1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Implementation of the policy database.
   4 *
   5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
   6 */
   7
   8/*
   9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
  10 *
  11 *	Support for enhanced MLS infrastructure.
  12 *
  13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  14 *
  15 *	Added conditional policy language extensions
  16 *
  17 * Updated: Hewlett-Packard <paul@paul-moore.com>
  18 *
  19 *      Added support for the policy capability bitmap
  20 *
  21 * Update: Mellanox Techonologies
  22 *
  23 *	Added Infiniband support
  24 *
  25 * Copyright (C) 2016 Mellanox Techonologies
  26 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  27 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  28 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  29 */
  30
  31#include <linux/kernel.h>
  32#include <linux/sched.h>
  33#include <linux/slab.h>
  34#include <linux/string.h>
  35#include <linux/errno.h>
  36#include <linux/audit.h>
  37#include "security.h"
  38
  39#include "policydb.h"
  40#include "conditional.h"
  41#include "mls.h"
  42#include "services.h"
  43
  44#define _DEBUG_HASHES
  45
  46#ifdef DEBUG_HASHES
  47static const char *symtab_name[SYM_NUM] = {
  48	"common prefixes",
  49	"classes",
  50	"roles",
  51	"types",
  52	"users",
  53	"bools",
  54	"levels",
  55	"categories",
  56};
  57#endif
  58
  59static unsigned int symtab_sizes[SYM_NUM] = {
  60	2,
  61	32,
  62	16,
  63	512,
  64	128,
  65	16,
  66	16,
  67	16,
  68};
  69
  70struct policydb_compat_info {
  71	int version;
  72	int sym_num;
  73	int ocon_num;
  74};
  75
  76/* These need to be updated if SYM_NUM or OCON_NUM changes */
  77static struct policydb_compat_info policydb_compat[] = {
  78	{
  79		.version	= POLICYDB_VERSION_BASE,
  80		.sym_num	= SYM_NUM - 3,
  81		.ocon_num	= OCON_NUM - 3,
  82	},
  83	{
  84		.version	= POLICYDB_VERSION_BOOL,
  85		.sym_num	= SYM_NUM - 2,
  86		.ocon_num	= OCON_NUM - 3,
  87	},
  88	{
  89		.version	= POLICYDB_VERSION_IPV6,
  90		.sym_num	= SYM_NUM - 2,
  91		.ocon_num	= OCON_NUM - 2,
  92	},
  93	{
  94		.version	= POLICYDB_VERSION_NLCLASS,
  95		.sym_num	= SYM_NUM - 2,
  96		.ocon_num	= OCON_NUM - 2,
  97	},
  98	{
  99		.version	= POLICYDB_VERSION_MLS,
 100		.sym_num	= SYM_NUM,
 101		.ocon_num	= OCON_NUM - 2,
 102	},
 103	{
 104		.version	= POLICYDB_VERSION_AVTAB,
 105		.sym_num	= SYM_NUM,
 106		.ocon_num	= OCON_NUM - 2,
 107	},
 108	{
 109		.version	= POLICYDB_VERSION_RANGETRANS,
 110		.sym_num	= SYM_NUM,
 111		.ocon_num	= OCON_NUM - 2,
 112	},
 113	{
 114		.version	= POLICYDB_VERSION_POLCAP,
 115		.sym_num	= SYM_NUM,
 116		.ocon_num	= OCON_NUM - 2,
 117	},
 118	{
 119		.version	= POLICYDB_VERSION_PERMISSIVE,
 120		.sym_num	= SYM_NUM,
 121		.ocon_num	= OCON_NUM - 2,
 122	},
 123	{
 124		.version	= POLICYDB_VERSION_BOUNDARY,
 125		.sym_num	= SYM_NUM,
 126		.ocon_num	= OCON_NUM - 2,
 127	},
 128	{
 129		.version	= POLICYDB_VERSION_FILENAME_TRANS,
 130		.sym_num	= SYM_NUM,
 131		.ocon_num	= OCON_NUM - 2,
 132	},
 133	{
 134		.version	= POLICYDB_VERSION_ROLETRANS,
 135		.sym_num	= SYM_NUM,
 136		.ocon_num	= OCON_NUM - 2,
 137	},
 138	{
 139		.version	= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 140		.sym_num	= SYM_NUM,
 141		.ocon_num	= OCON_NUM - 2,
 142	},
 143	{
 144		.version	= POLICYDB_VERSION_DEFAULT_TYPE,
 145		.sym_num	= SYM_NUM,
 146		.ocon_num	= OCON_NUM - 2,
 147	},
 148	{
 149		.version	= POLICYDB_VERSION_CONSTRAINT_NAMES,
 150		.sym_num	= SYM_NUM,
 151		.ocon_num	= OCON_NUM - 2,
 152	},
 153	{
 154		.version	= POLICYDB_VERSION_XPERMS_IOCTL,
 155		.sym_num	= SYM_NUM,
 156		.ocon_num	= OCON_NUM - 2,
 157	},
 158	{
 159		.version	= POLICYDB_VERSION_INFINIBAND,
 160		.sym_num	= SYM_NUM,
 161		.ocon_num	= OCON_NUM,
 162	},
 
 
 
 
 
 
 
 
 
 
 163};
 164
 165static struct policydb_compat_info *policydb_lookup_compat(int version)
 166{
 167	int i;
 168	struct policydb_compat_info *info = NULL;
 169
 170	for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 171		if (policydb_compat[i].version == version) {
 172			info = &policydb_compat[i];
 173			break;
 174		}
 175	}
 176	return info;
 
 177}
 178
 179/*
 180 * The following *_destroy functions are used to
 181 * free any memory allocated for each kind of
 182 * symbol data in the policy database.
 183 */
 184
 185static int perm_destroy(void *key, void *datum, void *p)
 186{
 187	kfree(key);
 188	kfree(datum);
 189	return 0;
 190}
 191
 192static int common_destroy(void *key, void *datum, void *p)
 193{
 194	struct common_datum *comdatum;
 195
 196	kfree(key);
 197	if (datum) {
 198		comdatum = datum;
 199		hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 200		hashtab_destroy(comdatum->permissions.table);
 201	}
 202	kfree(datum);
 203	return 0;
 204}
 205
 206static void constraint_expr_destroy(struct constraint_expr *expr)
 207{
 208	if (expr) {
 209		ebitmap_destroy(&expr->names);
 210		if (expr->type_names) {
 211			ebitmap_destroy(&expr->type_names->types);
 212			ebitmap_destroy(&expr->type_names->negset);
 213			kfree(expr->type_names);
 214		}
 215		kfree(expr);
 216	}
 217}
 218
 219static int cls_destroy(void *key, void *datum, void *p)
 220{
 221	struct class_datum *cladatum;
 222	struct constraint_node *constraint, *ctemp;
 223	struct constraint_expr *e, *etmp;
 224
 225	kfree(key);
 226	if (datum) {
 227		cladatum = datum;
 228		hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 229		hashtab_destroy(cladatum->permissions.table);
 230		constraint = cladatum->constraints;
 231		while (constraint) {
 232			e = constraint->expr;
 233			while (e) {
 234				etmp = e;
 235				e = e->next;
 236				constraint_expr_destroy(etmp);
 237			}
 238			ctemp = constraint;
 239			constraint = constraint->next;
 240			kfree(ctemp);
 241		}
 242
 243		constraint = cladatum->validatetrans;
 244		while (constraint) {
 245			e = constraint->expr;
 246			while (e) {
 247				etmp = e;
 248				e = e->next;
 249				constraint_expr_destroy(etmp);
 250			}
 251			ctemp = constraint;
 252			constraint = constraint->next;
 253			kfree(ctemp);
 254		}
 255		kfree(cladatum->comkey);
 256	}
 257	kfree(datum);
 258	return 0;
 259}
 260
 261static int role_destroy(void *key, void *datum, void *p)
 262{
 263	struct role_datum *role;
 264
 265	kfree(key);
 266	if (datum) {
 267		role = datum;
 268		ebitmap_destroy(&role->dominates);
 269		ebitmap_destroy(&role->types);
 270	}
 271	kfree(datum);
 272	return 0;
 273}
 274
 275static int type_destroy(void *key, void *datum, void *p)
 276{
 277	kfree(key);
 278	kfree(datum);
 279	return 0;
 280}
 281
 282static int user_destroy(void *key, void *datum, void *p)
 283{
 284	struct user_datum *usrdatum;
 285
 286	kfree(key);
 287	if (datum) {
 288		usrdatum = datum;
 289		ebitmap_destroy(&usrdatum->roles);
 290		ebitmap_destroy(&usrdatum->range.level[0].cat);
 291		ebitmap_destroy(&usrdatum->range.level[1].cat);
 292		ebitmap_destroy(&usrdatum->dfltlevel.cat);
 293	}
 294	kfree(datum);
 295	return 0;
 296}
 297
 298static int sens_destroy(void *key, void *datum, void *p)
 299{
 300	struct level_datum *levdatum;
 301
 302	kfree(key);
 303	if (datum) {
 304		levdatum = datum;
 305		if (levdatum->level)
 306			ebitmap_destroy(&levdatum->level->cat);
 307		kfree(levdatum->level);
 308	}
 309	kfree(datum);
 310	return 0;
 311}
 312
 313static int cat_destroy(void *key, void *datum, void *p)
 314{
 315	kfree(key);
 316	kfree(datum);
 317	return 0;
 318}
 319
 320static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 321{
 322	common_destroy,
 323	cls_destroy,
 324	role_destroy,
 325	type_destroy,
 326	user_destroy,
 327	cond_destroy_bool,
 328	sens_destroy,
 329	cat_destroy,
 330};
 331
 332static int filenametr_destroy(void *key, void *datum, void *p)
 333{
 334	struct filename_trans *ft = key;
 
 335
 336	kfree(ft->name);
 337	kfree(key);
 338	kfree(datum);
 
 
 
 
 
 339	cond_resched();
 340	return 0;
 341}
 342
 343static int range_tr_destroy(void *key, void *datum, void *p)
 344{
 345	struct mls_range *rt = datum;
 346
 347	kfree(key);
 348	ebitmap_destroy(&rt->level[0].cat);
 349	ebitmap_destroy(&rt->level[1].cat);
 350	kfree(datum);
 351	cond_resched();
 352	return 0;
 353}
 354
 355static void ocontext_destroy(struct ocontext *c, int i)
 
 
 
 
 
 
 
 356{
 357	if (!c)
 358		return;
 359
 360	context_destroy(&c->context[0]);
 361	context_destroy(&c->context[1]);
 362	if (i == OCON_ISID || i == OCON_FS ||
 363	    i == OCON_NETIF || i == OCON_FSUSE)
 364		kfree(c->u.name);
 365	kfree(c);
 366}
 367
 368/*
 369 * Initialize the role table.
 370 */
 371static int roles_init(struct policydb *p)
 372{
 373	char *key = NULL;
 374	int rc;
 375	struct role_datum *role;
 376
 377	role = kzalloc(sizeof(*role), GFP_KERNEL);
 378	if (!role)
 379		return -ENOMEM;
 380
 381	rc = -EINVAL;
 382	role->value = ++p->p_roles.nprim;
 383	if (role->value != OBJECT_R_VAL)
 384		goto out;
 385
 386	rc = -ENOMEM;
 387	key = kstrdup(OBJECT_R, GFP_KERNEL);
 388	if (!key)
 389		goto out;
 390
 391	rc = hashtab_insert(p->p_roles.table, key, role);
 392	if (rc)
 393		goto out;
 394
 395	return 0;
 396out:
 397	kfree(key);
 398	kfree(role);
 399	return rc;
 400}
 401
 402static u32 filenametr_hash(struct hashtab *h, const void *k)
 403{
 404	const struct filename_trans *ft = k;
 405	unsigned long hash;
 406	unsigned int byte_num;
 407	unsigned char focus;
 408
 409	hash = ft->stype ^ ft->ttype ^ ft->tclass;
 410
 411	byte_num = 0;
 412	while ((focus = ft->name[byte_num++]))
 413		hash = partial_name_hash(focus, hash);
 414	return hash & (h->size - 1);
 415}
 416
 417static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 418{
 419	const struct filename_trans *ft1 = k1;
 420	const struct filename_trans *ft2 = k2;
 421	int v;
 422
 423	v = ft1->stype - ft2->stype;
 424	if (v)
 425		return v;
 426
 427	v = ft1->ttype - ft2->ttype;
 428	if (v)
 429		return v;
 430
 431	v = ft1->tclass - ft2->tclass;
 432	if (v)
 433		return v;
 434
 435	return strcmp(ft1->name, ft2->name);
 436
 437}
 438
 439static u32 rangetr_hash(struct hashtab *h, const void *k)
 
 
 
 
 
 
 
 
 
 
 
 440{
 441	const struct range_trans *key = k;
 442
 443	return (key->source_type + (key->target_type << 3) +
 444		(key->target_class << 5)) & (h->size - 1);
 445}
 446
 447static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 448{
 449	const struct range_trans *key1 = k1, *key2 = k2;
 450	int v;
 451
 452	v = key1->source_type - key2->source_type;
 453	if (v)
 454		return v;
 455
 456	v = key1->target_type - key2->target_type;
 457	if (v)
 458		return v;
 459
 460	v = key1->target_class - key2->target_class;
 461
 462	return v;
 463}
 464
 465/*
 466 * Initialize a policy database structure.
 467 */
 468static int policydb_init(struct policydb *p)
 
 
 
 469{
 470	int i, rc;
 
 471
 472	memset(p, 0, sizeof(*p));
 
 
 473
 474	for (i = 0; i < SYM_NUM; i++) {
 475		rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 476		if (rc)
 477			goto out;
 478	}
 479
 480	rc = avtab_init(&p->te_avtab);
 481	if (rc)
 482		goto out;
 
 483
 484	rc = roles_init(p);
 485	if (rc)
 486		goto out;
 487
 488	rc = cond_policydb_init(p);
 489	if (rc)
 490		goto out;
 491
 492	p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp,
 493					   (1 << 10));
 494	if (!p->filename_trans) {
 495		rc = -ENOMEM;
 496		goto out;
 497	}
 498
 499	p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 500	if (!p->range_tr) {
 501		rc = -ENOMEM;
 502		goto out;
 503	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 504
 505	ebitmap_init(&p->filename_trans_ttypes);
 506	ebitmap_init(&p->policycaps);
 507	ebitmap_init(&p->permissive_map);
 508
 509	return 0;
 510out:
 511	hashtab_destroy(p->filename_trans);
 512	hashtab_destroy(p->range_tr);
 513	for (i = 0; i < SYM_NUM; i++) {
 514		hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 515		hashtab_destroy(p->symtab[i].table);
 516	}
 517	return rc;
 518}
 519
 520/*
 521 * The following *_index functions are used to
 522 * define the val_to_name and val_to_struct arrays
 523 * in a policy database structure.  The val_to_name
 524 * arrays are used when converting security context
 525 * structures into string representations.  The
 526 * val_to_struct arrays are used when the attributes
 527 * of a class, role, or user are needed.
 528 */
 529
 530static int common_index(void *key, void *datum, void *datap)
 531{
 532	struct policydb *p;
 533	struct common_datum *comdatum;
 534
 535	comdatum = datum;
 536	p = datap;
 537	if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 538		return -EINVAL;
 539
 540	p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
 541
 542	return 0;
 543}
 544
 545static int class_index(void *key, void *datum, void *datap)
 546{
 547	struct policydb *p;
 548	struct class_datum *cladatum;
 549
 550	cladatum = datum;
 551	p = datap;
 552	if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 553		return -EINVAL;
 554
 555	p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
 556	p->class_val_to_struct[cladatum->value - 1] = cladatum;
 557	return 0;
 558}
 559
 560static int role_index(void *key, void *datum, void *datap)
 561{
 562	struct policydb *p;
 563	struct role_datum *role;
 564
 565	role = datum;
 566	p = datap;
 567	if (!role->value
 568	    || role->value > p->p_roles.nprim
 569	    || role->bounds > p->p_roles.nprim)
 570		return -EINVAL;
 571
 572	p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
 573	p->role_val_to_struct[role->value - 1] = role;
 574	return 0;
 575}
 576
 577static int type_index(void *key, void *datum, void *datap)
 578{
 579	struct policydb *p;
 580	struct type_datum *typdatum;
 581
 582	typdatum = datum;
 583	p = datap;
 584
 585	if (typdatum->primary) {
 586		if (!typdatum->value
 587		    || typdatum->value > p->p_types.nprim
 588		    || typdatum->bounds > p->p_types.nprim)
 589			return -EINVAL;
 590		p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
 591		p->type_val_to_struct[typdatum->value - 1] = typdatum;
 592	}
 593
 594	return 0;
 595}
 596
 597static int user_index(void *key, void *datum, void *datap)
 598{
 599	struct policydb *p;
 600	struct user_datum *usrdatum;
 601
 602	usrdatum = datum;
 603	p = datap;
 604	if (!usrdatum->value
 605	    || usrdatum->value > p->p_users.nprim
 606	    || usrdatum->bounds > p->p_users.nprim)
 607		return -EINVAL;
 608
 609	p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
 610	p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 611	return 0;
 612}
 613
 614static int sens_index(void *key, void *datum, void *datap)
 615{
 616	struct policydb *p;
 617	struct level_datum *levdatum;
 618
 619	levdatum = datum;
 620	p = datap;
 621
 622	if (!levdatum->isalias) {
 623		if (!levdatum->level->sens ||
 624		    levdatum->level->sens > p->p_levels.nprim)
 625			return -EINVAL;
 626
 627		p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
 628	}
 629
 630	return 0;
 631}
 632
 633static int cat_index(void *key, void *datum, void *datap)
 634{
 635	struct policydb *p;
 636	struct cat_datum *catdatum;
 637
 638	catdatum = datum;
 639	p = datap;
 640
 641	if (!catdatum->isalias) {
 642		if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 643			return -EINVAL;
 644
 645		p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
 646	}
 647
 648	return 0;
 649}
 650
 651static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 652{
 653	common_index,
 654	class_index,
 655	role_index,
 656	type_index,
 657	user_index,
 658	cond_index_bool,
 659	sens_index,
 660	cat_index,
 661};
 662
 663#ifdef DEBUG_HASHES
 664static void hash_eval(struct hashtab *h, const char *hash_name)
 665{
 666	struct hashtab_info info;
 667
 668	hashtab_stat(h, &info);
 669	pr_debug("SELinux: %s:  %d entries and %d/%d buckets used, longest chain length %d\n",
 670		 hash_name, h->nel, info.slots_used, h->size,
 671		 info.max_chain_len);
 672}
 673
 674static void symtab_hash_eval(struct symtab *s)
 675{
 676	int i;
 677
 678	for (i = 0; i < SYM_NUM; i++)
 679		hash_eval(s[i].table, symtab_name[i]);
 680}
 681
 682#else
 683static inline void hash_eval(struct hashtab *h, char *hash_name)
 684{
 685}
 686#endif
 
 
 
 687
 688/*
 689 * Define the other val_to_name and val_to_struct arrays
 690 * in a policy database structure.
 691 *
 692 * Caller must clean up on failure.
 693 */
 694static int policydb_index(struct policydb *p)
 695{
 696	int i, rc;
 697
 698	if (p->mls_enabled)
 699		pr_debug("SELinux:  %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
 700			 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 701			 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
 702	else
 703		pr_debug("SELinux:  %d users, %d roles, %d types, %d bools\n",
 704			 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 705			 p->p_bools.nprim);
 706
 707	pr_debug("SELinux:  %d classes, %d rules\n",
 708		 p->p_classes.nprim, p->te_avtab.nel);
 709
 710#ifdef DEBUG_HASHES
 711	avtab_hash_eval(&p->te_avtab, "rules");
 712	symtab_hash_eval(p->symtab);
 713#endif
 714
 715	p->class_val_to_struct = kcalloc(p->p_classes.nprim,
 716					 sizeof(*p->class_val_to_struct),
 717					 GFP_KERNEL);
 718	if (!p->class_val_to_struct)
 719		return -ENOMEM;
 720
 721	p->role_val_to_struct = kcalloc(p->p_roles.nprim,
 722					sizeof(*p->role_val_to_struct),
 723					GFP_KERNEL);
 724	if (!p->role_val_to_struct)
 725		return -ENOMEM;
 726
 727	p->user_val_to_struct = kcalloc(p->p_users.nprim,
 728					sizeof(*p->user_val_to_struct),
 729					GFP_KERNEL);
 730	if (!p->user_val_to_struct)
 731		return -ENOMEM;
 732
 733	p->type_val_to_struct = kvcalloc(p->p_types.nprim,
 734					 sizeof(*p->type_val_to_struct),
 735					 GFP_KERNEL);
 736	if (!p->type_val_to_struct)
 737		return -ENOMEM;
 738
 739	rc = cond_init_bool_indexes(p);
 740	if (rc)
 741		goto out;
 742
 743	for (i = 0; i < SYM_NUM; i++) {
 744		p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
 745						 sizeof(char *),
 746						 GFP_KERNEL);
 747		if (!p->sym_val_to_name[i])
 748			return -ENOMEM;
 749
 750		rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 751		if (rc)
 752			goto out;
 753	}
 754	rc = 0;
 755out:
 756	return rc;
 757}
 758
 759/*
 760 * Free any memory allocated by a policy database structure.
 761 */
 762void policydb_destroy(struct policydb *p)
 763{
 764	struct ocontext *c, *ctmp;
 765	struct genfs *g, *gtmp;
 766	int i;
 767	struct role_allow *ra, *lra = NULL;
 768	struct role_trans *tr, *ltr = NULL;
 769
 770	for (i = 0; i < SYM_NUM; i++) {
 771		cond_resched();
 772		hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 773		hashtab_destroy(p->symtab[i].table);
 774	}
 775
 776	for (i = 0; i < SYM_NUM; i++)
 777		kvfree(p->sym_val_to_name[i]);
 778
 779	kfree(p->class_val_to_struct);
 780	kfree(p->role_val_to_struct);
 781	kfree(p->user_val_to_struct);
 782	kvfree(p->type_val_to_struct);
 783
 784	avtab_destroy(&p->te_avtab);
 785
 786	for (i = 0; i < OCON_NUM; i++) {
 787		cond_resched();
 788		c = p->ocontexts[i];
 789		while (c) {
 790			ctmp = c;
 791			c = c->next;
 792			ocontext_destroy(ctmp, i);
 793		}
 794		p->ocontexts[i] = NULL;
 795	}
 796
 797	g = p->genfs;
 798	while (g) {
 799		cond_resched();
 800		kfree(g->fstype);
 801		c = g->head;
 802		while (c) {
 803			ctmp = c;
 804			c = c->next;
 805			ocontext_destroy(ctmp, OCON_FSUSE);
 806		}
 807		gtmp = g;
 808		g = g->next;
 809		kfree(gtmp);
 810	}
 811	p->genfs = NULL;
 812
 813	cond_policydb_destroy(p);
 814
 815	for (tr = p->role_tr; tr; tr = tr->next) {
 816		cond_resched();
 817		kfree(ltr);
 818		ltr = tr;
 819	}
 820	kfree(ltr);
 821
 822	for (ra = p->role_allow; ra; ra = ra->next) {
 823		cond_resched();
 824		kfree(lra);
 825		lra = ra;
 826	}
 827	kfree(lra);
 828
 829	hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 830	hashtab_destroy(p->filename_trans);
 831
 832	hashtab_map(p->range_tr, range_tr_destroy, NULL);
 833	hashtab_destroy(p->range_tr);
 834
 835	if (p->type_attr_map_array) {
 836		for (i = 0; i < p->p_types.nprim; i++)
 837			ebitmap_destroy(&p->type_attr_map_array[i]);
 838		kvfree(p->type_attr_map_array);
 839	}
 840
 841	ebitmap_destroy(&p->filename_trans_ttypes);
 842	ebitmap_destroy(&p->policycaps);
 843	ebitmap_destroy(&p->permissive_map);
 844}
 845
 846/*
 847 * Load the initial SIDs specified in a policy database
 848 * structure into a SID table.
 849 */
 850int policydb_load_isids(struct policydb *p, struct sidtab *s)
 851{
 852	struct ocontext *head, *c;
 
 
 853	int rc;
 854
 855	rc = sidtab_init(s);
 856	if (rc) {
 857		pr_err("SELinux:  out of memory on SID table init\n");
 858		goto out;
 859	}
 860
 861	head = p->ocontexts[OCON_ISID];
 862	for (c = head; c; c = c->next) {
 863		rc = -EINVAL;
 864		if (!c->context[0].user) {
 865			pr_err("SELinux:  SID %s was never defined.\n",
 866				c->u.name);
 867			sidtab_destroy(s);
 868			goto out;
 869		}
 870		if (c->sid[0] == SECSID_NULL || c->sid[0] > SECINITSID_NUM) {
 871			pr_err("SELinux:  Initial SID %s out of range.\n",
 872				c->u.name);
 873			sidtab_destroy(s);
 874			goto out;
 875		}
 876
 877		rc = sidtab_set_initial(s, c->sid[0], &c->context[0]);
 
 
 
 
 
 
 
 
 
 
 
 878		if (rc) {
 879			pr_err("SELinux:  unable to load initial SID %s.\n",
 880				c->u.name);
 881			sidtab_destroy(s);
 882			goto out;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 883		}
 884	}
 885	rc = 0;
 886out:
 887	return rc;
 888}
 889
 890int policydb_class_isvalid(struct policydb *p, unsigned int class)
 891{
 892	if (!class || class > p->p_classes.nprim)
 893		return 0;
 894	return 1;
 895}
 896
 897int policydb_role_isvalid(struct policydb *p, unsigned int role)
 898{
 899	if (!role || role > p->p_roles.nprim)
 900		return 0;
 901	return 1;
 902}
 903
 904int policydb_type_isvalid(struct policydb *p, unsigned int type)
 905{
 906	if (!type || type > p->p_types.nprim)
 907		return 0;
 908	return 1;
 909}
 910
 911/*
 912 * Return 1 if the fields in the security context
 913 * structure `c' are valid.  Return 0 otherwise.
 914 */
 915int policydb_context_isvalid(struct policydb *p, struct context *c)
 916{
 917	struct role_datum *role;
 918	struct user_datum *usrdatum;
 919
 920	if (!c->role || c->role > p->p_roles.nprim)
 921		return 0;
 922
 923	if (!c->user || c->user > p->p_users.nprim)
 924		return 0;
 925
 926	if (!c->type || c->type > p->p_types.nprim)
 927		return 0;
 928
 929	if (c->role != OBJECT_R_VAL) {
 930		/*
 931		 * Role must be authorized for the type.
 932		 */
 933		role = p->role_val_to_struct[c->role - 1];
 934		if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
 935			/* role may not be associated with type */
 936			return 0;
 937
 938		/*
 939		 * User must be authorized for the role.
 940		 */
 941		usrdatum = p->user_val_to_struct[c->user - 1];
 942		if (!usrdatum)
 943			return 0;
 944
 945		if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 946			/* user may not be associated with role */
 947			return 0;
 948	}
 949
 950	if (!mls_context_isvalid(p, c))
 951		return 0;
 952
 953	return 1;
 954}
 955
 956/*
 957 * Read a MLS range structure from a policydb binary
 958 * representation file.
 959 */
 960static int mls_read_range_helper(struct mls_range *r, void *fp)
 961{
 962	__le32 buf[2];
 963	u32 items;
 964	int rc;
 965
 966	rc = next_entry(buf, fp, sizeof(u32));
 967	if (rc)
 968		goto out;
 969
 970	rc = -EINVAL;
 971	items = le32_to_cpu(buf[0]);
 972	if (items > ARRAY_SIZE(buf)) {
 973		pr_err("SELinux: mls:  range overflow\n");
 974		goto out;
 975	}
 976
 977	rc = next_entry(buf, fp, sizeof(u32) * items);
 978	if (rc) {
 979		pr_err("SELinux: mls:  truncated range\n");
 980		goto out;
 981	}
 982
 983	r->level[0].sens = le32_to_cpu(buf[0]);
 984	if (items > 1)
 985		r->level[1].sens = le32_to_cpu(buf[1]);
 986	else
 987		r->level[1].sens = r->level[0].sens;
 988
 989	rc = ebitmap_read(&r->level[0].cat, fp);
 990	if (rc) {
 991		pr_err("SELinux: mls:  error reading low categories\n");
 992		goto out;
 993	}
 994	if (items > 1) {
 995		rc = ebitmap_read(&r->level[1].cat, fp);
 996		if (rc) {
 997			pr_err("SELinux: mls:  error reading high categories\n");
 998			goto bad_high;
 999		}
1000	} else {
1001		rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1002		if (rc) {
1003			pr_err("SELinux: mls:  out of memory\n");
1004			goto bad_high;
1005		}
1006	}
1007
1008	return 0;
1009bad_high:
1010	ebitmap_destroy(&r->level[0].cat);
1011out:
1012	return rc;
1013}
1014
1015/*
1016 * Read and validate a security context structure
1017 * from a policydb binary representation file.
1018 */
1019static int context_read_and_validate(struct context *c,
1020				     struct policydb *p,
1021				     void *fp)
1022{
1023	__le32 buf[3];
1024	int rc;
1025
1026	rc = next_entry(buf, fp, sizeof buf);
1027	if (rc) {
1028		pr_err("SELinux: context truncated\n");
1029		goto out;
1030	}
1031	c->user = le32_to_cpu(buf[0]);
1032	c->role = le32_to_cpu(buf[1]);
1033	c->type = le32_to_cpu(buf[2]);
1034	if (p->policyvers >= POLICYDB_VERSION_MLS) {
1035		rc = mls_read_range_helper(&c->range, fp);
1036		if (rc) {
1037			pr_err("SELinux: error reading MLS range of context\n");
1038			goto out;
1039		}
1040	}
1041
1042	rc = -EINVAL;
1043	if (!policydb_context_isvalid(p, c)) {
1044		pr_err("SELinux:  invalid security context\n");
1045		context_destroy(c);
1046		goto out;
1047	}
1048	rc = 0;
1049out:
1050	return rc;
1051}
1052
1053/*
1054 * The following *_read functions are used to
1055 * read the symbol data from a policy database
1056 * binary representation file.
1057 */
1058
1059static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1060{
1061	int rc;
1062	char *str;
1063
1064	if ((len == 0) || (len == (u32)-1))
1065		return -EINVAL;
1066
1067	str = kmalloc(len + 1, flags | __GFP_NOWARN);
1068	if (!str)
1069		return -ENOMEM;
1070
1071	/* it's expected the caller should free the str */
1072	*strp = str;
1073
1074	rc = next_entry(str, fp, len);
1075	if (rc)
 
1076		return rc;
 
1077
1078	str[len] = '\0';
 
1079	return 0;
1080}
1081
1082static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1083{
1084	char *key = NULL;
1085	struct perm_datum *perdatum;
1086	int rc;
1087	__le32 buf[2];
1088	u32 len;
1089
1090	perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1091	if (!perdatum)
1092		return -ENOMEM;
1093
1094	rc = next_entry(buf, fp, sizeof buf);
1095	if (rc)
1096		goto bad;
1097
1098	len = le32_to_cpu(buf[0]);
1099	perdatum->value = le32_to_cpu(buf[1]);
1100
1101	rc = str_read(&key, GFP_KERNEL, fp, len);
1102	if (rc)
1103		goto bad;
1104
1105	rc = hashtab_insert(h, key, perdatum);
1106	if (rc)
1107		goto bad;
1108
1109	return 0;
1110bad:
1111	perm_destroy(key, perdatum, NULL);
1112	return rc;
1113}
1114
1115static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1116{
1117	char *key = NULL;
1118	struct common_datum *comdatum;
1119	__le32 buf[4];
1120	u32 len, nel;
1121	int i, rc;
1122
1123	comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1124	if (!comdatum)
1125		return -ENOMEM;
1126
1127	rc = next_entry(buf, fp, sizeof buf);
1128	if (rc)
1129		goto bad;
1130
1131	len = le32_to_cpu(buf[0]);
1132	comdatum->value = le32_to_cpu(buf[1]);
 
1133
1134	rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1135	if (rc)
1136		goto bad;
1137	comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1138	nel = le32_to_cpu(buf[3]);
1139
1140	rc = str_read(&key, GFP_KERNEL, fp, len);
1141	if (rc)
1142		goto bad;
1143
1144	for (i = 0; i < nel; i++) {
1145		rc = perm_read(p, comdatum->permissions.table, fp);
1146		if (rc)
1147			goto bad;
1148	}
1149
1150	rc = hashtab_insert(h, key, comdatum);
1151	if (rc)
1152		goto bad;
1153	return 0;
1154bad:
1155	common_destroy(key, comdatum, NULL);
1156	return rc;
1157}
1158
1159static void type_set_init(struct type_set *t)
1160{
1161	ebitmap_init(&t->types);
1162	ebitmap_init(&t->negset);
1163}
1164
1165static int type_set_read(struct type_set *t, void *fp)
1166{
1167	__le32 buf[1];
1168	int rc;
1169
1170	if (ebitmap_read(&t->types, fp))
1171		return -EINVAL;
1172	if (ebitmap_read(&t->negset, fp))
1173		return -EINVAL;
1174
1175	rc = next_entry(buf, fp, sizeof(u32));
1176	if (rc < 0)
1177		return -EINVAL;
1178	t->flags = le32_to_cpu(buf[0]);
1179
1180	return 0;
1181}
1182
1183
1184static int read_cons_helper(struct policydb *p,
1185				struct constraint_node **nodep,
1186				int ncons, int allowxtarget, void *fp)
1187{
1188	struct constraint_node *c, *lc;
1189	struct constraint_expr *e, *le;
1190	__le32 buf[3];
1191	u32 nexpr;
1192	int rc, i, j, depth;
1193
1194	lc = NULL;
1195	for (i = 0; i < ncons; i++) {
1196		c = kzalloc(sizeof(*c), GFP_KERNEL);
1197		if (!c)
1198			return -ENOMEM;
1199
1200		if (lc)
1201			lc->next = c;
1202		else
1203			*nodep = c;
1204
1205		rc = next_entry(buf, fp, (sizeof(u32) * 2));
1206		if (rc)
1207			return rc;
1208		c->permissions = le32_to_cpu(buf[0]);
1209		nexpr = le32_to_cpu(buf[1]);
1210		le = NULL;
1211		depth = -1;
1212		for (j = 0; j < nexpr; j++) {
1213			e = kzalloc(sizeof(*e), GFP_KERNEL);
1214			if (!e)
1215				return -ENOMEM;
1216
1217			if (le)
1218				le->next = e;
1219			else
1220				c->expr = e;
1221
1222			rc = next_entry(buf, fp, (sizeof(u32) * 3));
1223			if (rc)
1224				return rc;
1225			e->expr_type = le32_to_cpu(buf[0]);
1226			e->attr = le32_to_cpu(buf[1]);
1227			e->op = le32_to_cpu(buf[2]);
1228
1229			switch (e->expr_type) {
1230			case CEXPR_NOT:
1231				if (depth < 0)
1232					return -EINVAL;
1233				break;
1234			case CEXPR_AND:
1235			case CEXPR_OR:
1236				if (depth < 1)
1237					return -EINVAL;
1238				depth--;
1239				break;
1240			case CEXPR_ATTR:
1241				if (depth == (CEXPR_MAXDEPTH - 1))
1242					return -EINVAL;
1243				depth++;
1244				break;
1245			case CEXPR_NAMES:
1246				if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1247					return -EINVAL;
1248				if (depth == (CEXPR_MAXDEPTH - 1))
1249					return -EINVAL;
1250				depth++;
1251				rc = ebitmap_read(&e->names, fp);
1252				if (rc)
1253					return rc;
1254				if (p->policyvers >=
1255					POLICYDB_VERSION_CONSTRAINT_NAMES) {
1256						e->type_names = kzalloc(sizeof
1257						(*e->type_names),
1258						GFP_KERNEL);
1259					if (!e->type_names)
1260						return -ENOMEM;
1261					type_set_init(e->type_names);
1262					rc = type_set_read(e->type_names, fp);
1263					if (rc)
1264						return rc;
1265				}
1266				break;
1267			default:
1268				return -EINVAL;
1269			}
1270			le = e;
1271		}
1272		if (depth != 0)
1273			return -EINVAL;
1274		lc = c;
1275	}
1276
1277	return 0;
1278}
1279
1280static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1281{
1282	char *key = NULL;
1283	struct class_datum *cladatum;
1284	__le32 buf[6];
1285	u32 len, len2, ncons, nel;
1286	int i, rc;
1287
1288	cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1289	if (!cladatum)
1290		return -ENOMEM;
1291
1292	rc = next_entry(buf, fp, sizeof(u32)*6);
1293	if (rc)
1294		goto bad;
1295
1296	len = le32_to_cpu(buf[0]);
1297	len2 = le32_to_cpu(buf[1]);
1298	cladatum->value = le32_to_cpu(buf[2]);
 
1299
1300	rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1301	if (rc)
1302		goto bad;
1303	cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1304	nel = le32_to_cpu(buf[4]);
1305
1306	ncons = le32_to_cpu(buf[5]);
1307
1308	rc = str_read(&key, GFP_KERNEL, fp, len);
1309	if (rc)
1310		goto bad;
1311
1312	if (len2) {
1313		rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1314		if (rc)
1315			goto bad;
1316
1317		rc = -EINVAL;
1318		cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
 
1319		if (!cladatum->comdatum) {
1320			pr_err("SELinux:  unknown common %s\n",
1321			       cladatum->comkey);
1322			goto bad;
1323		}
1324	}
1325	for (i = 0; i < nel; i++) {
1326		rc = perm_read(p, cladatum->permissions.table, fp);
1327		if (rc)
1328			goto bad;
1329	}
1330
1331	rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1332	if (rc)
1333		goto bad;
1334
1335	if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1336		/* grab the validatetrans rules */
1337		rc = next_entry(buf, fp, sizeof(u32));
1338		if (rc)
1339			goto bad;
1340		ncons = le32_to_cpu(buf[0]);
1341		rc = read_cons_helper(p, &cladatum->validatetrans,
1342				ncons, 1, fp);
1343		if (rc)
1344			goto bad;
1345	}
1346
1347	if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1348		rc = next_entry(buf, fp, sizeof(u32) * 3);
1349		if (rc)
1350			goto bad;
1351
1352		cladatum->default_user = le32_to_cpu(buf[0]);
1353		cladatum->default_role = le32_to_cpu(buf[1]);
1354		cladatum->default_range = le32_to_cpu(buf[2]);
1355	}
1356
1357	if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1358		rc = next_entry(buf, fp, sizeof(u32) * 1);
1359		if (rc)
1360			goto bad;
1361		cladatum->default_type = le32_to_cpu(buf[0]);
1362	}
1363
1364	rc = hashtab_insert(h, key, cladatum);
1365	if (rc)
1366		goto bad;
1367
1368	return 0;
1369bad:
1370	cls_destroy(key, cladatum, NULL);
1371	return rc;
1372}
1373
1374static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1375{
1376	char *key = NULL;
1377	struct role_datum *role;
1378	int rc, to_read = 2;
 
1379	__le32 buf[3];
1380	u32 len;
1381
1382	role = kzalloc(sizeof(*role), GFP_KERNEL);
1383	if (!role)
1384		return -ENOMEM;
1385
1386	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1387		to_read = 3;
1388
1389	rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1390	if (rc)
1391		goto bad;
1392
1393	len = le32_to_cpu(buf[0]);
1394	role->value = le32_to_cpu(buf[1]);
1395	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1396		role->bounds = le32_to_cpu(buf[2]);
1397
1398	rc = str_read(&key, GFP_KERNEL, fp, len);
1399	if (rc)
1400		goto bad;
1401
1402	rc = ebitmap_read(&role->dominates, fp);
1403	if (rc)
1404		goto bad;
1405
1406	rc = ebitmap_read(&role->types, fp);
1407	if (rc)
1408		goto bad;
1409
1410	if (strcmp(key, OBJECT_R) == 0) {
1411		rc = -EINVAL;
1412		if (role->value != OBJECT_R_VAL) {
1413			pr_err("SELinux: Role %s has wrong value %d\n",
1414			       OBJECT_R, role->value);
1415			goto bad;
1416		}
1417		rc = 0;
1418		goto bad;
1419	}
1420
1421	rc = hashtab_insert(h, key, role);
1422	if (rc)
1423		goto bad;
1424	return 0;
1425bad:
1426	role_destroy(key, role, NULL);
1427	return rc;
1428}
1429
1430static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1431{
1432	char *key = NULL;
1433	struct type_datum *typdatum;
1434	int rc, to_read = 3;
 
1435	__le32 buf[4];
1436	u32 len;
1437
1438	typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1439	if (!typdatum)
1440		return -ENOMEM;
1441
1442	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1443		to_read = 4;
1444
1445	rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1446	if (rc)
1447		goto bad;
1448
1449	len = le32_to_cpu(buf[0]);
1450	typdatum->value = le32_to_cpu(buf[1]);
1451	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1452		u32 prop = le32_to_cpu(buf[2]);
1453
1454		if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1455			typdatum->primary = 1;
1456		if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1457			typdatum->attribute = 1;
1458
1459		typdatum->bounds = le32_to_cpu(buf[3]);
1460	} else {
1461		typdatum->primary = le32_to_cpu(buf[2]);
1462	}
1463
1464	rc = str_read(&key, GFP_KERNEL, fp, len);
1465	if (rc)
1466		goto bad;
1467
1468	rc = hashtab_insert(h, key, typdatum);
1469	if (rc)
1470		goto bad;
1471	return 0;
1472bad:
1473	type_destroy(key, typdatum, NULL);
1474	return rc;
1475}
1476
1477
1478/*
1479 * Read a MLS level structure from a policydb binary
1480 * representation file.
1481 */
1482static int mls_read_level(struct mls_level *lp, void *fp)
1483{
1484	__le32 buf[1];
1485	int rc;
1486
1487	memset(lp, 0, sizeof(*lp));
1488
1489	rc = next_entry(buf, fp, sizeof buf);
1490	if (rc) {
1491		pr_err("SELinux: mls: truncated level\n");
1492		return rc;
1493	}
1494	lp->sens = le32_to_cpu(buf[0]);
1495
1496	rc = ebitmap_read(&lp->cat, fp);
1497	if (rc) {
1498		pr_err("SELinux: mls:  error reading level categories\n");
1499		return rc;
1500	}
1501	return 0;
1502}
1503
1504static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1505{
1506	char *key = NULL;
1507	struct user_datum *usrdatum;
1508	int rc, to_read = 2;
 
1509	__le32 buf[3];
1510	u32 len;
1511
1512	usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1513	if (!usrdatum)
1514		return -ENOMEM;
1515
1516	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1517		to_read = 3;
1518
1519	rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1520	if (rc)
1521		goto bad;
1522
1523	len = le32_to_cpu(buf[0]);
1524	usrdatum->value = le32_to_cpu(buf[1]);
1525	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1526		usrdatum->bounds = le32_to_cpu(buf[2]);
1527
1528	rc = str_read(&key, GFP_KERNEL, fp, len);
1529	if (rc)
1530		goto bad;
1531
1532	rc = ebitmap_read(&usrdatum->roles, fp);
1533	if (rc)
1534		goto bad;
1535
1536	if (p->policyvers >= POLICYDB_VERSION_MLS) {
1537		rc = mls_read_range_helper(&usrdatum->range, fp);
1538		if (rc)
1539			goto bad;
1540		rc = mls_read_level(&usrdatum->dfltlevel, fp);
1541		if (rc)
1542			goto bad;
1543	}
1544
1545	rc = hashtab_insert(h, key, usrdatum);
1546	if (rc)
1547		goto bad;
1548	return 0;
1549bad:
1550	user_destroy(key, usrdatum, NULL);
1551	return rc;
1552}
1553
1554static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1555{
1556	char *key = NULL;
1557	struct level_datum *levdatum;
1558	int rc;
1559	__le32 buf[2];
1560	u32 len;
1561
1562	levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1563	if (!levdatum)
1564		return -ENOMEM;
1565
1566	rc = next_entry(buf, fp, sizeof buf);
1567	if (rc)
1568		goto bad;
1569
1570	len = le32_to_cpu(buf[0]);
1571	levdatum->isalias = le32_to_cpu(buf[1]);
1572
1573	rc = str_read(&key, GFP_ATOMIC, fp, len);
1574	if (rc)
1575		goto bad;
1576
1577	rc = -ENOMEM;
1578	levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1579	if (!levdatum->level)
1580		goto bad;
1581
1582	rc = mls_read_level(levdatum->level, fp);
1583	if (rc)
1584		goto bad;
1585
1586	rc = hashtab_insert(h, key, levdatum);
1587	if (rc)
1588		goto bad;
1589	return 0;
1590bad:
1591	sens_destroy(key, levdatum, NULL);
1592	return rc;
1593}
1594
1595static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1596{
1597	char *key = NULL;
1598	struct cat_datum *catdatum;
1599	int rc;
1600	__le32 buf[3];
1601	u32 len;
1602
1603	catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1604	if (!catdatum)
1605		return -ENOMEM;
1606
1607	rc = next_entry(buf, fp, sizeof buf);
1608	if (rc)
1609		goto bad;
1610
1611	len = le32_to_cpu(buf[0]);
1612	catdatum->value = le32_to_cpu(buf[1]);
1613	catdatum->isalias = le32_to_cpu(buf[2]);
1614
1615	rc = str_read(&key, GFP_ATOMIC, fp, len);
1616	if (rc)
1617		goto bad;
1618
1619	rc = hashtab_insert(h, key, catdatum);
1620	if (rc)
1621		goto bad;
1622	return 0;
1623bad:
1624	cat_destroy(key, catdatum, NULL);
1625	return rc;
1626}
1627
1628static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1629{
1630	common_read,
1631	class_read,
1632	role_read,
1633	type_read,
1634	user_read,
1635	cond_read_bool,
1636	sens_read,
1637	cat_read,
1638};
1639
1640static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1641{
1642	struct user_datum *upper, *user;
1643	struct policydb *p = datap;
1644	int depth = 0;
1645
1646	upper = user = datum;
1647	while (upper->bounds) {
1648		struct ebitmap_node *node;
1649		unsigned long bit;
1650
1651		if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1652			pr_err("SELinux: user %s: "
1653			       "too deep or looped boundary",
1654			       (char *) key);
1655			return -EINVAL;
1656		}
1657
1658		upper = p->user_val_to_struct[upper->bounds - 1];
1659		ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1660			if (ebitmap_get_bit(&upper->roles, bit))
1661				continue;
1662
1663			pr_err("SELinux: boundary violated policy: "
1664			       "user=%s role=%s bounds=%s\n",
1665			       sym_name(p, SYM_USERS, user->value - 1),
1666			       sym_name(p, SYM_ROLES, bit),
1667			       sym_name(p, SYM_USERS, upper->value - 1));
1668
1669			return -EINVAL;
1670		}
1671	}
1672
1673	return 0;
1674}
1675
1676static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1677{
1678	struct role_datum *upper, *role;
1679	struct policydb *p = datap;
1680	int depth = 0;
1681
1682	upper = role = datum;
1683	while (upper->bounds) {
1684		struct ebitmap_node *node;
1685		unsigned long bit;
1686
1687		if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1688			pr_err("SELinux: role %s: "
1689			       "too deep or looped bounds\n",
1690			       (char *) key);
1691			return -EINVAL;
1692		}
1693
1694		upper = p->role_val_to_struct[upper->bounds - 1];
1695		ebitmap_for_each_positive_bit(&role->types, node, bit) {
1696			if (ebitmap_get_bit(&upper->types, bit))
1697				continue;
1698
1699			pr_err("SELinux: boundary violated policy: "
1700			       "role=%s type=%s bounds=%s\n",
1701			       sym_name(p, SYM_ROLES, role->value - 1),
1702			       sym_name(p, SYM_TYPES, bit),
1703			       sym_name(p, SYM_ROLES, upper->value - 1));
1704
1705			return -EINVAL;
1706		}
1707	}
1708
1709	return 0;
1710}
1711
1712static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1713{
1714	struct type_datum *upper;
1715	struct policydb *p = datap;
1716	int depth = 0;
1717
1718	upper = datum;
1719	while (upper->bounds) {
1720		if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1721			pr_err("SELinux: type %s: "
1722			       "too deep or looped boundary\n",
1723			       (char *) key);
1724			return -EINVAL;
1725		}
1726
1727		upper = p->type_val_to_struct[upper->bounds - 1];
1728		BUG_ON(!upper);
1729
1730		if (upper->attribute) {
1731			pr_err("SELinux: type %s: "
1732			       "bounded by attribute %s",
1733			       (char *) key,
1734			       sym_name(p, SYM_TYPES, upper->value - 1));
1735			return -EINVAL;
1736		}
1737	}
1738
1739	return 0;
1740}
1741
1742static int policydb_bounds_sanity_check(struct policydb *p)
1743{
1744	int rc;
1745
1746	if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1747		return 0;
1748
1749	rc = hashtab_map(p->p_users.table,
1750			 user_bounds_sanity_check, p);
1751	if (rc)
1752		return rc;
1753
1754	rc = hashtab_map(p->p_roles.table,
1755			 role_bounds_sanity_check, p);
1756	if (rc)
1757		return rc;
1758
1759	rc = hashtab_map(p->p_types.table,
1760			 type_bounds_sanity_check, p);
1761	if (rc)
1762		return rc;
1763
1764	return 0;
1765}
1766
1767u16 string_to_security_class(struct policydb *p, const char *name)
1768{
1769	struct class_datum *cladatum;
1770
1771	cladatum = hashtab_search(p->p_classes.table, name);
1772	if (!cladatum)
1773		return 0;
1774
1775	return cladatum->value;
1776}
1777
1778u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1779{
1780	struct class_datum *cladatum;
1781	struct perm_datum *perdatum = NULL;
1782	struct common_datum *comdatum;
1783
1784	if (!tclass || tclass > p->p_classes.nprim)
1785		return 0;
1786
1787	cladatum = p->class_val_to_struct[tclass-1];
1788	comdatum = cladatum->comdatum;
1789	if (comdatum)
1790		perdatum = hashtab_search(comdatum->permissions.table,
1791					  name);
1792	if (!perdatum)
1793		perdatum = hashtab_search(cladatum->permissions.table,
1794					  name);
1795	if (!perdatum)
1796		return 0;
1797
1798	return 1U << (perdatum->value-1);
1799}
1800
1801static int range_read(struct policydb *p, void *fp)
1802{
1803	struct range_trans *rt = NULL;
1804	struct mls_range *r = NULL;
1805	int i, rc;
1806	__le32 buf[2];
1807	u32 nel;
1808
1809	if (p->policyvers < POLICYDB_VERSION_MLS)
1810		return 0;
1811
1812	rc = next_entry(buf, fp, sizeof(u32));
1813	if (rc)
1814		return rc;
1815
1816	nel = le32_to_cpu(buf[0]);
 
 
 
 
 
1817	for (i = 0; i < nel; i++) {
1818		rc = -ENOMEM;
1819		rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1820		if (!rt)
1821			goto out;
1822
1823		rc = next_entry(buf, fp, (sizeof(u32) * 2));
1824		if (rc)
1825			goto out;
1826
1827		rt->source_type = le32_to_cpu(buf[0]);
1828		rt->target_type = le32_to_cpu(buf[1]);
1829		if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1830			rc = next_entry(buf, fp, sizeof(u32));
1831			if (rc)
1832				goto out;
1833			rt->target_class = le32_to_cpu(buf[0]);
1834		} else
1835			rt->target_class = p->process_class;
1836
1837		rc = -EINVAL;
1838		if (!policydb_type_isvalid(p, rt->source_type) ||
1839		    !policydb_type_isvalid(p, rt->target_type) ||
1840		    !policydb_class_isvalid(p, rt->target_class))
1841			goto out;
1842
1843		rc = -ENOMEM;
1844		r = kzalloc(sizeof(*r), GFP_KERNEL);
1845		if (!r)
1846			goto out;
1847
1848		rc = mls_read_range_helper(r, fp);
1849		if (rc)
1850			goto out;
1851
1852		rc = -EINVAL;
1853		if (!mls_range_isvalid(p, r)) {
1854			pr_warn("SELinux:  rangetrans:  invalid range\n");
1855			goto out;
1856		}
1857
1858		rc = hashtab_insert(p->range_tr, rt, r);
1859		if (rc)
1860			goto out;
1861
1862		rt = NULL;
1863		r = NULL;
1864	}
1865	hash_eval(p->range_tr, "rangetr");
1866	rc = 0;
1867out:
1868	kfree(rt);
1869	kfree(r);
1870	return rc;
1871}
1872
1873static int filename_trans_read(struct policydb *p, void *fp)
1874{
1875	struct filename_trans *ft;
1876	struct filename_trans_datum *otype;
1877	char *name;
1878	u32 nel, len;
1879	__le32 buf[4];
1880	int rc, i;
1881
1882	if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1883		return 0;
1884
 
1885	rc = next_entry(buf, fp, sizeof(u32));
1886	if (rc)
1887		return rc;
1888	nel = le32_to_cpu(buf[0]);
1889
1890	for (i = 0; i < nel; i++) {
1891		otype = NULL;
1892		name = NULL;
 
 
 
 
 
1893
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1894		rc = -ENOMEM;
1895		ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1896		if (!ft)
1897			goto out;
1898
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1899		rc = -ENOMEM;
1900		otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1901		if (!otype)
1902			goto out;
1903
1904		/* length of the path component string */
1905		rc = next_entry(buf, fp, sizeof(u32));
 
 
 
1906		if (rc)
1907			goto out;
1908		len = le32_to_cpu(buf[0]);
1909
1910		/* path component string */
1911		rc = str_read(&name, GFP_KERNEL, fp, len);
1912		if (rc)
1913			goto out;
1914
1915		ft->name = name;
1916
1917		rc = next_entry(buf, fp, sizeof(u32) * 4);
1918		if (rc)
1919			goto out;
1920
1921		ft->stype = le32_to_cpu(buf[0]);
1922		ft->ttype = le32_to_cpu(buf[1]);
1923		ft->tclass = le32_to_cpu(buf[2]);
 
1924
1925		otype->otype = le32_to_cpu(buf[3]);
 
 
 
 
 
 
 
 
 
1926
1927		rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1928		if (rc)
1929			goto out;
1930
1931		rc = hashtab_insert(p->filename_trans, ft, otype);
1932		if (rc) {
1933			/*
1934			 * Do not return -EEXIST to the caller, or the system
1935			 * will not boot.
1936			 */
1937			if (rc != -EEXIST)
1938				goto out;
1939			/* But free memory to avoid memory leak. */
1940			kfree(ft);
1941			kfree(name);
1942			kfree(otype);
1943		}
1944	}
1945	hash_eval(p->filename_trans, "filenametr");
1946	return 0;
1947out:
1948	kfree(ft);
1949	kfree(name);
1950	kfree(otype);
 
 
1951
 
 
 
1952	return rc;
1953}
1954
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1955static int genfs_read(struct policydb *p, void *fp)
1956{
1957	int i, j, rc;
1958	u32 nel, nel2, len, len2;
1959	__le32 buf[1];
1960	struct ocontext *l, *c;
1961	struct ocontext *newc = NULL;
1962	struct genfs *genfs_p, *genfs;
1963	struct genfs *newgenfs = NULL;
1964
1965	rc = next_entry(buf, fp, sizeof(u32));
1966	if (rc)
1967		return rc;
1968	nel = le32_to_cpu(buf[0]);
1969
1970	for (i = 0; i < nel; i++) {
1971		rc = next_entry(buf, fp, sizeof(u32));
1972		if (rc)
1973			goto out;
1974		len = le32_to_cpu(buf[0]);
1975
1976		rc = -ENOMEM;
1977		newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1978		if (!newgenfs)
1979			goto out;
1980
1981		rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
1982		if (rc)
1983			goto out;
1984
1985		for (genfs_p = NULL, genfs = p->genfs; genfs;
1986		     genfs_p = genfs, genfs = genfs->next) {
1987			rc = -EINVAL;
1988			if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1989				pr_err("SELinux:  dup genfs fstype %s\n",
1990				       newgenfs->fstype);
1991				goto out;
1992			}
1993			if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1994				break;
1995		}
1996		newgenfs->next = genfs;
1997		if (genfs_p)
1998			genfs_p->next = newgenfs;
1999		else
2000			p->genfs = newgenfs;
2001		genfs = newgenfs;
2002		newgenfs = NULL;
2003
2004		rc = next_entry(buf, fp, sizeof(u32));
2005		if (rc)
2006			goto out;
2007
2008		nel2 = le32_to_cpu(buf[0]);
2009		for (j = 0; j < nel2; j++) {
2010			rc = next_entry(buf, fp, sizeof(u32));
2011			if (rc)
2012				goto out;
2013			len = le32_to_cpu(buf[0]);
2014
2015			rc = -ENOMEM;
2016			newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2017			if (!newc)
2018				goto out;
2019
2020			rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2021			if (rc)
2022				goto out;
2023
2024			rc = next_entry(buf, fp, sizeof(u32));
2025			if (rc)
2026				goto out;
2027
2028			newc->v.sclass = le32_to_cpu(buf[0]);
2029			rc = context_read_and_validate(&newc->context[0], p, fp);
2030			if (rc)
2031				goto out;
2032
2033			for (l = NULL, c = genfs->head; c;
2034			     l = c, c = c->next) {
2035				rc = -EINVAL;
2036				if (!strcmp(newc->u.name, c->u.name) &&
2037				    (!c->v.sclass || !newc->v.sclass ||
2038				     newc->v.sclass == c->v.sclass)) {
2039					pr_err("SELinux:  dup genfs entry (%s,%s)\n",
2040					       genfs->fstype, c->u.name);
2041					goto out;
2042				}
2043				len = strlen(newc->u.name);
2044				len2 = strlen(c->u.name);
2045				if (len > len2)
2046					break;
2047			}
2048
2049			newc->next = c;
2050			if (l)
2051				l->next = newc;
2052			else
2053				genfs->head = newc;
2054			newc = NULL;
2055		}
2056	}
2057	rc = 0;
2058out:
2059	if (newgenfs) {
2060		kfree(newgenfs->fstype);
2061		kfree(newgenfs);
2062	}
2063	ocontext_destroy(newc, OCON_FSUSE);
2064
2065	return rc;
2066}
2067
2068static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2069			 void *fp)
2070{
2071	int i, j, rc;
2072	u32 nel, len;
 
2073	__be64 prefixbuf[1];
2074	__le32 buf[3];
2075	struct ocontext *l, *c;
2076	u32 nodebuf[8];
2077
2078	for (i = 0; i < info->ocon_num; i++) {
2079		rc = next_entry(buf, fp, sizeof(u32));
2080		if (rc)
2081			goto out;
2082		nel = le32_to_cpu(buf[0]);
2083
2084		l = NULL;
2085		for (j = 0; j < nel; j++) {
2086			rc = -ENOMEM;
2087			c = kzalloc(sizeof(*c), GFP_KERNEL);
2088			if (!c)
2089				goto out;
2090			if (l)
2091				l->next = c;
2092			else
2093				p->ocontexts[i] = c;
2094			l = c;
2095
2096			switch (i) {
2097			case OCON_ISID:
2098				rc = next_entry(buf, fp, sizeof(u32));
2099				if (rc)
2100					goto out;
2101
2102				c->sid[0] = le32_to_cpu(buf[0]);
2103				rc = context_read_and_validate(&c->context[0], p, fp);
2104				if (rc)
2105					goto out;
2106				break;
2107			case OCON_FS:
2108			case OCON_NETIF:
2109				rc = next_entry(buf, fp, sizeof(u32));
2110				if (rc)
2111					goto out;
2112				len = le32_to_cpu(buf[0]);
2113
2114				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2115				if (rc)
2116					goto out;
2117
 
 
 
 
2118				rc = context_read_and_validate(&c->context[0], p, fp);
2119				if (rc)
2120					goto out;
2121				rc = context_read_and_validate(&c->context[1], p, fp);
2122				if (rc)
2123					goto out;
2124				break;
2125			case OCON_PORT:
2126				rc = next_entry(buf, fp, sizeof(u32)*3);
2127				if (rc)
2128					goto out;
2129				c->u.port.protocol = le32_to_cpu(buf[0]);
2130				c->u.port.low_port = le32_to_cpu(buf[1]);
2131				c->u.port.high_port = le32_to_cpu(buf[2]);
2132				rc = context_read_and_validate(&c->context[0], p, fp);
2133				if (rc)
2134					goto out;
2135				break;
2136			case OCON_NODE:
2137				rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2138				if (rc)
2139					goto out;
2140				c->u.node.addr = nodebuf[0]; /* network order */
2141				c->u.node.mask = nodebuf[1]; /* network order */
2142				rc = context_read_and_validate(&c->context[0], p, fp);
2143				if (rc)
2144					goto out;
2145				break;
2146			case OCON_FSUSE:
2147				rc = next_entry(buf, fp, sizeof(u32)*2);
2148				if (rc)
2149					goto out;
2150
2151				rc = -EINVAL;
2152				c->v.behavior = le32_to_cpu(buf[0]);
2153				/* Determined at runtime, not in policy DB. */
2154				if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2155					goto out;
2156				if (c->v.behavior > SECURITY_FS_USE_MAX)
2157					goto out;
2158
2159				len = le32_to_cpu(buf[1]);
2160				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2161				if (rc)
2162					goto out;
2163
2164				rc = context_read_and_validate(&c->context[0], p, fp);
2165				if (rc)
2166					goto out;
2167				break;
2168			case OCON_NODE6: {
2169				int k;
2170
2171				rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2172				if (rc)
2173					goto out;
2174				for (k = 0; k < 4; k++)
2175					c->u.node6.addr[k] = nodebuf[k];
2176				for (k = 0; k < 4; k++)
2177					c->u.node6.mask[k] = nodebuf[k+4];
2178				rc = context_read_and_validate(&c->context[0], p, fp);
2179				if (rc)
2180					goto out;
2181				break;
2182			}
2183			case OCON_IBPKEY: {
2184				u32 pkey_lo, pkey_hi;
2185
2186				rc = next_entry(prefixbuf, fp, sizeof(u64));
2187				if (rc)
2188					goto out;
2189
2190				/* we need to have subnet_prefix in CPU order */
2191				c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2192
2193				rc = next_entry(buf, fp, sizeof(u32) * 2);
2194				if (rc)
2195					goto out;
2196
2197				pkey_lo = le32_to_cpu(buf[0]);
2198				pkey_hi = le32_to_cpu(buf[1]);
2199
2200				if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2201					rc = -EINVAL;
2202					goto out;
2203				}
2204
2205				c->u.ibpkey.low_pkey  = pkey_lo;
2206				c->u.ibpkey.high_pkey = pkey_hi;
2207
2208				rc = context_read_and_validate(&c->context[0],
2209							       p,
2210							       fp);
2211				if (rc)
2212					goto out;
2213				break;
2214			}
2215			case OCON_IBENDPORT: {
2216				u32 port;
2217
2218				rc = next_entry(buf, fp, sizeof(u32) * 2);
2219				if (rc)
2220					goto out;
2221				len = le32_to_cpu(buf[0]);
2222
2223				rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2224				if (rc)
2225					goto out;
2226
2227				port = le32_to_cpu(buf[1]);
2228				if (port > U8_MAX || port == 0) {
2229					rc = -EINVAL;
2230					goto out;
2231				}
2232
2233				c->u.ibendport.port = port;
2234
2235				rc = context_read_and_validate(&c->context[0],
2236							       p,
2237							       fp);
2238				if (rc)
2239					goto out;
2240				break;
2241			} /* end case */
2242			} /* end switch */
2243		}
2244	}
2245	rc = 0;
2246out:
2247	return rc;
2248}
2249
2250/*
2251 * Read the configuration data from a policy database binary
2252 * representation file into a policy database structure.
2253 */
2254int policydb_read(struct policydb *p, void *fp)
2255{
2256	struct role_allow *ra, *lra;
2257	struct role_trans *tr, *ltr;
2258	int i, j, rc;
 
2259	__le32 buf[4];
2260	u32 len, nprim, nel;
2261
2262	char *policydb_str;
2263	struct policydb_compat_info *info;
2264
2265	rc = policydb_init(p);
2266	if (rc)
2267		return rc;
2268
2269	/* Read the magic number and string length. */
2270	rc = next_entry(buf, fp, sizeof(u32) * 2);
2271	if (rc)
2272		goto bad;
2273
2274	rc = -EINVAL;
2275	if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2276		pr_err("SELinux:  policydb magic number 0x%x does "
2277		       "not match expected magic number 0x%x\n",
2278		       le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2279		goto bad;
2280	}
2281
2282	rc = -EINVAL;
2283	len = le32_to_cpu(buf[1]);
2284	if (len != strlen(POLICYDB_STRING)) {
2285		pr_err("SELinux:  policydb string length %d does not "
2286		       "match expected length %zu\n",
2287		       len, strlen(POLICYDB_STRING));
2288		goto bad;
2289	}
2290
2291	rc = -ENOMEM;
2292	policydb_str = kmalloc(len + 1, GFP_KERNEL);
2293	if (!policydb_str) {
2294		pr_err("SELinux:  unable to allocate memory for policydb "
2295		       "string of length %d\n", len);
2296		goto bad;
2297	}
2298
2299	rc = next_entry(policydb_str, fp, len);
2300	if (rc) {
2301		pr_err("SELinux:  truncated policydb string identifier\n");
2302		kfree(policydb_str);
2303		goto bad;
2304	}
2305
2306	rc = -EINVAL;
2307	policydb_str[len] = '\0';
2308	if (strcmp(policydb_str, POLICYDB_STRING)) {
2309		pr_err("SELinux:  policydb string %s does not match "
2310		       "my string %s\n", policydb_str, POLICYDB_STRING);
2311		kfree(policydb_str);
2312		goto bad;
2313	}
2314	/* Done with policydb_str. */
2315	kfree(policydb_str);
2316	policydb_str = NULL;
2317
2318	/* Read the version and table sizes. */
2319	rc = next_entry(buf, fp, sizeof(u32)*4);
2320	if (rc)
2321		goto bad;
2322
2323	rc = -EINVAL;
2324	p->policyvers = le32_to_cpu(buf[0]);
2325	if (p->policyvers < POLICYDB_VERSION_MIN ||
2326	    p->policyvers > POLICYDB_VERSION_MAX) {
2327		pr_err("SELinux:  policydb version %d does not match "
2328		       "my version range %d-%d\n",
2329		       le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2330		goto bad;
2331	}
2332
2333	if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2334		p->mls_enabled = 1;
2335
2336		rc = -EINVAL;
2337		if (p->policyvers < POLICYDB_VERSION_MLS) {
2338			pr_err("SELinux: security policydb version %d "
2339				"(MLS) not backwards compatible\n",
2340				p->policyvers);
2341			goto bad;
2342		}
2343	}
2344	p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2345	p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2346
2347	if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2348		rc = ebitmap_read(&p->policycaps, fp);
2349		if (rc)
2350			goto bad;
2351	}
2352
2353	if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2354		rc = ebitmap_read(&p->permissive_map, fp);
2355		if (rc)
2356			goto bad;
2357	}
2358
2359	rc = -EINVAL;
2360	info = policydb_lookup_compat(p->policyvers);
2361	if (!info) {
2362		pr_err("SELinux:  unable to find policy compat info "
2363		       "for version %d\n", p->policyvers);
2364		goto bad;
2365	}
2366
2367	rc = -EINVAL;
2368	if (le32_to_cpu(buf[2]) != info->sym_num ||
2369		le32_to_cpu(buf[3]) != info->ocon_num) {
2370		pr_err("SELinux:  policydb table sizes (%d,%d) do "
2371		       "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2372			le32_to_cpu(buf[3]),
2373		       info->sym_num, info->ocon_num);
2374		goto bad;
2375	}
2376
2377	for (i = 0; i < info->sym_num; i++) {
2378		rc = next_entry(buf, fp, sizeof(u32)*2);
2379		if (rc)
2380			goto bad;
2381		nprim = le32_to_cpu(buf[0]);
2382		nel = le32_to_cpu(buf[1]);
 
 
 
 
 
 
 
 
 
 
 
2383		for (j = 0; j < nel; j++) {
2384			rc = read_f[i](p, p->symtab[i].table, fp);
2385			if (rc)
2386				goto bad;
2387		}
2388
2389		p->symtab[i].nprim = nprim;
2390	}
2391
2392	rc = -EINVAL;
2393	p->process_class = string_to_security_class(p, "process");
2394	if (!p->process_class)
 
2395		goto bad;
 
2396
2397	rc = avtab_read(&p->te_avtab, fp, p);
2398	if (rc)
2399		goto bad;
2400
2401	if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2402		rc = cond_read_list(p, fp);
2403		if (rc)
2404			goto bad;
2405	}
2406
2407	rc = next_entry(buf, fp, sizeof(u32));
2408	if (rc)
2409		goto bad;
2410	nel = le32_to_cpu(buf[0]);
2411	ltr = NULL;
 
 
 
2412	for (i = 0; i < nel; i++) {
2413		rc = -ENOMEM;
2414		tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2415		if (!tr)
2416			goto bad;
2417		if (ltr)
2418			ltr->next = tr;
2419		else
2420			p->role_tr = tr;
 
 
2421		rc = next_entry(buf, fp, sizeof(u32)*3);
2422		if (rc)
2423			goto bad;
2424
2425		rc = -EINVAL;
2426		tr->role = le32_to_cpu(buf[0]);
2427		tr->type = le32_to_cpu(buf[1]);
2428		tr->new_role = le32_to_cpu(buf[2]);
2429		if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2430			rc = next_entry(buf, fp, sizeof(u32));
2431			if (rc)
2432				goto bad;
2433			tr->tclass = le32_to_cpu(buf[0]);
2434		} else
2435			tr->tclass = p->process_class;
2436
2437		rc = -EINVAL;
2438		if (!policydb_role_isvalid(p, tr->role) ||
2439		    !policydb_type_isvalid(p, tr->type) ||
2440		    !policydb_class_isvalid(p, tr->tclass) ||
2441		    !policydb_role_isvalid(p, tr->new_role))
 
 
 
 
2442			goto bad;
2443		ltr = tr;
 
 
2444	}
2445
2446	rc = next_entry(buf, fp, sizeof(u32));
2447	if (rc)
2448		goto bad;
2449	nel = le32_to_cpu(buf[0]);
2450	lra = NULL;
2451	for (i = 0; i < nel; i++) {
2452		rc = -ENOMEM;
2453		ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2454		if (!ra)
2455			goto bad;
2456		if (lra)
2457			lra->next = ra;
2458		else
2459			p->role_allow = ra;
2460		rc = next_entry(buf, fp, sizeof(u32)*2);
2461		if (rc)
2462			goto bad;
2463
2464		rc = -EINVAL;
2465		ra->role = le32_to_cpu(buf[0]);
2466		ra->new_role = le32_to_cpu(buf[1]);
2467		if (!policydb_role_isvalid(p, ra->role) ||
2468		    !policydb_role_isvalid(p, ra->new_role))
2469			goto bad;
2470		lra = ra;
2471	}
2472
2473	rc = filename_trans_read(p, fp);
2474	if (rc)
2475		goto bad;
2476
2477	rc = policydb_index(p);
2478	if (rc)
2479		goto bad;
2480
2481	rc = -EINVAL;
2482	p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2483	p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2484	if (!p->process_trans_perms)
 
 
 
 
 
 
2485		goto bad;
 
 
2486
2487	rc = ocontext_read(p, info, fp);
2488	if (rc)
2489		goto bad;
2490
2491	rc = genfs_read(p, fp);
2492	if (rc)
2493		goto bad;
2494
2495	rc = range_read(p, fp);
2496	if (rc)
2497		goto bad;
2498
 
2499	p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2500					  sizeof(*p->type_attr_map_array),
2501					  GFP_KERNEL);
2502	if (!p->type_attr_map_array)
2503		goto bad;
2504
2505	/* just in case ebitmap_init() becomes more than just a memset(0): */
2506	for (i = 0; i < p->p_types.nprim; i++)
2507		ebitmap_init(&p->type_attr_map_array[i]);
2508
2509	for (i = 0; i < p->p_types.nprim; i++) {
2510		struct ebitmap *e = &p->type_attr_map_array[i];
2511
2512		if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2513			rc = ebitmap_read(e, fp);
2514			if (rc)
2515				goto bad;
2516		}
2517		/* add the type itself as the degenerate case */
2518		rc = ebitmap_set_bit(e, i, 1);
2519		if (rc)
2520			goto bad;
2521	}
2522
2523	rc = policydb_bounds_sanity_check(p);
2524	if (rc)
2525		goto bad;
2526
2527	rc = 0;
2528out:
2529	return rc;
2530bad:
 
 
2531	policydb_destroy(p);
2532	goto out;
2533}
2534
2535/*
2536 * Write a MLS level structure to a policydb binary
2537 * representation file.
2538 */
2539static int mls_write_level(struct mls_level *l, void *fp)
2540{
2541	__le32 buf[1];
2542	int rc;
2543
2544	buf[0] = cpu_to_le32(l->sens);
2545	rc = put_entry(buf, sizeof(u32), 1, fp);
2546	if (rc)
2547		return rc;
2548
2549	rc = ebitmap_write(&l->cat, fp);
2550	if (rc)
2551		return rc;
2552
2553	return 0;
2554}
2555
2556/*
2557 * Write a MLS range structure to a policydb binary
2558 * representation file.
2559 */
2560static int mls_write_range_helper(struct mls_range *r, void *fp)
2561{
2562	__le32 buf[3];
2563	size_t items;
2564	int rc, eq;
2565
2566	eq = mls_level_eq(&r->level[1], &r->level[0]);
2567
2568	if (eq)
2569		items = 2;
2570	else
2571		items = 3;
2572	buf[0] = cpu_to_le32(items-1);
2573	buf[1] = cpu_to_le32(r->level[0].sens);
2574	if (!eq)
2575		buf[2] = cpu_to_le32(r->level[1].sens);
2576
2577	BUG_ON(items > ARRAY_SIZE(buf));
2578
2579	rc = put_entry(buf, sizeof(u32), items, fp);
2580	if (rc)
2581		return rc;
2582
2583	rc = ebitmap_write(&r->level[0].cat, fp);
2584	if (rc)
2585		return rc;
2586	if (!eq) {
2587		rc = ebitmap_write(&r->level[1].cat, fp);
2588		if (rc)
2589			return rc;
2590	}
2591
2592	return 0;
2593}
2594
2595static int sens_write(void *vkey, void *datum, void *ptr)
2596{
2597	char *key = vkey;
2598	struct level_datum *levdatum = datum;
2599	struct policy_data *pd = ptr;
2600	void *fp = pd->fp;
2601	__le32 buf[2];
2602	size_t len;
2603	int rc;
2604
2605	len = strlen(key);
2606	buf[0] = cpu_to_le32(len);
2607	buf[1] = cpu_to_le32(levdatum->isalias);
2608	rc = put_entry(buf, sizeof(u32), 2, fp);
2609	if (rc)
2610		return rc;
2611
2612	rc = put_entry(key, 1, len, fp);
2613	if (rc)
2614		return rc;
2615
2616	rc = mls_write_level(levdatum->level, fp);
2617	if (rc)
2618		return rc;
2619
2620	return 0;
2621}
2622
2623static int cat_write(void *vkey, void *datum, void *ptr)
2624{
2625	char *key = vkey;
2626	struct cat_datum *catdatum = datum;
2627	struct policy_data *pd = ptr;
2628	void *fp = pd->fp;
2629	__le32 buf[3];
2630	size_t len;
2631	int rc;
2632
2633	len = strlen(key);
2634	buf[0] = cpu_to_le32(len);
2635	buf[1] = cpu_to_le32(catdatum->value);
2636	buf[2] = cpu_to_le32(catdatum->isalias);
2637	rc = put_entry(buf, sizeof(u32), 3, fp);
2638	if (rc)
2639		return rc;
2640
2641	rc = put_entry(key, 1, len, fp);
2642	if (rc)
2643		return rc;
2644
2645	return 0;
2646}
2647
2648static int role_trans_write(struct policydb *p, void *fp)
2649{
2650	struct role_trans *r = p->role_tr;
2651	struct role_trans *tr;
2652	u32 buf[3];
2653	size_t nel;
 
 
2654	int rc;
2655
2656	nel = 0;
2657	for (tr = r; tr; tr = tr->next)
2658		nel++;
2659	buf[0] = cpu_to_le32(nel);
2660	rc = put_entry(buf, sizeof(u32), 1, fp);
2661	if (rc)
2662		return rc;
2663	for (tr = r; tr; tr = tr->next) {
2664		buf[0] = cpu_to_le32(tr->role);
2665		buf[1] = cpu_to_le32(tr->type);
2666		buf[2] = cpu_to_le32(tr->new_role);
2667		rc = put_entry(buf, sizeof(u32), 3, fp);
2668		if (rc)
2669			return rc;
2670		if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2671			buf[0] = cpu_to_le32(tr->tclass);
2672			rc = put_entry(buf, sizeof(u32), 1, fp);
2673			if (rc)
2674				return rc;
2675		}
2676	}
2677
2678	return 0;
2679}
2680
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2681static int role_allow_write(struct role_allow *r, void *fp)
2682{
2683	struct role_allow *ra;
2684	u32 buf[2];
2685	size_t nel;
2686	int rc;
2687
2688	nel = 0;
2689	for (ra = r; ra; ra = ra->next)
2690		nel++;
2691	buf[0] = cpu_to_le32(nel);
2692	rc = put_entry(buf, sizeof(u32), 1, fp);
2693	if (rc)
2694		return rc;
2695	for (ra = r; ra; ra = ra->next) {
2696		buf[0] = cpu_to_le32(ra->role);
2697		buf[1] = cpu_to_le32(ra->new_role);
2698		rc = put_entry(buf, sizeof(u32), 2, fp);
2699		if (rc)
2700			return rc;
2701	}
2702	return 0;
2703}
2704
2705/*
2706 * Write a security context structure
2707 * to a policydb binary representation file.
2708 */
2709static int context_write(struct policydb *p, struct context *c,
2710			 void *fp)
2711{
2712	int rc;
2713	__le32 buf[3];
2714
2715	buf[0] = cpu_to_le32(c->user);
2716	buf[1] = cpu_to_le32(c->role);
2717	buf[2] = cpu_to_le32(c->type);
2718
2719	rc = put_entry(buf, sizeof(u32), 3, fp);
2720	if (rc)
2721		return rc;
2722
2723	rc = mls_write_range_helper(&c->range, fp);
2724	if (rc)
2725		return rc;
2726
2727	return 0;
2728}
2729
2730/*
2731 * The following *_write functions are used to
2732 * write the symbol data to a policy database
2733 * binary representation file.
2734 */
2735
2736static int perm_write(void *vkey, void *datum, void *fp)
2737{
2738	char *key = vkey;
2739	struct perm_datum *perdatum = datum;
2740	__le32 buf[2];
2741	size_t len;
2742	int rc;
2743
2744	len = strlen(key);
2745	buf[0] = cpu_to_le32(len);
2746	buf[1] = cpu_to_le32(perdatum->value);
2747	rc = put_entry(buf, sizeof(u32), 2, fp);
2748	if (rc)
2749		return rc;
2750
2751	rc = put_entry(key, 1, len, fp);
2752	if (rc)
2753		return rc;
2754
2755	return 0;
2756}
2757
2758static int common_write(void *vkey, void *datum, void *ptr)
2759{
2760	char *key = vkey;
2761	struct common_datum *comdatum = datum;
2762	struct policy_data *pd = ptr;
2763	void *fp = pd->fp;
2764	__le32 buf[4];
2765	size_t len;
2766	int rc;
2767
2768	len = strlen(key);
2769	buf[0] = cpu_to_le32(len);
2770	buf[1] = cpu_to_le32(comdatum->value);
2771	buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2772	buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2773	rc = put_entry(buf, sizeof(u32), 4, fp);
2774	if (rc)
2775		return rc;
2776
2777	rc = put_entry(key, 1, len, fp);
2778	if (rc)
2779		return rc;
2780
2781	rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2782	if (rc)
2783		return rc;
2784
2785	return 0;
2786}
2787
2788static int type_set_write(struct type_set *t, void *fp)
2789{
2790	int rc;
2791	__le32 buf[1];
2792
2793	if (ebitmap_write(&t->types, fp))
2794		return -EINVAL;
2795	if (ebitmap_write(&t->negset, fp))
2796		return -EINVAL;
2797
2798	buf[0] = cpu_to_le32(t->flags);
2799	rc = put_entry(buf, sizeof(u32), 1, fp);
2800	if (rc)
2801		return -EINVAL;
2802
2803	return 0;
2804}
2805
2806static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2807			     void *fp)
2808{
2809	struct constraint_node *c;
2810	struct constraint_expr *e;
2811	__le32 buf[3];
2812	u32 nel;
2813	int rc;
2814
2815	for (c = node; c; c = c->next) {
2816		nel = 0;
2817		for (e = c->expr; e; e = e->next)
2818			nel++;
2819		buf[0] = cpu_to_le32(c->permissions);
2820		buf[1] = cpu_to_le32(nel);
2821		rc = put_entry(buf, sizeof(u32), 2, fp);
2822		if (rc)
2823			return rc;
2824		for (e = c->expr; e; e = e->next) {
2825			buf[0] = cpu_to_le32(e->expr_type);
2826			buf[1] = cpu_to_le32(e->attr);
2827			buf[2] = cpu_to_le32(e->op);
2828			rc = put_entry(buf, sizeof(u32), 3, fp);
2829			if (rc)
2830				return rc;
2831
2832			switch (e->expr_type) {
2833			case CEXPR_NAMES:
2834				rc = ebitmap_write(&e->names, fp);
2835				if (rc)
2836					return rc;
2837				if (p->policyvers >=
2838					POLICYDB_VERSION_CONSTRAINT_NAMES) {
2839					rc = type_set_write(e->type_names, fp);
2840					if (rc)
2841						return rc;
2842				}
2843				break;
2844			default:
2845				break;
2846			}
2847		}
2848	}
2849
2850	return 0;
2851}
2852
2853static int class_write(void *vkey, void *datum, void *ptr)
2854{
2855	char *key = vkey;
2856	struct class_datum *cladatum = datum;
2857	struct policy_data *pd = ptr;
2858	void *fp = pd->fp;
2859	struct policydb *p = pd->p;
2860	struct constraint_node *c;
2861	__le32 buf[6];
2862	u32 ncons;
2863	size_t len, len2;
2864	int rc;
2865
2866	len = strlen(key);
2867	if (cladatum->comkey)
2868		len2 = strlen(cladatum->comkey);
2869	else
2870		len2 = 0;
2871
2872	ncons = 0;
2873	for (c = cladatum->constraints; c; c = c->next)
2874		ncons++;
2875
2876	buf[0] = cpu_to_le32(len);
2877	buf[1] = cpu_to_le32(len2);
2878	buf[2] = cpu_to_le32(cladatum->value);
2879	buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2880	if (cladatum->permissions.table)
2881		buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2882	else
2883		buf[4] = 0;
2884	buf[5] = cpu_to_le32(ncons);
2885	rc = put_entry(buf, sizeof(u32), 6, fp);
2886	if (rc)
2887		return rc;
2888
2889	rc = put_entry(key, 1, len, fp);
2890	if (rc)
2891		return rc;
2892
2893	if (cladatum->comkey) {
2894		rc = put_entry(cladatum->comkey, 1, len2, fp);
2895		if (rc)
2896			return rc;
2897	}
2898
2899	rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2900	if (rc)
2901		return rc;
2902
2903	rc = write_cons_helper(p, cladatum->constraints, fp);
2904	if (rc)
2905		return rc;
2906
2907	/* write out the validatetrans rule */
2908	ncons = 0;
2909	for (c = cladatum->validatetrans; c; c = c->next)
2910		ncons++;
2911
2912	buf[0] = cpu_to_le32(ncons);
2913	rc = put_entry(buf, sizeof(u32), 1, fp);
2914	if (rc)
2915		return rc;
2916
2917	rc = write_cons_helper(p, cladatum->validatetrans, fp);
2918	if (rc)
2919		return rc;
2920
2921	if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2922		buf[0] = cpu_to_le32(cladatum->default_user);
2923		buf[1] = cpu_to_le32(cladatum->default_role);
2924		buf[2] = cpu_to_le32(cladatum->default_range);
2925
2926		rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2927		if (rc)
2928			return rc;
2929	}
2930
2931	if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2932		buf[0] = cpu_to_le32(cladatum->default_type);
2933		rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2934		if (rc)
2935			return rc;
2936	}
2937
2938	return 0;
2939}
2940
2941static int role_write(void *vkey, void *datum, void *ptr)
2942{
2943	char *key = vkey;
2944	struct role_datum *role = datum;
2945	struct policy_data *pd = ptr;
2946	void *fp = pd->fp;
2947	struct policydb *p = pd->p;
2948	__le32 buf[3];
2949	size_t items, len;
2950	int rc;
2951
2952	len = strlen(key);
2953	items = 0;
2954	buf[items++] = cpu_to_le32(len);
2955	buf[items++] = cpu_to_le32(role->value);
2956	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2957		buf[items++] = cpu_to_le32(role->bounds);
2958
2959	BUG_ON(items > ARRAY_SIZE(buf));
2960
2961	rc = put_entry(buf, sizeof(u32), items, fp);
2962	if (rc)
2963		return rc;
2964
2965	rc = put_entry(key, 1, len, fp);
2966	if (rc)
2967		return rc;
2968
2969	rc = ebitmap_write(&role->dominates, fp);
2970	if (rc)
2971		return rc;
2972
2973	rc = ebitmap_write(&role->types, fp);
2974	if (rc)
2975		return rc;
2976
2977	return 0;
2978}
2979
2980static int type_write(void *vkey, void *datum, void *ptr)
2981{
2982	char *key = vkey;
2983	struct type_datum *typdatum = datum;
2984	struct policy_data *pd = ptr;
2985	struct policydb *p = pd->p;
2986	void *fp = pd->fp;
2987	__le32 buf[4];
2988	int rc;
2989	size_t items, len;
2990
2991	len = strlen(key);
2992	items = 0;
2993	buf[items++] = cpu_to_le32(len);
2994	buf[items++] = cpu_to_le32(typdatum->value);
2995	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2996		u32 properties = 0;
2997
2998		if (typdatum->primary)
2999			properties |= TYPEDATUM_PROPERTY_PRIMARY;
3000
3001		if (typdatum->attribute)
3002			properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3003
3004		buf[items++] = cpu_to_le32(properties);
3005		buf[items++] = cpu_to_le32(typdatum->bounds);
3006	} else {
3007		buf[items++] = cpu_to_le32(typdatum->primary);
3008	}
3009	BUG_ON(items > ARRAY_SIZE(buf));
3010	rc = put_entry(buf, sizeof(u32), items, fp);
3011	if (rc)
3012		return rc;
3013
3014	rc = put_entry(key, 1, len, fp);
3015	if (rc)
3016		return rc;
3017
3018	return 0;
3019}
3020
3021static int user_write(void *vkey, void *datum, void *ptr)
3022{
3023	char *key = vkey;
3024	struct user_datum *usrdatum = datum;
3025	struct policy_data *pd = ptr;
3026	struct policydb *p = pd->p;
3027	void *fp = pd->fp;
3028	__le32 buf[3];
3029	size_t items, len;
3030	int rc;
3031
3032	len = strlen(key);
3033	items = 0;
3034	buf[items++] = cpu_to_le32(len);
3035	buf[items++] = cpu_to_le32(usrdatum->value);
3036	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3037		buf[items++] = cpu_to_le32(usrdatum->bounds);
3038	BUG_ON(items > ARRAY_SIZE(buf));
3039	rc = put_entry(buf, sizeof(u32), items, fp);
3040	if (rc)
3041		return rc;
3042
3043	rc = put_entry(key, 1, len, fp);
3044	if (rc)
3045		return rc;
3046
3047	rc = ebitmap_write(&usrdatum->roles, fp);
3048	if (rc)
3049		return rc;
3050
3051	rc = mls_write_range_helper(&usrdatum->range, fp);
3052	if (rc)
3053		return rc;
3054
3055	rc = mls_write_level(&usrdatum->dfltlevel, fp);
3056	if (rc)
3057		return rc;
3058
3059	return 0;
3060}
3061
3062static int (*write_f[SYM_NUM]) (void *key, void *datum,
3063				void *datap) =
3064{
3065	common_write,
3066	class_write,
3067	role_write,
3068	type_write,
3069	user_write,
3070	cond_write_bool,
3071	sens_write,
3072	cat_write,
3073};
3074
3075static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3076			  void *fp)
3077{
3078	unsigned int i, j, rc;
 
3079	size_t nel, len;
3080	__be64 prefixbuf[1];
3081	__le32 buf[3];
3082	u32 nodebuf[8];
3083	struct ocontext *c;
3084	for (i = 0; i < info->ocon_num; i++) {
3085		nel = 0;
3086		for (c = p->ocontexts[i]; c; c = c->next)
3087			nel++;
3088		buf[0] = cpu_to_le32(nel);
3089		rc = put_entry(buf, sizeof(u32), 1, fp);
3090		if (rc)
3091			return rc;
3092		for (c = p->ocontexts[i]; c; c = c->next) {
3093			switch (i) {
3094			case OCON_ISID:
3095				buf[0] = cpu_to_le32(c->sid[0]);
3096				rc = put_entry(buf, sizeof(u32), 1, fp);
3097				if (rc)
3098					return rc;
3099				rc = context_write(p, &c->context[0], fp);
3100				if (rc)
3101					return rc;
3102				break;
3103			case OCON_FS:
3104			case OCON_NETIF:
3105				len = strlen(c->u.name);
3106				buf[0] = cpu_to_le32(len);
3107				rc = put_entry(buf, sizeof(u32), 1, fp);
3108				if (rc)
3109					return rc;
3110				rc = put_entry(c->u.name, 1, len, fp);
3111				if (rc)
3112					return rc;
3113				rc = context_write(p, &c->context[0], fp);
3114				if (rc)
3115					return rc;
3116				rc = context_write(p, &c->context[1], fp);
3117				if (rc)
3118					return rc;
3119				break;
3120			case OCON_PORT:
3121				buf[0] = cpu_to_le32(c->u.port.protocol);
3122				buf[1] = cpu_to_le32(c->u.port.low_port);
3123				buf[2] = cpu_to_le32(c->u.port.high_port);
3124				rc = put_entry(buf, sizeof(u32), 3, fp);
3125				if (rc)
3126					return rc;
3127				rc = context_write(p, &c->context[0], fp);
3128				if (rc)
3129					return rc;
3130				break;
3131			case OCON_NODE:
3132				nodebuf[0] = c->u.node.addr; /* network order */
3133				nodebuf[1] = c->u.node.mask; /* network order */
3134				rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3135				if (rc)
3136					return rc;
3137				rc = context_write(p, &c->context[0], fp);
3138				if (rc)
3139					return rc;
3140				break;
3141			case OCON_FSUSE:
3142				buf[0] = cpu_to_le32(c->v.behavior);
3143				len = strlen(c->u.name);
3144				buf[1] = cpu_to_le32(len);
3145				rc = put_entry(buf, sizeof(u32), 2, fp);
3146				if (rc)
3147					return rc;
3148				rc = put_entry(c->u.name, 1, len, fp);
3149				if (rc)
3150					return rc;
3151				rc = context_write(p, &c->context[0], fp);
3152				if (rc)
3153					return rc;
3154				break;
3155			case OCON_NODE6:
3156				for (j = 0; j < 4; j++)
3157					nodebuf[j] = c->u.node6.addr[j]; /* network order */
3158				for (j = 0; j < 4; j++)
3159					nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3160				rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3161				if (rc)
3162					return rc;
3163				rc = context_write(p, &c->context[0], fp);
3164				if (rc)
3165					return rc;
3166				break;
3167			case OCON_IBPKEY:
3168				/* subnet_prefix is in CPU order */
3169				prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3170
3171				rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3172				if (rc)
3173					return rc;
3174
3175				buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3176				buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3177
3178				rc = put_entry(buf, sizeof(u32), 2, fp);
3179				if (rc)
3180					return rc;
3181				rc = context_write(p, &c->context[0], fp);
3182				if (rc)
3183					return rc;
3184				break;
3185			case OCON_IBENDPORT:
3186				len = strlen(c->u.ibendport.dev_name);
3187				buf[0] = cpu_to_le32(len);
3188				buf[1] = cpu_to_le32(c->u.ibendport.port);
3189				rc = put_entry(buf, sizeof(u32), 2, fp);
3190				if (rc)
3191					return rc;
3192				rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3193				if (rc)
3194					return rc;
3195				rc = context_write(p, &c->context[0], fp);
3196				if (rc)
3197					return rc;
3198				break;
3199			}
3200		}
3201	}
3202	return 0;
3203}
3204
3205static int genfs_write(struct policydb *p, void *fp)
3206{
3207	struct genfs *genfs;
3208	struct ocontext *c;
3209	size_t len;
3210	__le32 buf[1];
3211	int rc;
3212
3213	len = 0;
3214	for (genfs = p->genfs; genfs; genfs = genfs->next)
3215		len++;
3216	buf[0] = cpu_to_le32(len);
3217	rc = put_entry(buf, sizeof(u32), 1, fp);
3218	if (rc)
3219		return rc;
3220	for (genfs = p->genfs; genfs; genfs = genfs->next) {
3221		len = strlen(genfs->fstype);
3222		buf[0] = cpu_to_le32(len);
3223		rc = put_entry(buf, sizeof(u32), 1, fp);
3224		if (rc)
3225			return rc;
3226		rc = put_entry(genfs->fstype, 1, len, fp);
3227		if (rc)
3228			return rc;
3229		len = 0;
3230		for (c = genfs->head; c; c = c->next)
3231			len++;
3232		buf[0] = cpu_to_le32(len);
3233		rc = put_entry(buf, sizeof(u32), 1, fp);
3234		if (rc)
3235			return rc;
3236		for (c = genfs->head; c; c = c->next) {
3237			len = strlen(c->u.name);
3238			buf[0] = cpu_to_le32(len);
3239			rc = put_entry(buf, sizeof(u32), 1, fp);
3240			if (rc)
3241				return rc;
3242			rc = put_entry(c->u.name, 1, len, fp);
3243			if (rc)
3244				return rc;
3245			buf[0] = cpu_to_le32(c->v.sclass);
3246			rc = put_entry(buf, sizeof(u32), 1, fp);
3247			if (rc)
3248				return rc;
3249			rc = context_write(p, &c->context[0], fp);
3250			if (rc)
3251				return rc;
3252		}
3253	}
3254	return 0;
3255}
3256
3257static int hashtab_cnt(void *key, void *data, void *ptr)
3258{
3259	int *cnt = ptr;
3260	*cnt = *cnt + 1;
3261
3262	return 0;
3263}
3264
3265static int range_write_helper(void *key, void *data, void *ptr)
3266{
3267	__le32 buf[2];
3268	struct range_trans *rt = key;
3269	struct mls_range *r = data;
3270	struct policy_data *pd = ptr;
3271	void *fp = pd->fp;
3272	struct policydb *p = pd->p;
3273	int rc;
3274
3275	buf[0] = cpu_to_le32(rt->source_type);
3276	buf[1] = cpu_to_le32(rt->target_type);
3277	rc = put_entry(buf, sizeof(u32), 2, fp);
3278	if (rc)
3279		return rc;
3280	if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3281		buf[0] = cpu_to_le32(rt->target_class);
3282		rc = put_entry(buf, sizeof(u32), 1, fp);
3283		if (rc)
3284			return rc;
3285	}
3286	rc = mls_write_range_helper(r, fp);
3287	if (rc)
3288		return rc;
3289
3290	return 0;
3291}
3292
3293static int range_write(struct policydb *p, void *fp)
3294{
3295	__le32 buf[1];
3296	int rc, nel;
3297	struct policy_data pd;
3298
3299	pd.p = p;
3300	pd.fp = fp;
3301
3302	/* count the number of entries in the hashtab */
3303	nel = 0;
3304	rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3305	if (rc)
3306		return rc;
3307
3308	buf[0] = cpu_to_le32(nel);
3309	rc = put_entry(buf, sizeof(u32), 1, fp);
3310	if (rc)
3311		return rc;
3312
3313	/* actually write all of the entries */
3314	rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3315	if (rc)
3316		return rc;
3317
3318	return 0;
3319}
3320
3321static int filename_write_helper(void *key, void *data, void *ptr)
3322{
 
 
 
 
3323	__le32 buf[4];
3324	struct filename_trans *ft = key;
3325	struct filename_trans_datum *otype = data;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3326	void *fp = ptr;
 
3327	int rc;
3328	u32 len;
3329
3330	len = strlen(ft->name);
3331	buf[0] = cpu_to_le32(len);
3332	rc = put_entry(buf, sizeof(u32), 1, fp);
3333	if (rc)
3334		return rc;
3335
3336	rc = put_entry(ft->name, sizeof(char), len, fp);
3337	if (rc)
3338		return rc;
3339
3340	buf[0] = cpu_to_le32(ft->stype);
3341	buf[1] = cpu_to_le32(ft->ttype);
3342	buf[2] = cpu_to_le32(ft->tclass);
3343	buf[3] = cpu_to_le32(otype->otype);
3344
3345	rc = put_entry(buf, sizeof(u32), 4, fp);
 
 
 
 
 
3346	if (rc)
3347		return rc;
3348
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3349	return 0;
3350}
3351
3352static int filename_trans_write(struct policydb *p, void *fp)
3353{
3354	u32 nel;
3355	__le32 buf[1];
3356	int rc;
3357
3358	if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3359		return 0;
3360
3361	nel = 0;
3362	rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3363	if (rc)
3364		return rc;
3365
3366	buf[0] = cpu_to_le32(nel);
3367	rc = put_entry(buf, sizeof(u32), 1, fp);
3368	if (rc)
3369		return rc;
3370
3371	rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3372	if (rc)
3373		return rc;
 
 
 
 
3374
3375	return 0;
 
 
3376}
3377
3378/*
3379 * Write the configuration data in a policy database
3380 * structure to a policy database binary representation
3381 * file.
3382 */
3383int policydb_write(struct policydb *p, void *fp)
3384{
3385	unsigned int i, num_syms;
3386	int rc;
3387	__le32 buf[4];
3388	u32 config;
3389	size_t len;
3390	struct policydb_compat_info *info;
3391
3392	/*
3393	 * refuse to write policy older than compressed avtab
3394	 * to simplify the writer.  There are other tests dropped
3395	 * since we assume this throughout the writer code.  Be
3396	 * careful if you ever try to remove this restriction
3397	 */
3398	if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3399		pr_err("SELinux: refusing to write policy version %d."
3400		       "  Because it is less than version %d\n", p->policyvers,
3401		       POLICYDB_VERSION_AVTAB);
3402		return -EINVAL;
3403	}
3404
3405	config = 0;
3406	if (p->mls_enabled)
3407		config |= POLICYDB_CONFIG_MLS;
3408
3409	if (p->reject_unknown)
3410		config |= REJECT_UNKNOWN;
3411	if (p->allow_unknown)
3412		config |= ALLOW_UNKNOWN;
3413
3414	/* Write the magic number and string identifiers. */
3415	buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3416	len = strlen(POLICYDB_STRING);
3417	buf[1] = cpu_to_le32(len);
3418	rc = put_entry(buf, sizeof(u32), 2, fp);
3419	if (rc)
3420		return rc;
3421	rc = put_entry(POLICYDB_STRING, 1, len, fp);
3422	if (rc)
3423		return rc;
3424
3425	/* Write the version, config, and table sizes. */
3426	info = policydb_lookup_compat(p->policyvers);
3427	if (!info) {
3428		pr_err("SELinux: compatibility lookup failed for policy "
3429		    "version %d", p->policyvers);
3430		return -EINVAL;
3431	}
3432
3433	buf[0] = cpu_to_le32(p->policyvers);
3434	buf[1] = cpu_to_le32(config);
3435	buf[2] = cpu_to_le32(info->sym_num);
3436	buf[3] = cpu_to_le32(info->ocon_num);
3437
3438	rc = put_entry(buf, sizeof(u32), 4, fp);
3439	if (rc)
3440		return rc;
3441
3442	if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3443		rc = ebitmap_write(&p->policycaps, fp);
3444		if (rc)
3445			return rc;
3446	}
3447
3448	if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3449		rc = ebitmap_write(&p->permissive_map, fp);
3450		if (rc)
3451			return rc;
3452	}
3453
3454	num_syms = info->sym_num;
3455	for (i = 0; i < num_syms; i++) {
3456		struct policy_data pd;
3457
3458		pd.fp = fp;
3459		pd.p = p;
3460
3461		buf[0] = cpu_to_le32(p->symtab[i].nprim);
3462		buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3463
3464		rc = put_entry(buf, sizeof(u32), 2, fp);
3465		if (rc)
3466			return rc;
3467		rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3468		if (rc)
3469			return rc;
3470	}
3471
3472	rc = avtab_write(p, &p->te_avtab, fp);
3473	if (rc)
3474		return rc;
3475
3476	rc = cond_write_list(p, p->cond_list, fp);
3477	if (rc)
3478		return rc;
3479
3480	rc = role_trans_write(p, fp);
3481	if (rc)
3482		return rc;
3483
3484	rc = role_allow_write(p->role_allow, fp);
3485	if (rc)
3486		return rc;
3487
3488	rc = filename_trans_write(p, fp);
3489	if (rc)
3490		return rc;
3491
3492	rc = ocontext_write(p, info, fp);
3493	if (rc)
3494		return rc;
3495
3496	rc = genfs_write(p, fp);
3497	if (rc)
3498		return rc;
3499
3500	rc = range_write(p, fp);
3501	if (rc)
3502		return rc;
3503
3504	for (i = 0; i < p->p_types.nprim; i++) {
3505		struct ebitmap *e = &p->type_attr_map_array[i];
3506
3507		rc = ebitmap_write(e, fp);
3508		if (rc)
3509			return rc;
3510	}
3511
3512	return 0;
3513}