1/*
   2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
   3 *
   4 *	This program is free software; you can redistribute it and/or modify
   5 *  	it under the terms of the GNU General Public License as published by
   6 *	the Free Software Foundation, version 2.
   7 *
   8 * Authors:
   9 * 	Casey Schaufler <casey@schaufler-ca.com>
  10 * 	Ahmed S. Darwish <darwish.07@gmail.com>
  11 *
  12 * Special thanks to the authors of selinuxfs.
  13 *
  14 *	Karl MacMillan <kmacmillan@tresys.com>
  15 *	James Morris <jmorris@redhat.com>
  16 *
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/vmalloc.h>
  21#include <linux/security.h>
  22#include <linux/mutex.h>
  23#include <linux/slab.h>
  24#include <net/net_namespace.h>
  25#include <net/cipso_ipv4.h>
  26#include <linux/seq_file.h>
  27#include <linux/ctype.h>
  28#include <linux/audit.h>
  29#include <linux/magic.h>
  30#include "smack.h"
  31
  32/*
  33 * smackfs pseudo filesystem.
  34 */
  35
  36enum smk_inos {
  37	SMK_ROOT_INO	= 2,
  38	SMK_LOAD	= 3,	/* load policy */
  39	SMK_CIPSO	= 4,	/* load label -> CIPSO mapping */
  40	SMK_DOI		= 5,	/* CIPSO DOI */
  41	SMK_DIRECT	= 6,	/* CIPSO level indicating direct label */
  42	SMK_AMBIENT	= 7,	/* internet ambient label */
  43	SMK_NETLBLADDR	= 8,	/* single label hosts */
  44	SMK_ONLYCAP	= 9,	/* the only "capable" label */
  45	SMK_LOGGING	= 10,	/* logging */
  46	SMK_LOAD_SELF	= 11,	/* task specific rules */
  47	SMK_ACCESSES	= 12,	/* access policy */
  48	SMK_MAPPED	= 13,	/* CIPSO level indicating mapped label */
  49	SMK_LOAD2	= 14,	/* load policy with long labels */
  50	SMK_LOAD_SELF2	= 15,	/* load task specific rules with long labels */
  51	SMK_ACCESS2	= 16,	/* make an access check with long labels */
  52	SMK_CIPSO2	= 17,	/* load long label -> CIPSO mapping */
  53	SMK_REVOKE_SUBJ	= 18,	/* set rules with subject label to '-' */
  54	SMK_CHANGE_RULE	= 19,	/* change or add rules (long labels) */
  55	SMK_SYSLOG	= 20,	/* change syslog label) */
  56};
  57
  58/*
  59 * List locks
  60 */
 
  61static DEFINE_MUTEX(smack_cipso_lock);
  62static DEFINE_MUTEX(smack_ambient_lock);
  63static DEFINE_MUTEX(smack_syslog_lock);
  64static DEFINE_MUTEX(smk_netlbladdr_lock);
  65
  66/*
  67 * This is the "ambient" label for network traffic.
  68 * If it isn't somehow marked, use this.
  69 * It can be reset via smackfs/ambient
  70 */
  71struct smack_known *smack_net_ambient;
  72
  73/*
  74 * This is the level in a CIPSO header that indicates a
  75 * smack label is contained directly in the category set.
  76 * It can be reset via smackfs/direct
  77 */
  78int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
  79
  80/*
  81 * This is the level in a CIPSO header that indicates a
  82 * secid is contained directly in the category set.
  83 * It can be reset via smackfs/mapped
  84 */
  85int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
  86
  87/*
  88 * Unless a process is running with this label even
  89 * having CAP_MAC_OVERRIDE isn't enough to grant
  90 * privilege to violate MAC policy. If no label is
  91 * designated (the NULL case) capabilities apply to
  92 * everyone. It is expected that the hat (^) label
  93 * will be used if any label is used.
  94 */
  95struct smack_known *smack_onlycap;
  96
  97/*
  98 * If this value is set restrict syslog use to the label specified.
  99 * It can be reset via smackfs/syslog
 100 */
 101struct smack_known *smack_syslog_label;
 102
 103/*
 104 * Certain IP addresses may be designated as single label hosts.
 105 * Packets are sent there unlabeled, but only from tasks that
 106 * can write to the specified label.
 107 */
 108
 109LIST_HEAD(smk_netlbladdr_list);
 110
 111/*
 112 * Rule lists are maintained for each label.
 113 * This master list is just for reading /smack/load and /smack/load2.
 114 */
 115struct smack_master_list {
 116	struct list_head	list;
 117	struct smack_rule	*smk_rule;
 118};
 119
 120LIST_HEAD(smack_rule_list);
 121
 122struct smack_parsed_rule {
 123	struct smack_known	*smk_subject;
 124	char			*smk_object;
 125	int			smk_access1;
 126	int			smk_access2;
 127};
 128
 129static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
 130
 131const char *smack_cipso_option = SMACK_CIPSO_OPTION;
 132
 133/*
 134 * Values for parsing cipso rules
 135 * SMK_DIGITLEN: Length of a digit field in a rule.
 136 * SMK_CIPSOMIN: Minimum possible cipso rule length.
 137 * SMK_CIPSOMAX: Maximum possible cipso rule length.
 138 */
 139#define SMK_DIGITLEN 4
 140#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
 141#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
 142
 143/*
 144 * Values for parsing MAC rules
 145 * SMK_ACCESS: Maximum possible combination of access permissions
 146 * SMK_ACCESSLEN: Maximum length for a rule access field
 147 * SMK_LOADLEN: Smack rule length
 148 */
 149#define SMK_OACCESS	"rwxa"
 150#define SMK_ACCESS	"rwxatl"
 151#define SMK_OACCESSLEN	(sizeof(SMK_OACCESS) - 1)
 152#define SMK_ACCESSLEN	(sizeof(SMK_ACCESS) - 1)
 153#define SMK_OLOADLEN	(SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
 154#define SMK_LOADLEN	(SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
 155
 156/*
 157 * Stricly for CIPSO level manipulation.
 158 * Set the category bit number in a smack label sized buffer.
 159 */
 160static inline void smack_catset_bit(unsigned int cat, char *catsetp)
 161{
 162	if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
 163		return;
 164
 165	catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
 166}
 167
 168/**
 169 * smk_netlabel_audit_set - fill a netlbl_audit struct
 170 * @nap: structure to fill
 171 */
 172static void smk_netlabel_audit_set(struct netlbl_audit *nap)
 173{
 174	struct smack_known *skp = smk_of_current();
 175
 176	nap->loginuid = audit_get_loginuid(current);
 177	nap->sessionid = audit_get_sessionid(current);
 178	nap->secid = skp->smk_secid;
 179}
 180
 181/*
 182 * Value for parsing single label host rules
 183 * "1.2.3.4 X"
 184 */
 185#define SMK_NETLBLADDRMIN	9
 186
 187/**
 188 * smk_set_access - add a rule to the rule list or replace an old rule
 189 * @srp: the rule to add or replace
 190 * @rule_list: the list of rules
 191 * @rule_lock: the rule list lock
 192 * @global: if non-zero, indicates a global rule
 193 *
 194 * Looks through the current subject/object/access list for
 195 * the subject/object pair and replaces the access that was
 196 * there. If the pair isn't found add it with the specified
 197 * access.
 198 *
 
 199 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
 200 * during the allocation of the new pair to add.
 201 */
 202static int smk_set_access(struct smack_parsed_rule *srp,
 203				struct list_head *rule_list,
 204				struct mutex *rule_lock, int global)
 205{
 206	struct smack_rule *sp;
 207	struct smack_master_list *smlp;
 208	int found = 0;
 209	int rc = 0;
 210
 211	mutex_lock(rule_lock);
 212
 213	/*
 214	 * Because the object label is less likely to match
 215	 * than the subject label check it first
 216	 */
 217	list_for_each_entry_rcu(sp, rule_list, list) {
 218		if (sp->smk_object == srp->smk_object &&
 219		    sp->smk_subject == srp->smk_subject) {
 220			found = 1;
 221			sp->smk_access |= srp->smk_access1;
 222			sp->smk_access &= ~srp->smk_access2;
 223			break;
 224		}
 225	}
 
 
 226
 227	if (found == 0) {
 228		sp = kzalloc(sizeof(*sp), GFP_KERNEL);
 229		if (sp == NULL) {
 230			rc = -ENOMEM;
 231			goto out;
 232		}
 233
 234		sp->smk_subject = srp->smk_subject;
 235		sp->smk_object = srp->smk_object;
 236		sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
 237
 238		list_add_rcu(&sp->list, rule_list);
 239		/*
 240		 * If this is a global as opposed to self and a new rule
 241		 * it needs to get added for reporting.
 242		 */
 243		if (global) {
 244			smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
 245			if (smlp != NULL) {
 246				smlp->smk_rule = sp;
 247				list_add_rcu(&smlp->list, &smack_rule_list);
 248			} else
 249				rc = -ENOMEM;
 250		}
 251	}
 252
 253out:
 254	mutex_unlock(rule_lock);
 255	return rc;
 256}
 257
 258/**
 259 * smk_perm_from_str - parse smack accesses from a text string
 260 * @string: a text string that contains a Smack accesses code
 261 *
 262 * Returns an integer with respective bits set for specified accesses.
 263 */
 264static int smk_perm_from_str(const char *string)
 265{
 266	int perm = 0;
 267	const char *cp;
 268
 269	for (cp = string; ; cp++)
 270		switch (*cp) {
 271		case '-':
 272			break;
 273		case 'r':
 274		case 'R':
 275			perm |= MAY_READ;
 276			break;
 277		case 'w':
 278		case 'W':
 279			perm |= MAY_WRITE;
 280			break;
 281		case 'x':
 282		case 'X':
 283			perm |= MAY_EXEC;
 284			break;
 285		case 'a':
 286		case 'A':
 287			perm |= MAY_APPEND;
 288			break;
 289		case 't':
 290		case 'T':
 291			perm |= MAY_TRANSMUTE;
 292			break;
 293		case 'l':
 294		case 'L':
 295			perm |= MAY_LOCK;
 296			break;
 297		default:
 298			return perm;
 299		}
 300}
 301
 302/**
 303 * smk_fill_rule - Fill Smack rule from strings
 304 * @subject: subject label string
 305 * @object: object label string
 306 * @access1: access string
 307 * @access2: string with permissions to be removed
 308 * @rule: Smack rule
 309 * @import: if non-zero, import labels
 310 * @len: label length limit
 311 *
 312 * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
 313 * or object is missing.
 314 */
 315static int smk_fill_rule(const char *subject, const char *object,
 316				const char *access1, const char *access2,
 317				struct smack_parsed_rule *rule, int import,
 318				int len)
 319{
 
 
 320	const char *cp;
 321	struct smack_known *skp;
 322
 323	if (import) {
 324		rule->smk_subject = smk_import_entry(subject, len);
 325		if (rule->smk_subject == NULL)
 326			return -EINVAL;
 327
 328		rule->smk_object = smk_import(object, len);
 329		if (rule->smk_object == NULL)
 330			return -EINVAL;
 331	} else {
 332		cp = smk_parse_smack(subject, len);
 333		if (cp == NULL)
 334			return -EINVAL;
 335		skp = smk_find_entry(cp);
 336		kfree(cp);
 337		if (skp == NULL)
 338			return -ENOENT;
 339		rule->smk_subject = skp;
 340
 341		cp = smk_parse_smack(object, len);
 342		if (cp == NULL)
 343			return -EINVAL;
 344		skp = smk_find_entry(cp);
 345		kfree(cp);
 346		if (skp == NULL)
 347			return -ENOENT;
 348		rule->smk_object = skp->smk_known;
 349	}
 350
 351	rule->smk_access1 = smk_perm_from_str(access1);
 352	if (access2)
 353		rule->smk_access2 = smk_perm_from_str(access2);
 354	else
 355		rule->smk_access2 = ~rule->smk_access1;
 356
 357	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 358}
 359
 360/**
 361 * smk_parse_rule - parse Smack rule from load string
 362 * @data: string to be parsed whose size is SMK_LOADLEN
 363 * @rule: Smack rule
 364 * @import: if non-zero, import labels
 365 *
 366 * Returns 0 on success, -1 on errors.
 367 */
 368static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
 369				int import)
 370{
 371	int rc;
 372
 373	rc = smk_fill_rule(data, data + SMK_LABELLEN,
 374			   data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
 375			   import, SMK_LABELLEN);
 376	return rc;
 377}
 378
 379/**
 380 * smk_parse_long_rule - parse Smack rule from rule string
 381 * @data: string to be parsed, null terminated
 382 * @rule: Will be filled with Smack parsed rule
 383 * @import: if non-zero, import labels
 384 * @tokens: numer of substrings expected in data
 385 *
 386 * Returns number of processed bytes on success, -1 on failure.
 387 */
 388static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
 389				int import, int tokens)
 390{
 391	ssize_t cnt = 0;
 392	char *tok[4];
 393	int rc;
 394	int i;
 395
 396	/*
 397	 * Parsing the rule in-place, filling all white-spaces with '\0'
 398	 */
 399	for (i = 0; i < tokens; ++i) {
 400		while (isspace(data[cnt]))
 401			data[cnt++] = '\0';
 402
 403		if (data[cnt] == '\0')
 404			/* Unexpected end of data */
 405			return -1;
 406
 407		tok[i] = data + cnt;
 408
 409		while (data[cnt] && !isspace(data[cnt]))
 410			++cnt;
 411	}
 412	while (isspace(data[cnt]))
 413		data[cnt++] = '\0';
 414
 415	while (i < 4)
 416		tok[i++] = NULL;
 417
 418	rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
 419	return rc == 0 ? cnt : rc;
 420}
 421
 422#define SMK_FIXED24_FMT	0	/* Fixed 24byte label format */
 423#define SMK_LONG_FMT	1	/* Variable long label format */
 424#define SMK_CHANGE_FMT	2	/* Rule modification format */
 425/**
 426 * smk_write_rules_list - write() for any /smack rule file
 427 * @file: file pointer, not actually used
 428 * @buf: where to get the data from
 429 * @count: bytes sent
 430 * @ppos: where to start - must be 0
 431 * @rule_list: the list of rules to write to
 432 * @rule_lock: lock for the rule list
 433 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
 434 *
 435 * Get one smack access rule from above.
 436 * The format for SMK_LONG_FMT is:
 437 *	"subject<whitespace>object<whitespace>access[<whitespace>...]"
 438 * The format for SMK_FIXED24_FMT is exactly:
 439 *	"subject                 object                  rwxat"
 440 * The format for SMK_CHANGE_FMT is:
 441 *	"subject<whitespace>object<whitespace>
 442 *	 acc_enable<whitespace>acc_disable[<whitespace>...]"
 443 */
 444static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 445					size_t count, loff_t *ppos,
 446					struct list_head *rule_list,
 447					struct mutex *rule_lock, int format)
 448{
 449	struct smack_parsed_rule rule;
 
 
 450	char *data;
 451	int rc;
 452	int trunc = 0;
 453	int tokens;
 454	ssize_t cnt = 0;
 455
 456	/*
 457	 * No partial writes.
 458	 * Enough data must be present.
 459	 */
 460	if (*ppos != 0)
 461		return -EINVAL;
 462
 463	if (format == SMK_FIXED24_FMT) {
 464		/*
 465		 * Minor hack for backward compatibility
 466		 */
 467		if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
 468			return -EINVAL;
 469	} else {
 470		if (count >= PAGE_SIZE) {
 471			count = PAGE_SIZE - 1;
 472			trunc = 1;
 473		}
 474	}
 475
 476	data = kmalloc(count + 1, GFP_KERNEL);
 477	if (data == NULL)
 478		return -ENOMEM;
 479
 480	if (copy_from_user(data, buf, count) != 0) {
 481		rc = -EFAULT;
 482		goto out;
 483	}
 484
 485	/*
 486	 * In case of parsing only part of user buf,
 487	 * avoid having partial rule at the data buffer
 488	 */
 489	if (trunc) {
 490		while (count > 0 && (data[count - 1] != '\n'))
 491			--count;
 492		if (count == 0) {
 493			rc = -EINVAL;
 494			goto out;
 495		}
 496	}
 497
 498	data[count] = '\0';
 499	tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
 500	while (cnt < count) {
 501		if (format == SMK_FIXED24_FMT) {
 502			rc = smk_parse_rule(data, &rule, 1);
 503			if (rc != 0) {
 504				rc = -EINVAL;
 505				goto out;
 506			}
 507			cnt = count;
 508		} else {
 509			rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
 510			if (rc <= 0) {
 511				rc = -EINVAL;
 512				goto out;
 513			}
 514			cnt += rc;
 515		}
 516
 517		if (rule_list == NULL)
 518			rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
 519				&rule.smk_subject->smk_rules_lock, 1);
 520		else
 521			rc = smk_set_access(&rule, rule_list, rule_lock, 0);
 522
 523		if (rc)
 524			goto out;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 525	}
 526
 527	rc = cnt;
 
 528out:
 529	kfree(data);
 530	return rc;
 531}
 532
 533/*
 534 * Core logic for smackfs seq list operations.
 535 */
 536
 537static void *smk_seq_start(struct seq_file *s, loff_t *pos,
 538				struct list_head *head)
 539{
 540	struct list_head *list;
 541
 542	/*
 543	 * This is 0 the first time through.
 544	 */
 545	if (s->index == 0)
 546		s->private = head;
 547
 548	if (s->private == NULL)
 549		return NULL;
 550
 551	list = s->private;
 552	if (list_empty(list))
 553		return NULL;
 554
 555	if (s->index == 0)
 556		return list->next;
 557	return list;
 558}
 559
 560static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
 561				struct list_head *head)
 562{
 563	struct list_head *list = v;
 564
 565	if (list_is_last(list, head)) {
 566		s->private = NULL;
 567		return NULL;
 568	}
 569	s->private = list->next;
 570	return list->next;
 571}
 572
 573static void smk_seq_stop(struct seq_file *s, void *v)
 574{
 575	/* No-op */
 576}
 577
 578static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
 579{
 580	/*
 581	 * Don't show any rules with label names too long for
 582	 * interface file (/smack/load or /smack/load2)
 583	 * because you should expect to be able to write
 584	 * anything you read back.
 585	 */
 586	if (strlen(srp->smk_subject->smk_known) >= max ||
 587	    strlen(srp->smk_object) >= max)
 588		return;
 589
 590	if (srp->smk_access == 0)
 591		return;
 592
 593	seq_printf(s, "%s %s", srp->smk_subject->smk_known, srp->smk_object);
 594
 595	seq_putc(s, ' ');
 596
 597	if (srp->smk_access & MAY_READ)
 598		seq_putc(s, 'r');
 599	if (srp->smk_access & MAY_WRITE)
 600		seq_putc(s, 'w');
 601	if (srp->smk_access & MAY_EXEC)
 602		seq_putc(s, 'x');
 603	if (srp->smk_access & MAY_APPEND)
 604		seq_putc(s, 'a');
 605	if (srp->smk_access & MAY_TRANSMUTE)
 606		seq_putc(s, 't');
 607	if (srp->smk_access & MAY_LOCK)
 608		seq_putc(s, 'l');
 609
 610	seq_putc(s, '\n');
 611}
 612
 613/*
 614 * Seq_file read operations for /smack/load
 615 */
 616
 617static void *load2_seq_start(struct seq_file *s, loff_t *pos)
 618{
 619	return smk_seq_start(s, pos, &smack_rule_list);
 620}
 621
 622static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
 623{
 624	return smk_seq_next(s, v, pos, &smack_rule_list);
 625}
 626
 627static int load_seq_show(struct seq_file *s, void *v)
 628{
 629	struct list_head *list = v;
 630	struct smack_master_list *smlp =
 631		 list_entry(list, struct smack_master_list, list);
 632
 633	smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
 634
 635	return 0;
 636}
 637
 638static const struct seq_operations load_seq_ops = {
 639	.start = load2_seq_start,
 640	.next  = load2_seq_next,
 641	.show  = load_seq_show,
 642	.stop  = smk_seq_stop,
 643};
 644
 645/**
 646 * smk_open_load - open() for /smack/load
 647 * @inode: inode structure representing file
 648 * @file: "load" file pointer
 649 *
 650 * For reading, use load_seq_* seq_file reading operations.
 651 */
 652static int smk_open_load(struct inode *inode, struct file *file)
 653{
 654	return seq_open(file, &load_seq_ops);
 655}
 656
 657/**
 658 * smk_write_load - write() for /smack/load
 659 * @file: file pointer, not actually used
 660 * @buf: where to get the data from
 661 * @count: bytes sent
 662 * @ppos: where to start - must be 0
 663 *
 664 */
 665static ssize_t smk_write_load(struct file *file, const char __user *buf,
 666			      size_t count, loff_t *ppos)
 667{
 
 668	/*
 669	 * Must have privilege.
 670	 * No partial writes.
 671	 * Enough data must be present.
 672	 */
 673	if (!smack_privileged(CAP_MAC_ADMIN))
 674		return -EPERM;
 675
 676	return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
 677				    SMK_FIXED24_FMT);
 678}
 679
 680static const struct file_operations smk_load_ops = {
 681	.open           = smk_open_load,
 682	.read		= seq_read,
 683	.llseek         = seq_lseek,
 684	.write		= smk_write_load,
 685	.release        = seq_release,
 686};
 687
 688/**
 689 * smk_cipso_doi - initialize the CIPSO domain
 690 */
 691static void smk_cipso_doi(void)
 692{
 693	int rc;
 694	struct cipso_v4_doi *doip;
 695	struct netlbl_audit nai;
 696
 697	smk_netlabel_audit_set(&nai);
 698
 699	rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
 700	if (rc != 0)
 701		printk(KERN_WARNING "%s:%d remove rc = %d\n",
 702		       __func__, __LINE__, rc);
 703
 704	doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
 705	if (doip == NULL)
 706		panic("smack:  Failed to initialize cipso DOI.\n");
 707	doip->map.std = NULL;
 708	doip->doi = smk_cipso_doi_value;
 709	doip->type = CIPSO_V4_MAP_PASS;
 710	doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
 711	for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
 712		doip->tags[rc] = CIPSO_V4_TAG_INVALID;
 713
 714	rc = netlbl_cfg_cipsov4_add(doip, &nai);
 715	if (rc != 0) {
 716		printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
 717		       __func__, __LINE__, rc);
 718		kfree(doip);
 719		return;
 720	}
 721	rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
 722	if (rc != 0) {
 723		printk(KERN_WARNING "%s:%d map add rc = %d\n",
 724		       __func__, __LINE__, rc);
 725		kfree(doip);
 726		return;
 727	}
 728}
 729
 730/**
 731 * smk_unlbl_ambient - initialize the unlabeled domain
 732 * @oldambient: previous domain string
 733 */
 734static void smk_unlbl_ambient(char *oldambient)
 735{
 736	int rc;
 737	struct netlbl_audit nai;
 738
 739	smk_netlabel_audit_set(&nai);
 740
 741	if (oldambient != NULL) {
 742		rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
 743		if (rc != 0)
 744			printk(KERN_WARNING "%s:%d remove rc = %d\n",
 745			       __func__, __LINE__, rc);
 746	}
 747	if (smack_net_ambient == NULL)
 748		smack_net_ambient = &smack_known_floor;
 749
 750	rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
 751				      NULL, NULL, &nai);
 752	if (rc != 0)
 753		printk(KERN_WARNING "%s:%d add rc = %d\n",
 754		       __func__, __LINE__, rc);
 755}
 756
 757/*
 758 * Seq_file read operations for /smack/cipso
 759 */
 760
 761static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
 762{
 763	return smk_seq_start(s, pos, &smack_known_list);
 764}
 765
 766static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
 767{
 768	return smk_seq_next(s, v, pos, &smack_known_list);
 769}
 770
 771/*
 772 * Print cipso labels in format:
 773 * label level[/cat[,cat]]
 774 */
 775static int cipso_seq_show(struct seq_file *s, void *v)
 776{
 777	struct list_head  *list = v;
 778	struct smack_known *skp =
 779		 list_entry(list, struct smack_known, list);
 780	struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 781	char sep = '/';
 782	int i;
 783
 784	/*
 785	 * Don't show a label that could not have been set using
 786	 * /smack/cipso. This is in support of the notion that
 787	 * anything read from /smack/cipso ought to be writeable
 788	 * to /smack/cipso.
 789	 *
 790	 * /smack/cipso2 should be used instead.
 791	 */
 792	if (strlen(skp->smk_known) >= SMK_LABELLEN)
 793		return 0;
 794
 795	seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 796
 797	for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
 798	     i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
 799		seq_printf(s, "%c%d", sep, i);
 800		sep = ',';
 801	}
 802
 803	seq_putc(s, '\n');
 804
 805	return 0;
 806}
 807
 808static const struct seq_operations cipso_seq_ops = {
 809	.start = cipso_seq_start,
 810	.next  = cipso_seq_next,
 811	.show  = cipso_seq_show,
 812	.stop  = smk_seq_stop,
 813};
 814
 815/**
 816 * smk_open_cipso - open() for /smack/cipso
 817 * @inode: inode structure representing file
 818 * @file: "cipso" file pointer
 819 *
 820 * Connect our cipso_seq_* operations with /smack/cipso
 821 * file_operations
 822 */
 823static int smk_open_cipso(struct inode *inode, struct file *file)
 824{
 825	return seq_open(file, &cipso_seq_ops);
 826}
 827
 828/**
 829 * smk_set_cipso - do the work for write() for cipso and cipso2
 830 * @file: file pointer, not actually used
 831 * @buf: where to get the data from
 832 * @count: bytes sent
 833 * @ppos: where to start
 834 * @format: /smack/cipso or /smack/cipso2
 835 *
 836 * Accepts only one cipso rule per write call.
 837 * Returns number of bytes written or error code, as appropriate
 838 */
 839static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 840				size_t count, loff_t *ppos, int format)
 841{
 842	struct smack_known *skp;
 843	struct netlbl_lsm_secattr ncats;
 844	char mapcatset[SMK_CIPSOLEN];
 845	int maplevel;
 846	unsigned int cat;
 847	int catlen;
 848	ssize_t rc = -EINVAL;
 849	char *data = NULL;
 850	char *rule;
 851	int ret;
 852	int i;
 853
 854	/*
 855	 * Must have privilege.
 856	 * No partial writes.
 857	 * Enough data must be present.
 858	 */
 859	if (!smack_privileged(CAP_MAC_ADMIN))
 860		return -EPERM;
 861	if (*ppos != 0)
 862		return -EINVAL;
 863	if (format == SMK_FIXED24_FMT &&
 864	    (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
 865		return -EINVAL;
 866
 867	data = kzalloc(count + 1, GFP_KERNEL);
 868	if (data == NULL)
 869		return -ENOMEM;
 870
 871	if (copy_from_user(data, buf, count) != 0) {
 872		rc = -EFAULT;
 873		goto unlockedout;
 874	}
 875
 876	data[count] = '\0';
 877	rule = data;
 878	/*
 879	 * Only allow one writer at a time. Writes should be
 880	 * quite rare and small in any case.
 881	 */
 882	mutex_lock(&smack_cipso_lock);
 883
 884	skp = smk_import_entry(rule, 0);
 885	if (skp == NULL)
 886		goto out;
 887
 888	if (format == SMK_FIXED24_FMT)
 889		rule += SMK_LABELLEN;
 890	else
 891		rule += strlen(skp->smk_known) + 1;
 892
 893	ret = sscanf(rule, "%d", &maplevel);
 894	if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
 895		goto out;
 896
 897	rule += SMK_DIGITLEN;
 898	ret = sscanf(rule, "%d", &catlen);
 899	if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
 900		goto out;
 901
 902	if (format == SMK_FIXED24_FMT &&
 903	    count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
 904		goto out;
 905
 906	memset(mapcatset, 0, sizeof(mapcatset));
 907
 908	for (i = 0; i < catlen; i++) {
 909		rule += SMK_DIGITLEN;
 910		ret = sscanf(rule, "%u", &cat);
 911		if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
 912			goto out;
 913
 914		smack_catset_bit(cat, mapcatset);
 915	}
 916
 917	rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
 918	if (rc >= 0) {
 919		netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat);
 920		skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
 921		skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
 922		rc = count;
 923	}
 924
 925out:
 926	mutex_unlock(&smack_cipso_lock);
 927unlockedout:
 928	kfree(data);
 929	return rc;
 930}
 931
 932/**
 933 * smk_write_cipso - write() for /smack/cipso
 934 * @file: file pointer, not actually used
 935 * @buf: where to get the data from
 936 * @count: bytes sent
 937 * @ppos: where to start
 938 *
 939 * Accepts only one cipso rule per write call.
 940 * Returns number of bytes written or error code, as appropriate
 941 */
 942static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
 943			       size_t count, loff_t *ppos)
 944{
 945	return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
 946}
 947
 948static const struct file_operations smk_cipso_ops = {
 949	.open           = smk_open_cipso,
 950	.read		= seq_read,
 951	.llseek         = seq_lseek,
 952	.write		= smk_write_cipso,
 953	.release        = seq_release,
 954};
 955
 956/*
 957 * Seq_file read operations for /smack/cipso2
 958 */
 959
 960/*
 961 * Print cipso labels in format:
 962 * label level[/cat[,cat]]
 963 */
 964static int cipso2_seq_show(struct seq_file *s, void *v)
 965{
 966	struct list_head  *list = v;
 967	struct smack_known *skp =
 968		 list_entry(list, struct smack_known, list);
 969	struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 970	char sep = '/';
 971	int i;
 972
 973	seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 974
 975	for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
 976	     i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
 977		seq_printf(s, "%c%d", sep, i);
 978		sep = ',';
 979	}
 980
 981	seq_putc(s, '\n');
 982
 983	return 0;
 984}
 985
 986static const struct seq_operations cipso2_seq_ops = {
 987	.start = cipso_seq_start,
 988	.next  = cipso_seq_next,
 989	.show  = cipso2_seq_show,
 990	.stop  = smk_seq_stop,
 991};
 992
 993/**
 994 * smk_open_cipso2 - open() for /smack/cipso2
 995 * @inode: inode structure representing file
 996 * @file: "cipso2" file pointer
 997 *
 998 * Connect our cipso_seq_* operations with /smack/cipso2
 999 * file_operations
1000 */
1001static int smk_open_cipso2(struct inode *inode, struct file *file)
1002{
1003	return seq_open(file, &cipso2_seq_ops);
1004}
1005
1006/**
1007 * smk_write_cipso2 - write() for /smack/cipso2
1008 * @file: file pointer, not actually used
1009 * @buf: where to get the data from
1010 * @count: bytes sent
1011 * @ppos: where to start
1012 *
1013 * Accepts only one cipso rule per write call.
1014 * Returns number of bytes written or error code, as appropriate
1015 */
1016static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1017			      size_t count, loff_t *ppos)
1018{
1019	return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1020}
1021
1022static const struct file_operations smk_cipso2_ops = {
1023	.open           = smk_open_cipso2,
1024	.read		= seq_read,
1025	.llseek         = seq_lseek,
1026	.write		= smk_write_cipso2,
1027	.release        = seq_release,
1028};
1029
1030/*
1031 * Seq_file read operations for /smack/netlabel
1032 */
1033
1034static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
1035{
1036	return smk_seq_start(s, pos, &smk_netlbladdr_list);
1037}
1038
1039static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1040{
1041	return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
1042}
1043#define BEBITS	(sizeof(__be32) * 8)
1044
1045/*
1046 * Print host/label pairs
1047 */
1048static int netlbladdr_seq_show(struct seq_file *s, void *v)
1049{
1050	struct list_head *list = v;
1051	struct smk_netlbladdr *skp =
1052			 list_entry(list, struct smk_netlbladdr, list);
1053	unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
1054	int maskn;
1055	u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
1056
1057	for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
1058
1059	seq_printf(s, "%u.%u.%u.%u/%d %s\n",
1060		hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
1061
1062	return 0;
1063}
1064
1065static const struct seq_operations netlbladdr_seq_ops = {
1066	.start = netlbladdr_seq_start,
1067	.next  = netlbladdr_seq_next,
1068	.show  = netlbladdr_seq_show,
1069	.stop  = smk_seq_stop,
1070};
1071
1072/**
1073 * smk_open_netlbladdr - open() for /smack/netlabel
1074 * @inode: inode structure representing file
1075 * @file: "netlabel" file pointer
1076 *
1077 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1078 * file_operations
1079 */
1080static int smk_open_netlbladdr(struct inode *inode, struct file *file)
1081{
1082	return seq_open(file, &netlbladdr_seq_ops);
1083}
1084
1085/**
1086 * smk_netlbladdr_insert
1087 * @new : netlabel to insert
1088 *
1089 * This helper insert netlabel in the smack_netlbladdrs list
1090 * sorted by netmask length (longest to smallest)
1091 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1092 *
1093 */
1094static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
1095{
1096	struct smk_netlbladdr *m, *m_next;
1097
1098	if (list_empty(&smk_netlbladdr_list)) {
1099		list_add_rcu(&new->list, &smk_netlbladdr_list);
1100		return;
1101	}
1102
1103	m = list_entry_rcu(smk_netlbladdr_list.next,
1104			   struct smk_netlbladdr, list);
1105
1106	/* the comparison '>' is a bit hacky, but works */
1107	if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
1108		list_add_rcu(&new->list, &smk_netlbladdr_list);
1109		return;
1110	}
1111
1112	list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
1113		if (list_is_last(&m->list, &smk_netlbladdr_list)) {
1114			list_add_rcu(&new->list, &m->list);
1115			return;
1116		}
1117		m_next = list_entry_rcu(m->list.next,
1118					struct smk_netlbladdr, list);
1119		if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
1120			list_add_rcu(&new->list, &m->list);
1121			return;
1122		}
1123	}
1124}
1125
1126
1127/**
1128 * smk_write_netlbladdr - write() for /smack/netlabel
1129 * @file: file pointer, not actually used
1130 * @buf: where to get the data from
1131 * @count: bytes sent
1132 * @ppos: where to start
1133 *
1134 * Accepts only one netlbladdr per write call.
1135 * Returns number of bytes written or error code, as appropriate
1136 */
1137static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
1138				size_t count, loff_t *ppos)
1139{
1140	struct smk_netlbladdr *skp;
1141	struct sockaddr_in newname;
1142	char *smack;
1143	char *sp;
1144	char *data;
1145	char *host = (char *)&newname.sin_addr.s_addr;
1146	int rc;
1147	struct netlbl_audit audit_info;
1148	struct in_addr mask;
1149	unsigned int m;
1150	int found;
1151	u32 mask_bits = (1<<31);
1152	__be32 nsa;
1153	u32 temp_mask;
1154
1155	/*
1156	 * Must have privilege.
1157	 * No partial writes.
1158	 * Enough data must be present.
1159	 * "<addr/mask, as a.b.c.d/e><space><label>"
1160	 * "<addr, as a.b.c.d><space><label>"
1161	 */
1162	if (!smack_privileged(CAP_MAC_ADMIN))
1163		return -EPERM;
1164	if (*ppos != 0)
1165		return -EINVAL;
1166	if (count < SMK_NETLBLADDRMIN)
1167		return -EINVAL;
1168
1169	data = kzalloc(count + 1, GFP_KERNEL);
1170	if (data == NULL)
1171		return -ENOMEM;
1172
1173	if (copy_from_user(data, buf, count) != 0) {
1174		rc = -EFAULT;
1175		goto free_data_out;
1176	}
1177
1178	smack = kzalloc(count + 1, GFP_KERNEL);
1179	if (smack == NULL) {
1180		rc = -ENOMEM;
1181		goto free_data_out;
1182	}
1183
1184	data[count] = '\0';
1185
1186	rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
1187		&host[0], &host[1], &host[2], &host[3], &m, smack);
1188	if (rc != 6) {
1189		rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1190			&host[0], &host[1], &host[2], &host[3], smack);
1191		if (rc != 5) {
1192			rc = -EINVAL;
1193			goto free_out;
1194		}
1195		m = BEBITS;
1196	}
1197	if (m > BEBITS) {
1198		rc = -EINVAL;
1199		goto free_out;
1200	}
1201
1202	/*
1203	 * If smack begins with '-', it is an option, don't import it
1204	 */
1205	if (smack[0] != '-') {
1206		sp = smk_import(smack, 0);
1207		if (sp == NULL) {
1208			rc = -EINVAL;
1209			goto free_out;
1210		}
1211	} else {
1212		/* check known options */
1213		if (strcmp(smack, smack_cipso_option) == 0)
1214			sp = (char *)smack_cipso_option;
1215		else {
1216			rc = -EINVAL;
1217			goto free_out;
1218		}
1219	}
1220
1221	for (temp_mask = 0; m > 0; m--) {
1222		temp_mask |= mask_bits;
1223		mask_bits >>= 1;
1224	}
1225	mask.s_addr = cpu_to_be32(temp_mask);
1226
1227	newname.sin_addr.s_addr &= mask.s_addr;
1228	/*
1229	 * Only allow one writer at a time. Writes should be
1230	 * quite rare and small in any case.
1231	 */
1232	mutex_lock(&smk_netlbladdr_lock);
1233
1234	nsa = newname.sin_addr.s_addr;
1235	/* try to find if the prefix is already in the list */
1236	found = 0;
1237	list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
1238		if (skp->smk_host.sin_addr.s_addr == nsa &&
1239		    skp->smk_mask.s_addr == mask.s_addr) {
1240			found = 1;
1241			break;
1242		}
1243	}
1244	smk_netlabel_audit_set(&audit_info);
1245
1246	if (found == 0) {
1247		skp = kzalloc(sizeof(*skp), GFP_KERNEL);
1248		if (skp == NULL)
1249			rc = -ENOMEM;
1250		else {
1251			rc = 0;
1252			skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
1253			skp->smk_mask.s_addr = mask.s_addr;
1254			skp->smk_label = sp;
1255			smk_netlbladdr_insert(skp);
1256		}
1257	} else {
1258		/* we delete the unlabeled entry, only if the previous label
1259		 * wasn't the special CIPSO option */
1260		if (skp->smk_label != smack_cipso_option)
1261			rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1262					&skp->smk_host.sin_addr, &skp->smk_mask,
1263					PF_INET, &audit_info);
1264		else
1265			rc = 0;
1266		skp->smk_label = sp;
1267	}
1268
1269	/*
1270	 * Now tell netlabel about the single label nature of
1271	 * this host so that incoming packets get labeled.
1272	 * but only if we didn't get the special CIPSO option
1273	 */
1274	if (rc == 0 && sp != smack_cipso_option)
1275		rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1276			&skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
1277			smack_to_secid(skp->smk_label), &audit_info);
1278
1279	if (rc == 0)
1280		rc = count;
1281
1282	mutex_unlock(&smk_netlbladdr_lock);
1283
1284free_out:
1285	kfree(smack);
1286free_data_out:
1287	kfree(data);
1288
1289	return rc;
1290}
1291
1292static const struct file_operations smk_netlbladdr_ops = {
1293	.open           = smk_open_netlbladdr,
1294	.read		= seq_read,
1295	.llseek         = seq_lseek,
1296	.write		= smk_write_netlbladdr,
1297	.release        = seq_release,
1298};
1299
1300/**
1301 * smk_read_doi - read() for /smack/doi
1302 * @filp: file pointer, not actually used
1303 * @buf: where to put the result
1304 * @count: maximum to send along
1305 * @ppos: where to start
1306 *
1307 * Returns number of bytes read or error code, as appropriate
1308 */
1309static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1310			    size_t count, loff_t *ppos)
1311{
1312	char temp[80];
1313	ssize_t rc;
1314
1315	if (*ppos != 0)
1316		return 0;
1317
1318	sprintf(temp, "%d", smk_cipso_doi_value);
1319	rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1320
1321	return rc;
1322}
1323
1324/**
1325 * smk_write_doi - write() for /smack/doi
1326 * @file: file pointer, not actually used
1327 * @buf: where to get the data from
1328 * @count: bytes sent
1329 * @ppos: where to start
1330 *
1331 * Returns number of bytes written or error code, as appropriate
1332 */
1333static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1334			     size_t count, loff_t *ppos)
1335{
1336	char temp[80];
1337	int i;
1338
1339	if (!smack_privileged(CAP_MAC_ADMIN))
1340		return -EPERM;
1341
1342	if (count >= sizeof(temp) || count == 0)
1343		return -EINVAL;
1344
1345	if (copy_from_user(temp, buf, count) != 0)
1346		return -EFAULT;
1347
1348	temp[count] = '\0';
1349
1350	if (sscanf(temp, "%d", &i) != 1)
1351		return -EINVAL;
1352
1353	smk_cipso_doi_value = i;
1354
1355	smk_cipso_doi();
1356
1357	return count;
1358}
1359
1360static const struct file_operations smk_doi_ops = {
1361	.read		= smk_read_doi,
1362	.write		= smk_write_doi,
1363	.llseek		= default_llseek,
1364};
1365
1366/**
1367 * smk_read_direct - read() for /smack/direct
1368 * @filp: file pointer, not actually used
1369 * @buf: where to put the result
1370 * @count: maximum to send along
1371 * @ppos: where to start
1372 *
1373 * Returns number of bytes read or error code, as appropriate
1374 */
1375static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1376			       size_t count, loff_t *ppos)
1377{
1378	char temp[80];
1379	ssize_t rc;
1380
1381	if (*ppos != 0)
1382		return 0;
1383
1384	sprintf(temp, "%d", smack_cipso_direct);
1385	rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1386
1387	return rc;
1388}
1389
1390/**
1391 * smk_write_direct - write() for /smack/direct
1392 * @file: file pointer, not actually used
1393 * @buf: where to get the data from
1394 * @count: bytes sent
1395 * @ppos: where to start
1396 *
1397 * Returns number of bytes written or error code, as appropriate
1398 */
1399static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1400				size_t count, loff_t *ppos)
1401{
1402	struct smack_known *skp;
1403	char temp[80];
1404	int i;
1405
1406	if (!smack_privileged(CAP_MAC_ADMIN))
1407		return -EPERM;
1408
1409	if (count >= sizeof(temp) || count == 0)
1410		return -EINVAL;
1411
1412	if (copy_from_user(temp, buf, count) != 0)
1413		return -EFAULT;
1414
1415	temp[count] = '\0';
1416
1417	if (sscanf(temp, "%d", &i) != 1)
1418		return -EINVAL;
1419
1420	/*
1421	 * Don't do anything if the value hasn't actually changed.
1422	 * If it is changing reset the level on entries that were
1423	 * set up to be direct when they were created.
1424	 */
1425	if (smack_cipso_direct != i) {
1426		mutex_lock(&smack_known_lock);
1427		list_for_each_entry_rcu(skp, &smack_known_list, list)
1428			if (skp->smk_netlabel.attr.mls.lvl ==
1429			    smack_cipso_direct)
1430				skp->smk_netlabel.attr.mls.lvl = i;
1431		smack_cipso_direct = i;
1432		mutex_unlock(&smack_known_lock);
1433	}
1434
1435	return count;
1436}
1437
1438static const struct file_operations smk_direct_ops = {
1439	.read		= smk_read_direct,
1440	.write		= smk_write_direct,
1441	.llseek		= default_llseek,
1442};
1443
1444/**
1445 * smk_read_mapped - read() for /smack/mapped
1446 * @filp: file pointer, not actually used
1447 * @buf: where to put the result
1448 * @count: maximum to send along
1449 * @ppos: where to start
1450 *
1451 * Returns number of bytes read or error code, as appropriate
1452 */
1453static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1454			       size_t count, loff_t *ppos)
1455{
1456	char temp[80];
1457	ssize_t rc;
1458
1459	if (*ppos != 0)
1460		return 0;
1461
1462	sprintf(temp, "%d", smack_cipso_mapped);
1463	rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1464
1465	return rc;
1466}
1467
1468/**
1469 * smk_write_mapped - write() for /smack/mapped
1470 * @file: file pointer, not actually used
1471 * @buf: where to get the data from
1472 * @count: bytes sent
1473 * @ppos: where to start
1474 *
1475 * Returns number of bytes written or error code, as appropriate
1476 */
1477static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1478				size_t count, loff_t *ppos)
1479{
1480	struct smack_known *skp;
1481	char temp[80];
1482	int i;
1483
1484	if (!smack_privileged(CAP_MAC_ADMIN))
1485		return -EPERM;
1486
1487	if (count >= sizeof(temp) || count == 0)
1488		return -EINVAL;
1489
1490	if (copy_from_user(temp, buf, count) != 0)
1491		return -EFAULT;
1492
1493	temp[count] = '\0';
1494
1495	if (sscanf(temp, "%d", &i) != 1)
1496		return -EINVAL;
1497
1498	/*
1499	 * Don't do anything if the value hasn't actually changed.
1500	 * If it is changing reset the level on entries that were
1501	 * set up to be mapped when they were created.
1502	 */
1503	if (smack_cipso_mapped != i) {
1504		mutex_lock(&smack_known_lock);
1505		list_for_each_entry_rcu(skp, &smack_known_list, list)
1506			if (skp->smk_netlabel.attr.mls.lvl ==
1507			    smack_cipso_mapped)
1508				skp->smk_netlabel.attr.mls.lvl = i;
1509		smack_cipso_mapped = i;
1510		mutex_unlock(&smack_known_lock);
1511	}
1512
1513	return count;
1514}
1515
1516static const struct file_operations smk_mapped_ops = {
1517	.read		= smk_read_mapped,
1518	.write		= smk_write_mapped,
1519	.llseek		= default_llseek,
1520};
1521
1522/**
1523 * smk_read_ambient - read() for /smack/ambient
1524 * @filp: file pointer, not actually used
1525 * @buf: where to put the result
1526 * @cn: maximum to send along
1527 * @ppos: where to start
1528 *
1529 * Returns number of bytes read or error code, as appropriate
1530 */
1531static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1532				size_t cn, loff_t *ppos)
1533{
1534	ssize_t rc;
1535	int asize;
1536
1537	if (*ppos != 0)
1538		return 0;
1539	/*
1540	 * Being careful to avoid a problem in the case where
1541	 * smack_net_ambient gets changed in midstream.
1542	 */
1543	mutex_lock(&smack_ambient_lock);
1544
1545	asize = strlen(smack_net_ambient->smk_known) + 1;
1546
1547	if (cn >= asize)
1548		rc = simple_read_from_buffer(buf, cn, ppos,
1549					     smack_net_ambient->smk_known,
1550					     asize);
1551	else
1552		rc = -EINVAL;
1553
1554	mutex_unlock(&smack_ambient_lock);
1555
1556	return rc;
1557}
1558
1559/**
1560 * smk_write_ambient - write() for /smack/ambient
1561 * @file: file pointer, not actually used
1562 * @buf: where to get the data from
1563 * @count: bytes sent
1564 * @ppos: where to start
1565 *
1566 * Returns number of bytes written or error code, as appropriate
1567 */
1568static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1569				 size_t count, loff_t *ppos)
1570{
1571	struct smack_known *skp;
1572	char *oldambient;
 
1573	char *data;
1574	int rc = count;
1575
1576	if (!smack_privileged(CAP_MAC_ADMIN))
1577		return -EPERM;
1578
1579	data = kzalloc(count + 1, GFP_KERNEL);
1580	if (data == NULL)
1581		return -ENOMEM;
1582
1583	if (copy_from_user(data, buf, count) != 0) {
1584		rc = -EFAULT;
1585		goto out;
1586	}
1587
1588	skp = smk_import_entry(data, count);
1589	if (skp == NULL) {
1590		rc = -EINVAL;
1591		goto out;
1592	}
1593
1594	mutex_lock(&smack_ambient_lock);
1595
1596	oldambient = smack_net_ambient->smk_known;
1597	smack_net_ambient = skp;
1598	smk_unlbl_ambient(oldambient);
1599
1600	mutex_unlock(&smack_ambient_lock);
1601
1602out:
1603	kfree(data);
1604	return rc;
1605}
1606
1607static const struct file_operations smk_ambient_ops = {
1608	.read		= smk_read_ambient,
1609	.write		= smk_write_ambient,
1610	.llseek		= default_llseek,
1611};
1612
1613/**
1614 * smk_read_onlycap - read() for smackfs/onlycap
1615 * @filp: file pointer, not actually used
1616 * @buf: where to put the result
1617 * @cn: maximum to send along
1618 * @ppos: where to start
1619 *
1620 * Returns number of bytes read or error code, as appropriate
1621 */
1622static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1623				size_t cn, loff_t *ppos)
1624{
1625	char *smack = "";
1626	ssize_t rc = -EINVAL;
1627	int asize;
1628
1629	if (*ppos != 0)
1630		return 0;
1631
1632	if (smack_onlycap != NULL)
1633		smack = smack_onlycap->smk_known;
1634
1635	asize = strlen(smack) + 1;
1636
1637	if (cn >= asize)
1638		rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1639
1640	return rc;
1641}
1642
1643/**
1644 * smk_write_onlycap - write() for smackfs/onlycap
1645 * @file: file pointer, not actually used
1646 * @buf: where to get the data from
1647 * @count: bytes sent
1648 * @ppos: where to start
1649 *
1650 * Returns number of bytes written or error code, as appropriate
1651 */
1652static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1653				 size_t count, loff_t *ppos)
1654{
1655	char *data;
1656	struct smack_known *skp = smk_of_task(current->cred->security);
1657	int rc = count;
1658
1659	if (!smack_privileged(CAP_MAC_ADMIN))
1660		return -EPERM;
1661
1662	/*
1663	 * This can be done using smk_access() but is done
1664	 * explicitly for clarity. The smk_access() implementation
1665	 * would use smk_access(smack_onlycap, MAY_WRITE)
1666	 */
1667	if (smack_onlycap != NULL && smack_onlycap != skp)
1668		return -EPERM;
1669
1670	data = kzalloc(count, GFP_KERNEL);
1671	if (data == NULL)
1672		return -ENOMEM;
1673
1674	/*
1675	 * Should the null string be passed in unset the onlycap value.
1676	 * This seems like something to be careful with as usually
1677	 * smk_import only expects to return NULL for errors. It
1678	 * is usually the case that a nullstring or "\n" would be
1679	 * bad to pass to smk_import but in fact this is useful here.
1680	 *
1681	 * smk_import will also reject a label beginning with '-',
1682	 * so "-usecapabilities" will also work.
1683	 */
1684	if (copy_from_user(data, buf, count) != 0)
1685		rc = -EFAULT;
1686	else
1687		smack_onlycap = smk_import_entry(data, count);
1688
1689	kfree(data);
1690	return rc;
1691}
1692
1693static const struct file_operations smk_onlycap_ops = {
1694	.read		= smk_read_onlycap,
1695	.write		= smk_write_onlycap,
1696	.llseek		= default_llseek,
1697};
1698
1699/**
1700 * smk_read_logging - read() for /smack/logging
1701 * @filp: file pointer, not actually used
1702 * @buf: where to put the result
1703 * @cn: maximum to send along
1704 * @ppos: where to start
1705 *
1706 * Returns number of bytes read or error code, as appropriate
1707 */
1708static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1709				size_t count, loff_t *ppos)
1710{
1711	char temp[32];
1712	ssize_t rc;
1713
1714	if (*ppos != 0)
1715		return 0;
1716
1717	sprintf(temp, "%d\n", log_policy);
1718	rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1719	return rc;
1720}
1721
1722/**
1723 * smk_write_logging - write() for /smack/logging
1724 * @file: file pointer, not actually used
1725 * @buf: where to get the data from
1726 * @count: bytes sent
1727 * @ppos: where to start
1728 *
1729 * Returns number of bytes written or error code, as appropriate
1730 */
1731static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1732				size_t count, loff_t *ppos)
1733{
1734	char temp[32];
1735	int i;
1736
1737	if (!smack_privileged(CAP_MAC_ADMIN))
1738		return -EPERM;
1739
1740	if (count >= sizeof(temp) || count == 0)
1741		return -EINVAL;
1742
1743	if (copy_from_user(temp, buf, count) != 0)
1744		return -EFAULT;
1745
1746	temp[count] = '\0';
1747
1748	if (sscanf(temp, "%d", &i) != 1)
1749		return -EINVAL;
1750	if (i < 0 || i > 3)
1751		return -EINVAL;
1752	log_policy = i;
1753	return count;
1754}
1755
1756
1757
1758static const struct file_operations smk_logging_ops = {
1759	.read		= smk_read_logging,
1760	.write		= smk_write_logging,
1761	.llseek		= default_llseek,
1762};
1763
1764/*
1765 * Seq_file read operations for /smack/load-self
1766 */
1767
1768static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1769{
1770	struct task_smack *tsp = current_security();
1771
1772	return smk_seq_start(s, pos, &tsp->smk_rules);
1773}
1774
1775static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1776{
1777	struct task_smack *tsp = current_security();
1778
1779	return smk_seq_next(s, v, pos, &tsp->smk_rules);
1780}
1781
1782static int load_self_seq_show(struct seq_file *s, void *v)
1783{
1784	struct list_head *list = v;
1785	struct smack_rule *srp =
1786		 list_entry(list, struct smack_rule, list);
1787
1788	smk_rule_show(s, srp, SMK_LABELLEN);
1789
1790	return 0;
1791}
1792
1793static const struct seq_operations load_self_seq_ops = {
1794	.start = load_self_seq_start,
1795	.next  = load_self_seq_next,
1796	.show  = load_self_seq_show,
1797	.stop  = smk_seq_stop,
1798};
1799
1800
1801/**
1802 * smk_open_load_self - open() for /smack/load-self2
1803 * @inode: inode structure representing file
1804 * @file: "load" file pointer
1805 *
1806 * For reading, use load_seq_* seq_file reading operations.
1807 */
1808static int smk_open_load_self(struct inode *inode, struct file *file)
1809{
1810	return seq_open(file, &load_self_seq_ops);
1811}
1812
1813/**
1814 * smk_write_load_self - write() for /smack/load-self
1815 * @file: file pointer, not actually used
1816 * @buf: where to get the data from
1817 * @count: bytes sent
1818 * @ppos: where to start - must be 0
1819 *
1820 */
1821static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1822			      size_t count, loff_t *ppos)
1823{
1824	struct task_smack *tsp = current_security();
1825
1826	return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1827				    &tsp->smk_rules_lock, SMK_FIXED24_FMT);
1828}
1829
1830static const struct file_operations smk_load_self_ops = {
1831	.open           = smk_open_load_self,
1832	.read		= seq_read,
1833	.llseek         = seq_lseek,
1834	.write		= smk_write_load_self,
1835	.release        = seq_release,
1836};
1837
1838/**
1839 * smk_user_access - handle access check transaction
1840 * @file: file pointer
1841 * @buf: data from user space
1842 * @count: bytes sent
1843 * @ppos: where to start - must be 0
1844 */
1845static ssize_t smk_user_access(struct file *file, const char __user *buf,
1846				size_t count, loff_t *ppos, int format)
1847{
1848	struct smack_parsed_rule rule;
1849	char *data;
 
1850	int res;
1851
1852	data = simple_transaction_get(file, buf, count);
1853	if (IS_ERR(data))
1854		return PTR_ERR(data);
1855
1856	if (format == SMK_FIXED24_FMT) {
1857		if (count < SMK_LOADLEN)
1858			return -EINVAL;
1859		res = smk_parse_rule(data, &rule, 0);
1860	} else {
1861		/*
1862		 * simple_transaction_get() returns null-terminated data
1863		 */
1864		res = smk_parse_long_rule(data, &rule, 0, 3);
 
 
 
 
 
 
1865	}
1866
1867	if (res >= 0)
1868		res = smk_access(rule.smk_subject, rule.smk_object,
1869				 rule.smk_access1, NULL);
1870	else if (res != -ENOENT)
1871		return -EINVAL;
1872
 
 
1873	data[0] = res == 0 ? '1' : '0';
1874	data[1] = '\0';
1875
1876	simple_transaction_set(file, 2);
1877
1878	if (format == SMK_FIXED24_FMT)
1879		return SMK_LOADLEN;
1880	return count;
1881}
1882
1883/**
1884 * smk_write_access - handle access check transaction
1885 * @file: file pointer
1886 * @buf: data from user space
1887 * @count: bytes sent
1888 * @ppos: where to start - must be 0
1889 */
1890static ssize_t smk_write_access(struct file *file, const char __user *buf,
1891				size_t count, loff_t *ppos)
1892{
1893	return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
1894}
1895
1896static const struct file_operations smk_access_ops = {
1897	.write		= smk_write_access,
1898	.read		= simple_transaction_read,
1899	.release	= simple_transaction_release,
1900	.llseek		= generic_file_llseek,
1901};
1902
1903
1904/*
1905 * Seq_file read operations for /smack/load2
1906 */
1907
1908static int load2_seq_show(struct seq_file *s, void *v)
1909{
1910	struct list_head *list = v;
1911	struct smack_master_list *smlp =
1912		 list_entry(list, struct smack_master_list, list);
1913
1914	smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
1915
1916	return 0;
1917}
1918
1919static const struct seq_operations load2_seq_ops = {
1920	.start = load2_seq_start,
1921	.next  = load2_seq_next,
1922	.show  = load2_seq_show,
1923	.stop  = smk_seq_stop,
1924};
1925
1926/**
1927 * smk_open_load2 - open() for /smack/load2
1928 * @inode: inode structure representing file
1929 * @file: "load2" file pointer
1930 *
1931 * For reading, use load2_seq_* seq_file reading operations.
1932 */
1933static int smk_open_load2(struct inode *inode, struct file *file)
1934{
1935	return seq_open(file, &load2_seq_ops);
1936}
1937
1938/**
1939 * smk_write_load2 - write() for /smack/load2
1940 * @file: file pointer, not actually used
1941 * @buf: where to get the data from
1942 * @count: bytes sent
1943 * @ppos: where to start - must be 0
1944 *
1945 */
1946static ssize_t smk_write_load2(struct file *file, const char __user *buf,
1947				size_t count, loff_t *ppos)
1948{
1949	/*
1950	 * Must have privilege.
1951	 */
1952	if (!smack_privileged(CAP_MAC_ADMIN))
1953		return -EPERM;
1954
1955	return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
1956				    SMK_LONG_FMT);
1957}
1958
1959static const struct file_operations smk_load2_ops = {
1960	.open           = smk_open_load2,
1961	.read		= seq_read,
1962	.llseek         = seq_lseek,
1963	.write		= smk_write_load2,
1964	.release        = seq_release,
1965};
1966
1967/*
1968 * Seq_file read operations for /smack/load-self2
1969 */
1970
1971static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
1972{
1973	struct task_smack *tsp = current_security();
1974
1975	return smk_seq_start(s, pos, &tsp->smk_rules);
1976}
1977
1978static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
1979{
1980	struct task_smack *tsp = current_security();
1981
1982	return smk_seq_next(s, v, pos, &tsp->smk_rules);
1983}
1984
1985static int load_self2_seq_show(struct seq_file *s, void *v)
1986{
1987	struct list_head *list = v;
1988	struct smack_rule *srp =
1989		 list_entry(list, struct smack_rule, list);
1990
1991	smk_rule_show(s, srp, SMK_LONGLABEL);
1992
1993	return 0;
1994}
1995
1996static const struct seq_operations load_self2_seq_ops = {
1997	.start = load_self2_seq_start,
1998	.next  = load_self2_seq_next,
1999	.show  = load_self2_seq_show,
2000	.stop  = smk_seq_stop,
2001};
2002
2003/**
2004 * smk_open_load_self2 - open() for /smack/load-self2
2005 * @inode: inode structure representing file
2006 * @file: "load" file pointer
2007 *
2008 * For reading, use load_seq_* seq_file reading operations.
2009 */
2010static int smk_open_load_self2(struct inode *inode, struct file *file)
2011{
2012	return seq_open(file, &load_self2_seq_ops);
2013}
2014
2015/**
2016 * smk_write_load_self2 - write() for /smack/load-self2
2017 * @file: file pointer, not actually used
2018 * @buf: where to get the data from
2019 * @count: bytes sent
2020 * @ppos: where to start - must be 0
2021 *
2022 */
2023static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2024			      size_t count, loff_t *ppos)
2025{
2026	struct task_smack *tsp = current_security();
2027
2028	return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2029				    &tsp->smk_rules_lock, SMK_LONG_FMT);
2030}
2031
2032static const struct file_operations smk_load_self2_ops = {
2033	.open           = smk_open_load_self2,
2034	.read		= seq_read,
2035	.llseek         = seq_lseek,
2036	.write		= smk_write_load_self2,
2037	.release        = seq_release,
2038};
2039
2040/**
2041 * smk_write_access2 - handle access check transaction
2042 * @file: file pointer
2043 * @buf: data from user space
2044 * @count: bytes sent
2045 * @ppos: where to start - must be 0
2046 */
2047static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2048					size_t count, loff_t *ppos)
2049{
2050	return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2051}
2052
2053static const struct file_operations smk_access2_ops = {
2054	.write		= smk_write_access2,
2055	.read		= simple_transaction_read,
2056	.release	= simple_transaction_release,
2057	.llseek		= generic_file_llseek,
2058};
2059
2060/**
2061 * smk_write_revoke_subj - write() for /smack/revoke-subject
2062 * @file: file pointer
2063 * @buf: data from user space
2064 * @count: bytes sent
2065 * @ppos: where to start - must be 0
2066 */
2067static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2068				size_t count, loff_t *ppos)
2069{
2070	char *data = NULL;
2071	const char *cp = NULL;
2072	struct smack_known *skp;
2073	struct smack_rule *sp;
2074	struct list_head *rule_list;
2075	struct mutex *rule_lock;
2076	int rc = count;
2077
2078	if (*ppos != 0)
2079		return -EINVAL;
2080
2081	if (!smack_privileged(CAP_MAC_ADMIN))
2082		return -EPERM;
2083
2084	if (count == 0 || count > SMK_LONGLABEL)
2085		return -EINVAL;
2086
2087	data = kzalloc(count, GFP_KERNEL);
2088	if (data == NULL)
2089		return -ENOMEM;
2090
2091	if (copy_from_user(data, buf, count) != 0) {
2092		rc = -EFAULT;
2093		goto free_out;
2094	}
2095
2096	cp = smk_parse_smack(data, count);
2097	if (cp == NULL) {
2098		rc = -EINVAL;
2099		goto free_out;
2100	}
2101
2102	skp = smk_find_entry(cp);
2103	if (skp == NULL)
2104		goto free_out;
2105
2106	rule_list = &skp->smk_rules;
2107	rule_lock = &skp->smk_rules_lock;
2108
2109	mutex_lock(rule_lock);
2110
2111	list_for_each_entry_rcu(sp, rule_list, list)
2112		sp->smk_access = 0;
2113
2114	mutex_unlock(rule_lock);
2115
2116free_out:
2117	kfree(data);
2118	kfree(cp);
2119	return rc;
2120}
2121
2122static const struct file_operations smk_revoke_subj_ops = {
2123	.write		= smk_write_revoke_subj,
2124	.read		= simple_transaction_read,
2125	.release	= simple_transaction_release,
2126	.llseek		= generic_file_llseek,
2127};
2128
2129static struct kset *smackfs_kset;
2130/**
2131 * smk_init_sysfs - initialize /sys/fs/smackfs
2132 *
2133 */
2134static int smk_init_sysfs(void)
2135{
2136	smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj);
2137	if (!smackfs_kset)
2138		return -ENOMEM;
2139	return 0;
2140}
2141
2142/**
2143 * smk_write_change_rule - write() for /smack/change-rule
2144 * @file: file pointer
2145 * @buf: data from user space
2146 * @count: bytes sent
2147 * @ppos: where to start - must be 0
2148 */
2149static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2150				size_t count, loff_t *ppos)
2151{
2152	/*
2153	 * Must have privilege.
2154	 */
2155	if (!smack_privileged(CAP_MAC_ADMIN))
2156		return -EPERM;
2157
2158	return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2159				    SMK_CHANGE_FMT);
2160}
2161
2162static const struct file_operations smk_change_rule_ops = {
2163	.write		= smk_write_change_rule,
2164	.read		= simple_transaction_read,
2165	.release	= simple_transaction_release,
2166	.llseek		= generic_file_llseek,
2167};
2168
2169/**
2170 * smk_read_syslog - read() for smackfs/syslog
2171 * @filp: file pointer, not actually used
2172 * @buf: where to put the result
2173 * @cn: maximum to send along
2174 * @ppos: where to start
2175 *
2176 * Returns number of bytes read or error code, as appropriate
2177 */
2178static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2179				size_t cn, loff_t *ppos)
2180{
2181	struct smack_known *skp;
2182	ssize_t rc = -EINVAL;
2183	int asize;
2184
2185	if (*ppos != 0)
2186		return 0;
2187
2188	if (smack_syslog_label == NULL)
2189		skp = &smack_known_star;
2190	else
2191		skp = smack_syslog_label;
2192
2193	asize = strlen(skp->smk_known) + 1;
2194
2195	if (cn >= asize)
2196		rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2197						asize);
2198
2199	return rc;
2200}
2201
2202/**
2203 * smk_write_syslog - write() for smackfs/syslog
2204 * @file: file pointer, not actually used
2205 * @buf: where to get the data from
2206 * @count: bytes sent
2207 * @ppos: where to start
2208 *
2209 * Returns number of bytes written or error code, as appropriate
2210 */
2211static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2212				size_t count, loff_t *ppos)
2213{
2214	char *data;
2215	struct smack_known *skp;
2216	int rc = count;
2217
2218	if (!smack_privileged(CAP_MAC_ADMIN))
2219		return -EPERM;
2220
2221	data = kzalloc(count, GFP_KERNEL);
2222	if (data == NULL)
2223		return -ENOMEM;
2224
2225	if (copy_from_user(data, buf, count) != 0)
2226		rc = -EFAULT;
2227	else {
2228		skp = smk_import_entry(data, count);
2229		if (skp == NULL)
2230			rc = -EINVAL;
2231		else
2232			smack_syslog_label = smk_import_entry(data, count);
2233	}
2234
2235	kfree(data);
2236	return rc;
2237}
2238
2239static const struct file_operations smk_syslog_ops = {
2240	.read		= smk_read_syslog,
2241	.write		= smk_write_syslog,
2242	.llseek		= default_llseek,
2243};
2244
2245
2246/**
2247 * smk_fill_super - fill the smackfs superblock
2248 * @sb: the empty superblock
2249 * @data: unused
2250 * @silent: unused
2251 *
2252 * Fill in the well known entries for the smack filesystem
2253 *
2254 * Returns 0 on success, an error code on failure
2255 */
2256static int smk_fill_super(struct super_block *sb, void *data, int silent)
2257{
2258	int rc;
2259	struct inode *root_inode;
2260
2261	static struct tree_descr smack_files[] = {
2262		[SMK_LOAD] = {
2263			"load", &smk_load_ops, S_IRUGO|S_IWUSR},
2264		[SMK_CIPSO] = {
2265			"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2266		[SMK_DOI] = {
2267			"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2268		[SMK_DIRECT] = {
2269			"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2270		[SMK_AMBIENT] = {
2271			"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2272		[SMK_NETLBLADDR] = {
2273			"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
2274		[SMK_ONLYCAP] = {
2275			"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2276		[SMK_LOGGING] = {
2277			"logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2278		[SMK_LOAD_SELF] = {
2279			"load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2280		[SMK_ACCESSES] = {
2281			"access", &smk_access_ops, S_IRUGO|S_IWUGO},
2282		[SMK_MAPPED] = {
2283			"mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2284		[SMK_LOAD2] = {
2285			"load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2286		[SMK_LOAD_SELF2] = {
2287			"load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2288		[SMK_ACCESS2] = {
2289			"access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2290		[SMK_CIPSO2] = {
2291			"cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2292		[SMK_REVOKE_SUBJ] = {
2293			"revoke-subject", &smk_revoke_subj_ops,
2294			S_IRUGO|S_IWUSR},
2295		[SMK_CHANGE_RULE] = {
2296			"change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2297		[SMK_SYSLOG] = {
2298			"syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2299		/* last one */
2300			{""}
2301	};
2302
2303	rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2304	if (rc != 0) {
2305		printk(KERN_ERR "%s failed %d while creating inodes\n",
2306			__func__, rc);
2307		return rc;
2308	}
2309
2310	root_inode = sb->s_root->d_inode;
 
2311
2312	return 0;
2313}
2314
2315/**
2316 * smk_mount - get the smackfs superblock
2317 * @fs_type: passed along without comment
2318 * @flags: passed along without comment
2319 * @dev_name: passed along without comment
2320 * @data: passed along without comment
2321 *
2322 * Just passes everything along.
2323 *
2324 * Returns what the lower level code does.
2325 */
2326static struct dentry *smk_mount(struct file_system_type *fs_type,
2327		      int flags, const char *dev_name, void *data)
2328{
2329	return mount_single(fs_type, flags, data, smk_fill_super);
2330}
2331
2332static struct file_system_type smk_fs_type = {
2333	.name		= "smackfs",
2334	.mount		= smk_mount,
2335	.kill_sb	= kill_litter_super,
2336};
2337
2338static struct vfsmount *smackfs_mount;
2339
2340static int __init smk_preset_netlabel(struct smack_known *skp)
2341{
2342	skp->smk_netlabel.domain = skp->smk_known;
2343	skp->smk_netlabel.flags =
2344		NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2345	return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2346				&skp->smk_netlabel, strlen(skp->smk_known));
2347}
2348
2349/**
2350 * init_smk_fs - get the smackfs superblock
2351 *
2352 * register the smackfs
2353 *
2354 * Do not register smackfs if Smack wasn't enabled
2355 * on boot. We can not put this method normally under the
2356 * smack_init() code path since the security subsystem get
2357 * initialized before the vfs caches.
2358 *
2359 * Returns true if we were not chosen on boot or if
2360 * we were chosen and filesystem registration succeeded.
2361 */
2362static int __init init_smk_fs(void)
2363{
2364	int err;
2365	int rc;
2366
2367	if (!security_module_enable(&smack_ops))
2368		return 0;
2369
2370	err = smk_init_sysfs();
2371	if (err)
2372		printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2373
2374	err = register_filesystem(&smk_fs_type);
2375	if (!err) {
2376		smackfs_mount = kern_mount(&smk_fs_type);
2377		if (IS_ERR(smackfs_mount)) {
2378			printk(KERN_ERR "smackfs:  could not mount!\n");
2379			err = PTR_ERR(smackfs_mount);
2380			smackfs_mount = NULL;
2381		}
2382	}
2383
2384	smk_cipso_doi();
2385	smk_unlbl_ambient(NULL);
2386
2387	rc = smk_preset_netlabel(&smack_known_floor);
2388	if (err == 0 && rc < 0)
2389		err = rc;
2390	rc = smk_preset_netlabel(&smack_known_hat);
2391	if (err == 0 && rc < 0)
2392		err = rc;
2393	rc = smk_preset_netlabel(&smack_known_huh);
2394	if (err == 0 && rc < 0)
2395		err = rc;
2396	rc = smk_preset_netlabel(&smack_known_invalid);
2397	if (err == 0 && rc < 0)
2398		err = rc;
2399	rc = smk_preset_netlabel(&smack_known_star);
2400	if (err == 0 && rc < 0)
2401		err = rc;
2402	rc = smk_preset_netlabel(&smack_known_web);
2403	if (err == 0 && rc < 0)
2404		err = rc;
2405
2406	return err;
2407}
2408
2409__initcall(init_smk_fs);