security/dummy.c

   1 /*
   2  * Stub functions for the default security function pointers in case no
   3  * security model is loaded.
   4  *
   5  * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
   6  * Copyright (C) 2001-2002  Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  */
  14
  15 #undef DEBUG
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/mman.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/swap.h>
  23 #include <linux/security.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/netlink.h>
  26 #include <net/sock.h>
  27 #include <linux/xattr.h>
  28 #include <linux/hugetlb.h>
  29 #include <linux/ptrace.h>
  30 #include <linux/file.h>
  31
  32 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
  33 {
  34         return 0;
  35 }
  36
  37 static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
  38                          kernel_cap_t * inheritable, kernel_cap_t * permitted)
  39 {
  40         *effective = *inheritable = *permitted = 0;
  41         if (!issecure(SECURE_NOROOT)) {
  42                 if (target->euid == 0) {
  43                         *permitted |= (~0 & ~CAP_FS_MASK);
  44                         *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
  45                 }
  46                 if (target->fsuid == 0) {
  47                         *permitted |= CAP_FS_MASK;
  48                         *effective |= CAP_FS_MASK;
  49                 }
  50         }
  51         return 0;
  52 }
  53
  54 static int dummy_capset_check (struct task_struct *target,
  55                                kernel_cap_t * effective,
  56                                kernel_cap_t * inheritable,
  57                                kernel_cap_t * permitted)
  58 {
  59         return -EPERM;
  60 }
  61
  62 static void dummy_capset_set (struct task_struct *target,
  63                               kernel_cap_t * effective,
  64                               kernel_cap_t * inheritable,
  65                               kernel_cap_t * permitted)
  66 {
  67         return;
  68 }
  69
  70 static int dummy_acct (struct file *file)
  71 {
  72         return 0;
  73 }
  74
  75 static int dummy_capable (struct task_struct *tsk, int cap)
  76 {
  77         if (cap_raised (tsk->cap_effective, cap))
  78                 return 0;
  79         return -EPERM;
  80 }
  81
  82 static int dummy_sysctl (ctl_table * table, int op)
  83 {
  84         return 0;
  85 }
  86
  87 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
  88 {
  89         return 0;
  90 }
  91
  92 static int dummy_quota_on (struct dentry *dentry)
  93 {
  94         return 0;
  95 }
  96
  97 static int dummy_syslog (int type)
  98 {
  99         if ((type != 3 && type != 10) && current->euid)
 100                 return -EPERM;
 101         return 0;
 102 }
 103
 104 static int dummy_settime(struct timespec *ts, struct timezone *tz)
 105 {
 106         if (!capable(CAP_SYS_TIME))
 107                 return -EPERM;
 108         return 0;
 109 }
 110
 111 static int dummy_vm_enough_memory(long pages)
 112 {
 113         int cap_sys_admin = 0;
 114
 115         if (dummy_capable(current, CAP_SYS_ADMIN) == 0)
 116                 cap_sys_admin = 1;
 117         return __vm_enough_memory(pages, cap_sys_admin);
 118 }
 119
 120 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
 121 {
 122         return 0;
 123 }
 124
 125 static void dummy_bprm_free_security (struct linux_binprm *bprm)
 126 {
 127         return;
 128 }
 129
 130 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
 131 {
 132         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
 133                 current->mm->dumpable = suid_dumpable;
 134
 135                 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
 136                         bprm->e_uid = current->uid;
 137                         bprm->e_gid = current->gid;
 138                 }
 139         }
 140
 141         current->suid = current->euid = current->fsuid = bprm->e_uid;
 142         current->sgid = current->egid = current->fsgid = bprm->e_gid;
 143
 144         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
 145 }
 146
 147 static void dummy_bprm_post_apply_creds (struct linux_binprm *bprm)
 148 {
 149         return;
 150 }
 151
 152 static int dummy_bprm_set_security (struct linux_binprm *bprm)
 153 {
 154         return 0;
 155 }
 156
 157 static int dummy_bprm_check_security (struct linux_binprm *bprm)
 158 {
 159         return 0;
 160 }
 161
 162 static int dummy_bprm_secureexec (struct linux_binprm *bprm)
 163 {
 164         /* The new userland will simply use the value provided
 165            in the AT_SECURE field to decide whether secure mode
 166            is required.  Hence, this logic is required to preserve
 167            the legacy decision algorithm used by the old userland. */
 168         return (current->euid != current->uid ||
 169                 current->egid != current->gid);
 170 }
 171
 172 static int dummy_sb_alloc_security (struct super_block *sb)
 173 {
 174         return 0;
 175 }
 176
 177 static void dummy_sb_free_security (struct super_block *sb)
 178 {
 179         return;
 180 }
 181
 182 static int dummy_sb_copy_data (struct file_system_type *type,
 183                                void *orig, void *copy)
 184 {
 185         return 0;
 186 }
 187
 188 static int dummy_sb_kern_mount (struct super_block *sb, void *data)
 189 {
 190         return 0;
 191 }
 192
 193 static int dummy_sb_statfs (struct dentry *dentry)
 194 {
 195         return 0;
 196 }
 197
 198 static int dummy_sb_mount (char *dev_name, struct nameidata *nd, char *type,
 199                            unsigned long flags, void *data)
 200 {
 201         return 0;
 202 }
 203
 204 static int dummy_sb_check_sb (struct vfsmount *mnt, struct nameidata *nd)
 205 {
 206         return 0;
 207 }
 208
 209 static int dummy_sb_umount (struct vfsmount *mnt, int flags)
 210 {
 211         return 0;
 212 }
 213
 214 static void dummy_sb_umount_close (struct vfsmount *mnt)
 215 {
 216         return;
 217 }
 218
 219 static void dummy_sb_umount_busy (struct vfsmount *mnt)
 220 {
 221         return;
 222 }
 223
 224 static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
 225                                    void *data)
 226 {
 227         return;
 228 }
 229
 230
 231 static void dummy_sb_post_mountroot (void)
 232 {
 233         return;
 234 }
 235
 236 static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
 237 {
 238         return;
 239 }
 240
 241 static int dummy_sb_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 242 {
 243         return 0;
 244 }
 245
 246 static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 247 {
 248         return;
 249 }
 250
 251 static int dummy_inode_alloc_security (struct inode *inode)
 252 {
 253         return 0;
 254 }
 255
 256 static void dummy_inode_free_security (struct inode *inode)
 257 {
 258         return;
 259 }
 260
 261 static int dummy_inode_init_security (struct inode *inode, struct inode *dir,
 262                                       char **name, void **value, size_t *len)
 263 {
 264         return -EOPNOTSUPP;
 265 }
 266
 267 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
 268                                int mask)
 269 {
 270         return 0;
 271 }
 272
 273 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
 274                              struct dentry *new_dentry)
 275 {
 276         return 0;
 277 }
 278
 279 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
 280 {
 281         return 0;
 282 }
 283
 284 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
 285                                 const char *name)
 286 {
 287         return 0;
 288 }
 289
 290 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
 291                               int mask)
 292 {
 293         return 0;
 294 }
 295
 296 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
 297 {
 298         return 0;
 299 }
 300
 301 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
 302                               int mode, dev_t dev)
 303 {
 304         return 0;
 305 }
 306
 307 static int dummy_inode_rename (struct inode *old_inode,
 308                                struct dentry *old_dentry,
 309                                struct inode *new_inode,
 310                                struct dentry *new_dentry)
 311 {
 312         return 0;
 313 }
 314
 315 static int dummy_inode_readlink (struct dentry *dentry)
 316 {
 317         return 0;
 318 }
 319
 320 static int dummy_inode_follow_link (struct dentry *dentry,
 321                                     struct nameidata *nameidata)
 322 {
 323         return 0;
 324 }
 325
 326 static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
 327 {
 328         return 0;
 329 }
 330
 331 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
 332 {
 333         return 0;
 334 }
 335
 336 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
 337 {
 338         return 0;
 339 }
 340
 341 static void dummy_inode_delete (struct inode *ino)
 342 {
 343         return;
 344 }
 345
 346 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
 347                                 size_t size, int flags)
 348 {
 349         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 350                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 351             !capable(CAP_SYS_ADMIN))
 352                 return -EPERM;
 353         return 0;
 354 }
 355
 356 static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
 357                                        size_t size, int flags)
 358 {
 359 }
 360
 361 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
 362 {
 363         return 0;
 364 }
 365
 366 static int dummy_inode_listxattr (struct dentry *dentry)
 367 {
 368         return 0;
 369 }
 370
 371 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
 372 {
 373         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 374                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 375             !capable(CAP_SYS_ADMIN))
 376                 return -EPERM;
 377         return 0;
 378 }
 379
 380 static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
 381 {
 382         return -EOPNOTSUPP;
 383 }
 384
 385 static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
 386 {
 387         return -EOPNOTSUPP;
 388 }
 389
 390 static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
 391 {
 392         return 0;
 393 }
 394
 395 static const char *dummy_inode_xattr_getsuffix(void)
 396 {
 397         return NULL;
 398 }
 399
 400 static int dummy_file_permission (struct file *file, int mask)
 401 {
 402         return 0;
 403 }
 404
 405 static int dummy_file_alloc_security (struct file *file)
 406 {
 407         return 0;
 408 }
 409
 410 static void dummy_file_free_security (struct file *file)
 411 {
 412         return;
 413 }
 414
 415 static int dummy_file_ioctl (struct file *file, unsigned int command,
 416                              unsigned long arg)
 417 {
 418         return 0;
 419 }
 420
 421 static int dummy_file_mmap (struct file *file, unsigned long reqprot,
 422                             unsigned long prot,
 423                             unsigned long flags)
 424 {
 425         return 0;
 426 }
 427
 428 static int dummy_file_mprotect (struct vm_area_struct *vma,
 429                                 unsigned long reqprot,
 430                                 unsigned long prot)
 431 {
 432         return 0;
 433 }
 434
 435 static int dummy_file_lock (struct file *file, unsigned int cmd)
 436 {
 437         return 0;
 438 }
 439
 440 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
 441                              unsigned long arg)
 442 {
 443         return 0;
 444 }
 445
 446 static int dummy_file_set_fowner (struct file *file)
 447 {
 448         return 0;
 449 }
 450
 451 static int dummy_file_send_sigiotask (struct task_struct *tsk,
 452                                       struct fown_struct *fown, int sig)
 453 {
 454         return 0;
 455 }
 456
 457 static int dummy_file_receive (struct file *file)
 458 {
 459         return 0;
 460 }
 461
 462 static int dummy_task_create (unsigned long clone_flags)
 463 {
 464         return 0;
 465 }
 466
 467 static int dummy_task_alloc_security (struct task_struct *p)
 468 {
 469         return 0;
 470 }
 471
 472 static void dummy_task_free_security (struct task_struct *p)
 473 {
 474         return;
 475 }
 476
 477 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 478 {
 479         return 0;
 480 }
 481
 482 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 483 {
 484         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
 485         return 0;
 486 }
 487
 488 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
 489 {
 490         return 0;
 491 }
 492
 493 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
 494 {
 495         return 0;
 496 }
 497
 498 static int dummy_task_getpgid (struct task_struct *p)
 499 {
 500         return 0;
 501 }
 502
 503 static int dummy_task_getsid (struct task_struct *p)
 504 {
 505         return 0;
 506 }
 507
 508 static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
 509 { }
 510
 511 static int dummy_task_setgroups (struct group_info *group_info)
 512 {
 513         return 0;
 514 }
 515
 516 static int dummy_task_setnice (struct task_struct *p, int nice)
 517 {
 518         return 0;
 519 }
 520
 521 static int dummy_task_setioprio (struct task_struct *p, int ioprio)
 522 {
 523         return 0;
 524 }
 525
 526 static int dummy_task_getioprio (struct task_struct *p)
 527 {
 528         return 0;
 529 }
 530
 531 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
 532 {
 533         return 0;
 534 }
 535
 536 static int dummy_task_setscheduler (struct task_struct *p, int policy,
 537                                     struct sched_param *lp)
 538 {
 539         return 0;
 540 }
 541
 542 static int dummy_task_getscheduler (struct task_struct *p)
 543 {
 544         return 0;
 545 }
 546
 547 static int dummy_task_movememory (struct task_struct *p)
 548 {
 549         return 0;
 550 }
 551
 552 static int dummy_task_wait (struct task_struct *p)
 553 {
 554         return 0;
 555 }
 556
 557 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
 558                             int sig, u32 secid)
 559 {
 560         return 0;
 561 }
 562
 563 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
 564                              unsigned long arg4, unsigned long arg5)
 565 {
 566         return 0;
 567 }
 568
 569 static void dummy_task_reparent_to_init (struct task_struct *p)
 570 {
 571         p->euid = p->fsuid = 0;
 572         return;
 573 }
 574
 575 static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
 576 { }
 577
 578 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
 579 {
 580         return 0;
 581 }
 582
 583 static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
 584 {
 585         return 0;
 586 }
 587
 588 static void dummy_msg_msg_free_security (struct msg_msg *msg)
 589 {
 590         return;
 591 }
 592
 593 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
 594 {
 595         return 0;
 596 }
 597
 598 static void dummy_msg_queue_free_security (struct msg_queue *msq)
 599 {
 600         return;
 601 }
 602
 603 static int dummy_msg_queue_associate (struct msg_queue *msq,
 604                                       int msqflg)
 605 {
 606         return 0;
 607 }
 608
 609 static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
 610 {
 611         return 0;
 612 }
 613
 614 static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
 615                                    int msgflg)
 616 {
 617         return 0;
 618 }
 619
 620 static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
 621                                    struct task_struct *target, long type,
 622                                    int mode)
 623 {
 624         return 0;
 625 }
 626
 627 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
 628 {
 629         return 0;
 630 }
 631
 632 static void dummy_shm_free_security (struct shmid_kernel *shp)
 633 {
 634         return;
 635 }
 636
 637 static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
 638 {
 639         return 0;
 640 }
 641
 642 static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
 643 {
 644         return 0;
 645 }
 646
 647 static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
 648                             int shmflg)
 649 {
 650         return 0;
 651 }
 652
 653 static int dummy_sem_alloc_security (struct sem_array *sma)
 654 {
 655         return 0;
 656 }
 657
 658 static void dummy_sem_free_security (struct sem_array *sma)
 659 {
 660         return;
 661 }
 662
 663 static int dummy_sem_associate (struct sem_array *sma, int semflg)
 664 {
 665         return 0;
 666 }
 667
 668 static int dummy_sem_semctl (struct sem_array *sma, int cmd)
 669 {
 670         return 0;
 671 }
 672
 673 static int dummy_sem_semop (struct sem_array *sma,
 674                             struct sembuf *sops, unsigned nsops, int alter)
 675 {
 676         return 0;
 677 }
 678
 679 static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
 680 {
 681         NETLINK_CB(skb).eff_cap = current->cap_effective;
 682         return 0;
 683 }
 684
 685 static int dummy_netlink_recv (struct sk_buff *skb, int cap)
 686 {
 687         if (!cap_raised (NETLINK_CB (skb).eff_cap, cap))
 688                 return -EPERM;
 689         return 0;
 690 }
 691
 692 #ifdef CONFIG_SECURITY_NETWORK
 693 static int dummy_unix_stream_connect (struct socket *sock,
 694                                       struct socket *other,
 695                                       struct sock *newsk)
 696 {
 697         return 0;
 698 }
 699
 700 static int dummy_unix_may_send (struct socket *sock,
 701                                 struct socket *other)
 702 {
 703         return 0;
 704 }
 705
 706 static int dummy_socket_create (int family, int type,
 707                                 int protocol, int kern)
 708 {
 709         return 0;
 710 }
 711
 712 static void dummy_socket_post_create (struct socket *sock, int family, int type,
 713                                       int protocol, int kern)
 714 {
 715         return;
 716 }
 717
 718 static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
 719                               int addrlen)
 720 {
 721         return 0;
 722 }
 723
 724 static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
 725                                  int addrlen)
 726 {
 727         return 0;
 728 }
 729
 730 static int dummy_socket_listen (struct socket *sock, int backlog)
 731 {
 732         return 0;
 733 }
 734
 735 static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
 736 {
 737         return 0;
 738 }
 739
 740 static void dummy_socket_post_accept (struct socket *sock,
 741                                       struct socket *newsock)
 742 {
 743         return;
 744 }
 745
 746 static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
 747                                  int size)
 748 {
 749         return 0;
 750 }
 751
 752 static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
 753                                  int size, int flags)
 754 {
 755         return 0;
 756 }
 757
 758 static int dummy_socket_getsockname (struct socket *sock)
 759 {
 760         return 0;
 761 }
 762
 763 static int dummy_socket_getpeername (struct socket *sock)
 764 {
 765         return 0;
 766 }
 767
 768 static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
 769 {
 770         return 0;
 771 }
 772
 773 static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
 774 {
 775         return 0;
 776 }
 777
 778 static int dummy_socket_shutdown (struct socket *sock, int how)
 779 {
 780         return 0;
 781 }
 782
 783 static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
 784 {
 785         return 0;
 786 }
 787
 788 static int dummy_socket_getpeersec_stream(struct socket *sock, char __user *optval,
 789                                           int __user *optlen, unsigned len)
 790 {
 791         return -ENOPROTOOPT;
 792 }
 793
 794 static int dummy_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata,
 795                                          u32 *seclen)
 796 {
 797         return -ENOPROTOOPT;
 798 }
 799
 800 static inline int dummy_sk_alloc_security (struct sock *sk, int family, gfp_t priority)
 801 {
 802         return 0;
 803 }
 804
 805 static inline void dummy_sk_free_security (struct sock *sk)
 806 {
 807 }
 808
 809 static unsigned int dummy_sk_getsid(struct sock *sk, struct flowi *fl, u8 dir)
 810 {
 811         return 0;
 812 }
 813 #endif  /* CONFIG_SECURITY_NETWORK */
 814
 815 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 816 static int dummy_xfrm_policy_alloc_security(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx)
 817 {
 818         return 0;
 819 }
 820
 821 static inline int dummy_xfrm_policy_clone_security(struct xfrm_policy *old, struct xfrm_policy *new)
 822 {
 823         return 0;
 824 }
 825
 826 static void dummy_xfrm_policy_free_security(struct xfrm_policy *xp)
 827 {
 828 }
 829
 830 static int dummy_xfrm_policy_delete_security(struct xfrm_policy *xp)
 831 {
 832         return 0;
 833 }
 834
 835 static int dummy_xfrm_state_alloc_security(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
 836 {
 837         return 0;
 838 }
 839
 840 static void dummy_xfrm_state_free_security(struct xfrm_state *x)
 841 {
 842 }
 843
 844 static int dummy_xfrm_state_delete_security(struct xfrm_state *x)
 845 {
 846         return 0;
 847 }
 848
 849 static int dummy_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
 850 {
 851         return 0;
 852 }
 853 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
 854 static int dummy_register_security (const char *name, struct security_operations *ops)
 855 {
 856         return -EINVAL;
 857 }
 858
 859 static int dummy_unregister_security (const char *name, struct security_operations *ops)
 860 {
 861         return -EINVAL;
 862 }
 863
 864 static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
 865 {
 866         return;
 867 }
 868
 869 static int dummy_getprocattr(struct task_struct *p, char *name, void *value, size_t size)
 870 {
 871         return -EINVAL;
 872 }
 873
 874 static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
 875 {
 876         return -EINVAL;
 877 }
 878
 879 #ifdef CONFIG_KEYS
 880 static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
 881                                   unsigned long flags)
 882 {
 883         return 0;
 884 }
 885
 886 static inline void dummy_key_free(struct key *key)
 887 {
 888 }
 889
 890 static inline int dummy_key_permission(key_ref_t key_ref,
 891                                        struct task_struct *context,
 892                                        key_perm_t perm)
 893 {
 894         return 0;
 895 }
 896 #endif /* CONFIG_KEYS */
 897
 898 struct security_operations dummy_security_ops;
 899
 900 #define set_to_dummy_if_null(ops, function)                             \
 901         do {                                                            \
 902                 if (!ops->function) {                                   \
 903                         ops->function = dummy_##function;               \
 904                         pr_debug("Had to override the " #function       \
 905                                  " security operation with the dummy one.\n");\
 906                         }                                               \
 907         } while (0)
 908
 909 void security_fixup_ops (struct security_operations *ops)
 910 {
 911         set_to_dummy_if_null(ops, ptrace);
 912         set_to_dummy_if_null(ops, capget);
 913         set_to_dummy_if_null(ops, capset_check);
 914         set_to_dummy_if_null(ops, capset_set);
 915         set_to_dummy_if_null(ops, acct);
 916         set_to_dummy_if_null(ops, capable);
 917         set_to_dummy_if_null(ops, quotactl);
 918         set_to_dummy_if_null(ops, quota_on);
 919         set_to_dummy_if_null(ops, sysctl);
 920         set_to_dummy_if_null(ops, syslog);
 921         set_to_dummy_if_null(ops, settime);
 922         set_to_dummy_if_null(ops, vm_enough_memory);
 923         set_to_dummy_if_null(ops, bprm_alloc_security);
 924         set_to_dummy_if_null(ops, bprm_free_security);
 925         set_to_dummy_if_null(ops, bprm_apply_creds);
 926         set_to_dummy_if_null(ops, bprm_post_apply_creds);
 927         set_to_dummy_if_null(ops, bprm_set_security);
 928         set_to_dummy_if_null(ops, bprm_check_security);
 929         set_to_dummy_if_null(ops, bprm_secureexec);
 930         set_to_dummy_if_null(ops, sb_alloc_security);
 931         set_to_dummy_if_null(ops, sb_free_security);
 932         set_to_dummy_if_null(ops, sb_copy_data);
 933         set_to_dummy_if_null(ops, sb_kern_mount);
 934         set_to_dummy_if_null(ops, sb_statfs);
 935         set_to_dummy_if_null(ops, sb_mount);
 936         set_to_dummy_if_null(ops, sb_check_sb);
 937         set_to_dummy_if_null(ops, sb_umount);
 938         set_to_dummy_if_null(ops, sb_umount_close);
 939         set_to_dummy_if_null(ops, sb_umount_busy);
 940         set_to_dummy_if_null(ops, sb_post_remount);
 941         set_to_dummy_if_null(ops, sb_post_mountroot);
 942         set_to_dummy_if_null(ops, sb_post_addmount);
 943         set_to_dummy_if_null(ops, sb_pivotroot);
 944         set_to_dummy_if_null(ops, sb_post_pivotroot);
 945         set_to_dummy_if_null(ops, inode_alloc_security);
 946         set_to_dummy_if_null(ops, inode_free_security);
 947         set_to_dummy_if_null(ops, inode_init_security);
 948         set_to_dummy_if_null(ops, inode_create);
 949         set_to_dummy_if_null(ops, inode_link);
 950         set_to_dummy_if_null(ops, inode_unlink);
 951         set_to_dummy_if_null(ops, inode_symlink);
 952         set_to_dummy_if_null(ops, inode_mkdir);
 953         set_to_dummy_if_null(ops, inode_rmdir);
 954         set_to_dummy_if_null(ops, inode_mknod);
 955         set_to_dummy_if_null(ops, inode_rename);
 956         set_to_dummy_if_null(ops, inode_readlink);
 957         set_to_dummy_if_null(ops, inode_follow_link);
 958         set_to_dummy_if_null(ops, inode_permission);
 959         set_to_dummy_if_null(ops, inode_setattr);
 960         set_to_dummy_if_null(ops, inode_getattr);
 961         set_to_dummy_if_null(ops, inode_delete);
 962         set_to_dummy_if_null(ops, inode_setxattr);
 963         set_to_dummy_if_null(ops, inode_post_setxattr);
 964         set_to_dummy_if_null(ops, inode_getxattr);
 965         set_to_dummy_if_null(ops, inode_listxattr);
 966         set_to_dummy_if_null(ops, inode_removexattr);
 967         set_to_dummy_if_null(ops, inode_xattr_getsuffix);
 968         set_to_dummy_if_null(ops, inode_getsecurity);
 969         set_to_dummy_if_null(ops, inode_setsecurity);
 970         set_to_dummy_if_null(ops, inode_listsecurity);
 971         set_to_dummy_if_null(ops, file_permission);
 972         set_to_dummy_if_null(ops, file_alloc_security);
 973         set_to_dummy_if_null(ops, file_free_security);
 974         set_to_dummy_if_null(ops, file_ioctl);
 975         set_to_dummy_if_null(ops, file_mmap);
 976         set_to_dummy_if_null(ops, file_mprotect);
 977         set_to_dummy_if_null(ops, file_lock);
 978         set_to_dummy_if_null(ops, file_fcntl);
 979         set_to_dummy_if_null(ops, file_set_fowner);
 980         set_to_dummy_if_null(ops, file_send_sigiotask);
 981         set_to_dummy_if_null(ops, file_receive);
 982         set_to_dummy_if_null(ops, task_create);
 983         set_to_dummy_if_null(ops, task_alloc_security);
 984         set_to_dummy_if_null(ops, task_free_security);
 985         set_to_dummy_if_null(ops, task_setuid);
 986         set_to_dummy_if_null(ops, task_post_setuid);
 987         set_to_dummy_if_null(ops, task_setgid);
 988         set_to_dummy_if_null(ops, task_setpgid);
 989         set_to_dummy_if_null(ops, task_getpgid);
 990         set_to_dummy_if_null(ops, task_getsid);
 991         set_to_dummy_if_null(ops, task_getsecid);
 992         set_to_dummy_if_null(ops, task_setgroups);
 993         set_to_dummy_if_null(ops, task_setnice);
 994         set_to_dummy_if_null(ops, task_setioprio);
 995         set_to_dummy_if_null(ops, task_getioprio);
 996         set_to_dummy_if_null(ops, task_setrlimit);
 997         set_to_dummy_if_null(ops, task_setscheduler);
 998         set_to_dummy_if_null(ops, task_getscheduler);
 999         set_to_dummy_if_null(ops, task_movememory);
1000         set_to_dummy_if_null(ops, task_wait);
1001         set_to_dummy_if_null(ops, task_kill);
1002         set_to_dummy_if_null(ops, task_prctl);
1003         set_to_dummy_if_null(ops, task_reparent_to_init);
1004         set_to_dummy_if_null(ops, task_to_inode);
1005         set_to_dummy_if_null(ops, ipc_permission);
1006         set_to_dummy_if_null(ops, msg_msg_alloc_security);
1007         set_to_dummy_if_null(ops, msg_msg_free_security);
1008         set_to_dummy_if_null(ops, msg_queue_alloc_security);
1009         set_to_dummy_if_null(ops, msg_queue_free_security);
1010         set_to_dummy_if_null(ops, msg_queue_associate);
1011         set_to_dummy_if_null(ops, msg_queue_msgctl);
1012         set_to_dummy_if_null(ops, msg_queue_msgsnd);
1013         set_to_dummy_if_null(ops, msg_queue_msgrcv);
1014         set_to_dummy_if_null(ops, shm_alloc_security);
1015         set_to_dummy_if_null(ops, shm_free_security);
1016         set_to_dummy_if_null(ops, shm_associate);
1017         set_to_dummy_if_null(ops, shm_shmctl);
1018         set_to_dummy_if_null(ops, shm_shmat);
1019         set_to_dummy_if_null(ops, sem_alloc_security);
1020         set_to_dummy_if_null(ops, sem_free_security);
1021         set_to_dummy_if_null(ops, sem_associate);
1022         set_to_dummy_if_null(ops, sem_semctl);
1023         set_to_dummy_if_null(ops, sem_semop);
1024         set_to_dummy_if_null(ops, netlink_send);
1025         set_to_dummy_if_null(ops, netlink_recv);
1026         set_to_dummy_if_null(ops, register_security);
1027         set_to_dummy_if_null(ops, unregister_security);
1028         set_to_dummy_if_null(ops, d_instantiate);
1029         set_to_dummy_if_null(ops, getprocattr);
1030         set_to_dummy_if_null(ops, setprocattr);
1031 #ifdef CONFIG_SECURITY_NETWORK
1032         set_to_dummy_if_null(ops, unix_stream_connect);
1033         set_to_dummy_if_null(ops, unix_may_send);
1034         set_to_dummy_if_null(ops, socket_create);
1035         set_to_dummy_if_null(ops, socket_post_create);
1036         set_to_dummy_if_null(ops, socket_bind);
1037         set_to_dummy_if_null(ops, socket_connect);
1038         set_to_dummy_if_null(ops, socket_listen);
1039         set_to_dummy_if_null(ops, socket_accept);
1040         set_to_dummy_if_null(ops, socket_post_accept);
1041         set_to_dummy_if_null(ops, socket_sendmsg);
1042         set_to_dummy_if_null(ops, socket_recvmsg);
1043         set_to_dummy_if_null(ops, socket_getsockname);
1044         set_to_dummy_if_null(ops, socket_getpeername);
1045         set_to_dummy_if_null(ops, socket_setsockopt);
1046         set_to_dummy_if_null(ops, socket_getsockopt);
1047         set_to_dummy_if_null(ops, socket_shutdown);
1048         set_to_dummy_if_null(ops, socket_sock_rcv_skb);
1049         set_to_dummy_if_null(ops, socket_getpeersec_stream);
1050         set_to_dummy_if_null(ops, socket_getpeersec_dgram);
1051         set_to_dummy_if_null(ops, sk_alloc_security);
1052         set_to_dummy_if_null(ops, sk_free_security);
1053         set_to_dummy_if_null(ops, sk_getsid);
1054  #endif /* CONFIG_SECURITY_NETWORK */
1055 #ifdef  CONFIG_SECURITY_NETWORK_XFRM
1056         set_to_dummy_if_null(ops, xfrm_policy_alloc_security);
1057         set_to_dummy_if_null(ops, xfrm_policy_clone_security);
1058         set_to_dummy_if_null(ops, xfrm_policy_free_security);
1059         set_to_dummy_if_null(ops, xfrm_policy_delete_security);
1060         set_to_dummy_if_null(ops, xfrm_state_alloc_security);
1061         set_to_dummy_if_null(ops, xfrm_state_free_security);
1062         set_to_dummy_if_null(ops, xfrm_state_delete_security);
1063         set_to_dummy_if_null(ops, xfrm_policy_lookup);
1064 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1065 #ifdef CONFIG_KEYS
1066         set_to_dummy_if_null(ops, key_alloc);
1067         set_to_dummy_if_null(ops, key_free);
1068         set_to_dummy_if_null(ops, key_permission);
1069 #endif  /* CONFIG_KEYS */
1070
1071 }
1072