linux/security/smack/smackfs.c
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   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#define BEBITS  (sizeof(__be32) * 8)
  33/*
  34 * smackfs pseudo filesystem.
  35 */
  36
  37enum smk_inos {
  38        SMK_ROOT_INO    = 2,
  39        SMK_LOAD        = 3,    /* load policy */
  40        SMK_CIPSO       = 4,    /* load label -> CIPSO mapping */
  41        SMK_DOI         = 5,    /* CIPSO DOI */
  42        SMK_DIRECT      = 6,    /* CIPSO level indicating direct label */
  43        SMK_AMBIENT     = 7,    /* internet ambient label */
  44        SMK_NET4ADDR    = 8,    /* single label hosts */
  45        SMK_ONLYCAP     = 9,    /* the only "capable" label */
  46        SMK_LOGGING     = 10,   /* logging */
  47        SMK_LOAD_SELF   = 11,   /* task specific rules */
  48        SMK_ACCESSES    = 12,   /* access policy */
  49        SMK_MAPPED      = 13,   /* CIPSO level indicating mapped label */
  50        SMK_LOAD2       = 14,   /* load policy with long labels */
  51        SMK_LOAD_SELF2  = 15,   /* load task specific rules with long labels */
  52        SMK_ACCESS2     = 16,   /* make an access check with long labels */
  53        SMK_CIPSO2      = 17,   /* load long label -> CIPSO mapping */
  54        SMK_REVOKE_SUBJ = 18,   /* set rules with subject label to '-' */
  55        SMK_CHANGE_RULE = 19,   /* change or add rules (long labels) */
  56        SMK_SYSLOG      = 20,   /* change syslog label) */
  57        SMK_PTRACE      = 21,   /* set ptrace rule */
  58#ifdef CONFIG_SECURITY_SMACK_BRINGUP
  59        SMK_UNCONFINED  = 22,   /* define an unconfined label */
  60#endif
  61#if IS_ENABLED(CONFIG_IPV6)
  62        SMK_NET6ADDR    = 23,   /* single label IPv6 hosts */
  63#endif /* CONFIG_IPV6 */
  64        SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
  65};
  66
  67/*
  68 * List locks
  69 */
  70static DEFINE_MUTEX(smack_cipso_lock);
  71static DEFINE_MUTEX(smack_ambient_lock);
  72static DEFINE_MUTEX(smk_net4addr_lock);
  73#if IS_ENABLED(CONFIG_IPV6)
  74static DEFINE_MUTEX(smk_net6addr_lock);
  75#endif /* CONFIG_IPV6 */
  76
  77/*
  78 * This is the "ambient" label for network traffic.
  79 * If it isn't somehow marked, use this.
  80 * It can be reset via smackfs/ambient
  81 */
  82struct smack_known *smack_net_ambient;
  83
  84/*
  85 * This is the level in a CIPSO header that indicates a
  86 * smack label is contained directly in the category set.
  87 * It can be reset via smackfs/direct
  88 */
  89int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
  90
  91/*
  92 * This is the level in a CIPSO header that indicates a
  93 * secid is contained directly in the category set.
  94 * It can be reset via smackfs/mapped
  95 */
  96int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
  97
  98#ifdef CONFIG_SECURITY_SMACK_BRINGUP
  99/*
 100 * Allow one label to be unconfined. This is for
 101 * debugging and application bring-up purposes only.
 102 * It is bad and wrong, but everyone seems to expect
 103 * to have it.
 104 */
 105struct smack_known *smack_unconfined;
 106#endif
 107
 108/*
 109 * If this value is set restrict syslog use to the label specified.
 110 * It can be reset via smackfs/syslog
 111 */
 112struct smack_known *smack_syslog_label;
 113
 114/*
 115 * Ptrace current rule
 116 * SMACK_PTRACE_DEFAULT    regular smack ptrace rules (/proc based)
 117 * SMACK_PTRACE_EXACT      labels must match, but can be overriden with
 118 *                         CAP_SYS_PTRACE
 119 * SMACK_PTRACE_DRACONIAN  lables must match, CAP_SYS_PTRACE has no effect
 120 */
 121int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
 122
 123/*
 124 * Certain IP addresses may be designated as single label hosts.
 125 * Packets are sent there unlabeled, but only from tasks that
 126 * can write to the specified label.
 127 */
 128
 129LIST_HEAD(smk_net4addr_list);
 130#if IS_ENABLED(CONFIG_IPV6)
 131LIST_HEAD(smk_net6addr_list);
 132#endif /* CONFIG_IPV6 */
 133
 134/*
 135 * Rule lists are maintained for each label.
 136 * This master list is just for reading /smack/load and /smack/load2.
 137 */
 138struct smack_master_list {
 139        struct list_head        list;
 140        struct smack_rule       *smk_rule;
 141};
 142
 143static LIST_HEAD(smack_rule_list);
 144
 145struct smack_parsed_rule {
 146        struct smack_known      *smk_subject;
 147        struct smack_known      *smk_object;
 148        int                     smk_access1;
 149        int                     smk_access2;
 150};
 151
 152static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
 153
 154/*
 155 * Values for parsing cipso rules
 156 * SMK_DIGITLEN: Length of a digit field in a rule.
 157 * SMK_CIPSOMIN: Minimum possible cipso rule length.
 158 * SMK_CIPSOMAX: Maximum possible cipso rule length.
 159 */
 160#define SMK_DIGITLEN 4
 161#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
 162#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
 163
 164/*
 165 * Values for parsing MAC rules
 166 * SMK_ACCESS: Maximum possible combination of access permissions
 167 * SMK_ACCESSLEN: Maximum length for a rule access field
 168 * SMK_LOADLEN: Smack rule length
 169 */
 170#define SMK_OACCESS     "rwxa"
 171#define SMK_ACCESS      "rwxatl"
 172#define SMK_OACCESSLEN  (sizeof(SMK_OACCESS) - 1)
 173#define SMK_ACCESSLEN   (sizeof(SMK_ACCESS) - 1)
 174#define SMK_OLOADLEN    (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
 175#define SMK_LOADLEN     (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
 176
 177/*
 178 * Stricly for CIPSO level manipulation.
 179 * Set the category bit number in a smack label sized buffer.
 180 */
 181static inline void smack_catset_bit(unsigned int cat, char *catsetp)
 182{
 183        if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
 184                return;
 185
 186        catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
 187}
 188
 189/**
 190 * smk_netlabel_audit_set - fill a netlbl_audit struct
 191 * @nap: structure to fill
 192 */
 193static void smk_netlabel_audit_set(struct netlbl_audit *nap)
 194{
 195        struct smack_known *skp = smk_of_current();
 196
 197        nap->loginuid = audit_get_loginuid(current);
 198        nap->sessionid = audit_get_sessionid(current);
 199        nap->secid = skp->smk_secid;
 200}
 201
 202/*
 203 * Value for parsing single label host rules
 204 * "1.2.3.4 X"
 205 */
 206#define SMK_NETLBLADDRMIN       9
 207
 208/**
 209 * smk_set_access - add a rule to the rule list or replace an old rule
 210 * @srp: the rule to add or replace
 211 * @rule_list: the list of rules
 212 * @rule_lock: the rule list lock
 213 * @global: if non-zero, indicates a global rule
 214 *
 215 * Looks through the current subject/object/access list for
 216 * the subject/object pair and replaces the access that was
 217 * there. If the pair isn't found add it with the specified
 218 * access.
 219 *
 220 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
 221 * during the allocation of the new pair to add.
 222 */
 223static int smk_set_access(struct smack_parsed_rule *srp,
 224                                struct list_head *rule_list,
 225                                struct mutex *rule_lock, int global)
 226{
 227        struct smack_rule *sp;
 228        struct smack_master_list *smlp;
 229        int found = 0;
 230        int rc = 0;
 231
 232        mutex_lock(rule_lock);
 233
 234        /*
 235         * Because the object label is less likely to match
 236         * than the subject label check it first
 237         */
 238        list_for_each_entry_rcu(sp, rule_list, list) {
 239                if (sp->smk_object == srp->smk_object &&
 240                    sp->smk_subject == srp->smk_subject) {
 241                        found = 1;
 242                        sp->smk_access |= srp->smk_access1;
 243                        sp->smk_access &= ~srp->smk_access2;
 244                        break;
 245                }
 246        }
 247
 248        if (found == 0) {
 249                sp = kzalloc(sizeof(*sp), GFP_KERNEL);
 250                if (sp == NULL) {
 251                        rc = -ENOMEM;
 252                        goto out;
 253                }
 254
 255                sp->smk_subject = srp->smk_subject;
 256                sp->smk_object = srp->smk_object;
 257                sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
 258
 259                list_add_rcu(&sp->list, rule_list);
 260                /*
 261                 * If this is a global as opposed to self and a new rule
 262                 * it needs to get added for reporting.
 263                 */
 264                if (global) {
 265                        smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
 266                        if (smlp != NULL) {
 267                                smlp->smk_rule = sp;
 268                                list_add_rcu(&smlp->list, &smack_rule_list);
 269                        } else
 270                                rc = -ENOMEM;
 271                }
 272        }
 273
 274out:
 275        mutex_unlock(rule_lock);
 276        return rc;
 277}
 278
 279/**
 280 * smk_perm_from_str - parse smack accesses from a text string
 281 * @string: a text string that contains a Smack accesses code
 282 *
 283 * Returns an integer with respective bits set for specified accesses.
 284 */
 285static int smk_perm_from_str(const char *string)
 286{
 287        int perm = 0;
 288        const char *cp;
 289
 290        for (cp = string; ; cp++)
 291                switch (*cp) {
 292                case '-':
 293                        break;
 294                case 'r':
 295                case 'R':
 296                        perm |= MAY_READ;
 297                        break;
 298                case 'w':
 299                case 'W':
 300                        perm |= MAY_WRITE;
 301                        break;
 302                case 'x':
 303                case 'X':
 304                        perm |= MAY_EXEC;
 305                        break;
 306                case 'a':
 307                case 'A':
 308                        perm |= MAY_APPEND;
 309                        break;
 310                case 't':
 311                case 'T':
 312                        perm |= MAY_TRANSMUTE;
 313                        break;
 314                case 'l':
 315                case 'L':
 316                        perm |= MAY_LOCK;
 317                        break;
 318                case 'b':
 319                case 'B':
 320                        perm |= MAY_BRINGUP;
 321                        break;
 322                default:
 323                        return perm;
 324                }
 325}
 326
 327/**
 328 * smk_fill_rule - Fill Smack rule from strings
 329 * @subject: subject label string
 330 * @object: object label string
 331 * @access1: access string
 332 * @access2: string with permissions to be removed
 333 * @rule: Smack rule
 334 * @import: if non-zero, import labels
 335 * @len: label length limit
 336 *
 337 * Returns 0 on success, appropriate error code on failure.
 338 */
 339static int smk_fill_rule(const char *subject, const char *object,
 340                                const char *access1, const char *access2,
 341                                struct smack_parsed_rule *rule, int import,
 342                                int len)
 343{
 344        const char *cp;
 345        struct smack_known *skp;
 346
 347        if (import) {
 348                rule->smk_subject = smk_import_entry(subject, len);
 349                if (IS_ERR(rule->smk_subject))
 350                        return PTR_ERR(rule->smk_subject);
 351
 352                rule->smk_object = smk_import_entry(object, len);
 353                if (IS_ERR(rule->smk_object))
 354                        return PTR_ERR(rule->smk_object);
 355        } else {
 356                cp = smk_parse_smack(subject, len);
 357                if (IS_ERR(cp))
 358                        return PTR_ERR(cp);
 359                skp = smk_find_entry(cp);
 360                kfree(cp);
 361                if (skp == NULL)
 362                        return -ENOENT;
 363                rule->smk_subject = skp;
 364
 365                cp = smk_parse_smack(object, len);
 366                if (IS_ERR(cp))
 367                        return PTR_ERR(cp);
 368                skp = smk_find_entry(cp);
 369                kfree(cp);
 370                if (skp == NULL)
 371                        return -ENOENT;
 372                rule->smk_object = skp;
 373        }
 374
 375        rule->smk_access1 = smk_perm_from_str(access1);
 376        if (access2)
 377                rule->smk_access2 = smk_perm_from_str(access2);
 378        else
 379                rule->smk_access2 = ~rule->smk_access1;
 380
 381        return 0;
 382}
 383
 384/**
 385 * smk_parse_rule - parse Smack rule from load string
 386 * @data: string to be parsed whose size is SMK_LOADLEN
 387 * @rule: Smack rule
 388 * @import: if non-zero, import labels
 389 *
 390 * Returns 0 on success, -1 on errors.
 391 */
 392static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
 393                                int import)
 394{
 395        int rc;
 396
 397        rc = smk_fill_rule(data, data + SMK_LABELLEN,
 398                           data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
 399                           import, SMK_LABELLEN);
 400        return rc;
 401}
 402
 403/**
 404 * smk_parse_long_rule - parse Smack rule from rule string
 405 * @data: string to be parsed, null terminated
 406 * @rule: Will be filled with Smack parsed rule
 407 * @import: if non-zero, import labels
 408 * @tokens: numer of substrings expected in data
 409 *
 410 * Returns number of processed bytes on success, -ERRNO on failure.
 411 */
 412static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
 413                                int import, int tokens)
 414{
 415        ssize_t cnt = 0;
 416        char *tok[4];
 417        int rc;
 418        int i;
 419
 420        /*
 421         * Parsing the rule in-place, filling all white-spaces with '\0'
 422         */
 423        for (i = 0; i < tokens; ++i) {
 424                while (isspace(data[cnt]))
 425                        data[cnt++] = '\0';
 426
 427                if (data[cnt] == '\0')
 428                        /* Unexpected end of data */
 429                        return -EINVAL;
 430
 431                tok[i] = data + cnt;
 432
 433                while (data[cnt] && !isspace(data[cnt]))
 434                        ++cnt;
 435        }
 436        while (isspace(data[cnt]))
 437                data[cnt++] = '\0';
 438
 439        while (i < 4)
 440                tok[i++] = NULL;
 441
 442        rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
 443        return rc == 0 ? cnt : rc;
 444}
 445
 446#define SMK_FIXED24_FMT 0       /* Fixed 24byte label format */
 447#define SMK_LONG_FMT    1       /* Variable long label format */
 448#define SMK_CHANGE_FMT  2       /* Rule modification format */
 449/**
 450 * smk_write_rules_list - write() for any /smack rule file
 451 * @file: file pointer, not actually used
 452 * @buf: where to get the data from
 453 * @count: bytes sent
 454 * @ppos: where to start - must be 0
 455 * @rule_list: the list of rules to write to
 456 * @rule_lock: lock for the rule list
 457 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
 458 *
 459 * Get one smack access rule from above.
 460 * The format for SMK_LONG_FMT is:
 461 *      "subject<whitespace>object<whitespace>access[<whitespace>...]"
 462 * The format for SMK_FIXED24_FMT is exactly:
 463 *      "subject                 object                  rwxat"
 464 * The format for SMK_CHANGE_FMT is:
 465 *      "subject<whitespace>object<whitespace>
 466 *       acc_enable<whitespace>acc_disable[<whitespace>...]"
 467 */
 468static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 469                                        size_t count, loff_t *ppos,
 470                                        struct list_head *rule_list,
 471                                        struct mutex *rule_lock, int format)
 472{
 473        struct smack_parsed_rule rule;
 474        char *data;
 475        int rc;
 476        int trunc = 0;
 477        int tokens;
 478        ssize_t cnt = 0;
 479
 480        /*
 481         * No partial writes.
 482         * Enough data must be present.
 483         */
 484        if (*ppos != 0)
 485                return -EINVAL;
 486
 487        if (format == SMK_FIXED24_FMT) {
 488                /*
 489                 * Minor hack for backward compatibility
 490                 */
 491                if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
 492                        return -EINVAL;
 493        } else {
 494                if (count >= PAGE_SIZE) {
 495                        count = PAGE_SIZE - 1;
 496                        trunc = 1;
 497                }
 498        }
 499
 500        data = memdup_user_nul(buf, count);
 501        if (IS_ERR(data))
 502                return PTR_ERR(data);
 503
 504        /*
 505         * In case of parsing only part of user buf,
 506         * avoid having partial rule at the data buffer
 507         */
 508        if (trunc) {
 509                while (count > 0 && (data[count - 1] != '\n'))
 510                        --count;
 511                if (count == 0) {
 512                        rc = -EINVAL;
 513                        goto out;
 514                }
 515        }
 516
 517        data[count] = '\0';
 518        tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
 519        while (cnt < count) {
 520                if (format == SMK_FIXED24_FMT) {
 521                        rc = smk_parse_rule(data, &rule, 1);
 522                        if (rc < 0)
 523                                goto out;
 524                        cnt = count;
 525                } else {
 526                        rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
 527                        if (rc < 0)
 528                                goto out;
 529                        if (rc == 0) {
 530                                rc = -EINVAL;
 531                                goto out;
 532                        }
 533                        cnt += rc;
 534                }
 535
 536                if (rule_list == NULL)
 537                        rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
 538                                &rule.smk_subject->smk_rules_lock, 1);
 539                else
 540                        rc = smk_set_access(&rule, rule_list, rule_lock, 0);
 541
 542                if (rc)
 543                        goto out;
 544        }
 545
 546        rc = cnt;
 547out:
 548        kfree(data);
 549        return rc;
 550}
 551
 552/*
 553 * Core logic for smackfs seq list operations.
 554 */
 555
 556static void *smk_seq_start(struct seq_file *s, loff_t *pos,
 557                                struct list_head *head)
 558{
 559        struct list_head *list;
 560        int i = *pos;
 561
 562        rcu_read_lock();
 563        for (list = rcu_dereference(list_next_rcu(head));
 564                list != head;
 565                list = rcu_dereference(list_next_rcu(list))) {
 566                if (i-- == 0)
 567                        return list;
 568        }
 569
 570        return NULL;
 571}
 572
 573static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
 574                                struct list_head *head)
 575{
 576        struct list_head *list = v;
 577
 578        ++*pos;
 579        list = rcu_dereference(list_next_rcu(list));
 580
 581        return (list == head) ? NULL : list;
 582}
 583
 584static void smk_seq_stop(struct seq_file *s, void *v)
 585{
 586        rcu_read_unlock();
 587}
 588
 589static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
 590{
 591        /*
 592         * Don't show any rules with label names too long for
 593         * interface file (/smack/load or /smack/load2)
 594         * because you should expect to be able to write
 595         * anything you read back.
 596         */
 597        if (strlen(srp->smk_subject->smk_known) >= max ||
 598            strlen(srp->smk_object->smk_known) >= max)
 599                return;
 600
 601        if (srp->smk_access == 0)
 602                return;
 603
 604        seq_printf(s, "%s %s",
 605                   srp->smk_subject->smk_known,
 606                   srp->smk_object->smk_known);
 607
 608        seq_putc(s, ' ');
 609
 610        if (srp->smk_access & MAY_READ)
 611                seq_putc(s, 'r');
 612        if (srp->smk_access & MAY_WRITE)
 613                seq_putc(s, 'w');
 614        if (srp->smk_access & MAY_EXEC)
 615                seq_putc(s, 'x');
 616        if (srp->smk_access & MAY_APPEND)
 617                seq_putc(s, 'a');
 618        if (srp->smk_access & MAY_TRANSMUTE)
 619                seq_putc(s, 't');
 620        if (srp->smk_access & MAY_LOCK)
 621                seq_putc(s, 'l');
 622        if (srp->smk_access & MAY_BRINGUP)
 623                seq_putc(s, 'b');
 624
 625        seq_putc(s, '\n');
 626}
 627
 628/*
 629 * Seq_file read operations for /smack/load
 630 */
 631
 632static void *load2_seq_start(struct seq_file *s, loff_t *pos)
 633{
 634        return smk_seq_start(s, pos, &smack_rule_list);
 635}
 636
 637static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
 638{
 639        return smk_seq_next(s, v, pos, &smack_rule_list);
 640}
 641
 642static int load_seq_show(struct seq_file *s, void *v)
 643{
 644        struct list_head *list = v;
 645        struct smack_master_list *smlp =
 646                list_entry_rcu(list, struct smack_master_list, list);
 647
 648        smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
 649
 650        return 0;
 651}
 652
 653static const struct seq_operations load_seq_ops = {
 654        .start = load2_seq_start,
 655        .next  = load2_seq_next,
 656        .show  = load_seq_show,
 657        .stop  = smk_seq_stop,
 658};
 659
 660/**
 661 * smk_open_load - open() for /smack/load
 662 * @inode: inode structure representing file
 663 * @file: "load" file pointer
 664 *
 665 * For reading, use load_seq_* seq_file reading operations.
 666 */
 667static int smk_open_load(struct inode *inode, struct file *file)
 668{
 669        return seq_open(file, &load_seq_ops);
 670}
 671
 672/**
 673 * smk_write_load - write() for /smack/load
 674 * @file: file pointer, not actually used
 675 * @buf: where to get the data from
 676 * @count: bytes sent
 677 * @ppos: where to start - must be 0
 678 *
 679 */
 680static ssize_t smk_write_load(struct file *file, const char __user *buf,
 681                              size_t count, loff_t *ppos)
 682{
 683        /*
 684         * Must have privilege.
 685         * No partial writes.
 686         * Enough data must be present.
 687         */
 688        if (!smack_privileged(CAP_MAC_ADMIN))
 689                return -EPERM;
 690
 691        return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
 692                                    SMK_FIXED24_FMT);
 693}
 694
 695static const struct file_operations smk_load_ops = {
 696        .open           = smk_open_load,
 697        .read           = seq_read,
 698        .llseek         = seq_lseek,
 699        .write          = smk_write_load,
 700        .release        = seq_release,
 701};
 702
 703/**
 704 * smk_cipso_doi - initialize the CIPSO domain
 705 */
 706static void smk_cipso_doi(void)
 707{
 708        int rc;
 709        struct cipso_v4_doi *doip;
 710        struct netlbl_audit nai;
 711
 712        smk_netlabel_audit_set(&nai);
 713
 714        rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
 715        if (rc != 0)
 716                printk(KERN_WARNING "%s:%d remove rc = %d\n",
 717                       __func__, __LINE__, rc);
 718
 719        doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
 720        if (doip == NULL)
 721                panic("smack:  Failed to initialize cipso DOI.\n");
 722        doip->map.std = NULL;
 723        doip->doi = smk_cipso_doi_value;
 724        doip->type = CIPSO_V4_MAP_PASS;
 725        doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
 726        for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
 727                doip->tags[rc] = CIPSO_V4_TAG_INVALID;
 728
 729        rc = netlbl_cfg_cipsov4_add(doip, &nai);
 730        if (rc != 0) {
 731                printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
 732                       __func__, __LINE__, rc);
 733                kfree(doip);
 734                return;
 735        }
 736        rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
 737        if (rc != 0) {
 738                printk(KERN_WARNING "%s:%d map add rc = %d\n",
 739                       __func__, __LINE__, rc);
 740                kfree(doip);
 741                return;
 742        }
 743}
 744
 745/**
 746 * smk_unlbl_ambient - initialize the unlabeled domain
 747 * @oldambient: previous domain string
 748 */
 749static void smk_unlbl_ambient(char *oldambient)
 750{
 751        int rc;
 752        struct netlbl_audit nai;
 753
 754        smk_netlabel_audit_set(&nai);
 755
 756        if (oldambient != NULL) {
 757                rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
 758                if (rc != 0)
 759                        printk(KERN_WARNING "%s:%d remove rc = %d\n",
 760                               __func__, __LINE__, rc);
 761        }
 762        if (smack_net_ambient == NULL)
 763                smack_net_ambient = &smack_known_floor;
 764
 765        rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
 766                                      NULL, NULL, &nai);
 767        if (rc != 0)
 768                printk(KERN_WARNING "%s:%d add rc = %d\n",
 769                       __func__, __LINE__, rc);
 770}
 771
 772/*
 773 * Seq_file read operations for /smack/cipso
 774 */
 775
 776static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
 777{
 778        return smk_seq_start(s, pos, &smack_known_list);
 779}
 780
 781static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
 782{
 783        return smk_seq_next(s, v, pos, &smack_known_list);
 784}
 785
 786/*
 787 * Print cipso labels in format:
 788 * label level[/cat[,cat]]
 789 */
 790static int cipso_seq_show(struct seq_file *s, void *v)
 791{
 792        struct list_head  *list = v;
 793        struct smack_known *skp =
 794                list_entry_rcu(list, struct smack_known, list);
 795        struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 796        char sep = '/';
 797        int i;
 798
 799        /*
 800         * Don't show a label that could not have been set using
 801         * /smack/cipso. This is in support of the notion that
 802         * anything read from /smack/cipso ought to be writeable
 803         * to /smack/cipso.
 804         *
 805         * /smack/cipso2 should be used instead.
 806         */
 807        if (strlen(skp->smk_known) >= SMK_LABELLEN)
 808                return 0;
 809
 810        seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 811
 812        for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
 813             i = netlbl_catmap_walk(cmp, i + 1)) {
 814                seq_printf(s, "%c%d", sep, i);
 815                sep = ',';
 816        }
 817
 818        seq_putc(s, '\n');
 819
 820        return 0;
 821}
 822
 823static const struct seq_operations cipso_seq_ops = {
 824        .start = cipso_seq_start,
 825        .next  = cipso_seq_next,
 826        .show  = cipso_seq_show,
 827        .stop  = smk_seq_stop,
 828};
 829
 830/**
 831 * smk_open_cipso - open() for /smack/cipso
 832 * @inode: inode structure representing file
 833 * @file: "cipso" file pointer
 834 *
 835 * Connect our cipso_seq_* operations with /smack/cipso
 836 * file_operations
 837 */
 838static int smk_open_cipso(struct inode *inode, struct file *file)
 839{
 840        return seq_open(file, &cipso_seq_ops);
 841}
 842
 843/**
 844 * smk_set_cipso - do the work for write() for cipso and cipso2
 845 * @file: file pointer, not actually used
 846 * @buf: where to get the data from
 847 * @count: bytes sent
 848 * @ppos: where to start
 849 * @format: /smack/cipso or /smack/cipso2
 850 *
 851 * Accepts only one cipso rule per write call.
 852 * Returns number of bytes written or error code, as appropriate
 853 */
 854static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 855                                size_t count, loff_t *ppos, int format)
 856{
 857        struct smack_known *skp;
 858        struct netlbl_lsm_secattr ncats;
 859        char mapcatset[SMK_CIPSOLEN];
 860        int maplevel;
 861        unsigned int cat;
 862        int catlen;
 863        ssize_t rc = -EINVAL;
 864        char *data = NULL;
 865        char *rule;
 866        int ret;
 867        int i;
 868
 869        /*
 870         * Must have privilege.
 871         * No partial writes.
 872         * Enough data must be present.
 873         */
 874        if (!smack_privileged(CAP_MAC_ADMIN))
 875                return -EPERM;
 876        if (*ppos != 0)
 877                return -EINVAL;
 878        if (format == SMK_FIXED24_FMT &&
 879            (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
 880                return -EINVAL;
 881
 882        data = memdup_user_nul(buf, count);
 883        if (IS_ERR(data))
 884                return PTR_ERR(data);
 885
 886        rule = data;
 887        /*
 888         * Only allow one writer at a time. Writes should be
 889         * quite rare and small in any case.
 890         */
 891        mutex_lock(&smack_cipso_lock);
 892
 893        skp = smk_import_entry(rule, 0);
 894        if (IS_ERR(skp)) {
 895                rc = PTR_ERR(skp);
 896                goto out;
 897        }
 898
 899        if (format == SMK_FIXED24_FMT)
 900                rule += SMK_LABELLEN;
 901        else
 902                rule += strlen(skp->smk_known) + 1;
 903
 904        ret = sscanf(rule, "%d", &maplevel);
 905        if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
 906                goto out;
 907
 908        rule += SMK_DIGITLEN;
 909        ret = sscanf(rule, "%d", &catlen);
 910        if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
 911                goto out;
 912
 913        if (format == SMK_FIXED24_FMT &&
 914            count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
 915                goto out;
 916
 917        memset(mapcatset, 0, sizeof(mapcatset));
 918
 919        for (i = 0; i < catlen; i++) {
 920                rule += SMK_DIGITLEN;
 921                ret = sscanf(rule, "%u", &cat);
 922                if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
 923                        goto out;
 924
 925                smack_catset_bit(cat, mapcatset);
 926        }
 927
 928        rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
 929        if (rc >= 0) {
 930                netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
 931                skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
 932                skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
 933                rc = count;
 934        }
 935
 936out:
 937        mutex_unlock(&smack_cipso_lock);
 938        kfree(data);
 939        return rc;
 940}
 941
 942/**
 943 * smk_write_cipso - write() for /smack/cipso
 944 * @file: file pointer, not actually used
 945 * @buf: where to get the data from
 946 * @count: bytes sent
 947 * @ppos: where to start
 948 *
 949 * Accepts only one cipso rule per write call.
 950 * Returns number of bytes written or error code, as appropriate
 951 */
 952static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
 953                               size_t count, loff_t *ppos)
 954{
 955        return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
 956}
 957
 958static const struct file_operations smk_cipso_ops = {
 959        .open           = smk_open_cipso,
 960        .read           = seq_read,
 961        .llseek         = seq_lseek,
 962        .write          = smk_write_cipso,
 963        .release        = seq_release,
 964};
 965
 966/*
 967 * Seq_file read operations for /smack/cipso2
 968 */
 969
 970/*
 971 * Print cipso labels in format:
 972 * label level[/cat[,cat]]
 973 */
 974static int cipso2_seq_show(struct seq_file *s, void *v)
 975{
 976        struct list_head  *list = v;
 977        struct smack_known *skp =
 978                list_entry_rcu(list, struct smack_known, list);
 979        struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 980        char sep = '/';
 981        int i;
 982
 983        seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 984
 985        for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
 986             i = netlbl_catmap_walk(cmp, i + 1)) {
 987                seq_printf(s, "%c%d", sep, i);
 988                sep = ',';
 989        }
 990
 991        seq_putc(s, '\n');
 992
 993        return 0;
 994}
 995
 996static const struct seq_operations cipso2_seq_ops = {
 997        .start = cipso_seq_start,
 998        .next  = cipso_seq_next,
 999        .show  = cipso2_seq_show,
1000        .stop  = smk_seq_stop,
1001};
1002
1003/**
1004 * smk_open_cipso2 - open() for /smack/cipso2
1005 * @inode: inode structure representing file
1006 * @file: "cipso2" file pointer
1007 *
1008 * Connect our cipso_seq_* operations with /smack/cipso2
1009 * file_operations
1010 */
1011static int smk_open_cipso2(struct inode *inode, struct file *file)
1012{
1013        return seq_open(file, &cipso2_seq_ops);
1014}
1015
1016/**
1017 * smk_write_cipso2 - write() for /smack/cipso2
1018 * @file: file pointer, not actually used
1019 * @buf: where to get the data from
1020 * @count: bytes sent
1021 * @ppos: where to start
1022 *
1023 * Accepts only one cipso rule per write call.
1024 * Returns number of bytes written or error code, as appropriate
1025 */
1026static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1027                              size_t count, loff_t *ppos)
1028{
1029        return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1030}
1031
1032static const struct file_operations smk_cipso2_ops = {
1033        .open           = smk_open_cipso2,
1034        .read           = seq_read,
1035        .llseek         = seq_lseek,
1036        .write          = smk_write_cipso2,
1037        .release        = seq_release,
1038};
1039
1040/*
1041 * Seq_file read operations for /smack/netlabel
1042 */
1043
1044static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1045{
1046        return smk_seq_start(s, pos, &smk_net4addr_list);
1047}
1048
1049static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1050{
1051        return smk_seq_next(s, v, pos, &smk_net4addr_list);
1052}
1053
1054/*
1055 * Print host/label pairs
1056 */
1057static int net4addr_seq_show(struct seq_file *s, void *v)
1058{
1059        struct list_head *list = v;
1060        struct smk_net4addr *skp =
1061                        list_entry_rcu(list, struct smk_net4addr, list);
1062        char *kp = SMACK_CIPSO_OPTION;
1063
1064        if (skp->smk_label != NULL)
1065                kp = skp->smk_label->smk_known;
1066        seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1067                        skp->smk_masks, kp);
1068
1069        return 0;
1070}
1071
1072static const struct seq_operations net4addr_seq_ops = {
1073        .start = net4addr_seq_start,
1074        .next  = net4addr_seq_next,
1075        .show  = net4addr_seq_show,
1076        .stop  = smk_seq_stop,
1077};
1078
1079/**
1080 * smk_open_net4addr - open() for /smack/netlabel
1081 * @inode: inode structure representing file
1082 * @file: "netlabel" file pointer
1083 *
1084 * Connect our net4addr_seq_* operations with /smack/netlabel
1085 * file_operations
1086 */
1087static int smk_open_net4addr(struct inode *inode, struct file *file)
1088{
1089        return seq_open(file, &net4addr_seq_ops);
1090}
1091
1092/**
1093 * smk_net4addr_insert
1094 * @new : netlabel to insert
1095 *
1096 * This helper insert netlabel in the smack_net4addrs list
1097 * sorted by netmask length (longest to smallest)
1098 * locked by &smk_net4addr_lock in smk_write_net4addr
1099 *
1100 */
1101static void smk_net4addr_insert(struct smk_net4addr *new)
1102{
1103        struct smk_net4addr *m;
1104        struct smk_net4addr *m_next;
1105
1106        if (list_empty(&smk_net4addr_list)) {
1107                list_add_rcu(&new->list, &smk_net4addr_list);
1108                return;
1109        }
1110
1111        m = list_entry_rcu(smk_net4addr_list.next,
1112                           struct smk_net4addr, list);
1113
1114        /* the comparison '>' is a bit hacky, but works */
1115        if (new->smk_masks > m->smk_masks) {
1116                list_add_rcu(&new->list, &smk_net4addr_list);
1117                return;
1118        }
1119
1120        list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1121                if (list_is_last(&m->list, &smk_net4addr_list)) {
1122                        list_add_rcu(&new->list, &m->list);
1123                        return;
1124                }
1125                m_next = list_entry_rcu(m->list.next,
1126                                        struct smk_net4addr, list);
1127                if (new->smk_masks > m_next->smk_masks) {
1128                        list_add_rcu(&new->list, &m->list);
1129                        return;
1130                }
1131        }
1132}
1133
1134
1135/**
1136 * smk_write_net4addr - write() for /smack/netlabel
1137 * @file: file pointer, not actually used
1138 * @buf: where to get the data from
1139 * @count: bytes sent
1140 * @ppos: where to start
1141 *
1142 * Accepts only one net4addr per write call.
1143 * Returns number of bytes written or error code, as appropriate
1144 */
1145static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1146                                size_t count, loff_t *ppos)
1147{
1148        struct smk_net4addr *snp;
1149        struct sockaddr_in newname;
1150        char *smack;
1151        struct smack_known *skp = NULL;
1152        char *data;
1153        char *host = (char *)&newname.sin_addr.s_addr;
1154        int rc;
1155        struct netlbl_audit audit_info;
1156        struct in_addr mask;
1157        unsigned int m;
1158        unsigned int masks;
1159        int found;
1160        u32 mask_bits = (1<<31);
1161        __be32 nsa;
1162        u32 temp_mask;
1163
1164        /*
1165         * Must have privilege.
1166         * No partial writes.
1167         * Enough data must be present.
1168         * "<addr/mask, as a.b.c.d/e><space><label>"
1169         * "<addr, as a.b.c.d><space><label>"
1170         */
1171        if (!smack_privileged(CAP_MAC_ADMIN))
1172                return -EPERM;
1173        if (*ppos != 0)
1174                return -EINVAL;
1175        if (count < SMK_NETLBLADDRMIN)
1176                return -EINVAL;
1177
1178        data = memdup_user_nul(buf, count);
1179        if (IS_ERR(data))
1180                return PTR_ERR(data);
1181
1182        smack = kzalloc(count + 1, GFP_KERNEL);
1183        if (smack == NULL) {
1184                rc = -ENOMEM;
1185                goto free_data_out;
1186        }
1187
1188        rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1189                &host[0], &host[1], &host[2], &host[3], &masks, smack);
1190        if (rc != 6) {
1191                rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1192                        &host[0], &host[1], &host[2], &host[3], smack);
1193                if (rc != 5) {
1194                        rc = -EINVAL;
1195                        goto free_out;
1196                }
1197                m = BEBITS;
1198                masks = 32;
1199        }
1200        if (masks > BEBITS) {
1201                rc = -EINVAL;
1202                goto free_out;
1203        }
1204
1205        /*
1206         * If smack begins with '-', it is an option, don't import it
1207         */
1208        if (smack[0] != '-') {
1209                skp = smk_import_entry(smack, 0);
1210                if (IS_ERR(skp)) {
1211                        rc = PTR_ERR(skp);
1212                        goto free_out;
1213                }
1214        } else {
1215                /*
1216                 * Only the -CIPSO option is supported for IPv4
1217                 */
1218                if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1219                        rc = -EINVAL;
1220                        goto free_out;
1221                }
1222        }
1223
1224        for (m = masks, temp_mask = 0; m > 0; m--) {
1225                temp_mask |= mask_bits;
1226                mask_bits >>= 1;
1227        }
1228        mask.s_addr = cpu_to_be32(temp_mask);
1229
1230        newname.sin_addr.s_addr &= mask.s_addr;
1231        /*
1232         * Only allow one writer at a time. Writes should be
1233         * quite rare and small in any case.
1234         */
1235        mutex_lock(&smk_net4addr_lock);
1236
1237        nsa = newname.sin_addr.s_addr;
1238        /* try to find if the prefix is already in the list */
1239        found = 0;
1240        list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1241                if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1242                        found = 1;
1243                        break;
1244                }
1245        }
1246        smk_netlabel_audit_set(&audit_info);
1247
1248        if (found == 0) {
1249                snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1250                if (snp == NULL)
1251                        rc = -ENOMEM;
1252                else {
1253                        rc = 0;
1254                        snp->smk_host.s_addr = newname.sin_addr.s_addr;
1255                        snp->smk_mask.s_addr = mask.s_addr;
1256                        snp->smk_label = skp;
1257                        snp->smk_masks = masks;
1258                        smk_net4addr_insert(snp);
1259                }
1260        } else {
1261                /*
1262                 * Delete the unlabeled entry, only if the previous label
1263                 * wasn't the special CIPSO option
1264                 */
1265                if (snp->smk_label != NULL)
1266                        rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1267                                        &snp->smk_host, &snp->smk_mask,
1268                                        PF_INET, &audit_info);
1269                else
1270                        rc = 0;
1271                snp->smk_label = skp;
1272        }
1273
1274        /*
1275         * Now tell netlabel about the single label nature of
1276         * this host so that incoming packets get labeled.
1277         * but only if we didn't get the special CIPSO option
1278         */
1279        if (rc == 0 && skp != NULL)
1280                rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1281                        &snp->smk_host, &snp->smk_mask, PF_INET,
1282                        snp->smk_label->smk_secid, &audit_info);
1283
1284        if (rc == 0)
1285                rc = count;
1286
1287        mutex_unlock(&smk_net4addr_lock);
1288
1289free_out:
1290        kfree(smack);
1291free_data_out:
1292        kfree(data);
1293
1294        return rc;
1295}
1296
1297static const struct file_operations smk_net4addr_ops = {
1298        .open           = smk_open_net4addr,
1299        .read           = seq_read,
1300        .llseek         = seq_lseek,
1301        .write          = smk_write_net4addr,
1302        .release        = seq_release,
1303};
1304
1305#if IS_ENABLED(CONFIG_IPV6)
1306/*
1307 * Seq_file read operations for /smack/netlabel6
1308 */
1309
1310static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1311{
1312        return smk_seq_start(s, pos, &smk_net6addr_list);
1313}
1314
1315static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1316{
1317        return smk_seq_next(s, v, pos, &smk_net6addr_list);
1318}
1319
1320/*
1321 * Print host/label pairs
1322 */
1323static int net6addr_seq_show(struct seq_file *s, void *v)
1324{
1325        struct list_head *list = v;
1326        struct smk_net6addr *skp =
1327                         list_entry(list, struct smk_net6addr, list);
1328
1329        if (skp->smk_label != NULL)
1330                seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1331                                skp->smk_label->smk_known);
1332
1333        return 0;
1334}
1335
1336static const struct seq_operations net6addr_seq_ops = {
1337        .start = net6addr_seq_start,
1338        .next  = net6addr_seq_next,
1339        .show  = net6addr_seq_show,
1340        .stop  = smk_seq_stop,
1341};
1342
1343/**
1344 * smk_open_net6addr - open() for /smack/netlabel
1345 * @inode: inode structure representing file
1346 * @file: "netlabel" file pointer
1347 *
1348 * Connect our net6addr_seq_* operations with /smack/netlabel
1349 * file_operations
1350 */
1351static int smk_open_net6addr(struct inode *inode, struct file *file)
1352{
1353        return seq_open(file, &net6addr_seq_ops);
1354}
1355
1356/**
1357 * smk_net6addr_insert
1358 * @new : entry to insert
1359 *
1360 * This inserts an entry in the smack_net6addrs list
1361 * sorted by netmask length (longest to smallest)
1362 * locked by &smk_net6addr_lock in smk_write_net6addr
1363 *
1364 */
1365static void smk_net6addr_insert(struct smk_net6addr *new)
1366{
1367        struct smk_net6addr *m_next;
1368        struct smk_net6addr *m;
1369
1370        if (list_empty(&smk_net6addr_list)) {
1371                list_add_rcu(&new->list, &smk_net6addr_list);
1372                return;
1373        }
1374
1375        m = list_entry_rcu(smk_net6addr_list.next,
1376                           struct smk_net6addr, list);
1377
1378        if (new->smk_masks > m->smk_masks) {
1379                list_add_rcu(&new->list, &smk_net6addr_list);
1380                return;
1381        }
1382
1383        list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1384                if (list_is_last(&m->list, &smk_net6addr_list)) {
1385                        list_add_rcu(&new->list, &m->list);
1386                        return;
1387                }
1388                m_next = list_entry_rcu(m->list.next,
1389                                        struct smk_net6addr, list);
1390                if (new->smk_masks > m_next->smk_masks) {
1391                        list_add_rcu(&new->list, &m->list);
1392                        return;
1393                }
1394        }
1395}
1396
1397
1398/**
1399 * smk_write_net6addr - write() for /smack/netlabel
1400 * @file: file pointer, not actually used
1401 * @buf: where to get the data from
1402 * @count: bytes sent
1403 * @ppos: where to start
1404 *
1405 * Accepts only one net6addr per write call.
1406 * Returns number of bytes written or error code, as appropriate
1407 */
1408static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1409                                size_t count, loff_t *ppos)
1410{
1411        struct smk_net6addr *snp;
1412        struct in6_addr newname;
1413        struct in6_addr fullmask;
1414        struct smack_known *skp = NULL;
1415        char *smack;
1416        char *data;
1417        int rc = 0;
1418        int found = 0;
1419        int i;
1420        unsigned int scanned[8];
1421        unsigned int m;
1422        unsigned int mask = 128;
1423
1424        /*
1425         * Must have privilege.
1426         * No partial writes.
1427         * Enough data must be present.
1428         * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1429         * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1430         */
1431        if (!smack_privileged(CAP_MAC_ADMIN))
1432                return -EPERM;
1433        if (*ppos != 0)
1434                return -EINVAL;
1435        if (count < SMK_NETLBLADDRMIN)
1436                return -EINVAL;
1437
1438        data = memdup_user_nul(buf, count);
1439        if (IS_ERR(data))
1440                return PTR_ERR(data);
1441
1442        smack = kzalloc(count + 1, GFP_KERNEL);
1443        if (smack == NULL) {
1444                rc = -ENOMEM;
1445                goto free_data_out;
1446        }
1447
1448        i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1449                        &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1450                        &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1451                        &mask, smack);
1452        if (i != 10) {
1453                i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1454                                &scanned[0], &scanned[1], &scanned[2],
1455                                &scanned[3], &scanned[4], &scanned[5],
1456                                &scanned[6], &scanned[7], smack);
1457                if (i != 9) {
1458                        rc = -EINVAL;
1459                        goto free_out;
1460                }
1461        }
1462        if (mask > 128) {
1463                rc = -EINVAL;
1464                goto free_out;
1465        }
1466        for (i = 0; i < 8; i++) {
1467                if (scanned[i] > 0xffff) {
1468                        rc = -EINVAL;
1469                        goto free_out;
1470                }
1471                newname.s6_addr16[i] = htons(scanned[i]);
1472        }
1473
1474        /*
1475         * If smack begins with '-', it is an option, don't import it
1476         */
1477        if (smack[0] != '-') {
1478                skp = smk_import_entry(smack, 0);
1479                if (IS_ERR(skp)) {
1480                        rc = PTR_ERR(skp);
1481                        goto free_out;
1482                }
1483        } else {
1484                /*
1485                 * Only -DELETE is supported for IPv6
1486                 */
1487                if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1488                        rc = -EINVAL;
1489                        goto free_out;
1490                }
1491        }
1492
1493        for (i = 0, m = mask; i < 8; i++) {
1494                if (m >= 16) {
1495                        fullmask.s6_addr16[i] = 0xffff;
1496                        m -= 16;
1497                } else if (m > 0) {
1498                        fullmask.s6_addr16[i] = (1 << m) - 1;
1499                        m = 0;
1500                } else
1501                        fullmask.s6_addr16[i] = 0;
1502                newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1503        }
1504
1505        /*
1506         * Only allow one writer at a time. Writes should be
1507         * quite rare and small in any case.
1508         */
1509        mutex_lock(&smk_net6addr_lock);
1510        /*
1511         * Try to find the prefix in the list
1512         */
1513        list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1514                if (mask != snp->smk_masks)
1515                        continue;
1516                for (found = 1, i = 0; i < 8; i++) {
1517                        if (newname.s6_addr16[i] !=
1518                            snp->smk_host.s6_addr16[i]) {
1519                                found = 0;
1520                                break;
1521                        }
1522                }
1523                if (found == 1)
1524                        break;
1525        }
1526        if (found == 0) {
1527                snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1528                if (snp == NULL)
1529                        rc = -ENOMEM;
1530                else {
1531                        snp->smk_host = newname;
1532                        snp->smk_mask = fullmask;
1533                        snp->smk_masks = mask;
1534                        snp->smk_label = skp;
1535                        smk_net6addr_insert(snp);
1536                }
1537        } else {
1538                snp->smk_label = skp;
1539        }
1540
1541        if (rc == 0)
1542                rc = count;
1543
1544        mutex_unlock(&smk_net6addr_lock);
1545
1546free_out:
1547        kfree(smack);
1548free_data_out:
1549        kfree(data);
1550
1551        return rc;
1552}
1553
1554static const struct file_operations smk_net6addr_ops = {
1555        .open           = smk_open_net6addr,
1556        .read           = seq_read,
1557        .llseek         = seq_lseek,
1558        .write          = smk_write_net6addr,
1559        .release        = seq_release,
1560};
1561#endif /* CONFIG_IPV6 */
1562
1563/**
1564 * smk_read_doi - read() for /smack/doi
1565 * @filp: file pointer, not actually used
1566 * @buf: where to put the result
1567 * @count: maximum to send along
1568 * @ppos: where to start
1569 *
1570 * Returns number of bytes read or error code, as appropriate
1571 */
1572static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1573                            size_t count, loff_t *ppos)
1574{
1575        char temp[80];
1576        ssize_t rc;
1577
1578        if (*ppos != 0)
1579                return 0;
1580
1581        sprintf(temp, "%d", smk_cipso_doi_value);
1582        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1583
1584        return rc;
1585}
1586
1587/**
1588 * smk_write_doi - write() for /smack/doi
1589 * @file: file pointer, not actually used
1590 * @buf: where to get the data from
1591 * @count: bytes sent
1592 * @ppos: where to start
1593 *
1594 * Returns number of bytes written or error code, as appropriate
1595 */
1596static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1597                             size_t count, loff_t *ppos)
1598{
1599        char temp[80];
1600        int i;
1601
1602        if (!smack_privileged(CAP_MAC_ADMIN))
1603                return -EPERM;
1604
1605        if (count >= sizeof(temp) || count == 0)
1606                return -EINVAL;
1607
1608        if (copy_from_user(temp, buf, count) != 0)
1609                return -EFAULT;
1610
1611        temp[count] = '\0';
1612
1613        if (sscanf(temp, "%d", &i) != 1)
1614                return -EINVAL;
1615
1616        smk_cipso_doi_value = i;
1617
1618        smk_cipso_doi();
1619
1620        return count;
1621}
1622
1623static const struct file_operations smk_doi_ops = {
1624        .read           = smk_read_doi,
1625        .write          = smk_write_doi,
1626        .llseek         = default_llseek,
1627};
1628
1629/**
1630 * smk_read_direct - read() for /smack/direct
1631 * @filp: file pointer, not actually used
1632 * @buf: where to put the result
1633 * @count: maximum to send along
1634 * @ppos: where to start
1635 *
1636 * Returns number of bytes read or error code, as appropriate
1637 */
1638static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1639                               size_t count, loff_t *ppos)
1640{
1641        char temp[80];
1642        ssize_t rc;
1643
1644        if (*ppos != 0)
1645                return 0;
1646
1647        sprintf(temp, "%d", smack_cipso_direct);
1648        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1649
1650        return rc;
1651}
1652
1653/**
1654 * smk_write_direct - write() for /smack/direct
1655 * @file: file pointer, not actually used
1656 * @buf: where to get the data from
1657 * @count: bytes sent
1658 * @ppos: where to start
1659 *
1660 * Returns number of bytes written or error code, as appropriate
1661 */
1662static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1663                                size_t count, loff_t *ppos)
1664{
1665        struct smack_known *skp;
1666        char temp[80];
1667        int i;
1668
1669        if (!smack_privileged(CAP_MAC_ADMIN))
1670                return -EPERM;
1671
1672        if (count >= sizeof(temp) || count == 0)
1673                return -EINVAL;
1674
1675        if (copy_from_user(temp, buf, count) != 0)
1676                return -EFAULT;
1677
1678        temp[count] = '\0';
1679
1680        if (sscanf(temp, "%d", &i) != 1)
1681                return -EINVAL;
1682
1683        /*
1684         * Don't do anything if the value hasn't actually changed.
1685         * If it is changing reset the level on entries that were
1686         * set up to be direct when they were created.
1687         */
1688        if (smack_cipso_direct != i) {
1689                mutex_lock(&smack_known_lock);
1690                list_for_each_entry_rcu(skp, &smack_known_list, list)
1691                        if (skp->smk_netlabel.attr.mls.lvl ==
1692                            smack_cipso_direct)
1693                                skp->smk_netlabel.attr.mls.lvl = i;
1694                smack_cipso_direct = i;
1695                mutex_unlock(&smack_known_lock);
1696        }
1697
1698        return count;
1699}
1700
1701static const struct file_operations smk_direct_ops = {
1702        .read           = smk_read_direct,
1703        .write          = smk_write_direct,
1704        .llseek         = default_llseek,
1705};
1706
1707/**
1708 * smk_read_mapped - read() for /smack/mapped
1709 * @filp: file pointer, not actually used
1710 * @buf: where to put the result
1711 * @count: maximum to send along
1712 * @ppos: where to start
1713 *
1714 * Returns number of bytes read or error code, as appropriate
1715 */
1716static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1717                               size_t count, loff_t *ppos)
1718{
1719        char temp[80];
1720        ssize_t rc;
1721
1722        if (*ppos != 0)
1723                return 0;
1724
1725        sprintf(temp, "%d", smack_cipso_mapped);
1726        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1727
1728        return rc;
1729}
1730
1731/**
1732 * smk_write_mapped - write() for /smack/mapped
1733 * @file: file pointer, not actually used
1734 * @buf: where to get the data from
1735 * @count: bytes sent
1736 * @ppos: where to start
1737 *
1738 * Returns number of bytes written or error code, as appropriate
1739 */
1740static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1741                                size_t count, loff_t *ppos)
1742{
1743        struct smack_known *skp;
1744        char temp[80];
1745        int i;
1746
1747        if (!smack_privileged(CAP_MAC_ADMIN))
1748                return -EPERM;
1749
1750        if (count >= sizeof(temp) || count == 0)
1751                return -EINVAL;
1752
1753        if (copy_from_user(temp, buf, count) != 0)
1754                return -EFAULT;
1755
1756        temp[count] = '\0';
1757
1758        if (sscanf(temp, "%d", &i) != 1)
1759                return -EINVAL;
1760
1761        /*
1762         * Don't do anything if the value hasn't actually changed.
1763         * If it is changing reset the level on entries that were
1764         * set up to be mapped when they were created.
1765         */
1766        if (smack_cipso_mapped != i) {
1767                mutex_lock(&smack_known_lock);
1768                list_for_each_entry_rcu(skp, &smack_known_list, list)
1769                        if (skp->smk_netlabel.attr.mls.lvl ==
1770                            smack_cipso_mapped)
1771                                skp->smk_netlabel.attr.mls.lvl = i;
1772                smack_cipso_mapped = i;
1773                mutex_unlock(&smack_known_lock);
1774        }
1775
1776        return count;
1777}
1778
1779static const struct file_operations smk_mapped_ops = {
1780        .read           = smk_read_mapped,
1781        .write          = smk_write_mapped,
1782        .llseek         = default_llseek,
1783};
1784
1785/**
1786 * smk_read_ambient - read() for /smack/ambient
1787 * @filp: file pointer, not actually used
1788 * @buf: where to put the result
1789 * @cn: maximum to send along
1790 * @ppos: where to start
1791 *
1792 * Returns number of bytes read or error code, as appropriate
1793 */
1794static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1795                                size_t cn, loff_t *ppos)
1796{
1797        ssize_t rc;
1798        int asize;
1799
1800        if (*ppos != 0)
1801                return 0;
1802        /*
1803         * Being careful to avoid a problem in the case where
1804         * smack_net_ambient gets changed in midstream.
1805         */
1806        mutex_lock(&smack_ambient_lock);
1807
1808        asize = strlen(smack_net_ambient->smk_known) + 1;
1809
1810        if (cn >= asize)
1811                rc = simple_read_from_buffer(buf, cn, ppos,
1812                                             smack_net_ambient->smk_known,
1813                                             asize);
1814        else
1815                rc = -EINVAL;
1816
1817        mutex_unlock(&smack_ambient_lock);
1818
1819        return rc;
1820}
1821
1822/**
1823 * smk_write_ambient - write() for /smack/ambient
1824 * @file: file pointer, not actually used
1825 * @buf: where to get the data from
1826 * @count: bytes sent
1827 * @ppos: where to start
1828 *
1829 * Returns number of bytes written or error code, as appropriate
1830 */
1831static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1832                                 size_t count, loff_t *ppos)
1833{
1834        struct smack_known *skp;
1835        char *oldambient;
1836        char *data;
1837        int rc = count;
1838
1839        if (!smack_privileged(CAP_MAC_ADMIN))
1840                return -EPERM;
1841
1842        data = memdup_user_nul(buf, count);
1843        if (IS_ERR(data))
1844                return PTR_ERR(data);
1845
1846        skp = smk_import_entry(data, count);
1847        if (IS_ERR(skp)) {
1848                rc = PTR_ERR(skp);
1849                goto out;
1850        }
1851
1852        mutex_lock(&smack_ambient_lock);
1853
1854        oldambient = smack_net_ambient->smk_known;
1855        smack_net_ambient = skp;
1856        smk_unlbl_ambient(oldambient);
1857
1858        mutex_unlock(&smack_ambient_lock);
1859
1860out:
1861        kfree(data);
1862        return rc;
1863}
1864
1865static const struct file_operations smk_ambient_ops = {
1866        .read           = smk_read_ambient,
1867        .write          = smk_write_ambient,
1868        .llseek         = default_llseek,
1869};
1870
1871/*
1872 * Seq_file operations for /smack/onlycap
1873 */
1874static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1875{
1876        return smk_seq_start(s, pos, &smack_onlycap_list);
1877}
1878
1879static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1880{
1881        return smk_seq_next(s, v, pos, &smack_onlycap_list);
1882}
1883
1884static int onlycap_seq_show(struct seq_file *s, void *v)
1885{
1886        struct list_head *list = v;
1887        struct smack_known_list_elem *sklep =
1888                list_entry_rcu(list, struct smack_known_list_elem, list);
1889
1890        seq_puts(s, sklep->smk_label->smk_known);
1891        seq_putc(s, ' ');
1892
1893        return 0;
1894}
1895
1896static const struct seq_operations onlycap_seq_ops = {
1897        .start = onlycap_seq_start,
1898        .next  = onlycap_seq_next,
1899        .show  = onlycap_seq_show,
1900        .stop  = smk_seq_stop,
1901};
1902
1903static int smk_open_onlycap(struct inode *inode, struct file *file)
1904{
1905        return seq_open(file, &onlycap_seq_ops);
1906}
1907
1908/**
1909 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1910 * The caller must hold appropriate mutex to prevent concurrent modifications
1911 * to the public list.
1912 * Private list is assumed to be not accessible to other threads yet.
1913 *
1914 * @public: public list
1915 * @private: private list
1916 */
1917static void smk_list_swap_rcu(struct list_head *public,
1918                              struct list_head *private)
1919{
1920        struct list_head *first, *last;
1921
1922        if (list_empty(public)) {
1923                list_splice_init_rcu(private, public, synchronize_rcu);
1924        } else {
1925                /* Remember public list before replacing it */
1926                first = public->next;
1927                last = public->prev;
1928
1929                /* Publish private list in place of public in RCU-safe way */
1930                private->prev->next = public;
1931                private->next->prev = public;
1932                rcu_assign_pointer(public->next, private->next);
1933                public->prev = private->prev;
1934
1935                synchronize_rcu();
1936
1937                /* When all readers are done with the old public list,
1938                 * attach it in place of private */
1939                private->next = first;
1940                private->prev = last;
1941                first->prev = private;
1942                last->next = private;
1943        }
1944}
1945
1946/**
1947 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1948 *
1949 * @data: the string to parse
1950 * @private: destination list
1951 *
1952 * Returns zero on success or error code, as appropriate
1953 */
1954static int smk_parse_label_list(char *data, struct list_head *list)
1955{
1956        char *tok;
1957        struct smack_known *skp;
1958        struct smack_known_list_elem *sklep;
1959
1960        while ((tok = strsep(&data, " ")) != NULL) {
1961                if (!*tok)
1962                        continue;
1963
1964                skp = smk_import_entry(tok, 0);
1965                if (IS_ERR(skp))
1966                        return PTR_ERR(skp);
1967
1968                sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1969                if (sklep == NULL)
1970                        return -ENOMEM;
1971
1972                sklep->smk_label = skp;
1973                list_add(&sklep->list, list);
1974        }
1975
1976        return 0;
1977}
1978
1979/**
1980 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1981 * @head: header pointer of the list to destroy
1982 */
1983void smk_destroy_label_list(struct list_head *list)
1984{
1985        struct smack_known_list_elem *sklep;
1986        struct smack_known_list_elem *sklep2;
1987
1988        list_for_each_entry_safe(sklep, sklep2, list, list)
1989                kfree(sklep);
1990
1991        INIT_LIST_HEAD(list);
1992}
1993
1994/**
1995 * smk_write_onlycap - write() for smackfs/onlycap
1996 * @file: file pointer, not actually used
1997 * @buf: where to get the data from
1998 * @count: bytes sent
1999 * @ppos: where to start
2000 *
2001 * Returns number of bytes written or error code, as appropriate
2002 */
2003static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2004                                 size_t count, loff_t *ppos)
2005{
2006        char *data;
2007        LIST_HEAD(list_tmp);
2008        int rc;
2009
2010        if (!smack_privileged(CAP_MAC_ADMIN))
2011                return -EPERM;
2012
2013        data = memdup_user_nul(buf, count);
2014        if (IS_ERR(data))
2015                return PTR_ERR(data);
2016
2017        rc = smk_parse_label_list(data, &list_tmp);
2018        kfree(data);
2019
2020        /*
2021         * Clear the smack_onlycap on invalid label errors. This means
2022         * that we can pass a null string to unset the onlycap value.
2023         *
2024         * Importing will also reject a label beginning with '-',
2025         * so "-usecapabilities" will also work.
2026         *
2027         * But do so only on invalid label, not on system errors.
2028         * The invalid label must be first to count as clearing attempt.
2029         */
2030        if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2031                mutex_lock(&smack_onlycap_lock);
2032                smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2033                mutex_unlock(&smack_onlycap_lock);
2034                rc = count;
2035        }
2036
2037        smk_destroy_label_list(&list_tmp);
2038
2039        return rc;
2040}
2041
2042static const struct file_operations smk_onlycap_ops = {
2043        .open           = smk_open_onlycap,
2044        .read           = seq_read,
2045        .write          = smk_write_onlycap,
2046        .llseek         = seq_lseek,
2047        .release        = seq_release,
2048};
2049
2050#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2051/**
2052 * smk_read_unconfined - read() for smackfs/unconfined
2053 * @filp: file pointer, not actually used
2054 * @buf: where to put the result
2055 * @cn: maximum to send along
2056 * @ppos: where to start
2057 *
2058 * Returns number of bytes read or error code, as appropriate
2059 */
2060static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2061                                        size_t cn, loff_t *ppos)
2062{
2063        char *smack = "";
2064        ssize_t rc = -EINVAL;
2065        int asize;
2066
2067        if (*ppos != 0)
2068                return 0;
2069
2070        if (smack_unconfined != NULL)
2071                smack = smack_unconfined->smk_known;
2072
2073        asize = strlen(smack) + 1;
2074
2075        if (cn >= asize)
2076                rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2077
2078        return rc;
2079}
2080
2081/**
2082 * smk_write_unconfined - write() for smackfs/unconfined
2083 * @file: file pointer, not actually used
2084 * @buf: where to get the data from
2085 * @count: bytes sent
2086 * @ppos: where to start
2087 *
2088 * Returns number of bytes written or error code, as appropriate
2089 */
2090static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2091                                        size_t count, loff_t *ppos)
2092{
2093        char *data;
2094        struct smack_known *skp;
2095        int rc = count;
2096
2097        if (!smack_privileged(CAP_MAC_ADMIN))
2098                return -EPERM;
2099
2100        data = memdup_user_nul(buf, count);
2101        if (IS_ERR(data))
2102                return PTR_ERR(data);
2103
2104        /*
2105         * Clear the smack_unconfined on invalid label errors. This means
2106         * that we can pass a null string to unset the unconfined value.
2107         *
2108         * Importing will also reject a label beginning with '-',
2109         * so "-confine" will also work.
2110         *
2111         * But do so only on invalid label, not on system errors.
2112         */
2113        skp = smk_import_entry(data, count);
2114        if (PTR_ERR(skp) == -EINVAL)
2115                skp = NULL;
2116        else if (IS_ERR(skp)) {
2117                rc = PTR_ERR(skp);
2118                goto freeout;
2119        }
2120
2121        smack_unconfined = skp;
2122
2123freeout:
2124        kfree(data);
2125        return rc;
2126}
2127
2128static const struct file_operations smk_unconfined_ops = {
2129        .read           = smk_read_unconfined,
2130        .write          = smk_write_unconfined,
2131        .llseek         = default_llseek,
2132};
2133#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2134
2135/**
2136 * smk_read_logging - read() for /smack/logging
2137 * @filp: file pointer, not actually used
2138 * @buf: where to put the result
2139 * @cn: maximum to send along
2140 * @ppos: where to start
2141 *
2142 * Returns number of bytes read or error code, as appropriate
2143 */
2144static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2145                                size_t count, loff_t *ppos)
2146{
2147        char temp[32];
2148        ssize_t rc;
2149
2150        if (*ppos != 0)
2151                return 0;
2152
2153        sprintf(temp, "%d\n", log_policy);
2154        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2155        return rc;
2156}
2157
2158/**
2159 * smk_write_logging - write() for /smack/logging
2160 * @file: file pointer, not actually used
2161 * @buf: where to get the data from
2162 * @count: bytes sent
2163 * @ppos: where to start
2164 *
2165 * Returns number of bytes written or error code, as appropriate
2166 */
2167static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2168                                size_t count, loff_t *ppos)
2169{
2170        char temp[32];
2171        int i;
2172
2173        if (!smack_privileged(CAP_MAC_ADMIN))
2174                return -EPERM;
2175
2176        if (count >= sizeof(temp) || count == 0)
2177                return -EINVAL;
2178
2179        if (copy_from_user(temp, buf, count) != 0)
2180                return -EFAULT;
2181
2182        temp[count] = '\0';
2183
2184        if (sscanf(temp, "%d", &i) != 1)
2185                return -EINVAL;
2186        if (i < 0 || i > 3)
2187                return -EINVAL;
2188        log_policy = i;
2189        return count;
2190}
2191
2192
2193
2194static const struct file_operations smk_logging_ops = {
2195        .read           = smk_read_logging,
2196        .write          = smk_write_logging,
2197        .llseek         = default_llseek,
2198};
2199
2200/*
2201 * Seq_file read operations for /smack/load-self
2202 */
2203
2204static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2205{
2206        struct task_smack *tsp = current_security();
2207
2208        return smk_seq_start(s, pos, &tsp->smk_rules);
2209}
2210
2211static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2212{
2213        struct task_smack *tsp = current_security();
2214
2215        return smk_seq_next(s, v, pos, &tsp->smk_rules);
2216}
2217
2218static int load_self_seq_show(struct seq_file *s, void *v)
2219{
2220        struct list_head *list = v;
2221        struct smack_rule *srp =
2222                list_entry_rcu(list, struct smack_rule, list);
2223
2224        smk_rule_show(s, srp, SMK_LABELLEN);
2225
2226        return 0;
2227}
2228
2229static const struct seq_operations load_self_seq_ops = {
2230        .start = load_self_seq_start,
2231        .next  = load_self_seq_next,
2232        .show  = load_self_seq_show,
2233        .stop  = smk_seq_stop,
2234};
2235
2236
2237/**
2238 * smk_open_load_self - open() for /smack/load-self2
2239 * @inode: inode structure representing file
2240 * @file: "load" file pointer
2241 *
2242 * For reading, use load_seq_* seq_file reading operations.
2243 */
2244static int smk_open_load_self(struct inode *inode, struct file *file)
2245{
2246        return seq_open(file, &load_self_seq_ops);
2247}
2248
2249/**
2250 * smk_write_load_self - write() for /smack/load-self
2251 * @file: file pointer, not actually used
2252 * @buf: where to get the data from
2253 * @count: bytes sent
2254 * @ppos: where to start - must be 0
2255 *
2256 */
2257static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2258                              size_t count, loff_t *ppos)
2259{
2260        struct task_smack *tsp = current_security();
2261
2262        return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2263                                    &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2264}
2265
2266static const struct file_operations smk_load_self_ops = {
2267        .open           = smk_open_load_self,
2268        .read           = seq_read,
2269        .llseek         = seq_lseek,
2270        .write          = smk_write_load_self,
2271        .release        = seq_release,
2272};
2273
2274/**
2275 * smk_user_access - handle access check transaction
2276 * @file: file pointer
2277 * @buf: data from user space
2278 * @count: bytes sent
2279 * @ppos: where to start - must be 0
2280 */
2281static ssize_t smk_user_access(struct file *file, const char __user *buf,
2282                                size_t count, loff_t *ppos, int format)
2283{
2284        struct smack_parsed_rule rule;
2285        char *data;
2286        int res;
2287
2288        data = simple_transaction_get(file, buf, count);
2289        if (IS_ERR(data))
2290                return PTR_ERR(data);
2291
2292        if (format == SMK_FIXED24_FMT) {
2293                if (count < SMK_LOADLEN)
2294                        return -EINVAL;
2295                res = smk_parse_rule(data, &rule, 0);
2296        } else {
2297                /*
2298                 * simple_transaction_get() returns null-terminated data
2299                 */
2300                res = smk_parse_long_rule(data, &rule, 0, 3);
2301        }
2302
2303        if (res >= 0)
2304                res = smk_access(rule.smk_subject, rule.smk_object,
2305                                 rule.smk_access1, NULL);
2306        else if (res != -ENOENT)
2307                return res;
2308
2309        /*
2310         * smk_access() can return a value > 0 in the "bringup" case.
2311         */
2312        data[0] = res >= 0 ? '1' : '0';
2313        data[1] = '\0';
2314
2315        simple_transaction_set(file, 2);
2316
2317        if (format == SMK_FIXED24_FMT)
2318                return SMK_LOADLEN;
2319        return count;
2320}
2321
2322/**
2323 * smk_write_access - handle access check transaction
2324 * @file: file pointer
2325 * @buf: data from user space
2326 * @count: bytes sent
2327 * @ppos: where to start - must be 0
2328 */
2329static ssize_t smk_write_access(struct file *file, const char __user *buf,
2330                                size_t count, loff_t *ppos)
2331{
2332        return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2333}
2334
2335static const struct file_operations smk_access_ops = {
2336        .write          = smk_write_access,
2337        .read           = simple_transaction_read,
2338        .release        = simple_transaction_release,
2339        .llseek         = generic_file_llseek,
2340};
2341
2342
2343/*
2344 * Seq_file read operations for /smack/load2
2345 */
2346
2347static int load2_seq_show(struct seq_file *s, void *v)
2348{
2349        struct list_head *list = v;
2350        struct smack_master_list *smlp =
2351                list_entry_rcu(list, struct smack_master_list, list);
2352
2353        smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
2354
2355        return 0;
2356}
2357
2358static const struct seq_operations load2_seq_ops = {
2359        .start = load2_seq_start,
2360        .next  = load2_seq_next,
2361        .show  = load2_seq_show,
2362        .stop  = smk_seq_stop,
2363};
2364
2365/**
2366 * smk_open_load2 - open() for /smack/load2
2367 * @inode: inode structure representing file
2368 * @file: "load2" file pointer
2369 *
2370 * For reading, use load2_seq_* seq_file reading operations.
2371 */
2372static int smk_open_load2(struct inode *inode, struct file *file)
2373{
2374        return seq_open(file, &load2_seq_ops);
2375}
2376
2377/**
2378 * smk_write_load2 - write() for /smack/load2
2379 * @file: file pointer, not actually used
2380 * @buf: where to get the data from
2381 * @count: bytes sent
2382 * @ppos: where to start - must be 0
2383 *
2384 */
2385static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2386                                size_t count, loff_t *ppos)
2387{
2388        /*
2389         * Must have privilege.
2390         */
2391        if (!smack_privileged(CAP_MAC_ADMIN))
2392                return -EPERM;
2393
2394        return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2395                                    SMK_LONG_FMT);
2396}
2397
2398static const struct file_operations smk_load2_ops = {
2399        .open           = smk_open_load2,
2400        .read           = seq_read,
2401        .llseek         = seq_lseek,
2402        .write          = smk_write_load2,
2403        .release        = seq_release,
2404};
2405
2406/*
2407 * Seq_file read operations for /smack/load-self2
2408 */
2409
2410static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2411{
2412        struct task_smack *tsp = current_security();
2413
2414        return smk_seq_start(s, pos, &tsp->smk_rules);
2415}
2416
2417static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2418{
2419        struct task_smack *tsp = current_security();
2420
2421        return smk_seq_next(s, v, pos, &tsp->smk_rules);
2422}
2423
2424static int load_self2_seq_show(struct seq_file *s, void *v)
2425{
2426        struct list_head *list = v;
2427        struct smack_rule *srp =
2428                list_entry_rcu(list, struct smack_rule, list);
2429
2430        smk_rule_show(s, srp, SMK_LONGLABEL);
2431
2432        return 0;
2433}
2434
2435static const struct seq_operations load_self2_seq_ops = {
2436        .start = load_self2_seq_start,
2437        .next  = load_self2_seq_next,
2438        .show  = load_self2_seq_show,
2439        .stop  = smk_seq_stop,
2440};
2441
2442/**
2443 * smk_open_load_self2 - open() for /smack/load-self2
2444 * @inode: inode structure representing file
2445 * @file: "load" file pointer
2446 *
2447 * For reading, use load_seq_* seq_file reading operations.
2448 */
2449static int smk_open_load_self2(struct inode *inode, struct file *file)
2450{
2451        return seq_open(file, &load_self2_seq_ops);
2452}
2453
2454/**
2455 * smk_write_load_self2 - write() for /smack/load-self2
2456 * @file: file pointer, not actually used
2457 * @buf: where to get the data from
2458 * @count: bytes sent
2459 * @ppos: where to start - must be 0
2460 *
2461 */
2462static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2463                              size_t count, loff_t *ppos)
2464{
2465        struct task_smack *tsp = current_security();
2466
2467        return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2468                                    &tsp->smk_rules_lock, SMK_LONG_FMT);
2469}
2470
2471static const struct file_operations smk_load_self2_ops = {
2472        .open           = smk_open_load_self2,
2473        .read           = seq_read,
2474        .llseek         = seq_lseek,
2475        .write          = smk_write_load_self2,
2476        .release        = seq_release,
2477};
2478
2479/**
2480 * smk_write_access2 - handle access check transaction
2481 * @file: file pointer
2482 * @buf: data from user space
2483 * @count: bytes sent
2484 * @ppos: where to start - must be 0
2485 */
2486static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2487                                        size_t count, loff_t *ppos)
2488{
2489        return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2490}
2491
2492static const struct file_operations smk_access2_ops = {
2493        .write          = smk_write_access2,
2494        .read           = simple_transaction_read,
2495        .release        = simple_transaction_release,
2496        .llseek         = generic_file_llseek,
2497};
2498
2499/**
2500 * smk_write_revoke_subj - write() for /smack/revoke-subject
2501 * @file: file pointer
2502 * @buf: data from user space
2503 * @count: bytes sent
2504 * @ppos: where to start - must be 0
2505 */
2506static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2507                                size_t count, loff_t *ppos)
2508{
2509        char *data;
2510        const char *cp;
2511        struct smack_known *skp;
2512        struct smack_rule *sp;
2513        struct list_head *rule_list;
2514        struct mutex *rule_lock;
2515        int rc = count;
2516
2517        if (*ppos != 0)
2518                return -EINVAL;
2519
2520        if (!smack_privileged(CAP_MAC_ADMIN))
2521                return -EPERM;
2522
2523        if (count == 0 || count > SMK_LONGLABEL)
2524                return -EINVAL;
2525
2526        data = kzalloc(count, GFP_KERNEL);
2527        if (data == NULL)
2528                return -ENOMEM;
2529
2530        if (copy_from_user(data, buf, count) != 0) {
2531                rc = -EFAULT;
2532                goto out_data;
2533        }
2534
2535        cp = smk_parse_smack(data, count);
2536        if (IS_ERR(cp)) {
2537                rc = PTR_ERR(cp);
2538                goto out_data;
2539        }
2540
2541        skp = smk_find_entry(cp);
2542        if (skp == NULL)
2543                goto out_cp;
2544
2545        rule_list = &skp->smk_rules;
2546        rule_lock = &skp->smk_rules_lock;
2547
2548        mutex_lock(rule_lock);
2549
2550        list_for_each_entry_rcu(sp, rule_list, list)
2551                sp->smk_access = 0;
2552
2553        mutex_unlock(rule_lock);
2554
2555out_cp:
2556        kfree(cp);
2557out_data:
2558        kfree(data);
2559
2560        return rc;
2561}
2562
2563static const struct file_operations smk_revoke_subj_ops = {
2564        .write          = smk_write_revoke_subj,
2565        .read           = simple_transaction_read,
2566        .release        = simple_transaction_release,
2567        .llseek         = generic_file_llseek,
2568};
2569
2570/**
2571 * smk_init_sysfs - initialize /sys/fs/smackfs
2572 *
2573 */
2574static int smk_init_sysfs(void)
2575{
2576        return sysfs_create_mount_point(fs_kobj, "smackfs");
2577}
2578
2579/**
2580 * smk_write_change_rule - write() for /smack/change-rule
2581 * @file: file pointer
2582 * @buf: data from user space
2583 * @count: bytes sent
2584 * @ppos: where to start - must be 0
2585 */
2586static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2587                                size_t count, loff_t *ppos)
2588{
2589        /*
2590         * Must have privilege.
2591         */
2592        if (!smack_privileged(CAP_MAC_ADMIN))
2593                return -EPERM;
2594
2595        return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2596                                    SMK_CHANGE_FMT);
2597}
2598
2599static const struct file_operations smk_change_rule_ops = {
2600        .write          = smk_write_change_rule,
2601        .read           = simple_transaction_read,
2602        .release        = simple_transaction_release,
2603        .llseek         = generic_file_llseek,
2604};
2605
2606/**
2607 * smk_read_syslog - read() for smackfs/syslog
2608 * @filp: file pointer, not actually used
2609 * @buf: where to put the result
2610 * @cn: maximum to send along
2611 * @ppos: where to start
2612 *
2613 * Returns number of bytes read or error code, as appropriate
2614 */
2615static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2616                                size_t cn, loff_t *ppos)
2617{
2618        struct smack_known *skp;
2619        ssize_t rc = -EINVAL;
2620        int asize;
2621
2622        if (*ppos != 0)
2623                return 0;
2624
2625        if (smack_syslog_label == NULL)
2626                skp = &smack_known_star;
2627        else
2628                skp = smack_syslog_label;
2629
2630        asize = strlen(skp->smk_known) + 1;
2631
2632        if (cn >= asize)
2633                rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2634                                                asize);
2635
2636        return rc;
2637}
2638
2639/**
2640 * smk_write_syslog - write() for smackfs/syslog
2641 * @file: file pointer, not actually used
2642 * @buf: where to get the data from
2643 * @count: bytes sent
2644 * @ppos: where to start
2645 *
2646 * Returns number of bytes written or error code, as appropriate
2647 */
2648static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2649                                size_t count, loff_t *ppos)
2650{
2651        char *data;
2652        struct smack_known *skp;
2653        int rc = count;
2654
2655        if (!smack_privileged(CAP_MAC_ADMIN))
2656                return -EPERM;
2657
2658        data = memdup_user_nul(buf, count);
2659        if (IS_ERR(data))
2660                return PTR_ERR(data);
2661
2662        skp = smk_import_entry(data, count);
2663        if (IS_ERR(skp))
2664                rc = PTR_ERR(skp);
2665        else
2666                smack_syslog_label = skp;
2667
2668        kfree(data);
2669        return rc;
2670}
2671
2672static const struct file_operations smk_syslog_ops = {
2673        .read           = smk_read_syslog,
2674        .write          = smk_write_syslog,
2675        .llseek         = default_llseek,
2676};
2677
2678/*
2679 * Seq_file read operations for /smack/relabel-self
2680 */
2681
2682static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2683{
2684        struct task_smack *tsp = current_security();
2685
2686        return smk_seq_start(s, pos, &tsp->smk_relabel);
2687}
2688
2689static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2690{
2691        struct task_smack *tsp = current_security();
2692
2693        return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2694}
2695
2696static int relabel_self_seq_show(struct seq_file *s, void *v)
2697{
2698        struct list_head *list = v;
2699        struct smack_known_list_elem *sklep =
2700                list_entry(list, struct smack_known_list_elem, list);
2701
2702        seq_puts(s, sklep->smk_label->smk_known);
2703        seq_putc(s, ' ');
2704
2705        return 0;
2706}
2707
2708static const struct seq_operations relabel_self_seq_ops = {
2709        .start = relabel_self_seq_start,
2710        .next  = relabel_self_seq_next,
2711        .show  = relabel_self_seq_show,
2712        .stop  = smk_seq_stop,
2713};
2714
2715/**
2716 * smk_open_relabel_self - open() for /smack/relabel-self
2717 * @inode: inode structure representing file
2718 * @file: "relabel-self" file pointer
2719 *
2720 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2721 * file_operations
2722 */
2723static int smk_open_relabel_self(struct inode *inode, struct file *file)
2724{
2725        return seq_open(file, &relabel_self_seq_ops);
2726}
2727
2728/**
2729 * smk_write_relabel_self - write() for /smack/relabel-self
2730 * @file: file pointer, not actually used
2731 * @buf: where to get the data from
2732 * @count: bytes sent
2733 * @ppos: where to start - must be 0
2734 *
2735 */
2736static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2737                                size_t count, loff_t *ppos)
2738{
2739        struct task_smack *tsp = current_security();
2740        char *data;
2741        int rc;
2742        LIST_HEAD(list_tmp);
2743
2744        /*
2745         * Must have privilege.
2746         */
2747        if (!smack_privileged(CAP_MAC_ADMIN))
2748                return -EPERM;
2749
2750        /*
2751         * Enough data must be present.
2752         */
2753        if (*ppos != 0)
2754                return -EINVAL;
2755
2756        data = memdup_user_nul(buf, count);
2757        if (IS_ERR(data))
2758                return PTR_ERR(data);
2759
2760        rc = smk_parse_label_list(data, &list_tmp);
2761        kfree(data);
2762
2763        if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2764                smk_destroy_label_list(&tsp->smk_relabel);
2765                list_splice(&list_tmp, &tsp->smk_relabel);
2766                return count;
2767        }
2768
2769        smk_destroy_label_list(&list_tmp);
2770        return rc;
2771}
2772
2773static const struct file_operations smk_relabel_self_ops = {
2774        .open           = smk_open_relabel_self,
2775        .read           = seq_read,
2776        .llseek         = seq_lseek,
2777        .write          = smk_write_relabel_self,
2778        .release        = seq_release,
2779};
2780
2781/**
2782 * smk_read_ptrace - read() for /smack/ptrace
2783 * @filp: file pointer, not actually used
2784 * @buf: where to put the result
2785 * @count: maximum to send along
2786 * @ppos: where to start
2787 *
2788 * Returns number of bytes read or error code, as appropriate
2789 */
2790static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2791                               size_t count, loff_t *ppos)
2792{
2793        char temp[32];
2794        ssize_t rc;
2795
2796        if (*ppos != 0)
2797                return 0;
2798
2799        sprintf(temp, "%d\n", smack_ptrace_rule);
2800        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2801        return rc;
2802}
2803
2804/**
2805 * smk_write_ptrace - write() for /smack/ptrace
2806 * @file: file pointer
2807 * @buf: data from user space
2808 * @count: bytes sent
2809 * @ppos: where to start - must be 0
2810 */
2811static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2812                                size_t count, loff_t *ppos)
2813{
2814        char temp[32];
2815        int i;
2816
2817        if (!smack_privileged(CAP_MAC_ADMIN))
2818                return -EPERM;
2819
2820        if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2821                return -EINVAL;
2822
2823        if (copy_from_user(temp, buf, count) != 0)
2824                return -EFAULT;
2825
2826        temp[count] = '\0';
2827
2828        if (sscanf(temp, "%d", &i) != 1)
2829                return -EINVAL;
2830        if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2831                return -EINVAL;
2832        smack_ptrace_rule = i;
2833
2834        return count;
2835}
2836
2837static const struct file_operations smk_ptrace_ops = {
2838        .write          = smk_write_ptrace,
2839        .read           = smk_read_ptrace,
2840        .llseek         = default_llseek,
2841};
2842
2843/**
2844 * smk_fill_super - fill the smackfs superblock
2845 * @sb: the empty superblock
2846 * @data: unused
2847 * @silent: unused
2848 *
2849 * Fill in the well known entries for the smack filesystem
2850 *
2851 * Returns 0 on success, an error code on failure
2852 */
2853static int smk_fill_super(struct super_block *sb, void *data, int silent)
2854{
2855        int rc;
2856        struct inode *root_inode;
2857
2858        static struct tree_descr smack_files[] = {
2859                [SMK_LOAD] = {
2860                        "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2861                [SMK_CIPSO] = {
2862                        "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2863                [SMK_DOI] = {
2864                        "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2865                [SMK_DIRECT] = {
2866                        "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2867                [SMK_AMBIENT] = {
2868                        "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2869                [SMK_NET4ADDR] = {
2870                        "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2871                [SMK_ONLYCAP] = {
2872                        "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2873                [SMK_LOGGING] = {
2874                        "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2875                [SMK_LOAD_SELF] = {
2876                        "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2877                [SMK_ACCESSES] = {
2878                        "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2879                [SMK_MAPPED] = {
2880                        "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2881                [SMK_LOAD2] = {
2882                        "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2883                [SMK_LOAD_SELF2] = {
2884                        "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2885                [SMK_ACCESS2] = {
2886                        "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2887                [SMK_CIPSO2] = {
2888                        "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2889                [SMK_REVOKE_SUBJ] = {
2890                        "revoke-subject", &smk_revoke_subj_ops,
2891                        S_IRUGO|S_IWUSR},
2892                [SMK_CHANGE_RULE] = {
2893                        "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2894                [SMK_SYSLOG] = {
2895                        "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2896                [SMK_PTRACE] = {
2897                        "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2898#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2899                [SMK_UNCONFINED] = {
2900                        "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2901#endif
2902#if IS_ENABLED(CONFIG_IPV6)
2903                [SMK_NET6ADDR] = {
2904                        "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2905#endif /* CONFIG_IPV6 */
2906                [SMK_RELABEL_SELF] = {
2907                        "relabel-self", &smk_relabel_self_ops,
2908                                S_IRUGO|S_IWUGO},
2909                /* last one */
2910                        {""}
2911        };
2912
2913        rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2914        if (rc != 0) {
2915                printk(KERN_ERR "%s failed %d while creating inodes\n",
2916                        __func__, rc);
2917                return rc;
2918        }
2919
2920        root_inode = d_inode(sb->s_root);
2921
2922        return 0;
2923}
2924
2925/**
2926 * smk_mount - get the smackfs superblock
2927 * @fs_type: passed along without comment
2928 * @flags: passed along without comment
2929 * @dev_name: passed along without comment
2930 * @data: passed along without comment
2931 *
2932 * Just passes everything along.
2933 *
2934 * Returns what the lower level code does.
2935 */
2936static struct dentry *smk_mount(struct file_system_type *fs_type,
2937                      int flags, const char *dev_name, void *data)
2938{
2939        return mount_single(fs_type, flags, data, smk_fill_super);
2940}
2941
2942static struct file_system_type smk_fs_type = {
2943        .name           = "smackfs",
2944        .mount          = smk_mount,
2945        .kill_sb        = kill_litter_super,
2946};
2947
2948static struct vfsmount *smackfs_mount;
2949
2950static int __init smk_preset_netlabel(struct smack_known *skp)
2951{
2952        skp->smk_netlabel.domain = skp->smk_known;
2953        skp->smk_netlabel.flags =
2954                NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2955        return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2956                                &skp->smk_netlabel, strlen(skp->smk_known));
2957}
2958
2959/**
2960 * init_smk_fs - get the smackfs superblock
2961 *
2962 * register the smackfs
2963 *
2964 * Do not register smackfs if Smack wasn't enabled
2965 * on boot. We can not put this method normally under the
2966 * smack_init() code path since the security subsystem get
2967 * initialized before the vfs caches.
2968 *
2969 * Returns true if we were not chosen on boot or if
2970 * we were chosen and filesystem registration succeeded.
2971 */
2972static int __init init_smk_fs(void)
2973{
2974        int err;
2975        int rc;
2976
2977        if (smack_enabled == 0)
2978                return 0;
2979
2980        err = smk_init_sysfs();
2981        if (err)
2982                printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2983
2984        err = register_filesystem(&smk_fs_type);
2985        if (!err) {
2986                smackfs_mount = kern_mount(&smk_fs_type);
2987                if (IS_ERR(smackfs_mount)) {
2988                        printk(KERN_ERR "smackfs:  could not mount!\n");
2989                        err = PTR_ERR(smackfs_mount);
2990                        smackfs_mount = NULL;
2991                }
2992        }
2993
2994        smk_cipso_doi();
2995        smk_unlbl_ambient(NULL);
2996
2997        rc = smk_preset_netlabel(&smack_known_floor);
2998        if (err == 0 && rc < 0)
2999                err = rc;
3000        rc = smk_preset_netlabel(&smack_known_hat);
3001        if (err == 0 && rc < 0)
3002                err = rc;
3003        rc = smk_preset_netlabel(&smack_known_huh);
3004        if (err == 0 && rc < 0)
3005                err = rc;
3006        rc = smk_preset_netlabel(&smack_known_invalid);
3007        if (err == 0 && rc < 0)
3008                err = rc;
3009        rc = smk_preset_netlabel(&smack_known_star);
3010        if (err == 0 && rc < 0)
3011                err = rc;
3012        rc = smk_preset_netlabel(&smack_known_web);
3013        if (err == 0 && rc < 0)
3014                err = rc;
3015
3016        return err;
3017}
3018
3019__initcall(init_smk_fs);
3020
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