selinuxfs.c 42.2 KB
Newer Older
L
Linus Torvalds 已提交
1 2
/* Updated: Karl MacMillan <kmacmillan@tresys.com>
 *
3
 *	Added conditional policy language extensions
L
Linus Torvalds 已提交
4
 *
5 6
 *  Updated: Hewlett-Packard <paul.moore@hp.com>
 *
7
 *	Added support for the policy capability bitmap
8 9
 *
 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
L
Linus Torvalds 已提交
10 11 12
 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
 *	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
L
Linus Torvalds 已提交
14 15 16 17 18 19 20 21
 *	the Free Software Foundation, version 2.
 */

#include <linux/kernel.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
I
Ingo Molnar 已提交
22
#include <linux/mutex.h>
L
Linus Torvalds 已提交
23 24 25 26 27 28
#include <linux/init.h>
#include <linux/string.h>
#include <linux/security.h>
#include <linux/major.h>
#include <linux/seq_file.h>
#include <linux/percpu.h>
S
Steve Grubb 已提交
29
#include <linux/audit.h>
30
#include <linux/uaccess.h>
L
Linus Torvalds 已提交
31 32 33 34 35 36 37 38 39 40 41

/* selinuxfs pseudo filesystem for exporting the security policy API.
   Based on the proc code and the fs/nfsd/nfsctl.c code. */

#include "flask.h"
#include "avc.h"
#include "avc_ss.h"
#include "security.h"
#include "objsec.h"
#include "conditional.h"

42 43
/* Policy capability filenames */
static char *policycap_names[] = {
E
Eric Paris 已提交
44 45
	"network_peer_controls",
	"open_perms"
46 47
};

L
Linus Torvalds 已提交
48 49 50 51
unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;

static int __init checkreqprot_setup(char *str)
{
52 53 54
	unsigned long checkreqprot;
	if (!strict_strtoul(str, 0, &checkreqprot))
		selinux_checkreqprot = checkreqprot ? 1 : 0;
L
Linus Torvalds 已提交
55 56 57 58
	return 1;
}
__setup("checkreqprot=", checkreqprot_setup);

I
Ingo Molnar 已提交
59
static DEFINE_MUTEX(sel_mutex);
L
Linus Torvalds 已提交
60 61

/* global data for booleans */
62 63
static struct dentry *bool_dir;
static int bool_num;
S
Stephen Smalley 已提交
64
static char **bool_pending_names;
65
static int *bool_pending_values;
L
Linus Torvalds 已提交
66

67
/* global data for classes */
68
static struct dentry *class_dir;
69 70
static unsigned long last_class_ino;

71 72
static char policy_opened;

73
/* global data for policy capabilities */
74
static struct dentry *policycap_dir;
75

L
Linus Torvalds 已提交
76 77 78 79 80 81
extern void selnl_notify_setenforce(int val);

/* Check whether a task is allowed to use a security operation. */
static int task_has_security(struct task_struct *tsk,
			     u32 perms)
{
82 83 84 85 86 87 88 89
	const struct task_security_struct *tsec;
	u32 sid = 0;

	rcu_read_lock();
	tsec = __task_cred(tsk)->security;
	if (tsec)
		sid = tsec->sid;
	rcu_read_unlock();
L
Linus Torvalds 已提交
90 91 92
	if (!tsec)
		return -EACCES;

93
	return avc_has_perm(sid, SECINITSID_SECURITY,
L
Linus Torvalds 已提交
94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
			    SECCLASS_SECURITY, perms, NULL);
}

enum sel_inos {
	SEL_ROOT_INO = 2,
	SEL_LOAD,	/* load policy */
	SEL_ENFORCE,	/* get or set enforcing status */
	SEL_CONTEXT,	/* validate context */
	SEL_ACCESS,	/* compute access decision */
	SEL_CREATE,	/* compute create labeling decision */
	SEL_RELABEL,	/* compute relabeling decision */
	SEL_USER,	/* compute reachable user contexts */
	SEL_POLICYVERS,	/* return policy version for this kernel */
	SEL_COMMIT_BOOLS, /* commit new boolean values */
	SEL_MLS,	/* return if MLS policy is enabled */
	SEL_DISABLE,	/* disable SELinux until next reboot */
	SEL_MEMBER,	/* compute polyinstantiation membership decision */
	SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
112
	SEL_COMPAT_NET,	/* whether to use old compat network packet controls */
113 114
	SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
	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 */
L
Linus Torvalds 已提交
118 119
};

120 121
static unsigned long sel_last_ino = SEL_INO_NEXT - 1;

122 123 124 125 126
#define SEL_INITCON_INO_OFFSET		0x01000000
#define SEL_BOOL_INO_OFFSET		0x02000000
#define SEL_CLASS_INO_OFFSET		0x04000000
#define SEL_POLICYCAP_INO_OFFSET	0x08000000
#define SEL_INO_MASK			0x00ffffff
127

L
Linus Torvalds 已提交
128 129 130 131 132 133 134 135 136 137 138 139
#define TMPBUFLEN	12
static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
				size_t count, loff_t *ppos)
{
	char tmpbuf[TMPBUFLEN];
	ssize_t length;

	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
140
static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
L
Linus Torvalds 已提交
141 142 143
				 size_t count, loff_t *ppos)

{
144
	char *page = NULL;
L
Linus Torvalds 已提交
145 146 147
	ssize_t length;
	int new_value;

148
	length = -ENOMEM;
149
	if (count >= PAGE_SIZE)
150 151 152 153 154 155 156 157
		goto out;

	/* No partial writes. */
	length = EINVAL;
	if (*ppos != 0)
		goto out;

	length = -ENOMEM;
158
	page = (char *)get_zeroed_page(GFP_KERNEL);
L
Linus Torvalds 已提交
159
	if (!page)
160 161
		goto out;

L
Linus Torvalds 已提交
162 163 164 165 166 167 168 169 170 171 172 173
	length = -EFAULT;
	if (copy_from_user(page, buf, count))
		goto out;

	length = -EINVAL;
	if (sscanf(page, "%d", &new_value) != 1)
		goto out;

	if (new_value != selinux_enforcing) {
		length = task_has_security(current, SECURITY__SETENFORCE);
		if (length)
			goto out;
S
Steve Grubb 已提交
174
		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
175 176 177 178
			"enforcing=%d old_enforcing=%d auid=%u ses=%u",
			new_value, selinux_enforcing,
			audit_get_loginuid(current),
			audit_get_sessionid(current));
L
Linus Torvalds 已提交
179 180 181 182
		selinux_enforcing = new_value;
		if (selinux_enforcing)
			avc_ss_reset(0);
		selnl_notify_setenforce(selinux_enforcing);
183
		selinux_status_update_setenforce(selinux_enforcing);
L
Linus Torvalds 已提交
184 185 186 187 188 189 190 191 192 193
	}
	length = count;
out:
	free_page((unsigned long) page);
	return length;
}
#else
#define sel_write_enforce NULL
#endif

194
static const struct file_operations sel_enforce_ops = {
L
Linus Torvalds 已提交
195 196
	.read		= sel_read_enforce,
	.write		= sel_write_enforce,
A
Arnd Bergmann 已提交
197
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
198 199
};

200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
					size_t count, loff_t *ppos)
{
	char tmpbuf[TMPBUFLEN];
	ssize_t length;
	ino_t ino = filp->f_path.dentry->d_inode->i_ino;
	int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
		security_get_reject_unknown() : !security_get_allow_unknown();

	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

static const struct file_operations sel_handle_unknown_ops = {
	.read		= sel_read_handle_unknown,
A
Arnd Bergmann 已提交
215
	.llseek		= generic_file_llseek,
216 217
};

218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270
static int sel_open_handle_status(struct inode *inode, struct file *filp)
{
	struct page    *status = selinux_kernel_status_page();

	if (!status)
		return -ENOMEM;

	filp->private_data = status;

	return 0;
}

static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
				      size_t count, loff_t *ppos)
{
	struct page    *status = filp->private_data;

	BUG_ON(!status);

	return simple_read_from_buffer(buf, count, ppos,
				       page_address(status),
				       sizeof(struct selinux_kernel_status));
}

static int sel_mmap_handle_status(struct file *filp,
				  struct vm_area_struct *vma)
{
	struct page    *status = filp->private_data;
	unsigned long	size = vma->vm_end - vma->vm_start;

	BUG_ON(!status);

	/* only allows one page from the head */
	if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
		return -EIO;
	/* disallow writable mapping */
	if (vma->vm_flags & VM_WRITE)
		return -EPERM;
	/* disallow mprotect() turns it into writable */
	vma->vm_flags &= ~VM_MAYWRITE;

	return remap_pfn_range(vma, vma->vm_start,
			       page_to_pfn(status),
			       size, vma->vm_page_prot);
}

static const struct file_operations sel_handle_status_ops = {
	.open		= sel_open_handle_status,
	.read		= sel_read_handle_status,
	.mmap		= sel_mmap_handle_status,
	.llseek		= generic_file_llseek,
};

L
Linus Torvalds 已提交
271
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
272
static ssize_t sel_write_disable(struct file *file, const char __user *buf,
L
Linus Torvalds 已提交
273 274 275
				 size_t count, loff_t *ppos)

{
276
	char *page = NULL;
L
Linus Torvalds 已提交
277 278 279 280
	ssize_t length;
	int new_value;
	extern int selinux_disable(void);

281
	length = -ENOMEM;
282
	if (count >= PAGE_SIZE)
283 284 285 286 287 288 289 290
		goto out;;

	/* No partial writes. */
	length = -EINVAL;
	if (*ppos != 0)
		goto out;

	length = -ENOMEM;
291
	page = (char *)get_zeroed_page(GFP_KERNEL);
L
Linus Torvalds 已提交
292
	if (!page)
293 294
		goto out;

L
Linus Torvalds 已提交
295 296 297 298 299 300 301 302 303 304
	length = -EFAULT;
	if (copy_from_user(page, buf, count))
		goto out;

	length = -EINVAL;
	if (sscanf(page, "%d", &new_value) != 1)
		goto out;

	if (new_value) {
		length = selinux_disable();
305
		if (length)
L
Linus Torvalds 已提交
306
			goto out;
S
Steve Grubb 已提交
307
		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
308 309 310
			"selinux=0 auid=%u ses=%u",
			audit_get_loginuid(current),
			audit_get_sessionid(current));
L
Linus Torvalds 已提交
311 312 313 314 315 316 317 318 319 320 321
	}

	length = count;
out:
	free_page((unsigned long) page);
	return length;
}
#else
#define sel_write_disable NULL
#endif

322
static const struct file_operations sel_disable_ops = {
L
Linus Torvalds 已提交
323
	.write		= sel_write_disable,
A
Arnd Bergmann 已提交
324
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
325 326 327
};

static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
328
				   size_t count, loff_t *ppos)
L
Linus Torvalds 已提交
329 330 331 332 333 334 335 336
{
	char tmpbuf[TMPBUFLEN];
	ssize_t length;

	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

337
static const struct file_operations sel_policyvers_ops = {
L
Linus Torvalds 已提交
338
	.read		= sel_read_policyvers,
A
Arnd Bergmann 已提交
339
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
340 341 342 343
};

/* declaration for sel_write_load */
static int sel_make_bools(void);
344
static int sel_make_classes(void);
345
static int sel_make_policycap(void);
346 347 348 349

/* declaration for sel_make_class_dirs */
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
			unsigned long *ino);
L
Linus Torvalds 已提交
350 351 352 353 354 355 356

static ssize_t sel_read_mls(struct file *filp, char __user *buf,
				size_t count, loff_t *ppos)
{
	char tmpbuf[TMPBUFLEN];
	ssize_t length;

357 358
	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
			   security_mls_enabled());
L
Linus Torvalds 已提交
359 360 361
	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

362
static const struct file_operations sel_mls_ops = {
L
Linus Torvalds 已提交
363
	.read		= sel_read_mls,
A
Arnd Bergmann 已提交
364
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
365 366
};

367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451
struct policy_load_memory {
	size_t len;
	void *data;
};

static int sel_open_policy(struct inode *inode, struct file *filp)
{
	struct policy_load_memory *plm = NULL;
	int rc;

	BUG_ON(filp->private_data);

	mutex_lock(&sel_mutex);

	rc = task_has_security(current, SECURITY__READ_POLICY);
	if (rc)
		goto err;

	rc = -EBUSY;
	if (policy_opened)
		goto err;

	rc = -ENOMEM;
	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
	if (!plm)
		goto err;

	if (i_size_read(inode) != security_policydb_len()) {
		mutex_lock(&inode->i_mutex);
		i_size_write(inode, security_policydb_len());
		mutex_unlock(&inode->i_mutex);
	}

	rc = security_read_policy(&plm->data, &plm->len);
	if (rc)
		goto err;

	policy_opened = 1;

	filp->private_data = plm;

	mutex_unlock(&sel_mutex);

	return 0;
err:
	mutex_unlock(&sel_mutex);

	if (plm)
		vfree(plm->data);
	kfree(plm);
	return rc;
}

static int sel_release_policy(struct inode *inode, struct file *filp)
{
	struct policy_load_memory *plm = filp->private_data;

	BUG_ON(!plm);

	policy_opened = 0;

	vfree(plm->data);
	kfree(plm);

	return 0;
}

static ssize_t sel_read_policy(struct file *filp, char __user *buf,
			       size_t count, loff_t *ppos)
{
	struct policy_load_memory *plm = filp->private_data;
	int ret;

	mutex_lock(&sel_mutex);

	ret = task_has_security(current, SECURITY__READ_POLICY);
	if (ret)
		goto out;

	ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
out:
	mutex_unlock(&sel_mutex);
	return ret;
}

452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
static int sel_mmap_policy_fault(struct vm_area_struct *vma,
				 struct vm_fault *vmf)
{
	struct policy_load_memory *plm = vma->vm_file->private_data;
	unsigned long offset;
	struct page *page;

	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
		return VM_FAULT_SIGBUS;

	offset = vmf->pgoff << PAGE_SHIFT;
	if (offset >= roundup(plm->len, PAGE_SIZE))
		return VM_FAULT_SIGBUS;

	page = vmalloc_to_page(plm->data + offset);
	get_page(page);

	vmf->page = page;

	return 0;
}

static struct vm_operations_struct sel_mmap_policy_ops = {
	.fault = sel_mmap_policy_fault,
	.page_mkwrite = sel_mmap_policy_fault,
};

int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
{
	if (vma->vm_flags & VM_SHARED) {
		/* do not allow mprotect to make mapping writable */
		vma->vm_flags &= ~VM_MAYWRITE;

		if (vma->vm_flags & VM_WRITE)
			return -EACCES;
	}

	vma->vm_flags |= VM_RESERVED;
	vma->vm_ops = &sel_mmap_policy_ops;

	return 0;
}

495 496 497
static const struct file_operations sel_policy_ops = {
	.open		= sel_open_policy,
	.read		= sel_read_policy,
498
	.mmap		= sel_mmap_policy,
499 500 501
	.release	= sel_release_policy,
};

502
static ssize_t sel_write_load(struct file *file, const char __user *buf,
L
Linus Torvalds 已提交
503 504 505 506 507 508
			      size_t count, loff_t *ppos)

{
	ssize_t length;
	void *data = NULL;

I
Ingo Molnar 已提交
509
	mutex_lock(&sel_mutex);
L
Linus Torvalds 已提交
510 511 512 513 514

	length = task_has_security(current, SECURITY__LOAD_POLICY);
	if (length)
		goto out;

515 516 517
	/* No partial writes. */
	length = -EINVAL;
	if (*ppos != 0)
L
Linus Torvalds 已提交
518 519
		goto out;

520 521 522 523 524 525 526
	length = -EFBIG;
	if (count > 64 * 1024 * 1024)
		goto out;

	length = -ENOMEM;
	data = vmalloc(count);
	if (!data)
L
Linus Torvalds 已提交
527 528 529 530 531 532 533 534 535 536
		goto out;

	length = -EFAULT;
	if (copy_from_user(data, buf, count) != 0)
		goto out;

	length = security_load_policy(data, count);
	if (length)
		goto out;

537 538
	length = sel_make_bools();
	if (length)
539 540
		goto out1;

541 542
	length = sel_make_classes();
	if (length)
543 544
		goto out1;

545 546 547 548 549
	length = sel_make_policycap();
	if (length)
		goto out1;

	length = count;
550 551

out1:
S
Steve Grubb 已提交
552
	audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
553 554 555
		"policy loaded auid=%u ses=%u",
		audit_get_loginuid(current),
		audit_get_sessionid(current));
L
Linus Torvalds 已提交
556
out:
I
Ingo Molnar 已提交
557
	mutex_unlock(&sel_mutex);
L
Linus Torvalds 已提交
558 559 560 561
	vfree(data);
	return length;
}

562
static const struct file_operations sel_load_ops = {
L
Linus Torvalds 已提交
563
	.write		= sel_write_load,
A
Arnd Bergmann 已提交
564
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
565 566
};

567
static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
L
Linus Torvalds 已提交
568
{
569
	char *canon = NULL;
570
	u32 sid, len;
L
Linus Torvalds 已提交
571 572 573 574
	ssize_t length;

	length = task_has_security(current, SECURITY__CHECK_CONTEXT);
	if (length)
575
		goto out;
L
Linus Torvalds 已提交
576

577
	length = security_context_to_sid(buf, size, &sid);
578 579
	if (length)
		goto out;
L
Linus Torvalds 已提交
580

581
	length = security_sid_to_context(sid, &canon, &len);
582 583
	if (length)
		goto out;
584

585
	length = -ERANGE;
586
	if (len > SIMPLE_TRANSACTION_LIMIT) {
E
Eric Paris 已提交
587 588
		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
			"payload max\n", __func__, len);
L
Linus Torvalds 已提交
589
		goto out;
590
	}
L
Linus Torvalds 已提交
591

592 593
	memcpy(buf, canon, len);
	length = len;
L
Linus Torvalds 已提交
594
out:
595
	kfree(canon);
L
Linus Torvalds 已提交
596 597 598 599 600 601 602 603 604 605 606 607 608
	return length;
}

static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
				     size_t count, loff_t *ppos)
{
	char tmpbuf[TMPBUFLEN];
	ssize_t length;

	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

609
static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
L
Linus Torvalds 已提交
610 611
				      size_t count, loff_t *ppos)
{
612
	char *page = NULL;
L
Linus Torvalds 已提交
613 614 615 616 617
	ssize_t length;
	unsigned int new_value;

	length = task_has_security(current, SECURITY__SETCHECKREQPROT);
	if (length)
618
		goto out;
L
Linus Torvalds 已提交
619

620
	length = -ENOMEM;
621
	if (count >= PAGE_SIZE)
622 623 624 625 626 627 628 629
		goto out;

	/* No partial writes. */
	length = -EINVAL;
	if (*ppos != 0)
		goto out;

	length = -ENOMEM;
630
	page = (char *)get_zeroed_page(GFP_KERNEL);
L
Linus Torvalds 已提交
631
	if (!page)
632 633
		goto out;

L
Linus Torvalds 已提交
634 635 636 637 638 639 640 641 642 643 644 645 646 647
	length = -EFAULT;
	if (copy_from_user(page, buf, count))
		goto out;

	length = -EINVAL;
	if (sscanf(page, "%u", &new_value) != 1)
		goto out;

	selinux_checkreqprot = new_value ? 1 : 0;
	length = count;
out:
	free_page((unsigned long) page);
	return length;
}
648
static const struct file_operations sel_checkreqprot_ops = {
L
Linus Torvalds 已提交
649 650
	.read		= sel_read_checkreqprot,
	.write		= sel_write_checkreqprot,
A
Arnd Bergmann 已提交
651
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
652 653 654 655 656
};

/*
 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 */
657 658 659 660 661
static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
L
Linus Torvalds 已提交
662 663 664 665 666 667 668

static ssize_t (*write_op[])(struct file *, char *, size_t) = {
	[SEL_ACCESS] = sel_write_access,
	[SEL_CREATE] = sel_write_create,
	[SEL_RELABEL] = sel_write_relabel,
	[SEL_USER] = sel_write_user,
	[SEL_MEMBER] = sel_write_member,
669
	[SEL_CONTEXT] = sel_write_context,
L
Linus Torvalds 已提交
670 671 672 673
};

static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
{
674
	ino_t ino = file->f_path.dentry->d_inode->i_ino;
L
Linus Torvalds 已提交
675 676 677
	char *data;
	ssize_t rv;

678
	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
L
Linus Torvalds 已提交
679 680 681 682 683 684
		return -EINVAL;

	data = simple_transaction_get(file, buf, size);
	if (IS_ERR(data))
		return PTR_ERR(data);

685 686
	rv = write_op[ino](file, data, size);
	if (rv > 0) {
L
Linus Torvalds 已提交
687 688 689 690 691 692
		simple_transaction_set(file, rv);
		rv = size;
	}
	return rv;
}

693
static const struct file_operations transaction_ops = {
L
Linus Torvalds 已提交
694 695 696
	.write		= selinux_transaction_write,
	.read		= simple_transaction_read,
	.release	= simple_transaction_release,
A
Arnd Bergmann 已提交
697
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
698 699 700 701 702 703 704 705
};

/*
 * payload - write methods
 * If the method has a response, the response should be put in buf,
 * and the length returned.  Otherwise return 0 or and -error.
 */

706
static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
L
Linus Torvalds 已提交
707
{
708
	char *scon = NULL, *tcon = NULL;
L
Linus Torvalds 已提交
709 710 711 712 713 714 715
	u32 ssid, tsid;
	u16 tclass;
	struct av_decision avd;
	ssize_t length;

	length = task_has_security(current, SECURITY__COMPUTE_AV);
	if (length)
716
		goto out;
L
Linus Torvalds 已提交
717 718

	length = -ENOMEM;
719
	scon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
720
	if (!scon)
721
		goto out;
L
Linus Torvalds 已提交
722

723
	length = -ENOMEM;
724
	tcon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
725 726 727 728
	if (!tcon)
		goto out;

	length = -EINVAL;
729
	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
730
		goto out;
L
Linus Torvalds 已提交
731

732
	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
733 734 735
	if (length)
		goto out;

736
	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
737 738
	if (length)
		goto out;
L
Linus Torvalds 已提交
739

740
	security_compute_av_user(ssid, tsid, tclass, &avd);
L
Linus Torvalds 已提交
741 742

	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
743
			  "%x %x %x %x %u %x",
744
			  avd.allowed, 0xffffffff,
L
Linus Torvalds 已提交
745
			  avd.auditallow, avd.auditdeny,
746
			  avd.seqno, avd.flags);
L
Linus Torvalds 已提交
747
out:
748
	kfree(tcon);
L
Linus Torvalds 已提交
749 750 751 752
	kfree(scon);
	return length;
}

753
static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
L
Linus Torvalds 已提交
754
{
755
	char *scon = NULL, *tcon = NULL;
L
Linus Torvalds 已提交
756 757 758
	u32 ssid, tsid, newsid;
	u16 tclass;
	ssize_t length;
759
	char *newcon = NULL;
L
Linus Torvalds 已提交
760 761 762 763
	u32 len;

	length = task_has_security(current, SECURITY__COMPUTE_CREATE);
	if (length)
764
		goto out;
L
Linus Torvalds 已提交
765 766

	length = -ENOMEM;
767
	scon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
768
	if (!scon)
769
		goto out;
L
Linus Torvalds 已提交
770

771
	length = -ENOMEM;
772
	tcon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
773 774 775 776 777
	if (!tcon)
		goto out;

	length = -EINVAL;
	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
778
		goto out;
L
Linus Torvalds 已提交
779

780
	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
781 782 783
	if (length)
		goto out;

784
	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
785 786
	if (length)
		goto out;
L
Linus Torvalds 已提交
787

788
	length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
789 790
	if (length)
		goto out;
L
Linus Torvalds 已提交
791 792

	length = security_sid_to_context(newsid, &newcon, &len);
793 794
	if (length)
		goto out;
L
Linus Torvalds 已提交
795

796
	length = -ERANGE;
L
Linus Torvalds 已提交
797
	if (len > SIMPLE_TRANSACTION_LIMIT) {
E
Eric Paris 已提交
798 799
		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
			"payload max\n", __func__, len);
800
		goto out;
L
Linus Torvalds 已提交
801 802 803 804
	}

	memcpy(buf, newcon, len);
	length = len;
805
out:
L
Linus Torvalds 已提交
806 807 808 809 810 811
	kfree(newcon);
	kfree(tcon);
	kfree(scon);
	return length;
}

812
static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
L
Linus Torvalds 已提交
813
{
814
	char *scon = NULL, *tcon = NULL;
L
Linus Torvalds 已提交
815 816 817
	u32 ssid, tsid, newsid;
	u16 tclass;
	ssize_t length;
818
	char *newcon = NULL;
L
Linus Torvalds 已提交
819 820 821 822
	u32 len;

	length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
	if (length)
823
		goto out;
L
Linus Torvalds 已提交
824 825

	length = -ENOMEM;
826
	scon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
827
	if (!scon)
828
		goto out;
L
Linus Torvalds 已提交
829

830
	length = -ENOMEM;
831
	tcon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
832 833 834 835 836
	if (!tcon)
		goto out;

	length = -EINVAL;
	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
837
		goto out;
L
Linus Torvalds 已提交
838

839
	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
840 841 842
	if (length)
		goto out;

843
	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
844 845
	if (length)
		goto out;
L
Linus Torvalds 已提交
846 847

	length = security_change_sid(ssid, tsid, tclass, &newsid);
848 849
	if (length)
		goto out;
L
Linus Torvalds 已提交
850 851

	length = security_sid_to_context(newsid, &newcon, &len);
852 853
	if (length)
		goto out;
L
Linus Torvalds 已提交
854

855 856 857
	length = -ERANGE;
	if (len > SIMPLE_TRANSACTION_LIMIT)
		goto out;
L
Linus Torvalds 已提交
858 859 860

	memcpy(buf, newcon, len);
	length = len;
861
out:
L
Linus Torvalds 已提交
862 863 864 865 866 867
	kfree(newcon);
	kfree(tcon);
	kfree(scon);
	return length;
}

868
static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
L
Linus Torvalds 已提交
869
{
870 871
	char *con = NULL, *user = NULL, *ptr;
	u32 sid, *sids = NULL;
L
Linus Torvalds 已提交
872 873 874 875 876 877 878
	ssize_t length;
	char *newcon;
	int i, rc;
	u32 len, nsids;

	length = task_has_security(current, SECURITY__COMPUTE_USER);
	if (length)
879
		goto out;;
L
Linus Torvalds 已提交
880 881

	length = -ENOMEM;
882
	con = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
883
	if (!con)
884
		goto out;;
L
Linus Torvalds 已提交
885

886
	length = -ENOMEM;
887
	user = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
888 889 890 891 892
	if (!user)
		goto out;

	length = -EINVAL;
	if (sscanf(buf, "%s %s", con, user) != 2)
893
		goto out;
L
Linus Torvalds 已提交
894

895
	length = security_context_to_sid(con, strlen(con) + 1, &sid);
896 897
	if (length)
		goto out;
L
Linus Torvalds 已提交
898 899

	length = security_get_user_sids(sid, user, &sids, &nsids);
900 901
	if (length)
		goto out;
L
Linus Torvalds 已提交
902 903 904 905 906 907 908

	length = sprintf(buf, "%u", nsids) + 1;
	ptr = buf + length;
	for (i = 0; i < nsids; i++) {
		rc = security_sid_to_context(sids[i], &newcon, &len);
		if (rc) {
			length = rc;
909
			goto out;
L
Linus Torvalds 已提交
910 911 912 913
		}
		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
			kfree(newcon);
			length = -ERANGE;
914
			goto out;
L
Linus Torvalds 已提交
915 916 917 918 919 920
		}
		memcpy(ptr, newcon, len);
		kfree(newcon);
		ptr += len;
		length += len;
	}
921
out:
L
Linus Torvalds 已提交
922 923 924 925 926 927
	kfree(sids);
	kfree(user);
	kfree(con);
	return length;
}

928
static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
L
Linus Torvalds 已提交
929
{
930
	char *scon = NULL, *tcon = NULL;
L
Linus Torvalds 已提交
931 932 933
	u32 ssid, tsid, newsid;
	u16 tclass;
	ssize_t length;
934
	char *newcon = NULL;
L
Linus Torvalds 已提交
935 936 937 938
	u32 len;

	length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
	if (length)
939
		goto out;
L
Linus Torvalds 已提交
940 941

	length = -ENOMEM;
942
	scon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
943
	if (!scon)
944
		goto out;;
L
Linus Torvalds 已提交
945

946
	length = -ENOMEM;
947
	tcon = kzalloc(size + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
948 949 950 951 952
	if (!tcon)
		goto out;

	length = -EINVAL;
	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
953
		goto out;
L
Linus Torvalds 已提交
954

955
	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
956 957 958
	if (length)
		goto out;

959
	length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
960 961
	if (length)
		goto out;
L
Linus Torvalds 已提交
962 963

	length = security_member_sid(ssid, tsid, tclass, &newsid);
964 965
	if (length)
		goto out;
L
Linus Torvalds 已提交
966 967

	length = security_sid_to_context(newsid, &newcon, &len);
968 969
	if (length)
		goto out;
L
Linus Torvalds 已提交
970

971
	length = -ERANGE;
L
Linus Torvalds 已提交
972
	if (len > SIMPLE_TRANSACTION_LIMIT) {
E
Eric Paris 已提交
973 974
		printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
			"payload max\n", __func__, len);
975
		goto out;
L
Linus Torvalds 已提交
976 977 978 979
	}

	memcpy(buf, newcon, len);
	length = len;
980
out:
L
Linus Torvalds 已提交
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
	kfree(newcon);
	kfree(tcon);
	kfree(scon);
	return length;
}

static struct inode *sel_make_inode(struct super_block *sb, int mode)
{
	struct inode *ret = new_inode(sb);

	if (ret) {
		ret->i_mode = mode;
		ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
	}
	return ret;
}

static ssize_t sel_read_bool(struct file *filep, char __user *buf,
			     size_t count, loff_t *ppos)
{
	char *page = NULL;
	ssize_t length;
	ssize_t ret;
	int cur_enforcing;
S
Stephen Smalley 已提交
1005 1006 1007
	struct inode *inode = filep->f_path.dentry->d_inode;
	unsigned index = inode->i_ino & SEL_INO_MASK;
	const char *name = filep->f_path.dentry->d_name.name;
L
Linus Torvalds 已提交
1008

I
Ingo Molnar 已提交
1009
	mutex_lock(&sel_mutex);
L
Linus Torvalds 已提交
1010

1011 1012
	ret = -EINVAL;
	if (index >= bool_num || strcmp(name, bool_pending_names[index]))
S
Stephen Smalley 已提交
1013
		goto out;
L
Linus Torvalds 已提交
1014

1015
	ret = -ENOMEM;
1016
	page = (char *)get_zeroed_page(GFP_KERNEL);
1017
	if (!page)
L
Linus Torvalds 已提交
1018 1019
		goto out;

S
Stephen Smalley 已提交
1020
	cur_enforcing = security_get_bool_value(index);
L
Linus Torvalds 已提交
1021 1022 1023 1024 1025
	if (cur_enforcing < 0) {
		ret = cur_enforcing;
		goto out;
	}
	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
S
Stephen Smalley 已提交
1026
			  bool_pending_values[index]);
1027
	ret = simple_read_from_buffer(buf, count, ppos, page, length);
L
Linus Torvalds 已提交
1028
out:
I
Ingo Molnar 已提交
1029
	mutex_unlock(&sel_mutex);
1030
	free_page((unsigned long)page);
L
Linus Torvalds 已提交
1031 1032 1033 1034 1035 1036 1037
	return ret;
}

static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
			      size_t count, loff_t *ppos)
{
	char *page = NULL;
S
Stephen Smalley 已提交
1038
	ssize_t length;
L
Linus Torvalds 已提交
1039
	int new_value;
S
Stephen Smalley 已提交
1040 1041 1042
	struct inode *inode = filep->f_path.dentry->d_inode;
	unsigned index = inode->i_ino & SEL_INO_MASK;
	const char *name = filep->f_path.dentry->d_name.name;
L
Linus Torvalds 已提交
1043

I
Ingo Molnar 已提交
1044
	mutex_lock(&sel_mutex);
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049

	length = task_has_security(current, SECURITY__SETBOOL);
	if (length)
		goto out;

1050 1051
	length = -EINVAL;
	if (index >= bool_num || strcmp(name, bool_pending_names[index]))
S
Stephen Smalley 已提交
1052 1053
		goto out;

1054 1055
	length = -ENOMEM;
	if (count >= PAGE_SIZE)
L
Linus Torvalds 已提交
1056
		goto out;
S
Stephen Smalley 已提交
1057

1058 1059 1060
	/* No partial writes. */
	length = -EINVAL;
	if (*ppos != 0)
L
Linus Torvalds 已提交
1061
		goto out;
1062 1063

	length = -ENOMEM;
1064
	page = (char *)get_zeroed_page(GFP_KERNEL);
1065
	if (!page)
L
Linus Torvalds 已提交
1066 1067
		goto out;

S
Stephen Smalley 已提交
1068
	length = -EFAULT;
L
Linus Torvalds 已提交
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	if (copy_from_user(page, buf, count))
		goto out;

	length = -EINVAL;
	if (sscanf(page, "%d", &new_value) != 1)
		goto out;

	if (new_value)
		new_value = 1;

S
Stephen Smalley 已提交
1079
	bool_pending_values[index] = new_value;
L
Linus Torvalds 已提交
1080 1081 1082
	length = count;

out:
I
Ingo Molnar 已提交
1083
	mutex_unlock(&sel_mutex);
1084
	free_page((unsigned long) page);
L
Linus Torvalds 已提交
1085 1086 1087
	return length;
}

1088
static const struct file_operations sel_bool_ops = {
1089 1090
	.read		= sel_read_bool,
	.write		= sel_write_bool,
A
Arnd Bergmann 已提交
1091
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
1092 1093 1094 1095 1096 1097 1098
};

static ssize_t sel_commit_bools_write(struct file *filep,
				      const char __user *buf,
				      size_t count, loff_t *ppos)
{
	char *page = NULL;
S
Stephen Smalley 已提交
1099
	ssize_t length;
L
Linus Torvalds 已提交
1100 1101
	int new_value;

I
Ingo Molnar 已提交
1102
	mutex_lock(&sel_mutex);
L
Linus Torvalds 已提交
1103 1104 1105 1106 1107

	length = task_has_security(current, SECURITY__SETBOOL);
	if (length)
		goto out;

1108 1109
	length = -ENOMEM;
	if (count >= PAGE_SIZE)
L
Linus Torvalds 已提交
1110
		goto out;
1111 1112 1113 1114

	/* No partial writes. */
	length = -EINVAL;
	if (*ppos != 0)
L
Linus Torvalds 已提交
1115
		goto out;
1116 1117

	length = -ENOMEM;
1118
	page = (char *)get_zeroed_page(GFP_KERNEL);
1119
	if (!page)
L
Linus Torvalds 已提交
1120 1121
		goto out;

S
Stephen Smalley 已提交
1122
	length = -EFAULT;
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128 1129
	if (copy_from_user(page, buf, count))
		goto out;

	length = -EINVAL;
	if (sscanf(page, "%d", &new_value) != 1)
		goto out;

1130
	length = 0;
1131
	if (new_value && bool_pending_values)
1132
		length = security_set_bools(bool_num, bool_pending_values);
L
Linus Torvalds 已提交
1133

1134 1135
	if (!length)
		length = count;
L
Linus Torvalds 已提交
1136 1137

out:
I
Ingo Molnar 已提交
1138
	mutex_unlock(&sel_mutex);
1139
	free_page((unsigned long) page);
L
Linus Torvalds 已提交
1140 1141 1142
	return length;
}

1143
static const struct file_operations sel_commit_bools_ops = {
1144
	.write		= sel_commit_bools_write,
A
Arnd Bergmann 已提交
1145
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
1146 1147
};

1148
static void sel_remove_entries(struct dentry *de)
L
Linus Torvalds 已提交
1149
{
1150
	struct list_head *node;
L
Linus Torvalds 已提交
1151

N
Nick Piggin 已提交
1152
	spin_lock(&de->d_lock);
L
Linus Torvalds 已提交
1153 1154
	node = de->d_subdirs.next;
	while (node != &de->d_subdirs) {
E
Eric Dumazet 已提交
1155
		struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
N
Nick Piggin 已提交
1156 1157

		spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
L
Linus Torvalds 已提交
1158 1159 1160
		list_del_init(node);

		if (d->d_inode) {
1161
			dget_dlock(d);
N
Nick Piggin 已提交
1162 1163
			spin_unlock(&de->d_lock);
			spin_unlock(&d->d_lock);
L
Linus Torvalds 已提交
1164 1165 1166
			d_delete(d);
			simple_unlink(de->d_inode, d);
			dput(d);
N
Nick Piggin 已提交
1167 1168 1169
			spin_lock(&de->d_lock);
		} else
			spin_unlock(&d->d_lock);
L
Linus Torvalds 已提交
1170 1171 1172
		node = de->d_subdirs.next;
	}

N
Nick Piggin 已提交
1173
	spin_unlock(&de->d_lock);
L
Linus Torvalds 已提交
1174 1175 1176 1177 1178 1179
}

#define BOOL_DIR_NAME "booleans"

static int sel_make_bools(void)
{
1180
	int i, ret;
L
Linus Torvalds 已提交
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
	ssize_t len;
	struct dentry *dentry = NULL;
	struct dentry *dir = bool_dir;
	struct inode *inode = NULL;
	struct inode_security_struct *isec;
	char **names = NULL, *page;
	int num;
	int *values = NULL;
	u32 sid;

	/* remove any existing files */
1192 1193
	for (i = 0; i < bool_num; i++)
		kfree(bool_pending_names[i]);
S
Stephen Smalley 已提交
1194
	kfree(bool_pending_names);
J
Jesper Juhl 已提交
1195
	kfree(bool_pending_values);
S
Stephen Smalley 已提交
1196
	bool_pending_names = NULL;
1197
	bool_pending_values = NULL;
L
Linus Torvalds 已提交
1198

1199
	sel_remove_entries(dir);
L
Linus Torvalds 已提交
1200

1201
	ret = -ENOMEM;
1202 1203
	page = (char *)get_zeroed_page(GFP_KERNEL);
	if (!page)
1204
		goto out;
L
Linus Torvalds 已提交
1205 1206

	ret = security_get_bools(&num, &names, &values);
1207
	if (ret)
L
Linus Torvalds 已提交
1208 1209 1210
		goto out;

	for (i = 0; i < num; i++) {
1211
		ret = -ENOMEM;
L
Linus Torvalds 已提交
1212
		dentry = d_alloc_name(dir, names[i]);
1213 1214 1215 1216
		if (!dentry)
			goto out;

		ret = -ENOMEM;
L
Linus Torvalds 已提交
1217
		inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1218 1219
		if (!inode)
			goto out;
L
Linus Torvalds 已提交
1220

1221
		ret = -EINVAL;
L
Linus Torvalds 已提交
1222
		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1223 1224 1225 1226 1227 1228 1229
		if (len < 0)
			goto out;

		ret = -ENAMETOOLONG;
		if (len >= PAGE_SIZE)
			goto out;

1230 1231 1232
		isec = (struct inode_security_struct *)inode->i_security;
		ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
		if (ret)
1233 1234
			goto out;

L
Linus Torvalds 已提交
1235 1236 1237
		isec->sid = sid;
		isec->initialized = 1;
		inode->i_fop = &sel_bool_ops;
1238
		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
L
Linus Torvalds 已提交
1239 1240 1241
		d_add(dentry, inode);
	}
	bool_num = num;
S
Stephen Smalley 已提交
1242
	bool_pending_names = names;
L
Linus Torvalds 已提交
1243
	bool_pending_values = values;
1244 1245 1246

	free_page((unsigned long)page);
	return 0;
L
Linus Torvalds 已提交
1247 1248
out:
	free_page((unsigned long)page);
1249

L
Linus Torvalds 已提交
1250
	if (names) {
J
Jesper Juhl 已提交
1251 1252
		for (i = 0; i < num; i++)
			kfree(names[i]);
L
Linus Torvalds 已提交
1253 1254
		kfree(names);
	}
1255
	kfree(values);
1256
	sel_remove_entries(dir);
1257 1258

	return ret;
L
Linus Torvalds 已提交
1259 1260 1261 1262
}

#define NULL_FILE_NAME "null"

1263
struct dentry *selinux_null;
L
Linus Torvalds 已提交
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274

static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
					    size_t count, loff_t *ppos)
{
	char tmpbuf[TMPBUFLEN];
	ssize_t length;

	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

1275 1276
static ssize_t sel_write_avc_cache_threshold(struct file *file,
					     const char __user *buf,
L
Linus Torvalds 已提交
1277 1278 1279
					     size_t count, loff_t *ppos)

{
1280
	char *page = NULL;
L
Linus Torvalds 已提交
1281 1282 1283
	ssize_t ret;
	int new_value;

1284 1285
	ret = task_has_security(current, SECURITY__SETSECPARAM);
	if (ret)
L
Linus Torvalds 已提交
1286 1287
		goto out;

1288 1289
	ret = -ENOMEM;
	if (count >= PAGE_SIZE)
L
Linus Torvalds 已提交
1290 1291
		goto out;

1292 1293 1294 1295 1296 1297
	/* No partial writes. */
	ret = -EINVAL;
	if (*ppos != 0)
		goto out;

	ret = -ENOMEM;
1298
	page = (char *)get_zeroed_page(GFP_KERNEL);
1299
	if (!page)
L
Linus Torvalds 已提交
1300 1301
		goto out;

1302 1303 1304
	ret = -EFAULT;
	if (copy_from_user(page, buf, count))
		goto out;
L
Linus Torvalds 已提交
1305

1306 1307
	ret = -EINVAL;
	if (sscanf(page, "%u", &new_value) != 1)
L
Linus Torvalds 已提交
1308 1309
		goto out;

1310 1311
	avc_cache_threshold = new_value;

L
Linus Torvalds 已提交
1312 1313
	ret = count;
out:
1314
	free_page((unsigned long)page);
L
Linus Torvalds 已提交
1315 1316 1317 1318 1319 1320 1321
	return ret;
}

static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
				       size_t count, loff_t *ppos)
{
	char *page;
1322
	ssize_t length;
L
Linus Torvalds 已提交
1323 1324

	page = (char *)__get_free_page(GFP_KERNEL);
1325 1326 1327 1328 1329 1330
	if (!page)
		return -ENOMEM;

	length = avc_get_hash_stats(page);
	if (length >= 0)
		length = simple_read_from_buffer(buf, count, ppos, page, length);
L
Linus Torvalds 已提交
1331
	free_page((unsigned long)page);
1332 1333

	return length;
L
Linus Torvalds 已提交
1334 1335
}

1336
static const struct file_operations sel_avc_cache_threshold_ops = {
L
Linus Torvalds 已提交
1337 1338
	.read		= sel_read_avc_cache_threshold,
	.write		= sel_write_avc_cache_threshold,
A
Arnd Bergmann 已提交
1339
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
1340 1341
};

1342
static const struct file_operations sel_avc_hash_stats_ops = {
L
Linus Torvalds 已提交
1343
	.read		= sel_read_avc_hash_stats,
A
Arnd Bergmann 已提交
1344
	.llseek		= generic_file_llseek,
L
Linus Torvalds 已提交
1345 1346 1347 1348 1349 1350 1351
};

#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
{
	int cpu;

1352
	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
L
Linus Torvalds 已提交
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
		if (!cpu_possible(cpu))
			continue;
		*idx = cpu + 1;
		return &per_cpu(avc_cache_stats, cpu);
	}
	return NULL;
}

static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
{
	loff_t n = *pos - 1;

	if (*pos == 0)
		return SEQ_START_TOKEN;

	return sel_avc_get_stat_idx(&n);
}

static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	return sel_avc_get_stat_idx(pos);
}

static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
{
	struct avc_cache_stats *st = v;

	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "lookups hits misses allocations reclaims "
			   "frees\n");
	else
		seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
			   st->hits, st->misses, st->allocations,
			   st->reclaims, st->frees);
	return 0;
}

static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
{ }

1393
static const struct seq_operations sel_avc_cache_stats_seq_ops = {
L
Linus Torvalds 已提交
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
	.start		= sel_avc_stats_seq_start,
	.next		= sel_avc_stats_seq_next,
	.show		= sel_avc_stats_seq_show,
	.stop		= sel_avc_stats_seq_stop,
};

static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
{
	return seq_open(file, &sel_avc_cache_stats_seq_ops);
}

1405
static const struct file_operations sel_avc_cache_stats_ops = {
L
Linus Torvalds 已提交
1406 1407 1408 1409 1410 1411 1412 1413 1414
	.open		= sel_open_avc_cache_stats,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif

static int sel_make_avc_files(struct dentry *dir)
{
1415
	int i;
L
Linus Torvalds 已提交
1416 1417 1418 1419 1420 1421 1422 1423 1424
	static struct tree_descr files[] = {
		{ "cache_threshold",
		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
#endif
	};

1425
	for (i = 0; i < ARRAY_SIZE(files); i++) {
L
Linus Torvalds 已提交
1426 1427 1428 1429
		struct inode *inode;
		struct dentry *dentry;

		dentry = d_alloc_name(dir, files[i].name);
1430 1431
		if (!dentry)
			return -ENOMEM;
L
Linus Torvalds 已提交
1432 1433

		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1434 1435 1436
		if (!inode)
			return -ENOMEM;

L
Linus Torvalds 已提交
1437
		inode->i_fop = files[i].ops;
1438
		inode->i_ino = ++sel_last_ino;
L
Linus Torvalds 已提交
1439 1440
		d_add(dentry, inode);
	}
1441 1442

	return 0;
L
Linus Torvalds 已提交
1443 1444
}

1445
static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
				size_t count, loff_t *ppos)
{
	struct inode *inode;
	char *con;
	u32 sid, len;
	ssize_t ret;

	inode = file->f_path.dentry->d_inode;
	sid = inode->i_ino&SEL_INO_MASK;
	ret = security_sid_to_context(sid, &con, &len);
1456
	if (ret)
1457 1458 1459 1460 1461 1462 1463 1464 1465
		return ret;

	ret = simple_read_from_buffer(buf, count, ppos, con, len);
	kfree(con);
	return ret;
}

static const struct file_operations sel_initcon_ops = {
	.read		= sel_read_initcon,
A
Arnd Bergmann 已提交
1466
	.llseek		= generic_file_llseek,
1467 1468 1469 1470
};

static int sel_make_initcon_files(struct dentry *dir)
{
1471
	int i;
1472 1473 1474 1475 1476

	for (i = 1; i <= SECINITSID_NUM; i++) {
		struct inode *inode;
		struct dentry *dentry;
		dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1477 1478
		if (!dentry)
			return -ENOMEM;
1479 1480

		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1481 1482 1483
		if (!inode)
			return -ENOMEM;

1484 1485 1486 1487
		inode->i_fop = &sel_initcon_ops;
		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
		d_add(dentry, inode);
	}
1488 1489

	return 0;
1490 1491
}

1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
static inline unsigned int sel_div(unsigned long a, unsigned long b)
{
	return a / b - (a % b < 0);
}

static inline unsigned long sel_class_to_ino(u16 class)
{
	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
}

static inline u16 sel_ino_to_class(unsigned long ino)
{
	return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
}

static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
{
	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
}

static inline u32 sel_ino_to_perm(unsigned long ino)
{
	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
}

1517
static ssize_t sel_read_class(struct file *file, char __user *buf,
1518 1519 1520 1521 1522 1523 1524
				size_t count, loff_t *ppos)
{
	ssize_t rc, len;
	char *page;
	unsigned long ino = file->f_path.dentry->d_inode->i_ino;

	page = (char *)__get_free_page(GFP_KERNEL);
1525 1526
	if (!page)
		return -ENOMEM;
1527 1528 1529 1530

	len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
	rc = simple_read_from_buffer(buf, count, ppos, page, len);
	free_page((unsigned long)page);
1531

1532 1533 1534 1535 1536
	return rc;
}

static const struct file_operations sel_class_ops = {
	.read		= sel_read_class,
A
Arnd Bergmann 已提交
1537
	.llseek		= generic_file_llseek,
1538 1539
};

1540
static ssize_t sel_read_perm(struct file *file, char __user *buf,
1541 1542 1543 1544 1545 1546 1547
				size_t count, loff_t *ppos)
{
	ssize_t rc, len;
	char *page;
	unsigned long ino = file->f_path.dentry->d_inode->i_ino;

	page = (char *)__get_free_page(GFP_KERNEL);
1548 1549
	if (!page)
		return -ENOMEM;
1550

1551
	len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1552 1553
	rc = simple_read_from_buffer(buf, count, ppos, page, len);
	free_page((unsigned long)page);
1554

1555 1556 1557 1558 1559
	return rc;
}

static const struct file_operations sel_perm_ops = {
	.read		= sel_read_perm,
A
Arnd Bergmann 已提交
1560
	.llseek		= generic_file_llseek,
1561 1562
};

1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
static ssize_t sel_read_policycap(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	int value;
	char tmpbuf[TMPBUFLEN];
	ssize_t length;
	unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;

	value = security_policycap_supported(i_ino & SEL_INO_MASK);
	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);

	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}

static const struct file_operations sel_policycap_ops = {
	.read		= sel_read_policycap,
A
Arnd Bergmann 已提交
1579
	.llseek		= generic_file_llseek,
1580 1581
};

1582 1583 1584
static int sel_make_perm_files(char *objclass, int classvalue,
				struct dentry *dir)
{
1585
	int i, rc, nperms;
1586 1587 1588 1589
	char **perms;

	rc = security_get_permissions(objclass, &perms, &nperms);
	if (rc)
1590
		return rc;
1591 1592 1593 1594 1595

	for (i = 0; i < nperms; i++) {
		struct inode *inode;
		struct dentry *dentry;

1596
		rc = -ENOMEM;
1597
		dentry = d_alloc_name(dir, perms[i]);
1598 1599
		if (!dentry)
			goto out;
1600

1601
		rc = -ENOMEM;
1602
		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1603 1604 1605
		if (!inode)
			goto out;

1606 1607
		inode->i_fop = &sel_perm_ops;
		/* i+1 since perm values are 1-indexed */
1608
		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1609 1610
		d_add(dentry, inode);
	}
1611 1612
	rc = 0;
out:
1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
	for (i = 0; i < nperms; i++)
		kfree(perms[i]);
	kfree(perms);
	return rc;
}

static int sel_make_class_dir_entries(char *classname, int index,
					struct dentry *dir)
{
	struct dentry *dentry = NULL;
	struct inode *inode = NULL;
	int rc;

	dentry = d_alloc_name(dir, "index");
1627 1628
	if (!dentry)
		return -ENOMEM;
1629 1630

	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1631 1632
	if (!inode)
		return -ENOMEM;
1633 1634 1635 1636 1637 1638

	inode->i_fop = &sel_class_ops;
	inode->i_ino = sel_class_to_ino(index);
	d_add(dentry, inode);

	dentry = d_alloc_name(dir, "perms");
1639 1640
	if (!dentry)
		return -ENOMEM;
1641 1642 1643

	rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
	if (rc)
1644
		return rc;
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676

	rc = sel_make_perm_files(classname, index, dentry);

	return rc;
}

static void sel_remove_classes(void)
{
	struct list_head *class_node;

	list_for_each(class_node, &class_dir->d_subdirs) {
		struct dentry *class_subdir = list_entry(class_node,
					struct dentry, d_u.d_child);
		struct list_head *class_subdir_node;

		list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
			struct dentry *d = list_entry(class_subdir_node,
						struct dentry, d_u.d_child);

			if (d->d_inode)
				if (d->d_inode->i_mode & S_IFDIR)
					sel_remove_entries(d);
		}

		sel_remove_entries(class_subdir);
	}

	sel_remove_entries(class_dir);
}

static int sel_make_classes(void)
{
1677
	int rc, nclasses, i;
1678 1679 1680 1681 1682 1683
	char **classes;

	/* delete any existing entries */
	sel_remove_classes();

	rc = security_get_classes(&classes, &nclasses);
1684 1685
	if (rc)
		return rc;
1686 1687

	/* +2 since classes are 1-indexed */
1688
	last_class_ino = sel_class_to_ino(nclasses + 2);
1689 1690 1691 1692

	for (i = 0; i < nclasses; i++) {
		struct dentry *class_name_dir;

1693
		rc = -ENOMEM;
1694
		class_name_dir = d_alloc_name(class_dir, classes[i]);
1695 1696
		if (!class_name_dir)
			goto out;
1697 1698 1699 1700

		rc = sel_make_dir(class_dir->d_inode, class_name_dir,
				&last_class_ino);
		if (rc)
1701
			goto out;
1702 1703

		/* i+1 since class values are 1-indexed */
1704
		rc = sel_make_class_dir_entries(classes[i], i + 1,
1705 1706
				class_name_dir);
		if (rc)
1707
			goto out;
1708
	}
1709 1710
	rc = 0;
out:
1711 1712 1713 1714 1715 1716
	for (i = 0; i < nclasses; i++)
		kfree(classes[i]);
	kfree(classes);
	return rc;
}

1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
static int sel_make_policycap(void)
{
	unsigned int iter;
	struct dentry *dentry = NULL;
	struct inode *inode = NULL;

	sel_remove_entries(policycap_dir);

	for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
		if (iter < ARRAY_SIZE(policycap_names))
			dentry = d_alloc_name(policycap_dir,
					      policycap_names[iter]);
		else
			dentry = d_alloc_name(policycap_dir, "unknown");

		if (dentry == NULL)
			return -ENOMEM;

		inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
		if (inode == NULL)
			return -ENOMEM;

		inode->i_fop = &sel_policycap_ops;
		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
		d_add(dentry, inode);
	}

	return 0;
}

1747 1748
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
			unsigned long *ino)
L
Linus Torvalds 已提交
1749 1750 1751
{
	struct inode *inode;

1752
	inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1753 1754 1755
	if (!inode)
		return -ENOMEM;

L
Linus Torvalds 已提交
1756 1757
	inode->i_op = &simple_dir_inode_operations;
	inode->i_fop = &simple_dir_operations;
1758
	inode->i_ino = ++(*ino);
1759
	/* directory inodes start off with i_nlink == 2 (for "." entry) */
1760
	inc_nlink(inode);
L
Linus Torvalds 已提交
1761
	d_add(dentry, inode);
1762
	/* bump link count on parent directory, too */
1763
	inc_nlink(dir);
1764 1765

	return 0;
L
Linus Torvalds 已提交
1766 1767
}

1768
static int sel_fill_super(struct super_block *sb, void *data, int silent)
L
Linus Torvalds 已提交
1769 1770 1771
{
	int ret;
	struct dentry *dentry;
1772
	struct inode *inode, *root_inode;
L
Linus Torvalds 已提交
1773 1774 1775 1776 1777
	struct inode_security_struct *isec;

	static struct tree_descr selinux_files[] = {
		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1778
		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
L
Linus Torvalds 已提交
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788
		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1789 1790
		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1791
		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1792
		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
L
Linus Torvalds 已提交
1793 1794 1795 1796
		/* last one */ {""}
	};
	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
	if (ret)
1797
		goto err;
L
Linus Torvalds 已提交
1798

1799 1800
	root_inode = sb->s_root->d_inode;

1801
	ret = -ENOMEM;
L
Linus Torvalds 已提交
1802
	dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1803
	if (!dentry)
1804
		goto err;
L
Linus Torvalds 已提交
1805

1806
	ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1807
	if (ret)
1808
		goto err;
1809

L
Linus Torvalds 已提交
1810 1811
	bool_dir = dentry;

1812
	ret = -ENOMEM;
L
Linus Torvalds 已提交
1813
	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1814
	if (!dentry)
1815
		goto err;
L
Linus Torvalds 已提交
1816

1817
	ret = -ENOMEM;
L
Linus Torvalds 已提交
1818
	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1819
	if (!inode)
1820
		goto err;
1821

1822
	inode->i_ino = ++sel_last_ino;
1823
	isec = (struct inode_security_struct *)inode->i_security;
L
Linus Torvalds 已提交
1824 1825 1826 1827 1828 1829 1830 1831
	isec->sid = SECINITSID_DEVNULL;
	isec->sclass = SECCLASS_CHR_FILE;
	isec->initialized = 1;

	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
	d_add(dentry, inode);
	selinux_null = dentry;

1832
	ret = -ENOMEM;
L
Linus Torvalds 已提交
1833
	dentry = d_alloc_name(sb->s_root, "avc");
1834
	if (!dentry)
1835
		goto err;
L
Linus Torvalds 已提交
1836

1837
	ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
L
Linus Torvalds 已提交
1838
	if (ret)
1839
		goto err;
L
Linus Torvalds 已提交
1840 1841 1842

	ret = sel_make_avc_files(dentry);
	if (ret)
1843
		goto err;
1844

1845
	ret = -ENOMEM;
1846
	dentry = d_alloc_name(sb->s_root, "initial_contexts");
1847
	if (!dentry)
1848 1849
		goto err;

1850
	ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1851 1852 1853 1854 1855 1856 1857
	if (ret)
		goto err;

	ret = sel_make_initcon_files(dentry);
	if (ret)
		goto err;

1858
	ret = -ENOMEM;
1859
	dentry = d_alloc_name(sb->s_root, "class");
1860
	if (!dentry)
1861 1862 1863 1864 1865 1866 1867 1868
		goto err;

	ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
	if (ret)
		goto err;

	class_dir = dentry;

1869
	ret = -ENOMEM;
1870
	dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1871
	if (!dentry)
1872 1873 1874 1875 1876 1877 1878 1879
		goto err;

	ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
	if (ret)
		goto err;

	policycap_dir = dentry;

1880
	return 0;
1881
err:
E
Eric Paris 已提交
1882 1883
	printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
		__func__);
1884
	return ret;
L
Linus Torvalds 已提交
1885 1886
}

A
Al Viro 已提交
1887 1888
static struct dentry *sel_mount(struct file_system_type *fs_type,
		      int flags, const char *dev_name, void *data)
L
Linus Torvalds 已提交
1889
{
A
Al Viro 已提交
1890
	return mount_single(fs_type, flags, data, sel_fill_super);
L
Linus Torvalds 已提交
1891 1892 1893 1894
}

static struct file_system_type sel_fs_type = {
	.name		= "selinuxfs",
A
Al Viro 已提交
1895
	.mount		= sel_mount,
L
Linus Torvalds 已提交
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907
	.kill_sb	= kill_litter_super,
};

struct vfsmount *selinuxfs_mount;

static int __init init_sel_fs(void)
{
	int err;

	if (!selinux_enabled)
		return 0;
	err = register_filesystem(&sel_fs_type);
1908 1909 1910 1911 1912 1913 1914 1915
	if (err)
		return err;

	selinuxfs_mount = kern_mount(&sel_fs_type);
	if (IS_ERR(selinuxfs_mount)) {
		printk(KERN_ERR "selinuxfs:  could not mount!\n");
		err = PTR_ERR(selinuxfs_mount);
		selinuxfs_mount = NULL;
L
Linus Torvalds 已提交
1916
	}
1917

L
Linus Torvalds 已提交
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928
	return err;
}

__initcall(init_sel_fs);

#ifdef CONFIG_SECURITY_SELINUX_DISABLE
void exit_sel_fs(void)
{
	unregister_filesystem(&sel_fs_type);
}
#endif