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/kernel.h>
  19 #include <linux/mman.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/swap.h>
  22 #include <linux/security.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/netlink.h>
  25 #include <net/sock.h>
  26 #include <linux/xattr.h>
  27 #include <linux/hugetlb.h>
  28 #include <linux/ptrace.h>
  29 #include <linux/file.h>
  30
  31 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
  32 {
  33         return 0;
  34 }
  35
  36 static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
  37                          kernel_cap_t * inheritable, kernel_cap_t * permitted)
  38 {
  39         if (target->euid == 0) {
  40                 cap_set_full(*permitted);
  41                 cap_set_init_eff(*effective);
  42         } else {
  43                 cap_clear(*permitted);
  44                 cap_clear(*effective);
  45         }
  46
  47         cap_clear(*inheritable);
  48
  49         if (target->fsuid != 0) {
  50                 *permitted = cap_drop_fs_set(*permitted);
  51                 *effective = cap_drop_fs_set(*effective);
  52         }
  53         return 0;
  54 }
  55
  56 static int dummy_capset_check (struct task_struct *target,
  57                                kernel_cap_t * effective,
  58                                kernel_cap_t * inheritable,
  59                                kernel_cap_t * permitted)
  60 {
  61         return -EPERM;
  62 }
  63
  64 static void dummy_capset_set (struct task_struct *target,
  65                               kernel_cap_t * effective,
  66                               kernel_cap_t * inheritable,
  67                               kernel_cap_t * permitted)
  68 {
  69         return;
  70 }
  71
  72 static int dummy_acct (struct file *file)
  73 {
  74         return 0;
  75 }
  76
  77 static int dummy_capable (struct task_struct *tsk, int cap)
  78 {
  79         if (cap_raised (tsk->cap_effective, cap))
  80                 return 0;
  81         return -EPERM;
  82 }
  83
  84 static int dummy_sysctl (ctl_table * table, int op)
  85 {
  86         return 0;
  87 }
  88
  89 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
  90 {
  91         return 0;
  92 }
  93
  94 static int dummy_quota_on (struct dentry *dentry)
  95 {
  96         return 0;
  97 }
  98
  99 static int dummy_syslog (int type)
 100 {
 101         if ((type != 3 && type != 10) && current->euid)
 102                 return -EPERM;
 103         return 0;
 104 }
 105
 106 static int dummy_settime(struct timespec *ts, struct timezone *tz)
 107 {
 108         if (!capable(CAP_SYS_TIME))
 109                 return -EPERM;
 110         return 0;
 111 }
 112
 113 static int dummy_vm_enough_memory(struct mm_struct *mm, long pages)
 114 {
 115         int cap_sys_admin = 0;
 116
 117         if (dummy_capable(current, CAP_SYS_ADMIN) == 0)
 118                 cap_sys_admin = 1;
 119         return __vm_enough_memory(mm, pages, cap_sys_admin);
 120 }
 121
 122 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
 123 {
 124         return 0;
 125 }
 126
 127 static void dummy_bprm_free_security (struct linux_binprm *bprm)
 128 {
 129         return;
 130 }
 131
 132 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
 133 {
 134         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
 135                 set_dumpable(current->mm, suid_dumpable);
 136
 137                 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
 138                         bprm->e_uid = current->uid;
 139                         bprm->e_gid = current->gid;
 140                 }
 141         }
 142
 143         current->suid = current->euid = current->fsuid = bprm->e_uid;
 144         current->sgid = current->egid = current->fsgid = bprm->e_gid;
 145
 146         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
 147 }
 148
 149 static void dummy_bprm_post_apply_creds (struct linux_binprm *bprm)
 150 {
 151         return;
 152 }
 153
 154 static int dummy_bprm_set_security (struct linux_binprm *bprm)
 155 {
 156         return 0;
 157 }
 158
 159 static int dummy_bprm_check_security (struct linux_binprm *bprm)
 160 {
 161         return 0;
 162 }
 163
 164 static int dummy_bprm_secureexec (struct linux_binprm *bprm)
 165 {
 166         /* The new userland will simply use the value provided
 167            in the AT_SECURE field to decide whether secure mode
 168            is required.  Hence, this logic is required to preserve
 169            the legacy decision algorithm used by the old userland. */
 170         return (current->euid != current->uid ||
 171                 current->egid != current->gid);
 172 }
 173
 174 static int dummy_sb_alloc_security (struct super_block *sb)
 175 {
 176         return 0;
 177 }
 178
 179 static void dummy_sb_free_security (struct super_block *sb)
 180 {
 181         return;
 182 }
 183
 184 static int dummy_sb_copy_data (char *orig, char *copy)
 185 {
 186         return 0;
 187 }
 188
 189 static int dummy_sb_kern_mount (struct super_block *sb, void *data)
 190 {
 191         return 0;
 192 }
 193
 194 static int dummy_sb_statfs (struct dentry *dentry)
 195 {
 196         return 0;
 197 }
 198
 199 static int dummy_sb_mount (char *dev_name, struct path *path, char *type,
 200                            unsigned long flags, void *data)
 201 {
 202         return 0;
 203 }
 204
 205 static int dummy_sb_check_sb (struct vfsmount *mnt, struct path *path)
 206 {
 207         return 0;
 208 }
 209
 210 static int dummy_sb_umount (struct vfsmount *mnt, int flags)
 211 {
 212         return 0;
 213 }
 214
 215 static void dummy_sb_umount_close (struct vfsmount *mnt)
 216 {
 217         return;
 218 }
 219
 220 static void dummy_sb_umount_busy (struct vfsmount *mnt)
 221 {
 222         return;
 223 }
 224
 225 static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
 226                                    void *data)
 227 {
 228         return;
 229 }
 230
 231
 232 static void dummy_sb_post_addmount (struct vfsmount *mnt, struct path *path)
 233 {
 234         return;
 235 }
 236
 237 static int dummy_sb_pivotroot (struct path *old_path, struct path *new_path)
 238 {
 239         return 0;
 240 }
 241
 242 static void dummy_sb_post_pivotroot (struct path *old_path, struct path *new_path)
 243 {
 244         return;
 245 }
 246
 247 static int dummy_sb_get_mnt_opts(const struct super_block *sb,
 248                                  struct security_mnt_opts *opts)
 249 {
 250         security_init_mnt_opts(opts);
 251         return 0;
 252 }
 253
 254 static int dummy_sb_set_mnt_opts(struct super_block *sb,
 255                                  struct security_mnt_opts *opts)
 256 {
 257         if (unlikely(opts->num_mnt_opts))
 258                 return -EOPNOTSUPP;
 259         return 0;
 260 }
 261
 262 static void dummy_sb_clone_mnt_opts(const struct super_block *oldsb,
 263                                     struct super_block *newsb)
 264 {
 265         return;
 266 }
 267
 268 static int dummy_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
 269 {
 270         return 0;
 271 }
 272
 273 static int dummy_inode_alloc_security (struct inode *inode)
 274 {
 275         return 0;
 276 }
 277
 278 static void dummy_inode_free_security (struct inode *inode)
 279 {
 280         return;
 281 }
 282
 283 static int dummy_inode_init_security (struct inode *inode, struct inode *dir,
 284                                       char **name, void **value, size_t *len)
 285 {
 286         return -EOPNOTSUPP;
 287 }
 288
 289 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
 290                                int mask)
 291 {
 292         return 0;
 293 }
 294
 295 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
 296                              struct dentry *new_dentry)
 297 {
 298         return 0;
 299 }
 300
 301 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
 302 {
 303         return 0;
 304 }
 305
 306 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
 307                                 const char *name)
 308 {
 309         return 0;
 310 }
 311
 312 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
 313                               int mask)
 314 {
 315         return 0;
 316 }
 317
 318 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
 319 {
 320         return 0;
 321 }
 322
 323 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
 324                               int mode, dev_t dev)
 325 {
 326         return 0;
 327 }
 328
 329 static int dummy_inode_rename (struct inode *old_inode,
 330                                struct dentry *old_dentry,
 331                                struct inode *new_inode,
 332                                struct dentry *new_dentry)
 333 {
 334         return 0;
 335 }
 336
 337 static int dummy_inode_readlink (struct dentry *dentry)
 338 {
 339         return 0;
 340 }
 341
 342 static int dummy_inode_follow_link (struct dentry *dentry,
 343                                     struct nameidata *nameidata)
 344 {
 345         return 0;
 346 }
 347
 348 static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
 349 {
 350         return 0;
 351 }
 352
 353 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
 354 {
 355         return 0;
 356 }
 357
 358 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
 359 {
 360         return 0;
 361 }
 362
 363 static void dummy_inode_delete (struct inode *ino)
 364 {
 365         return;
 366 }
 367
 368 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
 369                                 size_t size, int flags)
 370 {
 371         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 372                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 373             !capable(CAP_SYS_ADMIN))
 374                 return -EPERM;
 375         return 0;
 376 }
 377
 378 static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
 379                                        size_t size, int flags)
 380 {
 381 }
 382
 383 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
 384 {
 385         return 0;
 386 }
 387
 388 static int dummy_inode_listxattr (struct dentry *dentry)
 389 {
 390         return 0;
 391 }
 392
 393 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
 394 {
 395         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 396                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 397             !capable(CAP_SYS_ADMIN))
 398                 return -EPERM;
 399         return 0;
 400 }
 401
 402 static int dummy_inode_need_killpriv(struct dentry *dentry)
 403 {
 404         return 0;
 405 }
 406
 407 static int dummy_inode_killpriv(struct dentry *dentry)
 408 {
 409         return 0;
 410 }
 411
 412 static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
 413 {
 414         return -EOPNOTSUPP;
 415 }
 416
 417 static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
 418 {
 419         return -EOPNOTSUPP;
 420 }
 421
 422 static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
 423 {
 424         return 0;
 425 }
 426
 427 static void dummy_inode_getsecid(const struct inode *inode, u32 *secid)
 428 {
 429         *secid = 0;
 430 }
 431
 432 static int dummy_file_permission (struct file *file, int mask)
 433 {
 434         return 0;
 435 }
 436
 437 static int dummy_file_alloc_security (struct file *file)
 438 {
 439         return 0;
 440 }
 441
 442 static void dummy_file_free_security (struct file *file)
 443 {
 444         return;
 445 }
 446
 447 static int dummy_file_ioctl (struct file *file, unsigned int command,
 448                              unsigned long arg)
 449 {
 450         return 0;
 451 }
 452
 453 static int dummy_file_mmap (struct file *file, unsigned long reqprot,
 454                             unsigned long prot,
 455                             unsigned long flags,
 456                             unsigned long addr,
 457                             unsigned long addr_only)
 458 {
 459         if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO))
 460                 return -EACCES;
 461         return 0;
 462 }
 463
 464 static int dummy_file_mprotect (struct vm_area_struct *vma,
 465                                 unsigned long reqprot,
 466                                 unsigned long prot)
 467 {
 468         return 0;
 469 }
 470
 471 static int dummy_file_lock (struct file *file, unsigned int cmd)
 472 {
 473         return 0;
 474 }
 475
 476 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
 477                              unsigned long arg)
 478 {
 479         return 0;
 480 }
 481
 482 static int dummy_file_set_fowner (struct file *file)
 483 {
 484         return 0;
 485 }
 486
 487 static int dummy_file_send_sigiotask (struct task_struct *tsk,
 488                                       struct fown_struct *fown, int sig)
 489 {
 490         return 0;
 491 }
 492
 493 static int dummy_file_receive (struct file *file)
 494 {
 495         return 0;
 496 }
 497
 498 static int dummy_dentry_open (struct file *file)
 499 {
 500         return 0;
 501 }
 502
 503 static int dummy_task_create (unsigned long clone_flags)
 504 {
 505         return 0;
 506 }
 507
 508 static int dummy_task_alloc_security (struct task_struct *p)
 509 {
 510         return 0;
 511 }
 512
 513 static void dummy_task_free_security (struct task_struct *p)
 514 {
 515         return;
 516 }
 517
 518 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 519 {
 520         return 0;
 521 }
 522
 523 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 524 {
 525         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
 526         return 0;
 527 }
 528
 529 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
 530 {
 531         return 0;
 532 }
 533
 534 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
 535 {
 536         return 0;
 537 }
 538
 539 static int dummy_task_getpgid (struct task_struct *p)
 540 {
 541         return 0;
 542 }
 543
 544 static int dummy_task_getsid (struct task_struct *p)
 545 {
 546         return 0;
 547 }
 548
 549 static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
 550 {
 551         *secid = 0;
 552 }
 553
 554 static int dummy_task_setgroups (struct group_info *group_info)
 555 {
 556         return 0;
 557 }
 558
 559 static int dummy_task_setnice (struct task_struct *p, int nice)
 560 {
 561         return 0;
 562 }
 563
 564 static int dummy_task_setioprio (struct task_struct *p, int ioprio)
 565 {
 566         return 0;
 567 }
 568
 569 static int dummy_task_getioprio (struct task_struct *p)
 570 {
 571         return 0;
 572 }
 573
 574 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
 575 {
 576         return 0;
 577 }
 578
 579 static int dummy_task_setscheduler (struct task_struct *p, int policy,
 580                                     struct sched_param *lp)
 581 {
 582         return 0;
 583 }
 584
 585 static int dummy_task_getscheduler (struct task_struct *p)
 586 {
 587         return 0;
 588 }
 589
 590 static int dummy_task_movememory (struct task_struct *p)
 591 {
 592         return 0;
 593 }
 594
 595 static int dummy_task_wait (struct task_struct *p)
 596 {
 597         return 0;
 598 }
 599
 600 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
 601                             int sig, u32 secid)
 602 {
 603         return 0;
 604 }
 605
 606 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
 607                              unsigned long arg4, unsigned long arg5)
 608 {
 609         return 0;
 610 }
 611
 612 static void dummy_task_reparent_to_init (struct task_struct *p)
 613 {
 614         p->euid = p->fsuid = 0;
 615         return;
 616 }
 617
 618 static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
 619 { }
 620
 621 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
 622 {
 623         return 0;
 624 }
 625
 626 static void dummy_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
 627 {
 628         *secid = 0;
 629 }
 630
 631 static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
 632 {
 633         return 0;
 634 }
 635
 636 static void dummy_msg_msg_free_security (struct msg_msg *msg)
 637 {
 638         return;
 639 }
 640
 641 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
 642 {
 643         return 0;
 644 }
 645
 646 static void dummy_msg_queue_free_security (struct msg_queue *msq)
 647 {
 648         return;
 649 }
 650
 651 static int dummy_msg_queue_associate (struct msg_queue *msq,
 652                                       int msqflg)
 653 {
 654         return 0;
 655 }
 656
 657 static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
 658 {
 659         return 0;
 660 }
 661
 662 static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
 663                                    int msgflg)
 664 {
 665         return 0;
 666 }
 667
 668 static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
 669                                    struct task_struct *target, long type,
 670                                    int mode)
 671 {
 672         return 0;
 673 }
 674
 675 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
 676 {
 677         return 0;
 678 }
 679
 680 static void dummy_shm_free_security (struct shmid_kernel *shp)
 681 {
 682         return;
 683 }
 684
 685 static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
 686 {
 687         return 0;
 688 }
 689
 690 static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
 691 {
 692         return 0;
 693 }
 694
 695 static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
 696                             int shmflg)
 697 {
 698         return 0;
 699 }
 700
 701 static int dummy_sem_alloc_security (struct sem_array *sma)
 702 {
 703         return 0;
 704 }
 705
 706 static void dummy_sem_free_security (struct sem_array *sma)
 707 {
 708         return;
 709 }
 710
 711 static int dummy_sem_associate (struct sem_array *sma, int semflg)
 712 {
 713         return 0;
 714 }
 715
 716 static int dummy_sem_semctl (struct sem_array *sma, int cmd)
 717 {
 718         return 0;
 719 }
 720
 721 static int dummy_sem_semop (struct sem_array *sma,
 722                             struct sembuf *sops, unsigned nsops, int alter)
 723 {
 724         return 0;
 725 }
 726
 727 static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
 728 {
 729         NETLINK_CB(skb).eff_cap = current->cap_effective;
 730         return 0;
 731 }
 732
 733 static int dummy_netlink_recv (struct sk_buff *skb, int cap)
 734 {
 735         if (!cap_raised (NETLINK_CB (skb).eff_cap, cap))
 736                 return -EPERM;
 737         return 0;
 738 }
 739
 740 #ifdef CONFIG_SECURITY_NETWORK
 741 static int dummy_unix_stream_connect (struct socket *sock,
 742                                       struct socket *other,
 743                                       struct sock *newsk)
 744 {
 745         return 0;
 746 }
 747
 748 static int dummy_unix_may_send (struct socket *sock,
 749                                 struct socket *other)
 750 {
 751         return 0;
 752 }
 753
 754 static int dummy_socket_create (int family, int type,
 755                                 int protocol, int kern)
 756 {
 757         return 0;
 758 }
 759
 760 static int dummy_socket_post_create (struct socket *sock, int family, int type,
 761                                      int protocol, int kern)
 762 {
 763         return 0;
 764 }
 765
 766 static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
 767                               int addrlen)
 768 {
 769         return 0;
 770 }
 771
 772 static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
 773                                  int addrlen)
 774 {
 775         return 0;
 776 }
 777
 778 static int dummy_socket_listen (struct socket *sock, int backlog)
 779 {
 780         return 0;
 781 }
 782
 783 static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
 784 {
 785         return 0;
 786 }
 787
 788 static void dummy_socket_post_accept (struct socket *sock,
 789                                       struct socket *newsock)
 790 {
 791         return;
 792 }
 793
 794 static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
 795                                  int size)
 796 {
 797         return 0;
 798 }
 799
 800 static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
 801                                  int size, int flags)
 802 {
 803         return 0;
 804 }
 805
 806 static int dummy_socket_getsockname (struct socket *sock)
 807 {
 808         return 0;
 809 }
 810
 811 static int dummy_socket_getpeername (struct socket *sock)
 812 {
 813         return 0;
 814 }
 815
 816 static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
 817 {
 818         return 0;
 819 }
 820
 821 static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
 822 {
 823         return 0;
 824 }
 825
 826 static int dummy_socket_shutdown (struct socket *sock, int how)
 827 {
 828         return 0;
 829 }
 830
 831 static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
 832 {
 833         return 0;
 834 }
 835
 836 static int dummy_socket_getpeersec_stream(struct socket *sock, char __user *optval,
 837                                           int __user *optlen, unsigned len)
 838 {
 839         return -ENOPROTOOPT;
 840 }
 841
 842 static int dummy_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
 843 {
 844         return -ENOPROTOOPT;
 845 }
 846
 847 static inline int dummy_sk_alloc_security (struct sock *sk, int family, gfp_t priority)
 848 {
 849         return 0;
 850 }
 851
 852 static inline void dummy_sk_free_security (struct sock *sk)
 853 {
 854 }
 855
 856 static inline void dummy_sk_clone_security (const struct sock *sk, struct sock *newsk)
 857 {
 858 }
 859
 860 static inline void dummy_sk_getsecid(struct sock *sk, u32 *secid)
 861 {
 862 }
 863
 864 static inline void dummy_sock_graft(struct sock* sk, struct socket *parent)
 865 {
 866 }
 867
 868 static inline int dummy_inet_conn_request(struct sock *sk,
 869                         struct sk_buff *skb, struct request_sock *req)
 870 {
 871         return 0;
 872 }
 873
 874 static inline void dummy_inet_csk_clone(struct sock *newsk,
 875                         const struct request_sock *req)
 876 {
 877 }
 878
 879 static inline void dummy_inet_conn_established(struct sock *sk,
 880                         struct sk_buff *skb)
 881 {
 882 }
 883
 884 static inline void dummy_req_classify_flow(const struct request_sock *req,
 885                         struct flowi *fl)
 886 {
 887 }
 888 #endif  /* CONFIG_SECURITY_NETWORK */
 889
 890 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 891 static int dummy_xfrm_policy_alloc_security(struct xfrm_sec_ctx **ctxp,
 892                                             struct xfrm_user_sec_ctx *sec_ctx)
 893 {
 894         return 0;
 895 }
 896
 897 static inline int dummy_xfrm_policy_clone_security(struct xfrm_sec_ctx *old_ctx,
 898                                            struct xfrm_sec_ctx **new_ctxp)
 899 {
 900         return 0;
 901 }
 902
 903 static void dummy_xfrm_policy_free_security(struct xfrm_sec_ctx *ctx)
 904 {
 905 }
 906
 907 static int dummy_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx)
 908 {
 909         return 0;
 910 }
 911
 912 static int dummy_xfrm_state_alloc_security(struct xfrm_state *x,
 913         struct xfrm_user_sec_ctx *sec_ctx, u32 secid)
 914 {
 915         return 0;
 916 }
 917
 918 static void dummy_xfrm_state_free_security(struct xfrm_state *x)
 919 {
 920 }
 921
 922 static int dummy_xfrm_state_delete_security(struct xfrm_state *x)
 923 {
 924         return 0;
 925 }
 926
 927 static int dummy_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx,
 928                                     u32 sk_sid, u8 dir)
 929 {
 930         return 0;
 931 }
 932
 933 static int dummy_xfrm_state_pol_flow_match(struct xfrm_state *x,
 934                                 struct xfrm_policy *xp, struct flowi *fl)
 935 {
 936         return 1;
 937 }
 938
 939 static int dummy_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall)
 940 {
 941         return 0;
 942 }
 943
 944 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
 945 static int dummy_register_security (const char *name, struct security_operations *ops)
 946 {
 947         return -EINVAL;
 948 }
 949
 950 static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
 951 {
 952         return;
 953 }
 954
 955 static int dummy_getprocattr(struct task_struct *p, char *name, char **value)
 956 {
 957         return -EINVAL;
 958 }
 959
 960 static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
 961 {
 962         return -EINVAL;
 963 }
 964
 965 static int dummy_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 966 {
 967         return -EOPNOTSUPP;
 968 }
 969
 970 static int dummy_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
 971 {
 972         return -EOPNOTSUPP;
 973 }
 974
 975 static void dummy_release_secctx(char *secdata, u32 seclen)
 976 {
 977 }
 978
 979 #ifdef CONFIG_KEYS
 980 static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
 981                                   unsigned long flags)
 982 {
 983         return 0;
 984 }
 985
 986 static inline void dummy_key_free(struct key *key)
 987 {
 988 }
 989
 990 static inline int dummy_key_permission(key_ref_t key_ref,
 991                                        struct task_struct *context,
 992                                        key_perm_t perm)
 993 {
 994         return 0;
 995 }
 996 #endif /* CONFIG_KEYS */
 997
 998 #ifdef CONFIG_AUDIT
 999 static inline int dummy_audit_rule_init(u32 field, u32 op, char *rulestr,
1000                                         void **lsmrule)
1001 {
1002         return 0;
1003 }
1004
1005 static inline int dummy_audit_rule_known(struct audit_krule *krule)
1006 {
1007         return 0;
1008 }
1009
1010 static inline int dummy_audit_rule_match(u32 secid, u32 field, u32 op,
1011                                          void *lsmrule,
1012                                          struct audit_context *actx)
1013 {
1014         return 0;
1015 }
1016
1017 static inline void dummy_audit_rule_free(void *lsmrule)
1018 { }
1019
1020 #endif /* CONFIG_AUDIT */
1021
1022 struct security_operations dummy_security_ops = {
1023         .name = "dummy",
1024 };
1025
1026 #define set_to_dummy_if_null(ops, function)                             \
1027         do {                                                            \
1028                 if (!ops->function) {                                   \
1029                         ops->function = dummy_##function;               \
1030                         pr_debug("Had to override the " #function       \
1031                                  " security operation with the dummy one.\n");\
1032                         }                                               \
1033         } while (0)
1034
1035 void security_fixup_ops (struct security_operations *ops)
1036 {
1037         set_to_dummy_if_null(ops, ptrace);
1038         set_to_dummy_if_null(ops, capget);
1039         set_to_dummy_if_null(ops, capset_check);
1040         set_to_dummy_if_null(ops, capset_set);
1041         set_to_dummy_if_null(ops, acct);
1042         set_to_dummy_if_null(ops, capable);
1043         set_to_dummy_if_null(ops, quotactl);
1044         set_to_dummy_if_null(ops, quota_on);
1045         set_to_dummy_if_null(ops, sysctl);
1046         set_to_dummy_if_null(ops, syslog);
1047         set_to_dummy_if_null(ops, settime);
1048         set_to_dummy_if_null(ops, vm_enough_memory);
1049         set_to_dummy_if_null(ops, bprm_alloc_security);
1050         set_to_dummy_if_null(ops, bprm_free_security);
1051         set_to_dummy_if_null(ops, bprm_apply_creds);
1052         set_to_dummy_if_null(ops, bprm_post_apply_creds);
1053         set_to_dummy_if_null(ops, bprm_set_security);
1054         set_to_dummy_if_null(ops, bprm_check_security);
1055         set_to_dummy_if_null(ops, bprm_secureexec);
1056         set_to_dummy_if_null(ops, sb_alloc_security);
1057         set_to_dummy_if_null(ops, sb_free_security);
1058         set_to_dummy_if_null(ops, sb_copy_data);
1059         set_to_dummy_if_null(ops, sb_kern_mount);
1060         set_to_dummy_if_null(ops, sb_statfs);
1061         set_to_dummy_if_null(ops, sb_mount);
1062         set_to_dummy_if_null(ops, sb_check_sb);
1063         set_to_dummy_if_null(ops, sb_umount);
1064         set_to_dummy_if_null(ops, sb_umount_close);
1065         set_to_dummy_if_null(ops, sb_umount_busy);
1066         set_to_dummy_if_null(ops, sb_post_remount);
1067         set_to_dummy_if_null(ops, sb_post_addmount);
1068         set_to_dummy_if_null(ops, sb_pivotroot);
1069         set_to_dummy_if_null(ops, sb_post_pivotroot);
1070         set_to_dummy_if_null(ops, sb_get_mnt_opts);
1071         set_to_dummy_if_null(ops, sb_set_mnt_opts);
1072         set_to_dummy_if_null(ops, sb_clone_mnt_opts);
1073         set_to_dummy_if_null(ops, sb_parse_opts_str);
1074         set_to_dummy_if_null(ops, inode_alloc_security);
1075         set_to_dummy_if_null(ops, inode_free_security);
1076         set_to_dummy_if_null(ops, inode_init_security);
1077         set_to_dummy_if_null(ops, inode_create);
1078         set_to_dummy_if_null(ops, inode_link);
1079         set_to_dummy_if_null(ops, inode_unlink);
1080         set_to_dummy_if_null(ops, inode_symlink);
1081         set_to_dummy_if_null(ops, inode_mkdir);
1082         set_to_dummy_if_null(ops, inode_rmdir);
1083         set_to_dummy_if_null(ops, inode_mknod);
1084         set_to_dummy_if_null(ops, inode_rename);
1085         set_to_dummy_if_null(ops, inode_readlink);
1086         set_to_dummy_if_null(ops, inode_follow_link);
1087         set_to_dummy_if_null(ops, inode_permission);
1088         set_to_dummy_if_null(ops, inode_setattr);
1089         set_to_dummy_if_null(ops, inode_getattr);
1090         set_to_dummy_if_null(ops, inode_delete);
1091         set_to_dummy_if_null(ops, inode_setxattr);
1092         set_to_dummy_if_null(ops, inode_post_setxattr);
1093         set_to_dummy_if_null(ops, inode_getxattr);
1094         set_to_dummy_if_null(ops, inode_listxattr);
1095         set_to_dummy_if_null(ops, inode_removexattr);
1096         set_to_dummy_if_null(ops, inode_need_killpriv);
1097         set_to_dummy_if_null(ops, inode_killpriv);
1098         set_to_dummy_if_null(ops, inode_getsecurity);
1099         set_to_dummy_if_null(ops, inode_setsecurity);
1100         set_to_dummy_if_null(ops, inode_listsecurity);
1101         set_to_dummy_if_null(ops, inode_getsecid);
1102         set_to_dummy_if_null(ops, file_permission);
1103         set_to_dummy_if_null(ops, file_alloc_security);
1104         set_to_dummy_if_null(ops, file_free_security);
1105         set_to_dummy_if_null(ops, file_ioctl);
1106         set_to_dummy_if_null(ops, file_mmap);
1107         set_to_dummy_if_null(ops, file_mprotect);
1108         set_to_dummy_if_null(ops, file_lock);
1109         set_to_dummy_if_null(ops, file_fcntl);
1110         set_to_dummy_if_null(ops, file_set_fowner);
1111         set_to_dummy_if_null(ops, file_send_sigiotask);
1112         set_to_dummy_if_null(ops, file_receive);
1113         set_to_dummy_if_null(ops, dentry_open);
1114         set_to_dummy_if_null(ops, task_create);
1115         set_to_dummy_if_null(ops, task_alloc_security);
1116         set_to_dummy_if_null(ops, task_free_security);
1117         set_to_dummy_if_null(ops, task_setuid);
1118         set_to_dummy_if_null(ops, task_post_setuid);
1119         set_to_dummy_if_null(ops, task_setgid);
1120         set_to_dummy_if_null(ops, task_setpgid);
1121         set_to_dummy_if_null(ops, task_getpgid);
1122         set_to_dummy_if_null(ops, task_getsid);
1123         set_to_dummy_if_null(ops, task_getsecid);
1124         set_to_dummy_if_null(ops, task_setgroups);
1125         set_to_dummy_if_null(ops, task_setnice);
1126         set_to_dummy_if_null(ops, task_setioprio);
1127         set_to_dummy_if_null(ops, task_getioprio);
1128         set_to_dummy_if_null(ops, task_setrlimit);
1129         set_to_dummy_if_null(ops, task_setscheduler);
1130         set_to_dummy_if_null(ops, task_getscheduler);
1131         set_to_dummy_if_null(ops, task_movememory);
1132         set_to_dummy_if_null(ops, task_wait);
1133         set_to_dummy_if_null(ops, task_kill);
1134         set_to_dummy_if_null(ops, task_prctl);
1135         set_to_dummy_if_null(ops, task_reparent_to_init);
1136         set_to_dummy_if_null(ops, task_to_inode);
1137         set_to_dummy_if_null(ops, ipc_permission);
1138         set_to_dummy_if_null(ops, ipc_getsecid);
1139         set_to_dummy_if_null(ops, msg_msg_alloc_security);
1140         set_to_dummy_if_null(ops, msg_msg_free_security);
1141         set_to_dummy_if_null(ops, msg_queue_alloc_security);
1142         set_to_dummy_if_null(ops, msg_queue_free_security);
1143         set_to_dummy_if_null(ops, msg_queue_associate);
1144         set_to_dummy_if_null(ops, msg_queue_msgctl);
1145         set_to_dummy_if_null(ops, msg_queue_msgsnd);
1146         set_to_dummy_if_null(ops, msg_queue_msgrcv);
1147         set_to_dummy_if_null(ops, shm_alloc_security);
1148         set_to_dummy_if_null(ops, shm_free_security);
1149         set_to_dummy_if_null(ops, shm_associate);
1150         set_to_dummy_if_null(ops, shm_shmctl);
1151         set_to_dummy_if_null(ops, shm_shmat);
1152         set_to_dummy_if_null(ops, sem_alloc_security);
1153         set_to_dummy_if_null(ops, sem_free_security);
1154         set_to_dummy_if_null(ops, sem_associate);
1155         set_to_dummy_if_null(ops, sem_semctl);
1156         set_to_dummy_if_null(ops, sem_semop);
1157         set_to_dummy_if_null(ops, netlink_send);
1158         set_to_dummy_if_null(ops, netlink_recv);
1159         set_to_dummy_if_null(ops, register_security);
1160         set_to_dummy_if_null(ops, d_instantiate);
1161         set_to_dummy_if_null(ops, getprocattr);
1162         set_to_dummy_if_null(ops, setprocattr);
1163         set_to_dummy_if_null(ops, secid_to_secctx);
1164         set_to_dummy_if_null(ops, secctx_to_secid);
1165         set_to_dummy_if_null(ops, release_secctx);
1166 #ifdef CONFIG_SECURITY_NETWORK
1167         set_to_dummy_if_null(ops, unix_stream_connect);
1168         set_to_dummy_if_null(ops, unix_may_send);
1169         set_to_dummy_if_null(ops, socket_create);
1170         set_to_dummy_if_null(ops, socket_post_create);
1171         set_to_dummy_if_null(ops, socket_bind);
1172         set_to_dummy_if_null(ops, socket_connect);
1173         set_to_dummy_if_null(ops, socket_listen);
1174         set_to_dummy_if_null(ops, socket_accept);
1175         set_to_dummy_if_null(ops, socket_post_accept);
1176         set_to_dummy_if_null(ops, socket_sendmsg);
1177         set_to_dummy_if_null(ops, socket_recvmsg);
1178         set_to_dummy_if_null(ops, socket_getsockname);
1179         set_to_dummy_if_null(ops, socket_getpeername);
1180         set_to_dummy_if_null(ops, socket_setsockopt);
1181         set_to_dummy_if_null(ops, socket_getsockopt);
1182         set_to_dummy_if_null(ops, socket_shutdown);
1183         set_to_dummy_if_null(ops, socket_sock_rcv_skb);
1184         set_to_dummy_if_null(ops, socket_getpeersec_stream);
1185         set_to_dummy_if_null(ops, socket_getpeersec_dgram);
1186         set_to_dummy_if_null(ops, sk_alloc_security);
1187         set_to_dummy_if_null(ops, sk_free_security);
1188         set_to_dummy_if_null(ops, sk_clone_security);
1189         set_to_dummy_if_null(ops, sk_getsecid);
1190         set_to_dummy_if_null(ops, sock_graft);
1191         set_to_dummy_if_null(ops, inet_conn_request);
1192         set_to_dummy_if_null(ops, inet_csk_clone);
1193         set_to_dummy_if_null(ops, inet_conn_established);
1194         set_to_dummy_if_null(ops, req_classify_flow);
1195  #endif /* CONFIG_SECURITY_NETWORK */
1196 #ifdef  CONFIG_SECURITY_NETWORK_XFRM
1197         set_to_dummy_if_null(ops, xfrm_policy_alloc_security);
1198         set_to_dummy_if_null(ops, xfrm_policy_clone_security);
1199         set_to_dummy_if_null(ops, xfrm_policy_free_security);
1200         set_to_dummy_if_null(ops, xfrm_policy_delete_security);
1201         set_to_dummy_if_null(ops, xfrm_state_alloc_security);
1202         set_to_dummy_if_null(ops, xfrm_state_free_security);
1203         set_to_dummy_if_null(ops, xfrm_state_delete_security);
1204         set_to_dummy_if_null(ops, xfrm_policy_lookup);
1205         set_to_dummy_if_null(ops, xfrm_state_pol_flow_match);
1206         set_to_dummy_if_null(ops, xfrm_decode_session);
1207 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1208 #ifdef CONFIG_KEYS
1209         set_to_dummy_if_null(ops, key_alloc);
1210         set_to_dummy_if_null(ops, key_free);
1211         set_to_dummy_if_null(ops, key_permission);
1212 #endif  /* CONFIG_KEYS */
1213 #ifdef CONFIG_AUDIT
1214         set_to_dummy_if_null(ops, audit_rule_init);
1215         set_to_dummy_if_null(ops, audit_rule_known);
1216         set_to_dummy_if_null(ops, audit_rule_match);
1217         set_to_dummy_if_null(ops, audit_rule_free);
1218 #endif
1219 }
1220