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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  *
 12  *      This program is free software; you can redistribute it and/or modify
 13  *      it under the terms of the GNU General Public License as published by
 14  *      the Free Software Foundation; either version 2 of the License, or
 15  *      (at your option) any later version.
 16  *
 17  *      Due to this file being licensed under the GPL there is controversy over
 18  *      whether this permits you to write a module that #includes this file
 19  *      without placing your module under the GPL.  Please consult a lawyer for
 20  *      advice before doing this.
 21  *
 22  */
 23 
 24 #ifndef __LINUX_LSM_HOOKS_H
 25 #define __LINUX_LSM_HOOKS_H
 26 
 27 #include <linux/security.h>
 28 #include <linux/init.h>
 29 #include <linux/rculist.h>
 30 
 31 /**
 32  * Security hooks for program execution operations.
 33  *
 34  * @bprm_set_creds:
 35  *      Save security information in the bprm->security field, typically based
 36  *      on information about the bprm->file, for later use by the apply_creds
 37  *      hook.  This hook may also optionally check permissions (e.g. for
 38  *      transitions between security domains).
 39  *      This hook may be called multiple times during a single execve, e.g. for
 40  *      interpreters.  The hook can tell whether it has already been called by
 41  *      checking to see if @bprm->security is non-NULL.  If so, then the hook
 42  *      may decide either to retain the security information saved earlier or
 43  *      to replace it.
 44  *      @bprm contains the linux_binprm structure.
 45  *      Return 0 if the hook is successful and permission is granted.
 46  * @bprm_check_security:
 47  *      This hook mediates the point when a search for a binary handler will
 48  *      begin.  It allows a check the @bprm->security value which is set in the
 49  *      preceding set_creds call.  The primary difference from set_creds is
 50  *      that the argv list and envp list are reliably available in @bprm.  This
 51  *      hook may be called multiple times during a single execve; and in each
 52  *      pass set_creds is called first.
 53  *      @bprm contains the linux_binprm structure.
 54  *      Return 0 if the hook is successful and permission is granted.
 55  * @bprm_committing_creds:
 56  *      Prepare to install the new security attributes of a process being
 57  *      transformed by an execve operation, based on the old credentials
 58  *      pointed to by @current->cred and the information set in @bprm->cred by
 59  *      the bprm_set_creds hook.  @bprm points to the linux_binprm structure.
 60  *      This hook is a good place to perform state changes on the process such
 61  *      as closing open file descriptors to which access will no longer be
 62  *      granted when the attributes are changed.  This is called immediately
 63  *      before commit_creds().
 64  * @bprm_committed_creds:
 65  *      Tidy up after the installation of the new security attributes of a
 66  *      process being transformed by an execve operation.  The new credentials
 67  *      have, by this point, been set to @current->cred.  @bprm points to the
 68  *      linux_binprm structure.  This hook is a good place to perform state
 69  *      changes on the process such as clearing out non-inheritable signal
 70  *      state.  This is called immediately after commit_creds().
 71  * @bprm_secureexec:
 72  *      Return a boolean value (0 or 1) indicating whether a "secure exec"
 73  *      is required.  The flag is passed in the auxiliary table
 74  *      on the initial stack to the ELF interpreter to indicate whether libc
 75  *      should enable secure mode.
 76  *      @bprm contains the linux_binprm structure.
 77  *
 78  * Security hooks for filesystem operations.
 79  *
 80  * @sb_alloc_security:
 81  *      Allocate and attach a security structure to the sb->s_security field.
 82  *      The s_security field is initialized to NULL when the structure is
 83  *      allocated.
 84  *      @sb contains the super_block structure to be modified.
 85  *      Return 0 if operation was successful.
 86  * @sb_free_security:
 87  *      Deallocate and clear the sb->s_security field.
 88  *      @sb contains the super_block structure to be modified.
 89  * @sb_statfs:
 90  *      Check permission before obtaining filesystem statistics for the @mnt
 91  *      mountpoint.
 92  *      @dentry is a handle on the superblock for the filesystem.
 93  *      Return 0 if permission is granted.
 94  * @sb_mount:
 95  *      Check permission before an object specified by @dev_name is mounted on
 96  *      the mount point named by @nd.  For an ordinary mount, @dev_name
 97  *      identifies a device if the file system type requires a device.  For a
 98  *      remount (@flags & MS_REMOUNT), @dev_name is irrelevant.  For a
 99  *      loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
100  *      pathname of the object being mounted.
101  *      @dev_name contains the name for object being mounted.
102  *      @path contains the path for mount point object.
103  *      @type contains the filesystem type.
104  *      @flags contains the mount flags.
105  *      @data contains the filesystem-specific data.
106  *      Return 0 if permission is granted.
107  * @sb_copy_data:
108  *      Allow mount option data to be copied prior to parsing by the filesystem,
109  *      so that the security module can extract security-specific mount
110  *      options cleanly (a filesystem may modify the data e.g. with strsep()).
111  *      This also allows the original mount data to be stripped of security-
112  *      specific options to avoid having to make filesystems aware of them.
113  *      @type the type of filesystem being mounted.
114  *      @orig the original mount data copied from userspace.
115  *      @copy copied data which will be passed to the security module.
116  *      Returns 0 if the copy was successful.
117  * @sb_remount:
118  *      Extracts security system specific mount options and verifies no changes
119  *      are being made to those options.
120  *      @sb superblock being remounted
121  *      @data contains the filesystem-specific data.
122  *      Return 0 if permission is granted.
123  * @sb_umount:
124  *      Check permission before the @mnt file system is unmounted.
125  *      @mnt contains the mounted file system.
126  *      @flags contains the unmount flags, e.g. MNT_FORCE.
127  *      Return 0 if permission is granted.
128  * @sb_pivotroot:
129  *      Check permission before pivoting the root filesystem.
130  *      @old_path contains the path for the new location of the
131  *      current root (put_old).
132  *      @new_path contains the path for the new root (new_root).
133  *      Return 0 if permission is granted.
134  * @sb_set_mnt_opts:
135  *      Set the security relevant mount options used for a superblock
136  *      @sb the superblock to set security mount options for
137  *      @opts binary data structure containing all lsm mount data
138  * @sb_clone_mnt_opts:
139  *      Copy all security options from a given superblock to another
140  *      @oldsb old superblock which contain information to clone
141  *      @newsb new superblock which needs filled in
142  * @sb_parse_opts_str:
143  *      Parse a string of security data filling in the opts structure
144  *      @options string containing all mount options known by the LSM
145  *      @opts binary data structure usable by the LSM
146  * @dentry_init_security:
147  *      Compute a context for a dentry as the inode is not yet available
148  *      since NFSv4 has no label backed by an EA anyway.
149  *      @dentry dentry to use in calculating the context.
150  *      @mode mode used to determine resource type.
151  *      @name name of the last path component used to create file
152  *      @ctx pointer to place the pointer to the resulting context in.
153  *      @ctxlen point to place the length of the resulting context.
154  * @dentry_create_files_as:
155  *      Compute a context for a dentry as the inode is not yet available
156  *      and set that context in passed in creds so that new files are
157  *      created using that context. Context is calculated using the
158  *      passed in creds and not the creds of the caller.
159  *      @dentry dentry to use in calculating the context.
160  *      @mode mode used to determine resource type.
161  *      @name name of the last path component used to create file
162  *      @old creds which should be used for context calculation
163  *      @new creds to modify
164  *
165  *
166  * Security hooks for inode operations.
167  *
168  * @inode_alloc_security:
169  *      Allocate and attach a security structure to @inode->i_security.  The
170  *      i_security field is initialized to NULL when the inode structure is
171  *      allocated.
172  *      @inode contains the inode structure.
173  *      Return 0 if operation was successful.
174  * @inode_free_security:
175  *      @inode contains the inode structure.
176  *      Deallocate the inode security structure and set @inode->i_security to
177  *      NULL.
178  * @inode_init_security:
179  *      Obtain the security attribute name suffix and value to set on a newly
180  *      created inode and set up the incore security field for the new inode.
181  *      This hook is called by the fs code as part of the inode creation
182  *      transaction and provides for atomic labeling of the inode, unlike
183  *      the post_create/mkdir/... hooks called by the VFS.  The hook function
184  *      is expected to allocate the name and value via kmalloc, with the caller
185  *      being responsible for calling kfree after using them.
186  *      If the security module does not use security attributes or does
187  *      not wish to put a security attribute on this particular inode,
188  *      then it should return -EOPNOTSUPP to skip this processing.
189  *      @inode contains the inode structure of the newly created inode.
190  *      @dir contains the inode structure of the parent directory.
191  *      @qstr contains the last path component of the new object
192  *      @name will be set to the allocated name suffix (e.g. selinux).
193  *      @value will be set to the allocated attribute value.
194  *      @len will be set to the length of the value.
195  *      Returns 0 if @name and @value have been successfully set,
196  *              -EOPNOTSUPP if no security attribute is needed, or
197  *              -ENOMEM on memory allocation failure.
198  * @inode_create:
199  *      Check permission to create a regular file.
200  *      @dir contains inode structure of the parent of the new file.
201  *      @dentry contains the dentry structure for the file to be created.
202  *      @mode contains the file mode of the file to be created.
203  *      Return 0 if permission is granted.
204  * @inode_link:
205  *      Check permission before creating a new hard link to a file.
206  *      @old_dentry contains the dentry structure for an existing
207  *      link to the file.
208  *      @dir contains the inode structure of the parent directory
209  *      of the new link.
210  *      @new_dentry contains the dentry structure for the new link.
211  *      Return 0 if permission is granted.
212  * @path_link:
213  *      Check permission before creating a new hard link to a file.
214  *      @old_dentry contains the dentry structure for an existing link
215  *      to the file.
216  *      @new_dir contains the path structure of the parent directory of
217  *      the new link.
218  *      @new_dentry contains the dentry structure for the new link.
219  *      Return 0 if permission is granted.
220  * @inode_unlink:
221  *      Check the permission to remove a hard link to a file.
222  *      @dir contains the inode structure of parent directory of the file.
223  *      @dentry contains the dentry structure for file to be unlinked.
224  *      Return 0 if permission is granted.
225  * @path_unlink:
226  *      Check the permission to remove a hard link to a file.
227  *      @dir contains the path structure of parent directory of the file.
228  *      @dentry contains the dentry structure for file to be unlinked.
229  *      Return 0 if permission is granted.
230  * @inode_symlink:
231  *      Check the permission to create a symbolic link to a file.
232  *      @dir contains the inode structure of parent directory of
233  *      the symbolic link.
234  *      @dentry contains the dentry structure of the symbolic link.
235  *      @old_name contains the pathname of file.
236  *      Return 0 if permission is granted.
237  * @path_symlink:
238  *      Check the permission to create a symbolic link to a file.
239  *      @dir contains the path structure of parent directory of
240  *      the symbolic link.
241  *      @dentry contains the dentry structure of the symbolic link.
242  *      @old_name contains the pathname of file.
243  *      Return 0 if permission is granted.
244  * @inode_mkdir:
245  *      Check permissions to create a new directory in the existing directory
246  *      associated with inode structure @dir.
247  *      @dir contains the inode structure of parent of the directory
248  *      to be created.
249  *      @dentry contains the dentry structure of new directory.
250  *      @mode contains the mode of new directory.
251  *      Return 0 if permission is granted.
252  * @path_mkdir:
253  *      Check permissions to create a new directory in the existing directory
254  *      associated with path structure @path.
255  *      @dir contains the path structure of parent of the directory
256  *      to be created.
257  *      @dentry contains the dentry structure of new directory.
258  *      @mode contains the mode of new directory.
259  *      Return 0 if permission is granted.
260  * @inode_rmdir:
261  *      Check the permission to remove a directory.
262  *      @dir contains the inode structure of parent of the directory
263  *      to be removed.
264  *      @dentry contains the dentry structure of directory to be removed.
265  *      Return 0 if permission is granted.
266  * @path_rmdir:
267  *      Check the permission to remove a directory.
268  *      @dir contains the path structure of parent of the directory to be
269  *      removed.
270  *      @dentry contains the dentry structure of directory to be removed.
271  *      Return 0 if permission is granted.
272  * @inode_mknod:
273  *      Check permissions when creating a special file (or a socket or a fifo
274  *      file created via the mknod system call).  Note that if mknod operation
275  *      is being done for a regular file, then the create hook will be called
276  *      and not this hook.
277  *      @dir contains the inode structure of parent of the new file.
278  *      @dentry contains the dentry structure of the new file.
279  *      @mode contains the mode of the new file.
280  *      @dev contains the device number.
281  *      Return 0 if permission is granted.
282  * @path_mknod:
283  *      Check permissions when creating a file. Note that this hook is called
284  *      even if mknod operation is being done for a regular file.
285  *      @dir contains the path structure of parent of the new file.
286  *      @dentry contains the dentry structure of the new file.
287  *      @mode contains the mode of the new file.
288  *      @dev contains the undecoded device number. Use new_decode_dev() to get
289  *      the decoded device number.
290  *      Return 0 if permission is granted.
291  * @inode_rename:
292  *      Check for permission to rename a file or directory.
293  *      @old_dir contains the inode structure for parent of the old link.
294  *      @old_dentry contains the dentry structure of the old link.
295  *      @new_dir contains the inode structure for parent of the new link.
296  *      @new_dentry contains the dentry structure of the new link.
297  *      Return 0 if permission is granted.
298  * @path_rename:
299  *      Check for permission to rename a file or directory.
300  *      @old_dir contains the path structure for parent of the old link.
301  *      @old_dentry contains the dentry structure of the old link.
302  *      @new_dir contains the path structure for parent of the new link.
303  *      @new_dentry contains the dentry structure of the new link.
304  *      Return 0 if permission is granted.
305  * @path_chmod:
306  *      Check for permission to change DAC's permission of a file or directory.
307  *      @dentry contains the dentry structure.
308  *      @mnt contains the vfsmnt structure.
309  *      @mode contains DAC's mode.
310  *      Return 0 if permission is granted.
311  * @path_chown:
312  *      Check for permission to change owner/group of a file or directory.
313  *      @path contains the path structure.
314  *      @uid contains new owner's ID.
315  *      @gid contains new group's ID.
316  *      Return 0 if permission is granted.
317  * @path_chroot:
318  *      Check for permission to change root directory.
319  *      @path contains the path structure.
320  *      Return 0 if permission is granted.
321  * @inode_readlink:
322  *      Check the permission to read the symbolic link.
323  *      @dentry contains the dentry structure for the file link.
324  *      Return 0 if permission is granted.
325  * @inode_follow_link:
326  *      Check permission to follow a symbolic link when looking up a pathname.
327  *      @dentry contains the dentry structure for the link.
328  *      @inode contains the inode, which itself is not stable in RCU-walk
329  *      @rcu indicates whether we are in RCU-walk mode.
330  *      Return 0 if permission is granted.
331  * @inode_permission:
332  *      Check permission before accessing an inode.  This hook is called by the
333  *      existing Linux permission function, so a security module can use it to
334  *      provide additional checking for existing Linux permission checks.
335  *      Notice that this hook is called when a file is opened (as well as many
336  *      other operations), whereas the file_security_ops permission hook is
337  *      called when the actual read/write operations are performed.
338  *      @inode contains the inode structure to check.
339  *      @mask contains the permission mask.
340  *      Return 0 if permission is granted.
341  * @inode_setattr:
342  *      Check permission before setting file attributes.  Note that the kernel
343  *      call to notify_change is performed from several locations, whenever
344  *      file attributes change (such as when a file is truncated, chown/chmod
345  *      operations, transferring disk quotas, etc).
346  *      @dentry contains the dentry structure for the file.
347  *      @attr is the iattr structure containing the new file attributes.
348  *      Return 0 if permission is granted.
349  * @path_truncate:
350  *      Check permission before truncating a file.
351  *      @path contains the path structure for the file.
352  *      Return 0 if permission is granted.
353  * @inode_getattr:
354  *      Check permission before obtaining file attributes.
355  *      @mnt is the vfsmount where the dentry was looked up
356  *      @dentry contains the dentry structure for the file.
357  *      Return 0 if permission is granted.
358  * @inode_setxattr:
359  *      Check permission before setting the extended attributes
360  *      @value identified by @name for @dentry.
361  *      Return 0 if permission is granted.
362  * @inode_post_setxattr:
363  *      Update inode security field after successful setxattr operation.
364  *      @value identified by @name for @dentry.
365  * @inode_getxattr:
366  *      Check permission before obtaining the extended attributes
367  *      identified by @name for @dentry.
368  *      Return 0 if permission is granted.
369  * @inode_listxattr:
370  *      Check permission before obtaining the list of extended attribute
371  *      names for @dentry.
372  *      Return 0 if permission is granted.
373  * @inode_removexattr:
374  *      Check permission before removing the extended attribute
375  *      identified by @name for @dentry.
376  *      Return 0 if permission is granted.
377  * @inode_getsecurity:
378  *      Retrieve a copy of the extended attribute representation of the
379  *      security label associated with @name for @inode via @buffer.  Note that
380  *      @name is the remainder of the attribute name after the security prefix
381  *      has been removed. @alloc is used to specify of the call should return a
382  *      value via the buffer or just the value length Return size of buffer on
383  *      success.
384  * @inode_setsecurity:
385  *      Set the security label associated with @name for @inode from the
386  *      extended attribute value @value.  @size indicates the size of the
387  *      @value in bytes.  @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
388  *      Note that @name is the remainder of the attribute name after the
389  *      security. prefix has been removed.
390  *      Return 0 on success.
391  * @inode_listsecurity:
392  *      Copy the extended attribute names for the security labels
393  *      associated with @inode into @buffer.  The maximum size of @buffer
394  *      is specified by @buffer_size.  @buffer may be NULL to request
395  *      the size of the buffer required.
396  *      Returns number of bytes used/required on success.
397  * @inode_need_killpriv:
398  *      Called when an inode has been changed.
399  *      @dentry is the dentry being changed.
400  *      Return <0 on error to abort the inode change operation.
401  *      Return 0 if inode_killpriv does not need to be called.
402  *      Return >0 if inode_killpriv does need to be called.
403  * @inode_killpriv:
404  *      The setuid bit is being removed.  Remove similar security labels.
405  *      Called with the dentry->d_inode->i_mutex held.
406  *      @dentry is the dentry being changed.
407  *      Return 0 on success.  If error is returned, then the operation
408  *      causing setuid bit removal is failed.
409  * @inode_getsecid:
410  *      Get the secid associated with the node.
411  *      @inode contains a pointer to the inode.
412  *      @secid contains a pointer to the location where result will be saved.
413  *      In case of failure, @secid will be set to zero.
414  * @inode_copy_up:
415  *      A file is about to be copied up from lower layer to upper layer of
416  *      overlay filesystem. Security module can prepare a set of new creds
417  *      and modify as need be and return new creds. Caller will switch to
418  *      new creds temporarily to create new file and release newly allocated
419  *      creds.
420  *      @src indicates the union dentry of file that is being copied up.
421  *      @new pointer to pointer to return newly allocated creds.
422  *      Returns 0 on success or a negative error code on error.
423  * @inode_copy_up_xattr:
424  *      Filter the xattrs being copied up when a unioned file is copied
425  *      up from a lower layer to the union/overlay layer.
426  *      @name indicates the name of the xattr.
427  *      Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP if
428  *      security module does not know about attribute or a negative error code
429  *      to abort the copy up. Note that the caller is responsible for reading
430  *      and writing the xattrs as this hook is merely a filter.
431  *
432  * Security hooks for file operations
433  *
434  * @file_permission:
435  *      Check file permissions before accessing an open file.  This hook is
436  *      called by various operations that read or write files.  A security
437  *      module can use this hook to perform additional checking on these
438  *      operations, e.g.  to revalidate permissions on use to support privilege
439  *      bracketing or policy changes.  Notice that this hook is used when the
440  *      actual read/write operations are performed, whereas the
441  *      inode_security_ops hook is called when a file is opened (as well as
442  *      many other operations).
443  *      Caveat:  Although this hook can be used to revalidate permissions for
444  *      various system call operations that read or write files, it does not
445  *      address the revalidation of permissions for memory-mapped files.
446  *      Security modules must handle this separately if they need such
447  *      revalidation.
448  *      @file contains the file structure being accessed.
449  *      @mask contains the requested permissions.
450  *      Return 0 if permission is granted.
451  * @file_alloc_security:
452  *      Allocate and attach a security structure to the file->f_security field.
453  *      The security field is initialized to NULL when the structure is first
454  *      created.
455  *      @file contains the file structure to secure.
456  *      Return 0 if the hook is successful and permission is granted.
457  * @file_free_security:
458  *      Deallocate and free any security structures stored in file->f_security.
459  *      @file contains the file structure being modified.
460  * @file_ioctl:
461  *      @file contains the file structure.
462  *      @cmd contains the operation to perform.
463  *      @arg contains the operational arguments.
464  *      Check permission for an ioctl operation on @file.  Note that @arg
465  *      sometimes represents a user space pointer; in other cases, it may be a
466  *      simple integer value.  When @arg represents a user space pointer, it
467  *      should never be used by the security module.
468  *      Return 0 if permission is granted.
469  * @mmap_addr :
470  *      Check permissions for a mmap operation at @addr.
471  *      @addr contains virtual address that will be used for the operation.
472  *      Return 0 if permission is granted.
473  * @mmap_file :
474  *      Check permissions for a mmap operation.  The @file may be NULL, e.g.
475  *      if mapping anonymous memory.
476  *      @file contains the file structure for file to map (may be NULL).
477  *      @reqprot contains the protection requested by the application.
478  *      @prot contains the protection that will be applied by the kernel.
479  *      @flags contains the operational flags.
480  *      Return 0 if permission is granted.
481  * @file_mprotect:
482  *      Check permissions before changing memory access permissions.
483  *      @vma contains the memory region to modify.
484  *      @reqprot contains the protection requested by the application.
485  *      @prot contains the protection that will be applied by the kernel.
486  *      Return 0 if permission is granted.
487  * @file_lock:
488  *      Check permission before performing file locking operations.
489  *      Note: this hook mediates both flock and fcntl style locks.
490  *      @file contains the file structure.
491  *      @cmd contains the posix-translated lock operation to perform
492  *      (e.g. F_RDLCK, F_WRLCK).
493  *      Return 0 if permission is granted.
494  * @file_fcntl:
495  *      Check permission before allowing the file operation specified by @cmd
496  *      from being performed on the file @file.  Note that @arg sometimes
497  *      represents a user space pointer; in other cases, it may be a simple
498  *      integer value.  When @arg represents a user space pointer, it should
499  *      never be used by the security module.
500  *      @file contains the file structure.
501  *      @cmd contains the operation to be performed.
502  *      @arg contains the operational arguments.
503  *      Return 0 if permission is granted.
504  * @file_set_fowner:
505  *      Save owner security information (typically from current->security) in
506  *      file->f_security for later use by the send_sigiotask hook.
507  *      @file contains the file structure to update.
508  *      Return 0 on success.
509  * @file_send_sigiotask:
510  *      Check permission for the file owner @fown to send SIGIO or SIGURG to the
511  *      process @tsk.  Note that this hook is sometimes called from interrupt.
512  *      Note that the fown_struct, @fown, is never outside the context of a
513  *      struct file, so the file structure (and associated security information)
514  *      can always be obtained:
515  *              container_of(fown, struct file, f_owner)
516  *      @tsk contains the structure of task receiving signal.
517  *      @fown contains the file owner information.
518  *      @sig is the signal that will be sent.  When 0, kernel sends SIGIO.
519  *      Return 0 if permission is granted.
520  * @file_receive:
521  *      This hook allows security modules to control the ability of a process
522  *      to receive an open file descriptor via socket IPC.
523  *      @file contains the file structure being received.
524  *      Return 0 if permission is granted.
525  * @file_open
526  *      Save open-time permission checking state for later use upon
527  *      file_permission, and recheck access if anything has changed
528  *      since inode_permission.
529  *
530  * Security hooks for task operations.
531  *
532  * @task_create:
533  *      Check permission before creating a child process.  See the clone(2)
534  *      manual page for definitions of the @clone_flags.
535  *      @clone_flags contains the flags indicating what should be shared.
536  *      Return 0 if permission is granted.
537  * @task_free:
538  *      @task task being freed
539  *      Handle release of task-related resources. (Note that this can be called
540  *      from interrupt context.)
541  * @cred_alloc_blank:
542  *      @cred points to the credentials.
543  *      @gfp indicates the atomicity of any memory allocations.
544  *      Only allocate sufficient memory and attach to @cred such that
545  *      cred_transfer() will not get ENOMEM.
546  * @cred_free:
547  *      @cred points to the credentials.
548  *      Deallocate and clear the cred->security field in a set of credentials.
549  * @cred_prepare:
550  *      @new points to the new credentials.
551  *      @old points to the original credentials.
552  *      @gfp indicates the atomicity of any memory allocations.
553  *      Prepare a new set of credentials by copying the data from the old set.
554  * @cred_transfer:
555  *      @new points to the new credentials.
556  *      @old points to the original credentials.
557  *      Transfer data from original creds to new creds
558  * @kernel_act_as:
559  *      Set the credentials for a kernel service to act as (subjective context).
560  *      @new points to the credentials to be modified.
561  *      @secid specifies the security ID to be set
562  *      The current task must be the one that nominated @secid.
563  *      Return 0 if successful.
564  * @kernel_create_files_as:
565  *      Set the file creation context in a set of credentials to be the same as
566  *      the objective context of the specified inode.
567  *      @new points to the credentials to be modified.
568  *      @inode points to the inode to use as a reference.
569  *      The current task must be the one that nominated @inode.
570  *      Return 0 if successful.
571  * @kernel_module_request:
572  *      Ability to trigger the kernel to automatically upcall to userspace for
573  *      userspace to load a kernel module with the given name.
574  *      @kmod_name name of the module requested by the kernel
575  *      Return 0 if successful.
576  * @kernel_read_file:
577  *      Read a file specified by userspace.
578  *      @file contains the file structure pointing to the file being read
579  *      by the kernel.
580  *      @id kernel read file identifier
581  *      Return 0 if permission is granted.
582  * @kernel_post_read_file:
583  *      Read a file specified by userspace.
584  *      @file contains the file structure pointing to the file being read
585  *      by the kernel.
586  *      @buf pointer to buffer containing the file contents.
587  *      @size length of the file contents.
588  *      @id kernel read file identifier
589  *      Return 0 if permission is granted.
590  * @task_fix_setuid:
591  *      Update the module's state after setting one or more of the user
592  *      identity attributes of the current process.  The @flags parameter
593  *      indicates which of the set*uid system calls invoked this hook.  If
594  *      @new is the set of credentials that will be installed.  Modifications
595  *      should be made to this rather than to @current->cred.
596  *      @old is the set of credentials that are being replaces
597  *      @flags contains one of the LSM_SETID_* values.
598  *      Return 0 on success.
599  * @task_setpgid:
600  *      Check permission before setting the process group identifier of the
601  *      process @p to @pgid.
602  *      @p contains the task_struct for process being modified.
603  *      @pgid contains the new pgid.
604  *      Return 0 if permission is granted.
605  * @task_getpgid:
606  *      Check permission before getting the process group identifier of the
607  *      process @p.
608  *      @p contains the task_struct for the process.
609  *      Return 0 if permission is granted.
610  * @task_getsid:
611  *      Check permission before getting the session identifier of the process
612  *      @p.
613  *      @p contains the task_struct for the process.
614  *      Return 0 if permission is granted.
615  * @task_getsecid:
616  *      Retrieve the security identifier of the process @p.
617  *      @p contains the task_struct for the process and place is into @secid.
618  *      In case of failure, @secid will be set to zero.
619  *
620  * @task_setnice:
621  *      Check permission before setting the nice value of @p to @nice.
622  *      @p contains the task_struct of process.
623  *      @nice contains the new nice value.
624  *      Return 0 if permission is granted.
625  * @task_setioprio
626  *      Check permission before setting the ioprio value of @p to @ioprio.
627  *      @p contains the task_struct of process.
628  *      @ioprio contains the new ioprio value
629  *      Return 0 if permission is granted.
630  * @task_getioprio
631  *      Check permission before getting the ioprio value of @p.
632  *      @p contains the task_struct of process.
633  *      Return 0 if permission is granted.
634  * @task_setrlimit:
635  *      Check permission before setting the resource limits of the current
636  *      process for @resource to @new_rlim.  The old resource limit values can
637  *      be examined by dereferencing (current->signal->rlim + resource).
638  *      @resource contains the resource whose limit is being set.
639  *      @new_rlim contains the new limits for @resource.
640  *      Return 0 if permission is granted.
641  * @task_setscheduler:
642  *      Check permission before setting scheduling policy and/or parameters of
643  *      process @p based on @policy and @lp.
644  *      @p contains the task_struct for process.
645  *      @policy contains the scheduling policy.
646  *      @lp contains the scheduling parameters.
647  *      Return 0 if permission is granted.
648  * @task_getscheduler:
649  *      Check permission before obtaining scheduling information for process
650  *      @p.
651  *      @p contains the task_struct for process.
652  *      Return 0 if permission is granted.
653  * @task_movememory
654  *      Check permission before moving memory owned by process @p.
655  *      @p contains the task_struct for process.
656  *      Return 0 if permission is granted.
657  * @task_kill:
658  *      Check permission before sending signal @sig to @p.  @info can be NULL,
659  *      the constant 1, or a pointer to a siginfo structure.  If @info is 1 or
660  *      SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
661  *      from the kernel and should typically be permitted.
662  *      SIGIO signals are handled separately by the send_sigiotask hook in
663  *      file_security_ops.
664  *      @p contains the task_struct for process.
665  *      @info contains the signal information.
666  *      @sig contains the signal value.
667  *      @secid contains the sid of the process where the signal originated
668  *      Return 0 if permission is granted.
669  * @task_wait:
670  *      Check permission before allowing a process to reap a child process @p
671  *      and collect its status information.
672  *      @p contains the task_struct for process.
673  *      Return 0 if permission is granted.
674  * @task_prctl:
675  *      Check permission before performing a process control operation on the
676  *      current process.
677  *      @option contains the operation.
678  *      @arg2 contains a argument.
679  *      @arg3 contains a argument.
680  *      @arg4 contains a argument.
681  *      @arg5 contains a argument.
682  *      Return -ENOSYS if no-one wanted to handle this op, any other value to
683  *      cause prctl() to return immediately with that value.
684  * @task_to_inode:
685  *      Set the security attributes for an inode based on an associated task's
686  *      security attributes, e.g. for /proc/pid inodes.
687  *      @p contains the task_struct for the task.
688  *      @inode contains the inode structure for the inode.
689  *
690  * Security hooks for Netlink messaging.
691  *
692  * @netlink_send:
693  *      Save security information for a netlink message so that permission
694  *      checking can be performed when the message is processed.  The security
695  *      information can be saved using the eff_cap field of the
696  *      netlink_skb_parms structure.  Also may be used to provide fine
697  *      grained control over message transmission.
698  *      @sk associated sock of task sending the message.
699  *      @skb contains the sk_buff structure for the netlink message.
700  *      Return 0 if the information was successfully saved and message
701  *      is allowed to be transmitted.
702  *
703  * Security hooks for Unix domain networking.
704  *
705  * @unix_stream_connect:
706  *      Check permissions before establishing a Unix domain stream connection
707  *      between @sock and @other.
708  *      @sock contains the sock structure.
709  *      @other contains the peer sock structure.
710  *      @newsk contains the new sock structure.
711  *      Return 0 if permission is granted.
712  * @unix_may_send:
713  *      Check permissions before connecting or sending datagrams from @sock to
714  *      @other.
715  *      @sock contains the socket structure.
716  *      @other contains the peer socket structure.
717  *      Return 0 if permission is granted.
718  *
719  * The @unix_stream_connect and @unix_may_send hooks were necessary because
720  * Linux provides an alternative to the conventional file name space for Unix
721  * domain sockets.  Whereas binding and connecting to sockets in the file name
722  * space is mediated by the typical file permissions (and caught by the mknod
723  * and permission hooks in inode_security_ops), binding and connecting to
724  * sockets in the abstract name space is completely unmediated.  Sufficient
725  * control of Unix domain sockets in the abstract name space isn't possible
726  * using only the socket layer hooks, since we need to know the actual target
727  * socket, which is not looked up until we are inside the af_unix code.
728  *
729  * Security hooks for socket operations.
730  *
731  * @socket_create:
732  *      Check permissions prior to creating a new socket.
733  *      @family contains the requested protocol family.
734  *      @type contains the requested communications type.
735  *      @protocol contains the requested protocol.
736  *      @kern set to 1 if a kernel socket.
737  *      Return 0 if permission is granted.
738  * @socket_post_create:
739  *      This hook allows a module to update or allocate a per-socket security
740  *      structure. Note that the security field was not added directly to the
741  *      socket structure, but rather, the socket security information is stored
742  *      in the associated inode.  Typically, the inode alloc_security hook will
743  *      allocate and and attach security information to
744  *      sock->inode->i_security.  This hook may be used to update the
745  *      sock->inode->i_security field with additional information that wasn't
746  *      available when the inode was allocated.
747  *      @sock contains the newly created socket structure.
748  *      @family contains the requested protocol family.
749  *      @type contains the requested communications type.
750  *      @protocol contains the requested protocol.
751  *      @kern set to 1 if a kernel socket.
752  * @socket_bind:
753  *      Check permission before socket protocol layer bind operation is
754  *      performed and the socket @sock is bound to the address specified in the
755  *      @address parameter.
756  *      @sock contains the socket structure.
757  *      @address contains the address to bind to.
758  *      @addrlen contains the length of address.
759  *      Return 0 if permission is granted.
760  * @socket_connect:
761  *      Check permission before socket protocol layer connect operation
762  *      attempts to connect socket @sock to a remote address, @address.
763  *      @sock contains the socket structure.
764  *      @address contains the address of remote endpoint.
765  *      @addrlen contains the length of address.
766  *      Return 0 if permission is granted.
767  * @socket_listen:
768  *      Check permission before socket protocol layer listen operation.
769  *      @sock contains the socket structure.
770  *      @backlog contains the maximum length for the pending connection queue.
771  *      Return 0 if permission is granted.
772  * @socket_accept:
773  *      Check permission before accepting a new connection.  Note that the new
774  *      socket, @newsock, has been created and some information copied to it,
775  *      but the accept operation has not actually been performed.
776  *      @sock contains the listening socket structure.
777  *      @newsock contains the newly created server socket for connection.
778  *      Return 0 if permission is granted.
779  * @socket_sendmsg:
780  *      Check permission before transmitting a message to another socket.
781  *      @sock contains the socket structure.
782  *      @msg contains the message to be transmitted.
783  *      @size contains the size of message.
784  *      Return 0 if permission is granted.
785  * @socket_recvmsg:
786  *      Check permission before receiving a message from a socket.
787  *      @sock contains the socket structure.
788  *      @msg contains the message structure.
789  *      @size contains the size of message structure.
790  *      @flags contains the operational flags.
791  *      Return 0 if permission is granted.
792  * @socket_getsockname:
793  *      Check permission before the local address (name) of the socket object
794  *      @sock is retrieved.
795  *      @sock contains the socket structure.
796  *      Return 0 if permission is granted.
797  * @socket_getpeername:
798  *      Check permission before the remote address (name) of a socket object
799  *      @sock is retrieved.
800  *      @sock contains the socket structure.
801  *      Return 0 if permission is granted.
802  * @socket_getsockopt:
803  *      Check permissions before retrieving the options associated with socket
804  *      @sock.
805  *      @sock contains the socket structure.
806  *      @level contains the protocol level to retrieve option from.
807  *      @optname contains the name of option to retrieve.
808  *      Return 0 if permission is granted.
809  * @socket_setsockopt:
810  *      Check permissions before setting the options associated with socket
811  *      @sock.
812  *      @sock contains the socket structure.
813  *      @level contains the protocol level to set options for.
814  *      @optname contains the name of the option to set.
815  *      Return 0 if permission is granted.
816  * @socket_shutdown:
817  *      Checks permission before all or part of a connection on the socket
818  *      @sock is shut down.
819  *      @sock contains the socket structure.
820  *      @how contains the flag indicating how future sends and receives
821  *      are handled.
822  *      Return 0 if permission is granted.
823  * @socket_sock_rcv_skb:
824  *      Check permissions on incoming network packets.  This hook is distinct
825  *      from Netfilter's IP input hooks since it is the first time that the
826  *      incoming sk_buff @skb has been associated with a particular socket, @sk.
827  *      Must not sleep inside this hook because some callers hold spinlocks.
828  *      @sk contains the sock (not socket) associated with the incoming sk_buff.
829  *      @skb contains the incoming network data.
830  * @socket_getpeersec_stream:
831  *      This hook allows the security module to provide peer socket security
832  *      state for unix or connected tcp sockets to userspace via getsockopt
833  *      SO_GETPEERSEC.  For tcp sockets this can be meaningful if the
834  *      socket is associated with an ipsec SA.
835  *      @sock is the local socket.
836  *      @optval userspace memory where the security state is to be copied.
837  *      @optlen userspace int where the module should copy the actual length
838  *      of the security state.
839  *      @len as input is the maximum length to copy to userspace provided
840  *      by the caller.
841  *      Return 0 if all is well, otherwise, typical getsockopt return
842  *      values.
843  * @socket_getpeersec_dgram:
844  *      This hook allows the security module to provide peer socket security
845  *      state for udp sockets on a per-packet basis to userspace via
846  *      getsockopt SO_GETPEERSEC.  The application must first have indicated
847  *      the IP_PASSSEC option via getsockopt.  It can then retrieve the
848  *      security state returned by this hook for a packet via the SCM_SECURITY
849  *      ancillary message type.
850  *      @skb is the skbuff for the packet being queried
851  *      @secdata is a pointer to a buffer in which to copy the security data
852  *      @seclen is the maximum length for @secdata
853  *      Return 0 on success, error on failure.
854  * @sk_alloc_security:
855  *      Allocate and attach a security structure to the sk->sk_security field,
856  *      which is used to copy security attributes between local stream sockets.
857  * @sk_free_security:
858  *      Deallocate security structure.
859  * @sk_clone_security:
860  *      Clone/copy security structure.
861  * @sk_getsecid:
862  *      Retrieve the LSM-specific secid for the sock to enable caching
863  *      of network authorizations.
864  * @sock_graft:
865  *      Sets the socket's isec sid to the sock's sid.
866  * @inet_conn_request:
867  *      Sets the openreq's sid to socket's sid with MLS portion taken
868  *      from peer sid.
869  * @inet_csk_clone:
870  *      Sets the new child socket's sid to the openreq sid.
871  * @inet_conn_established:
872  *      Sets the connection's peersid to the secmark on skb.
873  * @secmark_relabel_packet:
874  *      check if the process should be allowed to relabel packets to
875  *      the given secid
876  * @security_secmark_refcount_inc
877  *      tells the LSM to increment the number of secmark labeling rules loaded
878  * @security_secmark_refcount_dec
879  *      tells the LSM to decrement the number of secmark labeling rules loaded
880  * @req_classify_flow:
881  *      Sets the flow's sid to the openreq sid.
882  * @tun_dev_alloc_security:
883  *      This hook allows a module to allocate a security structure for a TUN
884  *      device.
885  *      @security pointer to a security structure pointer.
886  *      Returns a zero on success, negative values on failure.
887  * @tun_dev_free_security:
888  *      This hook allows a module to free the security structure for a TUN
889  *      device.
890  *      @security pointer to the TUN device's security structure
891  * @tun_dev_create:
892  *      Check permissions prior to creating a new TUN device.
893  * @tun_dev_attach_queue:
894  *      Check permissions prior to attaching to a TUN device queue.
895  *      @security pointer to the TUN device's security structure.
896  * @tun_dev_attach:
897  *      This hook can be used by the module to update any security state
898  *      associated with the TUN device's sock structure.
899  *      @sk contains the existing sock structure.
900  *      @security pointer to the TUN device's security structure.
901  * @tun_dev_open:
902  *      This hook can be used by the module to update any security state
903  *      associated with the TUN device's security structure.
904  *      @security pointer to the TUN devices's security structure.
905  *
906  * Security hooks for XFRM operations.
907  *
908  * @xfrm_policy_alloc_security:
909  *      @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy
910  *      Database used by the XFRM system.
911  *      @sec_ctx contains the security context information being provided by
912  *      the user-level policy update program (e.g., setkey).
913  *      Allocate a security structure to the xp->security field; the security
914  *      field is initialized to NULL when the xfrm_policy is allocated.
915  *      Return 0 if operation was successful (memory to allocate, legal context)
916  *      @gfp is to specify the context for the allocation
917  * @xfrm_policy_clone_security:
918  *      @old_ctx contains an existing xfrm_sec_ctx.
919  *      @new_ctxp contains a new xfrm_sec_ctx being cloned from old.
920  *      Allocate a security structure in new_ctxp that contains the
921  *      information from the old_ctx structure.
922  *      Return 0 if operation was successful (memory to allocate).
923  * @xfrm_policy_free_security:
924  *      @ctx contains the xfrm_sec_ctx
925  *      Deallocate xp->security.
926  * @xfrm_policy_delete_security:
927  *      @ctx contains the xfrm_sec_ctx.
928  *      Authorize deletion of xp->security.
929  * @xfrm_state_alloc:
930  *      @x contains the xfrm_state being added to the Security Association
931  *      Database by the XFRM system.
932  *      @sec_ctx contains the security context information being provided by
933  *      the user-level SA generation program (e.g., setkey or racoon).
934  *      Allocate a security structure to the x->security field; the security
935  *      field is initialized to NULL when the xfrm_state is allocated. Set the
936  *      context to correspond to sec_ctx. Return 0 if operation was successful
937  *      (memory to allocate, legal context).
938  * @xfrm_state_alloc_acquire:
939  *      @x contains the xfrm_state being added to the Security Association
940  *      Database by the XFRM system.
941  *      @polsec contains the policy's security context.
942  *      @secid contains the secid from which to take the mls portion of the
943  *      context.
944  *      Allocate a security structure to the x->security field; the security
945  *      field is initialized to NULL when the xfrm_state is allocated. Set the
946  *      context to correspond to secid. Return 0 if operation was successful
947  *      (memory to allocate, legal context).
948  * @xfrm_state_free_security:
949  *      @x contains the xfrm_state.
950  *      Deallocate x->security.
951  * @xfrm_state_delete_security:
952  *      @x contains the xfrm_state.
953  *      Authorize deletion of x->security.
954  * @xfrm_policy_lookup:
955  *      @ctx contains the xfrm_sec_ctx for which the access control is being
956  *      checked.
957  *      @fl_secid contains the flow security label that is used to authorize
958  *      access to the policy xp.
959  *      @dir contains the direction of the flow (input or output).
960  *      Check permission when a flow selects a xfrm_policy for processing
961  *      XFRMs on a packet.  The hook is called when selecting either a
962  *      per-socket policy or a generic xfrm policy.
963  *      Return 0 if permission is granted, -ESRCH otherwise, or -errno
964  *      on other errors.
965  * @xfrm_state_pol_flow_match:
966  *      @x contains the state to match.
967  *      @xp contains the policy to check for a match.
968  *      @fl contains the flow to check for a match.
969  *      Return 1 if there is a match.
970  * @xfrm_decode_session:
971  *      @skb points to skb to decode.
972  *      @secid points to the flow key secid to set.
973  *      @ckall says if all xfrms used should be checked for same secid.
974  *      Return 0 if ckall is zero or all xfrms used have the same secid.
975  *
976  * Security hooks affecting all Key Management operations
977  *
978  * @key_alloc:
979  *      Permit allocation of a key and assign security data. Note that key does
980  *      not have a serial number assigned at this point.
981  *      @key points to the key.
982  *      @flags is the allocation flags
983  *      Return 0 if permission is granted, -ve error otherwise.
984  * @key_free:
985  *      Notification of destruction; free security data.
986  *      @key points to the key.
987  *      No return value.
988  * @key_permission:
989  *      See whether a specific operational right is granted to a process on a
990  *      key.
991  *      @key_ref refers to the key (key pointer + possession attribute bit).
992  *      @cred points to the credentials to provide the context against which to
993  *      evaluate the security data on the key.
994  *      @perm describes the combination of permissions required of this key.
995  *      Return 0 if permission is granted, -ve error otherwise.
996  * @key_getsecurity:
997  *      Get a textual representation of the security context attached to a key
998  *      for the purposes of honouring KEYCTL_GETSECURITY.  This function
999  *      allocates the storage for the NUL-terminated string and the caller
1000  *      should free it.
1001  *      @key points to the key to be queried.
1002  *      @_buffer points to a pointer that should be set to point to the
1003  *      resulting string (if no label or an error occurs).
1004  *      Return the length of the string (including terminating NUL) or -ve if
1005  *      an error.
1006  *      May also return 0 (and a NULL buffer pointer) if there is no label.
1007  *
1008  * Security hooks affecting all System V IPC operations.
1009  *
1010  * @ipc_permission:
1011  *      Check permissions for access to IPC
1012  *      @ipcp contains the kernel IPC permission structure
1013  *      @flag contains the desired (requested) permission set
1014  *      Return 0 if permission is granted.
1015  * @ipc_getsecid:
1016  *      Get the secid associated with the ipc object.
1017  *      @ipcp contains the kernel IPC permission structure.
1018  *      @secid contains a pointer to the location where result will be saved.
1019  *      In case of failure, @secid will be set to zero.
1020  *
1021  * Security hooks for individual messages held in System V IPC message queues
1022  * @msg_msg_alloc_security:
1023  *      Allocate and attach a security structure to the msg->security field.
1024  *      The security field is initialized to NULL when the structure is first
1025  *      created.
1026  *      @msg contains the message structure to be modified.
1027  *      Return 0 if operation was successful and permission is granted.
1028  * @msg_msg_free_security:
1029  *      Deallocate the security structure for this message.
1030  *      @msg contains the message structure to be modified.
1031  *
1032  * Security hooks for System V IPC Message Queues
1033  *
1034  * @msg_queue_alloc_security:
1035  *      Allocate and attach a security structure to the
1036  *      msq->q_perm.security field. The security field is initialized to
1037  *      NULL when the structure is first created.
1038  *      @msq contains the message queue structure to be modified.
1039  *      Return 0 if operation was successful and permission is granted.
1040  * @msg_queue_free_security:
1041  *      Deallocate security structure for this message queue.
1042  *      @msq contains the message queue structure to be modified.
1043  * @msg_queue_associate:
1044  *      Check permission when a message queue is requested through the
1045  *      msgget system call.  This hook is only called when returning the
1046  *      message queue identifier for an existing message queue, not when a
1047  *      new message queue is created.
1048  *      @msq contains the message queue to act upon.
1049  *      @msqflg contains the operation control flags.
1050  *      Return 0 if permission is granted.
1051  * @msg_queue_msgctl:
1052  *      Check permission when a message control operation specified by @cmd
1053  *      is to be performed on the message queue @msq.
1054  *      The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
1055  *      @msq contains the message queue to act upon.  May be NULL.
1056  *      @cmd contains the operation to be performed.
1057  *      Return 0 if permission is granted.
1058  * @msg_queue_msgsnd:
1059  *      Check permission before a message, @msg, is enqueued on the message
1060  *      queue, @msq.
1061  *      @msq contains the message queue to send message to.
1062  *      @msg contains the message to be enqueued.
1063  *      @msqflg contains operational flags.
1064  *      Return 0 if permission is granted.
1065  * @msg_queue_msgrcv:
1066  *      Check permission before a message, @msg, is removed from the message
1067  *      queue, @msq.  The @target task structure contains a pointer to the
1068  *      process that will be receiving the message (not equal to the current
1069  *      process when inline receives are being performed).
1070  *      @msq contains the message queue to retrieve message from.
1071  *      @msg contains the message destination.
1072  *      @target contains the task structure for recipient process.
1073  *      @type contains the type of message requested.
1074  *      @mode contains the operational flags.
1075  *      Return 0 if permission is granted.
1076  *
1077  * Security hooks for System V Shared Memory Segments
1078  *
1079  * @shm_alloc_security:
1080  *      Allocate and attach a security structure to the shp->shm_perm.security
1081  *      field.  The security field is initialized to NULL when the structure is
1082  *      first created.
1083  *      @shp contains the shared memory structure to be modified.
1084  *      Return 0 if operation was successful and permission is granted.
1085  * @shm_free_security:
1086  *      Deallocate the security struct for this memory segment.
1087  *      @shp contains the shared memory structure to be modified.
1088  * @shm_associate:
1089  *      Check permission when a shared memory region is requested through the
1090  *      shmget system call.  This hook is only called when returning the shared
1091  *      memory region identifier for an existing region, not when a new shared
1092  *      memory region is created.
1093  *      @shp contains the shared memory structure to be modified.
1094  *      @shmflg contains the operation control flags.
1095  *      Return 0 if permission is granted.
1096  * @shm_shmctl:
1097  *      Check permission when a shared memory control operation specified by
1098  *      @cmd is to be performed on the shared memory region @shp.
1099  *      The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
1100  *      @shp contains shared memory structure to be modified.
1101  *      @cmd contains the operation to be performed.
1102  *      Return 0 if permission is granted.
1103  * @shm_shmat:
1104  *      Check permissions prior to allowing the shmat system call to attach the
1105  *      shared memory segment @shp to the data segment of the calling process.
1106  *      The attaching address is specified by @shmaddr.
1107  *      @shp contains the shared memory structure to be modified.
1108  *      @shmaddr contains the address to attach memory region to.
1109  *      @shmflg contains the operational flags.
1110  *      Return 0 if permission is granted.
1111  *
1112  * Security hooks for System V Semaphores
1113  *
1114  * @sem_alloc_security:
1115  *      Allocate and attach a security structure to the sma->sem_perm.security
1116  *      field.  The security field is initialized to NULL when the structure is
1117  *      first created.
1118  *      @sma contains the semaphore structure
1119  *      Return 0 if operation was successful and permission is granted.
1120  * @sem_free_security:
1121  *      deallocate security struct for this semaphore
1122  *      @sma contains the semaphore structure.
1123  * @sem_associate:
1124  *      Check permission when a semaphore is requested through the semget
1125  *      system call.  This hook is only called when returning the semaphore
1126  *      identifier for an existing semaphore, not when a new one must be
1127  *      created.
1128  *      @sma contains the semaphore structure.
1129  *      @semflg contains the operation control flags.
1130  *      Return 0 if permission is granted.
1131  * @sem_semctl:
1132  *      Check permission when a semaphore operation specified by @cmd is to be
1133  *      performed on the semaphore @sma.  The @sma may be NULL, e.g. for
1134  *      IPC_INFO or SEM_INFO.
1135  *      @sma contains the semaphore structure.  May be NULL.
1136  *      @cmd contains the operation to be performed.
1137  *      Return 0 if permission is granted.
1138  * @sem_semop
1139  *      Check permissions before performing operations on members of the
1140  *      semaphore set @sma.  If the @alter flag is nonzero, the semaphore set
1141  *      may be modified.
1142  *      @sma contains the semaphore structure.
1143  *      @sops contains the operations to perform.
1144  *      @nsops contains the number of operations to perform.
1145  *      @alter contains the flag indicating whether changes are to be made.
1146  *      Return 0 if permission is granted.
1147  *
1148  * @binder_set_context_mgr
1149  *      Check whether @mgr is allowed to be the binder context manager.
1150  *      @mgr contains the task_struct for the task being registered.
1151  *      Return 0 if permission is granted.
1152  * @binder_transaction
1153  *      Check whether @from is allowed to invoke a binder transaction call
1154  *      to @to.
1155  *      @from contains the task_struct for the sending task.
1156  *      @to contains the task_struct for the receiving task.
1157  * @binder_transfer_binder
1158  *      Check whether @from is allowed to transfer a binder reference to @to.
1159  *      @from contains the task_struct for the sending task.
1160  *      @to contains the task_struct for the receiving task.
1161  * @binder_transfer_file
1162  *      Check whether @from is allowed to transfer @file to @to.
1163  *      @from contains the task_struct for the sending task.
1164  *      @file contains the struct file being transferred.
1165  *      @to contains the task_struct for the receiving task.
1166  *
1167  * @ptrace_access_check:
1168  *      Check permission before allowing the current process to trace the
1169  *      @child process.
1170  *      Security modules may also want to perform a process tracing check
1171  *      during an execve in the set_security or apply_creds hooks of
1172  *      tracing check during an execve in the bprm_set_creds hook of
1173  *      binprm_security_ops if the process is being traced and its security
1174  *      attributes would be changed by the execve.
1175  *      @child contains the task_struct structure for the target process.
1176  *      @mode contains the PTRACE_MODE flags indicating the form of access.
1177  *      Return 0 if permission is granted.
1178  * @ptrace_traceme:
1179  *      Check that the @parent process has sufficient permission to trace the
1180  *      current process before allowing the current process to present itself
1181  *      to the @parent process for tracing.
1182  *      @parent contains the task_struct structure for debugger process.
1183  *      Return 0 if permission is granted.
1184  * @capget:
1185  *      Get the @effective, @inheritable, and @permitted capability sets for
1186  *      the @target process.  The hook may also perform permission checking to
1187  *      determine if the current process is allowed to see the capability sets
1188  *      of the @target process.
1189  *      @target contains the task_struct structure for target process.
1190  *      @effective contains the effective capability set.
1191  *      @inheritable contains the inheritable capability set.
1192  *      @permitted contains the permitted capability set.
1193  *      Return 0 if the capability sets were successfully obtained.
1194  * @capset:
1195  *      Set the @effective, @inheritable, and @permitted capability sets for
1196  *      the current process.
1197  *      @new contains the new credentials structure for target process.
1198  *      @old contains the current credentials structure for target process.
1199  *      @effective contains the effective capability set.
1200  *      @inheritable contains the inheritable capability set.
1201  *      @permitted contains the permitted capability set.
1202  *      Return 0 and update @new if permission is granted.
1203  * @capable:
1204  *      Check whether the @tsk process has the @cap capability in the indicated
1205  *      credentials.
1206  *      @cred contains the credentials to use.
1207  *      @ns contains the user namespace we want the capability in
1208  *      @cap contains the capability <include/linux/capability.h>.
1209  *      @audit: Whether to write an audit message or not
1210  *      Return 0 if the capability is granted for @tsk.
1211  * @syslog:
1212  *      Check permission before accessing the kernel message ring or changing
1213  *      logging to the console.
1214  *      See the syslog(2) manual page for an explanation of the @type values.
1215  *      @type contains the type of action.
1216  *      @from_file indicates the context of action (if it came from /proc).
1217  *      Return 0 if permission is granted.
1218  * @settime:
1219  *      Check permission to change the system time.
1220  *      struct timespec64 is defined in include/linux/time64.h and timezone
1221  *      is defined in include/linux/time.h
1222  *      @ts contains new time
1223  *      @tz contains new timezone
1224  *      Return 0 if permission is granted.
1225  * @vm_enough_memory:
1226  *      Check permissions for allocating a new virtual mapping.
1227  *      @mm contains the mm struct it is being added to.
1228  *      @pages contains the number of pages.
1229  *      Return 0 if permission is granted.
1230  *
1231  * @ismaclabel:
1232  *      Check if the extended attribute specified by @name
1233  *      represents a MAC label. Returns 1 if name is a MAC
1234  *      attribute otherwise returns 0.
1235  *      @name full extended attribute name to check against
1236  *      LSM as a MAC label.
1237  *
1238  * @secid_to_secctx:
1239  *      Convert secid to security context.  If secdata is NULL the length of
1240  *      the result will be returned in seclen, but no secdata will be returned.
1241  *      This does mean that the length could change between calls to check the
1242  *      length and the next call which actually allocates and returns the
1243  *      secdata.
1244  *      @secid contains the security ID.
1245  *      @secdata contains the pointer that stores the converted security
1246  *      context.
1247  *      @seclen pointer which contains the length of the data
1248  * @secctx_to_secid:
1249  *      Convert security context to secid.
1250  *      @secid contains the pointer to the generated security ID.
1251  *      @secdata contains the security context.
1252  *
1253  * @release_secctx:
1254  *      Release the security context.
1255  *      @secdata contains the security context.
1256  *      @seclen contains the length of the security context.
1257  *
1258  * Security hooks for Audit
1259  *
1260  * @audit_rule_init:
1261  *      Allocate and initialize an LSM audit rule structure.
1262  *      @field contains the required Audit action.
1263  *      Fields flags are defined in include/linux/audit.h
1264  *      @op contains the operator the rule uses.
1265  *      @rulestr contains the context where the rule will be applied to.
1266  *      @lsmrule contains a pointer to receive the result.
1267  *      Return 0 if @lsmrule has been successfully set,
1268  *      -EINVAL in case of an invalid rule.
1269  *
1270  * @audit_rule_known:
1271  *      Specifies whether given @rule contains any fields related to
1272  *      current LSM.
1273  *      @rule contains the audit rule of interest.
1274  *      Return 1 in case of relation found, 0 otherwise.
1275  *
1276  * @audit_rule_match:
1277  *      Determine if given @secid matches a rule previously approved
1278  *      by @audit_rule_known.
1279  *      @secid contains the security id in question.
1280  *      @field contains the field which relates to current LSM.
1281  *      @op contains the operator that will be used for matching.
1282  *      @rule points to the audit rule that will be checked against.
1283  *      @actx points to the audit context associated with the check.
1284  *      Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
1285  *
1286  * @audit_rule_free:
1287  *      Deallocate the LSM audit rule structure previously allocated by
1288  *      audit_rule_init.
1289  *      @rule contains the allocated rule
1290  *
1291  * @inode_invalidate_secctx:
1292  *      Notify the security module that it must revalidate the security context
1293  *      of an inode.
1294  *
1295  * @inode_notifysecctx:
1296  *      Notify the security module of what the security context of an inode
1297  *      should be.  Initializes the incore security context managed by the
1298  *      security module for this inode.  Example usage:  NFS client invokes
1299  *      this hook to initialize the security context in its incore inode to the
1300  *      value provided by the server for the file when the server returned the
1301  *      file's attributes to the client.
1302  *
1303  *      Must be called with inode->i_mutex locked.
1304  *
1305  *      @inode we wish to set the security context of.
1306  *      @ctx contains the string which we wish to set in the inode.
1307  *      @ctxlen contains the length of @ctx.
1308  *
1309  * @inode_setsecctx:
1310  *      Change the security context of an inode.  Updates the
1311  *      incore security context managed by the security module and invokes the
1312  *      fs code as needed (via __vfs_setxattr_noperm) to update any backing
1313  *      xattrs that represent the context.  Example usage:  NFS server invokes
1314  *      this hook to change the security context in its incore inode and on the
1315  *      backing filesystem to a value provided by the client on a SETATTR
1316  *      operation.
1317  *
1318  *      Must be called with inode->i_mutex locked.
1319  *
1320  *      @dentry contains the inode we wish to set the security context of.
1321  *      @ctx contains the string which we wish to set in the inode.
1322  *      @ctxlen contains the length of @ctx.
1323  *
1324  * @inode_getsecctx:
1325  *      On success, returns 0 and fills out @ctx and @ctxlen with the security
1326  *      context for the given @inode.
1327  *
1328  *      @inode we wish to get the security context of.
1329  *      @ctx is a pointer in which to place the allocated security context.
1330  *      @ctxlen points to the place to put the length of @ctx.
1331  * This is the main security structure.
1332  */
1333 
1334 union security_list_options {
1335         int (*binder_set_context_mgr)(struct task_struct *mgr);
1336         int (*binder_transaction)(struct task_struct *from,
1337                                         struct task_struct *to);
1338         int (*binder_transfer_binder)(struct task_struct *from,
1339                                         struct task_struct *to);
1340         int (*binder_transfer_file)(struct task_struct *from,
1341                                         struct task_struct *to,
1342                                         struct file *file);
1343 
1344         int (*ptrace_access_check)(struct task_struct *child,
1345                                         unsigned int mode);
1346         int (*ptrace_traceme)(struct task_struct *parent);
1347         int (*capget)(struct task_struct *target, kernel_cap_t *effective,
1348                         kernel_cap_t *inheritable, kernel_cap_t *permitted);
1349         int (*capset)(struct cred *new, const struct cred *old,
1350                         const kernel_cap_t *effective,
1351                         const kernel_cap_t *inheritable,
1352                         const kernel_cap_t *permitted);
1353         int (*capable)(const struct cred *cred, struct user_namespace *ns,
1354                         int cap, int audit);
1355         int (*quotactl)(int cmds, int type, int id, struct super_block *sb);
1356         int (*quota_on)(struct dentry *dentry);
1357         int (*syslog)(int type);
1358         int (*settime)(const struct timespec64 *ts, const struct timezone *tz);
1359         int (*vm_enough_memory)(struct mm_struct *mm, long pages);
1360 
1361         int (*bprm_set_creds)(struct linux_binprm *bprm);
1362         int (*bprm_check_security)(struct linux_binprm *bprm);
1363         int (*bprm_secureexec)(struct linux_binprm *bprm);
1364         void (*bprm_committing_creds)(struct linux_binprm *bprm);
1365         void (*bprm_committed_creds)(struct linux_binprm *bprm);
1366 
1367         int (*sb_alloc_security)(struct super_block *sb);
1368         void (*sb_free_security)(struct super_block *sb);
1369         int (*sb_copy_data)(char *orig, char *copy);
1370         int (*sb_remount)(struct super_block *sb, void *data);
1371         int (*sb_kern_mount)(struct super_block *sb, int flags, void *data);
1372         int (*sb_show_options)(struct seq_file *m, struct super_block *sb);
1373         int (*sb_statfs)(struct dentry *dentry);
1374         int (*sb_mount)(const char *dev_name, const struct path *path,
1375                         const char *type, unsigned long flags, void *data);
1376         int (*sb_umount)(struct vfsmount *mnt, int flags);
1377         int (*sb_pivotroot)(const struct path *old_path, const struct path *new_path);
1378         int (*sb_set_mnt_opts)(struct super_block *sb,
1379                                 struct security_mnt_opts *opts,
1380                                 unsigned long kern_flags,
1381                                 unsigned long *set_kern_flags);
1382         int (*sb_clone_mnt_opts)(const struct super_block *oldsb,
1383                                         struct super_block *newsb);
1384         int (*sb_parse_opts_str)(char *options, struct security_mnt_opts *opts);
1385         int (*dentry_init_security)(struct dentry *dentry, int mode,
1386                                         const struct qstr *name, void **ctx,
1387                                         u32 *ctxlen);
1388         int (*dentry_create_files_as)(struct dentry *dentry, int mode,
1389                                         struct qstr *name,
1390                                         const struct cred *old,
1391                                         struct cred *new);
1392 
1393 
1394 #ifdef CONFIG_SECURITY_PATH
1395         int (*path_unlink)(const struct path *dir, struct dentry *dentry);
1396         int (*path_mkdir)(const struct path *dir, struct dentry *dentry,
1397                                 umode_t mode);
1398         int (*path_rmdir)(const struct path *dir, struct dentry *dentry);
1399         int (*path_mknod)(const struct path *dir, struct dentry *dentry,
1400                                 umode_t mode, unsigned int dev);
1401         int (*path_truncate)(const struct path *path);
1402         int (*path_symlink)(const struct path *dir, struct dentry *dentry,
1403                                 const char *old_name);
1404         int (*path_link)(struct dentry *old_dentry, const struct path *new_dir,
1405                                 struct dentry *new_dentry);
1406         int (*path_rename)(const struct path *old_dir, struct dentry *old_dentry,
1407                                 const struct path *new_dir,
1408                                 struct dentry *new_dentry);
1409         int (*path_chmod)(const struct path *path, umode_t mode);
1410         int (*path_chown)(const struct path *path, kuid_t uid, kgid_t gid);
1411         int (*path_chroot)(const struct path *path);
1412 #endif
1413 
1414         int (*inode_alloc_security)(struct inode *inode);
1415         void (*inode_free_security)(struct inode *inode);
1416         int (*inode_init_security)(struct inode *inode, struct inode *dir,
1417                                         const struct qstr *qstr,
1418                                         const char **name, void **value,
1419                                         size_t *len);
1420         int (*inode_create)(struct inode *dir, struct dentry *dentry,
1421                                 umode_t mode);
1422         int (*inode_link)(struct dentry *old_dentry, struct inode *dir,
1423                                 struct dentry *new_dentry);
1424         int (*inode_unlink)(struct inode *dir, struct dentry *dentry);
1425         int (*inode_symlink)(struct inode *dir, struct dentry *dentry,
1426                                 const char *old_name);
1427         int (*inode_mkdir)(struct inode *dir, struct dentry *dentry,
1428                                 umode_t mode);
1429         int (*inode_rmdir)(struct inode *dir, struct dentry *dentry);
1430         int (*inode_mknod)(struct inode *dir, struct dentry *dentry,
1431                                 umode_t mode, dev_t dev);
1432         int (*inode_rename)(struct inode *old_dir, struct dentry *old_dentry,
1433                                 struct inode *new_dir,
1434                                 struct dentry *new_dentry);
1435         int (*inode_readlink)(struct dentry *dentry);
1436         int (*inode_follow_link)(struct dentry *dentry, struct inode *inode,
1437                                  bool rcu);
1438         int (*inode_permission)(struct inode *inode, int mask);
1439         int (*inode_setattr)(struct dentry *dentry, struct iattr *attr);
1440         int (*inode_getattr)(const struct path *path);
1441         int (*inode_setxattr)(struct dentry *dentry, const char *name,
1442                                 const void *value, size_t size, int flags);
1443         void (*inode_post_setxattr)(struct dentry *dentry, const char *name,
1444                                         const void *value, size_t size,
1445                                         int flags);
1446         int (*inode_getxattr)(struct dentry *dentry, const char *name);
1447         int (*inode_listxattr)(struct dentry *dentry);
1448         int (*inode_removexattr)(struct dentry *dentry, const char *name);
1449         int (*inode_need_killpriv)(struct dentry *dentry);
1450         int (*inode_killpriv)(struct dentry *dentry);
1451         int (*inode_getsecurity)(struct inode *inode, const char *name,
1452                                         void **buffer, bool alloc);
1453         int (*inode_setsecurity)(struct inode *inode, const char *name,
1454                                         const void *value, size_t size,
1455                                         int flags);
1456         int (*inode_listsecurity)(struct inode *inode, char *buffer,
1457                                         size_t buffer_size);
1458         void (*inode_getsecid)(struct inode *inode, u32 *secid);
1459         int (*inode_copy_up)(struct dentry *src, struct cred **new);
1460         int (*inode_copy_up_xattr)(const char *name);
1461 
1462         int (*file_permission)(struct file *file, int mask);
1463         int (*file_alloc_security)(struct file *file);
1464         void (*file_free_security)(struct file *file);
1465         int (*file_ioctl)(struct file *file, unsigned int cmd,
1466                                 unsigned long arg);
1467         int (*mmap_addr)(unsigned long addr);
1468         int (*mmap_file)(struct file *file, unsigned long reqprot,
1469                                 unsigned long prot, unsigned long flags);
1470         int (*file_mprotect)(struct vm_area_struct *vma, unsigned long reqprot,
1471                                 unsigned long prot);
1472         int (*file_lock)(struct file *file, unsigned int cmd);
1473         int (*file_fcntl)(struct file *file, unsigned int cmd,
1474                                 unsigned long arg);
1475         void (*file_set_fowner)(struct file *file);
1476         int (*file_send_sigiotask)(struct task_struct *tsk,
1477                                         struct fown_struct *fown, int sig);
1478         int (*file_receive)(struct file *file);
1479         int (*file_open)(struct file *file, const struct cred *cred);
1480 
1481         int (*task_create)(unsigned long clone_flags);
1482         void (*task_free)(struct task_struct *task);
1483         int (*cred_alloc_blank)(struct cred *cred, gfp_t gfp);
1484         void (*cred_free)(struct cred *cred);
1485         int (*cred_prepare)(struct cred *new, const struct cred *old,
1486                                 gfp_t gfp);
1487         void (*cred_transfer)(struct cred *new, const struct cred *old);
1488         int (*kernel_act_as)(struct cred *new, u32 secid);
1489         int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
1490         int (*kernel_module_request)(char *kmod_name);
1491         int (*kernel_read_file)(struct file *file, enum kernel_read_file_id id);
1492         int (*kernel_post_read_file)(struct file *file, char *buf, loff_t size,
1493                                      enum kernel_read_file_id id);
1494         int (*task_fix_setuid)(struct cred *new, const struct cred *old,
1495                                 int flags);
1496         int (*task_setpgid)(struct task_struct *p, pid_t pgid);
1497         int (*task_getpgid)(struct task_struct *p);
1498         int (*task_getsid)(struct task_struct *p);
1499         void (*task_getsecid)(struct task_struct *p, u32 *secid);
1500         int (*task_setnice)(struct task_struct *p, int nice);
1501         int (*task_setioprio)(struct task_struct *p, int ioprio);
1502         int (*task_getioprio)(struct task_struct *p);
1503         int (*task_setrlimit)(struct task_struct *p, unsigned int resource,
1504                                 struct rlimit *new_rlim);
1505         int (*task_setscheduler)(struct task_struct *p);
1506         int (*task_getscheduler)(struct task_struct *p);
1507         int (*task_movememory)(struct task_struct *p);
1508         int (*task_kill)(struct task_struct *p, struct siginfo *info,
1509                                 int sig, u32 secid);
1510         int (*task_wait)(struct task_struct *p);
1511         int (*task_prctl)(int option, unsigned long arg2, unsigned long arg3,
1512                                 unsigned long arg4, unsigned long arg5);
1513         void (*task_to_inode)(struct task_struct *p, struct inode *inode);
1514 
1515         int (*ipc_permission)(struct kern_ipc_perm *ipcp, short flag);
1516         void (*ipc_getsecid)(struct kern_ipc_perm *ipcp, u32 *secid);
1517 
1518         int (*msg_msg_alloc_security)(struct msg_msg *msg);
1519         void (*msg_msg_free_security)(struct msg_msg *msg);
1520 
1521         int (*msg_queue_alloc_security)(struct msg_queue *msq);
1522         void (*msg_queue_free_security)(struct msg_queue *msq);
1523         int (*msg_queue_associate)(struct msg_queue *msq, int msqflg);
1524         int (*msg_queue_msgctl)(struct msg_queue *msq, int cmd);
1525         int (*msg_queue_msgsnd)(struct msg_queue *msq, struct msg_msg *msg,
1526                                 int msqflg);
1527         int (*msg_queue_msgrcv)(struct msg_queue *msq, struct msg_msg *msg,
1528                                 struct task_struct *target, long type,
1529                                 int mode);
1530 
1531         int (*shm_alloc_security)(struct shmid_kernel *shp);
1532         void (*shm_free_security)(struct shmid_kernel *shp);
1533         int (*shm_associate)(struct shmid_kernel *shp, int shmflg);
1534         int (*shm_shmctl)(struct shmid_kernel *shp, int cmd);
1535         int (*shm_shmat)(struct shmid_kernel *shp, char __user *shmaddr,
1536                                 int shmflg);
1537 
1538         int (*sem_alloc_security)(struct sem_array *sma);
1539         void (*sem_free_security)(struct sem_array *sma);
1540         int (*sem_associate)(struct sem_array *sma, int semflg);
1541         int (*sem_semctl)(struct sem_array *sma, int cmd);
1542         int (*sem_semop)(struct sem_array *sma, struct sembuf *sops,
1543                                 unsigned nsops, int alter);
1544 
1545         int (*netlink_send)(struct sock *sk, struct sk_buff *skb);
1546 
1547         void (*d_instantiate)(struct dentry *dentry, struct inode *inode);
1548 
1549         int (*getprocattr)(struct task_struct *p, char *name, char **value);
1550         int (*setprocattr)(struct task_struct *p, char *name, void *value,
1551                                 size_t size);
1552         int (*ismaclabel)(const char *name);
1553         int (*secid_to_secctx)(u32 secid, char **secdata, u32 *seclen);
1554         int (*secctx_to_secid)(const char *secdata, u32 seclen, u32 *secid);
1555         void (*release_secctx)(char *secdata, u32 seclen);
1556 
1557         void (*inode_invalidate_secctx)(struct inode *inode);
1558         int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen);
1559         int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
1560         int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen);
1561 
1562 #ifdef CONFIG_SECURITY_NETWORK
1563         int (*unix_stream_connect)(struct sock *sock, struct sock *other,
1564                                         struct sock *newsk);
1565         int (*unix_may_send)(struct socket *sock, struct socket *other);
1566 
1567         int (*socket_create)(int family, int type, int protocol, int kern);
1568         int (*socket_post_create)(struct socket *sock, int family, int type,
1569                                         int protocol, int kern);
1570         int (*socket_bind)(struct socket *sock, struct sockaddr *address,
1571                                 int addrlen);
1572         int (*socket_connect)(struct socket *sock, struct sockaddr *address,
1573                                 int addrlen);
1574         int (*socket_listen)(struct socket *sock, int backlog);
1575         int (*socket_accept)(struct socket *sock, struct socket *newsock);
1576         int (*socket_sendmsg)(struct socket *sock, struct msghdr *msg,
1577                                 int size);
1578         int (*socket_recvmsg)(struct socket *sock, struct msghdr *msg,
1579                                 int size, int flags);
1580         int (*socket_getsockname)(struct socket *sock);
1581         int (*socket_getpeername)(struct socket *sock);
1582         int (*socket_getsockopt)(struct socket *sock, int level, int optname);
1583         int (*socket_setsockopt)(struct socket *sock, int level, int optname);
1584         int (*socket_shutdown)(struct socket *sock, int how);
1585         int (*socket_sock_rcv_skb)(struct sock *sk, struct sk_buff *skb);
1586         int (*socket_getpeersec_stream)(struct socket *sock,
1587                                         char __user *optval,
1588                                         int __user *optlen, unsigned len);
1589         int (*socket_getpeersec_dgram)(struct socket *sock,
1590                                         struct sk_buff *skb, u32 *secid);
1591         int (*sk_alloc_security)(struct sock *sk, int family, gfp_t priority);
1592         void (*sk_free_security)(struct sock *sk);
1593         void (*sk_clone_security)(const struct sock *sk, struct sock *newsk);
1594         void (*sk_getsecid)(struct sock *sk, u32 *secid);
1595         void (*sock_graft)(struct sock *sk, struct socket *parent);
1596         int (*inet_conn_request)(struct sock *sk, struct sk_buff *skb,
1597                                         struct request_sock *req);
1598         void (*inet_csk_clone)(struct sock *newsk,
1599                                 const struct request_sock *req);
1600         void (*inet_conn_established)(struct sock *sk, struct sk_buff *skb);
1601         int (*secmark_relabel_packet)(u32 secid);
1602         void (*secmark_refcount_inc)(void);
1603         void (*secmark_refcount_dec)(void);
1604         void (*req_classify_flow)(const struct request_sock *req,
1605                                         struct flowi *fl);
1606         int (*tun_dev_alloc_security)(void **security);
1607         void (*tun_dev_free_security)(void *security);
1608         int (*tun_dev_create)(void);
1609         int (*tun_dev_attach_queue)(void *security);
1610         int (*tun_dev_attach)(struct sock *sk, void *security);
1611         int (*tun_dev_open)(void *security);
1612 #endif  /* CONFIG_SECURITY_NETWORK */
1613 
1614 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1615         int (*xfrm_policy_alloc_security)(struct xfrm_sec_ctx **ctxp,
1616                                           struct xfrm_user_sec_ctx *sec_ctx,
1617                                                 gfp_t gfp);
1618         int (*xfrm_policy_clone_security)(struct xfrm_sec_ctx *old_ctx,
1619                                                 struct xfrm_sec_ctx **new_ctx);
1620         void (*xfrm_policy_free_security)(struct xfrm_sec_ctx *ctx);
1621         int (*xfrm_policy_delete_security)(struct xfrm_sec_ctx *ctx);
1622         int (*xfrm_state_alloc)(struct xfrm_state *x,
1623                                 struct xfrm_user_sec_ctx *sec_ctx);
1624         int (*xfrm_state_alloc_acquire)(struct xfrm_state *x,
1625                                         struct xfrm_sec_ctx *polsec,
1626                                         u32 secid);
1627         void (*xfrm_state_free_security)(struct xfrm_state *x);
1628         int (*xfrm_state_delete_security)(struct xfrm_state *x);
1629         int (*xfrm_policy_lookup)(struct xfrm_sec_ctx *ctx, u32 fl_secid,
1630                                         u8 dir);
1631         int (*xfrm_state_pol_flow_match)(struct xfrm_state *x,
1632                                                 struct xfrm_policy *xp,
1633                                                 const struct flowi *fl);
1634         int (*xfrm_decode_session)(struct sk_buff *skb, u32 *secid, int ckall);
1635 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1636 
1637         /* key management security hooks */
1638 #ifdef CONFIG_KEYS
1639         int (*key_alloc)(struct key *key, const struct cred *cred,
1640                                 unsigned long flags);
1641         void (*key_free)(struct key *key);
1642         int (*key_permission)(key_ref_t key_ref, const struct cred *cred,
1643                                 unsigned perm);
1644         int (*key_getsecurity)(struct key *key, char **_buffer);
1645 #endif  /* CONFIG_KEYS */
1646 
1647 #ifdef CONFIG_AUDIT
1648         int (*audit_rule_init)(u32 field, u32 op, char *rulestr,
1649                                 void **lsmrule);
1650         int (*audit_rule_known)(struct audit_krule *krule);
1651         int (*audit_rule_match)(u32 secid, u32 field, u32 op, void *lsmrule,
1652                                 struct audit_context *actx);
1653         void (*audit_rule_free)(void *lsmrule);
1654 #endif /* CONFIG_AUDIT */
1655 };
1656 
1657 struct security_hook_heads {
1658         struct list_head binder_set_context_mgr;
1659         struct list_head binder_transaction;
1660         struct list_head binder_transfer_binder;
1661         struct list_head binder_transfer_file;
1662         struct list_head ptrace_access_check;
1663         struct list_head ptrace_traceme;
1664         struct list_head capget;
1665         struct list_head capset;
1666         struct list_head capable;
1667         struct list_head quotactl;
1668         struct list_head quota_on;
1669         struct list_head syslog;
1670         struct list_head settime;
1671         struct list_head vm_enough_memory;
1672         struct list_head bprm_set_creds;
1673         struct list_head bprm_check_security;
1674         struct list_head bprm_secureexec;
1675         struct list_head bprm_committing_creds;
1676         struct list_head bprm_committed_creds;
1677         struct list_head sb_alloc_security;
1678         struct list_head sb_free_security;
1679         struct list_head sb_copy_data;
1680         struct list_head sb_remount;
1681         struct list_head sb_kern_mount;
1682         struct list_head sb_show_options;
1683         struct list_head sb_statfs;
1684         struct list_head sb_mount;
1685         struct list_head sb_umount;
1686         struct list_head sb_pivotroot;
1687         struct list_head sb_set_mnt_opts;
1688         struct list_head sb_clone_mnt_opts;
1689         struct list_head sb_parse_opts_str;
1690         struct list_head dentry_init_security;
1691         struct list_head dentry_create_files_as;
1692 #ifdef CONFIG_SECURITY_PATH
1693         struct list_head path_unlink;
1694         struct list_head path_mkdir;
1695         struct list_head path_rmdir;
1696         struct list_head path_mknod;
1697         struct list_head path_truncate;
1698         struct list_head path_symlink;
1699         struct list_head path_link;
1700         struct list_head path_rename;
1701         struct list_head path_chmod;
1702         struct list_head path_chown;
1703         struct list_head path_chroot;
1704 #endif
1705         struct list_head inode_alloc_security;
1706         struct list_head inode_free_security;
1707         struct list_head inode_init_security;
1708         struct list_head inode_create;
1709         struct list_head inode_link;
1710         struct list_head inode_unlink;
1711         struct list_head inode_symlink;
1712         struct list_head inode_mkdir;
1713         struct list_head inode_rmdir;
1714         struct list_head inode_mknod;
1715         struct list_head inode_rename;
1716         struct list_head inode_readlink;
1717         struct list_head inode_follow_link;
1718         struct list_head inode_permission;
1719         struct list_head inode_setattr;
1720         struct list_head inode_getattr;
1721         struct list_head inode_setxattr;
1722         struct list_head inode_post_setxattr;
1723         struct list_head inode_getxattr;
1724         struct list_head inode_listxattr;
1725         struct list_head inode_removexattr;
1726         struct list_head inode_need_killpriv;
1727         struct list_head inode_killpriv;
1728         struct list_head inode_getsecurity;
1729         struct list_head inode_setsecurity;
1730         struct list_head inode_listsecurity;
1731         struct list_head inode_getsecid;
1732         struct list_head inode_copy_up;
1733         struct list_head inode_copy_up_xattr;
1734         struct list_head file_permission;
1735         struct list_head file_alloc_security;
1736         struct list_head file_free_security;
1737         struct list_head file_ioctl;
1738         struct list_head mmap_addr;
1739         struct list_head mmap_file;
1740         struct list_head file_mprotect;
1741         struct list_head file_lock;
1742         struct list_head file_fcntl;
1743         struct list_head file_set_fowner;
1744         struct list_head file_send_sigiotask;
1745         struct list_head file_receive;
1746         struct list_head file_open;
1747         struct list_head task_create;
1748         struct list_head task_free;
1749         struct list_head cred_alloc_blank;
1750         struct list_head cred_free;
1751         struct list_head cred_prepare;
1752         struct list_head cred_transfer;
1753         struct list_head kernel_act_as;
1754         struct list_head kernel_create_files_as;
1755         struct list_head kernel_read_file;
1756         struct list_head kernel_post_read_file;
1757         struct list_head kernel_module_request;
1758         struct list_head task_fix_setuid;
1759         struct list_head task_setpgid;
1760         struct list_head task_getpgid;
1761         struct list_head task_getsid;
1762         struct list_head task_getsecid;
1763         struct list_head task_setnice;
1764         struct list_head task_setioprio;
1765         struct list_head task_getioprio;
1766         struct list_head task_setrlimit;
1767         struct list_head task_setscheduler;
1768         struct list_head task_getscheduler;
1769         struct list_head task_movememory;
1770         struct list_head task_kill;
1771         struct list_head task_wait;
1772         struct list_head task_prctl;
1773         struct list_head task_to_inode;
1774         struct list_head ipc_permission;
1775         struct list_head ipc_getsecid;
1776         struct list_head msg_msg_alloc_security;
1777         struct list_head msg_msg_free_security;
1778         struct list_head msg_queue_alloc_security;
1779         struct list_head msg_queue_free_security;
1780         struct list_head msg_queue_associate;
1781         struct list_head msg_queue_msgctl;
1782         struct list_head msg_queue_msgsnd;
1783         struct list_head msg_queue_msgrcv;
1784         struct list_head shm_alloc_security;
1785         struct list_head shm_free_security;
1786         struct list_head shm_associate;
1787         struct list_head shm_shmctl;
1788         struct list_head shm_shmat;
1789         struct list_head sem_alloc_security;
1790         struct list_head sem_free_security;
1791         struct list_head sem_associate;
1792         struct list_head sem_semctl;
1793         struct list_head sem_semop;
1794         struct list_head netlink_send;
1795         struct list_head d_instantiate;
1796         struct list_head getprocattr;
1797         struct list_head setprocattr;
1798         struct list_head ismaclabel;
1799         struct list_head secid_to_secctx;
1800         struct list_head secctx_to_secid;
1801         struct list_head release_secctx;
1802         struct list_head inode_invalidate_secctx;
1803         struct list_head inode_notifysecctx;
1804         struct list_head inode_setsecctx;
1805         struct list_head inode_getsecctx;
1806 #ifdef CONFIG_SECURITY_NETWORK
1807         struct list_head unix_stream_connect;
1808         struct list_head unix_may_send;
1809         struct list_head socket_create;
1810         struct list_head socket_post_create;
1811         struct list_head socket_bind;
1812         struct list_head socket_connect;
1813         struct list_head socket_listen;
1814         struct list_head socket_accept;
1815         struct list_head socket_sendmsg;
1816         struct list_head socket_recvmsg;
1817         struct list_head socket_getsockname;
1818         struct list_head socket_getpeername;
1819         struct list_head socket_getsockopt;
1820         struct list_head socket_setsockopt;
1821         struct list_head socket_shutdown;
1822         struct list_head socket_sock_rcv_skb;
1823         struct list_head socket_getpeersec_stream;
1824         struct list_head socket_getpeersec_dgram;
1825         struct list_head sk_alloc_security;
1826         struct list_head sk_free_security;
1827         struct list_head sk_clone_security;
1828         struct list_head sk_getsecid;
1829         struct list_head sock_graft;
1830         struct list_head inet_conn_request;
1831         struct list_head inet_csk_clone;
1832         struct list_head inet_conn_established;
1833         struct list_head secmark_relabel_packet;
1834         struct list_head secmark_refcount_inc;
1835         struct list_head secmark_refcount_dec;
1836         struct list_head req_classify_flow;
1837         struct list_head tun_dev_alloc_security;
1838         struct list_head tun_dev_free_security;
1839         struct list_head tun_dev_create;
1840         struct list_head tun_dev_attach_queue;
1841         struct list_head tun_dev_attach;
1842         struct list_head tun_dev_open;
1843 #endif  /* CONFIG_SECURITY_NETWORK */
1844 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1845         struct list_head xfrm_policy_alloc_security;
1846         struct list_head xfrm_policy_clone_security;
1847         struct list_head xfrm_policy_free_security;
1848         struct list_head xfrm_policy_delete_security;
1849         struct list_head xfrm_state_alloc;
1850         struct list_head xfrm_state_alloc_acquire;
1851         struct list_head xfrm_state_free_security;
1852         struct list_head xfrm_state_delete_security;
1853         struct list_head xfrm_policy_lookup;
1854         struct list_head xfrm_state_pol_flow_match;
1855         struct list_head xfrm_decode_session;
1856 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1857 #ifdef CONFIG_KEYS
1858         struct list_head key_alloc;
1859         struct list_head key_free;
1860         struct list_head key_permission;
1861         struct list_head key_getsecurity;
1862 #endif  /* CONFIG_KEYS */
1863 #ifdef CONFIG_AUDIT
1864         struct list_head audit_rule_init;
1865         struct list_head audit_rule_known;
1866         struct list_head audit_rule_match;
1867         struct list_head audit_rule_free;
1868 #endif /* CONFIG_AUDIT */
1869 };
1870 
1871 /*
1872  * Security module hook list structure.
1873  * For use with generic list macros for common operations.
1874  */
1875 struct security_hook_list {
1876         struct list_head                list;
1877         struct list_head                *head;
1878         union security_list_options     hook;
1879 };
1880 
1881 /*
1882  * Initializing a security_hook_list structure takes
1883  * up a lot of space in a source file. This macro takes
1884  * care of the common case and reduces the amount of
1885  * text involved.
1886  */
1887 #define LSM_HOOK_INIT(HEAD, HOOK) \
1888         { .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
1889 
1890 extern struct security_hook_heads security_hook_heads;
1891 
1892 static inline void security_add_hooks(struct security_hook_list *hooks,
1893                                       int count)
1894 {
1895         int i;
1896 
1897         for (i = 0; i < count; i++)
1898                 list_add_tail_rcu(&hooks[i].list, hooks[i].head);
1899 }
1900 
1901 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1902 /*
1903  * Assuring the safety of deleting a security module is up to
1904  * the security module involved. This may entail ordering the
1905  * module's hook list in a particular way, refusing to disable
1906  * the module once a policy is loaded or any number of other
1907  * actions better imagined than described.
1908  *
1909  * The name of the configuration option reflects the only module
1910  * that currently uses the mechanism. Any developer who thinks
1911  * disabling their module is a good idea needs to be at least as
1912  * careful as the SELinux team.
1913  */
1914 static inline void security_delete_hooks(struct security_hook_list *hooks,
1915                                                 int count)
1916 {
1917         int i;
1918 
1919         for (i = 0; i < count; i++)
1920                 list_del_rcu(&hooks[i].list);
1921 }
1922 #endif /* CONFIG_SECURITY_SELINUX_DISABLE */
1923 
1924 extern int __init security_module_enable(const char *module);
1925 extern void __init capability_add_hooks(void);
1926 #ifdef CONFIG_SECURITY_YAMA
1927 extern void __init yama_add_hooks(void);
1928 #else
1929 static inline void __init yama_add_hooks(void) { }
1930 #endif
1931 #ifdef CONFIG_SECURITY_LOADPIN
1932 void __init loadpin_add_hooks(void);
1933 #else
1934 static inline void loadpin_add_hooks(void) { };
1935 #endif
1936 
1937 #endif /* ! __LINUX_LSM_HOOKS_H */
1938 

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