1/* Updated: Karl MacMillan <kmacmillan@tresys.com>
   2 *
   3 *	Added conditional policy language extensions
   4 *
   5 *  Updated: Hewlett-Packard <paul@paul-moore.com>
   6 *
   7 *	Added support for the policy capability bitmap
   8 *
   9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  12 *	This program is free software; you can redistribute it and/or modify
  13 *	it under the terms of the GNU General Public License as published by
  14 *	the Free Software Foundation, version 2.
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/pagemap.h>
  19#include <linux/slab.h>
  20#include <linux/vmalloc.h>
  21#include <linux/fs.h>
  22#include <linux/mutex.h>
  23#include <linux/init.h>
  24#include <linux/string.h>
  25#include <linux/security.h>
  26#include <linux/major.h>
  27#include <linux/seq_file.h>
  28#include <linux/percpu.h>
  29#include <linux/audit.h>
  30#include <linux/uaccess.h>
  31#include <linux/kobject.h>
  32#include <linux/ctype.h>
  33
  34/* selinuxfs pseudo filesystem for exporting the security policy API.
  35   Based on the proc code and the fs/nfsd/nfsctl.c code. */
  36
  37#include "flask.h"
  38#include "avc.h"
  39#include "avc_ss.h"
  40#include "security.h"
  41#include "objsec.h"
  42#include "conditional.h"
  43
  44/* Policy capability filenames */
  45static char *policycap_names[] = {
  46	"network_peer_controls",
  47	"open_perms",
  48	"redhat1",
  49	"always_check_network"
  50};
  51
  52unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  53
  54static int __init checkreqprot_setup(char *str)
  55{
  56	unsigned long checkreqprot;
  57	if (!kstrtoul(str, 0, &checkreqprot))
  58		selinux_checkreqprot = checkreqprot ? 1 : 0;
  59	return 1;
  60}
  61__setup("checkreqprot=", checkreqprot_setup);
  62
  63static DEFINE_MUTEX(sel_mutex);
  64
  65/* global data for booleans */
  66static struct dentry *bool_dir;
  67static int bool_num;
  68static char **bool_pending_names;
  69static int *bool_pending_values;
  70
  71/* global data for classes */
  72static struct dentry *class_dir;
  73static unsigned long last_class_ino;
  74
  75static char policy_opened;
  76
  77/* global data for policy capabilities */
  78static struct dentry *policycap_dir;
  79
 
 
  80/* Check whether a task is allowed to use a security operation. */
  81static int task_has_security(struct task_struct *tsk,
  82			     u32 perms)
  83{
  84	const struct task_security_struct *tsec;
  85	u32 sid = 0;
  86
  87	rcu_read_lock();
  88	tsec = __task_cred(tsk)->security;
  89	if (tsec)
  90		sid = tsec->sid;
  91	rcu_read_unlock();
  92	if (!tsec)
  93		return -EACCES;
  94
  95	return avc_has_perm(sid, SECINITSID_SECURITY,
  96			    SECCLASS_SECURITY, perms, NULL);
  97}
  98
  99enum sel_inos {
 100	SEL_ROOT_INO = 2,
 101	SEL_LOAD,	/* load policy */
 102	SEL_ENFORCE,	/* get or set enforcing status */
 103	SEL_CONTEXT,	/* validate context */
 104	SEL_ACCESS,	/* compute access decision */
 105	SEL_CREATE,	/* compute create labeling decision */
 106	SEL_RELABEL,	/* compute relabeling decision */
 107	SEL_USER,	/* compute reachable user contexts */
 108	SEL_POLICYVERS,	/* return policy version for this kernel */
 109	SEL_COMMIT_BOOLS, /* commit new boolean values */
 110	SEL_MLS,	/* return if MLS policy is enabled */
 111	SEL_DISABLE,	/* disable SELinux until next reboot */
 112	SEL_MEMBER,	/* compute polyinstantiation membership decision */
 113	SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 114	SEL_COMPAT_NET,	/* whether to use old compat network packet controls */
 115	SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 116	SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 117	SEL_STATUS,	/* export current status using mmap() */
 118	SEL_POLICY,	/* allow userspace to read the in kernel policy */
 119	SEL_INO_NEXT,	/* The next inode number to use */
 120};
 121
 122static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 123
 124#define SEL_INITCON_INO_OFFSET		0x01000000
 125#define SEL_BOOL_INO_OFFSET		0x02000000
 126#define SEL_CLASS_INO_OFFSET		0x04000000
 127#define SEL_POLICYCAP_INO_OFFSET	0x08000000
 128#define SEL_INO_MASK			0x00ffffff
 129
 130#define TMPBUFLEN	12
 131static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 132				size_t count, loff_t *ppos)
 133{
 134	char tmpbuf[TMPBUFLEN];
 135	ssize_t length;
 136
 137	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 138	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 139}
 140
 141#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 142static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 143				 size_t count, loff_t *ppos)
 144
 145{
 146	char *page = NULL;
 147	ssize_t length;
 148	int new_value;
 149
 150	length = -ENOMEM;
 151	if (count >= PAGE_SIZE)
 152		goto out;
 153
 154	/* No partial writes. */
 155	length = EINVAL;
 156	if (*ppos != 0)
 157		goto out;
 158
 159	length = -ENOMEM;
 160	page = (char *)get_zeroed_page(GFP_KERNEL);
 161	if (!page)
 162		goto out;
 163
 164	length = -EFAULT;
 165	if (copy_from_user(page, buf, count))
 166		goto out;
 167
 168	length = -EINVAL;
 169	if (sscanf(page, "%d", &new_value) != 1)
 170		goto out;
 171
 172	if (new_value != selinux_enforcing) {
 173		length = task_has_security(current, SECURITY__SETENFORCE);
 174		if (length)
 175			goto out;
 176		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 177			"enforcing=%d old_enforcing=%d auid=%u ses=%u",
 178			new_value, selinux_enforcing,
 179			from_kuid(&init_user_ns, audit_get_loginuid(current)),
 180			audit_get_sessionid(current));
 181		selinux_enforcing = new_value;
 182		if (selinux_enforcing)
 183			avc_ss_reset(0);
 184		selnl_notify_setenforce(selinux_enforcing);
 185		selinux_status_update_setenforce(selinux_enforcing);
 186	}
 187	length = count;
 188out:
 189	free_page((unsigned long) page);
 190	return length;
 191}
 192#else
 193#define sel_write_enforce NULL
 194#endif
 195
 196static const struct file_operations sel_enforce_ops = {
 197	.read		= sel_read_enforce,
 198	.write		= sel_write_enforce,
 199	.llseek		= generic_file_llseek,
 200};
 201
 202static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 203					size_t count, loff_t *ppos)
 204{
 205	char tmpbuf[TMPBUFLEN];
 206	ssize_t length;
 207	ino_t ino = file_inode(filp)->i_ino;
 208	int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 209		security_get_reject_unknown() : !security_get_allow_unknown();
 210
 211	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 212	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 213}
 214
 215static const struct file_operations sel_handle_unknown_ops = {
 216	.read		= sel_read_handle_unknown,
 217	.llseek		= generic_file_llseek,
 218};
 219
 220static int sel_open_handle_status(struct inode *inode, struct file *filp)
 221{
 222	struct page    *status = selinux_kernel_status_page();
 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	char *page = NULL;
 279	ssize_t length;
 280	int new_value;
 
 281
 282	length = -ENOMEM;
 283	if (count >= PAGE_SIZE)
 284		goto out;
 285
 286	/* No partial writes. */
 287	length = -EINVAL;
 288	if (*ppos != 0)
 289		goto out;
 290
 291	length = -ENOMEM;
 292	page = (char *)get_zeroed_page(GFP_KERNEL);
 293	if (!page)
 294		goto out;
 295
 296	length = -EFAULT;
 297	if (copy_from_user(page, buf, count))
 298		goto out;
 299
 300	length = -EINVAL;
 301	if (sscanf(page, "%d", &new_value) != 1)
 302		goto out;
 303
 304	if (new_value) {
 305		length = selinux_disable();
 306		if (length)
 307			goto out;
 308		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 309			"selinux=0 auid=%u ses=%u",
 310			from_kuid(&init_user_ns, audit_get_loginuid(current)),
 311			audit_get_sessionid(current));
 312	}
 313
 314	length = count;
 315out:
 316	free_page((unsigned long) page);
 317	return length;
 318}
 319#else
 320#define sel_write_disable NULL
 321#endif
 322
 323static const struct file_operations sel_disable_ops = {
 324	.write		= sel_write_disable,
 325	.llseek		= generic_file_llseek,
 326};
 327
 328static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 329				   size_t count, loff_t *ppos)
 330{
 331	char tmpbuf[TMPBUFLEN];
 332	ssize_t length;
 333
 334	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 335	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 336}
 337
 338static const struct file_operations sel_policyvers_ops = {
 339	.read		= sel_read_policyvers,
 340	.llseek		= generic_file_llseek,
 341};
 342
 343/* declaration for sel_write_load */
 344static int sel_make_bools(void);
 345static int sel_make_classes(void);
 346static int sel_make_policycap(void);
 347
 348/* declaration for sel_make_class_dirs */
 349static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 350			unsigned long *ino);
 351
 352static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 353				size_t count, loff_t *ppos)
 354{
 355	char tmpbuf[TMPBUFLEN];
 356	ssize_t length;
 357
 358	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 359			   security_mls_enabled());
 360	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 361}
 362
 363static const struct file_operations sel_mls_ops = {
 364	.read		= sel_read_mls,
 365	.llseek		= generic_file_llseek,
 366};
 367
 368struct policy_load_memory {
 369	size_t len;
 370	void *data;
 371};
 372
 373static int sel_open_policy(struct inode *inode, struct file *filp)
 374{
 375	struct policy_load_memory *plm = NULL;
 376	int rc;
 377
 378	BUG_ON(filp->private_data);
 379
 380	mutex_lock(&sel_mutex);
 381
 382	rc = task_has_security(current, SECURITY__READ_POLICY);
 383	if (rc)
 384		goto err;
 385
 386	rc = -EBUSY;
 387	if (policy_opened)
 388		goto err;
 389
 390	rc = -ENOMEM;
 391	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 392	if (!plm)
 393		goto err;
 394
 395	if (i_size_read(inode) != security_policydb_len()) {
 396		mutex_lock(&inode->i_mutex);
 397		i_size_write(inode, security_policydb_len());
 398		mutex_unlock(&inode->i_mutex);
 399	}
 400
 401	rc = security_read_policy(&plm->data, &plm->len);
 402	if (rc)
 403		goto err;
 404
 405	policy_opened = 1;
 406
 407	filp->private_data = plm;
 408
 409	mutex_unlock(&sel_mutex);
 410
 411	return 0;
 412err:
 413	mutex_unlock(&sel_mutex);
 414
 415	if (plm)
 416		vfree(plm->data);
 417	kfree(plm);
 418	return rc;
 419}
 420
 421static int sel_release_policy(struct inode *inode, struct file *filp)
 422{
 423	struct policy_load_memory *plm = filp->private_data;
 424
 425	BUG_ON(!plm);
 426
 427	policy_opened = 0;
 428
 429	vfree(plm->data);
 430	kfree(plm);
 431
 432	return 0;
 433}
 434
 435static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 436			       size_t count, loff_t *ppos)
 437{
 438	struct policy_load_memory *plm = filp->private_data;
 439	int ret;
 440
 441	mutex_lock(&sel_mutex);
 442
 443	ret = task_has_security(current, SECURITY__READ_POLICY);
 444	if (ret)
 445		goto out;
 446
 447	ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 448out:
 449	mutex_unlock(&sel_mutex);
 450	return ret;
 451}
 452
 453static int sel_mmap_policy_fault(struct vm_area_struct *vma,
 454				 struct vm_fault *vmf)
 455{
 456	struct policy_load_memory *plm = vma->vm_file->private_data;
 457	unsigned long offset;
 458	struct page *page;
 459
 460	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 461		return VM_FAULT_SIGBUS;
 462
 463	offset = vmf->pgoff << PAGE_SHIFT;
 464	if (offset >= roundup(plm->len, PAGE_SIZE))
 465		return VM_FAULT_SIGBUS;
 466
 467	page = vmalloc_to_page(plm->data + offset);
 468	get_page(page);
 469
 470	vmf->page = page;
 471
 472	return 0;
 473}
 474
 475static struct vm_operations_struct sel_mmap_policy_ops = {
 476	.fault = sel_mmap_policy_fault,
 477	.page_mkwrite = sel_mmap_policy_fault,
 478};
 479
 480static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 481{
 482	if (vma->vm_flags & VM_SHARED) {
 483		/* do not allow mprotect to make mapping writable */
 484		vma->vm_flags &= ~VM_MAYWRITE;
 485
 486		if (vma->vm_flags & VM_WRITE)
 487			return -EACCES;
 488	}
 489
 490	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 491	vma->vm_ops = &sel_mmap_policy_ops;
 492
 493	return 0;
 494}
 495
 496static const struct file_operations sel_policy_ops = {
 497	.open		= sel_open_policy,
 498	.read		= sel_read_policy,
 499	.mmap		= sel_mmap_policy,
 500	.release	= sel_release_policy,
 501	.llseek		= generic_file_llseek,
 502};
 503
 504static ssize_t sel_write_load(struct file *file, const char __user *buf,
 505			      size_t count, loff_t *ppos)
 506
 507{
 508	ssize_t length;
 509	void *data = NULL;
 510
 511	mutex_lock(&sel_mutex);
 512
 513	length = task_has_security(current, SECURITY__LOAD_POLICY);
 514	if (length)
 515		goto out;
 516
 517	/* No partial writes. */
 518	length = -EINVAL;
 519	if (*ppos != 0)
 520		goto out;
 521
 522	length = -EFBIG;
 523	if (count > 64 * 1024 * 1024)
 524		goto out;
 525
 526	length = -ENOMEM;
 527	data = vmalloc(count);
 528	if (!data)
 529		goto out;
 530
 531	length = -EFAULT;
 532	if (copy_from_user(data, buf, count) != 0)
 533		goto out;
 534
 535	length = security_load_policy(data, count);
 536	if (length)
 537		goto out;
 538
 539	length = sel_make_bools();
 540	if (length)
 541		goto out1;
 542
 543	length = sel_make_classes();
 544	if (length)
 545		goto out1;
 546
 547	length = sel_make_policycap();
 548	if (length)
 549		goto out1;
 550
 551	length = count;
 552
 553out1:
 554	audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 555		"policy loaded auid=%u ses=%u",
 556		from_kuid(&init_user_ns, audit_get_loginuid(current)),
 557		audit_get_sessionid(current));
 558out:
 559	mutex_unlock(&sel_mutex);
 560	vfree(data);
 561	return length;
 562}
 563
 564static const struct file_operations sel_load_ops = {
 565	.write		= sel_write_load,
 566	.llseek		= generic_file_llseek,
 567};
 568
 569static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 570{
 571	char *canon = NULL;
 572	u32 sid, len;
 573	ssize_t length;
 574
 575	length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 576	if (length)
 577		goto out;
 578
 579	length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
 580	if (length)
 581		goto out;
 582
 583	length = security_sid_to_context(sid, &canon, &len);
 584	if (length)
 585		goto out;
 586
 587	length = -ERANGE;
 588	if (len > SIMPLE_TRANSACTION_LIMIT) {
 589		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 590			"payload max\n", __func__, len);
 591		goto out;
 592	}
 593
 594	memcpy(buf, canon, len);
 595	length = len;
 596out:
 597	kfree(canon);
 598	return length;
 599}
 600
 601static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 602				     size_t count, loff_t *ppos)
 603{
 604	char tmpbuf[TMPBUFLEN];
 605	ssize_t length;
 606
 607	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 608	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 609}
 610
 611static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 612				      size_t count, loff_t *ppos)
 613{
 614	char *page = NULL;
 615	ssize_t length;
 616	unsigned int new_value;
 617
 618	length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 619	if (length)
 620		goto out;
 621
 622	length = -ENOMEM;
 623	if (count >= PAGE_SIZE)
 624		goto out;
 625
 626	/* No partial writes. */
 627	length = -EINVAL;
 628	if (*ppos != 0)
 629		goto out;
 630
 631	length = -ENOMEM;
 632	page = (char *)get_zeroed_page(GFP_KERNEL);
 633	if (!page)
 634		goto out;
 635
 636	length = -EFAULT;
 637	if (copy_from_user(page, buf, count))
 638		goto out;
 639
 640	length = -EINVAL;
 641	if (sscanf(page, "%u", &new_value) != 1)
 642		goto out;
 643
 644	selinux_checkreqprot = new_value ? 1 : 0;
 645	length = count;
 646out:
 647	free_page((unsigned long) page);
 648	return length;
 649}
 650static const struct file_operations sel_checkreqprot_ops = {
 651	.read		= sel_read_checkreqprot,
 652	.write		= sel_write_checkreqprot,
 653	.llseek		= generic_file_llseek,
 654};
 655
 656/*
 657 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 658 */
 659static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 660static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 661static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 662static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 663static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 664
 665static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 666	[SEL_ACCESS] = sel_write_access,
 667	[SEL_CREATE] = sel_write_create,
 668	[SEL_RELABEL] = sel_write_relabel,
 669	[SEL_USER] = sel_write_user,
 670	[SEL_MEMBER] = sel_write_member,
 671	[SEL_CONTEXT] = sel_write_context,
 672};
 673
 674static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 675{
 676	ino_t ino = file_inode(file)->i_ino;
 677	char *data;
 678	ssize_t rv;
 679
 680	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 681		return -EINVAL;
 682
 683	data = simple_transaction_get(file, buf, size);
 684	if (IS_ERR(data))
 685		return PTR_ERR(data);
 686
 687	rv = write_op[ino](file, data, size);
 688	if (rv > 0) {
 689		simple_transaction_set(file, rv);
 690		rv = size;
 691	}
 692	return rv;
 693}
 694
 695static const struct file_operations transaction_ops = {
 696	.write		= selinux_transaction_write,
 697	.read		= simple_transaction_read,
 698	.release	= simple_transaction_release,
 699	.llseek		= generic_file_llseek,
 700};
 701
 702/*
 703 * payload - write methods
 704 * If the method has a response, the response should be put in buf,
 705 * and the length returned.  Otherwise return 0 or and -error.
 706 */
 707
 708static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 709{
 710	char *scon = NULL, *tcon = NULL;
 711	u32 ssid, tsid;
 712	u16 tclass;
 713	struct av_decision avd;
 714	ssize_t length;
 715
 716	length = task_has_security(current, SECURITY__COMPUTE_AV);
 717	if (length)
 718		goto out;
 719
 720	length = -ENOMEM;
 721	scon = kzalloc(size + 1, GFP_KERNEL);
 722	if (!scon)
 723		goto out;
 724
 725	length = -ENOMEM;
 726	tcon = kzalloc(size + 1, GFP_KERNEL);
 727	if (!tcon)
 728		goto out;
 729
 730	length = -EINVAL;
 731	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 732		goto out;
 733
 734	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
 735					 GFP_KERNEL);
 736	if (length)
 737		goto out;
 738
 739	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
 740					 GFP_KERNEL);
 741	if (length)
 742		goto out;
 743
 744	security_compute_av_user(ssid, tsid, tclass, &avd);
 745
 746	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 747			  "%x %x %x %x %u %x",
 748			  avd.allowed, 0xffffffff,
 749			  avd.auditallow, avd.auditdeny,
 750			  avd.seqno, avd.flags);
 751out:
 752	kfree(tcon);
 753	kfree(scon);
 754	return length;
 755}
 756
 
 
 
 
 
 
 
 
 757static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 758{
 759	char *scon = NULL, *tcon = NULL;
 760	char *namebuf = NULL, *objname = NULL;
 761	u32 ssid, tsid, newsid;
 762	u16 tclass;
 763	ssize_t length;
 764	char *newcon = NULL;
 765	u32 len;
 766	int nargs;
 767
 768	length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 769	if (length)
 770		goto out;
 771
 772	length = -ENOMEM;
 773	scon = kzalloc(size + 1, GFP_KERNEL);
 774	if (!scon)
 775		goto out;
 776
 777	length = -ENOMEM;
 778	tcon = kzalloc(size + 1, GFP_KERNEL);
 779	if (!tcon)
 780		goto out;
 781
 782	length = -ENOMEM;
 783	namebuf = kzalloc(size + 1, GFP_KERNEL);
 784	if (!namebuf)
 785		goto out;
 786
 787	length = -EINVAL;
 788	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
 789	if (nargs < 3 || nargs > 4)
 790		goto out;
 791	if (nargs == 4) {
 792		/*
 793		 * If and when the name of new object to be queried contains
 794		 * either whitespace or multibyte characters, they shall be
 795		 * encoded based on the percentage-encoding rule.
 796		 * If not encoded, the sscanf logic picks up only left-half
 797		 * of the supplied name; splitted by a whitespace unexpectedly.
 798		 */
 799		char   *r, *w;
 800		int     c1, c2;
 801
 802		r = w = namebuf;
 803		do {
 804			c1 = *r++;
 805			if (c1 == '+')
 806				c1 = ' ';
 807			else if (c1 == '%') {
 808				c1 = hex_to_bin(*r++);
 809				if (c1 < 0)
 810					goto out;
 811				c2 = hex_to_bin(*r++);
 812				if (c2 < 0)
 813					goto out;
 814				c1 = (c1 << 4) | c2;
 815			}
 816			*w++ = c1;
 817		} while (c1 != '\0');
 818
 819		objname = namebuf;
 820	}
 821
 822	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
 823					 GFP_KERNEL);
 824	if (length)
 825		goto out;
 826
 827	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
 828					 GFP_KERNEL);
 829	if (length)
 830		goto out;
 831
 832	length = security_transition_sid_user(ssid, tsid, tclass,
 833					      objname, &newsid);
 834	if (length)
 835		goto out;
 836
 837	length = security_sid_to_context(newsid, &newcon, &len);
 838	if (length)
 839		goto out;
 840
 841	length = -ERANGE;
 842	if (len > SIMPLE_TRANSACTION_LIMIT) {
 843		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 844			"payload max\n", __func__, len);
 845		goto out;
 846	}
 847
 848	memcpy(buf, newcon, len);
 849	length = len;
 850out:
 851	kfree(newcon);
 852	kfree(namebuf);
 853	kfree(tcon);
 854	kfree(scon);
 855	return length;
 856}
 857
 858static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 859{
 860	char *scon = NULL, *tcon = NULL;
 861	u32 ssid, tsid, newsid;
 862	u16 tclass;
 863	ssize_t length;
 864	char *newcon = NULL;
 865	u32 len;
 866
 867	length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 868	if (length)
 869		goto out;
 870
 871	length = -ENOMEM;
 872	scon = kzalloc(size + 1, GFP_KERNEL);
 873	if (!scon)
 874		goto out;
 875
 876	length = -ENOMEM;
 877	tcon = kzalloc(size + 1, GFP_KERNEL);
 878	if (!tcon)
 879		goto out;
 880
 881	length = -EINVAL;
 882	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 883		goto out;
 884
 885	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
 886					 GFP_KERNEL);
 887	if (length)
 888		goto out;
 889
 890	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
 891					 GFP_KERNEL);
 892	if (length)
 893		goto out;
 894
 895	length = security_change_sid(ssid, tsid, tclass, &newsid);
 896	if (length)
 897		goto out;
 898
 899	length = security_sid_to_context(newsid, &newcon, &len);
 900	if (length)
 901		goto out;
 902
 903	length = -ERANGE;
 904	if (len > SIMPLE_TRANSACTION_LIMIT)
 905		goto out;
 906
 907	memcpy(buf, newcon, len);
 908	length = len;
 909out:
 910	kfree(newcon);
 911	kfree(tcon);
 912	kfree(scon);
 913	return length;
 914}
 915
 916static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
 917{
 918	char *con = NULL, *user = NULL, *ptr;
 919	u32 sid, *sids = NULL;
 920	ssize_t length;
 921	char *newcon;
 922	int i, rc;
 923	u32 len, nsids;
 924
 925	length = task_has_security(current, SECURITY__COMPUTE_USER);
 926	if (length)
 927		goto out;
 928
 929	length = -ENOMEM;
 930	con = kzalloc(size + 1, GFP_KERNEL);
 931	if (!con)
 932		goto out;
 933
 934	length = -ENOMEM;
 935	user = kzalloc(size + 1, GFP_KERNEL);
 936	if (!user)
 937		goto out;
 938
 939	length = -EINVAL;
 940	if (sscanf(buf, "%s %s", con, user) != 2)
 941		goto out;
 942
 943	length = security_context_to_sid(con, strlen(con) + 1, &sid, GFP_KERNEL);
 944	if (length)
 945		goto out;
 946
 947	length = security_get_user_sids(sid, user, &sids, &nsids);
 948	if (length)
 949		goto out;
 950
 951	length = sprintf(buf, "%u", nsids) + 1;
 952	ptr = buf + length;
 953	for (i = 0; i < nsids; i++) {
 954		rc = security_sid_to_context(sids[i], &newcon, &len);
 955		if (rc) {
 956			length = rc;
 957			goto out;
 958		}
 959		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 960			kfree(newcon);
 961			length = -ERANGE;
 962			goto out;
 963		}
 964		memcpy(ptr, newcon, len);
 965		kfree(newcon);
 966		ptr += len;
 967		length += len;
 968	}
 969out:
 970	kfree(sids);
 971	kfree(user);
 972	kfree(con);
 973	return length;
 974}
 975
 976static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
 977{
 978	char *scon = NULL, *tcon = NULL;
 979	u32 ssid, tsid, newsid;
 980	u16 tclass;
 981	ssize_t length;
 982	char *newcon = NULL;
 983	u32 len;
 984
 985	length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 986	if (length)
 987		goto out;
 988
 989	length = -ENOMEM;
 990	scon = kzalloc(size + 1, GFP_KERNEL);
 991	if (!scon)
 992		goto out;
 993
 994	length = -ENOMEM;
 995	tcon = kzalloc(size + 1, GFP_KERNEL);
 996	if (!tcon)
 997		goto out;
 998
 999	length = -EINVAL;
1000	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1001		goto out;
1002
1003	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
1004					 GFP_KERNEL);
1005	if (length)
1006		goto out;
1007
1008	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
1009					 GFP_KERNEL);
1010	if (length)
1011		goto out;
1012
1013	length = security_member_sid(ssid, tsid, tclass, &newsid);
1014	if (length)
1015		goto out;
1016
1017	length = security_sid_to_context(newsid, &newcon, &len);
1018	if (length)
1019		goto out;
1020
1021	length = -ERANGE;
1022	if (len > SIMPLE_TRANSACTION_LIMIT) {
1023		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
1024			"payload max\n", __func__, len);
1025		goto out;
1026	}
1027
1028	memcpy(buf, newcon, len);
1029	length = len;
1030out:
1031	kfree(newcon);
1032	kfree(tcon);
1033	kfree(scon);
1034	return length;
1035}
1036
1037static struct inode *sel_make_inode(struct super_block *sb, int mode)
1038{
1039	struct inode *ret = new_inode(sb);
1040
1041	if (ret) {
1042		ret->i_mode = mode;
1043		ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1044	}
1045	return ret;
1046}
1047
1048static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1049			     size_t count, loff_t *ppos)
1050{
1051	char *page = NULL;
1052	ssize_t length;
1053	ssize_t ret;
1054	int cur_enforcing;
1055	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
 
1056	const char *name = filep->f_path.dentry->d_name.name;
1057
1058	mutex_lock(&sel_mutex);
1059
1060	ret = -EINVAL;
1061	if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1062		goto out;
1063
1064	ret = -ENOMEM;
1065	page = (char *)get_zeroed_page(GFP_KERNEL);
1066	if (!page)
1067		goto out;
1068
1069	cur_enforcing = security_get_bool_value(index);
1070	if (cur_enforcing < 0) {
1071		ret = cur_enforcing;
1072		goto out;
1073	}
1074	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1075			  bool_pending_values[index]);
1076	ret = simple_read_from_buffer(buf, count, ppos, page, length);
1077out:
1078	mutex_unlock(&sel_mutex);
1079	free_page((unsigned long)page);
1080	return ret;
1081}
1082
1083static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1084			      size_t count, loff_t *ppos)
1085{
1086	char *page = NULL;
1087	ssize_t length;
1088	int new_value;
1089	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
 
1090	const char *name = filep->f_path.dentry->d_name.name;
1091
1092	mutex_lock(&sel_mutex);
1093
1094	length = task_has_security(current, SECURITY__SETBOOL);
1095	if (length)
1096		goto out;
1097
1098	length = -EINVAL;
1099	if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1100		goto out;
1101
1102	length = -ENOMEM;
1103	if (count >= PAGE_SIZE)
1104		goto out;
1105
1106	/* No partial writes. */
1107	length = -EINVAL;
1108	if (*ppos != 0)
1109		goto out;
1110
1111	length = -ENOMEM;
1112	page = (char *)get_zeroed_page(GFP_KERNEL);
1113	if (!page)
1114		goto out;
1115
1116	length = -EFAULT;
1117	if (copy_from_user(page, buf, count))
1118		goto out;
1119
1120	length = -EINVAL;
1121	if (sscanf(page, "%d", &new_value) != 1)
1122		goto out;
1123
1124	if (new_value)
1125		new_value = 1;
1126
1127	bool_pending_values[index] = new_value;
1128	length = count;
1129
1130out:
1131	mutex_unlock(&sel_mutex);
1132	free_page((unsigned long) page);
1133	return length;
1134}
1135
1136static const struct file_operations sel_bool_ops = {
1137	.read		= sel_read_bool,
1138	.write		= sel_write_bool,
1139	.llseek		= generic_file_llseek,
1140};
1141
1142static ssize_t sel_commit_bools_write(struct file *filep,
1143				      const char __user *buf,
1144				      size_t count, loff_t *ppos)
1145{
1146	char *page = NULL;
1147	ssize_t length;
1148	int new_value;
1149
1150	mutex_lock(&sel_mutex);
1151
1152	length = task_has_security(current, SECURITY__SETBOOL);
1153	if (length)
1154		goto out;
1155
1156	length = -ENOMEM;
1157	if (count >= PAGE_SIZE)
1158		goto out;
1159
1160	/* No partial writes. */
1161	length = -EINVAL;
1162	if (*ppos != 0)
1163		goto out;
1164
1165	length = -ENOMEM;
1166	page = (char *)get_zeroed_page(GFP_KERNEL);
1167	if (!page)
1168		goto out;
1169
1170	length = -EFAULT;
1171	if (copy_from_user(page, buf, count))
1172		goto out;
1173
1174	length = -EINVAL;
1175	if (sscanf(page, "%d", &new_value) != 1)
1176		goto out;
1177
1178	length = 0;
1179	if (new_value && bool_pending_values)
1180		length = security_set_bools(bool_num, bool_pending_values);
1181
1182	if (!length)
1183		length = count;
1184
1185out:
1186	mutex_unlock(&sel_mutex);
1187	free_page((unsigned long) page);
1188	return length;
1189}
1190
1191static const struct file_operations sel_commit_bools_ops = {
1192	.write		= sel_commit_bools_write,
1193	.llseek		= generic_file_llseek,
1194};
1195
1196static void sel_remove_entries(struct dentry *de)
1197{
1198	struct list_head *node;
1199
1200	spin_lock(&de->d_lock);
1201	node = de->d_subdirs.next;
1202	while (node != &de->d_subdirs) {
1203		struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1204
1205		spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1206		list_del_init(node);
1207
1208		if (d->d_inode) {
1209			dget_dlock(d);
1210			spin_unlock(&de->d_lock);
1211			spin_unlock(&d->d_lock);
1212			d_delete(d);
1213			simple_unlink(de->d_inode, d);
1214			dput(d);
1215			spin_lock(&de->d_lock);
1216		} else
1217			spin_unlock(&d->d_lock);
1218		node = de->d_subdirs.next;
1219	}
1220
1221	spin_unlock(&de->d_lock);
1222}
1223
1224#define BOOL_DIR_NAME "booleans"
1225
1226static int sel_make_bools(void)
1227{
1228	int i, ret;
1229	ssize_t len;
1230	struct dentry *dentry = NULL;
1231	struct dentry *dir = bool_dir;
1232	struct inode *inode = NULL;
1233	struct inode_security_struct *isec;
1234	char **names = NULL, *page;
1235	int num;
1236	int *values = NULL;
1237	u32 sid;
1238
1239	/* remove any existing files */
1240	for (i = 0; i < bool_num; i++)
1241		kfree(bool_pending_names[i]);
1242	kfree(bool_pending_names);
1243	kfree(bool_pending_values);
1244	bool_num = 0;
1245	bool_pending_names = NULL;
1246	bool_pending_values = NULL;
1247
1248	sel_remove_entries(dir);
1249
1250	ret = -ENOMEM;
1251	page = (char *)get_zeroed_page(GFP_KERNEL);
1252	if (!page)
1253		goto out;
1254
1255	ret = security_get_bools(&num, &names, &values);
1256	if (ret)
1257		goto out;
1258
1259	for (i = 0; i < num; i++) {
1260		ret = -ENOMEM;
1261		dentry = d_alloc_name(dir, names[i]);
1262		if (!dentry)
1263			goto out;
1264
1265		ret = -ENOMEM;
1266		inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1267		if (!inode)
1268			goto out;
1269
1270		ret = -ENAMETOOLONG;
1271		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
 
 
 
 
1272		if (len >= PAGE_SIZE)
1273			goto out;
1274
1275		isec = (struct inode_security_struct *)inode->i_security;
1276		ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1277		if (ret)
1278			goto out;
1279
1280		isec->sid = sid;
1281		isec->initialized = 1;
1282		inode->i_fop = &sel_bool_ops;
1283		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1284		d_add(dentry, inode);
1285	}
1286	bool_num = num;
1287	bool_pending_names = names;
1288	bool_pending_values = values;
1289
1290	free_page((unsigned long)page);
1291	return 0;
1292out:
1293	free_page((unsigned long)page);
1294
1295	if (names) {
1296		for (i = 0; i < num; i++)
1297			kfree(names[i]);
1298		kfree(names);
1299	}
1300	kfree(values);
1301	sel_remove_entries(dir);
1302
1303	return ret;
1304}
1305
1306#define NULL_FILE_NAME "null"
1307
1308struct path selinux_null;
1309
1310static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1311					    size_t count, loff_t *ppos)
1312{
1313	char tmpbuf[TMPBUFLEN];
1314	ssize_t length;
1315
1316	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1317	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1318}
1319
1320static ssize_t sel_write_avc_cache_threshold(struct file *file,
1321					     const char __user *buf,
1322					     size_t count, loff_t *ppos)
1323
1324{
1325	char *page = NULL;
1326	ssize_t ret;
1327	int new_value;
1328
1329	ret = task_has_security(current, SECURITY__SETSECPARAM);
1330	if (ret)
1331		goto out;
1332
1333	ret = -ENOMEM;
1334	if (count >= PAGE_SIZE)
1335		goto out;
1336
1337	/* No partial writes. */
1338	ret = -EINVAL;
1339	if (*ppos != 0)
1340		goto out;
1341
1342	ret = -ENOMEM;
1343	page = (char *)get_zeroed_page(GFP_KERNEL);
1344	if (!page)
1345		goto out;
1346
1347	ret = -EFAULT;
1348	if (copy_from_user(page, buf, count))
1349		goto out;
1350
1351	ret = -EINVAL;
1352	if (sscanf(page, "%u", &new_value) != 1)
1353		goto out;
1354
1355	avc_cache_threshold = new_value;
1356
1357	ret = count;
1358out:
1359	free_page((unsigned long)page);
1360	return ret;
1361}
1362
1363static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1364				       size_t count, loff_t *ppos)
1365{
1366	char *page;
1367	ssize_t length;
1368
1369	page = (char *)__get_free_page(GFP_KERNEL);
1370	if (!page)
1371		return -ENOMEM;
1372
1373	length = avc_get_hash_stats(page);
1374	if (length >= 0)
1375		length = simple_read_from_buffer(buf, count, ppos, page, length);
1376	free_page((unsigned long)page);
1377
1378	return length;
1379}
1380
1381static const struct file_operations sel_avc_cache_threshold_ops = {
1382	.read		= sel_read_avc_cache_threshold,
1383	.write		= sel_write_avc_cache_threshold,
1384	.llseek		= generic_file_llseek,
1385};
1386
1387static const struct file_operations sel_avc_hash_stats_ops = {
1388	.read		= sel_read_avc_hash_stats,
1389	.llseek		= generic_file_llseek,
1390};
1391
1392#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1393static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1394{
1395	int cpu;
1396
1397	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1398		if (!cpu_possible(cpu))
1399			continue;
1400		*idx = cpu + 1;
1401		return &per_cpu(avc_cache_stats, cpu);
1402	}
1403	return NULL;
1404}
1405
1406static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1407{
1408	loff_t n = *pos - 1;
1409
1410	if (*pos == 0)
1411		return SEQ_START_TOKEN;
1412
1413	return sel_avc_get_stat_idx(&n);
1414}
1415
1416static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1417{
1418	return sel_avc_get_stat_idx(pos);
1419}
1420
1421static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1422{
1423	struct avc_cache_stats *st = v;
1424
1425	if (v == SEQ_START_TOKEN)
1426		seq_printf(seq, "lookups hits misses allocations reclaims "
1427			   "frees\n");
1428	else {
1429		unsigned int lookups = st->lookups;
1430		unsigned int misses = st->misses;
1431		unsigned int hits = lookups - misses;
1432		seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1433			   hits, misses, st->allocations,
1434			   st->reclaims, st->frees);
1435	}
1436	return 0;
1437}
1438
1439static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1440{ }
1441
1442static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1443	.start		= sel_avc_stats_seq_start,
1444	.next		= sel_avc_stats_seq_next,
1445	.show		= sel_avc_stats_seq_show,
1446	.stop		= sel_avc_stats_seq_stop,
1447};
1448
1449static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1450{
1451	return seq_open(file, &sel_avc_cache_stats_seq_ops);
1452}
1453
1454static const struct file_operations sel_avc_cache_stats_ops = {
1455	.open		= sel_open_avc_cache_stats,
1456	.read		= seq_read,
1457	.llseek		= seq_lseek,
1458	.release	= seq_release,
1459};
1460#endif
1461
1462static int sel_make_avc_files(struct dentry *dir)
1463{
1464	int i;
1465	static struct tree_descr files[] = {
1466		{ "cache_threshold",
1467		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1468		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1469#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1470		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1471#endif
1472	};
1473
1474	for (i = 0; i < ARRAY_SIZE(files); i++) {
1475		struct inode *inode;
1476		struct dentry *dentry;
1477
1478		dentry = d_alloc_name(dir, files[i].name);
1479		if (!dentry)
1480			return -ENOMEM;
1481
1482		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1483		if (!inode)
1484			return -ENOMEM;
1485
1486		inode->i_fop = files[i].ops;
1487		inode->i_ino = ++sel_last_ino;
1488		d_add(dentry, inode);
1489	}
1490
1491	return 0;
1492}
1493
1494static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1495				size_t count, loff_t *ppos)
1496{
 
1497	char *con;
1498	u32 sid, len;
1499	ssize_t ret;
1500
1501	sid = file_inode(file)->i_ino&SEL_INO_MASK;
 
1502	ret = security_sid_to_context(sid, &con, &len);
1503	if (ret)
1504		return ret;
1505
1506	ret = simple_read_from_buffer(buf, count, ppos, con, len);
1507	kfree(con);
1508	return ret;
1509}
1510
1511static const struct file_operations sel_initcon_ops = {
1512	.read		= sel_read_initcon,
1513	.llseek		= generic_file_llseek,
1514};
1515
1516static int sel_make_initcon_files(struct dentry *dir)
1517{
1518	int i;
1519
1520	for (i = 1; i <= SECINITSID_NUM; i++) {
1521		struct inode *inode;
1522		struct dentry *dentry;
1523		dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1524		if (!dentry)
1525			return -ENOMEM;
1526
1527		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1528		if (!inode)
1529			return -ENOMEM;
1530
1531		inode->i_fop = &sel_initcon_ops;
1532		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1533		d_add(dentry, inode);
1534	}
1535
1536	return 0;
1537}
1538
 
 
 
 
 
1539static inline unsigned long sel_class_to_ino(u16 class)
1540{
1541	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1542}
1543
1544static inline u16 sel_ino_to_class(unsigned long ino)
1545{
1546	return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1547}
1548
1549static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1550{
1551	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1552}
1553
1554static inline u32 sel_ino_to_perm(unsigned long ino)
1555{
1556	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1557}
1558
1559static ssize_t sel_read_class(struct file *file, char __user *buf,
1560				size_t count, loff_t *ppos)
1561{
1562	unsigned long ino = file_inode(file)->i_ino;
1563	char res[TMPBUFLEN];
1564	ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1565	return simple_read_from_buffer(buf, count, ppos, res, len);
 
 
 
 
 
 
 
 
 
1566}
1567
1568static const struct file_operations sel_class_ops = {
1569	.read		= sel_read_class,
1570	.llseek		= generic_file_llseek,
1571};
1572
1573static ssize_t sel_read_perm(struct file *file, char __user *buf,
1574				size_t count, loff_t *ppos)
1575{
1576	unsigned long ino = file_inode(file)->i_ino;
1577	char res[TMPBUFLEN];
1578	ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1579	return simple_read_from_buffer(buf, count, ppos, res, len);
 
 
 
 
 
 
 
 
 
1580}
1581
1582static const struct file_operations sel_perm_ops = {
1583	.read		= sel_read_perm,
1584	.llseek		= generic_file_llseek,
1585};
1586
1587static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1588				  size_t count, loff_t *ppos)
1589{
1590	int value;
1591	char tmpbuf[TMPBUFLEN];
1592	ssize_t length;
1593	unsigned long i_ino = file_inode(file)->i_ino;
1594
1595	value = security_policycap_supported(i_ino & SEL_INO_MASK);
1596	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1597
1598	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1599}
1600
1601static const struct file_operations sel_policycap_ops = {
1602	.read		= sel_read_policycap,
1603	.llseek		= generic_file_llseek,
1604};
1605
1606static int sel_make_perm_files(char *objclass, int classvalue,
1607				struct dentry *dir)
1608{
1609	int i, rc, nperms;
1610	char **perms;
1611
1612	rc = security_get_permissions(objclass, &perms, &nperms);
1613	if (rc)
1614		return rc;
1615
1616	for (i = 0; i < nperms; i++) {
1617		struct inode *inode;
1618		struct dentry *dentry;
1619
1620		rc = -ENOMEM;
1621		dentry = d_alloc_name(dir, perms[i]);
1622		if (!dentry)
1623			goto out;
1624
1625		rc = -ENOMEM;
1626		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1627		if (!inode)
1628			goto out;
1629
1630		inode->i_fop = &sel_perm_ops;
1631		/* i+1 since perm values are 1-indexed */
1632		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1633		d_add(dentry, inode);
1634	}
1635	rc = 0;
1636out:
1637	for (i = 0; i < nperms; i++)
1638		kfree(perms[i]);
1639	kfree(perms);
1640	return rc;
1641}
1642
1643static int sel_make_class_dir_entries(char *classname, int index,
1644					struct dentry *dir)
1645{
1646	struct dentry *dentry = NULL;
1647	struct inode *inode = NULL;
1648	int rc;
1649
1650	dentry = d_alloc_name(dir, "index");
1651	if (!dentry)
1652		return -ENOMEM;
1653
1654	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1655	if (!inode)
1656		return -ENOMEM;
1657
1658	inode->i_fop = &sel_class_ops;
1659	inode->i_ino = sel_class_to_ino(index);
1660	d_add(dentry, inode);
1661
1662	dentry = sel_make_dir(dir, "perms", &last_class_ino);
1663	if (IS_ERR(dentry))
1664		return PTR_ERR(dentry);
 
 
 
 
1665
1666	rc = sel_make_perm_files(classname, index, dentry);
1667
1668	return rc;
1669}
1670
1671static void sel_remove_classes(void)
1672{
1673	struct list_head *class_node;
1674
1675	list_for_each(class_node, &class_dir->d_subdirs) {
1676		struct dentry *class_subdir = list_entry(class_node,
1677					struct dentry, d_u.d_child);
1678		struct list_head *class_subdir_node;
1679
1680		list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1681			struct dentry *d = list_entry(class_subdir_node,
1682						struct dentry, d_u.d_child);
1683
1684			if (d->d_inode)
1685				if (d->d_inode->i_mode & S_IFDIR)
1686					sel_remove_entries(d);
1687		}
1688
1689		sel_remove_entries(class_subdir);
1690	}
1691
1692	sel_remove_entries(class_dir);
1693}
1694
1695static int sel_make_classes(void)
1696{
1697	int rc, nclasses, i;
1698	char **classes;
1699
1700	/* delete any existing entries */
1701	sel_remove_classes();
1702
1703	rc = security_get_classes(&classes, &nclasses);
1704	if (rc)
1705		return rc;
1706
1707	/* +2 since classes are 1-indexed */
1708	last_class_ino = sel_class_to_ino(nclasses + 2);
1709
1710	for (i = 0; i < nclasses; i++) {
1711		struct dentry *class_name_dir;
1712
1713		class_name_dir = sel_make_dir(class_dir, classes[i],
 
 
 
 
 
1714				&last_class_ino);
1715		if (IS_ERR(class_name_dir)) {
1716			rc = PTR_ERR(class_name_dir);
1717			goto out;
1718		}
1719
1720		/* i+1 since class values are 1-indexed */
1721		rc = sel_make_class_dir_entries(classes[i], i + 1,
1722				class_name_dir);
1723		if (rc)
1724			goto out;
1725	}
1726	rc = 0;
1727out:
1728	for (i = 0; i < nclasses; i++)
1729		kfree(classes[i]);
1730	kfree(classes);
1731	return rc;
1732}
1733
1734static int sel_make_policycap(void)
1735{
1736	unsigned int iter;
1737	struct dentry *dentry = NULL;
1738	struct inode *inode = NULL;
1739
1740	sel_remove_entries(policycap_dir);
1741
1742	for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1743		if (iter < ARRAY_SIZE(policycap_names))
1744			dentry = d_alloc_name(policycap_dir,
1745					      policycap_names[iter]);
1746		else
1747			dentry = d_alloc_name(policycap_dir, "unknown");
1748
1749		if (dentry == NULL)
1750			return -ENOMEM;
1751
1752		inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1753		if (inode == NULL)
1754			return -ENOMEM;
1755
1756		inode->i_fop = &sel_policycap_ops;
1757		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1758		d_add(dentry, inode);
1759	}
1760
1761	return 0;
1762}
1763
1764static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1765			unsigned long *ino)
1766{
1767	struct dentry *dentry = d_alloc_name(dir, name);
1768	struct inode *inode;
1769
1770	if (!dentry)
1771		return ERR_PTR(-ENOMEM);
1772
1773	inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1774	if (!inode) {
1775		dput(dentry);
1776		return ERR_PTR(-ENOMEM);
1777	}
1778
1779	inode->i_op = &simple_dir_inode_operations;
1780	inode->i_fop = &simple_dir_operations;
1781	inode->i_ino = ++(*ino);
1782	/* directory inodes start off with i_nlink == 2 (for "." entry) */
1783	inc_nlink(inode);
1784	d_add(dentry, inode);
1785	/* bump link count on parent directory, too */
1786	inc_nlink(dir->d_inode);
1787
1788	return dentry;
1789}
1790
1791static int sel_fill_super(struct super_block *sb, void *data, int silent)
1792{
1793	int ret;
1794	struct dentry *dentry;
1795	struct inode *inode;
1796	struct inode_security_struct *isec;
1797
1798	static struct tree_descr selinux_files[] = {
1799		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1800		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1801		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1802		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1803		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1804		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1805		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1806		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1807		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1808		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1809		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1810		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1811		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1812		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1813		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1814		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1815		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1816		/* last one */ {""}
1817	};
1818	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1819	if (ret)
1820		goto err;
1821
1822	bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1823	if (IS_ERR(bool_dir)) {
1824		ret = PTR_ERR(bool_dir);
1825		bool_dir = NULL;
 
1826		goto err;
1827	}
 
 
 
 
 
1828
1829	ret = -ENOMEM;
1830	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1831	if (!dentry)
1832		goto err;
1833
1834	ret = -ENOMEM;
1835	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1836	if (!inode)
1837		goto err;
1838
1839	inode->i_ino = ++sel_last_ino;
1840	isec = (struct inode_security_struct *)inode->i_security;
1841	isec->sid = SECINITSID_DEVNULL;
1842	isec->sclass = SECCLASS_CHR_FILE;
1843	isec->initialized = 1;
1844
1845	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1846	d_add(dentry, inode);
1847	selinux_null.dentry = dentry;
 
 
 
 
 
1848
1849	dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1850	if (IS_ERR(dentry)) {
1851		ret = PTR_ERR(dentry);
1852		goto err;
1853	}
1854
1855	ret = sel_make_avc_files(dentry);
1856	if (ret)
1857		goto err;
1858
1859	dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1860	if (IS_ERR(dentry)) {
1861		ret = PTR_ERR(dentry);
 
 
 
 
1862		goto err;
1863	}
1864
1865	ret = sel_make_initcon_files(dentry);
1866	if (ret)
1867		goto err;
1868
1869	class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1870	if (IS_ERR(class_dir)) {
1871		ret = PTR_ERR(class_dir);
1872		class_dir = NULL;
1873		goto err;
1874	}
1875
1876	policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1877	if (IS_ERR(policycap_dir)) {
1878		ret = PTR_ERR(policycap_dir);
1879		policycap_dir = NULL;
1880		goto err;
1881	}
 
 
 
 
 
 
 
 
 
 
 
 
 
1882	return 0;
1883err:
1884	printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1885		__func__);
1886	return ret;
1887}
1888
1889static struct dentry *sel_mount(struct file_system_type *fs_type,
1890		      int flags, const char *dev_name, void *data)
1891{
1892	return mount_single(fs_type, flags, data, sel_fill_super);
1893}
1894
1895static struct file_system_type sel_fs_type = {
1896	.name		= "selinuxfs",
1897	.mount		= sel_mount,
1898	.kill_sb	= kill_litter_super,
1899};
1900
1901struct vfsmount *selinuxfs_mount;
1902static struct kobject *selinuxfs_kobj;
1903
1904static int __init init_sel_fs(void)
1905{
1906	int err;
1907
1908	if (!selinux_enabled)
1909		return 0;
1910
1911	selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1912	if (!selinuxfs_kobj)
1913		return -ENOMEM;
1914
1915	err = register_filesystem(&sel_fs_type);
1916	if (err) {
1917		kobject_put(selinuxfs_kobj);
1918		return err;
1919	}
1920
1921	selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1922	if (IS_ERR(selinuxfs_mount)) {
1923		printk(KERN_ERR "selinuxfs:  could not mount!\n");
1924		err = PTR_ERR(selinuxfs_mount);
1925		selinuxfs_mount = NULL;
1926	}
1927
1928	return err;
1929}
1930
1931__initcall(init_sel_fs);
1932
1933#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1934void exit_sel_fs(void)
1935{
1936	kobject_put(selinuxfs_kobj);
1937	kern_unmount(selinuxfs_mount);
1938	unregister_filesystem(&sel_fs_type);
1939}
1940#endif