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Linux 4.19.133
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blobf3a5a138a096d8cb7d1d42cd23e07eecbbd4a2a0
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/mount.h>
23 #include <linux/mutex.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/security.h>
27 #include <linux/major.h>
28 #include <linux/seq_file.h>
29 #include <linux/percpu.h>
30 #include <linux/audit.h>
31 #include <linux/uaccess.h>
32 #include <linux/kobject.h>
33 #include <linux/ctype.h>
34
35 /* selinuxfs pseudo filesystem for exporting the security policy API.
36 Based on the proc code and the fs/nfsd/nfsctl.c code. */
37
38 #include "flask.h"
39 #include "avc.h"
40 #include "avc_ss.h"
41 #include "security.h"
42 #include "objsec.h"
43 #include "conditional.h"
44
45 enum sel_inos {
46 SEL_ROOT_INO = 2,
47 SEL_LOAD, /* load policy */
48 SEL_ENFORCE, /* get or set enforcing status */
49 SEL_CONTEXT, /* validate context */
50 SEL_ACCESS, /* compute access decision */
51 SEL_CREATE, /* compute create labeling decision */
52 SEL_RELABEL, /* compute relabeling decision */
53 SEL_USER, /* compute reachable user contexts */
54 SEL_POLICYVERS, /* return policy version for this kernel */
55 SEL_COMMIT_BOOLS, /* commit new boolean values */
56 SEL_MLS, /* return if MLS policy is enabled */
57 SEL_DISABLE, /* disable SELinux until next reboot */
58 SEL_MEMBER, /* compute polyinstantiation membership decision */
59 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
60 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
61 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
62 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
63 SEL_STATUS, /* export current status using mmap() */
64 SEL_POLICY, /* allow userspace to read the in kernel policy */
65 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
66 SEL_INO_NEXT, /* The next inode number to use */
67 };
68
69 struct selinux_fs_info {
70 struct dentry *bool_dir;
71 unsigned int bool_num;
72 char **bool_pending_names;
73 unsigned int *bool_pending_values;
74 struct dentry *class_dir;
75 unsigned long last_class_ino;
76 bool policy_opened;
77 struct dentry *policycap_dir;
78 struct mutex mutex;
79 unsigned long last_ino;
80 struct selinux_state *state;
81 struct super_block *sb;
82 };
83
84 static int selinux_fs_info_create(struct super_block *sb)
85 {
86 struct selinux_fs_info *fsi;
87
88 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
89 if (!fsi)
90 return -ENOMEM;
91
92 mutex_init(&fsi->mutex);
93 fsi->last_ino = SEL_INO_NEXT - 1;
94 fsi->state = &selinux_state;
95 fsi->sb = sb;
96 sb->s_fs_info = fsi;
97 return 0;
98 }
99
100 static void selinux_fs_info_free(struct super_block *sb)
101 {
102 struct selinux_fs_info *fsi = sb->s_fs_info;
103 int i;
104
105 if (fsi) {
106 for (i = 0; i < fsi->bool_num; i++)
107 kfree(fsi->bool_pending_names[i]);
108 kfree(fsi->bool_pending_names);
109 kfree(fsi->bool_pending_values);
110 }
111 kfree(sb->s_fs_info);
112 sb->s_fs_info = NULL;
113 }
114
115 #define SEL_INITCON_INO_OFFSET 0x01000000
116 #define SEL_BOOL_INO_OFFSET 0x02000000
117 #define SEL_CLASS_INO_OFFSET 0x04000000
118 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
119 #define SEL_INO_MASK 0x00ffffff
120
121 #define TMPBUFLEN 12
122 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
123 size_t count, loff_t *ppos)
124 {
125 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
126 char tmpbuf[TMPBUFLEN];
127 ssize_t length;
128
129 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
130 enforcing_enabled(fsi->state));
131 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
132 }
133
134 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
135 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
136 size_t count, loff_t *ppos)
137
138 {
139 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
140 struct selinux_state *state = fsi->state;
141 char *page = NULL;
142 ssize_t length;
143 int old_value, new_value;
144
145 if (count >= PAGE_SIZE)
146 return -ENOMEM;
147
148 /* No partial writes. */
149 if (*ppos != 0)
150 return -EINVAL;
151
152 page = memdup_user_nul(buf, count);
153 if (IS_ERR(page))
154 return PTR_ERR(page);
155
156 length = -EINVAL;
157 if (sscanf(page, "%d", &new_value) != 1)
158 goto out;
159
160 new_value = !!new_value;
161
162 old_value = enforcing_enabled(state);
163 if (new_value != old_value) {
164 length = avc_has_perm(&selinux_state,
165 current_sid(), SECINITSID_SECURITY,
166 SECCLASS_SECURITY, SECURITY__SETENFORCE,
167 NULL);
168 if (length)
169 goto out;
170 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
171 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
172 " enabled=%d old-enabled=%d lsm=selinux res=1",
173 new_value, old_value,
174 from_kuid(&init_user_ns, audit_get_loginuid(current)),
175 audit_get_sessionid(current),
176 selinux_enabled, selinux_enabled);
177 enforcing_set(state, new_value);
178 if (new_value)
179 avc_ss_reset(state->avc, 0);
180 selnl_notify_setenforce(new_value);
181 selinux_status_update_setenforce(state, new_value);
182 if (!new_value)
183 call_lsm_notifier(LSM_POLICY_CHANGE, NULL);
184 }
185 length = count;
186 out:
187 kfree(page);
188 return length;
189 }
190 #else
191 #define sel_write_enforce NULL
192 #endif
193
194 static const struct file_operations sel_enforce_ops = {
195 .read = sel_read_enforce,
196 .write = sel_write_enforce,
197 .llseek = generic_file_llseek,
198 };
199
200 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
201 size_t count, loff_t *ppos)
202 {
203 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
204 struct selinux_state *state = fsi->state;
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(state) :
210 !security_get_allow_unknown(state);
211
212 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
213 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
214 }
215
216 static const struct file_operations sel_handle_unknown_ops = {
217 .read = sel_read_handle_unknown,
218 .llseek = generic_file_llseek,
219 };
220
221 static int sel_open_handle_status(struct inode *inode, struct file *filp)
222 {
223 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
224 struct page *status = selinux_kernel_status_page(fsi->state);
225
226 if (!status)
227 return -ENOMEM;
228
229 filp->private_data = status;
230
231 return 0;
232 }
233
234 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
235 size_t count, loff_t *ppos)
236 {
237 struct page *status = filp->private_data;
238
239 BUG_ON(!status);
240
241 return simple_read_from_buffer(buf, count, ppos,
242 page_address(status),
243 sizeof(struct selinux_kernel_status));
244 }
245
246 static int sel_mmap_handle_status(struct file *filp,
247 struct vm_area_struct *vma)
248 {
249 struct page *status = filp->private_data;
250 unsigned long size = vma->vm_end - vma->vm_start;
251
252 BUG_ON(!status);
253
254 /* only allows one page from the head */
255 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
256 return -EIO;
257 /* disallow writable mapping */
258 if (vma->vm_flags & VM_WRITE)
259 return -EPERM;
260 /* disallow mprotect() turns it into writable */
261 vma->vm_flags &= ~VM_MAYWRITE;
262
263 return remap_pfn_range(vma, vma->vm_start,
264 page_to_pfn(status),
265 size, vma->vm_page_prot);
266 }
267
268 static const struct file_operations sel_handle_status_ops = {
269 .open = sel_open_handle_status,
270 .read = sel_read_handle_status,
271 .mmap = sel_mmap_handle_status,
272 .llseek = generic_file_llseek,
273 };
274
275 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
276 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
277 size_t count, loff_t *ppos)
278
279 {
280 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
281 char *page;
282 ssize_t length;
283 int new_value;
284 int enforcing;
285
286 if (count >= PAGE_SIZE)
287 return -ENOMEM;
288
289 /* No partial writes. */
290 if (*ppos != 0)
291 return -EINVAL;
292
293 page = memdup_user_nul(buf, count);
294 if (IS_ERR(page))
295 return PTR_ERR(page);
296
297 length = -EINVAL;
298 if (sscanf(page, "%d", &new_value) != 1)
299 goto out;
300
301 if (new_value) {
302 enforcing = enforcing_enabled(fsi->state);
303 length = selinux_disable(fsi->state);
304 if (length)
305 goto out;
306 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
307 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
308 " enabled=%d old-enabled=%d lsm=selinux res=1",
309 enforcing, enforcing,
310 from_kuid(&init_user_ns, audit_get_loginuid(current)),
311 audit_get_sessionid(current), 0, 1);
312 }
313
314 length = count;
315 out:
316 kfree(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(struct selinux_fs_info *fsi);
345 static int sel_make_classes(struct selinux_fs_info *fsi);
346 static int sel_make_policycap(struct selinux_fs_info *fsi);
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 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
356 char tmpbuf[TMPBUFLEN];
357 ssize_t length;
358
359 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
360 security_mls_enabled(fsi->state));
361 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
362 }
363
364 static const struct file_operations sel_mls_ops = {
365 .read = sel_read_mls,
366 .llseek = generic_file_llseek,
367 };
368
369 struct policy_load_memory {
370 size_t len;
371 void *data;
372 };
373
374 static int sel_open_policy(struct inode *inode, struct file *filp)
375 {
376 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
377 struct selinux_state *state = fsi->state;
378 struct policy_load_memory *plm = NULL;
379 int rc;
380
381 BUG_ON(filp->private_data);
382
383 mutex_lock(&fsi->mutex);
384
385 rc = avc_has_perm(&selinux_state,
386 current_sid(), SECINITSID_SECURITY,
387 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
388 if (rc)
389 goto err;
390
391 rc = -EBUSY;
392 if (fsi->policy_opened)
393 goto err;
394
395 rc = -ENOMEM;
396 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
397 if (!plm)
398 goto err;
399
400 if (i_size_read(inode) != security_policydb_len(state)) {
401 inode_lock(inode);
402 i_size_write(inode, security_policydb_len(state));
403 inode_unlock(inode);
404 }
405
406 rc = security_read_policy(state, &plm->data, &plm->len);
407 if (rc)
408 goto err;
409
410 fsi->policy_opened = 1;
411
412 filp->private_data = plm;
413
414 mutex_unlock(&fsi->mutex);
415
416 return 0;
417 err:
418 mutex_unlock(&fsi->mutex);
419
420 if (plm)
421 vfree(plm->data);
422 kfree(plm);
423 return rc;
424 }
425
426 static int sel_release_policy(struct inode *inode, struct file *filp)
427 {
428 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
429 struct policy_load_memory *plm = filp->private_data;
430
431 BUG_ON(!plm);
432
433 fsi->policy_opened = 0;
434
435 vfree(plm->data);
436 kfree(plm);
437
438 return 0;
439 }
440
441 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
442 size_t count, loff_t *ppos)
443 {
444 struct policy_load_memory *plm = filp->private_data;
445 int ret;
446
447 ret = avc_has_perm(&selinux_state,
448 current_sid(), SECINITSID_SECURITY,
449 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
450 if (ret)
451 return ret;
452
453 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
454 }
455
456 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
457 {
458 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
459 unsigned long offset;
460 struct page *page;
461
462 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
463 return VM_FAULT_SIGBUS;
464
465 offset = vmf->pgoff << PAGE_SHIFT;
466 if (offset >= roundup(plm->len, PAGE_SIZE))
467 return VM_FAULT_SIGBUS;
468
469 page = vmalloc_to_page(plm->data + offset);
470 get_page(page);
471
472 vmf->page = page;
473
474 return 0;
475 }
476
477 static const struct vm_operations_struct sel_mmap_policy_ops = {
478 .fault = sel_mmap_policy_fault,
479 .page_mkwrite = sel_mmap_policy_fault,
480 };
481
482 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
483 {
484 if (vma->vm_flags & VM_SHARED) {
485 /* do not allow mprotect to make mapping writable */
486 vma->vm_flags &= ~VM_MAYWRITE;
487
488 if (vma->vm_flags & VM_WRITE)
489 return -EACCES;
490 }
491
492 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
493 vma->vm_ops = &sel_mmap_policy_ops;
494
495 return 0;
496 }
497
498 static const struct file_operations sel_policy_ops = {
499 .open = sel_open_policy,
500 .read = sel_read_policy,
501 .mmap = sel_mmap_policy,
502 .release = sel_release_policy,
503 .llseek = generic_file_llseek,
504 };
505
506 static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
507 {
508 int ret;
509
510 ret = sel_make_bools(fsi);
511 if (ret) {
512 pr_err("SELinux: failed to load policy booleans\n");
513 return ret;
514 }
515
516 ret = sel_make_classes(fsi);
517 if (ret) {
518 pr_err("SELinux: failed to load policy classes\n");
519 return ret;
520 }
521
522 ret = sel_make_policycap(fsi);
523 if (ret) {
524 pr_err("SELinux: failed to load policy capabilities\n");
525 return ret;
526 }
527
528 return 0;
529 }
530
531 static ssize_t sel_write_load(struct file *file, const char __user *buf,
532 size_t count, loff_t *ppos)
533
534 {
535 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
536 ssize_t length;
537 void *data = NULL;
538
539 mutex_lock(&fsi->mutex);
540
541 length = avc_has_perm(&selinux_state,
542 current_sid(), SECINITSID_SECURITY,
543 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
544 if (length)
545 goto out;
546
547 /* No partial writes. */
548 length = -EINVAL;
549 if (*ppos != 0)
550 goto out;
551
552 length = -EFBIG;
553 if (count > 64 * 1024 * 1024)
554 goto out;
555
556 length = -ENOMEM;
557 data = vmalloc(count);
558 if (!data)
559 goto out;
560
561 length = -EFAULT;
562 if (copy_from_user(data, buf, count) != 0)
563 goto out;
564
565 length = security_load_policy(fsi->state, data, count);
566 if (length) {
567 pr_warn_ratelimited("SELinux: failed to load policy\n");
568 goto out;
569 }
570
571 length = sel_make_policy_nodes(fsi);
572 if (length)
573 goto out1;
574
575 length = count;
576
577 out1:
578 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
579 "auid=%u ses=%u lsm=selinux res=1",
580 from_kuid(&init_user_ns, audit_get_loginuid(current)),
581 audit_get_sessionid(current));
582 out:
583 mutex_unlock(&fsi->mutex);
584 vfree(data);
585 return length;
586 }
587
588 static const struct file_operations sel_load_ops = {
589 .write = sel_write_load,
590 .llseek = generic_file_llseek,
591 };
592
593 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
594 {
595 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
596 struct selinux_state *state = fsi->state;
597 char *canon = NULL;
598 u32 sid, len;
599 ssize_t length;
600
601 length = avc_has_perm(&selinux_state,
602 current_sid(), SECINITSID_SECURITY,
603 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
604 if (length)
605 goto out;
606
607 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
608 if (length)
609 goto out;
610
611 length = security_sid_to_context(state, sid, &canon, &len);
612 if (length)
613 goto out;
614
615 length = -ERANGE;
616 if (len > SIMPLE_TRANSACTION_LIMIT) {
617 pr_err("SELinux: %s: context size (%u) exceeds "
618 "payload max\n", __func__, len);
619 goto out;
620 }
621
622 memcpy(buf, canon, len);
623 length = len;
624 out:
625 kfree(canon);
626 return length;
627 }
628
629 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
630 size_t count, loff_t *ppos)
631 {
632 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
633 char tmpbuf[TMPBUFLEN];
634 ssize_t length;
635
636 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
637 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
638 }
639
640 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
641 size_t count, loff_t *ppos)
642 {
643 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
644 char *page;
645 ssize_t length;
646 unsigned int new_value;
647
648 length = avc_has_perm(&selinux_state,
649 current_sid(), SECINITSID_SECURITY,
650 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
651 NULL);
652 if (length)
653 return length;
654
655 if (count >= PAGE_SIZE)
656 return -ENOMEM;
657
658 /* No partial writes. */
659 if (*ppos != 0)
660 return -EINVAL;
661
662 page = memdup_user_nul(buf, count);
663 if (IS_ERR(page))
664 return PTR_ERR(page);
665
666 length = -EINVAL;
667 if (sscanf(page, "%u", &new_value) != 1)
668 goto out;
669
670 fsi->state->checkreqprot = new_value ? 1 : 0;
671 length = count;
672 out:
673 kfree(page);
674 return length;
675 }
676 static const struct file_operations sel_checkreqprot_ops = {
677 .read = sel_read_checkreqprot,
678 .write = sel_write_checkreqprot,
679 .llseek = generic_file_llseek,
680 };
681
682 static ssize_t sel_write_validatetrans(struct file *file,
683 const char __user *buf,
684 size_t count, loff_t *ppos)
685 {
686 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
687 struct selinux_state *state = fsi->state;
688 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
689 char *req = NULL;
690 u32 osid, nsid, tsid;
691 u16 tclass;
692 int rc;
693
694 rc = avc_has_perm(&selinux_state,
695 current_sid(), SECINITSID_SECURITY,
696 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
697 if (rc)
698 goto out;
699
700 rc = -ENOMEM;
701 if (count >= PAGE_SIZE)
702 goto out;
703
704 /* No partial writes. */
705 rc = -EINVAL;
706 if (*ppos != 0)
707 goto out;
708
709 req = memdup_user_nul(buf, count);
710 if (IS_ERR(req)) {
711 rc = PTR_ERR(req);
712 req = NULL;
713 goto out;
714 }
715
716 rc = -ENOMEM;
717 oldcon = kzalloc(count + 1, GFP_KERNEL);
718 if (!oldcon)
719 goto out;
720
721 newcon = kzalloc(count + 1, GFP_KERNEL);
722 if (!newcon)
723 goto out;
724
725 taskcon = kzalloc(count + 1, GFP_KERNEL);
726 if (!taskcon)
727 goto out;
728
729 rc = -EINVAL;
730 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
731 goto out;
732
733 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
734 if (rc)
735 goto out;
736
737 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
738 if (rc)
739 goto out;
740
741 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
742 if (rc)
743 goto out;
744
745 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
746 if (!rc)
747 rc = count;
748 out:
749 kfree(req);
750 kfree(oldcon);
751 kfree(newcon);
752 kfree(taskcon);
753 return rc;
754 }
755
756 static const struct file_operations sel_transition_ops = {
757 .write = sel_write_validatetrans,
758 .llseek = generic_file_llseek,
759 };
760
761 /*
762 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
763 */
764 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
765 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
766 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
767 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
768 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
769
770 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
771 [SEL_ACCESS] = sel_write_access,
772 [SEL_CREATE] = sel_write_create,
773 [SEL_RELABEL] = sel_write_relabel,
774 [SEL_USER] = sel_write_user,
775 [SEL_MEMBER] = sel_write_member,
776 [SEL_CONTEXT] = sel_write_context,
777 };
778
779 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
780 {
781 ino_t ino = file_inode(file)->i_ino;
782 char *data;
783 ssize_t rv;
784
785 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
786 return -EINVAL;
787
788 data = simple_transaction_get(file, buf, size);
789 if (IS_ERR(data))
790 return PTR_ERR(data);
791
792 rv = write_op[ino](file, data, size);
793 if (rv > 0) {
794 simple_transaction_set(file, rv);
795 rv = size;
796 }
797 return rv;
798 }
799
800 static const struct file_operations transaction_ops = {
801 .write = selinux_transaction_write,
802 .read = simple_transaction_read,
803 .release = simple_transaction_release,
804 .llseek = generic_file_llseek,
805 };
806
807 /*
808 * payload - write methods
809 * If the method has a response, the response should be put in buf,
810 * and the length returned. Otherwise return 0 or and -error.
811 */
812
813 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
814 {
815 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
816 struct selinux_state *state = fsi->state;
817 char *scon = NULL, *tcon = NULL;
818 u32 ssid, tsid;
819 u16 tclass;
820 struct av_decision avd;
821 ssize_t length;
822
823 length = avc_has_perm(&selinux_state,
824 current_sid(), SECINITSID_SECURITY,
825 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
826 if (length)
827 goto out;
828
829 length = -ENOMEM;
830 scon = kzalloc(size + 1, GFP_KERNEL);
831 if (!scon)
832 goto out;
833
834 length = -ENOMEM;
835 tcon = kzalloc(size + 1, GFP_KERNEL);
836 if (!tcon)
837 goto out;
838
839 length = -EINVAL;
840 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
841 goto out;
842
843 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
844 if (length)
845 goto out;
846
847 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
848 if (length)
849 goto out;
850
851 security_compute_av_user(state, ssid, tsid, tclass, &avd);
852
853 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
854 "%x %x %x %x %u %x",
855 avd.allowed, 0xffffffff,
856 avd.auditallow, avd.auditdeny,
857 avd.seqno, avd.flags);
858 out:
859 kfree(tcon);
860 kfree(scon);
861 return length;
862 }
863
864 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
865 {
866 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
867 struct selinux_state *state = fsi->state;
868 char *scon = NULL, *tcon = NULL;
869 char *namebuf = NULL, *objname = NULL;
870 u32 ssid, tsid, newsid;
871 u16 tclass;
872 ssize_t length;
873 char *newcon = NULL;
874 u32 len;
875 int nargs;
876
877 length = avc_has_perm(&selinux_state,
878 current_sid(), SECINITSID_SECURITY,
879 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
880 NULL);
881 if (length)
882 goto out;
883
884 length = -ENOMEM;
885 scon = kzalloc(size + 1, GFP_KERNEL);
886 if (!scon)
887 goto out;
888
889 length = -ENOMEM;
890 tcon = kzalloc(size + 1, GFP_KERNEL);
891 if (!tcon)
892 goto out;
893
894 length = -ENOMEM;
895 namebuf = kzalloc(size + 1, GFP_KERNEL);
896 if (!namebuf)
897 goto out;
898
899 length = -EINVAL;
900 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
901 if (nargs < 3 || nargs > 4)
902 goto out;
903 if (nargs == 4) {
904 /*
905 * If and when the name of new object to be queried contains
906 * either whitespace or multibyte characters, they shall be
907 * encoded based on the percentage-encoding rule.
908 * If not encoded, the sscanf logic picks up only left-half
909 * of the supplied name; splitted by a whitespace unexpectedly.
910 */
911 char *r, *w;
912 int c1, c2;
913
914 r = w = namebuf;
915 do {
916 c1 = *r++;
917 if (c1 == '+')
918 c1 = ' ';
919 else if (c1 == '%') {
920 c1 = hex_to_bin(*r++);
921 if (c1 < 0)
922 goto out;
923 c2 = hex_to_bin(*r++);
924 if (c2 < 0)
925 goto out;
926 c1 = (c1 << 4) | c2;
927 }
928 *w++ = c1;
929 } while (c1 != '\0');
930
931 objname = namebuf;
932 }
933
934 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
935 if (length)
936 goto out;
937
938 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
939 if (length)
940 goto out;
941
942 length = security_transition_sid_user(state, ssid, tsid, tclass,
943 objname, &newsid);
944 if (length)
945 goto out;
946
947 length = security_sid_to_context(state, newsid, &newcon, &len);
948 if (length)
949 goto out;
950
951 length = -ERANGE;
952 if (len > SIMPLE_TRANSACTION_LIMIT) {
953 pr_err("SELinux: %s: context size (%u) exceeds "
954 "payload max\n", __func__, len);
955 goto out;
956 }
957
958 memcpy(buf, newcon, len);
959 length = len;
960 out:
961 kfree(newcon);
962 kfree(namebuf);
963 kfree(tcon);
964 kfree(scon);
965 return length;
966 }
967
968 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
969 {
970 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
971 struct selinux_state *state = fsi->state;
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 = avc_has_perm(&selinux_state,
980 current_sid(), SECINITSID_SECURITY,
981 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
982 NULL);
983 if (length)
984 goto out;
985
986 length = -ENOMEM;
987 scon = kzalloc(size + 1, GFP_KERNEL);
988 if (!scon)
989 goto out;
990
991 length = -ENOMEM;
992 tcon = kzalloc(size + 1, GFP_KERNEL);
993 if (!tcon)
994 goto out;
995
996 length = -EINVAL;
997 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
998 goto out;
999
1000 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1001 if (length)
1002 goto out;
1003
1004 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1005 if (length)
1006 goto out;
1007
1008 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1009 if (length)
1010 goto out;
1011
1012 length = security_sid_to_context(state, newsid, &newcon, &len);
1013 if (length)
1014 goto out;
1015
1016 length = -ERANGE;
1017 if (len > SIMPLE_TRANSACTION_LIMIT)
1018 goto out;
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 ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1030 {
1031 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1032 struct selinux_state *state = fsi->state;
1033 char *con = NULL, *user = NULL, *ptr;
1034 u32 sid, *sids = NULL;
1035 ssize_t length;
1036 char *newcon;
1037 int i, rc;
1038 u32 len, nsids;
1039
1040 length = avc_has_perm(&selinux_state,
1041 current_sid(), SECINITSID_SECURITY,
1042 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1043 NULL);
1044 if (length)
1045 goto out;
1046
1047 length = -ENOMEM;
1048 con = kzalloc(size + 1, GFP_KERNEL);
1049 if (!con)
1050 goto out;
1051
1052 length = -ENOMEM;
1053 user = kzalloc(size + 1, GFP_KERNEL);
1054 if (!user)
1055 goto out;
1056
1057 length = -EINVAL;
1058 if (sscanf(buf, "%s %s", con, user) != 2)
1059 goto out;
1060
1061 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1062 if (length)
1063 goto out;
1064
1065 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1066 if (length)
1067 goto out;
1068
1069 length = sprintf(buf, "%u", nsids) + 1;
1070 ptr = buf + length;
1071 for (i = 0; i < nsids; i++) {
1072 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1073 if (rc) {
1074 length = rc;
1075 goto out;
1076 }
1077 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1078 kfree(newcon);
1079 length = -ERANGE;
1080 goto out;
1081 }
1082 memcpy(ptr, newcon, len);
1083 kfree(newcon);
1084 ptr += len;
1085 length += len;
1086 }
1087 out:
1088 kfree(sids);
1089 kfree(user);
1090 kfree(con);
1091 return length;
1092 }
1093
1094 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1095 {
1096 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1097 struct selinux_state *state = fsi->state;
1098 char *scon = NULL, *tcon = NULL;
1099 u32 ssid, tsid, newsid;
1100 u16 tclass;
1101 ssize_t length;
1102 char *newcon = NULL;
1103 u32 len;
1104
1105 length = avc_has_perm(&selinux_state,
1106 current_sid(), SECINITSID_SECURITY,
1107 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1108 NULL);
1109 if (length)
1110 goto out;
1111
1112 length = -ENOMEM;
1113 scon = kzalloc(size + 1, GFP_KERNEL);
1114 if (!scon)
1115 goto out;
1116
1117 length = -ENOMEM;
1118 tcon = kzalloc(size + 1, GFP_KERNEL);
1119 if (!tcon)
1120 goto out;
1121
1122 length = -EINVAL;
1123 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1124 goto out;
1125
1126 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1127 if (length)
1128 goto out;
1129
1130 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1131 if (length)
1132 goto out;
1133
1134 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1135 if (length)
1136 goto out;
1137
1138 length = security_sid_to_context(state, newsid, &newcon, &len);
1139 if (length)
1140 goto out;
1141
1142 length = -ERANGE;
1143 if (len > SIMPLE_TRANSACTION_LIMIT) {
1144 pr_err("SELinux: %s: context size (%u) exceeds "
1145 "payload max\n", __func__, len);
1146 goto out;
1147 }
1148
1149 memcpy(buf, newcon, len);
1150 length = len;
1151 out:
1152 kfree(newcon);
1153 kfree(tcon);
1154 kfree(scon);
1155 return length;
1156 }
1157
1158 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1159 {
1160 struct inode *ret = new_inode(sb);
1161
1162 if (ret) {
1163 ret->i_mode = mode;
1164 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1165 }
1166 return ret;
1167 }
1168
1169 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1170 size_t count, loff_t *ppos)
1171 {
1172 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1173 char *page = NULL;
1174 ssize_t length;
1175 ssize_t ret;
1176 int cur_enforcing;
1177 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1178 const char *name = filep->f_path.dentry->d_name.name;
1179
1180 mutex_lock(&fsi->mutex);
1181
1182 ret = -EINVAL;
1183 if (index >= fsi->bool_num || strcmp(name,
1184 fsi->bool_pending_names[index]))
1185 goto out_unlock;
1186
1187 ret = -ENOMEM;
1188 page = (char *)get_zeroed_page(GFP_KERNEL);
1189 if (!page)
1190 goto out_unlock;
1191
1192 cur_enforcing = security_get_bool_value(fsi->state, index);
1193 if (cur_enforcing < 0) {
1194 ret = cur_enforcing;
1195 goto out_unlock;
1196 }
1197 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1198 fsi->bool_pending_values[index]);
1199 mutex_unlock(&fsi->mutex);
1200 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1201 out_free:
1202 free_page((unsigned long)page);
1203 return ret;
1204
1205 out_unlock:
1206 mutex_unlock(&fsi->mutex);
1207 goto out_free;
1208 }
1209
1210 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1211 size_t count, loff_t *ppos)
1212 {
1213 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1214 char *page = NULL;
1215 ssize_t length;
1216 int new_value;
1217 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1218 const char *name = filep->f_path.dentry->d_name.name;
1219
1220 if (count >= PAGE_SIZE)
1221 return -ENOMEM;
1222
1223 /* No partial writes. */
1224 if (*ppos != 0)
1225 return -EINVAL;
1226
1227 page = memdup_user_nul(buf, count);
1228 if (IS_ERR(page))
1229 return PTR_ERR(page);
1230
1231 mutex_lock(&fsi->mutex);
1232
1233 length = avc_has_perm(&selinux_state,
1234 current_sid(), SECINITSID_SECURITY,
1235 SECCLASS_SECURITY, SECURITY__SETBOOL,
1236 NULL);
1237 if (length)
1238 goto out;
1239
1240 length = -EINVAL;
1241 if (index >= fsi->bool_num || strcmp(name,
1242 fsi->bool_pending_names[index]))
1243 goto out;
1244
1245 length = -EINVAL;
1246 if (sscanf(page, "%d", &new_value) != 1)
1247 goto out;
1248
1249 if (new_value)
1250 new_value = 1;
1251
1252 fsi->bool_pending_values[index] = new_value;
1253 length = count;
1254
1255 out:
1256 mutex_unlock(&fsi->mutex);
1257 kfree(page);
1258 return length;
1259 }
1260
1261 static const struct file_operations sel_bool_ops = {
1262 .read = sel_read_bool,
1263 .write = sel_write_bool,
1264 .llseek = generic_file_llseek,
1265 };
1266
1267 static ssize_t sel_commit_bools_write(struct file *filep,
1268 const char __user *buf,
1269 size_t count, loff_t *ppos)
1270 {
1271 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1272 char *page = NULL;
1273 ssize_t length;
1274 int new_value;
1275
1276 if (count >= PAGE_SIZE)
1277 return -ENOMEM;
1278
1279 /* No partial writes. */
1280 if (*ppos != 0)
1281 return -EINVAL;
1282
1283 page = memdup_user_nul(buf, count);
1284 if (IS_ERR(page))
1285 return PTR_ERR(page);
1286
1287 mutex_lock(&fsi->mutex);
1288
1289 length = avc_has_perm(&selinux_state,
1290 current_sid(), SECINITSID_SECURITY,
1291 SECCLASS_SECURITY, SECURITY__SETBOOL,
1292 NULL);
1293 if (length)
1294 goto out;
1295
1296 length = -EINVAL;
1297 if (sscanf(page, "%d", &new_value) != 1)
1298 goto out;
1299
1300 length = 0;
1301 if (new_value && fsi->bool_pending_values)
1302 length = security_set_bools(fsi->state, fsi->bool_num,
1303 fsi->bool_pending_values);
1304
1305 if (!length)
1306 length = count;
1307
1308 out:
1309 mutex_unlock(&fsi->mutex);
1310 kfree(page);
1311 return length;
1312 }
1313
1314 static const struct file_operations sel_commit_bools_ops = {
1315 .write = sel_commit_bools_write,
1316 .llseek = generic_file_llseek,
1317 };
1318
1319 static void sel_remove_entries(struct dentry *de)
1320 {
1321 d_genocide(de);
1322 shrink_dcache_parent(de);
1323 }
1324
1325 #define BOOL_DIR_NAME "booleans"
1326
1327 static int sel_make_bools(struct selinux_fs_info *fsi)
1328 {
1329 int i, ret;
1330 ssize_t len;
1331 struct dentry *dentry = NULL;
1332 struct dentry *dir = fsi->bool_dir;
1333 struct inode *inode = NULL;
1334 struct inode_security_struct *isec;
1335 char **names = NULL, *page;
1336 int num;
1337 int *values = NULL;
1338 u32 sid;
1339
1340 /* remove any existing files */
1341 for (i = 0; i < fsi->bool_num; i++)
1342 kfree(fsi->bool_pending_names[i]);
1343 kfree(fsi->bool_pending_names);
1344 kfree(fsi->bool_pending_values);
1345 fsi->bool_num = 0;
1346 fsi->bool_pending_names = NULL;
1347 fsi->bool_pending_values = NULL;
1348
1349 sel_remove_entries(dir);
1350
1351 ret = -ENOMEM;
1352 page = (char *)get_zeroed_page(GFP_KERNEL);
1353 if (!page)
1354 goto out;
1355
1356 ret = security_get_bools(fsi->state, &num, &names, &values);
1357 if (ret)
1358 goto out;
1359
1360 for (i = 0; i < num; i++) {
1361 ret = -ENOMEM;
1362 dentry = d_alloc_name(dir, names[i]);
1363 if (!dentry)
1364 goto out;
1365
1366 ret = -ENOMEM;
1367 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1368 if (!inode) {
1369 dput(dentry);
1370 goto out;
1371 }
1372
1373 ret = -ENAMETOOLONG;
1374 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1375 if (len >= PAGE_SIZE) {
1376 dput(dentry);
1377 iput(inode);
1378 goto out;
1379 }
1380
1381 isec = (struct inode_security_struct *)inode->i_security;
1382 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1383 SECCLASS_FILE, &sid);
1384 if (ret) {
1385 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1386 page);
1387 sid = SECINITSID_SECURITY;
1388 }
1389
1390 isec->sid = sid;
1391 isec->initialized = LABEL_INITIALIZED;
1392 inode->i_fop = &sel_bool_ops;
1393 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1394 d_add(dentry, inode);
1395 }
1396 fsi->bool_num = num;
1397 fsi->bool_pending_names = names;
1398 fsi->bool_pending_values = values;
1399
1400 free_page((unsigned long)page);
1401 return 0;
1402 out:
1403 free_page((unsigned long)page);
1404
1405 if (names) {
1406 for (i = 0; i < num; i++)
1407 kfree(names[i]);
1408 kfree(names);
1409 }
1410 kfree(values);
1411 sel_remove_entries(dir);
1412
1413 return ret;
1414 }
1415
1416 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1417 size_t count, loff_t *ppos)
1418 {
1419 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1420 struct selinux_state *state = fsi->state;
1421 char tmpbuf[TMPBUFLEN];
1422 ssize_t length;
1423
1424 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1425 avc_get_cache_threshold(state->avc));
1426 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1427 }
1428
1429 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1430 const char __user *buf,
1431 size_t count, loff_t *ppos)
1432
1433 {
1434 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1435 struct selinux_state *state = fsi->state;
1436 char *page;
1437 ssize_t ret;
1438 unsigned int new_value;
1439
1440 ret = avc_has_perm(&selinux_state,
1441 current_sid(), SECINITSID_SECURITY,
1442 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1443 NULL);
1444 if (ret)
1445 return ret;
1446
1447 if (count >= PAGE_SIZE)
1448 return -ENOMEM;
1449
1450 /* No partial writes. */
1451 if (*ppos != 0)
1452 return -EINVAL;
1453
1454 page = memdup_user_nul(buf, count);
1455 if (IS_ERR(page))
1456 return PTR_ERR(page);
1457
1458 ret = -EINVAL;
1459 if (sscanf(page, "%u", &new_value) != 1)
1460 goto out;
1461
1462 avc_set_cache_threshold(state->avc, new_value);
1463
1464 ret = count;
1465 out:
1466 kfree(page);
1467 return ret;
1468 }
1469
1470 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1471 size_t count, loff_t *ppos)
1472 {
1473 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1474 struct selinux_state *state = fsi->state;
1475 char *page;
1476 ssize_t length;
1477
1478 page = (char *)__get_free_page(GFP_KERNEL);
1479 if (!page)
1480 return -ENOMEM;
1481
1482 length = avc_get_hash_stats(state->avc, page);
1483 if (length >= 0)
1484 length = simple_read_from_buffer(buf, count, ppos, page, length);
1485 free_page((unsigned long)page);
1486
1487 return length;
1488 }
1489
1490 static const struct file_operations sel_avc_cache_threshold_ops = {
1491 .read = sel_read_avc_cache_threshold,
1492 .write = sel_write_avc_cache_threshold,
1493 .llseek = generic_file_llseek,
1494 };
1495
1496 static const struct file_operations sel_avc_hash_stats_ops = {
1497 .read = sel_read_avc_hash_stats,
1498 .llseek = generic_file_llseek,
1499 };
1500
1501 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1502 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1503 {
1504 int cpu;
1505
1506 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1507 if (!cpu_possible(cpu))
1508 continue;
1509 *idx = cpu + 1;
1510 return &per_cpu(avc_cache_stats, cpu);
1511 }
1512 return NULL;
1513 }
1514
1515 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1516 {
1517 loff_t n = *pos - 1;
1518
1519 if (*pos == 0)
1520 return SEQ_START_TOKEN;
1521
1522 return sel_avc_get_stat_idx(&n);
1523 }
1524
1525 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1526 {
1527 return sel_avc_get_stat_idx(pos);
1528 }
1529
1530 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1531 {
1532 struct avc_cache_stats *st = v;
1533
1534 if (v == SEQ_START_TOKEN) {
1535 seq_puts(seq,
1536 "lookups hits misses allocations reclaims frees\n");
1537 } else {
1538 unsigned int lookups = st->lookups;
1539 unsigned int misses = st->misses;
1540 unsigned int hits = lookups - misses;
1541 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1542 hits, misses, st->allocations,
1543 st->reclaims, st->frees);
1544 }
1545 return 0;
1546 }
1547
1548 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1549 { }
1550
1551 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1552 .start = sel_avc_stats_seq_start,
1553 .next = sel_avc_stats_seq_next,
1554 .show = sel_avc_stats_seq_show,
1555 .stop = sel_avc_stats_seq_stop,
1556 };
1557
1558 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1559 {
1560 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1561 }
1562
1563 static const struct file_operations sel_avc_cache_stats_ops = {
1564 .open = sel_open_avc_cache_stats,
1565 .read = seq_read,
1566 .llseek = seq_lseek,
1567 .release = seq_release,
1568 };
1569 #endif
1570
1571 static int sel_make_avc_files(struct dentry *dir)
1572 {
1573 struct super_block *sb = dir->d_sb;
1574 struct selinux_fs_info *fsi = sb->s_fs_info;
1575 int i;
1576 static const struct tree_descr files[] = {
1577 { "cache_threshold",
1578 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1579 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1580 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1581 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1582 #endif
1583 };
1584
1585 for (i = 0; i < ARRAY_SIZE(files); i++) {
1586 struct inode *inode;
1587 struct dentry *dentry;
1588
1589 dentry = d_alloc_name(dir, files[i].name);
1590 if (!dentry)
1591 return -ENOMEM;
1592
1593 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1594 if (!inode) {
1595 dput(dentry);
1596 return -ENOMEM;
1597 }
1598
1599 inode->i_fop = files[i].ops;
1600 inode->i_ino = ++fsi->last_ino;
1601 d_add(dentry, inode);
1602 }
1603
1604 return 0;
1605 }
1606
1607 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1608 size_t count, loff_t *ppos)
1609 {
1610 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1611 char *con;
1612 u32 sid, len;
1613 ssize_t ret;
1614
1615 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1616 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1617 if (ret)
1618 return ret;
1619
1620 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1621 kfree(con);
1622 return ret;
1623 }
1624
1625 static const struct file_operations sel_initcon_ops = {
1626 .read = sel_read_initcon,
1627 .llseek = generic_file_llseek,
1628 };
1629
1630 static int sel_make_initcon_files(struct dentry *dir)
1631 {
1632 int i;
1633
1634 for (i = 1; i <= SECINITSID_NUM; i++) {
1635 struct inode *inode;
1636 struct dentry *dentry;
1637 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1638 if (!dentry)
1639 return -ENOMEM;
1640
1641 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1642 if (!inode) {
1643 dput(dentry);
1644 return -ENOMEM;
1645 }
1646
1647 inode->i_fop = &sel_initcon_ops;
1648 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1649 d_add(dentry, inode);
1650 }
1651
1652 return 0;
1653 }
1654
1655 static inline unsigned long sel_class_to_ino(u16 class)
1656 {
1657 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1658 }
1659
1660 static inline u16 sel_ino_to_class(unsigned long ino)
1661 {
1662 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1663 }
1664
1665 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1666 {
1667 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1668 }
1669
1670 static inline u32 sel_ino_to_perm(unsigned long ino)
1671 {
1672 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1673 }
1674
1675 static ssize_t sel_read_class(struct file *file, char __user *buf,
1676 size_t count, loff_t *ppos)
1677 {
1678 unsigned long ino = file_inode(file)->i_ino;
1679 char res[TMPBUFLEN];
1680 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1681 return simple_read_from_buffer(buf, count, ppos, res, len);
1682 }
1683
1684 static const struct file_operations sel_class_ops = {
1685 .read = sel_read_class,
1686 .llseek = generic_file_llseek,
1687 };
1688
1689 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1690 size_t count, loff_t *ppos)
1691 {
1692 unsigned long ino = file_inode(file)->i_ino;
1693 char res[TMPBUFLEN];
1694 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1695 return simple_read_from_buffer(buf, count, ppos, res, len);
1696 }
1697
1698 static const struct file_operations sel_perm_ops = {
1699 .read = sel_read_perm,
1700 .llseek = generic_file_llseek,
1701 };
1702
1703 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1704 size_t count, loff_t *ppos)
1705 {
1706 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1707 int value;
1708 char tmpbuf[TMPBUFLEN];
1709 ssize_t length;
1710 unsigned long i_ino = file_inode(file)->i_ino;
1711
1712 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1713 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1714
1715 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1716 }
1717
1718 static const struct file_operations sel_policycap_ops = {
1719 .read = sel_read_policycap,
1720 .llseek = generic_file_llseek,
1721 };
1722
1723 static int sel_make_perm_files(char *objclass, int classvalue,
1724 struct dentry *dir)
1725 {
1726 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1727 int i, rc, nperms;
1728 char **perms;
1729
1730 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1731 if (rc)
1732 return rc;
1733
1734 for (i = 0; i < nperms; i++) {
1735 struct inode *inode;
1736 struct dentry *dentry;
1737
1738 rc = -ENOMEM;
1739 dentry = d_alloc_name(dir, perms[i]);
1740 if (!dentry)
1741 goto out;
1742
1743 rc = -ENOMEM;
1744 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1745 if (!inode) {
1746 dput(dentry);
1747 goto out;
1748 }
1749
1750 inode->i_fop = &sel_perm_ops;
1751 /* i+1 since perm values are 1-indexed */
1752 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1753 d_add(dentry, inode);
1754 }
1755 rc = 0;
1756 out:
1757 for (i = 0; i < nperms; i++)
1758 kfree(perms[i]);
1759 kfree(perms);
1760 return rc;
1761 }
1762
1763 static int sel_make_class_dir_entries(char *classname, int index,
1764 struct dentry *dir)
1765 {
1766 struct super_block *sb = dir->d_sb;
1767 struct selinux_fs_info *fsi = sb->s_fs_info;
1768 struct dentry *dentry = NULL;
1769 struct inode *inode = NULL;
1770 int rc;
1771
1772 dentry = d_alloc_name(dir, "index");
1773 if (!dentry)
1774 return -ENOMEM;
1775
1776 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1777 if (!inode) {
1778 dput(dentry);
1779 return -ENOMEM;
1780 }
1781
1782 inode->i_fop = &sel_class_ops;
1783 inode->i_ino = sel_class_to_ino(index);
1784 d_add(dentry, inode);
1785
1786 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1787 if (IS_ERR(dentry))
1788 return PTR_ERR(dentry);
1789
1790 rc = sel_make_perm_files(classname, index, dentry);
1791
1792 return rc;
1793 }
1794
1795 static int sel_make_classes(struct selinux_fs_info *fsi)
1796 {
1797
1798 int rc, nclasses, i;
1799 char **classes;
1800
1801 /* delete any existing entries */
1802 sel_remove_entries(fsi->class_dir);
1803
1804 rc = security_get_classes(fsi->state, &classes, &nclasses);
1805 if (rc)
1806 return rc;
1807
1808 /* +2 since classes are 1-indexed */
1809 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1810
1811 for (i = 0; i < nclasses; i++) {
1812 struct dentry *class_name_dir;
1813
1814 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1815 &fsi->last_class_ino);
1816 if (IS_ERR(class_name_dir)) {
1817 rc = PTR_ERR(class_name_dir);
1818 goto out;
1819 }
1820
1821 /* i+1 since class values are 1-indexed */
1822 rc = sel_make_class_dir_entries(classes[i], i + 1,
1823 class_name_dir);
1824 if (rc)
1825 goto out;
1826 }
1827 rc = 0;
1828 out:
1829 for (i = 0; i < nclasses; i++)
1830 kfree(classes[i]);
1831 kfree(classes);
1832 return rc;
1833 }
1834
1835 static int sel_make_policycap(struct selinux_fs_info *fsi)
1836 {
1837 unsigned int iter;
1838 struct dentry *dentry = NULL;
1839 struct inode *inode = NULL;
1840
1841 sel_remove_entries(fsi->policycap_dir);
1842
1843 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1844 if (iter < ARRAY_SIZE(selinux_policycap_names))
1845 dentry = d_alloc_name(fsi->policycap_dir,
1846 selinux_policycap_names[iter]);
1847 else
1848 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1849
1850 if (dentry == NULL)
1851 return -ENOMEM;
1852
1853 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1854 if (inode == NULL) {
1855 dput(dentry);
1856 return -ENOMEM;
1857 }
1858
1859 inode->i_fop = &sel_policycap_ops;
1860 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1861 d_add(dentry, inode);
1862 }
1863
1864 return 0;
1865 }
1866
1867 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1868 unsigned long *ino)
1869 {
1870 struct dentry *dentry = d_alloc_name(dir, name);
1871 struct inode *inode;
1872
1873 if (!dentry)
1874 return ERR_PTR(-ENOMEM);
1875
1876 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1877 if (!inode) {
1878 dput(dentry);
1879 return ERR_PTR(-ENOMEM);
1880 }
1881
1882 inode->i_op = &simple_dir_inode_operations;
1883 inode->i_fop = &simple_dir_operations;
1884 inode->i_ino = ++(*ino);
1885 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1886 inc_nlink(inode);
1887 d_add(dentry, inode);
1888 /* bump link count on parent directory, too */
1889 inc_nlink(d_inode(dir));
1890
1891 return dentry;
1892 }
1893
1894 #define NULL_FILE_NAME "null"
1895
1896 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1897 {
1898 struct selinux_fs_info *fsi;
1899 int ret;
1900 struct dentry *dentry;
1901 struct inode *inode;
1902 struct inode_security_struct *isec;
1903
1904 static const struct tree_descr selinux_files[] = {
1905 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1906 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1907 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1908 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1909 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1910 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1911 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1912 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1913 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1914 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1915 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1916 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1917 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1918 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1919 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1920 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1921 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1922 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1923 S_IWUGO},
1924 /* last one */ {""}
1925 };
1926
1927 ret = selinux_fs_info_create(sb);
1928 if (ret)
1929 goto err;
1930
1931 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1932 if (ret)
1933 goto err;
1934
1935 fsi = sb->s_fs_info;
1936 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
1937 if (IS_ERR(fsi->bool_dir)) {
1938 ret = PTR_ERR(fsi->bool_dir);
1939 fsi->bool_dir = NULL;
1940 goto err;
1941 }
1942
1943 ret = -ENOMEM;
1944 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1945 if (!dentry)
1946 goto err;
1947
1948 ret = -ENOMEM;
1949 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1950 if (!inode) {
1951 dput(dentry);
1952 goto err;
1953 }
1954
1955 inode->i_ino = ++fsi->last_ino;
1956 isec = (struct inode_security_struct *)inode->i_security;
1957 isec->sid = SECINITSID_DEVNULL;
1958 isec->sclass = SECCLASS_CHR_FILE;
1959 isec->initialized = LABEL_INITIALIZED;
1960
1961 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1962 d_add(dentry, inode);
1963
1964 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
1965 if (IS_ERR(dentry)) {
1966 ret = PTR_ERR(dentry);
1967 goto err;
1968 }
1969
1970 ret = sel_make_avc_files(dentry);
1971 if (ret)
1972 goto err;
1973
1974 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
1975 if (IS_ERR(dentry)) {
1976 ret = PTR_ERR(dentry);
1977 goto err;
1978 }
1979
1980 ret = sel_make_initcon_files(dentry);
1981 if (ret)
1982 goto err;
1983
1984 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
1985 if (IS_ERR(fsi->class_dir)) {
1986 ret = PTR_ERR(fsi->class_dir);
1987 fsi->class_dir = NULL;
1988 goto err;
1989 }
1990
1991 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
1992 &fsi->last_ino);
1993 if (IS_ERR(fsi->policycap_dir)) {
1994 ret = PTR_ERR(fsi->policycap_dir);
1995 fsi->policycap_dir = NULL;
1996 goto err;
1997 }
1998
1999 ret = sel_make_policy_nodes(fsi);
2000 if (ret)
2001 goto err;
2002 return 0;
2003 err:
2004 pr_err("SELinux: %s: failed while creating inodes\n",
2005 __func__);
2006
2007 selinux_fs_info_free(sb);
2008
2009 return ret;
2010 }
2011
2012 static struct dentry *sel_mount(struct file_system_type *fs_type,
2013 int flags, const char *dev_name, void *data)
2014 {
2015 return mount_single(fs_type, flags, data, sel_fill_super);
2016 }
2017
2018 static void sel_kill_sb(struct super_block *sb)
2019 {
2020 selinux_fs_info_free(sb);
2021 kill_litter_super(sb);
2022 }
2023
2024 static struct file_system_type sel_fs_type = {
2025 .name = "selinuxfs",
2026 .mount = sel_mount,
2027 .kill_sb = sel_kill_sb,
2028 };
2029
2030 struct vfsmount *selinuxfs_mount;
2031 struct path selinux_null;
2032
2033 static int __init init_sel_fs(void)
2034 {
2035 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2036 sizeof(NULL_FILE_NAME)-1);
2037 int err;
2038
2039 if (!selinux_enabled)
2040 return 0;
2041
2042 err = sysfs_create_mount_point(fs_kobj, "selinux");
2043 if (err)
2044 return err;
2045
2046 err = register_filesystem(&sel_fs_type);
2047 if (err) {
2048 sysfs_remove_mount_point(fs_kobj, "selinux");
2049 return err;
2050 }
2051
2052 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2053 if (IS_ERR(selinuxfs_mount)) {
2054 pr_err("selinuxfs: could not mount!\n");
2055 err = PTR_ERR(selinuxfs_mount);
2056 selinuxfs_mount = NULL;
2057 }
2058 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2059 &null_name);
2060 if (IS_ERR(selinux_null.dentry)) {
2061 pr_err("selinuxfs: could not lookup null!\n");
2062 err = PTR_ERR(selinux_null.dentry);
2063 selinux_null.dentry = NULL;
2064 }
2065
2066 return err;
2067 }
2068
2069 __initcall(init_sel_fs);
2070
2071 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2072 void exit_sel_fs(void)
2073 {
2074 sysfs_remove_mount_point(fs_kobj, "selinux");
2075 dput(selinux_null.dentry);
2076 kern_unmount(selinuxfs_mount);
2077 unregister_filesystem(&sel_fs_type);
2078 }
2079 #endif
Linux with added FPC-III support