security/selinux/ss/services.c

   1 /*
   2  * Implementation of the security services.
   3  *
   4  * Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  *           James Morris <jmorris@redhat.com>
   6  *
   7  *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License version 2,
  11  *      as published by the Free Software Foundation.
  12  *
  13  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  14  *
  15  *      Added conditional policy language extensions
  16  *
  17  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  18  *      This program is free software; you can redistribute it and/or modify
  19  *      it under the terms of the GNU General Public License as published by
  20  *      the Free Software Foundation, version 2.
  21  */
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24 #include <linux/string.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/errno.h>
  27 #include <linux/in.h>
  28 #include <linux/sched.h>
  29 #include <linux/audit.h>
  30 #include <asm/semaphore.h>
  31 #include "flask.h"
  32 #include "avc.h"
  33 #include "avc_ss.h"
  34 #include "security.h"
  35 #include "context.h"
  36 #include "policydb.h"
  37 #include "sidtab.h"
  38 #include "services.h"
  39 #include "conditional.h"
  40 #include "mls.h"
  41
  42 extern void selnl_notify_policyload(u32 seqno);
  43
  44 static rwlock_t policy_rwlock = RW_LOCK_UNLOCKED;
  45 #define POLICY_RDLOCK read_lock(&policy_rwlock)
  46 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
  47 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
  48 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
  49
  50 static DECLARE_MUTEX(load_sem);
  51 #define LOAD_LOCK down(&load_sem)
  52 #define LOAD_UNLOCK up(&load_sem)
  53
  54 struct sidtab sidtab;
  55 struct policydb policydb;
  56 int ss_initialized = 0;
  57
  58 /*
  59  * The largest sequence number that has been used when
  60  * providing an access decision to the access vector cache.
  61  * The sequence number only changes when a policy change
  62  * occurs.
  63  */
  64 static u32 latest_granting = 0;
  65
  66 /*
  67  * Return the boolean value of a constraint expression
  68  * when it is applied to the specified source and target
  69  * security contexts.
  70  */
  71 static int constraint_expr_eval(struct context *scontext,
  72                                 struct context *tcontext,
  73                                 struct constraint_expr *cexpr)
  74 {
  75         u32 val1, val2;
  76         struct context *c;
  77         struct role_datum *r1, *r2;
  78         struct constraint_expr *e;
  79         int s[CEXPR_MAXDEPTH];
  80         int sp = -1;
  81
  82         for (e = cexpr; e; e = e->next) {
  83                 switch (e->expr_type) {
  84                 case CEXPR_NOT:
  85                         BUG_ON(sp < 0);
  86                         s[sp] = !s[sp];
  87                         break;
  88                 case CEXPR_AND:
  89                         BUG_ON(sp < 1);
  90                         sp--;
  91                         s[sp] &= s[sp+1];
  92                         break;
  93                 case CEXPR_OR:
  94                         BUG_ON(sp < 1);
  95                         sp--;
  96                         s[sp] |= s[sp+1];
  97                         break;
  98                 case CEXPR_ATTR:
  99                         if (sp == (CEXPR_MAXDEPTH-1))
 100                                 return 0;
 101                         switch (e->attr) {
 102                         case CEXPR_USER:
 103                                 val1 = scontext->user;
 104                                 val2 = tcontext->user;
 105                                 break;
 106                         case CEXPR_TYPE:
 107                                 val1 = scontext->type;
 108                                 val2 = tcontext->type;
 109                                 break;
 110                         case CEXPR_ROLE:
 111                                 val1 = scontext->role;
 112                                 val2 = tcontext->role;
 113                                 r1 = policydb.role_val_to_struct[val1 - 1];
 114                                 r2 = policydb.role_val_to_struct[val2 - 1];
 115                                 switch (e->op) {
 116                                 case CEXPR_DOM:
 117                                         s[++sp] = ebitmap_get_bit(&r1->dominates,
 118                                                                   val2 - 1);
 119                                         continue;
 120                                 case CEXPR_DOMBY:
 121                                         s[++sp] = ebitmap_get_bit(&r2->dominates,
 122                                                                   val1 - 1);
 123                                         continue;
 124                                 case CEXPR_INCOMP:
 125                                         s[++sp] = ( !ebitmap_get_bit(&r1->dominates,
 126                                                                      val2 - 1) &&
 127                                                     !ebitmap_get_bit(&r2->dominates,
 128                                                                      val1 - 1) );
 129                                         continue;
 130                                 default:
 131                                         break;
 132                                 }
 133                                 break;
 134                         default:
 135                                 BUG();
 136                                 return 0;
 137                         }
 138
 139                         switch (e->op) {
 140                         case CEXPR_EQ:
 141                                 s[++sp] = (val1 == val2);
 142                                 break;
 143                         case CEXPR_NEQ:
 144                                 s[++sp] = (val1 != val2);
 145                                 break;
 146                         default:
 147                                 BUG();
 148                                 return 0;
 149                         }
 150                         break;
 151                 case CEXPR_NAMES:
 152                         if (sp == (CEXPR_MAXDEPTH-1))
 153                                 return 0;
 154                         c = scontext;
 155                         if (e->attr & CEXPR_TARGET)
 156                                 c = tcontext;
 157                         if (e->attr & CEXPR_USER)
 158                                 val1 = c->user;
 159                         else if (e->attr & CEXPR_ROLE)
 160                                 val1 = c->role;
 161                         else if (e->attr & CEXPR_TYPE)
 162                                 val1 = c->type;
 163                         else {
 164                                 BUG();
 165                                 return 0;
 166                         }
 167
 168                         switch (e->op) {
 169                         case CEXPR_EQ:
 170                                 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
 171                                 break;
 172                         case CEXPR_NEQ:
 173                                 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
 174                                 break;
 175                         default:
 176                                 BUG();
 177                                 return 0;
 178                         }
 179                         break;
 180                 default:
 181                         BUG();
 182                         return 0;
 183                 }
 184         }
 185
 186         BUG_ON(sp != 0);
 187         return s[0];
 188 }
 189
 190 /*
 191  * Compute access vectors based on a context structure pair for
 192  * the permissions in a particular class.
 193  */
 194 static int context_struct_compute_av(struct context *scontext,
 195                                      struct context *tcontext,
 196                                      u16 tclass,
 197                                      u32 requested,
 198                                      struct av_decision *avd)
 199 {
 200         struct constraint_node *constraint;
 201         struct role_allow *ra;
 202         struct avtab_key avkey;
 203         struct avtab_datum *avdatum;
 204         struct class_datum *tclass_datum;
 205
 206         if (!tclass || tclass > policydb.p_classes.nprim) {
 207                 printk(KERN_ERR "security_compute_av:  unrecognized class %d\n",
 208                        tclass);
 209                 return -EINVAL;
 210         }
 211         tclass_datum = policydb.class_val_to_struct[tclass - 1];
 212
 213         /*
 214          * Initialize the access vectors to the default values.
 215          */
 216         avd->allowed = 0;
 217         avd->decided = 0xffffffff;
 218         avd->auditallow = 0;
 219         avd->auditdeny = 0xffffffff;
 220         avd->seqno = latest_granting;
 221
 222         /*
 223          * If a specific type enforcement rule was defined for
 224          * this permission check, then use it.
 225          */
 226         avkey.source_type = scontext->type;
 227         avkey.target_type = tcontext->type;
 228         avkey.target_class = tclass;
 229         avdatum = avtab_search(&policydb.te_avtab, &avkey, AVTAB_AV);
 230         if (avdatum) {
 231                 if (avdatum->specified & AVTAB_ALLOWED)
 232                         avd->allowed = avtab_allowed(avdatum);
 233                 if (avdatum->specified & AVTAB_AUDITDENY)
 234                         avd->auditdeny = avtab_auditdeny(avdatum);
 235                 if (avdatum->specified & AVTAB_AUDITALLOW)
 236                         avd->auditallow = avtab_auditallow(avdatum);
 237         }
 238
 239         /* Check conditional av table for additional permissions */
 240         cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
 241
 242         /*
 243          * Remove any permissions prohibited by the MLS policy.
 244          */
 245         mls_compute_av(scontext, tcontext, tclass_datum, &avd->allowed);
 246
 247         /*
 248          * Remove any permissions prohibited by a constraint.
 249          */
 250         constraint = tclass_datum->constraints;
 251         while (constraint) {
 252                 if ((constraint->permissions & (avd->allowed)) &&
 253                     !constraint_expr_eval(scontext, tcontext,
 254                                           constraint->expr)) {
 255                         avd->allowed = (avd->allowed) & ~(constraint->permissions);
 256                 }
 257                 constraint = constraint->next;
 258         }
 259
 260         /*
 261          * If checking process transition permission and the
 262          * role is changing, then check the (current_role, new_role)
 263          * pair.
 264          */
 265         if (tclass == SECCLASS_PROCESS &&
 266             (avd->allowed & PROCESS__TRANSITION) &&
 267             scontext->role != tcontext->role) {
 268                 for (ra = policydb.role_allow; ra; ra = ra->next) {
 269                         if (scontext->role == ra->role &&
 270                             tcontext->role == ra->new_role)
 271                                 break;
 272                 }
 273                 if (!ra)
 274                         avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION);
 275         }
 276
 277         return 0;
 278 }
 279
 280 /**
 281  * security_compute_av - Compute access vector decisions.
 282  * @ssid: source security identifier
 283  * @tsid: target security identifier
 284  * @tclass: target security class
 285  * @requested: requested permissions
 286  * @avd: access vector decisions
 287  *
 288  * Compute a set of access vector decisions based on the
 289  * SID pair (@ssid, @tsid) for the permissions in @tclass.
 290  * Return -%EINVAL if any of the parameters are invalid or %0
 291  * if the access vector decisions were computed successfully.
 292  */
 293 int security_compute_av(u32 ssid,
 294                         u32 tsid,
 295                         u16 tclass,
 296                         u32 requested,
 297                         struct av_decision *avd)
 298 {
 299         struct context *scontext = 0, *tcontext = 0;
 300         int rc = 0;
 301
 302         if (!ss_initialized) {
 303                 avd->allowed = requested;
 304                 avd->decided = requested;
 305                 avd->auditallow = 0;
 306                 avd->auditdeny = 0xffffffff;
 307                 avd->seqno = latest_granting;
 308                 return 0;
 309         }
 310
 311         POLICY_RDLOCK;
 312
 313         scontext = sidtab_search(&sidtab, ssid);
 314         if (!scontext) {
 315                 printk(KERN_ERR "security_compute_av:  unrecognized SID %d\n",
 316                        ssid);
 317                 rc = -EINVAL;
 318                 goto out;
 319         }
 320         tcontext = sidtab_search(&sidtab, tsid);
 321         if (!tcontext) {
 322                 printk(KERN_ERR "security_compute_av:  unrecognized SID %d\n",
 323                        tsid);
 324                 rc = -EINVAL;
 325                 goto out;
 326         }
 327
 328         rc = context_struct_compute_av(scontext, tcontext, tclass,
 329                                        requested, avd);
 330 out:
 331         POLICY_RDUNLOCK;
 332         return rc;
 333 }
 334
 335 /*
 336  * Write the security context string representation of
 337  * the context structure `context' into a dynamically
 338  * allocated string of the correct size.  Set `*scontext'
 339  * to point to this string and set `*scontext_len' to
 340  * the length of the string.
 341  */
 342 int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
 343 {
 344         char *scontextp;
 345
 346         *scontext = 0;
 347         *scontext_len = 0;
 348
 349         /* Compute the size of the context. */
 350         *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1;
 351         *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1;
 352         *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
 353         *scontext_len += mls_compute_context_len(context);
 354
 355         /* Allocate space for the context; caller must free this space. */
 356         scontextp = kmalloc(*scontext_len+1,GFP_ATOMIC);
 357         if (!scontextp) {
 358                 return -ENOMEM;
 359         }
 360         *scontext = scontextp;
 361
 362         /*
 363          * Copy the user name, role name and type name into the context.
 364          */
 365         sprintf(scontextp, "%s:%s:%s:",
 366                 policydb.p_user_val_to_name[context->user - 1],
 367                 policydb.p_role_val_to_name[context->role - 1],
 368                 policydb.p_type_val_to_name[context->type - 1]);
 369         scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) +
 370                      1 + strlen(policydb.p_role_val_to_name[context->role - 1]) +
 371                      1 + strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
 372
 373         mls_sid_to_context(context, &scontextp);
 374
 375         scontextp--;
 376         *scontextp = 0;
 377
 378         return 0;
 379 }
 380
 381 #include "initial_sid_to_string.h"
 382
 383 /**
 384  * security_sid_to_context - Obtain a context for a given SID.
 385  * @sid: security identifier, SID
 386  * @scontext: security context
 387  * @scontext_len: length in bytes
 388  *
 389  * Write the string representation of the context associated with @sid
 390  * into a dynamically allocated string of the correct size.  Set @scontext
 391  * to point to this string and set @scontext_len to the length of the string.
 392  */
 393 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
 394 {
 395         struct context *context;
 396         int rc = 0;
 397
 398         if (!ss_initialized) {
 399                 if (sid <= SECINITSID_NUM) {
 400                         char *scontextp;
 401
 402                         *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
 403                         scontextp = kmalloc(*scontext_len,GFP_ATOMIC);
 404                         strcpy(scontextp, initial_sid_to_string[sid]);
 405                         *scontext = scontextp;
 406                         goto out;
 407                 }
 408                 printk(KERN_ERR "security_sid_to_context:  called before initial "
 409                        "load_policy on unknown SID %d\n", sid);
 410                 rc = -EINVAL;
 411                 goto out;
 412         }
 413         POLICY_RDLOCK;
 414         context = sidtab_search(&sidtab, sid);
 415         if (!context) {
 416                 printk(KERN_ERR "security_sid_to_context:  unrecognized SID "
 417                        "%d\n", sid);
 418                 rc = -EINVAL;
 419                 goto out_unlock;
 420         }
 421         rc = context_struct_to_string(context, scontext, scontext_len);
 422 out_unlock:
 423         POLICY_RDUNLOCK;
 424 out:
 425         return rc;
 426
 427 }
 428
 429 /**
 430  * security_context_to_sid - Obtain a SID for a given security context.
 431  * @scontext: security context
 432  * @scontext_len: length in bytes
 433  * @sid: security identifier, SID
 434  *
 435  * Obtains a SID associated with the security context that
 436  * has the string representation specified by @scontext.
 437  * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
 438  * memory is available, or 0 on success.
 439  */
 440 int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
 441 {
 442         char *scontext2;
 443         struct context context;
 444         struct role_datum *role;
 445         struct type_datum *typdatum;
 446         struct user_datum *usrdatum;
 447         char *scontextp, *p, oldc;
 448         int rc = 0;
 449
 450         if (!ss_initialized) {
 451                 int i;
 452
 453                 for (i = 1; i < SECINITSID_NUM; i++) {
 454                         if (!strcmp(initial_sid_to_string[i], scontext)) {
 455                                 *sid = i;
 456                                 goto out;
 457                         }
 458                 }
 459                 *sid = SECINITSID_KERNEL;
 460                 goto out;
 461         }
 462         *sid = SECSID_NULL;
 463
 464         /* Copy the string so that we can modify the copy as we parse it.
 465            The string should already by null terminated, but we append a
 466            null suffix to the copy to avoid problems with the existing
 467            attr package, which doesn't view the null terminator as part
 468            of the attribute value. */
 469         scontext2 = kmalloc(scontext_len+1,GFP_KERNEL);
 470         if (!scontext2) {
 471                 rc = -ENOMEM;
 472                 goto out;
 473         }
 474         memcpy(scontext2, scontext, scontext_len);
 475         scontext2[scontext_len] = 0;
 476
 477         context_init(&context);
 478         *sid = SECSID_NULL;
 479
 480         POLICY_RDLOCK;
 481
 482         /* Parse the security context. */
 483
 484         rc = -EINVAL;
 485         scontextp = (char *) scontext2;
 486
 487         /* Extract the user. */
 488         p = scontextp;
 489         while (*p && *p != ':')
 490                 p++;
 491
 492         if (*p == 0)
 493                 goto out_unlock;
 494
 495         *p++ = 0;
 496
 497         usrdatum = hashtab_search(policydb.p_users.table, scontextp);
 498         if (!usrdatum)
 499                 goto out_unlock;
 500
 501         context.user = usrdatum->value;
 502
 503         /* Extract role. */
 504         scontextp = p;
 505         while (*p && *p != ':')
 506                 p++;
 507
 508         if (*p == 0)
 509                 goto out_unlock;
 510
 511         *p++ = 0;
 512
 513         role = hashtab_search(policydb.p_roles.table, scontextp);
 514         if (!role)
 515                 goto out_unlock;
 516         context.role = role->value;
 517
 518         /* Extract type. */
 519         scontextp = p;
 520         while (*p && *p != ':')
 521                 p++;
 522         oldc = *p;
 523         *p++ = 0;
 524
 525         typdatum = hashtab_search(policydb.p_types.table, scontextp);
 526         if (!typdatum)
 527                 goto out_unlock;
 528
 529         context.type = typdatum->value;
 530
 531         rc = mls_context_to_sid(oldc, &p, &context);
 532         if (rc)
 533                 goto out_unlock;
 534
 535         if ((p - scontext2) < scontext_len) {
 536                 rc = -EINVAL;
 537                 goto out_unlock;
 538         }
 539
 540         /* Check the validity of the new context. */
 541         if (!policydb_context_isvalid(&policydb, &context)) {
 542                 rc = -EINVAL;
 543                 goto out_unlock;
 544         }
 545         /* Obtain the new sid. */
 546         rc = sidtab_context_to_sid(&sidtab, &context, sid);
 547 out_unlock:
 548         POLICY_RDUNLOCK;
 549         context_destroy(&context);
 550         kfree(scontext2);
 551 out:
 552         return rc;
 553 }
 554
 555 static int compute_sid_handle_invalid_context(
 556         struct context *scontext,
 557         struct context *tcontext,
 558         u16 tclass,
 559         struct context *newcontext)
 560 {
 561         char *s = NULL, *t = NULL, *n = NULL;
 562         u32 slen, tlen, nlen;
 563
 564         if (context_struct_to_string(scontext, &s, &slen) < 0)
 565                 goto out;
 566         if (context_struct_to_string(tcontext, &t, &tlen) < 0)
 567                 goto out;
 568         if (context_struct_to_string(newcontext, &n, &nlen) < 0)
 569                 goto out;
 570         audit_log(current->audit_context,
 571                   "security_compute_sid:  invalid context %s"
 572                   " for scontext=%s"
 573                   " tcontext=%s"
 574                   " tclass=%s",
 575                   n, s, t, policydb.p_class_val_to_name[tclass-1]);
 576 out:
 577         kfree(s);
 578         kfree(t);
 579         kfree(n);
 580         if (!selinux_enforcing)
 581                 return 0;
 582         return -EACCES;
 583 }
 584
 585 static int security_compute_sid(u32 ssid,
 586                                 u32 tsid,
 587                                 u16 tclass,
 588                                 u32 specified,
 589                                 u32 *out_sid)
 590 {
 591         struct context *scontext = 0, *tcontext = 0, newcontext;
 592         struct role_trans *roletr = 0;
 593         struct avtab_key avkey;
 594         struct avtab_datum *avdatum;
 595         struct avtab_node *node;
 596         unsigned int type_change = 0;
 597         int rc = 0;
 598
 599         if (!ss_initialized) {
 600                 switch (tclass) {
 601                 case SECCLASS_PROCESS:
 602                         *out_sid = ssid;
 603                         break;
 604                 default:
 605                         *out_sid = tsid;
 606                         break;
 607                 }
 608                 goto out;
 609         }
 610
 611         POLICY_RDLOCK;
 612
 613         scontext = sidtab_search(&sidtab, ssid);
 614         if (!scontext) {
 615                 printk(KERN_ERR "security_compute_sid:  unrecognized SID %d\n",
 616                        ssid);
 617                 rc = -EINVAL;
 618                 goto out_unlock;
 619         }
 620         tcontext = sidtab_search(&sidtab, tsid);
 621         if (!tcontext) {
 622                 printk(KERN_ERR "security_compute_sid:  unrecognized SID %d\n",
 623                        tsid);
 624                 rc = -EINVAL;
 625                 goto out_unlock;
 626         }
 627
 628         context_init(&newcontext);
 629
 630         /* Set the user identity. */
 631         switch (specified) {
 632         case AVTAB_TRANSITION:
 633         case AVTAB_CHANGE:
 634                 /* Use the process user identity. */
 635                 newcontext.user = scontext->user;
 636                 break;
 637         case AVTAB_MEMBER:
 638                 /* Use the related object owner. */
 639                 newcontext.user = tcontext->user;
 640                 break;
 641         }
 642
 643         /* Set the role and type to default values. */
 644         switch (tclass) {
 645         case SECCLASS_PROCESS:
 646                 /* Use the current role and type of process. */
 647                 newcontext.role = scontext->role;
 648                 newcontext.type = scontext->type;
 649                 break;
 650         default:
 651                 /* Use the well-defined object role. */
 652                 newcontext.role = OBJECT_R_VAL;
 653                 /* Use the type of the related object. */
 654                 newcontext.type = tcontext->type;
 655         }
 656
 657         /* Look for a type transition/member/change rule. */
 658         avkey.source_type = scontext->type;
 659         avkey.target_type = tcontext->type;
 660         avkey.target_class = tclass;
 661         avdatum = avtab_search(&policydb.te_avtab, &avkey, AVTAB_TYPE);
 662
 663         /* If no permanent rule, also check for enabled conditional rules */
 664         if(!avdatum) {
 665                 node = avtab_search_node(&policydb.te_cond_avtab, &avkey, specified);
 666                 for (; node != NULL; node = avtab_search_node_next(node, specified)) {
 667                         if (node->datum.specified & AVTAB_ENABLED) {
 668                                 avdatum = &node->datum;
 669                                 break;
 670                         }
 671                 }
 672         }
 673
 674         type_change = (avdatum && (avdatum->specified & specified));
 675         if (type_change) {
 676                 /* Use the type from the type transition/member/change rule. */
 677                 switch (specified) {
 678                 case AVTAB_TRANSITION:
 679                         newcontext.type = avtab_transition(avdatum);
 680                         break;
 681                 case AVTAB_MEMBER:
 682                         newcontext.type = avtab_member(avdatum);
 683                         break;
 684                 case AVTAB_CHANGE:
 685                         newcontext.type = avtab_change(avdatum);
 686                         break;
 687                 }
 688         }
 689
 690         /* Check for class-specific changes. */
 691         switch (tclass) {
 692         case SECCLASS_PROCESS:
 693                 if (specified & AVTAB_TRANSITION) {
 694                         /* Look for a role transition rule. */
 695                         for (roletr = policydb.role_tr; roletr;
 696                              roletr = roletr->next) {
 697                                 if (roletr->role == scontext->role &&
 698                                     roletr->type == tcontext->type) {
 699                                         /* Use the role transition rule. */
 700                                         newcontext.role = roletr->new_role;
 701                                         break;
 702                                 }
 703                         }
 704                 }
 705
 706                 if (!type_change && !roletr) {
 707                         /* No change in process role or type. */
 708                         *out_sid = ssid;
 709                         goto out_unlock;
 710
 711                 }
 712                 break;
 713         default:
 714                 if (!type_change &&
 715                     (newcontext.user == tcontext->user) &&
 716                     mls_context_cmp(scontext, tcontext)) {
 717                         /* No change in object type, owner,
 718                            or MLS attributes. */
 719                         *out_sid = tsid;
 720                         goto out_unlock;
 721                 }
 722                 break;
 723         }
 724
 725         /* Set the MLS attributes.
 726            This is done last because it may allocate memory. */
 727         rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext);
 728         if (rc)
 729                 goto out_unlock;
 730
 731         /* Check the validity of the context. */
 732         if (!policydb_context_isvalid(&policydb, &newcontext)) {
 733                 rc = compute_sid_handle_invalid_context(scontext,
 734                                                         tcontext,
 735                                                         tclass,
 736                                                         &newcontext);
 737                 if (rc)
 738                         goto out_unlock;
 739         }
 740         /* Obtain the sid for the context. */
 741         rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
 742 out_unlock:
 743         POLICY_RDUNLOCK;
 744         context_destroy(&newcontext);
 745 out:
 746         return rc;
 747 }
 748
 749 /**
 750  * security_transition_sid - Compute the SID for a new subject/object.
 751  * @ssid: source security identifier
 752  * @tsid: target security identifier
 753  * @tclass: target security class
 754  * @out_sid: security identifier for new subject/object
 755  *
 756  * Compute a SID to use for labeling a new subject or object in the
 757  * class @tclass based on a SID pair (@ssid, @tsid).
 758  * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
 759  * if insufficient memory is available, or %0 if the new SID was
 760  * computed successfully.
 761  */
 762 int security_transition_sid(u32 ssid,
 763                             u32 tsid,
 764                             u16 tclass,
 765                             u32 *out_sid)
 766 {
 767         return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid);
 768 }
 769
 770 /**
 771  * security_member_sid - Compute the SID for member selection.
 772  * @ssid: source security identifier
 773  * @tsid: target security identifier
 774  * @tclass: target security class
 775  * @out_sid: security identifier for selected member
 776  *
 777  * Compute a SID to use when selecting a member of a polyinstantiated
 778  * object of class @tclass based on a SID pair (@ssid, @tsid).
 779  * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
 780  * if insufficient memory is available, or %0 if the SID was
 781  * computed successfully.
 782  */
 783 int security_member_sid(u32 ssid,
 784                         u32 tsid,
 785                         u16 tclass,
 786                         u32 *out_sid)
 787 {
 788         return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid);
 789 }
 790
 791 /**
 792  * security_change_sid - Compute the SID for object relabeling.
 793  * @ssid: source security identifier
 794  * @tsid: target security identifier
 795  * @tclass: target security class
 796  * @out_sid: security identifier for selected member
 797  *
 798  * Compute a SID to use for relabeling an object of class @tclass
 799  * based on a SID pair (@ssid, @tsid).
 800  * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
 801  * if insufficient memory is available, or %0 if the SID was
 802  * computed successfully.
 803  */
 804 int security_change_sid(u32 ssid,
 805                         u32 tsid,
 806                         u16 tclass,
 807                         u32 *out_sid)
 808 {
 809         return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid);
 810 }
 811
 812 /*
 813  * Verify that each permission that is defined under the
 814  * existing policy is still defined with the same value
 815  * in the new policy.
 816  */
 817 static int validate_perm(void *key, void *datum, void *p)
 818 {
 819         struct hashtab *h;
 820         struct perm_datum *perdatum, *perdatum2;
 821         int rc = 0;
 822
 823
 824         h = p;
 825         perdatum = datum;
 826
 827         perdatum2 = hashtab_search(h, key);
 828         if (!perdatum2) {
 829                 printk(KERN_ERR "security:  permission %s disappeared",
 830                        (char *)key);
 831                 rc = -ENOENT;
 832                 goto out;
 833         }
 834         if (perdatum->value != perdatum2->value) {
 835                 printk(KERN_ERR "security:  the value of permission %s changed",
 836                        (char *)key);
 837                 rc = -EINVAL;
 838         }
 839 out:
 840         return rc;
 841 }
 842
 843 /*
 844  * Verify that each class that is defined under the
 845  * existing policy is still defined with the same
 846  * attributes in the new policy.
 847  */
 848 static int validate_class(void *key, void *datum, void *p)
 849 {
 850         struct policydb *newp;
 851         struct class_datum *cladatum, *cladatum2;
 852         int rc;
 853
 854         newp = p;
 855         cladatum = datum;
 856
 857         cladatum2 = hashtab_search(newp->p_classes.table, key);
 858         if (!cladatum2) {
 859                 printk(KERN_ERR "security:  class %s disappeared\n",
 860                        (char *)key);
 861                 rc = -ENOENT;
 862                 goto out;
 863         }
 864         if (cladatum->value != cladatum2->value) {
 865                 printk(KERN_ERR "security:  the value of class %s changed\n",
 866                        (char *)key);
 867                 rc = -EINVAL;
 868                 goto out;
 869         }
 870         if ((cladatum->comdatum && !cladatum2->comdatum) ||
 871             (!cladatum->comdatum && cladatum2->comdatum)) {
 872                 printk(KERN_ERR "security:  the inherits clause for the access "
 873                        "vector definition for class %s changed\n", (char *)key);
 874                 rc = -EINVAL;
 875                 goto out;
 876         }
 877         if (cladatum->comdatum) {
 878                 rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm,
 879                                  cladatum2->comdatum->permissions.table);
 880                 if (rc) {
 881                         printk(" in the access vector definition for class "
 882                                "%s\n", (char *)key);
 883                         goto out;
 884                 }
 885         }
 886         rc = hashtab_map(cladatum->permissions.table, validate_perm,
 887                          cladatum2->permissions.table);
 888         if (rc)
 889                 printk(" in access vector definition for class %s\n",
 890                        (char *)key);
 891 out:
 892         return rc;
 893 }
 894
 895 /* Clone the SID into the new SID table. */
 896 static int clone_sid(u32 sid,
 897                      struct context *context,
 898                      void *arg)
 899 {
 900         struct sidtab *s = arg;
 901
 902         return sidtab_insert(s, sid, context);
 903 }
 904
 905 static inline int convert_context_handle_invalid_context(struct context *context)
 906 {
 907         int rc = 0;
 908
 909         if (selinux_enforcing) {
 910                 rc = -EINVAL;
 911         } else {
 912                 char *s;
 913                 u32 len;
 914
 915                 context_struct_to_string(context, &s, &len);
 916                 printk(KERN_ERR "security:  context %s is invalid\n", s);
 917                 kfree(s);
 918         }
 919         return rc;
 920 }
 921
 922 struct convert_context_args {
 923         struct policydb *oldp;
 924         struct policydb *newp;
 925 };
 926
 927 /*
 928  * Convert the values in the security context
 929  * structure `c' from the values specified
 930  * in the policy `p->oldp' to the values specified
 931  * in the policy `p->newp'.  Verify that the
 932  * context is valid under the new policy.
 933  */
 934 static int convert_context(u32 key,
 935                            struct context *c,
 936                            void *p)
 937 {
 938         struct convert_context_args *args;
 939         struct context oldc;
 940         struct role_datum *role;
 941         struct type_datum *typdatum;
 942         struct user_datum *usrdatum;
 943         char *s;
 944         u32 len;
 945         int rc;
 946
 947         args = p;
 948
 949         rc = context_cpy(&oldc, c);
 950         if (rc)
 951                 goto out;
 952
 953         rc = -EINVAL;
 954
 955         /* Convert the user. */
 956         usrdatum = hashtab_search(args->newp->p_users.table,
 957                                   args->oldp->p_user_val_to_name[c->user - 1]);
 958         if (!usrdatum) {
 959                 goto bad;
 960         }
 961         c->user = usrdatum->value;
 962
 963         /* Convert the role. */
 964         role = hashtab_search(args->newp->p_roles.table,
 965                               args->oldp->p_role_val_to_name[c->role - 1]);
 966         if (!role) {
 967                 goto bad;
 968         }
 969         c->role = role->value;
 970
 971         /* Convert the type. */
 972         typdatum = hashtab_search(args->newp->p_types.table,
 973                                   args->oldp->p_type_val_to_name[c->type - 1]);
 974         if (!typdatum) {
 975                 goto bad;
 976         }
 977         c->type = typdatum->value;
 978
 979         rc = mls_convert_context(args->oldp, args->newp, c);
 980         if (rc)
 981                 goto bad;
 982
 983         /* Check the validity of the new context. */
 984         if (!policydb_context_isvalid(args->newp, c)) {
 985                 rc = convert_context_handle_invalid_context(&oldc);
 986                 if (rc)
 987                         goto bad;
 988         }
 989
 990         context_destroy(&oldc);
 991 out:
 992         return rc;
 993 bad:
 994         context_struct_to_string(&oldc, &s, &len);
 995         context_destroy(&oldc);
 996         printk(KERN_ERR "security:  invalidating context %s\n", s);
 997         kfree(s);
 998         goto out;
 999 }
1000
1001 extern void selinux_complete_init(void);
1002
1003 /**
1004  * security_load_policy - Load a security policy configuration.
1005  * @data: binary policy data
1006  * @len: length of data in bytes
1007  *
1008  * Load a new set of security policy configuration data,
1009  * validate it and convert the SID table as necessary.
1010  * This function will flush the access vector cache after
1011  * loading the new policy.
1012  */
1013 int security_load_policy(void *data, size_t len)
1014 {
1015         struct policydb oldpolicydb, newpolicydb;
1016         struct sidtab oldsidtab, newsidtab;
1017         struct convert_context_args args;
1018         u32 seqno;
1019         int rc = 0;
1020         struct policy_file file = { data, len }, *fp = &file;
1021
1022         LOAD_LOCK;
1023
1024         if (!ss_initialized) {
1025                 if (policydb_read(&policydb, fp)) {
1026                         LOAD_UNLOCK;
1027                         return -EINVAL;
1028                 }
1029                 if (policydb_load_isids(&policydb, &sidtab)) {
1030                         LOAD_UNLOCK;
1031                         policydb_destroy(&policydb);
1032                         return -EINVAL;
1033                 }
1034                 ss_initialized = 1;
1035
1036                 LOAD_UNLOCK;
1037                 selinux_complete_init();
1038                 return 0;
1039         }
1040
1041 #if 0
1042         sidtab_hash_eval(&sidtab, "sids");
1043 #endif
1044
1045         if (policydb_read(&newpolicydb, fp)) {
1046                 LOAD_UNLOCK;
1047                 return -EINVAL;
1048         }
1049
1050         sidtab_init(&newsidtab);
1051
1052         /* Verify that the existing classes did not change. */
1053         if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) {
1054                 printk(KERN_ERR "security:  the definition of an existing "
1055                        "class changed\n");
1056                 rc = -EINVAL;
1057                 goto err;
1058         }
1059
1060         /* Clone the SID table. */
1061         sidtab_shutdown(&sidtab);
1062         if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
1063                 rc = -ENOMEM;
1064                 goto err;
1065         }
1066
1067         /* Convert the internal representations of contexts
1068            in the new SID table and remove invalid SIDs. */
1069         args.oldp = &policydb;
1070         args.newp = &newpolicydb;
1071         sidtab_map_remove_on_error(&newsidtab, convert_context, &args);
1072
1073         /* Save the old policydb and SID table to free later. */
1074         memcpy(&oldpolicydb, &policydb, sizeof policydb);
1075         sidtab_set(&oldsidtab, &sidtab);
1076
1077         /* Install the new policydb and SID table. */
1078         POLICY_WRLOCK;
1079         memcpy(&policydb, &newpolicydb, sizeof policydb);
1080         sidtab_set(&sidtab, &newsidtab);
1081         seqno = ++latest_granting;
1082
1083         POLICY_WRUNLOCK;
1084         LOAD_UNLOCK;
1085
1086         /* Free the old policydb and SID table. */
1087         policydb_destroy(&oldpolicydb);
1088         sidtab_destroy(&oldsidtab);
1089
1090         avc_ss_reset(seqno);
1091         selnl_notify_policyload(seqno);
1092
1093         return 0;
1094
1095 err:
1096         LOAD_UNLOCK;
1097         sidtab_destroy(&newsidtab);
1098         policydb_destroy(&newpolicydb);
1099         return rc;
1100
1101 }
1102
1103 /**
1104  * security_port_sid - Obtain the SID for a port.
1105  * @domain: communication domain aka address family
1106  * @type: socket type
1107  * @protocol: protocol number
1108  * @port: port number
1109  * @out_sid: security identifier
1110  */
1111 int security_port_sid(u16 domain,
1112                       u16 type,
1113                       u8 protocol,
1114                       u16 port,
1115                       u32 *out_sid)
1116 {
1117         struct ocontext *c;
1118         int rc = 0;
1119
1120         POLICY_RDLOCK;
1121
1122         c = policydb.ocontexts[OCON_PORT];
1123         while (c) {
1124                 if (c->u.port.protocol == protocol &&
1125                     c->u.port.low_port <= port &&
1126                     c->u.port.high_port >= port)
1127                         break;
1128                 c = c->next;
1129         }
1130
1131         if (c) {
1132                 if (!c->sid[0]) {
1133                         rc = sidtab_context_to_sid(&sidtab,
1134                                                    &c->context[0],
1135                                                    &c->sid[0]);
1136                         if (rc)
1137                                 goto out;
1138                 }
1139                 *out_sid = c->sid[0];
1140         } else {
1141                 *out_sid = SECINITSID_PORT;
1142         }
1143
1144 out:
1145         POLICY_RDUNLOCK;
1146         return rc;
1147 }
1148
1149 /**
1150  * security_netif_sid - Obtain the SID for a network interface.
1151  * @name: interface name
1152  * @if_sid: interface SID
1153  * @msg_sid: default SID for received packets
1154  */
1155 int security_netif_sid(char *name,
1156                        u32 *if_sid,
1157                        u32 *msg_sid)
1158 {
1159         int rc = 0;
1160         struct ocontext *c;
1161
1162         POLICY_RDLOCK;
1163
1164         c = policydb.ocontexts[OCON_NETIF];
1165         while (c) {
1166                 if (strcmp(name, c->u.name) == 0)
1167                         break;
1168                 c = c->next;
1169         }
1170
1171         if (c) {
1172                 if (!c->sid[0] || !c->sid[1]) {
1173                         rc = sidtab_context_to_sid(&sidtab,
1174                                                   &c->context[0],
1175                                                   &c->sid[0]);
1176                         if (rc)
1177                                 goto out;
1178                         rc = sidtab_context_to_sid(&sidtab,
1179                                                    &c->context[1],
1180                                                    &c->sid[1]);
1181                         if (rc)
1182                                 goto out;
1183                 }
1184                 *if_sid = c->sid[0];
1185                 *msg_sid = c->sid[1];
1186         } else {
1187                 *if_sid = SECINITSID_NETIF;
1188                 *msg_sid = SECINITSID_NETMSG;
1189         }
1190
1191 out:
1192         POLICY_RDUNLOCK;
1193         return rc;
1194 }
1195
1196 static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
1197 {
1198         int i, fail = 0;
1199
1200         for(i = 0; i < 4; i++)
1201                 if(addr[i] != (input[i] & mask[i])) {
1202                         fail = 1;
1203                         break;
1204                 }
1205
1206         return !fail;
1207 }
1208
1209 /**
1210  * security_node_sid - Obtain the SID for a node (host).
1211  * @domain: communication domain aka address family
1212  * @addrp: address
1213  * @addrlen: address length in bytes
1214  * @out_sid: security identifier
1215  */
1216 int security_node_sid(u16 domain,
1217                       void *addrp,
1218                       u32 addrlen,
1219                       u32 *out_sid)
1220 {
1221         int rc = 0;
1222         struct ocontext *c;
1223
1224         POLICY_RDLOCK;
1225
1226         switch (domain) {
1227         case AF_INET: {
1228                 u32 addr;
1229
1230                 if (addrlen != sizeof(u32)) {
1231                         rc = -EINVAL;
1232                         goto out;
1233                 }
1234
1235                 addr = *((u32 *)addrp);
1236
1237                 c = policydb.ocontexts[OCON_NODE];
1238                 while (c) {
1239                         if (c->u.node.addr == (addr & c->u.node.mask))
1240                                 break;
1241                         c = c->next;
1242                 }
1243                 break;
1244         }
1245
1246         case AF_INET6:
1247                 if (addrlen != sizeof(u64) * 2) {
1248                         rc = -EINVAL;
1249                         goto out;
1250                 }
1251                 c = policydb.ocontexts[OCON_NODE6];
1252                 while (c) {
1253                         if (match_ipv6_addrmask(addrp, c->u.node6.addr,
1254                                                 c->u.node6.mask))
1255                                 break;
1256                         c = c->next;
1257                 }
1258                 break;
1259
1260         default:
1261                 *out_sid = SECINITSID_NODE;
1262                 goto out;
1263         }
1264
1265         if (c) {
1266                 if (!c->sid[0]) {
1267                         rc = sidtab_context_to_sid(&sidtab,
1268                                                    &c->context[0],
1269                                                    &c->sid[0]);
1270                         if (rc)
1271                                 goto out;
1272                 }
1273                 *out_sid = c->sid[0];
1274         } else {
1275                 *out_sid = SECINITSID_NODE;
1276         }
1277
1278 out:
1279         POLICY_RDUNLOCK;
1280         return rc;
1281 }
1282
1283 #define SIDS_NEL 25
1284
1285 /**
1286  * security_get_user_sids - Obtain reachable SIDs for a user.
1287  * @fromsid: starting SID
1288  * @username: username
1289  * @sids: array of reachable SIDs for user
1290  * @nel: number of elements in @sids
1291  *
1292  * Generate the set of SIDs for legal security contexts
1293  * for a given user that can be reached by @fromsid.
1294  * Set *@sids to point to a dynamically allocated
1295  * array containing the set of SIDs.  Set *@nel to the
1296  * number of elements in the array.
1297  */
1298
1299 int security_get_user_sids(u32 fromsid,
1300                            char *username,
1301                            u32 **sids,
1302                            u32 *nel)
1303 {
1304         struct context *fromcon, usercon;
1305         u32 *mysids, *mysids2, sid;
1306         u32 mynel = 0, maxnel = SIDS_NEL;
1307         struct user_datum *user;
1308         struct role_datum *role;
1309         struct av_decision avd;
1310         int rc = 0, i, j;
1311
1312         if (!ss_initialized) {
1313                 *sids = NULL;
1314                 *nel = 0;
1315                 goto out;
1316         }
1317
1318         POLICY_RDLOCK;
1319
1320         fromcon = sidtab_search(&sidtab, fromsid);
1321         if (!fromcon) {
1322                 rc = -EINVAL;
1323                 goto out_unlock;
1324         }
1325
1326         user = hashtab_search(policydb.p_users.table, username);
1327         if (!user) {
1328                 rc = -EINVAL;
1329                 goto out_unlock;
1330         }
1331         usercon.user = user->value;
1332
1333         mysids = kmalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
1334         if (!mysids) {
1335                 rc = -ENOMEM;
1336                 goto out_unlock;
1337         }
1338         memset(mysids, 0, maxnel*sizeof(*mysids));
1339
1340         for (i = ebitmap_startbit(&user->roles); i < ebitmap_length(&user->roles); i++) {
1341                 if (!ebitmap_get_bit(&user->roles, i))
1342                         continue;
1343                 role = policydb.role_val_to_struct[i];
1344                 usercon.role = i+1;
1345                 for (j = ebitmap_startbit(&role->types); j < ebitmap_length(&role->types); j++) {
1346                         if (!ebitmap_get_bit(&role->types, j))
1347                                 continue;
1348                         usercon.type = j+1;
1349                         mls_for_user_ranges(user,usercon) {
1350                                 rc = context_struct_compute_av(fromcon, &usercon,
1351                                                                SECCLASS_PROCESS,
1352                                                                PROCESS__TRANSITION,
1353                                                                &avd);
1354                                 if (rc ||  !(avd.allowed & PROCESS__TRANSITION))
1355                                         continue;
1356                                 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
1357                                 if (rc) {
1358                                         kfree(mysids);
1359                                         goto out_unlock;
1360                                 }
1361                                 if (mynel < maxnel) {
1362                                         mysids[mynel++] = sid;
1363                                 } else {
1364                                         maxnel += SIDS_NEL;
1365                                         mysids2 = kmalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
1366                                         if (!mysids2) {
1367                                                 rc = -ENOMEM;
1368                                                 kfree(mysids);
1369                                                 goto out_unlock;
1370                                         }
1371                                         memset(mysids2, 0, maxnel*sizeof(*mysids2));
1372                                         memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
1373                                         kfree(mysids);
1374                                         mysids = mysids2;
1375                                         mysids[mynel++] = sid;
1376                                 }
1377                         }
1378                         mls_end_user_ranges;
1379                 }
1380         }
1381
1382         *sids = mysids;
1383         *nel = mynel;
1384
1385 out_unlock:
1386         POLICY_RDUNLOCK;
1387 out:
1388         return rc;
1389 }
1390
1391 /**
1392  * security_genfs_sid - Obtain a SID for a file in a filesystem
1393  * @fstype: filesystem type
1394  * @path: path from root of mount
1395  * @sclass: file security class
1396  * @sid: SID for path
1397  *
1398  * Obtain a SID to use for a file in a filesystem that
1399  * cannot support xattr or use a fixed labeling behavior like
1400  * transition SIDs or task SIDs.
1401  */
1402 int security_genfs_sid(const char *fstype,
1403                        char *path,
1404                        u16 sclass,
1405                        u32 *sid)
1406 {
1407         int len;
1408         struct genfs *genfs;
1409         struct ocontext *c;
1410         int rc = 0, cmp = 0;
1411
1412         POLICY_RDLOCK;
1413
1414         for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
1415                 cmp = strcmp(fstype, genfs->fstype);
1416                 if (cmp <= 0)
1417                         break;
1418         }
1419
1420         if (!genfs || cmp) {
1421                 *sid = SECINITSID_UNLABELED;
1422                 rc = -ENOENT;
1423                 goto out;
1424         }
1425
1426         for (c = genfs->head; c; c = c->next) {
1427                 len = strlen(c->u.name);
1428                 if ((!c->v.sclass || sclass == c->v.sclass) &&
1429                     (strncmp(c->u.name, path, len) == 0))
1430                         break;
1431         }
1432
1433         if (!c) {
1434                 *sid = SECINITSID_UNLABELED;
1435                 rc = -ENOENT;
1436                 goto out;
1437         }
1438
1439         if (!c->sid[0]) {
1440                 rc = sidtab_context_to_sid(&sidtab,
1441                                            &c->context[0],
1442                                            &c->sid[0]);
1443                 if (rc)
1444                         goto out;
1445         }
1446
1447         *sid = c->sid[0];
1448 out:
1449         POLICY_RDUNLOCK;
1450         return rc;
1451 }
1452
1453 /**
1454  * security_fs_use - Determine how to handle labeling for a filesystem.
1455  * @fstype: filesystem type
1456  * @behavior: labeling behavior
1457  * @sid: SID for filesystem (superblock)
1458  */
1459 int security_fs_use(
1460         const char *fstype,
1461         unsigned int *behavior,
1462         u32 *sid)
1463 {
1464         int rc = 0;
1465         struct ocontext *c;
1466
1467         POLICY_RDLOCK;
1468
1469         c = policydb.ocontexts[OCON_FSUSE];
1470         while (c) {
1471                 if (strcmp(fstype, c->u.name) == 0)
1472                         break;
1473                 c = c->next;
1474         }
1475
1476         if (c) {
1477                 *behavior = c->v.behavior;
1478                 if (!c->sid[0]) {
1479                         rc = sidtab_context_to_sid(&sidtab,
1480                                                    &c->context[0],
1481                                                    &c->sid[0]);
1482                         if (rc)
1483                                 goto out;
1484                 }
1485                 *sid = c->sid[0];
1486         } else {
1487                 rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
1488                 if (rc) {
1489                         *behavior = SECURITY_FS_USE_NONE;
1490                         rc = 0;
1491                 } else {
1492                         *behavior = SECURITY_FS_USE_GENFS;
1493                 }
1494         }
1495
1496 out:
1497         POLICY_RDUNLOCK;
1498         return rc;
1499 }
1500
1501 int security_get_bools(int *len, char ***names, int **values)
1502 {
1503         int i, rc = -ENOMEM;
1504
1505         POLICY_RDLOCK;
1506         *names = NULL;
1507         *values = NULL;
1508
1509         *len = policydb.p_bools.nprim;
1510         if (!*len) {
1511                 rc = 0;
1512                 goto out;
1513         }
1514
1515         *names = (char**)kmalloc(sizeof(char*) * *len, GFP_ATOMIC);
1516         if (!*names)
1517                 goto err;
1518         memset(*names, 0, sizeof(char*) * *len);
1519
1520         *values = (int*)kmalloc(sizeof(int) * *len, GFP_ATOMIC);
1521         if (!*values)
1522                 goto err;
1523
1524         for (i = 0; i < *len; i++) {
1525                 size_t name_len;
1526                 (*values)[i] = policydb.bool_val_to_struct[i]->state;
1527                 name_len = strlen(policydb.p_bool_val_to_name[i]) + 1;
1528                 (*names)[i] = (char*)kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
1529                 if (!(*names)[i])
1530                         goto err;
1531                 strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len);
1532                 (*names)[i][name_len - 1] = 0;
1533         }
1534         rc = 0;
1535 out:
1536         POLICY_RDUNLOCK;
1537         return rc;
1538 err:
1539         if (*names) {
1540                 for (i = 0; i < *len; i++)
1541                         if ((*names)[i])
1542                                 kfree((*names)[i]);
1543         }
1544         if (*values)
1545                 kfree(*values);
1546         goto out;
1547 }
1548
1549
1550 int security_set_bools(int len, int *values)
1551 {
1552         int i, rc = 0;
1553         int lenp, seqno = 0;
1554         struct cond_node *cur;
1555
1556         POLICY_WRLOCK;
1557
1558         lenp = policydb.p_bools.nprim;
1559         if (len != lenp) {
1560                 rc = -EFAULT;
1561                 goto out;
1562         }
1563
1564         printk(KERN_INFO "security: committed booleans { ");
1565         for (i = 0; i < len; i++) {
1566                 if (values[i]) {
1567                         policydb.bool_val_to_struct[i]->state = 1;
1568                 } else {
1569                         policydb.bool_val_to_struct[i]->state = 0;
1570                 }
1571                 if (i != 0)
1572                         printk(", ");
1573                 printk("%s:%d", policydb.p_bool_val_to_name[i],
1574                        policydb.bool_val_to_struct[i]->state);
1575         }
1576         printk(" }\n");
1577
1578         for (cur = policydb.cond_list; cur != NULL; cur = cur->next) {
1579                 rc = evaluate_cond_node(&policydb, cur);
1580                 if (rc)
1581                         goto out;
1582         }
1583
1584         seqno = ++latest_granting;
1585
1586 out:
1587         POLICY_WRUNLOCK;
1588         if (!rc) {
1589                 avc_ss_reset(seqno);
1590                 selnl_notify_policyload(seqno);
1591         }
1592         return rc;
1593 }
1594
1595 int security_get_bool_value(int bool)
1596 {
1597         int rc = 0;
1598         int len;
1599
1600         POLICY_RDLOCK;
1601
1602         len = policydb.p_bools.nprim;
1603         if (bool >= len) {
1604                 rc = -EFAULT;
1605                 goto out;
1606         }
1607
1608         rc = policydb.bool_val_to_struct[bool]->state;
1609 out:
1610         POLICY_RDUNLOCK;
1611         return rc;
1612 }