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43deac2194912522d1d7a719f3ab1cb84408230c
[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.moore@hp.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
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33 Based on the proc code and the fs/nfsd/nfsctl.c code. */
34
35 #include "flask.h"
36 #include "avc.h"
37 #include "avc_ss.h"
38 #include "security.h"
39 #include "objsec.h"
40 #include "conditional.h"
41
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44 "network_peer_controls",
45 "open_perms"
46 };
47
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50 static int __init checkreqprot_setup(char *str)
51 {
52 unsigned long checkreqprot;
53 if (!strict_strtoul(str, 0, &checkreqprot))
54 selinux_checkreqprot = checkreqprot ? 1 : 0;
55 return 1;
56 }
57 __setup("checkreqprot=", checkreqprot_setup);
58
59 static DEFINE_MUTEX(sel_mutex);
60
61 /* global data for booleans */
62 static struct dentry *bool_dir;
63 static int bool_num;
64 static char **bool_pending_names;
65 static int *bool_pending_values;
66
67 /* global data for classes */
68 static struct dentry *class_dir;
69 static unsigned long last_class_ino;
70
71 static char policy_opened;
72
73 /* global data for policy capabilities */
74 static struct dentry *policycap_dir;
75
76 extern void selnl_notify_setenforce(int val);
77
78 /* Check whether a task is allowed to use a security operation. */
79 static int task_has_security(struct task_struct *tsk,
80 u32 perms)
81 {
82 const struct task_security_struct *tsec;
83 u32 sid = 0;
84
85 rcu_read_lock();
86 tsec = __task_cred(tsk)->security;
87 if (tsec)
88 sid = tsec->sid;
89 rcu_read_unlock();
90 if (!tsec)
91 return -EACCES;
92
93 return avc_has_perm(sid, SECINITSID_SECURITY,
94 SECCLASS_SECURITY, perms, NULL);
95 }
96
97 enum sel_inos {
98 SEL_ROOT_INO = 2,
99 SEL_LOAD, /* load policy */
100 SEL_ENFORCE, /* get or set enforcing status */
101 SEL_CONTEXT, /* validate context */
102 SEL_ACCESS, /* compute access decision */
103 SEL_CREATE, /* compute create labeling decision */
104 SEL_RELABEL, /* compute relabeling decision */
105 SEL_USER, /* compute reachable user contexts */
106 SEL_POLICYVERS, /* return policy version for this kernel */
107 SEL_COMMIT_BOOLS, /* commit new boolean values */
108 SEL_MLS, /* return if MLS policy is enabled */
109 SEL_DISABLE, /* disable SELinux until next reboot */
110 SEL_MEMBER, /* compute polyinstantiation membership decision */
111 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
112 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
113 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
114 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
115 SEL_STATUS, /* export current status using mmap() */
116 SEL_POLICY, /* allow userspace to read the in kernel policy */
117 SEL_INO_NEXT, /* The next inode number to use */
118 };
119
120 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
121
122 #define SEL_INITCON_INO_OFFSET 0x01000000
123 #define SEL_BOOL_INO_OFFSET 0x02000000
124 #define SEL_CLASS_INO_OFFSET 0x04000000
125 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
126 #define SEL_INO_MASK 0x00ffffff
127
128 #define TMPBUFLEN 12
129 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
130 size_t count, loff_t *ppos)
131 {
132 char tmpbuf[TMPBUFLEN];
133 ssize_t length;
134
135 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
136 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
137 }
138
139 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
140 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
141 size_t count, loff_t *ppos)
142
143 {
144 char *page;
145 ssize_t length;
146 int new_value;
147
148 if (count >= PAGE_SIZE)
149 return -ENOMEM;
150 if (*ppos != 0) {
151 /* No partial writes. */
152 return -EINVAL;
153 }
154 page = (char *)get_zeroed_page(GFP_KERNEL);
155 if (!page)
156 return -ENOMEM;
157 length = -EFAULT;
158 if (copy_from_user(page, buf, count))
159 goto out;
160
161 length = -EINVAL;
162 if (sscanf(page, "%d", &new_value) != 1)
163 goto out;
164
165 if (new_value != selinux_enforcing) {
166 length = task_has_security(current, SECURITY__SETENFORCE);
167 if (length)
168 goto out;
169 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
171 new_value, selinux_enforcing,
172 audit_get_loginuid(current),
173 audit_get_sessionid(current));
174 selinux_enforcing = new_value;
175 if (selinux_enforcing)
176 avc_ss_reset(0);
177 selnl_notify_setenforce(selinux_enforcing);
178 selinux_status_update_setenforce(selinux_enforcing);
179 }
180 length = count;
181 out:
182 free_page((unsigned long) page);
183 return length;
184 }
185 #else
186 #define sel_write_enforce NULL
187 #endif
188
189 static const struct file_operations sel_enforce_ops = {
190 .read = sel_read_enforce,
191 .write = sel_write_enforce,
192 .llseek = generic_file_llseek,
193 };
194
195 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
196 size_t count, loff_t *ppos)
197 {
198 char tmpbuf[TMPBUFLEN];
199 ssize_t length;
200 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
201 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
202 security_get_reject_unknown() : !security_get_allow_unknown();
203
204 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
205 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
206 }
207
208 static const struct file_operations sel_handle_unknown_ops = {
209 .read = sel_read_handle_unknown,
210 .llseek = generic_file_llseek,
211 };
212
213 static int sel_open_handle_status(struct inode *inode, struct file *filp)
214 {
215 struct page *status = selinux_kernel_status_page();
216
217 if (!status)
218 return -ENOMEM;
219
220 filp->private_data = status;
221
222 return 0;
223 }
224
225 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
226 size_t count, loff_t *ppos)
227 {
228 struct page *status = filp->private_data;
229
230 BUG_ON(!status);
231
232 return simple_read_from_buffer(buf, count, ppos,
233 page_address(status),
234 sizeof(struct selinux_kernel_status));
235 }
236
237 static int sel_mmap_handle_status(struct file *filp,
238 struct vm_area_struct *vma)
239 {
240 struct page *status = filp->private_data;
241 unsigned long size = vma->vm_end - vma->vm_start;
242
243 BUG_ON(!status);
244
245 /* only allows one page from the head */
246 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
247 return -EIO;
248 /* disallow writable mapping */
249 if (vma->vm_flags & VM_WRITE)
250 return -EPERM;
251 /* disallow mprotect() turns it into writable */
252 vma->vm_flags &= ~VM_MAYWRITE;
253
254 return remap_pfn_range(vma, vma->vm_start,
255 page_to_pfn(status),
256 size, vma->vm_page_prot);
257 }
258
259 static const struct file_operations sel_handle_status_ops = {
260 .open = sel_open_handle_status,
261 .read = sel_read_handle_status,
262 .mmap = sel_mmap_handle_status,
263 .llseek = generic_file_llseek,
264 };
265
266 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
267 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
268 size_t count, loff_t *ppos)
269
270 {
271 char *page;
272 ssize_t length;
273 int new_value;
274 extern int selinux_disable(void);
275
276 if (count >= PAGE_SIZE)
277 return -ENOMEM;
278 if (*ppos != 0) {
279 /* No partial writes. */
280 return -EINVAL;
281 }
282 page = (char *)get_zeroed_page(GFP_KERNEL);
283 if (!page)
284 return -ENOMEM;
285 length = -EFAULT;
286 if (copy_from_user(page, buf, count))
287 goto out;
288
289 length = -EINVAL;
290 if (sscanf(page, "%d", &new_value) != 1)
291 goto out;
292
293 if (new_value) {
294 length = selinux_disable();
295 if (length < 0)
296 goto out;
297 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
298 "selinux=0 auid=%u ses=%u",
299 audit_get_loginuid(current),
300 audit_get_sessionid(current));
301 }
302
303 length = count;
304 out:
305 free_page((unsigned long) page);
306 return length;
307 }
308 #else
309 #define sel_write_disable NULL
310 #endif
311
312 static const struct file_operations sel_disable_ops = {
313 .write = sel_write_disable,
314 .llseek = generic_file_llseek,
315 };
316
317 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
318 size_t count, loff_t *ppos)
319 {
320 char tmpbuf[TMPBUFLEN];
321 ssize_t length;
322
323 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
324 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
325 }
326
327 static const struct file_operations sel_policyvers_ops = {
328 .read = sel_read_policyvers,
329 .llseek = generic_file_llseek,
330 };
331
332 /* declaration for sel_write_load */
333 static int sel_make_bools(void);
334 static int sel_make_classes(void);
335 static int sel_make_policycap(void);
336
337 /* declaration for sel_make_class_dirs */
338 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
339 unsigned long *ino);
340
341 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
342 size_t count, loff_t *ppos)
343 {
344 char tmpbuf[TMPBUFLEN];
345 ssize_t length;
346
347 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
348 security_mls_enabled());
349 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
350 }
351
352 static const struct file_operations sel_mls_ops = {
353 .read = sel_read_mls,
354 .llseek = generic_file_llseek,
355 };
356
357 struct policy_load_memory {
358 size_t len;
359 void *data;
360 };
361
362 static int sel_open_policy(struct inode *inode, struct file *filp)
363 {
364 struct policy_load_memory *plm = NULL;
365 int rc;
366
367 BUG_ON(filp->private_data);
368
369 mutex_lock(&sel_mutex);
370
371 rc = task_has_security(current, SECURITY__READ_POLICY);
372 if (rc)
373 goto err;
374
375 rc = -EBUSY;
376 if (policy_opened)
377 goto err;
378
379 rc = -ENOMEM;
380 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
381 if (!plm)
382 goto err;
383
384 if (i_size_read(inode) != security_policydb_len()) {
385 mutex_lock(&inode->i_mutex);
386 i_size_write(inode, security_policydb_len());
387 mutex_unlock(&inode->i_mutex);
388 }
389
390 rc = security_read_policy(&plm->data, &plm->len);
391 if (rc)
392 goto err;
393
394 policy_opened = 1;
395
396 filp->private_data = plm;
397
398 mutex_unlock(&sel_mutex);
399
400 return 0;
401 err:
402 mutex_unlock(&sel_mutex);
403
404 if (plm)
405 vfree(plm->data);
406 kfree(plm);
407 return rc;
408 }
409
410 static int sel_release_policy(struct inode *inode, struct file *filp)
411 {
412 struct policy_load_memory *plm = filp->private_data;
413
414 BUG_ON(!plm);
415
416 policy_opened = 0;
417
418 vfree(plm->data);
419 kfree(plm);
420
421 return 0;
422 }
423
424 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
425 size_t count, loff_t *ppos)
426 {
427 struct policy_load_memory *plm = filp->private_data;
428 int ret;
429
430 mutex_lock(&sel_mutex);
431
432 ret = task_has_security(current, SECURITY__READ_POLICY);
433 if (ret)
434 goto out;
435
436 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
437 out:
438 mutex_unlock(&sel_mutex);
439 return ret;
440 }
441
442 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
443 struct vm_fault *vmf)
444 {
445 struct policy_load_memory *plm = vma->vm_file->private_data;
446 unsigned long offset;
447 struct page *page;
448
449 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
450 return VM_FAULT_SIGBUS;
451
452 offset = vmf->pgoff << PAGE_SHIFT;
453 if (offset >= roundup(plm->len, PAGE_SIZE))
454 return VM_FAULT_SIGBUS;
455
456 page = vmalloc_to_page(plm->data + offset);
457 get_page(page);
458
459 vmf->page = page;
460
461 return 0;
462 }
463
464 static struct vm_operations_struct sel_mmap_policy_ops = {
465 .fault = sel_mmap_policy_fault,
466 .page_mkwrite = sel_mmap_policy_fault,
467 };
468
469 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
470 {
471 if (vma->vm_flags & VM_SHARED) {
472 /* do not allow mprotect to make mapping writable */
473 vma->vm_flags &= ~VM_MAYWRITE;
474
475 if (vma->vm_flags & VM_WRITE)
476 return -EACCES;
477 }
478
479 vma->vm_flags |= VM_RESERVED;
480 vma->vm_ops = &sel_mmap_policy_ops;
481
482 return 0;
483 }
484
485 static const struct file_operations sel_policy_ops = {
486 .open = sel_open_policy,
487 .read = sel_read_policy,
488 .mmap = sel_mmap_policy,
489 .release = sel_release_policy,
490 };
491
492 static ssize_t sel_write_load(struct file *file, const char __user *buf,
493 size_t count, loff_t *ppos)
494
495 {
496 int ret;
497 ssize_t length;
498 void *data = NULL;
499
500 mutex_lock(&sel_mutex);
501
502 length = task_has_security(current, SECURITY__LOAD_POLICY);
503 if (length)
504 goto out;
505
506 if (*ppos != 0) {
507 /* No partial writes. */
508 length = -EINVAL;
509 goto out;
510 }
511
512 if ((count > 64 * 1024 * 1024)
513 || (data = vmalloc(count)) == NULL) {
514 length = -ENOMEM;
515 goto out;
516 }
517
518 length = -EFAULT;
519 if (copy_from_user(data, buf, count) != 0)
520 goto out;
521
522 length = security_load_policy(data, count);
523 if (length)
524 goto out;
525
526 ret = sel_make_bools();
527 if (ret) {
528 length = ret;
529 goto out1;
530 }
531
532 ret = sel_make_classes();
533 if (ret) {
534 length = ret;
535 goto out1;
536 }
537
538 ret = sel_make_policycap();
539 if (ret)
540 length = ret;
541 else
542 length = count;
543
544 out1:
545 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
546 "policy loaded auid=%u ses=%u",
547 audit_get_loginuid(current),
548 audit_get_sessionid(current));
549 out:
550 mutex_unlock(&sel_mutex);
551 vfree(data);
552 return length;
553 }
554
555 static const struct file_operations sel_load_ops = {
556 .write = sel_write_load,
557 .llseek = generic_file_llseek,
558 };
559
560 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
561 {
562 char *canon;
563 u32 sid, len;
564 ssize_t length;
565
566 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
567 if (length)
568 return length;
569
570 length = security_context_to_sid(buf, size, &sid);
571 if (length < 0)
572 return length;
573
574 length = security_sid_to_context(sid, &canon, &len);
575 if (length < 0)
576 return length;
577
578 if (len > SIMPLE_TRANSACTION_LIMIT) {
579 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
580 "payload max\n", __func__, len);
581 length = -ERANGE;
582 goto out;
583 }
584
585 memcpy(buf, canon, len);
586 length = len;
587 out:
588 kfree(canon);
589 return length;
590 }
591
592 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
593 size_t count, loff_t *ppos)
594 {
595 char tmpbuf[TMPBUFLEN];
596 ssize_t length;
597
598 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
599 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
600 }
601
602 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
603 size_t count, loff_t *ppos)
604 {
605 char *page;
606 ssize_t length;
607 unsigned int new_value;
608
609 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
610 if (length)
611 return length;
612
613 if (count >= PAGE_SIZE)
614 return -ENOMEM;
615 if (*ppos != 0) {
616 /* No partial writes. */
617 return -EINVAL;
618 }
619 page = (char *)get_zeroed_page(GFP_KERNEL);
620 if (!page)
621 return -ENOMEM;
622 length = -EFAULT;
623 if (copy_from_user(page, buf, count))
624 goto out;
625
626 length = -EINVAL;
627 if (sscanf(page, "%u", &new_value) != 1)
628 goto out;
629
630 selinux_checkreqprot = new_value ? 1 : 0;
631 length = count;
632 out:
633 free_page((unsigned long) page);
634 return length;
635 }
636 static const struct file_operations sel_checkreqprot_ops = {
637 .read = sel_read_checkreqprot,
638 .write = sel_write_checkreqprot,
639 .llseek = generic_file_llseek,
640 };
641
642 /*
643 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
644 */
645 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
646 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
647 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
648 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
649 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
650
651 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
652 [SEL_ACCESS] = sel_write_access,
653 [SEL_CREATE] = sel_write_create,
654 [SEL_RELABEL] = sel_write_relabel,
655 [SEL_USER] = sel_write_user,
656 [SEL_MEMBER] = sel_write_member,
657 [SEL_CONTEXT] = sel_write_context,
658 };
659
660 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
661 {
662 ino_t ino = file->f_path.dentry->d_inode->i_ino;
663 char *data;
664 ssize_t rv;
665
666 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
667 return -EINVAL;
668
669 data = simple_transaction_get(file, buf, size);
670 if (IS_ERR(data))
671 return PTR_ERR(data);
672
673 rv = write_op[ino](file, data, size);
674 if (rv > 0) {
675 simple_transaction_set(file, rv);
676 rv = size;
677 }
678 return rv;
679 }
680
681 static const struct file_operations transaction_ops = {
682 .write = selinux_transaction_write,
683 .read = simple_transaction_read,
684 .release = simple_transaction_release,
685 .llseek = generic_file_llseek,
686 };
687
688 /*
689 * payload - write methods
690 * If the method has a response, the response should be put in buf,
691 * and the length returned. Otherwise return 0 or and -error.
692 */
693
694 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
695 {
696 char *scon, *tcon;
697 u32 ssid, tsid;
698 u16 tclass;
699 struct av_decision avd;
700 ssize_t length;
701
702 length = task_has_security(current, SECURITY__COMPUTE_AV);
703 if (length)
704 return length;
705
706 length = -ENOMEM;
707 scon = kzalloc(size + 1, GFP_KERNEL);
708 if (!scon)
709 return length;
710
711 tcon = kzalloc(size + 1, GFP_KERNEL);
712 if (!tcon)
713 goto out;
714
715 length = -EINVAL;
716 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
717 goto out2;
718
719 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
720 if (length < 0)
721 goto out2;
722 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
723 if (length < 0)
724 goto out2;
725
726 security_compute_av_user(ssid, tsid, tclass, &avd);
727
728 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
729 "%x %x %x %x %u %x",
730 avd.allowed, 0xffffffff,
731 avd.auditallow, avd.auditdeny,
732 avd.seqno, avd.flags);
733 out2:
734 kfree(tcon);
735 out:
736 kfree(scon);
737 return length;
738 }
739
740 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
741 {
742 char *scon, *tcon;
743 u32 ssid, tsid, newsid;
744 u16 tclass;
745 ssize_t length;
746 char *newcon;
747 u32 len;
748
749 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
750 if (length)
751 return length;
752
753 length = -ENOMEM;
754 scon = kzalloc(size + 1, GFP_KERNEL);
755 if (!scon)
756 return length;
757
758 tcon = kzalloc(size + 1, GFP_KERNEL);
759 if (!tcon)
760 goto out;
761
762 length = -EINVAL;
763 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
764 goto out2;
765
766 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
767 if (length < 0)
768 goto out2;
769 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
770 if (length < 0)
771 goto out2;
772
773 length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
774 if (length < 0)
775 goto out2;
776
777 length = security_sid_to_context(newsid, &newcon, &len);
778 if (length < 0)
779 goto out2;
780
781 if (len > SIMPLE_TRANSACTION_LIMIT) {
782 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
783 "payload max\n", __func__, len);
784 length = -ERANGE;
785 goto out3;
786 }
787
788 memcpy(buf, newcon, len);
789 length = len;
790 out3:
791 kfree(newcon);
792 out2:
793 kfree(tcon);
794 out:
795 kfree(scon);
796 return length;
797 }
798
799 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
800 {
801 char *scon, *tcon;
802 u32 ssid, tsid, newsid;
803 u16 tclass;
804 ssize_t length;
805 char *newcon;
806 u32 len;
807
808 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
809 if (length)
810 return length;
811
812 length = -ENOMEM;
813 scon = kzalloc(size + 1, GFP_KERNEL);
814 if (!scon)
815 return length;
816
817 tcon = kzalloc(size + 1, GFP_KERNEL);
818 if (!tcon)
819 goto out;
820
821 length = -EINVAL;
822 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
823 goto out2;
824
825 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
826 if (length < 0)
827 goto out2;
828 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
829 if (length < 0)
830 goto out2;
831
832 length = security_change_sid(ssid, tsid, tclass, &newsid);
833 if (length < 0)
834 goto out2;
835
836 length = security_sid_to_context(newsid, &newcon, &len);
837 if (length < 0)
838 goto out2;
839
840 if (len > SIMPLE_TRANSACTION_LIMIT) {
841 length = -ERANGE;
842 goto out3;
843 }
844
845 memcpy(buf, newcon, len);
846 length = len;
847 out3:
848 kfree(newcon);
849 out2:
850 kfree(tcon);
851 out:
852 kfree(scon);
853 return length;
854 }
855
856 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
857 {
858 char *con, *user, *ptr;
859 u32 sid, *sids;
860 ssize_t length;
861 char *newcon;
862 int i, rc;
863 u32 len, nsids;
864
865 length = task_has_security(current, SECURITY__COMPUTE_USER);
866 if (length)
867 return length;
868
869 length = -ENOMEM;
870 con = kzalloc(size + 1, GFP_KERNEL);
871 if (!con)
872 return length;
873
874 user = kzalloc(size + 1, GFP_KERNEL);
875 if (!user)
876 goto out;
877
878 length = -EINVAL;
879 if (sscanf(buf, "%s %s", con, user) != 2)
880 goto out2;
881
882 length = security_context_to_sid(con, strlen(con) + 1, &sid);
883 if (length < 0)
884 goto out2;
885
886 length = security_get_user_sids(sid, user, &sids, &nsids);
887 if (length < 0)
888 goto out2;
889
890 length = sprintf(buf, "%u", nsids) + 1;
891 ptr = buf + length;
892 for (i = 0; i < nsids; i++) {
893 rc = security_sid_to_context(sids[i], &newcon, &len);
894 if (rc) {
895 length = rc;
896 goto out3;
897 }
898 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
899 kfree(newcon);
900 length = -ERANGE;
901 goto out3;
902 }
903 memcpy(ptr, newcon, len);
904 kfree(newcon);
905 ptr += len;
906 length += len;
907 }
908 out3:
909 kfree(sids);
910 out2:
911 kfree(user);
912 out:
913 kfree(con);
914 return length;
915 }
916
917 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
918 {
919 char *scon, *tcon;
920 u32 ssid, tsid, newsid;
921 u16 tclass;
922 ssize_t length;
923 char *newcon;
924 u32 len;
925
926 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
927 if (length)
928 return length;
929
930 length = -ENOMEM;
931 scon = kzalloc(size + 1, GFP_KERNEL);
932 if (!scon)
933 return length;
934
935 tcon = kzalloc(size + 1, GFP_KERNEL);
936 if (!tcon)
937 goto out;
938
939 length = -EINVAL;
940 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
941 goto out2;
942
943 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
944 if (length < 0)
945 goto out2;
946 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
947 if (length < 0)
948 goto out2;
949
950 length = security_member_sid(ssid, tsid, tclass, &newsid);
951 if (length < 0)
952 goto out2;
953
954 length = security_sid_to_context(newsid, &newcon, &len);
955 if (length < 0)
956 goto out2;
957
958 if (len > SIMPLE_TRANSACTION_LIMIT) {
959 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
960 "payload max\n", __func__, len);
961 length = -ERANGE;
962 goto out3;
963 }
964
965 memcpy(buf, newcon, len);
966 length = len;
967 out3:
968 kfree(newcon);
969 out2:
970 kfree(tcon);
971 out:
972 kfree(scon);
973 return length;
974 }
975
976 static struct inode *sel_make_inode(struct super_block *sb, int mode)
977 {
978 struct inode *ret = new_inode(sb);
979
980 if (ret) {
981 ret->i_ino = get_next_ino();
982 ret->i_mode = mode;
983 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
984 }
985 return ret;
986 }
987
988 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
989 size_t count, loff_t *ppos)
990 {
991 char *page = NULL;
992 ssize_t length;
993 ssize_t ret;
994 int cur_enforcing;
995 struct inode *inode = filep->f_path.dentry->d_inode;
996 unsigned index = inode->i_ino & SEL_INO_MASK;
997 const char *name = filep->f_path.dentry->d_name.name;
998
999 mutex_lock(&sel_mutex);
1000
1001 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
1002 ret = -EINVAL;
1003 goto out;
1004 }
1005
1006 page = (char *)get_zeroed_page(GFP_KERNEL);
1007 if (!page) {
1008 ret = -ENOMEM;
1009 goto out;
1010 }
1011
1012 cur_enforcing = security_get_bool_value(index);
1013 if (cur_enforcing < 0) {
1014 ret = cur_enforcing;
1015 goto out;
1016 }
1017 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1018 bool_pending_values[index]);
1019 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1020 out:
1021 mutex_unlock(&sel_mutex);
1022 if (page)
1023 free_page((unsigned long)page);
1024 return ret;
1025 }
1026
1027 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1028 size_t count, loff_t *ppos)
1029 {
1030 char *page = NULL;
1031 ssize_t length;
1032 int new_value;
1033 struct inode *inode = filep->f_path.dentry->d_inode;
1034 unsigned index = inode->i_ino & SEL_INO_MASK;
1035 const char *name = filep->f_path.dentry->d_name.name;
1036
1037 mutex_lock(&sel_mutex);
1038
1039 length = task_has_security(current, SECURITY__SETBOOL);
1040 if (length)
1041 goto out;
1042
1043 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
1044 length = -EINVAL;
1045 goto out;
1046 }
1047
1048 if (count >= PAGE_SIZE) {
1049 length = -ENOMEM;
1050 goto out;
1051 }
1052
1053 if (*ppos != 0) {
1054 /* No partial writes. */
1055 length = -EINVAL;
1056 goto out;
1057 }
1058 page = (char *)get_zeroed_page(GFP_KERNEL);
1059 if (!page) {
1060 length = -ENOMEM;
1061 goto out;
1062 }
1063
1064 length = -EFAULT;
1065 if (copy_from_user(page, buf, count))
1066 goto out;
1067
1068 length = -EINVAL;
1069 if (sscanf(page, "%d", &new_value) != 1)
1070 goto out;
1071
1072 if (new_value)
1073 new_value = 1;
1074
1075 bool_pending_values[index] = new_value;
1076 length = count;
1077
1078 out:
1079 mutex_unlock(&sel_mutex);
1080 if (page)
1081 free_page((unsigned long) page);
1082 return length;
1083 }
1084
1085 static const struct file_operations sel_bool_ops = {
1086 .read = sel_read_bool,
1087 .write = sel_write_bool,
1088 .llseek = generic_file_llseek,
1089 };
1090
1091 static ssize_t sel_commit_bools_write(struct file *filep,
1092 const char __user *buf,
1093 size_t count, loff_t *ppos)
1094 {
1095 char *page = NULL;
1096 ssize_t length;
1097 int new_value;
1098
1099 mutex_lock(&sel_mutex);
1100
1101 length = task_has_security(current, SECURITY__SETBOOL);
1102 if (length)
1103 goto out;
1104
1105 if (count >= PAGE_SIZE) {
1106 length = -ENOMEM;
1107 goto out;
1108 }
1109 if (*ppos != 0) {
1110 /* No partial writes. */
1111 goto out;
1112 }
1113 page = (char *)get_zeroed_page(GFP_KERNEL);
1114 if (!page) {
1115 length = -ENOMEM;
1116 goto out;
1117 }
1118
1119 length = -EFAULT;
1120 if (copy_from_user(page, buf, count))
1121 goto out;
1122
1123 length = -EINVAL;
1124 if (sscanf(page, "%d", &new_value) != 1)
1125 goto out;
1126
1127 if (new_value && bool_pending_values)
1128 security_set_bools(bool_num, bool_pending_values);
1129
1130 length = count;
1131
1132 out:
1133 mutex_unlock(&sel_mutex);
1134 if (page)
1135 free_page((unsigned long) page);
1136 return length;
1137 }
1138
1139 static const struct file_operations sel_commit_bools_ops = {
1140 .write = sel_commit_bools_write,
1141 .llseek = generic_file_llseek,
1142 };
1143
1144 static void sel_remove_entries(struct dentry *de)
1145 {
1146 struct list_head *node;
1147
1148 spin_lock(&de->d_lock);
1149 node = de->d_subdirs.next;
1150 while (node != &de->d_subdirs) {
1151 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1152
1153 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1154 list_del_init(node);
1155
1156 if (d->d_inode) {
1157 dget_dlock(d);
1158 spin_unlock(&de->d_lock);
1159 spin_unlock(&d->d_lock);
1160 d_delete(d);
1161 simple_unlink(de->d_inode, d);
1162 dput(d);
1163 spin_lock(&de->d_lock);
1164 } else
1165 spin_unlock(&d->d_lock);
1166 node = de->d_subdirs.next;
1167 }
1168
1169 spin_unlock(&de->d_lock);
1170 }
1171
1172 #define BOOL_DIR_NAME "booleans"
1173
1174 static int sel_make_bools(void)
1175 {
1176 int i, ret = 0;
1177 ssize_t len;
1178 struct dentry *dentry = NULL;
1179 struct dentry *dir = bool_dir;
1180 struct inode *inode = NULL;
1181 struct inode_security_struct *isec;
1182 char **names = NULL, *page;
1183 int num;
1184 int *values = NULL;
1185 u32 sid;
1186
1187 /* remove any existing files */
1188 for (i = 0; i < bool_num; i++)
1189 kfree(bool_pending_names[i]);
1190 kfree(bool_pending_names);
1191 kfree(bool_pending_values);
1192 bool_pending_names = NULL;
1193 bool_pending_values = NULL;
1194
1195 sel_remove_entries(dir);
1196
1197 page = (char *)get_zeroed_page(GFP_KERNEL);
1198 if (!page)
1199 return -ENOMEM;
1200
1201 ret = security_get_bools(&num, &names, &values);
1202 if (ret != 0)
1203 goto out;
1204
1205 for (i = 0; i < num; i++) {
1206 dentry = d_alloc_name(dir, names[i]);
1207 if (!dentry) {
1208 ret = -ENOMEM;
1209 goto err;
1210 }
1211 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1212 if (!inode) {
1213 ret = -ENOMEM;
1214 goto err;
1215 }
1216
1217 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1218 if (len < 0) {
1219 ret = -EINVAL;
1220 goto err;
1221 } else if (len >= PAGE_SIZE) {
1222 ret = -ENAMETOOLONG;
1223 goto err;
1224 }
1225 isec = (struct inode_security_struct *)inode->i_security;
1226 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1227 if (ret)
1228 goto err;
1229 isec->sid = sid;
1230 isec->initialized = 1;
1231 inode->i_fop = &sel_bool_ops;
1232 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1233 d_add(dentry, inode);
1234 }
1235 bool_num = num;
1236 bool_pending_names = names;
1237 bool_pending_values = values;
1238 out:
1239 free_page((unsigned long)page);
1240 return ret;
1241 err:
1242 if (names) {
1243 for (i = 0; i < num; i++)
1244 kfree(names[i]);
1245 kfree(names);
1246 }
1247 kfree(values);
1248 sel_remove_entries(dir);
1249 ret = -ENOMEM;
1250 goto out;
1251 }
1252
1253 #define NULL_FILE_NAME "null"
1254
1255 struct dentry *selinux_null;
1256
1257 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1258 size_t count, loff_t *ppos)
1259 {
1260 char tmpbuf[TMPBUFLEN];
1261 ssize_t length;
1262
1263 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1264 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1265 }
1266
1267 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1268 const char __user *buf,
1269 size_t count, loff_t *ppos)
1270
1271 {
1272 char *page;
1273 ssize_t ret;
1274 int new_value;
1275
1276 if (count >= PAGE_SIZE) {
1277 ret = -ENOMEM;
1278 goto out;
1279 }
1280
1281 if (*ppos != 0) {
1282 /* No partial writes. */
1283 ret = -EINVAL;
1284 goto out;
1285 }
1286
1287 page = (char *)get_zeroed_page(GFP_KERNEL);
1288 if (!page) {
1289 ret = -ENOMEM;
1290 goto out;
1291 }
1292
1293 if (copy_from_user(page, buf, count)) {
1294 ret = -EFAULT;
1295 goto out_free;
1296 }
1297
1298 if (sscanf(page, "%u", &new_value) != 1) {
1299 ret = -EINVAL;
1300 goto out;
1301 }
1302
1303 if (new_value != avc_cache_threshold) {
1304 ret = task_has_security(current, SECURITY__SETSECPARAM);
1305 if (ret)
1306 goto out_free;
1307 avc_cache_threshold = new_value;
1308 }
1309 ret = count;
1310 out_free:
1311 free_page((unsigned long)page);
1312 out:
1313 return ret;
1314 }
1315
1316 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1317 size_t count, loff_t *ppos)
1318 {
1319 char *page;
1320 ssize_t ret = 0;
1321
1322 page = (char *)__get_free_page(GFP_KERNEL);
1323 if (!page) {
1324 ret = -ENOMEM;
1325 goto out;
1326 }
1327 ret = avc_get_hash_stats(page);
1328 if (ret >= 0)
1329 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1330 free_page((unsigned long)page);
1331 out:
1332 return ret;
1333 }
1334
1335 static const struct file_operations sel_avc_cache_threshold_ops = {
1336 .read = sel_read_avc_cache_threshold,
1337 .write = sel_write_avc_cache_threshold,
1338 .llseek = generic_file_llseek,
1339 };
1340
1341 static const struct file_operations sel_avc_hash_stats_ops = {
1342 .read = sel_read_avc_hash_stats,
1343 .llseek = generic_file_llseek,
1344 };
1345
1346 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1347 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1348 {
1349 int cpu;
1350
1351 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1352 if (!cpu_possible(cpu))
1353 continue;
1354 *idx = cpu + 1;
1355 return &per_cpu(avc_cache_stats, cpu);
1356 }
1357 return NULL;
1358 }
1359
1360 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1361 {
1362 loff_t n = *pos - 1;
1363
1364 if (*pos == 0)
1365 return SEQ_START_TOKEN;
1366
1367 return sel_avc_get_stat_idx(&n);
1368 }
1369
1370 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1371 {
1372 return sel_avc_get_stat_idx(pos);
1373 }
1374
1375 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1376 {
1377 struct avc_cache_stats *st = v;
1378
1379 if (v == SEQ_START_TOKEN)
1380 seq_printf(seq, "lookups hits misses allocations reclaims "
1381 "frees\n");
1382 else
1383 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1384 st->hits, st->misses, st->allocations,
1385 st->reclaims, st->frees);
1386 return 0;
1387 }
1388
1389 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1390 { }
1391
1392 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1393 .start = sel_avc_stats_seq_start,
1394 .next = sel_avc_stats_seq_next,
1395 .show = sel_avc_stats_seq_show,
1396 .stop = sel_avc_stats_seq_stop,
1397 };
1398
1399 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1400 {
1401 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1402 }
1403
1404 static const struct file_operations sel_avc_cache_stats_ops = {
1405 .open = sel_open_avc_cache_stats,
1406 .read = seq_read,
1407 .llseek = seq_lseek,
1408 .release = seq_release,
1409 };
1410 #endif
1411
1412 static int sel_make_avc_files(struct dentry *dir)
1413 {
1414 int i, ret = 0;
1415 static struct tree_descr files[] = {
1416 { "cache_threshold",
1417 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1418 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1419 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1420 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1421 #endif
1422 };
1423
1424 for (i = 0; i < ARRAY_SIZE(files); i++) {
1425 struct inode *inode;
1426 struct dentry *dentry;
1427
1428 dentry = d_alloc_name(dir, files[i].name);
1429 if (!dentry) {
1430 ret = -ENOMEM;
1431 goto out;
1432 }
1433
1434 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1435 if (!inode) {
1436 ret = -ENOMEM;
1437 goto out;
1438 }
1439 inode->i_fop = files[i].ops;
1440 inode->i_ino = ++sel_last_ino;
1441 d_add(dentry, inode);
1442 }
1443 out:
1444 return ret;
1445 }
1446
1447 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1448 size_t count, loff_t *ppos)
1449 {
1450 struct inode *inode;
1451 char *con;
1452 u32 sid, len;
1453 ssize_t ret;
1454
1455 inode = file->f_path.dentry->d_inode;
1456 sid = inode->i_ino&SEL_INO_MASK;
1457 ret = security_sid_to_context(sid, &con, &len);
1458 if (ret < 0)
1459 return ret;
1460
1461 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1462 kfree(con);
1463 return ret;
1464 }
1465
1466 static const struct file_operations sel_initcon_ops = {
1467 .read = sel_read_initcon,
1468 .llseek = generic_file_llseek,
1469 };
1470
1471 static int sel_make_initcon_files(struct dentry *dir)
1472 {
1473 int i, ret = 0;
1474
1475 for (i = 1; i <= SECINITSID_NUM; i++) {
1476 struct inode *inode;
1477 struct dentry *dentry;
1478 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1479 if (!dentry) {
1480 ret = -ENOMEM;
1481 goto out;
1482 }
1483
1484 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1485 if (!inode) {
1486 ret = -ENOMEM;
1487 goto out;
1488 }
1489 inode->i_fop = &sel_initcon_ops;
1490 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1491 d_add(dentry, inode);
1492 }
1493 out:
1494 return ret;
1495 }
1496
1497 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1498 {
1499 return a / b - (a % b < 0);
1500 }
1501
1502 static inline unsigned long sel_class_to_ino(u16 class)
1503 {
1504 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1505 }
1506
1507 static inline u16 sel_ino_to_class(unsigned long ino)
1508 {
1509 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1510 }
1511
1512 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1513 {
1514 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1515 }
1516
1517 static inline u32 sel_ino_to_perm(unsigned long ino)
1518 {
1519 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1520 }
1521
1522 static ssize_t sel_read_class(struct file *file, char __user *buf,
1523 size_t count, loff_t *ppos)
1524 {
1525 ssize_t rc, len;
1526 char *page;
1527 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1528
1529 page = (char *)__get_free_page(GFP_KERNEL);
1530 if (!page) {
1531 rc = -ENOMEM;
1532 goto out;
1533 }
1534
1535 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1536 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1537 free_page((unsigned long)page);
1538 out:
1539 return rc;
1540 }
1541
1542 static const struct file_operations sel_class_ops = {
1543 .read = sel_read_class,
1544 .llseek = generic_file_llseek,
1545 };
1546
1547 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1548 size_t count, loff_t *ppos)
1549 {
1550 ssize_t rc, len;
1551 char *page;
1552 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1553
1554 page = (char *)__get_free_page(GFP_KERNEL);
1555 if (!page) {
1556 rc = -ENOMEM;
1557 goto out;
1558 }
1559
1560 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1561 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1562 free_page((unsigned long)page);
1563 out:
1564 return rc;
1565 }
1566
1567 static const struct file_operations sel_perm_ops = {
1568 .read = sel_read_perm,
1569 .llseek = generic_file_llseek,
1570 };
1571
1572 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1573 size_t count, loff_t *ppos)
1574 {
1575 int value;
1576 char tmpbuf[TMPBUFLEN];
1577 ssize_t length;
1578 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1579
1580 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1581 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1582
1583 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1584 }
1585
1586 static const struct file_operations sel_policycap_ops = {
1587 .read = sel_read_policycap,
1588 .llseek = generic_file_llseek,
1589 };
1590
1591 static int sel_make_perm_files(char *objclass, int classvalue,
1592 struct dentry *dir)
1593 {
1594 int i, rc = 0, nperms;
1595 char **perms;
1596
1597 rc = security_get_permissions(objclass, &perms, &nperms);
1598 if (rc)
1599 goto out;
1600
1601 for (i = 0; i < nperms; i++) {
1602 struct inode *inode;
1603 struct dentry *dentry;
1604
1605 dentry = d_alloc_name(dir, perms[i]);
1606 if (!dentry) {
1607 rc = -ENOMEM;
1608 goto out1;
1609 }
1610
1611 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1612 if (!inode) {
1613 rc = -ENOMEM;
1614 goto out1;
1615 }
1616 inode->i_fop = &sel_perm_ops;
1617 /* i+1 since perm values are 1-indexed */
1618 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1619 d_add(dentry, inode);
1620 }
1621
1622 out1:
1623 for (i = 0; i < nperms; i++)
1624 kfree(perms[i]);
1625 kfree(perms);
1626 out:
1627 return rc;
1628 }
1629
1630 static int sel_make_class_dir_entries(char *classname, int index,
1631 struct dentry *dir)
1632 {
1633 struct dentry *dentry = NULL;
1634 struct inode *inode = NULL;
1635 int rc;
1636
1637 dentry = d_alloc_name(dir, "index");
1638 if (!dentry) {
1639 rc = -ENOMEM;
1640 goto out;
1641 }
1642
1643 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1644 if (!inode) {
1645 rc = -ENOMEM;
1646 goto out;
1647 }
1648
1649 inode->i_fop = &sel_class_ops;
1650 inode->i_ino = sel_class_to_ino(index);
1651 d_add(dentry, inode);
1652
1653 dentry = d_alloc_name(dir, "perms");
1654 if (!dentry) {
1655 rc = -ENOMEM;
1656 goto out;
1657 }
1658
1659 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1660 if (rc)
1661 goto out;
1662
1663 rc = sel_make_perm_files(classname, index, dentry);
1664
1665 out:
1666 return rc;
1667 }
1668
1669 static void sel_remove_classes(void)
1670 {
1671 struct list_head *class_node;
1672
1673 list_for_each(class_node, &class_dir->d_subdirs) {
1674 struct dentry *class_subdir = list_entry(class_node,
1675 struct dentry, d_u.d_child);
1676 struct list_head *class_subdir_node;
1677
1678 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1679 struct dentry *d = list_entry(class_subdir_node,
1680 struct dentry, d_u.d_child);
1681
1682 if (d->d_inode)
1683 if (d->d_inode->i_mode & S_IFDIR)
1684 sel_remove_entries(d);
1685 }
1686
1687 sel_remove_entries(class_subdir);
1688 }
1689
1690 sel_remove_entries(class_dir);
1691 }
1692
1693 static int sel_make_classes(void)
1694 {
1695 int rc = 0, nclasses, i;
1696 char **classes;
1697
1698 /* delete any existing entries */
1699 sel_remove_classes();
1700
1701 rc = security_get_classes(&classes, &nclasses);
1702 if (rc < 0)
1703 goto out;
1704
1705 /* +2 since classes are 1-indexed */
1706 last_class_ino = sel_class_to_ino(nclasses + 2);
1707
1708 for (i = 0; i < nclasses; i++) {
1709 struct dentry *class_name_dir;
1710
1711 class_name_dir = d_alloc_name(class_dir, classes[i]);
1712 if (!class_name_dir) {
1713 rc = -ENOMEM;
1714 goto out1;
1715 }
1716
1717 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1718 &last_class_ino);
1719 if (rc)
1720 goto out1;
1721
1722 /* i+1 since class values are 1-indexed */
1723 rc = sel_make_class_dir_entries(classes[i], i + 1,
1724 class_name_dir);
1725 if (rc)
1726 goto out1;
1727 }
1728
1729 out1:
1730 for (i = 0; i < nclasses; i++)
1731 kfree(classes[i]);
1732 kfree(classes);
1733 out:
1734 return rc;
1735 }
1736
1737 static int sel_make_policycap(void)
1738 {
1739 unsigned int iter;
1740 struct dentry *dentry = NULL;
1741 struct inode *inode = NULL;
1742
1743 sel_remove_entries(policycap_dir);
1744
1745 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1746 if (iter < ARRAY_SIZE(policycap_names))
1747 dentry = d_alloc_name(policycap_dir,
1748 policycap_names[iter]);
1749 else
1750 dentry = d_alloc_name(policycap_dir, "unknown");
1751
1752 if (dentry == NULL)
1753 return -ENOMEM;
1754
1755 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1756 if (inode == NULL)
1757 return -ENOMEM;
1758
1759 inode->i_fop = &sel_policycap_ops;
1760 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1761 d_add(dentry, inode);
1762 }
1763
1764 return 0;
1765 }
1766
1767 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1768 unsigned long *ino)
1769 {
1770 int ret = 0;
1771 struct inode *inode;
1772
1773 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1774 if (!inode) {
1775 ret = -ENOMEM;
1776 goto out;
1777 }
1778 inode->i_op = &simple_dir_inode_operations;
1779 inode->i_fop = &simple_dir_operations;
1780 inode->i_ino = ++(*ino);
1781 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1782 inc_nlink(inode);
1783 d_add(dentry, inode);
1784 /* bump link count on parent directory, too */
1785 inc_nlink(dir);
1786 out:
1787 return ret;
1788 }
1789
1790 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1791 {
1792 int ret;
1793 struct dentry *dentry;
1794 struct inode *inode, *root_inode;
1795 struct inode_security_struct *isec;
1796
1797 static struct tree_descr selinux_files[] = {
1798 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1799 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1800 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1801 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1802 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1804 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1805 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1806 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1807 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1808 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1809 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1810 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1811 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1812 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1813 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1814 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1815 /* last one */ {""}
1816 };
1817 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1818 if (ret)
1819 goto err;
1820
1821 root_inode = sb->s_root->d_inode;
1822
1823 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1824 if (!dentry) {
1825 ret = -ENOMEM;
1826 goto err;
1827 }
1828
1829 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1830 if (ret)
1831 goto err;
1832
1833 bool_dir = dentry;
1834
1835 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1836 if (!dentry) {
1837 ret = -ENOMEM;
1838 goto err;
1839 }
1840
1841 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1842 if (!inode) {
1843 ret = -ENOMEM;
1844 goto err;
1845 }
1846 inode->i_ino = ++sel_last_ino;
1847 isec = (struct inode_security_struct *)inode->i_security;
1848 isec->sid = SECINITSID_DEVNULL;
1849 isec->sclass = SECCLASS_CHR_FILE;
1850 isec->initialized = 1;
1851
1852 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1853 d_add(dentry, inode);
1854 selinux_null = dentry;
1855
1856 dentry = d_alloc_name(sb->s_root, "avc");
1857 if (!dentry) {
1858 ret = -ENOMEM;
1859 goto err;
1860 }
1861
1862 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1863 if (ret)
1864 goto err;
1865
1866 ret = sel_make_avc_files(dentry);
1867 if (ret)
1868 goto err;
1869
1870 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1871 if (!dentry) {
1872 ret = -ENOMEM;
1873 goto err;
1874 }
1875
1876 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1877 if (ret)
1878 goto err;
1879
1880 ret = sel_make_initcon_files(dentry);
1881 if (ret)
1882 goto err;
1883
1884 dentry = d_alloc_name(sb->s_root, "class");
1885 if (!dentry) {
1886 ret = -ENOMEM;
1887 goto err;
1888 }
1889
1890 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1891 if (ret)
1892 goto err;
1893
1894 class_dir = dentry;
1895
1896 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1897 if (!dentry) {
1898 ret = -ENOMEM;
1899 goto err;
1900 }
1901
1902 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1903 if (ret)
1904 goto err;
1905
1906 policycap_dir = dentry;
1907
1908 out:
1909 return ret;
1910 err:
1911 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1912 __func__);
1913 goto out;
1914 }
1915
1916 static struct dentry *sel_mount(struct file_system_type *fs_type,
1917 int flags, const char *dev_name, void *data)
1918 {
1919 return mount_single(fs_type, flags, data, sel_fill_super);
1920 }
1921
1922 static struct file_system_type sel_fs_type = {
1923 .name = "selinuxfs",
1924 .mount = sel_mount,
1925 .kill_sb = kill_litter_super,
1926 };
1927
1928 struct vfsmount *selinuxfs_mount;
1929
1930 static int __init init_sel_fs(void)
1931 {
1932 int err;
1933
1934 if (!selinux_enabled)
1935 return 0;
1936 err = register_filesystem(&sel_fs_type);
1937 if (!err) {
1938 selinuxfs_mount = kern_mount(&sel_fs_type);
1939 if (IS_ERR(selinuxfs_mount)) {
1940 printk(KERN_ERR "selinuxfs: could not mount!\n");
1941 err = PTR_ERR(selinuxfs_mount);
1942 selinuxfs_mount = NULL;
1943 }
1944 }
1945 return err;
1946 }
1947
1948 __initcall(init_sel_fs);
1949
1950 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1951 void exit_sel_fs(void)
1952 {
1953 unregister_filesystem(&sel_fs_type);
1954 }
1955 #endif
Linux kernel - Deliverables
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