[PATCH] SELinux: cleanup stray variable in selinux_inode_init_security()
[linux-3.10.git] / security / selinux / hooks.c
1 /*
2  *  NSA Security-Enhanced Linux (SELinux) security module
3  *
4  *  This file contains the SELinux hook function implementations.
5  *
6  *  Authors:  Stephen Smalley, <sds@epoch.ncsc.mil>
7  *            Chris Vance, <cvance@nai.com>
8  *            Wayne Salamon, <wsalamon@nai.com>
9  *            James Morris <jmorris@redhat.com>
10  *
11  *  Copyright (C) 2001,2002 Networks Associates Technology, Inc.
12  *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
13  *  Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
14  *                          <dgoeddel@trustedcs.com>
15  *
16  *      This program is free software; you can redistribute it and/or modify
17  *      it under the terms of the GNU General Public License version 2,
18  *      as published by the Free Software Foundation.
19  */
20
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/ptrace.h>
26 #include <linux/errno.h>
27 #include <linux/sched.h>
28 #include <linux/security.h>
29 #include <linux/xattr.h>
30 #include <linux/capability.h>
31 #include <linux/unistd.h>
32 #include <linux/mm.h>
33 #include <linux/mman.h>
34 #include <linux/slab.h>
35 #include <linux/pagemap.h>
36 #include <linux/swap.h>
37 #include <linux/smp_lock.h>
38 #include <linux/spinlock.h>
39 #include <linux/syscalls.h>
40 #include <linux/file.h>
41 #include <linux/namei.h>
42 #include <linux/mount.h>
43 #include <linux/ext2_fs.h>
44 #include <linux/proc_fs.h>
45 #include <linux/kd.h>
46 #include <linux/netfilter_ipv4.h>
47 #include <linux/netfilter_ipv6.h>
48 #include <linux/tty.h>
49 #include <net/icmp.h>
50 #include <net/ip.h>             /* for sysctl_local_port_range[] */
51 #include <net/tcp.h>            /* struct or_callable used in sock_rcv_skb */
52 #include <asm/uaccess.h>
53 #include <asm/semaphore.h>
54 #include <asm/ioctls.h>
55 #include <linux/bitops.h>
56 #include <linux/interrupt.h>
57 #include <linux/netdevice.h>    /* for network interface checks */
58 #include <linux/netlink.h>
59 #include <linux/tcp.h>
60 #include <linux/udp.h>
61 #include <linux/quota.h>
62 #include <linux/un.h>           /* for Unix socket types */
63 #include <net/af_unix.h>        /* for Unix socket types */
64 #include <linux/parser.h>
65 #include <linux/nfs_mount.h>
66 #include <net/ipv6.h>
67 #include <linux/hugetlb.h>
68 #include <linux/personality.h>
69 #include <linux/sysctl.h>
70 #include <linux/audit.h>
71 #include <linux/string.h>
72
73 #include "avc.h"
74 #include "objsec.h"
75 #include "netif.h"
76 #include "xfrm.h"
77
78 #define XATTR_SELINUX_SUFFIX "selinux"
79 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
80
81 extern unsigned int policydb_loaded_version;
82 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
83
84 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
85 int selinux_enforcing = 0;
86
87 static int __init enforcing_setup(char *str)
88 {
89         selinux_enforcing = simple_strtol(str,NULL,0);
90         return 1;
91 }
92 __setup("enforcing=", enforcing_setup);
93 #endif
94
95 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
96 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
97
98 static int __init selinux_enabled_setup(char *str)
99 {
100         selinux_enabled = simple_strtol(str, NULL, 0);
101         return 1;
102 }
103 __setup("selinux=", selinux_enabled_setup);
104 #endif
105
106 /* Original (dummy) security module. */
107 static struct security_operations *original_ops = NULL;
108
109 /* Minimal support for a secondary security module,
110    just to allow the use of the dummy or capability modules.
111    The owlsm module can alternatively be used as a secondary
112    module as long as CONFIG_OWLSM_FD is not enabled. */
113 static struct security_operations *secondary_ops = NULL;
114
115 /* Lists of inode and superblock security structures initialized
116    before the policy was loaded. */
117 static LIST_HEAD(superblock_security_head);
118 static DEFINE_SPINLOCK(sb_security_lock);
119
120 /* Allocate and free functions for each kind of security blob. */
121
122 static int task_alloc_security(struct task_struct *task)
123 {
124         struct task_security_struct *tsec;
125
126         tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
127         if (!tsec)
128                 return -ENOMEM;
129
130         tsec->task = task;
131         tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
132         task->security = tsec;
133
134         return 0;
135 }
136
137 static void task_free_security(struct task_struct *task)
138 {
139         struct task_security_struct *tsec = task->security;
140         task->security = NULL;
141         kfree(tsec);
142 }
143
144 static int inode_alloc_security(struct inode *inode)
145 {
146         struct task_security_struct *tsec = current->security;
147         struct inode_security_struct *isec;
148
149         isec = kzalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
150         if (!isec)
151                 return -ENOMEM;
152
153         init_MUTEX(&isec->sem);
154         INIT_LIST_HEAD(&isec->list);
155         isec->inode = inode;
156         isec->sid = SECINITSID_UNLABELED;
157         isec->sclass = SECCLASS_FILE;
158         isec->task_sid = tsec->sid;
159         inode->i_security = isec;
160
161         return 0;
162 }
163
164 static void inode_free_security(struct inode *inode)
165 {
166         struct inode_security_struct *isec = inode->i_security;
167         struct superblock_security_struct *sbsec = inode->i_sb->s_security;
168
169         spin_lock(&sbsec->isec_lock);
170         if (!list_empty(&isec->list))
171                 list_del_init(&isec->list);
172         spin_unlock(&sbsec->isec_lock);
173
174         inode->i_security = NULL;
175         kfree(isec);
176 }
177
178 static int file_alloc_security(struct file *file)
179 {
180         struct task_security_struct *tsec = current->security;
181         struct file_security_struct *fsec;
182
183         fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
184         if (!fsec)
185                 return -ENOMEM;
186
187         fsec->file = file;
188         fsec->sid = tsec->sid;
189         fsec->fown_sid = tsec->sid;
190         file->f_security = fsec;
191
192         return 0;
193 }
194
195 static void file_free_security(struct file *file)
196 {
197         struct file_security_struct *fsec = file->f_security;
198         file->f_security = NULL;
199         kfree(fsec);
200 }
201
202 static int superblock_alloc_security(struct super_block *sb)
203 {
204         struct superblock_security_struct *sbsec;
205
206         sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
207         if (!sbsec)
208                 return -ENOMEM;
209
210         init_MUTEX(&sbsec->sem);
211         INIT_LIST_HEAD(&sbsec->list);
212         INIT_LIST_HEAD(&sbsec->isec_head);
213         spin_lock_init(&sbsec->isec_lock);
214         sbsec->sb = sb;
215         sbsec->sid = SECINITSID_UNLABELED;
216         sbsec->def_sid = SECINITSID_FILE;
217         sb->s_security = sbsec;
218
219         return 0;
220 }
221
222 static void superblock_free_security(struct super_block *sb)
223 {
224         struct superblock_security_struct *sbsec = sb->s_security;
225
226         spin_lock(&sb_security_lock);
227         if (!list_empty(&sbsec->list))
228                 list_del_init(&sbsec->list);
229         spin_unlock(&sb_security_lock);
230
231         sb->s_security = NULL;
232         kfree(sbsec);
233 }
234
235 static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
236 {
237         struct sk_security_struct *ssec;
238
239         if (family != PF_UNIX)
240                 return 0;
241
242         ssec = kzalloc(sizeof(*ssec), priority);
243         if (!ssec)
244                 return -ENOMEM;
245
246         ssec->sk = sk;
247         ssec->peer_sid = SECINITSID_UNLABELED;
248         sk->sk_security = ssec;
249
250         return 0;
251 }
252
253 static void sk_free_security(struct sock *sk)
254 {
255         struct sk_security_struct *ssec = sk->sk_security;
256
257         if (sk->sk_family != PF_UNIX)
258                 return;
259
260         sk->sk_security = NULL;
261         kfree(ssec);
262 }
263
264 /* The security server must be initialized before
265    any labeling or access decisions can be provided. */
266 extern int ss_initialized;
267
268 /* The file system's label must be initialized prior to use. */
269
270 static char *labeling_behaviors[6] = {
271         "uses xattr",
272         "uses transition SIDs",
273         "uses task SIDs",
274         "uses genfs_contexts",
275         "not configured for labeling",
276         "uses mountpoint labeling",
277 };
278
279 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
280
281 static inline int inode_doinit(struct inode *inode)
282 {
283         return inode_doinit_with_dentry(inode, NULL);
284 }
285
286 enum {
287         Opt_context = 1,
288         Opt_fscontext = 2,
289         Opt_defcontext = 4,
290 };
291
292 static match_table_t tokens = {
293         {Opt_context, "context=%s"},
294         {Opt_fscontext, "fscontext=%s"},
295         {Opt_defcontext, "defcontext=%s"},
296 };
297
298 #define SEL_MOUNT_FAIL_MSG "SELinux:  duplicate or incompatible mount options\n"
299
300 static int try_context_mount(struct super_block *sb, void *data)
301 {
302         char *context = NULL, *defcontext = NULL;
303         const char *name;
304         u32 sid;
305         int alloc = 0, rc = 0, seen = 0;
306         struct task_security_struct *tsec = current->security;
307         struct superblock_security_struct *sbsec = sb->s_security;
308
309         if (!data)
310                 goto out;
311
312         name = sb->s_type->name;
313
314         if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
315
316                 /* NFS we understand. */
317                 if (!strcmp(name, "nfs")) {
318                         struct nfs_mount_data *d = data;
319
320                         if (d->version <  NFS_MOUNT_VERSION)
321                                 goto out;
322
323                         if (d->context[0]) {
324                                 context = d->context;
325                                 seen |= Opt_context;
326                         }
327                 } else
328                         goto out;
329
330         } else {
331                 /* Standard string-based options. */
332                 char *p, *options = data;
333
334                 while ((p = strsep(&options, ",")) != NULL) {
335                         int token;
336                         substring_t args[MAX_OPT_ARGS];
337
338                         if (!*p)
339                                 continue;
340
341                         token = match_token(p, tokens, args);
342
343                         switch (token) {
344                         case Opt_context:
345                                 if (seen) {
346                                         rc = -EINVAL;
347                                         printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
348                                         goto out_free;
349                                 }
350                                 context = match_strdup(&args[0]);
351                                 if (!context) {
352                                         rc = -ENOMEM;
353                                         goto out_free;
354                                 }
355                                 if (!alloc)
356                                         alloc = 1;
357                                 seen |= Opt_context;
358                                 break;
359
360                         case Opt_fscontext:
361                                 if (seen & (Opt_context|Opt_fscontext)) {
362                                         rc = -EINVAL;
363                                         printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
364                                         goto out_free;
365                                 }
366                                 context = match_strdup(&args[0]);
367                                 if (!context) {
368                                         rc = -ENOMEM;
369                                         goto out_free;
370                                 }
371                                 if (!alloc)
372                                         alloc = 1;
373                                 seen |= Opt_fscontext;
374                                 break;
375
376                         case Opt_defcontext:
377                                 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
378                                         rc = -EINVAL;
379                                         printk(KERN_WARNING "SELinux:  "
380                                                "defcontext option is invalid "
381                                                "for this filesystem type\n");
382                                         goto out_free;
383                                 }
384                                 if (seen & (Opt_context|Opt_defcontext)) {
385                                         rc = -EINVAL;
386                                         printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
387                                         goto out_free;
388                                 }
389                                 defcontext = match_strdup(&args[0]);
390                                 if (!defcontext) {
391                                         rc = -ENOMEM;
392                                         goto out_free;
393                                 }
394                                 if (!alloc)
395                                         alloc = 1;
396                                 seen |= Opt_defcontext;
397                                 break;
398
399                         default:
400                                 rc = -EINVAL;
401                                 printk(KERN_WARNING "SELinux:  unknown mount "
402                                        "option\n");
403                                 goto out_free;
404
405                         }
406                 }
407         }
408
409         if (!seen)
410                 goto out;
411
412         if (context) {
413                 rc = security_context_to_sid(context, strlen(context), &sid);
414                 if (rc) {
415                         printk(KERN_WARNING "SELinux: security_context_to_sid"
416                                "(%s) failed for (dev %s, type %s) errno=%d\n",
417                                context, sb->s_id, name, rc);
418                         goto out_free;
419                 }
420
421                 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
422                                   FILESYSTEM__RELABELFROM, NULL);
423                 if (rc)
424                         goto out_free;
425
426                 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
427                                   FILESYSTEM__RELABELTO, NULL);
428                 if (rc)
429                         goto out_free;
430
431                 sbsec->sid = sid;
432
433                 if (seen & Opt_context)
434                         sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
435         }
436
437         if (defcontext) {
438                 rc = security_context_to_sid(defcontext, strlen(defcontext), &sid);
439                 if (rc) {
440                         printk(KERN_WARNING "SELinux: security_context_to_sid"
441                                "(%s) failed for (dev %s, type %s) errno=%d\n",
442                                defcontext, sb->s_id, name, rc);
443                         goto out_free;
444                 }
445
446                 if (sid == sbsec->def_sid)
447                         goto out_free;
448
449                 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
450                                   FILESYSTEM__RELABELFROM, NULL);
451                 if (rc)
452                         goto out_free;
453
454                 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
455                                   FILESYSTEM__ASSOCIATE, NULL);
456                 if (rc)
457                         goto out_free;
458
459                 sbsec->def_sid = sid;
460         }
461
462 out_free:
463         if (alloc) {
464                 kfree(context);
465                 kfree(defcontext);
466         }
467 out:
468         return rc;
469 }
470
471 static int superblock_doinit(struct super_block *sb, void *data)
472 {
473         struct superblock_security_struct *sbsec = sb->s_security;
474         struct dentry *root = sb->s_root;
475         struct inode *inode = root->d_inode;
476         int rc = 0;
477
478         down(&sbsec->sem);
479         if (sbsec->initialized)
480                 goto out;
481
482         if (!ss_initialized) {
483                 /* Defer initialization until selinux_complete_init,
484                    after the initial policy is loaded and the security
485                    server is ready to handle calls. */
486                 spin_lock(&sb_security_lock);
487                 if (list_empty(&sbsec->list))
488                         list_add(&sbsec->list, &superblock_security_head);
489                 spin_unlock(&sb_security_lock);
490                 goto out;
491         }
492
493         /* Determine the labeling behavior to use for this filesystem type. */
494         rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
495         if (rc) {
496                 printk(KERN_WARNING "%s:  security_fs_use(%s) returned %d\n",
497                        __FUNCTION__, sb->s_type->name, rc);
498                 goto out;
499         }
500
501         rc = try_context_mount(sb, data);
502         if (rc)
503                 goto out;
504
505         if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
506                 /* Make sure that the xattr handler exists and that no
507                    error other than -ENODATA is returned by getxattr on
508                    the root directory.  -ENODATA is ok, as this may be
509                    the first boot of the SELinux kernel before we have
510                    assigned xattr values to the filesystem. */
511                 if (!inode->i_op->getxattr) {
512                         printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
513                                "xattr support\n", sb->s_id, sb->s_type->name);
514                         rc = -EOPNOTSUPP;
515                         goto out;
516                 }
517                 rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
518                 if (rc < 0 && rc != -ENODATA) {
519                         if (rc == -EOPNOTSUPP)
520                                 printk(KERN_WARNING "SELinux: (dev %s, type "
521                                        "%s) has no security xattr handler\n",
522                                        sb->s_id, sb->s_type->name);
523                         else
524                                 printk(KERN_WARNING "SELinux: (dev %s, type "
525                                        "%s) getxattr errno %d\n", sb->s_id,
526                                        sb->s_type->name, -rc);
527                         goto out;
528                 }
529         }
530
531         if (strcmp(sb->s_type->name, "proc") == 0)
532                 sbsec->proc = 1;
533
534         sbsec->initialized = 1;
535
536         if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) {
537                 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), unknown behavior\n",
538                        sb->s_id, sb->s_type->name);
539         }
540         else {
541                 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), %s\n",
542                        sb->s_id, sb->s_type->name,
543                        labeling_behaviors[sbsec->behavior-1]);
544         }
545
546         /* Initialize the root inode. */
547         rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root);
548
549         /* Initialize any other inodes associated with the superblock, e.g.
550            inodes created prior to initial policy load or inodes created
551            during get_sb by a pseudo filesystem that directly
552            populates itself. */
553         spin_lock(&sbsec->isec_lock);
554 next_inode:
555         if (!list_empty(&sbsec->isec_head)) {
556                 struct inode_security_struct *isec =
557                                 list_entry(sbsec->isec_head.next,
558                                            struct inode_security_struct, list);
559                 struct inode *inode = isec->inode;
560                 spin_unlock(&sbsec->isec_lock);
561                 inode = igrab(inode);
562                 if (inode) {
563                         if (!IS_PRIVATE (inode))
564                                 inode_doinit(inode);
565                         iput(inode);
566                 }
567                 spin_lock(&sbsec->isec_lock);
568                 list_del_init(&isec->list);
569                 goto next_inode;
570         }
571         spin_unlock(&sbsec->isec_lock);
572 out:
573         up(&sbsec->sem);
574         return rc;
575 }
576
577 static inline u16 inode_mode_to_security_class(umode_t mode)
578 {
579         switch (mode & S_IFMT) {
580         case S_IFSOCK:
581                 return SECCLASS_SOCK_FILE;
582         case S_IFLNK:
583                 return SECCLASS_LNK_FILE;
584         case S_IFREG:
585                 return SECCLASS_FILE;
586         case S_IFBLK:
587                 return SECCLASS_BLK_FILE;
588         case S_IFDIR:
589                 return SECCLASS_DIR;
590         case S_IFCHR:
591                 return SECCLASS_CHR_FILE;
592         case S_IFIFO:
593                 return SECCLASS_FIFO_FILE;
594
595         }
596
597         return SECCLASS_FILE;
598 }
599
600 static inline int default_protocol_stream(int protocol)
601 {
602         return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
603 }
604
605 static inline int default_protocol_dgram(int protocol)
606 {
607         return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
608 }
609
610 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
611 {
612         switch (family) {
613         case PF_UNIX:
614                 switch (type) {
615                 case SOCK_STREAM:
616                 case SOCK_SEQPACKET:
617                         return SECCLASS_UNIX_STREAM_SOCKET;
618                 case SOCK_DGRAM:
619                         return SECCLASS_UNIX_DGRAM_SOCKET;
620                 }
621                 break;
622         case PF_INET:
623         case PF_INET6:
624                 switch (type) {
625                 case SOCK_STREAM:
626                         if (default_protocol_stream(protocol))
627                                 return SECCLASS_TCP_SOCKET;
628                         else
629                                 return SECCLASS_RAWIP_SOCKET;
630                 case SOCK_DGRAM:
631                         if (default_protocol_dgram(protocol))
632                                 return SECCLASS_UDP_SOCKET;
633                         else
634                                 return SECCLASS_RAWIP_SOCKET;
635                 default:
636                         return SECCLASS_RAWIP_SOCKET;
637                 }
638                 break;
639         case PF_NETLINK:
640                 switch (protocol) {
641                 case NETLINK_ROUTE:
642                         return SECCLASS_NETLINK_ROUTE_SOCKET;
643                 case NETLINK_FIREWALL:
644                         return SECCLASS_NETLINK_FIREWALL_SOCKET;
645                 case NETLINK_INET_DIAG:
646                         return SECCLASS_NETLINK_TCPDIAG_SOCKET;
647                 case NETLINK_NFLOG:
648                         return SECCLASS_NETLINK_NFLOG_SOCKET;
649                 case NETLINK_XFRM:
650                         return SECCLASS_NETLINK_XFRM_SOCKET;
651                 case NETLINK_SELINUX:
652                         return SECCLASS_NETLINK_SELINUX_SOCKET;
653                 case NETLINK_AUDIT:
654                         return SECCLASS_NETLINK_AUDIT_SOCKET;
655                 case NETLINK_IP6_FW:
656                         return SECCLASS_NETLINK_IP6FW_SOCKET;
657                 case NETLINK_DNRTMSG:
658                         return SECCLASS_NETLINK_DNRT_SOCKET;
659                 case NETLINK_KOBJECT_UEVENT:
660                         return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
661                 default:
662                         return SECCLASS_NETLINK_SOCKET;
663                 }
664         case PF_PACKET:
665                 return SECCLASS_PACKET_SOCKET;
666         case PF_KEY:
667                 return SECCLASS_KEY_SOCKET;
668         }
669
670         return SECCLASS_SOCKET;
671 }
672
673 #ifdef CONFIG_PROC_FS
674 static int selinux_proc_get_sid(struct proc_dir_entry *de,
675                                 u16 tclass,
676                                 u32 *sid)
677 {
678         int buflen, rc;
679         char *buffer, *path, *end;
680
681         buffer = (char*)__get_free_page(GFP_KERNEL);
682         if (!buffer)
683                 return -ENOMEM;
684
685         buflen = PAGE_SIZE;
686         end = buffer+buflen;
687         *--end = '\0';
688         buflen--;
689         path = end-1;
690         *path = '/';
691         while (de && de != de->parent) {
692                 buflen -= de->namelen + 1;
693                 if (buflen < 0)
694                         break;
695                 end -= de->namelen;
696                 memcpy(end, de->name, de->namelen);
697                 *--end = '/';
698                 path = end;
699                 de = de->parent;
700         }
701         rc = security_genfs_sid("proc", path, tclass, sid);
702         free_page((unsigned long)buffer);
703         return rc;
704 }
705 #else
706 static int selinux_proc_get_sid(struct proc_dir_entry *de,
707                                 u16 tclass,
708                                 u32 *sid)
709 {
710         return -EINVAL;
711 }
712 #endif
713
714 /* The inode's security attributes must be initialized before first use. */
715 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
716 {
717         struct superblock_security_struct *sbsec = NULL;
718         struct inode_security_struct *isec = inode->i_security;
719         u32 sid;
720         struct dentry *dentry;
721 #define INITCONTEXTLEN 255
722         char *context = NULL;
723         unsigned len = 0;
724         int rc = 0;
725         int hold_sem = 0;
726
727         if (isec->initialized)
728                 goto out;
729
730         down(&isec->sem);
731         hold_sem = 1;
732         if (isec->initialized)
733                 goto out;
734
735         sbsec = inode->i_sb->s_security;
736         if (!sbsec->initialized) {
737                 /* Defer initialization until selinux_complete_init,
738                    after the initial policy is loaded and the security
739                    server is ready to handle calls. */
740                 spin_lock(&sbsec->isec_lock);
741                 if (list_empty(&isec->list))
742                         list_add(&isec->list, &sbsec->isec_head);
743                 spin_unlock(&sbsec->isec_lock);
744                 goto out;
745         }
746
747         switch (sbsec->behavior) {
748         case SECURITY_FS_USE_XATTR:
749                 if (!inode->i_op->getxattr) {
750                         isec->sid = sbsec->def_sid;
751                         break;
752                 }
753
754                 /* Need a dentry, since the xattr API requires one.
755                    Life would be simpler if we could just pass the inode. */
756                 if (opt_dentry) {
757                         /* Called from d_instantiate or d_splice_alias. */
758                         dentry = dget(opt_dentry);
759                 } else {
760                         /* Called from selinux_complete_init, try to find a dentry. */
761                         dentry = d_find_alias(inode);
762                 }
763                 if (!dentry) {
764                         printk(KERN_WARNING "%s:  no dentry for dev=%s "
765                                "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id,
766                                inode->i_ino);
767                         goto out;
768                 }
769
770                 len = INITCONTEXTLEN;
771                 context = kmalloc(len, GFP_KERNEL);
772                 if (!context) {
773                         rc = -ENOMEM;
774                         dput(dentry);
775                         goto out;
776                 }
777                 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
778                                            context, len);
779                 if (rc == -ERANGE) {
780                         /* Need a larger buffer.  Query for the right size. */
781                         rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
782                                                    NULL, 0);
783                         if (rc < 0) {
784                                 dput(dentry);
785                                 goto out;
786                         }
787                         kfree(context);
788                         len = rc;
789                         context = kmalloc(len, GFP_KERNEL);
790                         if (!context) {
791                                 rc = -ENOMEM;
792                                 dput(dentry);
793                                 goto out;
794                         }
795                         rc = inode->i_op->getxattr(dentry,
796                                                    XATTR_NAME_SELINUX,
797                                                    context, len);
798                 }
799                 dput(dentry);
800                 if (rc < 0) {
801                         if (rc != -ENODATA) {
802                                 printk(KERN_WARNING "%s:  getxattr returned "
803                                        "%d for dev=%s ino=%ld\n", __FUNCTION__,
804                                        -rc, inode->i_sb->s_id, inode->i_ino);
805                                 kfree(context);
806                                 goto out;
807                         }
808                         /* Map ENODATA to the default file SID */
809                         sid = sbsec->def_sid;
810                         rc = 0;
811                 } else {
812                         rc = security_context_to_sid_default(context, rc, &sid,
813                                                              sbsec->def_sid);
814                         if (rc) {
815                                 printk(KERN_WARNING "%s:  context_to_sid(%s) "
816                                        "returned %d for dev=%s ino=%ld\n",
817                                        __FUNCTION__, context, -rc,
818                                        inode->i_sb->s_id, inode->i_ino);
819                                 kfree(context);
820                                 /* Leave with the unlabeled SID */
821                                 rc = 0;
822                                 break;
823                         }
824                 }
825                 kfree(context);
826                 isec->sid = sid;
827                 break;
828         case SECURITY_FS_USE_TASK:
829                 isec->sid = isec->task_sid;
830                 break;
831         case SECURITY_FS_USE_TRANS:
832                 /* Default to the fs SID. */
833                 isec->sid = sbsec->sid;
834
835                 /* Try to obtain a transition SID. */
836                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
837                 rc = security_transition_sid(isec->task_sid,
838                                              sbsec->sid,
839                                              isec->sclass,
840                                              &sid);
841                 if (rc)
842                         goto out;
843                 isec->sid = sid;
844                 break;
845         default:
846                 /* Default to the fs SID. */
847                 isec->sid = sbsec->sid;
848
849                 if (sbsec->proc) {
850                         struct proc_inode *proci = PROC_I(inode);
851                         if (proci->pde) {
852                                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
853                                 rc = selinux_proc_get_sid(proci->pde,
854                                                           isec->sclass,
855                                                           &sid);
856                                 if (rc)
857                                         goto out;
858                                 isec->sid = sid;
859                         }
860                 }
861                 break;
862         }
863
864         isec->initialized = 1;
865
866 out:
867         if (isec->sclass == SECCLASS_FILE)
868                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
869
870         if (hold_sem)
871                 up(&isec->sem);
872         return rc;
873 }
874
875 /* Convert a Linux signal to an access vector. */
876 static inline u32 signal_to_av(int sig)
877 {
878         u32 perm = 0;
879
880         switch (sig) {
881         case SIGCHLD:
882                 /* Commonly granted from child to parent. */
883                 perm = PROCESS__SIGCHLD;
884                 break;
885         case SIGKILL:
886                 /* Cannot be caught or ignored */
887                 perm = PROCESS__SIGKILL;
888                 break;
889         case SIGSTOP:
890                 /* Cannot be caught or ignored */
891                 perm = PROCESS__SIGSTOP;
892                 break;
893         default:
894                 /* All other signals. */
895                 perm = PROCESS__SIGNAL;
896                 break;
897         }
898
899         return perm;
900 }
901
902 /* Check permission betweeen a pair of tasks, e.g. signal checks,
903    fork check, ptrace check, etc. */
904 static int task_has_perm(struct task_struct *tsk1,
905                          struct task_struct *tsk2,
906                          u32 perms)
907 {
908         struct task_security_struct *tsec1, *tsec2;
909
910         tsec1 = tsk1->security;
911         tsec2 = tsk2->security;
912         return avc_has_perm(tsec1->sid, tsec2->sid,
913                             SECCLASS_PROCESS, perms, NULL);
914 }
915
916 /* Check whether a task is allowed to use a capability. */
917 static int task_has_capability(struct task_struct *tsk,
918                                int cap)
919 {
920         struct task_security_struct *tsec;
921         struct avc_audit_data ad;
922
923         tsec = tsk->security;
924
925         AVC_AUDIT_DATA_INIT(&ad,CAP);
926         ad.tsk = tsk;
927         ad.u.cap = cap;
928
929         return avc_has_perm(tsec->sid, tsec->sid,
930                             SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad);
931 }
932
933 /* Check whether a task is allowed to use a system operation. */
934 static int task_has_system(struct task_struct *tsk,
935                            u32 perms)
936 {
937         struct task_security_struct *tsec;
938
939         tsec = tsk->security;
940
941         return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
942                             SECCLASS_SYSTEM, perms, NULL);
943 }
944
945 /* Check whether a task has a particular permission to an inode.
946    The 'adp' parameter is optional and allows other audit
947    data to be passed (e.g. the dentry). */
948 static int inode_has_perm(struct task_struct *tsk,
949                           struct inode *inode,
950                           u32 perms,
951                           struct avc_audit_data *adp)
952 {
953         struct task_security_struct *tsec;
954         struct inode_security_struct *isec;
955         struct avc_audit_data ad;
956
957         tsec = tsk->security;
958         isec = inode->i_security;
959
960         if (!adp) {
961                 adp = &ad;
962                 AVC_AUDIT_DATA_INIT(&ad, FS);
963                 ad.u.fs.inode = inode;
964         }
965
966         return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
967 }
968
969 /* Same as inode_has_perm, but pass explicit audit data containing
970    the dentry to help the auditing code to more easily generate the
971    pathname if needed. */
972 static inline int dentry_has_perm(struct task_struct *tsk,
973                                   struct vfsmount *mnt,
974                                   struct dentry *dentry,
975                                   u32 av)
976 {
977         struct inode *inode = dentry->d_inode;
978         struct avc_audit_data ad;
979         AVC_AUDIT_DATA_INIT(&ad,FS);
980         ad.u.fs.mnt = mnt;
981         ad.u.fs.dentry = dentry;
982         return inode_has_perm(tsk, inode, av, &ad);
983 }
984
985 /* Check whether a task can use an open file descriptor to
986    access an inode in a given way.  Check access to the
987    descriptor itself, and then use dentry_has_perm to
988    check a particular permission to the file.
989    Access to the descriptor is implicitly granted if it
990    has the same SID as the process.  If av is zero, then
991    access to the file is not checked, e.g. for cases
992    where only the descriptor is affected like seek. */
993 static int file_has_perm(struct task_struct *tsk,
994                                 struct file *file,
995                                 u32 av)
996 {
997         struct task_security_struct *tsec = tsk->security;
998         struct file_security_struct *fsec = file->f_security;
999         struct vfsmount *mnt = file->f_vfsmnt;
1000         struct dentry *dentry = file->f_dentry;
1001         struct inode *inode = dentry->d_inode;
1002         struct avc_audit_data ad;
1003         int rc;
1004
1005         AVC_AUDIT_DATA_INIT(&ad, FS);
1006         ad.u.fs.mnt = mnt;
1007         ad.u.fs.dentry = dentry;
1008
1009         if (tsec->sid != fsec->sid) {
1010                 rc = avc_has_perm(tsec->sid, fsec->sid,
1011                                   SECCLASS_FD,
1012                                   FD__USE,
1013                                   &ad);
1014                 if (rc)
1015                         return rc;
1016         }
1017
1018         /* av is zero if only checking access to the descriptor. */
1019         if (av)
1020                 return inode_has_perm(tsk, inode, av, &ad);
1021
1022         return 0;
1023 }
1024
1025 /* Check whether a task can create a file. */
1026 static int may_create(struct inode *dir,
1027                       struct dentry *dentry,
1028                       u16 tclass)
1029 {
1030         struct task_security_struct *tsec;
1031         struct inode_security_struct *dsec;
1032         struct superblock_security_struct *sbsec;
1033         u32 newsid;
1034         struct avc_audit_data ad;
1035         int rc;
1036
1037         tsec = current->security;
1038         dsec = dir->i_security;
1039         sbsec = dir->i_sb->s_security;
1040
1041         AVC_AUDIT_DATA_INIT(&ad, FS);
1042         ad.u.fs.dentry = dentry;
1043
1044         rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
1045                           DIR__ADD_NAME | DIR__SEARCH,
1046                           &ad);
1047         if (rc)
1048                 return rc;
1049
1050         if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1051                 newsid = tsec->create_sid;
1052         } else {
1053                 rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
1054                                              &newsid);
1055                 if (rc)
1056                         return rc;
1057         }
1058
1059         rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
1060         if (rc)
1061                 return rc;
1062
1063         return avc_has_perm(newsid, sbsec->sid,
1064                             SECCLASS_FILESYSTEM,
1065                             FILESYSTEM__ASSOCIATE, &ad);
1066 }
1067
1068 #define MAY_LINK   0
1069 #define MAY_UNLINK 1
1070 #define MAY_RMDIR  2
1071
1072 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1073 static int may_link(struct inode *dir,
1074                     struct dentry *dentry,
1075                     int kind)
1076
1077 {
1078         struct task_security_struct *tsec;
1079         struct inode_security_struct *dsec, *isec;
1080         struct avc_audit_data ad;
1081         u32 av;
1082         int rc;
1083
1084         tsec = current->security;
1085         dsec = dir->i_security;
1086         isec = dentry->d_inode->i_security;
1087
1088         AVC_AUDIT_DATA_INIT(&ad, FS);
1089         ad.u.fs.dentry = dentry;
1090
1091         av = DIR__SEARCH;
1092         av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1093         rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
1094         if (rc)
1095                 return rc;
1096
1097         switch (kind) {
1098         case MAY_LINK:
1099                 av = FILE__LINK;
1100                 break;
1101         case MAY_UNLINK:
1102                 av = FILE__UNLINK;
1103                 break;
1104         case MAY_RMDIR:
1105                 av = DIR__RMDIR;
1106                 break;
1107         default:
1108                 printk(KERN_WARNING "may_link:  unrecognized kind %d\n", kind);
1109                 return 0;
1110         }
1111
1112         rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
1113         return rc;
1114 }
1115
1116 static inline int may_rename(struct inode *old_dir,
1117                              struct dentry *old_dentry,
1118                              struct inode *new_dir,
1119                              struct dentry *new_dentry)
1120 {
1121         struct task_security_struct *tsec;
1122         struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1123         struct avc_audit_data ad;
1124         u32 av;
1125         int old_is_dir, new_is_dir;
1126         int rc;
1127
1128         tsec = current->security;
1129         old_dsec = old_dir->i_security;
1130         old_isec = old_dentry->d_inode->i_security;
1131         old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1132         new_dsec = new_dir->i_security;
1133
1134         AVC_AUDIT_DATA_INIT(&ad, FS);
1135
1136         ad.u.fs.dentry = old_dentry;
1137         rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
1138                           DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1139         if (rc)
1140                 return rc;
1141         rc = avc_has_perm(tsec->sid, old_isec->sid,
1142                           old_isec->sclass, FILE__RENAME, &ad);
1143         if (rc)
1144                 return rc;
1145         if (old_is_dir && new_dir != old_dir) {
1146                 rc = avc_has_perm(tsec->sid, old_isec->sid,
1147                                   old_isec->sclass, DIR__REPARENT, &ad);
1148                 if (rc)
1149                         return rc;
1150         }
1151
1152         ad.u.fs.dentry = new_dentry;
1153         av = DIR__ADD_NAME | DIR__SEARCH;
1154         if (new_dentry->d_inode)
1155                 av |= DIR__REMOVE_NAME;
1156         rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1157         if (rc)
1158                 return rc;
1159         if (new_dentry->d_inode) {
1160                 new_isec = new_dentry->d_inode->i_security;
1161                 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1162                 rc = avc_has_perm(tsec->sid, new_isec->sid,
1163                                   new_isec->sclass,
1164                                   (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1165                 if (rc)
1166                         return rc;
1167         }
1168
1169         return 0;
1170 }
1171
1172 /* Check whether a task can perform a filesystem operation. */
1173 static int superblock_has_perm(struct task_struct *tsk,
1174                                struct super_block *sb,
1175                                u32 perms,
1176                                struct avc_audit_data *ad)
1177 {
1178         struct task_security_struct *tsec;
1179         struct superblock_security_struct *sbsec;
1180
1181         tsec = tsk->security;
1182         sbsec = sb->s_security;
1183         return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
1184                             perms, ad);
1185 }
1186
1187 /* Convert a Linux mode and permission mask to an access vector. */
1188 static inline u32 file_mask_to_av(int mode, int mask)
1189 {
1190         u32 av = 0;
1191
1192         if ((mode & S_IFMT) != S_IFDIR) {
1193                 if (mask & MAY_EXEC)
1194                         av |= FILE__EXECUTE;
1195                 if (mask & MAY_READ)
1196                         av |= FILE__READ;
1197
1198                 if (mask & MAY_APPEND)
1199                         av |= FILE__APPEND;
1200                 else if (mask & MAY_WRITE)
1201                         av |= FILE__WRITE;
1202
1203         } else {
1204                 if (mask & MAY_EXEC)
1205                         av |= DIR__SEARCH;
1206                 if (mask & MAY_WRITE)
1207                         av |= DIR__WRITE;
1208                 if (mask & MAY_READ)
1209                         av |= DIR__READ;
1210         }
1211
1212         return av;
1213 }
1214
1215 /* Convert a Linux file to an access vector. */
1216 static inline u32 file_to_av(struct file *file)
1217 {
1218         u32 av = 0;
1219
1220         if (file->f_mode & FMODE_READ)
1221                 av |= FILE__READ;
1222         if (file->f_mode & FMODE_WRITE) {
1223                 if (file->f_flags & O_APPEND)
1224                         av |= FILE__APPEND;
1225                 else
1226                         av |= FILE__WRITE;
1227         }
1228
1229         return av;
1230 }
1231
1232 /* Set an inode's SID to a specified value. */
1233 static int inode_security_set_sid(struct inode *inode, u32 sid)
1234 {
1235         struct inode_security_struct *isec = inode->i_security;
1236         struct superblock_security_struct *sbsec = inode->i_sb->s_security;
1237
1238         if (!sbsec->initialized) {
1239                 /* Defer initialization to selinux_complete_init. */
1240                 return 0;
1241         }
1242
1243         down(&isec->sem);
1244         isec->sclass = inode_mode_to_security_class(inode->i_mode);
1245         isec->sid = sid;
1246         isec->initialized = 1;
1247         up(&isec->sem);
1248         return 0;
1249 }
1250
1251 /* Hook functions begin here. */
1252
1253 static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
1254 {
1255         struct task_security_struct *psec = parent->security;
1256         struct task_security_struct *csec = child->security;
1257         int rc;
1258
1259         rc = secondary_ops->ptrace(parent,child);
1260         if (rc)
1261                 return rc;
1262
1263         rc = task_has_perm(parent, child, PROCESS__PTRACE);
1264         /* Save the SID of the tracing process for later use in apply_creds. */
1265         if (!(child->ptrace & PT_PTRACED) && !rc)
1266                 csec->ptrace_sid = psec->sid;
1267         return rc;
1268 }
1269
1270 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1271                           kernel_cap_t *inheritable, kernel_cap_t *permitted)
1272 {
1273         int error;
1274
1275         error = task_has_perm(current, target, PROCESS__GETCAP);
1276         if (error)
1277                 return error;
1278
1279         return secondary_ops->capget(target, effective, inheritable, permitted);
1280 }
1281
1282 static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
1283                                 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1284 {
1285         int error;
1286
1287         error = secondary_ops->capset_check(target, effective, inheritable, permitted);
1288         if (error)
1289                 return error;
1290
1291         return task_has_perm(current, target, PROCESS__SETCAP);
1292 }
1293
1294 static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
1295                                kernel_cap_t *inheritable, kernel_cap_t *permitted)
1296 {
1297         secondary_ops->capset_set(target, effective, inheritable, permitted);
1298 }
1299
1300 static int selinux_capable(struct task_struct *tsk, int cap)
1301 {
1302         int rc;
1303
1304         rc = secondary_ops->capable(tsk, cap);
1305         if (rc)
1306                 return rc;
1307
1308         return task_has_capability(tsk,cap);
1309 }
1310
1311 static int selinux_sysctl(ctl_table *table, int op)
1312 {
1313         int error = 0;
1314         u32 av;
1315         struct task_security_struct *tsec;
1316         u32 tsid;
1317         int rc;
1318
1319         rc = secondary_ops->sysctl(table, op);
1320         if (rc)
1321                 return rc;
1322
1323         tsec = current->security;
1324
1325         rc = selinux_proc_get_sid(table->de, (op == 001) ?
1326                                   SECCLASS_DIR : SECCLASS_FILE, &tsid);
1327         if (rc) {
1328                 /* Default to the well-defined sysctl SID. */
1329                 tsid = SECINITSID_SYSCTL;
1330         }
1331
1332         /* The op values are "defined" in sysctl.c, thereby creating
1333          * a bad coupling between this module and sysctl.c */
1334         if(op == 001) {
1335                 error = avc_has_perm(tsec->sid, tsid,
1336                                      SECCLASS_DIR, DIR__SEARCH, NULL);
1337         } else {
1338                 av = 0;
1339                 if (op & 004)
1340                         av |= FILE__READ;
1341                 if (op & 002)
1342                         av |= FILE__WRITE;
1343                 if (av)
1344                         error = avc_has_perm(tsec->sid, tsid,
1345                                              SECCLASS_FILE, av, NULL);
1346         }
1347
1348         return error;
1349 }
1350
1351 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1352 {
1353         int rc = 0;
1354
1355         if (!sb)
1356                 return 0;
1357
1358         switch (cmds) {
1359                 case Q_SYNC:
1360                 case Q_QUOTAON:
1361                 case Q_QUOTAOFF:
1362                 case Q_SETINFO:
1363                 case Q_SETQUOTA:
1364                         rc = superblock_has_perm(current,
1365                                                  sb,
1366                                                  FILESYSTEM__QUOTAMOD, NULL);
1367                         break;
1368                 case Q_GETFMT:
1369                 case Q_GETINFO:
1370                 case Q_GETQUOTA:
1371                         rc = superblock_has_perm(current,
1372                                                  sb,
1373                                                  FILESYSTEM__QUOTAGET, NULL);
1374                         break;
1375                 default:
1376                         rc = 0;  /* let the kernel handle invalid cmds */
1377                         break;
1378         }
1379         return rc;
1380 }
1381
1382 static int selinux_quota_on(struct dentry *dentry)
1383 {
1384         return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
1385 }
1386
1387 static int selinux_syslog(int type)
1388 {
1389         int rc;
1390
1391         rc = secondary_ops->syslog(type);
1392         if (rc)
1393                 return rc;
1394
1395         switch (type) {
1396                 case 3:         /* Read last kernel messages */
1397                 case 10:        /* Return size of the log buffer */
1398                         rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1399                         break;
1400                 case 6:         /* Disable logging to console */
1401                 case 7:         /* Enable logging to console */
1402                 case 8:         /* Set level of messages printed to console */
1403                         rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1404                         break;
1405                 case 0:         /* Close log */
1406                 case 1:         /* Open log */
1407                 case 2:         /* Read from log */
1408                 case 4:         /* Read/clear last kernel messages */
1409                 case 5:         /* Clear ring buffer */
1410                 default:
1411                         rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
1412                         break;
1413         }
1414         return rc;
1415 }
1416
1417 /*
1418  * Check that a process has enough memory to allocate a new virtual
1419  * mapping. 0 means there is enough memory for the allocation to
1420  * succeed and -ENOMEM implies there is not.
1421  *
1422  * Note that secondary_ops->capable and task_has_perm_noaudit return 0
1423  * if the capability is granted, but __vm_enough_memory requires 1 if
1424  * the capability is granted.
1425  *
1426  * Do not audit the selinux permission check, as this is applied to all
1427  * processes that allocate mappings.
1428  */
1429 static int selinux_vm_enough_memory(long pages)
1430 {
1431         int rc, cap_sys_admin = 0;
1432         struct task_security_struct *tsec = current->security;
1433
1434         rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
1435         if (rc == 0)
1436                 rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
1437                                         SECCLASS_CAPABILITY,
1438                                         CAP_TO_MASK(CAP_SYS_ADMIN),
1439                                         NULL);
1440
1441         if (rc == 0)
1442                 cap_sys_admin = 1;
1443
1444         return __vm_enough_memory(pages, cap_sys_admin);
1445 }
1446
1447 /* binprm security operations */
1448
1449 static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
1450 {
1451         struct bprm_security_struct *bsec;
1452
1453         bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
1454         if (!bsec)
1455                 return -ENOMEM;
1456
1457         bsec->bprm = bprm;
1458         bsec->sid = SECINITSID_UNLABELED;
1459         bsec->set = 0;
1460
1461         bprm->security = bsec;
1462         return 0;
1463 }
1464
1465 static int selinux_bprm_set_security(struct linux_binprm *bprm)
1466 {
1467         struct task_security_struct *tsec;
1468         struct inode *inode = bprm->file->f_dentry->d_inode;
1469         struct inode_security_struct *isec;
1470         struct bprm_security_struct *bsec;
1471         u32 newsid;
1472         struct avc_audit_data ad;
1473         int rc;
1474
1475         rc = secondary_ops->bprm_set_security(bprm);
1476         if (rc)
1477                 return rc;
1478
1479         bsec = bprm->security;
1480
1481         if (bsec->set)
1482                 return 0;
1483
1484         tsec = current->security;
1485         isec = inode->i_security;
1486
1487         /* Default to the current task SID. */
1488         bsec->sid = tsec->sid;
1489
1490         /* Reset create SID on execve. */
1491         tsec->create_sid = 0;
1492
1493         if (tsec->exec_sid) {
1494                 newsid = tsec->exec_sid;
1495                 /* Reset exec SID on execve. */
1496                 tsec->exec_sid = 0;
1497         } else {
1498                 /* Check for a default transition on this program. */
1499                 rc = security_transition_sid(tsec->sid, isec->sid,
1500                                              SECCLASS_PROCESS, &newsid);
1501                 if (rc)
1502                         return rc;
1503         }
1504
1505         AVC_AUDIT_DATA_INIT(&ad, FS);
1506         ad.u.fs.mnt = bprm->file->f_vfsmnt;
1507         ad.u.fs.dentry = bprm->file->f_dentry;
1508
1509         if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
1510                 newsid = tsec->sid;
1511
1512         if (tsec->sid == newsid) {
1513                 rc = avc_has_perm(tsec->sid, isec->sid,
1514                                   SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
1515                 if (rc)
1516                         return rc;
1517         } else {
1518                 /* Check permissions for the transition. */
1519                 rc = avc_has_perm(tsec->sid, newsid,
1520                                   SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
1521                 if (rc)
1522                         return rc;
1523
1524                 rc = avc_has_perm(newsid, isec->sid,
1525                                   SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
1526                 if (rc)
1527                         return rc;
1528
1529                 /* Clear any possibly unsafe personality bits on exec: */
1530                 current->personality &= ~PER_CLEAR_ON_SETID;
1531
1532                 /* Set the security field to the new SID. */
1533                 bsec->sid = newsid;
1534         }
1535
1536         bsec->set = 1;
1537         return 0;
1538 }
1539
1540 static int selinux_bprm_check_security (struct linux_binprm *bprm)
1541 {
1542         return secondary_ops->bprm_check_security(bprm);
1543 }
1544
1545
1546 static int selinux_bprm_secureexec (struct linux_binprm *bprm)
1547 {
1548         struct task_security_struct *tsec = current->security;
1549         int atsecure = 0;
1550
1551         if (tsec->osid != tsec->sid) {
1552                 /* Enable secure mode for SIDs transitions unless
1553                    the noatsecure permission is granted between
1554                    the two SIDs, i.e. ahp returns 0. */
1555                 atsecure = avc_has_perm(tsec->osid, tsec->sid,
1556                                          SECCLASS_PROCESS,
1557                                          PROCESS__NOATSECURE, NULL);
1558         }
1559
1560         return (atsecure || secondary_ops->bprm_secureexec(bprm));
1561 }
1562
1563 static void selinux_bprm_free_security(struct linux_binprm *bprm)
1564 {
1565         kfree(bprm->security);
1566         bprm->security = NULL;
1567 }
1568
1569 extern struct vfsmount *selinuxfs_mount;
1570 extern struct dentry *selinux_null;
1571
1572 /* Derived from fs/exec.c:flush_old_files. */
1573 static inline void flush_unauthorized_files(struct files_struct * files)
1574 {
1575         struct avc_audit_data ad;
1576         struct file *file, *devnull = NULL;
1577         struct tty_struct *tty = current->signal->tty;
1578         struct fdtable *fdt;
1579         long j = -1;
1580
1581         if (tty) {
1582                 file_list_lock();
1583                 file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
1584                 if (file) {
1585                         /* Revalidate access to controlling tty.
1586                            Use inode_has_perm on the tty inode directly rather
1587                            than using file_has_perm, as this particular open
1588                            file may belong to another process and we are only
1589                            interested in the inode-based check here. */
1590                         struct inode *inode = file->f_dentry->d_inode;
1591                         if (inode_has_perm(current, inode,
1592                                            FILE__READ | FILE__WRITE, NULL)) {
1593                                 /* Reset controlling tty. */
1594                                 current->signal->tty = NULL;
1595                                 current->signal->tty_old_pgrp = 0;
1596                         }
1597                 }
1598                 file_list_unlock();
1599         }
1600
1601         /* Revalidate access to inherited open files. */
1602
1603         AVC_AUDIT_DATA_INIT(&ad,FS);
1604
1605         spin_lock(&files->file_lock);
1606         for (;;) {
1607                 unsigned long set, i;
1608                 int fd;
1609
1610                 j++;
1611                 i = j * __NFDBITS;
1612                 fdt = files_fdtable(files);
1613                 if (i >= fdt->max_fds || i >= fdt->max_fdset)
1614                         break;
1615                 set = fdt->open_fds->fds_bits[j];
1616                 if (!set)
1617                         continue;
1618                 spin_unlock(&files->file_lock);
1619                 for ( ; set ; i++,set >>= 1) {
1620                         if (set & 1) {
1621                                 file = fget(i);
1622                                 if (!file)
1623                                         continue;
1624                                 if (file_has_perm(current,
1625                                                   file,
1626                                                   file_to_av(file))) {
1627                                         sys_close(i);
1628                                         fd = get_unused_fd();
1629                                         if (fd != i) {
1630                                                 if (fd >= 0)
1631                                                         put_unused_fd(fd);
1632                                                 fput(file);
1633                                                 continue;
1634                                         }
1635                                         if (devnull) {
1636                                                 get_file(devnull);
1637                                         } else {
1638                                                 devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
1639                                                 if (!devnull) {
1640                                                         put_unused_fd(fd);
1641                                                         fput(file);
1642                                                         continue;
1643                                                 }
1644                                         }
1645                                         fd_install(fd, devnull);
1646                                 }
1647                                 fput(file);
1648                         }
1649                 }
1650                 spin_lock(&files->file_lock);
1651
1652         }
1653         spin_unlock(&files->file_lock);
1654 }
1655
1656 static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
1657 {
1658         struct task_security_struct *tsec;
1659         struct bprm_security_struct *bsec;
1660         u32 sid;
1661         int rc;
1662
1663         secondary_ops->bprm_apply_creds(bprm, unsafe);
1664
1665         tsec = current->security;
1666
1667         bsec = bprm->security;
1668         sid = bsec->sid;
1669
1670         tsec->osid = tsec->sid;
1671         bsec->unsafe = 0;
1672         if (tsec->sid != sid) {
1673                 /* Check for shared state.  If not ok, leave SID
1674                    unchanged and kill. */
1675                 if (unsafe & LSM_UNSAFE_SHARE) {
1676                         rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
1677                                         PROCESS__SHARE, NULL);
1678                         if (rc) {
1679                                 bsec->unsafe = 1;
1680                                 return;
1681                         }
1682                 }
1683
1684                 /* Check for ptracing, and update the task SID if ok.
1685                    Otherwise, leave SID unchanged and kill. */
1686                 if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
1687                         rc = avc_has_perm(tsec->ptrace_sid, sid,
1688                                           SECCLASS_PROCESS, PROCESS__PTRACE,
1689                                           NULL);
1690                         if (rc) {
1691                                 bsec->unsafe = 1;
1692                                 return;
1693                         }
1694                 }
1695                 tsec->sid = sid;
1696         }
1697 }
1698
1699 /*
1700  * called after apply_creds without the task lock held
1701  */
1702 static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
1703 {
1704         struct task_security_struct *tsec;
1705         struct rlimit *rlim, *initrlim;
1706         struct itimerval itimer;
1707         struct bprm_security_struct *bsec;
1708         int rc, i;
1709
1710         tsec = current->security;
1711         bsec = bprm->security;
1712
1713         if (bsec->unsafe) {
1714                 force_sig_specific(SIGKILL, current);
1715                 return;
1716         }
1717         if (tsec->osid == tsec->sid)
1718                 return;
1719
1720         /* Close files for which the new task SID is not authorized. */
1721         flush_unauthorized_files(current->files);
1722
1723         /* Check whether the new SID can inherit signal state
1724            from the old SID.  If not, clear itimers to avoid
1725            subsequent signal generation and flush and unblock
1726            signals. This must occur _after_ the task SID has
1727           been updated so that any kill done after the flush
1728           will be checked against the new SID. */
1729         rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1730                           PROCESS__SIGINH, NULL);
1731         if (rc) {
1732                 memset(&itimer, 0, sizeof itimer);
1733                 for (i = 0; i < 3; i++)
1734                         do_setitimer(i, &itimer, NULL);
1735                 flush_signals(current);
1736                 spin_lock_irq(&current->sighand->siglock);
1737                 flush_signal_handlers(current, 1);
1738                 sigemptyset(&current->blocked);
1739                 recalc_sigpending();
1740                 spin_unlock_irq(&current->sighand->siglock);
1741         }
1742
1743         /* Check whether the new SID can inherit resource limits
1744            from the old SID.  If not, reset all soft limits to
1745            the lower of the current task's hard limit and the init
1746            task's soft limit.  Note that the setting of hard limits
1747            (even to lower them) can be controlled by the setrlimit
1748            check. The inclusion of the init task's soft limit into
1749            the computation is to avoid resetting soft limits higher
1750            than the default soft limit for cases where the default
1751            is lower than the hard limit, e.g. RLIMIT_CORE or
1752            RLIMIT_STACK.*/
1753         rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1754                           PROCESS__RLIMITINH, NULL);
1755         if (rc) {
1756                 for (i = 0; i < RLIM_NLIMITS; i++) {
1757                         rlim = current->signal->rlim + i;
1758                         initrlim = init_task.signal->rlim+i;
1759                         rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur);
1760                 }
1761                 if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
1762                         /*
1763                          * This will cause RLIMIT_CPU calculations
1764                          * to be refigured.
1765                          */
1766                         current->it_prof_expires = jiffies_to_cputime(1);
1767                 }
1768         }
1769
1770         /* Wake up the parent if it is waiting so that it can
1771            recheck wait permission to the new task SID. */
1772         wake_up_interruptible(&current->parent->signal->wait_chldexit);
1773 }
1774
1775 /* superblock security operations */
1776
1777 static int selinux_sb_alloc_security(struct super_block *sb)
1778 {
1779         return superblock_alloc_security(sb);
1780 }
1781
1782 static void selinux_sb_free_security(struct super_block *sb)
1783 {
1784         superblock_free_security(sb);
1785 }
1786
1787 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
1788 {
1789         if (plen > olen)
1790                 return 0;
1791
1792         return !memcmp(prefix, option, plen);
1793 }
1794
1795 static inline int selinux_option(char *option, int len)
1796 {
1797         return (match_prefix("context=", sizeof("context=")-1, option, len) ||
1798                 match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) ||
1799                 match_prefix("defcontext=", sizeof("defcontext=")-1, option, len));
1800 }
1801
1802 static inline void take_option(char **to, char *from, int *first, int len)
1803 {
1804         if (!*first) {
1805                 **to = ',';
1806                 *to += 1;
1807         }
1808         else
1809                 *first = 0;
1810         memcpy(*to, from, len);
1811         *to += len;
1812 }
1813
1814 static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy)
1815 {
1816         int fnosec, fsec, rc = 0;
1817         char *in_save, *in_curr, *in_end;
1818         char *sec_curr, *nosec_save, *nosec;
1819
1820         in_curr = orig;
1821         sec_curr = copy;
1822
1823         /* Binary mount data: just copy */
1824         if (type->fs_flags & FS_BINARY_MOUNTDATA) {
1825                 copy_page(sec_curr, in_curr);
1826                 goto out;
1827         }
1828
1829         nosec = (char *)get_zeroed_page(GFP_KERNEL);
1830         if (!nosec) {
1831                 rc = -ENOMEM;
1832                 goto out;
1833         }
1834
1835         nosec_save = nosec;
1836         fnosec = fsec = 1;
1837         in_save = in_end = orig;
1838
1839         do {
1840                 if (*in_end == ',' || *in_end == '\0') {
1841                         int len = in_end - in_curr;
1842
1843                         if (selinux_option(in_curr, len))
1844                                 take_option(&sec_curr, in_curr, &fsec, len);
1845                         else
1846                                 take_option(&nosec, in_curr, &fnosec, len);
1847
1848                         in_curr = in_end + 1;
1849                 }
1850         } while (*in_end++);
1851
1852         strcpy(in_save, nosec_save);
1853         free_page((unsigned long)nosec_save);
1854 out:
1855         return rc;
1856 }
1857
1858 static int selinux_sb_kern_mount(struct super_block *sb, void *data)
1859 {
1860         struct avc_audit_data ad;
1861         int rc;
1862
1863         rc = superblock_doinit(sb, data);
1864         if (rc)
1865                 return rc;
1866
1867         AVC_AUDIT_DATA_INIT(&ad,FS);
1868         ad.u.fs.dentry = sb->s_root;
1869         return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
1870 }
1871
1872 static int selinux_sb_statfs(struct super_block *sb)
1873 {
1874         struct avc_audit_data ad;
1875
1876         AVC_AUDIT_DATA_INIT(&ad,FS);
1877         ad.u.fs.dentry = sb->s_root;
1878         return superblock_has_perm(current, sb, FILESYSTEM__GETATTR, &ad);
1879 }
1880
1881 static int selinux_mount(char * dev_name,
1882                          struct nameidata *nd,
1883                          char * type,
1884                          unsigned long flags,
1885                          void * data)
1886 {
1887         int rc;
1888
1889         rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data);
1890         if (rc)
1891                 return rc;
1892
1893         if (flags & MS_REMOUNT)
1894                 return superblock_has_perm(current, nd->mnt->mnt_sb,
1895                                            FILESYSTEM__REMOUNT, NULL);
1896         else
1897                 return dentry_has_perm(current, nd->mnt, nd->dentry,
1898                                        FILE__MOUNTON);
1899 }
1900
1901 static int selinux_umount(struct vfsmount *mnt, int flags)
1902 {
1903         int rc;
1904
1905         rc = secondary_ops->sb_umount(mnt, flags);
1906         if (rc)
1907                 return rc;
1908
1909         return superblock_has_perm(current,mnt->mnt_sb,
1910                                    FILESYSTEM__UNMOUNT,NULL);
1911 }
1912
1913 /* inode security operations */
1914
1915 static int selinux_inode_alloc_security(struct inode *inode)
1916 {
1917         return inode_alloc_security(inode);
1918 }
1919
1920 static void selinux_inode_free_security(struct inode *inode)
1921 {
1922         inode_free_security(inode);
1923 }
1924
1925 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
1926                                        char **name, void **value,
1927                                        size_t *len)
1928 {
1929         struct task_security_struct *tsec;
1930         struct inode_security_struct *dsec;
1931         struct superblock_security_struct *sbsec;
1932         u32 newsid, clen;
1933         int rc;
1934         char *namep = NULL, *context;
1935
1936         tsec = current->security;
1937         dsec = dir->i_security;
1938         sbsec = dir->i_sb->s_security;
1939
1940         if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1941                 newsid = tsec->create_sid;
1942         } else {
1943                 rc = security_transition_sid(tsec->sid, dsec->sid,
1944                                              inode_mode_to_security_class(inode->i_mode),
1945                                              &newsid);
1946                 if (rc) {
1947                         printk(KERN_WARNING "%s:  "
1948                                "security_transition_sid failed, rc=%d (dev=%s "
1949                                "ino=%ld)\n",
1950                                __FUNCTION__,
1951                                -rc, inode->i_sb->s_id, inode->i_ino);
1952                         return rc;
1953                 }
1954         }
1955
1956         inode_security_set_sid(inode, newsid);
1957
1958         if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
1959                 return -EOPNOTSUPP;
1960
1961         if (name) {
1962                 namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
1963                 if (!namep)
1964                         return -ENOMEM;
1965                 *name = namep;
1966         }
1967
1968         if (value && len) {
1969                 rc = security_sid_to_context(newsid, &context, &clen);
1970                 if (rc) {
1971                         kfree(namep);
1972                         return rc;
1973                 }
1974                 *value = context;
1975                 *len = clen;
1976         }
1977
1978         return 0;
1979 }
1980
1981 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
1982 {
1983         return may_create(dir, dentry, SECCLASS_FILE);
1984 }
1985
1986 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
1987 {
1988         int rc;
1989
1990         rc = secondary_ops->inode_link(old_dentry,dir,new_dentry);
1991         if (rc)
1992                 return rc;
1993         return may_link(dir, old_dentry, MAY_LINK);
1994 }
1995
1996 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
1997 {
1998         int rc;
1999
2000         rc = secondary_ops->inode_unlink(dir, dentry);
2001         if (rc)
2002                 return rc;
2003         return may_link(dir, dentry, MAY_UNLINK);
2004 }
2005
2006 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2007 {
2008         return may_create(dir, dentry, SECCLASS_LNK_FILE);
2009 }
2010
2011 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2012 {
2013         return may_create(dir, dentry, SECCLASS_DIR);
2014 }
2015
2016 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2017 {
2018         return may_link(dir, dentry, MAY_RMDIR);
2019 }
2020
2021 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2022 {
2023         int rc;
2024
2025         rc = secondary_ops->inode_mknod(dir, dentry, mode, dev);
2026         if (rc)
2027                 return rc;
2028
2029         return may_create(dir, dentry, inode_mode_to_security_class(mode));
2030 }
2031
2032 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2033                                 struct inode *new_inode, struct dentry *new_dentry)
2034 {
2035         return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2036 }
2037
2038 static int selinux_inode_readlink(struct dentry *dentry)
2039 {
2040         return dentry_has_perm(current, NULL, dentry, FILE__READ);
2041 }
2042
2043 static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2044 {
2045         int rc;
2046
2047         rc = secondary_ops->inode_follow_link(dentry,nameidata);
2048         if (rc)
2049                 return rc;
2050         return dentry_has_perm(current, NULL, dentry, FILE__READ);
2051 }
2052
2053 static int selinux_inode_permission(struct inode *inode, int mask,
2054                                     struct nameidata *nd)
2055 {
2056         int rc;
2057
2058         rc = secondary_ops->inode_permission(inode, mask, nd);
2059         if (rc)
2060                 return rc;
2061
2062         if (!mask) {
2063                 /* No permission to check.  Existence test. */
2064                 return 0;
2065         }
2066
2067         return inode_has_perm(current, inode,
2068                                file_mask_to_av(inode->i_mode, mask), NULL);
2069 }
2070
2071 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2072 {
2073         int rc;
2074
2075         rc = secondary_ops->inode_setattr(dentry, iattr);
2076         if (rc)
2077                 return rc;
2078
2079         if (iattr->ia_valid & ATTR_FORCE)
2080                 return 0;
2081
2082         if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2083                                ATTR_ATIME_SET | ATTR_MTIME_SET))
2084                 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2085
2086         return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
2087 }
2088
2089 static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2090 {
2091         return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
2092 }
2093
2094 static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags)
2095 {
2096         struct task_security_struct *tsec = current->security;
2097         struct inode *inode = dentry->d_inode;
2098         struct inode_security_struct *isec = inode->i_security;
2099         struct superblock_security_struct *sbsec;
2100         struct avc_audit_data ad;
2101         u32 newsid;
2102         int rc = 0;
2103
2104         if (strcmp(name, XATTR_NAME_SELINUX)) {
2105                 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2106                              sizeof XATTR_SECURITY_PREFIX - 1) &&
2107                     !capable(CAP_SYS_ADMIN)) {
2108                         /* A different attribute in the security namespace.
2109                            Restrict to administrator. */
2110                         return -EPERM;
2111                 }
2112
2113                 /* Not an attribute we recognize, so just check the
2114                    ordinary setattr permission. */
2115                 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2116         }
2117
2118         sbsec = inode->i_sb->s_security;
2119         if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2120                 return -EOPNOTSUPP;
2121
2122         if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
2123                 return -EPERM;
2124
2125         AVC_AUDIT_DATA_INIT(&ad,FS);
2126         ad.u.fs.dentry = dentry;
2127
2128         rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
2129                           FILE__RELABELFROM, &ad);
2130         if (rc)
2131                 return rc;
2132
2133         rc = security_context_to_sid(value, size, &newsid);
2134         if (rc)
2135                 return rc;
2136
2137         rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
2138                           FILE__RELABELTO, &ad);
2139         if (rc)
2140                 return rc;
2141
2142         rc = security_validate_transition(isec->sid, newsid, tsec->sid,
2143                                           isec->sclass);
2144         if (rc)
2145                 return rc;
2146
2147         return avc_has_perm(newsid,
2148                             sbsec->sid,
2149                             SECCLASS_FILESYSTEM,
2150                             FILESYSTEM__ASSOCIATE,
2151                             &ad);
2152 }
2153
2154 static void selinux_inode_post_setxattr(struct dentry *dentry, char *name,
2155                                         void *value, size_t size, int flags)
2156 {
2157         struct inode *inode = dentry->d_inode;
2158         struct inode_security_struct *isec = inode->i_security;
2159         u32 newsid;
2160         int rc;
2161
2162         if (strcmp(name, XATTR_NAME_SELINUX)) {
2163                 /* Not an attribute we recognize, so nothing to do. */
2164                 return;
2165         }
2166
2167         rc = security_context_to_sid(value, size, &newsid);
2168         if (rc) {
2169                 printk(KERN_WARNING "%s:  unable to obtain SID for context "
2170                        "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc);
2171                 return;
2172         }
2173
2174         isec->sid = newsid;
2175         return;
2176 }
2177
2178 static int selinux_inode_getxattr (struct dentry *dentry, char *name)
2179 {
2180         return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2181 }
2182
2183 static int selinux_inode_listxattr (struct dentry *dentry)
2184 {
2185         return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2186 }
2187
2188 static int selinux_inode_removexattr (struct dentry *dentry, char *name)
2189 {
2190         if (strcmp(name, XATTR_NAME_SELINUX)) {
2191                 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2192                              sizeof XATTR_SECURITY_PREFIX - 1) &&
2193                     !capable(CAP_SYS_ADMIN)) {
2194                         /* A different attribute in the security namespace.
2195                            Restrict to administrator. */
2196                         return -EPERM;
2197                 }
2198
2199                 /* Not an attribute we recognize, so just check the
2200                    ordinary setattr permission. Might want a separate
2201                    permission for removexattr. */
2202                 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2203         }
2204
2205         /* No one is allowed to remove a SELinux security label.
2206            You can change the label, but all data must be labeled. */
2207         return -EACCES;
2208 }
2209
2210 /*
2211  * Copy the in-core inode security context value to the user.  If the
2212  * getxattr() prior to this succeeded, check to see if we need to
2213  * canonicalize the value to be finally returned to the user.
2214  *
2215  * Permission check is handled by selinux_inode_getxattr hook.
2216  */
2217 static int selinux_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err)
2218 {
2219         struct inode_security_struct *isec = inode->i_security;
2220         char *context;
2221         unsigned len;
2222         int rc;
2223
2224         if (strcmp(name, XATTR_SELINUX_SUFFIX)) {
2225                 rc = -EOPNOTSUPP;
2226                 goto out;
2227         }
2228
2229         rc = security_sid_to_context(isec->sid, &context, &len);
2230         if (rc)
2231                 goto out;
2232
2233         /* Probe for required buffer size */
2234         if (!buffer || !size) {
2235                 rc = len;
2236                 goto out_free;
2237         }
2238
2239         if (size < len) {
2240                 rc = -ERANGE;
2241                 goto out_free;
2242         }
2243
2244         if (err > 0) {
2245                 if ((len == err) && !(memcmp(context, buffer, len))) {
2246                         /* Don't need to canonicalize value */
2247                         rc = err;
2248                         goto out_free;
2249                 }
2250                 memset(buffer, 0, size);
2251         }
2252         memcpy(buffer, context, len);
2253         rc = len;
2254 out_free:
2255         kfree(context);
2256 out:
2257         return rc;
2258 }
2259
2260 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2261                                      const void *value, size_t size, int flags)
2262 {
2263         struct inode_security_struct *isec = inode->i_security;
2264         u32 newsid;
2265         int rc;
2266
2267         if (strcmp(name, XATTR_SELINUX_SUFFIX))
2268                 return -EOPNOTSUPP;
2269
2270         if (!value || !size)
2271                 return -EACCES;
2272
2273         rc = security_context_to_sid((void*)value, size, &newsid);
2274         if (rc)
2275                 return rc;
2276
2277         isec->sid = newsid;
2278         return 0;
2279 }
2280
2281 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2282 {
2283         const int len = sizeof(XATTR_NAME_SELINUX);
2284         if (buffer && len <= buffer_size)
2285                 memcpy(buffer, XATTR_NAME_SELINUX, len);
2286         return len;
2287 }
2288
2289 /* file security operations */
2290
2291 static int selinux_file_permission(struct file *file, int mask)
2292 {
2293         struct inode *inode = file->f_dentry->d_inode;
2294
2295         if (!mask) {
2296                 /* No permission to check.  Existence test. */
2297                 return 0;
2298         }
2299
2300         /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2301         if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2302                 mask |= MAY_APPEND;
2303
2304         return file_has_perm(current, file,
2305                              file_mask_to_av(inode->i_mode, mask));
2306 }
2307
2308 static int selinux_file_alloc_security(struct file *file)
2309 {
2310         return file_alloc_security(file);
2311 }
2312
2313 static void selinux_file_free_security(struct file *file)
2314 {
2315         file_free_security(file);
2316 }
2317
2318 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2319                               unsigned long arg)
2320 {
2321         int error = 0;
2322
2323         switch (cmd) {
2324                 case FIONREAD:
2325                 /* fall through */
2326                 case FIBMAP:
2327                 /* fall through */
2328                 case FIGETBSZ:
2329                 /* fall through */
2330                 case EXT2_IOC_GETFLAGS:
2331                 /* fall through */
2332                 case EXT2_IOC_GETVERSION:
2333                         error = file_has_perm(current, file, FILE__GETATTR);
2334                         break;
2335
2336                 case EXT2_IOC_SETFLAGS:
2337                 /* fall through */
2338                 case EXT2_IOC_SETVERSION:
2339                         error = file_has_perm(current, file, FILE__SETATTR);
2340                         break;
2341
2342                 /* sys_ioctl() checks */
2343                 case FIONBIO:
2344                 /* fall through */
2345                 case FIOASYNC:
2346                         error = file_has_perm(current, file, 0);
2347                         break;
2348
2349                 case KDSKBENT:
2350                 case KDSKBSENT:
2351                         error = task_has_capability(current,CAP_SYS_TTY_CONFIG);
2352                         break;
2353
2354                 /* default case assumes that the command will go
2355                  * to the file's ioctl() function.
2356                  */
2357                 default:
2358                         error = file_has_perm(current, file, FILE__IOCTL);
2359
2360         }
2361         return error;
2362 }
2363
2364 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2365 {
2366 #ifndef CONFIG_PPC32
2367         if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
2368                 /*
2369                  * We are making executable an anonymous mapping or a
2370                  * private file mapping that will also be writable.
2371                  * This has an additional check.
2372                  */
2373                 int rc = task_has_perm(current, current, PROCESS__EXECMEM);
2374                 if (rc)
2375                         return rc;
2376         }
2377 #endif
2378
2379         if (file) {
2380                 /* read access is always possible with a mapping */
2381                 u32 av = FILE__READ;
2382
2383                 /* write access only matters if the mapping is shared */
2384                 if (shared && (prot & PROT_WRITE))
2385                         av |= FILE__WRITE;
2386
2387                 if (prot & PROT_EXEC)
2388                         av |= FILE__EXECUTE;
2389
2390                 return file_has_perm(current, file, av);
2391         }
2392         return 0;
2393 }
2394
2395 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
2396                              unsigned long prot, unsigned long flags)
2397 {
2398         int rc;
2399
2400         rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
2401         if (rc)
2402                 return rc;
2403
2404         if (selinux_checkreqprot)
2405                 prot = reqprot;
2406
2407         return file_map_prot_check(file, prot,
2408                                    (flags & MAP_TYPE) == MAP_SHARED);
2409 }
2410
2411 static int selinux_file_mprotect(struct vm_area_struct *vma,
2412                                  unsigned long reqprot,
2413                                  unsigned long prot)
2414 {
2415         int rc;
2416
2417         rc = secondary_ops->file_mprotect(vma, reqprot, prot);
2418         if (rc)
2419                 return rc;
2420
2421         if (selinux_checkreqprot)
2422                 prot = reqprot;
2423
2424 #ifndef CONFIG_PPC32
2425         if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
2426                 rc = 0;
2427                 if (vma->vm_start >= vma->vm_mm->start_brk &&
2428                     vma->vm_end <= vma->vm_mm->brk) {
2429                         rc = task_has_perm(current, current,
2430                                            PROCESS__EXECHEAP);
2431                 } else if (!vma->vm_file &&
2432                            vma->vm_start <= vma->vm_mm->start_stack &&
2433                            vma->vm_end >= vma->vm_mm->start_stack) {
2434                         rc = task_has_perm(current, current, PROCESS__EXECSTACK);
2435                 } else if (vma->vm_file && vma->anon_vma) {
2436                         /*
2437                          * We are making executable a file mapping that has
2438                          * had some COW done. Since pages might have been
2439                          * written, check ability to execute the possibly
2440                          * modified content.  This typically should only
2441                          * occur for text relocations.
2442                          */
2443                         rc = file_has_perm(current, vma->vm_file,
2444                                            FILE__EXECMOD);
2445                 }
2446                 if (rc)
2447                         return rc;
2448         }
2449 #endif
2450
2451         return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
2452 }
2453
2454 static int selinux_file_lock(struct file *file, unsigned int cmd)
2455 {
2456         return file_has_perm(current, file, FILE__LOCK);
2457 }
2458
2459 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
2460                               unsigned long arg)
2461 {
2462         int err = 0;
2463
2464         switch (cmd) {
2465                 case F_SETFL:
2466                         if (!file->f_dentry || !file->f_dentry->d_inode) {
2467                                 err = -EINVAL;
2468                                 break;
2469                         }
2470
2471                         if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
2472                                 err = file_has_perm(current, file,FILE__WRITE);
2473                                 break;
2474                         }
2475                         /* fall through */
2476                 case F_SETOWN:
2477                 case F_SETSIG:
2478                 case F_GETFL:
2479                 case F_GETOWN:
2480                 case F_GETSIG:
2481                         /* Just check FD__USE permission */
2482                         err = file_has_perm(current, file, 0);
2483                         break;
2484                 case F_GETLK:
2485                 case F_SETLK:
2486                 case F_SETLKW:
2487 #if BITS_PER_LONG == 32
2488                 case F_GETLK64:
2489                 case F_SETLK64:
2490                 case F_SETLKW64:
2491 #endif
2492                         if (!file->f_dentry || !file->f_dentry->d_inode) {
2493                                 err = -EINVAL;
2494                                 break;
2495                         }
2496                         err = file_has_perm(current, file, FILE__LOCK);
2497                         break;
2498         }
2499
2500         return err;
2501 }
2502
2503 static int selinux_file_set_fowner(struct file *file)
2504 {
2505         struct task_security_struct *tsec;
2506         struct file_security_struct *fsec;
2507
2508         tsec = current->security;
2509         fsec = file->f_security;
2510         fsec->fown_sid = tsec->sid;
2511
2512         return 0;
2513 }
2514
2515 static int selinux_file_send_sigiotask(struct task_struct *tsk,
2516                                        struct fown_struct *fown, int signum)
2517 {
2518         struct file *file;
2519         u32 perm;
2520         struct task_security_struct *tsec;
2521         struct file_security_struct *fsec;
2522
2523         /* struct fown_struct is never outside the context of a struct file */
2524         file = (struct file *)((long)fown - offsetof(struct file,f_owner));
2525
2526         tsec = tsk->security;
2527         fsec = file->f_security;
2528
2529         if (!signum)
2530                 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
2531         else
2532                 perm = signal_to_av(signum);
2533
2534         return avc_has_perm(fsec->fown_sid, tsec->sid,
2535                             SECCLASS_PROCESS, perm, NULL);
2536 }
2537
2538 static int selinux_file_receive(struct file *file)
2539 {
2540         return file_has_perm(current, file, file_to_av(file));
2541 }
2542
2543 /* task security operations */
2544
2545 static int selinux_task_create(unsigned long clone_flags)
2546 {
2547         int rc;
2548
2549         rc = secondary_ops->task_create(clone_flags);
2550         if (rc)
2551                 return rc;
2552
2553         return task_has_perm(current, current, PROCESS__FORK);
2554 }
2555
2556 static int selinux_task_alloc_security(struct task_struct *tsk)
2557 {
2558         struct task_security_struct *tsec1, *tsec2;
2559         int rc;
2560
2561         tsec1 = current->security;
2562
2563         rc = task_alloc_security(tsk);
2564         if (rc)
2565                 return rc;
2566         tsec2 = tsk->security;
2567
2568         tsec2->osid = tsec1->osid;
2569         tsec2->sid = tsec1->sid;
2570
2571         /* Retain the exec and create SIDs across fork */
2572         tsec2->exec_sid = tsec1->exec_sid;
2573         tsec2->create_sid = tsec1->create_sid;
2574
2575         /* Retain ptracer SID across fork, if any.
2576            This will be reset by the ptrace hook upon any
2577            subsequent ptrace_attach operations. */
2578         tsec2->ptrace_sid = tsec1->ptrace_sid;
2579
2580         return 0;
2581 }
2582
2583 static void selinux_task_free_security(struct task_struct *tsk)
2584 {
2585         task_free_security(tsk);
2586 }
2587
2588 static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2589 {
2590         /* Since setuid only affects the current process, and
2591            since the SELinux controls are not based on the Linux
2592            identity attributes, SELinux does not need to control
2593            this operation.  However, SELinux does control the use
2594            of the CAP_SETUID and CAP_SETGID capabilities using the
2595            capable hook. */
2596         return 0;
2597 }
2598
2599 static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2600 {
2601         return secondary_ops->task_post_setuid(id0,id1,id2,flags);
2602 }
2603
2604 static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
2605 {
2606         /* See the comment for setuid above. */
2607         return 0;
2608 }
2609
2610 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
2611 {
2612         return task_has_perm(current, p, PROCESS__SETPGID);
2613 }
2614
2615 static int selinux_task_getpgid(struct task_struct *p)
2616 {
2617         return task_has_perm(current, p, PROCESS__GETPGID);
2618 }
2619
2620 static int selinux_task_getsid(struct task_struct *p)
2621 {
2622         return task_has_perm(current, p, PROCESS__GETSESSION);
2623 }
2624
2625 static int selinux_task_setgroups(struct group_info *group_info)
2626 {
2627         /* See the comment for setuid above. */
2628         return 0;
2629 }
2630
2631 static int selinux_task_setnice(struct task_struct *p, int nice)
2632 {
2633         int rc;
2634
2635         rc = secondary_ops->task_setnice(p, nice);
2636         if (rc)
2637                 return rc;
2638
2639         return task_has_perm(current,p, PROCESS__SETSCHED);
2640 }
2641
2642 static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
2643 {
2644         struct rlimit *old_rlim = current->signal->rlim + resource;
2645         int rc;
2646
2647         rc = secondary_ops->task_setrlimit(resource, new_rlim);
2648         if (rc)
2649                 return rc;
2650
2651         /* Control the ability to change the hard limit (whether
2652            lowering or raising it), so that the hard limit can
2653            later be used as a safe reset point for the soft limit
2654            upon context transitions. See selinux_bprm_apply_creds. */
2655         if (old_rlim->rlim_max != new_rlim->rlim_max)
2656                 return task_has_perm(current, current, PROCESS__SETRLIMIT);
2657
2658         return 0;
2659 }
2660
2661 static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
2662 {
2663         return task_has_perm(current, p, PROCESS__SETSCHED);
2664 }
2665
2666 static int selinux_task_getscheduler(struct task_struct *p)
2667 {
2668         return task_has_perm(current, p, PROCESS__GETSCHED);
2669 }
2670
2671 static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig)
2672 {
2673         u32 perm;
2674         int rc;
2675
2676         rc = secondary_ops->task_kill(p, info, sig);
2677         if (rc)
2678                 return rc;
2679
2680         if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
2681                 return 0;
2682
2683         if (!sig)
2684                 perm = PROCESS__SIGNULL; /* null signal; existence test */
2685         else
2686                 perm = signal_to_av(sig);
2687
2688         return task_has_perm(current, p, perm);
2689 }
2690
2691 static int selinux_task_prctl(int option,
2692                               unsigned long arg2,
2693                               unsigned long arg3,
2694                               unsigned long arg4,
2695                               unsigned long arg5)
2696 {
2697         /* The current prctl operations do not appear to require
2698            any SELinux controls since they merely observe or modify
2699            the state of the current process. */
2700         return 0;
2701 }
2702
2703 static int selinux_task_wait(struct task_struct *p)
2704 {
2705         u32 perm;
2706
2707         perm = signal_to_av(p->exit_signal);
2708
2709         return task_has_perm(p, current, perm);
2710 }
2711
2712 static void selinux_task_reparent_to_init(struct task_struct *p)
2713 {
2714         struct task_security_struct *tsec;
2715
2716         secondary_ops->task_reparent_to_init(p);
2717
2718         tsec = p->security;
2719         tsec->osid = tsec->sid;
2720         tsec->sid = SECINITSID_KERNEL;
2721         return;
2722 }
2723
2724 static void selinux_task_to_inode(struct task_struct *p,
2725                                   struct inode *inode)
2726 {
2727         struct task_security_struct *tsec = p->security;
2728         struct inode_security_struct *isec = inode->i_security;
2729
2730         isec->sid = tsec->sid;
2731         isec->initialized = 1;
2732         return;
2733 }
2734
2735 /* Returns error only if unable to parse addresses */
2736 static int selinux_parse_skb_ipv4(struct sk_buff *skb, struct avc_audit_data *ad)
2737 {
2738         int offset, ihlen, ret = -EINVAL;
2739         struct iphdr _iph, *ih;
2740
2741         offset = skb->nh.raw - skb->data;
2742         ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
2743         if (ih == NULL)
2744                 goto out;
2745
2746         ihlen = ih->ihl * 4;
2747         if (ihlen < sizeof(_iph))
2748                 goto out;
2749
2750         ad->u.net.v4info.saddr = ih->saddr;
2751         ad->u.net.v4info.daddr = ih->daddr;
2752         ret = 0;
2753
2754         switch (ih->protocol) {
2755         case IPPROTO_TCP: {
2756                 struct tcphdr _tcph, *th;
2757
2758                 if (ntohs(ih->frag_off) & IP_OFFSET)
2759                         break;
2760
2761                 offset += ihlen;
2762                 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2763                 if (th == NULL)
2764                         break;
2765
2766                 ad->u.net.sport = th->source;
2767                 ad->u.net.dport = th->dest;
2768                 break;
2769         }
2770         
2771         case IPPROTO_UDP: {
2772                 struct udphdr _udph, *uh;
2773                 
2774                 if (ntohs(ih->frag_off) & IP_OFFSET)
2775                         break;
2776                         
2777                 offset += ihlen;
2778                 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2779                 if (uh == NULL)
2780                         break;  
2781
2782                 ad->u.net.sport = uh->source;
2783                 ad->u.net.dport = uh->dest;
2784                 break;
2785         }
2786
2787         default:
2788                 break;
2789         }
2790 out:
2791         return ret;
2792 }
2793
2794 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2795
2796 /* Returns error only if unable to parse addresses */
2797 static int selinux_parse_skb_ipv6(struct sk_buff *skb, struct avc_audit_data *ad)
2798 {
2799         u8 nexthdr;
2800         int ret = -EINVAL, offset;
2801         struct ipv6hdr _ipv6h, *ip6;
2802
2803         offset = skb->nh.raw - skb->data;
2804         ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
2805         if (ip6 == NULL)
2806                 goto out;
2807
2808         ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
2809         ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
2810         ret = 0;
2811
2812         nexthdr = ip6->nexthdr;
2813         offset += sizeof(_ipv6h);
2814         offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
2815         if (offset < 0)
2816                 goto out;
2817
2818         switch (nexthdr) {
2819         case IPPROTO_TCP: {
2820                 struct tcphdr _tcph, *th;
2821
2822                 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2823                 if (th == NULL)
2824                         break;
2825
2826                 ad->u.net.sport = th->source;
2827                 ad->u.net.dport = th->dest;
2828                 break;
2829         }
2830
2831         case IPPROTO_UDP: {
2832                 struct udphdr _udph, *uh;
2833
2834                 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2835                 if (uh == NULL)
2836                         break;
2837
2838                 ad->u.net.sport = uh->source;
2839                 ad->u.net.dport = uh->dest;
2840                 break;
2841         }
2842
2843         /* includes fragments */
2844         default:
2845                 break;
2846         }
2847 out:
2848         return ret;
2849 }
2850
2851 #endif /* IPV6 */
2852
2853 static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
2854                              char **addrp, int *len, int src)
2855 {
2856         int ret = 0;
2857
2858         switch (ad->u.net.family) {
2859         case PF_INET:
2860                 ret = selinux_parse_skb_ipv4(skb, ad);
2861                 if (ret || !addrp)
2862                         break;
2863                 *len = 4;
2864                 *addrp = (char *)(src ? &ad->u.net.v4info.saddr :
2865                                         &ad->u.net.v4info.daddr);
2866                 break;
2867
2868 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2869         case PF_INET6:
2870                 ret = selinux_parse_skb_ipv6(skb, ad);
2871                 if (ret || !addrp)
2872                         break;
2873                 *len = 16;
2874                 *addrp = (char *)(src ? &ad->u.net.v6info.saddr :
2875                                         &ad->u.net.v6info.daddr);
2876                 break;
2877 #endif  /* IPV6 */
2878         default:
2879                 break;
2880         }
2881
2882         return ret;
2883 }
2884
2885 /* socket security operations */
2886 static int socket_has_perm(struct task_struct *task, struct socket *sock,
2887                            u32 perms)
2888 {
2889         struct inode_security_struct *isec;
2890         struct task_security_struct *tsec;
2891         struct avc_audit_data ad;
2892         int err = 0;
2893
2894         tsec = task->security;
2895         isec = SOCK_INODE(sock)->i_security;
2896
2897         if (isec->sid == SECINITSID_KERNEL)
2898                 goto out;
2899
2900         AVC_AUDIT_DATA_INIT(&ad,NET);
2901         ad.u.net.sk = sock->sk;
2902         err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
2903
2904 out:
2905         return err;
2906 }
2907
2908 static int selinux_socket_create(int family, int type,
2909                                  int protocol, int kern)
2910 {
2911         int err = 0;
2912         struct task_security_struct *tsec;
2913
2914         if (kern)
2915                 goto out;
2916
2917         tsec = current->security;
2918         err = avc_has_perm(tsec->sid, tsec->sid,
2919                            socket_type_to_security_class(family, type,
2920                            protocol), SOCKET__CREATE, NULL);
2921
2922 out:
2923         return err;
2924 }
2925
2926 static void selinux_socket_post_create(struct socket *sock, int family,
2927                                        int type, int protocol, int kern)
2928 {
2929         struct inode_security_struct *isec;
2930         struct task_security_struct *tsec;
2931
2932         isec = SOCK_INODE(sock)->i_security;
2933
2934         tsec = current->security;
2935         isec->sclass = socket_type_to_security_class(family, type, protocol);
2936         isec->sid = kern ? SECINITSID_KERNEL : tsec->sid;
2937         isec->initialized = 1;
2938
2939         return;
2940 }
2941
2942 /* Range of port numbers used to automatically bind.
2943    Need to determine whether we should perform a name_bind
2944    permission check between the socket and the port number. */
2945 #define ip_local_port_range_0 sysctl_local_port_range[0]
2946 #define ip_local_port_range_1 sysctl_local_port_range[1]
2947
2948 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
2949 {
2950         u16 family;
2951         int err;
2952
2953         err = socket_has_perm(current, sock, SOCKET__BIND);
2954         if (err)
2955                 goto out;
2956
2957         /*
2958          * If PF_INET or PF_INET6, check name_bind permission for the port.
2959          * Multiple address binding for SCTP is not supported yet: we just
2960          * check the first address now.
2961          */
2962         family = sock->sk->sk_family;
2963         if (family == PF_INET || family == PF_INET6) {
2964                 char *addrp;
2965                 struct inode_security_struct *isec;
2966                 struct task_security_struct *tsec;
2967                 struct avc_audit_data ad;
2968                 struct sockaddr_in *addr4 = NULL;
2969                 struct sockaddr_in6 *addr6 = NULL;
2970                 unsigned short snum;
2971                 struct sock *sk = sock->sk;
2972                 u32 sid, node_perm, addrlen;
2973
2974                 tsec = current->security;
2975                 isec = SOCK_INODE(sock)->i_security;
2976
2977                 if (family == PF_INET) {
2978                         addr4 = (struct sockaddr_in *)address;
2979                         snum = ntohs(addr4->sin_port);
2980                         addrlen = sizeof(addr4->sin_addr.s_addr);
2981                         addrp = (char *)&addr4->sin_addr.s_addr;
2982                 } else {
2983                         addr6 = (struct sockaddr_in6 *)address;
2984                         snum = ntohs(addr6->sin6_port);
2985                         addrlen = sizeof(addr6->sin6_addr.s6_addr);
2986                         addrp = (char *)&addr6->sin6_addr.s6_addr;
2987                 }
2988
2989                 if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) ||
2990                            snum > ip_local_port_range_1)) {
2991                         err = security_port_sid(sk->sk_family, sk->sk_type,
2992                                                 sk->sk_protocol, snum, &sid);
2993                         if (err)
2994                                 goto out;
2995                         AVC_AUDIT_DATA_INIT(&ad,NET);
2996                         ad.u.net.sport = htons(snum);
2997                         ad.u.net.family = family;
2998                         err = avc_has_perm(isec->sid, sid,
2999                                            isec->sclass,
3000                                            SOCKET__NAME_BIND, &ad);
3001                         if (err)
3002                                 goto out;
3003                 }
3004                 
3005                 switch(isec->sclass) {
3006                 case SECCLASS_TCP_SOCKET:
3007                         node_perm = TCP_SOCKET__NODE_BIND;
3008                         break;
3009                         
3010                 case SECCLASS_UDP_SOCKET:
3011                         node_perm = UDP_SOCKET__NODE_BIND;
3012                         break;
3013                         
3014                 default:
3015                         node_perm = RAWIP_SOCKET__NODE_BIND;
3016                         break;
3017                 }
3018                 
3019                 err = security_node_sid(family, addrp, addrlen, &sid);
3020                 if (err)
3021                         goto out;
3022                 
3023                 AVC_AUDIT_DATA_INIT(&ad,NET);
3024                 ad.u.net.sport = htons(snum);
3025                 ad.u.net.family = family;
3026
3027                 if (family == PF_INET)
3028                         ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3029                 else
3030                         ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3031
3032                 err = avc_has_perm(isec->sid, sid,
3033                                    isec->sclass, node_perm, &ad);
3034                 if (err)
3035                         goto out;
3036         }
3037 out:
3038         return err;
3039 }
3040
3041 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3042 {
3043         struct inode_security_struct *isec;
3044         int err;
3045
3046         err = socket_has_perm(current, sock, SOCKET__CONNECT);
3047         if (err)
3048                 return err;
3049
3050         /*
3051          * If a TCP socket, check name_connect permission for the port.
3052          */
3053         isec = SOCK_INODE(sock)->i_security;
3054         if (isec->sclass == SECCLASS_TCP_SOCKET) {
3055                 struct sock *sk = sock->sk;
3056                 struct avc_audit_data ad;
3057                 struct sockaddr_in *addr4 = NULL;
3058                 struct sockaddr_in6 *addr6 = NULL;
3059                 unsigned short snum;
3060                 u32 sid;
3061
3062                 if (sk->sk_family == PF_INET) {
3063                         addr4 = (struct sockaddr_in *)address;
3064                         if (addrlen < sizeof(struct sockaddr_in))
3065                                 return -EINVAL;
3066                         snum = ntohs(addr4->sin_port);
3067                 } else {
3068                         addr6 = (struct sockaddr_in6 *)address;
3069                         if (addrlen < SIN6_LEN_RFC2133)
3070                                 return -EINVAL;
3071                         snum = ntohs(addr6->sin6_port);
3072                 }
3073
3074                 err = security_port_sid(sk->sk_family, sk->sk_type,
3075                                         sk->sk_protocol, snum, &sid);
3076                 if (err)
3077                         goto out;
3078
3079                 AVC_AUDIT_DATA_INIT(&ad,NET);
3080                 ad.u.net.dport = htons(snum);
3081                 ad.u.net.family = sk->sk_family;
3082                 err = avc_has_perm(isec->sid, sid, isec->sclass,
3083                                    TCP_SOCKET__NAME_CONNECT, &ad);
3084                 if (err)
3085                         goto out;
3086         }
3087
3088 out:
3089         return err;
3090 }
3091
3092 static int selinux_socket_listen(struct socket *sock, int backlog)
3093 {
3094         return socket_has_perm(current, sock, SOCKET__LISTEN);
3095 }
3096
3097 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3098 {
3099         int err;
3100         struct inode_security_struct *isec;
3101         struct inode_security_struct *newisec;
3102
3103         err = socket_has_perm(current, sock, SOCKET__ACCEPT);
3104         if (err)
3105                 return err;
3106
3107         newisec = SOCK_INODE(newsock)->i_security;
3108
3109         isec = SOCK_INODE(sock)->i_security;
3110         newisec->sclass = isec->sclass;
3111         newisec->sid = isec->sid;
3112         newisec->initialized = 1;
3113
3114         return 0;
3115 }
3116
3117 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3118                                   int size)
3119 {
3120         return socket_has_perm(current, sock, SOCKET__WRITE);
3121 }
3122
3123 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3124                                   int size, int flags)
3125 {
3126         return socket_has_perm(current, sock, SOCKET__READ);
3127 }
3128
3129 static int selinux_socket_getsockname(struct socket *sock)
3130 {
3131         return socket_has_perm(current, sock, SOCKET__GETATTR);
3132 }
3133
3134 static int selinux_socket_getpeername(struct socket *sock)
3135 {
3136         return socket_has_perm(current, sock, SOCKET__GETATTR);
3137 }
3138
3139 static int selinux_socket_setsockopt(struct socket *sock,int level,int optname)
3140 {
3141         return socket_has_perm(current, sock, SOCKET__SETOPT);
3142 }
3143
3144 static int selinux_socket_getsockopt(struct socket *sock, int level,
3145                                      int optname)
3146 {
3147         return socket_has_perm(current, sock, SOCKET__GETOPT);
3148 }
3149
3150 static int selinux_socket_shutdown(struct socket *sock, int how)
3151 {
3152         return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
3153 }
3154
3155 static int selinux_socket_unix_stream_connect(struct socket *sock,
3156                                               struct socket *other,
3157                                               struct sock *newsk)
3158 {
3159         struct sk_security_struct *ssec;
3160         struct inode_security_struct *isec;
3161         struct inode_security_struct *other_isec;
3162         struct avc_audit_data ad;
3163         int err;
3164
3165         err = secondary_ops->unix_stream_connect(sock, other, newsk);
3166         if (err)
3167                 return err;
3168
3169         isec = SOCK_INODE(sock)->i_security;
3170         other_isec = SOCK_INODE(other)->i_security;
3171
3172         AVC_AUDIT_DATA_INIT(&ad,NET);
3173         ad.u.net.sk = other->sk;
3174
3175         err = avc_has_perm(isec->sid, other_isec->sid,
3176                            isec->sclass,
3177                            UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3178         if (err)
3179                 return err;
3180
3181         /* connecting socket */
3182         ssec = sock->sk->sk_security;
3183         ssec->peer_sid = other_isec->sid;
3184         
3185         /* server child socket */
3186         ssec = newsk->sk_security;
3187         ssec->peer_sid = isec->sid;
3188         
3189         return 0;
3190 }
3191
3192 static int selinux_socket_unix_may_send(struct socket *sock,
3193                                         struct socket *other)
3194 {
3195         struct inode_security_struct *isec;
3196         struct inode_security_struct *other_isec;
3197         struct avc_audit_data ad;
3198         int err;
3199
3200         isec = SOCK_INODE(sock)->i_security;
3201         other_isec = SOCK_INODE(other)->i_security;
3202
3203         AVC_AUDIT_DATA_INIT(&ad,NET);
3204         ad.u.net.sk = other->sk;
3205
3206         err = avc_has_perm(isec->sid, other_isec->sid,
3207                            isec->sclass, SOCKET__SENDTO, &ad);
3208         if (err)
3209                 return err;
3210
3211         return 0;
3212 }
3213
3214 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3215 {
3216         u16 family;
3217         char *addrp;
3218         int len, err = 0;
3219         u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0;
3220         u32 sock_sid = 0;
3221         u16 sock_class = 0;
3222         struct socket *sock;
3223         struct net_device *dev;
3224         struct avc_audit_data ad;
3225
3226         family = sk->sk_family;
3227         if (family != PF_INET && family != PF_INET6)
3228                 goto out;
3229
3230         /* Handle mapped IPv4 packets arriving via IPv6 sockets */
3231         if (family == PF_INET6 && skb->protocol == ntohs(ETH_P_IP))
3232                 family = PF_INET;
3233
3234         read_lock_bh(&sk->sk_callback_lock);
3235         sock = sk->sk_socket;
3236         if (sock) {
3237                 struct inode *inode;
3238                 inode = SOCK_INODE(sock);
3239                 if (inode) {
3240                         struct inode_security_struct *isec;
3241                         isec = inode->i_security;
3242                         sock_sid = isec->sid;
3243                         sock_class = isec->sclass;
3244                 }
3245         }
3246         read_unlock_bh(&sk->sk_callback_lock);
3247         if (!sock_sid)
3248                 goto out;
3249
3250         dev = skb->dev;
3251         if (!dev)
3252                 goto out;
3253
3254         err = sel_netif_sids(dev, &if_sid, NULL);
3255         if (err)
3256                 goto out;
3257
3258         switch (sock_class) {
3259         case SECCLASS_UDP_SOCKET:
3260                 netif_perm = NETIF__UDP_RECV;
3261                 node_perm = NODE__UDP_RECV;
3262                 recv_perm = UDP_SOCKET__RECV_MSG;
3263                 break;
3264         
3265         case SECCLASS_TCP_SOCKET:
3266                 netif_perm = NETIF__TCP_RECV;
3267                 node_perm = NODE__TCP_RECV;
3268                 recv_perm = TCP_SOCKET__RECV_MSG;
3269                 break;
3270         
3271         default:
3272                 netif_perm = NETIF__RAWIP_RECV;
3273                 node_perm = NODE__RAWIP_RECV;
3274                 break;
3275         }
3276
3277         AVC_AUDIT_DATA_INIT(&ad, NET);
3278         ad.u.net.netif = dev->name;
3279         ad.u.net.family = family;
3280
3281         err = selinux_parse_skb(skb, &ad, &addrp, &len, 1);
3282         if (err)
3283                 goto out;
3284
3285         err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, &ad);
3286         if (err)
3287                 goto out;
3288         
3289         /* Fixme: this lookup is inefficient */
3290         err = security_node_sid(family, addrp, len, &node_sid);
3291         if (err)
3292                 goto out;
3293         
3294         err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, &ad);
3295         if (err)
3296                 goto out;
3297
3298         if (recv_perm) {
3299                 u32 port_sid;
3300
3301                 /* Fixme: make this more efficient */
3302                 err = security_port_sid(sk->sk_family, sk->sk_type,
3303                                         sk->sk_protocol, ntohs(ad.u.net.sport),
3304                                         &port_sid);
3305                 if (err)
3306                         goto out;
3307
3308                 err = avc_has_perm(sock_sid, port_sid,
3309                                    sock_class, recv_perm, &ad);
3310         }
3311
3312         if (!err)
3313                 err = selinux_xfrm_sock_rcv_skb(sock_sid, skb);
3314
3315 out:    
3316         return err;
3317 }
3318
3319 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
3320                                             int __user *optlen, unsigned len)
3321 {
3322         int err = 0;
3323         char *scontext;
3324         u32 scontext_len;
3325         struct sk_security_struct *ssec;
3326         struct inode_security_struct *isec;
3327         u32 peer_sid = 0;
3328
3329         isec = SOCK_INODE(sock)->i_security;
3330
3331         /* if UNIX_STREAM check peer_sid, if TCP check dst for labelled sa */
3332         if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET) {
3333                 ssec = sock->sk->sk_security;
3334                 peer_sid = ssec->peer_sid;
3335         }
3336         else if (isec->sclass == SECCLASS_TCP_SOCKET) {
3337                 peer_sid = selinux_socket_getpeer_stream(sock->sk);
3338
3339                 if (peer_sid == SECSID_NULL) {
3340                         err = -ENOPROTOOPT;
3341                         goto out;
3342                 }
3343         }
3344         else {
3345                 err = -ENOPROTOOPT;
3346                 goto out;
3347         }
3348
3349         err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
3350
3351         if (err)
3352                 goto out;
3353
3354         if (scontext_len > len) {
3355                 err = -ERANGE;
3356                 goto out_len;
3357         }
3358
3359         if (copy_to_user(optval, scontext, scontext_len))
3360                 err = -EFAULT;
3361
3362 out_len:
3363         if (put_user(scontext_len, optlen))
3364                 err = -EFAULT;
3365
3366         kfree(scontext);
3367 out:    
3368         return err;
3369 }
3370
3371 static int selinux_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata, u32 *seclen)
3372 {
3373         int err = 0;
3374         u32 peer_sid = selinux_socket_getpeer_dgram(skb);
3375
3376         if (peer_sid == SECSID_NULL)
3377                 return -EINVAL;
3378
3379         err = security_sid_to_context(peer_sid, secdata, seclen);
3380         if (err)
3381                 return err;
3382
3383         return 0;
3384 }
3385
3386
3387
3388 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
3389 {
3390         return sk_alloc_security(sk, family, priority);
3391 }
3392
3393 static void selinux_sk_free_security(struct sock *sk)
3394 {
3395         sk_free_security(sk);
3396 }
3397
3398 static unsigned int selinux_sk_getsid_security(struct sock *sk, struct flowi *fl, u8 dir)
3399 {
3400         struct inode_security_struct *isec;
3401         u32 sock_sid = SECINITSID_ANY_SOCKET;
3402
3403         if (!sk)
3404                 return selinux_no_sk_sid(fl);
3405
3406         read_lock_bh(&sk->sk_callback_lock);
3407         isec = get_sock_isec(sk);
3408
3409         if (isec)
3410                 sock_sid = isec->sid;
3411
3412         read_unlock_bh(&sk->sk_callback_lock);
3413         return sock_sid;
3414 }
3415
3416 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
3417 {
3418         int err = 0;
3419         u32 perm;
3420         struct nlmsghdr *nlh;
3421         struct socket *sock = sk->sk_socket;
3422         struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
3423         
3424         if (skb->len < NLMSG_SPACE(0)) {
3425                 err = -EINVAL;
3426                 goto out;
3427         }
3428         nlh = (struct nlmsghdr *)skb->data;
3429         
3430         err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
3431         if (err) {
3432                 if (err == -EINVAL) {
3433                         audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
3434                                   "SELinux:  unrecognized netlink message"
3435                                   " type=%hu for sclass=%hu\n",
3436                                   nlh->nlmsg_type, isec->sclass);
3437                         if (!selinux_enforcing)
3438                                 err = 0;
3439                 }
3440
3441                 /* Ignore */
3442                 if (err == -ENOENT)
3443                         err = 0;
3444                 goto out;
3445         }
3446
3447         err = socket_has_perm(current, sock, perm);
3448 out:
3449         return err;
3450 }
3451
3452 #ifdef CONFIG_NETFILTER
3453
3454 static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
3455                                               struct sk_buff **pskb,
3456                                               const struct net_device *in,
3457                                               const struct net_device *out,
3458                                               int (*okfn)(struct sk_buff *),
3459                                               u16 family)
3460 {
3461         char *addrp;
3462         int len, err = NF_ACCEPT;
3463         u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0;
3464         struct sock *sk;
3465         struct socket *sock;
3466         struct inode *inode;
3467         struct sk_buff *skb = *pskb;
3468         struct inode_security_struct *isec;
3469         struct avc_audit_data ad;
3470         struct net_device *dev = (struct net_device *)out;
3471         
3472         sk = skb->sk;
3473         if (!sk)
3474                 goto out;
3475                 
3476         sock = sk->sk_socket;
3477         if (!sock)
3478                 goto out;
3479                 
3480         inode = SOCK_INODE(sock);
3481         if (!inode)
3482                 goto out;
3483
3484         err = sel_netif_sids(dev, &if_sid, NULL);
3485         if (err)
3486                 goto out;
3487
3488         isec = inode->i_security;
3489         
3490         switch (isec->sclass) {
3491         case SECCLASS_UDP_SOCKET:
3492                 netif_perm = NETIF__UDP_SEND;
3493                 node_perm = NODE__UDP_SEND;
3494                 send_perm = UDP_SOCKET__SEND_MSG;
3495                 break;
3496         
3497         case SECCLASS_TCP_SOCKET:
3498                 netif_perm = NETIF__TCP_SEND;
3499                 node_perm = NODE__TCP_SEND;
3500                 send_perm = TCP_SOCKET__SEND_MSG;
3501                 break;
3502         
3503         default:
3504                 netif_perm = NETIF__RAWIP_SEND;
3505                 node_perm = NODE__RAWIP_SEND;
3506                 break;
3507         }
3508
3509
3510         AVC_AUDIT_DATA_INIT(&ad, NET);
3511         ad.u.net.netif = dev->name;
3512         ad.u.net.family = family;
3513
3514         err = selinux_parse_skb(skb, &ad, &addrp,
3515                                 &len, 0) ? NF_DROP : NF_ACCEPT;
3516         if (err != NF_ACCEPT)
3517                 goto out;
3518
3519         err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF,
3520                            netif_perm, &ad) ? NF_DROP : NF_ACCEPT;
3521         if (err != NF_ACCEPT)
3522                 goto out;
3523                 
3524         /* Fixme: this lookup is inefficient */
3525         err = security_node_sid(family, addrp, len,
3526                                 &node_sid) ? NF_DROP : NF_ACCEPT;
3527         if (err != NF_ACCEPT)
3528                 goto out;
3529         
3530         err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE,
3531                            node_perm, &ad) ? NF_DROP : NF_ACCEPT;
3532         if (err != NF_ACCEPT)
3533                 goto out;
3534
3535         if (send_perm) {
3536                 u32 port_sid;
3537                 
3538                 /* Fixme: make this more efficient */
3539                 err = security_port_sid(sk->sk_family,
3540                                         sk->sk_type,
3541                                         sk->sk_protocol,
3542                                         ntohs(ad.u.net.dport),
3543                                         &port_sid) ? NF_DROP : NF_ACCEPT;
3544                 if (err != NF_ACCEPT)
3545                         goto out;
3546
3547                 err = avc_has_perm(isec->sid, port_sid, isec->sclass,
3548                                    send_perm, &ad) ? NF_DROP : NF_ACCEPT;
3549         }
3550
3551         if (err != NF_ACCEPT)
3552                 goto out;
3553
3554         err = selinux_xfrm_postroute_last(isec->sid, skb);
3555
3556 out:
3557         return err;
3558 }
3559
3560 static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum,
3561                                                 struct sk_buff **pskb,
3562                                                 const struct net_device *in,
3563                                                 const struct net_device *out,
3564                                                 int (*okfn)(struct sk_buff *))
3565 {
3566         return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET);
3567 }
3568
3569 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3570
3571 static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum,
3572                                                 struct sk_buff **pskb,
3573                                                 const struct net_device *in,
3574                                                 const struct net_device *out,
3575                                                 int (*okfn)(struct sk_buff *))
3576 {
3577         return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET6);
3578 }
3579
3580 #endif  /* IPV6 */
3581
3582 #endif  /* CONFIG_NETFILTER */
3583
3584 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
3585 {
3586         struct task_security_struct *tsec;
3587         struct av_decision avd;
3588         int err;
3589
3590         err = secondary_ops->netlink_send(sk, skb);
3591         if (err)
3592                 return err;
3593
3594         tsec = current->security;
3595
3596         avd.allowed = 0;
3597         avc_has_perm_noaudit(tsec->sid, tsec->sid,
3598                                 SECCLASS_CAPABILITY, ~0, &avd);
3599         cap_mask(NETLINK_CB(skb).eff_cap, avd.allowed);
3600
3601         if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
3602                 err = selinux_nlmsg_perm(sk, skb);
3603
3604         return err;
3605 }
3606
3607 static int selinux_netlink_recv(struct sk_buff *skb)
3608 {
3609         if (!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
3610                 return -EPERM;
3611         return 0;
3612 }
3613
3614 static int ipc_alloc_security(struct task_struct *task,
3615                               struct kern_ipc_perm *perm,
3616                               u16 sclass)
3617 {
3618         struct task_security_struct *tsec = task->security;
3619         struct ipc_security_struct *isec;
3620
3621         isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
3622         if (!isec)
3623                 return -ENOMEM;
3624
3625         isec->sclass = sclass;
3626         isec->ipc_perm = perm;
3627         isec->sid = tsec->sid;
3628         perm->security = isec;
3629
3630         return 0;
3631 }
3632
3633 static void ipc_free_security(struct kern_ipc_perm *perm)
3634 {
3635         struct ipc_security_struct *isec = perm->security;
3636         perm->security = NULL;
3637         kfree(isec);
3638 }
3639
3640 static int msg_msg_alloc_security(struct msg_msg *msg)
3641 {
3642         struct msg_security_struct *msec;
3643
3644         msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
3645         if (!msec)
3646                 return -ENOMEM;
3647
3648         msec->msg = msg;
3649         msec->sid = SECINITSID_UNLABELED;
3650         msg->security = msec;
3651
3652         return 0;
3653 }
3654
3655 static void msg_msg_free_security(struct msg_msg *msg)
3656 {
3657         struct msg_security_struct *msec = msg->security;
3658
3659         msg->security = NULL;
3660         kfree(msec);
3661 }
3662
3663 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
3664                         u32 perms)
3665 {
3666         struct task_security_struct *tsec;
3667         struct ipc_security_struct *isec;
3668         struct avc_audit_data ad;
3669
3670         tsec = current->security;
3671         isec = ipc_perms->security;
3672
3673         AVC_AUDIT_DATA_INIT(&ad, IPC);
3674         ad.u.ipc_id = ipc_perms->key;
3675
3676         return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
3677 }
3678
3679 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
3680 {
3681         return msg_msg_alloc_security(msg);
3682 }
3683
3684 static void selinux_msg_msg_free_security(struct msg_msg *msg)
3685 {
3686         msg_msg_free_security(msg);
3687 }
3688
3689 /* message queue security operations */
3690 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
3691 {
3692         struct task_security_struct *tsec;
3693         struct ipc_security_struct *isec;
3694         struct avc_audit_data ad;
3695         int rc;
3696
3697         rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
3698         if (rc)
3699                 return rc;
3700
3701         tsec = current->security;
3702         isec = msq->q_perm.security;
3703
3704         AVC_AUDIT_DATA_INIT(&ad, IPC);
3705         ad.u.ipc_id = msq->q_perm.key;
3706
3707         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3708                           MSGQ__CREATE, &ad);
3709         if (rc) {
3710                 ipc_free_security(&msq->q_perm);
3711                 return rc;
3712         }
3713         return 0;
3714 }
3715
3716 static void selinux_msg_queue_free_security(struct msg_queue *msq)
3717 {
3718         ipc_free_security(&msq->q_perm);
3719 }
3720
3721 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
3722 {
3723         struct task_security_struct *tsec;
3724         struct ipc_security_struct *isec;
3725         struct avc_audit_data ad;
3726
3727         tsec = current->security;
3728         isec = msq->q_perm.security;
3729
3730         AVC_AUDIT_DATA_INIT(&ad, IPC);
3731         ad.u.ipc_id = msq->q_perm.key;
3732
3733         return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3734                             MSGQ__ASSOCIATE, &ad);
3735 }
3736
3737 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3738 {
3739         int err;
3740         int perms;
3741
3742         switch(cmd) {
3743         case IPC_INFO:
3744         case MSG_INFO:
3745                 /* No specific object, just general system-wide information. */
3746                 return task_has_system(current, SYSTEM__IPC_INFO);
3747         case IPC_STAT:
3748         case MSG_STAT:
3749                 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
3750                 break;
3751         case IPC_SET:
3752                 perms = MSGQ__SETATTR;
3753                 break;
3754         case IPC_RMID:
3755                 perms = MSGQ__DESTROY;
3756                 break;
3757         default:
3758                 return 0;
3759         }
3760
3761         err = ipc_has_perm(&msq->q_perm, perms);
3762         return err;
3763 }
3764
3765 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
3766 {
3767         struct task_security_struct *tsec;
3768         struct ipc_security_struct *isec;
3769         struct msg_security_struct *msec;
3770         struct avc_audit_data ad;
3771         int rc;
3772
3773         tsec = current->security;
3774         isec = msq->q_perm.security;
3775         msec = msg->security;
3776
3777         /*
3778          * First time through, need to assign label to the message
3779          */
3780         if (msec->sid == SECINITSID_UNLABELED) {
3781                 /*
3782                  * Compute new sid based on current process and
3783                  * message queue this message will be stored in
3784                  */
3785                 rc = security_transition_sid(tsec->sid,
3786                                              isec->sid,
3787                                              SECCLASS_MSG,
3788                                              &msec->sid);
3789                 if (rc)
3790                         return rc;
3791         }
3792
3793         AVC_AUDIT_DATA_INIT(&ad, IPC);
3794         ad.u.ipc_id = msq->q_perm.key;
3795
3796         /* Can this process write to the queue? */
3797         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3798                           MSGQ__WRITE, &ad);
3799         if (!rc)
3800                 /* Can this process send the message */
3801                 rc = avc_has_perm(tsec->sid, msec->sid,
3802                                   SECCLASS_MSG, MSG__SEND, &ad);
3803         if (!rc)
3804                 /* Can the message be put in the queue? */
3805                 rc = avc_has_perm(msec->sid, isec->sid,
3806                                   SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);
3807
3808         return rc;
3809 }
3810
3811 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3812                                     struct task_struct *target,
3813                                     long type, int mode)
3814 {
3815         struct task_security_struct *tsec;
3816         struct ipc_security_struct *isec;
3817         struct msg_security_struct *msec;
3818         struct avc_audit_data ad;
3819         int rc;
3820
3821         tsec = target->security;
3822         isec = msq->q_perm.security;
3823         msec = msg->security;
3824
3825         AVC_AUDIT_DATA_INIT(&ad, IPC);
3826         ad.u.ipc_id = msq->q_perm.key;
3827
3828         rc = avc_has_perm(tsec->sid, isec->sid,
3829                           SECCLASS_MSGQ, MSGQ__READ, &ad);
3830         if (!rc)
3831                 rc = avc_has_perm(tsec->sid, msec->sid,
3832                                   SECCLASS_MSG, MSG__RECEIVE, &ad);
3833         return rc;
3834 }
3835
3836 /* Shared Memory security operations */
3837 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
3838 {
3839         struct task_security_struct *tsec;
3840         struct ipc_security_struct *isec;
3841         struct avc_audit_data ad;
3842         int rc;
3843
3844         rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
3845         if (rc)
3846                 return rc;
3847
3848         tsec = current->security;
3849         isec = shp->shm_perm.security;
3850
3851         AVC_AUDIT_DATA_INIT(&ad, IPC);
3852         ad.u.ipc_id = shp->shm_perm.key;
3853
3854         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
3855                           SHM__CREATE, &ad);
3856         if (rc) {
3857                 ipc_free_security(&shp->shm_perm);
3858                 return rc;
3859         }
3860         return 0;
3861 }
3862
3863 static void selinux_shm_free_security(struct shmid_kernel *shp)
3864 {
3865         ipc_free_security(&shp->shm_perm);
3866 }
3867
3868 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
3869 {
3870         struct task_security_struct *tsec;
3871         struct ipc_security_struct *isec;
3872         struct avc_audit_data ad;
3873
3874         tsec = current->security;
3875         isec = shp->shm_perm.security;
3876
3877         AVC_AUDIT_DATA_INIT(&ad, IPC);
3878         ad.u.ipc_id = shp->shm_perm.key;
3879
3880         return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
3881                             SHM__ASSOCIATE, &ad);
3882 }
3883
3884 /* Note, at this point, shp is locked down */
3885 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
3886 {
3887         int perms;
3888         int err;
3889
3890         switch(cmd) {
3891         case IPC_INFO:
3892         case SHM_INFO:
3893                 /* No specific object, just general system-wide information. */
3894                 return task_has_system(current, SYSTEM__IPC_INFO);
3895         case IPC_STAT:
3896         case SHM_STAT:
3897                 perms = SHM__GETATTR | SHM__ASSOCIATE;
3898                 break;
3899         case IPC_SET:
3900                 perms = SHM__SETATTR;
3901                 break;
3902         case SHM_LOCK:
3903         case SHM_UNLOCK:
3904                 perms = SHM__LOCK;
3905                 break;
3906         case IPC_RMID:
3907                 perms = SHM__DESTROY;
3908                 break;
3909         default:
3910                 return 0;
3911         }
3912
3913         err = ipc_has_perm(&shp->shm_perm, perms);
3914         return err;
3915 }
3916
3917 static int selinux_shm_shmat(struct shmid_kernel *shp,
3918                              char __user *shmaddr, int shmflg)
3919 {
3920         u32 perms;
3921         int rc;
3922
3923         rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg);
3924         if (rc)
3925                 return rc;
3926
3927         if (shmflg & SHM_RDONLY)
3928                 perms = SHM__READ;
3929         else
3930                 perms = SHM__READ | SHM__WRITE;
3931
3932         return ipc_has_perm(&shp->shm_perm, perms);
3933 }
3934
3935 /* Semaphore security operations */
3936 static int selinux_sem_alloc_security(struct sem_array *sma)
3937 {
3938         struct task_security_struct *tsec;
3939         struct ipc_security_struct *isec;
3940         struct avc_audit_data ad;
3941         int rc;
3942
3943         rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
3944         if (rc)
3945                 return rc;
3946
3947         tsec = current->security;
3948         isec = sma->sem_perm.security;
3949
3950         AVC_AUDIT_DATA_INIT(&ad, IPC);
3951         ad.u.ipc_id = sma->sem_perm.key;
3952
3953         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
3954                           SEM__CREATE, &ad);
3955         if (rc) {
3956                 ipc_free_security(&sma->sem_perm);
3957                 return rc;
3958         }
3959         return 0;
3960 }
3961
3962 static void selinux_sem_free_security(struct sem_array *sma)
3963 {
3964         ipc_free_security(&sma->sem_perm);
3965 }
3966
3967 static int selinux_sem_associate(struct sem_array *sma, int semflg)
3968 {
3969         struct task_security_struct *tsec;
3970         struct ipc_security_struct *isec;
3971         struct avc_audit_data ad;
3972
3973         tsec = current->security;
3974         isec = sma->sem_perm.security;
3975
3976         AVC_AUDIT_DATA_INIT(&ad, IPC);
3977         ad.u.ipc_id = sma->sem_perm.key;
3978
3979         return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
3980                             SEM__ASSOCIATE, &ad);
3981 }
3982
3983 /* Note, at this point, sma is locked down */
3984 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
3985 {
3986         int err;
3987         u32 perms;
3988
3989         switch(cmd) {
3990         case IPC_INFO:
3991         case SEM_INFO:
3992                 /* No specific object, just general system-wide information. */
3993                 return task_has_system(current, SYSTEM__IPC_INFO);
3994         case GETPID:
3995         case GETNCNT:
3996         case GETZCNT:
3997                 perms = SEM__GETATTR;
3998                 break;
3999         case GETVAL:
4000         case GETALL:
4001                 perms = SEM__READ;
4002                 break;
4003         case SETVAL:
4004         case SETALL:
4005                 perms = SEM__WRITE;
4006                 break;
4007         case IPC_RMID:
4008                 perms = SEM__DESTROY;
4009                 break;
4010         case IPC_SET:
4011                 perms = SEM__SETATTR;
4012                 break;
4013         case IPC_STAT:
4014         case SEM_STAT:
4015                 perms = SEM__GETATTR | SEM__ASSOCIATE;
4016                 break;
4017         default:
4018                 return 0;
4019         }
4020
4021         err = ipc_has_perm(&sma->sem_perm, perms);
4022         return err;
4023 }
4024
4025 static int selinux_sem_semop(struct sem_array *sma,
4026                              struct sembuf *sops, unsigned nsops, int alter)
4027 {
4028         u32 perms;
4029
4030         if (alter)
4031                 perms = SEM__READ | SEM__WRITE;
4032         else
4033                 perms = SEM__READ;
4034
4035         return ipc_has_perm(&sma->sem_perm, perms);
4036 }
4037
4038 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
4039 {
4040         u32 av = 0;
4041
4042         av = 0;
4043         if (flag & S_IRUGO)
4044                 av |= IPC__UNIX_READ;
4045         if (flag & S_IWUGO)
4046                 av |= IPC__UNIX_WRITE;
4047
4048         if (av == 0)
4049                 return 0;
4050
4051         return ipc_has_perm(ipcp, av);
4052 }
4053
4054 /* module stacking operations */
4055 static int selinux_register_security (const char *name, struct security_operations *ops)
4056 {
4057         if (secondary_ops != original_ops) {
4058                 printk(KERN_INFO "%s:  There is already a secondary security "
4059                        "module registered.\n", __FUNCTION__);
4060                 return -EINVAL;
4061         }
4062
4063         secondary_ops = ops;
4064
4065         printk(KERN_INFO "%s:  Registering secondary module %s\n",
4066                __FUNCTION__,
4067                name);
4068
4069         return 0;
4070 }
4071
4072 static int selinux_unregister_security (const char *name, struct security_operations *ops)
4073 {
4074         if (ops != secondary_ops) {
4075                 printk (KERN_INFO "%s:  trying to unregister a security module "
4076                         "that is not registered.\n", __FUNCTION__);
4077                 return -EINVAL;
4078         }
4079
4080         secondary_ops = original_ops;
4081
4082         return 0;
4083 }
4084
4085 static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode)
4086 {
4087         if (inode)
4088                 inode_doinit_with_dentry(inode, dentry);
4089 }
4090
4091 static int selinux_getprocattr(struct task_struct *p,
4092                                char *name, void *value, size_t size)
4093 {
4094         struct task_security_struct *tsec;
4095         u32 sid, len;
4096         char *context;
4097         int error;
4098
4099         if (current != p) {
4100                 error = task_has_perm(current, p, PROCESS__GETATTR);
4101                 if (error)
4102                         return error;
4103         }
4104
4105         if (!size)
4106                 return -ERANGE;
4107
4108         tsec = p->security;
4109
4110         if (!strcmp(name, "current"))
4111                 sid = tsec->sid;
4112         else if (!strcmp(name, "prev"))
4113                 sid = tsec->osid;
4114         else if (!strcmp(name, "exec"))
4115                 sid = tsec->exec_sid;
4116         else if (!strcmp(name, "fscreate"))
4117                 sid = tsec->create_sid;
4118         else
4119                 return -EINVAL;
4120
4121         if (!sid)
4122                 return 0;
4123
4124         error = security_sid_to_context(sid, &context, &len);
4125         if (error)
4126                 return error;
4127         if (len > size) {
4128                 kfree(context);
4129                 return -ERANGE;
4130         }
4131         memcpy(value, context, len);
4132         kfree(context);
4133         return len;
4134 }
4135
4136 static int selinux_setprocattr(struct task_struct *p,
4137                                char *name, void *value, size_t size)
4138 {
4139         struct task_security_struct *tsec;
4140         u32 sid = 0;
4141         int error;
4142         char *str = value;
4143
4144         if (current != p) {
4145                 /* SELinux only allows a process to change its own
4146                    security attributes. */
4147                 return -EACCES;
4148         }
4149
4150         /*
4151          * Basic control over ability to set these attributes at all.
4152          * current == p, but we'll pass them separately in case the
4153          * above restriction is ever removed.
4154          */
4155         if (!strcmp(name, "exec"))
4156                 error = task_has_perm(current, p, PROCESS__SETEXEC);
4157         else if (!strcmp(name, "fscreate"))
4158                 error = task_has_perm(current, p, PROCESS__SETFSCREATE);
4159         else if (!strcmp(name, "current"))
4160                 error = task_has_perm(current, p, PROCESS__SETCURRENT);
4161         else
4162                 error = -EINVAL;
4163         if (error)
4164                 return error;
4165
4166         /* Obtain a SID for the context, if one was specified. */
4167         if (size && str[1] && str[1] != '\n') {
4168                 if (str[size-1] == '\n') {
4169                         str[size-1] = 0;
4170                         size--;
4171                 }
4172                 error = security_context_to_sid(value, size, &sid);
4173                 if (error)
4174                         return error;
4175         }
4176
4177         /* Permission checking based on the specified context is
4178            performed during the actual operation (execve,
4179            open/mkdir/...), when we know the full context of the
4180            operation.  See selinux_bprm_set_security for the execve
4181            checks and may_create for the file creation checks. The
4182            operation will then fail if the context is not permitted. */
4183         tsec = p->security;
4184         if (!strcmp(name, "exec"))
4185                 tsec->exec_sid = sid;
4186         else if (!strcmp(name, "fscreate"))
4187                 tsec->create_sid = sid;
4188         else if (!strcmp(name, "current")) {
4189                 struct av_decision avd;
4190
4191                 if (sid == 0)
4192                         return -EINVAL;
4193
4194                 /* Only allow single threaded processes to change context */
4195                 if (atomic_read(&p->mm->mm_users) != 1) {
4196                         struct task_struct *g, *t;
4197                         struct mm_struct *mm = p->mm;
4198                         read_lock(&tasklist_lock);
4199                         do_each_thread(g, t)
4200                                 if (t->mm == mm && t != p) {
4201                                         read_unlock(&tasklist_lock);
4202                                         return -EPERM;
4203                                 }
4204                         while_each_thread(g, t);
4205                         read_unlock(&tasklist_lock);
4206                 }
4207
4208                 /* Check permissions for the transition. */
4209                 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
4210                                      PROCESS__DYNTRANSITION, NULL);
4211                 if (error)
4212                         return error;
4213
4214                 /* Check for ptracing, and update the task SID if ok.
4215                    Otherwise, leave SID unchanged and fail. */
4216                 task_lock(p);
4217                 if (p->ptrace & PT_PTRACED) {
4218                         error = avc_has_perm_noaudit(tsec->ptrace_sid, sid,
4219                                                      SECCLASS_PROCESS,
4220                                                      PROCESS__PTRACE, &avd);
4221                         if (!error)
4222                                 tsec->sid = sid;
4223                         task_unlock(p);
4224                         avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS,
4225                                   PROCESS__PTRACE, &avd, error, NULL);
4226                         if (error)
4227                                 return error;
4228                 } else {
4229                         tsec->sid = sid;
4230                         task_unlock(p);
4231                 }
4232         }
4233         else
4234                 return -EINVAL;
4235
4236         return size;
4237 }
4238
4239 static struct security_operations selinux_ops = {
4240         .ptrace =                       selinux_ptrace,
4241         .capget =                       selinux_capget,
4242         .capset_check =                 selinux_capset_check,
4243         .capset_set =                   selinux_capset_set,
4244         .sysctl =                       selinux_sysctl,
4245         .capable =                      selinux_capable,
4246         .quotactl =                     selinux_quotactl,
4247         .quota_on =                     selinux_quota_on,
4248         .syslog =                       selinux_syslog,
4249         .vm_enough_memory =             selinux_vm_enough_memory,
4250
4251         .netlink_send =                 selinux_netlink_send,
4252         .netlink_recv =                 selinux_netlink_recv,
4253
4254         .bprm_alloc_security =          selinux_bprm_alloc_security,
4255         .bprm_free_security =           selinux_bprm_free_security,
4256         .bprm_apply_creds =             selinux_bprm_apply_creds,
4257         .bprm_post_apply_creds =        selinux_bprm_post_apply_creds,
4258         .bprm_set_security =            selinux_bprm_set_security,
4259         .bprm_check_security =          selinux_bprm_check_security,
4260         .bprm_secureexec =              selinux_bprm_secureexec,
4261
4262         .sb_alloc_security =            selinux_sb_alloc_security,
4263         .sb_free_security =             selinux_sb_free_security,
4264         .sb_copy_data =                 selinux_sb_copy_data,
4265         .sb_kern_mount =                selinux_sb_kern_mount,
4266         .sb_statfs =                    selinux_sb_statfs,
4267         .sb_mount =                     selinux_mount,
4268         .sb_umount =                    selinux_umount,
4269
4270         .inode_alloc_security =         selinux_inode_alloc_security,
4271         .inode_free_security =          selinux_inode_free_security,
4272         .inode_init_security =          selinux_inode_init_security,
4273         .inode_create =                 selinux_inode_create,
4274         .inode_link =                   selinux_inode_link,
4275         .inode_unlink =                 selinux_inode_unlink,
4276         .inode_symlink =                selinux_inode_symlink,
4277         .inode_mkdir =                  selinux_inode_mkdir,
4278         .inode_rmdir =                  selinux_inode_rmdir,
4279         .inode_mknod =                  selinux_inode_mknod,
4280         .inode_rename =                 selinux_inode_rename,
4281         .inode_readlink =               selinux_inode_readlink,
4282         .inode_follow_link =            selinux_inode_follow_link,
4283         .inode_permission =             selinux_inode_permission,
4284         .inode_setattr =                selinux_inode_setattr,
4285         .inode_getattr =                selinux_inode_getattr,
4286         .inode_setxattr =               selinux_inode_setxattr,
4287         .inode_post_setxattr =          selinux_inode_post_setxattr,
4288         .inode_getxattr =               selinux_inode_getxattr,
4289         .inode_listxattr =              selinux_inode_listxattr,
4290         .inode_removexattr =            selinux_inode_removexattr,
4291         .inode_getsecurity =            selinux_inode_getsecurity,
4292         .inode_setsecurity =            selinux_inode_setsecurity,
4293         .inode_listsecurity =           selinux_inode_listsecurity,
4294
4295         .file_permission =              selinux_file_permission,
4296         .file_alloc_security =          selinux_file_alloc_security,
4297         .file_free_security =           selinux_file_free_security,
4298         .file_ioctl =                   selinux_file_ioctl,
4299         .file_mmap =                    selinux_file_mmap,
4300         .file_mprotect =                selinux_file_mprotect,
4301         .file_lock =                    selinux_file_lock,
4302         .file_fcntl =                   selinux_file_fcntl,
4303         .file_set_fowner =              selinux_file_set_fowner,
4304         .file_send_sigiotask =          selinux_file_send_sigiotask,
4305         .file_receive =                 selinux_file_receive,
4306
4307         .task_create =                  selinux_task_create,
4308         .task_alloc_security =          selinux_task_alloc_security,
4309         .task_free_security =           selinux_task_free_security,
4310         .task_setuid =                  selinux_task_setuid,
4311         .task_post_setuid =             selinux_task_post_setuid,
4312         .task_setgid =                  selinux_task_setgid,
4313         .task_setpgid =                 selinux_task_setpgid,
4314         .task_getpgid =                 selinux_task_getpgid,
4315         .task_getsid =                  selinux_task_getsid,
4316         .task_setgroups =               selinux_task_setgroups,
4317         .task_setnice =                 selinux_task_setnice,
4318         .task_setrlimit =               selinux_task_setrlimit,
4319         .task_setscheduler =            selinux_task_setscheduler,
4320         .task_getscheduler =            selinux_task_getscheduler,
4321         .task_kill =                    selinux_task_kill,
4322         .task_wait =                    selinux_task_wait,
4323         .task_prctl =                   selinux_task_prctl,
4324         .task_reparent_to_init =        selinux_task_reparent_to_init,
4325         .task_to_inode =                selinux_task_to_inode,
4326
4327         .ipc_permission =               selinux_ipc_permission,
4328
4329         .msg_msg_alloc_security =       selinux_msg_msg_alloc_security,
4330         .msg_msg_free_security =        selinux_msg_msg_free_security,
4331
4332         .msg_queue_alloc_security =     selinux_msg_queue_alloc_security,
4333         .msg_queue_free_security =      selinux_msg_queue_free_security,
4334         .msg_queue_associate =          selinux_msg_queue_associate,
4335         .msg_queue_msgctl =             selinux_msg_queue_msgctl,
4336         .msg_queue_msgsnd =             selinux_msg_queue_msgsnd,
4337         .msg_queue_msgrcv =             selinux_msg_queue_msgrcv,
4338
4339         .shm_alloc_security =           selinux_shm_alloc_security,
4340         .shm_free_security =            selinux_shm_free_security,
4341         .shm_associate =                selinux_shm_associate,
4342         .shm_shmctl =                   selinux_shm_shmctl,
4343         .shm_shmat =                    selinux_shm_shmat,
4344
4345         .sem_alloc_security =           selinux_sem_alloc_security,
4346         .sem_free_security =            selinux_sem_free_security,
4347         .sem_associate =                selinux_sem_associate,
4348         .sem_semctl =                   selinux_sem_semctl,
4349         .sem_semop =                    selinux_sem_semop,
4350
4351         .register_security =            selinux_register_security,
4352         .unregister_security =          selinux_unregister_security,
4353
4354         .d_instantiate =                selinux_d_instantiate,
4355
4356         .getprocattr =                  selinux_getprocattr,
4357         .setprocattr =                  selinux_setprocattr,
4358
4359         .unix_stream_connect =          selinux_socket_unix_stream_connect,
4360         .unix_may_send =                selinux_socket_unix_may_send,
4361
4362         .socket_create =                selinux_socket_create,
4363         .socket_post_create =           selinux_socket_post_create,
4364         .socket_bind =                  selinux_socket_bind,
4365         .socket_connect =               selinux_socket_connect,
4366         .socket_listen =                selinux_socket_listen,
4367         .socket_accept =                selinux_socket_accept,
4368         .socket_sendmsg =               selinux_socket_sendmsg,
4369         .socket_recvmsg =               selinux_socket_recvmsg,
4370         .socket_getsockname =           selinux_socket_getsockname,
4371         .socket_getpeername =           selinux_socket_getpeername,
4372         .socket_getsockopt =            selinux_socket_getsockopt,
4373         .socket_setsockopt =            selinux_socket_setsockopt,
4374         .socket_shutdown =              selinux_socket_shutdown,
4375         .socket_sock_rcv_skb =          selinux_socket_sock_rcv_skb,
4376         .socket_getpeersec_stream =     selinux_socket_getpeersec_stream,
4377         .socket_getpeersec_dgram =      selinux_socket_getpeersec_dgram,
4378         .sk_alloc_security =            selinux_sk_alloc_security,
4379         .sk_free_security =             selinux_sk_free_security,
4380         .sk_getsid =                    selinux_sk_getsid_security,
4381
4382 #ifdef CONFIG_SECURITY_NETWORK_XFRM
4383         .xfrm_policy_alloc_security =   selinux_xfrm_policy_alloc,
4384         .xfrm_policy_clone_security =   selinux_xfrm_policy_clone,
4385         .xfrm_policy_free_security =    selinux_xfrm_policy_free,
4386         .xfrm_state_alloc_security =    selinux_xfrm_state_alloc,
4387         .xfrm_state_free_security =     selinux_xfrm_state_free,
4388         .xfrm_policy_lookup =           selinux_xfrm_policy_lookup,
4389 #endif
4390 };
4391
4392 static __init int selinux_init(void)
4393 {
4394         struct task_security_struct *tsec;
4395
4396         if (!selinux_enabled) {
4397                 printk(KERN_INFO "SELinux:  Disabled at boot.\n");
4398                 return 0;
4399         }
4400
4401         printk(KERN_INFO "SELinux:  Initializing.\n");
4402
4403         /* Set the security state for the initial task. */
4404         if (task_alloc_security(current))
4405                 panic("SELinux:  Failed to initialize initial task.\n");
4406         tsec = current->security;
4407         tsec->osid = tsec->sid = SECINITSID_KERNEL;
4408
4409         avc_init();
4410
4411         original_ops = secondary_ops = security_ops;
4412         if (!secondary_ops)
4413                 panic ("SELinux: No initial security operations\n");
4414         if (register_security (&selinux_ops))
4415                 panic("SELinux: Unable to register with kernel.\n");
4416
4417         if (selinux_enforcing) {
4418                 printk(KERN_INFO "SELinux:  Starting in enforcing mode\n");
4419         } else {
4420                 printk(KERN_INFO "SELinux:  Starting in permissive mode\n");
4421         }
4422         return 0;
4423 }
4424
4425 void selinux_complete_init(void)
4426 {
4427         printk(KERN_INFO "SELinux:  Completing initialization.\n");
4428
4429         /* Set up any superblocks initialized prior to the policy load. */
4430         printk(KERN_INFO "SELinux:  Setting up existing superblocks.\n");
4431         spin_lock(&sb_security_lock);
4432 next_sb:
4433         if (!list_empty(&superblock_security_head)) {
4434                 struct superblock_security_struct *sbsec =
4435                                 list_entry(superblock_security_head.next,
4436                                            struct superblock_security_struct,
4437                                            list);
4438                 struct super_block *sb = sbsec->sb;
4439                 spin_lock(&sb_lock);
4440                 sb->s_count++;
4441                 spin_unlock(&sb_lock);
4442                 spin_unlock(&sb_security_lock);
4443                 down_read(&sb->s_umount);
4444                 if (sb->s_root)
4445                         superblock_doinit(sb, NULL);
4446                 drop_super(sb);
4447                 spin_lock(&sb_security_lock);
4448                 list_del_init(&sbsec->list);
4449                 goto next_sb;
4450         }
4451         spin_unlock(&sb_security_lock);
4452 }
4453
4454 /* SELinux requires early initialization in order to label
4455    all processes and objects when they are created. */
4456 security_initcall(selinux_init);
4457
4458 #if defined(CONFIG_NETFILTER)
4459
4460 static struct nf_hook_ops selinux_ipv4_op = {
4461         .hook =         selinux_ipv4_postroute_last,
4462         .owner =        THIS_MODULE,
4463         .pf =           PF_INET,
4464         .hooknum =      NF_IP_POST_ROUTING,
4465         .priority =     NF_IP_PRI_SELINUX_LAST,
4466 };
4467
4468 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4469
4470 static struct nf_hook_ops selinux_ipv6_op = {
4471         .hook =         selinux_ipv6_postroute_last,
4472         .owner =        THIS_MODULE,
4473         .pf =           PF_INET6,
4474         .hooknum =      NF_IP6_POST_ROUTING,
4475         .priority =     NF_IP6_PRI_SELINUX_LAST,
4476 };
4477
4478 #endif  /* IPV6 */
4479
4480 static int __init selinux_nf_ip_init(void)
4481 {
4482         int err = 0;
4483
4484         if (!selinux_enabled)
4485                 goto out;
4486                 
4487         printk(KERN_INFO "SELinux:  Registering netfilter hooks\n");
4488         
4489         err = nf_register_hook(&selinux_ipv4_op);
4490         if (err)
4491                 panic("SELinux: nf_register_hook for IPv4: error %d\n", err);
4492
4493 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4494
4495         err = nf_register_hook(&selinux_ipv6_op);
4496         if (err)
4497                 panic("SELinux: nf_register_hook for IPv6: error %d\n", err);
4498
4499 #endif  /* IPV6 */
4500
4501 out:
4502         return err;
4503 }
4504
4505 __initcall(selinux_nf_ip_init);
4506
4507 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4508 static void selinux_nf_ip_exit(void)
4509 {
4510         printk(KERN_INFO "SELinux:  Unregistering netfilter hooks\n");
4511
4512         nf_unregister_hook(&selinux_ipv4_op);
4513 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4514         nf_unregister_hook(&selinux_ipv6_op);
4515 #endif  /* IPV6 */
4516 }
4517 #endif
4518
4519 #else /* CONFIG_NETFILTER */
4520
4521 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4522 #define selinux_nf_ip_exit()
4523 #endif
4524
4525 #endif /* CONFIG_NETFILTER */
4526
4527 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4528 int selinux_disable(void)
4529 {
4530         extern void exit_sel_fs(void);
4531         static int selinux_disabled = 0;
4532
4533         if (ss_initialized) {
4534                 /* Not permitted after initial policy load. */
4535                 return -EINVAL;
4536         }
4537
4538         if (selinux_disabled) {
4539                 /* Only do this once. */
4540                 return -EINVAL;
4541         }
4542
4543         printk(KERN_INFO "SELinux:  Disabled at runtime.\n");
4544
4545         selinux_disabled = 1;
4546
4547         /* Reset security_ops to the secondary module, dummy or capability. */
4548         security_ops = secondary_ops;
4549
4550         /* Unregister netfilter hooks. */
4551         selinux_nf_ip_exit();
4552
4553         /* Unregister selinuxfs. */
4554         exit_sel_fs();
4555
4556         return 0;
4557 }
4558 #endif
4559
4560