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	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	pr_err("SELinux:  https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n");
 297	ssleep(15);
 298
 299	if (count >= PAGE_SIZE)
 300		return -ENOMEM;
 301
 302	/* No partial writes. */
 303	if (*ppos != 0)
 304		return -EINVAL;
 305
 306	page = memdup_user_nul(buf, count);
 307	if (IS_ERR(page))
 308		return PTR_ERR(page);
 309
 310	length = -EINVAL;
 311	if (sscanf(page, "%d", &new_value) != 1)
 312		goto out;
 313
 314	if (new_value) {
 315		enforcing = enforcing_enabled(fsi->state);
 316		length = selinux_disable(fsi->state);
 317		if (length)
 318			goto out;
 319		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 320			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
 321			" enabled=0 old-enabled=1 lsm=selinux res=1",
 322			enforcing, enforcing,
 323			from_kuid(&init_user_ns, audit_get_loginuid(current)),
 324			audit_get_sessionid(current));
 325	}
 326
 327	length = count;
 328out:
 329	kfree(page);
 330	return length;
 331}
 332#else
 333#define sel_write_disable NULL
 334#endif
 335
 336static const struct file_operations sel_disable_ops = {
 337	.write		= sel_write_disable,
 338	.llseek		= generic_file_llseek,
 339};
 340
 341static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 342				   size_t count, loff_t *ppos)
 343{
 344	char tmpbuf[TMPBUFLEN];
 345	ssize_t length;
 346
 347	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 348	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 349}
 350
 351static const struct file_operations sel_policyvers_ops = {
 352	.read		= sel_read_policyvers,
 353	.llseek		= generic_file_llseek,
 354};
 355
 356/* declaration for sel_write_load */
 357static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
 358			  unsigned int *bool_num, char ***bool_pending_names,
 359			  int **bool_pending_values);
 360static int sel_make_classes(struct selinux_policy *newpolicy,
 361			    struct dentry *class_dir,
 362			    unsigned long *last_class_ino);
 363
 364/* declaration for sel_make_class_dirs */
 365static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 366			unsigned long *ino);
 367
 368/* declaration for sel_make_policy_nodes */
 369static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
 370						unsigned long *ino);
 371
 372/* declaration for sel_make_policy_nodes */
 373static void sel_remove_entries(struct dentry *de);
 374
 375static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 376				size_t count, loff_t *ppos)
 377{
 378	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 379	char tmpbuf[TMPBUFLEN];
 380	ssize_t length;
 381
 382	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 383			   security_mls_enabled(fsi->state));
 384	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 385}
 386
 387static const struct file_operations sel_mls_ops = {
 388	.read		= sel_read_mls,
 389	.llseek		= generic_file_llseek,
 390};
 391
 392struct policy_load_memory {
 393	size_t len;
 394	void *data;
 395};
 396
 397static int sel_open_policy(struct inode *inode, struct file *filp)
 398{
 399	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 400	struct selinux_state *state = fsi->state;
 401	struct policy_load_memory *plm = NULL;
 402	int rc;
 403
 404	BUG_ON(filp->private_data);
 405
 406	mutex_lock(&fsi->state->policy_mutex);
 407
 408	rc = avc_has_perm(&selinux_state,
 409			  current_sid(), SECINITSID_SECURITY,
 410			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 411	if (rc)
 412		goto err;
 413
 414	rc = -EBUSY;
 415	if (fsi->policy_opened)
 416		goto err;
 417
 418	rc = -ENOMEM;
 419	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 420	if (!plm)
 421		goto err;
 422
 423	rc = security_read_policy(state, &plm->data, &plm->len);
 424	if (rc)
 425		goto err;
 426
 427	if ((size_t)i_size_read(inode) != plm->len) {
 428		inode_lock(inode);
 429		i_size_write(inode, plm->len);
 430		inode_unlock(inode);
 431	}
 432
 
 
 
 
 433	fsi->policy_opened = 1;
 434
 435	filp->private_data = plm;
 436
 437	mutex_unlock(&fsi->state->policy_mutex);
 438
 439	return 0;
 440err:
 441	mutex_unlock(&fsi->state->policy_mutex);
 442
 443	if (plm)
 444		vfree(plm->data);
 445	kfree(plm);
 446	return rc;
 447}
 448
 449static int sel_release_policy(struct inode *inode, struct file *filp)
 450{
 451	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 452	struct policy_load_memory *plm = filp->private_data;
 453
 454	BUG_ON(!plm);
 455
 456	fsi->policy_opened = 0;
 457
 458	vfree(plm->data);
 459	kfree(plm);
 460
 461	return 0;
 462}
 463
 464static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 465			       size_t count, loff_t *ppos)
 466{
 467	struct policy_load_memory *plm = filp->private_data;
 468	int ret;
 469
 470	ret = avc_has_perm(&selinux_state,
 471			   current_sid(), SECINITSID_SECURITY,
 472			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 473	if (ret)
 474		return ret;
 475
 476	return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 477}
 478
 479static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
 480{
 481	struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
 482	unsigned long offset;
 483	struct page *page;
 484
 485	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 486		return VM_FAULT_SIGBUS;
 487
 488	offset = vmf->pgoff << PAGE_SHIFT;
 489	if (offset >= roundup(plm->len, PAGE_SIZE))
 490		return VM_FAULT_SIGBUS;
 491
 492	page = vmalloc_to_page(plm->data + offset);
 493	get_page(page);
 494
 495	vmf->page = page;
 496
 497	return 0;
 498}
 499
 500static const struct vm_operations_struct sel_mmap_policy_ops = {
 501	.fault = sel_mmap_policy_fault,
 502	.page_mkwrite = sel_mmap_policy_fault,
 503};
 504
 505static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 506{
 507	if (vma->vm_flags & VM_SHARED) {
 508		/* do not allow mprotect to make mapping writable */
 509		vma->vm_flags &= ~VM_MAYWRITE;
 510
 511		if (vma->vm_flags & VM_WRITE)
 512			return -EACCES;
 513	}
 514
 515	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 516	vma->vm_ops = &sel_mmap_policy_ops;
 517
 518	return 0;
 519}
 520
 521static const struct file_operations sel_policy_ops = {
 522	.open		= sel_open_policy,
 523	.read		= sel_read_policy,
 524	.mmap		= sel_mmap_policy,
 525	.release	= sel_release_policy,
 526	.llseek		= generic_file_llseek,
 527};
 528
 529static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
 530				     int *bool_values)
 531{
 532	u32 i;
 533
 534	/* bool_dir cleanup */
 535	for (i = 0; i < bool_num; i++)
 536		kfree(bool_names[i]);
 537	kfree(bool_names);
 538	kfree(bool_values);
 539}
 540
 541static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
 542				struct selinux_policy *newpolicy)
 543{
 544	int ret = 0;
 545	struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry;
 546	unsigned int tmp_bool_num, old_bool_num;
 547	char **tmp_bool_names, **old_bool_names;
 548	int *tmp_bool_values, *old_bool_values;
 549	unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
 550
 551	tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
 552	if (IS_ERR(tmp_parent))
 553		return PTR_ERR(tmp_parent);
 554
 555	tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
 556	tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
 557	if (IS_ERR(tmp_bool_dir)) {
 558		ret = PTR_ERR(tmp_bool_dir);
 559		goto out;
 560	}
 561
 562	tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
 563	tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
 564	if (IS_ERR(tmp_class_dir)) {
 565		ret = PTR_ERR(tmp_class_dir);
 566		goto out;
 567	}
 568
 569	ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
 570			     &tmp_bool_names, &tmp_bool_values);
 571	if (ret)
 572		goto out;
 573
 574	ret = sel_make_classes(newpolicy, tmp_class_dir,
 575			       &fsi->last_class_ino);
 576	if (ret)
 577		goto out;
 578
 579	/* booleans */
 580	old_dentry = fsi->bool_dir;
 581	lock_rename(tmp_bool_dir, old_dentry);
 582	d_exchange(tmp_bool_dir, fsi->bool_dir);
 583
 584	old_bool_num = fsi->bool_num;
 585	old_bool_names = fsi->bool_pending_names;
 586	old_bool_values = fsi->bool_pending_values;
 587
 588	fsi->bool_num = tmp_bool_num;
 589	fsi->bool_pending_names = tmp_bool_names;
 590	fsi->bool_pending_values = tmp_bool_values;
 591
 592	sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
 593
 594	fsi->bool_dir = tmp_bool_dir;
 595	unlock_rename(tmp_bool_dir, old_dentry);
 596
 597	/* classes */
 598	old_dentry = fsi->class_dir;
 599	lock_rename(tmp_class_dir, old_dentry);
 600	d_exchange(tmp_class_dir, fsi->class_dir);
 601	fsi->class_dir = tmp_class_dir;
 602	unlock_rename(tmp_class_dir, old_dentry);
 603
 604out:
 605	/* Since the other temporary dirs are children of tmp_parent
 606	 * this will handle all the cleanup in the case of a failure before
 607	 * the swapover
 608	 */
 609	sel_remove_entries(tmp_parent);
 610	dput(tmp_parent); /* d_genocide() only handles the children */
 611
 612	return ret;
 613}
 614
 615static ssize_t sel_write_load(struct file *file, const char __user *buf,
 616			      size_t count, loff_t *ppos)
 617
 618{
 619	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 620	struct selinux_load_state load_state;
 621	ssize_t length;
 622	void *data = NULL;
 623
 624	mutex_lock(&fsi->state->policy_mutex);
 625
 626	length = avc_has_perm(&selinux_state,
 627			      current_sid(), SECINITSID_SECURITY,
 628			      SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
 629	if (length)
 630		goto out;
 631
 632	/* No partial writes. */
 633	length = -EINVAL;
 634	if (*ppos != 0)
 635		goto out;
 636
 637	length = -ENOMEM;
 638	data = vmalloc(count);
 639	if (!data)
 640		goto out;
 641
 642	length = -EFAULT;
 643	if (copy_from_user(data, buf, count) != 0)
 644		goto out;
 645
 646	length = security_load_policy(fsi->state, data, count, &load_state);
 647	if (length) {
 648		pr_warn_ratelimited("SELinux: failed to load policy\n");
 649		goto out;
 650	}
 651
 652	length = sel_make_policy_nodes(fsi, load_state.policy);
 653	if (length) {
 654		pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
 655		selinux_policy_cancel(fsi->state, &load_state);
 656		goto out;
 657	}
 658
 659	selinux_policy_commit(fsi->state, &load_state);
 660
 661	length = count;
 662
 
 663	audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 664		"auid=%u ses=%u lsm=selinux res=1",
 665		from_kuid(&init_user_ns, audit_get_loginuid(current)),
 666		audit_get_sessionid(current));
 667out:
 668	mutex_unlock(&fsi->state->policy_mutex);
 669	vfree(data);
 670	return length;
 671}
 672
 673static const struct file_operations sel_load_ops = {
 674	.write		= sel_write_load,
 675	.llseek		= generic_file_llseek,
 676};
 677
 678static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 679{
 680	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 681	struct selinux_state *state = fsi->state;
 682	char *canon = NULL;
 683	u32 sid, len;
 684	ssize_t length;
 685
 686	length = avc_has_perm(&selinux_state,
 687			      current_sid(), SECINITSID_SECURITY,
 688			      SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
 689	if (length)
 690		goto out;
 691
 692	length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
 693	if (length)
 694		goto out;
 695
 696	length = security_sid_to_context(state, sid, &canon, &len);
 697	if (length)
 698		goto out;
 699
 700	length = -ERANGE;
 701	if (len > SIMPLE_TRANSACTION_LIMIT) {
 702		pr_err("SELinux: %s:  context size (%u) exceeds "
 703			"payload max\n", __func__, len);
 704		goto out;
 705	}
 706
 707	memcpy(buf, canon, len);
 708	length = len;
 709out:
 710	kfree(canon);
 711	return length;
 712}
 713
 714static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 715				     size_t count, loff_t *ppos)
 716{
 717	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 718	char tmpbuf[TMPBUFLEN];
 719	ssize_t length;
 720
 721	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
 722			   checkreqprot_get(fsi->state));
 723	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 724}
 725
 726static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 727				      size_t count, loff_t *ppos)
 728{
 729	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 730	char *page;
 731	ssize_t length;
 732	unsigned int new_value;
 733
 734	length = avc_has_perm(&selinux_state,
 735			      current_sid(), SECINITSID_SECURITY,
 736			      SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
 737			      NULL);
 738	if (length)
 739		return length;
 740
 741	if (count >= PAGE_SIZE)
 742		return -ENOMEM;
 743
 744	/* No partial writes. */
 745	if (*ppos != 0)
 746		return -EINVAL;
 747
 748	page = memdup_user_nul(buf, count);
 749	if (IS_ERR(page))
 750		return PTR_ERR(page);
 751
 752	length = -EINVAL;
 753	if (sscanf(page, "%u", &new_value) != 1)
 754		goto out;
 755
 756	if (new_value) {
 757		char comm[sizeof(current->comm)];
 758
 759		memcpy(comm, current->comm, sizeof(comm));
 760		pr_err("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
 761		       comm, current->pid);
 762	}
 763
 764	checkreqprot_set(fsi->state, (new_value ? 1 : 0));
 765	if (new_value)
 766		ssleep(15);
 767	length = count;
 768
 769	selinux_ima_measure_state(fsi->state);
 770
 771out:
 772	kfree(page);
 773	return length;
 774}
 775static const struct file_operations sel_checkreqprot_ops = {
 776	.read		= sel_read_checkreqprot,
 777	.write		= sel_write_checkreqprot,
 778	.llseek		= generic_file_llseek,
 779};
 780
 781static ssize_t sel_write_validatetrans(struct file *file,
 782					const char __user *buf,
 783					size_t count, loff_t *ppos)
 784{
 785	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 786	struct selinux_state *state = fsi->state;
 787	char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
 788	char *req = NULL;
 789	u32 osid, nsid, tsid;
 790	u16 tclass;
 791	int rc;
 792
 793	rc = avc_has_perm(&selinux_state,
 794			  current_sid(), SECINITSID_SECURITY,
 795			  SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
 796	if (rc)
 797		goto out;
 798
 799	rc = -ENOMEM;
 800	if (count >= PAGE_SIZE)
 801		goto out;
 802
 803	/* No partial writes. */
 804	rc = -EINVAL;
 805	if (*ppos != 0)
 806		goto out;
 807
 808	req = memdup_user_nul(buf, count);
 809	if (IS_ERR(req)) {
 810		rc = PTR_ERR(req);
 811		req = NULL;
 812		goto out;
 813	}
 814
 815	rc = -ENOMEM;
 816	oldcon = kzalloc(count + 1, GFP_KERNEL);
 817	if (!oldcon)
 818		goto out;
 819
 820	newcon = kzalloc(count + 1, GFP_KERNEL);
 821	if (!newcon)
 822		goto out;
 823
 824	taskcon = kzalloc(count + 1, GFP_KERNEL);
 825	if (!taskcon)
 826		goto out;
 827
 828	rc = -EINVAL;
 829	if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
 830		goto out;
 831
 832	rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
 833	if (rc)
 834		goto out;
 835
 836	rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
 837	if (rc)
 838		goto out;
 839
 840	rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
 841	if (rc)
 842		goto out;
 843
 844	rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
 845	if (!rc)
 846		rc = count;
 847out:
 848	kfree(req);
 849	kfree(oldcon);
 850	kfree(newcon);
 851	kfree(taskcon);
 852	return rc;
 853}
 854
 855static const struct file_operations sel_transition_ops = {
 856	.write		= sel_write_validatetrans,
 857	.llseek		= generic_file_llseek,
 858};
 859
 860/*
 861 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 862 */
 863static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 864static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 865static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 866static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 867static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 868
 869static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
 870	[SEL_ACCESS] = sel_write_access,
 871	[SEL_CREATE] = sel_write_create,
 872	[SEL_RELABEL] = sel_write_relabel,
 873	[SEL_USER] = sel_write_user,
 874	[SEL_MEMBER] = sel_write_member,
 875	[SEL_CONTEXT] = sel_write_context,
 876};
 877
 878static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 879{
 880	ino_t ino = file_inode(file)->i_ino;
 881	char *data;
 882	ssize_t rv;
 883
 884	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 885		return -EINVAL;
 886
 887	data = simple_transaction_get(file, buf, size);
 888	if (IS_ERR(data))
 889		return PTR_ERR(data);
 890
 891	rv = write_op[ino](file, data, size);
 892	if (rv > 0) {
 893		simple_transaction_set(file, rv);
 894		rv = size;
 895	}
 896	return rv;
 897}
 898
 899static const struct file_operations transaction_ops = {
 900	.write		= selinux_transaction_write,
 901	.read		= simple_transaction_read,
 902	.release	= simple_transaction_release,
 903	.llseek		= generic_file_llseek,
 904};
 905
 906/*
 907 * payload - write methods
 908 * If the method has a response, the response should be put in buf,
 909 * and the length returned.  Otherwise return 0 or and -error.
 910 */
 911
 912static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 913{
 914	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 915	struct selinux_state *state = fsi->state;
 916	char *scon = NULL, *tcon = NULL;
 917	u32 ssid, tsid;
 918	u16 tclass;
 919	struct av_decision avd;
 920	ssize_t length;
 921
 922	length = avc_has_perm(&selinux_state,
 923			      current_sid(), SECINITSID_SECURITY,
 924			      SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
 925	if (length)
 926		goto out;
 927
 928	length = -ENOMEM;
 929	scon = kzalloc(size + 1, GFP_KERNEL);
 930	if (!scon)
 931		goto out;
 932
 933	length = -ENOMEM;
 934	tcon = kzalloc(size + 1, GFP_KERNEL);
 935	if (!tcon)
 936		goto out;
 937
 938	length = -EINVAL;
 939	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 940		goto out;
 941
 942	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
 943	if (length)
 944		goto out;
 945
 946	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
 947	if (length)
 948		goto out;
 949
 950	security_compute_av_user(state, ssid, tsid, tclass, &avd);
 951
 952	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 953			  "%x %x %x %x %u %x",
 954			  avd.allowed, 0xffffffff,
 955			  avd.auditallow, avd.auditdeny,
 956			  avd.seqno, avd.flags);
 957out:
 958	kfree(tcon);
 959	kfree(scon);
 960	return length;
 961}
 962
 963static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 964{
 965	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 966	struct selinux_state *state = fsi->state;
 967	char *scon = NULL, *tcon = NULL;
 968	char *namebuf = NULL, *objname = NULL;
 969	u32 ssid, tsid, newsid;
 970	u16 tclass;
 971	ssize_t length;
 972	char *newcon = NULL;
 973	u32 len;
 974	int nargs;
 975
 976	length = avc_has_perm(&selinux_state,
 977			      current_sid(), SECINITSID_SECURITY,
 978			      SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
 979			      NULL);
 980	if (length)
 981		goto out;
 982
 983	length = -ENOMEM;
 984	scon = kzalloc(size + 1, GFP_KERNEL);
 985	if (!scon)
 986		goto out;
 987
 988	length = -ENOMEM;
 989	tcon = kzalloc(size + 1, GFP_KERNEL);
 990	if (!tcon)
 991		goto out;
 992
 993	length = -ENOMEM;
 994	namebuf = kzalloc(size + 1, GFP_KERNEL);
 995	if (!namebuf)
 996		goto out;
 997
 998	length = -EINVAL;
 999	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
1000	if (nargs < 3 || nargs > 4)
1001		goto out;
1002	if (nargs == 4) {
1003		/*
1004		 * If and when the name of new object to be queried contains
1005		 * either whitespace or multibyte characters, they shall be
1006		 * encoded based on the percentage-encoding rule.
1007		 * If not encoded, the sscanf logic picks up only left-half
1008		 * of the supplied name; splitted by a whitespace unexpectedly.
1009		 */
1010		char   *r, *w;
1011		int     c1, c2;
1012
1013		r = w = namebuf;
1014		do {
1015			c1 = *r++;
1016			if (c1 == '+')
1017				c1 = ' ';
1018			else if (c1 == '%') {
1019				c1 = hex_to_bin(*r++);
1020				if (c1 < 0)
1021					goto out;
1022				c2 = hex_to_bin(*r++);
1023				if (c2 < 0)
1024					goto out;
1025				c1 = (c1 << 4) | c2;
1026			}
1027			*w++ = c1;
1028		} while (c1 != '\0');
1029
1030		objname = namebuf;
1031	}
1032
1033	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1034	if (length)
1035		goto out;
1036
1037	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1038	if (length)
1039		goto out;
1040
1041	length = security_transition_sid_user(state, ssid, tsid, tclass,
1042					      objname, &newsid);
1043	if (length)
1044		goto out;
1045
1046	length = security_sid_to_context(state, newsid, &newcon, &len);
1047	if (length)
1048		goto out;
1049
1050	length = -ERANGE;
1051	if (len > SIMPLE_TRANSACTION_LIMIT) {
1052		pr_err("SELinux: %s:  context size (%u) exceeds "
1053			"payload max\n", __func__, len);
1054		goto out;
1055	}
1056
1057	memcpy(buf, newcon, len);
1058	length = len;
1059out:
1060	kfree(newcon);
1061	kfree(namebuf);
1062	kfree(tcon);
1063	kfree(scon);
1064	return length;
1065}
1066
1067static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1068{
1069	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1070	struct selinux_state *state = fsi->state;
1071	char *scon = NULL, *tcon = NULL;
1072	u32 ssid, tsid, newsid;
1073	u16 tclass;
1074	ssize_t length;
1075	char *newcon = NULL;
1076	u32 len;
1077
1078	length = avc_has_perm(&selinux_state,
1079			      current_sid(), SECINITSID_SECURITY,
1080			      SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1081			      NULL);
1082	if (length)
1083		goto out;
1084
1085	length = -ENOMEM;
1086	scon = kzalloc(size + 1, GFP_KERNEL);
1087	if (!scon)
1088		goto out;
1089
1090	length = -ENOMEM;
1091	tcon = kzalloc(size + 1, GFP_KERNEL);
1092	if (!tcon)
1093		goto out;
1094
1095	length = -EINVAL;
1096	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1097		goto out;
1098
1099	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1100	if (length)
1101		goto out;
1102
1103	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1104	if (length)
1105		goto out;
1106
1107	length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1108	if (length)
1109		goto out;
1110
1111	length = security_sid_to_context(state, newsid, &newcon, &len);
1112	if (length)
1113		goto out;
1114
1115	length = -ERANGE;
1116	if (len > SIMPLE_TRANSACTION_LIMIT)
1117		goto out;
1118
1119	memcpy(buf, newcon, len);
1120	length = len;
1121out:
1122	kfree(newcon);
1123	kfree(tcon);
1124	kfree(scon);
1125	return length;
1126}
1127
1128static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1129{
1130	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1131	struct selinux_state *state = fsi->state;
1132	char *con = NULL, *user = NULL, *ptr;
1133	u32 sid, *sids = NULL;
1134	ssize_t length;
1135	char *newcon;
1136	int i, rc;
1137	u32 len, nsids;
1138
1139	length = avc_has_perm(&selinux_state,
1140			      current_sid(), SECINITSID_SECURITY,
1141			      SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1142			      NULL);
1143	if (length)
1144		goto out;
1145
1146	length = -ENOMEM;
1147	con = kzalloc(size + 1, GFP_KERNEL);
1148	if (!con)
1149		goto out;
1150
1151	length = -ENOMEM;
1152	user = kzalloc(size + 1, GFP_KERNEL);
1153	if (!user)
1154		goto out;
1155
1156	length = -EINVAL;
1157	if (sscanf(buf, "%s %s", con, user) != 2)
1158		goto out;
1159
1160	length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1161	if (length)
1162		goto out;
1163
1164	length = security_get_user_sids(state, sid, user, &sids, &nsids);
1165	if (length)
1166		goto out;
1167
1168	length = sprintf(buf, "%u", nsids) + 1;
1169	ptr = buf + length;
1170	for (i = 0; i < nsids; i++) {
1171		rc = security_sid_to_context(state, sids[i], &newcon, &len);
1172		if (rc) {
1173			length = rc;
1174			goto out;
1175		}
1176		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1177			kfree(newcon);
1178			length = -ERANGE;
1179			goto out;
1180		}
1181		memcpy(ptr, newcon, len);
1182		kfree(newcon);
1183		ptr += len;
1184		length += len;
1185	}
1186out:
1187	kfree(sids);
1188	kfree(user);
1189	kfree(con);
1190	return length;
1191}
1192
1193static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1194{
1195	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1196	struct selinux_state *state = fsi->state;
1197	char *scon = NULL, *tcon = NULL;
1198	u32 ssid, tsid, newsid;
1199	u16 tclass;
1200	ssize_t length;
1201	char *newcon = NULL;
1202	u32 len;
1203
1204	length = avc_has_perm(&selinux_state,
1205			      current_sid(), SECINITSID_SECURITY,
1206			      SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1207			      NULL);
1208	if (length)
1209		goto out;
1210
1211	length = -ENOMEM;
1212	scon = kzalloc(size + 1, GFP_KERNEL);
1213	if (!scon)
1214		goto out;
1215
1216	length = -ENOMEM;
1217	tcon = kzalloc(size + 1, GFP_KERNEL);
1218	if (!tcon)
1219		goto out;
1220
1221	length = -EINVAL;
1222	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1223		goto out;
1224
1225	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1226	if (length)
1227		goto out;
1228
1229	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1230	if (length)
1231		goto out;
1232
1233	length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1234	if (length)
1235		goto out;
1236
1237	length = security_sid_to_context(state, newsid, &newcon, &len);
1238	if (length)
1239		goto out;
1240
1241	length = -ERANGE;
1242	if (len > SIMPLE_TRANSACTION_LIMIT) {
1243		pr_err("SELinux: %s:  context size (%u) exceeds "
1244			"payload max\n", __func__, len);
1245		goto out;
1246	}
1247
1248	memcpy(buf, newcon, len);
1249	length = len;
1250out:
1251	kfree(newcon);
1252	kfree(tcon);
1253	kfree(scon);
1254	return length;
1255}
1256
1257static struct inode *sel_make_inode(struct super_block *sb, int mode)
1258{
1259	struct inode *ret = new_inode(sb);
1260
1261	if (ret) {
1262		ret->i_mode = mode;
1263		ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1264	}
1265	return ret;
1266}
1267
1268static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1269			     size_t count, loff_t *ppos)
1270{
1271	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1272	char *page = NULL;
1273	ssize_t length;
1274	ssize_t ret;
1275	int cur_enforcing;
1276	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1277	const char *name = filep->f_path.dentry->d_name.name;
1278
1279	mutex_lock(&fsi->state->policy_mutex);
1280
1281	ret = -EINVAL;
1282	if (index >= fsi->bool_num || strcmp(name,
1283					     fsi->bool_pending_names[index]))
1284		goto out_unlock;
1285
1286	ret = -ENOMEM;
1287	page = (char *)get_zeroed_page(GFP_KERNEL);
1288	if (!page)
1289		goto out_unlock;
1290
1291	cur_enforcing = security_get_bool_value(fsi->state, index);
1292	if (cur_enforcing < 0) {
1293		ret = cur_enforcing;
1294		goto out_unlock;
1295	}
1296	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1297			  fsi->bool_pending_values[index]);
1298	mutex_unlock(&fsi->state->policy_mutex);
1299	ret = simple_read_from_buffer(buf, count, ppos, page, length);
1300out_free:
1301	free_page((unsigned long)page);
1302	return ret;
1303
1304out_unlock:
1305	mutex_unlock(&fsi->state->policy_mutex);
1306	goto out_free;
1307}
1308
1309static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1310			      size_t count, loff_t *ppos)
1311{
1312	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1313	char *page = NULL;
1314	ssize_t length;
1315	int new_value;
1316	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1317	const char *name = filep->f_path.dentry->d_name.name;
1318
1319	if (count >= PAGE_SIZE)
1320		return -ENOMEM;
1321
1322	/* No partial writes. */
1323	if (*ppos != 0)
1324		return -EINVAL;
1325
1326	page = memdup_user_nul(buf, count);
1327	if (IS_ERR(page))
1328		return PTR_ERR(page);
1329
1330	mutex_lock(&fsi->state->policy_mutex);
1331
1332	length = avc_has_perm(&selinux_state,
1333			      current_sid(), SECINITSID_SECURITY,
1334			      SECCLASS_SECURITY, SECURITY__SETBOOL,
1335			      NULL);
1336	if (length)
1337		goto out;
1338
1339	length = -EINVAL;
1340	if (index >= fsi->bool_num || strcmp(name,
1341					     fsi->bool_pending_names[index]))
1342		goto out;
1343
1344	length = -EINVAL;
1345	if (sscanf(page, "%d", &new_value) != 1)
1346		goto out;
1347
1348	if (new_value)
1349		new_value = 1;
1350
1351	fsi->bool_pending_values[index] = new_value;
1352	length = count;
1353
1354out:
1355	mutex_unlock(&fsi->state->policy_mutex);
1356	kfree(page);
1357	return length;
1358}
1359
1360static const struct file_operations sel_bool_ops = {
1361	.read		= sel_read_bool,
1362	.write		= sel_write_bool,
1363	.llseek		= generic_file_llseek,
1364};
1365
1366static ssize_t sel_commit_bools_write(struct file *filep,
1367				      const char __user *buf,
1368				      size_t count, loff_t *ppos)
1369{
1370	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1371	char *page = NULL;
1372	ssize_t length;
1373	int new_value;
1374
1375	if (count >= PAGE_SIZE)
1376		return -ENOMEM;
1377
1378	/* No partial writes. */
1379	if (*ppos != 0)
1380		return -EINVAL;
1381
1382	page = memdup_user_nul(buf, count);
1383	if (IS_ERR(page))
1384		return PTR_ERR(page);
1385
1386	mutex_lock(&fsi->state->policy_mutex);
1387
1388	length = avc_has_perm(&selinux_state,
1389			      current_sid(), SECINITSID_SECURITY,
1390			      SECCLASS_SECURITY, SECURITY__SETBOOL,
1391			      NULL);
1392	if (length)
1393		goto out;
1394
1395	length = -EINVAL;
1396	if (sscanf(page, "%d", &new_value) != 1)
1397		goto out;
1398
1399	length = 0;
1400	if (new_value && fsi->bool_pending_values)
1401		length = security_set_bools(fsi->state, fsi->bool_num,
1402					    fsi->bool_pending_values);
1403
1404	if (!length)
1405		length = count;
1406
1407out:
1408	mutex_unlock(&fsi->state->policy_mutex);
1409	kfree(page);
1410	return length;
1411}
1412
1413static const struct file_operations sel_commit_bools_ops = {
1414	.write		= sel_commit_bools_write,
1415	.llseek		= generic_file_llseek,
1416};
1417
1418static void sel_remove_entries(struct dentry *de)
1419{
1420	d_genocide(de);
1421	shrink_dcache_parent(de);
1422}
1423
1424static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1425			  unsigned int *bool_num, char ***bool_pending_names,
1426			  int **bool_pending_values)
1427{
1428	int ret;
1429	ssize_t len;
1430	struct dentry *dentry = NULL;
 
1431	struct inode *inode = NULL;
1432	struct inode_security_struct *isec;
1433	char **names = NULL, *page;
1434	u32 i, num;
1435	int *values = NULL;
1436	u32 sid;
1437
 
 
 
 
 
 
 
 
 
 
 
1438	ret = -ENOMEM;
1439	page = (char *)get_zeroed_page(GFP_KERNEL);
1440	if (!page)
1441		goto out;
1442
1443	ret = security_get_bools(newpolicy, &num, &names, &values);
1444	if (ret)
1445		goto out;
1446
1447	for (i = 0; i < num; i++) {
1448		ret = -ENOMEM;
1449		dentry = d_alloc_name(bool_dir, names[i]);
1450		if (!dentry)
1451			goto out;
1452
1453		ret = -ENOMEM;
1454		inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1455		if (!inode) {
1456			dput(dentry);
1457			goto out;
1458		}
1459
1460		ret = -ENAMETOOLONG;
1461		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1462		if (len >= PAGE_SIZE) {
1463			dput(dentry);
1464			iput(inode);
1465			goto out;
1466		}
1467
1468		isec = selinux_inode(inode);
1469		ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1470					 SECCLASS_FILE, &sid);
1471		if (ret) {
1472			pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1473					   page);
1474			sid = SECINITSID_SECURITY;
1475		}
1476
1477		isec->sid = sid;
1478		isec->initialized = LABEL_INITIALIZED;
1479		inode->i_fop = &sel_bool_ops;
1480		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1481		d_add(dentry, inode);
1482	}
1483	*bool_num = num;
1484	*bool_pending_names = names;
1485	*bool_pending_values = values;
1486
1487	free_page((unsigned long)page);
1488	return 0;
1489out:
1490	free_page((unsigned long)page);
1491
1492	if (names) {
1493		for (i = 0; i < num; i++)
1494			kfree(names[i]);
1495		kfree(names);
1496	}
1497	kfree(values);
1498	sel_remove_entries(bool_dir);
1499
1500	return ret;
1501}
1502
1503static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1504					    size_t count, loff_t *ppos)
1505{
1506	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1507	struct selinux_state *state = fsi->state;
1508	char tmpbuf[TMPBUFLEN];
1509	ssize_t length;
1510
1511	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1512			   avc_get_cache_threshold(state->avc));
1513	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1514}
1515
1516static ssize_t sel_write_avc_cache_threshold(struct file *file,
1517					     const char __user *buf,
1518					     size_t count, loff_t *ppos)
1519
1520{
1521	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1522	struct selinux_state *state = fsi->state;
1523	char *page;
1524	ssize_t ret;
1525	unsigned int new_value;
1526
1527	ret = avc_has_perm(&selinux_state,
1528			   current_sid(), SECINITSID_SECURITY,
1529			   SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1530			   NULL);
1531	if (ret)
1532		return ret;
1533
1534	if (count >= PAGE_SIZE)
1535		return -ENOMEM;
1536
1537	/* No partial writes. */
1538	if (*ppos != 0)
1539		return -EINVAL;
1540
1541	page = memdup_user_nul(buf, count);
1542	if (IS_ERR(page))
1543		return PTR_ERR(page);
1544
1545	ret = -EINVAL;
1546	if (sscanf(page, "%u", &new_value) != 1)
1547		goto out;
1548
1549	avc_set_cache_threshold(state->avc, new_value);
1550
1551	ret = count;
1552out:
1553	kfree(page);
1554	return ret;
1555}
1556
1557static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1558				       size_t count, loff_t *ppos)
1559{
1560	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1561	struct selinux_state *state = fsi->state;
1562	char *page;
1563	ssize_t length;
1564
1565	page = (char *)__get_free_page(GFP_KERNEL);
1566	if (!page)
1567		return -ENOMEM;
1568
1569	length = avc_get_hash_stats(state->avc, page);
1570	if (length >= 0)
1571		length = simple_read_from_buffer(buf, count, ppos, page, length);
1572	free_page((unsigned long)page);
1573
1574	return length;
1575}
1576
1577static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1578					size_t count, loff_t *ppos)
1579{
1580	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1581	struct selinux_state *state = fsi->state;
1582	char *page;
1583	ssize_t length;
1584
1585	page = (char *)__get_free_page(GFP_KERNEL);
1586	if (!page)
1587		return -ENOMEM;
1588
1589	length = security_sidtab_hash_stats(state, page);
1590	if (length >= 0)
1591		length = simple_read_from_buffer(buf, count, ppos, page,
1592						length);
1593	free_page((unsigned long)page);
1594
1595	return length;
1596}
1597
1598static const struct file_operations sel_sidtab_hash_stats_ops = {
1599	.read		= sel_read_sidtab_hash_stats,
1600	.llseek		= generic_file_llseek,
1601};
1602
1603static const struct file_operations sel_avc_cache_threshold_ops = {
1604	.read		= sel_read_avc_cache_threshold,
1605	.write		= sel_write_avc_cache_threshold,
1606	.llseek		= generic_file_llseek,
1607};
1608
1609static const struct file_operations sel_avc_hash_stats_ops = {
1610	.read		= sel_read_avc_hash_stats,
1611	.llseek		= generic_file_llseek,
1612};
1613
1614#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1615static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1616{
1617	int cpu;
1618
1619	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1620		if (!cpu_possible(cpu))
1621			continue;
1622		*idx = cpu + 1;
1623		return &per_cpu(avc_cache_stats, cpu);
1624	}
1625	(*idx)++;
1626	return NULL;
1627}
1628
1629static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1630{
1631	loff_t n = *pos - 1;
1632
1633	if (*pos == 0)
1634		return SEQ_START_TOKEN;
1635
1636	return sel_avc_get_stat_idx(&n);
1637}
1638
1639static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1640{
1641	return sel_avc_get_stat_idx(pos);
1642}
1643
1644static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1645{
1646	struct avc_cache_stats *st = v;
1647
1648	if (v == SEQ_START_TOKEN) {
1649		seq_puts(seq,
1650			 "lookups hits misses allocations reclaims frees\n");
1651	} else {
1652		unsigned int lookups = st->lookups;
1653		unsigned int misses = st->misses;
1654		unsigned int hits = lookups - misses;
1655		seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1656			   hits, misses, st->allocations,
1657			   st->reclaims, st->frees);
1658	}
1659	return 0;
1660}
1661
1662static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1663{ }
1664
1665static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1666	.start		= sel_avc_stats_seq_start,
1667	.next		= sel_avc_stats_seq_next,
1668	.show		= sel_avc_stats_seq_show,
1669	.stop		= sel_avc_stats_seq_stop,
1670};
1671
1672static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1673{
1674	return seq_open(file, &sel_avc_cache_stats_seq_ops);
1675}
1676
1677static const struct file_operations sel_avc_cache_stats_ops = {
1678	.open		= sel_open_avc_cache_stats,
1679	.read		= seq_read,
1680	.llseek		= seq_lseek,
1681	.release	= seq_release,
1682};
1683#endif
1684
1685static int sel_make_avc_files(struct dentry *dir)
1686{
1687	struct super_block *sb = dir->d_sb;
1688	struct selinux_fs_info *fsi = sb->s_fs_info;
1689	int i;
1690	static const struct tree_descr files[] = {
1691		{ "cache_threshold",
1692		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1693		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1694#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1695		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1696#endif
1697	};
1698
1699	for (i = 0; i < ARRAY_SIZE(files); i++) {
1700		struct inode *inode;
1701		struct dentry *dentry;
1702
1703		dentry = d_alloc_name(dir, files[i].name);
1704		if (!dentry)
1705			return -ENOMEM;
1706
1707		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1708		if (!inode) {
1709			dput(dentry);
1710			return -ENOMEM;
1711		}
1712
1713		inode->i_fop = files[i].ops;
1714		inode->i_ino = ++fsi->last_ino;
1715		d_add(dentry, inode);
1716	}
1717
1718	return 0;
1719}
1720
1721static int sel_make_ss_files(struct dentry *dir)
1722{
1723	struct super_block *sb = dir->d_sb;
1724	struct selinux_fs_info *fsi = sb->s_fs_info;
1725	int i;
1726	static struct tree_descr files[] = {
1727		{ "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1728	};
1729
1730	for (i = 0; i < ARRAY_SIZE(files); i++) {
1731		struct inode *inode;
1732		struct dentry *dentry;
1733
1734		dentry = d_alloc_name(dir, files[i].name);
1735		if (!dentry)
1736			return -ENOMEM;
1737
1738		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1739		if (!inode) {
1740			dput(dentry);
1741			return -ENOMEM;
1742		}
1743
1744		inode->i_fop = files[i].ops;
1745		inode->i_ino = ++fsi->last_ino;
1746		d_add(dentry, inode);
1747	}
1748
1749	return 0;
1750}
1751
1752static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1753				size_t count, loff_t *ppos)
1754{
1755	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1756	char *con;
1757	u32 sid, len;
1758	ssize_t ret;
1759
1760	sid = file_inode(file)->i_ino&SEL_INO_MASK;
1761	ret = security_sid_to_context(fsi->state, sid, &con, &len);
1762	if (ret)
1763		return ret;
1764
1765	ret = simple_read_from_buffer(buf, count, ppos, con, len);
1766	kfree(con);
1767	return ret;
1768}
1769
1770static const struct file_operations sel_initcon_ops = {
1771	.read		= sel_read_initcon,
1772	.llseek		= generic_file_llseek,
1773};
1774
1775static int sel_make_initcon_files(struct dentry *dir)
1776{
1777	int i;
1778
1779	for (i = 1; i <= SECINITSID_NUM; i++) {
1780		struct inode *inode;
1781		struct dentry *dentry;
1782		const char *s = security_get_initial_sid_context(i);
1783
1784		if (!s)
1785			continue;
1786		dentry = d_alloc_name(dir, s);
1787		if (!dentry)
1788			return -ENOMEM;
1789
1790		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1791		if (!inode) {
1792			dput(dentry);
1793			return -ENOMEM;
1794		}
1795
1796		inode->i_fop = &sel_initcon_ops;
1797		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1798		d_add(dentry, inode);
1799	}
1800
1801	return 0;
1802}
1803
1804static inline unsigned long sel_class_to_ino(u16 class)
1805{
1806	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1807}
1808
1809static inline u16 sel_ino_to_class(unsigned long ino)
1810{
1811	return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1812}
1813
1814static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1815{
1816	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1817}
1818
1819static inline u32 sel_ino_to_perm(unsigned long ino)
1820{
1821	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1822}
1823
1824static ssize_t sel_read_class(struct file *file, char __user *buf,
1825				size_t count, loff_t *ppos)
1826{
1827	unsigned long ino = file_inode(file)->i_ino;
1828	char res[TMPBUFLEN];
1829	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1830	return simple_read_from_buffer(buf, count, ppos, res, len);
1831}
1832
1833static const struct file_operations sel_class_ops = {
1834	.read		= sel_read_class,
1835	.llseek		= generic_file_llseek,
1836};
1837
1838static ssize_t sel_read_perm(struct file *file, char __user *buf,
1839				size_t count, loff_t *ppos)
1840{
1841	unsigned long ino = file_inode(file)->i_ino;
1842	char res[TMPBUFLEN];
1843	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1844	return simple_read_from_buffer(buf, count, ppos, res, len);
1845}
1846
1847static const struct file_operations sel_perm_ops = {
1848	.read		= sel_read_perm,
1849	.llseek		= generic_file_llseek,
1850};
1851
1852static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1853				  size_t count, loff_t *ppos)
1854{
1855	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1856	int value;
1857	char tmpbuf[TMPBUFLEN];
1858	ssize_t length;
1859	unsigned long i_ino = file_inode(file)->i_ino;
1860
1861	value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1862	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1863
1864	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1865}
1866
1867static const struct file_operations sel_policycap_ops = {
1868	.read		= sel_read_policycap,
1869	.llseek		= generic_file_llseek,
1870};
1871
1872static int sel_make_perm_files(struct selinux_policy *newpolicy,
1873			char *objclass, int classvalue,
1874			struct dentry *dir)
1875{
 
1876	int i, rc, nperms;
1877	char **perms;
1878
1879	rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1880	if (rc)
1881		return rc;
1882
1883	for (i = 0; i < nperms; i++) {
1884		struct inode *inode;
1885		struct dentry *dentry;
1886
1887		rc = -ENOMEM;
1888		dentry = d_alloc_name(dir, perms[i]);
1889		if (!dentry)
1890			goto out;
1891
1892		rc = -ENOMEM;
1893		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1894		if (!inode) {
1895			dput(dentry);
1896			goto out;
1897		}
1898
1899		inode->i_fop = &sel_perm_ops;
1900		/* i+1 since perm values are 1-indexed */
1901		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1902		d_add(dentry, inode);
1903	}
1904	rc = 0;
1905out:
1906	for (i = 0; i < nperms; i++)
1907		kfree(perms[i]);
1908	kfree(perms);
1909	return rc;
1910}
1911
1912static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1913				char *classname, int index,
1914				struct dentry *dir)
1915{
1916	struct super_block *sb = dir->d_sb;
1917	struct selinux_fs_info *fsi = sb->s_fs_info;
1918	struct dentry *dentry = NULL;
1919	struct inode *inode = NULL;
 
1920
1921	dentry = d_alloc_name(dir, "index");
1922	if (!dentry)
1923		return -ENOMEM;
1924
1925	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1926	if (!inode) {
1927		dput(dentry);
1928		return -ENOMEM;
1929	}
1930
1931	inode->i_fop = &sel_class_ops;
1932	inode->i_ino = sel_class_to_ino(index);
1933	d_add(dentry, inode);
1934
1935	dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1936	if (IS_ERR(dentry))
1937		return PTR_ERR(dentry);
1938
1939	return sel_make_perm_files(newpolicy, classname, index, dentry);
 
 
1940}
1941
1942static int sel_make_classes(struct selinux_policy *newpolicy,
1943			    struct dentry *class_dir,
1944			    unsigned long *last_class_ino)
1945{
1946
1947	int rc, nclasses, i;
1948	char **classes;
1949
1950	rc = security_get_classes(newpolicy, &classes, &nclasses);
 
 
 
1951	if (rc)
1952		return rc;
1953
1954	/* +2 since classes are 1-indexed */
1955	*last_class_ino = sel_class_to_ino(nclasses + 2);
1956
1957	for (i = 0; i < nclasses; i++) {
1958		struct dentry *class_name_dir;
1959
1960		class_name_dir = sel_make_dir(class_dir, classes[i],
1961					      last_class_ino);
1962		if (IS_ERR(class_name_dir)) {
1963			rc = PTR_ERR(class_name_dir);
1964			goto out;
1965		}
1966
1967		/* i+1 since class values are 1-indexed */
1968		rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1969				class_name_dir);
1970		if (rc)
1971			goto out;
1972	}
1973	rc = 0;
1974out:
1975	for (i = 0; i < nclasses; i++)
1976		kfree(classes[i]);
1977	kfree(classes);
1978	return rc;
1979}
1980
1981static int sel_make_policycap(struct selinux_fs_info *fsi)
1982{
1983	unsigned int iter;
1984	struct dentry *dentry = NULL;
1985	struct inode *inode = NULL;
1986
1987	for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) {
 
 
1988		if (iter < ARRAY_SIZE(selinux_policycap_names))
1989			dentry = d_alloc_name(fsi->policycap_dir,
1990					      selinux_policycap_names[iter]);
1991		else
1992			dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1993
1994		if (dentry == NULL)
1995			return -ENOMEM;
1996
1997		inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1998		if (inode == NULL) {
1999			dput(dentry);
2000			return -ENOMEM;
2001		}
2002
2003		inode->i_fop = &sel_policycap_ops;
2004		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
2005		d_add(dentry, inode);
2006	}
2007
2008	return 0;
2009}
2010
2011static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2012			unsigned long *ino)
2013{
2014	struct dentry *dentry = d_alloc_name(dir, name);
2015	struct inode *inode;
2016
2017	if (!dentry)
2018		return ERR_PTR(-ENOMEM);
2019
2020	inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2021	if (!inode) {
2022		dput(dentry);
2023		return ERR_PTR(-ENOMEM);
2024	}
2025
2026	inode->i_op = &simple_dir_inode_operations;
2027	inode->i_fop = &simple_dir_operations;
2028	inode->i_ino = ++(*ino);
2029	/* directory inodes start off with i_nlink == 2 (for "." entry) */
2030	inc_nlink(inode);
2031	d_add(dentry, inode);
2032	/* bump link count on parent directory, too */
2033	inc_nlink(d_inode(dir));
2034
2035	return dentry;
2036}
2037
2038static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2039						unsigned long *ino)
2040{
2041	struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2042
2043	if (!inode)
2044		return ERR_PTR(-ENOMEM);
2045
2046	inode->i_op = &simple_dir_inode_operations;
2047	inode->i_fop = &simple_dir_operations;
2048	inode->i_ino = ++(*ino);
2049	/* directory inodes start off with i_nlink == 2 (for "." entry) */
2050	inc_nlink(inode);
2051	return d_obtain_alias(inode);
2052}
2053
2054#define NULL_FILE_NAME "null"
2055
2056static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2057{
2058	struct selinux_fs_info *fsi;
2059	int ret;
2060	struct dentry *dentry;
2061	struct inode *inode;
2062	struct inode_security_struct *isec;
2063
2064	static const struct tree_descr selinux_files[] = {
2065		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2066		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2067		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2068		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2069		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2070		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2071		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2072		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2073		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2074		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2075		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2076		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2077		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2078		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2079		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2080		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2081		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2082		[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2083					S_IWUGO},
2084		/* last one */ {""}
2085	};
2086
2087	ret = selinux_fs_info_create(sb);
2088	if (ret)
2089		goto err;
2090
2091	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2092	if (ret)
2093		goto err;
2094
2095	fsi = sb->s_fs_info;
2096	fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2097	if (IS_ERR(fsi->bool_dir)) {
2098		ret = PTR_ERR(fsi->bool_dir);
2099		fsi->bool_dir = NULL;
2100		goto err;
2101	}
2102
2103	ret = -ENOMEM;
2104	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2105	if (!dentry)
2106		goto err;
2107
2108	ret = -ENOMEM;
2109	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2110	if (!inode) {
2111		dput(dentry);
2112		goto err;
2113	}
2114
2115	inode->i_ino = ++fsi->last_ino;
2116	isec = selinux_inode(inode);
2117	isec->sid = SECINITSID_DEVNULL;
2118	isec->sclass = SECCLASS_CHR_FILE;
2119	isec->initialized = LABEL_INITIALIZED;
2120
2121	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2122	d_add(dentry, inode);
2123
2124	dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2125	if (IS_ERR(dentry)) {
2126		ret = PTR_ERR(dentry);
2127		goto err;
2128	}
2129
2130	ret = sel_make_avc_files(dentry);
2131	if (ret)
2132		goto err;
2133
2134	dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2135	if (IS_ERR(dentry)) {
2136		ret = PTR_ERR(dentry);
2137		goto err;
2138	}
2139
2140	ret = sel_make_ss_files(dentry);
2141	if (ret)
2142		goto err;
2143
2144	dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2145	if (IS_ERR(dentry)) {
2146		ret = PTR_ERR(dentry);
2147		goto err;
2148	}
2149
2150	ret = sel_make_initcon_files(dentry);
2151	if (ret)
2152		goto err;
2153
2154	fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2155	if (IS_ERR(fsi->class_dir)) {
2156		ret = PTR_ERR(fsi->class_dir);
2157		fsi->class_dir = NULL;
2158		goto err;
2159	}
2160
2161	fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2162					  &fsi->last_ino);
2163	if (IS_ERR(fsi->policycap_dir)) {
2164		ret = PTR_ERR(fsi->policycap_dir);
2165		fsi->policycap_dir = NULL;
2166		goto err;
2167	}
2168
2169	ret = sel_make_policycap(fsi);
2170	if (ret) {
2171		pr_err("SELinux: failed to load policy capabilities\n");
2172		goto err;
2173	}
2174
2175	return 0;
2176err:
2177	pr_err("SELinux: %s:  failed while creating inodes\n",
2178		__func__);
2179
2180	selinux_fs_info_free(sb);
2181
2182	return ret;
2183}
2184
2185static int sel_get_tree(struct fs_context *fc)
2186{
2187	return get_tree_single(fc, sel_fill_super);
2188}
2189
2190static const struct fs_context_operations sel_context_ops = {
2191	.get_tree	= sel_get_tree,
2192};
2193
2194static int sel_init_fs_context(struct fs_context *fc)
2195{
2196	fc->ops = &sel_context_ops;
2197	return 0;
2198}
2199
2200static void sel_kill_sb(struct super_block *sb)
2201{
2202	selinux_fs_info_free(sb);
2203	kill_litter_super(sb);
2204}
2205
2206static struct file_system_type sel_fs_type = {
2207	.name		= "selinuxfs",
2208	.init_fs_context = sel_init_fs_context,
2209	.kill_sb	= sel_kill_sb,
2210};
2211
2212static struct vfsmount *selinuxfs_mount __ro_after_init;
2213struct path selinux_null __ro_after_init;
2214
2215static int __init init_sel_fs(void)
2216{
2217	struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2218					  sizeof(NULL_FILE_NAME)-1);
2219	int err;
2220
2221	if (!selinux_enabled_boot)
2222		return 0;
2223
2224	err = sysfs_create_mount_point(fs_kobj, "selinux");
2225	if (err)
2226		return err;
2227
2228	err = register_filesystem(&sel_fs_type);
2229	if (err) {
2230		sysfs_remove_mount_point(fs_kobj, "selinux");
2231		return err;
2232	}
2233
2234	selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2235	if (IS_ERR(selinuxfs_mount)) {
2236		pr_err("selinuxfs:  could not mount!\n");
2237		err = PTR_ERR(selinuxfs_mount);
2238		selinuxfs_mount = NULL;
2239	}
2240	selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2241						&null_name);
2242	if (IS_ERR(selinux_null.dentry)) {
2243		pr_err("selinuxfs:  could not lookup null!\n");
2244		err = PTR_ERR(selinux_null.dentry);
2245		selinux_null.dentry = NULL;
2246	}
2247
2248	return err;
2249}
2250
2251__initcall(init_sel_fs);
2252
2253#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2254void exit_sel_fs(void)
2255{
2256	sysfs_remove_mount_point(fs_kobj, "selinux");
2257	dput(selinux_null.dentry);
2258	kern_unmount(selinuxfs_mount);
2259	unregister_filesystem(&sel_fs_type);
2260}
2261#endif