed.
1560  */
1561 union security_list_options {
1562 	#define LSM_HOOK(RET, DEFAULT, NAME, ...) RET (*NAME)(__VA_ARGS__);
1563 	#include "lsm_hook_defs.h"
1564 	#undef LSM_HOOK
1565 };
1566 
1567 struct security_hook_heads {
1568 	#define LSM_HOOK(RET, DEFAULT, NAME, ...) struct hlist_head NAME;
1569 	#include "lsm_hook_defs.h"
1570 	#undef LSM_HOOK
1571 } __randomize_layout;
1572 
1573 /*
1574  * Security module hook list structure.
1575  * For use with generic list macros for common operations.
1576  */
1577 struct security_hook_list {
1578 	struct hlist_node		list;
1579 	struct hlist_head		*head;
1580 	union security_list_options	hook;
1581 	char				*lsm;
1582 } __randomize_layout;
1583 
1584 /*
1585  * Security blob size or offset data.
1586  */
1587 struct lsm_blob_sizes {
1588 	int	lbs_cred;
1589 	int	lbs_file;
1590 	int	lbs_inode;
1591 	int	lbs_superblock;
1592 	int	lbs_ipc;
1593 	int	lbs_msg_msg;
1594 	int	lbs_task;
1595 };
1596 
1597 /*
1598  * LSM_RET_VOID is used as the default value in LSM_HOOK definitions for void
1599  * LSM hooks (in include/linux/lsm_hook_defs.h).
1600  */
1601 #define LSM_RET_VOID ((void) 0)
1602 
1603 /*
1604  * Initializing a security_hook_list structure takes
1605  * up a lot of space in a source file. This macro takes
1606  * care of the common case and reduces the amount of
1607  * text involved.
1608  */
1609 #define LSM_HOOK_INIT(HEAD, HOOK) \
1610 	{ .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
1611 
1612 extern struct security_hook_heads security_hook_heads;
1613 extern char *lsm_names;
1614 
1615 extern void security_add_hooks(struct security_hook_list *hooks, int count,
1616 				char *lsm);
1617 
1618 #define LSM_FLAG_LEGACY_MAJOR	BIT(0)
1619 #define LSM_FLAG_EXCLUSIVE	BIT(1)
1620 
1621 enum lsm_order {
1622 	LSM_ORDER_FIRST = -1,	/* This is only for capabilities. */
1623 	LSM_ORDER_MUTABLE = 0,
1624 };
1625 
1626 struct lsm_info {
1627 	const char *name;	/* Required. */
1628 	enum lsm_order order;	/* Optional: default is LSM_ORDER_MUTABLE */
1629 	unsigned long flags;	/* Optional: flags describing LSM */
1630 	int *enabled;		/* Optional: controlled by CONFIG_LSM */
1631 	int (*init)(void);	/* Required. */
1632 	struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */
1633 };
1634 
1635 extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
1636 extern struct lsm_info __start_early_lsm_info[], __end_early_lsm_info[];
1637 
1638 #define DEFINE_LSM(lsm)							\
1639 	static struct lsm_info __lsm_##lsm				\
1640 		__used __section(".lsm_info.init")			\
1641 		__aligned(sizeof(unsigned long))
1642 
1643 #define DEFINE_EARLY_LSM(lsm)						\
1644 	static struct lsm_info __early_lsm_##lsm			\
1645 		__used __section(".early_lsm_info.init")		\
1646 		__aligned(sizeof(unsigned long))
1647 
1648 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1649 /*
1650  * Assuring the safety of deleting a security module is up to
1651  * the security module involved. This may entail ordering the
1652  * module's hook list in a particular way, refusing to disable
1653  * the module once a policy is loaded or any number of other
1654  * actions better imagined than described.
1655  *
1656  * The name of the configuration option reflects the only module
1657  * that currently uses the mechanism. Any developer who thinks
1658  * disabling their module is a good idea needs to be at least as
1659  * careful as the SELinux team.
1660  */
security_delete_hooks(struct security_hook_list * hooks,int count)1661 static inline void security_delete_hooks(struct security_hook_list *hooks,
1662 						int count)
1663 {
1664 	int i;
1665 
1666 	for (i = 0; i < count; i++)
1667 		hlist_del_rcu(&hooks[i].list);
1668 }
1669 #endif /* CONFIG_SECURITY_SELINUX_DISABLE */
1670 
1671 /* Currently required to handle SELinux runtime hook disable. */
1672 #ifdef CONFIG_SECURITY_WRITABLE_HOOKS
1673 #define __lsm_ro_after_init
1674 #else
1675 #define __lsm_ro_after_init	__ro_after_init
1676 #endif /* CONFIG_SECURITY_WRITABLE_HOOKS */
1677 
1678 extern int lsm_inode_alloc(struct inode *inode);
1679 
1680 #endif /* ! __LINUX_LSM_HOOKS_H */
1681