security: Protection for exploiting null dereference using mmap
[linux-2.6.git] / security / dummy.c
1 /*
2  * Stub functions for the default security function pointers in case no
3  * security model is loaded.
4  *
5  * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
6  * Copyright (C) 2001-2002  Greg Kroah-Hartman <greg@kroah.com>
7  * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
8  *
9  *      This program is free software; you can redistribute it and/or modify
10  *      it under the terms of the GNU General Public License as published by
11  *      the Free Software Foundation; either version 2 of the License, or
12  *      (at your option) any later version.
13  */
14
15 #undef DEBUG
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/mman.h>
21 #include <linux/pagemap.h>
22 #include <linux/swap.h>
23 #include <linux/security.h>
24 #include <linux/skbuff.h>
25 #include <linux/netlink.h>
26 #include <net/sock.h>
27 #include <linux/xattr.h>
28 #include <linux/hugetlb.h>
29 #include <linux/ptrace.h>
30 #include <linux/file.h>
31
32 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
33 {
34         return 0;
35 }
36
37 static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
38                          kernel_cap_t * inheritable, kernel_cap_t * permitted)
39 {
40         *effective = *inheritable = *permitted = 0;
41         if (!issecure(SECURE_NOROOT)) {
42                 if (target->euid == 0) {
43                         *permitted |= (~0 & ~CAP_FS_MASK);
44                         *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
45                 }
46                 if (target->fsuid == 0) {
47                         *permitted |= CAP_FS_MASK;
48                         *effective |= CAP_FS_MASK;
49                 }
50         }
51         return 0;
52 }
53
54 static int dummy_capset_check (struct task_struct *target,
55                                kernel_cap_t * effective,
56                                kernel_cap_t * inheritable,
57                                kernel_cap_t * permitted)
58 {
59         return -EPERM;
60 }
61
62 static void dummy_capset_set (struct task_struct *target,
63                               kernel_cap_t * effective,
64                               kernel_cap_t * inheritable,
65                               kernel_cap_t * permitted)
66 {
67         return;
68 }
69
70 static int dummy_acct (struct file *file)
71 {
72         return 0;
73 }
74
75 static int dummy_capable (struct task_struct *tsk, int cap)
76 {
77         if (cap_raised (tsk->cap_effective, cap))
78                 return 0;
79         return -EPERM;
80 }
81
82 static int dummy_sysctl (ctl_table * table, int op)
83 {
84         return 0;
85 }
86
87 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
88 {
89         return 0;
90 }
91
92 static int dummy_quota_on (struct dentry *dentry)
93 {
94         return 0;
95 }
96
97 static int dummy_syslog (int type)
98 {
99         if ((type != 3 && type != 10) && current->euid)
100                 return -EPERM;
101         return 0;
102 }
103
104 static int dummy_settime(struct timespec *ts, struct timezone *tz)
105 {
106         if (!capable(CAP_SYS_TIME))
107                 return -EPERM;
108         return 0;
109 }
110
111 static int dummy_vm_enough_memory(long pages)
112 {
113         int cap_sys_admin = 0;
114
115         if (dummy_capable(current, CAP_SYS_ADMIN) == 0)
116                 cap_sys_admin = 1;
117         return __vm_enough_memory(pages, cap_sys_admin);
118 }
119
120 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
121 {
122         return 0;
123 }
124
125 static void dummy_bprm_free_security (struct linux_binprm *bprm)
126 {
127         return;
128 }
129
130 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
131 {
132         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
133                 current->mm->dumpable = suid_dumpable;
134
135                 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
136                         bprm->e_uid = current->uid;
137                         bprm->e_gid = current->gid;
138                 }
139         }
140
141         current->suid = current->euid = current->fsuid = bprm->e_uid;
142         current->sgid = current->egid = current->fsgid = bprm->e_gid;
143
144         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
145 }
146
147 static void dummy_bprm_post_apply_creds (struct linux_binprm *bprm)
148 {
149         return;
150 }
151
152 static int dummy_bprm_set_security (struct linux_binprm *bprm)
153 {
154         return 0;
155 }
156
157 static int dummy_bprm_check_security (struct linux_binprm *bprm)
158 {
159         return 0;
160 }
161
162 static int dummy_bprm_secureexec (struct linux_binprm *bprm)
163 {
164         /* The new userland will simply use the value provided
165            in the AT_SECURE field to decide whether secure mode
166            is required.  Hence, this logic is required to preserve
167            the legacy decision algorithm used by the old userland. */
168         return (current->euid != current->uid ||
169                 current->egid != current->gid);
170 }
171
172 static int dummy_sb_alloc_security (struct super_block *sb)
173 {
174         return 0;
175 }
176
177 static void dummy_sb_free_security (struct super_block *sb)
178 {
179         return;
180 }
181
182 static int dummy_sb_copy_data (struct file_system_type *type,
183                                void *orig, void *copy)
184 {
185         return 0;
186 }
187
188 static int dummy_sb_kern_mount (struct super_block *sb, void *data)
189 {
190         return 0;
191 }
192
193 static int dummy_sb_statfs (struct dentry *dentry)
194 {
195         return 0;
196 }
197
198 static int dummy_sb_mount (char *dev_name, struct nameidata *nd, char *type,
199                            unsigned long flags, void *data)
200 {
201         return 0;
202 }
203
204 static int dummy_sb_check_sb (struct vfsmount *mnt, struct nameidata *nd)
205 {
206         return 0;
207 }
208
209 static int dummy_sb_umount (struct vfsmount *mnt, int flags)
210 {
211         return 0;
212 }
213
214 static void dummy_sb_umount_close (struct vfsmount *mnt)
215 {
216         return;
217 }
218
219 static void dummy_sb_umount_busy (struct vfsmount *mnt)
220 {
221         return;
222 }
223
224 static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
225                                    void *data)
226 {
227         return;
228 }
229
230
231 static void dummy_sb_post_mountroot (void)
232 {
233         return;
234 }
235
236 static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
237 {
238         return;
239 }
240
241 static int dummy_sb_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
242 {
243         return 0;
244 }
245
246 static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
247 {
248         return;
249 }
250
251 static int dummy_inode_alloc_security (struct inode *inode)
252 {
253         return 0;
254 }
255
256 static void dummy_inode_free_security (struct inode *inode)
257 {
258         return;
259 }
260
261 static int dummy_inode_init_security (struct inode *inode, struct inode *dir,
262                                       char **name, void **value, size_t *len)
263 {
264         return -EOPNOTSUPP;
265 }
266
267 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
268                                int mask)
269 {
270         return 0;
271 }
272
273 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
274                              struct dentry *new_dentry)
275 {
276         return 0;
277 }
278
279 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
280 {
281         return 0;
282 }
283
284 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
285                                 const char *name)
286 {
287         return 0;
288 }
289
290 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
291                               int mask)
292 {
293         return 0;
294 }
295
296 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
297 {
298         return 0;
299 }
300
301 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
302                               int mode, dev_t dev)
303 {
304         return 0;
305 }
306
307 static int dummy_inode_rename (struct inode *old_inode,
308                                struct dentry *old_dentry,
309                                struct inode *new_inode,
310                                struct dentry *new_dentry)
311 {
312         return 0;
313 }
314
315 static int dummy_inode_readlink (struct dentry *dentry)
316 {
317         return 0;
318 }
319
320 static int dummy_inode_follow_link (struct dentry *dentry,
321                                     struct nameidata *nameidata)
322 {
323         return 0;
324 }
325
326 static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
327 {
328         return 0;
329 }
330
331 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
332 {
333         return 0;
334 }
335
336 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
337 {
338         return 0;
339 }
340
341 static void dummy_inode_delete (struct inode *ino)
342 {
343         return;
344 }
345
346 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
347                                 size_t size, int flags)
348 {
349         if (!strncmp(name, XATTR_SECURITY_PREFIX,
350                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
351             !capable(CAP_SYS_ADMIN))
352                 return -EPERM;
353         return 0;
354 }
355
356 static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
357                                        size_t size, int flags)
358 {
359 }
360
361 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
362 {
363         return 0;
364 }
365
366 static int dummy_inode_listxattr (struct dentry *dentry)
367 {
368         return 0;
369 }
370
371 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
372 {
373         if (!strncmp(name, XATTR_SECURITY_PREFIX,
374                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
375             !capable(CAP_SYS_ADMIN))
376                 return -EPERM;
377         return 0;
378 }
379
380 static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
381 {
382         return -EOPNOTSUPP;
383 }
384
385 static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
386 {
387         return -EOPNOTSUPP;
388 }
389
390 static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
391 {
392         return 0;
393 }
394
395 static const char *dummy_inode_xattr_getsuffix(void)
396 {
397         return NULL;
398 }
399
400 static int dummy_file_permission (struct file *file, int mask)
401 {
402         return 0;
403 }
404
405 static int dummy_file_alloc_security (struct file *file)
406 {
407         return 0;
408 }
409
410 static void dummy_file_free_security (struct file *file)
411 {
412         return;
413 }
414
415 static int dummy_file_ioctl (struct file *file, unsigned int command,
416                              unsigned long arg)
417 {
418         return 0;
419 }
420
421 static int dummy_file_mmap (struct file *file, unsigned long reqprot,
422                             unsigned long prot,
423                             unsigned long flags,
424                             unsigned long addr,
425                             unsigned long addr_only)
426 {
427         if (addr < mmap_min_addr)
428                 return -EACCES;
429         return 0;
430 }
431
432 static int dummy_file_mprotect (struct vm_area_struct *vma,
433                                 unsigned long reqprot,
434                                 unsigned long prot)
435 {
436         return 0;
437 }
438
439 static int dummy_file_lock (struct file *file, unsigned int cmd)
440 {
441         return 0;
442 }
443
444 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
445                              unsigned long arg)
446 {
447         return 0;
448 }
449
450 static int dummy_file_set_fowner (struct file *file)
451 {
452         return 0;
453 }
454
455 static int dummy_file_send_sigiotask (struct task_struct *tsk,
456                                       struct fown_struct *fown, int sig)
457 {
458         return 0;
459 }
460
461 static int dummy_file_receive (struct file *file)
462 {
463         return 0;
464 }
465
466 static int dummy_task_create (unsigned long clone_flags)
467 {
468         return 0;
469 }
470
471 static int dummy_task_alloc_security (struct task_struct *p)
472 {
473         return 0;
474 }
475
476 static void dummy_task_free_security (struct task_struct *p)
477 {
478         return;
479 }
480
481 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
482 {
483         return 0;
484 }
485
486 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
487 {
488         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
489         return 0;
490 }
491
492 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
493 {
494         return 0;
495 }
496
497 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
498 {
499         return 0;
500 }
501
502 static int dummy_task_getpgid (struct task_struct *p)
503 {
504         return 0;
505 }
506
507 static int dummy_task_getsid (struct task_struct *p)
508 {
509         return 0;
510 }
511
512 static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
513 { }
514
515 static int dummy_task_setgroups (struct group_info *group_info)
516 {
517         return 0;
518 }
519
520 static int dummy_task_setnice (struct task_struct *p, int nice)
521 {
522         return 0;
523 }
524
525 static int dummy_task_setioprio (struct task_struct *p, int ioprio)
526 {
527         return 0;
528 }
529
530 static int dummy_task_getioprio (struct task_struct *p)
531 {
532         return 0;
533 }
534
535 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
536 {
537         return 0;
538 }
539
540 static int dummy_task_setscheduler (struct task_struct *p, int policy,
541                                     struct sched_param *lp)
542 {
543         return 0;
544 }
545
546 static int dummy_task_getscheduler (struct task_struct *p)
547 {
548         return 0;
549 }
550
551 static int dummy_task_movememory (struct task_struct *p)
552 {
553         return 0;
554 }
555
556 static int dummy_task_wait (struct task_struct *p)
557 {
558         return 0;
559 }
560
561 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
562                             int sig, u32 secid)
563 {
564         return 0;
565 }
566
567 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
568                              unsigned long arg4, unsigned long arg5)
569 {
570         return 0;
571 }
572
573 static void dummy_task_reparent_to_init (struct task_struct *p)
574 {
575         p->euid = p->fsuid = 0;
576         return;
577 }
578
579 static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
580 { }
581
582 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
583 {
584         return 0;
585 }
586
587 static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
588 {
589         return 0;
590 }
591
592 static void dummy_msg_msg_free_security (struct msg_msg *msg)
593 {
594         return;
595 }
596
597 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
598 {
599         return 0;
600 }
601
602 static void dummy_msg_queue_free_security (struct msg_queue *msq)
603 {
604         return;
605 }
606
607 static int dummy_msg_queue_associate (struct msg_queue *msq, 
608                                       int msqflg)
609 {
610         return 0;
611 }
612
613 static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
614 {
615         return 0;
616 }
617
618 static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
619                                    int msgflg)
620 {
621         return 0;
622 }
623
624 static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
625                                    struct task_struct *target, long type,
626                                    int mode)
627 {
628         return 0;
629 }
630
631 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
632 {
633         return 0;
634 }
635
636 static void dummy_shm_free_security (struct shmid_kernel *shp)
637 {
638         return;
639 }
640
641 static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
642 {
643         return 0;
644 }
645
646 static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
647 {
648         return 0;
649 }
650
651 static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
652                             int shmflg)
653 {
654         return 0;
655 }
656
657 static int dummy_sem_alloc_security (struct sem_array *sma)
658 {
659         return 0;
660 }
661
662 static void dummy_sem_free_security (struct sem_array *sma)
663 {
664         return;
665 }
666
667 static int dummy_sem_associate (struct sem_array *sma, int semflg)
668 {
669         return 0;
670 }
671
672 static int dummy_sem_semctl (struct sem_array *sma, int cmd)
673 {
674         return 0;
675 }
676
677 static int dummy_sem_semop (struct sem_array *sma, 
678                             struct sembuf *sops, unsigned nsops, int alter)
679 {
680         return 0;
681 }
682
683 static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
684 {
685         NETLINK_CB(skb).eff_cap = current->cap_effective;
686         return 0;
687 }
688
689 static int dummy_netlink_recv (struct sk_buff *skb, int cap)
690 {
691         if (!cap_raised (NETLINK_CB (skb).eff_cap, cap))
692                 return -EPERM;
693         return 0;
694 }
695
696 #ifdef CONFIG_SECURITY_NETWORK
697 static int dummy_unix_stream_connect (struct socket *sock,
698                                       struct socket *other,
699                                       struct sock *newsk)
700 {
701         return 0;
702 }
703
704 static int dummy_unix_may_send (struct socket *sock,
705                                 struct socket *other)
706 {
707         return 0;
708 }
709
710 static int dummy_socket_create (int family, int type,
711                                 int protocol, int kern)
712 {
713         return 0;
714 }
715
716 static int dummy_socket_post_create (struct socket *sock, int family, int type,
717                                      int protocol, int kern)
718 {
719         return 0;
720 }
721
722 static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
723                               int addrlen)
724 {
725         return 0;
726 }
727
728 static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
729                                  int addrlen)
730 {
731         return 0;
732 }
733
734 static int dummy_socket_listen (struct socket *sock, int backlog)
735 {
736         return 0;
737 }
738
739 static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
740 {
741         return 0;
742 }
743
744 static void dummy_socket_post_accept (struct socket *sock, 
745                                       struct socket *newsock)
746 {
747         return;
748 }
749
750 static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
751                                  int size)
752 {
753         return 0;
754 }
755
756 static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
757                                  int size, int flags)
758 {
759         return 0;
760 }
761
762 static int dummy_socket_getsockname (struct socket *sock)
763 {
764         return 0;
765 }
766
767 static int dummy_socket_getpeername (struct socket *sock)
768 {
769         return 0;
770 }
771
772 static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
773 {
774         return 0;
775 }
776
777 static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
778 {
779         return 0;
780 }
781
782 static int dummy_socket_shutdown (struct socket *sock, int how)
783 {
784         return 0;
785 }
786
787 static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
788 {
789         return 0;
790 }
791
792 static int dummy_socket_getpeersec_stream(struct socket *sock, char __user *optval,
793                                           int __user *optlen, unsigned len)
794 {
795         return -ENOPROTOOPT;
796 }
797
798 static int dummy_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
799 {
800         return -ENOPROTOOPT;
801 }
802
803 static inline int dummy_sk_alloc_security (struct sock *sk, int family, gfp_t priority)
804 {
805         return 0;
806 }
807
808 static inline void dummy_sk_free_security (struct sock *sk)
809 {
810 }
811
812 static inline void dummy_sk_clone_security (const struct sock *sk, struct sock *newsk)
813 {
814 }
815
816 static inline void dummy_sk_getsecid(struct sock *sk, u32 *secid)
817 {
818 }
819
820 static inline void dummy_sock_graft(struct sock* sk, struct socket *parent)
821 {
822 }
823
824 static inline int dummy_inet_conn_request(struct sock *sk,
825                         struct sk_buff *skb, struct request_sock *req)
826 {
827         return 0;
828 }
829
830 static inline void dummy_inet_csk_clone(struct sock *newsk,
831                         const struct request_sock *req)
832 {
833 }
834
835 static inline void dummy_inet_conn_established(struct sock *sk,
836                         struct sk_buff *skb)
837 {
838 }
839
840 static inline void dummy_req_classify_flow(const struct request_sock *req,
841                         struct flowi *fl)
842 {
843 }
844 #endif  /* CONFIG_SECURITY_NETWORK */
845
846 #ifdef CONFIG_SECURITY_NETWORK_XFRM
847 static int dummy_xfrm_policy_alloc_security(struct xfrm_policy *xp,
848                 struct xfrm_user_sec_ctx *sec_ctx)
849 {
850         return 0;
851 }
852
853 static inline int dummy_xfrm_policy_clone_security(struct xfrm_policy *old, struct xfrm_policy *new)
854 {
855         return 0;
856 }
857
858 static void dummy_xfrm_policy_free_security(struct xfrm_policy *xp)
859 {
860 }
861
862 static int dummy_xfrm_policy_delete_security(struct xfrm_policy *xp)
863 {
864         return 0;
865 }
866
867 static int dummy_xfrm_state_alloc_security(struct xfrm_state *x,
868         struct xfrm_user_sec_ctx *sec_ctx, u32 secid)
869 {
870         return 0;
871 }
872
873 static void dummy_xfrm_state_free_security(struct xfrm_state *x)
874 {
875 }
876
877 static int dummy_xfrm_state_delete_security(struct xfrm_state *x)
878 {
879         return 0;
880 }
881
882 static int dummy_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
883 {
884         return 0;
885 }
886
887 static int dummy_xfrm_state_pol_flow_match(struct xfrm_state *x,
888                                 struct xfrm_policy *xp, struct flowi *fl)
889 {
890         return 1;
891 }
892
893 static int dummy_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall)
894 {
895         return 0;
896 }
897
898 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
899 static int dummy_register_security (const char *name, struct security_operations *ops)
900 {
901         return -EINVAL;
902 }
903
904 static int dummy_unregister_security (const char *name, struct security_operations *ops)
905 {
906         return -EINVAL;
907 }
908
909 static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
910 {
911         return;
912 }
913
914 static int dummy_getprocattr(struct task_struct *p, char *name, char **value)
915 {
916         return -EINVAL;
917 }
918
919 static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
920 {
921         return -EINVAL;
922 }
923
924 static int dummy_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
925 {
926         return -EOPNOTSUPP;
927 }
928
929 static void dummy_release_secctx(char *secdata, u32 seclen)
930 {
931 }
932
933 #ifdef CONFIG_KEYS
934 static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
935                                   unsigned long flags)
936 {
937         return 0;
938 }
939
940 static inline void dummy_key_free(struct key *key)
941 {
942 }
943
944 static inline int dummy_key_permission(key_ref_t key_ref,
945                                        struct task_struct *context,
946                                        key_perm_t perm)
947 {
948         return 0;
949 }
950 #endif /* CONFIG_KEYS */
951
952 struct security_operations dummy_security_ops;
953
954 #define set_to_dummy_if_null(ops, function)                             \
955         do {                                                            \
956                 if (!ops->function) {                                   \
957                         ops->function = dummy_##function;               \
958                         pr_debug("Had to override the " #function       \
959                                  " security operation with the dummy one.\n");\
960                         }                                               \
961         } while (0)
962
963 void security_fixup_ops (struct security_operations *ops)
964 {
965         set_to_dummy_if_null(ops, ptrace);
966         set_to_dummy_if_null(ops, capget);
967         set_to_dummy_if_null(ops, capset_check);
968         set_to_dummy_if_null(ops, capset_set);
969         set_to_dummy_if_null(ops, acct);
970         set_to_dummy_if_null(ops, capable);
971         set_to_dummy_if_null(ops, quotactl);
972         set_to_dummy_if_null(ops, quota_on);
973         set_to_dummy_if_null(ops, sysctl);
974         set_to_dummy_if_null(ops, syslog);
975         set_to_dummy_if_null(ops, settime);
976         set_to_dummy_if_null(ops, vm_enough_memory);
977         set_to_dummy_if_null(ops, bprm_alloc_security);
978         set_to_dummy_if_null(ops, bprm_free_security);
979         set_to_dummy_if_null(ops, bprm_apply_creds);
980         set_to_dummy_if_null(ops, bprm_post_apply_creds);
981         set_to_dummy_if_null(ops, bprm_set_security);
982         set_to_dummy_if_null(ops, bprm_check_security);
983         set_to_dummy_if_null(ops, bprm_secureexec);
984         set_to_dummy_if_null(ops, sb_alloc_security);
985         set_to_dummy_if_null(ops, sb_free_security);
986         set_to_dummy_if_null(ops, sb_copy_data);
987         set_to_dummy_if_null(ops, sb_kern_mount);
988         set_to_dummy_if_null(ops, sb_statfs);
989         set_to_dummy_if_null(ops, sb_mount);
990         set_to_dummy_if_null(ops, sb_check_sb);
991         set_to_dummy_if_null(ops, sb_umount);
992         set_to_dummy_if_null(ops, sb_umount_close);
993         set_to_dummy_if_null(ops, sb_umount_busy);
994         set_to_dummy_if_null(ops, sb_post_remount);
995         set_to_dummy_if_null(ops, sb_post_mountroot);
996         set_to_dummy_if_null(ops, sb_post_addmount);
997         set_to_dummy_if_null(ops, sb_pivotroot);
998         set_to_dummy_if_null(ops, sb_post_pivotroot);
999         set_to_dummy_if_null(ops, inode_alloc_security);
1000         set_to_dummy_if_null(ops, inode_free_security);
1001         set_to_dummy_if_null(ops, inode_init_security);
1002         set_to_dummy_if_null(ops, inode_create);
1003         set_to_dummy_if_null(ops, inode_link);
1004         set_to_dummy_if_null(ops, inode_unlink);
1005         set_to_dummy_if_null(ops, inode_symlink);
1006         set_to_dummy_if_null(ops, inode_mkdir);
1007         set_to_dummy_if_null(ops, inode_rmdir);
1008         set_to_dummy_if_null(ops, inode_mknod);
1009         set_to_dummy_if_null(ops, inode_rename);
1010         set_to_dummy_if_null(ops, inode_readlink);
1011         set_to_dummy_if_null(ops, inode_follow_link);
1012         set_to_dummy_if_null(ops, inode_permission);
1013         set_to_dummy_if_null(ops, inode_setattr);
1014         set_to_dummy_if_null(ops, inode_getattr);
1015         set_to_dummy_if_null(ops, inode_delete);
1016         set_to_dummy_if_null(ops, inode_setxattr);
1017         set_to_dummy_if_null(ops, inode_post_setxattr);
1018         set_to_dummy_if_null(ops, inode_getxattr);
1019         set_to_dummy_if_null(ops, inode_listxattr);
1020         set_to_dummy_if_null(ops, inode_removexattr);
1021         set_to_dummy_if_null(ops, inode_xattr_getsuffix);
1022         set_to_dummy_if_null(ops, inode_getsecurity);
1023         set_to_dummy_if_null(ops, inode_setsecurity);
1024         set_to_dummy_if_null(ops, inode_listsecurity);
1025         set_to_dummy_if_null(ops, file_permission);
1026         set_to_dummy_if_null(ops, file_alloc_security);
1027         set_to_dummy_if_null(ops, file_free_security);
1028         set_to_dummy_if_null(ops, file_ioctl);
1029         set_to_dummy_if_null(ops, file_mmap);
1030         set_to_dummy_if_null(ops, file_mprotect);
1031         set_to_dummy_if_null(ops, file_lock);
1032         set_to_dummy_if_null(ops, file_fcntl);
1033         set_to_dummy_if_null(ops, file_set_fowner);
1034         set_to_dummy_if_null(ops, file_send_sigiotask);
1035         set_to_dummy_if_null(ops, file_receive);
1036         set_to_dummy_if_null(ops, task_create);
1037         set_to_dummy_if_null(ops, task_alloc_security);
1038         set_to_dummy_if_null(ops, task_free_security);
1039         set_to_dummy_if_null(ops, task_setuid);
1040         set_to_dummy_if_null(ops, task_post_setuid);
1041         set_to_dummy_if_null(ops, task_setgid);
1042         set_to_dummy_if_null(ops, task_setpgid);
1043         set_to_dummy_if_null(ops, task_getpgid);
1044         set_to_dummy_if_null(ops, task_getsid);
1045         set_to_dummy_if_null(ops, task_getsecid);
1046         set_to_dummy_if_null(ops, task_setgroups);
1047         set_to_dummy_if_null(ops, task_setnice);
1048         set_to_dummy_if_null(ops, task_setioprio);
1049         set_to_dummy_if_null(ops, task_getioprio);
1050         set_to_dummy_if_null(ops, task_setrlimit);
1051         set_to_dummy_if_null(ops, task_setscheduler);
1052         set_to_dummy_if_null(ops, task_getscheduler);
1053         set_to_dummy_if_null(ops, task_movememory);
1054         set_to_dummy_if_null(ops, task_wait);
1055         set_to_dummy_if_null(ops, task_kill);
1056         set_to_dummy_if_null(ops, task_prctl);
1057         set_to_dummy_if_null(ops, task_reparent_to_init);
1058         set_to_dummy_if_null(ops, task_to_inode);
1059         set_to_dummy_if_null(ops, ipc_permission);
1060         set_to_dummy_if_null(ops, msg_msg_alloc_security);
1061         set_to_dummy_if_null(ops, msg_msg_free_security);
1062         set_to_dummy_if_null(ops, msg_queue_alloc_security);
1063         set_to_dummy_if_null(ops, msg_queue_free_security);
1064         set_to_dummy_if_null(ops, msg_queue_associate);
1065         set_to_dummy_if_null(ops, msg_queue_msgctl);
1066         set_to_dummy_if_null(ops, msg_queue_msgsnd);
1067         set_to_dummy_if_null(ops, msg_queue_msgrcv);
1068         set_to_dummy_if_null(ops, shm_alloc_security);
1069         set_to_dummy_if_null(ops, shm_free_security);
1070         set_to_dummy_if_null(ops, shm_associate);
1071         set_to_dummy_if_null(ops, shm_shmctl);
1072         set_to_dummy_if_null(ops, shm_shmat);
1073         set_to_dummy_if_null(ops, sem_alloc_security);
1074         set_to_dummy_if_null(ops, sem_free_security);
1075         set_to_dummy_if_null(ops, sem_associate);
1076         set_to_dummy_if_null(ops, sem_semctl);
1077         set_to_dummy_if_null(ops, sem_semop);
1078         set_to_dummy_if_null(ops, netlink_send);
1079         set_to_dummy_if_null(ops, netlink_recv);
1080         set_to_dummy_if_null(ops, register_security);
1081         set_to_dummy_if_null(ops, unregister_security);
1082         set_to_dummy_if_null(ops, d_instantiate);
1083         set_to_dummy_if_null(ops, getprocattr);
1084         set_to_dummy_if_null(ops, setprocattr);
1085         set_to_dummy_if_null(ops, secid_to_secctx);
1086         set_to_dummy_if_null(ops, release_secctx);
1087 #ifdef CONFIG_SECURITY_NETWORK
1088         set_to_dummy_if_null(ops, unix_stream_connect);
1089         set_to_dummy_if_null(ops, unix_may_send);
1090         set_to_dummy_if_null(ops, socket_create);
1091         set_to_dummy_if_null(ops, socket_post_create);
1092         set_to_dummy_if_null(ops, socket_bind);
1093         set_to_dummy_if_null(ops, socket_connect);
1094         set_to_dummy_if_null(ops, socket_listen);
1095         set_to_dummy_if_null(ops, socket_accept);
1096         set_to_dummy_if_null(ops, socket_post_accept);
1097         set_to_dummy_if_null(ops, socket_sendmsg);
1098         set_to_dummy_if_null(ops, socket_recvmsg);
1099         set_to_dummy_if_null(ops, socket_getsockname);
1100         set_to_dummy_if_null(ops, socket_getpeername);
1101         set_to_dummy_if_null(ops, socket_setsockopt);
1102         set_to_dummy_if_null(ops, socket_getsockopt);
1103         set_to_dummy_if_null(ops, socket_shutdown);
1104         set_to_dummy_if_null(ops, socket_sock_rcv_skb);
1105         set_to_dummy_if_null(ops, socket_getpeersec_stream);
1106         set_to_dummy_if_null(ops, socket_getpeersec_dgram);
1107         set_to_dummy_if_null(ops, sk_alloc_security);
1108         set_to_dummy_if_null(ops, sk_free_security);
1109         set_to_dummy_if_null(ops, sk_clone_security);
1110         set_to_dummy_if_null(ops, sk_getsecid);
1111         set_to_dummy_if_null(ops, sock_graft);
1112         set_to_dummy_if_null(ops, inet_conn_request);
1113         set_to_dummy_if_null(ops, inet_csk_clone);
1114         set_to_dummy_if_null(ops, inet_conn_established);
1115         set_to_dummy_if_null(ops, req_classify_flow);
1116  #endif /* CONFIG_SECURITY_NETWORK */
1117 #ifdef  CONFIG_SECURITY_NETWORK_XFRM
1118         set_to_dummy_if_null(ops, xfrm_policy_alloc_security);
1119         set_to_dummy_if_null(ops, xfrm_policy_clone_security);
1120         set_to_dummy_if_null(ops, xfrm_policy_free_security);
1121         set_to_dummy_if_null(ops, xfrm_policy_delete_security);
1122         set_to_dummy_if_null(ops, xfrm_state_alloc_security);
1123         set_to_dummy_if_null(ops, xfrm_state_free_security);
1124         set_to_dummy_if_null(ops, xfrm_state_delete_security);
1125         set_to_dummy_if_null(ops, xfrm_policy_lookup);
1126         set_to_dummy_if_null(ops, xfrm_state_pol_flow_match);
1127         set_to_dummy_if_null(ops, xfrm_decode_session);
1128 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1129 #ifdef CONFIG_KEYS
1130         set_to_dummy_if_null(ops, key_alloc);
1131         set_to_dummy_if_null(ops, key_free);
1132         set_to_dummy_if_null(ops, key_permission);
1133 #endif  /* CONFIG_KEYS */
1134
1135 }
1136