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/config.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_is_fs_cap (cap) ? tsk->fsuid == 0 : tsk->euid == 0)
  78                 /* capability granted */
  79                 return 0;
  80
  81         /* capability denied */
  82         return -EPERM;
  83 }
  84
  85 static int dummy_sysctl (ctl_table * table, int op)
  86 {
  87         return 0;
  88 }
  89
  90 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
  91 {
  92         return 0;
  93 }
  94
  95 static int dummy_quota_on (struct file *f)
  96 {
  97         return 0;
  98 }
  99
 100 static int dummy_syslog (int type)
 101 {
 102         if ((type != 3 && type != 10) && current->euid)
 103                 return -EPERM;
 104         return 0;
 105 }
 106
 107 static int dummy_settime(struct timespec *ts, struct timezone *tz)
 108 {
 109         if (!capable(CAP_SYS_TIME))
 110                 return -EPERM;
 111         return 0;
 112 }
 113
 114 /*
 115  * Check that a process has enough memory to allocate a new virtual
 116  * mapping. 0 means there is enough memory for the allocation to
 117  * succeed and -ENOMEM implies there is not.
 118  *
 119  * We currently support three overcommit policies, which are set via the
 120  * vm.overcommit_memory sysctl.  See Documentation/vm/overcommit-accounting
 121  */
 122 static int dummy_vm_enough_memory(long pages)
 123 {
 124         unsigned long free, allowed;
 125
 126         vm_acct_memory(pages);
 127
 128         /*
 129          * Sometimes we want to use more memory than we have
 130          */
 131         if (sysctl_overcommit_memory == OVERCOMMIT_ALWAYS)
 132                 return 0;
 133
 134         if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) {
 135                 free = get_page_cache_size();
 136                 free += nr_free_pages();
 137                 free += nr_swap_pages;
 138
 139                 /*
 140                  * Any slabs which are created with the
 141                  * SLAB_RECLAIM_ACCOUNT flag claim to have contents
 142                  * which are reclaimable, under pressure.  The dentry
 143                  * cache and most inode caches should fall into this
 144                  */
 145                 free += atomic_read(&slab_reclaim_pages);
 146
 147                 /*
 148                  * Leave the last 3% for root
 149                  */
 150                 if (current->euid)
 151                         free -= free / 32;
 152
 153                 if (free > pages)
 154                         return 0;
 155                 vm_unacct_memory(pages);
 156                 return -ENOMEM;
 157         }
 158
 159         allowed = (totalram_pages - hugetlb_total_pages())
 160                 * sysctl_overcommit_ratio / 100;
 161         allowed += total_swap_pages;
 162
 163         if (atomic_read(&vm_committed_space) < allowed)
 164                 return 0;
 165
 166         vm_unacct_memory(pages);
 167
 168         return -ENOMEM;
 169 }
 170
 171 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
 172 {
 173         return 0;
 174 }
 175
 176 static void dummy_bprm_free_security (struct linux_binprm *bprm)
 177 {
 178         return;
 179 }
 180
 181 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
 182 {
 183         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
 184                 current->mm->dumpable = suid_dumpable;
 185
 186                 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
 187                         bprm->e_uid = current->uid;
 188                         bprm->e_gid = current->gid;
 189                 }
 190         }
 191
 192         current->suid = current->euid = current->fsuid = bprm->e_uid;
 193         current->sgid = current->egid = current->fsgid = bprm->e_gid;
 194 }
 195
 196 static int dummy_bprm_set_security (struct linux_binprm *bprm)
 197 {
 198         return 0;
 199 }
 200
 201 static int dummy_bprm_check_security (struct linux_binprm *bprm)
 202 {
 203         return 0;
 204 }
 205
 206 static int dummy_bprm_secureexec (struct linux_binprm *bprm)
 207 {
 208         /* The new userland will simply use the value provided
 209            in the AT_SECURE field to decide whether secure mode
 210            is required.  Hence, this logic is required to preserve
 211            the legacy decision algorithm used by the old userland. */
 212         return (current->euid != current->uid ||
 213                 current->egid != current->gid);
 214 }
 215
 216 static int dummy_sb_alloc_security (struct super_block *sb)
 217 {
 218         return 0;
 219 }
 220
 221 static void dummy_sb_free_security (struct super_block *sb)
 222 {
 223         return;
 224 }
 225
 226 static int dummy_sb_copy_data (struct file_system_type *type,
 227                                void *orig, void *copy)
 228 {
 229         return 0;
 230 }
 231
 232 static int dummy_sb_kern_mount (struct super_block *sb, void *data)
 233 {
 234         return 0;
 235 }
 236
 237 static int dummy_sb_statfs (struct super_block *sb)
 238 {
 239         return 0;
 240 }
 241
 242 static int dummy_sb_mount (char *dev_name, struct nameidata *nd, char *type,
 243                            unsigned long flags, void *data)
 244 {
 245         return 0;
 246 }
 247
 248 static int dummy_sb_check_sb (struct vfsmount *mnt, struct nameidata *nd)
 249 {
 250         return 0;
 251 }
 252
 253 static int dummy_sb_umount (struct vfsmount *mnt, int flags)
 254 {
 255         return 0;
 256 }
 257
 258 static void dummy_sb_umount_close (struct vfsmount *mnt)
 259 {
 260         return;
 261 }
 262
 263 static void dummy_sb_umount_busy (struct vfsmount *mnt)
 264 {
 265         return;
 266 }
 267
 268 static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
 269                                    void *data)
 270 {
 271         return;
 272 }
 273
 274
 275 static void dummy_sb_post_mountroot (void)
 276 {
 277         return;
 278 }
 279
 280 static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
 281 {
 282         return;
 283 }
 284
 285 static int dummy_sb_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 286 {
 287         return 0;
 288 }
 289
 290 static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 291 {
 292         return;
 293 }
 294
 295 static int dummy_inode_alloc_security (struct inode *inode)
 296 {
 297         return 0;
 298 }
 299
 300 static void dummy_inode_free_security (struct inode *inode)
 301 {
 302         return;
 303 }
 304
 305 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
 306                                int mask)
 307 {
 308         return 0;
 309 }
 310
 311 static void dummy_inode_post_create (struct inode *inode, struct dentry *dentry,
 312                                      int mask)
 313 {
 314         return;
 315 }
 316
 317 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
 318                              struct dentry *new_dentry)
 319 {
 320         return 0;
 321 }
 322
 323 static void dummy_inode_post_link (struct dentry *old_dentry,
 324                                    struct inode *inode,
 325                                    struct dentry *new_dentry)
 326 {
 327         return;
 328 }
 329
 330 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
 331 {
 332         return 0;
 333 }
 334
 335 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
 336                                 const char *name)
 337 {
 338         return 0;
 339 }
 340
 341 static void dummy_inode_post_symlink (struct inode *inode,
 342                                       struct dentry *dentry, const char *name)
 343 {
 344         return;
 345 }
 346
 347 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
 348                               int mask)
 349 {
 350         return 0;
 351 }
 352
 353 static void dummy_inode_post_mkdir (struct inode *inode, struct dentry *dentry,
 354                                     int mask)
 355 {
 356         return;
 357 }
 358
 359 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
 360 {
 361         return 0;
 362 }
 363
 364 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
 365                               int mode, dev_t dev)
 366 {
 367         return 0;
 368 }
 369
 370 static void dummy_inode_post_mknod (struct inode *inode, struct dentry *dentry,
 371                                     int mode, dev_t dev)
 372 {
 373         return;
 374 }
 375
 376 static int dummy_inode_rename (struct inode *old_inode,
 377                                struct dentry *old_dentry,
 378                                struct inode *new_inode,
 379                                struct dentry *new_dentry)
 380 {
 381         return 0;
 382 }
 383
 384 static void dummy_inode_post_rename (struct inode *old_inode,
 385                                      struct dentry *old_dentry,
 386                                      struct inode *new_inode,
 387                                      struct dentry *new_dentry)
 388 {
 389         return;
 390 }
 391
 392 static int dummy_inode_readlink (struct dentry *dentry)
 393 {
 394         return 0;
 395 }
 396
 397 static int dummy_inode_follow_link (struct dentry *dentry,
 398                                     struct nameidata *nameidata)
 399 {
 400         return 0;
 401 }
 402
 403 static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
 404 {
 405         return 0;
 406 }
 407
 408 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
 409 {
 410         return 0;
 411 }
 412
 413 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
 414 {
 415         return 0;
 416 }
 417
 418 static void dummy_inode_delete (struct inode *ino)
 419 {
 420         return;
 421 }
 422
 423 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
 424                                 size_t size, int flags)
 425 {
 426         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 427                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 428             !capable(CAP_SYS_ADMIN))
 429                 return -EPERM;
 430         return 0;
 431 }
 432
 433 static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
 434                                        size_t size, int flags)
 435 {
 436 }
 437
 438 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
 439 {
 440         return 0;
 441 }
 442
 443 static int dummy_inode_listxattr (struct dentry *dentry)
 444 {
 445         return 0;
 446 }
 447
 448 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
 449 {
 450         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 451                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 452             !capable(CAP_SYS_ADMIN))
 453                 return -EPERM;
 454         return 0;
 455 }
 456
 457 static int dummy_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size)
 458 {
 459         return -EOPNOTSUPP;
 460 }
 461
 462 static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
 463 {
 464         return -EOPNOTSUPP;
 465 }
 466
 467 static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
 468 {
 469         return 0;
 470 }
 471
 472 static int dummy_file_permission (struct file *file, int mask)
 473 {
 474         return 0;
 475 }
 476
 477 static int dummy_file_alloc_security (struct file *file)
 478 {
 479         return 0;
 480 }
 481
 482 static void dummy_file_free_security (struct file *file)
 483 {
 484         return;
 485 }
 486
 487 static int dummy_file_ioctl (struct file *file, unsigned int command,
 488                              unsigned long arg)
 489 {
 490         return 0;
 491 }
 492
 493 static int dummy_file_mmap (struct file *file, unsigned long prot,
 494                             unsigned long flags)
 495 {
 496         return 0;
 497 }
 498
 499 static int dummy_file_mprotect (struct vm_area_struct *vma, unsigned long prot)
 500 {
 501         return 0;
 502 }
 503
 504 static int dummy_file_lock (struct file *file, unsigned int cmd)
 505 {
 506         return 0;
 507 }
 508
 509 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
 510                              unsigned long arg)
 511 {
 512         return 0;
 513 }
 514
 515 static int dummy_file_set_fowner (struct file *file)
 516 {
 517         return 0;
 518 }
 519
 520 static int dummy_file_send_sigiotask (struct task_struct *tsk,
 521                                       struct fown_struct *fown, int sig)
 522 {
 523         return 0;
 524 }
 525
 526 static int dummy_file_receive (struct file *file)
 527 {
 528         return 0;
 529 }
 530
 531 static int dummy_task_create (unsigned long clone_flags)
 532 {
 533         return 0;
 534 }
 535
 536 static int dummy_task_alloc_security (struct task_struct *p)
 537 {
 538         return 0;
 539 }
 540
 541 static void dummy_task_free_security (struct task_struct *p)
 542 {
 543         return;
 544 }
 545
 546 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 547 {
 548         return 0;
 549 }
 550
 551 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 552 {
 553         return 0;
 554 }
 555
 556 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
 557 {
 558         return 0;
 559 }
 560
 561 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
 562 {
 563         return 0;
 564 }
 565
 566 static int dummy_task_getpgid (struct task_struct *p)
 567 {
 568         return 0;
 569 }
 570
 571 static int dummy_task_getsid (struct task_struct *p)
 572 {
 573         return 0;
 574 }
 575
 576 static int dummy_task_setgroups (struct group_info *group_info)
 577 {
 578         return 0;
 579 }
 580
 581 static int dummy_task_setnice (struct task_struct *p, int nice)
 582 {
 583         return 0;
 584 }
 585
 586 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
 587 {
 588         return 0;
 589 }
 590
 591 static int dummy_task_setscheduler (struct task_struct *p, int policy,
 592                                     struct sched_param *lp)
 593 {
 594         return 0;
 595 }
 596
 597 static int dummy_task_getscheduler (struct task_struct *p)
 598 {
 599         return 0;
 600 }
 601
 602 static int dummy_task_wait (struct task_struct *p)
 603 {
 604         return 0;
 605 }
 606
 607 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
 608                             int sig)
 609 {
 610         return 0;
 611 }
 612
 613 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
 614                              unsigned long arg4, unsigned long arg5)
 615 {
 616         return 0;
 617 }
 618
 619 static void dummy_task_reparent_to_init (struct task_struct *p)
 620 {
 621         p->euid = p->fsuid = 0;
 622         return;
 623 }
 624
 625 static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
 626 { }
 627
 628 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
 629 {
 630         return 0;
 631 }
 632
 633 static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
 634 {
 635         return 0;
 636 }
 637
 638 static void dummy_msg_msg_free_security (struct msg_msg *msg)
 639 {
 640         return;
 641 }
 642
 643 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
 644 {
 645         return 0;
 646 }
 647
 648 static void dummy_msg_queue_free_security (struct msg_queue *msq)
 649 {
 650         return;
 651 }
 652
 653 static int dummy_msg_queue_associate (struct msg_queue *msq,
 654                                       int msqflg)
 655 {
 656         return 0;
 657 }
 658
 659 static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
 660 {
 661         return 0;
 662 }
 663
 664 static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
 665                                    int msgflg)
 666 {
 667         return 0;
 668 }
 669
 670 static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
 671                                    struct task_struct *target, long type,
 672                                    int mode)
 673 {
 674         return 0;
 675 }
 676
 677 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
 678 {
 679         return 0;
 680 }
 681
 682 static void dummy_shm_free_security (struct shmid_kernel *shp)
 683 {
 684         return;
 685 }
 686
 687 static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
 688 {
 689         return 0;
 690 }
 691
 692 static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
 693 {
 694         return 0;
 695 }
 696
 697 static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
 698                             int shmflg)
 699 {
 700         return 0;
 701 }
 702
 703 static int dummy_sem_alloc_security (struct sem_array *sma)
 704 {
 705         return 0;
 706 }
 707
 708 static void dummy_sem_free_security (struct sem_array *sma)
 709 {
 710         return;
 711 }
 712
 713 static int dummy_sem_associate (struct sem_array *sma, int semflg)
 714 {
 715         return 0;
 716 }
 717
 718 static int dummy_sem_semctl (struct sem_array *sma, int cmd)
 719 {
 720         return 0;
 721 }
 722
 723 static int dummy_sem_semop (struct sem_array *sma,
 724                             struct sembuf *sops, unsigned nsops, int alter)
 725 {
 726         return 0;
 727 }
 728
 729 static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
 730 {
 731         if (current->euid == 0)
 732                 cap_raise (NETLINK_CB (skb).eff_cap, CAP_NET_ADMIN);
 733         else
 734                 NETLINK_CB (skb).eff_cap = 0;
 735         return 0;
 736 }
 737
 738 static int dummy_netlink_recv (struct sk_buff *skb)
 739 {
 740         if (!cap_raised (NETLINK_CB (skb).eff_cap, CAP_NET_ADMIN))
 741                 return -EPERM;
 742         return 0;
 743 }
 744
 745 #ifdef CONFIG_SECURITY_NETWORK
 746 static int dummy_unix_stream_connect (struct socket *sock,
 747                                       struct socket *other,
 748                                       struct sock *newsk)
 749 {
 750         return 0;
 751 }
 752
 753 static int dummy_unix_may_send (struct socket *sock,
 754                                 struct socket *other)
 755 {
 756         return 0;
 757 }
 758
 759 static int dummy_socket_create (int family, int type,
 760                                 int protocol, int kern)
 761 {
 762         return 0;
 763 }
 764
 765 static void dummy_socket_post_create (struct socket *sock, int family, int type,
 766                                       int protocol, int kern)
 767 {
 768         return;
 769 }
 770
 771 static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
 772                               int addrlen)
 773 {
 774         return 0;
 775 }
 776
 777 static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
 778                                  int addrlen)
 779 {
 780         return 0;
 781 }
 782
 783 static int dummy_socket_listen (struct socket *sock, int backlog)
 784 {
 785         return 0;
 786 }
 787
 788 static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
 789 {
 790         return 0;
 791 }
 792
 793 static void dummy_socket_post_accept (struct socket *sock,
 794                                       struct socket *newsock)
 795 {
 796         return;
 797 }
 798
 799 static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
 800                                  int size)
 801 {
 802         return 0;
 803 }
 804
 805 static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
 806                                  int size, int flags)
 807 {
 808         return 0;
 809 }
 810
 811 static int dummy_socket_getsockname (struct socket *sock)
 812 {
 813         return 0;
 814 }
 815
 816 static int dummy_socket_getpeername (struct socket *sock)
 817 {
 818         return 0;
 819 }
 820
 821 static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
 822 {
 823         return 0;
 824 }
 825
 826 static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
 827 {
 828         return 0;
 829 }
 830
 831 static int dummy_socket_shutdown (struct socket *sock, int how)
 832 {
 833         return 0;
 834 }
 835
 836 static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
 837 {
 838         return 0;
 839 }
 840
 841 static int dummy_socket_getpeersec(struct socket *sock, char __user *optval,
 842                                    int __user *optlen, unsigned len)
 843 {
 844         return -ENOPROTOOPT;
 845 }
 846
 847 static inline int dummy_sk_alloc_security (struct sock *sk, int family, int priority)
 848 {
 849         return 0;
 850 }
 851
 852 static inline void dummy_sk_free_security (struct sock *sk)
 853 {
 854 }
 855 #endif  /* CONFIG_SECURITY_NETWORK */
 856
 857 static int dummy_register_security (const char *name, struct security_operations *ops)
 858 {
 859         return -EINVAL;
 860 }
 861
 862 static int dummy_unregister_security (const char *name, struct security_operations *ops)
 863 {
 864         return -EINVAL;
 865 }
 866
 867 static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
 868 {
 869         return;
 870 }
 871
 872 static int dummy_getprocattr(struct task_struct *p, char *name, void *value, size_t size)
 873 {
 874         return -EINVAL;
 875 }
 876
 877 static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
 878 {
 879         return -EINVAL;
 880 }
 881
 882
 883 struct security_operations dummy_security_ops;
 884
 885 #define set_to_dummy_if_null(ops, function)                             \
 886         do {                                                            \
 887                 if (!ops->function) {                                   \
 888                         ops->function = dummy_##function;               \
 889                         pr_debug("Had to override the " #function       \
 890                                  " security operation with the dummy one.\n");\
 891                         }                                               \
 892         } while (0)
 893
 894 void security_fixup_ops (struct security_operations *ops)
 895 {
 896         set_to_dummy_if_null(ops, ptrace);
 897         set_to_dummy_if_null(ops, capget);
 898         set_to_dummy_if_null(ops, capset_check);
 899         set_to_dummy_if_null(ops, capset_set);
 900         set_to_dummy_if_null(ops, acct);
 901         set_to_dummy_if_null(ops, capable);
 902         set_to_dummy_if_null(ops, quotactl);
 903         set_to_dummy_if_null(ops, quota_on);
 904         set_to_dummy_if_null(ops, sysctl);
 905         set_to_dummy_if_null(ops, syslog);
 906         set_to_dummy_if_null(ops, settime);
 907         set_to_dummy_if_null(ops, vm_enough_memory);
 908         set_to_dummy_if_null(ops, bprm_alloc_security);
 909         set_to_dummy_if_null(ops, bprm_free_security);
 910         set_to_dummy_if_null(ops, bprm_apply_creds);
 911         set_to_dummy_if_null(ops, bprm_set_security);
 912         set_to_dummy_if_null(ops, bprm_check_security);
 913         set_to_dummy_if_null(ops, bprm_secureexec);
 914         set_to_dummy_if_null(ops, sb_alloc_security);
 915         set_to_dummy_if_null(ops, sb_free_security);
 916         set_to_dummy_if_null(ops, sb_copy_data);
 917         set_to_dummy_if_null(ops, sb_kern_mount);
 918         set_to_dummy_if_null(ops, sb_statfs);
 919         set_to_dummy_if_null(ops, sb_mount);
 920         set_to_dummy_if_null(ops, sb_check_sb);
 921         set_to_dummy_if_null(ops, sb_umount);
 922         set_to_dummy_if_null(ops, sb_umount_close);
 923         set_to_dummy_if_null(ops, sb_umount_busy);
 924         set_to_dummy_if_null(ops, sb_post_remount);
 925         set_to_dummy_if_null(ops, sb_post_mountroot);
 926         set_to_dummy_if_null(ops, sb_post_addmount);
 927         set_to_dummy_if_null(ops, sb_pivotroot);
 928         set_to_dummy_if_null(ops, sb_post_pivotroot);
 929         set_to_dummy_if_null(ops, inode_alloc_security);
 930         set_to_dummy_if_null(ops, inode_free_security);
 931         set_to_dummy_if_null(ops, inode_create);
 932         set_to_dummy_if_null(ops, inode_post_create);
 933         set_to_dummy_if_null(ops, inode_link);
 934         set_to_dummy_if_null(ops, inode_post_link);
 935         set_to_dummy_if_null(ops, inode_unlink);
 936         set_to_dummy_if_null(ops, inode_symlink);
 937         set_to_dummy_if_null(ops, inode_post_symlink);
 938         set_to_dummy_if_null(ops, inode_mkdir);
 939         set_to_dummy_if_null(ops, inode_post_mkdir);
 940         set_to_dummy_if_null(ops, inode_rmdir);
 941         set_to_dummy_if_null(ops, inode_mknod);
 942         set_to_dummy_if_null(ops, inode_post_mknod);
 943         set_to_dummy_if_null(ops, inode_rename);
 944         set_to_dummy_if_null(ops, inode_post_rename);
 945         set_to_dummy_if_null(ops, inode_readlink);
 946         set_to_dummy_if_null(ops, inode_follow_link);
 947         set_to_dummy_if_null(ops, inode_permission);
 948         set_to_dummy_if_null(ops, inode_setattr);
 949         set_to_dummy_if_null(ops, inode_getattr);
 950         set_to_dummy_if_null(ops, inode_delete);
 951         set_to_dummy_if_null(ops, inode_setxattr);
 952         set_to_dummy_if_null(ops, inode_post_setxattr);
 953         set_to_dummy_if_null(ops, inode_getxattr);
 954         set_to_dummy_if_null(ops, inode_listxattr);
 955         set_to_dummy_if_null(ops, inode_removexattr);
 956         set_to_dummy_if_null(ops, inode_getsecurity);
 957         set_to_dummy_if_null(ops, inode_setsecurity);
 958         set_to_dummy_if_null(ops, inode_listsecurity);
 959         set_to_dummy_if_null(ops, file_permission);
 960         set_to_dummy_if_null(ops, file_alloc_security);
 961         set_to_dummy_if_null(ops, file_free_security);
 962         set_to_dummy_if_null(ops, file_ioctl);
 963         set_to_dummy_if_null(ops, file_mmap);
 964         set_to_dummy_if_null(ops, file_mprotect);
 965         set_to_dummy_if_null(ops, file_lock);
 966         set_to_dummy_if_null(ops, file_fcntl);
 967         set_to_dummy_if_null(ops, file_set_fowner);
 968         set_to_dummy_if_null(ops, file_send_sigiotask);
 969         set_to_dummy_if_null(ops, file_receive);
 970         set_to_dummy_if_null(ops, task_create);
 971         set_to_dummy_if_null(ops, task_alloc_security);
 972         set_to_dummy_if_null(ops, task_free_security);
 973         set_to_dummy_if_null(ops, task_setuid);
 974         set_to_dummy_if_null(ops, task_post_setuid);
 975         set_to_dummy_if_null(ops, task_setgid);
 976         set_to_dummy_if_null(ops, task_setpgid);
 977         set_to_dummy_if_null(ops, task_getpgid);
 978         set_to_dummy_if_null(ops, task_getsid);
 979         set_to_dummy_if_null(ops, task_setgroups);
 980         set_to_dummy_if_null(ops, task_setnice);
 981         set_to_dummy_if_null(ops, task_setrlimit);
 982         set_to_dummy_if_null(ops, task_setscheduler);
 983         set_to_dummy_if_null(ops, task_getscheduler);
 984         set_to_dummy_if_null(ops, task_wait);
 985         set_to_dummy_if_null(ops, task_kill);
 986         set_to_dummy_if_null(ops, task_prctl);
 987         set_to_dummy_if_null(ops, task_reparent_to_init);
 988         set_to_dummy_if_null(ops, task_to_inode);
 989         set_to_dummy_if_null(ops, ipc_permission);
 990         set_to_dummy_if_null(ops, msg_msg_alloc_security);
 991         set_to_dummy_if_null(ops, msg_msg_free_security);
 992         set_to_dummy_if_null(ops, msg_queue_alloc_security);
 993         set_to_dummy_if_null(ops, msg_queue_free_security);
 994         set_to_dummy_if_null(ops, msg_queue_associate);
 995         set_to_dummy_if_null(ops, msg_queue_msgctl);
 996         set_to_dummy_if_null(ops, msg_queue_msgsnd);
 997         set_to_dummy_if_null(ops, msg_queue_msgrcv);
 998         set_to_dummy_if_null(ops, shm_alloc_security);
 999         set_to_dummy_if_null(ops, shm_free_security);
1000         set_to_dummy_if_null(ops, shm_associate);
1001         set_to_dummy_if_null(ops, shm_shmctl);
1002         set_to_dummy_if_null(ops, shm_shmat);
1003         set_to_dummy_if_null(ops, sem_alloc_security);
1004         set_to_dummy_if_null(ops, sem_free_security);
1005         set_to_dummy_if_null(ops, sem_associate);
1006         set_to_dummy_if_null(ops, sem_semctl);
1007         set_to_dummy_if_null(ops, sem_semop);
1008         set_to_dummy_if_null(ops, netlink_send);
1009         set_to_dummy_if_null(ops, netlink_recv);
1010         set_to_dummy_if_null(ops, register_security);
1011         set_to_dummy_if_null(ops, unregister_security);
1012         set_to_dummy_if_null(ops, d_instantiate);
1013         set_to_dummy_if_null(ops, getprocattr);
1014         set_to_dummy_if_null(ops, setprocattr);
1015 #ifdef CONFIG_SECURITY_NETWORK
1016         set_to_dummy_if_null(ops, unix_stream_connect);
1017         set_to_dummy_if_null(ops, unix_may_send);
1018         set_to_dummy_if_null(ops, socket_create);
1019         set_to_dummy_if_null(ops, socket_post_create);
1020         set_to_dummy_if_null(ops, socket_bind);
1021         set_to_dummy_if_null(ops, socket_connect);
1022         set_to_dummy_if_null(ops, socket_listen);
1023         set_to_dummy_if_null(ops, socket_accept);
1024         set_to_dummy_if_null(ops, socket_post_accept);
1025         set_to_dummy_if_null(ops, socket_sendmsg);
1026         set_to_dummy_if_null(ops, socket_recvmsg);
1027         set_to_dummy_if_null(ops, socket_getsockname);
1028         set_to_dummy_if_null(ops, socket_getpeername);
1029         set_to_dummy_if_null(ops, socket_setsockopt);
1030         set_to_dummy_if_null(ops, socket_getsockopt);
1031         set_to_dummy_if_null(ops, socket_shutdown);
1032         set_to_dummy_if_null(ops, socket_sock_rcv_skb);
1033         set_to_dummy_if_null(ops, socket_getpeersec);
1034         set_to_dummy_if_null(ops, sk_alloc_security);
1035         set_to_dummy_if_null(ops, sk_free_security);
1036 #endif  /* CONFIG_SECURITY_NETWORK */
1037 }
1038