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/namei.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/security.h>
27#include <linux/major.h>
28#include <linux/seq_file.h>
29#include <linux/percpu.h>
30#include <linux/audit.h>
31#include <linux/uaccess.h>
32#include <linux/kobject.h>
33#include <linux/ctype.h>
34
35/* selinuxfs pseudo filesystem for exporting the security policy API.
36   Based on the proc code and the fs/nfsd/nfsctl.c code. */
37
38#include "flask.h"
39#include "avc.h"
40#include "avc_ss.h"
41#include "security.h"
42#include "objsec.h"
43#include "conditional.h"
44#include "ima.h"
45
46enum sel_inos {
47	SEL_ROOT_INO = 2,
48	SEL_LOAD,	/* load policy */
49	SEL_ENFORCE,	/* get or set enforcing status */
50	SEL_CONTEXT,	/* validate context */
51	SEL_ACCESS,	/* compute access decision */
52	SEL_CREATE,	/* compute create labeling decision */
53	SEL_RELABEL,	/* compute relabeling decision */
54	SEL_USER,	/* compute reachable user contexts */
55	SEL_POLICYVERS,	/* return policy version for this kernel */
56	SEL_COMMIT_BOOLS, /* commit new boolean values */
57	SEL_MLS,	/* return if MLS policy is enabled */
58	SEL_DISABLE,	/* disable SELinux until next reboot */
59	SEL_MEMBER,	/* compute polyinstantiation membership decision */
60	SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
61	SEL_COMPAT_NET,	/* whether to use old compat network packet controls */
62	SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
63	SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
64	SEL_STATUS,	/* export current status using mmap() */
65	SEL_POLICY,	/* allow userspace to read the in kernel policy */
66	SEL_VALIDATE_TRANS, /* compute validatetrans decision */
67	SEL_INO_NEXT,	/* The next inode number to use */
68};
69
70struct selinux_fs_info {
71	struct dentry *bool_dir;
72	unsigned int bool_num;
73	char **bool_pending_names;
74	unsigned int *bool_pending_values;
75	struct dentry *class_dir;
76	unsigned long last_class_ino;
77	bool policy_opened;
78	struct dentry *policycap_dir;
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	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
99static 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 BOOL_DIR_NAME "booleans"
121#define CLASS_DIR_NAME "class"
122#define POLICYCAP_DIR_NAME "policy_capabilities"
123
124#define TMPBUFLEN	12
125static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
126				size_t count, loff_t *ppos)
127{
128	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
129	char tmpbuf[TMPBUFLEN];
130	ssize_t length;
131
132	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
133			   enforcing_enabled(fsi->state));
134	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
135}
136
137#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
138static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
139				 size_t count, loff_t *ppos)
140
141{
142	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
143	struct selinux_state *state = fsi->state;
144	char *page = NULL;
145	ssize_t length;
146	int old_value, new_value;
147
148	if (count >= PAGE_SIZE)
149		return -ENOMEM;
150
151	/* No partial writes. */
152	if (*ppos != 0)
153		return -EINVAL;
154
155	page = memdup_user_nul(buf, count);
156	if (IS_ERR(page))
157		return PTR_ERR(page);
158
159	length = -EINVAL;
160	if (sscanf(page, "%d", &new_value) != 1)
161		goto out;
162
163	new_value = !!new_value;
164
165	old_value = enforcing_enabled(state);
166	if (new_value != old_value) {
167		length = avc_has_perm(&selinux_state,
168				      current_sid(), SECINITSID_SECURITY,
169				      SECCLASS_SECURITY, SECURITY__SETENFORCE,
170				      NULL);
171		if (length)
172			goto out;
173		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
174			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
175			" enabled=1 old-enabled=1 lsm=selinux res=1",
176			new_value, old_value,
177			from_kuid(&init_user_ns, audit_get_loginuid(current)),
178			audit_get_sessionid(current));
179		enforcing_set(state, new_value);
180		if (new_value)
181			avc_ss_reset(state->avc, 0);
182		selnl_notify_setenforce(new_value);
183		selinux_status_update_setenforce(state, new_value);
184		if (!new_value)
185			call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
186
187		selinux_ima_measure_state(state);
188	}
189	length = count;
190out:
191	kfree(page);
192	return length;
193}
194#else
195#define sel_write_enforce NULL
196#endif
197
198static const struct file_operations sel_enforce_ops = {
199	.read		= sel_read_enforce,
200	.write		= sel_write_enforce,
201	.llseek		= generic_file_llseek,
202};
203
204static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
205					size_t count, loff_t *ppos)
206{
207	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
208	struct selinux_state *state = fsi->state;
209	char tmpbuf[TMPBUFLEN];
210	ssize_t length;
211	ino_t ino = file_inode(filp)->i_ino;
212	int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
213		security_get_reject_unknown(state) :
214		!security_get_allow_unknown(state);
215
216	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
217	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
218}
219
220static const struct file_operations sel_handle_unknown_ops = {
221	.read		= sel_read_handle_unknown,
222	.llseek		= generic_file_llseek,
223};
224
225static int sel_open_handle_status(struct inode *inode, struct file *filp)
226{
227	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
228	struct page    *status = selinux_kernel_status_page(fsi->state);
229
230	if (!status)
231		return -ENOMEM;
232
233	filp->private_data = status;
234
235	return 0;
236}
237
238static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
239				      size_t count, loff_t *ppos)
240{
241	struct page    *status = filp->private_data;
242
243	BUG_ON(!status);
244
245	return simple_read_from_buffer(buf, count, ppos,
246				       page_address(status),
247				       sizeof(struct selinux_kernel_status));
248}
249
250static int sel_mmap_handle_status(struct file *filp,
251				  struct vm_area_struct *vma)
252{
253	struct page    *status = filp->private_data;
254	unsigned long	size = vma->vm_end - vma->vm_start;
255
256	BUG_ON(!status);
257
258	/* only allows one page from the head */
259	if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
260		return -EIO;
261	/* disallow writable mapping */
262	if (vma->vm_flags & VM_WRITE)
263		return -EPERM;
264	/* disallow mprotect() turns it into writable */
265	vma->vm_flags &= ~VM_MAYWRITE;
266
267	return remap_pfn_range(vma, vma->vm_start,
268			       page_to_pfn(status),
269			       size, vma->vm_page_prot);
270}
271
272static const struct file_operations sel_handle_status_ops = {
273	.open		= sel_open_handle_status,
274	.read		= sel_read_handle_status,
275	.mmap		= sel_mmap_handle_status,
276	.llseek		= generic_file_llseek,
277};
278
279#ifdef CONFIG_SECURITY_SELINUX_DISABLE
280static ssize_t sel_write_disable(struct file *file, const char __user *buf,
281				 size_t count, loff_t *ppos)
282
283{
284	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
285	char *page;
286	ssize_t length;
287	int new_value;
288	int enforcing;
289
290	/* NOTE: we are now officially considering runtime disable as
291	 *       deprecated, and using it will become increasingly painful
292	 *       (e.g. sleeping/blocking) as we progress through future
293	 *       kernel releases until eventually it is removed
294	 */
295	pr_err("SELinux:  Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
296
297	if (count >= PAGE_SIZE)
298		return -ENOMEM;
299
300	/* No partial writes. */
301	if (*ppos != 0)
302		return -EINVAL;
303
304	page = memdup_user_nul(buf, count);
305	if (IS_ERR(page))
306		return PTR_ERR(page);
307
308	length = -EINVAL;
309	if (sscanf(page, "%d", &new_value) != 1)
310		goto out;
311
312	if (new_value) {
313		enforcing = enforcing_enabled(fsi->state);
314		length = selinux_disable(fsi->state);
315		if (length)
316			goto out;
317		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
318			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
319			" enabled=0 old-enabled=1 lsm=selinux res=1",
320			enforcing, enforcing,
321			from_kuid(&init_user_ns, audit_get_loginuid(current)),
322			audit_get_sessionid(current));
323	}
324
325	length = count;
326out:
327	kfree(page);
328	return length;
329}
330#else
331#define sel_write_disable NULL
332#endif
333
334static const struct file_operations sel_disable_ops = {
335	.write		= sel_write_disable,
336	.llseek		= generic_file_llseek,
337};
338
339static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
340				   size_t count, loff_t *ppos)
341{
342	char tmpbuf[TMPBUFLEN];
343	ssize_t length;
344
345	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
346	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
347}
348
349static const struct file_operations sel_policyvers_ops = {
350	.read		= sel_read_policyvers,
351	.llseek		= generic_file_llseek,
352};
353
354/* declaration for sel_write_load */
355static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
356			  unsigned int *bool_num, char ***bool_pending_names,
357			  unsigned int **bool_pending_values);
358static int sel_make_classes(struct selinux_policy *newpolicy,
359			    struct dentry *class_dir,
360			    unsigned long *last_class_ino);
361
362/* declaration for sel_make_class_dirs */
363static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
364			unsigned long *ino);
365
366/* declaration for sel_make_policy_nodes */
367static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
368						unsigned long *ino);
369
370/* declaration for sel_make_policy_nodes */
371static void sel_remove_entries(struct dentry *de);
372
373static ssize_t sel_read_mls(struct file *filp, char __user *buf,
374				size_t count, loff_t *ppos)
375{
376	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
377	char tmpbuf[TMPBUFLEN];
378	ssize_t length;
379
380	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
381			   security_mls_enabled(fsi->state));
382	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
383}
384
385static const struct file_operations sel_mls_ops = {
386	.read		= sel_read_mls,
387	.llseek		= generic_file_llseek,
388};
389
390struct policy_load_memory {
391	size_t len;
392	void *data;
393};
394
395static int sel_open_policy(struct inode *inode, struct file *filp)
396{
397	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
398	struct selinux_state *state = fsi->state;
399	struct policy_load_memory *plm = NULL;
400	int rc;
401
402	BUG_ON(filp->private_data);
403
404	mutex_lock(&fsi->state->policy_mutex);
405
406	rc = avc_has_perm(&selinux_state,
407			  current_sid(), SECINITSID_SECURITY,
408			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
409	if (rc)
410		goto err;
411
412	rc = -EBUSY;
413	if (fsi->policy_opened)
414		goto err;
415
416	rc = -ENOMEM;
417	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
418	if (!plm)
419		goto err;
420
421	rc = security_read_policy(state, &plm->data, &plm->len);
422	if (rc)
423		goto err;
424
425	if ((size_t)i_size_read(inode) != plm->len) {
426		inode_lock(inode);
427		i_size_write(inode, plm->len);
428		inode_unlock(inode);
429	}
430
431	fsi->policy_opened = 1;
432
433	filp->private_data = plm;
434
435	mutex_unlock(&fsi->state->policy_mutex);
436
437	return 0;
438err:
439	mutex_unlock(&fsi->state->policy_mutex);
440
441	if (plm)
442		vfree(plm->data);
443	kfree(plm);
444	return rc;
445}
446
447static int sel_release_policy(struct inode *inode, struct file *filp)
448{
449	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
450	struct policy_load_memory *plm = filp->private_data;
451
452	BUG_ON(!plm);
453
454	fsi->policy_opened = 0;
455
456	vfree(plm->data);
457	kfree(plm);
458
459	return 0;
460}
461
462static ssize_t sel_read_policy(struct file *filp, char __user *buf,
463			       size_t count, loff_t *ppos)
464{
465	struct policy_load_memory *plm = filp->private_data;
466	int ret;
467
468	ret = avc_has_perm(&selinux_state,
469			   current_sid(), SECINITSID_SECURITY,
470			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
471	if (ret)
472		return ret;
473
474	return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
475}
476
477static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
478{
479	struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
480	unsigned long offset;
481	struct page *page;
482
483	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
484		return VM_FAULT_SIGBUS;
485
486	offset = vmf->pgoff << PAGE_SHIFT;
487	if (offset >= roundup(plm->len, PAGE_SIZE))
488		return VM_FAULT_SIGBUS;
489
490	page = vmalloc_to_page(plm->data + offset);
491	get_page(page);
492
493	vmf->page = page;
494
495	return 0;
496}
497
498static const struct vm_operations_struct sel_mmap_policy_ops = {
499	.fault = sel_mmap_policy_fault,
500	.page_mkwrite = sel_mmap_policy_fault,
501};
502
503static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
504{
505	if (vma->vm_flags & VM_SHARED) {
506		/* do not allow mprotect to make mapping writable */
507		vma->vm_flags &= ~VM_MAYWRITE;
508
509		if (vma->vm_flags & VM_WRITE)
510			return -EACCES;
511	}
512
513	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
514	vma->vm_ops = &sel_mmap_policy_ops;
515
516	return 0;
517}
518
519static const struct file_operations sel_policy_ops = {
520	.open		= sel_open_policy,
521	.read		= sel_read_policy,
522	.mmap		= sel_mmap_policy,
523	.release	= sel_release_policy,
524	.llseek		= generic_file_llseek,
525};
526
527static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
528				unsigned int *bool_values)
529{
530	u32 i;
531
532	/* bool_dir cleanup */
533	for (i = 0; i < bool_num; i++)
534		kfree(bool_names[i]);
535	kfree(bool_names);
536	kfree(bool_values);
537}
538
539static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
540				struct selinux_policy *newpolicy)
541{
542	int ret = 0;
543	struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry;
544	unsigned int tmp_bool_num, old_bool_num;
545	char **tmp_bool_names, **old_bool_names;
546	unsigned int *tmp_bool_values, *old_bool_values;
547	unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
548
549	tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
550	if (IS_ERR(tmp_parent))
551		return PTR_ERR(tmp_parent);
552
553	tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
554	tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
555	if (IS_ERR(tmp_bool_dir)) {
556		ret = PTR_ERR(tmp_bool_dir);
557		goto out;
558	}
559
560	tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
561	tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
562	if (IS_ERR(tmp_class_dir)) {
563		ret = PTR_ERR(tmp_class_dir);
564		goto out;
565	}
566
567	ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
568			     &tmp_bool_names, &tmp_bool_values);
569	if (ret)
570		goto out;
571
572	ret = sel_make_classes(newpolicy, tmp_class_dir,
573			       &fsi->last_class_ino);
574	if (ret)
575		goto out;
576
577	/* booleans */
578	old_dentry = fsi->bool_dir;
579	lock_rename(tmp_bool_dir, old_dentry);
580	d_exchange(tmp_bool_dir, fsi->bool_dir);
581
582	old_bool_num = fsi->bool_num;
583	old_bool_names = fsi->bool_pending_names;
584	old_bool_values = fsi->bool_pending_values;
585
586	fsi->bool_num = tmp_bool_num;
587	fsi->bool_pending_names = tmp_bool_names;
588	fsi->bool_pending_values = tmp_bool_values;
589
590	sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
591
592	fsi->bool_dir = tmp_bool_dir;
593	unlock_rename(tmp_bool_dir, old_dentry);
594
595	/* classes */
596	old_dentry = fsi->class_dir;
597	lock_rename(tmp_class_dir, old_dentry);
598	d_exchange(tmp_class_dir, fsi->class_dir);
599	fsi->class_dir = tmp_class_dir;
600	unlock_rename(tmp_class_dir, old_dentry);
601
602out:
603	/* Since the other temporary dirs are children of tmp_parent
604	 * this will handle all the cleanup in the case of a failure before
605	 * the swapover
606	 */
607	sel_remove_entries(tmp_parent);
608	dput(tmp_parent); /* d_genocide() only handles the children */
609
610	return ret;
611}
612
613static ssize_t sel_write_load(struct file *file, const char __user *buf,
614			      size_t count, loff_t *ppos)
615
616{
617	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
618	struct selinux_load_state load_state;
619	ssize_t length;
620	void *data = NULL;
621
622	mutex_lock(&fsi->state->policy_mutex);
623
624	length = avc_has_perm(&selinux_state,
625			      current_sid(), SECINITSID_SECURITY,
626			      SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
627	if (length)
628		goto out;
629
630	/* No partial writes. */
631	length = -EINVAL;
632	if (*ppos != 0)
633		goto out;
634
635	length = -ENOMEM;
636	data = vmalloc(count);
637	if (!data)
638		goto out;
639
640	length = -EFAULT;
641	if (copy_from_user(data, buf, count) != 0)
642		goto out;
643
644	length = security_load_policy(fsi->state, data, count, &load_state);
645	if (length) {
646		pr_warn_ratelimited("SELinux: failed to load policy\n");
647		goto out;
648	}
649
650	length = sel_make_policy_nodes(fsi, load_state.policy);
651	if (length) {
652		pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
653		selinux_policy_cancel(fsi->state, &load_state);
654		goto out;
655	}
656
657	selinux_policy_commit(fsi->state, &load_state);
658
659	length = count;
660
661	audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
662		"auid=%u ses=%u lsm=selinux res=1",
663		from_kuid(&init_user_ns, audit_get_loginuid(current)),
664		audit_get_sessionid(current));
665out:
666	mutex_unlock(&fsi->state->policy_mutex);
667	vfree(data);
668	return length;
669}
670
671static const struct file_operations sel_load_ops = {
672	.write		= sel_write_load,
673	.llseek		= generic_file_llseek,
674};
675
676static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
677{
678	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
679	struct selinux_state *state = fsi->state;
680	char *canon = NULL;
681	u32 sid, len;
682	ssize_t length;
683
684	length = avc_has_perm(&selinux_state,
685			      current_sid(), SECINITSID_SECURITY,
686			      SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
687	if (length)
688		goto out;
689
690	length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
691	if (length)
692		goto out;
693
694	length = security_sid_to_context(state, sid, &canon, &len);
695	if (length)
696		goto out;
697
698	length = -ERANGE;
699	if (len > SIMPLE_TRANSACTION_LIMIT) {
700		pr_err("SELinux: %s:  context size (%u) exceeds "
701			"payload max\n", __func__, len);
702		goto out;
703	}
704
705	memcpy(buf, canon, len);
706	length = len;
707out:
708	kfree(canon);
709	return length;
710}
711
712static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
713				     size_t count, loff_t *ppos)
714{
715	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
716	char tmpbuf[TMPBUFLEN];
717	ssize_t length;
718
719	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
720			   checkreqprot_get(fsi->state));
721	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
722}
723
724static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
725				      size_t count, loff_t *ppos)
726{
727	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
728	char *page;
729	ssize_t length;
730	unsigned int new_value;
731
732	length = avc_has_perm(&selinux_state,
733			      current_sid(), SECINITSID_SECURITY,
734			      SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
735			      NULL);
736	if (length)
737		return length;
738
739	if (count >= PAGE_SIZE)
740		return -ENOMEM;
741
742	/* No partial writes. */
743	if (*ppos != 0)
744		return -EINVAL;
745
746	page = memdup_user_nul(buf, count);
747	if (IS_ERR(page))
748		return PTR_ERR(page);
749
750	length = -EINVAL;
751	if (sscanf(page, "%u", &new_value) != 1)
752		goto out;
753
754	if (new_value) {
755		char comm[sizeof(current->comm)];
756
757		memcpy(comm, current->comm, sizeof(comm));
758		pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
759			     comm, current->pid);
760	}
761
762	checkreqprot_set(fsi->state, (new_value ? 1 : 0));
763	length = count;
764
765	selinux_ima_measure_state(fsi->state);
766
767out:
768	kfree(page);
769	return length;
770}
771static const struct file_operations sel_checkreqprot_ops = {
772	.read		= sel_read_checkreqprot,
773	.write		= sel_write_checkreqprot,
774	.llseek		= generic_file_llseek,
775};
776
777static ssize_t sel_write_validatetrans(struct file *file,
778					const char __user *buf,
779					size_t count, loff_t *ppos)
780{
781	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
782	struct selinux_state *state = fsi->state;
783	char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
784	char *req = NULL;
785	u32 osid, nsid, tsid;
786	u16 tclass;
787	int rc;
788
789	rc = avc_has_perm(&selinux_state,
790			  current_sid(), SECINITSID_SECURITY,
791			  SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
792	if (rc)
793		goto out;
794
795	rc = -ENOMEM;
796	if (count >= PAGE_SIZE)
797		goto out;
798
799	/* No partial writes. */
800	rc = -EINVAL;
801	if (*ppos != 0)
802		goto out;
803
804	req = memdup_user_nul(buf, count);
805	if (IS_ERR(req)) {
806		rc = PTR_ERR(req);
807		req = NULL;
808		goto out;
809	}
810
811	rc = -ENOMEM;
812	oldcon = kzalloc(count + 1, GFP_KERNEL);
813	if (!oldcon)
814		goto out;
815
816	newcon = kzalloc(count + 1, GFP_KERNEL);
817	if (!newcon)
818		goto out;
819
820	taskcon = kzalloc(count + 1, GFP_KERNEL);
821	if (!taskcon)
822		goto out;
823
824	rc = -EINVAL;
825	if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
826		goto out;
827
828	rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
829	if (rc)
830		goto out;
831
832	rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
833	if (rc)
834		goto out;
835
836	rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
837	if (rc)
838		goto out;
839
840	rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
841	if (!rc)
842		rc = count;
843out:
844	kfree(req);
845	kfree(oldcon);
846	kfree(newcon);
847	kfree(taskcon);
848	return rc;
849}
850
851static const struct file_operations sel_transition_ops = {
852	.write		= sel_write_validatetrans,
853	.llseek		= generic_file_llseek,
854};
855
856/*
857 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
858 */
859static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
860static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
861static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
862static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
863static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
864
865static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
866	[SEL_ACCESS] = sel_write_access,
867	[SEL_CREATE] = sel_write_create,
868	[SEL_RELABEL] = sel_write_relabel,
869	[SEL_USER] = sel_write_user,
870	[SEL_MEMBER] = sel_write_member,
871	[SEL_CONTEXT] = sel_write_context,
872};
873
874static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
875{
876	ino_t ino = file_inode(file)->i_ino;
877	char *data;
878	ssize_t rv;
879
880	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
881		return -EINVAL;
882
883	data = simple_transaction_get(file, buf, size);
884	if (IS_ERR(data))
885		return PTR_ERR(data);
886
887	rv = write_op[ino](file, data, size);
888	if (rv > 0) {
889		simple_transaction_set(file, rv);
890		rv = size;
891	}
892	return rv;
893}
894
895static const struct file_operations transaction_ops = {
896	.write		= selinux_transaction_write,
897	.read		= simple_transaction_read,
898	.release	= simple_transaction_release,
899	.llseek		= generic_file_llseek,
900};
901
902/*
903 * payload - write methods
904 * If the method has a response, the response should be put in buf,
905 * and the length returned.  Otherwise return 0 or and -error.
906 */
907
908static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
909{
910	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
911	struct selinux_state *state = fsi->state;
912	char *scon = NULL, *tcon = NULL;
913	u32 ssid, tsid;
914	u16 tclass;
915	struct av_decision avd;
916	ssize_t length;
917
918	length = avc_has_perm(&selinux_state,
919			      current_sid(), SECINITSID_SECURITY,
920			      SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
921	if (length)
922		goto out;
923
924	length = -ENOMEM;
925	scon = kzalloc(size + 1, GFP_KERNEL);
926	if (!scon)
927		goto out;
928
929	length = -ENOMEM;
930	tcon = kzalloc(size + 1, GFP_KERNEL);
931	if (!tcon)
932		goto out;
933
934	length = -EINVAL;
935	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
936		goto out;
937
938	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
939	if (length)
940		goto out;
941
942	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
943	if (length)
944		goto out;
945
946	security_compute_av_user(state, ssid, tsid, tclass, &avd);
947
948	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
949			  "%x %x %x %x %u %x",
950			  avd.allowed, 0xffffffff,
951			  avd.auditallow, avd.auditdeny,
952			  avd.seqno, avd.flags);
953out:
954	kfree(tcon);
955	kfree(scon);
956	return length;
957}
958
959static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
960{
961	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
962	struct selinux_state *state = fsi->state;
963	char *scon = NULL, *tcon = NULL;
964	char *namebuf = NULL, *objname = NULL;
965	u32 ssid, tsid, newsid;
966	u16 tclass;
967	ssize_t length;
968	char *newcon = NULL;
969	u32 len;
970	int nargs;
971
972	length = avc_has_perm(&selinux_state,
973			      current_sid(), SECINITSID_SECURITY,
974			      SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
975			      NULL);
976	if (length)
977		goto out;
978
979	length = -ENOMEM;
980	scon = kzalloc(size + 1, GFP_KERNEL);
981	if (!scon)
982		goto out;
983
984	length = -ENOMEM;
985	tcon = kzalloc(size + 1, GFP_KERNEL);
986	if (!tcon)
987		goto out;
988
989	length = -ENOMEM;
990	namebuf = kzalloc(size + 1, GFP_KERNEL);
991	if (!namebuf)
992		goto out;
993
994	length = -EINVAL;
995	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
996	if (nargs < 3 || nargs > 4)
997		goto out;
998	if (nargs == 4) {
999		/*
1000		 * If and when the name of new object to be queried contains
1001		 * either whitespace or multibyte characters, they shall be
1002		 * encoded based on the percentage-encoding rule.
1003		 * If not encoded, the sscanf logic picks up only left-half
1004		 * of the supplied name; splitted by a whitespace unexpectedly.
1005		 */
1006		char   *r, *w;
1007		int     c1, c2;
1008
1009		r = w = namebuf;
1010		do {
1011			c1 = *r++;
1012			if (c1 == '+')
1013				c1 = ' ';
1014			else if (c1 == '%') {
1015				c1 = hex_to_bin(*r++);
1016				if (c1 < 0)
1017					goto out;
1018				c2 = hex_to_bin(*r++);
1019				if (c2 < 0)
1020					goto out;
1021				c1 = (c1 << 4) | c2;
1022			}
1023			*w++ = c1;
1024		} while (c1 != '\0');
1025
1026		objname = namebuf;
1027	}
1028
1029	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1030	if (length)
1031		goto out;
1032
1033	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1034	if (length)
1035		goto out;
1036
1037	length = security_transition_sid_user(state, ssid, tsid, tclass,
1038					      objname, &newsid);
1039	if (length)
1040		goto out;
1041
1042	length = security_sid_to_context(state, newsid, &newcon, &len);
1043	if (length)
1044		goto out;
1045
1046	length = -ERANGE;
1047	if (len > SIMPLE_TRANSACTION_LIMIT) {
1048		pr_err("SELinux: %s:  context size (%u) exceeds "
1049			"payload max\n", __func__, len);
1050		goto out;
1051	}
1052
1053	memcpy(buf, newcon, len);
1054	length = len;
1055out:
1056	kfree(newcon);
1057	kfree(namebuf);
1058	kfree(tcon);
1059	kfree(scon);
1060	return length;
1061}
1062
1063static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1064{
1065	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1066	struct selinux_state *state = fsi->state;
1067	char *scon = NULL, *tcon = NULL;
1068	u32 ssid, tsid, newsid;
1069	u16 tclass;
1070	ssize_t length;
1071	char *newcon = NULL;
1072	u32 len;
1073
1074	length = avc_has_perm(&selinux_state,
1075			      current_sid(), SECINITSID_SECURITY,
1076			      SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1077			      NULL);
1078	if (length)
1079		goto out;
1080
1081	length = -ENOMEM;
1082	scon = kzalloc(size + 1, GFP_KERNEL);
1083	if (!scon)
1084		goto out;
1085
1086	length = -ENOMEM;
1087	tcon = kzalloc(size + 1, GFP_KERNEL);
1088	if (!tcon)
1089		goto out;
1090
1091	length = -EINVAL;
1092	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1093		goto out;
1094
1095	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1096	if (length)
1097		goto out;
1098
1099	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1100	if (length)
1101		goto out;
1102
1103	length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1104	if (length)
1105		goto out;
1106
1107	length = security_sid_to_context(state, newsid, &newcon, &len);
1108	if (length)
1109		goto out;
1110
1111	length = -ERANGE;
1112	if (len > SIMPLE_TRANSACTION_LIMIT)
1113		goto out;
1114
1115	memcpy(buf, newcon, len);
1116	length = len;
1117out:
1118	kfree(newcon);
1119	kfree(tcon);
1120	kfree(scon);
1121	return length;
1122}
1123
1124static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1125{
1126	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1127	struct selinux_state *state = fsi->state;
1128	char *con = NULL, *user = NULL, *ptr;
1129	u32 sid, *sids = NULL;
1130	ssize_t length;
1131	char *newcon;
1132	int i, rc;
1133	u32 len, nsids;
1134
1135	length = avc_has_perm(&selinux_state,
1136			      current_sid(), SECINITSID_SECURITY,
1137			      SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1138			      NULL);
1139	if (length)
1140		goto out;
1141
1142	length = -ENOMEM;
1143	con = kzalloc(size + 1, GFP_KERNEL);
1144	if (!con)
1145		goto out;
1146
1147	length = -ENOMEM;
1148	user = kzalloc(size + 1, GFP_KERNEL);
1149	if (!user)
1150		goto out;
1151
1152	length = -EINVAL;
1153	if (sscanf(buf, "%s %s", con, user) != 2)
1154		goto out;
1155
1156	length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1157	if (length)
1158		goto out;
1159
1160	length = security_get_user_sids(state, sid, user, &sids, &nsids);
1161	if (length)
1162		goto out;
1163
1164	length = sprintf(buf, "%u", nsids) + 1;
1165	ptr = buf + length;
1166	for (i = 0; i < nsids; i++) {
1167		rc = security_sid_to_context(state, sids[i], &newcon, &len);
1168		if (rc) {
1169			length = rc;
1170			goto out;
1171		}
1172		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1173			kfree(newcon);
1174			length = -ERANGE;
1175			goto out;
1176		}
1177		memcpy(ptr, newcon, len);
1178		kfree(newcon);
1179		ptr += len;
1180		length += len;
1181	}
1182out:
1183	kfree(sids);
1184	kfree(user);
1185	kfree(con);
1186	return length;
1187}
1188
1189static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1190{
1191	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1192	struct selinux_state *state = fsi->state;
1193	char *scon = NULL, *tcon = NULL;
1194	u32 ssid, tsid, newsid;
1195	u16 tclass;
1196	ssize_t length;
1197	char *newcon = NULL;
1198	u32 len;
1199
1200	length = avc_has_perm(&selinux_state,
1201			      current_sid(), SECINITSID_SECURITY,
1202			      SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1203			      NULL);
1204	if (length)
1205		goto out;
1206
1207	length = -ENOMEM;
1208	scon = kzalloc(size + 1, GFP_KERNEL);
1209	if (!scon)
1210		goto out;
1211
1212	length = -ENOMEM;
1213	tcon = kzalloc(size + 1, GFP_KERNEL);
1214	if (!tcon)
1215		goto out;
1216
1217	length = -EINVAL;
1218	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1219		goto out;
1220
1221	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1222	if (length)
1223		goto out;
1224
1225	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1226	if (length)
1227		goto out;
1228
1229	length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1230	if (length)
1231		goto out;
1232
1233	length = security_sid_to_context(state, newsid, &newcon, &len);
1234	if (length)
1235		goto out;
1236
1237	length = -ERANGE;
1238	if (len > SIMPLE_TRANSACTION_LIMIT) {
1239		pr_err("SELinux: %s:  context size (%u) exceeds "
1240			"payload max\n", __func__, len);
1241		goto out;
1242	}
1243
1244	memcpy(buf, newcon, len);
1245	length = len;
1246out:
1247	kfree(newcon);
1248	kfree(tcon);
1249	kfree(scon);
1250	return length;
1251}
1252
1253static struct inode *sel_make_inode(struct super_block *sb, int mode)
1254{
1255	struct inode *ret = new_inode(sb);
1256
1257	if (ret) {
1258		ret->i_mode = mode;
1259		ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1260	}
1261	return ret;
1262}
1263
1264static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1265			     size_t count, loff_t *ppos)
1266{
1267	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1268	char *page = NULL;
1269	ssize_t length;
1270	ssize_t ret;
1271	int cur_enforcing;
1272	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1273	const char *name = filep->f_path.dentry->d_name.name;
1274
1275	mutex_lock(&fsi->state->policy_mutex);
1276
1277	ret = -EINVAL;
1278	if (index >= fsi->bool_num || strcmp(name,
1279					     fsi->bool_pending_names[index]))
1280		goto out_unlock;
1281
1282	ret = -ENOMEM;
1283	page = (char *)get_zeroed_page(GFP_KERNEL);
1284	if (!page)
1285		goto out_unlock;
1286
1287	cur_enforcing = security_get_bool_value(fsi->state, index);
1288	if (cur_enforcing < 0) {
1289		ret = cur_enforcing;
1290		goto out_unlock;
1291	}
1292	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1293			  fsi->bool_pending_values[index]);
1294	mutex_unlock(&fsi->state->policy_mutex);
1295	ret = simple_read_from_buffer(buf, count, ppos, page, length);
1296out_free:
1297	free_page((unsigned long)page);
1298	return ret;
1299
1300out_unlock:
1301	mutex_unlock(&fsi->state->policy_mutex);
1302	goto out_free;
1303}
1304
1305static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1306			      size_t count, loff_t *ppos)
1307{
1308	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1309	char *page = NULL;
1310	ssize_t length;
1311	int new_value;
1312	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1313	const char *name = filep->f_path.dentry->d_name.name;
1314
1315	if (count >= PAGE_SIZE)
1316		return -ENOMEM;
1317
1318	/* No partial writes. */
1319	if (*ppos != 0)
1320		return -EINVAL;
1321
1322	page = memdup_user_nul(buf, count);
1323	if (IS_ERR(page))
1324		return PTR_ERR(page);
1325
1326	mutex_lock(&fsi->state->policy_mutex);
1327
1328	length = avc_has_perm(&selinux_state,
1329			      current_sid(), SECINITSID_SECURITY,
1330			      SECCLASS_SECURITY, SECURITY__SETBOOL,
1331			      NULL);
1332	if (length)
1333		goto out;
1334
1335	length = -EINVAL;
1336	if (index >= fsi->bool_num || strcmp(name,
1337					     fsi->bool_pending_names[index]))
1338		goto out;
1339
1340	length = -EINVAL;
1341	if (sscanf(page, "%d", &new_value) != 1)
1342		goto out;
1343
1344	if (new_value)
1345		new_value = 1;
1346
1347	fsi->bool_pending_values[index] = new_value;
1348	length = count;
1349
1350out:
1351	mutex_unlock(&fsi->state->policy_mutex);
1352	kfree(page);
1353	return length;
1354}
1355
1356static const struct file_operations sel_bool_ops = {
1357	.read		= sel_read_bool,
1358	.write		= sel_write_bool,
1359	.llseek		= generic_file_llseek,
1360};
1361
1362static ssize_t sel_commit_bools_write(struct file *filep,
1363				      const char __user *buf,
1364				      size_t count, loff_t *ppos)
1365{
1366	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1367	char *page = NULL;
1368	ssize_t length;
1369	int new_value;
1370
1371	if (count >= PAGE_SIZE)
1372		return -ENOMEM;
1373
1374	/* No partial writes. */
1375	if (*ppos != 0)
1376		return -EINVAL;
1377
1378	page = memdup_user_nul(buf, count);
1379	if (IS_ERR(page))
1380		return PTR_ERR(page);
1381
1382	mutex_lock(&fsi->state->policy_mutex);
1383
1384	length = avc_has_perm(&selinux_state,
1385			      current_sid(), SECINITSID_SECURITY,
1386			      SECCLASS_SECURITY, SECURITY__SETBOOL,
1387			      NULL);
1388	if (length)
1389		goto out;
1390
1391	length = -EINVAL;
1392	if (sscanf(page, "%d", &new_value) != 1)
1393		goto out;
1394
1395	length = 0;
1396	if (new_value && fsi->bool_pending_values)
1397		length = security_set_bools(fsi->state, fsi->bool_num,
1398					    fsi->bool_pending_values);
1399
1400	if (!length)
1401		length = count;
1402
1403out:
1404	mutex_unlock(&fsi->state->policy_mutex);
1405	kfree(page);
1406	return length;
1407}
1408
1409static const struct file_operations sel_commit_bools_ops = {
1410	.write		= sel_commit_bools_write,
1411	.llseek		= generic_file_llseek,
1412};
1413
1414static void sel_remove_entries(struct dentry *de)
1415{
1416	d_genocide(de);
1417	shrink_dcache_parent(de);
1418}
1419
1420static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1421			  unsigned int *bool_num, char ***bool_pending_names,
1422			  unsigned int **bool_pending_values)
1423{
1424	int ret;
1425	ssize_t len;
1426	struct dentry *dentry = NULL;
1427	struct inode *inode = NULL;
1428	struct inode_security_struct *isec;
1429	char **names = NULL, *page;
1430	u32 i, num;
1431	int *values = NULL;
1432	u32 sid;
1433
1434	ret = -ENOMEM;
1435	page = (char *)get_zeroed_page(GFP_KERNEL);
1436	if (!page)
1437		goto out;
1438
1439	ret = security_get_bools(newpolicy, &num, &names, &values);
1440	if (ret)
1441		goto out;
1442
1443	for (i = 0; i < num; i++) {
1444		ret = -ENOMEM;
1445		dentry = d_alloc_name(bool_dir, names[i]);
1446		if (!dentry)
1447			goto out;
1448
1449		ret = -ENOMEM;
1450		inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1451		if (!inode) {
1452			dput(dentry);
1453			goto out;
1454		}
1455
1456		ret = -ENAMETOOLONG;
1457		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1458		if (len >= PAGE_SIZE) {
1459			dput(dentry);
1460			iput(inode);
1461			goto out;
1462		}
1463
1464		isec = selinux_inode(inode);
1465		ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1466					 SECCLASS_FILE, &sid);
1467		if (ret) {
1468			pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1469					   page);
1470			sid = SECINITSID_SECURITY;
1471		}
1472
1473		isec->sid = sid;
1474		isec->initialized = LABEL_INITIALIZED;
1475		inode->i_fop = &sel_bool_ops;
1476		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1477		d_add(dentry, inode);
1478	}
1479	*bool_num = num;
1480	*bool_pending_names = names;
1481	*bool_pending_values = values;
1482
1483	free_page((unsigned long)page);
1484	return 0;
1485out:
1486	free_page((unsigned long)page);
1487
1488	if (names) {
1489		for (i = 0; i < num; i++)
1490			kfree(names[i]);
1491		kfree(names);
1492	}
1493	kfree(values);
1494	sel_remove_entries(bool_dir);
1495
1496	return ret;
1497}
1498
1499static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1500					    size_t count, loff_t *ppos)
1501{
1502	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1503	struct selinux_state *state = fsi->state;
1504	char tmpbuf[TMPBUFLEN];
1505	ssize_t length;
1506
1507	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1508			   avc_get_cache_threshold(state->avc));
1509	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1510}
1511
1512static ssize_t sel_write_avc_cache_threshold(struct file *file,
1513					     const char __user *buf,
1514					     size_t count, loff_t *ppos)
1515
1516{
1517	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1518	struct selinux_state *state = fsi->state;
1519	char *page;
1520	ssize_t ret;
1521	unsigned int new_value;
1522
1523	ret = avc_has_perm(&selinux_state,
1524			   current_sid(), SECINITSID_SECURITY,
1525			   SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1526			   NULL);
1527	if (ret)
1528		return ret;
1529
1530	if (count >= PAGE_SIZE)
1531		return -ENOMEM;
1532
1533	/* No partial writes. */
1534	if (*ppos != 0)
1535		return -EINVAL;
1536
1537	page = memdup_user_nul(buf, count);
1538	if (IS_ERR(page))
1539		return PTR_ERR(page);
1540
1541	ret = -EINVAL;
1542	if (sscanf(page, "%u", &new_value) != 1)
1543		goto out;
1544
1545	avc_set_cache_threshold(state->avc, new_value);
1546
1547	ret = count;
1548out:
1549	kfree(page);
1550	return ret;
1551}
1552
1553static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1554				       size_t count, loff_t *ppos)
1555{
1556	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1557	struct selinux_state *state = fsi->state;
1558	char *page;
1559	ssize_t length;
1560
1561	page = (char *)__get_free_page(GFP_KERNEL);
1562	if (!page)
1563		return -ENOMEM;
1564
1565	length = avc_get_hash_stats(state->avc, page);
1566	if (length >= 0)
1567		length = simple_read_from_buffer(buf, count, ppos, page, length);
1568	free_page((unsigned long)page);
1569
1570	return length;
1571}
1572
1573static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1574					size_t count, loff_t *ppos)
1575{
1576	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1577	struct selinux_state *state = fsi->state;
1578	char *page;
1579	ssize_t length;
1580
1581	page = (char *)__get_free_page(GFP_KERNEL);
1582	if (!page)
1583		return -ENOMEM;
1584
1585	length = security_sidtab_hash_stats(state, page);
1586	if (length >= 0)
1587		length = simple_read_from_buffer(buf, count, ppos, page,
1588						length);
1589	free_page((unsigned long)page);
1590
1591	return length;
1592}
1593
1594static const struct file_operations sel_sidtab_hash_stats_ops = {
1595	.read		= sel_read_sidtab_hash_stats,
1596	.llseek		= generic_file_llseek,
1597};
1598
1599static const struct file_operations sel_avc_cache_threshold_ops = {
1600	.read		= sel_read_avc_cache_threshold,
1601	.write		= sel_write_avc_cache_threshold,
1602	.llseek		= generic_file_llseek,
1603};
1604
1605static const struct file_operations sel_avc_hash_stats_ops = {
1606	.read		= sel_read_avc_hash_stats,
1607	.llseek		= generic_file_llseek,
1608};
1609
1610#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1611static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1612{
1613	int cpu;
1614
1615	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1616		if (!cpu_possible(cpu))
1617			continue;
1618		*idx = cpu + 1;
1619		return &per_cpu(avc_cache_stats, cpu);
1620	}
1621	(*idx)++;
1622	return NULL;
1623}
1624
1625static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1626{
1627	loff_t n = *pos - 1;
1628
1629	if (*pos == 0)
1630		return SEQ_START_TOKEN;
1631
1632	return sel_avc_get_stat_idx(&n);
1633}
1634
1635static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1636{
1637	return sel_avc_get_stat_idx(pos);
1638}
1639
1640static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1641{
1642	struct avc_cache_stats *st = v;
1643
1644	if (v == SEQ_START_TOKEN) {
1645		seq_puts(seq,
1646			 "lookups hits misses allocations reclaims frees\n");
1647	} else {
1648		unsigned int lookups = st->lookups;
1649		unsigned int misses = st->misses;
1650		unsigned int hits = lookups - misses;
1651		seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1652			   hits, misses, st->allocations,
1653			   st->reclaims, st->frees);
1654	}
1655	return 0;
1656}
1657
1658static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1659{ }
1660
1661static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1662	.start		= sel_avc_stats_seq_start,
1663	.next		= sel_avc_stats_seq_next,
1664	.show		= sel_avc_stats_seq_show,
1665	.stop		= sel_avc_stats_seq_stop,
1666};
1667
1668static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1669{
1670	return seq_open(file, &sel_avc_cache_stats_seq_ops);
1671}
1672
1673static const struct file_operations sel_avc_cache_stats_ops = {
1674	.open		= sel_open_avc_cache_stats,
1675	.read		= seq_read,
1676	.llseek		= seq_lseek,
1677	.release	= seq_release,
1678};
1679#endif
1680
1681static int sel_make_avc_files(struct dentry *dir)
1682{
1683	struct super_block *sb = dir->d_sb;
1684	struct selinux_fs_info *fsi = sb->s_fs_info;
1685	int i;
1686	static const struct tree_descr files[] = {
1687		{ "cache_threshold",
1688		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1689		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1690#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1691		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1692#endif
1693	};
1694
1695	for (i = 0; i < ARRAY_SIZE(files); i++) {
1696		struct inode *inode;
1697		struct dentry *dentry;
1698
1699		dentry = d_alloc_name(dir, files[i].name);
1700		if (!dentry)
1701			return -ENOMEM;
1702
1703		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1704		if (!inode) {
1705			dput(dentry);
1706			return -ENOMEM;
1707		}
1708
1709		inode->i_fop = files[i].ops;
1710		inode->i_ino = ++fsi->last_ino;
1711		d_add(dentry, inode);
1712	}
1713
1714	return 0;
1715}
1716
1717static int sel_make_ss_files(struct dentry *dir)
1718{
1719	struct super_block *sb = dir->d_sb;
1720	struct selinux_fs_info *fsi = sb->s_fs_info;
1721	int i;
1722	static struct tree_descr files[] = {
1723		{ "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1724	};
1725
1726	for (i = 0; i < ARRAY_SIZE(files); i++) {
1727		struct inode *inode;
1728		struct dentry *dentry;
1729
1730		dentry = d_alloc_name(dir, files[i].name);
1731		if (!dentry)
1732			return -ENOMEM;
1733
1734		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1735		if (!inode) {
1736			dput(dentry);
1737			return -ENOMEM;
1738		}
1739
1740		inode->i_fop = files[i].ops;
1741		inode->i_ino = ++fsi->last_ino;
1742		d_add(dentry, inode);
1743	}
1744
1745	return 0;
1746}
1747
1748static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1749				size_t count, loff_t *ppos)
1750{
1751	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1752	char *con;
1753	u32 sid, len;
1754	ssize_t ret;
1755
1756	sid = file_inode(file)->i_ino&SEL_INO_MASK;
1757	ret = security_sid_to_context(fsi->state, sid, &con, &len);
1758	if (ret)
1759		return ret;
1760
1761	ret = simple_read_from_buffer(buf, count, ppos, con, len);
1762	kfree(con);
1763	return ret;
1764}
1765
1766static const struct file_operations sel_initcon_ops = {
1767	.read		= sel_read_initcon,
1768	.llseek		= generic_file_llseek,
1769};
1770
1771static int sel_make_initcon_files(struct dentry *dir)
1772{
1773	int i;
1774
1775	for (i = 1; i <= SECINITSID_NUM; i++) {
1776		struct inode *inode;
1777		struct dentry *dentry;
1778		const char *s = security_get_initial_sid_context(i);
1779
1780		if (!s)
1781			continue;
1782		dentry = d_alloc_name(dir, s);
1783		if (!dentry)
1784			return -ENOMEM;
1785
1786		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1787		if (!inode) {
1788			dput(dentry);
1789			return -ENOMEM;
1790		}
1791
1792		inode->i_fop = &sel_initcon_ops;
1793		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1794		d_add(dentry, inode);
1795	}
1796
1797	return 0;
1798}
1799
1800static inline unsigned long sel_class_to_ino(u16 class)
1801{
1802	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1803}
1804
1805static inline u16 sel_ino_to_class(unsigned long ino)
1806{
1807	return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1808}
1809
1810static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1811{
1812	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1813}
1814
1815static inline u32 sel_ino_to_perm(unsigned long ino)
1816{
1817	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1818}
1819
1820static ssize_t sel_read_class(struct file *file, char __user *buf,
1821				size_t count, loff_t *ppos)
1822{
1823	unsigned long ino = file_inode(file)->i_ino;
1824	char res[TMPBUFLEN];
1825	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1826	return simple_read_from_buffer(buf, count, ppos, res, len);
1827}
1828
1829static const struct file_operations sel_class_ops = {
1830	.read		= sel_read_class,
1831	.llseek		= generic_file_llseek,
1832};
1833
1834static ssize_t sel_read_perm(struct file *file, char __user *buf,
1835				size_t count, loff_t *ppos)
1836{
1837	unsigned long ino = file_inode(file)->i_ino;
1838	char res[TMPBUFLEN];
1839	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1840	return simple_read_from_buffer(buf, count, ppos, res, len);
1841}
1842
1843static const struct file_operations sel_perm_ops = {
1844	.read		= sel_read_perm,
1845	.llseek		= generic_file_llseek,
1846};
1847
1848static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1849				  size_t count, loff_t *ppos)
1850{
1851	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1852	int value;
1853	char tmpbuf[TMPBUFLEN];
1854	ssize_t length;
1855	unsigned long i_ino = file_inode(file)->i_ino;
1856
1857	value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1858	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1859
1860	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1861}
1862
1863static const struct file_operations sel_policycap_ops = {
1864	.read		= sel_read_policycap,
1865	.llseek		= generic_file_llseek,
1866};
1867
1868static int sel_make_perm_files(struct selinux_policy *newpolicy,
1869			char *objclass, int classvalue,
1870			struct dentry *dir)
1871{
1872	int i, rc, nperms;
1873	char **perms;
1874
1875	rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1876	if (rc)
1877		return rc;
1878
1879	for (i = 0; i < nperms; i++) {
1880		struct inode *inode;
1881		struct dentry *dentry;
1882
1883		rc = -ENOMEM;
1884		dentry = d_alloc_name(dir, perms[i]);
1885		if (!dentry)
1886			goto out;
1887
1888		rc = -ENOMEM;
1889		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1890		if (!inode) {
1891			dput(dentry);
1892			goto out;
1893		}
1894
1895		inode->i_fop = &sel_perm_ops;
1896		/* i+1 since perm values are 1-indexed */
1897		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1898		d_add(dentry, inode);
1899	}
1900	rc = 0;
1901out:
1902	for (i = 0; i < nperms; i++)
1903		kfree(perms[i]);
1904	kfree(perms);
1905	return rc;
1906}
1907
1908static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1909				char *classname, int index,
1910				struct dentry *dir)
1911{
1912	struct super_block *sb = dir->d_sb;
1913	struct selinux_fs_info *fsi = sb->s_fs_info;
1914	struct dentry *dentry = NULL;
1915	struct inode *inode = NULL;
1916	int rc;
1917
1918	dentry = d_alloc_name(dir, "index");
1919	if (!dentry)
1920		return -ENOMEM;
1921
1922	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1923	if (!inode) {
1924		dput(dentry);
1925		return -ENOMEM;
1926	}
1927
1928	inode->i_fop = &sel_class_ops;
1929	inode->i_ino = sel_class_to_ino(index);
1930	d_add(dentry, inode);
1931
1932	dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1933	if (IS_ERR(dentry))
1934		return PTR_ERR(dentry);
1935
1936	rc = sel_make_perm_files(newpolicy, classname, index, dentry);
1937
1938	return rc;
1939}
1940
1941static int sel_make_classes(struct selinux_policy *newpolicy,
1942			    struct dentry *class_dir,
1943			    unsigned long *last_class_ino)
1944{
1945
1946	int rc, nclasses, i;
1947	char **classes;
1948
1949	rc = security_get_classes(newpolicy, &classes, &nclasses);
1950	if (rc)
1951		return rc;
1952
1953	/* +2 since classes are 1-indexed */
1954	*last_class_ino = sel_class_to_ino(nclasses + 2);
1955
1956	for (i = 0; i < nclasses; i++) {
1957		struct dentry *class_name_dir;
1958
1959		class_name_dir = sel_make_dir(class_dir, classes[i],
1960					      last_class_ino);
1961		if (IS_ERR(class_name_dir)) {
1962			rc = PTR_ERR(class_name_dir);
1963			goto out;
1964		}
1965
1966		/* i+1 since class values are 1-indexed */
1967		rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1968				class_name_dir);
1969		if (rc)
1970			goto out;
1971	}
1972	rc = 0;
1973out:
1974	for (i = 0; i < nclasses; i++)
1975		kfree(classes[i]);
1976	kfree(classes);
1977	return rc;
1978}
1979
1980static int sel_make_policycap(struct selinux_fs_info *fsi)
1981{
1982	unsigned int iter;
1983	struct dentry *dentry = NULL;
1984	struct inode *inode = NULL;
1985
1986	for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1987		if (iter < ARRAY_SIZE(selinux_policycap_names))
1988			dentry = d_alloc_name(fsi->policycap_dir,
1989					      selinux_policycap_names[iter]);
1990		else
1991			dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1992
1993		if (dentry == NULL)
1994			return -ENOMEM;
1995
1996		inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1997		if (inode == NULL) {
1998			dput(dentry);
1999			return -ENOMEM;
2000		}
2001
2002		inode->i_fop = &sel_policycap_ops;
2003		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
2004		d_add(dentry, inode);
2005	}
2006
2007	return 0;
2008}
2009
2010static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2011			unsigned long *ino)
2012{
2013	struct dentry *dentry = d_alloc_name(dir, name);
2014	struct inode *inode;
2015
2016	if (!dentry)
2017		return ERR_PTR(-ENOMEM);
2018
2019	inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2020	if (!inode) {
2021		dput(dentry);
2022		return ERR_PTR(-ENOMEM);
2023	}
2024
2025	inode->i_op = &simple_dir_inode_operations;
2026	inode->i_fop = &simple_dir_operations;
2027	inode->i_ino = ++(*ino);
2028	/* directory inodes start off with i_nlink == 2 (for "." entry) */
2029	inc_nlink(inode);
2030	d_add(dentry, inode);
2031	/* bump link count on parent directory, too */
2032	inc_nlink(d_inode(dir));
2033
2034	return dentry;
2035}
2036
2037static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2038						unsigned long *ino)
2039{
2040	struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2041
2042	if (!inode)
2043		return ERR_PTR(-ENOMEM);
2044
2045	inode->i_op = &simple_dir_inode_operations;
2046	inode->i_fop = &simple_dir_operations;
2047	inode->i_ino = ++(*ino);
2048	/* directory inodes start off with i_nlink == 2 (for "." entry) */
2049	inc_nlink(inode);
2050	return d_obtain_alias(inode);
2051}
2052
2053#define NULL_FILE_NAME "null"
2054
2055static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2056{
2057	struct selinux_fs_info *fsi;
2058	int ret;
2059	struct dentry *dentry;
2060	struct inode *inode;
2061	struct inode_security_struct *isec;
2062
2063	static const struct tree_descr selinux_files[] = {
2064		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2065		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2066		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2067		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2068		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2069		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2070		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2071		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2072		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2073		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2074		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2075		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2076		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2077		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2078		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2079		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2080		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2081		[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2082					S_IWUGO},
2083		/* last one */ {""}
2084	};
2085
2086	ret = selinux_fs_info_create(sb);
2087	if (ret)
2088		goto err;
2089
2090	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2091	if (ret)
2092		goto err;
2093
2094	fsi = sb->s_fs_info;
2095	fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2096	if (IS_ERR(fsi->bool_dir)) {
2097		ret = PTR_ERR(fsi->bool_dir);
2098		fsi->bool_dir = NULL;
2099		goto err;
2100	}
2101
2102	ret = -ENOMEM;
2103	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2104	if (!dentry)
2105		goto err;
2106
2107	ret = -ENOMEM;
2108	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2109	if (!inode) {
2110		dput(dentry);
2111		goto err;
2112	}
2113
2114	inode->i_ino = ++fsi->last_ino;
2115	isec = selinux_inode(inode);
2116	isec->sid = SECINITSID_DEVNULL;
2117	isec->sclass = SECCLASS_CHR_FILE;
2118	isec->initialized = LABEL_INITIALIZED;
2119
2120	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2121	d_add(dentry, inode);
2122
2123	dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2124	if (IS_ERR(dentry)) {
2125		ret = PTR_ERR(dentry);
2126		goto err;
2127	}
2128
2129	ret = sel_make_avc_files(dentry);
2130
2131	dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2132	if (IS_ERR(dentry)) {
2133		ret = PTR_ERR(dentry);
2134		goto err;
2135	}
2136
2137	ret = sel_make_ss_files(dentry);
2138	if (ret)
2139		goto err;
2140
2141	dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2142	if (IS_ERR(dentry)) {
2143		ret = PTR_ERR(dentry);
2144		goto err;
2145	}
2146
2147	ret = sel_make_initcon_files(dentry);
2148	if (ret)
2149		goto err;
2150
2151	fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2152	if (IS_ERR(fsi->class_dir)) {
2153		ret = PTR_ERR(fsi->class_dir);
2154		fsi->class_dir = NULL;
2155		goto err;
2156	}
2157
2158	fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2159					  &fsi->last_ino);
2160	if (IS_ERR(fsi->policycap_dir)) {
2161		ret = PTR_ERR(fsi->policycap_dir);
2162		fsi->policycap_dir = NULL;
2163		goto err;
2164	}
2165
2166	ret = sel_make_policycap(fsi);
2167	if (ret) {
2168		pr_err("SELinux: failed to load policy capabilities\n");
2169		goto err;
2170	}
2171
2172	return 0;
2173err:
2174	pr_err("SELinux: %s:  failed while creating inodes\n",
2175		__func__);
2176
2177	selinux_fs_info_free(sb);
2178
2179	return ret;
2180}
2181
2182static int sel_get_tree(struct fs_context *fc)
2183{
2184	return get_tree_single(fc, sel_fill_super);
2185}
2186
2187static const struct fs_context_operations sel_context_ops = {
2188	.get_tree	= sel_get_tree,
2189};
2190
2191static int sel_init_fs_context(struct fs_context *fc)
2192{
2193	fc->ops = &sel_context_ops;
2194	return 0;
2195}
2196
2197static void sel_kill_sb(struct super_block *sb)
2198{
2199	selinux_fs_info_free(sb);
2200	kill_litter_super(sb);
2201}
2202
2203static struct file_system_type sel_fs_type = {
2204	.name		= "selinuxfs",
2205	.init_fs_context = sel_init_fs_context,
2206	.kill_sb	= sel_kill_sb,
2207};
2208
2209static struct vfsmount *selinuxfs_mount __ro_after_init;
2210struct path selinux_null __ro_after_init;
2211
2212static int __init init_sel_fs(void)
2213{
2214	struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2215					  sizeof(NULL_FILE_NAME)-1);
2216	int err;
2217
2218	if (!selinux_enabled_boot)
2219		return 0;
2220
2221	err = sysfs_create_mount_point(fs_kobj, "selinux");
2222	if (err)
2223		return err;
2224
2225	err = register_filesystem(&sel_fs_type);
2226	if (err) {
2227		sysfs_remove_mount_point(fs_kobj, "selinux");
2228		return err;
2229	}
2230
2231	selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2232	if (IS_ERR(selinuxfs_mount)) {
2233		pr_err("selinuxfs:  could not mount!\n");
2234		err = PTR_ERR(selinuxfs_mount);
2235		selinuxfs_mount = NULL;
2236	}
2237	selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2238						&null_name);
2239	if (IS_ERR(selinux_null.dentry)) {
2240		pr_err("selinuxfs:  could not lookup null!\n");
2241		err = PTR_ERR(selinux_null.dentry);
2242		selinux_null.dentry = NULL;
2243	}
2244
2245	return err;
2246}
2247
2248__initcall(init_sel_fs);
2249
2250#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2251void exit_sel_fs(void)
2252{
2253	sysfs_remove_mount_point(fs_kobj, "selinux");
2254	dput(selinux_null.dentry);
2255	kern_unmount(selinuxfs_mount);
2256	unregister_filesystem(&sel_fs_type);
2257}
2258#endif
2259