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firewire: ohci: fix buffer overflow in AR split packet handling
[firewire-audio.git] / security / selinux / hooks.c
blob4796ddd4e721ae454a02563d713aa235870ece02
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) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Eric Paris <eparis@redhat.com>
14 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
15 * <dgoeddel@trustedcs.com>
16 * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P.
17 * Paul Moore <paul.moore@hp.com>
18 * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
19 * Yuichi Nakamura <ynakam@hitachisoft.jp>
20 *
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License version 2,
23 * as published by the Free Software Foundation.
24 */
25
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/tracehook.h>
29 #include <linux/errno.h>
30 #include <linux/sched.h>
31 #include <linux/security.h>
32 #include <linux/xattr.h>
33 #include <linux/capability.h>
34 #include <linux/unistd.h>
35 #include <linux/mm.h>
36 #include <linux/mman.h>
37 #include <linux/slab.h>
38 #include <linux/pagemap.h>
39 #include <linux/swap.h>
40 #include <linux/spinlock.h>
41 #include <linux/syscalls.h>
42 #include <linux/file.h>
43 #include <linux/fdtable.h>
44 #include <linux/namei.h>
45 #include <linux/mount.h>
46 #include <linux/proc_fs.h>
47 #include <linux/netfilter_ipv4.h>
48 #include <linux/netfilter_ipv6.h>
49 #include <linux/tty.h>
50 #include <net/icmp.h>
51 #include <net/ip.h> /* for local_port_range[] */
52 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
53 #include <net/net_namespace.h>
54 #include <net/netlabel.h>
55 #include <linux/uaccess.h>
56 #include <asm/ioctls.h>
57 #include <asm/atomic.h>
58 #include <linux/bitops.h>
59 #include <linux/interrupt.h>
60 #include <linux/netdevice.h> /* for network interface checks */
61 #include <linux/netlink.h>
62 #include <linux/tcp.h>
63 #include <linux/udp.h>
64 #include <linux/dccp.h>
65 #include <linux/quota.h>
66 #include <linux/un.h> /* for Unix socket types */
67 #include <net/af_unix.h> /* for Unix socket types */
68 #include <linux/parser.h>
69 #include <linux/nfs_mount.h>
70 #include <net/ipv6.h>
71 #include <linux/hugetlb.h>
72 #include <linux/personality.h>
73 #include <linux/sysctl.h>
74 #include <linux/audit.h>
75 #include <linux/string.h>
76 #include <linux/selinux.h>
77 #include <linux/mutex.h>
78 #include <linux/posix-timers.h>
79 #include <linux/syslog.h>
80
81 #include "avc.h"
82 #include "objsec.h"
83 #include "netif.h"
84 #include "netnode.h"
85 #include "netport.h"
86 #include "xfrm.h"
87 #include "netlabel.h"
88 #include "audit.h"
89
90 #define NUM_SEL_MNT_OPTS 5
91
92 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
93 extern struct security_operations *security_ops;
94
95 /* SECMARK reference count */
96 atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
97
98 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
99 int selinux_enforcing;
100
101 static int __init enforcing_setup(char *str)
102 {
103 unsigned long enforcing;
104 if (!strict_strtoul(str, 0, &enforcing))
105 selinux_enforcing = enforcing ? 1 : 0;
106 return 1;
107 }
108 __setup("enforcing=", enforcing_setup);
109 #endif
110
111 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
112 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
113
114 static int __init selinux_enabled_setup(char *str)
115 {
116 unsigned long enabled;
117 if (!strict_strtoul(str, 0, &enabled))
118 selinux_enabled = enabled ? 1 : 0;
119 return 1;
120 }
121 __setup("selinux=", selinux_enabled_setup);
122 #else
123 int selinux_enabled = 1;
124 #endif
125
126 static struct kmem_cache *sel_inode_cache;
127
128 /**
129 * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
130 *
131 * Description:
132 * This function checks the SECMARK reference counter to see if any SECMARK
133 * targets are currently configured, if the reference counter is greater than
134 * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
135 * enabled, false (0) if SECMARK is disabled.
136 *
137 */
138 static int selinux_secmark_enabled(void)
139 {
140 return (atomic_read(&selinux_secmark_refcount) > 0);
141 }
142
143 /*
144 * initialise the security for the init task
145 */
146 static void cred_init_security(void)
147 {
148 struct cred *cred = (struct cred *) current->real_cred;
149 struct task_security_struct *tsec;
150
151 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
152 if (!tsec)
153 panic("SELinux: Failed to initialize initial task.\n");
154
155 tsec->osid = tsec->sid = SECINITSID_KERNEL;
156 cred->security = tsec;
157 }
158
159 /*
160 * get the security ID of a set of credentials
161 */
162 static inline u32 cred_sid(const struct cred *cred)
163 {
164 const struct task_security_struct *tsec;
165
166 tsec = cred->security;
167 return tsec->sid;
168 }
169
170 /*
171 * get the objective security ID of a task
172 */
173 static inline u32 task_sid(const struct task_struct *task)
174 {
175 u32 sid;
176
177 rcu_read_lock();
178 sid = cred_sid(__task_cred(task));
179 rcu_read_unlock();
180 return sid;
181 }
182
183 /*
184 * get the subjective security ID of the current task
185 */
186 static inline u32 current_sid(void)
187 {
188 const struct task_security_struct *tsec = current_security();
189
190 return tsec->sid;
191 }
192
193 /* Allocate and free functions for each kind of security blob. */
194
195 static int inode_alloc_security(struct inode *inode)
196 {
197 struct inode_security_struct *isec;
198 u32 sid = current_sid();
199
200 isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
201 if (!isec)
202 return -ENOMEM;
203
204 mutex_init(&isec->lock);
205 INIT_LIST_HEAD(&isec->list);
206 isec->inode = inode;
207 isec->sid = SECINITSID_UNLABELED;
208 isec->sclass = SECCLASS_FILE;
209 isec->task_sid = sid;
210 inode->i_security = isec;
211
212 return 0;
213 }
214
215 static void inode_free_security(struct inode *inode)
216 {
217 struct inode_security_struct *isec = inode->i_security;
218 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
219
220 spin_lock(&sbsec->isec_lock);
221 if (!list_empty(&isec->list))
222 list_del_init(&isec->list);
223 spin_unlock(&sbsec->isec_lock);
224
225 inode->i_security = NULL;
226 kmem_cache_free(sel_inode_cache, isec);
227 }
228
229 static int file_alloc_security(struct file *file)
230 {
231 struct file_security_struct *fsec;
232 u32 sid = current_sid();
233
234 fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
235 if (!fsec)
236 return -ENOMEM;
237
238 fsec->sid = sid;
239 fsec->fown_sid = sid;
240 file->f_security = fsec;
241
242 return 0;
243 }
244
245 static void file_free_security(struct file *file)
246 {
247 struct file_security_struct *fsec = file->f_security;
248 file->f_security = NULL;
249 kfree(fsec);
250 }
251
252 static int superblock_alloc_security(struct super_block *sb)
253 {
254 struct superblock_security_struct *sbsec;
255
256 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
257 if (!sbsec)
258 return -ENOMEM;
259
260 mutex_init(&sbsec->lock);
261 INIT_LIST_HEAD(&sbsec->isec_head);
262 spin_lock_init(&sbsec->isec_lock);
263 sbsec->sb = sb;
264 sbsec->sid = SECINITSID_UNLABELED;
265 sbsec->def_sid = SECINITSID_FILE;
266 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
267 sb->s_security = sbsec;
268
269 return 0;
270 }
271
272 static void superblock_free_security(struct super_block *sb)
273 {
274 struct superblock_security_struct *sbsec = sb->s_security;
275 sb->s_security = NULL;
276 kfree(sbsec);
277 }
278
279 /* The security server must be initialized before
280 any labeling or access decisions can be provided. */
281 extern int ss_initialized;
282
283 /* The file system's label must be initialized prior to use. */
284
285 static const char *labeling_behaviors[6] = {
286 "uses xattr",
287 "uses transition SIDs",
288 "uses task SIDs",
289 "uses genfs_contexts",
290 "not configured for labeling",
291 "uses mountpoint labeling",
292 };
293
294 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
295
296 static inline int inode_doinit(struct inode *inode)
297 {
298 return inode_doinit_with_dentry(inode, NULL);
299 }
300
301 enum {
302 Opt_error = -1,
303 Opt_context = 1,
304 Opt_fscontext = 2,
305 Opt_defcontext = 3,
306 Opt_rootcontext = 4,
307 Opt_labelsupport = 5,
308 };
309
310 static const match_table_t tokens = {
311 {Opt_context, CONTEXT_STR "%s"},
312 {Opt_fscontext, FSCONTEXT_STR "%s"},
313 {Opt_defcontext, DEFCONTEXT_STR "%s"},
314 {Opt_rootcontext, ROOTCONTEXT_STR "%s"},
315 {Opt_labelsupport, LABELSUPP_STR},
316 {Opt_error, NULL},
317 };
318
319 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
320
321 static int may_context_mount_sb_relabel(u32 sid,
322 struct superblock_security_struct *sbsec,
323 const struct cred *cred)
324 {
325 const struct task_security_struct *tsec = cred->security;
326 int rc;
327
328 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
329 FILESYSTEM__RELABELFROM, NULL);
330 if (rc)
331 return rc;
332
333 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
334 FILESYSTEM__RELABELTO, NULL);
335 return rc;
336 }
337
338 static int may_context_mount_inode_relabel(u32 sid,
339 struct superblock_security_struct *sbsec,
340 const struct cred *cred)
341 {
342 const struct task_security_struct *tsec = cred->security;
343 int rc;
344 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
345 FILESYSTEM__RELABELFROM, NULL);
346 if (rc)
347 return rc;
348
349 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
350 FILESYSTEM__ASSOCIATE, NULL);
351 return rc;
352 }
353
354 static int sb_finish_set_opts(struct super_block *sb)
355 {
356 struct superblock_security_struct *sbsec = sb->s_security;
357 struct dentry *root = sb->s_root;
358 struct inode *root_inode = root->d_inode;
359 int rc = 0;
360
361 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
362 /* Make sure that the xattr handler exists and that no
363 error other than -ENODATA is returned by getxattr on
364 the root directory. -ENODATA is ok, as this may be
365 the first boot of the SELinux kernel before we have
366 assigned xattr values to the filesystem. */
367 if (!root_inode->i_op->getxattr) {
368 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
369 "xattr support\n", sb->s_id, sb->s_type->name);
370 rc = -EOPNOTSUPP;
371 goto out;
372 }
373 rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
374 if (rc < 0 && rc != -ENODATA) {
375 if (rc == -EOPNOTSUPP)
376 printk(KERN_WARNING "SELinux: (dev %s, type "
377 "%s) has no security xattr handler\n",
378 sb->s_id, sb->s_type->name);
379 else
380 printk(KERN_WARNING "SELinux: (dev %s, type "
381 "%s) getxattr errno %d\n", sb->s_id,
382 sb->s_type->name, -rc);
383 goto out;
384 }
385 }
386
387 sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP);
388
389 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
390 printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
391 sb->s_id, sb->s_type->name);
392 else
393 printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
394 sb->s_id, sb->s_type->name,
395 labeling_behaviors[sbsec->behavior-1]);
396
397 if (sbsec->behavior == SECURITY_FS_USE_GENFS ||
398 sbsec->behavior == SECURITY_FS_USE_MNTPOINT ||
399 sbsec->behavior == SECURITY_FS_USE_NONE ||
400 sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
401 sbsec->flags &= ~SE_SBLABELSUPP;
402
403 /* Special handling for sysfs. Is genfs but also has setxattr handler*/
404 if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
405 sbsec->flags |= SE_SBLABELSUPP;
406
407 /* Initialize the root inode. */
408 rc = inode_doinit_with_dentry(root_inode, root);
409
410 /* Initialize any other inodes associated with the superblock, e.g.
411 inodes created prior to initial policy load or inodes created
412 during get_sb by a pseudo filesystem that directly
413 populates itself. */
414 spin_lock(&sbsec->isec_lock);
415 next_inode:
416 if (!list_empty(&sbsec->isec_head)) {
417 struct inode_security_struct *isec =
418 list_entry(sbsec->isec_head.next,
419 struct inode_security_struct, list);
420 struct inode *inode = isec->inode;
421 spin_unlock(&sbsec->isec_lock);
422 inode = igrab(inode);
423 if (inode) {
424 if (!IS_PRIVATE(inode))
425 inode_doinit(inode);
426 iput(inode);
427 }
428 spin_lock(&sbsec->isec_lock);
429 list_del_init(&isec->list);
430 goto next_inode;
431 }
432 spin_unlock(&sbsec->isec_lock);
433 out:
434 return rc;
435 }
436
437 /*
438 * This function should allow an FS to ask what it's mount security
439 * options were so it can use those later for submounts, displaying
440 * mount options, or whatever.
441 */
442 static int selinux_get_mnt_opts(const struct super_block *sb,
443 struct security_mnt_opts *opts)
444 {
445 int rc = 0, i;
446 struct superblock_security_struct *sbsec = sb->s_security;
447 char *context = NULL;
448 u32 len;
449 char tmp;
450
451 security_init_mnt_opts(opts);
452
453 if (!(sbsec->flags & SE_SBINITIALIZED))
454 return -EINVAL;
455
456 if (!ss_initialized)
457 return -EINVAL;
458
459 tmp = sbsec->flags & SE_MNTMASK;
460 /* count the number of mount options for this sb */
461 for (i = 0; i < 8; i++) {
462 if (tmp & 0x01)
463 opts->num_mnt_opts++;
464 tmp >>= 1;
465 }
466 /* Check if the Label support flag is set */
467 if (sbsec->flags & SE_SBLABELSUPP)
468 opts->num_mnt_opts++;
469
470 opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
471 if (!opts->mnt_opts) {
472 rc = -ENOMEM;
473 goto out_free;
474 }
475
476 opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC);
477 if (!opts->mnt_opts_flags) {
478 rc = -ENOMEM;
479 goto out_free;
480 }
481
482 i = 0;
483 if (sbsec->flags & FSCONTEXT_MNT) {
484 rc = security_sid_to_context(sbsec->sid, &context, &len);
485 if (rc)
486 goto out_free;
487 opts->mnt_opts[i] = context;
488 opts->mnt_opts_flags[i++] = FSCONTEXT_MNT;
489 }
490 if (sbsec->flags & CONTEXT_MNT) {
491 rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
492 if (rc)
493 goto out_free;
494 opts->mnt_opts[i] = context;
495 opts->mnt_opts_flags[i++] = CONTEXT_MNT;
496 }
497 if (sbsec->flags & DEFCONTEXT_MNT) {
498 rc = security_sid_to_context(sbsec->def_sid, &context, &len);
499 if (rc)
500 goto out_free;
501 opts->mnt_opts[i] = context;
502 opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
503 }
504 if (sbsec->flags & ROOTCONTEXT_MNT) {
505 struct inode *root = sbsec->sb->s_root->d_inode;
506 struct inode_security_struct *isec = root->i_security;
507
508 rc = security_sid_to_context(isec->sid, &context, &len);
509 if (rc)
510 goto out_free;
511 opts->mnt_opts[i] = context;
512 opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
513 }
514 if (sbsec->flags & SE_SBLABELSUPP) {
515 opts->mnt_opts[i] = NULL;
516 opts->mnt_opts_flags[i++] = SE_SBLABELSUPP;
517 }
518
519 BUG_ON(i != opts->num_mnt_opts);
520
521 return 0;
522
523 out_free:
524 security_free_mnt_opts(opts);
525 return rc;
526 }
527
528 static int bad_option(struct superblock_security_struct *sbsec, char flag,
529 u32 old_sid, u32 new_sid)
530 {
531 char mnt_flags = sbsec->flags & SE_MNTMASK;
532
533 /* check if the old mount command had the same options */
534 if (sbsec->flags & SE_SBINITIALIZED)
535 if (!(sbsec->flags & flag) ||
536 (old_sid != new_sid))
537 return 1;
538
539 /* check if we were passed the same options twice,
540 * aka someone passed context=a,context=b
541 */
542 if (!(sbsec->flags & SE_SBINITIALIZED))
543 if (mnt_flags & flag)
544 return 1;
545 return 0;
546 }
547
548 /*
549 * Allow filesystems with binary mount data to explicitly set mount point
550 * labeling information.
551 */
552 static int selinux_set_mnt_opts(struct super_block *sb,
553 struct security_mnt_opts *opts)
554 {
555 const struct cred *cred = current_cred();
556 int rc = 0, i;
557 struct superblock_security_struct *sbsec = sb->s_security;
558 const char *name = sb->s_type->name;
559 struct inode *inode = sbsec->sb->s_root->d_inode;
560 struct inode_security_struct *root_isec = inode->i_security;
561 u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
562 u32 defcontext_sid = 0;
563 char **mount_options = opts->mnt_opts;
564 int *flags = opts->mnt_opts_flags;
565 int num_opts = opts->num_mnt_opts;
566
567 mutex_lock(&sbsec->lock);
568
569 if (!ss_initialized) {
570 if (!num_opts) {
571 /* Defer initialization until selinux_complete_init,
572 after the initial policy is loaded and the security
573 server is ready to handle calls. */
574 goto out;
575 }
576 rc = -EINVAL;
577 printk(KERN_WARNING "SELinux: Unable to set superblock options "
578 "before the security server is initialized\n");
579 goto out;
580 }
581
582 /*
583 * Binary mount data FS will come through this function twice. Once
584 * from an explicit call and once from the generic calls from the vfs.
585 * Since the generic VFS calls will not contain any security mount data
586 * we need to skip the double mount verification.
587 *
588 * This does open a hole in which we will not notice if the first
589 * mount using this sb set explict options and a second mount using
590 * this sb does not set any security options. (The first options
591 * will be used for both mounts)
592 */
593 if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
594 && (num_opts == 0))
595 goto out;
596
597 /*
598 * parse the mount options, check if they are valid sids.
599 * also check if someone is trying to mount the same sb more
600 * than once with different security options.
601 */
602 for (i = 0; i < num_opts; i++) {
603 u32 sid;
604
605 if (flags[i] == SE_SBLABELSUPP)
606 continue;
607 rc = security_context_to_sid(mount_options[i],
608 strlen(mount_options[i]), &sid);
609 if (rc) {
610 printk(KERN_WARNING "SELinux: security_context_to_sid"
611 "(%s) failed for (dev %s, type %s) errno=%d\n",
612 mount_options[i], sb->s_id, name, rc);
613 goto out;
614 }
615 switch (flags[i]) {
616 case FSCONTEXT_MNT:
617 fscontext_sid = sid;
618
619 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
620 fscontext_sid))
621 goto out_double_mount;
622
623 sbsec->flags |= FSCONTEXT_MNT;
624 break;
625 case CONTEXT_MNT:
626 context_sid = sid;
627
628 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
629 context_sid))
630 goto out_double_mount;
631
632 sbsec->flags |= CONTEXT_MNT;
633 break;
634 case ROOTCONTEXT_MNT:
635 rootcontext_sid = sid;
636
637 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
638 rootcontext_sid))
639 goto out_double_mount;
640
641 sbsec->flags |= ROOTCONTEXT_MNT;
642
643 break;
644 case DEFCONTEXT_MNT:
645 defcontext_sid = sid;
646
647 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
648 defcontext_sid))
649 goto out_double_mount;
650
651 sbsec->flags |= DEFCONTEXT_MNT;
652
653 break;
654 default:
655 rc = -EINVAL;
656 goto out;
657 }
658 }
659
660 if (sbsec->flags & SE_SBINITIALIZED) {
661 /* previously mounted with options, but not on this attempt? */
662 if ((sbsec->flags & SE_MNTMASK) && !num_opts)
663 goto out_double_mount;
664 rc = 0;
665 goto out;
666 }
667
668 if (strcmp(sb->s_type->name, "proc") == 0)
669 sbsec->flags |= SE_SBPROC;
670
671 /* Determine the labeling behavior to use for this filesystem type. */
672 rc = security_fs_use((sbsec->flags & SE_SBPROC) ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid);
673 if (rc) {
674 printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
675 __func__, sb->s_type->name, rc);
676 goto out;
677 }
678
679 /* sets the context of the superblock for the fs being mounted. */
680 if (fscontext_sid) {
681 rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
682 if (rc)
683 goto out;
684
685 sbsec->sid = fscontext_sid;
686 }
687
688 /*
689 * Switch to using mount point labeling behavior.
690 * sets the label used on all file below the mountpoint, and will set
691 * the superblock context if not already set.
692 */
693 if (context_sid) {
694 if (!fscontext_sid) {
695 rc = may_context_mount_sb_relabel(context_sid, sbsec,
696 cred);
697 if (rc)
698 goto out;
699 sbsec->sid = context_sid;
700 } else {
701 rc = may_context_mount_inode_relabel(context_sid, sbsec,
702 cred);
703 if (rc)
704 goto out;
705 }
706 if (!rootcontext_sid)
707 rootcontext_sid = context_sid;
708
709 sbsec->mntpoint_sid = context_sid;
710 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
711 }
712
713 if (rootcontext_sid) {
714 rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
715 cred);
716 if (rc)
717 goto out;
718
719 root_isec->sid = rootcontext_sid;
720 root_isec->initialized = 1;
721 }
722
723 if (defcontext_sid) {
724 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
725 rc = -EINVAL;
726 printk(KERN_WARNING "SELinux: defcontext option is "
727 "invalid for this filesystem type\n");
728 goto out;
729 }
730
731 if (defcontext_sid != sbsec->def_sid) {
732 rc = may_context_mount_inode_relabel(defcontext_sid,
733 sbsec, cred);
734 if (rc)
735 goto out;
736 }
737
738 sbsec->def_sid = defcontext_sid;
739 }
740
741 rc = sb_finish_set_opts(sb);
742 out:
743 mutex_unlock(&sbsec->lock);
744 return rc;
745 out_double_mount:
746 rc = -EINVAL;
747 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different "
748 "security settings for (dev %s, type %s)\n", sb->s_id, name);
749 goto out;
750 }
751
752 static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
753 struct super_block *newsb)
754 {
755 const struct superblock_security_struct *oldsbsec = oldsb->s_security;
756 struct superblock_security_struct *newsbsec = newsb->s_security;
757
758 int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
759 int set_context = (oldsbsec->flags & CONTEXT_MNT);
760 int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
761
762 /*
763 * if the parent was able to be mounted it clearly had no special lsm
764 * mount options. thus we can safely deal with this superblock later
765 */
766 if (!ss_initialized)
767 return;
768
769 /* how can we clone if the old one wasn't set up?? */
770 BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));
771
772 /* if fs is reusing a sb, just let its options stand... */
773 if (newsbsec->flags & SE_SBINITIALIZED)
774 return;
775
776 mutex_lock(&newsbsec->lock);
777
778 newsbsec->flags = oldsbsec->flags;
779
780 newsbsec->sid = oldsbsec->sid;
781 newsbsec->def_sid = oldsbsec->def_sid;
782 newsbsec->behavior = oldsbsec->behavior;
783
784 if (set_context) {
785 u32 sid = oldsbsec->mntpoint_sid;
786
787 if (!set_fscontext)
788 newsbsec->sid = sid;
789 if (!set_rootcontext) {
790 struct inode *newinode = newsb->s_root->d_inode;
791 struct inode_security_struct *newisec = newinode->i_security;
792 newisec->sid = sid;
793 }
794 newsbsec->mntpoint_sid = sid;
795 }
796 if (set_rootcontext) {
797 const struct inode *oldinode = oldsb->s_root->d_inode;
798 const struct inode_security_struct *oldisec = oldinode->i_security;
799 struct inode *newinode = newsb->s_root->d_inode;
800 struct inode_security_struct *newisec = newinode->i_security;
801
802 newisec->sid = oldisec->sid;
803 }
804
805 sb_finish_set_opts(newsb);
806 mutex_unlock(&newsbsec->lock);
807 }
808
809 static int selinux_parse_opts_str(char *options,
810 struct security_mnt_opts *opts)
811 {
812 char *p;
813 char *context = NULL, *defcontext = NULL;
814 char *fscontext = NULL, *rootcontext = NULL;
815 int rc, num_mnt_opts = 0;
816
817 opts->num_mnt_opts = 0;
818
819 /* Standard string-based options. */
820 while ((p = strsep(&options, "|")) != NULL) {
821 int token;
822 substring_t args[MAX_OPT_ARGS];
823
824 if (!*p)
825 continue;
826
827 token = match_token(p, tokens, args);
828
829 switch (token) {
830 case Opt_context:
831 if (context || defcontext) {
832 rc = -EINVAL;
833 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
834 goto out_err;
835 }
836 context = match_strdup(&args[0]);
837 if (!context) {
838 rc = -ENOMEM;
839 goto out_err;
840 }
841 break;
842
843 case Opt_fscontext:
844 if (fscontext) {
845 rc = -EINVAL;
846 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
847 goto out_err;
848 }
849 fscontext = match_strdup(&args[0]);
850 if (!fscontext) {
851 rc = -ENOMEM;
852 goto out_err;
853 }
854 break;
855
856 case Opt_rootcontext:
857 if (rootcontext) {
858 rc = -EINVAL;
859 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
860 goto out_err;
861 }
862 rootcontext = match_strdup(&args[0]);
863 if (!rootcontext) {
864 rc = -ENOMEM;
865 goto out_err;
866 }
867 break;
868
869 case Opt_defcontext:
870 if (context || defcontext) {
871 rc = -EINVAL;
872 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
873 goto out_err;
874 }
875 defcontext = match_strdup(&args[0]);
876 if (!defcontext) {
877 rc = -ENOMEM;
878 goto out_err;
879 }
880 break;
881 case Opt_labelsupport:
882 break;
883 default:
884 rc = -EINVAL;
885 printk(KERN_WARNING "SELinux: unknown mount option\n");
886 goto out_err;
887
888 }
889 }
890
891 rc = -ENOMEM;
892 opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
893 if (!opts->mnt_opts)
894 goto out_err;
895
896 opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC);
897 if (!opts->mnt_opts_flags) {
898 kfree(opts->mnt_opts);
899 goto out_err;
900 }
901
902 if (fscontext) {
903 opts->mnt_opts[num_mnt_opts] = fscontext;
904 opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
905 }
906 if (context) {
907 opts->mnt_opts[num_mnt_opts] = context;
908 opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
909 }
910 if (rootcontext) {
911 opts->mnt_opts[num_mnt_opts] = rootcontext;
912 opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
913 }
914 if (defcontext) {
915 opts->mnt_opts[num_mnt_opts] = defcontext;
916 opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
917 }
918
919 opts->num_mnt_opts = num_mnt_opts;
920 return 0;
921
922 out_err:
923 kfree(context);
924 kfree(defcontext);
925 kfree(fscontext);
926 kfree(rootcontext);
927 return rc;
928 }
929 /*
930 * string mount options parsing and call set the sbsec
931 */
932 static int superblock_doinit(struct super_block *sb, void *data)
933 {
934 int rc = 0;
935 char *options = data;
936 struct security_mnt_opts opts;
937
938 security_init_mnt_opts(&opts);
939
940 if (!data)
941 goto out;
942
943 BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
944
945 rc = selinux_parse_opts_str(options, &opts);
946 if (rc)
947 goto out_err;
948
949 out:
950 rc = selinux_set_mnt_opts(sb, &opts);
951
952 out_err:
953 security_free_mnt_opts(&opts);
954 return rc;
955 }
956
957 static void selinux_write_opts(struct seq_file *m,
958 struct security_mnt_opts *opts)
959 {
960 int i;
961 char *prefix;
962
963 for (i = 0; i < opts->num_mnt_opts; i++) {
964 char *has_comma;
965
966 if (opts->mnt_opts[i])
967 has_comma = strchr(opts->mnt_opts[i], ',');
968 else
969 has_comma = NULL;
970
971 switch (opts->mnt_opts_flags[i]) {
972 case CONTEXT_MNT:
973 prefix = CONTEXT_STR;
974 break;
975 case FSCONTEXT_MNT:
976 prefix = FSCONTEXT_STR;
977 break;
978 case ROOTCONTEXT_MNT:
979 prefix = ROOTCONTEXT_STR;
980 break;
981 case DEFCONTEXT_MNT:
982 prefix = DEFCONTEXT_STR;
983 break;
984 case SE_SBLABELSUPP:
985 seq_putc(m, ',');
986 seq_puts(m, LABELSUPP_STR);
987 continue;
988 default:
989 BUG();
990 };
991 /* we need a comma before each option */
992 seq_putc(m, ',');
993 seq_puts(m, prefix);
994 if (has_comma)
995 seq_putc(m, '\"');
996 seq_puts(m, opts->mnt_opts[i]);
997 if (has_comma)
998 seq_putc(m, '\"');
999 }
1000 }
1001
1002 static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
1003 {
1004 struct security_mnt_opts opts;
1005 int rc;
1006
1007 rc = selinux_get_mnt_opts(sb, &opts);
1008 if (rc) {
1009 /* before policy load we may get EINVAL, don't show anything */
1010 if (rc == -EINVAL)
1011 rc = 0;
1012 return rc;
1013 }
1014
1015 selinux_write_opts(m, &opts);
1016
1017 security_free_mnt_opts(&opts);
1018
1019 return rc;
1020 }
1021
1022 static inline u16 inode_mode_to_security_class(umode_t mode)
1023 {
1024 switch (mode & S_IFMT) {
1025 case S_IFSOCK:
1026 return SECCLASS_SOCK_FILE;
1027 case S_IFLNK:
1028 return SECCLASS_LNK_FILE;
1029 case S_IFREG:
1030 return SECCLASS_FILE;
1031 case S_IFBLK:
1032 return SECCLASS_BLK_FILE;
1033 case S_IFDIR:
1034 return SECCLASS_DIR;
1035 case S_IFCHR:
1036 return SECCLASS_CHR_FILE;
1037 case S_IFIFO:
1038 return SECCLASS_FIFO_FILE;
1039
1040 }
1041
1042 return SECCLASS_FILE;
1043 }
1044
1045 static inline int default_protocol_stream(int protocol)
1046 {
1047 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
1048 }
1049
1050 static inline int default_protocol_dgram(int protocol)
1051 {
1052 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
1053 }
1054
1055 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
1056 {
1057 switch (family) {
1058 case PF_UNIX:
1059 switch (type) {
1060 case SOCK_STREAM:
1061 case SOCK_SEQPACKET:
1062 return SECCLASS_UNIX_STREAM_SOCKET;
1063 case SOCK_DGRAM:
1064 return SECCLASS_UNIX_DGRAM_SOCKET;
1065 }
1066 break;
1067 case PF_INET:
1068 case PF_INET6:
1069 switch (type) {
1070 case SOCK_STREAM:
1071 if (default_protocol_stream(protocol))
1072 return SECCLASS_TCP_SOCKET;
1073 else
1074 return SECCLASS_RAWIP_SOCKET;
1075 case SOCK_DGRAM:
1076 if (default_protocol_dgram(protocol))
1077 return SECCLASS_UDP_SOCKET;
1078 else
1079 return SECCLASS_RAWIP_SOCKET;
1080 case SOCK_DCCP:
1081 return SECCLASS_DCCP_SOCKET;
1082 default:
1083 return SECCLASS_RAWIP_SOCKET;
1084 }
1085 break;
1086 case PF_NETLINK:
1087 switch (protocol) {
1088 case NETLINK_ROUTE:
1089 return SECCLASS_NETLINK_ROUTE_SOCKET;
1090 case NETLINK_FIREWALL:
1091 return SECCLASS_NETLINK_FIREWALL_SOCKET;
1092 case NETLINK_INET_DIAG:
1093 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
1094 case NETLINK_NFLOG:
1095 return SECCLASS_NETLINK_NFLOG_SOCKET;
1096 case NETLINK_XFRM:
1097 return SECCLASS_NETLINK_XFRM_SOCKET;
1098 case NETLINK_SELINUX:
1099 return SECCLASS_NETLINK_SELINUX_SOCKET;
1100 case NETLINK_AUDIT:
1101 return SECCLASS_NETLINK_AUDIT_SOCKET;
1102 case NETLINK_IP6_FW:
1103 return SECCLASS_NETLINK_IP6FW_SOCKET;
1104 case NETLINK_DNRTMSG:
1105 return SECCLASS_NETLINK_DNRT_SOCKET;
1106 case NETLINK_KOBJECT_UEVENT:
1107 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
1108 default:
1109 return SECCLASS_NETLINK_SOCKET;
1110 }
1111 case PF_PACKET:
1112 return SECCLASS_PACKET_SOCKET;
1113 case PF_KEY:
1114 return SECCLASS_KEY_SOCKET;
1115 case PF_APPLETALK:
1116 return SECCLASS_APPLETALK_SOCKET;
1117 }
1118
1119 return SECCLASS_SOCKET;
1120 }
1121
1122 #ifdef CONFIG_PROC_FS
1123 static int selinux_proc_get_sid(struct proc_dir_entry *de,
1124 u16 tclass,
1125 u32 *sid)
1126 {
1127 int buflen, rc;
1128 char *buffer, *path, *end;
1129
1130 buffer = (char *)__get_free_page(GFP_KERNEL);
1131 if (!buffer)
1132 return -ENOMEM;
1133
1134 buflen = PAGE_SIZE;
1135 end = buffer+buflen;
1136 *--end = '\0';
1137 buflen--;
1138 path = end-1;
1139 *path = '/';
1140 while (de && de != de->parent) {
1141 buflen -= de->namelen + 1;
1142 if (buflen < 0)
1143 break;
1144 end -= de->namelen;
1145 memcpy(end, de->name, de->namelen);
1146 *--end = '/';
1147 path = end;
1148 de = de->parent;
1149 }
1150 rc = security_genfs_sid("proc", path, tclass, sid);
1151 free_page((unsigned long)buffer);
1152 return rc;
1153 }
1154 #else
1155 static int selinux_proc_get_sid(struct proc_dir_entry *de,
1156 u16 tclass,
1157 u32 *sid)
1158 {
1159 return -EINVAL;
1160 }
1161 #endif
1162
1163 /* The inode's security attributes must be initialized before first use. */
1164 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
1165 {
1166 struct superblock_security_struct *sbsec = NULL;
1167 struct inode_security_struct *isec = inode->i_security;
1168 u32 sid;
1169 struct dentry *dentry;
1170 #define INITCONTEXTLEN 255
1171 char *context = NULL;
1172 unsigned len = 0;
1173 int rc = 0;
1174
1175 if (isec->initialized)
1176 goto out;
1177
1178 mutex_lock(&isec->lock);
1179 if (isec->initialized)
1180 goto out_unlock;
1181
1182 sbsec = inode->i_sb->s_security;
1183 if (!(sbsec->flags & SE_SBINITIALIZED)) {
1184 /* Defer initialization until selinux_complete_init,
1185 after the initial policy is loaded and the security
1186 server is ready to handle calls. */
1187 spin_lock(&sbsec->isec_lock);
1188 if (list_empty(&isec->list))
1189 list_add(&isec->list, &sbsec->isec_head);
1190 spin_unlock(&sbsec->isec_lock);
1191 goto out_unlock;
1192 }
1193
1194 switch (sbsec->behavior) {
1195 case SECURITY_FS_USE_XATTR:
1196 if (!inode->i_op->getxattr) {
1197 isec->sid = sbsec->def_sid;
1198 break;
1199 }
1200
1201 /* Need a dentry, since the xattr API requires one.
1202 Life would be simpler if we could just pass the inode. */
1203 if (opt_dentry) {
1204 /* Called from d_instantiate or d_splice_alias. */
1205 dentry = dget(opt_dentry);
1206 } else {
1207 /* Called from selinux_complete_init, try to find a dentry. */
1208 dentry = d_find_alias(inode);
1209 }
1210 if (!dentry) {
1211 /*
1212 * this is can be hit on boot when a file is accessed
1213 * before the policy is loaded. When we load policy we
1214 * may find inodes that have no dentry on the
1215 * sbsec->isec_head list. No reason to complain as these
1216 * will get fixed up the next time we go through
1217 * inode_doinit with a dentry, before these inodes could
1218 * be used again by userspace.
1219 */
1220 goto out_unlock;
1221 }
1222
1223 len = INITCONTEXTLEN;
1224 context = kmalloc(len+1, GFP_NOFS);
1225 if (!context) {
1226 rc = -ENOMEM;
1227 dput(dentry);
1228 goto out_unlock;
1229 }
1230 context[len] = '\0';
1231 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1232 context, len);
1233 if (rc == -ERANGE) {
1234 kfree(context);
1235
1236 /* Need a larger buffer. Query for the right size. */
1237 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1238 NULL, 0);
1239 if (rc < 0) {
1240 dput(dentry);
1241 goto out_unlock;
1242 }
1243 len = rc;
1244 context = kmalloc(len+1, GFP_NOFS);
1245 if (!context) {
1246 rc = -ENOMEM;
1247 dput(dentry);
1248 goto out_unlock;
1249 }
1250 context[len] = '\0';
1251 rc = inode->i_op->getxattr(dentry,
1252 XATTR_NAME_SELINUX,
1253 context, len);
1254 }
1255 dput(dentry);
1256 if (rc < 0) {
1257 if (rc != -ENODATA) {
1258 printk(KERN_WARNING "SELinux: %s: getxattr returned "
1259 "%d for dev=%s ino=%ld\n", __func__,
1260 -rc, inode->i_sb->s_id, inode->i_ino);
1261 kfree(context);
1262 goto out_unlock;
1263 }
1264 /* Map ENODATA to the default file SID */
1265 sid = sbsec->def_sid;
1266 rc = 0;
1267 } else {
1268 rc = security_context_to_sid_default(context, rc, &sid,
1269 sbsec->def_sid,
1270 GFP_NOFS);
1271 if (rc) {
1272 char *dev = inode->i_sb->s_id;
1273 unsigned long ino = inode->i_ino;
1274
1275 if (rc == -EINVAL) {
1276 if (printk_ratelimit())
1277 printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid "
1278 "context=%s. This indicates you may need to relabel the inode or the "
1279 "filesystem in question.\n", ino, dev, context);
1280 } else {
1281 printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) "
1282 "returned %d for dev=%s ino=%ld\n",
1283 __func__, context, -rc, dev, ino);
1284 }
1285 kfree(context);
1286 /* Leave with the unlabeled SID */
1287 rc = 0;
1288 break;
1289 }
1290 }
1291 kfree(context);
1292 isec->sid = sid;
1293 break;
1294 case SECURITY_FS_USE_TASK:
1295 isec->sid = isec->task_sid;
1296 break;
1297 case SECURITY_FS_USE_TRANS:
1298 /* Default to the fs SID. */
1299 isec->sid = sbsec->sid;
1300
1301 /* Try to obtain a transition SID. */
1302 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1303 rc = security_transition_sid(isec->task_sid,
1304 sbsec->sid,
1305 isec->sclass,
1306 &sid);
1307 if (rc)
1308 goto out_unlock;
1309 isec->sid = sid;
1310 break;
1311 case SECURITY_FS_USE_MNTPOINT:
1312 isec->sid = sbsec->mntpoint_sid;
1313 break;
1314 default:
1315 /* Default to the fs superblock SID. */
1316 isec->sid = sbsec->sid;
1317
1318 if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) {
1319 struct proc_inode *proci = PROC_I(inode);
1320 if (proci->pde) {
1321 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1322 rc = selinux_proc_get_sid(proci->pde,
1323 isec->sclass,
1324 &sid);
1325 if (rc)
1326 goto out_unlock;
1327 isec->sid = sid;
1328 }
1329 }
1330 break;
1331 }
1332
1333 isec->initialized = 1;
1334
1335 out_unlock:
1336 mutex_unlock(&isec->lock);
1337 out:
1338 if (isec->sclass == SECCLASS_FILE)
1339 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1340 return rc;
1341 }
1342
1343 /* Convert a Linux signal to an access vector. */
1344 static inline u32 signal_to_av(int sig)
1345 {
1346 u32 perm = 0;
1347
1348 switch (sig) {
1349 case SIGCHLD:
1350 /* Commonly granted from child to parent. */
1351 perm = PROCESS__SIGCHLD;
1352 break;
1353 case SIGKILL:
1354 /* Cannot be caught or ignored */
1355 perm = PROCESS__SIGKILL;
1356 break;
1357 case SIGSTOP:
1358 /* Cannot be caught or ignored */
1359 perm = PROCESS__SIGSTOP;
1360 break;
1361 default:
1362 /* All other signals. */
1363 perm = PROCESS__SIGNAL;
1364 break;
1365 }
1366
1367 return perm;
1368 }
1369
1370 /*
1371 * Check permission between a pair of credentials
1372 * fork check, ptrace check, etc.
1373 */
1374 static int cred_has_perm(const struct cred *actor,
1375 const struct cred *target,
1376 u32 perms)
1377 {
1378 u32 asid = cred_sid(actor), tsid = cred_sid(target);
1379
1380 return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL);
1381 }
1382
1383 /*
1384 * Check permission between a pair of tasks, e.g. signal checks,
1385 * fork check, ptrace check, etc.
1386 * tsk1 is the actor and tsk2 is the target
1387 * - this uses the default subjective creds of tsk1
1388 */
1389 static int task_has_perm(const struct task_struct *tsk1,
1390 const struct task_struct *tsk2,
1391 u32 perms)
1392 {
1393 const struct task_security_struct *__tsec1, *__tsec2;
1394 u32 sid1, sid2;
1395
1396 rcu_read_lock();
1397 __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid;
1398 __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid;
1399 rcu_read_unlock();
1400 return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL);
1401 }
1402
1403 /*
1404 * Check permission between current and another task, e.g. signal checks,
1405 * fork check, ptrace check, etc.
1406 * current is the actor and tsk2 is the target
1407 * - this uses current's subjective creds
1408 */
1409 static int current_has_perm(const struct task_struct *tsk,
1410 u32 perms)
1411 {
1412 u32 sid, tsid;
1413
1414 sid = current_sid();
1415 tsid = task_sid(tsk);
1416 return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL);
1417 }
1418
1419 #if CAP_LAST_CAP > 63
1420 #error Fix SELinux to handle capabilities > 63.
1421 #endif
1422
1423 /* Check whether a task is allowed to use a capability. */
1424 static int task_has_capability(struct task_struct *tsk,
1425 const struct cred *cred,
1426 int cap, int audit)
1427 {
1428 struct common_audit_data ad;
1429 struct av_decision avd;
1430 u16 sclass;
1431 u32 sid = cred_sid(cred);
1432 u32 av = CAP_TO_MASK(cap);
1433 int rc;
1434
1435 COMMON_AUDIT_DATA_INIT(&ad, CAP);
1436 ad.tsk = tsk;
1437 ad.u.cap = cap;
1438
1439 switch (CAP_TO_INDEX(cap)) {
1440 case 0:
1441 sclass = SECCLASS_CAPABILITY;
1442 break;
1443 case 1:
1444 sclass = SECCLASS_CAPABILITY2;
1445 break;
1446 default:
1447 printk(KERN_ERR
1448 "SELinux: out of range capability %d\n", cap);
1449 BUG();
1450 }
1451
1452 rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd);
1453 if (audit == SECURITY_CAP_AUDIT)
1454 avc_audit(sid, sid, sclass, av, &avd, rc, &ad);
1455 return rc;
1456 }
1457
1458 /* Check whether a task is allowed to use a system operation. */
1459 static int task_has_system(struct task_struct *tsk,
1460 u32 perms)
1461 {
1462 u32 sid = task_sid(tsk);
1463
1464 return avc_has_perm(sid, SECINITSID_KERNEL,
1465 SECCLASS_SYSTEM, perms, NULL);
1466 }
1467
1468 /* Check whether a task has a particular permission to an inode.
1469 The 'adp' parameter is optional and allows other audit
1470 data to be passed (e.g. the dentry). */
1471 static int inode_has_perm(const struct cred *cred,
1472 struct inode *inode,
1473 u32 perms,
1474 struct common_audit_data *adp)
1475 {
1476 struct inode_security_struct *isec;
1477 struct common_audit_data ad;
1478 u32 sid;
1479
1480 validate_creds(cred);
1481
1482 if (unlikely(IS_PRIVATE(inode)))
1483 return 0;
1484
1485 sid = cred_sid(cred);
1486 isec = inode->i_security;
1487
1488 if (!adp) {
1489 adp = &ad;
1490 COMMON_AUDIT_DATA_INIT(&ad, FS);
1491 ad.u.fs.inode = inode;
1492 }
1493
1494 return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp);
1495 }
1496
1497 /* Same as inode_has_perm, but pass explicit audit data containing
1498 the dentry to help the auditing code to more easily generate the
1499 pathname if needed. */
1500 static inline int dentry_has_perm(const struct cred *cred,
1501 struct vfsmount *mnt,
1502 struct dentry *dentry,
1503 u32 av)
1504 {
1505 struct inode *inode = dentry->d_inode;
1506 struct common_audit_data ad;
1507
1508 COMMON_AUDIT_DATA_INIT(&ad, FS);
1509 ad.u.fs.path.mnt = mnt;
1510 ad.u.fs.path.dentry = dentry;
1511 return inode_has_perm(cred, inode, av, &ad);
1512 }
1513
1514 /* Check whether a task can use an open file descriptor to
1515 access an inode in a given way. Check access to the
1516 descriptor itself, and then use dentry_has_perm to
1517 check a particular permission to the file.
1518 Access to the descriptor is implicitly granted if it
1519 has the same SID as the process. If av is zero, then
1520 access to the file is not checked, e.g. for cases
1521 where only the descriptor is affected like seek. */
1522 static int file_has_perm(const struct cred *cred,
1523 struct file *file,
1524 u32 av)
1525 {
1526 struct file_security_struct *fsec = file->f_security;
1527 struct inode *inode = file->f_path.dentry->d_inode;
1528 struct common_audit_data ad;
1529 u32 sid = cred_sid(cred);
1530 int rc;
1531
1532 COMMON_AUDIT_DATA_INIT(&ad, FS);
1533 ad.u.fs.path = file->f_path;
1534
1535 if (sid != fsec->sid) {
1536 rc = avc_has_perm(sid, fsec->sid,
1537 SECCLASS_FD,
1538 FD__USE,
1539 &ad);
1540 if (rc)
1541 goto out;
1542 }
1543
1544 /* av is zero if only checking access to the descriptor. */
1545 rc = 0;
1546 if (av)
1547 rc = inode_has_perm(cred, inode, av, &ad);
1548
1549 out:
1550 return rc;
1551 }
1552
1553 /* Check whether a task can create a file. */
1554 static int may_create(struct inode *dir,
1555 struct dentry *dentry,
1556 u16 tclass)
1557 {
1558 const struct task_security_struct *tsec = current_security();
1559 struct inode_security_struct *dsec;
1560 struct superblock_security_struct *sbsec;
1561 u32 sid, newsid;
1562 struct common_audit_data ad;
1563 int rc;
1564
1565 dsec = dir->i_security;
1566 sbsec = dir->i_sb->s_security;
1567
1568 sid = tsec->sid;
1569 newsid = tsec->create_sid;
1570
1571 COMMON_AUDIT_DATA_INIT(&ad, FS);
1572 ad.u.fs.path.dentry = dentry;
1573
1574 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
1575 DIR__ADD_NAME | DIR__SEARCH,
1576 &ad);
1577 if (rc)
1578 return rc;
1579
1580 if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
1581 rc = security_transition_sid(sid, dsec->sid, tclass, &newsid);
1582 if (rc)
1583 return rc;
1584 }
1585
1586 rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
1587 if (rc)
1588 return rc;
1589
1590 return avc_has_perm(newsid, sbsec->sid,
1591 SECCLASS_FILESYSTEM,
1592 FILESYSTEM__ASSOCIATE, &ad);
1593 }
1594
1595 /* Check whether a task can create a key. */
1596 static int may_create_key(u32 ksid,
1597 struct task_struct *ctx)
1598 {
1599 u32 sid = task_sid(ctx);
1600
1601 return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
1602 }
1603
1604 #define MAY_LINK 0
1605 #define MAY_UNLINK 1
1606 #define MAY_RMDIR 2
1607
1608 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1609 static int may_link(struct inode *dir,
1610 struct dentry *dentry,
1611 int kind)
1612
1613 {
1614 struct inode_security_struct *dsec, *isec;
1615 struct common_audit_data ad;
1616 u32 sid = current_sid();
1617 u32 av;
1618 int rc;
1619
1620 dsec = dir->i_security;
1621 isec = dentry->d_inode->i_security;
1622
1623 COMMON_AUDIT_DATA_INIT(&ad, FS);
1624 ad.u.fs.path.dentry = dentry;
1625
1626 av = DIR__SEARCH;
1627 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1628 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad);
1629 if (rc)
1630 return rc;
1631
1632 switch (kind) {
1633 case MAY_LINK:
1634 av = FILE__LINK;
1635 break;
1636 case MAY_UNLINK:
1637 av = FILE__UNLINK;
1638 break;
1639 case MAY_RMDIR:
1640 av = DIR__RMDIR;
1641 break;
1642 default:
1643 printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n",
1644 __func__, kind);
1645 return 0;
1646 }
1647
1648 rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad);
1649 return rc;
1650 }
1651
1652 static inline int may_rename(struct inode *old_dir,
1653 struct dentry *old_dentry,
1654 struct inode *new_dir,
1655 struct dentry *new_dentry)
1656 {
1657 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1658 struct common_audit_data ad;
1659 u32 sid = current_sid();
1660 u32 av;
1661 int old_is_dir, new_is_dir;
1662 int rc;
1663
1664 old_dsec = old_dir->i_security;
1665 old_isec = old_dentry->d_inode->i_security;
1666 old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1667 new_dsec = new_dir->i_security;
1668
1669 COMMON_AUDIT_DATA_INIT(&ad, FS);
1670
1671 ad.u.fs.path.dentry = old_dentry;
1672 rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
1673 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1674 if (rc)
1675 return rc;
1676 rc = avc_has_perm(sid, old_isec->sid,
1677 old_isec->sclass, FILE__RENAME, &ad);
1678 if (rc)
1679 return rc;
1680 if (old_is_dir && new_dir != old_dir) {
1681 rc = avc_has_perm(sid, old_isec->sid,
1682 old_isec->sclass, DIR__REPARENT, &ad);
1683 if (rc)
1684 return rc;
1685 }
1686
1687 ad.u.fs.path.dentry = new_dentry;
1688 av = DIR__ADD_NAME | DIR__SEARCH;
1689 if (new_dentry->d_inode)
1690 av |= DIR__REMOVE_NAME;
1691 rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1692 if (rc)
1693 return rc;
1694 if (new_dentry->d_inode) {
1695 new_isec = new_dentry->d_inode->i_security;
1696 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1697 rc = avc_has_perm(sid, new_isec->sid,
1698 new_isec->sclass,
1699 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1700 if (rc)
1701 return rc;
1702 }
1703
1704 return 0;
1705 }
1706
1707 /* Check whether a task can perform a filesystem operation. */
1708 static int superblock_has_perm(const struct cred *cred,
1709 struct super_block *sb,
1710 u32 perms,
1711 struct common_audit_data *ad)
1712 {
1713 struct superblock_security_struct *sbsec;
1714 u32 sid = cred_sid(cred);
1715
1716 sbsec = sb->s_security;
1717 return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
1718 }
1719
1720 /* Convert a Linux mode and permission mask to an access vector. */
1721 static inline u32 file_mask_to_av(int mode, int mask)
1722 {
1723 u32 av = 0;
1724
1725 if ((mode & S_IFMT) != S_IFDIR) {
1726 if (mask & MAY_EXEC)
1727 av |= FILE__EXECUTE;
1728 if (mask & MAY_READ)
1729 av |= FILE__READ;
1730
1731 if (mask & MAY_APPEND)
1732 av |= FILE__APPEND;
1733 else if (mask & MAY_WRITE)
1734 av |= FILE__WRITE;
1735
1736 } else {
1737 if (mask & MAY_EXEC)
1738 av |= DIR__SEARCH;
1739 if (mask & MAY_WRITE)
1740 av |= DIR__WRITE;
1741 if (mask & MAY_READ)
1742 av |= DIR__READ;
1743 }
1744
1745 return av;
1746 }
1747
1748 /* Convert a Linux file to an access vector. */
1749 static inline u32 file_to_av(struct file *file)
1750 {
1751 u32 av = 0;
1752
1753 if (file->f_mode & FMODE_READ)
1754 av |= FILE__READ;
1755 if (file->f_mode & FMODE_WRITE) {
1756 if (file->f_flags & O_APPEND)
1757 av |= FILE__APPEND;
1758 else
1759 av |= FILE__WRITE;
1760 }
1761 if (!av) {
1762 /*
1763 * Special file opened with flags 3 for ioctl-only use.
1764 */
1765 av = FILE__IOCTL;
1766 }
1767
1768 return av;
1769 }
1770
1771 /*
1772 * Convert a file to an access vector and include the correct open
1773 * open permission.
1774 */
1775 static inline u32 open_file_to_av(struct file *file)
1776 {
1777 u32 av = file_to_av(file);
1778
1779 if (selinux_policycap_openperm)
1780 av |= FILE__OPEN;
1781
1782 return av;
1783 }
1784
1785 /* Hook functions begin here. */
1786
1787 static int selinux_ptrace_access_check(struct task_struct *child,
1788 unsigned int mode)
1789 {
1790 int rc;
1791
1792 rc = cap_ptrace_access_check(child, mode);
1793 if (rc)
1794 return rc;
1795
1796 if (mode == PTRACE_MODE_READ) {
1797 u32 sid = current_sid();
1798 u32 csid = task_sid(child);
1799 return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);
1800 }
1801
1802 return current_has_perm(child, PROCESS__PTRACE);
1803 }
1804
1805 static int selinux_ptrace_traceme(struct task_struct *parent)
1806 {
1807 int rc;
1808
1809 rc = cap_ptrace_traceme(parent);
1810 if (rc)
1811 return rc;
1812
1813 return task_has_perm(parent, current, PROCESS__PTRACE);
1814 }
1815
1816 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1817 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1818 {
1819 int error;
1820
1821 error = current_has_perm(target, PROCESS__GETCAP);
1822 if (error)
1823 return error;
1824
1825 return cap_capget(target, effective, inheritable, permitted);
1826 }
1827
1828 static int selinux_capset(struct cred *new, const struct cred *old,
1829 const kernel_cap_t *effective,
1830 const kernel_cap_t *inheritable,
1831 const kernel_cap_t *permitted)
1832 {
1833 int error;
1834
1835 error = cap_capset(new, old,
1836 effective, inheritable, permitted);
1837 if (error)
1838 return error;
1839
1840 return cred_has_perm(old, new, PROCESS__SETCAP);
1841 }
1842
1843 /*
1844 * (This comment used to live with the selinux_task_setuid hook,
1845 * which was removed).
1846 *
1847 * Since setuid only affects the current process, and since the SELinux
1848 * controls are not based on the Linux identity attributes, SELinux does not
1849 * need to control this operation. However, SELinux does control the use of
1850 * the CAP_SETUID and CAP_SETGID capabilities using the capable hook.
1851 */
1852
1853 static int selinux_capable(struct task_struct *tsk, const struct cred *cred,
1854 int cap, int audit)
1855 {
1856 int rc;
1857
1858 rc = cap_capable(tsk, cred, cap, audit);
1859 if (rc)
1860 return rc;
1861
1862 return task_has_capability(tsk, cred, cap, audit);
1863 }
1864
1865 static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
1866 {
1867 int buflen, rc;
1868 char *buffer, *path, *end;
1869
1870 rc = -ENOMEM;
1871 buffer = (char *)__get_free_page(GFP_KERNEL);
1872 if (!buffer)
1873 goto out;
1874
1875 buflen = PAGE_SIZE;
1876 end = buffer+buflen;
1877 *--end = '\0';
1878 buflen--;
1879 path = end-1;
1880 *path = '/';
1881 while (table) {
1882 const char *name = table->procname;
1883 size_t namelen = strlen(name);
1884 buflen -= namelen + 1;
1885 if (buflen < 0)
1886 goto out_free;
1887 end -= namelen;
1888 memcpy(end, name, namelen);
1889 *--end = '/';
1890 path = end;
1891 table = table->parent;
1892 }
1893 buflen -= 4;
1894 if (buflen < 0)
1895 goto out_free;
1896 end -= 4;
1897 memcpy(end, "/sys", 4);
1898 path = end;
1899 rc = security_genfs_sid("proc", path, tclass, sid);
1900 out_free:
1901 free_page((unsigned long)buffer);
1902 out:
1903 return rc;
1904 }
1905
1906 static int selinux_sysctl(ctl_table *table, int op)
1907 {
1908 int error = 0;
1909 u32 av;
1910 u32 tsid, sid;
1911 int rc;
1912
1913 sid = current_sid();
1914
1915 rc = selinux_sysctl_get_sid(table, (op == 0001) ?
1916 SECCLASS_DIR : SECCLASS_FILE, &tsid);
1917 if (rc) {
1918 /* Default to the well-defined sysctl SID. */
1919 tsid = SECINITSID_SYSCTL;
1920 }
1921
1922 /* The op values are "defined" in sysctl.c, thereby creating
1923 * a bad coupling between this module and sysctl.c */
1924 if (op == 001) {
1925 error = avc_has_perm(sid, tsid,
1926 SECCLASS_DIR, DIR__SEARCH, NULL);
1927 } else {
1928 av = 0;
1929 if (op & 004)
1930 av |= FILE__READ;
1931 if (op & 002)
1932 av |= FILE__WRITE;
1933 if (av)
1934 error = avc_has_perm(sid, tsid,
1935 SECCLASS_FILE, av, NULL);
1936 }
1937
1938 return error;
1939 }
1940
1941 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1942 {
1943 const struct cred *cred = current_cred();
1944 int rc = 0;
1945
1946 if (!sb)
1947 return 0;
1948
1949 switch (cmds) {
1950 case Q_SYNC:
1951 case Q_QUOTAON:
1952 case Q_QUOTAOFF:
1953 case Q_SETINFO:
1954 case Q_SETQUOTA:
1955 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
1956 break;
1957 case Q_GETFMT:
1958 case Q_GETINFO:
1959 case Q_GETQUOTA:
1960 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
1961 break;
1962 default:
1963 rc = 0; /* let the kernel handle invalid cmds */
1964 break;
1965 }
1966 return rc;
1967 }
1968
1969 static int selinux_quota_on(struct dentry *dentry)
1970 {
1971 const struct cred *cred = current_cred();
1972
1973 return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON);
1974 }
1975
1976 static int selinux_syslog(int type, bool from_file)
1977 {
1978 int rc;
1979
1980 rc = cap_syslog(type, from_file);
1981 if (rc)
1982 return rc;
1983
1984 switch (type) {
1985 case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */
1986 case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */
1987 rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1988 break;
1989 case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */
1990 case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */
1991 /* Set level of messages printed to console */
1992 case SYSLOG_ACTION_CONSOLE_LEVEL:
1993 rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1994 break;
1995 case SYSLOG_ACTION_CLOSE: /* Close log */
1996 case SYSLOG_ACTION_OPEN: /* Open log */
1997 case SYSLOG_ACTION_READ: /* Read from log */
1998 case SYSLOG_ACTION_READ_CLEAR: /* Read/clear last kernel messages */
1999 case SYSLOG_ACTION_CLEAR: /* Clear ring buffer */
2000 default:
2001 rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
2002 break;
2003 }
2004 return rc;
2005 }
2006
2007 /*
2008 * Check that a process has enough memory to allocate a new virtual
2009 * mapping. 0 means there is enough memory for the allocation to
2010 * succeed and -ENOMEM implies there is not.
2011 *
2012 * Do not audit the selinux permission check, as this is applied to all
2013 * processes that allocate mappings.
2014 */
2015 static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
2016 {
2017 int rc, cap_sys_admin = 0;
2018
2019 rc = selinux_capable(current, current_cred(), CAP_SYS_ADMIN,
2020 SECURITY_CAP_NOAUDIT);
2021 if (rc == 0)
2022 cap_sys_admin = 1;
2023
2024 return __vm_enough_memory(mm, pages, cap_sys_admin);
2025 }
2026
2027 /* binprm security operations */
2028
2029 static int selinux_bprm_set_creds(struct linux_binprm *bprm)
2030 {
2031 const struct task_security_struct *old_tsec;
2032 struct task_security_struct *new_tsec;
2033 struct inode_security_struct *isec;
2034 struct common_audit_data ad;
2035 struct inode *inode = bprm->file->f_path.dentry->d_inode;
2036 int rc;
2037
2038 rc = cap_bprm_set_creds(bprm);
2039 if (rc)
2040 return rc;
2041
2042 /* SELinux context only depends on initial program or script and not
2043 * the script interpreter */
2044 if (bprm->cred_prepared)
2045 return 0;
2046
2047 old_tsec = current_security();
2048 new_tsec = bprm->cred->security;
2049 isec = inode->i_security;
2050
2051 /* Default to the current task SID. */
2052 new_tsec->sid = old_tsec->sid;
2053 new_tsec->osid = old_tsec->sid;
2054
2055 /* Reset fs, key, and sock SIDs on execve. */
2056 new_tsec->create_sid = 0;
2057 new_tsec->keycreate_sid = 0;
2058 new_tsec->sockcreate_sid = 0;
2059
2060 if (old_tsec->exec_sid) {
2061 new_tsec->sid = old_tsec->exec_sid;
2062 /* Reset exec SID on execve. */
2063 new_tsec->exec_sid = 0;
2064 } else {
2065 /* Check for a default transition on this program. */
2066 rc = security_transition_sid(old_tsec->sid, isec->sid,
2067 SECCLASS_PROCESS, &new_tsec->sid);
2068 if (rc)
2069 return rc;
2070 }
2071
2072 COMMON_AUDIT_DATA_INIT(&ad, FS);
2073 ad.u.fs.path = bprm->file->f_path;
2074
2075 if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
2076 new_tsec->sid = old_tsec->sid;
2077
2078 if (new_tsec->sid == old_tsec->sid) {
2079 rc = avc_has_perm(old_tsec->sid, isec->sid,
2080 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
2081 if (rc)
2082 return rc;
2083 } else {
2084 /* Check permissions for the transition. */
2085 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2086 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
2087 if (rc)
2088 return rc;
2089
2090 rc = avc_has_perm(new_tsec->sid, isec->sid,
2091 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
2092 if (rc)
2093 return rc;
2094
2095 /* Check for shared state */
2096 if (bprm->unsafe & LSM_UNSAFE_SHARE) {
2097 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2098 SECCLASS_PROCESS, PROCESS__SHARE,
2099 NULL);
2100 if (rc)
2101 return -EPERM;
2102 }
2103
2104 /* Make sure that anyone attempting to ptrace over a task that
2105 * changes its SID has the appropriate permit */
2106 if (bprm->unsafe &
2107 (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
2108 struct task_struct *tracer;
2109 struct task_security_struct *sec;
2110 u32 ptsid = 0;
2111
2112 rcu_read_lock();
2113 tracer = tracehook_tracer_task(current);
2114 if (likely(tracer != NULL)) {
2115 sec = __task_cred(tracer)->security;
2116 ptsid = sec->sid;
2117 }
2118 rcu_read_unlock();
2119
2120 if (ptsid != 0) {
2121 rc = avc_has_perm(ptsid, new_tsec->sid,
2122 SECCLASS_PROCESS,
2123 PROCESS__PTRACE, NULL);
2124 if (rc)
2125 return -EPERM;
2126 }
2127 }
2128
2129 /* Clear any possibly unsafe personality bits on exec: */
2130 bprm->per_clear |= PER_CLEAR_ON_SETID;
2131 }
2132
2133 return 0;
2134 }
2135
2136 static int selinux_bprm_secureexec(struct linux_binprm *bprm)
2137 {
2138 const struct task_security_struct *tsec = current_security();
2139 u32 sid, osid;
2140 int atsecure = 0;
2141
2142 sid = tsec->sid;
2143 osid = tsec->osid;
2144
2145 if (osid != sid) {
2146 /* Enable secure mode for SIDs transitions unless
2147 the noatsecure permission is granted between
2148 the two SIDs, i.e. ahp returns 0. */
2149 atsecure = avc_has_perm(osid, sid,
2150 SECCLASS_PROCESS,
2151 PROCESS__NOATSECURE, NULL);
2152 }
2153
2154 return (atsecure || cap_bprm_secureexec(bprm));
2155 }
2156
2157 extern struct vfsmount *selinuxfs_mount;
2158 extern struct dentry *selinux_null;
2159
2160 /* Derived from fs/exec.c:flush_old_files. */
2161 static inline void flush_unauthorized_files(const struct cred *cred,
2162 struct files_struct *files)
2163 {
2164 struct common_audit_data ad;
2165 struct file *file, *devnull = NULL;
2166 struct tty_struct *tty;
2167 struct fdtable *fdt;
2168 long j = -1;
2169 int drop_tty = 0;
2170
2171 tty = get_current_tty();
2172 if (tty) {
2173 spin_lock(&tty_files_lock);
2174 if (!list_empty(&tty->tty_files)) {
2175 struct tty_file_private *file_priv;
2176 struct inode *inode;
2177
2178 /* Revalidate access to controlling tty.
2179 Use inode_has_perm on the tty inode directly rather
2180 than using file_has_perm, as this particular open
2181 file may belong to another process and we are only
2182 interested in the inode-based check here. */
2183 file_priv = list_first_entry(&tty->tty_files,
2184 struct tty_file_private, list);
2185 file = file_priv->file;
2186 inode = file->f_path.dentry->d_inode;
2187 if (inode_has_perm(cred, inode,
2188 FILE__READ | FILE__WRITE, NULL)) {
2189 drop_tty = 1;
2190 }
2191 }
2192 spin_unlock(&tty_files_lock);
2193 tty_kref_put(tty);
2194 }
2195 /* Reset controlling tty. */
2196 if (drop_tty)
2197 no_tty();
2198
2199 /* Revalidate access to inherited open files. */
2200
2201 COMMON_AUDIT_DATA_INIT(&ad, FS);
2202
2203 spin_lock(&files->file_lock);
2204 for (;;) {
2205 unsigned long set, i;
2206 int fd;
2207
2208 j++;
2209 i = j * __NFDBITS;
2210 fdt = files_fdtable(files);
2211 if (i >= fdt->max_fds)
2212 break;
2213 set = fdt->open_fds->fds_bits[j];
2214 if (!set)
2215 continue;
2216 spin_unlock(&files->file_lock);
2217 for ( ; set ; i++, set >>= 1) {
2218 if (set & 1) {
2219 file = fget(i);
2220 if (!file)
2221 continue;
2222 if (file_has_perm(cred,
2223 file,
2224 file_to_av(file))) {
2225 sys_close(i);
2226 fd = get_unused_fd();
2227 if (fd != i) {
2228 if (fd >= 0)
2229 put_unused_fd(fd);
2230 fput(file);
2231 continue;
2232 }
2233 if (devnull) {
2234 get_file(devnull);
2235 } else {
2236 devnull = dentry_open(
2237 dget(selinux_null),
2238 mntget(selinuxfs_mount),
2239 O_RDWR, cred);
2240 if (IS_ERR(devnull)) {
2241 devnull = NULL;
2242 put_unused_fd(fd);
2243 fput(file);
2244 continue;
2245 }
2246 }
2247 fd_install(fd, devnull);
2248 }
2249 fput(file);
2250 }
2251 }
2252 spin_lock(&files->file_lock);
2253
2254 }
2255 spin_unlock(&files->file_lock);
2256 }
2257
2258 /*
2259 * Prepare a process for imminent new credential changes due to exec
2260 */
2261 static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
2262 {
2263 struct task_security_struct *new_tsec;
2264 struct rlimit *rlim, *initrlim;
2265 int rc, i;
2266
2267 new_tsec = bprm->cred->security;
2268 if (new_tsec->sid == new_tsec->osid)
2269 return;
2270
2271 /* Close files for which the new task SID is not authorized. */
2272 flush_unauthorized_files(bprm->cred, current->files);
2273
2274 /* Always clear parent death signal on SID transitions. */
2275 current->pdeath_signal = 0;
2276
2277 /* Check whether the new SID can inherit resource limits from the old
2278 * SID. If not, reset all soft limits to the lower of the current
2279 * task's hard limit and the init task's soft limit.
2280 *
2281 * Note that the setting of hard limits (even to lower them) can be
2282 * controlled by the setrlimit check. The inclusion of the init task's
2283 * soft limit into the computation is to avoid resetting soft limits
2284 * higher than the default soft limit for cases where the default is
2285 * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
2286 */
2287 rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
2288 PROCESS__RLIMITINH, NULL);
2289 if (rc) {
2290 /* protect against do_prlimit() */
2291 task_lock(current);
2292 for (i = 0; i < RLIM_NLIMITS; i++) {
2293 rlim = current->signal->rlim + i;
2294 initrlim = init_task.signal->rlim + i;
2295 rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
2296 }
2297 task_unlock(current);
2298 update_rlimit_cpu(current, rlimit(RLIMIT_CPU));
2299 }
2300 }
2301
2302 /*
2303 * Clean up the process immediately after the installation of new credentials
2304 * due to exec
2305 */
2306 static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
2307 {
2308 const struct task_security_struct *tsec = current_security();
2309 struct itimerval itimer;
2310 u32 osid, sid;
2311 int rc, i;
2312
2313 osid = tsec->osid;
2314 sid = tsec->sid;
2315
2316 if (sid == osid)
2317 return;
2318
2319 /* Check whether the new SID can inherit signal state from the old SID.
2320 * If not, clear itimers to avoid subsequent signal generation and
2321 * flush and unblock signals.
2322 *
2323 * This must occur _after_ the task SID has been updated so that any
2324 * kill done after the flush will be checked against the new SID.
2325 */
2326 rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
2327 if (rc) {
2328 memset(&itimer, 0, sizeof itimer);
2329 for (i = 0; i < 3; i++)
2330 do_setitimer(i, &itimer, NULL);
2331 spin_lock_irq(&current->sighand->siglock);
2332 if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) {
2333 __flush_signals(current);
2334 flush_signal_handlers(current, 1);
2335 sigemptyset(&current->blocked);
2336 }
2337 spin_unlock_irq(&current->sighand->siglock);
2338 }
2339
2340 /* Wake up the parent if it is waiting so that it can recheck
2341 * wait permission to the new task SID. */
2342 read_lock(&tasklist_lock);
2343 __wake_up_parent(current, current->real_parent);
2344 read_unlock(&tasklist_lock);
2345 }
2346
2347 /* superblock security operations */
2348
2349 static int selinux_sb_alloc_security(struct super_block *sb)
2350 {
2351 return superblock_alloc_security(sb);
2352 }
2353
2354 static void selinux_sb_free_security(struct super_block *sb)
2355 {
2356 superblock_free_security(sb);
2357 }
2358
2359 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
2360 {
2361 if (plen > olen)
2362 return 0;
2363
2364 return !memcmp(prefix, option, plen);
2365 }
2366
2367 static inline int selinux_option(char *option, int len)
2368 {
2369 return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) ||
2370 match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) ||
2371 match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) ||
2372 match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) ||
2373 match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len));
2374 }
2375
2376 static inline void take_option(char **to, char *from, int *first, int len)
2377 {
2378 if (!*first) {
2379 **to = ',';
2380 *to += 1;
2381 } else
2382 *first = 0;
2383 memcpy(*to, from, len);
2384 *to += len;
2385 }
2386
2387 static inline void take_selinux_option(char **to, char *from, int *first,
2388 int len)
2389 {
2390 int current_size = 0;
2391
2392 if (!*first) {
2393 **to = '|';
2394 *to += 1;
2395 } else
2396 *first = 0;
2397
2398 while (current_size < len) {
2399 if (*from != '"') {
2400 **to = *from;
2401 *to += 1;
2402 }
2403 from += 1;
2404 current_size += 1;
2405 }
2406 }
2407
2408 static int selinux_sb_copy_data(char *orig, char *copy)
2409 {
2410 int fnosec, fsec, rc = 0;
2411 char *in_save, *in_curr, *in_end;
2412 char *sec_curr, *nosec_save, *nosec;
2413 int open_quote = 0;
2414
2415 in_curr = orig;
2416 sec_curr = copy;
2417
2418 nosec = (char *)get_zeroed_page(GFP_KERNEL);
2419 if (!nosec) {
2420 rc = -ENOMEM;
2421 goto out;
2422 }
2423
2424 nosec_save = nosec;
2425 fnosec = fsec = 1;
2426 in_save = in_end = orig;
2427
2428 do {
2429 if (*in_end == '"')
2430 open_quote = !open_quote;
2431 if ((*in_end == ',' && open_quote == 0) ||
2432 *in_end == '\0') {
2433 int len = in_end - in_curr;
2434
2435 if (selinux_option(in_curr, len))
2436 take_selinux_option(&sec_curr, in_curr, &fsec, len);
2437 else
2438 take_option(&nosec, in_curr, &fnosec, len);
2439
2440 in_curr = in_end + 1;
2441 }
2442 } while (*in_end++);
2443
2444 strcpy(in_save, nosec_save);
2445 free_page((unsigned long)nosec_save);
2446 out:
2447 return rc;
2448 }
2449
2450 static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
2451 {
2452 const struct cred *cred = current_cred();
2453 struct common_audit_data ad;
2454 int rc;
2455
2456 rc = superblock_doinit(sb, data);
2457 if (rc)
2458 return rc;
2459
2460 /* Allow all mounts performed by the kernel */
2461 if (flags & MS_KERNMOUNT)
2462 return 0;
2463
2464 COMMON_AUDIT_DATA_INIT(&ad, FS);
2465 ad.u.fs.path.dentry = sb->s_root;
2466 return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
2467 }
2468
2469 static int selinux_sb_statfs(struct dentry *dentry)
2470 {
2471 const struct cred *cred = current_cred();
2472 struct common_audit_data ad;
2473
2474 COMMON_AUDIT_DATA_INIT(&ad, FS);
2475 ad.u.fs.path.dentry = dentry->d_sb->s_root;
2476 return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
2477 }
2478
2479 static int selinux_mount(char *dev_name,
2480 struct path *path,
2481 char *type,
2482 unsigned long flags,
2483 void *data)
2484 {
2485 const struct cred *cred = current_cred();
2486
2487 if (flags & MS_REMOUNT)
2488 return superblock_has_perm(cred, path->mnt->mnt_sb,
2489 FILESYSTEM__REMOUNT, NULL);
2490 else
2491 return dentry_has_perm(cred, path->mnt, path->dentry,
2492 FILE__MOUNTON);
2493 }
2494
2495 static int selinux_umount(struct vfsmount *mnt, int flags)
2496 {
2497 const struct cred *cred = current_cred();
2498
2499 return superblock_has_perm(cred, mnt->mnt_sb,
2500 FILESYSTEM__UNMOUNT, NULL);
2501 }
2502
2503 /* inode security operations */
2504
2505 static int selinux_inode_alloc_security(struct inode *inode)
2506 {
2507 return inode_alloc_security(inode);
2508 }
2509
2510 static void selinux_inode_free_security(struct inode *inode)
2511 {
2512 inode_free_security(inode);
2513 }
2514
2515 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2516 char **name, void **value,
2517 size_t *len)
2518 {
2519 const struct task_security_struct *tsec = current_security();
2520 struct inode_security_struct *dsec;
2521 struct superblock_security_struct *sbsec;
2522 u32 sid, newsid, clen;
2523 int rc;
2524 char *namep = NULL, *context;
2525
2526 dsec = dir->i_security;
2527 sbsec = dir->i_sb->s_security;
2528
2529 sid = tsec->sid;
2530 newsid = tsec->create_sid;
2531
2532 if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
2533 rc = security_transition_sid(sid, dsec->sid,
2534 inode_mode_to_security_class(inode->i_mode),
2535 &newsid);
2536 if (rc) {
2537 printk(KERN_WARNING "%s: "
2538 "security_transition_sid failed, rc=%d (dev=%s "
2539 "ino=%ld)\n",
2540 __func__,
2541 -rc, inode->i_sb->s_id, inode->i_ino);
2542 return rc;
2543 }
2544 }
2545
2546 /* Possibly defer initialization to selinux_complete_init. */
2547 if (sbsec->flags & SE_SBINITIALIZED) {
2548 struct inode_security_struct *isec = inode->i_security;
2549 isec->sclass = inode_mode_to_security_class(inode->i_mode);
2550 isec->sid = newsid;
2551 isec->initialized = 1;
2552 }
2553
2554 if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP))
2555 return -EOPNOTSUPP;
2556
2557 if (name) {
2558 namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS);
2559 if (!namep)
2560 return -ENOMEM;
2561 *name = namep;
2562 }
2563
2564 if (value && len) {
2565 rc = security_sid_to_context_force(newsid, &context, &clen);
2566 if (rc) {
2567 kfree(namep);
2568 return rc;
2569 }
2570 *value = context;
2571 *len = clen;
2572 }
2573
2574 return 0;
2575 }
2576
2577 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
2578 {
2579 return may_create(dir, dentry, SECCLASS_FILE);
2580 }
2581
2582 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2583 {
2584 return may_link(dir, old_dentry, MAY_LINK);
2585 }
2586
2587 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2588 {
2589 return may_link(dir, dentry, MAY_UNLINK);
2590 }
2591
2592 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2593 {
2594 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2595 }
2596
2597 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2598 {
2599 return may_create(dir, dentry, SECCLASS_DIR);
2600 }
2601
2602 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2603 {
2604 return may_link(dir, dentry, MAY_RMDIR);
2605 }
2606
2607 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2608 {
2609 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2610 }
2611
2612 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2613 struct inode *new_inode, struct dentry *new_dentry)
2614 {
2615 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2616 }
2617
2618 static int selinux_inode_readlink(struct dentry *dentry)
2619 {
2620 const struct cred *cred = current_cred();
2621
2622 return dentry_has_perm(cred, NULL, dentry, FILE__READ);
2623 }
2624
2625 static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2626 {
2627 const struct cred *cred = current_cred();
2628
2629 return dentry_has_perm(cred, NULL, dentry, FILE__READ);
2630 }
2631
2632 static int selinux_inode_permission(struct inode *inode, int mask)
2633 {
2634 const struct cred *cred = current_cred();
2635 struct common_audit_data ad;
2636 u32 perms;
2637 bool from_access;
2638
2639 from_access = mask & MAY_ACCESS;
2640 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
2641
2642 /* No permission to check. Existence test. */
2643 if (!mask)
2644 return 0;
2645
2646 COMMON_AUDIT_DATA_INIT(&ad, FS);
2647 ad.u.fs.inode = inode;
2648
2649 if (from_access)
2650 ad.selinux_audit_data.auditdeny |= FILE__AUDIT_ACCESS;
2651
2652 perms = file_mask_to_av(inode->i_mode, mask);
2653
2654 return inode_has_perm(cred, inode, perms, &ad);
2655 }
2656
2657 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2658 {
2659 const struct cred *cred = current_cred();
2660 unsigned int ia_valid = iattr->ia_valid;
2661
2662 /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */
2663 if (ia_valid & ATTR_FORCE) {
2664 ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE |
2665 ATTR_FORCE);
2666 if (!ia_valid)
2667 return 0;
2668 }
2669
2670 if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2671 ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET))
2672 return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
2673
2674 return dentry_has_perm(cred, NULL, dentry, FILE__WRITE);
2675 }
2676
2677 static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2678 {
2679 const struct cred *cred = current_cred();
2680
2681 return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR);
2682 }
2683
2684 static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
2685 {
2686 const struct cred *cred = current_cred();
2687
2688 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2689 sizeof XATTR_SECURITY_PREFIX - 1)) {
2690 if (!strcmp(name, XATTR_NAME_CAPS)) {
2691 if (!capable(CAP_SETFCAP))
2692 return -EPERM;
2693 } else if (!capable(CAP_SYS_ADMIN)) {
2694 /* A different attribute in the security namespace.
2695 Restrict to administrator. */
2696 return -EPERM;
2697 }
2698 }
2699
2700 /* Not an attribute we recognize, so just check the
2701 ordinary setattr permission. */
2702 return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
2703 }
2704
2705 static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
2706 const void *value, size_t size, int flags)
2707 {
2708 struct inode *inode = dentry->d_inode;
2709 struct inode_security_struct *isec = inode->i_security;
2710 struct superblock_security_struct *sbsec;
2711 struct common_audit_data ad;
2712 u32 newsid, sid = current_sid();
2713 int rc = 0;
2714
2715 if (strcmp(name, XATTR_NAME_SELINUX))
2716 return selinux_inode_setotherxattr(dentry, name);
2717
2718 sbsec = inode->i_sb->s_security;
2719 if (!(sbsec->flags & SE_SBLABELSUPP))
2720 return -EOPNOTSUPP;
2721
2722 if (!is_owner_or_cap(inode))
2723 return -EPERM;
2724
2725 COMMON_AUDIT_DATA_INIT(&ad, FS);
2726 ad.u.fs.path.dentry = dentry;
2727
2728 rc = avc_has_perm(sid, isec->sid, isec->sclass,
2729 FILE__RELABELFROM, &ad);
2730 if (rc)
2731 return rc;
2732
2733 rc = security_context_to_sid(value, size, &newsid);
2734 if (rc == -EINVAL) {
2735 if (!capable(CAP_MAC_ADMIN))
2736 return rc;
2737 rc = security_context_to_sid_force(value, size, &newsid);
2738 }
2739 if (rc)
2740 return rc;
2741
2742 rc = avc_has_perm(sid, newsid, isec->sclass,
2743 FILE__RELABELTO, &ad);
2744 if (rc)
2745 return rc;
2746
2747 rc = security_validate_transition(isec->sid, newsid, sid,
2748 isec->sclass);
2749 if (rc)
2750 return rc;
2751
2752 return avc_has_perm(newsid,
2753 sbsec->sid,
2754 SECCLASS_FILESYSTEM,
2755 FILESYSTEM__ASSOCIATE,
2756 &ad);
2757 }
2758
2759 static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
2760 const void *value, size_t size,
2761 int flags)
2762 {
2763 struct inode *inode = dentry->d_inode;
2764 struct inode_security_struct *isec = inode->i_security;
2765 u32 newsid;
2766 int rc;
2767
2768 if (strcmp(name, XATTR_NAME_SELINUX)) {
2769 /* Not an attribute we recognize, so nothing to do. */
2770 return;
2771 }
2772
2773 rc = security_context_to_sid_force(value, size, &newsid);
2774 if (rc) {
2775 printk(KERN_ERR "SELinux: unable to map context to SID"
2776 "for (%s, %lu), rc=%d\n",
2777 inode->i_sb->s_id, inode->i_ino, -rc);
2778 return;
2779 }
2780
2781 isec->sid = newsid;
2782 return;
2783 }
2784
2785 static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
2786 {
2787 const struct cred *cred = current_cred();
2788
2789 return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
2790 }
2791
2792 static int selinux_inode_listxattr(struct dentry *dentry)
2793 {
2794 const struct cred *cred = current_cred();
2795
2796 return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
2797 }
2798
2799 static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
2800 {
2801 if (strcmp(name, XATTR_NAME_SELINUX))
2802 return selinux_inode_setotherxattr(dentry, name);
2803
2804 /* No one is allowed to remove a SELinux security label.
2805 You can change the label, but all data must be labeled. */
2806 return -EACCES;
2807 }
2808
2809 /*
2810 * Copy the inode security context value to the user.
2811 *
2812 * Permission check is handled by selinux_inode_getxattr hook.
2813 */
2814 static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2815 {
2816 u32 size;
2817 int error;
2818 char *context = NULL;
2819 struct inode_security_struct *isec = inode->i_security;
2820
2821 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2822 return -EOPNOTSUPP;
2823
2824 /*
2825 * If the caller has CAP_MAC_ADMIN, then get the raw context
2826 * value even if it is not defined by current policy; otherwise,
2827 * use the in-core value under current policy.
2828 * Use the non-auditing forms of the permission checks since
2829 * getxattr may be called by unprivileged processes commonly
2830 * and lack of permission just means that we fall back to the
2831 * in-core context value, not a denial.
2832 */
2833 error = selinux_capable(current, current_cred(), CAP_MAC_ADMIN,
2834 SECURITY_CAP_NOAUDIT);
2835 if (!error)
2836 error = security_sid_to_context_force(isec->sid, &context,
2837 &size);
2838 else
2839 error = security_sid_to_context(isec->sid, &context, &size);
2840 if (error)
2841 return error;
2842 error = size;
2843 if (alloc) {
2844 *buffer = context;
2845 goto out_nofree;
2846 }
2847 kfree(context);
2848 out_nofree:
2849 return error;
2850 }
2851
2852 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2853 const void *value, size_t size, int flags)
2854 {
2855 struct inode_security_struct *isec = inode->i_security;
2856 u32 newsid;
2857 int rc;
2858
2859 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2860 return -EOPNOTSUPP;
2861
2862 if (!value || !size)
2863 return -EACCES;
2864
2865 rc = security_context_to_sid((void *)value, size, &newsid);
2866 if (rc)
2867 return rc;
2868
2869 isec->sid = newsid;
2870 isec->initialized = 1;
2871 return 0;
2872 }
2873
2874 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2875 {
2876 const int len = sizeof(XATTR_NAME_SELINUX);
2877 if (buffer && len <= buffer_size)
2878 memcpy(buffer, XATTR_NAME_SELINUX, len);
2879 return len;
2880 }
2881
2882 static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
2883 {
2884 struct inode_security_struct *isec = inode->i_security;
2885 *secid = isec->sid;
2886 }
2887
2888 /* file security operations */
2889
2890 static int selinux_revalidate_file_permission(struct file *file, int mask)
2891 {
2892 const struct cred *cred = current_cred();
2893 struct inode *inode = file->f_path.dentry->d_inode;
2894
2895 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2896 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2897 mask |= MAY_APPEND;
2898
2899 return file_has_perm(cred, file,
2900 file_mask_to_av(inode->i_mode, mask));
2901 }
2902
2903 static int selinux_file_permission(struct file *file, int mask)
2904 {
2905 struct inode *inode = file->f_path.dentry->d_inode;
2906 struct file_security_struct *fsec = file->f_security;
2907 struct inode_security_struct *isec = inode->i_security;
2908 u32 sid = current_sid();
2909
2910 if (!mask)
2911 /* No permission to check. Existence test. */
2912 return 0;
2913
2914 if (sid == fsec->sid && fsec->isid == isec->sid &&
2915 fsec->pseqno == avc_policy_seqno())
2916 /* No change since dentry_open check. */
2917 return 0;
2918
2919 return selinux_revalidate_file_permission(file, mask);
2920 }
2921
2922 static int selinux_file_alloc_security(struct file *file)
2923 {
2924 return file_alloc_security(file);
2925 }
2926
2927 static void selinux_file_free_security(struct file *file)
2928 {
2929 file_free_security(file);
2930 }
2931
2932 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2933 unsigned long arg)
2934 {
2935 const struct cred *cred = current_cred();
2936 u32 av = 0;
2937
2938 if (_IOC_DIR(cmd) & _IOC_WRITE)
2939 av |= FILE__WRITE;
2940 if (_IOC_DIR(cmd) & _IOC_READ)
2941 av |= FILE__READ;
2942 if (!av)
2943 av = FILE__IOCTL;
2944
2945 return file_has_perm(cred, file, av);
2946 }
2947
2948 static int default_noexec;
2949
2950 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2951 {
2952 const struct cred *cred = current_cred();
2953 int rc = 0;
2954
2955 if (default_noexec &&
2956 (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
2957 /*
2958 * We are making executable an anonymous mapping or a
2959 * private file mapping that will also be writable.
2960 * This has an additional check.
2961 */
2962 rc = cred_has_perm(cred, cred, PROCESS__EXECMEM);
2963 if (rc)
2964 goto error;
2965 }
2966
2967 if (file) {
2968 /* read access is always possible with a mapping */
2969 u32 av = FILE__READ;
2970
2971 /* write access only matters if the mapping is shared */
2972 if (shared && (prot & PROT_WRITE))
2973 av |= FILE__WRITE;
2974
2975 if (prot & PROT_EXEC)
2976 av |= FILE__EXECUTE;
2977
2978 return file_has_perm(cred, file, av);
2979 }
2980
2981 error:
2982 return rc;
2983 }
2984
2985 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
2986 unsigned long prot, unsigned long flags,
2987 unsigned long addr, unsigned long addr_only)
2988 {
2989 int rc = 0;
2990 u32 sid = current_sid();
2991
2992 /*
2993 * notice that we are intentionally putting the SELinux check before
2994 * the secondary cap_file_mmap check. This is such a likely attempt
2995 * at bad behaviour/exploit that we always want to get the AVC, even
2996 * if DAC would have also denied the operation.
2997 */
2998 if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
2999 rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
3000 MEMPROTECT__MMAP_ZERO, NULL);
3001 if (rc)
3002 return rc;
3003 }
3004
3005 /* do DAC check on address space usage */
3006 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
3007 if (rc || addr_only)
3008 return rc;
3009
3010 if (selinux_checkreqprot)
3011 prot = reqprot;
3012
3013 return file_map_prot_check(file, prot,
3014 (flags & MAP_TYPE) == MAP_SHARED);
3015 }
3016
3017 static int selinux_file_mprotect(struct vm_area_struct *vma,
3018 unsigned long reqprot,
3019 unsigned long prot)
3020 {
3021 const struct cred *cred = current_cred();
3022
3023 if (selinux_checkreqprot)
3024 prot = reqprot;
3025
3026 if (default_noexec &&
3027 (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
3028 int rc = 0;
3029 if (vma->vm_start >= vma->vm_mm->start_brk &&
3030 vma->vm_end <= vma->vm_mm->brk) {
3031 rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP);
3032 } else if (!vma->vm_file &&
3033 vma->vm_start <= vma->vm_mm->start_stack &&
3034 vma->vm_end >= vma->vm_mm->start_stack) {
3035 rc = current_has_perm(current, PROCESS__EXECSTACK);
3036 } else if (vma->vm_file && vma->anon_vma) {
3037 /*
3038 * We are making executable a file mapping that has
3039 * had some COW done. Since pages might have been
3040 * written, check ability to execute the possibly
3041 * modified content. This typically should only
3042 * occur for text relocations.
3043 */
3044 rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
3045 }
3046 if (rc)
3047 return rc;
3048 }
3049
3050 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
3051 }
3052
3053 static int selinux_file_lock(struct file *file, unsigned int cmd)
3054 {
3055 const struct cred *cred = current_cred();
3056
3057 return file_has_perm(cred, file, FILE__LOCK);
3058 }
3059
3060 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
3061 unsigned long arg)
3062 {
3063 const struct cred *cred = current_cred();
3064 int err = 0;
3065
3066 switch (cmd) {
3067 case F_SETFL:
3068 if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
3069 err = -EINVAL;
3070 break;
3071 }
3072
3073 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
3074 err = file_has_perm(cred, file, FILE__WRITE);
3075 break;
3076 }
3077 /* fall through */
3078 case F_SETOWN:
3079 case F_SETSIG:
3080 case F_GETFL:
3081 case F_GETOWN:
3082 case F_GETSIG:
3083 /* Just check FD__USE permission */
3084 err = file_has_perm(cred, file, 0);
3085 break;
3086 case F_GETLK:
3087 case F_SETLK:
3088 case F_SETLKW:
3089 #if BITS_PER_LONG == 32
3090 case F_GETLK64:
3091 case F_SETLK64:
3092 case F_SETLKW64:
3093 #endif
3094 if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
3095 err = -EINVAL;
3096 break;
3097 }
3098 err = file_has_perm(cred, file, FILE__LOCK);
3099 break;
3100 }
3101
3102 return err;
3103 }
3104
3105 static int selinux_file_set_fowner(struct file *file)
3106 {
3107 struct file_security_struct *fsec;
3108
3109 fsec = file->f_security;
3110 fsec->fown_sid = current_sid();
3111
3112 return 0;
3113 }
3114
3115 static int selinux_file_send_sigiotask(struct task_struct *tsk,
3116 struct fown_struct *fown, int signum)
3117 {
3118 struct file *file;
3119 u32 sid = task_sid(tsk);
3120 u32 perm;
3121 struct file_security_struct *fsec;
3122
3123 /* struct fown_struct is never outside the context of a struct file */
3124 file = container_of(fown, struct file, f_owner);
3125
3126 fsec = file->f_security;
3127
3128 if (!signum)
3129 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
3130 else
3131 perm = signal_to_av(signum);
3132
3133 return avc_has_perm(fsec->fown_sid, sid,
3134 SECCLASS_PROCESS, perm, NULL);
3135 }
3136
3137 static int selinux_file_receive(struct file *file)
3138 {
3139 const struct cred *cred = current_cred();
3140
3141 return file_has_perm(cred, file, file_to_av(file));
3142 }
3143
3144 static int selinux_dentry_open(struct file *file, const struct cred *cred)
3145 {
3146 struct file_security_struct *fsec;
3147 struct inode *inode;
3148 struct inode_security_struct *isec;
3149
3150 inode = file->f_path.dentry->d_inode;
3151 fsec = file->f_security;
3152 isec = inode->i_security;
3153 /*
3154 * Save inode label and policy sequence number
3155 * at open-time so that selinux_file_permission
3156 * can determine whether revalidation is necessary.
3157 * Task label is already saved in the file security
3158 * struct as its SID.
3159 */
3160 fsec->isid = isec->sid;
3161 fsec->pseqno = avc_policy_seqno();
3162 /*
3163 * Since the inode label or policy seqno may have changed
3164 * between the selinux_inode_permission check and the saving
3165 * of state above, recheck that access is still permitted.
3166 * Otherwise, access might never be revalidated against the
3167 * new inode label or new policy.
3168 * This check is not redundant - do not remove.
3169 */
3170 return inode_has_perm(cred, inode, open_file_to_av(file), NULL);
3171 }
3172
3173 /* task security operations */
3174
3175 static int selinux_task_create(unsigned long clone_flags)
3176 {
3177 return current_has_perm(current, PROCESS__FORK);
3178 }
3179
3180 /*
3181 * allocate the SELinux part of blank credentials
3182 */
3183 static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp)
3184 {
3185 struct task_security_struct *tsec;
3186
3187 tsec = kzalloc(sizeof(struct task_security_struct), gfp);
3188 if (!tsec)
3189 return -ENOMEM;
3190
3191 cred->security = tsec;
3192 return 0;
3193 }
3194
3195 /*
3196 * detach and free the LSM part of a set of credentials
3197 */
3198 static void selinux_cred_free(struct cred *cred)
3199 {
3200 struct task_security_struct *tsec = cred->security;
3201
3202 BUG_ON((unsigned long) cred->security < PAGE_SIZE);
3203 cred->security = (void *) 0x7UL;
3204 kfree(tsec);
3205 }
3206
3207 /*
3208 * prepare a new set of credentials for modification
3209 */
3210 static int selinux_cred_prepare(struct cred *new, const struct cred *old,
3211 gfp_t gfp)
3212 {
3213 const struct task_security_struct *old_tsec;
3214 struct task_security_struct *tsec;
3215
3216 old_tsec = old->security;
3217
3218 tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp);
3219 if (!tsec)
3220 return -ENOMEM;
3221
3222 new->security = tsec;
3223 return 0;
3224 }
3225
3226 /*
3227 * transfer the SELinux data to a blank set of creds
3228 */
3229 static void selinux_cred_transfer(struct cred *new, const struct cred *old)
3230 {
3231 const struct task_security_struct *old_tsec = old->security;
3232 struct task_security_struct *tsec = new->security;
3233
3234 *tsec = *old_tsec;
3235 }
3236
3237 /*
3238 * set the security data for a kernel service
3239 * - all the creation contexts are set to unlabelled
3240 */
3241 static int selinux_kernel_act_as(struct cred *new, u32 secid)
3242 {
3243 struct task_security_struct *tsec = new->security;
3244 u32 sid = current_sid();
3245 int ret;
3246
3247 ret = avc_has_perm(sid, secid,
3248 SECCLASS_KERNEL_SERVICE,
3249 KERNEL_SERVICE__USE_AS_OVERRIDE,
3250 NULL);
3251 if (ret == 0) {
3252 tsec->sid = secid;
3253 tsec->create_sid = 0;
3254 tsec->keycreate_sid = 0;
3255 tsec->sockcreate_sid = 0;
3256 }
3257 return ret;
3258 }
3259
3260 /*
3261 * set the file creation context in a security record to the same as the
3262 * objective context of the specified inode
3263 */
3264 static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
3265 {
3266 struct inode_security_struct *isec = inode->i_security;
3267 struct task_security_struct *tsec = new->security;
3268 u32 sid = current_sid();
3269 int ret;
3270
3271 ret = avc_has_perm(sid, isec->sid,
3272 SECCLASS_KERNEL_SERVICE,
3273 KERNEL_SERVICE__CREATE_FILES_AS,
3274 NULL);
3275
3276 if (ret == 0)
3277 tsec->create_sid = isec->sid;
3278 return ret;
3279 }
3280
3281 static int selinux_kernel_module_request(char *kmod_name)
3282 {
3283 u32 sid;
3284 struct common_audit_data ad;
3285
3286 sid = task_sid(current);
3287
3288 COMMON_AUDIT_DATA_INIT(&ad, KMOD);
3289 ad.u.kmod_name = kmod_name;
3290
3291 return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM,
3292 SYSTEM__MODULE_REQUEST, &ad);
3293 }
3294
3295 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
3296 {
3297 return current_has_perm(p, PROCESS__SETPGID);
3298 }
3299
3300 static int selinux_task_getpgid(struct task_struct *p)
3301 {
3302 return current_has_perm(p, PROCESS__GETPGID);
3303 }
3304
3305 static int selinux_task_getsid(struct task_struct *p)
3306 {
3307 return current_has_perm(p, PROCESS__GETSESSION);
3308 }
3309
3310 static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
3311 {
3312 *secid = task_sid(p);
3313 }
3314
3315 static int selinux_task_setnice(struct task_struct *p, int nice)
3316 {
3317 int rc;
3318
3319 rc = cap_task_setnice(p, nice);
3320 if (rc)
3321 return rc;
3322
3323 return current_has_perm(p, PROCESS__SETSCHED);
3324 }
3325
3326 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
3327 {
3328 int rc;
3329
3330 rc = cap_task_setioprio(p, ioprio);
3331 if (rc)
3332 return rc;
3333
3334 return current_has_perm(p, PROCESS__SETSCHED);
3335 }
3336
3337 static int selinux_task_getioprio(struct task_struct *p)
3338 {
3339 return current_has_perm(p, PROCESS__GETSCHED);
3340 }
3341
3342 static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
3343 struct rlimit *new_rlim)
3344 {
3345 struct rlimit *old_rlim = p->signal->rlim + resource;
3346
3347 /* Control the ability to change the hard limit (whether
3348 lowering or raising it), so that the hard limit can
3349 later be used as a safe reset point for the soft limit
3350 upon context transitions. See selinux_bprm_committing_creds. */
3351 if (old_rlim->rlim_max != new_rlim->rlim_max)
3352 return current_has_perm(p, PROCESS__SETRLIMIT);
3353
3354 return 0;
3355 }
3356
3357 static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
3358 {
3359 int rc;
3360
3361 rc = cap_task_setscheduler(p, policy, lp);
3362 if (rc)
3363 return rc;
3364
3365 return current_has_perm(p, PROCESS__SETSCHED);
3366 }
3367
3368 static int selinux_task_getscheduler(struct task_struct *p)
3369 {
3370 return current_has_perm(p, PROCESS__GETSCHED);
3371 }
3372
3373 static int selinux_task_movememory(struct task_struct *p)
3374 {
3375 return current_has_perm(p, PROCESS__SETSCHED);
3376 }
3377
3378 static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
3379 int sig, u32 secid)
3380 {
3381 u32 perm;
3382 int rc;
3383
3384 if (!sig)
3385 perm = PROCESS__SIGNULL; /* null signal; existence test */
3386 else
3387 perm = signal_to_av(sig);
3388 if (secid)
3389 rc = avc_has_perm(secid, task_sid(p),
3390 SECCLASS_PROCESS, perm, NULL);
3391 else
3392 rc = current_has_perm(p, perm);
3393 return rc;
3394 }
3395
3396 static int selinux_task_wait(struct task_struct *p)
3397 {
3398 return task_has_perm(p, current, PROCESS__SIGCHLD);
3399 }
3400
3401 static void selinux_task_to_inode(struct task_struct *p,
3402 struct inode *inode)
3403 {
3404 struct inode_security_struct *isec = inode->i_security;
3405 u32 sid = task_sid(p);
3406
3407 isec->sid = sid;
3408 isec->initialized = 1;
3409 }
3410
3411 /* Returns error only if unable to parse addresses */
3412 static int selinux_parse_skb_ipv4(struct sk_buff *skb,
3413 struct common_audit_data *ad, u8 *proto)
3414 {
3415 int offset, ihlen, ret = -EINVAL;
3416 struct iphdr _iph, *ih;
3417
3418 offset = skb_network_offset(skb);
3419 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
3420 if (ih == NULL)
3421 goto out;
3422
3423 ihlen = ih->ihl * 4;
3424 if (ihlen < sizeof(_iph))
3425 goto out;
3426
3427 ad->u.net.v4info.saddr = ih->saddr;
3428 ad->u.net.v4info.daddr = ih->daddr;
3429 ret = 0;
3430
3431 if (proto)
3432 *proto = ih->protocol;
3433
3434 switch (ih->protocol) {
3435 case IPPROTO_TCP: {
3436 struct tcphdr _tcph, *th;
3437
3438 if (ntohs(ih->frag_off) & IP_OFFSET)
3439 break;
3440
3441 offset += ihlen;
3442 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3443 if (th == NULL)
3444 break;
3445
3446 ad->u.net.sport = th->source;
3447 ad->u.net.dport = th->dest;
3448 break;
3449 }
3450
3451 case IPPROTO_UDP: {
3452 struct udphdr _udph, *uh;
3453
3454 if (ntohs(ih->frag_off) & IP_OFFSET)
3455 break;
3456
3457 offset += ihlen;
3458 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3459 if (uh == NULL)
3460 break;
3461
3462 ad->u.net.sport = uh->source;
3463 ad->u.net.dport = uh->dest;
3464 break;
3465 }
3466
3467 case IPPROTO_DCCP: {
3468 struct dccp_hdr _dccph, *dh;
3469
3470 if (ntohs(ih->frag_off) & IP_OFFSET)
3471 break;
3472
3473 offset += ihlen;
3474 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3475 if (dh == NULL)
3476 break;
3477
3478 ad->u.net.sport = dh->dccph_sport;
3479 ad->u.net.dport = dh->dccph_dport;
3480 break;
3481 }
3482
3483 default:
3484 break;
3485 }
3486 out:
3487 return ret;
3488 }
3489
3490 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3491
3492 /* Returns error only if unable to parse addresses */
3493 static int selinux_parse_skb_ipv6(struct sk_buff *skb,
3494 struct common_audit_data *ad, u8 *proto)
3495 {
3496 u8 nexthdr;
3497 int ret = -EINVAL, offset;
3498 struct ipv6hdr _ipv6h, *ip6;
3499
3500 offset = skb_network_offset(skb);
3501 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3502 if (ip6 == NULL)
3503 goto out;
3504
3505 ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
3506 ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
3507 ret = 0;
3508
3509 nexthdr = ip6->nexthdr;
3510 offset += sizeof(_ipv6h);
3511 offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
3512 if (offset < 0)
3513 goto out;
3514
3515 if (proto)
3516 *proto = nexthdr;
3517
3518 switch (nexthdr) {
3519 case IPPROTO_TCP: {
3520 struct tcphdr _tcph, *th;
3521
3522 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3523 if (th == NULL)
3524 break;
3525
3526 ad->u.net.sport = th->source;
3527 ad->u.net.dport = th->dest;
3528 break;
3529 }
3530
3531 case IPPROTO_UDP: {
3532 struct udphdr _udph, *uh;
3533
3534 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3535 if (uh == NULL)
3536 break;
3537
3538 ad->u.net.sport = uh->source;
3539 ad->u.net.dport = uh->dest;
3540 break;
3541 }
3542
3543 case IPPROTO_DCCP: {
3544 struct dccp_hdr _dccph, *dh;
3545
3546 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3547 if (dh == NULL)
3548 break;
3549
3550 ad->u.net.sport = dh->dccph_sport;
3551 ad->u.net.dport = dh->dccph_dport;
3552 break;
3553 }
3554
3555 /* includes fragments */
3556 default:
3557 break;
3558 }
3559 out:
3560 return ret;
3561 }
3562
3563 #endif /* IPV6 */
3564
3565 static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad,
3566 char **_addrp, int src, u8 *proto)
3567 {
3568 char *addrp;
3569 int ret;
3570
3571 switch (ad->u.net.family) {
3572 case PF_INET:
3573 ret = selinux_parse_skb_ipv4(skb, ad, proto);
3574 if (ret)
3575 goto parse_error;
3576 addrp = (char *)(src ? &ad->u.net.v4info.saddr :
3577 &ad->u.net.v4info.daddr);
3578 goto okay;
3579
3580 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3581 case PF_INET6:
3582 ret = selinux_parse_skb_ipv6(skb, ad, proto);
3583 if (ret)
3584 goto parse_error;
3585 addrp = (char *)(src ? &ad->u.net.v6info.saddr :
3586 &ad->u.net.v6info.daddr);
3587 goto okay;
3588 #endif /* IPV6 */
3589 default:
3590 addrp = NULL;
3591 goto okay;
3592 }
3593
3594 parse_error:
3595 printk(KERN_WARNING
3596 "SELinux: failure in selinux_parse_skb(),"
3597 " unable to parse packet\n");
3598 return ret;
3599
3600 okay:
3601 if (_addrp)
3602 *_addrp = addrp;
3603 return 0;
3604 }
3605
3606 /**
3607 * selinux_skb_peerlbl_sid - Determine the peer label of a packet
3608 * @skb: the packet
3609 * @family: protocol family
3610 * @sid: the packet's peer label SID
3611 *
3612 * Description:
3613 * Check the various different forms of network peer labeling and determine
3614 * the peer label/SID for the packet; most of the magic actually occurs in
3615 * the security server function security_net_peersid_cmp(). The function
3616 * returns zero if the value in @sid is valid (although it may be SECSID_NULL)
3617 * or -EACCES if @sid is invalid due to inconsistencies with the different
3618 * peer labels.
3619 *
3620 */
3621 static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
3622 {
3623 int err;
3624 u32 xfrm_sid;
3625 u32 nlbl_sid;
3626 u32 nlbl_type;
3627
3628 selinux_skb_xfrm_sid(skb, &xfrm_sid);
3629 selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
3630
3631 err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid);
3632 if (unlikely(err)) {
3633 printk(KERN_WARNING
3634 "SELinux: failure in selinux_skb_peerlbl_sid(),"
3635 " unable to determine packet's peer label\n");
3636 return -EACCES;
3637 }
3638
3639 return 0;
3640 }
3641
3642 /* socket security operations */
3643
3644 static u32 socket_sockcreate_sid(const struct task_security_struct *tsec)
3645 {
3646 return tsec->sockcreate_sid ? : tsec->sid;
3647 }
3648
3649 static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms)
3650 {
3651 struct sk_security_struct *sksec = sk->sk_security;
3652 struct common_audit_data ad;
3653 u32 tsid = task_sid(task);
3654
3655 if (sksec->sid == SECINITSID_KERNEL)
3656 return 0;
3657
3658 COMMON_AUDIT_DATA_INIT(&ad, NET);
3659 ad.u.net.sk = sk;
3660
3661 return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad);
3662 }
3663
3664 static int selinux_socket_create(int family, int type,
3665 int protocol, int kern)
3666 {
3667 const struct task_security_struct *tsec = current_security();
3668 u32 newsid;
3669 u16 secclass;
3670
3671 if (kern)
3672 return 0;
3673
3674 newsid = socket_sockcreate_sid(tsec);
3675 secclass = socket_type_to_security_class(family, type, protocol);
3676 return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
3677 }
3678
3679 static int selinux_socket_post_create(struct socket *sock, int family,
3680 int type, int protocol, int kern)
3681 {
3682 const struct task_security_struct *tsec = current_security();
3683 struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
3684 struct sk_security_struct *sksec;
3685 int err = 0;
3686
3687 if (kern)
3688 isec->sid = SECINITSID_KERNEL;
3689 else
3690 isec->sid = socket_sockcreate_sid(tsec);
3691
3692 isec->sclass = socket_type_to_security_class(family, type, protocol);
3693 isec->initialized = 1;
3694
3695 if (sock->sk) {
3696 sksec = sock->sk->sk_security;
3697 sksec->sid = isec->sid;
3698 sksec->sclass = isec->sclass;
3699 err = selinux_netlbl_socket_post_create(sock->sk, family);
3700 }
3701
3702 return err;
3703 }
3704
3705 /* Range of port numbers used to automatically bind.
3706 Need to determine whether we should perform a name_bind
3707 permission check between the socket and the port number. */
3708
3709 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
3710 {
3711 struct sock *sk = sock->sk;
3712 u16 family;
3713 int err;
3714
3715 err = sock_has_perm(current, sk, SOCKET__BIND);
3716 if (err)
3717 goto out;
3718
3719 /*
3720 * If PF_INET or PF_INET6, check name_bind permission for the port.
3721 * Multiple address binding for SCTP is not supported yet: we just
3722 * check the first address now.
3723 */
3724 family = sk->sk_family;
3725 if (family == PF_INET || family == PF_INET6) {
3726 char *addrp;
3727 struct sk_security_struct *sksec = sk->sk_security;
3728 struct common_audit_data ad;
3729 struct sockaddr_in *addr4 = NULL;
3730 struct sockaddr_in6 *addr6 = NULL;
3731 unsigned short snum;
3732 u32 sid, node_perm;
3733
3734 if (family == PF_INET) {
3735 addr4 = (struct sockaddr_in *)address;
3736 snum = ntohs(addr4->sin_port);
3737 addrp = (char *)&addr4->sin_addr.s_addr;
3738 } else {
3739 addr6 = (struct sockaddr_in6 *)address;
3740 snum = ntohs(addr6->sin6_port);
3741 addrp = (char *)&addr6->sin6_addr.s6_addr;
3742 }
3743
3744 if (snum) {
3745 int low, high;
3746
3747 inet_get_local_port_range(&low, &high);
3748
3749 if (snum < max(PROT_SOCK, low) || snum > high) {
3750 err = sel_netport_sid(sk->sk_protocol,
3751 snum, &sid);
3752 if (err)
3753 goto out;
3754 COMMON_AUDIT_DATA_INIT(&ad, NET);
3755 ad.u.net.sport = htons(snum);
3756 ad.u.net.family = family;
3757 err = avc_has_perm(sksec->sid, sid,
3758 sksec->sclass,
3759 SOCKET__NAME_BIND, &ad);
3760 if (err)
3761 goto out;
3762 }
3763 }
3764
3765 switch (sksec->sclass) {
3766 case SECCLASS_TCP_SOCKET:
3767 node_perm = TCP_SOCKET__NODE_BIND;
3768 break;
3769
3770 case SECCLASS_UDP_SOCKET:
3771 node_perm = UDP_SOCKET__NODE_BIND;
3772 break;
3773
3774 case SECCLASS_DCCP_SOCKET:
3775 node_perm = DCCP_SOCKET__NODE_BIND;
3776 break;
3777
3778 default:
3779 node_perm = RAWIP_SOCKET__NODE_BIND;
3780 break;
3781 }
3782
3783 err = sel_netnode_sid(addrp, family, &sid);
3784 if (err)
3785 goto out;
3786
3787 COMMON_AUDIT_DATA_INIT(&ad, NET);
3788 ad.u.net.sport = htons(snum);
3789 ad.u.net.family = family;
3790
3791 if (family == PF_INET)
3792 ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3793 else
3794 ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3795
3796 err = avc_has_perm(sksec->sid, sid,
3797 sksec->sclass, node_perm, &ad);
3798 if (err)
3799 goto out;
3800 }
3801 out:
3802 return err;
3803 }
3804
3805 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3806 {
3807 struct sock *sk = sock->sk;
3808 struct sk_security_struct *sksec = sk->sk_security;
3809 int err;
3810
3811 err = sock_has_perm(current, sk, SOCKET__CONNECT);
3812 if (err)
3813 return err;
3814
3815 /*
3816 * If a TCP or DCCP socket, check name_connect permission for the port.
3817 */
3818 if (sksec->sclass == SECCLASS_TCP_SOCKET ||
3819 sksec->sclass == SECCLASS_DCCP_SOCKET) {
3820 struct common_audit_data ad;
3821 struct sockaddr_in *addr4 = NULL;
3822 struct sockaddr_in6 *addr6 = NULL;
3823 unsigned short snum;
3824 u32 sid, perm;
3825
3826 if (sk->sk_family == PF_INET) {
3827 addr4 = (struct sockaddr_in *)address;
3828 if (addrlen < sizeof(struct sockaddr_in))
3829 return -EINVAL;
3830 snum = ntohs(addr4->sin_port);
3831 } else {
3832 addr6 = (struct sockaddr_in6 *)address;
3833 if (addrlen < SIN6_LEN_RFC2133)
3834 return -EINVAL;
3835 snum = ntohs(addr6->sin6_port);
3836 }
3837
3838 err = sel_netport_sid(sk->sk_protocol, snum, &sid);
3839 if (err)
3840 goto out;
3841
3842 perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ?
3843 TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;
3844
3845 COMMON_AUDIT_DATA_INIT(&ad, NET);
3846 ad.u.net.dport = htons(snum);
3847 ad.u.net.family = sk->sk_family;
3848 err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad);
3849 if (err)
3850 goto out;
3851 }
3852
3853 err = selinux_netlbl_socket_connect(sk, address);
3854
3855 out:
3856 return err;
3857 }
3858
3859 static int selinux_socket_listen(struct socket *sock, int backlog)
3860 {
3861 return sock_has_perm(current, sock->sk, SOCKET__LISTEN);
3862 }
3863
3864 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3865 {
3866 int err;
3867 struct inode_security_struct *isec;
3868 struct inode_security_struct *newisec;
3869
3870 err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT);
3871 if (err)
3872 return err;
3873
3874 newisec = SOCK_INODE(newsock)->i_security;
3875
3876 isec = SOCK_INODE(sock)->i_security;
3877 newisec->sclass = isec->sclass;
3878 newisec->sid = isec->sid;
3879 newisec->initialized = 1;
3880
3881 return 0;
3882 }
3883
3884 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3885 int size)
3886 {
3887 return sock_has_perm(current, sock->sk, SOCKET__WRITE);
3888 }
3889
3890 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3891 int size, int flags)
3892 {
3893 return sock_has_perm(current, sock->sk, SOCKET__READ);
3894 }
3895
3896 static int selinux_socket_getsockname(struct socket *sock)
3897 {
3898 return sock_has_perm(current, sock->sk, SOCKET__GETATTR);
3899 }
3900
3901 static int selinux_socket_getpeername(struct socket *sock)
3902 {
3903 return sock_has_perm(current, sock->sk, SOCKET__GETATTR);
3904 }
3905
3906 static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
3907 {
3908 int err;
3909
3910 err = sock_has_perm(current, sock->sk, SOCKET__SETOPT);
3911 if (err)
3912 return err;
3913
3914 return selinux_netlbl_socket_setsockopt(sock, level, optname);
3915 }
3916
3917 static int selinux_socket_getsockopt(struct socket *sock, int level,
3918 int optname)
3919 {
3920 return sock_has_perm(current, sock->sk, SOCKET__GETOPT);
3921 }
3922
3923 static int selinux_socket_shutdown(struct socket *sock, int how)
3924 {
3925 return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN);
3926 }
3927
3928 static int selinux_socket_unix_stream_connect(struct socket *sock,
3929 struct socket *other,
3930 struct sock *newsk)
3931 {
3932 struct sk_security_struct *sksec_sock = sock->sk->sk_security;
3933 struct sk_security_struct *sksec_other = other->sk->sk_security;
3934 struct sk_security_struct *sksec_new = newsk->sk_security;
3935 struct common_audit_data ad;
3936 int err;
3937
3938 COMMON_AUDIT_DATA_INIT(&ad, NET);
3939 ad.u.net.sk = other->sk;
3940
3941 err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
3942 sksec_other->sclass,
3943 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3944 if (err)
3945 return err;
3946
3947 /* server child socket */
3948 sksec_new->peer_sid = sksec_sock->sid;
3949 err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid,
3950 &sksec_new->sid);
3951 if (err)
3952 return err;
3953
3954 /* connecting socket */
3955 sksec_sock->peer_sid = sksec_new->sid;
3956
3957 return 0;
3958 }
3959
3960 static int selinux_socket_unix_may_send(struct socket *sock,
3961 struct socket *other)
3962 {
3963 struct sk_security_struct *ssec = sock->sk->sk_security;
3964 struct sk_security_struct *osec = other->sk->sk_security;
3965 struct common_audit_data ad;
3966
3967 COMMON_AUDIT_DATA_INIT(&ad, NET);
3968 ad.u.net.sk = other->sk;
3969
3970 return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO,
3971 &ad);
3972 }
3973
3974 static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
3975 u32 peer_sid,
3976 struct common_audit_data *ad)
3977 {
3978 int err;
3979 u32 if_sid;
3980 u32 node_sid;
3981
3982 err = sel_netif_sid(ifindex, &if_sid);
3983 if (err)
3984 return err;
3985 err = avc_has_perm(peer_sid, if_sid,
3986 SECCLASS_NETIF, NETIF__INGRESS, ad);
3987 if (err)
3988 return err;
3989
3990 err = sel_netnode_sid(addrp, family, &node_sid);
3991 if (err)
3992 return err;
3993 return avc_has_perm(peer_sid, node_sid,
3994 SECCLASS_NODE, NODE__RECVFROM, ad);
3995 }
3996
3997 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
3998 u16 family)
3999 {
4000 int err = 0;
4001 struct sk_security_struct *sksec = sk->sk_security;
4002 u32 peer_sid;
4003 u32 sk_sid = sksec->sid;
4004 struct common_audit_data ad;
4005 char *addrp;
4006
4007 COMMON_AUDIT_DATA_INIT(&ad, NET);
4008 ad.u.net.netif = skb->skb_iif;
4009 ad.u.net.family = family;
4010 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4011 if (err)
4012 return err;
4013
4014 if (selinux_secmark_enabled()) {
4015 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4016 PACKET__RECV, &ad);
4017 if (err)
4018 return err;
4019 }
4020
4021 if (selinux_policycap_netpeer) {
4022 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4023 if (err)
4024 return err;
4025 err = avc_has_perm(sk_sid, peer_sid,
4026 SECCLASS_PEER, PEER__RECV, &ad);
4027 if (err)
4028 selinux_netlbl_err(skb, err, 0);
4029 } else {
4030 err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
4031 if (err)
4032 return err;
4033 err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
4034 }
4035
4036 return err;
4037 }
4038
4039 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4040 {
4041 int err;
4042 struct sk_security_struct *sksec = sk->sk_security;
4043 u16 family = sk->sk_family;
4044 u32 sk_sid = sksec->sid;
4045 struct common_audit_data ad;
4046 char *addrp;
4047 u8 secmark_active;
4048 u8 peerlbl_active;
4049
4050 if (family != PF_INET && family != PF_INET6)
4051 return 0;
4052
4053 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
4054 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4055 family = PF_INET;
4056
4057 /* If any sort of compatibility mode is enabled then handoff processing
4058 * to the selinux_sock_rcv_skb_compat() function to deal with the
4059 * special handling. We do this in an attempt to keep this function
4060 * as fast and as clean as possible. */
4061 if (!selinux_policycap_netpeer)
4062 return selinux_sock_rcv_skb_compat(sk, skb, family);
4063
4064 secmark_active = selinux_secmark_enabled();
4065 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4066 if (!secmark_active && !peerlbl_active)
4067 return 0;
4068
4069 COMMON_AUDIT_DATA_INIT(&ad, NET);
4070 ad.u.net.netif = skb->skb_iif;
4071 ad.u.net.family = family;
4072 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4073 if (err)
4074 return err;
4075
4076 if (peerlbl_active) {
4077 u32 peer_sid;
4078
4079 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4080 if (err)
4081 return err;
4082 err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family,
4083 peer_sid, &ad);
4084 if (err) {
4085 selinux_netlbl_err(skb, err, 0);
4086 return err;
4087 }
4088 err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
4089 PEER__RECV, &ad);
4090 if (err)
4091 selinux_netlbl_err(skb, err, 0);
4092 }
4093
4094 if (secmark_active) {
4095 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4096 PACKET__RECV, &ad);
4097 if (err)
4098 return err;
4099 }
4100
4101 return err;
4102 }
4103
4104 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
4105 int __user *optlen, unsigned len)
4106 {
4107 int err = 0;
4108 char *scontext;
4109 u32 scontext_len;
4110 struct sk_security_struct *sksec = sock->sk->sk_security;
4111 u32 peer_sid = SECSID_NULL;
4112
4113 if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
4114 sksec->sclass == SECCLASS_TCP_SOCKET)
4115 peer_sid = sksec->peer_sid;
4116 if (peer_sid == SECSID_NULL)
4117 return -ENOPROTOOPT;
4118
4119 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
4120 if (err)
4121 return err;
4122
4123 if (scontext_len > len) {
4124 err = -ERANGE;
4125 goto out_len;
4126 }
4127
4128 if (copy_to_user(optval, scontext, scontext_len))
4129 err = -EFAULT;
4130
4131 out_len:
4132 if (put_user(scontext_len, optlen))
4133 err = -EFAULT;
4134 kfree(scontext);
4135 return err;
4136 }
4137
4138 static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
4139 {
4140 u32 peer_secid = SECSID_NULL;
4141 u16 family;
4142
4143 if (skb && skb->protocol == htons(ETH_P_IP))
4144 family = PF_INET;
4145 else if (skb && skb->protocol == htons(ETH_P_IPV6))
4146 family = PF_INET6;
4147 else if (sock)
4148 family = sock->sk->sk_family;
4149 else
4150 goto out;
4151
4152 if (sock && family == PF_UNIX)
4153 selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid);
4154 else if (skb)
4155 selinux_skb_peerlbl_sid(skb, family, &peer_secid);
4156
4157 out:
4158 *secid = peer_secid;
4159 if (peer_secid == SECSID_NULL)
4160 return -EINVAL;
4161 return 0;
4162 }
4163
4164 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
4165 {
4166 struct sk_security_struct *sksec;
4167
4168 sksec = kzalloc(sizeof(*sksec), priority);
4169 if (!sksec)
4170 return -ENOMEM;
4171
4172 sksec->peer_sid = SECINITSID_UNLABELED;
4173 sksec->sid = SECINITSID_UNLABELED;
4174 selinux_netlbl_sk_security_reset(sksec);
4175 sk->sk_security = sksec;
4176
4177 return 0;
4178 }
4179
4180 static void selinux_sk_free_security(struct sock *sk)
4181 {
4182 struct sk_security_struct *sksec = sk->sk_security;
4183
4184 sk->sk_security = NULL;
4185 selinux_netlbl_sk_security_free(sksec);
4186 kfree(sksec);
4187 }
4188
4189 static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
4190 {
4191 struct sk_security_struct *sksec = sk->sk_security;
4192 struct sk_security_struct *newsksec = newsk->sk_security;
4193
4194 newsksec->sid = sksec->sid;
4195 newsksec->peer_sid = sksec->peer_sid;
4196 newsksec->sclass = sksec->sclass;
4197
4198 selinux_netlbl_sk_security_reset(newsksec);
4199 }
4200
4201 static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
4202 {
4203 if (!sk)
4204 *secid = SECINITSID_ANY_SOCKET;
4205 else {
4206 struct sk_security_struct *sksec = sk->sk_security;
4207
4208 *secid = sksec->sid;
4209 }
4210 }
4211
4212 static void selinux_sock_graft(struct sock *sk, struct socket *parent)
4213 {
4214 struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
4215 struct sk_security_struct *sksec = sk->sk_security;
4216
4217 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
4218 sk->sk_family == PF_UNIX)
4219 isec->sid = sksec->sid;
4220 sksec->sclass = isec->sclass;
4221 }
4222
4223 static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4224 struct request_sock *req)
4225 {
4226 struct sk_security_struct *sksec = sk->sk_security;
4227 int err;
4228 u16 family = sk->sk_family;
4229 u32 newsid;
4230 u32 peersid;
4231
4232 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4233 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4234 family = PF_INET;
4235
4236 err = selinux_skb_peerlbl_sid(skb, family, &peersid);
4237 if (err)
4238 return err;
4239 if (peersid == SECSID_NULL) {
4240 req->secid = sksec->sid;
4241 req->peer_secid = SECSID_NULL;
4242 } else {
4243 err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
4244 if (err)
4245 return err;
4246 req->secid = newsid;
4247 req->peer_secid = peersid;
4248 }
4249
4250 return selinux_netlbl_inet_conn_request(req, family);
4251 }
4252
4253 static void selinux_inet_csk_clone(struct sock *newsk,
4254 const struct request_sock *req)
4255 {
4256 struct sk_security_struct *newsksec = newsk->sk_security;
4257
4258 newsksec->sid = req->secid;
4259 newsksec->peer_sid = req->peer_secid;
4260 /* NOTE: Ideally, we should also get the isec->sid for the
4261 new socket in sync, but we don't have the isec available yet.
4262 So we will wait until sock_graft to do it, by which
4263 time it will have been created and available. */
4264
4265 /* We don't need to take any sort of lock here as we are the only
4266 * thread with access to newsksec */
4267 selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
4268 }
4269
4270 static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
4271 {
4272 u16 family = sk->sk_family;
4273 struct sk_security_struct *sksec = sk->sk_security;
4274
4275 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4276 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4277 family = PF_INET;
4278
4279 selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
4280 }
4281
4282 static void selinux_req_classify_flow(const struct request_sock *req,
4283 struct flowi *fl)
4284 {
4285 fl->secid = req->secid;
4286 }
4287
4288 static int selinux_tun_dev_create(void)
4289 {
4290 u32 sid = current_sid();
4291
4292 /* we aren't taking into account the "sockcreate" SID since the socket
4293 * that is being created here is not a socket in the traditional sense,
4294 * instead it is a private sock, accessible only to the kernel, and
4295 * representing a wide range of network traffic spanning multiple
4296 * connections unlike traditional sockets - check the TUN driver to
4297 * get a better understanding of why this socket is special */
4298
4299 return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE,
4300 NULL);
4301 }
4302
4303 static void selinux_tun_dev_post_create(struct sock *sk)
4304 {
4305 struct sk_security_struct *sksec = sk->sk_security;
4306
4307 /* we don't currently perform any NetLabel based labeling here and it
4308 * isn't clear that we would want to do so anyway; while we could apply
4309 * labeling without the support of the TUN user the resulting labeled
4310 * traffic from the other end of the connection would almost certainly
4311 * cause confusion to the TUN user that had no idea network labeling
4312 * protocols were being used */
4313
4314 /* see the comments in selinux_tun_dev_create() about why we don't use
4315 * the sockcreate SID here */
4316
4317 sksec->sid = current_sid();
4318 sksec->sclass = SECCLASS_TUN_SOCKET;
4319 }
4320
4321 static int selinux_tun_dev_attach(struct sock *sk)
4322 {
4323 struct sk_security_struct *sksec = sk->sk_security;
4324 u32 sid = current_sid();
4325 int err;
4326
4327 err = avc_has_perm(sid, sksec->sid, SECCLASS_TUN_SOCKET,
4328 TUN_SOCKET__RELABELFROM, NULL);
4329 if (err)
4330 return err;
4331 err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET,
4332 TUN_SOCKET__RELABELTO, NULL);
4333 if (err)
4334 return err;
4335
4336 sksec->sid = sid;
4337
4338 return 0;
4339 }
4340
4341 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
4342 {
4343 int err = 0;
4344 u32 perm;
4345 struct nlmsghdr *nlh;
4346 struct sk_security_struct *sksec = sk->sk_security;
4347
4348 if (skb->len < NLMSG_SPACE(0)) {
4349 err = -EINVAL;
4350 goto out;
4351 }
4352 nlh = nlmsg_hdr(skb);
4353
4354 err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
4355 if (err) {
4356 if (err == -EINVAL) {
4357 audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
4358 "SELinux: unrecognized netlink message"
4359 " type=%hu for sclass=%hu\n",
4360 nlh->nlmsg_type, sksec->sclass);
4361 if (!selinux_enforcing || security_get_allow_unknown())
4362 err = 0;
4363 }
4364
4365 /* Ignore */
4366 if (err == -ENOENT)
4367 err = 0;
4368 goto out;
4369 }
4370
4371 err = sock_has_perm(current, sk, perm);
4372 out:
4373 return err;
4374 }
4375
4376 #ifdef CONFIG_NETFILTER
4377
4378 static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
4379 u16 family)
4380 {
4381 int err;
4382 char *addrp;
4383 u32 peer_sid;
4384 struct common_audit_data ad;
4385 u8 secmark_active;
4386 u8 netlbl_active;
4387 u8 peerlbl_active;
4388
4389 if (!selinux_policycap_netpeer)
4390 return NF_ACCEPT;
4391
4392 secmark_active = selinux_secmark_enabled();
4393 netlbl_active = netlbl_enabled();
4394 peerlbl_active = netlbl_active || selinux_xfrm_enabled();
4395 if (!secmark_active && !peerlbl_active)
4396 return NF_ACCEPT;
4397
4398 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
4399 return NF_DROP;
4400
4401 COMMON_AUDIT_DATA_INIT(&ad, NET);
4402 ad.u.net.netif = ifindex;
4403 ad.u.net.family = family;
4404 if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
4405 return NF_DROP;
4406
4407 if (peerlbl_active) {
4408 err = selinux_inet_sys_rcv_skb(ifindex, addrp, family,
4409 peer_sid, &ad);
4410 if (err) {
4411 selinux_netlbl_err(skb, err, 1);
4412 return NF_DROP;
4413 }
4414 }
4415
4416 if (secmark_active)
4417 if (avc_has_perm(peer_sid, skb->secmark,
4418 SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
4419 return NF_DROP;
4420
4421 if (netlbl_active)
4422 /* we do this in the FORWARD path and not the POST_ROUTING
4423 * path because we want to make sure we apply the necessary
4424 * labeling before IPsec is applied so we can leverage AH
4425 * protection */
4426 if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
4427 return NF_DROP;
4428
4429 return NF_ACCEPT;
4430 }
4431
4432 static unsigned int selinux_ipv4_forward(unsigned int hooknum,
4433 struct sk_buff *skb,
4434 const struct net_device *in,
4435 const struct net_device *out,
4436 int (*okfn)(struct sk_buff *))
4437 {
4438 return selinux_ip_forward(skb, in->ifindex, PF_INET);
4439 }
4440
4441 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4442 static unsigned int selinux_ipv6_forward(unsigned int hooknum,
4443 struct sk_buff *skb,
4444 const struct net_device *in,
4445 const struct net_device *out,
4446 int (*okfn)(struct sk_buff *))
4447 {
4448 return selinux_ip_forward(skb, in->ifindex, PF_INET6);
4449 }
4450 #endif /* IPV6 */
4451
4452 static unsigned int selinux_ip_output(struct sk_buff *skb,
4453 u16 family)
4454 {
4455 u32 sid;
4456
4457 if (!netlbl_enabled())
4458 return NF_ACCEPT;
4459
4460 /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
4461 * because we want to make sure we apply the necessary labeling
4462 * before IPsec is applied so we can leverage AH protection */
4463 if (skb->sk) {
4464 struct sk_security_struct *sksec = skb->sk->sk_security;
4465 sid = sksec->sid;
4466 } else
4467 sid = SECINITSID_KERNEL;
4468 if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
4469 return NF_DROP;
4470
4471 return NF_ACCEPT;
4472 }
4473
4474 static unsigned int selinux_ipv4_output(unsigned int hooknum,
4475 struct sk_buff *skb,
4476 const struct net_device *in,
4477 const struct net_device *out,
4478 int (*okfn)(struct sk_buff *))
4479 {
4480 return selinux_ip_output(skb, PF_INET);
4481 }
4482
4483 static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
4484 int ifindex,
4485 u16 family)
4486 {
4487 struct sock *sk = skb->sk;
4488 struct sk_security_struct *sksec;
4489 struct common_audit_data ad;
4490 char *addrp;
4491 u8 proto;
4492
4493 if (sk == NULL)
4494 return NF_ACCEPT;
4495 sksec = sk->sk_security;
4496
4497 COMMON_AUDIT_DATA_INIT(&ad, NET);
4498 ad.u.net.netif = ifindex;
4499 ad.u.net.family = family;
4500 if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
4501 return NF_DROP;
4502
4503 if (selinux_secmark_enabled())
4504 if (avc_has_perm(sksec->sid, skb->secmark,
4505 SECCLASS_PACKET, PACKET__SEND, &ad))
4506 return NF_DROP;
4507
4508 if (selinux_policycap_netpeer)
4509 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
4510 return NF_DROP;
4511
4512 return NF_ACCEPT;
4513 }
4514
4515 static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
4516 u16 family)
4517 {
4518 u32 secmark_perm;
4519 u32 peer_sid;
4520 struct sock *sk;
4521 struct common_audit_data ad;
4522 char *addrp;
4523 u8 secmark_active;
4524 u8 peerlbl_active;
4525
4526 /* If any sort of compatibility mode is enabled then handoff processing
4527 * to the selinux_ip_postroute_compat() function to deal with the
4528 * special handling. We do this in an attempt to keep this function
4529 * as fast and as clean as possible. */
4530 if (!selinux_policycap_netpeer)
4531 return selinux_ip_postroute_compat(skb, ifindex, family);
4532 #ifdef CONFIG_XFRM
4533 /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
4534 * packet transformation so allow the packet to pass without any checks
4535 * since we'll have another chance to perform access control checks
4536 * when the packet is on it's final way out.
4537 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
4538 * is NULL, in this case go ahead and apply access control. */
4539 if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL)
4540 return NF_ACCEPT;
4541 #endif
4542 secmark_active = selinux_secmark_enabled();
4543 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4544 if (!secmark_active && !peerlbl_active)
4545 return NF_ACCEPT;
4546
4547 /* if the packet is being forwarded then get the peer label from the
4548 * packet itself; otherwise check to see if it is from a local
4549 * application or the kernel, if from an application get the peer label
4550 * from the sending socket, otherwise use the kernel's sid */
4551 sk = skb->sk;
4552 if (sk == NULL) {
4553 switch (family) {
4554 case PF_INET:
4555 if (IPCB(skb)->flags & IPSKB_FORWARDED)
4556 secmark_perm = PACKET__FORWARD_OUT;
4557 else
4558 secmark_perm = PACKET__SEND;
4559 break;
4560 case PF_INET6:
4561 if (IP6CB(skb)->flags & IP6SKB_FORWARDED)
4562 secmark_perm = PACKET__FORWARD_OUT;
4563 else
4564 secmark_perm = PACKET__SEND;
4565 break;
4566 default:
4567 return NF_DROP;
4568 }
4569 if (secmark_perm == PACKET__FORWARD_OUT) {
4570 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
4571 return NF_DROP;
4572 } else
4573 peer_sid = SECINITSID_KERNEL;
4574 } else {
4575 struct sk_security_struct *sksec = sk->sk_security;
4576 peer_sid = sksec->sid;
4577 secmark_perm = PACKET__SEND;
4578 }
4579
4580 COMMON_AUDIT_DATA_INIT(&ad, NET);
4581 ad.u.net.netif = ifindex;
4582 ad.u.net.family = family;
4583 if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
4584 return NF_DROP;
4585
4586 if (secmark_active)
4587 if (avc_has_perm(peer_sid, skb->secmark,
4588 SECCLASS_PACKET, secmark_perm, &ad))
4589 return NF_DROP;
4590
4591 if (peerlbl_active) {
4592 u32 if_sid;
4593 u32 node_sid;
4594
4595 if (sel_netif_sid(ifindex, &if_sid))
4596 return NF_DROP;
4597 if (avc_has_perm(peer_sid, if_sid,
4598 SECCLASS_NETIF, NETIF__EGRESS, &ad))
4599 return NF_DROP;
4600
4601 if (sel_netnode_sid(addrp, family, &node_sid))
4602 return NF_DROP;
4603 if (avc_has_perm(peer_sid, node_sid,
4604 SECCLASS_NODE, NODE__SENDTO, &ad))
4605 return NF_DROP;
4606 }
4607
4608 return NF_ACCEPT;
4609 }
4610
4611 static unsigned int selinux_ipv4_postroute(unsigned int hooknum,
4612 struct sk_buff *skb,
4613 const struct net_device *in,
4614 const struct net_device *out,
4615 int (*okfn)(struct sk_buff *))
4616 {
4617 return selinux_ip_postroute(skb, out->ifindex, PF_INET);
4618 }
4619
4620 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4621 static unsigned int selinux_ipv6_postroute(unsigned int hooknum,
4622 struct sk_buff *skb,
4623 const struct net_device *in,
4624 const struct net_device *out,
4625 int (*okfn)(struct sk_buff *))
4626 {
4627 return selinux_ip_postroute(skb, out->ifindex, PF_INET6);
4628 }
4629 #endif /* IPV6 */
4630
4631 #endif /* CONFIG_NETFILTER */
4632
4633 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
4634 {
4635 int err;
4636
4637 err = cap_netlink_send(sk, skb);
4638 if (err)
4639 return err;
4640
4641 return selinux_nlmsg_perm(sk, skb);
4642 }
4643
4644 static int selinux_netlink_recv(struct sk_buff *skb, int capability)
4645 {
4646 int err;
4647 struct common_audit_data ad;
4648
4649 err = cap_netlink_recv(skb, capability);
4650 if (err)
4651 return err;
4652
4653 COMMON_AUDIT_DATA_INIT(&ad, CAP);
4654 ad.u.cap = capability;
4655
4656 return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
4657 SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
4658 }
4659
4660 static int ipc_alloc_security(struct task_struct *task,
4661 struct kern_ipc_perm *perm,
4662 u16 sclass)
4663 {
4664 struct ipc_security_struct *isec;
4665 u32 sid;
4666
4667 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
4668 if (!isec)
4669 return -ENOMEM;
4670
4671 sid = task_sid(task);
4672 isec->sclass = sclass;
4673 isec->sid = sid;
4674 perm->security = isec;
4675
4676 return 0;
4677 }
4678
4679 static void ipc_free_security(struct kern_ipc_perm *perm)
4680 {
4681 struct ipc_security_struct *isec = perm->security;
4682 perm->security = NULL;
4683 kfree(isec);
4684 }
4685
4686 static int msg_msg_alloc_security(struct msg_msg *msg)
4687 {
4688 struct msg_security_struct *msec;
4689
4690 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
4691 if (!msec)
4692 return -ENOMEM;
4693
4694 msec->sid = SECINITSID_UNLABELED;
4695 msg->security = msec;
4696
4697 return 0;
4698 }
4699
4700 static void msg_msg_free_security(struct msg_msg *msg)
4701 {
4702 struct msg_security_struct *msec = msg->security;
4703
4704 msg->security = NULL;
4705 kfree(msec);
4706 }
4707
4708 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
4709 u32 perms)
4710 {
4711 struct ipc_security_struct *isec;
4712 struct common_audit_data ad;
4713 u32 sid = current_sid();
4714
4715 isec = ipc_perms->security;
4716
4717 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4718 ad.u.ipc_id = ipc_perms->key;
4719
4720 return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
4721 }
4722
4723 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
4724 {
4725 return msg_msg_alloc_security(msg);
4726 }
4727
4728 static void selinux_msg_msg_free_security(struct msg_msg *msg)
4729 {
4730 msg_msg_free_security(msg);
4731 }
4732
4733 /* message queue security operations */
4734 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
4735 {
4736 struct ipc_security_struct *isec;
4737 struct common_audit_data ad;
4738 u32 sid = current_sid();
4739 int rc;
4740
4741 rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
4742 if (rc)
4743 return rc;
4744
4745 isec = msq->q_perm.security;
4746
4747 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4748 ad.u.ipc_id = msq->q_perm.key;
4749
4750 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
4751 MSGQ__CREATE, &ad);
4752 if (rc) {
4753 ipc_free_security(&msq->q_perm);
4754 return rc;
4755 }
4756 return 0;
4757 }
4758
4759 static void selinux_msg_queue_free_security(struct msg_queue *msq)
4760 {
4761 ipc_free_security(&msq->q_perm);
4762 }
4763
4764 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
4765 {
4766 struct ipc_security_struct *isec;
4767 struct common_audit_data ad;
4768 u32 sid = current_sid();
4769
4770 isec = msq->q_perm.security;
4771
4772 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4773 ad.u.ipc_id = msq->q_perm.key;
4774
4775 return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
4776 MSGQ__ASSOCIATE, &ad);
4777 }
4778
4779 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
4780 {
4781 int err;
4782 int perms;
4783
4784 switch (cmd) {
4785 case IPC_INFO:
4786 case MSG_INFO:
4787 /* No specific object, just general system-wide information. */
4788 return task_has_system(current, SYSTEM__IPC_INFO);
4789 case IPC_STAT:
4790 case MSG_STAT:
4791 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
4792 break;
4793 case IPC_SET:
4794 perms = MSGQ__SETATTR;
4795 break;
4796 case IPC_RMID:
4797 perms = MSGQ__DESTROY;
4798 break;
4799 default:
4800 return 0;
4801 }
4802
4803 err = ipc_has_perm(&msq->q_perm, perms);
4804 return err;
4805 }
4806
4807 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
4808 {
4809 struct ipc_security_struct *isec;
4810 struct msg_security_struct *msec;
4811 struct common_audit_data ad;
4812 u32 sid = current_sid();
4813 int rc;
4814
4815 isec = msq->q_perm.security;
4816 msec = msg->security;
4817
4818 /*
4819 * First time through, need to assign label to the message
4820 */
4821 if (msec->sid == SECINITSID_UNLABELED) {
4822 /*
4823 * Compute new sid based on current process and
4824 * message queue this message will be stored in
4825 */
4826 rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
4827 &msec->sid);
4828 if (rc)
4829 return rc;
4830 }
4831
4832 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4833 ad.u.ipc_id = msq->q_perm.key;
4834
4835 /* Can this process write to the queue? */
4836 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
4837 MSGQ__WRITE, &ad);
4838 if (!rc)
4839 /* Can this process send the message */
4840 rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG,
4841 MSG__SEND, &ad);
4842 if (!rc)
4843 /* Can the message be put in the queue? */
4844 rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ,
4845 MSGQ__ENQUEUE, &ad);
4846
4847 return rc;
4848 }
4849
4850 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
4851 struct task_struct *target,
4852 long type, int mode)
4853 {
4854 struct ipc_security_struct *isec;
4855 struct msg_security_struct *msec;
4856 struct common_audit_data ad;
4857 u32 sid = task_sid(target);
4858 int rc;
4859
4860 isec = msq->q_perm.security;
4861 msec = msg->security;
4862
4863 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4864 ad.u.ipc_id = msq->q_perm.key;
4865
4866 rc = avc_has_perm(sid, isec->sid,
4867 SECCLASS_MSGQ, MSGQ__READ, &ad);
4868 if (!rc)
4869 rc = avc_has_perm(sid, msec->sid,
4870 SECCLASS_MSG, MSG__RECEIVE, &ad);
4871 return rc;
4872 }
4873
4874 /* Shared Memory security operations */
4875 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
4876 {
4877 struct ipc_security_struct *isec;
4878 struct common_audit_data ad;
4879 u32 sid = current_sid();
4880 int rc;
4881
4882 rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
4883 if (rc)
4884 return rc;
4885
4886 isec = shp->shm_perm.security;
4887
4888 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4889 ad.u.ipc_id = shp->shm_perm.key;
4890
4891 rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM,
4892 SHM__CREATE, &ad);
4893 if (rc) {
4894 ipc_free_security(&shp->shm_perm);
4895 return rc;
4896 }
4897 return 0;
4898 }
4899
4900 static void selinux_shm_free_security(struct shmid_kernel *shp)
4901 {
4902 ipc_free_security(&shp->shm_perm);
4903 }
4904
4905 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
4906 {
4907 struct ipc_security_struct *isec;
4908 struct common_audit_data ad;
4909 u32 sid = current_sid();
4910
4911 isec = shp->shm_perm.security;
4912
4913 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4914 ad.u.ipc_id = shp->shm_perm.key;
4915
4916 return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
4917 SHM__ASSOCIATE, &ad);
4918 }
4919
4920 /* Note, at this point, shp is locked down */
4921 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
4922 {
4923 int perms;
4924 int err;
4925
4926 switch (cmd) {
4927 case IPC_INFO:
4928 case SHM_INFO:
4929 /* No specific object, just general system-wide information. */
4930 return task_has_system(current, SYSTEM__IPC_INFO);
4931 case IPC_STAT:
4932 case SHM_STAT:
4933 perms = SHM__GETATTR | SHM__ASSOCIATE;
4934 break;
4935 case IPC_SET:
4936 perms = SHM__SETATTR;
4937 break;
4938 case SHM_LOCK:
4939 case SHM_UNLOCK:
4940 perms = SHM__LOCK;
4941 break;
4942 case IPC_RMID:
4943 perms = SHM__DESTROY;
4944 break;
4945 default:
4946 return 0;
4947 }
4948
4949 err = ipc_has_perm(&shp->shm_perm, perms);
4950 return err;
4951 }
4952
4953 static int selinux_shm_shmat(struct shmid_kernel *shp,
4954 char __user *shmaddr, int shmflg)
4955 {
4956 u32 perms;
4957
4958 if (shmflg & SHM_RDONLY)
4959 perms = SHM__READ;
4960 else
4961 perms = SHM__READ | SHM__WRITE;
4962
4963 return ipc_has_perm(&shp->shm_perm, perms);
4964 }
4965
4966 /* Semaphore security operations */
4967 static int selinux_sem_alloc_security(struct sem_array *sma)
4968 {
4969 struct ipc_security_struct *isec;
4970 struct common_audit_data ad;
4971 u32 sid = current_sid();
4972 int rc;
4973
4974 rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
4975 if (rc)
4976 return rc;
4977
4978 isec = sma->sem_perm.security;
4979
4980 COMMON_AUDIT_DATA_INIT(&ad, IPC);
4981 ad.u.ipc_id = sma->sem_perm.key;
4982
4983 rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM,
4984 SEM__CREATE, &ad);
4985 if (rc) {
4986 ipc_free_security(&sma->sem_perm);
4987 return rc;
4988 }
4989 return 0;
4990 }
4991
4992 static void selinux_sem_free_security(struct sem_array *sma)
4993 {
4994 ipc_free_security(&sma->sem_perm);
4995 }
4996
4997 static int selinux_sem_associate(struct sem_array *sma, int semflg)
4998 {
4999 struct ipc_security_struct *isec;
5000 struct common_audit_data ad;
5001 u32 sid = current_sid();
5002
5003 isec = sma->sem_perm.security;
5004
5005 COMMON_AUDIT_DATA_INIT(&ad, IPC);
5006 ad.u.ipc_id = sma->sem_perm.key;
5007
5008 return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
5009 SEM__ASSOCIATE, &ad);
5010 }
5011
5012 /* Note, at this point, sma is locked down */
5013 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
5014 {
5015 int err;
5016 u32 perms;
5017
5018 switch (cmd) {
5019 case IPC_INFO:
5020 case SEM_INFO:
5021 /* No specific object, just general system-wide information. */
5022 return task_has_system(current, SYSTEM__IPC_INFO);
5023 case GETPID:
5024 case GETNCNT:
5025 case GETZCNT:
5026 perms = SEM__GETATTR;
5027 break;
5028 case GETVAL:
5029 case GETALL:
5030 perms = SEM__READ;
5031 break;
5032 case SETVAL:
5033 case SETALL:
5034 perms = SEM__WRITE;
5035 break;
5036 case IPC_RMID:
5037 perms = SEM__DESTROY;
5038 break;
5039 case IPC_SET:
5040 perms = SEM__SETATTR;
5041 break;
5042 case IPC_STAT:
5043 case SEM_STAT:
5044 perms = SEM__GETATTR | SEM__ASSOCIATE;
5045 break;
5046 default:
5047 return 0;
5048 }
5049
5050 err = ipc_has_perm(&sma->sem_perm, perms);
5051 return err;
5052 }
5053
5054 static int selinux_sem_semop(struct sem_array *sma,
5055 struct sembuf *sops, unsigned nsops, int alter)
5056 {
5057 u32 perms;
5058
5059 if (alter)
5060 perms = SEM__READ | SEM__WRITE;
5061 else
5062 perms = SEM__READ;
5063
5064 return ipc_has_perm(&sma->sem_perm, perms);
5065 }
5066
5067 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
5068 {
5069 u32 av = 0;
5070
5071 av = 0;
5072 if (flag & S_IRUGO)
5073 av |= IPC__UNIX_READ;
5074 if (flag & S_IWUGO)
5075 av |= IPC__UNIX_WRITE;
5076
5077 if (av == 0)
5078 return 0;
5079
5080 return ipc_has_perm(ipcp, av);
5081 }
5082
5083 static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
5084 {
5085 struct ipc_security_struct *isec = ipcp->security;
5086 *secid = isec->sid;
5087 }
5088
5089 static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
5090 {
5091 if (inode)
5092 inode_doinit_with_dentry(inode, dentry);
5093 }
5094
5095 static int selinux_getprocattr(struct task_struct *p,
5096 char *name, char **value)
5097 {
5098 const struct task_security_struct *__tsec;
5099 u32 sid;
5100 int error;
5101 unsigned len;
5102
5103 if (current != p) {
5104 error = current_has_perm(p, PROCESS__GETATTR);
5105 if (error)
5106 return error;
5107 }
5108
5109 rcu_read_lock();
5110 __tsec = __task_cred(p)->security;
5111
5112 if (!strcmp(name, "current"))
5113 sid = __tsec->sid;
5114 else if (!strcmp(name, "prev"))
5115 sid = __tsec->osid;
5116 else if (!strcmp(name, "exec"))
5117 sid = __tsec->exec_sid;
5118 else if (!strcmp(name, "fscreate"))
5119 sid = __tsec->create_sid;
5120 else if (!strcmp(name, "keycreate"))
5121 sid = __tsec->keycreate_sid;
5122 else if (!strcmp(name, "sockcreate"))
5123 sid = __tsec->sockcreate_sid;
5124 else
5125 goto invalid;
5126 rcu_read_unlock();
5127
5128 if (!sid)
5129 return 0;
5130
5131 error = security_sid_to_context(sid, value, &len);
5132 if (error)
5133 return error;
5134 return len;
5135
5136 invalid:
5137 rcu_read_unlock();
5138 return -EINVAL;
5139 }
5140
5141 static int selinux_setprocattr(struct task_struct *p,
5142 char *name, void *value, size_t size)
5143 {
5144 struct task_security_struct *tsec;
5145 struct task_struct *tracer;
5146 struct cred *new;
5147 u32 sid = 0, ptsid;
5148 int error;
5149 char *str = value;
5150
5151 if (current != p) {
5152 /* SELinux only allows a process to change its own
5153 security attributes. */
5154 return -EACCES;
5155 }
5156
5157 /*
5158 * Basic control over ability to set these attributes at all.
5159 * current == p, but we'll pass them separately in case the
5160 * above restriction is ever removed.
5161 */
5162 if (!strcmp(name, "exec"))
5163 error = current_has_perm(p, PROCESS__SETEXEC);
5164 else if (!strcmp(name, "fscreate"))
5165 error = current_has_perm(p, PROCESS__SETFSCREATE);
5166 else if (!strcmp(name, "keycreate"))
5167 error = current_has_perm(p, PROCESS__SETKEYCREATE);
5168 else if (!strcmp(name, "sockcreate"))
5169 error = current_has_perm(p, PROCESS__SETSOCKCREATE);
5170 else if (!strcmp(name, "current"))
5171 error = current_has_perm(p, PROCESS__SETCURRENT);
5172 else
5173 error = -EINVAL;
5174 if (error)
5175 return error;
5176
5177 /* Obtain a SID for the context, if one was specified. */
5178 if (size && str[1] && str[1] != '\n') {
5179 if (str[size-1] == '\n') {
5180 str[size-1] = 0;
5181 size--;
5182 }
5183 error = security_context_to_sid(value, size, &sid);
5184 if (error == -EINVAL && !strcmp(name, "fscreate")) {
5185 if (!capable(CAP_MAC_ADMIN))
5186 return error;
5187 error = security_context_to_sid_force(value, size,
5188 &sid);
5189 }
5190 if (error)
5191 return error;
5192 }
5193
5194 new = prepare_creds();
5195 if (!new)
5196 return -ENOMEM;
5197
5198 /* Permission checking based on the specified context is
5199 performed during the actual operation (execve,
5200 open/mkdir/...), when we know the full context of the
5201 operation. See selinux_bprm_set_creds for the execve
5202 checks and may_create for the file creation checks. The
5203 operation will then fail if the context is not permitted. */
5204 tsec = new->security;
5205 if (!strcmp(name, "exec")) {
5206 tsec->exec_sid = sid;
5207 } else if (!strcmp(name, "fscreate")) {
5208 tsec->create_sid = sid;
5209 } else if (!strcmp(name, "keycreate")) {
5210 error = may_create_key(sid, p);
5211 if (error)
5212 goto abort_change;
5213 tsec->keycreate_sid = sid;
5214 } else if (!strcmp(name, "sockcreate")) {
5215 tsec->sockcreate_sid = sid;
5216 } else if (!strcmp(name, "current")) {
5217 error = -EINVAL;
5218 if (sid == 0)
5219 goto abort_change;
5220
5221 /* Only allow single threaded processes to change context */
5222 error = -EPERM;
5223 if (!current_is_single_threaded()) {
5224 error = security_bounded_transition(tsec->sid, sid);
5225 if (error)
5226 goto abort_change;
5227 }
5228
5229 /* Check permissions for the transition. */
5230 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
5231 PROCESS__DYNTRANSITION, NULL);
5232 if (error)
5233 goto abort_change;
5234
5235 /* Check for ptracing, and update the task SID if ok.
5236 Otherwise, leave SID unchanged and fail. */
5237 ptsid = 0;
5238 task_lock(p);
5239 tracer = tracehook_tracer_task(p);
5240 if (tracer)
5241 ptsid = task_sid(tracer);
5242 task_unlock(p);
5243
5244 if (tracer) {
5245 error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
5246 PROCESS__PTRACE, NULL);
5247 if (error)
5248 goto abort_change;
5249 }
5250
5251 tsec->sid = sid;
5252 } else {
5253 error = -EINVAL;
5254 goto abort_change;
5255 }
5256
5257 commit_creds(new);
5258 return size;
5259
5260 abort_change:
5261 abort_creds(new);
5262 return error;
5263 }
5264
5265 static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
5266 {
5267 return security_sid_to_context(secid, secdata, seclen);
5268 }
5269
5270 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
5271 {
5272 return security_context_to_sid(secdata, seclen, secid);
5273 }
5274
5275 static void selinux_release_secctx(char *secdata, u32 seclen)
5276 {
5277 kfree(secdata);
5278 }
5279
5280 /*
5281 * called with inode->i_mutex locked
5282 */
5283 static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
5284 {
5285 return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0);
5286 }
5287
5288 /*
5289 * called with inode->i_mutex locked
5290 */
5291 static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
5292 {
5293 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0);
5294 }
5295
5296 static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
5297 {
5298 int len = 0;
5299 len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX,
5300 ctx, true);
5301 if (len < 0)
5302 return len;
5303 *ctxlen = len;
5304 return 0;
5305 }
5306 #ifdef CONFIG_KEYS
5307
5308 static int selinux_key_alloc(struct key *k, const struct cred *cred,
5309 unsigned long flags)
5310 {
5311 const struct task_security_struct *tsec;
5312 struct key_security_struct *ksec;
5313
5314 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
5315 if (!ksec)
5316 return -ENOMEM;
5317
5318 tsec = cred->security;
5319 if (tsec->keycreate_sid)
5320 ksec->sid = tsec->keycreate_sid;
5321 else
5322 ksec->sid = tsec->sid;
5323
5324 k->security = ksec;
5325 return 0;
5326 }
5327
5328 static void selinux_key_free(struct key *k)
5329 {
5330 struct key_security_struct *ksec = k->security;
5331
5332 k->security = NULL;
5333 kfree(ksec);
5334 }
5335
5336 static int selinux_key_permission(key_ref_t key_ref,
5337 const struct cred *cred,
5338 key_perm_t perm)
5339 {
5340 struct key *key;
5341 struct key_security_struct *ksec;
5342 u32 sid;
5343
5344 /* if no specific permissions are requested, we skip the
5345 permission check. No serious, additional covert channels
5346 appear to be created. */
5347 if (perm == 0)
5348 return 0;
5349
5350 sid = cred_sid(cred);
5351
5352 key = key_ref_to_ptr(key_ref);
5353 ksec = key->security;
5354
5355 return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL);
5356 }
5357
5358 static int selinux_key_getsecurity(struct key *key, char **_buffer)
5359 {
5360 struct key_security_struct *ksec = key->security;
5361 char *context = NULL;
5362 unsigned len;
5363 int rc;
5364
5365 rc = security_sid_to_context(ksec->sid, &context, &len);
5366 if (!rc)
5367 rc = len;
5368 *_buffer = context;
5369 return rc;
5370 }
5371
5372 #endif
5373
5374 static struct security_operations selinux_ops = {
5375 .name = "selinux",
5376
5377 .ptrace_access_check = selinux_ptrace_access_check,
5378 .ptrace_traceme = selinux_ptrace_traceme,
5379 .capget = selinux_capget,
5380 .capset = selinux_capset,
5381 .sysctl = selinux_sysctl,
5382 .capable = selinux_capable,
5383 .quotactl = selinux_quotactl,
5384 .quota_on = selinux_quota_on,
5385 .syslog = selinux_syslog,
5386 .vm_enough_memory = selinux_vm_enough_memory,
5387
5388 .netlink_send = selinux_netlink_send,
5389 .netlink_recv = selinux_netlink_recv,
5390
5391 .bprm_set_creds = selinux_bprm_set_creds,
5392 .bprm_committing_creds = selinux_bprm_committing_creds,
5393 .bprm_committed_creds = selinux_bprm_committed_creds,
5394 .bprm_secureexec = selinux_bprm_secureexec,
5395
5396 .sb_alloc_security = selinux_sb_alloc_security,
5397 .sb_free_security = selinux_sb_free_security,
5398 .sb_copy_data = selinux_sb_copy_data,
5399 .sb_kern_mount = selinux_sb_kern_mount,
5400 .sb_show_options = selinux_sb_show_options,
5401 .sb_statfs = selinux_sb_statfs,
5402 .sb_mount = selinux_mount,
5403 .sb_umount = selinux_umount,
5404 .sb_set_mnt_opts = selinux_set_mnt_opts,
5405 .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
5406 .sb_parse_opts_str = selinux_parse_opts_str,
5407
5408
5409 .inode_alloc_security = selinux_inode_alloc_security,
5410 .inode_free_security = selinux_inode_free_security,
5411 .inode_init_security = selinux_inode_init_security,
5412 .inode_create = selinux_inode_create,
5413 .inode_link = selinux_inode_link,
5414 .inode_unlink = selinux_inode_unlink,
5415 .inode_symlink = selinux_inode_symlink,
5416 .inode_mkdir = selinux_inode_mkdir,
5417 .inode_rmdir = selinux_inode_rmdir,
5418 .inode_mknod = selinux_inode_mknod,
5419 .inode_rename = selinux_inode_rename,
5420 .inode_readlink = selinux_inode_readlink,
5421 .inode_follow_link = selinux_inode_follow_link,
5422 .inode_permission = selinux_inode_permission,
5423 .inode_setattr = selinux_inode_setattr,
5424 .inode_getattr = selinux_inode_getattr,
5425 .inode_setxattr = selinux_inode_setxattr,
5426 .inode_post_setxattr = selinux_inode_post_setxattr,
5427 .inode_getxattr = selinux_inode_getxattr,
5428 .inode_listxattr = selinux_inode_listxattr,
5429 .inode_removexattr = selinux_inode_removexattr,
5430 .inode_getsecurity = selinux_inode_getsecurity,
5431 .inode_setsecurity = selinux_inode_setsecurity,
5432 .inode_listsecurity = selinux_inode_listsecurity,
5433 .inode_getsecid = selinux_inode_getsecid,
5434
5435 .file_permission = selinux_file_permission,
5436 .file_alloc_security = selinux_file_alloc_security,
5437 .file_free_security = selinux_file_free_security,
5438 .file_ioctl = selinux_file_ioctl,
5439 .file_mmap = selinux_file_mmap,
5440 .file_mprotect = selinux_file_mprotect,
5441 .file_lock = selinux_file_lock,
5442 .file_fcntl = selinux_file_fcntl,
5443 .file_set_fowner = selinux_file_set_fowner,
5444 .file_send_sigiotask = selinux_file_send_sigiotask,
5445 .file_receive = selinux_file_receive,
5446
5447 .dentry_open = selinux_dentry_open,
5448
5449 .task_create = selinux_task_create,
5450 .cred_alloc_blank = selinux_cred_alloc_blank,
5451 .cred_free = selinux_cred_free,
5452 .cred_prepare = selinux_cred_prepare,
5453 .cred_transfer = selinux_cred_transfer,
5454 .kernel_act_as = selinux_kernel_act_as,
5455 .kernel_create_files_as = selinux_kernel_create_files_as,
5456 .kernel_module_request = selinux_kernel_module_request,
5457 .task_setpgid = selinux_task_setpgid,
5458 .task_getpgid = selinux_task_getpgid,
5459 .task_getsid = selinux_task_getsid,
5460 .task_getsecid = selinux_task_getsecid,
5461 .task_setnice = selinux_task_setnice,
5462 .task_setioprio = selinux_task_setioprio,
5463 .task_getioprio = selinux_task_getioprio,
5464 .task_setrlimit = selinux_task_setrlimit,
5465 .task_setscheduler = selinux_task_setscheduler,
5466 .task_getscheduler = selinux_task_getscheduler,
5467 .task_movememory = selinux_task_movememory,
5468 .task_kill = selinux_task_kill,
5469 .task_wait = selinux_task_wait,
5470 .task_to_inode = selinux_task_to_inode,
5471
5472 .ipc_permission = selinux_ipc_permission,
5473 .ipc_getsecid = selinux_ipc_getsecid,
5474
5475 .msg_msg_alloc_security = selinux_msg_msg_alloc_security,
5476 .msg_msg_free_security = selinux_msg_msg_free_security,
5477
5478 .msg_queue_alloc_security = selinux_msg_queue_alloc_security,
5479 .msg_queue_free_security = selinux_msg_queue_free_security,
5480 .msg_queue_associate = selinux_msg_queue_associate,
5481 .msg_queue_msgctl = selinux_msg_queue_msgctl,
5482 .msg_queue_msgsnd = selinux_msg_queue_msgsnd,
5483 .msg_queue_msgrcv = selinux_msg_queue_msgrcv,
5484
5485 .shm_alloc_security = selinux_shm_alloc_security,
5486 .shm_free_security = selinux_shm_free_security,
5487 .shm_associate = selinux_shm_associate,
5488 .shm_shmctl = selinux_shm_shmctl,
5489 .shm_shmat = selinux_shm_shmat,
5490
5491 .sem_alloc_security = selinux_sem_alloc_security,
5492 .sem_free_security = selinux_sem_free_security,
5493 .sem_associate = selinux_sem_associate,
5494 .sem_semctl = selinux_sem_semctl,
5495 .sem_semop = selinux_sem_semop,
5496
5497 .d_instantiate = selinux_d_instantiate,
5498
5499 .getprocattr = selinux_getprocattr,
5500 .setprocattr = selinux_setprocattr,
5501
5502 .secid_to_secctx = selinux_secid_to_secctx,
5503 .secctx_to_secid = selinux_secctx_to_secid,
5504 .release_secctx = selinux_release_secctx,
5505 .inode_notifysecctx = selinux_inode_notifysecctx,
5506 .inode_setsecctx = selinux_inode_setsecctx,
5507 .inode_getsecctx = selinux_inode_getsecctx,
5508
5509 .unix_stream_connect = selinux_socket_unix_stream_connect,
5510 .unix_may_send = selinux_socket_unix_may_send,
5511
5512 .socket_create = selinux_socket_create,
5513 .socket_post_create = selinux_socket_post_create,
5514 .socket_bind = selinux_socket_bind,
5515 .socket_connect = selinux_socket_connect,
5516 .socket_listen = selinux_socket_listen,
5517 .socket_accept = selinux_socket_accept,
5518 .socket_sendmsg = selinux_socket_sendmsg,
5519 .socket_recvmsg = selinux_socket_recvmsg,
5520 .socket_getsockname = selinux_socket_getsockname,
5521 .socket_getpeername = selinux_socket_getpeername,
5522 .socket_getsockopt = selinux_socket_getsockopt,
5523 .socket_setsockopt = selinux_socket_setsockopt,
5524 .socket_shutdown = selinux_socket_shutdown,
5525 .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb,
5526 .socket_getpeersec_stream = selinux_socket_getpeersec_stream,
5527 .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram,
5528 .sk_alloc_security = selinux_sk_alloc_security,
5529 .sk_free_security = selinux_sk_free_security,
5530 .sk_clone_security = selinux_sk_clone_security,
5531 .sk_getsecid = selinux_sk_getsecid,
5532 .sock_graft = selinux_sock_graft,
5533 .inet_conn_request = selinux_inet_conn_request,
5534 .inet_csk_clone = selinux_inet_csk_clone,
5535 .inet_conn_established = selinux_inet_conn_established,
5536 .req_classify_flow = selinux_req_classify_flow,
5537 .tun_dev_create = selinux_tun_dev_create,
5538 .tun_dev_post_create = selinux_tun_dev_post_create,
5539 .tun_dev_attach = selinux_tun_dev_attach,
5540
5541 #ifdef CONFIG_SECURITY_NETWORK_XFRM
5542 .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
5543 .xfrm_policy_clone_security = selinux_xfrm_policy_clone,
5544 .xfrm_policy_free_security = selinux_xfrm_policy_free,
5545 .xfrm_policy_delete_security = selinux_xfrm_policy_delete,
5546 .xfrm_state_alloc_security = selinux_xfrm_state_alloc,
5547 .xfrm_state_free_security = selinux_xfrm_state_free,
5548 .xfrm_state_delete_security = selinux_xfrm_state_delete,
5549 .xfrm_policy_lookup = selinux_xfrm_policy_lookup,
5550 .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match,
5551 .xfrm_decode_session = selinux_xfrm_decode_session,
5552 #endif
5553
5554 #ifdef CONFIG_KEYS
5555 .key_alloc = selinux_key_alloc,
5556 .key_free = selinux_key_free,
5557 .key_permission = selinux_key_permission,
5558 .key_getsecurity = selinux_key_getsecurity,
5559 #endif
5560
5561 #ifdef CONFIG_AUDIT
5562 .audit_rule_init = selinux_audit_rule_init,
5563 .audit_rule_known = selinux_audit_rule_known,
5564 .audit_rule_match = selinux_audit_rule_match,
5565 .audit_rule_free = selinux_audit_rule_free,
5566 #endif
5567 };
5568
5569 static __init int selinux_init(void)
5570 {
5571 if (!security_module_enable(&selinux_ops)) {
5572 selinux_enabled = 0;
5573 return 0;
5574 }
5575
5576 if (!selinux_enabled) {
5577 printk(KERN_INFO "SELinux: Disabled at boot.\n");
5578 return 0;
5579 }
5580
5581 printk(KERN_INFO "SELinux: Initializing.\n");
5582
5583 /* Set the security state for the initial task. */
5584 cred_init_security();
5585
5586 default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
5587
5588 sel_inode_cache = kmem_cache_create("selinux_inode_security",
5589 sizeof(struct inode_security_struct),
5590 0, SLAB_PANIC, NULL);
5591 avc_init();
5592
5593 if (register_security(&selinux_ops))
5594 panic("SELinux: Unable to register with kernel.\n");
5595
5596 if (selinux_enforcing)
5597 printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n");
5598 else
5599 printk(KERN_DEBUG "SELinux: Starting in permissive mode\n");
5600
5601 return 0;
5602 }
5603
5604 static void delayed_superblock_init(struct super_block *sb, void *unused)
5605 {
5606 superblock_doinit(sb, NULL);
5607 }
5608
5609 void selinux_complete_init(void)
5610 {
5611 printk(KERN_DEBUG "SELinux: Completing initialization.\n");
5612
5613 /* Set up any superblocks initialized prior to the policy load. */
5614 printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n");
5615 iterate_supers(delayed_superblock_init, NULL);
5616 }
5617
5618 /* SELinux requires early initialization in order to label
5619 all processes and objects when they are created. */
5620 security_initcall(selinux_init);
5621
5622 #if defined(CONFIG_NETFILTER)
5623
5624 static struct nf_hook_ops selinux_ipv4_ops[] = {
5625 {
5626 .hook = selinux_ipv4_postroute,
5627 .owner = THIS_MODULE,
5628 .pf = PF_INET,
5629 .hooknum = NF_INET_POST_ROUTING,
5630 .priority = NF_IP_PRI_SELINUX_LAST,
5631 },
5632 {
5633 .hook = selinux_ipv4_forward,
5634 .owner = THIS_MODULE,
5635 .pf = PF_INET,
5636 .hooknum = NF_INET_FORWARD,
5637 .priority = NF_IP_PRI_SELINUX_FIRST,
5638 },
5639 {
5640 .hook = selinux_ipv4_output,
5641 .owner = THIS_MODULE,
5642 .pf = PF_INET,
5643 .hooknum = NF_INET_LOCAL_OUT,
5644 .priority = NF_IP_PRI_SELINUX_FIRST,
5645 }
5646 };
5647
5648 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5649
5650 static struct nf_hook_ops selinux_ipv6_ops[] = {
5651 {
5652 .hook = selinux_ipv6_postroute,
5653 .owner = THIS_MODULE,
5654 .pf = PF_INET6,
5655 .hooknum = NF_INET_POST_ROUTING,
5656 .priority = NF_IP6_PRI_SELINUX_LAST,
5657 },
5658 {
5659 .hook = selinux_ipv6_forward,
5660 .owner = THIS_MODULE,
5661 .pf = PF_INET6,
5662 .hooknum = NF_INET_FORWARD,
5663 .priority = NF_IP6_PRI_SELINUX_FIRST,
5664 }
5665 };
5666
5667 #endif /* IPV6 */
5668
5669 static int __init selinux_nf_ip_init(void)
5670 {
5671 int err = 0;
5672
5673 if (!selinux_enabled)
5674 goto out;
5675
5676 printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n");
5677
5678 err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5679 if (err)
5680 panic("SELinux: nf_register_hooks for IPv4: error %d\n", err);
5681
5682 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5683 err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5684 if (err)
5685 panic("SELinux: nf_register_hooks for IPv6: error %d\n", err);
5686 #endif /* IPV6 */
5687
5688 out:
5689 return err;
5690 }
5691
5692 __initcall(selinux_nf_ip_init);
5693
5694 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
5695 static void selinux_nf_ip_exit(void)
5696 {
5697 printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n");
5698
5699 nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5700 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5701 nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5702 #endif /* IPV6 */
5703 }
5704 #endif
5705
5706 #else /* CONFIG_NETFILTER */
5707
5708 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
5709 #define selinux_nf_ip_exit()
5710 #endif
5711
5712 #endif /* CONFIG_NETFILTER */
5713
5714 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
5715 static int selinux_disabled;
5716
5717 int selinux_disable(void)
5718 {
5719 extern void exit_sel_fs(void);
5720
5721 if (ss_initialized) {
5722 /* Not permitted after initial policy load. */
5723 return -EINVAL;
5724 }
5725
5726 if (selinux_disabled) {
5727 /* Only do this once. */
5728 return -EINVAL;
5729 }
5730
5731 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
5732
5733 selinux_disabled = 1;
5734 selinux_enabled = 0;
5735
5736 reset_security_ops();
5737
5738 /* Try to destroy the avc node cache */
5739 avc_disable();
5740
5741 /* Unregister netfilter hooks. */
5742 selinux_nf_ip_exit();
5743
5744 /* Unregister selinuxfs. */
5745 exit_sel_fs();
5746
5747 return 0;
5748 }
5749 #endif
AMDTP streaming driver for the Linux FireWire stack (Juju)