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Merge branch 'msm-next' of git://people.freedesktop.org/~robclark/linux into drm...
[deliverable/linux.git] / security / selinux / selinuxfs.c
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul@paul-moore.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
33
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37 #include "flask.h"
38 #include "avc.h"
39 #include "avc_ss.h"
40 #include "security.h"
41 #include "objsec.h"
42 #include "conditional.h"
43
44 /* Policy capability filenames */
45 static char *policycap_names[] = {
46 "network_peer_controls",
47 "open_perms",
48 "redhat1",
49 "always_check_network"
50 };
51
52 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
53
54 static int __init checkreqprot_setup(char *str)
55 {
56 unsigned long checkreqprot;
57 if (!strict_strtoul(str, 0, &checkreqprot))
58 selinux_checkreqprot = checkreqprot ? 1 : 0;
59 return 1;
60 }
61 __setup("checkreqprot=", checkreqprot_setup);
62
63 static DEFINE_MUTEX(sel_mutex);
64
65 /* global data for booleans */
66 static struct dentry *bool_dir;
67 static int bool_num;
68 static char **bool_pending_names;
69 static int *bool_pending_values;
70
71 /* global data for classes */
72 static struct dentry *class_dir;
73 static unsigned long last_class_ino;
74
75 static char policy_opened;
76
77 /* global data for policy capabilities */
78 static struct dentry *policycap_dir;
79
80 /* Check whether a task is allowed to use a security operation. */
81 static int task_has_security(struct task_struct *tsk,
82 u32 perms)
83 {
84 const struct task_security_struct *tsec;
85 u32 sid = 0;
86
87 rcu_read_lock();
88 tsec = __task_cred(tsk)->security;
89 if (tsec)
90 sid = tsec->sid;
91 rcu_read_unlock();
92 if (!tsec)
93 return -EACCES;
94
95 return avc_has_perm(sid, SECINITSID_SECURITY,
96 SECCLASS_SECURITY, perms, NULL);
97 }
98
99 enum sel_inos {
100 SEL_ROOT_INO = 2,
101 SEL_LOAD, /* load policy */
102 SEL_ENFORCE, /* get or set enforcing status */
103 SEL_CONTEXT, /* validate context */
104 SEL_ACCESS, /* compute access decision */
105 SEL_CREATE, /* compute create labeling decision */
106 SEL_RELABEL, /* compute relabeling decision */
107 SEL_USER, /* compute reachable user contexts */
108 SEL_POLICYVERS, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS, /* commit new boolean values */
110 SEL_MLS, /* return if MLS policy is enabled */
111 SEL_DISABLE, /* disable SELinux until next reboot */
112 SEL_MEMBER, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
114 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
115 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
117 SEL_STATUS, /* export current status using mmap() */
118 SEL_POLICY, /* allow userspace to read the in kernel policy */
119 SEL_INO_NEXT, /* The next inode number to use */
120 };
121
122 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
123
124 #define SEL_INITCON_INO_OFFSET 0x01000000
125 #define SEL_BOOL_INO_OFFSET 0x02000000
126 #define SEL_CLASS_INO_OFFSET 0x04000000
127 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
128 #define SEL_INO_MASK 0x00ffffff
129
130 #define TMPBUFLEN 12
131 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
132 size_t count, loff_t *ppos)
133 {
134 char tmpbuf[TMPBUFLEN];
135 ssize_t length;
136
137 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
138 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
139 }
140
141 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
142 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
143 size_t count, loff_t *ppos)
144
145 {
146 char *page = NULL;
147 ssize_t length;
148 int new_value;
149
150 length = -ENOMEM;
151 if (count >= PAGE_SIZE)
152 goto out;
153
154 /* No partial writes. */
155 length = EINVAL;
156 if (*ppos != 0)
157 goto out;
158
159 length = -ENOMEM;
160 page = (char *)get_zeroed_page(GFP_KERNEL);
161 if (!page)
162 goto out;
163
164 length = -EFAULT;
165 if (copy_from_user(page, buf, count))
166 goto out;
167
168 length = -EINVAL;
169 if (sscanf(page, "%d", &new_value) != 1)
170 goto out;
171
172 if (new_value != selinux_enforcing) {
173 length = task_has_security(current, SECURITY__SETENFORCE);
174 if (length)
175 goto out;
176 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
177 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
178 new_value, selinux_enforcing,
179 from_kuid(&init_user_ns, audit_get_loginuid(current)),
180 audit_get_sessionid(current));
181 selinux_enforcing = new_value;
182 if (selinux_enforcing)
183 avc_ss_reset(0);
184 selnl_notify_setenforce(selinux_enforcing);
185 selinux_status_update_setenforce(selinux_enforcing);
186 }
187 length = count;
188 out:
189 free_page((unsigned long) page);
190 return length;
191 }
192 #else
193 #define sel_write_enforce NULL
194 #endif
195
196 static const struct file_operations sel_enforce_ops = {
197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
199 .llseek = generic_file_llseek,
200 };
201
202 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
203 size_t count, loff_t *ppos)
204 {
205 char tmpbuf[TMPBUFLEN];
206 ssize_t length;
207 ino_t ino = file_inode(filp)->i_ino;
208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
209 security_get_reject_unknown() : !security_get_allow_unknown();
210
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213 }
214
215 static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 .llseek = generic_file_llseek,
218 };
219
220 static int sel_open_handle_status(struct inode *inode, struct file *filp)
221 {
222 struct page *status = selinux_kernel_status_page();
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230 }
231
232 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234 {
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242 }
243
244 static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246 {
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264 }
265
266 static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271 };
272
273 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
274 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277 {
278 char *page = NULL;
279 ssize_t length;
280 int new_value;
281
282 length = -ENOMEM;
283 if (count >= PAGE_SIZE)
284 goto out;
285
286 /* No partial writes. */
287 length = -EINVAL;
288 if (*ppos != 0)
289 goto out;
290
291 length = -ENOMEM;
292 page = (char *)get_zeroed_page(GFP_KERNEL);
293 if (!page)
294 goto out;
295
296 length = -EFAULT;
297 if (copy_from_user(page, buf, count))
298 goto out;
299
300 length = -EINVAL;
301 if (sscanf(page, "%d", &new_value) != 1)
302 goto out;
303
304 if (new_value) {
305 length = selinux_disable();
306 if (length)
307 goto out;
308 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
309 "selinux=0 auid=%u ses=%u",
310 from_kuid(&init_user_ns, audit_get_loginuid(current)),
311 audit_get_sessionid(current));
312 }
313
314 length = count;
315 out:
316 free_page((unsigned long) page);
317 return length;
318 }
319 #else
320 #define sel_write_disable NULL
321 #endif
322
323 static const struct file_operations sel_disable_ops = {
324 .write = sel_write_disable,
325 .llseek = generic_file_llseek,
326 };
327
328 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
329 size_t count, loff_t *ppos)
330 {
331 char tmpbuf[TMPBUFLEN];
332 ssize_t length;
333
334 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
335 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
336 }
337
338 static const struct file_operations sel_policyvers_ops = {
339 .read = sel_read_policyvers,
340 .llseek = generic_file_llseek,
341 };
342
343 /* declaration for sel_write_load */
344 static int sel_make_bools(void);
345 static int sel_make_classes(void);
346 static int sel_make_policycap(void);
347
348 /* declaration for sel_make_class_dirs */
349 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
350 unsigned long *ino);
351
352 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
353 size_t count, loff_t *ppos)
354 {
355 char tmpbuf[TMPBUFLEN];
356 ssize_t length;
357
358 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
359 security_mls_enabled());
360 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
361 }
362
363 static const struct file_operations sel_mls_ops = {
364 .read = sel_read_mls,
365 .llseek = generic_file_llseek,
366 };
367
368 struct policy_load_memory {
369 size_t len;
370 void *data;
371 };
372
373 static int sel_open_policy(struct inode *inode, struct file *filp)
374 {
375 struct policy_load_memory *plm = NULL;
376 int rc;
377
378 BUG_ON(filp->private_data);
379
380 mutex_lock(&sel_mutex);
381
382 rc = task_has_security(current, SECURITY__READ_POLICY);
383 if (rc)
384 goto err;
385
386 rc = -EBUSY;
387 if (policy_opened)
388 goto err;
389
390 rc = -ENOMEM;
391 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
392 if (!plm)
393 goto err;
394
395 if (i_size_read(inode) != security_policydb_len()) {
396 mutex_lock(&inode->i_mutex);
397 i_size_write(inode, security_policydb_len());
398 mutex_unlock(&inode->i_mutex);
399 }
400
401 rc = security_read_policy(&plm->data, &plm->len);
402 if (rc)
403 goto err;
404
405 policy_opened = 1;
406
407 filp->private_data = plm;
408
409 mutex_unlock(&sel_mutex);
410
411 return 0;
412 err:
413 mutex_unlock(&sel_mutex);
414
415 if (plm)
416 vfree(plm->data);
417 kfree(plm);
418 return rc;
419 }
420
421 static int sel_release_policy(struct inode *inode, struct file *filp)
422 {
423 struct policy_load_memory *plm = filp->private_data;
424
425 BUG_ON(!plm);
426
427 policy_opened = 0;
428
429 vfree(plm->data);
430 kfree(plm);
431
432 return 0;
433 }
434
435 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
436 size_t count, loff_t *ppos)
437 {
438 struct policy_load_memory *plm = filp->private_data;
439 int ret;
440
441 mutex_lock(&sel_mutex);
442
443 ret = task_has_security(current, SECURITY__READ_POLICY);
444 if (ret)
445 goto out;
446
447 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
448 out:
449 mutex_unlock(&sel_mutex);
450 return ret;
451 }
452
453 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
454 struct vm_fault *vmf)
455 {
456 struct policy_load_memory *plm = vma->vm_file->private_data;
457 unsigned long offset;
458 struct page *page;
459
460 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
461 return VM_FAULT_SIGBUS;
462
463 offset = vmf->pgoff << PAGE_SHIFT;
464 if (offset >= roundup(plm->len, PAGE_SIZE))
465 return VM_FAULT_SIGBUS;
466
467 page = vmalloc_to_page(plm->data + offset);
468 get_page(page);
469
470 vmf->page = page;
471
472 return 0;
473 }
474
475 static struct vm_operations_struct sel_mmap_policy_ops = {
476 .fault = sel_mmap_policy_fault,
477 .page_mkwrite = sel_mmap_policy_fault,
478 };
479
480 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
481 {
482 if (vma->vm_flags & VM_SHARED) {
483 /* do not allow mprotect to make mapping writable */
484 vma->vm_flags &= ~VM_MAYWRITE;
485
486 if (vma->vm_flags & VM_WRITE)
487 return -EACCES;
488 }
489
490 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
491 vma->vm_ops = &sel_mmap_policy_ops;
492
493 return 0;
494 }
495
496 static const struct file_operations sel_policy_ops = {
497 .open = sel_open_policy,
498 .read = sel_read_policy,
499 .mmap = sel_mmap_policy,
500 .release = sel_release_policy,
501 .llseek = generic_file_llseek,
502 };
503
504 static ssize_t sel_write_load(struct file *file, const char __user *buf,
505 size_t count, loff_t *ppos)
506
507 {
508 ssize_t length;
509 void *data = NULL;
510
511 mutex_lock(&sel_mutex);
512
513 length = task_has_security(current, SECURITY__LOAD_POLICY);
514 if (length)
515 goto out;
516
517 /* No partial writes. */
518 length = -EINVAL;
519 if (*ppos != 0)
520 goto out;
521
522 length = -EFBIG;
523 if (count > 64 * 1024 * 1024)
524 goto out;
525
526 length = -ENOMEM;
527 data = vmalloc(count);
528 if (!data)
529 goto out;
530
531 length = -EFAULT;
532 if (copy_from_user(data, buf, count) != 0)
533 goto out;
534
535 length = security_load_policy(data, count);
536 if (length)
537 goto out;
538
539 length = sel_make_bools();
540 if (length)
541 goto out1;
542
543 length = sel_make_classes();
544 if (length)
545 goto out1;
546
547 length = sel_make_policycap();
548 if (length)
549 goto out1;
550
551 length = count;
552
553 out1:
554 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
555 "policy loaded auid=%u ses=%u",
556 from_kuid(&init_user_ns, audit_get_loginuid(current)),
557 audit_get_sessionid(current));
558 out:
559 mutex_unlock(&sel_mutex);
560 vfree(data);
561 return length;
562 }
563
564 static const struct file_operations sel_load_ops = {
565 .write = sel_write_load,
566 .llseek = generic_file_llseek,
567 };
568
569 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
570 {
571 char *canon = NULL;
572 u32 sid, len;
573 ssize_t length;
574
575 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
576 if (length)
577 goto out;
578
579 length = security_context_to_sid(buf, size, &sid);
580 if (length)
581 goto out;
582
583 length = security_sid_to_context(sid, &canon, &len);
584 if (length)
585 goto out;
586
587 length = -ERANGE;
588 if (len > SIMPLE_TRANSACTION_LIMIT) {
589 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
590 "payload max\n", __func__, len);
591 goto out;
592 }
593
594 memcpy(buf, canon, len);
595 length = len;
596 out:
597 kfree(canon);
598 return length;
599 }
600
601 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
602 size_t count, loff_t *ppos)
603 {
604 char tmpbuf[TMPBUFLEN];
605 ssize_t length;
606
607 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
608 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
609 }
610
611 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
612 size_t count, loff_t *ppos)
613 {
614 char *page = NULL;
615 ssize_t length;
616 unsigned int new_value;
617
618 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
619 if (length)
620 goto out;
621
622 length = -ENOMEM;
623 if (count >= PAGE_SIZE)
624 goto out;
625
626 /* No partial writes. */
627 length = -EINVAL;
628 if (*ppos != 0)
629 goto out;
630
631 length = -ENOMEM;
632 page = (char *)get_zeroed_page(GFP_KERNEL);
633 if (!page)
634 goto out;
635
636 length = -EFAULT;
637 if (copy_from_user(page, buf, count))
638 goto out;
639
640 length = -EINVAL;
641 if (sscanf(page, "%u", &new_value) != 1)
642 goto out;
643
644 selinux_checkreqprot = new_value ? 1 : 0;
645 length = count;
646 out:
647 free_page((unsigned long) page);
648 return length;
649 }
650 static const struct file_operations sel_checkreqprot_ops = {
651 .read = sel_read_checkreqprot,
652 .write = sel_write_checkreqprot,
653 .llseek = generic_file_llseek,
654 };
655
656 /*
657 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
658 */
659 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
662 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
663 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
664
665 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
666 [SEL_ACCESS] = sel_write_access,
667 [SEL_CREATE] = sel_write_create,
668 [SEL_RELABEL] = sel_write_relabel,
669 [SEL_USER] = sel_write_user,
670 [SEL_MEMBER] = sel_write_member,
671 [SEL_CONTEXT] = sel_write_context,
672 };
673
674 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
675 {
676 ino_t ino = file_inode(file)->i_ino;
677 char *data;
678 ssize_t rv;
679
680 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
681 return -EINVAL;
682
683 data = simple_transaction_get(file, buf, size);
684 if (IS_ERR(data))
685 return PTR_ERR(data);
686
687 rv = write_op[ino](file, data, size);
688 if (rv > 0) {
689 simple_transaction_set(file, rv);
690 rv = size;
691 }
692 return rv;
693 }
694
695 static const struct file_operations transaction_ops = {
696 .write = selinux_transaction_write,
697 .read = simple_transaction_read,
698 .release = simple_transaction_release,
699 .llseek = generic_file_llseek,
700 };
701
702 /*
703 * payload - write methods
704 * If the method has a response, the response should be put in buf,
705 * and the length returned. Otherwise return 0 or and -error.
706 */
707
708 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
709 {
710 char *scon = NULL, *tcon = NULL;
711 u32 ssid, tsid;
712 u16 tclass;
713 struct av_decision avd;
714 ssize_t length;
715
716 length = task_has_security(current, SECURITY__COMPUTE_AV);
717 if (length)
718 goto out;
719
720 length = -ENOMEM;
721 scon = kzalloc(size + 1, GFP_KERNEL);
722 if (!scon)
723 goto out;
724
725 length = -ENOMEM;
726 tcon = kzalloc(size + 1, GFP_KERNEL);
727 if (!tcon)
728 goto out;
729
730 length = -EINVAL;
731 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
732 goto out;
733
734 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
735 if (length)
736 goto out;
737
738 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
739 if (length)
740 goto out;
741
742 security_compute_av_user(ssid, tsid, tclass, &avd);
743
744 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
745 "%x %x %x %x %u %x",
746 avd.allowed, 0xffffffff,
747 avd.auditallow, avd.auditdeny,
748 avd.seqno, avd.flags);
749 out:
750 kfree(tcon);
751 kfree(scon);
752 return length;
753 }
754
755 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
756 {
757 char *scon = NULL, *tcon = NULL;
758 char *namebuf = NULL, *objname = NULL;
759 u32 ssid, tsid, newsid;
760 u16 tclass;
761 ssize_t length;
762 char *newcon = NULL;
763 u32 len;
764 int nargs;
765
766 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
767 if (length)
768 goto out;
769
770 length = -ENOMEM;
771 scon = kzalloc(size + 1, GFP_KERNEL);
772 if (!scon)
773 goto out;
774
775 length = -ENOMEM;
776 tcon = kzalloc(size + 1, GFP_KERNEL);
777 if (!tcon)
778 goto out;
779
780 length = -ENOMEM;
781 namebuf = kzalloc(size + 1, GFP_KERNEL);
782 if (!namebuf)
783 goto out;
784
785 length = -EINVAL;
786 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
787 if (nargs < 3 || nargs > 4)
788 goto out;
789 if (nargs == 4) {
790 /*
791 * If and when the name of new object to be queried contains
792 * either whitespace or multibyte characters, they shall be
793 * encoded based on the percentage-encoding rule.
794 * If not encoded, the sscanf logic picks up only left-half
795 * of the supplied name; splitted by a whitespace unexpectedly.
796 */
797 char *r, *w;
798 int c1, c2;
799
800 r = w = namebuf;
801 do {
802 c1 = *r++;
803 if (c1 == '+')
804 c1 = ' ';
805 else if (c1 == '%') {
806 c1 = hex_to_bin(*r++);
807 if (c1 < 0)
808 goto out;
809 c2 = hex_to_bin(*r++);
810 if (c2 < 0)
811 goto out;
812 c1 = (c1 << 4) | c2;
813 }
814 *w++ = c1;
815 } while (c1 != '\0');
816
817 objname = namebuf;
818 }
819
820 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
821 if (length)
822 goto out;
823
824 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
825 if (length)
826 goto out;
827
828 length = security_transition_sid_user(ssid, tsid, tclass,
829 objname, &newsid);
830 if (length)
831 goto out;
832
833 length = security_sid_to_context(newsid, &newcon, &len);
834 if (length)
835 goto out;
836
837 length = -ERANGE;
838 if (len > SIMPLE_TRANSACTION_LIMIT) {
839 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
840 "payload max\n", __func__, len);
841 goto out;
842 }
843
844 memcpy(buf, newcon, len);
845 length = len;
846 out:
847 kfree(newcon);
848 kfree(namebuf);
849 kfree(tcon);
850 kfree(scon);
851 return length;
852 }
853
854 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
855 {
856 char *scon = NULL, *tcon = NULL;
857 u32 ssid, tsid, newsid;
858 u16 tclass;
859 ssize_t length;
860 char *newcon = NULL;
861 u32 len;
862
863 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
864 if (length)
865 goto out;
866
867 length = -ENOMEM;
868 scon = kzalloc(size + 1, GFP_KERNEL);
869 if (!scon)
870 goto out;
871
872 length = -ENOMEM;
873 tcon = kzalloc(size + 1, GFP_KERNEL);
874 if (!tcon)
875 goto out;
876
877 length = -EINVAL;
878 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
879 goto out;
880
881 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
882 if (length)
883 goto out;
884
885 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
886 if (length)
887 goto out;
888
889 length = security_change_sid(ssid, tsid, tclass, &newsid);
890 if (length)
891 goto out;
892
893 length = security_sid_to_context(newsid, &newcon, &len);
894 if (length)
895 goto out;
896
897 length = -ERANGE;
898 if (len > SIMPLE_TRANSACTION_LIMIT)
899 goto out;
900
901 memcpy(buf, newcon, len);
902 length = len;
903 out:
904 kfree(newcon);
905 kfree(tcon);
906 kfree(scon);
907 return length;
908 }
909
910 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
911 {
912 char *con = NULL, *user = NULL, *ptr;
913 u32 sid, *sids = NULL;
914 ssize_t length;
915 char *newcon;
916 int i, rc;
917 u32 len, nsids;
918
919 length = task_has_security(current, SECURITY__COMPUTE_USER);
920 if (length)
921 goto out;
922
923 length = -ENOMEM;
924 con = kzalloc(size + 1, GFP_KERNEL);
925 if (!con)
926 goto out;
927
928 length = -ENOMEM;
929 user = kzalloc(size + 1, GFP_KERNEL);
930 if (!user)
931 goto out;
932
933 length = -EINVAL;
934 if (sscanf(buf, "%s %s", con, user) != 2)
935 goto out;
936
937 length = security_context_to_sid(con, strlen(con) + 1, &sid);
938 if (length)
939 goto out;
940
941 length = security_get_user_sids(sid, user, &sids, &nsids);
942 if (length)
943 goto out;
944
945 length = sprintf(buf, "%u", nsids) + 1;
946 ptr = buf + length;
947 for (i = 0; i < nsids; i++) {
948 rc = security_sid_to_context(sids[i], &newcon, &len);
949 if (rc) {
950 length = rc;
951 goto out;
952 }
953 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
954 kfree(newcon);
955 length = -ERANGE;
956 goto out;
957 }
958 memcpy(ptr, newcon, len);
959 kfree(newcon);
960 ptr += len;
961 length += len;
962 }
963 out:
964 kfree(sids);
965 kfree(user);
966 kfree(con);
967 return length;
968 }
969
970 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
971 {
972 char *scon = NULL, *tcon = NULL;
973 u32 ssid, tsid, newsid;
974 u16 tclass;
975 ssize_t length;
976 char *newcon = NULL;
977 u32 len;
978
979 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
980 if (length)
981 goto out;
982
983 length = -ENOMEM;
984 scon = kzalloc(size + 1, GFP_KERNEL);
985 if (!scon)
986 goto out;
987
988 length = -ENOMEM;
989 tcon = kzalloc(size + 1, GFP_KERNEL);
990 if (!tcon)
991 goto out;
992
993 length = -EINVAL;
994 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
995 goto out;
996
997 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
998 if (length)
999 goto out;
1000
1001 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
1002 if (length)
1003 goto out;
1004
1005 length = security_member_sid(ssid, tsid, tclass, &newsid);
1006 if (length)
1007 goto out;
1008
1009 length = security_sid_to_context(newsid, &newcon, &len);
1010 if (length)
1011 goto out;
1012
1013 length = -ERANGE;
1014 if (len > SIMPLE_TRANSACTION_LIMIT) {
1015 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1016 "payload max\n", __func__, len);
1017 goto out;
1018 }
1019
1020 memcpy(buf, newcon, len);
1021 length = len;
1022 out:
1023 kfree(newcon);
1024 kfree(tcon);
1025 kfree(scon);
1026 return length;
1027 }
1028
1029 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1030 {
1031 struct inode *ret = new_inode(sb);
1032
1033 if (ret) {
1034 ret->i_mode = mode;
1035 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1036 }
1037 return ret;
1038 }
1039
1040 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1041 size_t count, loff_t *ppos)
1042 {
1043 char *page = NULL;
1044 ssize_t length;
1045 ssize_t ret;
1046 int cur_enforcing;
1047 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1048 const char *name = filep->f_path.dentry->d_name.name;
1049
1050 mutex_lock(&sel_mutex);
1051
1052 ret = -EINVAL;
1053 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1054 goto out;
1055
1056 ret = -ENOMEM;
1057 page = (char *)get_zeroed_page(GFP_KERNEL);
1058 if (!page)
1059 goto out;
1060
1061 cur_enforcing = security_get_bool_value(index);
1062 if (cur_enforcing < 0) {
1063 ret = cur_enforcing;
1064 goto out;
1065 }
1066 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1067 bool_pending_values[index]);
1068 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1069 out:
1070 mutex_unlock(&sel_mutex);
1071 free_page((unsigned long)page);
1072 return ret;
1073 }
1074
1075 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1076 size_t count, loff_t *ppos)
1077 {
1078 char *page = NULL;
1079 ssize_t length;
1080 int new_value;
1081 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1082 const char *name = filep->f_path.dentry->d_name.name;
1083
1084 mutex_lock(&sel_mutex);
1085
1086 length = task_has_security(current, SECURITY__SETBOOL);
1087 if (length)
1088 goto out;
1089
1090 length = -EINVAL;
1091 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1092 goto out;
1093
1094 length = -ENOMEM;
1095 if (count >= PAGE_SIZE)
1096 goto out;
1097
1098 /* No partial writes. */
1099 length = -EINVAL;
1100 if (*ppos != 0)
1101 goto out;
1102
1103 length = -ENOMEM;
1104 page = (char *)get_zeroed_page(GFP_KERNEL);
1105 if (!page)
1106 goto out;
1107
1108 length = -EFAULT;
1109 if (copy_from_user(page, buf, count))
1110 goto out;
1111
1112 length = -EINVAL;
1113 if (sscanf(page, "%d", &new_value) != 1)
1114 goto out;
1115
1116 if (new_value)
1117 new_value = 1;
1118
1119 bool_pending_values[index] = new_value;
1120 length = count;
1121
1122 out:
1123 mutex_unlock(&sel_mutex);
1124 free_page((unsigned long) page);
1125 return length;
1126 }
1127
1128 static const struct file_operations sel_bool_ops = {
1129 .read = sel_read_bool,
1130 .write = sel_write_bool,
1131 .llseek = generic_file_llseek,
1132 };
1133
1134 static ssize_t sel_commit_bools_write(struct file *filep,
1135 const char __user *buf,
1136 size_t count, loff_t *ppos)
1137 {
1138 char *page = NULL;
1139 ssize_t length;
1140 int new_value;
1141
1142 mutex_lock(&sel_mutex);
1143
1144 length = task_has_security(current, SECURITY__SETBOOL);
1145 if (length)
1146 goto out;
1147
1148 length = -ENOMEM;
1149 if (count >= PAGE_SIZE)
1150 goto out;
1151
1152 /* No partial writes. */
1153 length = -EINVAL;
1154 if (*ppos != 0)
1155 goto out;
1156
1157 length = -ENOMEM;
1158 page = (char *)get_zeroed_page(GFP_KERNEL);
1159 if (!page)
1160 goto out;
1161
1162 length = -EFAULT;
1163 if (copy_from_user(page, buf, count))
1164 goto out;
1165
1166 length = -EINVAL;
1167 if (sscanf(page, "%d", &new_value) != 1)
1168 goto out;
1169
1170 length = 0;
1171 if (new_value && bool_pending_values)
1172 length = security_set_bools(bool_num, bool_pending_values);
1173
1174 if (!length)
1175 length = count;
1176
1177 out:
1178 mutex_unlock(&sel_mutex);
1179 free_page((unsigned long) page);
1180 return length;
1181 }
1182
1183 static const struct file_operations sel_commit_bools_ops = {
1184 .write = sel_commit_bools_write,
1185 .llseek = generic_file_llseek,
1186 };
1187
1188 static void sel_remove_entries(struct dentry *de)
1189 {
1190 struct list_head *node;
1191
1192 spin_lock(&de->d_lock);
1193 node = de->d_subdirs.next;
1194 while (node != &de->d_subdirs) {
1195 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1196
1197 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1198 list_del_init(node);
1199
1200 if (d->d_inode) {
1201 dget_dlock(d);
1202 spin_unlock(&de->d_lock);
1203 spin_unlock(&d->d_lock);
1204 d_delete(d);
1205 simple_unlink(de->d_inode, d);
1206 dput(d);
1207 spin_lock(&de->d_lock);
1208 } else
1209 spin_unlock(&d->d_lock);
1210 node = de->d_subdirs.next;
1211 }
1212
1213 spin_unlock(&de->d_lock);
1214 }
1215
1216 #define BOOL_DIR_NAME "booleans"
1217
1218 static int sel_make_bools(void)
1219 {
1220 int i, ret;
1221 ssize_t len;
1222 struct dentry *dentry = NULL;
1223 struct dentry *dir = bool_dir;
1224 struct inode *inode = NULL;
1225 struct inode_security_struct *isec;
1226 char **names = NULL, *page;
1227 int num;
1228 int *values = NULL;
1229 u32 sid;
1230
1231 /* remove any existing files */
1232 for (i = 0; i < bool_num; i++)
1233 kfree(bool_pending_names[i]);
1234 kfree(bool_pending_names);
1235 kfree(bool_pending_values);
1236 bool_num = 0;
1237 bool_pending_names = NULL;
1238 bool_pending_values = NULL;
1239
1240 sel_remove_entries(dir);
1241
1242 ret = -ENOMEM;
1243 page = (char *)get_zeroed_page(GFP_KERNEL);
1244 if (!page)
1245 goto out;
1246
1247 ret = security_get_bools(&num, &names, &values);
1248 if (ret)
1249 goto out;
1250
1251 for (i = 0; i < num; i++) {
1252 ret = -ENOMEM;
1253 dentry = d_alloc_name(dir, names[i]);
1254 if (!dentry)
1255 goto out;
1256
1257 ret = -ENOMEM;
1258 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1259 if (!inode)
1260 goto out;
1261
1262 ret = -ENAMETOOLONG;
1263 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1264 if (len >= PAGE_SIZE)
1265 goto out;
1266
1267 isec = (struct inode_security_struct *)inode->i_security;
1268 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1269 if (ret)
1270 goto out;
1271
1272 isec->sid = sid;
1273 isec->initialized = 1;
1274 inode->i_fop = &sel_bool_ops;
1275 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1276 d_add(dentry, inode);
1277 }
1278 bool_num = num;
1279 bool_pending_names = names;
1280 bool_pending_values = values;
1281
1282 free_page((unsigned long)page);
1283 return 0;
1284 out:
1285 free_page((unsigned long)page);
1286
1287 if (names) {
1288 for (i = 0; i < num; i++)
1289 kfree(names[i]);
1290 kfree(names);
1291 }
1292 kfree(values);
1293 sel_remove_entries(dir);
1294
1295 return ret;
1296 }
1297
1298 #define NULL_FILE_NAME "null"
1299
1300 struct path selinux_null;
1301
1302 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1303 size_t count, loff_t *ppos)
1304 {
1305 char tmpbuf[TMPBUFLEN];
1306 ssize_t length;
1307
1308 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1309 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1310 }
1311
1312 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1313 const char __user *buf,
1314 size_t count, loff_t *ppos)
1315
1316 {
1317 char *page = NULL;
1318 ssize_t ret;
1319 int new_value;
1320
1321 ret = task_has_security(current, SECURITY__SETSECPARAM);
1322 if (ret)
1323 goto out;
1324
1325 ret = -ENOMEM;
1326 if (count >= PAGE_SIZE)
1327 goto out;
1328
1329 /* No partial writes. */
1330 ret = -EINVAL;
1331 if (*ppos != 0)
1332 goto out;
1333
1334 ret = -ENOMEM;
1335 page = (char *)get_zeroed_page(GFP_KERNEL);
1336 if (!page)
1337 goto out;
1338
1339 ret = -EFAULT;
1340 if (copy_from_user(page, buf, count))
1341 goto out;
1342
1343 ret = -EINVAL;
1344 if (sscanf(page, "%u", &new_value) != 1)
1345 goto out;
1346
1347 avc_cache_threshold = new_value;
1348
1349 ret = count;
1350 out:
1351 free_page((unsigned long)page);
1352 return ret;
1353 }
1354
1355 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1356 size_t count, loff_t *ppos)
1357 {
1358 char *page;
1359 ssize_t length;
1360
1361 page = (char *)__get_free_page(GFP_KERNEL);
1362 if (!page)
1363 return -ENOMEM;
1364
1365 length = avc_get_hash_stats(page);
1366 if (length >= 0)
1367 length = simple_read_from_buffer(buf, count, ppos, page, length);
1368 free_page((unsigned long)page);
1369
1370 return length;
1371 }
1372
1373 static const struct file_operations sel_avc_cache_threshold_ops = {
1374 .read = sel_read_avc_cache_threshold,
1375 .write = sel_write_avc_cache_threshold,
1376 .llseek = generic_file_llseek,
1377 };
1378
1379 static const struct file_operations sel_avc_hash_stats_ops = {
1380 .read = sel_read_avc_hash_stats,
1381 .llseek = generic_file_llseek,
1382 };
1383
1384 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1385 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1386 {
1387 int cpu;
1388
1389 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1390 if (!cpu_possible(cpu))
1391 continue;
1392 *idx = cpu + 1;
1393 return &per_cpu(avc_cache_stats, cpu);
1394 }
1395 return NULL;
1396 }
1397
1398 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1399 {
1400 loff_t n = *pos - 1;
1401
1402 if (*pos == 0)
1403 return SEQ_START_TOKEN;
1404
1405 return sel_avc_get_stat_idx(&n);
1406 }
1407
1408 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1409 {
1410 return sel_avc_get_stat_idx(pos);
1411 }
1412
1413 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1414 {
1415 struct avc_cache_stats *st = v;
1416
1417 if (v == SEQ_START_TOKEN)
1418 seq_printf(seq, "lookups hits misses allocations reclaims "
1419 "frees\n");
1420 else {
1421 unsigned int lookups = st->lookups;
1422 unsigned int misses = st->misses;
1423 unsigned int hits = lookups - misses;
1424 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1425 hits, misses, st->allocations,
1426 st->reclaims, st->frees);
1427 }
1428 return 0;
1429 }
1430
1431 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1432 { }
1433
1434 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1435 .start = sel_avc_stats_seq_start,
1436 .next = sel_avc_stats_seq_next,
1437 .show = sel_avc_stats_seq_show,
1438 .stop = sel_avc_stats_seq_stop,
1439 };
1440
1441 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1442 {
1443 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1444 }
1445
1446 static const struct file_operations sel_avc_cache_stats_ops = {
1447 .open = sel_open_avc_cache_stats,
1448 .read = seq_read,
1449 .llseek = seq_lseek,
1450 .release = seq_release,
1451 };
1452 #endif
1453
1454 static int sel_make_avc_files(struct dentry *dir)
1455 {
1456 int i;
1457 static struct tree_descr files[] = {
1458 { "cache_threshold",
1459 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1460 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1461 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1462 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1463 #endif
1464 };
1465
1466 for (i = 0; i < ARRAY_SIZE(files); i++) {
1467 struct inode *inode;
1468 struct dentry *dentry;
1469
1470 dentry = d_alloc_name(dir, files[i].name);
1471 if (!dentry)
1472 return -ENOMEM;
1473
1474 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1475 if (!inode)
1476 return -ENOMEM;
1477
1478 inode->i_fop = files[i].ops;
1479 inode->i_ino = ++sel_last_ino;
1480 d_add(dentry, inode);
1481 }
1482
1483 return 0;
1484 }
1485
1486 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1487 size_t count, loff_t *ppos)
1488 {
1489 char *con;
1490 u32 sid, len;
1491 ssize_t ret;
1492
1493 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1494 ret = security_sid_to_context(sid, &con, &len);
1495 if (ret)
1496 return ret;
1497
1498 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1499 kfree(con);
1500 return ret;
1501 }
1502
1503 static const struct file_operations sel_initcon_ops = {
1504 .read = sel_read_initcon,
1505 .llseek = generic_file_llseek,
1506 };
1507
1508 static int sel_make_initcon_files(struct dentry *dir)
1509 {
1510 int i;
1511
1512 for (i = 1; i <= SECINITSID_NUM; i++) {
1513 struct inode *inode;
1514 struct dentry *dentry;
1515 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1516 if (!dentry)
1517 return -ENOMEM;
1518
1519 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1520 if (!inode)
1521 return -ENOMEM;
1522
1523 inode->i_fop = &sel_initcon_ops;
1524 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1525 d_add(dentry, inode);
1526 }
1527
1528 return 0;
1529 }
1530
1531 static inline unsigned long sel_class_to_ino(u16 class)
1532 {
1533 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1534 }
1535
1536 static inline u16 sel_ino_to_class(unsigned long ino)
1537 {
1538 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1539 }
1540
1541 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1542 {
1543 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1544 }
1545
1546 static inline u32 sel_ino_to_perm(unsigned long ino)
1547 {
1548 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1549 }
1550
1551 static ssize_t sel_read_class(struct file *file, char __user *buf,
1552 size_t count, loff_t *ppos)
1553 {
1554 unsigned long ino = file_inode(file)->i_ino;
1555 char res[TMPBUFLEN];
1556 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1557 return simple_read_from_buffer(buf, count, ppos, res, len);
1558 }
1559
1560 static const struct file_operations sel_class_ops = {
1561 .read = sel_read_class,
1562 .llseek = generic_file_llseek,
1563 };
1564
1565 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1566 size_t count, loff_t *ppos)
1567 {
1568 unsigned long ino = file_inode(file)->i_ino;
1569 char res[TMPBUFLEN];
1570 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1571 return simple_read_from_buffer(buf, count, ppos, res, len);
1572 }
1573
1574 static const struct file_operations sel_perm_ops = {
1575 .read = sel_read_perm,
1576 .llseek = generic_file_llseek,
1577 };
1578
1579 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1580 size_t count, loff_t *ppos)
1581 {
1582 int value;
1583 char tmpbuf[TMPBUFLEN];
1584 ssize_t length;
1585 unsigned long i_ino = file_inode(file)->i_ino;
1586
1587 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1588 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1589
1590 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1591 }
1592
1593 static const struct file_operations sel_policycap_ops = {
1594 .read = sel_read_policycap,
1595 .llseek = generic_file_llseek,
1596 };
1597
1598 static int sel_make_perm_files(char *objclass, int classvalue,
1599 struct dentry *dir)
1600 {
1601 int i, rc, nperms;
1602 char **perms;
1603
1604 rc = security_get_permissions(objclass, &perms, &nperms);
1605 if (rc)
1606 return rc;
1607
1608 for (i = 0; i < nperms; i++) {
1609 struct inode *inode;
1610 struct dentry *dentry;
1611
1612 rc = -ENOMEM;
1613 dentry = d_alloc_name(dir, perms[i]);
1614 if (!dentry)
1615 goto out;
1616
1617 rc = -ENOMEM;
1618 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1619 if (!inode)
1620 goto out;
1621
1622 inode->i_fop = &sel_perm_ops;
1623 /* i+1 since perm values are 1-indexed */
1624 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1625 d_add(dentry, inode);
1626 }
1627 rc = 0;
1628 out:
1629 for (i = 0; i < nperms; i++)
1630 kfree(perms[i]);
1631 kfree(perms);
1632 return rc;
1633 }
1634
1635 static int sel_make_class_dir_entries(char *classname, int index,
1636 struct dentry *dir)
1637 {
1638 struct dentry *dentry = NULL;
1639 struct inode *inode = NULL;
1640 int rc;
1641
1642 dentry = d_alloc_name(dir, "index");
1643 if (!dentry)
1644 return -ENOMEM;
1645
1646 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1647 if (!inode)
1648 return -ENOMEM;
1649
1650 inode->i_fop = &sel_class_ops;
1651 inode->i_ino = sel_class_to_ino(index);
1652 d_add(dentry, inode);
1653
1654 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1655 if (IS_ERR(dentry))
1656 return PTR_ERR(dentry);
1657
1658 rc = sel_make_perm_files(classname, index, dentry);
1659
1660 return rc;
1661 }
1662
1663 static void sel_remove_classes(void)
1664 {
1665 struct list_head *class_node;
1666
1667 list_for_each(class_node, &class_dir->d_subdirs) {
1668 struct dentry *class_subdir = list_entry(class_node,
1669 struct dentry, d_u.d_child);
1670 struct list_head *class_subdir_node;
1671
1672 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1673 struct dentry *d = list_entry(class_subdir_node,
1674 struct dentry, d_u.d_child);
1675
1676 if (d->d_inode)
1677 if (d->d_inode->i_mode & S_IFDIR)
1678 sel_remove_entries(d);
1679 }
1680
1681 sel_remove_entries(class_subdir);
1682 }
1683
1684 sel_remove_entries(class_dir);
1685 }
1686
1687 static int sel_make_classes(void)
1688 {
1689 int rc, nclasses, i;
1690 char **classes;
1691
1692 /* delete any existing entries */
1693 sel_remove_classes();
1694
1695 rc = security_get_classes(&classes, &nclasses);
1696 if (rc)
1697 return rc;
1698
1699 /* +2 since classes are 1-indexed */
1700 last_class_ino = sel_class_to_ino(nclasses + 2);
1701
1702 for (i = 0; i < nclasses; i++) {
1703 struct dentry *class_name_dir;
1704
1705 class_name_dir = sel_make_dir(class_dir, classes[i],
1706 &last_class_ino);
1707 if (IS_ERR(class_name_dir)) {
1708 rc = PTR_ERR(class_name_dir);
1709 goto out;
1710 }
1711
1712 /* i+1 since class values are 1-indexed */
1713 rc = sel_make_class_dir_entries(classes[i], i + 1,
1714 class_name_dir);
1715 if (rc)
1716 goto out;
1717 }
1718 rc = 0;
1719 out:
1720 for (i = 0; i < nclasses; i++)
1721 kfree(classes[i]);
1722 kfree(classes);
1723 return rc;
1724 }
1725
1726 static int sel_make_policycap(void)
1727 {
1728 unsigned int iter;
1729 struct dentry *dentry = NULL;
1730 struct inode *inode = NULL;
1731
1732 sel_remove_entries(policycap_dir);
1733
1734 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1735 if (iter < ARRAY_SIZE(policycap_names))
1736 dentry = d_alloc_name(policycap_dir,
1737 policycap_names[iter]);
1738 else
1739 dentry = d_alloc_name(policycap_dir, "unknown");
1740
1741 if (dentry == NULL)
1742 return -ENOMEM;
1743
1744 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1745 if (inode == NULL)
1746 return -ENOMEM;
1747
1748 inode->i_fop = &sel_policycap_ops;
1749 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1750 d_add(dentry, inode);
1751 }
1752
1753 return 0;
1754 }
1755
1756 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1757 unsigned long *ino)
1758 {
1759 struct dentry *dentry = d_alloc_name(dir, name);
1760 struct inode *inode;
1761
1762 if (!dentry)
1763 return ERR_PTR(-ENOMEM);
1764
1765 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1766 if (!inode) {
1767 dput(dentry);
1768 return ERR_PTR(-ENOMEM);
1769 }
1770
1771 inode->i_op = &simple_dir_inode_operations;
1772 inode->i_fop = &simple_dir_operations;
1773 inode->i_ino = ++(*ino);
1774 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1775 inc_nlink(inode);
1776 d_add(dentry, inode);
1777 /* bump link count on parent directory, too */
1778 inc_nlink(dir->d_inode);
1779
1780 return dentry;
1781 }
1782
1783 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1784 {
1785 int ret;
1786 struct dentry *dentry;
1787 struct inode *inode;
1788 struct inode_security_struct *isec;
1789
1790 static struct tree_descr selinux_files[] = {
1791 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1792 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1793 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1794 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1795 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1799 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1800 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1801 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1802 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1804 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1805 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1806 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1807 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1808 /* last one */ {""}
1809 };
1810 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1811 if (ret)
1812 goto err;
1813
1814 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1815 if (IS_ERR(bool_dir)) {
1816 ret = PTR_ERR(bool_dir);
1817 bool_dir = NULL;
1818 goto err;
1819 }
1820
1821 ret = -ENOMEM;
1822 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1823 if (!dentry)
1824 goto err;
1825
1826 ret = -ENOMEM;
1827 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1828 if (!inode)
1829 goto err;
1830
1831 inode->i_ino = ++sel_last_ino;
1832 isec = (struct inode_security_struct *)inode->i_security;
1833 isec->sid = SECINITSID_DEVNULL;
1834 isec->sclass = SECCLASS_CHR_FILE;
1835 isec->initialized = 1;
1836
1837 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1838 d_add(dentry, inode);
1839 selinux_null.dentry = dentry;
1840
1841 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1842 if (IS_ERR(dentry)) {
1843 ret = PTR_ERR(dentry);
1844 goto err;
1845 }
1846
1847 ret = sel_make_avc_files(dentry);
1848 if (ret)
1849 goto err;
1850
1851 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1852 if (IS_ERR(dentry)) {
1853 ret = PTR_ERR(dentry);
1854 goto err;
1855 }
1856
1857 ret = sel_make_initcon_files(dentry);
1858 if (ret)
1859 goto err;
1860
1861 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1862 if (IS_ERR(class_dir)) {
1863 ret = PTR_ERR(class_dir);
1864 class_dir = NULL;
1865 goto err;
1866 }
1867
1868 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1869 if (IS_ERR(policycap_dir)) {
1870 ret = PTR_ERR(policycap_dir);
1871 policycap_dir = NULL;
1872 goto err;
1873 }
1874 return 0;
1875 err:
1876 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1877 __func__);
1878 return ret;
1879 }
1880
1881 static struct dentry *sel_mount(struct file_system_type *fs_type,
1882 int flags, const char *dev_name, void *data)
1883 {
1884 return mount_single(fs_type, flags, data, sel_fill_super);
1885 }
1886
1887 static struct file_system_type sel_fs_type = {
1888 .name = "selinuxfs",
1889 .mount = sel_mount,
1890 .kill_sb = kill_litter_super,
1891 };
1892
1893 struct vfsmount *selinuxfs_mount;
1894 static struct kobject *selinuxfs_kobj;
1895
1896 static int __init init_sel_fs(void)
1897 {
1898 int err;
1899
1900 if (!selinux_enabled)
1901 return 0;
1902
1903 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1904 if (!selinuxfs_kobj)
1905 return -ENOMEM;
1906
1907 err = register_filesystem(&sel_fs_type);
1908 if (err) {
1909 kobject_put(selinuxfs_kobj);
1910 return err;
1911 }
1912
1913 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1914 if (IS_ERR(selinuxfs_mount)) {
1915 printk(KERN_ERR "selinuxfs: could not mount!\n");
1916 err = PTR_ERR(selinuxfs_mount);
1917 selinuxfs_mount = NULL;
1918 }
1919
1920 return err;
1921 }
1922
1923 __initcall(init_sel_fs);
1924
1925 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1926 void exit_sel_fs(void)
1927 {
1928 kobject_put(selinuxfs_kobj);
1929 kern_unmount(selinuxfs_mount);
1930 unregister_filesystem(&sel_fs_type);
1931 }
1932 #endif
Linux kernel - Deliverables
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