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TOMOYO Linux Cross Reference
Linux/include/linux/lsm_hooks.h

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  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_set_creds:
 38  *      Save security information in the bprm->security field, typically based
 39  *      on information about the bprm->file, for later use by the apply_creds
 40  *      hook.  This hook may also optionally check permissions (e.g. for
 41  *      transitions between security domains).
 42  *      This hook may be called multiple times during a single execve, e.g. for
 43  *      interpreters.  The hook can tell whether it has already been called by
 44  *      checking to see if @bprm->security is non-NULL.  If so, then the hook
 45  *      may decide either to retain the security information saved earlier or
 46  *      to replace it.  The hook must set @bprm->secureexec to 1 if a "secure
 47  *      exec" has happened as a result of this hook call.  The flag is used to
 48  *      indicate the need for a sanitized execution environment, and is also
 49  *      passed in the ELF auxiliary table on the initial stack to indicate
 50  *      whether libc should enable secure mode.
 51  *      @bprm contains the linux_binprm structure.
 52  *      Return 0 if the hook is successful and permission is granted.
 53  * @bprm_check_security:
 54  *      This hook mediates the point when a search for a binary handler will
 55  *      begin.  It allows a check the @bprm->security value which is set in the
 56  *      preceding set_creds call.  The primary difference from set_creds is
 57  *      that the argv list and envp list are reliably available in @bprm.  This
 58  *      hook may be called multiple times during a single execve; and in each
 59  *      pass set_creds is called first.
 60  *      @bprm contains the linux_binprm structure.
 61  *      Return 0 if the hook is successful and permission is granted.
 62  * @bprm_committing_creds:
 63  *      Prepare to install the new security attributes of a process being
 64  *      transformed by an execve operation, based on the old credentials
 65  *      pointed to by @current->cred and the information set in @bprm->cred by
 66  *      the bprm_set_creds hook.  @bprm points to the linux_binprm structure.
 67  *      This hook is a good place to perform state changes on the process such
 68  *      as closing open file descriptors to which access will no longer be
 69  *      granted when the attributes are changed.  This is called immediately
 70  *      before commit_creds().
 71  * @bprm_committed_creds:
 72  *      Tidy up after the installation of the new security attributes of a
 73  *      process being transformed by an execve operation.  The new credentials
 74  *      have, by this point, been set to @current->cred.  @bprm points to the
 75  *      linux_binprm structure.  This hook is a good place to perform state
 76  *      changes on the process such as clearing out non-inheritable signal
 77  *      state.  This is called immediately after commit_creds().
 78  *
 79  * Security hooks for mount using fs_context.
 80  *      [See also Documentation/filesystems/mount_api.txt]
 81  *
 82  * @fs_context_dup:
 83  *      Allocate and attach a security structure to sc->security.  This pointer
 84  *      is initialised to NULL by the caller.
 85  *      @fc indicates the new filesystem context.
 86  *      @src_fc indicates the original filesystem context.
 87  * @fs_context_parse_param:
 88  *      Userspace provided a parameter to configure a superblock.  The LSM may
 89  *      reject it with an error and may use it for itself, in which case it
 90  *      should return 0; otherwise it should return -ENOPARAM to pass it on to
 91  *      the filesystem.
 92  *      @fc indicates the filesystem context.
 93  *      @param The parameter
 94  *
 95  * Security hooks for filesystem operations.
 96  *
 97  * @sb_alloc_security:
 98  *      Allocate and attach a security structure to the sb->s_security field.
 99  *      The s_security field is initialized to NULL when the structure is
100  *      allocated.
101  *      @sb contains the super_block structure to be modified.
102  *      Return 0 if operation was successful.
103  * @sb_free_security:
104  *      Deallocate and clear the sb->s_security field.
105  *      @sb contains the super_block structure to be modified.
106  * @sb_statfs:
107  *      Check permission before obtaining filesystem statistics for the @mnt
108  *      mountpoint.
109  *      @dentry is a handle on the superblock for the filesystem.
110  *      Return 0 if permission is granted.
111  * @sb_mount:
112  *      Check permission before an object specified by @dev_name is mounted on
113  *      the mount point named by @nd.  For an ordinary mount, @dev_name
114  *      identifies a device if the file system type requires a device.  For a
115  *      remount (@flags & MS_REMOUNT), @dev_name is irrelevant.  For a
116  *      loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
117  *      pathname of the object being mounted.
118  *      @dev_name contains the name for object being mounted.
119  *      @path contains the path for mount point object.
120  *      @type contains the filesystem type.
121  *      @flags contains the mount flags.
122  *      @data contains the filesystem-specific data.
123  *      Return 0 if permission is granted.
124  * @sb_copy_data:
125  *      Allow mount option data to be copied prior to parsing by the filesystem,
126  *      so that the security module can extract security-specific mount
127  *      options cleanly (a filesystem may modify the data e.g. with strsep()).
128  *      This also allows the original mount data to be stripped of security-
129  *      specific options to avoid having to make filesystems aware of them.
130  *      @orig the original mount data copied from userspace.
131  *      @copy copied data which will be passed to the security module.
132  *      Returns 0 if the copy was successful.
133  * @sb_remount:
134  *      Extracts security system specific mount options and verifies no changes
135  *      are being made to those options.
136  *      @sb superblock being remounted
137  *      @data contains the filesystem-specific data.
138  *      Return 0 if permission is granted.
139  * @sb_umount:
140  *      Check permission before the @mnt file system is unmounted.
141  *      @mnt contains the mounted file system.
142  *      @flags contains the unmount flags, e.g. MNT_FORCE.
143  *      Return 0 if permission is granted.
144  * @sb_pivotroot:
145  *      Check permission before pivoting the root filesystem.
146  *      @old_path contains the path for the new location of the
147  *      current root (put_old).
148  *      @new_path contains the path for the new root (new_root).
149  *      Return 0 if permission is granted.
150  * @sb_set_mnt_opts:
151  *      Set the security relevant mount options used for a superblock
152  *      @sb the superblock to set security mount options for
153  *      @opts binary data structure containing all lsm mount data
154  * @sb_clone_mnt_opts:
155  *      Copy all security options from a given superblock to another
156  *      @oldsb old superblock which contain information to clone
157  *      @newsb new superblock which needs filled in
158  * @sb_parse_opts_str:
159  *      Parse a string of security data filling in the opts structure
160  *      @options string containing all mount options known by the LSM
161  *      @opts binary data structure usable by the LSM
162  * @move_mount:
163  *      Check permission before a mount is moved.
164  *      @from_path indicates the mount that is going to be moved.
165  *      @to_path indicates the mountpoint that will be mounted upon.
166  * @dentry_init_security:
167  *      Compute a context for a dentry as the inode is not yet available
168  *      since NFSv4 has no label backed by an EA anyway.
169  *      @dentry dentry to use in calculating the context.
170  *      @mode mode used to determine resource type.
171  *      @name name of the last path component used to create file
172  *      @ctx pointer to place the pointer to the resulting context in.
173  *      @ctxlen point to place the length of the resulting context.
174  * @dentry_create_files_as:
175  *      Compute a context for a dentry as the inode is not yet available
176  *      and set that context in passed in creds so that new files are
177  *      created using that context. Context is calculated using the
178  *      passed in creds and not the creds of the caller.
179  *      @dentry dentry to use in calculating the context.
180  *      @mode mode used to determine resource type.
181  *      @name name of the last path component used to create file
182  *      @old creds which should be used for context calculation
183  *      @new creds to modify
184  *
185  *
186  * Security hooks for inode operations.
187  *
188  * @inode_alloc_security:
189  *      Allocate and attach a security structure to @inode->i_security.  The
190  *      i_security field is initialized to NULL when the inode structure is
191  *      allocated.
192  *      @inode contains the inode structure.
193  *      Return 0 if operation was successful.
194  * @inode_free_security:
195  *      @inode contains the inode structure.
196  *      Deallocate the inode security structure and set @inode->i_security to
197  *      NULL.
198  * @inode_init_security:
199  *      Obtain the security attribute name suffix and value to set on a newly
200  *      created inode and set up the incore security field for the new inode.
201  *      This hook is called by the fs code as part of the inode creation
202  *      transaction and provides for atomic labeling of the inode, unlike
203  *      the post_create/mkdir/... hooks called by the VFS.  The hook function
204  *      is expected to allocate the name and value via kmalloc, with the caller
205  *      being responsible for calling kfree after using them.
206  *      If the security module does not use security attributes or does
207  *      not wish to put a security attribute on this particular inode,
208  *      then it should return -EOPNOTSUPP to skip this processing.
209  *      @inode contains the inode structure of the newly created inode.
210  *      @dir contains the inode structure of the parent directory.
211  *      @qstr contains the last path component of the new object
212  *      @name will be set to the allocated name suffix (e.g. selinux).
213  *      @value will be set to the allocated attribute value.
214  *      @len will be set to the length of the value.
215  *      Returns 0 if @name and @value have been successfully set,
216  *      -EOPNOTSUPP if no security attribute is needed, or
217  *      -ENOMEM on memory allocation failure.
218  * @inode_create:
219  *      Check permission to create a regular file.
220  *      @dir contains inode structure of the parent of the new file.
221  *      @dentry contains the dentry structure for the file to be created.
222  *      @mode contains the file mode of the file to be created.
223  *      Return 0 if permission is granted.
224  * @inode_link:
225  *      Check permission before creating a new hard link to a file.
226  *      @old_dentry contains the dentry structure for an existing
227  *      link to the file.
228  *      @dir contains the inode structure of the parent directory
229  *      of the new link.
230  *      @new_dentry contains the dentry structure for the new link.
231  *      Return 0 if permission is granted.
232  * @path_link:
233  *      Check permission before creating a new hard link to a file.
234  *      @old_dentry contains the dentry structure for an existing link
235  *      to the file.
236  *      @new_dir contains the path structure of the parent directory of
237  *      the new link.
238  *      @new_dentry contains the dentry structure for the new link.
239  *      Return 0 if permission is granted.
240  * @inode_unlink:
241  *      Check the permission to remove a hard link to a file.
242  *      @dir contains the inode structure of parent directory of the file.
243  *      @dentry contains the dentry structure for file to be unlinked.
244  *      Return 0 if permission is granted.
245  * @path_unlink:
246  *      Check the permission to remove a hard link to a file.
247  *      @dir contains the path structure of parent directory of the file.
248  *      @dentry contains the dentry structure for file to be unlinked.
249  *      Return 0 if permission is granted.
250  * @inode_symlink:
251  *      Check the permission to create a symbolic link to a file.
252  *      @dir contains the inode structure of parent directory of
253  *      the symbolic link.
254  *      @dentry contains the dentry structure of the symbolic link.
255  *      @old_name contains the pathname of file.
256  *      Return 0 if permission is granted.
257  * @path_symlink:
258  *      Check the permission to create a symbolic link to a file.
259  *      @dir contains the path structure of parent directory of
260  *      the symbolic link.
261  *      @dentry contains the dentry structure of the symbolic link.
262  *      @old_name contains the pathname of file.
263  *      Return 0 if permission is granted.
264  * @inode_mkdir:
265  *      Check permissions to create a new directory in the existing directory
266  *      associated with inode structure @dir.
267  *      @dir contains the inode structure of parent of the directory
268  *      to be created.
269  *      @dentry contains the dentry structure of new directory.
270  *      @mode contains the mode of new directory.
271  *      Return 0 if permission is granted.
272  * @path_mkdir:
273  *      Check permissions to create a new directory in the existing directory
274  *      associated with path structure @path.
275  *      @dir contains the path structure of parent of the directory
276  *      to be created.
277  *      @dentry contains the dentry structure of new directory.
278  *      @mode contains the mode of new directory.
279  *      Return 0 if permission is granted.
280  * @inode_rmdir:
281  *      Check the permission to remove a directory.
282  *      @dir contains the inode structure of parent of the directory
283  *      to be removed.
284  *      @dentry contains the dentry structure of directory to be removed.
285  *      Return 0 if permission is granted.
286  * @path_rmdir:
287  *      Check the permission to remove a directory.
288  *      @dir contains the path structure of parent of the directory to be
289  *      removed.
290  *      @dentry contains the dentry structure of directory to be removed.
291  *      Return 0 if permission is granted.
292  * @inode_mknod:
293  *      Check permissions when creating a special file (or a socket or a fifo
294  *      file created via the mknod system call).  Note that if mknod operation
295  *      is being done for a regular file, then the create hook will be called
296  *      and not this hook.
297  *      @dir contains the inode structure of parent of the new file.
298  *      @dentry contains the dentry structure of the new file.
299  *      @mode contains the mode of the new file.
300  *      @dev contains the device number.
301  *      Return 0 if permission is granted.
302  * @path_mknod:
303  *      Check permissions when creating a file. Note that this hook is called
304  *      even if mknod operation is being done for a regular file.
305  *      @dir contains the path structure of parent of the new file.
306  *      @dentry contains the dentry structure of the new file.
307  *      @mode contains the mode of the new file.
308  *      @dev contains the undecoded device number. Use new_decode_dev() to get
309  *      the decoded device number.
310  *      Return 0 if permission is granted.
311  * @inode_rename:
312  *      Check for permission to rename a file or directory.
313  *      @old_dir contains the inode structure for parent of the old link.
314  *      @old_dentry contains the dentry structure of the old link.
315  *      @new_dir contains the inode structure for parent of the new link.
316  *      @new_dentry contains the dentry structure of the new link.
317  *      Return 0 if permission is granted.
318  * @path_rename:
319  *      Check for permission to rename a file or directory.
320  *      @old_dir contains the path structure for parent of the old link.
321  *      @old_dentry contains the dentry structure of the old link.
322  *      @new_dir contains the path structure for parent of the new link.
323  *      @new_dentry contains the dentry structure of the new link.
324  *      Return 0 if permission is granted.
325  * @path_chmod:
326  *      Check for permission to change a mode of the file @path. The new
327  *      mode is specified in @mode.
328  *      @path contains the path structure of the file to change the mode.
329  *      @mode contains the new DAC's permission, which is a bitmask of
330  *      constants from <include/uapi/linux/stat.h>
331  *      Return 0 if permission is granted.
332  * @path_chown:
333  *      Check for permission to change owner/group of a file or directory.
334  *      @path contains the path structure.
335  *      @uid contains new owner's ID.
336  *      @gid contains new group's ID.
337  *      Return 0 if permission is granted.
338  * @path_chroot:
339  *      Check for permission to change root directory.
340  *      @path contains the path structure.
341  *      Return 0 if permission is granted.
342  * @path_notify:
343  *      Check permissions before setting a watch on events as defined by @mask,
344  *      on an object at @path, whose type is defined by @obj_type.
345  * @inode_readlink:
346  *      Check the permission to read the symbolic link.
347  *      @dentry contains the dentry structure for the file link.
348  *      Return 0 if permission is granted.
349  * @inode_follow_link:
350  *      Check permission to follow a symbolic link when looking up a pathname.
351  *      @dentry contains the dentry structure for the link.
352  *      @inode contains the inode, which itself is not stable in RCU-walk
353  *      @rcu indicates whether we are in RCU-walk mode.
354  *      Return 0 if permission is granted.
355  * @inode_permission:
356  *      Check permission before accessing an inode.  This hook is called by the
357  *      existing Linux permission function, so a security module can use it to
358  *      provide additional checking for existing Linux permission checks.
359  *      Notice that this hook is called when a file is opened (as well as many
360  *      other operations), whereas the file_security_ops permission hook is
361  *      called when the actual read/write operations are performed.
362  *      @inode contains the inode structure to check.
363  *      @mask contains the permission mask.
364  *      Return 0 if permission is granted.
365  * @inode_setattr:
366  *      Check permission before setting file attributes.  Note that the kernel
367  *      call to notify_change is performed from several locations, whenever
368  *      file attributes change (such as when a file is truncated, chown/chmod
369  *      operations, transferring disk quotas, etc).
370  *      @dentry contains the dentry structure for the file.
371  *      @attr is the iattr structure containing the new file attributes.
372  *      Return 0 if permission is granted.
373  * @path_truncate:
374  *      Check permission before truncating a file.
375  *      @path contains the path structure for the file.
376  *      Return 0 if permission is granted.
377  * @inode_getattr:
378  *      Check permission before obtaining file attributes.
379  *      @path contains the path structure for the file.
380  *      Return 0 if permission is granted.
381  * @inode_setxattr:
382  *      Check permission before setting the extended attributes
383  *      @value identified by @name for @dentry.
384  *      Return 0 if permission is granted.
385  * @inode_post_setxattr:
386  *      Update inode security field after successful setxattr operation.
387  *      @value identified by @name for @dentry.
388  * @inode_getxattr:
389  *      Check permission before obtaining the extended attributes
390  *      identified by @name for @dentry.
391  *      Return 0 if permission is granted.
392  * @inode_listxattr:
393  *      Check permission before obtaining the list of extended attribute
394  *      names for @dentry.
395  *      Return 0 if permission is granted.
396  * @inode_removexattr:
397  *      Check permission before removing the extended attribute
398  *      identified by @name for @dentry.
399  *      Return 0 if permission is granted.
400  * @inode_getsecurity:
401  *      Retrieve a copy of the extended attribute representation of the
402  *      security label associated with @name for @inode via @buffer.  Note that
403  *      @name is the remainder of the attribute name after the security prefix
404  *      has been removed. @alloc is used to specify of the call should return a
405  *      value via the buffer or just the value length Return size of buffer on
406  *      success.
407  * @inode_setsecurity:
408  *      Set the security label associated with @name for @inode from the
409  *      extended attribute value @value.  @size indicates the size of the
410  *      @value in bytes.  @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
411  *      Note that @name is the remainder of the attribute name after the
412  *      security. prefix has been removed.
413  *      Return 0 on success.
414  * @inode_listsecurity:
415  *      Copy the extended attribute names for the security labels
416  *      associated with @inode into @buffer.  The maximum size of @buffer
417  *      is specified by @buffer_size.  @buffer may be NULL to request
418  *      the size of the buffer required.
419  *      Returns number of bytes used/required on success.
420  * @inode_need_killpriv:
421  *      Called when an inode has been changed.
422  *      @dentry is the dentry being changed.
423  *      Return <0 on error to abort the inode change operation.
424  *      Return 0 if inode_killpriv does not need to be called.
425  *      Return >0 if inode_killpriv does need to be called.
426  * @inode_killpriv:
427  *      The setuid bit is being removed.  Remove similar security labels.
428  *      Called with the dentry->d_inode->i_mutex held.
429  *      @dentry is the dentry being changed.
430  *      Return 0 on success.  If error is returned, then the operation
431  *      causing setuid bit removal is failed.
432  * @inode_getsecid:
433  *      Get the secid associated with the node.
434  *      @inode contains a pointer to the inode.
435  *      @secid contains a pointer to the location where result will be saved.
436  *      In case of failure, @secid will be set to zero.
437  * @inode_copy_up:
438  *      A file is about to be copied up from lower layer to upper layer of
439  *      overlay filesystem. Security module can prepare a set of new creds
440  *      and modify as need be and return new creds. Caller will switch to
441  *      new creds temporarily to create new file and release newly allocated
442  *      creds.
443  *      @src indicates the union dentry of file that is being copied up.
444  *      @new pointer to pointer to return newly allocated creds.
445  *      Returns 0 on success or a negative error code on error.
446  * @inode_copy_up_xattr:
447  *      Filter the xattrs being copied up when a unioned file is copied
448  *      up from a lower layer to the union/overlay layer.
449  *      @name indicates the name of the xattr.
450  *      Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP if
451  *      security module does not know about attribute or a negative error code
452  *      to abort the copy up. Note that the caller is responsible for reading
453  *      and writing the xattrs as this hook is merely a filter.
454  *
455  * Security hooks for kernfs node operations
456  *
457  * @kernfs_init_security:
458  *      Initialize the security context of a newly created kernfs node based
459  *      on its own and its parent's attributes.
460  *
461  *      @kn_dir the parent kernfs node
462  *      @kn the new child kernfs node
463  *
464  * Security hooks for file operations
465  *
466  * @file_permission:
467  *      Check file permissions before accessing an open file.  This hook is
468  *      called by various operations that read or write files.  A security
469  *      module can use this hook to perform additional checking on these
470  *      operations, e.g.  to revalidate permissions on use to support privilege
471  *      bracketing or policy changes.  Notice that this hook is used when the
472  *      actual read/write operations are performed, whereas the
473  *      inode_security_ops hook is called when a file is opened (as well as
474  *      many other operations).
475  *      Caveat:  Although this hook can be used to revalidate permissions for
476  *      various system call operations that read or write files, it does not
477  *      address the revalidation of permissions for memory-mapped files.
478  *      Security modules must handle this separately if they need such
479  *      revalidation.
480  *      @file contains the file structure being accessed.
481  *      @mask contains the requested permissions.
482  *      Return 0 if permission is granted.
483  * @file_alloc_security:
484  *      Allocate and attach a security structure to the file->f_security field.
485  *      The security field is initialized to NULL when the structure is first
486  *      created.
487  *      @file contains the file structure to secure.
488  *      Return 0 if the hook is successful and permission is granted.
489  * @file_free_security:
490  *      Deallocate and free any security structures stored in file->f_security.
491  *      @file contains the file structure being modified.
492  * @file_ioctl:
493  *      @file contains the file structure.
494  *      @cmd contains the operation to perform.
495  *      @arg contains the operational arguments.
496  *      Check permission for an ioctl operation on @file.  Note that @arg
497  *      sometimes represents a user space pointer; in other cases, it may be a
498  *      simple integer value.  When @arg represents a user space pointer, it
499  *      should never be used by the security module.
500  *      Return 0 if permission is granted.
501  * @mmap_addr :
502  *      Check permissions for a mmap operation at @addr.
503  *      @addr contains virtual address that will be used for the operation.
504  *      Return 0 if permission is granted.
505  * @mmap_file :
506  *      Check permissions for a mmap operation.  The @file may be NULL, e.g.
507  *      if mapping anonymous memory.
508  *      @file contains the file structure for file to map (may be NULL).
509  *      @reqprot contains the protection requested by the application.
510  *      @prot contains the protection that will be applied by the kernel.
511  *      @flags contains the operational flags.
512  *      Return 0 if permission is granted.
513  * @file_mprotect:
514  *      Check permissions before changing memory access permissions.
515  *      @vma contains the memory region to modify.
516  *      @reqprot contains the protection requested by the application.
517  *      @prot contains the protection that will be applied by the kernel.
518  *      Return 0 if permission is granted.
519  * @file_lock:
520  *      Check permission before performing file locking operations.
521  *      Note the hook mediates both flock and fcntl style locks.
522  *      @file contains the file structure.
523  *      @cmd contains the posix-translated lock operation to perform
524  *      (e.g. F_RDLCK, F_WRLCK).
525  *      Return 0 if permission is granted.
526  * @file_fcntl:
527  *      Check permission before allowing the file operation specified by @cmd
528  *      from being performed on the file @file.  Note that @arg sometimes
529  *      represents a user space pointer; in other cases, it may be a simple
530  *      integer value.  When @arg represents a user space pointer, it should
531  *      never be used by the security module.
532  *      @file contains the file structure.
533  *      @cmd contains the operation to be performed.
534  *      @arg contains the operational arguments.
535  *      Return 0 if permission is granted.
536  * @file_set_fowner:
537  *      Save owner security information (typically from current->security) in
538  *      file->f_security for later use by the send_sigiotask hook.
539  *      @file contains the file structure to update.
540  *      Return 0 on success.
541  * @file_send_sigiotask:
542  *      Check permission for the file owner @fown to send SIGIO or SIGURG to the
543  *      process @tsk.  Note that this hook is sometimes called from interrupt.
544  *      Note that the fown_struct, @fown, is never outside the context of a
545  *      struct file, so the file structure (and associated security information)
546  *      can always be obtained: container_of(fown, struct file, f_owner)
547  *      @tsk contains the structure of task receiving signal.
548  *      @fown contains the file owner information.
549  *      @sig is the signal that will be sent.  When 0, kernel sends SIGIO.
550  *      Return 0 if permission is granted.
551  * @file_receive:
552  *      This hook allows security modules to control the ability of a process
553  *      to receive an open file descriptor via socket IPC.
554  *      @file contains the file structure being received.
555  *      Return 0 if permission is granted.
556  * @file_open:
557  *      Save open-time permission checking state for later use upon
558  *      file_permission, and recheck access if anything has changed
559  *      since inode_permission.
560  *
561  * Security hooks for task operations.
562  *
563  * @task_alloc:
564  *      @task task being allocated.
565  *      @clone_flags contains the flags indicating what should be shared.
566  *      Handle allocation of task-related resources.
567  *      Returns a zero on success, negative values on failure.
568  * @task_free:
569  *      @task task about to be freed.
570  *      Handle release of task-related resources. (Note that this can be called
571  *      from interrupt context.)
572  * @cred_alloc_blank:
573  *      @cred points to the credentials.
574  *      @gfp indicates the atomicity of any memory allocations.
575  *      Only allocate sufficient memory and attach to @cred such that
576  *      cred_transfer() will not get ENOMEM.
577  * @cred_free:
578  *      @cred points to the credentials.
579  *      Deallocate and clear the cred->security field in a set of credentials.
580  * @cred_prepare:
581  *      @new points to the new credentials.
582  *      @old points to the original credentials.
583  *      @gfp indicates the atomicity of any memory allocations.
584  *      Prepare a new set of credentials by copying the data from the old set.
585  * @cred_transfer:
586  *      @new points to the new credentials.
587  *      @old points to the original credentials.
588  *      Transfer data from original creds to new creds
589  * @cred_getsecid:
590  *      Retrieve the security identifier of the cred structure @c
591  *      @c contains the credentials, secid will be placed into @secid.
592  *      In case of failure, @secid will be set to zero.
593  * @kernel_act_as:
594  *      Set the credentials for a kernel service to act as (subjective context).
595  *      @new points to the credentials to be modified.
596  *      @secid specifies the security ID to be set
597  *      The current task must be the one that nominated @secid.
598  *      Return 0 if successful.
599  * @kernel_create_files_as:
600  *      Set the file creation context in a set of credentials to be the same as
601  *      the objective context of the specified inode.
602  *      @new points to the credentials to be modified.
603  *      @inode points to the inode to use as a reference.
604  *      The current task must be the one that nominated @inode.
605  *      Return 0 if successful.
606  * @kernel_module_request:
607  *      Ability to trigger the kernel to automatically upcall to userspace for
608  *      userspace to load a kernel module with the given name.
609  *      @kmod_name name of the module requested by the kernel
610  *      Return 0 if successful.
611  * @kernel_load_data:
612  *      Load data provided by userspace.
613  *      @id kernel load data identifier
614  *      Return 0 if permission is granted.
615  * @kernel_read_file:
616  *      Read a file specified by userspace.
617  *      @file contains the file structure pointing to the file being read
618  *      by the kernel.
619  *      @id kernel read file identifier
620  *      Return 0 if permission is granted.
621  * @kernel_post_read_file:
622  *      Read a file specified by userspace.
623  *      @file contains the file structure pointing to the file being read
624  *      by the kernel.
625  *      @buf pointer to buffer containing the file contents.
626  *      @size length of the file contents.
627  *      @id kernel read file identifier
628  *      Return 0 if permission is granted.
629  * @task_fix_setuid:
630  *      Update the module's state after setting one or more of the user
631  *      identity attributes of the current process.  The @flags parameter
632  *      indicates which of the set*uid system calls invoked this hook.  If
633  *      @new is the set of credentials that will be installed.  Modifications
634  *      should be made to this rather than to @current->cred.
635  *      @old is the set of credentials that are being replaces
636  *      @flags contains one of the LSM_SETID_* values.
637  *      Return 0 on success.
638  * @task_setpgid:
639  *      Check permission before setting the process group identifier of the
640  *      process @p to @pgid.
641  *      @p contains the task_struct for process being modified.
642  *      @pgid contains the new pgid.
643  *      Return 0 if permission is granted.
644  * @task_getpgid:
645  *      Check permission before getting the process group identifier of the
646  *      process @p.
647  *      @p contains the task_struct for the process.
648  *      Return 0 if permission is granted.
649  * @task_getsid:
650  *      Check permission before getting the session identifier of the process
651  *      @p.
652  *      @p contains the task_struct for the process.
653  *      Return 0 if permission is granted.
654  * @task_getsecid:
655  *      Retrieve the security identifier of the process @p.
656  *      @p contains the task_struct for the process and place is into @secid.
657  *      In case of failure, @secid will be set to zero.
658  *
659  * @task_setnice:
660  *      Check permission before setting the nice value of @p to @nice.
661  *      @p contains the task_struct of process.
662  *      @nice contains the new nice value.
663  *      Return 0 if permission is granted.
664  * @task_setioprio:
665  *      Check permission before setting the ioprio value of @p to @ioprio.
666  *      @p contains the task_struct of process.
667  *      @ioprio contains the new ioprio value
668  *      Return 0 if permission is granted.
669  * @task_getioprio:
670  *      Check permission before getting the ioprio value of @p.
671  *      @p contains the task_struct of process.
672  *      Return 0 if permission is granted.
673  * @task_prlimit:
674  *      Check permission before getting and/or setting the resource limits of
675  *      another task.
676  *      @cred points to the cred structure for the current task.
677  *      @tcred points to the cred structure for the target task.
678  *      @flags contains the LSM_PRLIMIT_* flag bits indicating whether the
679  *      resource limits are being read, modified, or both.
680  *      Return 0 if permission is granted.
681  * @task_setrlimit:
682  *      Check permission before setting the resource limits of process @p
683  *      for @resource to @new_rlim.  The old resource limit values can
684  *      be examined by dereferencing (p->signal->rlim + resource).
685  *      @p points to the task_struct for the target task's group leader.
686  *      @resource contains the resource whose limit is being set.
687  *      @new_rlim contains the new limits for @resource.
688  *      Return 0 if permission is granted.
689  * @task_setscheduler:
690  *      Check permission before setting scheduling policy and/or parameters of
691  *      process @p.
692  *      @p contains the task_struct for process.
693  *      Return 0 if permission is granted.
694  * @task_getscheduler:
695  *      Check permission before obtaining scheduling information for process
696  *      @p.
697  *      @p contains the task_struct for process.
698  *      Return 0 if permission is granted.
699  * @task_movememory:
700  *      Check permission before moving memory owned by process @p.
701  *      @p contains the task_struct for process.
702  *      Return 0 if permission is granted.
703  * @task_kill:
704  *      Check permission before sending signal @sig to @p.  @info can be NULL,
705  *      the constant 1, or a pointer to a kernel_siginfo structure.  If @info is 1 or
706  *      SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
707  *      from the kernel and should typically be permitted.
708  *      SIGIO signals are handled separately by the send_sigiotask hook in
709  *      file_security_ops.
710  *      @p contains the task_struct for process.
711  *      @info contains the signal information.
712  *      @sig contains the signal value.
713  *      @cred contains the cred of the process where the signal originated, or
714  *      NULL if the current task is the originator.
715  *      Return 0 if permission is granted.
716  * @task_prctl:
717  *      Check permission before performing a process control operation on the
718  *      current process.
719  *      @option contains the operation.
720  *      @arg2 contains a argument.
721  *      @arg3 contains a argument.
722  *      @arg4 contains a argument.
723  *      @arg5 contains a argument.
724  *      Return -ENOSYS if no-one wanted to handle this op, any other value to
725  *      cause prctl() to return immediately with that value.
726  * @task_to_inode:
727  *      Set the security attributes for an inode based on an associated task's
728  *      security attributes, e.g. for /proc/pid inodes.
729  *      @p contains the task_struct for the task.
730  *      @inode contains the inode structure for the inode.
731  *
732  * Security hooks for Netlink messaging.
733  *
734  * @netlink_send:
735  *      Save security information for a netlink message so that permission
736  *      checking can be performed when the message is processed.  The security
737  *      information can be saved using the eff_cap field of the
738  *      netlink_skb_parms structure.  Also may be used to provide fine
739  *      grained control over message transmission.
740  *      @sk associated sock of task sending the message.
741  *      @skb contains the sk_buff structure for the netlink message.
742  *      Return 0 if the information was successfully saved and message
743  *      is allowed to be transmitted.
744  *
745  * Security hooks for Unix domain networking.
746  *
747  * @unix_stream_connect:
748  *      Check permissions before establishing a Unix domain stream connection
749  *      between @sock and @other.
750  *      @sock contains the sock structure.
751  *      @other contains the peer sock structure.
752  *      @newsk contains the new sock structure.
753  *      Return 0 if permission is granted.
754  * @unix_may_send:
755  *      Check permissions before connecting or sending datagrams from @sock to
756  *      @other.
757  *      @sock contains the socket structure.
758  *      @other contains the peer socket structure.
759  *      Return 0 if permission is granted.
760  *
761  * The @unix_stream_connect and @unix_may_send hooks were necessary because
762  * Linux provides an alternative to the conventional file name space for Unix
763  * domain sockets.  Whereas binding and connecting to sockets in the file name
764  * space is mediated by the typical file permissions (and caught by the mknod
765  * and permission hooks in inode_security_ops), binding and connecting to
766  * sockets in the abstract name space is completely unmediated.  Sufficient
767  * control of Unix domain sockets in the abstract name space isn't possible
768  * using only the socket layer hooks, since we need to know the actual target
769  * socket, which is not looked up until we are inside the af_unix code.
770  *
771  * Security hooks for socket operations.
772  *
773  * @socket_create:
774  *      Check permissions prior to creating a new socket.
775  *      @family contains the requested protocol family.
776  *      @type contains the requested communications type.
777  *      @protocol contains the requested protocol.
778  *      @kern set to 1 if a kernel socket.
779  *      Return 0 if permission is granted.
780  * @socket_post_create:
781  *      This hook allows a module to update or allocate a per-socket security
782  *      structure. Note that the security field was not added directly to the
783  *      socket structure, but rather, the socket security information is stored
784  *      in the associated inode.  Typically, the inode alloc_security hook will
785  *      allocate and and attach security information to
786  *      SOCK_INODE(sock)->i_security.  This hook may be used to update the
787  *      SOCK_INODE(sock)->i_security field with additional information that
788  *      wasn't available when the inode was allocated.
789  *      @sock contains the newly created socket structure.
790  *      @family contains the requested protocol family.
791  *      @type contains the requested communications type.
792  *      @protocol contains the requested protocol.
793  *      @kern set to 1 if a kernel socket.
794  * @socket_socketpair:
795  *      Check permissions before creating a fresh pair of sockets.
796  *      @socka contains the first socket structure.
797  *      @sockb contains the second socket structure.
798  *      Return 0 if permission is granted and the connection was established.
799  * @socket_bind:
800  *      Check permission before socket protocol layer bind operation is
801  *      performed and the socket @sock is bound to the address specified in the
802  *      @address parameter.
803  *      @sock contains the socket structure.
804  *      @address contains the address to bind to.
805  *      @addrlen contains the length of address.
806  *      Return 0 if permission is granted.
807  * @socket_connect:
808  *      Check permission before socket protocol layer connect operation
809  *      attempts to connect socket @sock to a remote address, @address.
810  *      @sock contains the socket structure.
811  *      @address contains the address of remote endpoint.
812  *      @addrlen contains the length of address.
813  *      Return 0 if permission is granted.
814  * @socket_listen:
815  *      Check permission before socket protocol layer listen operation.
816  *      @sock contains the socket structure.
817  *      @backlog contains the maximum length for the pending connection queue.
818  *      Return 0 if permission is granted.
819  * @socket_accept:
820  *      Check permission before accepting a new connection.  Note that the new
821  *      socket, @newsock, has been created and some information copied to it,
822  *      but the accept operation has not actually been performed.
823  *      @sock contains the listening socket structure.
824  *      @newsock contains the newly created server socket for connection.
825  *      Return 0 if permission is granted.
826  * @socket_sendmsg:
827  *      Check permission before transmitting a message to another socket.
828  *      @sock contains the socket structure.
829  *      @msg contains the message to be transmitted.
830  *      @size contains the size of message.
831  *      Return 0 if permission is granted.
832  * @socket_recvmsg:
833  *      Check permission before receiving a message from a socket.
834  *      @sock contains the socket structure.
835  *      @msg contains the message structure.
836  *      @size contains the size of message structure.
837  *      @flags contains the operational flags.
838  *      Return 0 if permission is granted.
839  * @socket_getsockname:
840  *      Check permission before the local address (name) of the socket object
841  *      @sock is retrieved.
842  *      @sock contains the socket structure.
843  *      Return 0 if permission is granted.
844  * @socket_getpeername:
845  *      Check permission before the remote address (name) of a socket object
846  *      @sock is retrieved.
847  *      @sock contains the socket structure.
848  *      Return 0 if permission is granted.
849  * @socket_getsockopt:
850  *      Check permissions before retrieving the options associated with socket
851  *      @sock.
852  *      @sock contains the socket structure.
853  *      @level contains the protocol level to retrieve option from.
854  *      @optname contains the name of option to retrieve.
855  *      Return 0 if permission is granted.
856  * @socket_setsockopt:
857  *      Check permissions before setting the options associated with socket
858  *      @sock.
859  *      @sock contains the socket structure.
860  *      @level contains the protocol level to set options for.
861  *      @optname contains the name of the option to set.
862  *      Return 0 if permission is granted.
863  * @socket_shutdown:
864  *      Checks permission before all or part of a connection on the socket
865  *      @sock is shut down.
866  *      @sock contains the socket structure.
867  *      @how contains the flag indicating how future sends and receives
868  *      are handled.
869  *      Return 0 if permission is granted.
870  * @socket_sock_rcv_skb:
871  *      Check permissions on incoming network packets.  This hook is distinct
872  *      from Netfilter's IP input hooks since it is the first time that the
873  *      incoming sk_buff @skb has been associated with a particular socket, @sk.
874  *      Must not sleep inside this hook because some callers hold spinlocks.
875  *      @sk contains the sock (not socket) associated with the incoming sk_buff.
876  *      @skb contains the incoming network data.
877  * @socket_getpeersec_stream:
878  *      This hook allows the security module to provide peer socket security
879  *      state for unix or connected tcp sockets to userspace via getsockopt
880  *      SO_GETPEERSEC.  For tcp sockets this can be meaningful if the
881  *      socket is associated with an ipsec SA.
882  *      @sock is the local socket.
883  *      @optval userspace memory where the security state is to be copied.
884  *      @optlen userspace int where the module should copy the actual length
885  *      of the security state.
886  *      @len as input is the maximum length to copy to userspace provided
887  *      by the caller.
888  *      Return 0 if all is well, otherwise, typical getsockopt return
889  *      values.
890  * @socket_getpeersec_dgram:
891  *      This hook allows the security module to provide peer socket security
892  *      state for udp sockets on a per-packet basis to userspace via
893  *      getsockopt SO_GETPEERSEC. The application must first have indicated
894  *      the IP_PASSSEC option via getsockopt. It can then retrieve the
895  *      security state returned by this hook for a packet via the SCM_SECURITY
896  *      ancillary message type.
897  *      @sock contains the peer socket. May be NULL.
898  *      @skb is the sk_buff for the packet being queried. May be NULL.
899  *      @secid pointer to store the secid of the packet.
900  *      Return 0 on success, error on failure.
901  * @sk_alloc_security:
902  *      Allocate and attach a security structure to the sk->sk_security field,
903  *      which is used to copy security attributes between local stream sockets.
904  * @sk_free_security:
905  *      Deallocate security structure.
906  * @sk_clone_security:
907  *      Clone/copy security structure.
908  * @sk_getsecid:
909  *      Retrieve the LSM-specific secid for the sock to enable caching
910  *      of network authorizations.
911  * @sock_graft:
912  *      Sets the socket's isec sid to the sock's sid.
913  * @inet_conn_request:
914  *      Sets the openreq's sid to socket's sid with MLS portion taken
915  *      from peer sid.
916  * @inet_csk_clone:
917  *      Sets the new child socket's sid to the openreq sid.
918  * @inet_conn_established:
919  *      Sets the connection's peersid to the secmark on skb.
920  * @secmark_relabel_packet:
921  *      check if the process should be allowed to relabel packets to
922  *      the given secid
923  * @secmark_refcount_inc:
924  *      tells the LSM to increment the number of secmark labeling rules loaded
925  * @secmark_refcount_dec:
926  *      tells the LSM to decrement the number of secmark labeling rules loaded
927  * @req_classify_flow:
928  *      Sets the flow's sid to the openreq sid.
929  * @tun_dev_alloc_security:
930  *      This hook allows a module to allocate a security structure for a TUN
931  *      device.
932  *      @security pointer to a security structure pointer.
933  *      Returns a zero on success, negative values on failure.
934  * @tun_dev_free_security:
935  *      This hook allows a module to free the security structure for a TUN
936  *      device.
937  *      @security pointer to the TUN device's security structure
938  * @tun_dev_create:
939  *      Check permissions prior to creating a new TUN device.
940  * @tun_dev_attach_queue:
941  *      Check permissions prior to attaching to a TUN device queue.
942  *      @security pointer to the TUN device's security structure.
943  * @tun_dev_attach:
944  *      This hook can be used by the module to update any security state
945  *      associated with the TUN device's sock structure.
946  *      @sk contains the existing sock structure.
947  *      @security pointer to the TUN device's security structure.
948  * @tun_dev_open:
949  *      This hook can be used by the module to update any security state
950  *      associated with the TUN device's security structure.
951  *      @security pointer to the TUN devices's security structure.
952  *
953  * Security hooks for SCTP
954  *
955  * @sctp_assoc_request:
956  *      Passes the @ep and @chunk->skb of the association INIT packet to
957  *      the security module.
958  *      @ep pointer to sctp endpoint structure.
959  *      @skb pointer to skbuff of association packet.
960  *      Return 0 on success, error on failure.
961  * @sctp_bind_connect:
962  *      Validiate permissions required for each address associated with sock
963  *      @sk. Depending on @optname, the addresses will be treated as either
964  *      for a connect or bind service. The @addrlen is calculated on each
965  *      ipv4 and ipv6 address using sizeof(struct sockaddr_in) or
966  *      sizeof(struct sockaddr_in6).
967  *      @sk pointer to sock structure.
968  *      @optname name of the option to validate.
969  *      @address list containing one or more ipv4/ipv6 addresses.
970  *      @addrlen total length of address(s).
971  *      Return 0 on success, error on failure.
972  * @sctp_sk_clone:
973  *      Called whenever a new socket is created by accept(2) (i.e. a TCP
974  *      style socket) or when a socket is 'peeled off' e.g userspace
975  *      calls sctp_peeloff(3).
976  *      @ep pointer to current sctp endpoint structure.
977  *      @sk pointer to current sock structure.
978  *      @sk pointer to new sock structure.
979  *
980  * Security hooks for Infiniband
981  *
982  * @ib_pkey_access:
983  *      Check permission to access a pkey when modifing a QP.
984  *      @subnet_prefix the subnet prefix of the port being used.
985  *      @pkey the pkey to be accessed.
986  *      @sec pointer to a security structure.
987  * @ib_endport_manage_subnet:
988  *      Check permissions to send and receive SMPs on a end port.
989  *      @dev_name the IB device name (i.e. mlx4_0).
990  *      @port_num the port number.
991  *      @sec pointer to a security structure.
992  * @ib_alloc_security:
993  *      Allocate a security structure for Infiniband objects.
994  *      @sec pointer to a security structure pointer.
995  *      Returns 0 on success, non-zero on failure
996  * @ib_free_security:
997  *      Deallocate an Infiniband security structure.
998  *      @sec contains the security structure to be freed.
999  *
1000  * Security hooks for XFRM operations.
1001  *
1002  * @xfrm_policy_alloc_security:
1003  *      @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
1004  *      Database used by the XFRM system.
1005  *      @sec_ctx contains the security context information being provided by
1006  *      the user-level policy update program (e.g., setkey).
1007  *      Allocate a security structure to the xp->security field; the security
1008  *      field is initialized to NULL when the xfrm_policy is allocated.
1009  *      Return 0 if operation was successful (memory to allocate, legal context)
1010  *      @gfp is to specify the context for the allocation
1011  * @xfrm_policy_clone_security:
1012  *      @old_ctx contains an existing xfrm_sec_ctx.
1013  *      @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
1014  *      Allocate a security structure in new_ctxp that contains the
1015  *      information from the old_ctx structure.
1016  *      Return 0 if operation was successful (memory to allocate).
1017  * @xfrm_policy_free_security:
1018  *      @ctx contains the xfrm_sec_ctx
1019  *      Deallocate xp->security.
1020  * @xfrm_policy_delete_security:
1021  *      @ctx contains the xfrm_sec_ctx.
1022  *      Authorize deletion of xp->security.
1023  * @xfrm_state_alloc:
1024  *      @x contains the xfrm_state being added to the Security Association
1025  *      Database by the XFRM system.
1026  *      @sec_ctx contains the security context information being provided by
1027  *      the user-level SA generation program (e.g., setkey or racoon).
1028  *      Allocate a security structure to the x->security field; the security
1029  *      field is initialized to NULL when the xfrm_state is allocated. Set the
1030  *      context to correspond to sec_ctx. Return 0 if operation was successful
1031  *      (memory to allocate, legal context).
1032  * @xfrm_state_alloc_acquire:
1033  *      @x contains the xfrm_state being added to the Security Association
1034  *      Database by the XFRM system.
1035  *      @polsec contains the policy's security context.
1036  *      @secid contains the secid from which to take the mls portion of the
1037  *      context.
1038  *      Allocate a security structure to the x->security field; the security
1039  *      field is initialized to NULL when the xfrm_state is allocated. Set the
1040  *      context to correspond to secid. Return 0 if operation was successful
1041  *      (memory to allocate, legal context).
1042  * @xfrm_state_free_security:
1043  *      @x contains the xfrm_state.
1044  *      Deallocate x->security.
1045  * @xfrm_state_delete_security:
1046  *      @x contains the xfrm_state.
1047  *      Authorize deletion of x->security.
1048  * @xfrm_policy_lookup:
1049  *      @ctx contains the xfrm_sec_ctx for which the access control is being
1050  *      checked.
1051  *      @fl_secid contains the flow security label that is used to authorize
1052  *      access to the policy xp.
1053  *      @dir contains the direction of the flow (input or output).
1054  *      Check permission when a flow selects a xfrm_policy for processing
1055  *      XFRMs on a packet.  The hook is called when selecting either a
1056  *      per-socket policy or a generic xfrm policy.
1057  *      Return 0 if permission is granted, -ESRCH otherwise, or -errno
1058  *      on other errors.
1059  * @xfrm_state_pol_flow_match:
1060  *      @x contains the state to match.
1061  *      @xp contains the policy to check for a match.
1062  *      @fl contains the flow to check for a match.
1063  *      Return 1 if there is a match.
1064  * @xfrm_decode_session:
1065  *      @skb points to skb to decode.
1066  *      @secid points to the flow key secid to set.
1067  *      @ckall says if all xfrms used should be checked for same secid.
1068  *      Return 0 if ckall is zero or all xfrms used have the same secid.
1069  *
1070  * Security hooks affecting all Key Management operations
1071  *
1072  * @key_alloc:
1073  *      Permit allocation of a key and assign security data. Note that key does
1074  *      not have a serial number assigned at this point.
1075  *      @key points to the key.
1076  *      @flags is the allocation flags
1077  *      Return 0 if permission is granted, -ve error otherwise.
1078  * @key_free:
1079  *      Notification of destruction; free security data.
1080  *      @key points to the key.
1081  *      No return value.
1082  * @key_permission:
1083  *      See whether a specific operational right is granted to a process on a
1084  *      key.
1085  *      @key_ref refers to the key (key pointer + possession attribute bit).
1086  *      @cred points to the credentials to provide the context against which to
1087  *      evaluate the security data on the key.
1088  *      @perm describes the combination of permissions required of this key.
1089  *      Return 0 if permission is granted, -ve error otherwise.
1090  * @key_getsecurity:
1091  *      Get a textual representation of the security context attached to a key
1092  *      for the purposes of honouring KEYCTL_GETSECURITY.  This function
1093  *      allocates the storage for the NUL-terminated string and the caller
1094  *      should free it.
1095  *      @key points to the key to be queried.
1096  *      @_buffer points to a pointer that should be set to point to the
1097  *      resulting string (if no label or an error occurs).
1098  *      Return the length of the string (including terminating NUL) or -ve if
1099  *      an error.
1100  *      May also return 0 (and a NULL buffer pointer) if there is no label.
1101  *
1102  * Security hooks affecting all System V IPC operations.
1103  *
1104  * @ipc_permission:
1105  *      Check permissions for access to IPC
1106  *      @ipcp contains the kernel IPC permission structure
1107  *      @flag contains the desired (requested) permission set
1108  *      Return 0 if permission is granted.
1109  * @ipc_getsecid:
1110  *      Get the secid associated with the ipc object.
1111  *      @ipcp contains the kernel IPC permission structure.
1112  *      @secid contains a pointer to the location where result will be saved.
1113  *      In case of failure, @secid will be set to zero.
1114  *
1115  * Security hooks for individual messages held in System V IPC message queues
1116  * @msg_msg_alloc_security:
1117  *      Allocate and attach a security structure to the msg->security field.
1118  *      The security field is initialized to NULL when the structure is first
1119  *      created.
1120  *      @msg contains the message structure to be modified.
1121  *      Return 0 if operation was successful and permission is granted.
1122  * @msg_msg_free_security:
1123  *      Deallocate the security structure for this message.
1124  *      @msg contains the message structure to be modified.
1125  *
1126  * Security hooks for System V IPC Message Queues
1127  *
1128  * @msg_queue_alloc_security:
1129  *      Allocate and attach a security structure to the
1130  *      @perm->security field. The security field is initialized to
1131  *      NULL when the structure is first created.
1132  *      @perm contains the IPC permissions of the message queue.
1133  *      Return 0 if operation was successful and permission is granted.
1134  * @msg_queue_free_security:
1135  *      Deallocate security field @perm->security for the message queue.
1136  *      @perm contains the IPC permissions of the message queue.
1137  * @msg_queue_associate:
1138  *      Check permission when a message queue is requested through the
1139  *      msgget system call. This hook is only called when returning the
1140  *      message queue identifier for an existing message queue, not when a
1141  *      new message queue is created.
1142  *      @perm contains the IPC permissions of the message queue.
1143  *      @msqflg contains the operation control flags.
1144  *      Return 0 if permission is granted.
1145  * @msg_queue_msgctl:
1146  *      Check permission when a message control operation specified by @cmd
1147  *      is to be performed on the message queue with permissions @perm.
1148  *      The @perm may be NULL, e.g. for IPC_INFO or MSG_INFO.
1149  *      @perm contains the IPC permissions of the msg queue. May be NULL.
1150  *      @cmd contains the operation to be performed.
1151  *      Return 0 if permission is granted.
1152  * @msg_queue_msgsnd:
1153  *      Check permission before a message, @msg, is enqueued on the message
1154  *      queue with permissions @perm.
1155  *      @perm contains the IPC permissions of the message queue.
1156  *      @msg contains the message to be enqueued.
1157  *      @msqflg contains operational flags.
1158  *      Return 0 if permission is granted.
1159  * @msg_queue_msgrcv:
1160  *      Check permission before a message, @msg, is removed from the message
1161  *      queue. The @target task structure contains a pointer to the
1162  *      process that will be receiving the message (not equal to the current
1163  *      process when inline receives are being performed).
1164  *      @perm contains the IPC permissions of the message queue.
1165  *      @msg contains the message destination.
1166  *      @target contains the task structure for recipient process.
1167  *      @type contains the type of message requested.
1168  *      @mode contains the operational flags.
1169  *      Return 0 if permission is granted.
1170  *
1171  * Security hooks for System V Shared Memory Segments
1172  *
1173  * @shm_alloc_security:
1174  *      Allocate and attach a security structure to the @perm->security
1175  *      field. The security field is initialized to NULL when the structure is
1176  *      first created.
1177  *      @perm contains the IPC permissions of the shared memory structure.
1178  *      Return 0 if operation was successful and permission is granted.
1179  * @shm_free_security:
1180  *      Deallocate the security structure @perm->security for the memory segment.
1181  *      @perm contains the IPC permissions of the shared memory structure.
1182  * @shm_associate:
1183  *      Check permission when a shared memory region is requested through the
1184  *      shmget system call. This hook is only called when returning the shared
1185  *      memory region identifier for an existing region, not when a new shared
1186  *      memory region is created.
1187  *      @perm contains the IPC permissions of the shared memory structure.
1188  *      @shmflg contains the operation control flags.
1189  *      Return 0 if permission is granted.
1190  * @shm_shmctl:
1191  *      Check permission when a shared memory control operation specified by
1192  *      @cmd is to be performed on the shared memory region with permissions @perm.
1193  *      The @perm may be NULL, e.g. for IPC_INFO or SHM_INFO.
1194  *      @perm contains the IPC permissions of the shared memory structure.
1195  *      @cmd contains the operation to be performed.
1196  *      Return 0 if permission is granted.
1197  * @shm_shmat:
1198  *      Check permissions prior to allowing the shmat system call to attach the
1199  *      shared memory segment with permissions @perm to the data segment of the
1200  *      calling process. The attaching address is specified by @shmaddr.
1201  *      @perm contains the IPC permissions of the shared memory structure.
1202  *      @shmaddr contains the address to attach memory region to.
1203  *      @shmflg contains the operational flags.
1204  *      Return 0 if permission is granted.
1205  *
1206  * Security hooks for System V Semaphores
1207  *
1208  * @sem_alloc_security:
1209  *      Allocate and attach a security structure to the @perm->security
1210  *      field. The security field is initialized to NULL when the structure is
1211  *      first created.
1212  *      @perm contains the IPC permissions of the semaphore.
1213  *      Return 0 if operation was successful and permission is granted.
1214  * @sem_free_security:
1215  *      Deallocate security structure @perm->security for the semaphore.
1216  *      @perm contains the IPC permissions of the semaphore.
1217  * @sem_associate:
1218  *      Check permission when a semaphore is requested through the semget
1219  *      system call. This hook is only called when returning the semaphore
1220  *      identifier for an existing semaphore, not when a new one must be
1221  *      created.
1222  *      @perm contains the IPC permissions of the semaphore.
1223  *      @semflg contains the operation control flags.
1224  *      Return 0 if permission is granted.
1225  * @sem_semctl:
1226  *      Check permission when a semaphore operation specified by @cmd is to be
1227  *      performed on the semaphore. The @perm may be NULL, e.g. for
1228  *      IPC_INFO or SEM_INFO.
1229  *      @perm contains the IPC permissions of the semaphore. May be NULL.
1230  *      @cmd contains the operation to be performed.
1231  *      Return 0 if permission is granted.
1232  * @sem_semop:
1233  *      Check permissions before performing operations on members of the
1234  *      semaphore set. If the @alter flag is nonzero, the semaphore set
1235  *      may be modified.
1236  *      @perm contains the IPC permissions of the semaphore.
1237  *      @sops contains the operations to perform.
1238  *      @nsops contains the number of operations to perform.
1239  *      @alter contains the flag indicating whether changes are to be made.
1240  *      Return 0 if permission is granted.
1241  *
1242  * @binder_set_context_mgr:
1243  *      Check whether @mgr is allowed to be the binder context manager.
1244  *      @mgr contains the task_struct for the task being registered.
1245  *      Return 0 if permission is granted.
1246  * @binder_transaction:
1247  *      Check whether @from is allowed to invoke a binder transaction call
1248  *      to @to.
1249  *      @from contains the task_struct for the sending task.
1250  *      @to contains the task_struct for the receiving task.
1251  * @binder_transfer_binder:
1252  *      Check whether @from is allowed to transfer a binder reference to @to.
1253  *      @from contains the task_struct for the sending task.
1254  *      @to contains the task_struct for the receiving task.
1255  * @binder_transfer_file:
1256  *      Check whether @from is allowed to transfer @file to @to.
1257  *      @from contains the task_struct for the sending task.
1258  *      @file contains the struct file being transferred.
1259  *      @to contains the task_struct for the receiving task.
1260  *
1261  * @ptrace_access_check:
1262  *      Check permission before allowing the current process to trace the
1263  *      @child process.
1264  *      Security modules may also want to perform a process tracing check
1265  *      during an execve in the set_security or apply_creds hooks of
1266  *      tracing check during an execve in the bprm_set_creds hook of
1267  *      binprm_security_ops if the process is being traced and its security
1268  *      attributes would be changed by the execve.
1269  *      @child contains the task_struct structure for the target process.
1270  *      @mode contains the PTRACE_MODE flags indicating the form of access.
1271  *      Return 0 if permission is granted.
1272  * @ptrace_traceme:
1273  *      Check that the @parent process has sufficient permission to trace the
1274  *      current process before allowing the current process to present itself
1275  *      to the @parent process for tracing.
1276  *      @parent contains the task_struct structure for debugger process.
1277  *      Return 0 if permission is granted.
1278  * @capget:
1279  *      Get the @effective, @inheritable, and @permitted capability sets for
1280  *      the @target process.  The hook may also perform permission checking to
1281  *      determine if the current process is allowed to see the capability sets
1282  *      of the @target process.
1283  *      @target contains the task_struct structure for target process.
1284  *      @effective contains the effective capability set.
1285  *      @inheritable contains the inheritable capability set.
1286  *      @permitted contains the permitted capability set.
1287  *      Return 0 if the capability sets were successfully obtained.
1288  * @capset:
1289  *      Set the @effective, @inheritable, and @permitted capability sets for
1290  *      the current process.
1291  *      @new contains the new credentials structure for target process.
1292  *      @old contains the current credentials structure for target process.
1293  *      @effective contains the effective capability set.
1294  *      @inheritable contains the inheritable capability set.
1295  *      @permitted contains the permitted capability set.
1296  *      Return 0 and update @new if permission is granted.
1297  * @capable:
1298  *      Check whether the @tsk process has the @cap capability in the indicated
1299  *      credentials.
1300  *      @cred contains the credentials to use.
1301  *      @ns contains the user namespace we want the capability in
1302  *      @cap contains the capability <include/linux/capability.h>.
1303  *      @opts contains options for the capable check <include/linux/security.h>
1304  *      Return 0 if the capability is granted for @tsk.
1305  * @syslog:
1306  *      Check permission before accessing the kernel message ring or changing
1307  *      logging to the console.
1308  *      See the syslog(2) manual page for an explanation of the @type values.
1309  *      @type contains the SYSLOG_ACTION_* constant from <include/linux/syslog.h>
1310  *      Return 0 if permission is granted.
1311  * @settime:
1312  *      Check permission to change the system time.
1313  *      struct timespec64 is defined in <include/linux/time64.h> and timezone
1314  *      is defined in <include/linux/time.h>
1315  *      @ts contains new time
1316  *      @tz contains new timezone
1317  *      Return 0 if permission is granted.
1318  * @vm_enough_memory:
1319  *      Check permissions for allocating a new virtual mapping.
1320  *      @mm contains the mm struct it is being added to.
1321  *      @pages contains the number of pages.
1322  *      Return 0 if permission is granted.
1323  *
1324  * @ismaclabel:
1325  *      Check if the extended attribute specified by @name
1326  *      represents a MAC label. Returns 1 if name is a MAC
1327  *      attribute otherwise returns 0.
1328  *      @name full extended attribute name to check against
1329  *      LSM as a MAC label.
1330  *
1331  * @secid_to_secctx:
1332  *      Convert secid to security context.  If secdata is NULL the length of
1333  *      the result will be returned in seclen, but no secdata will be returned.
1334  *      This does mean that the length could change between calls to check the
1335  *      length and the next call which actually allocates and returns the
1336  *      secdata.
1337  *      @secid contains the security ID.
1338  *      @secdata contains the pointer that stores the converted security
1339  *      context.
1340  *      @seclen pointer which contains the length of the data
1341  * @secctx_to_secid:
1342  *      Convert security context to secid.
1343  *      @secid contains the pointer to the generated security ID.
1344  *      @secdata contains the security context.
1345  *
1346  * @release_secctx:
1347  *      Release the security context.
1348  *      @secdata contains the security context.
1349  *      @seclen contains the length of the security context.
1350  *
1351  * Security hooks for Audit
1352  *
1353  * @audit_rule_init:
1354  *      Allocate and initialize an LSM audit rule structure.
1355  *      @field contains the required Audit action.
1356  *      Fields flags are defined in <include/linux/audit.h>
1357  *      @op contains the operator the rule uses.
1358  *      @rulestr contains the context where the rule will be applied to.
1359  *      @lsmrule contains a pointer to receive the result.
1360  *      Return 0 if @lsmrule has been successfully set,
1361  *      -EINVAL in case of an invalid rule.
1362  *
1363  * @audit_rule_known:
1364  *      Specifies whether given @krule contains any fields related to
1365  *      current LSM.
1366  *      @krule contains the audit rule of interest.
1367  *      Return 1 in case of relation found, 0 otherwise.
1368  *
1369  * @audit_rule_match:
1370  *      Determine if given @secid matches a rule previously approved
1371  *      by @audit_rule_known.
1372  *      @secid contains the security id in question.
1373  *      @field contains the field which relates to current LSM.
1374  *      @op contains the operator that will be used for matching.
1375  *      @lrule points to the audit rule that will be checked against.
1376  *      Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1377  *
1378  * @audit_rule_free:
1379  *      Deallocate the LSM audit rule structure previously allocated by
1380  *      audit_rule_init.
1381  *      @lsmrule contains the allocated rule
1382  *
1383  * @inode_invalidate_secctx:
1384  *      Notify the security module that it must revalidate the security context
1385  *      of an inode.
1386  *
1387  * @inode_notifysecctx:
1388  *      Notify the security module of what the security context of an inode
1389  *      should be.  Initializes the incore security context managed by the
1390  *      security module for this inode.  Example usage:  NFS client invokes
1391  *      this hook to initialize the security context in its incore inode to the
1392  *      value provided by the server for the file when the server returned the
1393  *      file's attributes to the client.
1394  *      Must be called with inode->i_mutex locked.
1395  *      @inode we wish to set the security context of.
1396  *      @ctx contains the string which we wish to set in the inode.
1397  *      @ctxlen contains the length of @ctx.
1398  *
1399  * @inode_setsecctx:
1400  *      Change the security context of an inode.  Updates the
1401  *      incore security context managed by the security module and invokes the
1402  *      fs code as needed (via __vfs_setxattr_noperm) to update any backing
1403  *      xattrs that represent the context.  Example usage:  NFS server invokes
1404  *      this hook to change the security context in its incore inode and on the
1405  *      backing filesystem to a value provided by the client on a SETATTR
1406  *      operation.
1407  *      Must be called with inode->i_mutex locked.
1408  *      @dentry contains the inode we wish to set the security context of.
1409  *      @ctx contains the string which we wish to set in the inode.
1410  *      @ctxlen contains the length of @ctx.
1411  *
1412  * @inode_getsecctx:
1413  *      On success, returns 0 and fills out @ctx and @ctxlen with the security
1414  *      context for the given @inode.
1415  *      @inode we wish to get the security context of.
1416  *      @ctx is a pointer in which to place the allocated security context.
1417  *      @ctxlen points to the place to put the length of @ctx.
1418  *
1419  * Security hooks for using the eBPF maps and programs functionalities through
1420  * eBPF syscalls.
1421  *
1422  * @bpf:
1423  *      Do a initial check for all bpf syscalls after the attribute is copied
1424  *      into the kernel. The actual security module can implement their own
1425  *      rules to check the specific cmd they need.
1426  *
1427  * @bpf_map:
1428  *      Do a check when the kernel generate and return a file descriptor for
1429  *      eBPF maps.
1430  *
1431  *      @map: bpf map that we want to access
1432  *      @mask: the access flags
1433  *
1434  * @bpf_prog:
1435  *      Do a check when the kernel generate and return a file descriptor for
1436  *      eBPF programs.
1437  *
1438  *      @prog: bpf prog that userspace want to use.
1439  *
1440  * @bpf_map_alloc_security:
1441  *      Initialize the security field inside bpf map.
1442  *
1443  * @bpf_map_free_security:
1444  *      Clean up the security information stored inside bpf map.
1445  *
1446  * @bpf_prog_alloc_security:
1447  *      Initialize the security field inside bpf program.
1448  *
1449  * @bpf_prog_free_security:
1450  *      Clean up the security information stored inside bpf prog.
1451  *
1452  * @locked_down
1453  *     Determine whether a kernel feature that potentially enables arbitrary
1454  *     code execution in kernel space should be permitted.
1455  *
1456  *     @what: kernel feature being accessed
1457  */
1458 union security_list_options {
1459         int (*binder_set_context_mgr)(struct task_struct *mgr);
1460         int (*binder_transaction)(struct task_struct *from,
1461                                         struct task_struct *to);
1462         int (*binder_transfer_binder)(struct task_struct *from,
1463                                         struct task_struct *to);
1464         int (*binder_transfer_file)(struct task_struct *from,
1465                                         struct task_struct *to,
1466                                         struct file *file);
1467 
1468         int (*ptrace_access_check)(struct task_struct *child,
1469                                         unsigned int mode);
1470         int (*ptrace_traceme)(struct task_struct *parent);
1471         int (*capget)(struct task_struct *target, kernel_cap_t *effective,
1472                         kernel_cap_t *inheritable, kernel_cap_t *permitted);
1473         int (*capset)(struct cred *new, const struct cred *old,
1474                         const kernel_cap_t *effective,
1475                         const kernel_cap_t *inheritable,
1476                         const kernel_cap_t *permitted);
1477         int (*capable)(const struct cred *cred,
1478                         struct user_namespace *ns,
1479                         int cap,
1480                         unsigned int opts);
1481         int (*quotactl)(int cmds, int type, int id, struct super_block *sb);
1482         int (*quota_on)(struct dentry *dentry);
1483         int (*syslog)(int type);
1484         int (*settime)(const struct timespec64 *ts, const struct timezone *tz);
1485         int (*vm_enough_memory)(struct mm_struct *mm, long pages);
1486 
1487         int (*bprm_set_creds)(struct linux_binprm *bprm);
1488         int (*bprm_check_security)(struct linux_binprm *bprm);
1489         void (*bprm_committing_creds)(struct linux_binprm *bprm);
1490         void (*bprm_committed_creds)(struct linux_binprm *bprm);
1491 
1492         int (*fs_context_dup)(struct fs_context *fc, struct fs_context *src_sc);
1493         int (*fs_context_parse_param)(struct fs_context *fc, struct fs_parameter *param);
1494 
1495         int (*sb_alloc_security)(struct super_block *sb);
1496         void (*sb_free_security)(struct super_block *sb);
1497         void (*sb_free_mnt_opts)(void *mnt_opts);
1498         int (*sb_eat_lsm_opts)(char *orig, void **mnt_opts);
1499         int (*sb_remount)(struct super_block *sb, void *mnt_opts);
1500         int (*sb_kern_mount)(struct super_block *sb);
1501         int (*sb_show_options)(struct seq_file *m, struct super_block *sb);
1502         int (*sb_statfs)(struct dentry *dentry);
1503         int (*sb_mount)(const char *dev_name, const struct path *path,
1504                         const char *type, unsigned long flags, void *data);
1505         int (*sb_umount)(struct vfsmount *mnt, int flags);
1506         int (*sb_pivotroot)(const struct path *old_path, const struct path *new_path);
1507         int (*sb_set_mnt_opts)(struct super_block *sb,
1508                                 void *mnt_opts,
1509                                 unsigned long kern_flags,
1510                                 unsigned long *set_kern_flags);
1511         int (*sb_clone_mnt_opts)(const struct super_block *oldsb,
1512                                         struct super_block *newsb,
1513                                         unsigned long kern_flags,
1514                                         unsigned long *set_kern_flags);
1515         int (*sb_add_mnt_opt)(const char *option, const char *val, int len,
1516                               void **mnt_opts);
1517         int (*move_mount)(const struct path *from_path, const struct path *to_path);
1518         int (*dentry_init_security)(struct dentry *dentry, int mode,
1519                                         const struct qstr *name, void **ctx,
1520                                         u32 *ctxlen);
1521         int (*dentry_create_files_as)(struct dentry *dentry, int mode,
1522                                         struct qstr *name,
1523                                         const struct cred *old,
1524                                         struct cred *new);
1525 
1526 
1527 #ifdef CONFIG_SECURITY_PATH
1528         int (*path_unlink)(const struct path *dir, struct dentry *dentry);
1529         int (*path_mkdir)(const struct path *dir, struct dentry *dentry,
1530                                 umode_t mode);
1531         int (*path_rmdir)(const struct path *dir, struct dentry *dentry);
1532         int (*path_mknod)(const struct path *dir, struct dentry *dentry,
1533                                 umode_t mode, unsigned int dev);
1534         int (*path_truncate)(const struct path *path);
1535         int (*path_symlink)(const struct path *dir, struct dentry *dentry,
1536                                 const char *old_name);
1537         int (*path_link)(struct dentry *old_dentry, const struct path *new_dir,
1538                                 struct dentry *new_dentry);
1539         int (*path_rename)(const struct path *old_dir, struct dentry *old_dentry,
1540                                 const struct path *new_dir,
1541                                 struct dentry *new_dentry);
1542         int (*path_chmod)(const struct path *path, umode_t mode);
1543         int (*path_chown)(const struct path *path, kuid_t uid, kgid_t gid);
1544         int (*path_chroot)(const struct path *path);
1545 #endif
1546         /* Needed for inode based security check */
1547         int (*path_notify)(const struct path *path, u64 mask,
1548                                 unsigned int obj_type);
1549         int (*inode_alloc_security)(struct inode *inode);
1550         void (*inode_free_security)(struct inode *inode);
1551         int (*inode_init_security)(struct inode *inode, struct inode *dir,
1552                                         const struct qstr *qstr,
1553                                         const char **name, void **value,
1554                                         size_t *len);
1555         int (*inode_create)(struct inode *dir, struct dentry *dentry,
1556                                 umode_t mode);
1557         int (*inode_link)(struct dentry *old_dentry, struct inode *dir,
1558                                 struct dentry *new_dentry);
1559         int (*inode_unlink)(struct inode *dir, struct dentry *dentry);
1560         int (*inode_symlink)(struct inode *dir, struct dentry *dentry,
1561                                 const char *old_name);
1562         int (*inode_mkdir)(struct inode *dir, struct dentry *dentry,
1563                                 umode_t mode);
1564         int (*inode_rmdir)(struct inode *dir, struct dentry *dentry);
1565         int (*inode_mknod)(struct inode *dir, struct dentry *dentry,
1566                                 umode_t mode, dev_t dev);
1567         int (*inode_rename)(struct inode *old_dir, struct dentry *old_dentry,
1568                                 struct inode *new_dir,
1569                                 struct dentry *new_dentry);
1570         int (*inode_readlink)(struct dentry *dentry);
1571         int (*inode_follow_link)(struct dentry *dentry, struct inode *inode,
1572                                  bool rcu);
1573         int (*inode_permission)(struct inode *inode, int mask);
1574         int (*inode_setattr)(struct dentry *dentry, struct iattr *attr);
1575         int (*inode_getattr)(const struct path *path);
1576         int (*inode_setxattr)(struct dentry *dentry, const char *name,
1577                                 const void *value, size_t size, int flags);
1578         void (*inode_post_setxattr)(struct dentry *dentry, const char *name,
1579                                         const void *value, size_t size,
1580                                         int flags);
1581         int (*inode_getxattr)(struct dentry *dentry, const char *name);
1582         int (*inode_listxattr)(struct dentry *dentry);
1583         int (*inode_removexattr)(struct dentry *dentry, const char *name);
1584         int (*inode_need_killpriv)(struct dentry *dentry);
1585         int (*inode_killpriv)(struct dentry *dentry);
1586         int (*inode_getsecurity)(struct inode *inode, const char *name,
1587                                         void **buffer, bool alloc);
1588         int (*inode_setsecurity)(struct inode *inode, const char *name,
1589                                         const void *value, size_t size,
1590                                         int flags);
1591         int (*inode_listsecurity)(struct inode *inode, char *buffer,
1592                                         size_t buffer_size);
1593         void (*inode_getsecid)(struct inode *inode, u32 *secid);
1594         int (*inode_copy_up)(struct dentry *src, struct cred **new);
1595         int (*inode_copy_up_xattr)(const char *name);
1596 
1597         int (*kernfs_init_security)(struct kernfs_node *kn_dir,
1598                                     struct kernfs_node *kn);
1599 
1600         int (*file_permission)(struct file *file, int mask);
1601         int (*file_alloc_security)(struct file *file);
1602         void (*file_free_security)(struct file *file);
1603         int (*file_ioctl)(struct file *file, unsigned int cmd,
1604                                 unsigned long arg);
1605         int (*mmap_addr)(unsigned long addr);
1606         int (*mmap_file)(struct file *file, unsigned long reqprot,
1607                                 unsigned long prot, unsigned long flags);
1608         int (*file_mprotect)(struct vm_area_struct *vma, unsigned long reqprot,
1609                                 unsigned long prot);
1610         int (*file_lock)(struct file *file, unsigned int cmd);
1611         int (*file_fcntl)(struct file *file, unsigned int cmd,
1612                                 unsigned long arg);
1613         void (*file_set_fowner)(struct file *file);
1614         int (*file_send_sigiotask)(struct task_struct *tsk,
1615                                         struct fown_struct *fown, int sig);
1616         int (*file_receive)(struct file *file);
1617         int (*file_open)(struct file *file);
1618 
1619         int (*task_alloc)(struct task_struct *task, unsigned long clone_flags);
1620         void (*task_free)(struct task_struct *task);
1621         int (*cred_alloc_blank)(struct cred *cred, gfp_t gfp);
1622         void (*cred_free)(struct cred *cred);
1623         int (*cred_prepare)(struct cred *new, const struct cred *old,
1624                                 gfp_t gfp);
1625         void (*cred_transfer)(struct cred *new, const struct cred *old);
1626         void (*cred_getsecid)(const struct cred *c, u32 *secid);
1627         int (*kernel_act_as)(struct cred *new, u32 secid);
1628         int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
1629         int (*kernel_module_request)(char *kmod_name);
1630         int (*kernel_load_data)(enum kernel_load_data_id id);
1631         int (*kernel_read_file)(struct file *file, enum kernel_read_file_id id);
1632         int (*kernel_post_read_file)(struct file *file, char *buf, loff_t size,
1633                                      enum kernel_read_file_id id);
1634         int (*task_fix_setuid)(struct cred *new, const struct cred *old,
1635                                 int flags);
1636         int (*task_setpgid)(struct task_struct *p, pid_t pgid);
1637         int (*task_getpgid)(struct task_struct *p);
1638         int (*task_getsid)(struct task_struct *p);
1639         void (*task_getsecid)(struct task_struct *p, u32 *secid);
1640         int (*task_setnice)(struct task_struct *p, int nice);
1641         int (*task_setioprio)(struct task_struct *p, int ioprio);
1642         int (*task_getioprio)(struct task_struct *p);
1643         int (*task_prlimit)(const struct cred *cred, const struct cred *tcred,
1644                             unsigned int flags);
1645         int (*task_setrlimit)(struct task_struct *p, unsigned int resource,
1646                                 struct rlimit *new_rlim);
1647         int (*task_setscheduler)(struct task_struct *p);
1648         int (*task_getscheduler)(struct task_struct *p);
1649         int (*task_movememory)(struct task_struct *p);
1650         int (*task_kill)(struct task_struct *p, struct kernel_siginfo *info,
1651                                 int sig, const struct cred *cred);
1652         int (*task_prctl)(int option, unsigned long arg2, unsigned long arg3,
1653                                 unsigned long arg4, unsigned long arg5);
1654         void (*task_to_inode)(struct task_struct *p, struct inode *inode);
1655 
1656         int (*ipc_permission)(struct kern_ipc_perm *ipcp, short flag);
1657         void (*ipc_getsecid)(struct kern_ipc_perm *ipcp, u32 *secid);
1658 
1659         int (*msg_msg_alloc_security)(struct msg_msg *msg);
1660         void (*msg_msg_free_security)(struct msg_msg *msg);
1661 
1662         int (*msg_queue_alloc_security)(struct kern_ipc_perm *perm);
1663         void (*msg_queue_free_security)(struct kern_ipc_perm *perm);
1664         int (*msg_queue_associate)(struct kern_ipc_perm *perm, int msqflg);
1665         int (*msg_queue_msgctl)(struct kern_ipc_perm *perm, int cmd);
1666         int (*msg_queue_msgsnd)(struct kern_ipc_perm *perm, struct msg_msg *msg,
1667                                 int msqflg);
1668         int (*msg_queue_msgrcv)(struct kern_ipc_perm *perm, struct msg_msg *msg,
1669                                 struct task_struct *target, long type,
1670                                 int mode);
1671 
1672         int (*shm_alloc_security)(struct kern_ipc_perm *perm);
1673         void (*shm_free_security)(struct kern_ipc_perm *perm);
1674         int (*shm_associate)(struct kern_ipc_perm *perm, int shmflg);
1675         int (*shm_shmctl)(struct kern_ipc_perm *perm, int cmd);
1676         int (*shm_shmat)(struct kern_ipc_perm *perm, char __user *shmaddr,
1677                                 int shmflg);
1678 
1679         int (*sem_alloc_security)(struct kern_ipc_perm *perm);
1680         void (*sem_free_security)(struct kern_ipc_perm *perm);
1681         int (*sem_associate)(struct kern_ipc_perm *perm, int semflg);
1682         int (*sem_semctl)(struct kern_ipc_perm *perm, int cmd);
1683         int (*sem_semop)(struct kern_ipc_perm *perm, struct sembuf *sops,
1684                                 unsigned nsops, int alter);
1685 
1686         int (*netlink_send)(struct sock *sk, struct sk_buff *skb);
1687 
1688         void (*d_instantiate)(struct dentry *dentry, struct inode *inode);
1689 
1690         int (*getprocattr)(struct task_struct *p, char *name, char **value);
1691         int (*setprocattr)(const char *name, void *value, size_t size);
1692         int (*ismaclabel)(const char *name);
1693         int (*secid_to_secctx)(u32 secid, char **secdata, u32 *seclen);
1694         int (*secctx_to_secid)(const char *secdata, u32 seclen, u32 *secid);
1695         void (*release_secctx)(char *secdata, u32 seclen);
1696 
1697         void (*inode_invalidate_secctx)(struct inode *inode);
1698         int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen);
1699         int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
1700         int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen);
1701 
1702 #ifdef CONFIG_SECURITY_NETWORK
1703         int (*unix_stream_connect)(struct sock *sock, struct sock *other,
1704                                         struct sock *newsk);
1705         int (*unix_may_send)(struct socket *sock, struct socket *other);
1706 
1707         int (*socket_create)(int family, int type, int protocol, int kern);
1708         int (*socket_post_create)(struct socket *sock, int family, int type,
1709                                         int protocol, int kern);
1710         int (*socket_socketpair)(struct socket *socka, struct socket *sockb);
1711         int (*socket_bind)(struct socket *sock, struct sockaddr *address,
1712                                 int addrlen);
1713         int (*socket_connect)(struct socket *sock, struct sockaddr *address,
1714                                 int addrlen);
1715         int (*socket_listen)(struct socket *sock, int backlog);
1716         int (*socket_accept)(struct socket *sock, struct socket *newsock);
1717         int (*socket_sendmsg)(struct socket *sock, struct msghdr *msg,
1718                                 int size);
1719         int (*socket_recvmsg)(struct socket *sock, struct msghdr *msg,
1720                                 int size, int flags);
1721         int (*socket_getsockname)(struct socket *sock);
1722         int (*socket_getpeername)(struct socket *sock);
1723         int (*socket_getsockopt)(struct socket *sock, int level, int optname);
1724         int (*socket_setsockopt)(struct socket *sock, int level, int optname);
1725         int (*socket_shutdown)(struct socket *sock, int how);
1726         int (*socket_sock_rcv_skb)(struct sock *sk, struct sk_buff *skb);
1727         int (*socket_getpeersec_stream)(struct socket *sock,
1728                                         char __user *optval,
1729                                         int __user *optlen, unsigned len);
1730         int (*socket_getpeersec_dgram)(struct socket *sock,
1731                                         struct sk_buff *skb, u32 *secid);
1732         int (*sk_alloc_security)(struct sock *sk, int family, gfp_t priority);
1733         void (*sk_free_security)(struct sock *sk);
1734         void (*sk_clone_security)(const struct sock *sk, struct sock *newsk);
1735         void (*sk_getsecid)(struct sock *sk, u32 *secid);
1736         void (*sock_graft)(struct sock *sk, struct socket *parent);
1737         int (*inet_conn_request)(struct sock *sk, struct sk_buff *skb,
1738                                         struct request_sock *req);
1739         void (*inet_csk_clone)(struct sock *newsk,
1740                                 const struct request_sock *req);
1741         void (*inet_conn_established)(struct sock *sk, struct sk_buff *skb);
1742         int (*secmark_relabel_packet)(u32 secid);
1743         void (*secmark_refcount_inc)(void);
1744         void (*secmark_refcount_dec)(void);
1745         void (*req_classify_flow)(const struct request_sock *req,
1746                                         struct flowi *fl);
1747         int (*tun_dev_alloc_security)(void **security);
1748         void (*tun_dev_free_security)(void *security);
1749         int (*tun_dev_create)(void);
1750         int (*tun_dev_attach_queue)(void *security);
1751         int (*tun_dev_attach)(struct sock *sk, void *security);
1752         int (*tun_dev_open)(void *security);
1753         int (*sctp_assoc_request)(struct sctp_endpoint *ep,
1754                                   struct sk_buff *skb);
1755         int (*sctp_bind_connect)(struct sock *sk, int optname,
1756                                  struct sockaddr *address, int addrlen);
1757         void (*sctp_sk_clone)(struct sctp_endpoint *ep, struct sock *sk,
1758                               struct sock *newsk);
1759 #endif  /* CONFIG_SECURITY_NETWORK */
1760 
1761 #ifdef CONFIG_SECURITY_INFINIBAND
1762         int (*ib_pkey_access)(void *sec, u64 subnet_prefix, u16 pkey);
1763         int (*ib_endport_manage_subnet)(void *sec, const char *dev_name,
1764                                         u8 port_num);
1765         int (*ib_alloc_security)(void **sec);
1766         void (*ib_free_security)(void *sec);
1767 #endif  /* CONFIG_SECURITY_INFINIBAND */
1768 
1769 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1770         int (*xfrm_policy_alloc_security)(struct xfrm_sec_ctx **ctxp,
1771                                           struct xfrm_user_sec_ctx *sec_ctx,
1772                                                 gfp_t gfp);
1773         int (*xfrm_policy_clone_security)(struct xfrm_sec_ctx *old_ctx,
1774                                                 struct xfrm_sec_ctx **new_ctx);
1775         void (*xfrm_policy_free_security)(struct xfrm_sec_ctx *ctx);
1776         int (*xfrm_policy_delete_security)(struct xfrm_sec_ctx *ctx);
1777         int (*xfrm_state_alloc)(struct xfrm_state *x,
1778                                 struct xfrm_user_sec_ctx *sec_ctx);
1779         int (*xfrm_state_alloc_acquire)(struct xfrm_state *x,
1780                                         struct xfrm_sec_ctx *polsec,
1781                                         u32 secid);
1782         void (*xfrm_state_free_security)(struct xfrm_state *x);
1783         int (*xfrm_state_delete_security)(struct xfrm_state *x);
1784         int (*xfrm_policy_lookup)(struct xfrm_sec_ctx *ctx, u32 fl_secid,
1785                                         u8 dir);
1786         int (*xfrm_state_pol_flow_match)(struct xfrm_state *x,
1787                                                 struct xfrm_policy *xp,
1788                                                 const struct flowi *fl);
1789         int (*xfrm_decode_session)(struct sk_buff *skb, u32 *secid, int ckall);
1790 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1791 
1792         /* key management security hooks */
1793 #ifdef CONFIG_KEYS
1794         int (*key_alloc)(struct key *key, const struct cred *cred,
1795                                 unsigned long flags);
1796         void (*key_free)(struct key *key);
1797         int (*key_permission)(key_ref_t key_ref, const struct cred *cred,
1798                                 unsigned perm);
1799         int (*key_getsecurity)(struct key *key, char **_buffer);
1800 #endif  /* CONFIG_KEYS */
1801 
1802 #ifdef CONFIG_AUDIT
1803         int (*audit_rule_init)(u32 field, u32 op, char *rulestr,
1804                                 void **lsmrule);
1805         int (*audit_rule_known)(struct audit_krule *krule);
1806         int (*audit_rule_match)(u32 secid, u32 field, u32 op, void *lsmrule);
1807         void (*audit_rule_free)(void *lsmrule);
1808 #endif /* CONFIG_AUDIT */
1809 
1810 #ifdef CONFIG_BPF_SYSCALL
1811         int (*bpf)(int cmd, union bpf_attr *attr,
1812                                  unsigned int size);
1813         int (*bpf_map)(struct bpf_map *map, fmode_t fmode);
1814         int (*bpf_prog)(struct bpf_prog *prog);
1815         int (*bpf_map_alloc_security)(struct bpf_map *map);
1816         void (*bpf_map_free_security)(struct bpf_map *map);
1817         int (*bpf_prog_alloc_security)(struct bpf_prog_aux *aux);
1818         void (*bpf_prog_free_security)(struct bpf_prog_aux *aux);
1819 #endif /* CONFIG_BPF_SYSCALL */
1820         int (*locked_down)(enum lockdown_reason what);
1821 #ifdef CONFIG_PERF_EVENTS
1822         int (*perf_event_open)(struct perf_event_attr *attr, int type);
1823         int (*perf_event_alloc)(struct perf_event *event);
1824         void (*perf_event_free)(struct perf_event *event);
1825         int (*perf_event_read)(struct perf_event *event);
1826         int (*perf_event_write)(struct perf_event *event);
1827 
1828 #endif
1829 };
1830 
1831 struct security_hook_heads {
1832         struct hlist_head binder_set_context_mgr;
1833         struct hlist_head binder_transaction;
1834         struct hlist_head binder_transfer_binder;
1835         struct hlist_head binder_transfer_file;
1836         struct hlist_head ptrace_access_check;
1837         struct hlist_head ptrace_traceme;
1838         struct hlist_head capget;
1839         struct hlist_head capset;
1840         struct hlist_head capable;
1841         struct hlist_head quotactl;
1842         struct hlist_head quota_on;
1843         struct hlist_head syslog;
1844         struct hlist_head settime;
1845         struct hlist_head vm_enough_memory;
1846         struct hlist_head bprm_set_creds;
1847         struct hlist_head bprm_check_security;
1848         struct hlist_head bprm_committing_creds;
1849         struct hlist_head bprm_committed_creds;
1850         struct hlist_head fs_context_dup;
1851         struct hlist_head fs_context_parse_param;
1852         struct hlist_head sb_alloc_security;
1853         struct hlist_head sb_free_security;
1854         struct hlist_head sb_free_mnt_opts;
1855         struct hlist_head sb_eat_lsm_opts;
1856         struct hlist_head sb_remount;
1857         struct hlist_head sb_kern_mount;
1858         struct hlist_head sb_show_options;
1859         struct hlist_head sb_statfs;
1860         struct hlist_head sb_mount;
1861         struct hlist_head sb_umount;
1862         struct hlist_head sb_pivotroot;
1863         struct hlist_head sb_set_mnt_opts;
1864         struct hlist_head sb_clone_mnt_opts;
1865         struct hlist_head sb_add_mnt_opt;
1866         struct hlist_head move_mount;
1867         struct hlist_head dentry_init_security;
1868         struct hlist_head dentry_create_files_as;
1869 #ifdef CONFIG_SECURITY_PATH
1870         struct hlist_head path_unlink;
1871         struct hlist_head path_mkdir;
1872         struct hlist_head path_rmdir;
1873         struct hlist_head path_mknod;
1874         struct hlist_head path_truncate;
1875         struct hlist_head path_symlink;
1876         struct hlist_head path_link;
1877         struct hlist_head path_rename;
1878         struct hlist_head path_chmod;
1879         struct hlist_head path_chown;
1880         struct hlist_head path_chroot;
1881 #endif
1882         /* Needed for inode based modules as well */
1883         struct hlist_head path_notify;
1884         struct hlist_head inode_alloc_security;
1885         struct hlist_head inode_free_security;
1886         struct hlist_head inode_init_security;
1887         struct hlist_head inode_create;
1888         struct hlist_head inode_link;
1889         struct hlist_head inode_unlink;
1890         struct hlist_head inode_symlink;
1891         struct hlist_head inode_mkdir;
1892         struct hlist_head inode_rmdir;
1893         struct hlist_head inode_mknod;
1894         struct hlist_head inode_rename;
1895         struct hlist_head inode_readlink;
1896         struct hlist_head inode_follow_link;
1897         struct hlist_head inode_permission;
1898         struct hlist_head inode_setattr;
1899         struct hlist_head inode_getattr;
1900         struct hlist_head inode_setxattr;
1901         struct hlist_head inode_post_setxattr;
1902         struct hlist_head inode_getxattr;
1903         struct hlist_head inode_listxattr;
1904         struct hlist_head inode_removexattr;
1905         struct hlist_head inode_need_killpriv;
1906         struct hlist_head inode_killpriv;
1907         struct hlist_head inode_getsecurity;
1908         struct hlist_head inode_setsecurity;
1909         struct hlist_head inode_listsecurity;
1910         struct hlist_head inode_getsecid;
1911         struct hlist_head inode_copy_up;
1912         struct hlist_head inode_copy_up_xattr;
1913         struct hlist_head kernfs_init_security;
1914         struct hlist_head file_permission;
1915         struct hlist_head file_alloc_security;
1916         struct hlist_head file_free_security;
1917         struct hlist_head file_ioctl;
1918         struct hlist_head mmap_addr;
1919         struct hlist_head mmap_file;
1920         struct hlist_head file_mprotect;
1921         struct hlist_head file_lock;
1922         struct hlist_head file_fcntl;
1923         struct hlist_head file_set_fowner;
1924         struct hlist_head file_send_sigiotask;
1925         struct hlist_head file_receive;
1926         struct hlist_head file_open;
1927         struct hlist_head task_alloc;
1928         struct hlist_head task_free;
1929         struct hlist_head cred_alloc_blank;
1930         struct hlist_head cred_free;
1931         struct hlist_head cred_prepare;
1932         struct hlist_head cred_transfer;
1933         struct hlist_head cred_getsecid;
1934         struct hlist_head kernel_act_as;
1935         struct hlist_head kernel_create_files_as;
1936         struct hlist_head kernel_load_data;
1937         struct hlist_head kernel_read_file;
1938         struct hlist_head kernel_post_read_file;
1939         struct hlist_head kernel_module_request;
1940         struct hlist_head task_fix_setuid;
1941         struct hlist_head task_setpgid;
1942         struct hlist_head task_getpgid;
1943         struct hlist_head task_getsid;
1944         struct hlist_head task_getsecid;
1945         struct hlist_head task_setnice;
1946         struct hlist_head task_setioprio;
1947         struct hlist_head task_getioprio;
1948         struct hlist_head task_prlimit;
1949         struct hlist_head task_setrlimit;
1950         struct hlist_head task_setscheduler;
1951         struct hlist_head task_getscheduler;
1952         struct hlist_head task_movememory;
1953         struct hlist_head task_kill;
1954         struct hlist_head task_prctl;
1955         struct hlist_head task_to_inode;
1956         struct hlist_head ipc_permission;
1957         struct hlist_head ipc_getsecid;
1958         struct hlist_head msg_msg_alloc_security;
1959         struct hlist_head msg_msg_free_security;
1960         struct hlist_head msg_queue_alloc_security;
1961         struct hlist_head msg_queue_free_security;
1962         struct hlist_head msg_queue_associate;
1963         struct hlist_head msg_queue_msgctl;
1964         struct hlist_head msg_queue_msgsnd;
1965         struct hlist_head msg_queue_msgrcv;
1966         struct hlist_head shm_alloc_security;
1967         struct hlist_head shm_free_security;
1968         struct hlist_head shm_associate;
1969         struct hlist_head shm_shmctl;
1970         struct hlist_head shm_shmat;
1971         struct hlist_head sem_alloc_security;
1972         struct hlist_head sem_free_security;
1973         struct hlist_head sem_associate;
1974         struct hlist_head sem_semctl;
1975         struct hlist_head sem_semop;
1976         struct hlist_head netlink_send;
1977         struct hlist_head d_instantiate;
1978         struct hlist_head getprocattr;
1979         struct hlist_head setprocattr;
1980         struct hlist_head ismaclabel;
1981         struct hlist_head secid_to_secctx;
1982         struct hlist_head secctx_to_secid;
1983         struct hlist_head release_secctx;
1984         struct hlist_head inode_invalidate_secctx;
1985         struct hlist_head inode_notifysecctx;
1986         struct hlist_head inode_setsecctx;
1987         struct hlist_head inode_getsecctx;
1988 #ifdef CONFIG_SECURITY_NETWORK
1989         struct hlist_head unix_stream_connect;
1990         struct hlist_head unix_may_send;
1991         struct hlist_head socket_create;
1992         struct hlist_head socket_post_create;
1993         struct hlist_head socket_socketpair;
1994         struct hlist_head socket_bind;
1995         struct hlist_head socket_connect;
1996         struct hlist_head socket_listen;
1997         struct hlist_head socket_accept;
1998         struct hlist_head socket_sendmsg;
1999         struct hlist_head socket_recvmsg;
2000         struct hlist_head socket_getsockname;
2001         struct hlist_head socket_getpeername;
2002         struct hlist_head socket_getsockopt;
2003         struct hlist_head socket_setsockopt;
2004         struct hlist_head socket_shutdown;
2005         struct hlist_head socket_sock_rcv_skb;
2006         struct hlist_head socket_getpeersec_stream;
2007         struct hlist_head socket_getpeersec_dgram;
2008         struct hlist_head sk_alloc_security;
2009         struct hlist_head sk_free_security;
2010         struct hlist_head sk_clone_security;
2011         struct hlist_head sk_getsecid;
2012         struct hlist_head sock_graft;
2013         struct hlist_head inet_conn_request;
2014         struct hlist_head inet_csk_clone;
2015         struct hlist_head inet_conn_established;
2016         struct hlist_head secmark_relabel_packet;
2017         struct hlist_head secmark_refcount_inc;
2018         struct hlist_head secmark_refcount_dec;
2019         struct hlist_head req_classify_flow;
2020         struct hlist_head tun_dev_alloc_security;
2021         struct hlist_head tun_dev_free_security;
2022         struct hlist_head tun_dev_create;
2023         struct hlist_head tun_dev_attach_queue;
2024         struct hlist_head tun_dev_attach;
2025         struct hlist_head tun_dev_open;
2026         struct hlist_head sctp_assoc_request;
2027         struct hlist_head sctp_bind_connect;
2028         struct hlist_head sctp_sk_clone;
2029 #endif  /* CONFIG_SECURITY_NETWORK */
2030 #ifdef CONFIG_SECURITY_INFINIBAND
2031         struct hlist_head ib_pkey_access;
2032         struct hlist_head ib_endport_manage_subnet;
2033         struct hlist_head ib_alloc_security;
2034         struct hlist_head ib_free_security;
2035 #endif  /* CONFIG_SECURITY_INFINIBAND */
2036 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2037         struct hlist_head xfrm_policy_alloc_security;
2038         struct hlist_head xfrm_policy_clone_security;
2039         struct hlist_head xfrm_policy_free_security;
2040         struct hlist_head xfrm_policy_delete_security;
2041         struct hlist_head xfrm_state_alloc;
2042         struct hlist_head xfrm_state_alloc_acquire;
2043         struct hlist_head xfrm_state_free_security;
2044         struct hlist_head xfrm_state_delete_security;
2045         struct hlist_head xfrm_policy_lookup;
2046         struct hlist_head xfrm_state_pol_flow_match;
2047         struct hlist_head xfrm_decode_session;
2048 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
2049 #ifdef CONFIG_KEYS
2050         struct hlist_head key_alloc;
2051         struct hlist_head key_free;
2052         struct hlist_head key_permission;
2053         struct hlist_head key_getsecurity;
2054 #endif  /* CONFIG_KEYS */
2055 #ifdef CONFIG_AUDIT
2056         struct hlist_head audit_rule_init;
2057         struct hlist_head audit_rule_known;
2058         struct hlist_head audit_rule_match;
2059         struct hlist_head audit_rule_free;
2060 #endif /* CONFIG_AUDIT */
2061 #ifdef CONFIG_BPF_SYSCALL
2062         struct hlist_head bpf;
2063         struct hlist_head bpf_map;
2064         struct hlist_head bpf_prog;
2065         struct hlist_head bpf_map_alloc_security;
2066         struct hlist_head bpf_map_free_security;
2067         struct hlist_head bpf_prog_alloc_security;
2068         struct hlist_head bpf_prog_free_security;
2069 #endif /* CONFIG_BPF_SYSCALL */
2070         struct hlist_head locked_down;
2071 #ifdef CONFIG_PERF_EVENTS
2072         struct hlist_head perf_event_open;
2073         struct hlist_head perf_event_alloc;
2074         struct hlist_head perf_event_free;
2075         struct hlist_head perf_event_read;
2076         struct hlist_head perf_event_write;
2077 #endif
2078 } __randomize_layout;
2079 
2080 /*
2081  * Security module hook list structure.
2082  * For use with generic list macros for common operations.
2083  */
2084 struct security_hook_list {
2085         struct hlist_node               list;
2086         struct hlist_head               *head;
2087         union security_list_options     hook;
2088         char                            *lsm;
2089 } __randomize_layout;
2090 
2091 /*
2092  * Security blob size or offset data.
2093  */
2094 struct lsm_blob_sizes {
2095         int     lbs_cred;
2096         int     lbs_file;
2097         int     lbs_inode;
2098         int     lbs_ipc;
2099         int     lbs_msg_msg;
2100         int     lbs_task;
2101 };
2102 
2103 /*
2104  * Initializing a security_hook_list structure takes
2105  * up a lot of space in a source file. This macro takes
2106  * care of the common case and reduces the amount of
2107  * text involved.
2108  */
2109 #define LSM_HOOK_INIT(HEAD, HOOK) \
2110         { .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
2111 
2112 extern struct security_hook_heads security_hook_heads;
2113 extern char *lsm_names;
2114 
2115 extern void security_add_hooks(struct security_hook_list *hooks, int count,
2116                                 char *lsm);
2117 
2118 #define LSM_FLAG_LEGACY_MAJOR   BIT(0)
2119 #define LSM_FLAG_EXCLUSIVE      BIT(1)
2120 
2121 enum lsm_order {
2122         LSM_ORDER_FIRST = -1,   /* This is only for capabilities. */
2123         LSM_ORDER_MUTABLE = 0,
2124 };
2125 
2126 struct lsm_info {
2127         const char *name;       /* Required. */
2128         enum lsm_order order;   /* Optional: default is LSM_ORDER_MUTABLE */
2129         unsigned long flags;    /* Optional: flags describing LSM */
2130         int *enabled;           /* Optional: controlled by CONFIG_LSM */
2131         int (*init)(void);      /* Required. */
2132         struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */
2133 };
2134 
2135 extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
2136 extern struct lsm_info __start_early_lsm_info[], __end_early_lsm_info[];
2137 
2138 #define DEFINE_LSM(lsm)                                                 \
2139         static struct lsm_info __lsm_##lsm                              \
2140                 __used __section(.lsm_info.init)                        \
2141                 __aligned(sizeof(unsigned long))
2142 
2143 #define DEFINE_EARLY_LSM(lsm)                                           \
2144         static struct lsm_info __early_lsm_##lsm                        \
2145                 __used __section(.early_lsm_info.init)                  \
2146                 __aligned(sizeof(unsigned long))
2147 
2148 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2149 /*
2150  * Assuring the safety of deleting a security module is up to
2151  * the security module involved. This may entail ordering the
2152  * module's hook list in a particular way, refusing to disable
2153  * the module once a policy is loaded or any number of other
2154  * actions better imagined than described.
2155  *
2156  * The name of the configuration option reflects the only module
2157  * that currently uses the mechanism. Any developer who thinks
2158  * disabling their module is a good idea needs to be at least as
2159  * careful as the SELinux team.
2160  */
2161 static inline void security_delete_hooks(struct security_hook_list *hooks,
2162                                                 int count)
2163 {
2164         int i;
2165 
2166         for (i = 0; i < count; i++)
2167                 hlist_del_rcu(&hooks[i].list);
2168 }
2169 #endif /* CONFIG_SECURITY_SELINUX_DISABLE */
2170 
2171 /* Currently required to handle SELinux runtime hook disable. */
2172 #ifdef CONFIG_SECURITY_WRITABLE_HOOKS
2173 #define __lsm_ro_after_init
2174 #else
2175 #define __lsm_ro_after_init     __ro_after_init
2176 #endif /* CONFIG_SECURITY_WRITABLE_HOOKS */
2177 
2178 extern int lsm_inode_alloc(struct inode *inode);
2179 
2180 #endif /* ! __LINUX_LSM_HOOKS_H */
2181 

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