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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
36
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
45enum sel_inos {
46 SEL_ROOT_INO = 2,
47 SEL_LOAD,
48 SEL_ENFORCE,
49 SEL_CONTEXT,
50 SEL_ACCESS,
51 SEL_CREATE,
52 SEL_RELABEL,
53 SEL_USER,
54 SEL_POLICYVERS,
55 SEL_COMMIT_BOOLS,
56 SEL_MLS,
57 SEL_DISABLE,
58 SEL_MEMBER,
59 SEL_CHECKREQPROT,
60 SEL_COMPAT_NET,
61 SEL_REJECT_UNKNOWN,
62 SEL_DENY_UNKNOWN,
63 SEL_STATUS,
64 SEL_POLICY,
65 SEL_VALIDATE_TRANS,
66 SEL_INO_NEXT,
67};
68
69struct 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
84static 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
100static 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
122static 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
135static 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
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(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
171 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
172 new_value, old_value,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 enforcing_set(state, new_value);
176 if (new_value)
177 avc_ss_reset(state->avc, 0);
178 selnl_notify_setenforce(new_value);
179 selinux_status_update_setenforce(state, new_value);
180 if (!new_value)
181 call_lsm_notifier(LSM_POLICY_CHANGE, NULL);
182 }
183 length = count;
184out:
185 kfree(page);
186 return length;
187}
188#else
189#define sel_write_enforce NULL
190#endif
191
192static const struct file_operations sel_enforce_ops = {
193 .read = sel_read_enforce,
194 .write = sel_write_enforce,
195 .llseek = generic_file_llseek,
196};
197
198static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
200{
201 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
202 struct selinux_state *state = fsi->state;
203 char tmpbuf[TMPBUFLEN];
204 ssize_t length;
205 ino_t ino = file_inode(filp)->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown(state) :
208 !security_get_allow_unknown(state);
209
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212}
213
214static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 .llseek = generic_file_llseek,
217};
218
219static int sel_open_handle_status(struct inode *inode, struct file *filp)
220{
221 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
222 struct page *status = selinux_kernel_status_page(fsi->state);
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230}
231
232static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234{
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242}
243
244static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246{
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264}
265
266static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271};
272
273#ifdef CONFIG_SECURITY_SELINUX_DISABLE
274static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277{
278 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
279 char *page;
280 ssize_t length;
281 int new_value;
282
283 if (count >= PAGE_SIZE)
284 return -ENOMEM;
285
286
287 if (*ppos != 0)
288 return -EINVAL;
289
290 page = memdup_user_nul(buf, count);
291 if (IS_ERR(page))
292 return PTR_ERR(page);
293
294 length = -EINVAL;
295 if (sscanf(page, "%d", &new_value) != 1)
296 goto out;
297
298 if (new_value) {
299 length = selinux_disable(fsi->state);
300 if (length)
301 goto out;
302 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
303 "selinux=0 auid=%u ses=%u",
304 from_kuid(&init_user_ns, audit_get_loginuid(current)),
305 audit_get_sessionid(current));
306 }
307
308 length = count;
309out:
310 kfree(page);
311 return length;
312}
313#else
314#define sel_write_disable NULL
315#endif
316
317static const struct file_operations sel_disable_ops = {
318 .write = sel_write_disable,
319 .llseek = generic_file_llseek,
320};
321
322static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
323 size_t count, loff_t *ppos)
324{
325 char tmpbuf[TMPBUFLEN];
326 ssize_t length;
327
328 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
329 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
330}
331
332static const struct file_operations sel_policyvers_ops = {
333 .read = sel_read_policyvers,
334 .llseek = generic_file_llseek,
335};
336
337
338static int sel_make_bools(struct selinux_fs_info *fsi);
339static int sel_make_classes(struct selinux_fs_info *fsi);
340static int sel_make_policycap(struct selinux_fs_info *fsi);
341
342
343static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
344 unsigned long *ino);
345
346static ssize_t sel_read_mls(struct file *filp, char __user *buf,
347 size_t count, loff_t *ppos)
348{
349 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
350 char tmpbuf[TMPBUFLEN];
351 ssize_t length;
352
353 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
354 security_mls_enabled(fsi->state));
355 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
356}
357
358static const struct file_operations sel_mls_ops = {
359 .read = sel_read_mls,
360 .llseek = generic_file_llseek,
361};
362
363struct policy_load_memory {
364 size_t len;
365 void *data;
366};
367
368static int sel_open_policy(struct inode *inode, struct file *filp)
369{
370 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
371 struct selinux_state *state = fsi->state;
372 struct policy_load_memory *plm = NULL;
373 int rc;
374
375 BUG_ON(filp->private_data);
376
377 mutex_lock(&fsi->mutex);
378
379 rc = avc_has_perm(&selinux_state,
380 current_sid(), SECINITSID_SECURITY,
381 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
382 if (rc)
383 goto err;
384
385 rc = -EBUSY;
386 if (fsi->policy_opened)
387 goto err;
388
389 rc = -ENOMEM;
390 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
391 if (!plm)
392 goto err;
393
394 if (i_size_read(inode) != security_policydb_len(state)) {
395 inode_lock(inode);
396 i_size_write(inode, security_policydb_len(state));
397 inode_unlock(inode);
398 }
399
400 rc = security_read_policy(state, &plm->data, &plm->len);
401 if (rc)
402 goto err;
403
404 fsi->policy_opened = 1;
405
406 filp->private_data = plm;
407
408 mutex_unlock(&fsi->mutex);
409
410 return 0;
411err:
412 mutex_unlock(&fsi->mutex);
413
414 if (plm)
415 vfree(plm->data);
416 kfree(plm);
417 return rc;
418}
419
420static int sel_release_policy(struct inode *inode, struct file *filp)
421{
422 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
423 struct policy_load_memory *plm = filp->private_data;
424
425 BUG_ON(!plm);
426
427 fsi->policy_opened = 0;
428
429 vfree(plm->data);
430 kfree(plm);
431
432 return 0;
433}
434
435static ssize_t sel_read_policy(struct file *filp, char __user *buf,
436 size_t count, loff_t *ppos)
437{
438 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
439 struct policy_load_memory *plm = filp->private_data;
440 int ret;
441
442 mutex_lock(&fsi->mutex);
443
444 ret = avc_has_perm(&selinux_state,
445 current_sid(), SECINITSID_SECURITY,
446 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
447 if (ret)
448 goto out;
449
450 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
451out:
452 mutex_unlock(&fsi->mutex);
453 return ret;
454}
455
456static int 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
477static const struct vm_operations_struct sel_mmap_policy_ops = {
478 .fault = sel_mmap_policy_fault,
479 .page_mkwrite = sel_mmap_policy_fault,
480};
481
482static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
483{
484 if (vma->vm_flags & VM_SHARED) {
485
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
498static 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
506static 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
531static 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
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
577out1:
578 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
579 "policy loaded auid=%u ses=%u",
580 from_kuid(&init_user_ns, audit_get_loginuid(current)),
581 audit_get_sessionid(current));
582out:
583 mutex_unlock(&fsi->mutex);
584 vfree(data);
585 return length;
586}
587
588static const struct file_operations sel_load_ops = {
589 .write = sel_write_load,
590 .llseek = generic_file_llseek,
591};
592
593static 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 printk(KERN_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;
624out:
625 kfree(canon);
626 return length;
627}
628
629static 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
640static 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
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;
672out:
673 kfree(page);
674 return length;
675}
676static const struct file_operations sel_checkreqprot_ops = {
677 .read = sel_read_checkreqprot,
678 .write = sel_write_checkreqprot,
679 .llseek = generic_file_llseek,
680};
681
682static 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
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;
748out:
749 kfree(req);
750 kfree(oldcon);
751 kfree(newcon);
752 kfree(taskcon);
753 return rc;
754}
755
756static const struct file_operations sel_transition_ops = {
757 .write = sel_write_validatetrans,
758 .llseek = generic_file_llseek,
759};
760
761
762
763
764static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
765static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
766static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
767static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
768static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
769
770static ssize_t (*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
779static 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
800static 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
809
810
811
812
813static 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);
858out:
859 kfree(tcon);
860 kfree(scon);
861 return length;
862}
863
864static 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
906
907
908
909
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 printk(KERN_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;
960out:
961 kfree(newcon);
962 kfree(namebuf);
963 kfree(tcon);
964 kfree(scon);
965 return length;
966}
967
968static 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;
1022out:
1023 kfree(newcon);
1024 kfree(tcon);
1025 kfree(scon);
1026 return length;
1027}
1028
1029static 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 }
1087out:
1088 kfree(sids);
1089 kfree(user);
1090 kfree(con);
1091 return length;
1092}
1093
1094static 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 printk(KERN_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;
1151out:
1152 kfree(newcon);
1153 kfree(tcon);
1154 kfree(scon);
1155 return length;
1156}
1157
1158static 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
1169static 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;
1186
1187 ret = -ENOMEM;
1188 page = (char *)get_zeroed_page(GFP_KERNEL);
1189 if (!page)
1190 goto out;
1191
1192 cur_enforcing = security_get_bool_value(fsi->state, index);
1193 if (cur_enforcing < 0) {
1194 ret = cur_enforcing;
1195 goto out;
1196 }
1197 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1198 fsi->bool_pending_values[index]);
1199 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1200out:
1201 mutex_unlock(&fsi->mutex);
1202 free_page((unsigned long)page);
1203 return ret;
1204}
1205
1206static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1207 size_t count, loff_t *ppos)
1208{
1209 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1210 char *page = NULL;
1211 ssize_t length;
1212 int new_value;
1213 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1214 const char *name = filep->f_path.dentry->d_name.name;
1215
1216 mutex_lock(&fsi->mutex);
1217
1218 length = avc_has_perm(&selinux_state,
1219 current_sid(), SECINITSID_SECURITY,
1220 SECCLASS_SECURITY, SECURITY__SETBOOL,
1221 NULL);
1222 if (length)
1223 goto out;
1224
1225 length = -EINVAL;
1226 if (index >= fsi->bool_num || strcmp(name,
1227 fsi->bool_pending_names[index]))
1228 goto out;
1229
1230 length = -ENOMEM;
1231 if (count >= PAGE_SIZE)
1232 goto out;
1233
1234
1235 length = -EINVAL;
1236 if (*ppos != 0)
1237 goto out;
1238
1239 page = memdup_user_nul(buf, count);
1240 if (IS_ERR(page)) {
1241 length = PTR_ERR(page);
1242 page = NULL;
1243 goto out;
1244 }
1245
1246 length = -EINVAL;
1247 if (sscanf(page, "%d", &new_value) != 1)
1248 goto out;
1249
1250 if (new_value)
1251 new_value = 1;
1252
1253 fsi->bool_pending_values[index] = new_value;
1254 length = count;
1255
1256out:
1257 mutex_unlock(&fsi->mutex);
1258 kfree(page);
1259 return length;
1260}
1261
1262static const struct file_operations sel_bool_ops = {
1263 .read = sel_read_bool,
1264 .write = sel_write_bool,
1265 .llseek = generic_file_llseek,
1266};
1267
1268static ssize_t sel_commit_bools_write(struct file *filep,
1269 const char __user *buf,
1270 size_t count, loff_t *ppos)
1271{
1272 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1273 char *page = NULL;
1274 ssize_t length;
1275 int new_value;
1276
1277 mutex_lock(&fsi->mutex);
1278
1279 length = avc_has_perm(&selinux_state,
1280 current_sid(), SECINITSID_SECURITY,
1281 SECCLASS_SECURITY, SECURITY__SETBOOL,
1282 NULL);
1283 if (length)
1284 goto out;
1285
1286 length = -ENOMEM;
1287 if (count >= PAGE_SIZE)
1288 goto out;
1289
1290
1291 length = -EINVAL;
1292 if (*ppos != 0)
1293 goto out;
1294
1295 page = memdup_user_nul(buf, count);
1296 if (IS_ERR(page)) {
1297 length = PTR_ERR(page);
1298 page = NULL;
1299 goto out;
1300 }
1301
1302 length = -EINVAL;
1303 if (sscanf(page, "%d", &new_value) != 1)
1304 goto out;
1305
1306 length = 0;
1307 if (new_value && fsi->bool_pending_values)
1308 length = security_set_bools(fsi->state, fsi->bool_num,
1309 fsi->bool_pending_values);
1310
1311 if (!length)
1312 length = count;
1313
1314out:
1315 mutex_unlock(&fsi->mutex);
1316 kfree(page);
1317 return length;
1318}
1319
1320static const struct file_operations sel_commit_bools_ops = {
1321 .write = sel_commit_bools_write,
1322 .llseek = generic_file_llseek,
1323};
1324
1325static void sel_remove_entries(struct dentry *de)
1326{
1327 d_genocide(de);
1328 shrink_dcache_parent(de);
1329}
1330
1331#define BOOL_DIR_NAME "booleans"
1332
1333static int sel_make_bools(struct selinux_fs_info *fsi)
1334{
1335 int i, ret;
1336 ssize_t len;
1337 struct dentry *dentry = NULL;
1338 struct dentry *dir = fsi->bool_dir;
1339 struct inode *inode = NULL;
1340 struct inode_security_struct *isec;
1341 char **names = NULL, *page;
1342 int num;
1343 int *values = NULL;
1344 u32 sid;
1345
1346
1347 for (i = 0; i < fsi->bool_num; i++)
1348 kfree(fsi->bool_pending_names[i]);
1349 kfree(fsi->bool_pending_names);
1350 kfree(fsi->bool_pending_values);
1351 fsi->bool_num = 0;
1352 fsi->bool_pending_names = NULL;
1353 fsi->bool_pending_values = NULL;
1354
1355 sel_remove_entries(dir);
1356
1357 ret = -ENOMEM;
1358 page = (char *)get_zeroed_page(GFP_KERNEL);
1359 if (!page)
1360 goto out;
1361
1362 ret = security_get_bools(fsi->state, &num, &names, &values);
1363 if (ret)
1364 goto out;
1365
1366 for (i = 0; i < num; i++) {
1367 ret = -ENOMEM;
1368 dentry = d_alloc_name(dir, names[i]);
1369 if (!dentry)
1370 goto out;
1371
1372 ret = -ENOMEM;
1373 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1374 if (!inode)
1375 goto out;
1376
1377 ret = -ENAMETOOLONG;
1378 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1379 if (len >= PAGE_SIZE)
1380 goto out;
1381
1382 isec = (struct inode_security_struct *)inode->i_security;
1383 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1384 SECCLASS_FILE, &sid);
1385 if (ret) {
1386 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1387 page);
1388 sid = SECINITSID_SECURITY;
1389 }
1390
1391 isec->sid = sid;
1392 isec->initialized = LABEL_INITIALIZED;
1393 inode->i_fop = &sel_bool_ops;
1394 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1395 d_add(dentry, inode);
1396 }
1397 fsi->bool_num = num;
1398 fsi->bool_pending_names = names;
1399 fsi->bool_pending_values = values;
1400
1401 free_page((unsigned long)page);
1402 return 0;
1403out:
1404 free_page((unsigned long)page);
1405
1406 if (names) {
1407 for (i = 0; i < num; i++)
1408 kfree(names[i]);
1409 kfree(names);
1410 }
1411 kfree(values);
1412 sel_remove_entries(dir);
1413
1414 return ret;
1415}
1416
1417static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1418 size_t count, loff_t *ppos)
1419{
1420 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1421 struct selinux_state *state = fsi->state;
1422 char tmpbuf[TMPBUFLEN];
1423 ssize_t length;
1424
1425 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1426 avc_get_cache_threshold(state->avc));
1427 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1428}
1429
1430static ssize_t sel_write_avc_cache_threshold(struct file *file,
1431 const char __user *buf,
1432 size_t count, loff_t *ppos)
1433
1434{
1435 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1436 struct selinux_state *state = fsi->state;
1437 char *page;
1438 ssize_t ret;
1439 unsigned int new_value;
1440
1441 ret = avc_has_perm(&selinux_state,
1442 current_sid(), SECINITSID_SECURITY,
1443 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1444 NULL);
1445 if (ret)
1446 return ret;
1447
1448 if (count >= PAGE_SIZE)
1449 return -ENOMEM;
1450
1451
1452 if (*ppos != 0)
1453 return -EINVAL;
1454
1455 page = memdup_user_nul(buf, count);
1456 if (IS_ERR(page))
1457 return PTR_ERR(page);
1458
1459 ret = -EINVAL;
1460 if (sscanf(page, "%u", &new_value) != 1)
1461 goto out;
1462
1463 avc_set_cache_threshold(state->avc, new_value);
1464
1465 ret = count;
1466out:
1467 kfree(page);
1468 return ret;
1469}
1470
1471static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1472 size_t count, loff_t *ppos)
1473{
1474 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1475 struct selinux_state *state = fsi->state;
1476 char *page;
1477 ssize_t length;
1478
1479 page = (char *)__get_free_page(GFP_KERNEL);
1480 if (!page)
1481 return -ENOMEM;
1482
1483 length = avc_get_hash_stats(state->avc, page);
1484 if (length >= 0)
1485 length = simple_read_from_buffer(buf, count, ppos, page, length);
1486 free_page((unsigned long)page);
1487
1488 return length;
1489}
1490
1491static const struct file_operations sel_avc_cache_threshold_ops = {
1492 .read = sel_read_avc_cache_threshold,
1493 .write = sel_write_avc_cache_threshold,
1494 .llseek = generic_file_llseek,
1495};
1496
1497static const struct file_operations sel_avc_hash_stats_ops = {
1498 .read = sel_read_avc_hash_stats,
1499 .llseek = generic_file_llseek,
1500};
1501
1502#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1503static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1504{
1505 int cpu;
1506
1507 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1508 if (!cpu_possible(cpu))
1509 continue;
1510 *idx = cpu + 1;
1511 return &per_cpu(avc_cache_stats, cpu);
1512 }
1513 return NULL;
1514}
1515
1516static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1517{
1518 loff_t n = *pos - 1;
1519
1520 if (*pos == 0)
1521 return SEQ_START_TOKEN;
1522
1523 return sel_avc_get_stat_idx(&n);
1524}
1525
1526static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1527{
1528 return sel_avc_get_stat_idx(pos);
1529}
1530
1531static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1532{
1533 struct avc_cache_stats *st = v;
1534
1535 if (v == SEQ_START_TOKEN) {
1536 seq_puts(seq,
1537 "lookups hits misses allocations reclaims frees\n");
1538 } else {
1539 unsigned int lookups = st->lookups;
1540 unsigned int misses = st->misses;
1541 unsigned int hits = lookups - misses;
1542 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1543 hits, misses, st->allocations,
1544 st->reclaims, st->frees);
1545 }
1546 return 0;
1547}
1548
1549static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1550{ }
1551
1552static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1553 .start = sel_avc_stats_seq_start,
1554 .next = sel_avc_stats_seq_next,
1555 .show = sel_avc_stats_seq_show,
1556 .stop = sel_avc_stats_seq_stop,
1557};
1558
1559static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1560{
1561 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1562}
1563
1564static const struct file_operations sel_avc_cache_stats_ops = {
1565 .open = sel_open_avc_cache_stats,
1566 .read = seq_read,
1567 .llseek = seq_lseek,
1568 .release = seq_release,
1569};
1570#endif
1571
1572static int sel_make_avc_files(struct dentry *dir)
1573{
1574 struct super_block *sb = dir->d_sb;
1575 struct selinux_fs_info *fsi = sb->s_fs_info;
1576 int i;
1577 static const struct tree_descr files[] = {
1578 { "cache_threshold",
1579 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1580 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1581#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1582 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1583#endif
1584 };
1585
1586 for (i = 0; i < ARRAY_SIZE(files); i++) {
1587 struct inode *inode;
1588 struct dentry *dentry;
1589
1590 dentry = d_alloc_name(dir, files[i].name);
1591 if (!dentry)
1592 return -ENOMEM;
1593
1594 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1595 if (!inode)
1596 return -ENOMEM;
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
1606static 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
1624static const struct file_operations sel_initcon_ops = {
1625 .read = sel_read_initcon,
1626 .llseek = generic_file_llseek,
1627};
1628
1629static 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 return -ENOMEM;
1643
1644 inode->i_fop = &sel_initcon_ops;
1645 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1646 d_add(dentry, inode);
1647 }
1648
1649 return 0;
1650}
1651
1652static inline unsigned long sel_class_to_ino(u16 class)
1653{
1654 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1655}
1656
1657static inline u16 sel_ino_to_class(unsigned long ino)
1658{
1659 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1660}
1661
1662static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1663{
1664 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1665}
1666
1667static inline u32 sel_ino_to_perm(unsigned long ino)
1668{
1669 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1670}
1671
1672static ssize_t sel_read_class(struct file *file, char __user *buf,
1673 size_t count, loff_t *ppos)
1674{
1675 unsigned long ino = file_inode(file)->i_ino;
1676 char res[TMPBUFLEN];
1677 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1678 return simple_read_from_buffer(buf, count, ppos, res, len);
1679}
1680
1681static const struct file_operations sel_class_ops = {
1682 .read = sel_read_class,
1683 .llseek = generic_file_llseek,
1684};
1685
1686static ssize_t sel_read_perm(struct file *file, char __user *buf,
1687 size_t count, loff_t *ppos)
1688{
1689 unsigned long ino = file_inode(file)->i_ino;
1690 char res[TMPBUFLEN];
1691 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1692 return simple_read_from_buffer(buf, count, ppos, res, len);
1693}
1694
1695static const struct file_operations sel_perm_ops = {
1696 .read = sel_read_perm,
1697 .llseek = generic_file_llseek,
1698};
1699
1700static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1701 size_t count, loff_t *ppos)
1702{
1703 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1704 int value;
1705 char tmpbuf[TMPBUFLEN];
1706 ssize_t length;
1707 unsigned long i_ino = file_inode(file)->i_ino;
1708
1709 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1710 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1711
1712 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1713}
1714
1715static const struct file_operations sel_policycap_ops = {
1716 .read = sel_read_policycap,
1717 .llseek = generic_file_llseek,
1718};
1719
1720static int sel_make_perm_files(char *objclass, int classvalue,
1721 struct dentry *dir)
1722{
1723 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1724 int i, rc, nperms;
1725 char **perms;
1726
1727 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1728 if (rc)
1729 return rc;
1730
1731 for (i = 0; i < nperms; i++) {
1732 struct inode *inode;
1733 struct dentry *dentry;
1734
1735 rc = -ENOMEM;
1736 dentry = d_alloc_name(dir, perms[i]);
1737 if (!dentry)
1738 goto out;
1739
1740 rc = -ENOMEM;
1741 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1742 if (!inode)
1743 goto out;
1744
1745 inode->i_fop = &sel_perm_ops;
1746
1747 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1748 d_add(dentry, inode);
1749 }
1750 rc = 0;
1751out:
1752 for (i = 0; i < nperms; i++)
1753 kfree(perms[i]);
1754 kfree(perms);
1755 return rc;
1756}
1757
1758static int sel_make_class_dir_entries(char *classname, int index,
1759 struct dentry *dir)
1760{
1761 struct super_block *sb = dir->d_sb;
1762 struct selinux_fs_info *fsi = sb->s_fs_info;
1763 struct dentry *dentry = NULL;
1764 struct inode *inode = NULL;
1765 int rc;
1766
1767 dentry = d_alloc_name(dir, "index");
1768 if (!dentry)
1769 return -ENOMEM;
1770
1771 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1772 if (!inode)
1773 return -ENOMEM;
1774
1775 inode->i_fop = &sel_class_ops;
1776 inode->i_ino = sel_class_to_ino(index);
1777 d_add(dentry, inode);
1778
1779 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1780 if (IS_ERR(dentry))
1781 return PTR_ERR(dentry);
1782
1783 rc = sel_make_perm_files(classname, index, dentry);
1784
1785 return rc;
1786}
1787
1788static int sel_make_classes(struct selinux_fs_info *fsi)
1789{
1790
1791 int rc, nclasses, i;
1792 char **classes;
1793
1794
1795 sel_remove_entries(fsi->class_dir);
1796
1797 rc = security_get_classes(fsi->state, &classes, &nclasses);
1798 if (rc)
1799 return rc;
1800
1801
1802 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1803
1804 for (i = 0; i < nclasses; i++) {
1805 struct dentry *class_name_dir;
1806
1807 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1808 &fsi->last_class_ino);
1809 if (IS_ERR(class_name_dir)) {
1810 rc = PTR_ERR(class_name_dir);
1811 goto out;
1812 }
1813
1814
1815 rc = sel_make_class_dir_entries(classes[i], i + 1,
1816 class_name_dir);
1817 if (rc)
1818 goto out;
1819 }
1820 rc = 0;
1821out:
1822 for (i = 0; i < nclasses; i++)
1823 kfree(classes[i]);
1824 kfree(classes);
1825 return rc;
1826}
1827
1828static int sel_make_policycap(struct selinux_fs_info *fsi)
1829{
1830 unsigned int iter;
1831 struct dentry *dentry = NULL;
1832 struct inode *inode = NULL;
1833
1834 sel_remove_entries(fsi->policycap_dir);
1835
1836 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1837 if (iter < ARRAY_SIZE(selinux_policycap_names))
1838 dentry = d_alloc_name(fsi->policycap_dir,
1839 selinux_policycap_names[iter]);
1840 else
1841 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1842
1843 if (dentry == NULL)
1844 return -ENOMEM;
1845
1846 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1847 if (inode == NULL)
1848 return -ENOMEM;
1849
1850 inode->i_fop = &sel_policycap_ops;
1851 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1852 d_add(dentry, inode);
1853 }
1854
1855 return 0;
1856}
1857
1858static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1859 unsigned long *ino)
1860{
1861 struct dentry *dentry = d_alloc_name(dir, name);
1862 struct inode *inode;
1863
1864 if (!dentry)
1865 return ERR_PTR(-ENOMEM);
1866
1867 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1868 if (!inode) {
1869 dput(dentry);
1870 return ERR_PTR(-ENOMEM);
1871 }
1872
1873 inode->i_op = &simple_dir_inode_operations;
1874 inode->i_fop = &simple_dir_operations;
1875 inode->i_ino = ++(*ino);
1876
1877 inc_nlink(inode);
1878 d_add(dentry, inode);
1879
1880 inc_nlink(d_inode(dir));
1881
1882 return dentry;
1883}
1884
1885#define NULL_FILE_NAME "null"
1886
1887static int sel_fill_super(struct super_block *sb, void *data, int silent)
1888{
1889 struct selinux_fs_info *fsi;
1890 int ret;
1891 struct dentry *dentry;
1892 struct inode *inode;
1893 struct inode_security_struct *isec;
1894
1895 static const struct tree_descr selinux_files[] = {
1896 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1897 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1898 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1899 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1900 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1901 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1902 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1903 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1904 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1905 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1906 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1907 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1908 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1909 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1910 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1911 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1912 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1913 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1914 S_IWUGO},
1915 {""}
1916 };
1917
1918 ret = selinux_fs_info_create(sb);
1919 if (ret)
1920 goto err;
1921
1922 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1923 if (ret)
1924 goto err;
1925
1926 fsi = sb->s_fs_info;
1927 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
1928 if (IS_ERR(fsi->bool_dir)) {
1929 ret = PTR_ERR(fsi->bool_dir);
1930 fsi->bool_dir = NULL;
1931 goto err;
1932 }
1933
1934 ret = -ENOMEM;
1935 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1936 if (!dentry)
1937 goto err;
1938
1939 ret = -ENOMEM;
1940 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1941 if (!inode)
1942 goto err;
1943
1944 inode->i_ino = ++fsi->last_ino;
1945 isec = (struct inode_security_struct *)inode->i_security;
1946 isec->sid = SECINITSID_DEVNULL;
1947 isec->sclass = SECCLASS_CHR_FILE;
1948 isec->initialized = LABEL_INITIALIZED;
1949
1950 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1951 d_add(dentry, inode);
1952
1953 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
1954 if (IS_ERR(dentry)) {
1955 ret = PTR_ERR(dentry);
1956 goto err;
1957 }
1958
1959 ret = sel_make_avc_files(dentry);
1960 if (ret)
1961 goto err;
1962
1963 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
1964 if (IS_ERR(dentry)) {
1965 ret = PTR_ERR(dentry);
1966 goto err;
1967 }
1968
1969 ret = sel_make_initcon_files(dentry);
1970 if (ret)
1971 goto err;
1972
1973 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
1974 if (IS_ERR(fsi->class_dir)) {
1975 ret = PTR_ERR(fsi->class_dir);
1976 fsi->class_dir = NULL;
1977 goto err;
1978 }
1979
1980 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
1981 &fsi->last_ino);
1982 if (IS_ERR(fsi->policycap_dir)) {
1983 ret = PTR_ERR(fsi->policycap_dir);
1984 fsi->policycap_dir = NULL;
1985 goto err;
1986 }
1987
1988 ret = sel_make_policy_nodes(fsi);
1989 if (ret)
1990 goto err;
1991 return 0;
1992err:
1993 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1994 __func__);
1995
1996 selinux_fs_info_free(sb);
1997
1998 return ret;
1999}
2000
2001static struct dentry *sel_mount(struct file_system_type *fs_type,
2002 int flags, const char *dev_name, void *data)
2003{
2004 return mount_single(fs_type, flags, data, sel_fill_super);
2005}
2006
2007static void sel_kill_sb(struct super_block *sb)
2008{
2009 selinux_fs_info_free(sb);
2010 kill_litter_super(sb);
2011}
2012
2013static struct file_system_type sel_fs_type = {
2014 .name = "selinuxfs",
2015 .mount = sel_mount,
2016 .kill_sb = sel_kill_sb,
2017};
2018
2019struct vfsmount *selinuxfs_mount;
2020struct path selinux_null;
2021
2022static int __init init_sel_fs(void)
2023{
2024 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2025 sizeof(NULL_FILE_NAME)-1);
2026 int err;
2027
2028 if (!selinux_enabled)
2029 return 0;
2030
2031 err = sysfs_create_mount_point(fs_kobj, "selinux");
2032 if (err)
2033 return err;
2034
2035 err = register_filesystem(&sel_fs_type);
2036 if (err) {
2037 sysfs_remove_mount_point(fs_kobj, "selinux");
2038 return err;
2039 }
2040
2041 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2042 if (IS_ERR(selinuxfs_mount)) {
2043 printk(KERN_ERR "selinuxfs: could not mount!\n");
2044 err = PTR_ERR(selinuxfs_mount);
2045 selinuxfs_mount = NULL;
2046 }
2047 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2048 &null_name);
2049 if (IS_ERR(selinux_null.dentry)) {
2050 pr_err("selinuxfs: could not lookup null!\n");
2051 err = PTR_ERR(selinux_null.dentry);
2052 selinux_null.dentry = NULL;
2053 }
2054
2055 return err;
2056}
2057
2058__initcall(init_sel_fs);
2059
2060#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2061void exit_sel_fs(void)
2062{
2063 sysfs_remove_mount_point(fs_kobj, "selinux");
2064 dput(selinux_null.dentry);
2065 kern_unmount(selinuxfs_mount);
2066 unregister_filesystem(&sel_fs_type);
2067}
2068#endif
2069
