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/*
  33 * smackfs pseudo filesystem.
  34 */
  35
  36enum smk_inos {
  37        SMK_ROOT_INO    = 2,
  38        SMK_LOAD        = 3,    /* load policy */
  39        SMK_CIPSO       = 4,    /* load label -> CIPSO mapping */
  40        SMK_DOI         = 5,    /* CIPSO DOI */
  41        SMK_DIRECT      = 6,    /* CIPSO level indicating direct label */
  42        SMK_AMBIENT     = 7,    /* internet ambient label */
  43        SMK_NETLBLADDR  = 8,    /* single label hosts */
  44        SMK_ONLYCAP     = 9,    /* the only "capable" label */
  45        SMK_LOGGING     = 10,   /* logging */
  46        SMK_LOAD_SELF   = 11,   /* task specific rules */
  47        SMK_ACCESSES    = 12,   /* access policy */
  48        SMK_MAPPED      = 13,   /* CIPSO level indicating mapped label */
  49        SMK_LOAD2       = 14,   /* load policy with long labels */
  50        SMK_LOAD_SELF2  = 15,   /* load task specific rules with long labels */
  51        SMK_ACCESS2     = 16,   /* make an access check with long labels */
  52        SMK_CIPSO2      = 17,   /* load long label -> CIPSO mapping */
  53        SMK_REVOKE_SUBJ = 18,   /* set rules with subject label to '-' */
  54        SMK_CHANGE_RULE = 19,   /* change or add rules (long labels) */
  55        SMK_SYSLOG      = 20,   /* change syslog label) */
  56        SMK_PTRACE      = 21,   /* set ptrace rule */
  57};
  58
  59/*
  60 * List locks
  61 */
  62static DEFINE_MUTEX(smack_cipso_lock);
  63static DEFINE_MUTEX(smack_ambient_lock);
  64static DEFINE_MUTEX(smack_syslog_lock);
  65static DEFINE_MUTEX(smk_netlbladdr_lock);
  66
  67/*
  68 * This is the "ambient" label for network traffic.
  69 * If it isn't somehow marked, use this.
  70 * It can be reset via smackfs/ambient
  71 */
  72struct smack_known *smack_net_ambient;
  73
  74/*
  75 * This is the level in a CIPSO header that indicates a
  76 * smack label is contained directly in the category set.
  77 * It can be reset via smackfs/direct
  78 */
  79int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
  80
  81/*
  82 * This is the level in a CIPSO header that indicates a
  83 * secid is contained directly in the category set.
  84 * It can be reset via smackfs/mapped
  85 */
  86int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
  87
  88/*
  89 * Unless a process is running with this label even
  90 * having CAP_MAC_OVERRIDE isn't enough to grant
  91 * privilege to violate MAC policy. If no label is
  92 * designated (the NULL case) capabilities apply to
  93 * everyone. It is expected that the hat (^) label
  94 * will be used if any label is used.
  95 */
  96struct smack_known *smack_onlycap;
  97
  98/*
  99 * If this value is set restrict syslog use to the label specified.
 100 * It can be reset via smackfs/syslog
 101 */
 102struct smack_known *smack_syslog_label;
 103
 104/*
 105 * Ptrace current rule
 106 * SMACK_PTRACE_DEFAULT    regular smack ptrace rules (/proc based)
 107 * SMACK_PTRACE_EXACT      labels must match, but can be overriden with
 108 *                         CAP_SYS_PTRACE
 109 * SMACK_PTRACE_DRACONIAN  lables must match, CAP_SYS_PTRACE has no effect
 110 */
 111int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
 112
 113/*
 114 * Certain IP addresses may be designated as single label hosts.
 115 * Packets are sent there unlabeled, but only from tasks that
 116 * can write to the specified label.
 117 */
 118
 119LIST_HEAD(smk_netlbladdr_list);
 120
 121/*
 122 * Rule lists are maintained for each label.
 123 * This master list is just for reading /smack/load and /smack/load2.
 124 */
 125struct smack_master_list {
 126        struct list_head        list;
 127        struct smack_rule       *smk_rule;
 128};
 129
 130LIST_HEAD(smack_rule_list);
 131
 132struct smack_parsed_rule {
 133        struct smack_known      *smk_subject;
 134        struct smack_known      *smk_object;
 135        int                     smk_access1;
 136        int                     smk_access2;
 137};
 138
 139static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
 140
 141struct smack_known smack_cipso_option = {
 142        .smk_known      = SMACK_CIPSO_OPTION,
 143        .smk_secid      = 0,
 144};
 145
 146/*
 147 * Values for parsing cipso rules
 148 * SMK_DIGITLEN: Length of a digit field in a rule.
 149 * SMK_CIPSOMIN: Minimum possible cipso rule length.
 150 * SMK_CIPSOMAX: Maximum possible cipso rule length.
 151 */
 152#define SMK_DIGITLEN 4
 153#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
 154#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
 155
 156/*
 157 * Values for parsing MAC rules
 158 * SMK_ACCESS: Maximum possible combination of access permissions
 159 * SMK_ACCESSLEN: Maximum length for a rule access field
 160 * SMK_LOADLEN: Smack rule length
 161 */
 162#define SMK_OACCESS     "rwxa"
 163#define SMK_ACCESS      "rwxatl"
 164#define SMK_OACCESSLEN  (sizeof(SMK_OACCESS) - 1)
 165#define SMK_ACCESSLEN   (sizeof(SMK_ACCESS) - 1)
 166#define SMK_OLOADLEN    (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
 167#define SMK_LOADLEN     (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
 168
 169/*
 170 * Stricly for CIPSO level manipulation.
 171 * Set the category bit number in a smack label sized buffer.
 172 */
 173static inline void smack_catset_bit(unsigned int cat, char *catsetp)
 174{
 175        if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
 176                return;
 177
 178        catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
 179}
 180
 181/**
 182 * smk_netlabel_audit_set - fill a netlbl_audit struct
 183 * @nap: structure to fill
 184 */
 185static void smk_netlabel_audit_set(struct netlbl_audit *nap)
 186{
 187        struct smack_known *skp = smk_of_current();
 188
 189        nap->loginuid = audit_get_loginuid(current);
 190        nap->sessionid = audit_get_sessionid(current);
 191        nap->secid = skp->smk_secid;
 192}
 193
 194/*
 195 * Value for parsing single label host rules
 196 * "1.2.3.4 X"
 197 */
 198#define SMK_NETLBLADDRMIN       9
 199
 200/**
 201 * smk_set_access - add a rule to the rule list or replace an old rule
 202 * @srp: the rule to add or replace
 203 * @rule_list: the list of rules
 204 * @rule_lock: the rule list lock
 205 * @global: if non-zero, indicates a global rule
 206 *
 207 * Looks through the current subject/object/access list for
 208 * the subject/object pair and replaces the access that was
 209 * there. If the pair isn't found add it with the specified
 210 * access.
 211 *
 212 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
 213 * during the allocation of the new pair to add.
 214 */
 215static int smk_set_access(struct smack_parsed_rule *srp,
 216                                struct list_head *rule_list,
 217                                struct mutex *rule_lock, int global)
 218{
 219        struct smack_rule *sp;
 220        struct smack_master_list *smlp;
 221        int found = 0;
 222        int rc = 0;
 223
 224        mutex_lock(rule_lock);
 225
 226        /*
 227         * Because the object label is less likely to match
 228         * than the subject label check it first
 229         */
 230        list_for_each_entry_rcu(sp, rule_list, list) {
 231                if (sp->smk_object == srp->smk_object &&
 232                    sp->smk_subject == srp->smk_subject) {
 233                        found = 1;
 234                        sp->smk_access |= srp->smk_access1;
 235                        sp->smk_access &= ~srp->smk_access2;
 236                        break;
 237                }
 238        }
 239
 240        if (found == 0) {
 241                sp = kzalloc(sizeof(*sp), GFP_KERNEL);
 242                if (sp == NULL) {
 243                        rc = -ENOMEM;
 244                        goto out;
 245                }
 246
 247                sp->smk_subject = srp->smk_subject;
 248                sp->smk_object = srp->smk_object;
 249                sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
 250
 251                list_add_rcu(&sp->list, rule_list);
 252                /*
 253                 * If this is a global as opposed to self and a new rule
 254                 * it needs to get added for reporting.
 255                 */
 256                if (global) {
 257                        smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
 258                        if (smlp != NULL) {
 259                                smlp->smk_rule = sp;
 260                                list_add_rcu(&smlp->list, &smack_rule_list);
 261                        } else
 262                                rc = -ENOMEM;
 263                }
 264        }
 265
 266out:
 267        mutex_unlock(rule_lock);
 268        return rc;
 269}
 270
 271/**
 272 * smk_perm_from_str - parse smack accesses from a text string
 273 * @string: a text string that contains a Smack accesses code
 274 *
 275 * Returns an integer with respective bits set for specified accesses.
 276 */
 277static int smk_perm_from_str(const char *string)
 278{
 279        int perm = 0;
 280        const char *cp;
 281
 282        for (cp = string; ; cp++)
 283                switch (*cp) {
 284                case '-':
 285                        break;
 286                case 'r':
 287                case 'R':
 288                        perm |= MAY_READ;
 289                        break;
 290                case 'w':
 291                case 'W':
 292                        perm |= MAY_WRITE;
 293                        break;
 294                case 'x':
 295                case 'X':
 296                        perm |= MAY_EXEC;
 297                        break;
 298                case 'a':
 299                case 'A':
 300                        perm |= MAY_APPEND;
 301                        break;
 302                case 't':
 303                case 'T':
 304                        perm |= MAY_TRANSMUTE;
 305                        break;
 306                case 'l':
 307                case 'L':
 308                        perm |= MAY_LOCK;
 309                        break;
 310                case 'b':
 311                case 'B':
 312                        perm |= MAY_BRINGUP;
 313                        break;
 314                default:
 315                        return perm;
 316                }
 317}
 318
 319/**
 320 * smk_fill_rule - Fill Smack rule from strings
 321 * @subject: subject label string
 322 * @object: object label string
 323 * @access1: access string
 324 * @access2: string with permissions to be removed
 325 * @rule: Smack rule
 326 * @import: if non-zero, import labels
 327 * @len: label length limit
 328 *
 329 * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
 330 * or object is missing.
 331 */
 332static int smk_fill_rule(const char *subject, const char *object,
 333                                const char *access1, const char *access2,
 334                                struct smack_parsed_rule *rule, int import,
 335                                int len)
 336{
 337        const char *cp;
 338        struct smack_known *skp;
 339
 340        if (import) {
 341                rule->smk_subject = smk_import_entry(subject, len);
 342                if (rule->smk_subject == NULL)
 343                        return -EINVAL;
 344
 345                rule->smk_object = smk_import_entry(object, len);
 346                if (rule->smk_object == NULL)
 347                        return -EINVAL;
 348        } else {
 349                cp = smk_parse_smack(subject, len);
 350                if (cp == NULL)
 351                        return -EINVAL;
 352                skp = smk_find_entry(cp);
 353                kfree(cp);
 354                if (skp == NULL)
 355                        return -ENOENT;
 356                rule->smk_subject = skp;
 357
 358                cp = smk_parse_smack(object, len);
 359                if (cp == NULL)
 360                        return -EINVAL;
 361                skp = smk_find_entry(cp);
 362                kfree(cp);
 363                if (skp == NULL)
 364                        return -ENOENT;
 365                rule->smk_object = skp;
 366        }
 367
 368        rule->smk_access1 = smk_perm_from_str(access1);
 369        if (access2)
 370                rule->smk_access2 = smk_perm_from_str(access2);
 371        else
 372                rule->smk_access2 = ~rule->smk_access1;
 373
 374        return 0;
 375}
 376
 377/**
 378 * smk_parse_rule - parse Smack rule from load string
 379 * @data: string to be parsed whose size is SMK_LOADLEN
 380 * @rule: Smack rule
 381 * @import: if non-zero, import labels
 382 *
 383 * Returns 0 on success, -1 on errors.
 384 */
 385static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
 386                                int import)
 387{
 388        int rc;
 389
 390        rc = smk_fill_rule(data, data + SMK_LABELLEN,
 391                           data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
 392                           import, SMK_LABELLEN);
 393        return rc;
 394}
 395
 396/**
 397 * smk_parse_long_rule - parse Smack rule from rule string
 398 * @data: string to be parsed, null terminated
 399 * @rule: Will be filled with Smack parsed rule
 400 * @import: if non-zero, import labels
 401 * @tokens: numer of substrings expected in data
 402 *
 403 * Returns number of processed bytes on success, -1 on failure.
 404 */
 405static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
 406                                int import, int tokens)
 407{
 408        ssize_t cnt = 0;
 409        char *tok[4];
 410        int rc;
 411        int i;
 412
 413        /*
 414         * Parsing the rule in-place, filling all white-spaces with '\0'
 415         */
 416        for (i = 0; i < tokens; ++i) {
 417                while (isspace(data[cnt]))
 418                        data[cnt++] = '\0';
 419
 420                if (data[cnt] == '\0')
 421                        /* Unexpected end of data */
 422                        return -1;
 423
 424                tok[i] = data + cnt;
 425
 426                while (data[cnt] && !isspace(data[cnt]))
 427                        ++cnt;
 428        }
 429        while (isspace(data[cnt]))
 430                data[cnt++] = '\0';
 431
 432        while (i < 4)
 433                tok[i++] = NULL;
 434
 435        rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
 436        return rc == 0 ? cnt : rc;
 437}
 438
 439#define SMK_FIXED24_FMT 0       /* Fixed 24byte label format */
 440#define SMK_LONG_FMT    1       /* Variable long label format */
 441#define SMK_CHANGE_FMT  2       /* Rule modification format */
 442/**
 443 * smk_write_rules_list - write() for any /smack rule file
 444 * @file: file pointer, not actually used
 445 * @buf: where to get the data from
 446 * @count: bytes sent
 447 * @ppos: where to start - must be 0
 448 * @rule_list: the list of rules to write to
 449 * @rule_lock: lock for the rule list
 450 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
 451 *
 452 * Get one smack access rule from above.
 453 * The format for SMK_LONG_FMT is:
 454 *      "subject<whitespace>object<whitespace>access[<whitespace>...]"
 455 * The format for SMK_FIXED24_FMT is exactly:
 456 *      "subject                 object                  rwxat"
 457 * The format for SMK_CHANGE_FMT is:
 458 *      "subject<whitespace>object<whitespace>
 459 *       acc_enable<whitespace>acc_disable[<whitespace>...]"
 460 */
 461static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 462                                        size_t count, loff_t *ppos,
 463                                        struct list_head *rule_list,
 464                                        struct mutex *rule_lock, int format)
 465{
 466        struct smack_parsed_rule rule;
 467        char *data;
 468        int rc;
 469        int trunc = 0;
 470        int tokens;
 471        ssize_t cnt = 0;
 472
 473        /*
 474         * No partial writes.
 475         * Enough data must be present.
 476         */
 477        if (*ppos != 0)
 478                return -EINVAL;
 479
 480        if (format == SMK_FIXED24_FMT) {
 481                /*
 482                 * Minor hack for backward compatibility
 483                 */
 484                if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
 485                        return -EINVAL;
 486        } else {
 487                if (count >= PAGE_SIZE) {
 488                        count = PAGE_SIZE - 1;
 489                        trunc = 1;
 490                }
 491        }
 492
 493        data = kmalloc(count + 1, GFP_KERNEL);
 494        if (data == NULL)
 495                return -ENOMEM;
 496
 497        if (copy_from_user(data, buf, count) != 0) {
 498                rc = -EFAULT;
 499                goto out;
 500        }
 501
 502        /*
 503         * In case of parsing only part of user buf,
 504         * avoid having partial rule at the data buffer
 505         */
 506        if (trunc) {
 507                while (count > 0 && (data[count - 1] != '\n'))
 508                        --count;
 509                if (count == 0) {
 510                        rc = -EINVAL;
 511                        goto out;
 512                }
 513        }
 514
 515        data[count] = '\0';
 516        tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
 517        while (cnt < count) {
 518                if (format == SMK_FIXED24_FMT) {
 519                        rc = smk_parse_rule(data, &rule, 1);
 520                        if (rc != 0) {
 521                                rc = -EINVAL;
 522                                goto out;
 523                        }
 524                        cnt = count;
 525                } else {
 526                        rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
 527                        if (rc <= 0) {
 528                                rc = -EINVAL;
 529                                goto out;
 530                        }
 531                        cnt += rc;
 532                }
 533
 534                if (rule_list == NULL)
 535                        rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
 536                                &rule.smk_subject->smk_rules_lock, 1);
 537                else
 538                        rc = smk_set_access(&rule, rule_list, rule_lock, 0);
 539
 540                if (rc)
 541                        goto out;
 542        }
 543
 544        rc = cnt;
 545out:
 546        kfree(data);
 547        return rc;
 548}
 549
 550/*
 551 * Core logic for smackfs seq list operations.
 552 */
 553
 554static void *smk_seq_start(struct seq_file *s, loff_t *pos,
 555                                struct list_head *head)
 556{
 557        struct list_head *list;
 558
 559        /*
 560         * This is 0 the first time through.
 561         */
 562        if (s->index == 0)
 563                s->private = head;
 564
 565        if (s->private == NULL)
 566                return NULL;
 567
 568        list = s->private;
 569        if (list_empty(list))
 570                return NULL;
 571
 572        if (s->index == 0)
 573                return list->next;
 574        return list;
 575}
 576
 577static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
 578                                struct list_head *head)
 579{
 580        struct list_head *list = v;
 581
 582        if (list_is_last(list, head)) {
 583                s->private = NULL;
 584                return NULL;
 585        }
 586        s->private = list->next;
 587        return list->next;
 588}
 589
 590static void smk_seq_stop(struct seq_file *s, void *v)
 591{
 592        /* No-op */
 593}
 594
 595static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
 596{
 597        /*
 598         * Don't show any rules with label names too long for
 599         * interface file (/smack/load or /smack/load2)
 600         * because you should expect to be able to write
 601         * anything you read back.
 602         */
 603        if (strlen(srp->smk_subject->smk_known) >= max ||
 604            strlen(srp->smk_object->smk_known) >= max)
 605                return;
 606
 607        if (srp->smk_access == 0)
 608                return;
 609
 610        seq_printf(s, "%s %s",
 611                   srp->smk_subject->smk_known,
 612                   srp->smk_object->smk_known);
 613
 614        seq_putc(s, ' ');
 615
 616        if (srp->smk_access & MAY_READ)
 617                seq_putc(s, 'r');
 618        if (srp->smk_access & MAY_WRITE)
 619                seq_putc(s, 'w');
 620        if (srp->smk_access & MAY_EXEC)
 621                seq_putc(s, 'x');
 622        if (srp->smk_access & MAY_APPEND)
 623                seq_putc(s, 'a');
 624        if (srp->smk_access & MAY_TRANSMUTE)
 625                seq_putc(s, 't');
 626        if (srp->smk_access & MAY_LOCK)
 627                seq_putc(s, 'l');
 628        if (srp->smk_access & MAY_BRINGUP)
 629                seq_putc(s, 'b');
 630
 631        seq_putc(s, '\n');
 632}
 633
 634/*
 635 * Seq_file read operations for /smack/load
 636 */
 637
 638static void *load2_seq_start(struct seq_file *s, loff_t *pos)
 639{
 640        return smk_seq_start(s, pos, &smack_rule_list);
 641}
 642
 643static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
 644{
 645        return smk_seq_next(s, v, pos, &smack_rule_list);
 646}
 647
 648static int load_seq_show(struct seq_file *s, void *v)
 649{
 650        struct list_head *list = v;
 651        struct smack_master_list *smlp =
 652                 list_entry(list, struct smack_master_list, list);
 653
 654        smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
 655
 656        return 0;
 657}
 658
 659static const struct seq_operations load_seq_ops = {
 660        .start = load2_seq_start,
 661        .next  = load2_seq_next,
 662        .show  = load_seq_show,
 663        .stop  = smk_seq_stop,
 664};
 665
 666/**
 667 * smk_open_load - open() for /smack/load
 668 * @inode: inode structure representing file
 669 * @file: "load" file pointer
 670 *
 671 * For reading, use load_seq_* seq_file reading operations.
 672 */
 673static int smk_open_load(struct inode *inode, struct file *file)
 674{
 675        return seq_open(file, &load_seq_ops);
 676}
 677
 678/**
 679 * smk_write_load - write() for /smack/load
 680 * @file: file pointer, not actually used
 681 * @buf: where to get the data from
 682 * @count: bytes sent
 683 * @ppos: where to start - must be 0
 684 *
 685 */
 686static ssize_t smk_write_load(struct file *file, const char __user *buf,
 687                              size_t count, loff_t *ppos)
 688{
 689        /*
 690         * Must have privilege.
 691         * No partial writes.
 692         * Enough data must be present.
 693         */
 694        if (!smack_privileged(CAP_MAC_ADMIN))
 695                return -EPERM;
 696
 697        return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
 698                                    SMK_FIXED24_FMT);
 699}
 700
 701static const struct file_operations smk_load_ops = {
 702        .open           = smk_open_load,
 703        .read           = seq_read,
 704        .llseek         = seq_lseek,
 705        .write          = smk_write_load,
 706        .release        = seq_release,
 707};
 708
 709/**
 710 * smk_cipso_doi - initialize the CIPSO domain
 711 */
 712static void smk_cipso_doi(void)
 713{
 714        int rc;
 715        struct cipso_v4_doi *doip;
 716        struct netlbl_audit nai;
 717
 718        smk_netlabel_audit_set(&nai);
 719
 720        rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
 721        if (rc != 0)
 722                printk(KERN_WARNING "%s:%d remove rc = %d\n",
 723                       __func__, __LINE__, rc);
 724
 725        doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
 726        if (doip == NULL)
 727                panic("smack:  Failed to initialize cipso DOI.\n");
 728        doip->map.std = NULL;
 729        doip->doi = smk_cipso_doi_value;
 730        doip->type = CIPSO_V4_MAP_PASS;
 731        doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
 732        for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
 733                doip->tags[rc] = CIPSO_V4_TAG_INVALID;
 734
 735        rc = netlbl_cfg_cipsov4_add(doip, &nai);
 736        if (rc != 0) {
 737                printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
 738                       __func__, __LINE__, rc);
 739                kfree(doip);
 740                return;
 741        }
 742        rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
 743        if (rc != 0) {
 744                printk(KERN_WARNING "%s:%d map add rc = %d\n",
 745                       __func__, __LINE__, rc);
 746                kfree(doip);
 747                return;
 748        }
 749}
 750
 751/**
 752 * smk_unlbl_ambient - initialize the unlabeled domain
 753 * @oldambient: previous domain string
 754 */
 755static void smk_unlbl_ambient(char *oldambient)
 756{
 757        int rc;
 758        struct netlbl_audit nai;
 759
 760        smk_netlabel_audit_set(&nai);
 761
 762        if (oldambient != NULL) {
 763                rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
 764                if (rc != 0)
 765                        printk(KERN_WARNING "%s:%d remove rc = %d\n",
 766                               __func__, __LINE__, rc);
 767        }
 768        if (smack_net_ambient == NULL)
 769                smack_net_ambient = &smack_known_floor;
 770
 771        rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
 772                                      NULL, NULL, &nai);
 773        if (rc != 0)
 774                printk(KERN_WARNING "%s:%d add rc = %d\n",
 775                       __func__, __LINE__, rc);
 776}
 777
 778/*
 779 * Seq_file read operations for /smack/cipso
 780 */
 781
 782static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
 783{
 784        return smk_seq_start(s, pos, &smack_known_list);
 785}
 786
 787static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
 788{
 789        return smk_seq_next(s, v, pos, &smack_known_list);
 790}
 791
 792/*
 793 * Print cipso labels in format:
 794 * label level[/cat[,cat]]
 795 */
 796static int cipso_seq_show(struct seq_file *s, void *v)
 797{
 798        struct list_head  *list = v;
 799        struct smack_known *skp =
 800                 list_entry(list, struct smack_known, list);
 801        struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 802        char sep = '/';
 803        int i;
 804
 805        /*
 806         * Don't show a label that could not have been set using
 807         * /smack/cipso. This is in support of the notion that
 808         * anything read from /smack/cipso ought to be writeable
 809         * to /smack/cipso.
 810         *
 811         * /smack/cipso2 should be used instead.
 812         */
 813        if (strlen(skp->smk_known) >= SMK_LABELLEN)
 814                return 0;
 815
 816        seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 817
 818        for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
 819             i = netlbl_catmap_walk(cmp, i + 1)) {
 820                seq_printf(s, "%c%d", sep, i);
 821                sep = ',';
 822        }
 823
 824        seq_putc(s, '\n');
 825
 826        return 0;
 827}
 828
 829static const struct seq_operations cipso_seq_ops = {
 830        .start = cipso_seq_start,
 831        .next  = cipso_seq_next,
 832        .show  = cipso_seq_show,
 833        .stop  = smk_seq_stop,
 834};
 835
 836/**
 837 * smk_open_cipso - open() for /smack/cipso
 838 * @inode: inode structure representing file
 839 * @file: "cipso" file pointer
 840 *
 841 * Connect our cipso_seq_* operations with /smack/cipso
 842 * file_operations
 843 */
 844static int smk_open_cipso(struct inode *inode, struct file *file)
 845{
 846        return seq_open(file, &cipso_seq_ops);
 847}
 848
 849/**
 850 * smk_set_cipso - do the work for write() for cipso and cipso2
 851 * @file: file pointer, not actually used
 852 * @buf: where to get the data from
 853 * @count: bytes sent
 854 * @ppos: where to start
 855 * @format: /smack/cipso or /smack/cipso2
 856 *
 857 * Accepts only one cipso rule per write call.
 858 * Returns number of bytes written or error code, as appropriate
 859 */
 860static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 861                                size_t count, loff_t *ppos, int format)
 862{
 863        struct smack_known *skp;
 864        struct netlbl_lsm_secattr ncats;
 865        char mapcatset[SMK_CIPSOLEN];
 866        int maplevel;
 867        unsigned int cat;
 868        int catlen;
 869        ssize_t rc = -EINVAL;
 870        char *data = NULL;
 871        char *rule;
 872        int ret;
 873        int i;
 874
 875        /*
 876         * Must have privilege.
 877         * No partial writes.
 878         * Enough data must be present.
 879         */
 880        if (!smack_privileged(CAP_MAC_ADMIN))
 881                return -EPERM;
 882        if (*ppos != 0)
 883                return -EINVAL;
 884        if (format == SMK_FIXED24_FMT &&
 885            (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
 886                return -EINVAL;
 887
 888        data = kzalloc(count + 1, GFP_KERNEL);
 889        if (data == NULL)
 890                return -ENOMEM;
 891
 892        if (copy_from_user(data, buf, count) != 0) {
 893                rc = -EFAULT;
 894                goto unlockedout;
 895        }
 896
 897        data[count] = '\0';
 898        rule = data;
 899        /*
 900         * Only allow one writer at a time. Writes should be
 901         * quite rare and small in any case.
 902         */
 903        mutex_lock(&smack_cipso_lock);
 904
 905        skp = smk_import_entry(rule, 0);
 906        if (skp == NULL)
 907                goto out;
 908
 909        if (format == SMK_FIXED24_FMT)
 910                rule += SMK_LABELLEN;
 911        else
 912                rule += strlen(skp->smk_known) + 1;
 913
 914        ret = sscanf(rule, "%d", &maplevel);
 915        if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
 916                goto out;
 917
 918        rule += SMK_DIGITLEN;
 919        ret = sscanf(rule, "%d", &catlen);
 920        if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
 921                goto out;
 922
 923        if (format == SMK_FIXED24_FMT &&
 924            count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
 925                goto out;
 926
 927        memset(mapcatset, 0, sizeof(mapcatset));
 928
 929        for (i = 0; i < catlen; i++) {
 930                rule += SMK_DIGITLEN;
 931                ret = sscanf(rule, "%u", &cat);
 932                if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
 933                        goto out;
 934
 935                smack_catset_bit(cat, mapcatset);
 936        }
 937
 938        rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
 939        if (rc >= 0) {
 940                netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
 941                skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
 942                skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
 943                rc = count;
 944        }
 945
 946out:
 947        mutex_unlock(&smack_cipso_lock);
 948unlockedout:
 949        kfree(data);
 950        return rc;
 951}
 952
 953/**
 954 * smk_write_cipso - write() for /smack/cipso
 955 * @file: file pointer, not actually used
 956 * @buf: where to get the data from
 957 * @count: bytes sent
 958 * @ppos: where to start
 959 *
 960 * Accepts only one cipso rule per write call.
 961 * Returns number of bytes written or error code, as appropriate
 962 */
 963static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
 964                               size_t count, loff_t *ppos)
 965{
 966        return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
 967}
 968
 969static const struct file_operations smk_cipso_ops = {
 970        .open           = smk_open_cipso,
 971        .read           = seq_read,
 972        .llseek         = seq_lseek,
 973        .write          = smk_write_cipso,
 974        .release        = seq_release,
 975};
 976
 977/*
 978 * Seq_file read operations for /smack/cipso2
 979 */
 980
 981/*
 982 * Print cipso labels in format:
 983 * label level[/cat[,cat]]
 984 */
 985static int cipso2_seq_show(struct seq_file *s, void *v)
 986{
 987        struct list_head  *list = v;
 988        struct smack_known *skp =
 989                 list_entry(list, struct smack_known, list);
 990        struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 991        char sep = '/';
 992        int i;
 993
 994        seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 995
 996        for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
 997             i = netlbl_catmap_walk(cmp, i + 1)) {
 998                seq_printf(s, "%c%d", sep, i);
 999                sep = ',';
1000        }
1001
1002        seq_putc(s, '\n');
1003
1004        return 0;
1005}
1006
1007static const struct seq_operations cipso2_seq_ops = {
1008        .start = cipso_seq_start,
1009        .next  = cipso_seq_next,
1010        .show  = cipso2_seq_show,
1011        .stop  = smk_seq_stop,
1012};
1013
1014/**
1015 * smk_open_cipso2 - open() for /smack/cipso2
1016 * @inode: inode structure representing file
1017 * @file: "cipso2" file pointer
1018 *
1019 * Connect our cipso_seq_* operations with /smack/cipso2
1020 * file_operations
1021 */
1022static int smk_open_cipso2(struct inode *inode, struct file *file)
1023{
1024        return seq_open(file, &cipso2_seq_ops);
1025}
1026
1027/**
1028 * smk_write_cipso2 - write() for /smack/cipso2
1029 * @file: file pointer, not actually used
1030 * @buf: where to get the data from
1031 * @count: bytes sent
1032 * @ppos: where to start
1033 *
1034 * Accepts only one cipso rule per write call.
1035 * Returns number of bytes written or error code, as appropriate
1036 */
1037static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1038                              size_t count, loff_t *ppos)
1039{
1040        return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1041}
1042
1043static const struct file_operations smk_cipso2_ops = {
1044        .open           = smk_open_cipso2,
1045        .read           = seq_read,
1046        .llseek         = seq_lseek,
1047        .write          = smk_write_cipso2,
1048        .release        = seq_release,
1049};
1050
1051/*
1052 * Seq_file read operations for /smack/netlabel
1053 */
1054
1055static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
1056{
1057        return smk_seq_start(s, pos, &smk_netlbladdr_list);
1058}
1059
1060static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1061{
1062        return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
1063}
1064#define BEBITS  (sizeof(__be32) * 8)
1065
1066/*
1067 * Print host/label pairs
1068 */
1069static int netlbladdr_seq_show(struct seq_file *s, void *v)
1070{
1071        struct list_head *list = v;
1072        struct smk_netlbladdr *skp =
1073                         list_entry(list, struct smk_netlbladdr, list);
1074        unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
1075        int maskn;
1076        u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
1077
1078        for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
1079
1080        seq_printf(s, "%u.%u.%u.%u/%d %s\n",
1081                hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label->smk_known);
1082
1083        return 0;
1084}
1085
1086static const struct seq_operations netlbladdr_seq_ops = {
1087        .start = netlbladdr_seq_start,
1088        .next  = netlbladdr_seq_next,
1089        .show  = netlbladdr_seq_show,
1090        .stop  = smk_seq_stop,
1091};
1092
1093/**
1094 * smk_open_netlbladdr - open() for /smack/netlabel
1095 * @inode: inode structure representing file
1096 * @file: "netlabel" file pointer
1097 *
1098 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1099 * file_operations
1100 */
1101static int smk_open_netlbladdr(struct inode *inode, struct file *file)
1102{
1103        return seq_open(file, &netlbladdr_seq_ops);
1104}
1105
1106/**
1107 * smk_netlbladdr_insert
1108 * @new : netlabel to insert
1109 *
1110 * This helper insert netlabel in the smack_netlbladdrs list
1111 * sorted by netmask length (longest to smallest)
1112 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1113 *
1114 */
1115static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
1116{
1117        struct smk_netlbladdr *m, *m_next;
1118
1119        if (list_empty(&smk_netlbladdr_list)) {
1120                list_add_rcu(&new->list, &smk_netlbladdr_list);
1121                return;
1122        }
1123
1124        m = list_entry_rcu(smk_netlbladdr_list.next,
1125                           struct smk_netlbladdr, list);
1126
1127        /* the comparison '>' is a bit hacky, but works */
1128        if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
1129                list_add_rcu(&new->list, &smk_netlbladdr_list);
1130                return;
1131        }
1132
1133        list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
1134                if (list_is_last(&m->list, &smk_netlbladdr_list)) {
1135                        list_add_rcu(&new->list, &m->list);
1136                        return;
1137                }
1138                m_next = list_entry_rcu(m->list.next,
1139                                        struct smk_netlbladdr, list);
1140                if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
1141                        list_add_rcu(&new->list, &m->list);
1142                        return;
1143                }
1144        }
1145}
1146
1147
1148/**
1149 * smk_write_netlbladdr - write() for /smack/netlabel
1150 * @file: file pointer, not actually used
1151 * @buf: where to get the data from
1152 * @count: bytes sent
1153 * @ppos: where to start
1154 *
1155 * Accepts only one netlbladdr per write call.
1156 * Returns number of bytes written or error code, as appropriate
1157 */
1158static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
1159                                size_t count, loff_t *ppos)
1160{
1161        struct smk_netlbladdr *snp;
1162        struct sockaddr_in newname;
1163        char *smack;
1164        struct smack_known *skp;
1165        char *data;
1166        char *host = (char *)&newname.sin_addr.s_addr;
1167        int rc;
1168        struct netlbl_audit audit_info;
1169        struct in_addr mask;
1170        unsigned int m;
1171        int found;
1172        u32 mask_bits = (1<<31);
1173        __be32 nsa;
1174        u32 temp_mask;
1175
1176        /*
1177         * Must have privilege.
1178         * No partial writes.
1179         * Enough data must be present.
1180         * "<addr/mask, as a.b.c.d/e><space><label>"
1181         * "<addr, as a.b.c.d><space><label>"
1182         */
1183        if (!smack_privileged(CAP_MAC_ADMIN))
1184                return -EPERM;
1185        if (*ppos != 0)
1186                return -EINVAL;
1187        if (count < SMK_NETLBLADDRMIN)
1188                return -EINVAL;
1189
1190        data = kzalloc(count + 1, GFP_KERNEL);
1191        if (data == NULL)
1192                return -ENOMEM;
1193
1194        if (copy_from_user(data, buf, count) != 0) {
1195                rc = -EFAULT;
1196                goto free_data_out;
1197        }
1198
1199        smack = kzalloc(count + 1, GFP_KERNEL);
1200        if (smack == NULL) {
1201                rc = -ENOMEM;
1202                goto free_data_out;
1203        }
1204
1205        data[count] = '\0';
1206
1207        rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1208                &host[0], &host[1], &host[2], &host[3], &m, smack);
1209        if (rc != 6) {
1210                rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1211                        &host[0], &host[1], &host[2], &host[3], smack);
1212                if (rc != 5) {
1213                        rc = -EINVAL;
1214                        goto free_out;
1215                }
1216                m = BEBITS;
1217        }
1218        if (m > BEBITS) {
1219                rc = -EINVAL;
1220                goto free_out;
1221        }
1222
1223        /*
1224         * If smack begins with '-', it is an option, don't import it
1225         */
1226        if (smack[0] != '-') {
1227                skp = smk_import_entry(smack, 0);
1228                if (skp == NULL) {
1229                        rc = -EINVAL;
1230                        goto free_out;
1231                }
1232        } else {
1233                /* check known options */
1234                if (strcmp(smack, smack_cipso_option.smk_known) == 0)
1235                        skp = &smack_cipso_option;
1236                else {
1237                        rc = -EINVAL;
1238                        goto free_out;
1239                }
1240        }
1241
1242        for (temp_mask = 0; m > 0; m--) {
1243                temp_mask |= mask_bits;
1244                mask_bits >>= 1;
1245        }
1246        mask.s_addr = cpu_to_be32(temp_mask);
1247
1248        newname.sin_addr.s_addr &= mask.s_addr;
1249        /*
1250         * Only allow one writer at a time. Writes should be
1251         * quite rare and small in any case.
1252         */
1253        mutex_lock(&smk_netlbladdr_lock);
1254
1255        nsa = newname.sin_addr.s_addr;
1256        /* try to find if the prefix is already in the list */
1257        found = 0;
1258        list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) {
1259                if (snp->smk_host.sin_addr.s_addr == nsa &&
1260                    snp->smk_mask.s_addr == mask.s_addr) {
1261                        found = 1;
1262                        break;
1263                }
1264        }
1265        smk_netlabel_audit_set(&audit_info);
1266
1267        if (found == 0) {
1268                snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1269                if (snp == NULL)
1270                        rc = -ENOMEM;
1271                else {
1272                        rc = 0;
1273                        snp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
1274                        snp->smk_mask.s_addr = mask.s_addr;
1275                        snp->smk_label = skp;
1276                        smk_netlbladdr_insert(snp);
1277                }
1278        } else {
1279                /* we delete the unlabeled entry, only if the previous label
1280                 * wasn't the special CIPSO option */
1281                if (snp->smk_label != &smack_cipso_option)
1282                        rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1283                                        &snp->smk_host.sin_addr, &snp->smk_mask,
1284                                        PF_INET, &audit_info);
1285                else
1286                        rc = 0;
1287                snp->smk_label = skp;
1288        }
1289
1290        /*
1291         * Now tell netlabel about the single label nature of
1292         * this host so that incoming packets get labeled.
1293         * but only if we didn't get the special CIPSO option
1294         */
1295        if (rc == 0 && skp != &smack_cipso_option)
1296                rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1297                        &snp->smk_host.sin_addr, &snp->smk_mask, PF_INET,
1298                        snp->smk_label->smk_secid, &audit_info);
1299
1300        if (rc == 0)
1301                rc = count;
1302
1303        mutex_unlock(&smk_netlbladdr_lock);
1304
1305free_out:
1306        kfree(smack);
1307free_data_out:
1308        kfree(data);
1309
1310        return rc;
1311}
1312
1313static const struct file_operations smk_netlbladdr_ops = {
1314        .open           = smk_open_netlbladdr,
1315        .read           = seq_read,
1316        .llseek         = seq_lseek,
1317        .write          = smk_write_netlbladdr,
1318        .release        = seq_release,
1319};
1320
1321/**
1322 * smk_read_doi - read() for /smack/doi
1323 * @filp: file pointer, not actually used
1324 * @buf: where to put the result
1325 * @count: maximum to send along
1326 * @ppos: where to start
1327 *
1328 * Returns number of bytes read or error code, as appropriate
1329 */
1330static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1331                            size_t count, loff_t *ppos)
1332{
1333        char temp[80];
1334        ssize_t rc;
1335
1336        if (*ppos != 0)
1337                return 0;
1338
1339        sprintf(temp, "%d", smk_cipso_doi_value);
1340        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1341
1342        return rc;
1343}
1344
1345/**
1346 * smk_write_doi - write() for /smack/doi
1347 * @file: file pointer, not actually used
1348 * @buf: where to get the data from
1349 * @count: bytes sent
1350 * @ppos: where to start
1351 *
1352 * Returns number of bytes written or error code, as appropriate
1353 */
1354static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1355                             size_t count, loff_t *ppos)
1356{
1357        char temp[80];
1358        int i;
1359
1360        if (!smack_privileged(CAP_MAC_ADMIN))
1361                return -EPERM;
1362
1363        if (count >= sizeof(temp) || count == 0)
1364                return -EINVAL;
1365
1366        if (copy_from_user(temp, buf, count) != 0)
1367                return -EFAULT;
1368
1369        temp[count] = '\0';
1370
1371        if (sscanf(temp, "%d", &i) != 1)
1372                return -EINVAL;
1373
1374        smk_cipso_doi_value = i;
1375
1376        smk_cipso_doi();
1377
1378        return count;
1379}
1380
1381static const struct file_operations smk_doi_ops = {
1382        .read           = smk_read_doi,
1383        .write          = smk_write_doi,
1384        .llseek         = default_llseek,
1385};
1386
1387/**
1388 * smk_read_direct - read() for /smack/direct
1389 * @filp: file pointer, not actually used
1390 * @buf: where to put the result
1391 * @count: maximum to send along
1392 * @ppos: where to start
1393 *
1394 * Returns number of bytes read or error code, as appropriate
1395 */
1396static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1397                               size_t count, loff_t *ppos)
1398{
1399        char temp[80];
1400        ssize_t rc;
1401
1402        if (*ppos != 0)
1403                return 0;
1404
1405        sprintf(temp, "%d", smack_cipso_direct);
1406        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1407
1408        return rc;
1409}
1410
1411/**
1412 * smk_write_direct - write() for /smack/direct
1413 * @file: file pointer, not actually used
1414 * @buf: where to get the data from
1415 * @count: bytes sent
1416 * @ppos: where to start
1417 *
1418 * Returns number of bytes written or error code, as appropriate
1419 */
1420static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1421                                size_t count, loff_t *ppos)
1422{
1423        struct smack_known *skp;
1424        char temp[80];
1425        int i;
1426
1427        if (!smack_privileged(CAP_MAC_ADMIN))
1428                return -EPERM;
1429
1430        if (count >= sizeof(temp) || count == 0)
1431                return -EINVAL;
1432
1433        if (copy_from_user(temp, buf, count) != 0)
1434                return -EFAULT;
1435
1436        temp[count] = '\0';
1437
1438        if (sscanf(temp, "%d", &i) != 1)
1439                return -EINVAL;
1440
1441        /*
1442         * Don't do anything if the value hasn't actually changed.
1443         * If it is changing reset the level on entries that were
1444         * set up to be direct when they were created.
1445         */
1446        if (smack_cipso_direct != i) {
1447                mutex_lock(&smack_known_lock);
1448                list_for_each_entry_rcu(skp, &smack_known_list, list)
1449                        if (skp->smk_netlabel.attr.mls.lvl ==
1450                            smack_cipso_direct)
1451                                skp->smk_netlabel.attr.mls.lvl = i;
1452                smack_cipso_direct = i;
1453                mutex_unlock(&smack_known_lock);
1454        }
1455
1456        return count;
1457}
1458
1459static const struct file_operations smk_direct_ops = {
1460        .read           = smk_read_direct,
1461        .write          = smk_write_direct,
1462        .llseek         = default_llseek,
1463};
1464
1465/**
1466 * smk_read_mapped - read() for /smack/mapped
1467 * @filp: file pointer, not actually used
1468 * @buf: where to put the result
1469 * @count: maximum to send along
1470 * @ppos: where to start
1471 *
1472 * Returns number of bytes read or error code, as appropriate
1473 */
1474static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1475                               size_t count, loff_t *ppos)
1476{
1477        char temp[80];
1478        ssize_t rc;
1479
1480        if (*ppos != 0)
1481                return 0;
1482
1483        sprintf(temp, "%d", smack_cipso_mapped);
1484        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1485
1486        return rc;
1487}
1488
1489/**
1490 * smk_write_mapped - write() for /smack/mapped
1491 * @file: file pointer, not actually used
1492 * @buf: where to get the data from
1493 * @count: bytes sent
1494 * @ppos: where to start
1495 *
1496 * Returns number of bytes written or error code, as appropriate
1497 */
1498static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1499                                size_t count, loff_t *ppos)
1500{
1501        struct smack_known *skp;
1502        char temp[80];
1503        int i;
1504
1505        if (!smack_privileged(CAP_MAC_ADMIN))
1506                return -EPERM;
1507
1508        if (count >= sizeof(temp) || count == 0)
1509                return -EINVAL;
1510
1511        if (copy_from_user(temp, buf, count) != 0)
1512                return -EFAULT;
1513
1514        temp[count] = '\0';
1515
1516        if (sscanf(temp, "%d", &i) != 1)
1517                return -EINVAL;
1518
1519        /*
1520         * Don't do anything if the value hasn't actually changed.
1521         * If it is changing reset the level on entries that were
1522         * set up to be mapped when they were created.
1523         */
1524        if (smack_cipso_mapped != i) {
1525                mutex_lock(&smack_known_lock);
1526                list_for_each_entry_rcu(skp, &smack_known_list, list)
1527                        if (skp->smk_netlabel.attr.mls.lvl ==
1528                            smack_cipso_mapped)
1529                                skp->smk_netlabel.attr.mls.lvl = i;
1530                smack_cipso_mapped = i;
1531                mutex_unlock(&smack_known_lock);
1532        }
1533
1534        return count;
1535}
1536
1537static const struct file_operations smk_mapped_ops = {
1538        .read           = smk_read_mapped,
1539        .write          = smk_write_mapped,
1540        .llseek         = default_llseek,
1541};
1542
1543/**
1544 * smk_read_ambient - read() for /smack/ambient
1545 * @filp: file pointer, not actually used
1546 * @buf: where to put the result
1547 * @cn: maximum to send along
1548 * @ppos: where to start
1549 *
1550 * Returns number of bytes read or error code, as appropriate
1551 */
1552static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1553                                size_t cn, loff_t *ppos)
1554{
1555        ssize_t rc;
1556        int asize;
1557
1558        if (*ppos != 0)
1559                return 0;
1560        /*
1561         * Being careful to avoid a problem in the case where
1562         * smack_net_ambient gets changed in midstream.
1563         */
1564        mutex_lock(&smack_ambient_lock);
1565
1566        asize = strlen(smack_net_ambient->smk_known) + 1;
1567
1568        if (cn >= asize)
1569                rc = simple_read_from_buffer(buf, cn, ppos,
1570                                             smack_net_ambient->smk_known,
1571                                             asize);
1572        else
1573                rc = -EINVAL;
1574
1575        mutex_unlock(&smack_ambient_lock);
1576
1577        return rc;
1578}
1579
1580/**
1581 * smk_write_ambient - write() for /smack/ambient
1582 * @file: file pointer, not actually used
1583 * @buf: where to get the data from
1584 * @count: bytes sent
1585 * @ppos: where to start
1586 *
1587 * Returns number of bytes written or error code, as appropriate
1588 */
1589static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1590                                 size_t count, loff_t *ppos)
1591{
1592        struct smack_known *skp;
1593        char *oldambient;
1594        char *data;
1595        int rc = count;
1596
1597        if (!smack_privileged(CAP_MAC_ADMIN))
1598                return -EPERM;
1599
1600        data = kzalloc(count + 1, GFP_KERNEL);
1601        if (data == NULL)
1602                return -ENOMEM;
1603
1604        if (copy_from_user(data, buf, count) != 0) {
1605                rc = -EFAULT;
1606                goto out;
1607        }
1608
1609        skp = smk_import_entry(data, count);
1610        if (skp == NULL) {
1611                rc = -EINVAL;
1612                goto out;
1613        }
1614
1615        mutex_lock(&smack_ambient_lock);
1616
1617        oldambient = smack_net_ambient->smk_known;
1618        smack_net_ambient = skp;
1619        smk_unlbl_ambient(oldambient);
1620
1621        mutex_unlock(&smack_ambient_lock);
1622
1623out:
1624        kfree(data);
1625        return rc;
1626}
1627
1628static const struct file_operations smk_ambient_ops = {
1629        .read           = smk_read_ambient,
1630        .write          = smk_write_ambient,
1631        .llseek         = default_llseek,
1632};
1633
1634/**
1635 * smk_read_onlycap - read() for smackfs/onlycap
1636 * @filp: file pointer, not actually used
1637 * @buf: where to put the result
1638 * @cn: maximum to send along
1639 * @ppos: where to start
1640 *
1641 * Returns number of bytes read or error code, as appropriate
1642 */
1643static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1644                                size_t cn, loff_t *ppos)
1645{
1646        char *smack = "";
1647        ssize_t rc = -EINVAL;
1648        int asize;
1649
1650        if (*ppos != 0)
1651                return 0;
1652
1653        if (smack_onlycap != NULL)
1654                smack = smack_onlycap->smk_known;
1655
1656        asize = strlen(smack) + 1;
1657
1658        if (cn >= asize)
1659                rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1660
1661        return rc;
1662}
1663
1664/**
1665 * smk_write_onlycap - write() for smackfs/onlycap
1666 * @file: file pointer, not actually used
1667 * @buf: where to get the data from
1668 * @count: bytes sent
1669 * @ppos: where to start
1670 *
1671 * Returns number of bytes written or error code, as appropriate
1672 */
1673static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1674                                 size_t count, loff_t *ppos)
1675{
1676        char *data;
1677        struct smack_known *skp = smk_of_task(current->cred->security);
1678        int rc = count;
1679
1680        if (!smack_privileged(CAP_MAC_ADMIN))
1681                return -EPERM;
1682
1683        /*
1684         * This can be done using smk_access() but is done
1685         * explicitly for clarity. The smk_access() implementation
1686         * would use smk_access(smack_onlycap, MAY_WRITE)
1687         */
1688        if (smack_onlycap != NULL && smack_onlycap != skp)
1689                return -EPERM;
1690
1691        data = kzalloc(count + 1, GFP_KERNEL);
1692        if (data == NULL)
1693                return -ENOMEM;
1694
1695        /*
1696         * Should the null string be passed in unset the onlycap value.
1697         * This seems like something to be careful with as usually
1698         * smk_import only expects to return NULL for errors. It
1699         * is usually the case that a nullstring or "\n" would be
1700         * bad to pass to smk_import but in fact this is useful here.
1701         *
1702         * smk_import will also reject a label beginning with '-',
1703         * so "-usecapabilities" will also work.
1704         */
1705        if (copy_from_user(data, buf, count) != 0)
1706                rc = -EFAULT;
1707        else
1708                smack_onlycap = smk_import_entry(data, count);
1709
1710        kfree(data);
1711        return rc;
1712}
1713
1714static const struct file_operations smk_onlycap_ops = {
1715        .read           = smk_read_onlycap,
1716        .write          = smk_write_onlycap,
1717        .llseek         = default_llseek,
1718};
1719
1720/**
1721 * smk_read_logging - read() for /smack/logging
1722 * @filp: file pointer, not actually used
1723 * @buf: where to put the result
1724 * @cn: maximum to send along
1725 * @ppos: where to start
1726 *
1727 * Returns number of bytes read or error code, as appropriate
1728 */
1729static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1730                                size_t count, loff_t *ppos)
1731{
1732        char temp[32];
1733        ssize_t rc;
1734
1735        if (*ppos != 0)
1736                return 0;
1737
1738        sprintf(temp, "%d\n", log_policy);
1739        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1740        return rc;
1741}
1742
1743/**
1744 * smk_write_logging - write() for /smack/logging
1745 * @file: file pointer, not actually used
1746 * @buf: where to get the data from
1747 * @count: bytes sent
1748 * @ppos: where to start
1749 *
1750 * Returns number of bytes written or error code, as appropriate
1751 */
1752static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1753                                size_t count, loff_t *ppos)
1754{
1755        char temp[32];
1756        int i;
1757
1758        if (!smack_privileged(CAP_MAC_ADMIN))
1759                return -EPERM;
1760
1761        if (count >= sizeof(temp) || count == 0)
1762                return -EINVAL;
1763
1764        if (copy_from_user(temp, buf, count) != 0)
1765                return -EFAULT;
1766
1767        temp[count] = '\0';
1768
1769        if (sscanf(temp, "%d", &i) != 1)
1770                return -EINVAL;
1771        if (i < 0 || i > 3)
1772                return -EINVAL;
1773        log_policy = i;
1774        return count;
1775}
1776
1777
1778
1779static const struct file_operations smk_logging_ops = {
1780        .read           = smk_read_logging,
1781        .write          = smk_write_logging,
1782        .llseek         = default_llseek,
1783};
1784
1785/*
1786 * Seq_file read operations for /smack/load-self
1787 */
1788
1789static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1790{
1791        struct task_smack *tsp = current_security();
1792
1793        return smk_seq_start(s, pos, &tsp->smk_rules);
1794}
1795
1796static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1797{
1798        struct task_smack *tsp = current_security();
1799
1800        return smk_seq_next(s, v, pos, &tsp->smk_rules);
1801}
1802
1803static int load_self_seq_show(struct seq_file *s, void *v)
1804{
1805        struct list_head *list = v;
1806        struct smack_rule *srp =
1807                 list_entry(list, struct smack_rule, list);
1808
1809        smk_rule_show(s, srp, SMK_LABELLEN);
1810
1811        return 0;
1812}
1813
1814static const struct seq_operations load_self_seq_ops = {
1815        .start = load_self_seq_start,
1816        .next  = load_self_seq_next,
1817        .show  = load_self_seq_show,
1818        .stop  = smk_seq_stop,
1819};
1820
1821
1822/**
1823 * smk_open_load_self - open() for /smack/load-self2
1824 * @inode: inode structure representing file
1825 * @file: "load" file pointer
1826 *
1827 * For reading, use load_seq_* seq_file reading operations.
1828 */
1829static int smk_open_load_self(struct inode *inode, struct file *file)
1830{
1831        return seq_open(file, &load_self_seq_ops);
1832}
1833
1834/**
1835 * smk_write_load_self - write() for /smack/load-self
1836 * @file: file pointer, not actually used
1837 * @buf: where to get the data from
1838 * @count: bytes sent
1839 * @ppos: where to start - must be 0
1840 *
1841 */
1842static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1843                              size_t count, loff_t *ppos)
1844{
1845        struct task_smack *tsp = current_security();
1846
1847        return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1848                                    &tsp->smk_rules_lock, SMK_FIXED24_FMT);
1849}
1850
1851static const struct file_operations smk_load_self_ops = {
1852        .open           = smk_open_load_self,
1853        .read           = seq_read,
1854        .llseek         = seq_lseek,
1855        .write          = smk_write_load_self,
1856        .release        = seq_release,
1857};
1858
1859/**
1860 * smk_user_access - handle access check transaction
1861 * @file: file pointer
1862 * @buf: data from user space
1863 * @count: bytes sent
1864 * @ppos: where to start - must be 0
1865 */
1866static ssize_t smk_user_access(struct file *file, const char __user *buf,
1867                                size_t count, loff_t *ppos, int format)
1868{
1869        struct smack_parsed_rule rule;
1870        char *data;
1871        int res;
1872
1873        data = simple_transaction_get(file, buf, count);
1874        if (IS_ERR(data))
1875                return PTR_ERR(data);
1876
1877        if (format == SMK_FIXED24_FMT) {
1878                if (count < SMK_LOADLEN)
1879                        return -EINVAL;
1880                res = smk_parse_rule(data, &rule, 0);
1881        } else {
1882                /*
1883                 * simple_transaction_get() returns null-terminated data
1884                 */
1885                res = smk_parse_long_rule(data, &rule, 0, 3);
1886        }
1887
1888        if (res >= 0)
1889                res = smk_access(rule.smk_subject, rule.smk_object,
1890                                 rule.smk_access1, NULL);
1891        else if (res != -ENOENT)
1892                return -EINVAL;
1893
1894        /*
1895         * smk_access() can return a value > 0 in the "bringup" case.
1896         */
1897        data[0] = res >= 0 ? '1' : '0';
1898        data[1] = '\0';
1899
1900        simple_transaction_set(file, 2);
1901
1902        if (format == SMK_FIXED24_FMT)
1903                return SMK_LOADLEN;
1904        return count;
1905}
1906
1907/**
1908 * smk_write_access - handle access check transaction
1909 * @file: file pointer
1910 * @buf: data from user space
1911 * @count: bytes sent
1912 * @ppos: where to start - must be 0
1913 */
1914static ssize_t smk_write_access(struct file *file, const char __user *buf,
1915                                size_t count, loff_t *ppos)
1916{
1917        return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
1918}
1919
1920static const struct file_operations smk_access_ops = {
1921        .write          = smk_write_access,
1922        .read           = simple_transaction_read,
1923        .release        = simple_transaction_release,
1924        .llseek         = generic_file_llseek,
1925};
1926
1927
1928/*
1929 * Seq_file read operations for /smack/load2
1930 */
1931
1932static int load2_seq_show(struct seq_file *s, void *v)
1933{
1934        struct list_head *list = v;
1935        struct smack_master_list *smlp =
1936                 list_entry(list, struct smack_master_list, list);
1937
1938        smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
1939
1940        return 0;
1941}
1942
1943static const struct seq_operations load2_seq_ops = {
1944        .start = load2_seq_start,
1945        .next  = load2_seq_next,
1946        .show  = load2_seq_show,
1947        .stop  = smk_seq_stop,
1948};
1949
1950/**
1951 * smk_open_load2 - open() for /smack/load2
1952 * @inode: inode structure representing file
1953 * @file: "load2" file pointer
1954 *
1955 * For reading, use load2_seq_* seq_file reading operations.
1956 */
1957static int smk_open_load2(struct inode *inode, struct file *file)
1958{
1959        return seq_open(file, &load2_seq_ops);
1960}
1961
1962/**
1963 * smk_write_load2 - write() for /smack/load2
1964 * @file: file pointer, not actually used
1965 * @buf: where to get the data from
1966 * @count: bytes sent
1967 * @ppos: where to start - must be 0
1968 *
1969 */
1970static ssize_t smk_write_load2(struct file *file, const char __user *buf,
1971                                size_t count, loff_t *ppos)
1972{
1973        /*
1974         * Must have privilege.
1975         */
1976        if (!smack_privileged(CAP_MAC_ADMIN))
1977                return -EPERM;
1978
1979        return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
1980                                    SMK_LONG_FMT);
1981}
1982
1983static const struct file_operations smk_load2_ops = {
1984        .open           = smk_open_load2,
1985        .read           = seq_read,
1986        .llseek         = seq_lseek,
1987        .write          = smk_write_load2,
1988        .release        = seq_release,
1989};
1990
1991/*
1992 * Seq_file read operations for /smack/load-self2
1993 */
1994
1995static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
1996{
1997        struct task_smack *tsp = current_security();
1998
1999        return smk_seq_start(s, pos, &tsp->smk_rules);
2000}
2001
2002static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2003{
2004        struct task_smack *tsp = current_security();
2005
2006        return smk_seq_next(s, v, pos, &tsp->smk_rules);
2007}
2008
2009static int load_self2_seq_show(struct seq_file *s, void *v)
2010{
2011        struct list_head *list = v;
2012        struct smack_rule *srp =
2013                 list_entry(list, struct smack_rule, list);
2014
2015        smk_rule_show(s, srp, SMK_LONGLABEL);
2016
2017        return 0;
2018}
2019
2020static const struct seq_operations load_self2_seq_ops = {
2021        .start = load_self2_seq_start,
2022        .next  = load_self2_seq_next,
2023        .show  = load_self2_seq_show,
2024        .stop  = smk_seq_stop,
2025};
2026
2027/**
2028 * smk_open_load_self2 - open() for /smack/load-self2
2029 * @inode: inode structure representing file
2030 * @file: "load" file pointer
2031 *
2032 * For reading, use load_seq_* seq_file reading operations.
2033 */
2034static int smk_open_load_self2(struct inode *inode, struct file *file)
2035{
2036        return seq_open(file, &load_self2_seq_ops);
2037}
2038
2039/**
2040 * smk_write_load_self2 - write() for /smack/load-self2
2041 * @file: file pointer, not actually used
2042 * @buf: where to get the data from
2043 * @count: bytes sent
2044 * @ppos: where to start - must be 0
2045 *
2046 */
2047static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2048                              size_t count, loff_t *ppos)
2049{
2050        struct task_smack *tsp = current_security();
2051
2052        return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2053                                    &tsp->smk_rules_lock, SMK_LONG_FMT);
2054}
2055
2056static const struct file_operations smk_load_self2_ops = {
2057        .open           = smk_open_load_self2,
2058        .read           = seq_read,
2059        .llseek         = seq_lseek,
2060        .write          = smk_write_load_self2,
2061        .release        = seq_release,
2062};
2063
2064/**
2065 * smk_write_access2 - handle access check transaction
2066 * @file: file pointer
2067 * @buf: data from user space
2068 * @count: bytes sent
2069 * @ppos: where to start - must be 0
2070 */
2071static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2072                                        size_t count, loff_t *ppos)
2073{
2074        return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2075}
2076
2077static const struct file_operations smk_access2_ops = {
2078        .write          = smk_write_access2,
2079        .read           = simple_transaction_read,
2080        .release        = simple_transaction_release,
2081        .llseek         = generic_file_llseek,
2082};
2083
2084/**
2085 * smk_write_revoke_subj - write() for /smack/revoke-subject
2086 * @file: file pointer
2087 * @buf: data from user space
2088 * @count: bytes sent
2089 * @ppos: where to start - must be 0
2090 */
2091static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2092                                size_t count, loff_t *ppos)
2093{
2094        char *data = NULL;
2095        const char *cp = NULL;
2096        struct smack_known *skp;
2097        struct smack_rule *sp;
2098        struct list_head *rule_list;
2099        struct mutex *rule_lock;
2100        int rc = count;
2101
2102        if (*ppos != 0)
2103                return -EINVAL;
2104
2105        if (!smack_privileged(CAP_MAC_ADMIN))
2106                return -EPERM;
2107
2108        if (count == 0 || count > SMK_LONGLABEL)
2109                return -EINVAL;
2110
2111        data = kzalloc(count, GFP_KERNEL);
2112        if (data == NULL)
2113                return -ENOMEM;
2114
2115        if (copy_from_user(data, buf, count) != 0) {
2116                rc = -EFAULT;
2117                goto free_out;
2118        }
2119
2120        cp = smk_parse_smack(data, count);
2121        if (cp == NULL) {
2122                rc = -EINVAL;
2123                goto free_out;
2124        }
2125
2126        skp = smk_find_entry(cp);
2127        if (skp == NULL)
2128                goto free_out;
2129
2130        rule_list = &skp->smk_rules;
2131        rule_lock = &skp->smk_rules_lock;
2132
2133        mutex_lock(rule_lock);
2134
2135        list_for_each_entry_rcu(sp, rule_list, list)
2136                sp->smk_access = 0;
2137
2138        mutex_unlock(rule_lock);
2139
2140free_out:
2141        kfree(data);
2142        kfree(cp);
2143        return rc;
2144}
2145
2146static const struct file_operations smk_revoke_subj_ops = {
2147        .write          = smk_write_revoke_subj,
2148        .read           = simple_transaction_read,
2149        .release        = simple_transaction_release,
2150        .llseek         = generic_file_llseek,
2151};
2152
2153static struct kset *smackfs_kset;
2154/**
2155 * smk_init_sysfs - initialize /sys/fs/smackfs
2156 *
2157 */
2158static int smk_init_sysfs(void)
2159{
2160        smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj);
2161        if (!smackfs_kset)
2162                return -ENOMEM;
2163        return 0;
2164}
2165
2166/**
2167 * smk_write_change_rule - write() for /smack/change-rule
2168 * @file: file pointer
2169 * @buf: data from user space
2170 * @count: bytes sent
2171 * @ppos: where to start - must be 0
2172 */
2173static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2174                                size_t count, loff_t *ppos)
2175{
2176        /*
2177         * Must have privilege.
2178         */
2179        if (!smack_privileged(CAP_MAC_ADMIN))
2180                return -EPERM;
2181
2182        return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2183                                    SMK_CHANGE_FMT);
2184}
2185
2186static const struct file_operations smk_change_rule_ops = {
2187        .write          = smk_write_change_rule,
2188        .read           = simple_transaction_read,
2189        .release        = simple_transaction_release,
2190        .llseek         = generic_file_llseek,
2191};
2192
2193/**
2194 * smk_read_syslog - read() for smackfs/syslog
2195 * @filp: file pointer, not actually used
2196 * @buf: where to put the result
2197 * @cn: maximum to send along
2198 * @ppos: where to start
2199 *
2200 * Returns number of bytes read or error code, as appropriate
2201 */
2202static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2203                                size_t cn, loff_t *ppos)
2204{
2205        struct smack_known *skp;
2206        ssize_t rc = -EINVAL;
2207        int asize;
2208
2209        if (*ppos != 0)
2210                return 0;
2211
2212        if (smack_syslog_label == NULL)
2213                skp = &smack_known_star;
2214        else
2215                skp = smack_syslog_label;
2216
2217        asize = strlen(skp->smk_known) + 1;
2218
2219        if (cn >= asize)
2220                rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2221                                                asize);
2222
2223        return rc;
2224}
2225
2226/**
2227 * smk_write_syslog - write() for smackfs/syslog
2228 * @file: file pointer, not actually used
2229 * @buf: where to get the data from
2230 * @count: bytes sent
2231 * @ppos: where to start
2232 *
2233 * Returns number of bytes written or error code, as appropriate
2234 */
2235static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2236                                size_t count, loff_t *ppos)
2237{
2238        char *data;
2239        struct smack_known *skp;
2240        int rc = count;
2241
2242        if (!smack_privileged(CAP_MAC_ADMIN))
2243                return -EPERM;
2244
2245        data = kzalloc(count + 1, GFP_KERNEL);
2246        if (data == NULL)
2247                return -ENOMEM;
2248
2249        if (copy_from_user(data, buf, count) != 0)
2250                rc = -EFAULT;
2251        else {
2252                skp = smk_import_entry(data, count);
2253                if (skp == NULL)
2254                        rc = -EINVAL;
2255                else
2256                        smack_syslog_label = smk_import_entry(data, count);
2257        }
2258
2259        kfree(data);
2260        return rc;
2261}
2262
2263static const struct file_operations smk_syslog_ops = {
2264        .read           = smk_read_syslog,
2265        .write          = smk_write_syslog,
2266        .llseek         = default_llseek,
2267};
2268
2269
2270/**
2271 * smk_read_ptrace - read() for /smack/ptrace
2272 * @filp: file pointer, not actually used
2273 * @buf: where to put the result
2274 * @count: maximum to send along
2275 * @ppos: where to start
2276 *
2277 * Returns number of bytes read or error code, as appropriate
2278 */
2279static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2280                               size_t count, loff_t *ppos)
2281{
2282        char temp[32];
2283        ssize_t rc;
2284
2285        if (*ppos != 0)
2286                return 0;
2287
2288        sprintf(temp, "%d\n", smack_ptrace_rule);
2289        rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2290        return rc;
2291}
2292
2293/**
2294 * smk_write_ptrace - write() for /smack/ptrace
2295 * @file: file pointer
2296 * @buf: data from user space
2297 * @count: bytes sent
2298 * @ppos: where to start - must be 0
2299 */
2300static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2301                                size_t count, loff_t *ppos)
2302{
2303        char temp[32];
2304        int i;
2305
2306        if (!smack_privileged(CAP_MAC_ADMIN))
2307                return -EPERM;
2308
2309        if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2310                return -EINVAL;
2311
2312        if (copy_from_user(temp, buf, count) != 0)
2313                return -EFAULT;
2314
2315        temp[count] = '\0';
2316
2317        if (sscanf(temp, "%d", &i) != 1)
2318                return -EINVAL;
2319        if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2320                return -EINVAL;
2321        smack_ptrace_rule = i;
2322
2323        return count;
2324}
2325
2326static const struct file_operations smk_ptrace_ops = {
2327        .write          = smk_write_ptrace,
2328        .read           = smk_read_ptrace,
2329        .llseek         = default_llseek,
2330};
2331
2332/**
2333 * smk_fill_super - fill the smackfs superblock
2334 * @sb: the empty superblock
2335 * @data: unused
2336 * @silent: unused
2337 *
2338 * Fill in the well known entries for the smack filesystem
2339 *
2340 * Returns 0 on success, an error code on failure
2341 */
2342static int smk_fill_super(struct super_block *sb, void *data, int silent)
2343{
2344        int rc;
2345        struct inode *root_inode;
2346
2347        static struct tree_descr smack_files[] = {
2348                [SMK_LOAD] = {
2349                        "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2350                [SMK_CIPSO] = {
2351                        "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2352                [SMK_DOI] = {
2353                        "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2354                [SMK_DIRECT] = {
2355                        "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2356                [SMK_AMBIENT] = {
2357                        "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2358                [SMK_NETLBLADDR] = {
2359                        "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
2360                [SMK_ONLYCAP] = {
2361                        "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2362                [SMK_LOGGING] = {
2363                        "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2364                [SMK_LOAD_SELF] = {
2365                        "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2366                [SMK_ACCESSES] = {
2367                        "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2368                [SMK_MAPPED] = {
2369                        "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2370                [SMK_LOAD2] = {
2371                        "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2372                [SMK_LOAD_SELF2] = {
2373                        "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2374                [SMK_ACCESS2] = {
2375                        "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2376                [SMK_CIPSO2] = {
2377                        "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2378                [SMK_REVOKE_SUBJ] = {
2379                        "revoke-subject", &smk_revoke_subj_ops,
2380                        S_IRUGO|S_IWUSR},
2381                [SMK_CHANGE_RULE] = {
2382                        "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2383                [SMK_SYSLOG] = {
2384                        "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2385                [SMK_PTRACE] = {
2386                        "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2387                /* last one */
2388                        {""}
2389        };
2390
2391        rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2392        if (rc != 0) {
2393                printk(KERN_ERR "%s failed %d while creating inodes\n",
2394                        __func__, rc);
2395                return rc;
2396        }
2397
2398        root_inode = sb->s_root->d_inode;
2399
2400        return 0;
2401}
2402
2403/**
2404 * smk_mount - get the smackfs superblock
2405 * @fs_type: passed along without comment
2406 * @flags: passed along without comment
2407 * @dev_name: passed along without comment
2408 * @data: passed along without comment
2409 *
2410 * Just passes everything along.
2411 *
2412 * Returns what the lower level code does.
2413 */
2414static struct dentry *smk_mount(struct file_system_type *fs_type,
2415                      int flags, const char *dev_name, void *data)
2416{
2417        return mount_single(fs_type, flags, data, smk_fill_super);
2418}
2419
2420static struct file_system_type smk_fs_type = {
2421        .name           = "smackfs",
2422        .mount          = smk_mount,
2423        .kill_sb        = kill_litter_super,
2424};
2425
2426static struct vfsmount *smackfs_mount;
2427
2428static int __init smk_preset_netlabel(struct smack_known *skp)
2429{
2430        skp->smk_netlabel.domain = skp->smk_known;
2431        skp->smk_netlabel.flags =
2432                NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2433        return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2434                                &skp->smk_netlabel, strlen(skp->smk_known));
2435}
2436
2437/**
2438 * init_smk_fs - get the smackfs superblock
2439 *
2440 * register the smackfs
2441 *
2442 * Do not register smackfs if Smack wasn't enabled
2443 * on boot. We can not put this method normally under the
2444 * smack_init() code path since the security subsystem get
2445 * initialized before the vfs caches.
2446 *
2447 * Returns true if we were not chosen on boot or if
2448 * we were chosen and filesystem registration succeeded.
2449 */
2450static int __init init_smk_fs(void)
2451{
2452        int err;
2453        int rc;
2454
2455        if (!security_module_enable(&smack_ops))
2456                return 0;
2457
2458        err = smk_init_sysfs();
2459        if (err)
2460                printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2461
2462        err = register_filesystem(&smk_fs_type);
2463        if (!err) {
2464                smackfs_mount = kern_mount(&smk_fs_type);
2465                if (IS_ERR(smackfs_mount)) {
2466                        printk(KERN_ERR "smackfs:  could not mount!\n");
2467                        err = PTR_ERR(smackfs_mount);
2468                        smackfs_mount = NULL;
2469                }
2470        }
2471
2472        smk_cipso_doi();
2473        smk_unlbl_ambient(NULL);
2474
2475        rc = smk_preset_netlabel(&smack_known_floor);
2476        if (err == 0 && rc < 0)
2477                err = rc;
2478        rc = smk_preset_netlabel(&smack_known_hat);
2479        if (err == 0 && rc < 0)
2480                err = rc;
2481        rc = smk_preset_netlabel(&smack_known_huh);
2482        if (err == 0 && rc < 0)
2483                err = rc;
2484        rc = smk_preset_netlabel(&smack_known_invalid);
2485        if (err == 0 && rc < 0)
2486                err = rc;
2487        rc = smk_preset_netlabel(&smack_known_star);
2488        if (err == 0 && rc < 0)
2489                err = rc;
2490        rc = smk_preset_netlabel(&smack_known_web);
2491        if (err == 0 && rc < 0)
2492                err = rc;
2493
2494        return err;
2495}
2496
2497__initcall(init_smk_fs);
2498
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