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erofs: reduntant assignment in __erofs_get_meta_page()
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blobe6c7643c3fc08219e07b3fd8894abb3a8df4ff1d
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 *
4 * Added conditional policy language extensions
5 *
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
7 *
8 * Added support for the policy capability bitmap
9 *
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/pagemap.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
19 #include <linux/fs.h>
20 #include <linux/fs_context.h>
21 #include <linux/mount.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
33
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37 #include "flask.h"
38 #include "avc.h"
39 #include "avc_ss.h"
40 #include "security.h"
41 #include "objsec.h"
42 #include "conditional.h"
43
44 enum sel_inos {
45 SEL_ROOT_INO = 2,
46 SEL_LOAD, /* load policy */
47 SEL_ENFORCE, /* get or set enforcing status */
48 SEL_CONTEXT, /* validate context */
49 SEL_ACCESS, /* compute access decision */
50 SEL_CREATE, /* compute create labeling decision */
51 SEL_RELABEL, /* compute relabeling decision */
52 SEL_USER, /* compute reachable user contexts */
53 SEL_POLICYVERS, /* return policy version for this kernel */
54 SEL_COMMIT_BOOLS, /* commit new boolean values */
55 SEL_MLS, /* return if MLS policy is enabled */
56 SEL_DISABLE, /* disable SELinux until next reboot */
57 SEL_MEMBER, /* compute polyinstantiation membership decision */
58 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
59 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
60 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
61 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
62 SEL_STATUS, /* export current status using mmap() */
63 SEL_POLICY, /* allow userspace to read the in kernel policy */
64 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
65 SEL_INO_NEXT, /* The next inode number to use */
66 };
67
68 struct selinux_fs_info {
69 struct dentry *bool_dir;
70 unsigned int bool_num;
71 char **bool_pending_names;
72 unsigned int *bool_pending_values;
73 struct dentry *class_dir;
74 unsigned long last_class_ino;
75 bool policy_opened;
76 struct dentry *policycap_dir;
77 struct mutex mutex;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
81 };
82
83 static int selinux_fs_info_create(struct super_block *sb)
84 {
85 struct selinux_fs_info *fsi;
86
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
88 if (!fsi)
89 return -ENOMEM;
90
91 mutex_init(&fsi->mutex);
92 fsi->last_ino = SEL_INO_NEXT - 1;
93 fsi->state = &selinux_state;
94 fsi->sb = sb;
95 sb->s_fs_info = fsi;
96 return 0;
97 }
98
99 static void selinux_fs_info_free(struct super_block *sb)
100 {
101 struct selinux_fs_info *fsi = sb->s_fs_info;
102 int i;
103
104 if (fsi) {
105 for (i = 0; i < fsi->bool_num; i++)
106 kfree(fsi->bool_pending_names[i]);
107 kfree(fsi->bool_pending_names);
108 kfree(fsi->bool_pending_values);
109 }
110 kfree(sb->s_fs_info);
111 sb->s_fs_info = NULL;
112 }
113
114 #define SEL_INITCON_INO_OFFSET 0x01000000
115 #define SEL_BOOL_INO_OFFSET 0x02000000
116 #define SEL_CLASS_INO_OFFSET 0x04000000
117 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
118 #define SEL_INO_MASK 0x00ffffff
119
120 #define TMPBUFLEN 12
121 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
122 size_t count, loff_t *ppos)
123 {
124 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
125 char tmpbuf[TMPBUFLEN];
126 ssize_t length;
127
128 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
129 enforcing_enabled(fsi->state));
130 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
131 }
132
133 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
134 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
135 size_t count, loff_t *ppos)
136
137 {
138 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
139 struct selinux_state *state = fsi->state;
140 char *page = NULL;
141 ssize_t length;
142 int old_value, new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146
147 /* No partial writes. */
148 if (*ppos != 0)
149 return -EINVAL;
150
151 page = memdup_user_nul(buf, count);
152 if (IS_ERR(page))
153 return PTR_ERR(page);
154
155 length = -EINVAL;
156 if (sscanf(page, "%d", &new_value) != 1)
157 goto out;
158
159 new_value = !!new_value;
160
161 old_value = enforcing_enabled(state);
162 if (new_value != old_value) {
163 length = avc_has_perm(&selinux_state,
164 current_sid(), SECINITSID_SECURITY,
165 SECCLASS_SECURITY, SECURITY__SETENFORCE,
166 NULL);
167 if (length)
168 goto out;
169 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
171 " enabled=%d old-enabled=%d lsm=selinux res=1",
172 new_value, old_value,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current),
175 selinux_enabled, selinux_enabled);
176 enforcing_set(state, new_value);
177 if (new_value)
178 avc_ss_reset(state->avc, 0);
179 selnl_notify_setenforce(new_value);
180 selinux_status_update_setenforce(state, new_value);
181 if (!new_value)
182 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
183 }
184 length = count;
185 out:
186 kfree(page);
187 return length;
188 }
189 #else
190 #define sel_write_enforce NULL
191 #endif
192
193 static const struct file_operations sel_enforce_ops = {
194 .read = sel_read_enforce,
195 .write = sel_write_enforce,
196 .llseek = generic_file_llseek,
197 };
198
199 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
200 size_t count, loff_t *ppos)
201 {
202 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
203 struct selinux_state *state = fsi->state;
204 char tmpbuf[TMPBUFLEN];
205 ssize_t length;
206 ino_t ino = file_inode(filp)->i_ino;
207 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
208 security_get_reject_unknown(state) :
209 !security_get_allow_unknown(state);
210
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213 }
214
215 static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 .llseek = generic_file_llseek,
218 };
219
220 static int sel_open_handle_status(struct inode *inode, struct file *filp)
221 {
222 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
223 struct page *status = selinux_kernel_status_page(fsi->state);
224
225 if (!status)
226 return -ENOMEM;
227
228 filp->private_data = status;
229
230 return 0;
231 }
232
233 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
234 size_t count, loff_t *ppos)
235 {
236 struct page *status = filp->private_data;
237
238 BUG_ON(!status);
239
240 return simple_read_from_buffer(buf, count, ppos,
241 page_address(status),
242 sizeof(struct selinux_kernel_status));
243 }
244
245 static int sel_mmap_handle_status(struct file *filp,
246 struct vm_area_struct *vma)
247 {
248 struct page *status = filp->private_data;
249 unsigned long size = vma->vm_end - vma->vm_start;
250
251 BUG_ON(!status);
252
253 /* only allows one page from the head */
254 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
255 return -EIO;
256 /* disallow writable mapping */
257 if (vma->vm_flags & VM_WRITE)
258 return -EPERM;
259 /* disallow mprotect() turns it into writable */
260 vma->vm_flags &= ~VM_MAYWRITE;
261
262 return remap_pfn_range(vma, vma->vm_start,
263 page_to_pfn(status),
264 size, vma->vm_page_prot);
265 }
266
267 static const struct file_operations sel_handle_status_ops = {
268 .open = sel_open_handle_status,
269 .read = sel_read_handle_status,
270 .mmap = sel_mmap_handle_status,
271 .llseek = generic_file_llseek,
272 };
273
274 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
275 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
276 size_t count, loff_t *ppos)
277
278 {
279 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
280 char *page;
281 ssize_t length;
282 int new_value;
283 int enforcing;
284
285 if (count >= PAGE_SIZE)
286 return -ENOMEM;
287
288 /* No partial writes. */
289 if (*ppos != 0)
290 return -EINVAL;
291
292 page = memdup_user_nul(buf, count);
293 if (IS_ERR(page))
294 return PTR_ERR(page);
295
296 length = -EINVAL;
297 if (sscanf(page, "%d", &new_value) != 1)
298 goto out;
299
300 if (new_value) {
301 enforcing = enforcing_enabled(fsi->state);
302 length = selinux_disable(fsi->state);
303 if (length)
304 goto out;
305 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
306 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
307 " enabled=%d old-enabled=%d lsm=selinux res=1",
308 enforcing, enforcing,
309 from_kuid(&init_user_ns, audit_get_loginuid(current)),
310 audit_get_sessionid(current), 0, 1);
311 }
312
313 length = count;
314 out:
315 kfree(page);
316 return length;
317 }
318 #else
319 #define sel_write_disable NULL
320 #endif
321
322 static const struct file_operations sel_disable_ops = {
323 .write = sel_write_disable,
324 .llseek = generic_file_llseek,
325 };
326
327 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
328 size_t count, loff_t *ppos)
329 {
330 char tmpbuf[TMPBUFLEN];
331 ssize_t length;
332
333 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
334 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
335 }
336
337 static const struct file_operations sel_policyvers_ops = {
338 .read = sel_read_policyvers,
339 .llseek = generic_file_llseek,
340 };
341
342 /* declaration for sel_write_load */
343 static int sel_make_bools(struct selinux_fs_info *fsi);
344 static int sel_make_classes(struct selinux_fs_info *fsi);
345 static int sel_make_policycap(struct selinux_fs_info *fsi);
346
347 /* declaration for sel_make_class_dirs */
348 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
349 unsigned long *ino);
350
351 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
352 size_t count, loff_t *ppos)
353 {
354 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
355 char tmpbuf[TMPBUFLEN];
356 ssize_t length;
357
358 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
359 security_mls_enabled(fsi->state));
360 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
361 }
362
363 static const struct file_operations sel_mls_ops = {
364 .read = sel_read_mls,
365 .llseek = generic_file_llseek,
366 };
367
368 struct policy_load_memory {
369 size_t len;
370 void *data;
371 };
372
373 static int sel_open_policy(struct inode *inode, struct file *filp)
374 {
375 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
376 struct selinux_state *state = fsi->state;
377 struct policy_load_memory *plm = NULL;
378 int rc;
379
380 BUG_ON(filp->private_data);
381
382 mutex_lock(&fsi->mutex);
383
384 rc = avc_has_perm(&selinux_state,
385 current_sid(), SECINITSID_SECURITY,
386 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
387 if (rc)
388 goto err;
389
390 rc = -EBUSY;
391 if (fsi->policy_opened)
392 goto err;
393
394 rc = -ENOMEM;
395 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
396 if (!plm)
397 goto err;
398
399 if (i_size_read(inode) != security_policydb_len(state)) {
400 inode_lock(inode);
401 i_size_write(inode, security_policydb_len(state));
402 inode_unlock(inode);
403 }
404
405 rc = security_read_policy(state, &plm->data, &plm->len);
406 if (rc)
407 goto err;
408
409 fsi->policy_opened = 1;
410
411 filp->private_data = plm;
412
413 mutex_unlock(&fsi->mutex);
414
415 return 0;
416 err:
417 mutex_unlock(&fsi->mutex);
418
419 if (plm)
420 vfree(plm->data);
421 kfree(plm);
422 return rc;
423 }
424
425 static int sel_release_policy(struct inode *inode, struct file *filp)
426 {
427 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
428 struct policy_load_memory *plm = filp->private_data;
429
430 BUG_ON(!plm);
431
432 fsi->policy_opened = 0;
433
434 vfree(plm->data);
435 kfree(plm);
436
437 return 0;
438 }
439
440 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
441 size_t count, loff_t *ppos)
442 {
443 struct policy_load_memory *plm = filp->private_data;
444 int ret;
445
446 ret = avc_has_perm(&selinux_state,
447 current_sid(), SECINITSID_SECURITY,
448 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
449 if (ret)
450 return ret;
451
452 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
453 }
454
455 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
456 {
457 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
458 unsigned long offset;
459 struct page *page;
460
461 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
462 return VM_FAULT_SIGBUS;
463
464 offset = vmf->pgoff << PAGE_SHIFT;
465 if (offset >= roundup(plm->len, PAGE_SIZE))
466 return VM_FAULT_SIGBUS;
467
468 page = vmalloc_to_page(plm->data + offset);
469 get_page(page);
470
471 vmf->page = page;
472
473 return 0;
474 }
475
476 static const struct vm_operations_struct sel_mmap_policy_ops = {
477 .fault = sel_mmap_policy_fault,
478 .page_mkwrite = sel_mmap_policy_fault,
479 };
480
481 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
482 {
483 if (vma->vm_flags & VM_SHARED) {
484 /* do not allow mprotect to make mapping writable */
485 vma->vm_flags &= ~VM_MAYWRITE;
486
487 if (vma->vm_flags & VM_WRITE)
488 return -EACCES;
489 }
490
491 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
492 vma->vm_ops = &sel_mmap_policy_ops;
493
494 return 0;
495 }
496
497 static const struct file_operations sel_policy_ops = {
498 .open = sel_open_policy,
499 .read = sel_read_policy,
500 .mmap = sel_mmap_policy,
501 .release = sel_release_policy,
502 .llseek = generic_file_llseek,
503 };
504
505 static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
506 {
507 int ret;
508
509 ret = sel_make_bools(fsi);
510 if (ret) {
511 pr_err("SELinux: failed to load policy booleans\n");
512 return ret;
513 }
514
515 ret = sel_make_classes(fsi);
516 if (ret) {
517 pr_err("SELinux: failed to load policy classes\n");
518 return ret;
519 }
520
521 ret = sel_make_policycap(fsi);
522 if (ret) {
523 pr_err("SELinux: failed to load policy capabilities\n");
524 return ret;
525 }
526
527 return 0;
528 }
529
530 static ssize_t sel_write_load(struct file *file, const char __user *buf,
531 size_t count, loff_t *ppos)
532
533 {
534 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
535 ssize_t length;
536 void *data = NULL;
537
538 mutex_lock(&fsi->mutex);
539
540 length = avc_has_perm(&selinux_state,
541 current_sid(), SECINITSID_SECURITY,
542 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
543 if (length)
544 goto out;
545
546 /* No partial writes. */
547 length = -EINVAL;
548 if (*ppos != 0)
549 goto out;
550
551 length = -EFBIG;
552 if (count > 64 * 1024 * 1024)
553 goto out;
554
555 length = -ENOMEM;
556 data = vmalloc(count);
557 if (!data)
558 goto out;
559
560 length = -EFAULT;
561 if (copy_from_user(data, buf, count) != 0)
562 goto out;
563
564 length = security_load_policy(fsi->state, data, count);
565 if (length) {
566 pr_warn_ratelimited("SELinux: failed to load policy\n");
567 goto out;
568 }
569
570 length = sel_make_policy_nodes(fsi);
571 if (length)
572 goto out1;
573
574 length = count;
575
576 out1:
577 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
578 "auid=%u ses=%u lsm=selinux res=1",
579 from_kuid(&init_user_ns, audit_get_loginuid(current)),
580 audit_get_sessionid(current));
581 out:
582 mutex_unlock(&fsi->mutex);
583 vfree(data);
584 return length;
585 }
586
587 static const struct file_operations sel_load_ops = {
588 .write = sel_write_load,
589 .llseek = generic_file_llseek,
590 };
591
592 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
593 {
594 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
595 struct selinux_state *state = fsi->state;
596 char *canon = NULL;
597 u32 sid, len;
598 ssize_t length;
599
600 length = avc_has_perm(&selinux_state,
601 current_sid(), SECINITSID_SECURITY,
602 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
603 if (length)
604 goto out;
605
606 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
607 if (length)
608 goto out;
609
610 length = security_sid_to_context(state, sid, &canon, &len);
611 if (length)
612 goto out;
613
614 length = -ERANGE;
615 if (len > SIMPLE_TRANSACTION_LIMIT) {
616 pr_err("SELinux: %s: context size (%u) exceeds "
617 "payload max\n", __func__, len);
618 goto out;
619 }
620
621 memcpy(buf, canon, len);
622 length = len;
623 out:
624 kfree(canon);
625 return length;
626 }
627
628 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
629 size_t count, loff_t *ppos)
630 {
631 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
632 char tmpbuf[TMPBUFLEN];
633 ssize_t length;
634
635 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
636 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
637 }
638
639 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
640 size_t count, loff_t *ppos)
641 {
642 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
643 char *page;
644 ssize_t length;
645 unsigned int new_value;
646
647 length = avc_has_perm(&selinux_state,
648 current_sid(), SECINITSID_SECURITY,
649 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
650 NULL);
651 if (length)
652 return length;
653
654 if (count >= PAGE_SIZE)
655 return -ENOMEM;
656
657 /* No partial writes. */
658 if (*ppos != 0)
659 return -EINVAL;
660
661 page = memdup_user_nul(buf, count);
662 if (IS_ERR(page))
663 return PTR_ERR(page);
664
665 length = -EINVAL;
666 if (sscanf(page, "%u", &new_value) != 1)
667 goto out;
668
669 fsi->state->checkreqprot = new_value ? 1 : 0;
670 length = count;
671 out:
672 kfree(page);
673 return length;
674 }
675 static const struct file_operations sel_checkreqprot_ops = {
676 .read = sel_read_checkreqprot,
677 .write = sel_write_checkreqprot,
678 .llseek = generic_file_llseek,
679 };
680
681 static ssize_t sel_write_validatetrans(struct file *file,
682 const char __user *buf,
683 size_t count, loff_t *ppos)
684 {
685 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
686 struct selinux_state *state = fsi->state;
687 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
688 char *req = NULL;
689 u32 osid, nsid, tsid;
690 u16 tclass;
691 int rc;
692
693 rc = avc_has_perm(&selinux_state,
694 current_sid(), SECINITSID_SECURITY,
695 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
696 if (rc)
697 goto out;
698
699 rc = -ENOMEM;
700 if (count >= PAGE_SIZE)
701 goto out;
702
703 /* No partial writes. */
704 rc = -EINVAL;
705 if (*ppos != 0)
706 goto out;
707
708 req = memdup_user_nul(buf, count);
709 if (IS_ERR(req)) {
710 rc = PTR_ERR(req);
711 req = NULL;
712 goto out;
713 }
714
715 rc = -ENOMEM;
716 oldcon = kzalloc(count + 1, GFP_KERNEL);
717 if (!oldcon)
718 goto out;
719
720 newcon = kzalloc(count + 1, GFP_KERNEL);
721 if (!newcon)
722 goto out;
723
724 taskcon = kzalloc(count + 1, GFP_KERNEL);
725 if (!taskcon)
726 goto out;
727
728 rc = -EINVAL;
729 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
730 goto out;
731
732 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
733 if (rc)
734 goto out;
735
736 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
737 if (rc)
738 goto out;
739
740 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
741 if (rc)
742 goto out;
743
744 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
745 if (!rc)
746 rc = count;
747 out:
748 kfree(req);
749 kfree(oldcon);
750 kfree(newcon);
751 kfree(taskcon);
752 return rc;
753 }
754
755 static const struct file_operations sel_transition_ops = {
756 .write = sel_write_validatetrans,
757 .llseek = generic_file_llseek,
758 };
759
760 /*
761 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
762 */
763 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
764 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
765 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
766 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
767 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
768
769 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
770 [SEL_ACCESS] = sel_write_access,
771 [SEL_CREATE] = sel_write_create,
772 [SEL_RELABEL] = sel_write_relabel,
773 [SEL_USER] = sel_write_user,
774 [SEL_MEMBER] = sel_write_member,
775 [SEL_CONTEXT] = sel_write_context,
776 };
777
778 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
779 {
780 ino_t ino = file_inode(file)->i_ino;
781 char *data;
782 ssize_t rv;
783
784 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
785 return -EINVAL;
786
787 data = simple_transaction_get(file, buf, size);
788 if (IS_ERR(data))
789 return PTR_ERR(data);
790
791 rv = write_op[ino](file, data, size);
792 if (rv > 0) {
793 simple_transaction_set(file, rv);
794 rv = size;
795 }
796 return rv;
797 }
798
799 static const struct file_operations transaction_ops = {
800 .write = selinux_transaction_write,
801 .read = simple_transaction_read,
802 .release = simple_transaction_release,
803 .llseek = generic_file_llseek,
804 };
805
806 /*
807 * payload - write methods
808 * If the method has a response, the response should be put in buf,
809 * and the length returned. Otherwise return 0 or and -error.
810 */
811
812 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
813 {
814 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
815 struct selinux_state *state = fsi->state;
816 char *scon = NULL, *tcon = NULL;
817 u32 ssid, tsid;
818 u16 tclass;
819 struct av_decision avd;
820 ssize_t length;
821
822 length = avc_has_perm(&selinux_state,
823 current_sid(), SECINITSID_SECURITY,
824 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
825 if (length)
826 goto out;
827
828 length = -ENOMEM;
829 scon = kzalloc(size + 1, GFP_KERNEL);
830 if (!scon)
831 goto out;
832
833 length = -ENOMEM;
834 tcon = kzalloc(size + 1, GFP_KERNEL);
835 if (!tcon)
836 goto out;
837
838 length = -EINVAL;
839 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
840 goto out;
841
842 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
843 if (length)
844 goto out;
845
846 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
847 if (length)
848 goto out;
849
850 security_compute_av_user(state, ssid, tsid, tclass, &avd);
851
852 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
853 "%x %x %x %x %u %x",
854 avd.allowed, 0xffffffff,
855 avd.auditallow, avd.auditdeny,
856 avd.seqno, avd.flags);
857 out:
858 kfree(tcon);
859 kfree(scon);
860 return length;
861 }
862
863 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
864 {
865 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
866 struct selinux_state *state = fsi->state;
867 char *scon = NULL, *tcon = NULL;
868 char *namebuf = NULL, *objname = NULL;
869 u32 ssid, tsid, newsid;
870 u16 tclass;
871 ssize_t length;
872 char *newcon = NULL;
873 u32 len;
874 int nargs;
875
876 length = avc_has_perm(&selinux_state,
877 current_sid(), SECINITSID_SECURITY,
878 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
879 NULL);
880 if (length)
881 goto out;
882
883 length = -ENOMEM;
884 scon = kzalloc(size + 1, GFP_KERNEL);
885 if (!scon)
886 goto out;
887
888 length = -ENOMEM;
889 tcon = kzalloc(size + 1, GFP_KERNEL);
890 if (!tcon)
891 goto out;
892
893 length = -ENOMEM;
894 namebuf = kzalloc(size + 1, GFP_KERNEL);
895 if (!namebuf)
896 goto out;
897
898 length = -EINVAL;
899 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
900 if (nargs < 3 || nargs > 4)
901 goto out;
902 if (nargs == 4) {
903 /*
904 * If and when the name of new object to be queried contains
905 * either whitespace or multibyte characters, they shall be
906 * encoded based on the percentage-encoding rule.
907 * If not encoded, the sscanf logic picks up only left-half
908 * of the supplied name; splitted by a whitespace unexpectedly.
909 */
910 char *r, *w;
911 int c1, c2;
912
913 r = w = namebuf;
914 do {
915 c1 = *r++;
916 if (c1 == '+')
917 c1 = ' ';
918 else if (c1 == '%') {
919 c1 = hex_to_bin(*r++);
920 if (c1 < 0)
921 goto out;
922 c2 = hex_to_bin(*r++);
923 if (c2 < 0)
924 goto out;
925 c1 = (c1 << 4) | c2;
926 }
927 *w++ = c1;
928 } while (c1 != '\0');
929
930 objname = namebuf;
931 }
932
933 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
934 if (length)
935 goto out;
936
937 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
938 if (length)
939 goto out;
940
941 length = security_transition_sid_user(state, ssid, tsid, tclass,
942 objname, &newsid);
943 if (length)
944 goto out;
945
946 length = security_sid_to_context(state, newsid, &newcon, &len);
947 if (length)
948 goto out;
949
950 length = -ERANGE;
951 if (len > SIMPLE_TRANSACTION_LIMIT) {
952 pr_err("SELinux: %s: context size (%u) exceeds "
953 "payload max\n", __func__, len);
954 goto out;
955 }
956
957 memcpy(buf, newcon, len);
958 length = len;
959 out:
960 kfree(newcon);
961 kfree(namebuf);
962 kfree(tcon);
963 kfree(scon);
964 return length;
965 }
966
967 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
968 {
969 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
970 struct selinux_state *state = fsi->state;
971 char *scon = NULL, *tcon = NULL;
972 u32 ssid, tsid, newsid;
973 u16 tclass;
974 ssize_t length;
975 char *newcon = NULL;
976 u32 len;
977
978 length = avc_has_perm(&selinux_state,
979 current_sid(), SECINITSID_SECURITY,
980 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
981 NULL);
982 if (length)
983 goto out;
984
985 length = -ENOMEM;
986 scon = kzalloc(size + 1, GFP_KERNEL);
987 if (!scon)
988 goto out;
989
990 length = -ENOMEM;
991 tcon = kzalloc(size + 1, GFP_KERNEL);
992 if (!tcon)
993 goto out;
994
995 length = -EINVAL;
996 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
997 goto out;
998
999 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1000 if (length)
1001 goto out;
1002
1003 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1004 if (length)
1005 goto out;
1006
1007 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1008 if (length)
1009 goto out;
1010
1011 length = security_sid_to_context(state, newsid, &newcon, &len);
1012 if (length)
1013 goto out;
1014
1015 length = -ERANGE;
1016 if (len > SIMPLE_TRANSACTION_LIMIT)
1017 goto out;
1018
1019 memcpy(buf, newcon, len);
1020 length = len;
1021 out:
1022 kfree(newcon);
1023 kfree(tcon);
1024 kfree(scon);
1025 return length;
1026 }
1027
1028 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1029 {
1030 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1031 struct selinux_state *state = fsi->state;
1032 char *con = NULL, *user = NULL, *ptr;
1033 u32 sid, *sids = NULL;
1034 ssize_t length;
1035 char *newcon;
1036 int i, rc;
1037 u32 len, nsids;
1038
1039 length = avc_has_perm(&selinux_state,
1040 current_sid(), SECINITSID_SECURITY,
1041 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1042 NULL);
1043 if (length)
1044 goto out;
1045
1046 length = -ENOMEM;
1047 con = kzalloc(size + 1, GFP_KERNEL);
1048 if (!con)
1049 goto out;
1050
1051 length = -ENOMEM;
1052 user = kzalloc(size + 1, GFP_KERNEL);
1053 if (!user)
1054 goto out;
1055
1056 length = -EINVAL;
1057 if (sscanf(buf, "%s %s", con, user) != 2)
1058 goto out;
1059
1060 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1061 if (length)
1062 goto out;
1063
1064 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1065 if (length)
1066 goto out;
1067
1068 length = sprintf(buf, "%u", nsids) + 1;
1069 ptr = buf + length;
1070 for (i = 0; i < nsids; i++) {
1071 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1072 if (rc) {
1073 length = rc;
1074 goto out;
1075 }
1076 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1077 kfree(newcon);
1078 length = -ERANGE;
1079 goto out;
1080 }
1081 memcpy(ptr, newcon, len);
1082 kfree(newcon);
1083 ptr += len;
1084 length += len;
1085 }
1086 out:
1087 kfree(sids);
1088 kfree(user);
1089 kfree(con);
1090 return length;
1091 }
1092
1093 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1094 {
1095 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1096 struct selinux_state *state = fsi->state;
1097 char *scon = NULL, *tcon = NULL;
1098 u32 ssid, tsid, newsid;
1099 u16 tclass;
1100 ssize_t length;
1101 char *newcon = NULL;
1102 u32 len;
1103
1104 length = avc_has_perm(&selinux_state,
1105 current_sid(), SECINITSID_SECURITY,
1106 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1107 NULL);
1108 if (length)
1109 goto out;
1110
1111 length = -ENOMEM;
1112 scon = kzalloc(size + 1, GFP_KERNEL);
1113 if (!scon)
1114 goto out;
1115
1116 length = -ENOMEM;
1117 tcon = kzalloc(size + 1, GFP_KERNEL);
1118 if (!tcon)
1119 goto out;
1120
1121 length = -EINVAL;
1122 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1123 goto out;
1124
1125 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1126 if (length)
1127 goto out;
1128
1129 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1130 if (length)
1131 goto out;
1132
1133 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1134 if (length)
1135 goto out;
1136
1137 length = security_sid_to_context(state, newsid, &newcon, &len);
1138 if (length)
1139 goto out;
1140
1141 length = -ERANGE;
1142 if (len > SIMPLE_TRANSACTION_LIMIT) {
1143 pr_err("SELinux: %s: context size (%u) exceeds "
1144 "payload max\n", __func__, len);
1145 goto out;
1146 }
1147
1148 memcpy(buf, newcon, len);
1149 length = len;
1150 out:
1151 kfree(newcon);
1152 kfree(tcon);
1153 kfree(scon);
1154 return length;
1155 }
1156
1157 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1158 {
1159 struct inode *ret = new_inode(sb);
1160
1161 if (ret) {
1162 ret->i_mode = mode;
1163 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1164 }
1165 return ret;
1166 }
1167
1168 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1169 size_t count, loff_t *ppos)
1170 {
1171 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1172 char *page = NULL;
1173 ssize_t length;
1174 ssize_t ret;
1175 int cur_enforcing;
1176 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1177 const char *name = filep->f_path.dentry->d_name.name;
1178
1179 mutex_lock(&fsi->mutex);
1180
1181 ret = -EINVAL;
1182 if (index >= fsi->bool_num || strcmp(name,
1183 fsi->bool_pending_names[index]))
1184 goto out_unlock;
1185
1186 ret = -ENOMEM;
1187 page = (char *)get_zeroed_page(GFP_KERNEL);
1188 if (!page)
1189 goto out_unlock;
1190
1191 cur_enforcing = security_get_bool_value(fsi->state, index);
1192 if (cur_enforcing < 0) {
1193 ret = cur_enforcing;
1194 goto out_unlock;
1195 }
1196 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1197 fsi->bool_pending_values[index]);
1198 mutex_unlock(&fsi->mutex);
1199 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1200 out_free:
1201 free_page((unsigned long)page);
1202 return ret;
1203
1204 out_unlock:
1205 mutex_unlock(&fsi->mutex);
1206 goto out_free;
1207 }
1208
1209 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1210 size_t count, loff_t *ppos)
1211 {
1212 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1213 char *page = NULL;
1214 ssize_t length;
1215 int new_value;
1216 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1217 const char *name = filep->f_path.dentry->d_name.name;
1218
1219 if (count >= PAGE_SIZE)
1220 return -ENOMEM;
1221
1222 /* No partial writes. */
1223 if (*ppos != 0)
1224 return -EINVAL;
1225
1226 page = memdup_user_nul(buf, count);
1227 if (IS_ERR(page))
1228 return PTR_ERR(page);
1229
1230 mutex_lock(&fsi->mutex);
1231
1232 length = avc_has_perm(&selinux_state,
1233 current_sid(), SECINITSID_SECURITY,
1234 SECCLASS_SECURITY, SECURITY__SETBOOL,
1235 NULL);
1236 if (length)
1237 goto out;
1238
1239 length = -EINVAL;
1240 if (index >= fsi->bool_num || strcmp(name,
1241 fsi->bool_pending_names[index]))
1242 goto out;
1243
1244 length = -EINVAL;
1245 if (sscanf(page, "%d", &new_value) != 1)
1246 goto out;
1247
1248 if (new_value)
1249 new_value = 1;
1250
1251 fsi->bool_pending_values[index] = new_value;
1252 length = count;
1253
1254 out:
1255 mutex_unlock(&fsi->mutex);
1256 kfree(page);
1257 return length;
1258 }
1259
1260 static const struct file_operations sel_bool_ops = {
1261 .read = sel_read_bool,
1262 .write = sel_write_bool,
1263 .llseek = generic_file_llseek,
1264 };
1265
1266 static ssize_t sel_commit_bools_write(struct file *filep,
1267 const char __user *buf,
1268 size_t count, loff_t *ppos)
1269 {
1270 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1271 char *page = NULL;
1272 ssize_t length;
1273 int new_value;
1274
1275 if (count >= PAGE_SIZE)
1276 return -ENOMEM;
1277
1278 /* No partial writes. */
1279 if (*ppos != 0)
1280 return -EINVAL;
1281
1282 page = memdup_user_nul(buf, count);
1283 if (IS_ERR(page))
1284 return PTR_ERR(page);
1285
1286 mutex_lock(&fsi->mutex);
1287
1288 length = avc_has_perm(&selinux_state,
1289 current_sid(), SECINITSID_SECURITY,
1290 SECCLASS_SECURITY, SECURITY__SETBOOL,
1291 NULL);
1292 if (length)
1293 goto out;
1294
1295 length = -EINVAL;
1296 if (sscanf(page, "%d", &new_value) != 1)
1297 goto out;
1298
1299 length = 0;
1300 if (new_value && fsi->bool_pending_values)
1301 length = security_set_bools(fsi->state, fsi->bool_num,
1302 fsi->bool_pending_values);
1303
1304 if (!length)
1305 length = count;
1306
1307 out:
1308 mutex_unlock(&fsi->mutex);
1309 kfree(page);
1310 return length;
1311 }
1312
1313 static const struct file_operations sel_commit_bools_ops = {
1314 .write = sel_commit_bools_write,
1315 .llseek = generic_file_llseek,
1316 };
1317
1318 static void sel_remove_entries(struct dentry *de)
1319 {
1320 d_genocide(de);
1321 shrink_dcache_parent(de);
1322 }
1323
1324 #define BOOL_DIR_NAME "booleans"
1325
1326 static int sel_make_bools(struct selinux_fs_info *fsi)
1327 {
1328 int i, ret;
1329 ssize_t len;
1330 struct dentry *dentry = NULL;
1331 struct dentry *dir = fsi->bool_dir;
1332 struct inode *inode = NULL;
1333 struct inode_security_struct *isec;
1334 char **names = NULL, *page;
1335 int num;
1336 int *values = NULL;
1337 u32 sid;
1338
1339 /* remove any existing files */
1340 for (i = 0; i < fsi->bool_num; i++)
1341 kfree(fsi->bool_pending_names[i]);
1342 kfree(fsi->bool_pending_names);
1343 kfree(fsi->bool_pending_values);
1344 fsi->bool_num = 0;
1345 fsi->bool_pending_names = NULL;
1346 fsi->bool_pending_values = NULL;
1347
1348 sel_remove_entries(dir);
1349
1350 ret = -ENOMEM;
1351 page = (char *)get_zeroed_page(GFP_KERNEL);
1352 if (!page)
1353 goto out;
1354
1355 ret = security_get_bools(fsi->state, &num, &names, &values);
1356 if (ret)
1357 goto out;
1358
1359 for (i = 0; i < num; i++) {
1360 ret = -ENOMEM;
1361 dentry = d_alloc_name(dir, names[i]);
1362 if (!dentry)
1363 goto out;
1364
1365 ret = -ENOMEM;
1366 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1367 if (!inode) {
1368 dput(dentry);
1369 goto out;
1370 }
1371
1372 ret = -ENAMETOOLONG;
1373 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1374 if (len >= PAGE_SIZE) {
1375 dput(dentry);
1376 iput(inode);
1377 goto out;
1378 }
1379
1380 isec = selinux_inode(inode);
1381 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1382 SECCLASS_FILE, &sid);
1383 if (ret) {
1384 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1385 page);
1386 sid = SECINITSID_SECURITY;
1387 }
1388
1389 isec->sid = sid;
1390 isec->initialized = LABEL_INITIALIZED;
1391 inode->i_fop = &sel_bool_ops;
1392 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1393 d_add(dentry, inode);
1394 }
1395 fsi->bool_num = num;
1396 fsi->bool_pending_names = names;
1397 fsi->bool_pending_values = values;
1398
1399 free_page((unsigned long)page);
1400 return 0;
1401 out:
1402 free_page((unsigned long)page);
1403
1404 if (names) {
1405 for (i = 0; i < num; i++)
1406 kfree(names[i]);
1407 kfree(names);
1408 }
1409 kfree(values);
1410 sel_remove_entries(dir);
1411
1412 return ret;
1413 }
1414
1415 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1416 size_t count, loff_t *ppos)
1417 {
1418 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1419 struct selinux_state *state = fsi->state;
1420 char tmpbuf[TMPBUFLEN];
1421 ssize_t length;
1422
1423 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1424 avc_get_cache_threshold(state->avc));
1425 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1426 }
1427
1428 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1429 const char __user *buf,
1430 size_t count, loff_t *ppos)
1431
1432 {
1433 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1434 struct selinux_state *state = fsi->state;
1435 char *page;
1436 ssize_t ret;
1437 unsigned int new_value;
1438
1439 ret = avc_has_perm(&selinux_state,
1440 current_sid(), SECINITSID_SECURITY,
1441 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1442 NULL);
1443 if (ret)
1444 return ret;
1445
1446 if (count >= PAGE_SIZE)
1447 return -ENOMEM;
1448
1449 /* No partial writes. */
1450 if (*ppos != 0)
1451 return -EINVAL;
1452
1453 page = memdup_user_nul(buf, count);
1454 if (IS_ERR(page))
1455 return PTR_ERR(page);
1456
1457 ret = -EINVAL;
1458 if (sscanf(page, "%u", &new_value) != 1)
1459 goto out;
1460
1461 avc_set_cache_threshold(state->avc, new_value);
1462
1463 ret = count;
1464 out:
1465 kfree(page);
1466 return ret;
1467 }
1468
1469 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1470 size_t count, loff_t *ppos)
1471 {
1472 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1473 struct selinux_state *state = fsi->state;
1474 char *page;
1475 ssize_t length;
1476
1477 page = (char *)__get_free_page(GFP_KERNEL);
1478 if (!page)
1479 return -ENOMEM;
1480
1481 length = avc_get_hash_stats(state->avc, page);
1482 if (length >= 0)
1483 length = simple_read_from_buffer(buf, count, ppos, page, length);
1484 free_page((unsigned long)page);
1485
1486 return length;
1487 }
1488
1489 static const struct file_operations sel_avc_cache_threshold_ops = {
1490 .read = sel_read_avc_cache_threshold,
1491 .write = sel_write_avc_cache_threshold,
1492 .llseek = generic_file_llseek,
1493 };
1494
1495 static const struct file_operations sel_avc_hash_stats_ops = {
1496 .read = sel_read_avc_hash_stats,
1497 .llseek = generic_file_llseek,
1498 };
1499
1500 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1501 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1502 {
1503 int cpu;
1504
1505 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1506 if (!cpu_possible(cpu))
1507 continue;
1508 *idx = cpu + 1;
1509 return &per_cpu(avc_cache_stats, cpu);
1510 }
1511 return NULL;
1512 }
1513
1514 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1515 {
1516 loff_t n = *pos - 1;
1517
1518 if (*pos == 0)
1519 return SEQ_START_TOKEN;
1520
1521 return sel_avc_get_stat_idx(&n);
1522 }
1523
1524 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1525 {
1526 return sel_avc_get_stat_idx(pos);
1527 }
1528
1529 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1530 {
1531 struct avc_cache_stats *st = v;
1532
1533 if (v == SEQ_START_TOKEN) {
1534 seq_puts(seq,
1535 "lookups hits misses allocations reclaims frees\n");
1536 } else {
1537 unsigned int lookups = st->lookups;
1538 unsigned int misses = st->misses;
1539 unsigned int hits = lookups - misses;
1540 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1541 hits, misses, st->allocations,
1542 st->reclaims, st->frees);
1543 }
1544 return 0;
1545 }
1546
1547 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1548 { }
1549
1550 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1551 .start = sel_avc_stats_seq_start,
1552 .next = sel_avc_stats_seq_next,
1553 .show = sel_avc_stats_seq_show,
1554 .stop = sel_avc_stats_seq_stop,
1555 };
1556
1557 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1558 {
1559 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1560 }
1561
1562 static const struct file_operations sel_avc_cache_stats_ops = {
1563 .open = sel_open_avc_cache_stats,
1564 .read = seq_read,
1565 .llseek = seq_lseek,
1566 .release = seq_release,
1567 };
1568 #endif
1569
1570 static int sel_make_avc_files(struct dentry *dir)
1571 {
1572 struct super_block *sb = dir->d_sb;
1573 struct selinux_fs_info *fsi = sb->s_fs_info;
1574 int i;
1575 static const struct tree_descr files[] = {
1576 { "cache_threshold",
1577 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1578 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1579 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1580 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1581 #endif
1582 };
1583
1584 for (i = 0; i < ARRAY_SIZE(files); i++) {
1585 struct inode *inode;
1586 struct dentry *dentry;
1587
1588 dentry = d_alloc_name(dir, files[i].name);
1589 if (!dentry)
1590 return -ENOMEM;
1591
1592 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1593 if (!inode) {
1594 dput(dentry);
1595 return -ENOMEM;
1596 }
1597
1598 inode->i_fop = files[i].ops;
1599 inode->i_ino = ++fsi->last_ino;
1600 d_add(dentry, inode);
1601 }
1602
1603 return 0;
1604 }
1605
1606 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1607 size_t count, loff_t *ppos)
1608 {
1609 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1610 char *con;
1611 u32 sid, len;
1612 ssize_t ret;
1613
1614 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1615 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1616 if (ret)
1617 return ret;
1618
1619 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1620 kfree(con);
1621 return ret;
1622 }
1623
1624 static const struct file_operations sel_initcon_ops = {
1625 .read = sel_read_initcon,
1626 .llseek = generic_file_llseek,
1627 };
1628
1629 static int sel_make_initcon_files(struct dentry *dir)
1630 {
1631 int i;
1632
1633 for (i = 1; i <= SECINITSID_NUM; i++) {
1634 struct inode *inode;
1635 struct dentry *dentry;
1636 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1637 if (!dentry)
1638 return -ENOMEM;
1639
1640 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1641 if (!inode) {
1642 dput(dentry);
1643 return -ENOMEM;
1644 }
1645
1646 inode->i_fop = &sel_initcon_ops;
1647 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1648 d_add(dentry, inode);
1649 }
1650
1651 return 0;
1652 }
1653
1654 static inline unsigned long sel_class_to_ino(u16 class)
1655 {
1656 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1657 }
1658
1659 static inline u16 sel_ino_to_class(unsigned long ino)
1660 {
1661 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1662 }
1663
1664 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1665 {
1666 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1667 }
1668
1669 static inline u32 sel_ino_to_perm(unsigned long ino)
1670 {
1671 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1672 }
1673
1674 static ssize_t sel_read_class(struct file *file, char __user *buf,
1675 size_t count, loff_t *ppos)
1676 {
1677 unsigned long ino = file_inode(file)->i_ino;
1678 char res[TMPBUFLEN];
1679 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1680 return simple_read_from_buffer(buf, count, ppos, res, len);
1681 }
1682
1683 static const struct file_operations sel_class_ops = {
1684 .read = sel_read_class,
1685 .llseek = generic_file_llseek,
1686 };
1687
1688 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1689 size_t count, loff_t *ppos)
1690 {
1691 unsigned long ino = file_inode(file)->i_ino;
1692 char res[TMPBUFLEN];
1693 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1694 return simple_read_from_buffer(buf, count, ppos, res, len);
1695 }
1696
1697 static const struct file_operations sel_perm_ops = {
1698 .read = sel_read_perm,
1699 .llseek = generic_file_llseek,
1700 };
1701
1702 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1703 size_t count, loff_t *ppos)
1704 {
1705 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1706 int value;
1707 char tmpbuf[TMPBUFLEN];
1708 ssize_t length;
1709 unsigned long i_ino = file_inode(file)->i_ino;
1710
1711 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1712 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1713
1714 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1715 }
1716
1717 static const struct file_operations sel_policycap_ops = {
1718 .read = sel_read_policycap,
1719 .llseek = generic_file_llseek,
1720 };
1721
1722 static int sel_make_perm_files(char *objclass, int classvalue,
1723 struct dentry *dir)
1724 {
1725 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1726 int i, rc, nperms;
1727 char **perms;
1728
1729 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1730 if (rc)
1731 return rc;
1732
1733 for (i = 0; i < nperms; i++) {
1734 struct inode *inode;
1735 struct dentry *dentry;
1736
1737 rc = -ENOMEM;
1738 dentry = d_alloc_name(dir, perms[i]);
1739 if (!dentry)
1740 goto out;
1741
1742 rc = -ENOMEM;
1743 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1744 if (!inode) {
1745 dput(dentry);
1746 goto out;
1747 }
1748
1749 inode->i_fop = &sel_perm_ops;
1750 /* i+1 since perm values are 1-indexed */
1751 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1752 d_add(dentry, inode);
1753 }
1754 rc = 0;
1755 out:
1756 for (i = 0; i < nperms; i++)
1757 kfree(perms[i]);
1758 kfree(perms);
1759 return rc;
1760 }
1761
1762 static int sel_make_class_dir_entries(char *classname, int index,
1763 struct dentry *dir)
1764 {
1765 struct super_block *sb = dir->d_sb;
1766 struct selinux_fs_info *fsi = sb->s_fs_info;
1767 struct dentry *dentry = NULL;
1768 struct inode *inode = NULL;
1769 int rc;
1770
1771 dentry = d_alloc_name(dir, "index");
1772 if (!dentry)
1773 return -ENOMEM;
1774
1775 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1776 if (!inode) {
1777 dput(dentry);
1778 return -ENOMEM;
1779 }
1780
1781 inode->i_fop = &sel_class_ops;
1782 inode->i_ino = sel_class_to_ino(index);
1783 d_add(dentry, inode);
1784
1785 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1786 if (IS_ERR(dentry))
1787 return PTR_ERR(dentry);
1788
1789 rc = sel_make_perm_files(classname, index, dentry);
1790
1791 return rc;
1792 }
1793
1794 static int sel_make_classes(struct selinux_fs_info *fsi)
1795 {
1796
1797 int rc, nclasses, i;
1798 char **classes;
1799
1800 /* delete any existing entries */
1801 sel_remove_entries(fsi->class_dir);
1802
1803 rc = security_get_classes(fsi->state, &classes, &nclasses);
1804 if (rc)
1805 return rc;
1806
1807 /* +2 since classes are 1-indexed */
1808 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1809
1810 for (i = 0; i < nclasses; i++) {
1811 struct dentry *class_name_dir;
1812
1813 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1814 &fsi->last_class_ino);
1815 if (IS_ERR(class_name_dir)) {
1816 rc = PTR_ERR(class_name_dir);
1817 goto out;
1818 }
1819
1820 /* i+1 since class values are 1-indexed */
1821 rc = sel_make_class_dir_entries(classes[i], i + 1,
1822 class_name_dir);
1823 if (rc)
1824 goto out;
1825 }
1826 rc = 0;
1827 out:
1828 for (i = 0; i < nclasses; i++)
1829 kfree(classes[i]);
1830 kfree(classes);
1831 return rc;
1832 }
1833
1834 static int sel_make_policycap(struct selinux_fs_info *fsi)
1835 {
1836 unsigned int iter;
1837 struct dentry *dentry = NULL;
1838 struct inode *inode = NULL;
1839
1840 sel_remove_entries(fsi->policycap_dir);
1841
1842 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1843 if (iter < ARRAY_SIZE(selinux_policycap_names))
1844 dentry = d_alloc_name(fsi->policycap_dir,
1845 selinux_policycap_names[iter]);
1846 else
1847 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1848
1849 if (dentry == NULL)
1850 return -ENOMEM;
1851
1852 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1853 if (inode == NULL) {
1854 dput(dentry);
1855 return -ENOMEM;
1856 }
1857
1858 inode->i_fop = &sel_policycap_ops;
1859 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1860 d_add(dentry, inode);
1861 }
1862
1863 return 0;
1864 }
1865
1866 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1867 unsigned long *ino)
1868 {
1869 struct dentry *dentry = d_alloc_name(dir, name);
1870 struct inode *inode;
1871
1872 if (!dentry)
1873 return ERR_PTR(-ENOMEM);
1874
1875 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1876 if (!inode) {
1877 dput(dentry);
1878 return ERR_PTR(-ENOMEM);
1879 }
1880
1881 inode->i_op = &simple_dir_inode_operations;
1882 inode->i_fop = &simple_dir_operations;
1883 inode->i_ino = ++(*ino);
1884 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1885 inc_nlink(inode);
1886 d_add(dentry, inode);
1887 /* bump link count on parent directory, too */
1888 inc_nlink(d_inode(dir));
1889
1890 return dentry;
1891 }
1892
1893 #define NULL_FILE_NAME "null"
1894
1895 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1896 {
1897 struct selinux_fs_info *fsi;
1898 int ret;
1899 struct dentry *dentry;
1900 struct inode *inode;
1901 struct inode_security_struct *isec;
1902
1903 static const struct tree_descr selinux_files[] = {
1904 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1905 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1906 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1907 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1908 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1909 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1910 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1911 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1912 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1913 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1914 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1915 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1916 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1917 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1918 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1919 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1920 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1921 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1922 S_IWUGO},
1923 /* last one */ {""}
1924 };
1925
1926 ret = selinux_fs_info_create(sb);
1927 if (ret)
1928 goto err;
1929
1930 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1931 if (ret)
1932 goto err;
1933
1934 fsi = sb->s_fs_info;
1935 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
1936 if (IS_ERR(fsi->bool_dir)) {
1937 ret = PTR_ERR(fsi->bool_dir);
1938 fsi->bool_dir = NULL;
1939 goto err;
1940 }
1941
1942 ret = -ENOMEM;
1943 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1944 if (!dentry)
1945 goto err;
1946
1947 ret = -ENOMEM;
1948 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1949 if (!inode) {
1950 dput(dentry);
1951 goto err;
1952 }
1953
1954 inode->i_ino = ++fsi->last_ino;
1955 isec = selinux_inode(inode);
1956 isec->sid = SECINITSID_DEVNULL;
1957 isec->sclass = SECCLASS_CHR_FILE;
1958 isec->initialized = LABEL_INITIALIZED;
1959
1960 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1961 d_add(dentry, inode);
1962
1963 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
1964 if (IS_ERR(dentry)) {
1965 ret = PTR_ERR(dentry);
1966 goto err;
1967 }
1968
1969 ret = sel_make_avc_files(dentry);
1970 if (ret)
1971 goto err;
1972
1973 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
1974 if (IS_ERR(dentry)) {
1975 ret = PTR_ERR(dentry);
1976 goto err;
1977 }
1978
1979 ret = sel_make_initcon_files(dentry);
1980 if (ret)
1981 goto err;
1982
1983 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
1984 if (IS_ERR(fsi->class_dir)) {
1985 ret = PTR_ERR(fsi->class_dir);
1986 fsi->class_dir = NULL;
1987 goto err;
1988 }
1989
1990 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
1991 &fsi->last_ino);
1992 if (IS_ERR(fsi->policycap_dir)) {
1993 ret = PTR_ERR(fsi->policycap_dir);
1994 fsi->policycap_dir = NULL;
1995 goto err;
1996 }
1997
1998 ret = sel_make_policy_nodes(fsi);
1999 if (ret)
2000 goto err;
2001 return 0;
2002 err:
2003 pr_err("SELinux: %s: failed while creating inodes\n",
2004 __func__);
2005
2006 selinux_fs_info_free(sb);
2007
2008 return ret;
2009 }
2010
2011 static int sel_get_tree(struct fs_context *fc)
2012 {
2013 return get_tree_single(fc, sel_fill_super);
2014 }
2015
2016 static const struct fs_context_operations sel_context_ops = {
2017 .get_tree = sel_get_tree,
2018 };
2019
2020 static int sel_init_fs_context(struct fs_context *fc)
2021 {
2022 fc->ops = &sel_context_ops;
2023 return 0;
2024 }
2025
2026 static void sel_kill_sb(struct super_block *sb)
2027 {
2028 selinux_fs_info_free(sb);
2029 kill_litter_super(sb);
2030 }
2031
2032 static struct file_system_type sel_fs_type = {
2033 .name = "selinuxfs",
2034 .init_fs_context = sel_init_fs_context,
2035 .kill_sb = sel_kill_sb,
2036 };
2037
2038 struct vfsmount *selinuxfs_mount;
2039 struct path selinux_null;
2040
2041 static int __init init_sel_fs(void)
2042 {
2043 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2044 sizeof(NULL_FILE_NAME)-1);
2045 int err;
2046
2047 if (!selinux_enabled)
2048 return 0;
2049
2050 err = sysfs_create_mount_point(fs_kobj, "selinux");
2051 if (err)
2052 return err;
2053
2054 err = register_filesystem(&sel_fs_type);
2055 if (err) {
2056 sysfs_remove_mount_point(fs_kobj, "selinux");
2057 return err;
2058 }
2059
2060 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2061 if (IS_ERR(selinuxfs_mount)) {
2062 pr_err("selinuxfs: could not mount!\n");
2063 err = PTR_ERR(selinuxfs_mount);
2064 selinuxfs_mount = NULL;
2065 }
2066 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2067 &null_name);
2068 if (IS_ERR(selinux_null.dentry)) {
2069 pr_err("selinuxfs: could not lookup null!\n");
2070 err = PTR_ERR(selinux_null.dentry);
2071 selinux_null.dentry = NULL;
2072 }
2073
2074 return err;
2075 }
2076
2077 __initcall(init_sel_fs);
2078
2079 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2080 void exit_sel_fs(void)
2081 {
2082 sysfs_remove_mount_point(fs_kobj, "selinux");
2083 dput(selinux_null.dentry);
2084 kern_unmount(selinuxfs_mount);
2085 unregister_filesystem(&sel_fs_type);
2086 }
2087 #endif
Linux with added FPC-III support