1// SPDX-License-Identifier: GPL-2.0-only
   2/* Updated: Karl MacMillan <kmacmillan@tresys.com>
   3 *
   4 *	Added conditional policy language extensions
   5 *
   6 *  Updated: Hewlett-Packard <paul@paul-moore.com>
   7 *
   8 *	Added support for the policy capability bitmap
   9 *
  10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/pagemap.h>
  17#include <linux/slab.h>
  18#include <linux/vmalloc.h>
  19#include <linux/fs.h>
  20#include <linux/fs_context.h>
  21#include <linux/mount.h>
  22#include <linux/mutex.h>
 
  23#include <linux/init.h>
  24#include <linux/string.h>
  25#include <linux/security.h>
  26#include <linux/major.h>
  27#include <linux/seq_file.h>
  28#include <linux/percpu.h>
  29#include <linux/audit.h>
  30#include <linux/uaccess.h>
  31#include <linux/kobject.h>
  32#include <linux/ctype.h>
  33
  34/* selinuxfs pseudo filesystem for exporting the security policy API.
  35   Based on the proc code and the fs/nfsd/nfsctl.c code. */
  36
  37#include "flask.h"
  38#include "avc.h"
  39#include "avc_ss.h"
  40#include "security.h"
  41#include "objsec.h"
  42#include "conditional.h"
 
  43
  44enum sel_inos {
  45	SEL_ROOT_INO = 2,
  46	SEL_LOAD,	/* load policy */
  47	SEL_ENFORCE,	/* get or set enforcing status */
  48	SEL_CONTEXT,	/* validate context */
  49	SEL_ACCESS,	/* compute access decision */
  50	SEL_CREATE,	/* compute create labeling decision */
  51	SEL_RELABEL,	/* compute relabeling decision */
  52	SEL_USER,	/* compute reachable user contexts */
  53	SEL_POLICYVERS,	/* return policy version for this kernel */
  54	SEL_COMMIT_BOOLS, /* commit new boolean values */
  55	SEL_MLS,	/* return if MLS policy is enabled */
  56	SEL_DISABLE,	/* disable SELinux until next reboot */
  57	SEL_MEMBER,	/* compute polyinstantiation membership decision */
  58	SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
  59	SEL_COMPAT_NET,	/* whether to use old compat network packet controls */
  60	SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
  61	SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
  62	SEL_STATUS,	/* export current status using mmap() */
  63	SEL_POLICY,	/* allow userspace to read the in kernel policy */
  64	SEL_VALIDATE_TRANS, /* compute validatetrans decision */
  65	SEL_INO_NEXT,	/* The next inode number to use */
  66};
  67
  68struct selinux_fs_info {
  69	struct dentry *bool_dir;
  70	unsigned int bool_num;
  71	char **bool_pending_names;
  72	unsigned int *bool_pending_values;
  73	struct dentry *class_dir;
  74	unsigned long last_class_ino;
  75	bool policy_opened;
  76	struct dentry *policycap_dir;
  77	struct mutex mutex;
  78	unsigned long last_ino;
  79	struct selinux_state *state;
  80	struct super_block *sb;
  81};
  82
  83static int selinux_fs_info_create(struct super_block *sb)
  84{
  85	struct selinux_fs_info *fsi;
  86
  87	fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
  88	if (!fsi)
  89		return -ENOMEM;
  90
  91	mutex_init(&fsi->mutex);
  92	fsi->last_ino = SEL_INO_NEXT - 1;
  93	fsi->state = &selinux_state;
  94	fsi->sb = sb;
  95	sb->s_fs_info = fsi;
  96	return 0;
  97}
  98
  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 TMPBUFLEN	12
 121static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 122				size_t count, loff_t *ppos)
 123{
 124	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 125	char tmpbuf[TMPBUFLEN];
 126	ssize_t length;
 127
 128	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 129			   enforcing_enabled(fsi->state));
 130	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 131}
 132
 133#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 134static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 135				 size_t count, loff_t *ppos)
 136
 137{
 138	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 139	struct selinux_state *state = fsi->state;
 140	char *page = NULL;
 141	ssize_t length;
 142	int old_value, new_value;
 
 143
 144	if (count >= PAGE_SIZE)
 145		return -ENOMEM;
 146
 147	/* No partial writes. */
 148	if (*ppos != 0)
 149		return -EINVAL;
 150
 151	page = memdup_user_nul(buf, count);
 152	if (IS_ERR(page))
 153		return PTR_ERR(page);
 154
 155	length = -EINVAL;
 156	if (sscanf(page, "%d", &new_value) != 1)
 157		goto out;
 158
 159	new_value = !!new_value;
 160
 161	old_value = enforcing_enabled(state);
 162	if (new_value != old_value) {
 163		length = avc_has_perm(&selinux_state,
 164				      current_sid(), SECINITSID_SECURITY,
 165				      SECCLASS_SECURITY, SECURITY__SETENFORCE,
 166				      NULL);
 167		if (length)
 168			goto out;
 169		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 170			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
 171			" enabled=1 old-enabled=1 lsm=selinux res=1",
 172			new_value, old_value,
 173			from_kuid(&init_user_ns, audit_get_loginuid(current)),
 174			audit_get_sessionid(current));
 175		enforcing_set(state, new_value);
 176		if (new_value)
 177			avc_ss_reset(state->avc, 0);
 178		selnl_notify_setenforce(new_value);
 179		selinux_status_update_setenforce(state, new_value);
 180		if (!new_value)
 181			call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
 
 
 182	}
 183	length = count;
 184out:
 185	kfree(page);
 186	return length;
 187}
 188#else
 189#define sel_write_enforce NULL
 190#endif
 191
 192static const struct file_operations sel_enforce_ops = {
 193	.read		= sel_read_enforce,
 194	.write		= sel_write_enforce,
 195	.llseek		= generic_file_llseek,
 196};
 197
 198static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 199					size_t count, loff_t *ppos)
 200{
 201	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 202	struct selinux_state *state = fsi->state;
 203	char tmpbuf[TMPBUFLEN];
 204	ssize_t length;
 205	ino_t ino = file_inode(filp)->i_ino;
 206	int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 207		security_get_reject_unknown(state) :
 208		!security_get_allow_unknown(state);
 209
 210	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 211	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 212}
 213
 214static const struct file_operations sel_handle_unknown_ops = {
 215	.read		= sel_read_handle_unknown,
 216	.llseek		= generic_file_llseek,
 217};
 218
 219static int sel_open_handle_status(struct inode *inode, struct file *filp)
 220{
 221	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 222	struct page    *status = selinux_kernel_status_page(fsi->state);
 223
 224	if (!status)
 225		return -ENOMEM;
 226
 227	filp->private_data = status;
 228
 229	return 0;
 230}
 231
 232static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
 233				      size_t count, loff_t *ppos)
 234{
 235	struct page    *status = filp->private_data;
 236
 237	BUG_ON(!status);
 238
 239	return simple_read_from_buffer(buf, count, ppos,
 240				       page_address(status),
 241				       sizeof(struct selinux_kernel_status));
 242}
 243
 244static int sel_mmap_handle_status(struct file *filp,
 245				  struct vm_area_struct *vma)
 246{
 247	struct page    *status = filp->private_data;
 248	unsigned long	size = vma->vm_end - vma->vm_start;
 249
 250	BUG_ON(!status);
 251
 252	/* only allows one page from the head */
 253	if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
 254		return -EIO;
 255	/* disallow writable mapping */
 256	if (vma->vm_flags & VM_WRITE)
 257		return -EPERM;
 258	/* disallow mprotect() turns it into writable */
 259	vma->vm_flags &= ~VM_MAYWRITE;
 260
 261	return remap_pfn_range(vma, vma->vm_start,
 262			       page_to_pfn(status),
 263			       size, vma->vm_page_prot);
 264}
 265
 266static const struct file_operations sel_handle_status_ops = {
 267	.open		= sel_open_handle_status,
 268	.read		= sel_read_handle_status,
 269	.mmap		= sel_mmap_handle_status,
 270	.llseek		= generic_file_llseek,
 271};
 272
 273#ifdef CONFIG_SECURITY_SELINUX_DISABLE
 274static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 275				 size_t count, loff_t *ppos)
 276
 277{
 278	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 279	char *page;
 280	ssize_t length;
 281	int new_value;
 282	int enforcing;
 283
 284	/* NOTE: we are now officially considering runtime disable as
 285	 *       deprecated, and using it will become increasingly painful
 286	 *       (e.g. sleeping/blocking) as we progress through future
 287	 *       kernel releases until eventually it is removed
 288	 */
 289	pr_err("SELinux:  Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
 290
 291	if (count >= PAGE_SIZE)
 292		return -ENOMEM;
 293
 294	/* No partial writes. */
 295	if (*ppos != 0)
 296		return -EINVAL;
 297
 298	page = memdup_user_nul(buf, count);
 299	if (IS_ERR(page))
 300		return PTR_ERR(page);
 301
 302	length = -EINVAL;
 303	if (sscanf(page, "%d", &new_value) != 1)
 304		goto out;
 
 
 305
 306	if (new_value) {
 307		enforcing = enforcing_enabled(fsi->state);
 308		length = selinux_disable(fsi->state);
 309		if (length)
 310			goto out;
 311		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 312			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
 313			" enabled=0 old-enabled=1 lsm=selinux res=1",
 314			enforcing, enforcing,
 315			from_kuid(&init_user_ns, audit_get_loginuid(current)),
 316			audit_get_sessionid(current));
 317	}
 318
 319	length = count;
 320out:
 321	kfree(page);
 322	return length;
 323}
 324#else
 325#define sel_write_disable NULL
 326#endif
 327
 328static const struct file_operations sel_disable_ops = {
 329	.write		= sel_write_disable,
 330	.llseek		= generic_file_llseek,
 331};
 332
 333static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 334				   size_t count, loff_t *ppos)
 335{
 336	char tmpbuf[TMPBUFLEN];
 337	ssize_t length;
 338
 339	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 340	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 341}
 342
 343static const struct file_operations sel_policyvers_ops = {
 344	.read		= sel_read_policyvers,
 345	.llseek		= generic_file_llseek,
 346};
 347
 348/* declaration for sel_write_load */
 349static int sel_make_bools(struct selinux_fs_info *fsi);
 350static int sel_make_classes(struct selinux_fs_info *fsi);
 351static int sel_make_policycap(struct selinux_fs_info *fsi);
 
 
 
 352
 353/* declaration for sel_make_class_dirs */
 354static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 355			unsigned long *ino);
 356
 
 
 
 
 357static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 358				size_t count, loff_t *ppos)
 359{
 360	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 361	char tmpbuf[TMPBUFLEN];
 362	ssize_t length;
 363
 364	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 365			   security_mls_enabled(fsi->state));
 366	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 367}
 368
 369static const struct file_operations sel_mls_ops = {
 370	.read		= sel_read_mls,
 371	.llseek		= generic_file_llseek,
 372};
 373
 374struct policy_load_memory {
 375	size_t len;
 376	void *data;
 377};
 378
 379static int sel_open_policy(struct inode *inode, struct file *filp)
 380{
 381	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 382	struct selinux_state *state = fsi->state;
 383	struct policy_load_memory *plm = NULL;
 384	int rc;
 385
 386	BUG_ON(filp->private_data);
 387
 388	mutex_lock(&fsi->mutex);
 389
 390	rc = avc_has_perm(&selinux_state,
 391			  current_sid(), SECINITSID_SECURITY,
 392			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 393	if (rc)
 394		goto err;
 395
 396	rc = -EBUSY;
 397	if (fsi->policy_opened)
 398		goto err;
 399
 400	rc = -ENOMEM;
 401	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 402	if (!plm)
 403		goto err;
 404
 405	if (i_size_read(inode) != security_policydb_len(state)) {
 
 
 
 
 406		inode_lock(inode);
 407		i_size_write(inode, security_policydb_len(state));
 408		inode_unlock(inode);
 409	}
 410
 411	rc = security_read_policy(state, &plm->data, &plm->len);
 412	if (rc)
 413		goto err;
 414
 415	fsi->policy_opened = 1;
 416
 417	filp->private_data = plm;
 418
 419	mutex_unlock(&fsi->mutex);
 420
 421	return 0;
 422err:
 423	mutex_unlock(&fsi->mutex);
 424
 425	if (plm)
 426		vfree(plm->data);
 427	kfree(plm);
 428	return rc;
 429}
 430
 431static int sel_release_policy(struct inode *inode, struct file *filp)
 432{
 433	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 434	struct policy_load_memory *plm = filp->private_data;
 435
 436	BUG_ON(!plm);
 437
 438	fsi->policy_opened = 0;
 439
 440	vfree(plm->data);
 441	kfree(plm);
 442
 443	return 0;
 444}
 445
 446static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 447			       size_t count, loff_t *ppos)
 448{
 449	struct policy_load_memory *plm = filp->private_data;
 450	int ret;
 451
 452	ret = avc_has_perm(&selinux_state,
 453			   current_sid(), SECINITSID_SECURITY,
 454			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 455	if (ret)
 456		return ret;
 457
 458	return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 459}
 460
 461static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
 462{
 463	struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
 464	unsigned long offset;
 465	struct page *page;
 466
 467	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 468		return VM_FAULT_SIGBUS;
 469
 470	offset = vmf->pgoff << PAGE_SHIFT;
 471	if (offset >= roundup(plm->len, PAGE_SIZE))
 472		return VM_FAULT_SIGBUS;
 473
 474	page = vmalloc_to_page(plm->data + offset);
 475	get_page(page);
 476
 477	vmf->page = page;
 478
 479	return 0;
 480}
 481
 482static const struct vm_operations_struct sel_mmap_policy_ops = {
 483	.fault = sel_mmap_policy_fault,
 484	.page_mkwrite = sel_mmap_policy_fault,
 485};
 486
 487static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 488{
 489	if (vma->vm_flags & VM_SHARED) {
 490		/* do not allow mprotect to make mapping writable */
 491		vma->vm_flags &= ~VM_MAYWRITE;
 492
 493		if (vma->vm_flags & VM_WRITE)
 494			return -EACCES;
 495	}
 496
 497	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 498	vma->vm_ops = &sel_mmap_policy_ops;
 499
 500	return 0;
 501}
 502
 503static const struct file_operations sel_policy_ops = {
 504	.open		= sel_open_policy,
 505	.read		= sel_read_policy,
 506	.mmap		= sel_mmap_policy,
 507	.release	= sel_release_policy,
 508	.llseek		= generic_file_llseek,
 509};
 510
 511static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
 
 512{
 513	int ret;
 514
 515	ret = sel_make_bools(fsi);
 516	if (ret) {
 517		pr_err("SELinux: failed to load policy booleans\n");
 518		return ret;
 519	}
 
 520
 521	ret = sel_make_classes(fsi);
 522	if (ret) {
 523		pr_err("SELinux: failed to load policy classes\n");
 524		return ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 525	}
 526
 527	ret = sel_make_policycap(fsi);
 528	if (ret) {
 529		pr_err("SELinux: failed to load policy capabilities\n");
 530		return ret;
 
 531	}
 532
 533	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 534}
 535
 536static ssize_t sel_write_load(struct file *file, const char __user *buf,
 537			      size_t count, loff_t *ppos)
 538
 539{
 540	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 
 541	ssize_t length;
 542	void *data = NULL;
 543
 544	mutex_lock(&fsi->mutex);
 
 
 
 
 
 
 
 545
 546	length = avc_has_perm(&selinux_state,
 547			      current_sid(), SECINITSID_SECURITY,
 548			      SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
 549	if (length)
 550		goto out;
 551
 552	/* No partial writes. */
 553	length = -EINVAL;
 554	if (*ppos != 0)
 555		goto out;
 556
 557	length = -ENOMEM;
 558	data = vmalloc(count);
 559	if (!data)
 
 560		goto out;
 561
 562	length = -EFAULT;
 563	if (copy_from_user(data, buf, count) != 0)
 564		goto out;
 
 565
 566	length = security_load_policy(fsi->state, data, count);
 567	if (length) {
 568		pr_warn_ratelimited("SELinux: failed to load policy\n");
 569		goto out;
 570	}
 
 
 
 
 
 
 
 571
 572	length = sel_make_policy_nodes(fsi);
 573	if (length)
 574		goto out1;
 575
 576	length = count;
 577
 578out1:
 579	audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 580		"auid=%u ses=%u lsm=selinux res=1",
 581		from_kuid(&init_user_ns, audit_get_loginuid(current)),
 582		audit_get_sessionid(current));
 
 583out:
 584	mutex_unlock(&fsi->mutex);
 585	vfree(data);
 586	return length;
 587}
 588
 589static const struct file_operations sel_load_ops = {
 590	.write		= sel_write_load,
 591	.llseek		= generic_file_llseek,
 592};
 593
 594static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 595{
 596	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 597	struct selinux_state *state = fsi->state;
 598	char *canon = NULL;
 599	u32 sid, len;
 600	ssize_t length;
 601
 602	length = avc_has_perm(&selinux_state,
 603			      current_sid(), SECINITSID_SECURITY,
 604			      SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
 605	if (length)
 606		goto out;
 607
 608	length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
 609	if (length)
 610		goto out;
 611
 612	length = security_sid_to_context(state, sid, &canon, &len);
 613	if (length)
 614		goto out;
 615
 616	length = -ERANGE;
 617	if (len > SIMPLE_TRANSACTION_LIMIT) {
 618		pr_err("SELinux: %s:  context size (%u) exceeds "
 619			"payload max\n", __func__, len);
 620		goto out;
 621	}
 622
 623	memcpy(buf, canon, len);
 624	length = len;
 625out:
 626	kfree(canon);
 627	return length;
 628}
 629
 630static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 631				     size_t count, loff_t *ppos)
 632{
 633	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 634	char tmpbuf[TMPBUFLEN];
 635	ssize_t length;
 636
 637	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
 
 638	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 639}
 640
 641static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 642				      size_t count, loff_t *ppos)
 643{
 644	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 645	char *page;
 646	ssize_t length;
 647	unsigned int new_value;
 648
 649	length = avc_has_perm(&selinux_state,
 650			      current_sid(), SECINITSID_SECURITY,
 651			      SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
 652			      NULL);
 653	if (length)
 654		return length;
 655
 656	if (count >= PAGE_SIZE)
 657		return -ENOMEM;
 658
 659	/* No partial writes. */
 660	if (*ppos != 0)
 661		return -EINVAL;
 662
 663	page = memdup_user_nul(buf, count);
 664	if (IS_ERR(page))
 665		return PTR_ERR(page);
 666
 667	length = -EINVAL;
 668	if (sscanf(page, "%u", &new_value) != 1)
 669		goto out;
 
 
 670
 671	if (new_value) {
 672		char comm[sizeof(current->comm)];
 673
 674		memcpy(comm, current->comm, sizeof(comm));
 675		pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
 676			     comm, current->pid);
 677	}
 678
 679	fsi->state->checkreqprot = new_value ? 1 : 0;
 680	length = count;
 681out:
 682	kfree(page);
 683	return length;
 684}
 685static const struct file_operations sel_checkreqprot_ops = {
 686	.read		= sel_read_checkreqprot,
 687	.write		= sel_write_checkreqprot,
 688	.llseek		= generic_file_llseek,
 689};
 690
 691static ssize_t sel_write_validatetrans(struct file *file,
 692					const char __user *buf,
 693					size_t count, loff_t *ppos)
 694{
 695	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 696	struct selinux_state *state = fsi->state;
 697	char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
 698	char *req = NULL;
 699	u32 osid, nsid, tsid;
 700	u16 tclass;
 701	int rc;
 702
 703	rc = avc_has_perm(&selinux_state,
 704			  current_sid(), SECINITSID_SECURITY,
 705			  SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
 706	if (rc)
 707		goto out;
 708
 709	rc = -ENOMEM;
 710	if (count >= PAGE_SIZE)
 711		goto out;
 712
 713	/* No partial writes. */
 714	rc = -EINVAL;
 715	if (*ppos != 0)
 716		goto out;
 717
 718	req = memdup_user_nul(buf, count);
 719	if (IS_ERR(req)) {
 720		rc = PTR_ERR(req);
 721		req = NULL;
 722		goto out;
 723	}
 724
 725	rc = -ENOMEM;
 726	oldcon = kzalloc(count + 1, GFP_KERNEL);
 727	if (!oldcon)
 728		goto out;
 729
 730	newcon = kzalloc(count + 1, GFP_KERNEL);
 731	if (!newcon)
 732		goto out;
 733
 734	taskcon = kzalloc(count + 1, GFP_KERNEL);
 735	if (!taskcon)
 736		goto out;
 737
 738	rc = -EINVAL;
 739	if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
 740		goto out;
 741
 742	rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
 743	if (rc)
 744		goto out;
 745
 746	rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
 747	if (rc)
 748		goto out;
 749
 750	rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
 751	if (rc)
 752		goto out;
 753
 754	rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
 755	if (!rc)
 756		rc = count;
 757out:
 758	kfree(req);
 759	kfree(oldcon);
 760	kfree(newcon);
 761	kfree(taskcon);
 762	return rc;
 763}
 764
 765static const struct file_operations sel_transition_ops = {
 766	.write		= sel_write_validatetrans,
 767	.llseek		= generic_file_llseek,
 768};
 769
 770/*
 771 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 772 */
 773static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 774static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 775static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 776static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 777static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 778
 779static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
 780	[SEL_ACCESS] = sel_write_access,
 781	[SEL_CREATE] = sel_write_create,
 782	[SEL_RELABEL] = sel_write_relabel,
 783	[SEL_USER] = sel_write_user,
 784	[SEL_MEMBER] = sel_write_member,
 785	[SEL_CONTEXT] = sel_write_context,
 786};
 787
 788static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 789{
 790	ino_t ino = file_inode(file)->i_ino;
 791	char *data;
 792	ssize_t rv;
 793
 794	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 795		return -EINVAL;
 796
 797	data = simple_transaction_get(file, buf, size);
 798	if (IS_ERR(data))
 799		return PTR_ERR(data);
 800
 801	rv = write_op[ino](file, data, size);
 802	if (rv > 0) {
 803		simple_transaction_set(file, rv);
 804		rv = size;
 805	}
 806	return rv;
 807}
 808
 809static const struct file_operations transaction_ops = {
 810	.write		= selinux_transaction_write,
 811	.read		= simple_transaction_read,
 812	.release	= simple_transaction_release,
 813	.llseek		= generic_file_llseek,
 814};
 815
 816/*
 817 * payload - write methods
 818 * If the method has a response, the response should be put in buf,
 819 * and the length returned.  Otherwise return 0 or and -error.
 820 */
 821
 822static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 823{
 824	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 825	struct selinux_state *state = fsi->state;
 826	char *scon = NULL, *tcon = NULL;
 827	u32 ssid, tsid;
 828	u16 tclass;
 829	struct av_decision avd;
 830	ssize_t length;
 831
 832	length = avc_has_perm(&selinux_state,
 833			      current_sid(), SECINITSID_SECURITY,
 834			      SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
 835	if (length)
 836		goto out;
 837
 838	length = -ENOMEM;
 839	scon = kzalloc(size + 1, GFP_KERNEL);
 840	if (!scon)
 841		goto out;
 842
 843	length = -ENOMEM;
 844	tcon = kzalloc(size + 1, GFP_KERNEL);
 845	if (!tcon)
 846		goto out;
 847
 848	length = -EINVAL;
 849	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 850		goto out;
 851
 852	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
 853	if (length)
 854		goto out;
 855
 856	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
 857	if (length)
 858		goto out;
 859
 860	security_compute_av_user(state, ssid, tsid, tclass, &avd);
 861
 862	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 863			  "%x %x %x %x %u %x",
 864			  avd.allowed, 0xffffffff,
 865			  avd.auditallow, avd.auditdeny,
 866			  avd.seqno, avd.flags);
 867out:
 868	kfree(tcon);
 869	kfree(scon);
 870	return length;
 871}
 872
 873static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 874{
 875	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 876	struct selinux_state *state = fsi->state;
 877	char *scon = NULL, *tcon = NULL;
 878	char *namebuf = NULL, *objname = NULL;
 879	u32 ssid, tsid, newsid;
 880	u16 tclass;
 881	ssize_t length;
 882	char *newcon = NULL;
 883	u32 len;
 884	int nargs;
 885
 886	length = avc_has_perm(&selinux_state,
 887			      current_sid(), SECINITSID_SECURITY,
 888			      SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
 889			      NULL);
 890	if (length)
 891		goto out;
 892
 893	length = -ENOMEM;
 894	scon = kzalloc(size + 1, GFP_KERNEL);
 895	if (!scon)
 896		goto out;
 897
 898	length = -ENOMEM;
 899	tcon = kzalloc(size + 1, GFP_KERNEL);
 900	if (!tcon)
 901		goto out;
 902
 903	length = -ENOMEM;
 904	namebuf = kzalloc(size + 1, GFP_KERNEL);
 905	if (!namebuf)
 906		goto out;
 907
 908	length = -EINVAL;
 909	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
 910	if (nargs < 3 || nargs > 4)
 911		goto out;
 912	if (nargs == 4) {
 913		/*
 914		 * If and when the name of new object to be queried contains
 915		 * either whitespace or multibyte characters, they shall be
 916		 * encoded based on the percentage-encoding rule.
 917		 * If not encoded, the sscanf logic picks up only left-half
 918		 * of the supplied name; splitted by a whitespace unexpectedly.
 919		 */
 920		char   *r, *w;
 921		int     c1, c2;
 922
 923		r = w = namebuf;
 924		do {
 925			c1 = *r++;
 926			if (c1 == '+')
 927				c1 = ' ';
 928			else if (c1 == '%') {
 929				c1 = hex_to_bin(*r++);
 930				if (c1 < 0)
 931					goto out;
 932				c2 = hex_to_bin(*r++);
 933				if (c2 < 0)
 934					goto out;
 935				c1 = (c1 << 4) | c2;
 936			}
 937			*w++ = c1;
 938		} while (c1 != '\0');
 939
 940		objname = namebuf;
 941	}
 942
 943	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
 944	if (length)
 945		goto out;
 946
 947	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
 948	if (length)
 949		goto out;
 950
 951	length = security_transition_sid_user(state, ssid, tsid, tclass,
 952					      objname, &newsid);
 953	if (length)
 954		goto out;
 955
 956	length = security_sid_to_context(state, newsid, &newcon, &len);
 957	if (length)
 958		goto out;
 959
 960	length = -ERANGE;
 961	if (len > SIMPLE_TRANSACTION_LIMIT) {
 962		pr_err("SELinux: %s:  context size (%u) exceeds "
 963			"payload max\n", __func__, len);
 964		goto out;
 965	}
 966
 967	memcpy(buf, newcon, len);
 968	length = len;
 969out:
 970	kfree(newcon);
 971	kfree(namebuf);
 972	kfree(tcon);
 973	kfree(scon);
 974	return length;
 975}
 976
 977static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 978{
 979	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 980	struct selinux_state *state = fsi->state;
 981	char *scon = NULL, *tcon = NULL;
 982	u32 ssid, tsid, newsid;
 983	u16 tclass;
 984	ssize_t length;
 985	char *newcon = NULL;
 986	u32 len;
 987
 988	length = avc_has_perm(&selinux_state,
 989			      current_sid(), SECINITSID_SECURITY,
 990			      SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
 991			      NULL);
 992	if (length)
 993		goto out;
 994
 995	length = -ENOMEM;
 996	scon = kzalloc(size + 1, GFP_KERNEL);
 997	if (!scon)
 998		goto out;
 999
1000	length = -ENOMEM;
1001	tcon = kzalloc(size + 1, GFP_KERNEL);
1002	if (!tcon)
1003		goto out;
1004
1005	length = -EINVAL;
1006	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1007		goto out;
1008
1009	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1010	if (length)
1011		goto out;
1012
1013	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1014	if (length)
1015		goto out;
1016
1017	length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1018	if (length)
1019		goto out;
1020
1021	length = security_sid_to_context(state, newsid, &newcon, &len);
1022	if (length)
1023		goto out;
1024
1025	length = -ERANGE;
1026	if (len > SIMPLE_TRANSACTION_LIMIT)
1027		goto out;
1028
1029	memcpy(buf, newcon, len);
1030	length = len;
1031out:
1032	kfree(newcon);
1033	kfree(tcon);
1034	kfree(scon);
1035	return length;
1036}
1037
1038static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1039{
1040	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1041	struct selinux_state *state = fsi->state;
1042	char *con = NULL, *user = NULL, *ptr;
1043	u32 sid, *sids = NULL;
1044	ssize_t length;
1045	char *newcon;
1046	int i, rc;
1047	u32 len, nsids;
1048
1049	length = avc_has_perm(&selinux_state,
1050			      current_sid(), SECINITSID_SECURITY,
 
 
 
1051			      SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1052			      NULL);
1053	if (length)
1054		goto out;
1055
1056	length = -ENOMEM;
1057	con = kzalloc(size + 1, GFP_KERNEL);
1058	if (!con)
1059		goto out;
1060
1061	length = -ENOMEM;
1062	user = kzalloc(size + 1, GFP_KERNEL);
1063	if (!user)
1064		goto out;
1065
1066	length = -EINVAL;
1067	if (sscanf(buf, "%s %s", con, user) != 2)
1068		goto out;
1069
1070	length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1071	if (length)
1072		goto out;
1073
1074	length = security_get_user_sids(state, sid, user, &sids, &nsids);
1075	if (length)
1076		goto out;
1077
1078	length = sprintf(buf, "%u", nsids) + 1;
1079	ptr = buf + length;
1080	for (i = 0; i < nsids; i++) {
1081		rc = security_sid_to_context(state, sids[i], &newcon, &len);
1082		if (rc) {
1083			length = rc;
1084			goto out;
1085		}
1086		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1087			kfree(newcon);
1088			length = -ERANGE;
1089			goto out;
1090		}
1091		memcpy(ptr, newcon, len);
1092		kfree(newcon);
1093		ptr += len;
1094		length += len;
1095	}
1096out:
1097	kfree(sids);
1098	kfree(user);
1099	kfree(con);
1100	return length;
1101}
1102
1103static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1104{
1105	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1106	struct selinux_state *state = fsi->state;
1107	char *scon = NULL, *tcon = NULL;
1108	u32 ssid, tsid, newsid;
1109	u16 tclass;
1110	ssize_t length;
1111	char *newcon = NULL;
1112	u32 len;
1113
1114	length = avc_has_perm(&selinux_state,
1115			      current_sid(), SECINITSID_SECURITY,
1116			      SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1117			      NULL);
1118	if (length)
1119		goto out;
1120
1121	length = -ENOMEM;
1122	scon = kzalloc(size + 1, GFP_KERNEL);
1123	if (!scon)
1124		goto out;
1125
1126	length = -ENOMEM;
1127	tcon = kzalloc(size + 1, GFP_KERNEL);
1128	if (!tcon)
1129		goto out;
1130
1131	length = -EINVAL;
1132	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1133		goto out;
1134
1135	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1136	if (length)
1137		goto out;
1138
1139	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1140	if (length)
1141		goto out;
1142
1143	length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1144	if (length)
1145		goto out;
1146
1147	length = security_sid_to_context(state, newsid, &newcon, &len);
1148	if (length)
1149		goto out;
1150
1151	length = -ERANGE;
1152	if (len > SIMPLE_TRANSACTION_LIMIT) {
1153		pr_err("SELinux: %s:  context size (%u) exceeds "
1154			"payload max\n", __func__, len);
1155		goto out;
1156	}
1157
1158	memcpy(buf, newcon, len);
1159	length = len;
1160out:
1161	kfree(newcon);
1162	kfree(tcon);
1163	kfree(scon);
1164	return length;
1165}
1166
1167static struct inode *sel_make_inode(struct super_block *sb, int mode)
1168{
1169	struct inode *ret = new_inode(sb);
1170
1171	if (ret) {
1172		ret->i_mode = mode;
1173		ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1174	}
1175	return ret;
1176}
1177
1178static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1179			     size_t count, loff_t *ppos)
1180{
1181	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1182	char *page = NULL;
1183	ssize_t length;
1184	ssize_t ret;
1185	int cur_enforcing;
1186	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1187	const char *name = filep->f_path.dentry->d_name.name;
1188
1189	mutex_lock(&fsi->mutex);
1190
1191	ret = -EINVAL;
1192	if (index >= fsi->bool_num || strcmp(name,
1193					     fsi->bool_pending_names[index]))
1194		goto out_unlock;
1195
1196	ret = -ENOMEM;
1197	page = (char *)get_zeroed_page(GFP_KERNEL);
1198	if (!page)
1199		goto out_unlock;
1200
1201	cur_enforcing = security_get_bool_value(fsi->state, index);
1202	if (cur_enforcing < 0) {
1203		ret = cur_enforcing;
1204		goto out_unlock;
1205	}
1206	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1207			  fsi->bool_pending_values[index]);
1208	mutex_unlock(&fsi->mutex);
1209	ret = simple_read_from_buffer(buf, count, ppos, page, length);
1210out_free:
1211	free_page((unsigned long)page);
1212	return ret;
1213
1214out_unlock:
1215	mutex_unlock(&fsi->mutex);
1216	goto out_free;
1217}
1218
1219static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1220			      size_t count, loff_t *ppos)
1221{
1222	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1223	char *page = NULL;
1224	ssize_t length;
1225	int new_value;
1226	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1227	const char *name = filep->f_path.dentry->d_name.name;
1228
1229	if (count >= PAGE_SIZE)
1230		return -ENOMEM;
1231
1232	/* No partial writes. */
1233	if (*ppos != 0)
1234		return -EINVAL;
1235
1236	page = memdup_user_nul(buf, count);
1237	if (IS_ERR(page))
1238		return PTR_ERR(page);
1239
1240	mutex_lock(&fsi->mutex);
1241
1242	length = avc_has_perm(&selinux_state,
1243			      current_sid(), SECINITSID_SECURITY,
1244			      SECCLASS_SECURITY, SECURITY__SETBOOL,
1245			      NULL);
1246	if (length)
1247		goto out;
1248
1249	length = -EINVAL;
1250	if (index >= fsi->bool_num || strcmp(name,
1251					     fsi->bool_pending_names[index]))
1252		goto out;
1253
1254	length = -EINVAL;
1255	if (sscanf(page, "%d", &new_value) != 1)
1256		goto out;
1257
1258	if (new_value)
1259		new_value = 1;
1260
1261	fsi->bool_pending_values[index] = new_value;
1262	length = count;
1263
1264out:
1265	mutex_unlock(&fsi->mutex);
1266	kfree(page);
1267	return length;
1268}
1269
1270static const struct file_operations sel_bool_ops = {
1271	.read		= sel_read_bool,
1272	.write		= sel_write_bool,
1273	.llseek		= generic_file_llseek,
1274};
1275
1276static ssize_t sel_commit_bools_write(struct file *filep,
1277				      const char __user *buf,
1278				      size_t count, loff_t *ppos)
1279{
1280	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1281	char *page = NULL;
1282	ssize_t length;
1283	int new_value;
1284
1285	if (count >= PAGE_SIZE)
1286		return -ENOMEM;
1287
1288	/* No partial writes. */
1289	if (*ppos != 0)
1290		return -EINVAL;
1291
1292	page = memdup_user_nul(buf, count);
1293	if (IS_ERR(page))
1294		return PTR_ERR(page);
1295
1296	mutex_lock(&fsi->mutex);
1297
1298	length = avc_has_perm(&selinux_state,
1299			      current_sid(), SECINITSID_SECURITY,
1300			      SECCLASS_SECURITY, SECURITY__SETBOOL,
1301			      NULL);
1302	if (length)
1303		goto out;
1304
1305	length = -EINVAL;
1306	if (sscanf(page, "%d", &new_value) != 1)
1307		goto out;
1308
1309	length = 0;
1310	if (new_value && fsi->bool_pending_values)
1311		length = security_set_bools(fsi->state, fsi->bool_num,
1312					    fsi->bool_pending_values);
1313
1314	if (!length)
1315		length = count;
1316
1317out:
1318	mutex_unlock(&fsi->mutex);
1319	kfree(page);
1320	return length;
1321}
1322
1323static const struct file_operations sel_commit_bools_ops = {
1324	.write		= sel_commit_bools_write,
1325	.llseek		= generic_file_llseek,
1326};
1327
1328static void sel_remove_entries(struct dentry *de)
1329{
1330	d_genocide(de);
1331	shrink_dcache_parent(de);
1332}
1333
1334#define BOOL_DIR_NAME "booleans"
1335
1336static int sel_make_bools(struct selinux_fs_info *fsi)
1337{
1338	int ret;
1339	ssize_t len;
1340	struct dentry *dentry = NULL;
1341	struct dentry *dir = fsi->bool_dir;
1342	struct inode *inode = NULL;
1343	struct inode_security_struct *isec;
1344	char **names = NULL, *page;
1345	u32 i, num;
1346	int *values = NULL;
1347	u32 sid;
1348
1349	/* remove any existing files */
1350	for (i = 0; i < fsi->bool_num; i++)
1351		kfree(fsi->bool_pending_names[i]);
1352	kfree(fsi->bool_pending_names);
1353	kfree(fsi->bool_pending_values);
1354	fsi->bool_num = 0;
1355	fsi->bool_pending_names = NULL;
1356	fsi->bool_pending_values = NULL;
1357
1358	sel_remove_entries(dir);
1359
1360	ret = -ENOMEM;
1361	page = (char *)get_zeroed_page(GFP_KERNEL);
1362	if (!page)
1363		goto out;
1364
1365	ret = security_get_bools(fsi->state, &num, &names, &values);
1366	if (ret)
1367		goto out;
1368
1369	for (i = 0; i < num; i++) {
1370		ret = -ENOMEM;
1371		dentry = d_alloc_name(dir, names[i]);
1372		if (!dentry)
1373			goto out;
1374
1375		ret = -ENOMEM;
1376		inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1377		if (!inode) {
1378			dput(dentry);
1379			goto out;
1380		}
1381
1382		ret = -ENAMETOOLONG;
1383		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1384		if (len >= PAGE_SIZE) {
 
 
 
 
 
 
 
 
 
 
 
1385			dput(dentry);
1386			iput(inode);
1387			goto out;
1388		}
1389
1390		isec = selinux_inode(inode);
1391		ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1392					 SECCLASS_FILE, &sid);
1393		if (ret) {
1394			pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1395					   page);
1396			sid = SECINITSID_SECURITY;
1397		}
1398
1399		isec->sid = sid;
1400		isec->initialized = LABEL_INITIALIZED;
1401		inode->i_fop = &sel_bool_ops;
1402		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1403		d_add(dentry, inode);
1404	}
1405	fsi->bool_num = num;
1406	fsi->bool_pending_names = names;
1407	fsi->bool_pending_values = values;
1408
1409	free_page((unsigned long)page);
1410	return 0;
1411out:
1412	free_page((unsigned long)page);
1413
1414	if (names) {
1415		for (i = 0; i < num; i++)
1416			kfree(names[i]);
1417		kfree(names);
1418	}
1419	kfree(values);
1420	sel_remove_entries(dir);
1421
1422	return ret;
1423}
1424
1425static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1426					    size_t count, loff_t *ppos)
1427{
1428	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1429	struct selinux_state *state = fsi->state;
1430	char tmpbuf[TMPBUFLEN];
1431	ssize_t length;
1432
1433	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1434			   avc_get_cache_threshold(state->avc));
1435	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1436}
1437
1438static ssize_t sel_write_avc_cache_threshold(struct file *file,
1439					     const char __user *buf,
1440					     size_t count, loff_t *ppos)
1441
1442{
1443	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1444	struct selinux_state *state = fsi->state;
1445	char *page;
1446	ssize_t ret;
1447	unsigned int new_value;
1448
1449	ret = avc_has_perm(&selinux_state,
1450			   current_sid(), SECINITSID_SECURITY,
1451			   SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1452			   NULL);
1453	if (ret)
1454		return ret;
1455
1456	if (count >= PAGE_SIZE)
1457		return -ENOMEM;
1458
1459	/* No partial writes. */
1460	if (*ppos != 0)
1461		return -EINVAL;
1462
1463	page = memdup_user_nul(buf, count);
1464	if (IS_ERR(page))
1465		return PTR_ERR(page);
1466
1467	ret = -EINVAL;
1468	if (sscanf(page, "%u", &new_value) != 1)
1469		goto out;
1470
1471	avc_set_cache_threshold(state->avc, new_value);
1472
1473	ret = count;
1474out:
1475	kfree(page);
1476	return ret;
1477}
1478
1479static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1480				       size_t count, loff_t *ppos)
1481{
1482	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1483	struct selinux_state *state = fsi->state;
1484	char *page;
1485	ssize_t length;
1486
1487	page = (char *)__get_free_page(GFP_KERNEL);
1488	if (!page)
1489		return -ENOMEM;
1490
1491	length = avc_get_hash_stats(state->avc, page);
1492	if (length >= 0)
1493		length = simple_read_from_buffer(buf, count, ppos, page, length);
1494	free_page((unsigned long)page);
1495
1496	return length;
1497}
1498
1499static ssize_t sel_read_sidtab_hash_stats(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 *page;
1505	ssize_t length;
1506
1507	page = (char *)__get_free_page(GFP_KERNEL);
1508	if (!page)
1509		return -ENOMEM;
1510
1511	length = security_sidtab_hash_stats(state, page);
1512	if (length >= 0)
1513		length = simple_read_from_buffer(buf, count, ppos, page,
1514						length);
1515	free_page((unsigned long)page);
1516
1517	return length;
1518}
1519
1520static const struct file_operations sel_sidtab_hash_stats_ops = {
1521	.read		= sel_read_sidtab_hash_stats,
1522	.llseek		= generic_file_llseek,
1523};
1524
1525static const struct file_operations sel_avc_cache_threshold_ops = {
1526	.read		= sel_read_avc_cache_threshold,
1527	.write		= sel_write_avc_cache_threshold,
1528	.llseek		= generic_file_llseek,
1529};
1530
1531static const struct file_operations sel_avc_hash_stats_ops = {
1532	.read		= sel_read_avc_hash_stats,
1533	.llseek		= generic_file_llseek,
1534};
1535
1536#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1537static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1538{
1539	int cpu;
1540
1541	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1542		if (!cpu_possible(cpu))
1543			continue;
1544		*idx = cpu + 1;
1545		return &per_cpu(avc_cache_stats, cpu);
1546	}
1547	(*idx)++;
1548	return NULL;
1549}
1550
1551static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1552{
1553	loff_t n = *pos - 1;
1554
1555	if (*pos == 0)
1556		return SEQ_START_TOKEN;
1557
1558	return sel_avc_get_stat_idx(&n);
1559}
1560
1561static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1562{
1563	return sel_avc_get_stat_idx(pos);
1564}
1565
1566static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1567{
1568	struct avc_cache_stats *st = v;
1569
1570	if (v == SEQ_START_TOKEN) {
1571		seq_puts(seq,
1572			 "lookups hits misses allocations reclaims frees\n");
1573	} else {
1574		unsigned int lookups = st->lookups;
1575		unsigned int misses = st->misses;
1576		unsigned int hits = lookups - misses;
1577		seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1578			   hits, misses, st->allocations,
1579			   st->reclaims, st->frees);
1580	}
1581	return 0;
1582}
1583
1584static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1585{ }
1586
1587static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1588	.start		= sel_avc_stats_seq_start,
1589	.next		= sel_avc_stats_seq_next,
1590	.show		= sel_avc_stats_seq_show,
1591	.stop		= sel_avc_stats_seq_stop,
1592};
1593
1594static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1595{
1596	return seq_open(file, &sel_avc_cache_stats_seq_ops);
1597}
1598
1599static const struct file_operations sel_avc_cache_stats_ops = {
1600	.open		= sel_open_avc_cache_stats,
1601	.read		= seq_read,
1602	.llseek		= seq_lseek,
1603	.release	= seq_release,
1604};
1605#endif
1606
1607static int sel_make_avc_files(struct dentry *dir)
1608{
1609	struct super_block *sb = dir->d_sb;
1610	struct selinux_fs_info *fsi = sb->s_fs_info;
1611	int i;
1612	static const struct tree_descr files[] = {
1613		{ "cache_threshold",
1614		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1615		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1616#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1617		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1618#endif
1619	};
1620
1621	for (i = 0; i < ARRAY_SIZE(files); i++) {
1622		struct inode *inode;
1623		struct dentry *dentry;
1624
1625		dentry = d_alloc_name(dir, files[i].name);
1626		if (!dentry)
1627			return -ENOMEM;
1628
1629		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1630		if (!inode) {
1631			dput(dentry);
1632			return -ENOMEM;
1633		}
1634
1635		inode->i_fop = files[i].ops;
1636		inode->i_ino = ++fsi->last_ino;
1637		d_add(dentry, inode);
1638	}
1639
1640	return 0;
1641}
1642
1643static int sel_make_ss_files(struct dentry *dir)
1644{
1645	struct super_block *sb = dir->d_sb;
1646	struct selinux_fs_info *fsi = sb->s_fs_info;
1647	int i;
1648	static struct tree_descr files[] = {
1649		{ "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1650	};
1651
1652	for (i = 0; i < ARRAY_SIZE(files); i++) {
1653		struct inode *inode;
1654		struct dentry *dentry;
1655
1656		dentry = d_alloc_name(dir, files[i].name);
1657		if (!dentry)
1658			return -ENOMEM;
1659
1660		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1661		if (!inode) {
1662			dput(dentry);
1663			return -ENOMEM;
1664		}
1665
1666		inode->i_fop = files[i].ops;
1667		inode->i_ino = ++fsi->last_ino;
1668		d_add(dentry, inode);
1669	}
1670
1671	return 0;
1672}
1673
1674static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1675				size_t count, loff_t *ppos)
1676{
1677	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1678	char *con;
1679	u32 sid, len;
1680	ssize_t ret;
1681
1682	sid = file_inode(file)->i_ino&SEL_INO_MASK;
1683	ret = security_sid_to_context(fsi->state, sid, &con, &len);
1684	if (ret)
1685		return ret;
1686
1687	ret = simple_read_from_buffer(buf, count, ppos, con, len);
1688	kfree(con);
1689	return ret;
1690}
1691
1692static const struct file_operations sel_initcon_ops = {
1693	.read		= sel_read_initcon,
1694	.llseek		= generic_file_llseek,
1695};
1696
1697static int sel_make_initcon_files(struct dentry *dir)
1698{
1699	int i;
1700
1701	for (i = 1; i <= SECINITSID_NUM; i++) {
1702		struct inode *inode;
1703		struct dentry *dentry;
1704		const char *s = security_get_initial_sid_context(i);
1705
1706		if (!s)
1707			continue;
1708		dentry = d_alloc_name(dir, s);
1709		if (!dentry)
1710			return -ENOMEM;
1711
1712		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1713		if (!inode) {
1714			dput(dentry);
1715			return -ENOMEM;
1716		}
1717
1718		inode->i_fop = &sel_initcon_ops;
1719		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1720		d_add(dentry, inode);
1721	}
1722
1723	return 0;
1724}
1725
1726static inline unsigned long sel_class_to_ino(u16 class)
1727{
1728	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1729}
1730
1731static inline u16 sel_ino_to_class(unsigned long ino)
1732{
1733	return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1734}
1735
1736static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1737{
1738	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1739}
1740
1741static inline u32 sel_ino_to_perm(unsigned long ino)
1742{
1743	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1744}
1745
1746static ssize_t sel_read_class(struct file *file, char __user *buf,
1747				size_t count, loff_t *ppos)
1748{
1749	unsigned long ino = file_inode(file)->i_ino;
1750	char res[TMPBUFLEN];
1751	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1752	return simple_read_from_buffer(buf, count, ppos, res, len);
1753}
1754
1755static const struct file_operations sel_class_ops = {
1756	.read		= sel_read_class,
1757	.llseek		= generic_file_llseek,
1758};
1759
1760static ssize_t sel_read_perm(struct file *file, char __user *buf,
1761				size_t count, loff_t *ppos)
1762{
1763	unsigned long ino = file_inode(file)->i_ino;
1764	char res[TMPBUFLEN];
1765	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1766	return simple_read_from_buffer(buf, count, ppos, res, len);
1767}
1768
1769static const struct file_operations sel_perm_ops = {
1770	.read		= sel_read_perm,
1771	.llseek		= generic_file_llseek,
1772};
1773
1774static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1775				  size_t count, loff_t *ppos)
1776{
1777	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1778	int value;
1779	char tmpbuf[TMPBUFLEN];
1780	ssize_t length;
1781	unsigned long i_ino = file_inode(file)->i_ino;
1782
1783	value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1784	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1785
1786	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1787}
1788
1789static const struct file_operations sel_policycap_ops = {
1790	.read		= sel_read_policycap,
1791	.llseek		= generic_file_llseek,
1792};
1793
1794static int sel_make_perm_files(char *objclass, int classvalue,
1795				struct dentry *dir)
 
1796{
1797	struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1798	int i, rc, nperms;
1799	char **perms;
1800
1801	rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1802	if (rc)
1803		return rc;
1804
1805	for (i = 0; i < nperms; i++) {
1806		struct inode *inode;
1807		struct dentry *dentry;
1808
1809		rc = -ENOMEM;
1810		dentry = d_alloc_name(dir, perms[i]);
1811		if (!dentry)
1812			goto out;
1813
1814		rc = -ENOMEM;
1815		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1816		if (!inode) {
1817			dput(dentry);
1818			goto out;
1819		}
1820
1821		inode->i_fop = &sel_perm_ops;
1822		/* i+1 since perm values are 1-indexed */
1823		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1824		d_add(dentry, inode);
1825	}
1826	rc = 0;
1827out:
1828	for (i = 0; i < nperms; i++)
1829		kfree(perms[i]);
1830	kfree(perms);
1831	return rc;
1832}
1833
1834static int sel_make_class_dir_entries(char *classname, int index,
1835					struct dentry *dir)
 
1836{
1837	struct super_block *sb = dir->d_sb;
1838	struct selinux_fs_info *fsi = sb->s_fs_info;
1839	struct dentry *dentry = NULL;
1840	struct inode *inode = NULL;
1841	int rc;
1842
1843	dentry = d_alloc_name(dir, "index");
1844	if (!dentry)
1845		return -ENOMEM;
1846
1847	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1848	if (!inode) {
1849		dput(dentry);
1850		return -ENOMEM;
1851	}
1852
1853	inode->i_fop = &sel_class_ops;
1854	inode->i_ino = sel_class_to_ino(index);
1855	d_add(dentry, inode);
1856
1857	dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1858	if (IS_ERR(dentry))
1859		return PTR_ERR(dentry);
1860
1861	rc = sel_make_perm_files(classname, index, dentry);
1862
1863	return rc;
1864}
1865
1866static int sel_make_classes(struct selinux_fs_info *fsi)
 
 
1867{
1868
1869	int rc, nclasses, i;
1870	char **classes;
1871
1872	/* delete any existing entries */
1873	sel_remove_entries(fsi->class_dir);
1874
1875	rc = security_get_classes(fsi->state, &classes, &nclasses);
1876	if (rc)
1877		return rc;
1878
1879	/* +2 since classes are 1-indexed */
1880	fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1881
1882	for (i = 0; i < nclasses; i++) {
1883		struct dentry *class_name_dir;
1884
1885		class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1886					      &fsi->last_class_ino);
1887		if (IS_ERR(class_name_dir)) {
1888			rc = PTR_ERR(class_name_dir);
1889			goto out;
1890		}
1891
1892		/* i+1 since class values are 1-indexed */
1893		rc = sel_make_class_dir_entries(classes[i], i + 1,
1894				class_name_dir);
1895		if (rc)
1896			goto out;
1897	}
1898	rc = 0;
1899out:
1900	for (i = 0; i < nclasses; i++)
1901		kfree(classes[i]);
1902	kfree(classes);
1903	return rc;
1904}
1905
1906static int sel_make_policycap(struct selinux_fs_info *fsi)
1907{
1908	unsigned int iter;
1909	struct dentry *dentry = NULL;
1910	struct inode *inode = NULL;
1911
1912	sel_remove_entries(fsi->policycap_dir);
1913
1914	for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1915		if (iter < ARRAY_SIZE(selinux_policycap_names))
1916			dentry = d_alloc_name(fsi->policycap_dir,
1917					      selinux_policycap_names[iter]);
1918		else
1919			dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1920
1921		if (dentry == NULL)
1922			return -ENOMEM;
1923
1924		inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1925		if (inode == NULL) {
1926			dput(dentry);
1927			return -ENOMEM;
1928		}
1929
1930		inode->i_fop = &sel_policycap_ops;
1931		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1932		d_add(dentry, inode);
1933	}
1934
1935	return 0;
1936}
1937
1938static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1939			unsigned long *ino)
1940{
1941	struct dentry *dentry = d_alloc_name(dir, name);
1942	struct inode *inode;
1943
1944	if (!dentry)
1945		return ERR_PTR(-ENOMEM);
1946
1947	inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1948	if (!inode) {
1949		dput(dentry);
1950		return ERR_PTR(-ENOMEM);
1951	}
1952
1953	inode->i_op = &simple_dir_inode_operations;
1954	inode->i_fop = &simple_dir_operations;
1955	inode->i_ino = ++(*ino);
1956	/* directory inodes start off with i_nlink == 2 (for "." entry) */
1957	inc_nlink(inode);
1958	d_add(dentry, inode);
1959	/* bump link count on parent directory, too */
1960	inc_nlink(d_inode(dir));
1961
1962	return dentry;
1963}
1964
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1965#define NULL_FILE_NAME "null"
1966
1967static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1968{
1969	struct selinux_fs_info *fsi;
1970	int ret;
1971	struct dentry *dentry;
1972	struct inode *inode;
1973	struct inode_security_struct *isec;
1974
1975	static const struct tree_descr selinux_files[] = {
1976		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1977		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1978		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1979		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1980		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1981		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1982		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1983		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1984		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1985		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1986		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1987		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1988		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1989		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1990		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1991		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1992		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1993		[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1994					S_IWUGO},
1995		/* last one */ {""}
1996	};
1997
1998	ret = selinux_fs_info_create(sb);
1999	if (ret)
2000		goto err;
2001
2002	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2003	if (ret)
2004		goto err;
2005
2006	fsi = sb->s_fs_info;
2007	fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2008	if (IS_ERR(fsi->bool_dir)) {
2009		ret = PTR_ERR(fsi->bool_dir);
2010		fsi->bool_dir = NULL;
2011		goto err;
2012	}
2013
2014	ret = -ENOMEM;
2015	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2016	if (!dentry)
2017		goto err;
2018
2019	ret = -ENOMEM;
2020	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2021	if (!inode) {
2022		dput(dentry);
2023		goto err;
2024	}
2025
2026	inode->i_ino = ++fsi->last_ino;
2027	isec = selinux_inode(inode);
2028	isec->sid = SECINITSID_DEVNULL;
2029	isec->sclass = SECCLASS_CHR_FILE;
2030	isec->initialized = LABEL_INITIALIZED;
2031
2032	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2033	d_add(dentry, inode);
2034
2035	dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2036	if (IS_ERR(dentry)) {
2037		ret = PTR_ERR(dentry);
2038		goto err;
2039	}
2040
2041	ret = sel_make_avc_files(dentry);
 
 
2042
2043	dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2044	if (IS_ERR(dentry)) {
2045		ret = PTR_ERR(dentry);
2046		goto err;
2047	}
2048
2049	ret = sel_make_ss_files(dentry);
2050	if (ret)
2051		goto err;
2052
2053	dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2054	if (IS_ERR(dentry)) {
2055		ret = PTR_ERR(dentry);
2056		goto err;
2057	}
2058
2059	ret = sel_make_initcon_files(dentry);
2060	if (ret)
2061		goto err;
2062
2063	fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2064	if (IS_ERR(fsi->class_dir)) {
2065		ret = PTR_ERR(fsi->class_dir);
2066		fsi->class_dir = NULL;
2067		goto err;
2068	}
2069
2070	fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2071					  &fsi->last_ino);
2072	if (IS_ERR(fsi->policycap_dir)) {
2073		ret = PTR_ERR(fsi->policycap_dir);
2074		fsi->policycap_dir = NULL;
2075		goto err;
2076	}
2077
2078	ret = sel_make_policy_nodes(fsi);
2079	if (ret)
 
2080		goto err;
 
 
2081	return 0;
2082err:
2083	pr_err("SELinux: %s:  failed while creating inodes\n",
2084		__func__);
2085
2086	selinux_fs_info_free(sb);
2087
2088	return ret;
2089}
2090
2091static int sel_get_tree(struct fs_context *fc)
2092{
2093	return get_tree_single(fc, sel_fill_super);
2094}
2095
2096static const struct fs_context_operations sel_context_ops = {
2097	.get_tree	= sel_get_tree,
2098};
2099
2100static int sel_init_fs_context(struct fs_context *fc)
2101{
2102	fc->ops = &sel_context_ops;
2103	return 0;
2104}
2105
2106static void sel_kill_sb(struct super_block *sb)
2107{
2108	selinux_fs_info_free(sb);
2109	kill_litter_super(sb);
2110}
2111
2112static struct file_system_type sel_fs_type = {
2113	.name		= "selinuxfs",
2114	.init_fs_context = sel_init_fs_context,
2115	.kill_sb	= sel_kill_sb,
2116};
2117
2118struct vfsmount *selinuxfs_mount;
2119struct path selinux_null;
2120
2121static int __init init_sel_fs(void)
2122{
2123	struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2124					  sizeof(NULL_FILE_NAME)-1);
2125	int err;
2126
2127	if (!selinux_enabled_boot)
2128		return 0;
2129
2130	err = sysfs_create_mount_point(fs_kobj, "selinux");
2131	if (err)
2132		return err;
2133
2134	err = register_filesystem(&sel_fs_type);
2135	if (err) {
2136		sysfs_remove_mount_point(fs_kobj, "selinux");
2137		return err;
2138	}
2139
2140	selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2141	if (IS_ERR(selinuxfs_mount)) {
2142		pr_err("selinuxfs:  could not mount!\n");
2143		err = PTR_ERR(selinuxfs_mount);
2144		selinuxfs_mount = NULL;
 
2145	}
 
2146	selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2147						&null_name);
2148	if (IS_ERR(selinux_null.dentry)) {
2149		pr_err("selinuxfs:  could not lookup null!\n");
2150		err = PTR_ERR(selinux_null.dentry);
2151		selinux_null.dentry = NULL;
 
2152	}
2153
 
 
 
 
 
 
2154	return err;
2155}
2156
2157__initcall(init_sel_fs);
2158
2159#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2160void exit_sel_fs(void)
2161{
2162	sysfs_remove_mount_point(fs_kobj, "selinux");
2163	dput(selinux_null.dentry);
2164	kern_unmount(selinuxfs_mount);
2165	unregister_filesystem(&sel_fs_type);
2166}
2167#endif