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};
  49
  50unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  51
  52static int __init checkreqprot_setup(char *str)
  53{
  54	unsigned long checkreqprot;
  55	if (!strict_strtoul(str, 0, &checkreqprot))
  56		selinux_checkreqprot = checkreqprot ? 1 : 0;
  57	return 1;
  58}
  59__setup("checkreqprot=", checkreqprot_setup);
  60
  61static DEFINE_MUTEX(sel_mutex);
  62
  63/* global data for booleans */
  64static struct dentry *bool_dir;
  65static int bool_num;
  66static char **bool_pending_names;
  67static int *bool_pending_values;
  68
  69/* global data for classes */
  70static struct dentry *class_dir;
  71static unsigned long last_class_ino;
  72
  73static char policy_opened;
  74
  75/* global data for policy capabilities */
  76static struct dentry *policycap_dir;
  77
  78/* Check whether a task is allowed to use a security operation. */
  79static int task_has_security(struct task_struct *tsk,
  80			     u32 perms)
  81{
  82	const struct task_security_struct *tsec;
  83	u32 sid = 0;
  84
  85	rcu_read_lock();
  86	tsec = __task_cred(tsk)->security;
  87	if (tsec)
  88		sid = tsec->sid;
  89	rcu_read_unlock();
  90	if (!tsec)
  91		return -EACCES;
  92
  93	return avc_has_perm(sid, SECINITSID_SECURITY,
  94			    SECCLASS_SECURITY, perms, NULL);
  95}
  96
  97enum sel_inos {
  98	SEL_ROOT_INO = 2,
  99	SEL_LOAD,	/* load policy */
 100	SEL_ENFORCE,	/* get or set enforcing status */
 101	SEL_CONTEXT,	/* validate context */
 102	SEL_ACCESS,	/* compute access decision */
 103	SEL_CREATE,	/* compute create labeling decision */
 104	SEL_RELABEL,	/* compute relabeling decision */
 105	SEL_USER,	/* compute reachable user contexts */
 106	SEL_POLICYVERS,	/* return policy version for this kernel */
 107	SEL_COMMIT_BOOLS, /* commit new boolean values */
 108	SEL_MLS,	/* return if MLS policy is enabled */
 109	SEL_DISABLE,	/* disable SELinux until next reboot */
 110	SEL_MEMBER,	/* compute polyinstantiation membership decision */
 111	SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 112	SEL_COMPAT_NET,	/* whether to use old compat network packet controls */
 113	SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 114	SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 115	SEL_STATUS,	/* export current status using mmap() */
 116	SEL_POLICY,	/* allow userspace to read the in kernel policy */
 
 117	SEL_INO_NEXT,	/* The next inode number to use */
 118};
 119
 120static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 121
 122#define SEL_INITCON_INO_OFFSET		0x01000000
 123#define SEL_BOOL_INO_OFFSET		0x02000000
 124#define SEL_CLASS_INO_OFFSET		0x04000000
 125#define SEL_POLICYCAP_INO_OFFSET	0x08000000
 126#define SEL_INO_MASK			0x00ffffff
 127
 
 
 
 
 128#define TMPBUFLEN	12
 129static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 130				size_t count, loff_t *ppos)
 131{
 
 132	char tmpbuf[TMPBUFLEN];
 133	ssize_t length;
 134
 135	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 
 136	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 137}
 138
 139#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 140static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 141				 size_t count, loff_t *ppos)
 142
 143{
 
 
 144	char *page = NULL;
 145	ssize_t length;
 146	int new_value;
 147
 148	length = -ENOMEM;
 149	if (count >= PAGE_SIZE)
 150		goto out;
 151
 152	/* No partial writes. */
 153	length = EINVAL;
 154	if (*ppos != 0)
 155		goto out;
 156
 157	length = -ENOMEM;
 158	page = (char *)get_zeroed_page(GFP_KERNEL);
 159	if (!page)
 160		goto out;
 161
 162	length = -EFAULT;
 163	if (copy_from_user(page, buf, count))
 164		goto out;
 165
 166	length = -EINVAL;
 167	if (sscanf(page, "%d", &new_value) != 1)
 168		goto out;
 169
 170	if (new_value != selinux_enforcing) {
 171		length = task_has_security(current, SECURITY__SETENFORCE);
 
 
 
 
 
 
 172		if (length)
 173			goto out;
 174		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 175			"enforcing=%d old_enforcing=%d auid=%u ses=%u",
 176			new_value, selinux_enforcing,
 177			audit_get_loginuid(current),
 
 178			audit_get_sessionid(current));
 179		selinux_enforcing = new_value;
 180		if (selinux_enforcing)
 181			avc_ss_reset(0);
 182		selnl_notify_setenforce(selinux_enforcing);
 183		selinux_status_update_setenforce(selinux_enforcing);
 
 
 
 
 184	}
 185	length = count;
 186out:
 187	free_page((unsigned long) page);
 188	return length;
 189}
 190#else
 191#define sel_write_enforce NULL
 192#endif
 193
 194static const struct file_operations sel_enforce_ops = {
 195	.read		= sel_read_enforce,
 196	.write		= sel_write_enforce,
 197	.llseek		= generic_file_llseek,
 198};
 199
 200static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 201					size_t count, loff_t *ppos)
 202{
 
 
 203	char tmpbuf[TMPBUFLEN];
 204	ssize_t length;
 205	ino_t ino = filp->f_path.dentry->d_inode->i_ino;
 206	int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 207		security_get_reject_unknown() : !security_get_allow_unknown();
 
 208
 209	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 210	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 211}
 212
 213static const struct file_operations sel_handle_unknown_ops = {
 214	.read		= sel_read_handle_unknown,
 215	.llseek		= generic_file_llseek,
 216};
 217
 218static int sel_open_handle_status(struct inode *inode, struct file *filp)
 219{
 220	struct page    *status = selinux_kernel_status_page();
 
 221
 222	if (!status)
 223		return -ENOMEM;
 224
 225	filp->private_data = status;
 226
 227	return 0;
 228}
 229
 230static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
 231				      size_t count, loff_t *ppos)
 232{
 233	struct page    *status = filp->private_data;
 234
 235	BUG_ON(!status);
 236
 237	return simple_read_from_buffer(buf, count, ppos,
 238				       page_address(status),
 239				       sizeof(struct selinux_kernel_status));
 240}
 241
 242static int sel_mmap_handle_status(struct file *filp,
 243				  struct vm_area_struct *vma)
 244{
 245	struct page    *status = filp->private_data;
 246	unsigned long	size = vma->vm_end - vma->vm_start;
 247
 248	BUG_ON(!status);
 249
 250	/* only allows one page from the head */
 251	if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
 252		return -EIO;
 253	/* disallow writable mapping */
 254	if (vma->vm_flags & VM_WRITE)
 255		return -EPERM;
 256	/* disallow mprotect() turns it into writable */
 257	vma->vm_flags &= ~VM_MAYWRITE;
 258
 259	return remap_pfn_range(vma, vma->vm_start,
 260			       page_to_pfn(status),
 261			       size, vma->vm_page_prot);
 262}
 263
 264static const struct file_operations sel_handle_status_ops = {
 265	.open		= sel_open_handle_status,
 266	.read		= sel_read_handle_status,
 267	.mmap		= sel_mmap_handle_status,
 268	.llseek		= generic_file_llseek,
 269};
 270
 271#ifdef CONFIG_SECURITY_SELINUX_DISABLE
 272static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 273				 size_t count, loff_t *ppos)
 274
 275{
 276	char *page = NULL;
 
 277	ssize_t length;
 278	int new_value;
 
 
 
 
 
 
 
 
 279
 280	length = -ENOMEM;
 281	if (count >= PAGE_SIZE)
 282		goto out;
 283
 284	/* No partial writes. */
 285	length = -EINVAL;
 286	if (*ppos != 0)
 287		goto out;
 288
 289	length = -ENOMEM;
 290	page = (char *)get_zeroed_page(GFP_KERNEL);
 291	if (!page)
 292		goto out;
 293
 294	length = -EFAULT;
 295	if (copy_from_user(page, buf, count))
 296		goto out;
 297
 298	length = -EINVAL;
 299	if (sscanf(page, "%d", &new_value) != 1)
 300		goto out;
 301
 302	if (new_value) {
 303		length = selinux_disable();
 
 304		if (length)
 305			goto out;
 306		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 307			"selinux=0 auid=%u ses=%u",
 308			audit_get_loginuid(current),
 
 
 309			audit_get_sessionid(current));
 310	}
 311
 312	length = count;
 313out:
 314	free_page((unsigned long) page);
 315	return length;
 316}
 317#else
 318#define sel_write_disable NULL
 319#endif
 320
 321static const struct file_operations sel_disable_ops = {
 322	.write		= sel_write_disable,
 323	.llseek		= generic_file_llseek,
 324};
 325
 326static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 327				   size_t count, loff_t *ppos)
 328{
 329	char tmpbuf[TMPBUFLEN];
 330	ssize_t length;
 331
 332	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 333	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 334}
 335
 336static const struct file_operations sel_policyvers_ops = {
 337	.read		= sel_read_policyvers,
 338	.llseek		= generic_file_llseek,
 339};
 340
 341/* declaration for sel_write_load */
 342static int sel_make_bools(void);
 343static int sel_make_classes(void);
 344static int sel_make_policycap(void);
 
 
 
 345
 346/* declaration for sel_make_class_dirs */
 347static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 348			unsigned long *ino);
 349
 
 
 
 
 
 
 
 350static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 351				size_t count, loff_t *ppos)
 352{
 
 353	char tmpbuf[TMPBUFLEN];
 354	ssize_t length;
 355
 356	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 357			   security_mls_enabled());
 358	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 359}
 360
 361static const struct file_operations sel_mls_ops = {
 362	.read		= sel_read_mls,
 363	.llseek		= generic_file_llseek,
 364};
 365
 366struct policy_load_memory {
 367	size_t len;
 368	void *data;
 369};
 370
 371static int sel_open_policy(struct inode *inode, struct file *filp)
 372{
 
 
 373	struct policy_load_memory *plm = NULL;
 374	int rc;
 375
 376	BUG_ON(filp->private_data);
 377
 378	mutex_lock(&sel_mutex);
 379
 380	rc = task_has_security(current, SECURITY__READ_POLICY);
 
 
 381	if (rc)
 382		goto err;
 383
 384	rc = -EBUSY;
 385	if (policy_opened)
 386		goto err;
 387
 388	rc = -ENOMEM;
 389	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 390	if (!plm)
 391		goto err;
 392
 393	if (i_size_read(inode) != security_policydb_len()) {
 394		mutex_lock(&inode->i_mutex);
 395		i_size_write(inode, security_policydb_len());
 396		mutex_unlock(&inode->i_mutex);
 397	}
 398
 399	rc = security_read_policy(&plm->data, &plm->len);
 400	if (rc)
 401		goto err;
 402
 403	policy_opened = 1;
 
 
 
 
 
 
 404
 405	filp->private_data = plm;
 406
 407	mutex_unlock(&sel_mutex);
 408
 409	return 0;
 410err:
 411	mutex_unlock(&sel_mutex);
 412
 413	if (plm)
 414		vfree(plm->data);
 415	kfree(plm);
 416	return rc;
 417}
 418
 419static int sel_release_policy(struct inode *inode, struct file *filp)
 420{
 
 421	struct policy_load_memory *plm = filp->private_data;
 422
 423	BUG_ON(!plm);
 424
 425	policy_opened = 0;
 426
 427	vfree(plm->data);
 428	kfree(plm);
 429
 430	return 0;
 431}
 432
 433static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 434			       size_t count, loff_t *ppos)
 435{
 436	struct policy_load_memory *plm = filp->private_data;
 437	int ret;
 438
 439	mutex_lock(&sel_mutex);
 440
 441	ret = task_has_security(current, SECURITY__READ_POLICY);
 442	if (ret)
 443		goto out;
 444
 445	ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 446out:
 447	mutex_unlock(&sel_mutex);
 448	return ret;
 449}
 450
 451static int sel_mmap_policy_fault(struct vm_area_struct *vma,
 452				 struct vm_fault *vmf)
 453{
 454	struct policy_load_memory *plm = vma->vm_file->private_data;
 455	unsigned long offset;
 456	struct page *page;
 457
 458	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 459		return VM_FAULT_SIGBUS;
 460
 461	offset = vmf->pgoff << PAGE_SHIFT;
 462	if (offset >= roundup(plm->len, PAGE_SIZE))
 463		return VM_FAULT_SIGBUS;
 464
 465	page = vmalloc_to_page(plm->data + offset);
 466	get_page(page);
 467
 468	vmf->page = page;
 469
 470	return 0;
 471}
 472
 473static struct vm_operations_struct sel_mmap_policy_ops = {
 474	.fault = sel_mmap_policy_fault,
 475	.page_mkwrite = sel_mmap_policy_fault,
 476};
 477
 478static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 479{
 480	if (vma->vm_flags & VM_SHARED) {
 481		/* do not allow mprotect to make mapping writable */
 482		vma->vm_flags &= ~VM_MAYWRITE;
 483
 484		if (vma->vm_flags & VM_WRITE)
 485			return -EACCES;
 486	}
 487
 488	vma->vm_flags |= VM_RESERVED;
 489	vma->vm_ops = &sel_mmap_policy_ops;
 490
 491	return 0;
 492}
 493
 494static const struct file_operations sel_policy_ops = {
 495	.open		= sel_open_policy,
 496	.read		= sel_read_policy,
 497	.mmap		= sel_mmap_policy,
 498	.release	= sel_release_policy,
 499	.llseek		= generic_file_llseek,
 500};
 501
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 502static ssize_t sel_write_load(struct file *file, const char __user *buf,
 503			      size_t count, loff_t *ppos)
 504
 505{
 
 
 506	ssize_t length;
 507	void *data = NULL;
 508
 509	mutex_lock(&sel_mutex);
 510
 511	length = task_has_security(current, SECURITY__LOAD_POLICY);
 
 
 512	if (length)
 513		goto out;
 514
 515	/* No partial writes. */
 516	length = -EINVAL;
 517	if (*ppos != 0)
 518		goto out;
 519
 520	length = -EFBIG;
 521	if (count > 64 * 1024 * 1024)
 522		goto out;
 523
 524	length = -ENOMEM;
 525	data = vmalloc(count);
 526	if (!data)
 527		goto out;
 528
 529	length = -EFAULT;
 530	if (copy_from_user(data, buf, count) != 0)
 531		goto out;
 532
 533	length = security_load_policy(data, count);
 534	if (length)
 
 535		goto out;
 
 536
 537	length = sel_make_bools();
 538	if (length)
 539		goto out1;
 
 
 
 540
 541	length = sel_make_classes();
 542	if (length)
 543		goto out1;
 544
 545	length = sel_make_policycap();
 546	if (length)
 547		goto out1;
 548
 549	length = count;
 550
 551out1:
 552	audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 553		"policy loaded auid=%u ses=%u",
 554		audit_get_loginuid(current),
 555		audit_get_sessionid(current));
 556out:
 557	mutex_unlock(&sel_mutex);
 558	vfree(data);
 559	return length;
 560}
 561
 562static const struct file_operations sel_load_ops = {
 563	.write		= sel_write_load,
 564	.llseek		= generic_file_llseek,
 565};
 566
 567static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 568{
 
 
 569	char *canon = NULL;
 570	u32 sid, len;
 571	ssize_t length;
 572
 573	length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 
 
 574	if (length)
 575		goto out;
 576
 577	length = security_context_to_sid(buf, size, &sid);
 578	if (length)
 579		goto out;
 580
 581	length = security_sid_to_context(sid, &canon, &len);
 582	if (length)
 583		goto out;
 584
 585	length = -ERANGE;
 586	if (len > SIMPLE_TRANSACTION_LIMIT) {
 587		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 588			"payload max\n", __func__, len);
 589		goto out;
 590	}
 591
 592	memcpy(buf, canon, len);
 593	length = len;
 594out:
 595	kfree(canon);
 596	return length;
 597}
 598
 599static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 600				     size_t count, loff_t *ppos)
 601{
 
 602	char tmpbuf[TMPBUFLEN];
 603	ssize_t length;
 604
 605	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 
 606	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 607}
 608
 609static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 610				      size_t count, loff_t *ppos)
 611{
 612	char *page = NULL;
 
 613	ssize_t length;
 614	unsigned int new_value;
 615
 616	length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 
 
 
 617	if (length)
 618		goto out;
 619
 620	length = -ENOMEM;
 621	if (count >= PAGE_SIZE)
 622		goto out;
 623
 624	/* No partial writes. */
 625	length = -EINVAL;
 626	if (*ppos != 0)
 627		goto out;
 628
 629	length = -ENOMEM;
 630	page = (char *)get_zeroed_page(GFP_KERNEL);
 631	if (!page)
 632		goto out;
 633
 634	length = -EFAULT;
 635	if (copy_from_user(page, buf, count))
 636		goto out;
 637
 638	length = -EINVAL;
 639	if (sscanf(page, "%u", &new_value) != 1)
 640		goto out;
 641
 642	selinux_checkreqprot = new_value ? 1 : 0;
 
 
 
 
 
 
 
 
 643	length = count;
 
 
 
 644out:
 645	free_page((unsigned long) page);
 646	return length;
 647}
 648static const struct file_operations sel_checkreqprot_ops = {
 649	.read		= sel_read_checkreqprot,
 650	.write		= sel_write_checkreqprot,
 651	.llseek		= generic_file_llseek,
 652};
 653
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 654/*
 655 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 656 */
 657static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 658static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 659static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 660static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 661static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 662
 663static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 664	[SEL_ACCESS] = sel_write_access,
 665	[SEL_CREATE] = sel_write_create,
 666	[SEL_RELABEL] = sel_write_relabel,
 667	[SEL_USER] = sel_write_user,
 668	[SEL_MEMBER] = sel_write_member,
 669	[SEL_CONTEXT] = sel_write_context,
 670};
 671
 672static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 673{
 674	ino_t ino = file->f_path.dentry->d_inode->i_ino;
 675	char *data;
 676	ssize_t rv;
 677
 678	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 679		return -EINVAL;
 680
 681	data = simple_transaction_get(file, buf, size);
 682	if (IS_ERR(data))
 683		return PTR_ERR(data);
 684
 685	rv = write_op[ino](file, data, size);
 686	if (rv > 0) {
 687		simple_transaction_set(file, rv);
 688		rv = size;
 689	}
 690	return rv;
 691}
 692
 693static const struct file_operations transaction_ops = {
 694	.write		= selinux_transaction_write,
 695	.read		= simple_transaction_read,
 696	.release	= simple_transaction_release,
 697	.llseek		= generic_file_llseek,
 698};
 699
 700/*
 701 * payload - write methods
 702 * If the method has a response, the response should be put in buf,
 703 * and the length returned.  Otherwise return 0 or and -error.
 704 */
 705
 706static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 707{
 
 
 708	char *scon = NULL, *tcon = NULL;
 709	u32 ssid, tsid;
 710	u16 tclass;
 711	struct av_decision avd;
 712	ssize_t length;
 713
 714	length = task_has_security(current, SECURITY__COMPUTE_AV);
 
 
 715	if (length)
 716		goto out;
 717
 718	length = -ENOMEM;
 719	scon = kzalloc(size + 1, GFP_KERNEL);
 720	if (!scon)
 721		goto out;
 722
 723	length = -ENOMEM;
 724	tcon = kzalloc(size + 1, GFP_KERNEL);
 725	if (!tcon)
 726		goto out;
 727
 728	length = -EINVAL;
 729	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 730		goto out;
 731
 732	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
 733	if (length)
 734		goto out;
 735
 736	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
 737	if (length)
 738		goto out;
 739
 740	security_compute_av_user(ssid, tsid, tclass, &avd);
 741
 742	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 743			  "%x %x %x %x %u %x",
 744			  avd.allowed, 0xffffffff,
 745			  avd.auditallow, avd.auditdeny,
 746			  avd.seqno, avd.flags);
 747out:
 748	kfree(tcon);
 749	kfree(scon);
 750	return length;
 751}
 752
 753static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 754{
 
 
 755	char *scon = NULL, *tcon = NULL;
 756	char *namebuf = NULL, *objname = NULL;
 757	u32 ssid, tsid, newsid;
 758	u16 tclass;
 759	ssize_t length;
 760	char *newcon = NULL;
 761	u32 len;
 762	int nargs;
 763
 764	length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 
 
 
 765	if (length)
 766		goto out;
 767
 768	length = -ENOMEM;
 769	scon = kzalloc(size + 1, GFP_KERNEL);
 770	if (!scon)
 771		goto out;
 772
 773	length = -ENOMEM;
 774	tcon = kzalloc(size + 1, GFP_KERNEL);
 775	if (!tcon)
 776		goto out;
 777
 778	length = -ENOMEM;
 779	namebuf = kzalloc(size + 1, GFP_KERNEL);
 780	if (!namebuf)
 781		goto out;
 782
 783	length = -EINVAL;
 784	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
 785	if (nargs < 3 || nargs > 4)
 786		goto out;
 787	if (nargs == 4) {
 788		/*
 789		 * If and when the name of new object to be queried contains
 790		 * either whitespace or multibyte characters, they shall be
 791		 * encoded based on the percentage-encoding rule.
 792		 * If not encoded, the sscanf logic picks up only left-half
 793		 * of the supplied name; splitted by a whitespace unexpectedly.
 794		 */
 795		char   *r, *w;
 796		int     c1, c2;
 797
 798		r = w = namebuf;
 799		do {
 800			c1 = *r++;
 801			if (c1 == '+')
 802				c1 = ' ';
 803			else if (c1 == '%') {
 804				c1 = hex_to_bin(*r++);
 805				if (c1 < 0)
 806					goto out;
 807				c2 = hex_to_bin(*r++);
 808				if (c2 < 0)
 809					goto out;
 810				c1 = (c1 << 4) | c2;
 811			}
 812			*w++ = c1;
 813		} while (c1 != '\0');
 814
 815		objname = namebuf;
 816	}
 817
 818	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
 819	if (length)
 820		goto out;
 821
 822	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
 823	if (length)
 824		goto out;
 825
 826	length = security_transition_sid_user(ssid, tsid, tclass,
 827					      objname, &newsid);
 828	if (length)
 829		goto out;
 830
 831	length = security_sid_to_context(newsid, &newcon, &len);
 832	if (length)
 833		goto out;
 834
 835	length = -ERANGE;
 836	if (len > SIMPLE_TRANSACTION_LIMIT) {
 837		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 838			"payload max\n", __func__, len);
 839		goto out;
 840	}
 841
 842	memcpy(buf, newcon, len);
 843	length = len;
 844out:
 845	kfree(newcon);
 846	kfree(namebuf);
 847	kfree(tcon);
 848	kfree(scon);
 849	return length;
 850}
 851
 852static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 853{
 
 
 854	char *scon = NULL, *tcon = NULL;
 855	u32 ssid, tsid, newsid;
 856	u16 tclass;
 857	ssize_t length;
 858	char *newcon = NULL;
 859	u32 len;
 860
 861	length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 
 
 
 862	if (length)
 863		goto out;
 864
 865	length = -ENOMEM;
 866	scon = kzalloc(size + 1, GFP_KERNEL);
 867	if (!scon)
 868		goto out;
 869
 870	length = -ENOMEM;
 871	tcon = kzalloc(size + 1, GFP_KERNEL);
 872	if (!tcon)
 873		goto out;
 874
 875	length = -EINVAL;
 876	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 877		goto out;
 878
 879	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
 880	if (length)
 881		goto out;
 882
 883	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
 884	if (length)
 885		goto out;
 886
 887	length = security_change_sid(ssid, tsid, tclass, &newsid);
 888	if (length)
 889		goto out;
 890
 891	length = security_sid_to_context(newsid, &newcon, &len);
 892	if (length)
 893		goto out;
 894
 895	length = -ERANGE;
 896	if (len > SIMPLE_TRANSACTION_LIMIT)
 897		goto out;
 898
 899	memcpy(buf, newcon, len);
 900	length = len;
 901out:
 902	kfree(newcon);
 903	kfree(tcon);
 904	kfree(scon);
 905	return length;
 906}
 907
 908static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
 909{
 
 
 910	char *con = NULL, *user = NULL, *ptr;
 911	u32 sid, *sids = NULL;
 912	ssize_t length;
 913	char *newcon;
 914	int i, rc;
 915	u32 len, nsids;
 916
 917	length = task_has_security(current, SECURITY__COMPUTE_USER);
 
 
 
 918	if (length)
 919		goto out;
 920
 921	length = -ENOMEM;
 922	con = kzalloc(size + 1, GFP_KERNEL);
 923	if (!con)
 924		goto out;
 925
 926	length = -ENOMEM;
 927	user = kzalloc(size + 1, GFP_KERNEL);
 928	if (!user)
 929		goto out;
 930
 931	length = -EINVAL;
 932	if (sscanf(buf, "%s %s", con, user) != 2)
 933		goto out;
 934
 935	length = security_context_to_sid(con, strlen(con) + 1, &sid);
 936	if (length)
 937		goto out;
 938
 939	length = security_get_user_sids(sid, user, &sids, &nsids);
 940	if (length)
 941		goto out;
 942
 943	length = sprintf(buf, "%u", nsids) + 1;
 944	ptr = buf + length;
 945	for (i = 0; i < nsids; i++) {
 946		rc = security_sid_to_context(sids[i], &newcon, &len);
 947		if (rc) {
 948			length = rc;
 949			goto out;
 950		}
 951		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 952			kfree(newcon);
 953			length = -ERANGE;
 954			goto out;
 955		}
 956		memcpy(ptr, newcon, len);
 957		kfree(newcon);
 958		ptr += len;
 959		length += len;
 960	}
 961out:
 962	kfree(sids);
 963	kfree(user);
 964	kfree(con);
 965	return length;
 966}
 967
 968static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
 969{
 
 
 970	char *scon = NULL, *tcon = NULL;
 971	u32 ssid, tsid, newsid;
 972	u16 tclass;
 973	ssize_t length;
 974	char *newcon = NULL;
 975	u32 len;
 976
 977	length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 
 
 
 978	if (length)
 979		goto out;
 980
 981	length = -ENOMEM;
 982	scon = kzalloc(size + 1, GFP_KERNEL);
 983	if (!scon)
 984		goto out;
 985
 986	length = -ENOMEM;
 987	tcon = kzalloc(size + 1, GFP_KERNEL);
 988	if (!tcon)
 989		goto out;
 990
 991	length = -EINVAL;
 992	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 993		goto out;
 994
 995	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
 996	if (length)
 997		goto out;
 998
 999	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
1000	if (length)
1001		goto out;
1002
1003	length = security_member_sid(ssid, tsid, tclass, &newsid);
1004	if (length)
1005		goto out;
1006
1007	length = security_sid_to_context(newsid, &newcon, &len);
1008	if (length)
1009		goto out;
1010
1011	length = -ERANGE;
1012	if (len > SIMPLE_TRANSACTION_LIMIT) {
1013		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
1014			"payload max\n", __func__, len);
1015		goto out;
1016	}
1017
1018	memcpy(buf, newcon, len);
1019	length = len;
1020out:
1021	kfree(newcon);
1022	kfree(tcon);
1023	kfree(scon);
1024	return length;
1025}
1026
1027static struct inode *sel_make_inode(struct super_block *sb, int mode)
1028{
1029	struct inode *ret = new_inode(sb);
1030
1031	if (ret) {
1032		ret->i_mode = mode;
1033		ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1034	}
1035	return ret;
1036}
1037
1038static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1039			     size_t count, loff_t *ppos)
1040{
 
1041	char *page = NULL;
1042	ssize_t length;
1043	ssize_t ret;
1044	int cur_enforcing;
1045	struct inode *inode = filep->f_path.dentry->d_inode;
1046	unsigned index = inode->i_ino & SEL_INO_MASK;
1047	const char *name = filep->f_path.dentry->d_name.name;
1048
1049	mutex_lock(&sel_mutex);
1050
1051	ret = -EINVAL;
1052	if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1053		goto out;
 
1054
1055	ret = -ENOMEM;
1056	page = (char *)get_zeroed_page(GFP_KERNEL);
1057	if (!page)
1058		goto out;
1059
1060	cur_enforcing = security_get_bool_value(index);
1061	if (cur_enforcing < 0) {
1062		ret = cur_enforcing;
1063		goto out;
1064	}
1065	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1066			  bool_pending_values[index]);
 
1067	ret = simple_read_from_buffer(buf, count, ppos, page, length);
1068out:
1069	mutex_unlock(&sel_mutex);
1070	free_page((unsigned long)page);
1071	return ret;
 
 
 
 
1072}
1073
1074static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1075			      size_t count, loff_t *ppos)
1076{
 
1077	char *page = NULL;
1078	ssize_t length;
1079	int new_value;
1080	struct inode *inode = filep->f_path.dentry->d_inode;
1081	unsigned index = inode->i_ino & SEL_INO_MASK;
1082	const char *name = filep->f_path.dentry->d_name.name;
1083
1084	mutex_lock(&sel_mutex);
1085
1086	length = task_has_security(current, SECURITY__SETBOOL);
1087	if (length)
1088		goto out;
1089
1090	length = -EINVAL;
1091	if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1092		goto out;
1093
1094	length = -ENOMEM;
1095	if (count >= PAGE_SIZE)
1096		goto out;
1097
1098	/* No partial writes. */
1099	length = -EINVAL;
1100	if (*ppos != 0)
1101		goto out;
1102
1103	length = -ENOMEM;
1104	page = (char *)get_zeroed_page(GFP_KERNEL);
1105	if (!page)
 
 
 
 
 
 
 
 
1106		goto out;
1107
1108	length = -EFAULT;
1109	if (copy_from_user(page, buf, count))
 
1110		goto out;
1111
1112	length = -EINVAL;
1113	if (sscanf(page, "%d", &new_value) != 1)
1114		goto out;
1115
1116	if (new_value)
1117		new_value = 1;
1118
1119	bool_pending_values[index] = new_value;
1120	length = count;
1121
1122out:
1123	mutex_unlock(&sel_mutex);
1124	free_page((unsigned long) page);
1125	return length;
1126}
1127
1128static const struct file_operations sel_bool_ops = {
1129	.read		= sel_read_bool,
1130	.write		= sel_write_bool,
1131	.llseek		= generic_file_llseek,
1132};
1133
1134static ssize_t sel_commit_bools_write(struct file *filep,
1135				      const char __user *buf,
1136				      size_t count, loff_t *ppos)
1137{
 
1138	char *page = NULL;
1139	ssize_t length;
1140	int new_value;
1141
1142	mutex_lock(&sel_mutex);
1143
1144	length = task_has_security(current, SECURITY__SETBOOL);
1145	if (length)
1146		goto out;
1147
1148	length = -ENOMEM;
1149	if (count >= PAGE_SIZE)
1150		goto out;
1151
1152	/* No partial writes. */
1153	length = -EINVAL;
1154	if (*ppos != 0)
1155		goto out;
1156
1157	length = -ENOMEM;
1158	page = (char *)get_zeroed_page(GFP_KERNEL);
1159	if (!page)
1160		goto out;
1161
1162	length = -EFAULT;
1163	if (copy_from_user(page, buf, count))
 
 
 
 
 
 
 
 
 
1164		goto out;
1165
1166	length = -EINVAL;
1167	if (sscanf(page, "%d", &new_value) != 1)
1168		goto out;
1169
1170	length = 0;
1171	if (new_value && bool_pending_values)
1172		length = security_set_bools(bool_num, bool_pending_values);
 
1173
1174	if (!length)
1175		length = count;
1176
1177out:
1178	mutex_unlock(&sel_mutex);
1179	free_page((unsigned long) page);
1180	return length;
1181}
1182
1183static const struct file_operations sel_commit_bools_ops = {
1184	.write		= sel_commit_bools_write,
1185	.llseek		= generic_file_llseek,
1186};
1187
1188static void sel_remove_entries(struct dentry *de)
1189{
1190	struct list_head *node;
1191
1192	spin_lock(&de->d_lock);
1193	node = de->d_subdirs.next;
1194	while (node != &de->d_subdirs) {
1195		struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1196
1197		spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1198		list_del_init(node);
1199
1200		if (d->d_inode) {
1201			dget_dlock(d);
1202			spin_unlock(&de->d_lock);
1203			spin_unlock(&d->d_lock);
1204			d_delete(d);
1205			simple_unlink(de->d_inode, d);
1206			dput(d);
1207			spin_lock(&de->d_lock);
1208		} else
1209			spin_unlock(&d->d_lock);
1210		node = de->d_subdirs.next;
1211	}
1212
1213	spin_unlock(&de->d_lock);
1214}
1215
1216#define BOOL_DIR_NAME "booleans"
1217
1218static int sel_make_bools(void)
1219{
1220	int i, ret;
1221	ssize_t len;
1222	struct dentry *dentry = NULL;
1223	struct dentry *dir = bool_dir;
1224	struct inode *inode = NULL;
1225	struct inode_security_struct *isec;
1226	char **names = NULL, *page;
1227	int num;
1228	int *values = NULL;
1229	u32 sid;
1230
1231	/* remove any existing files */
1232	for (i = 0; i < bool_num; i++)
1233		kfree(bool_pending_names[i]);
1234	kfree(bool_pending_names);
1235	kfree(bool_pending_values);
1236	bool_num = 0;
1237	bool_pending_names = NULL;
1238	bool_pending_values = NULL;
1239
1240	sel_remove_entries(dir);
1241
1242	ret = -ENOMEM;
1243	page = (char *)get_zeroed_page(GFP_KERNEL);
1244	if (!page)
1245		goto out;
1246
1247	ret = security_get_bools(&num, &names, &values);
1248	if (ret)
1249		goto out;
1250
1251	for (i = 0; i < num; i++) {
1252		ret = -ENOMEM;
1253		dentry = d_alloc_name(dir, names[i]);
1254		if (!dentry)
1255			goto out;
1256
1257		ret = -ENOMEM;
1258		inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1259		if (!inode)
 
1260			goto out;
 
1261
1262		ret = -ENAMETOOLONG;
1263		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1264		if (len >= PAGE_SIZE)
 
 
1265			goto out;
 
1266
1267		isec = (struct inode_security_struct *)inode->i_security;
1268		ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1269		if (ret)
1270			goto out;
 
 
 
 
1271
1272		isec->sid = sid;
1273		isec->initialized = 1;
1274		inode->i_fop = &sel_bool_ops;
1275		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1276		d_add(dentry, inode);
1277	}
1278	bool_num = num;
1279	bool_pending_names = names;
1280	bool_pending_values = values;
1281
1282	free_page((unsigned long)page);
1283	return 0;
1284out:
1285	free_page((unsigned long)page);
1286
1287	if (names) {
1288		for (i = 0; i < num; i++)
1289			kfree(names[i]);
1290		kfree(names);
1291	}
1292	kfree(values);
1293	sel_remove_entries(dir);
1294
1295	return ret;
1296}
1297
1298#define NULL_FILE_NAME "null"
1299
1300struct dentry *selinux_null;
1301
1302static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1303					    size_t count, loff_t *ppos)
1304{
 
 
1305	char tmpbuf[TMPBUFLEN];
1306	ssize_t length;
1307
1308	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
 
1309	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1310}
1311
1312static ssize_t sel_write_avc_cache_threshold(struct file *file,
1313					     const char __user *buf,
1314					     size_t count, loff_t *ppos)
1315
1316{
1317	char *page = NULL;
 
 
1318	ssize_t ret;
1319	int new_value;
1320
1321	ret = task_has_security(current, SECURITY__SETSECPARAM);
 
 
 
1322	if (ret)
1323		goto out;
1324
1325	ret = -ENOMEM;
1326	if (count >= PAGE_SIZE)
1327		goto out;
1328
1329	/* No partial writes. */
1330	ret = -EINVAL;
1331	if (*ppos != 0)
1332		goto out;
1333
1334	ret = -ENOMEM;
1335	page = (char *)get_zeroed_page(GFP_KERNEL);
1336	if (!page)
1337		goto out;
1338
1339	ret = -EFAULT;
1340	if (copy_from_user(page, buf, count))
1341		goto out;
1342
1343	ret = -EINVAL;
1344	if (sscanf(page, "%u", &new_value) != 1)
1345		goto out;
1346
1347	avc_cache_threshold = new_value;
1348
1349	ret = count;
1350out:
1351	free_page((unsigned long)page);
1352	return ret;
1353}
1354
1355static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1356				       size_t count, loff_t *ppos)
1357{
 
 
1358	char *page;
1359	ssize_t length;
1360
1361	page = (char *)__get_free_page(GFP_KERNEL);
1362	if (!page)
1363		return -ENOMEM;
1364
1365	length = avc_get_hash_stats(page);
1366	if (length >= 0)
1367		length = simple_read_from_buffer(buf, count, ppos, page, length);
1368	free_page((unsigned long)page);
1369
1370	return length;
1371}
1372
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1373static const struct file_operations sel_avc_cache_threshold_ops = {
1374	.read		= sel_read_avc_cache_threshold,
1375	.write		= sel_write_avc_cache_threshold,
1376	.llseek		= generic_file_llseek,
1377};
1378
1379static const struct file_operations sel_avc_hash_stats_ops = {
1380	.read		= sel_read_avc_hash_stats,
1381	.llseek		= generic_file_llseek,
1382};
1383
1384#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1385static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1386{
1387	int cpu;
1388
1389	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1390		if (!cpu_possible(cpu))
1391			continue;
1392		*idx = cpu + 1;
1393		return &per_cpu(avc_cache_stats, cpu);
1394	}
 
1395	return NULL;
1396}
1397
1398static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1399{
1400	loff_t n = *pos - 1;
1401
1402	if (*pos == 0)
1403		return SEQ_START_TOKEN;
1404
1405	return sel_avc_get_stat_idx(&n);
1406}
1407
1408static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1409{
1410	return sel_avc_get_stat_idx(pos);
1411}
1412
1413static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1414{
1415	struct avc_cache_stats *st = v;
1416
1417	if (v == SEQ_START_TOKEN)
1418		seq_printf(seq, "lookups hits misses allocations reclaims "
1419			   "frees\n");
1420	else {
1421		unsigned int lookups = st->lookups;
1422		unsigned int misses = st->misses;
1423		unsigned int hits = lookups - misses;
1424		seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1425			   hits, misses, st->allocations,
1426			   st->reclaims, st->frees);
1427	}
1428	return 0;
1429}
1430
1431static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1432{ }
1433
1434static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1435	.start		= sel_avc_stats_seq_start,
1436	.next		= sel_avc_stats_seq_next,
1437	.show		= sel_avc_stats_seq_show,
1438	.stop		= sel_avc_stats_seq_stop,
1439};
1440
1441static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1442{
1443	return seq_open(file, &sel_avc_cache_stats_seq_ops);
1444}
1445
1446static const struct file_operations sel_avc_cache_stats_ops = {
1447	.open		= sel_open_avc_cache_stats,
1448	.read		= seq_read,
1449	.llseek		= seq_lseek,
1450	.release	= seq_release,
1451};
1452#endif
1453
1454static int sel_make_avc_files(struct dentry *dir)
1455{
 
 
1456	int i;
1457	static struct tree_descr files[] = {
1458		{ "cache_threshold",
1459		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1460		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1461#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1462		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1463#endif
1464	};
1465
1466	for (i = 0; i < ARRAY_SIZE(files); i++) {
1467		struct inode *inode;
1468		struct dentry *dentry;
1469
1470		dentry = d_alloc_name(dir, files[i].name);
1471		if (!dentry)
1472			return -ENOMEM;
1473
1474		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1475		if (!inode)
 
1476			return -ENOMEM;
 
1477
1478		inode->i_fop = files[i].ops;
1479		inode->i_ino = ++sel_last_ino;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1480		d_add(dentry, inode);
1481	}
1482
1483	return 0;
1484}
1485
1486static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1487				size_t count, loff_t *ppos)
1488{
1489	struct inode *inode;
1490	char *con;
1491	u32 sid, len;
1492	ssize_t ret;
1493
1494	inode = file->f_path.dentry->d_inode;
1495	sid = inode->i_ino&SEL_INO_MASK;
1496	ret = security_sid_to_context(sid, &con, &len);
1497	if (ret)
1498		return ret;
1499
1500	ret = simple_read_from_buffer(buf, count, ppos, con, len);
1501	kfree(con);
1502	return ret;
1503}
1504
1505static const struct file_operations sel_initcon_ops = {
1506	.read		= sel_read_initcon,
1507	.llseek		= generic_file_llseek,
1508};
1509
1510static int sel_make_initcon_files(struct dentry *dir)
1511{
1512	int i;
1513
1514	for (i = 1; i <= SECINITSID_NUM; i++) {
1515		struct inode *inode;
1516		struct dentry *dentry;
1517		dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
 
 
 
 
1518		if (!dentry)
1519			return -ENOMEM;
1520
1521		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1522		if (!inode)
 
1523			return -ENOMEM;
 
1524
1525		inode->i_fop = &sel_initcon_ops;
1526		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1527		d_add(dentry, inode);
1528	}
1529
1530	return 0;
1531}
1532
1533static inline unsigned long sel_class_to_ino(u16 class)
1534{
1535	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1536}
1537
1538static inline u16 sel_ino_to_class(unsigned long ino)
1539{
1540	return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1541}
1542
1543static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1544{
1545	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1546}
1547
1548static inline u32 sel_ino_to_perm(unsigned long ino)
1549{
1550	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1551}
1552
1553static ssize_t sel_read_class(struct file *file, char __user *buf,
1554				size_t count, loff_t *ppos)
1555{
1556	unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1557	char res[TMPBUFLEN];
1558	ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1559	return simple_read_from_buffer(buf, count, ppos, res, len);
1560}
1561
1562static const struct file_operations sel_class_ops = {
1563	.read		= sel_read_class,
1564	.llseek		= generic_file_llseek,
1565};
1566
1567static ssize_t sel_read_perm(struct file *file, char __user *buf,
1568				size_t count, loff_t *ppos)
1569{
1570	unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1571	char res[TMPBUFLEN];
1572	ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1573	return simple_read_from_buffer(buf, count, ppos, res, len);
1574}
1575
1576static const struct file_operations sel_perm_ops = {
1577	.read		= sel_read_perm,
1578	.llseek		= generic_file_llseek,
1579};
1580
1581static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1582				  size_t count, loff_t *ppos)
1583{
 
1584	int value;
1585	char tmpbuf[TMPBUFLEN];
1586	ssize_t length;
1587	unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1588
1589	value = security_policycap_supported(i_ino & SEL_INO_MASK);
1590	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1591
1592	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1593}
1594
1595static const struct file_operations sel_policycap_ops = {
1596	.read		= sel_read_policycap,
1597	.llseek		= generic_file_llseek,
1598};
1599
1600static int sel_make_perm_files(char *objclass, int classvalue,
1601				struct dentry *dir)
 
1602{
1603	int i, rc, nperms;
1604	char **perms;
1605
1606	rc = security_get_permissions(objclass, &perms, &nperms);
1607	if (rc)
1608		return rc;
1609
1610	for (i = 0; i < nperms; i++) {
1611		struct inode *inode;
1612		struct dentry *dentry;
1613
1614		rc = -ENOMEM;
1615		dentry = d_alloc_name(dir, perms[i]);
1616		if (!dentry)
1617			goto out;
1618
1619		rc = -ENOMEM;
1620		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1621		if (!inode)
 
1622			goto out;
 
1623
1624		inode->i_fop = &sel_perm_ops;
1625		/* i+1 since perm values are 1-indexed */
1626		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1627		d_add(dentry, inode);
1628	}
1629	rc = 0;
1630out:
1631	for (i = 0; i < nperms; i++)
1632		kfree(perms[i]);
1633	kfree(perms);
1634	return rc;
1635}
1636
1637static int sel_make_class_dir_entries(char *classname, int index,
1638					struct dentry *dir)
 
1639{
 
 
1640	struct dentry *dentry = NULL;
1641	struct inode *inode = NULL;
1642	int rc;
1643
1644	dentry = d_alloc_name(dir, "index");
1645	if (!dentry)
1646		return -ENOMEM;
1647
1648	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1649	if (!inode)
 
1650		return -ENOMEM;
 
1651
1652	inode->i_fop = &sel_class_ops;
1653	inode->i_ino = sel_class_to_ino(index);
1654	d_add(dentry, inode);
1655
1656	dentry = sel_make_dir(dir, "perms", &last_class_ino);
1657	if (IS_ERR(dentry))
1658		return PTR_ERR(dentry);
1659
1660	rc = sel_make_perm_files(classname, index, dentry);
1661
1662	return rc;
1663}
1664
1665static void sel_remove_classes(void)
 
 
1666{
1667	struct list_head *class_node;
1668
1669	list_for_each(class_node, &class_dir->d_subdirs) {
1670		struct dentry *class_subdir = list_entry(class_node,
1671					struct dentry, d_u.d_child);
1672		struct list_head *class_subdir_node;
1673
1674		list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1675			struct dentry *d = list_entry(class_subdir_node,
1676						struct dentry, d_u.d_child);
1677
1678			if (d->d_inode)
1679				if (d->d_inode->i_mode & S_IFDIR)
1680					sel_remove_entries(d);
1681		}
1682
1683		sel_remove_entries(class_subdir);
1684	}
1685
1686	sel_remove_entries(class_dir);
1687}
1688
1689static int sel_make_classes(void)
1690{
1691	int rc, nclasses, i;
1692	char **classes;
1693
1694	/* delete any existing entries */
1695	sel_remove_classes();
1696
1697	rc = security_get_classes(&classes, &nclasses);
1698	if (rc)
1699		return rc;
1700
1701	/* +2 since classes are 1-indexed */
1702	last_class_ino = sel_class_to_ino(nclasses + 2);
1703
1704	for (i = 0; i < nclasses; i++) {
1705		struct dentry *class_name_dir;
1706
1707		class_name_dir = sel_make_dir(class_dir, classes[i],
1708				&last_class_ino);
1709		if (IS_ERR(class_name_dir)) {
1710			rc = PTR_ERR(class_name_dir);
1711			goto out;
1712		}
1713
1714		/* i+1 since class values are 1-indexed */
1715		rc = sel_make_class_dir_entries(classes[i], i + 1,
1716				class_name_dir);
1717		if (rc)
1718			goto out;
1719	}
1720	rc = 0;
1721out:
1722	for (i = 0; i < nclasses; i++)
1723		kfree(classes[i]);
1724	kfree(classes);
1725	return rc;
1726}
1727
1728static int sel_make_policycap(void)
1729{
1730	unsigned int iter;
1731	struct dentry *dentry = NULL;
1732	struct inode *inode = NULL;
1733
1734	sel_remove_entries(policycap_dir);
1735
1736	for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1737		if (iter < ARRAY_SIZE(policycap_names))
1738			dentry = d_alloc_name(policycap_dir,
1739					      policycap_names[iter]);
1740		else
1741			dentry = d_alloc_name(policycap_dir, "unknown");
1742
1743		if (dentry == NULL)
1744			return -ENOMEM;
1745
1746		inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1747		if (inode == NULL)
 
1748			return -ENOMEM;
 
1749
1750		inode->i_fop = &sel_policycap_ops;
1751		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1752		d_add(dentry, inode);
1753	}
1754
1755	return 0;
1756}
1757
1758static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1759			unsigned long *ino)
1760{
1761	struct dentry *dentry = d_alloc_name(dir, name);
1762	struct inode *inode;
1763
1764	if (!dentry)
1765		return ERR_PTR(-ENOMEM);
1766
1767	inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1768	if (!inode) {
1769		dput(dentry);
1770		return ERR_PTR(-ENOMEM);
1771	}
1772
1773	inode->i_op = &simple_dir_inode_operations;
1774	inode->i_fop = &simple_dir_operations;
1775	inode->i_ino = ++(*ino);
1776	/* directory inodes start off with i_nlink == 2 (for "." entry) */
1777	inc_nlink(inode);
1778	d_add(dentry, inode);
1779	/* bump link count on parent directory, too */
1780	inc_nlink(dir->d_inode);
1781
1782	return dentry;
1783}
1784
1785static int sel_fill_super(struct super_block *sb, void *data, int silent)
 
1786{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1787	int ret;
1788	struct dentry *dentry;
1789	struct inode *inode;
1790	struct inode_security_struct *isec;
1791
1792	static struct tree_descr selinux_files[] = {
1793		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1794		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1795		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1796		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1797		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1798		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1799		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1800		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1801		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1802		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1803		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1804		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1805		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1806		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1807		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1808		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1809		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
 
 
1810		/* last one */ {""}
1811	};
 
 
 
 
 
1812	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1813	if (ret)
1814		goto err;
1815
1816	bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1817	if (IS_ERR(bool_dir)) {
1818		ret = PTR_ERR(bool_dir);
1819		bool_dir = NULL;
 
1820		goto err;
1821	}
1822
1823	ret = -ENOMEM;
1824	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1825	if (!dentry)
1826		goto err;
1827
1828	ret = -ENOMEM;
1829	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1830	if (!inode)
 
1831		goto err;
 
1832
1833	inode->i_ino = ++sel_last_ino;
1834	isec = (struct inode_security_struct *)inode->i_security;
1835	isec->sid = SECINITSID_DEVNULL;
1836	isec->sclass = SECCLASS_CHR_FILE;
1837	isec->initialized = 1;
1838
1839	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1840	d_add(dentry, inode);
1841	selinux_null = dentry;
1842
1843	dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1844	if (IS_ERR(dentry)) {
1845		ret = PTR_ERR(dentry);
1846		goto err;
1847	}
1848
1849	ret = sel_make_avc_files(dentry);
 
 
 
 
 
 
 
 
1850	if (ret)
1851		goto err;
1852
1853	dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1854	if (IS_ERR(dentry)) {
1855		ret = PTR_ERR(dentry);
1856		goto err;
1857	}
1858
1859	ret = sel_make_initcon_files(dentry);
1860	if (ret)
1861		goto err;
1862
1863	class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1864	if (IS_ERR(class_dir)) {
1865		ret = PTR_ERR(class_dir);
1866		class_dir = NULL;
1867		goto err;
1868	}
1869
1870	policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1871	if (IS_ERR(policycap_dir)) {
1872		ret = PTR_ERR(policycap_dir);
1873		policycap_dir = NULL;
 
1874		goto err;
1875	}
 
 
 
 
 
 
 
1876	return 0;
1877err:
1878	printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1879		__func__);
 
 
 
1880	return ret;
1881}
1882
1883static struct dentry *sel_mount(struct file_system_type *fs_type,
1884		      int flags, const char *dev_name, void *data)
 
 
 
 
 
 
 
 
1885{
1886	return mount_single(fs_type, flags, data, sel_fill_super);
 
 
 
 
 
 
 
1887}
1888
1889static struct file_system_type sel_fs_type = {
1890	.name		= "selinuxfs",
1891	.mount		= sel_mount,
1892	.kill_sb	= kill_litter_super,
1893};
1894
1895struct vfsmount *selinuxfs_mount;
1896static struct kobject *selinuxfs_kobj;
1897
1898static int __init init_sel_fs(void)
1899{
 
 
1900	int err;
1901
1902	if (!selinux_enabled)
1903		return 0;
1904
1905	selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1906	if (!selinuxfs_kobj)
1907		return -ENOMEM;
1908
1909	err = register_filesystem(&sel_fs_type);
1910	if (err) {
1911		kobject_put(selinuxfs_kobj);
1912		return err;
1913	}
1914
1915	selinuxfs_mount = kern_mount(&sel_fs_type);
1916	if (IS_ERR(selinuxfs_mount)) {
1917		printk(KERN_ERR "selinuxfs:  could not mount!\n");
1918		err = PTR_ERR(selinuxfs_mount);
1919		selinuxfs_mount = NULL;
1920	}
 
 
 
 
 
 
 
1921
1922	return err;
1923}
1924
1925__initcall(init_sel_fs);
1926
1927#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1928void exit_sel_fs(void)
1929{
1930	kobject_put(selinuxfs_kobj);
 
1931	kern_unmount(selinuxfs_mount);
1932	unregister_filesystem(&sel_fs_type);
1933}
1934#endif