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