kernel/drivers/acpi/acpica/nsprepkg.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsprepkg - Validation of package objects for predefined names
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47 #include "acpredef.h"
  48
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsprepkg")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
  55                            const union acpi_predefined_info *package,
  56                            union acpi_operand_object **elements, u32 count);
  57
  58 static acpi_status
  59 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
  60                                union acpi_operand_object **elements,
  61                                u8 type1,
  62                                u32 count1,
  63                                u8 type2, u32 count2, u32 start_index);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ns_check_package
  68  *
  69  * PARAMETERS:  info                - Method execution information block
  70  *              return_object_ptr   - Pointer to the object returned from the
  71  *                                    evaluation of a method or object
  72  *
  73  * RETURN:      Status
  74  *
  75  * DESCRIPTION: Check a returned package object for the correct count and
  76  *              correct type of all sub-objects.
  77  *
  78  ******************************************************************************/
  79
  80 acpi_status
  81 acpi_ns_check_package(struct acpi_evaluate_info *info,
  82                       union acpi_operand_object **return_object_ptr)
  83 {
  84         union acpi_operand_object *return_object = *return_object_ptr;
  85         const union acpi_predefined_info *package;
  86         union acpi_operand_object **elements;
  87         acpi_status status = AE_OK;
  88         u32 expected_count;
  89         u32 count;
  90         u32 i;
  91
  92         ACPI_FUNCTION_NAME(ns_check_package);
  93
  94         /* The package info for this name is in the next table entry */
  95
  96         package = info->predefined + 1;
  97
  98         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
  99                           "%s Validating return Package of Type %X, Count %X\n",
 100                           info->full_pathname, package->ret_info.type,
 101                           return_object->package.count));
 102
 103         /*
 104          * For variable-length Packages, we can safely remove all embedded
 105          * and trailing NULL package elements
 106          */
 107         acpi_ns_remove_null_elements(info, package->ret_info.type,
 108                                      return_object);
 109
 110         /* Extract package count and elements array */
 111
 112         elements = return_object->package.elements;
 113         count = return_object->package.count;
 114
 115         /*
 116          * Most packages must have at least one element. The only exception
 117          * is the variable-length package (ACPI_PTYPE1_VAR).
 118          */
 119         if (!count) {
 120                 if (package->ret_info.type == ACPI_PTYPE1_VAR) {
 121                         return (AE_OK);
 122                 }
 123
 124                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 125                                       info->node_flags,
 126                                       "Return Package has no elements (empty)"));
 127
 128                 return (AE_AML_OPERAND_VALUE);
 129         }
 130
 131         /*
 132          * Decode the type of the expected package contents
 133          *
 134          * PTYPE1 packages contain no subpackages
 135          * PTYPE2 packages contain subpackages
 136          */
 137         switch (package->ret_info.type) {
 138         case ACPI_PTYPE1_FIXED:
 139                 /*
 140                  * The package count is fixed and there are no subpackages
 141                  *
 142                  * If package is too small, exit.
 143                  * If package is larger than expected, issue warning but continue
 144                  */
 145                 expected_count =
 146                     package->ret_info.count1 + package->ret_info.count2;
 147                 if (count < expected_count) {
 148                         goto package_too_small;
 149                 } else if (count > expected_count) {
 150                         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 151                                           "%s: Return Package is larger than needed - "
 152                                           "found %u, expected %u\n",
 153                                           info->full_pathname, count,
 154                                           expected_count));
 155                 }
 156
 157                 /* Validate all elements of the returned package */
 158
 159                 status = acpi_ns_check_package_elements(info, elements,
 160                                                         package->ret_info.
 161                                                         object_type1,
 162                                                         package->ret_info.
 163                                                         count1,
 164                                                         package->ret_info.
 165                                                         object_type2,
 166                                                         package->ret_info.
 167                                                         count2, 0);
 168                 break;
 169
 170         case ACPI_PTYPE1_VAR:
 171                 /*
 172                  * The package count is variable, there are no subpackages, and all
 173                  * elements must be of the same type
 174                  */
 175                 for (i = 0; i < count; i++) {
 176                         status = acpi_ns_check_object_type(info, elements,
 177                                                            package->ret_info.
 178                                                            object_type1, i);
 179                         if (ACPI_FAILURE(status)) {
 180                                 return (status);
 181                         }
 182                         elements++;
 183                 }
 184                 break;
 185
 186         case ACPI_PTYPE1_OPTION:
 187                 /*
 188                  * The package count is variable, there are no subpackages. There are
 189                  * a fixed number of required elements, and a variable number of
 190                  * optional elements.
 191                  *
 192                  * Check if package is at least as large as the minimum required
 193                  */
 194                 expected_count = package->ret_info3.count;
 195                 if (count < expected_count) {
 196                         goto package_too_small;
 197                 }
 198
 199                 /* Variable number of sub-objects */
 200
 201                 for (i = 0; i < count; i++) {
 202                         if (i < package->ret_info3.count) {
 203
 204                                 /* These are the required package elements (0, 1, or 2) */
 205
 206                                 status =
 207                                     acpi_ns_check_object_type(info, elements,
 208                                                               package->
 209                                                               ret_info3.
 210                                                               object_type[i],
 211                                                               i);
 212                                 if (ACPI_FAILURE(status)) {
 213                                         return (status);
 214                                 }
 215                         } else {
 216                                 /* These are the optional package elements */
 217
 218                                 status =
 219                                     acpi_ns_check_object_type(info, elements,
 220                                                               package->
 221                                                               ret_info3.
 222                                                               tail_object_type,
 223                                                               i);
 224                                 if (ACPI_FAILURE(status)) {
 225                                         return (status);
 226                                 }
 227                         }
 228                         elements++;
 229                 }
 230                 break;
 231
 232         case ACPI_PTYPE2_REV_FIXED:
 233
 234                 /* First element is the (Integer) revision */
 235
 236                 status = acpi_ns_check_object_type(info, elements,
 237                                                    ACPI_RTYPE_INTEGER, 0);
 238                 if (ACPI_FAILURE(status)) {
 239                         return (status);
 240                 }
 241
 242                 elements++;
 243                 count--;
 244
 245                 /* Examine the subpackages */
 246
 247                 status =
 248                     acpi_ns_check_package_list(info, package, elements, count);
 249                 break;
 250
 251         case ACPI_PTYPE2_PKG_COUNT:
 252
 253                 /* First element is the (Integer) count of subpackages to follow */
 254
 255                 status = acpi_ns_check_object_type(info, elements,
 256                                                    ACPI_RTYPE_INTEGER, 0);
 257                 if (ACPI_FAILURE(status)) {
 258                         return (status);
 259                 }
 260
 261                 /*
 262                  * Count cannot be larger than the parent package length, but allow it
 263                  * to be smaller. The >= accounts for the Integer above.
 264                  */
 265                 expected_count = (u32)(*elements)->integer.value;
 266                 if (expected_count >= count) {
 267                         goto package_too_small;
 268                 }
 269
 270                 count = expected_count;
 271                 elements++;
 272
 273                 /* Examine the subpackages */
 274
 275                 status =
 276                     acpi_ns_check_package_list(info, package, elements, count);
 277                 break;
 278
 279         case ACPI_PTYPE2:
 280         case ACPI_PTYPE2_FIXED:
 281         case ACPI_PTYPE2_MIN:
 282         case ACPI_PTYPE2_COUNT:
 283         case ACPI_PTYPE2_FIX_VAR:
 284                 /*
 285                  * These types all return a single Package that consists of a
 286                  * variable number of subpackages.
 287                  *
 288                  * First, ensure that the first element is a subpackage. If not,
 289                  * the BIOS may have incorrectly returned the object as a single
 290                  * package instead of a Package of Packages (a common error if
 291                  * there is only one entry). We may be able to repair this by
 292                  * wrapping the returned Package with a new outer Package.
 293                  */
 294                 if (*elements
 295                     && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {
 296
 297                         /* Create the new outer package and populate it */
 298
 299                         status =
 300                             acpi_ns_wrap_with_package(info, return_object,
 301                                                       return_object_ptr);
 302                         if (ACPI_FAILURE(status)) {
 303                                 return (status);
 304                         }
 305
 306                         /* Update locals to point to the new package (of 1 element) */
 307
 308                         return_object = *return_object_ptr;
 309                         elements = return_object->package.elements;
 310                         count = 1;
 311                 }
 312
 313                 /* Examine the subpackages */
 314
 315                 status =
 316                     acpi_ns_check_package_list(info, package, elements, count);
 317                 break;
 318
 319         case ACPI_PTYPE2_VAR_VAR:
 320                 /*
 321                  * Returns a variable list of packages, each with a variable list
 322                  * of objects.
 323                  */
 324                 break;
 325
 326         case ACPI_PTYPE2_UUID_PAIR:
 327
 328                 /* The package must contain pairs of (UUID + type) */
 329
 330                 if (count & 1) {
 331                         expected_count = count + 1;
 332                         goto package_too_small;
 333                 }
 334
 335                 while (count > 0) {
 336                         status = acpi_ns_check_object_type(info, elements,
 337                                                            package->ret_info.
 338                                                            object_type1, 0);
 339                         if (ACPI_FAILURE(status)) {
 340                                 return (status);
 341                         }
 342
 343                         /* Validate length of the UUID buffer */
 344
 345                         if ((*elements)->buffer.length != 16) {
 346                                 ACPI_WARN_PREDEFINED((AE_INFO,
 347                                                       info->full_pathname,
 348                                                       info->node_flags,
 349                                                       "Invalid length for UUID Buffer"));
 350                                 return (AE_AML_OPERAND_VALUE);
 351                         }
 352
 353                         status = acpi_ns_check_object_type(info, elements + 1,
 354                                                            package->ret_info.
 355                                                            object_type2, 0);
 356                         if (ACPI_FAILURE(status)) {
 357                                 return (status);
 358                         }
 359
 360                         elements += 2;
 361                         count -= 2;
 362                 }
 363                 break;
 364
 365         default:
 366
 367                 /* Should not get here if predefined info table is correct */
 368
 369                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 370                                       info->node_flags,
 371                                       "Invalid internal return type in table entry: %X",
 372                                       package->ret_info.type));
 373
 374                 return (AE_AML_INTERNAL);
 375         }
 376
 377         return (status);
 378
 379 package_too_small:
 380
 381         /* Error exit for the case with an incorrect package count */
 382
 383         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
 384                               "Return Package is too small - found %u elements, expected %u",
 385                               count, expected_count));
 386
 387         return (AE_AML_OPERAND_VALUE);
 388 }
 389
 390 /*******************************************************************************
 391  *
 392  * FUNCTION:    acpi_ns_check_package_list
 393  *
 394  * PARAMETERS:  info            - Method execution information block
 395  *              package         - Pointer to package-specific info for method
 396  *              elements        - Element list of parent package. All elements
 397  *                                of this list should be of type Package.
 398  *              count           - Count of subpackages
 399  *
 400  * RETURN:      Status
 401  *
 402  * DESCRIPTION: Examine a list of subpackages
 403  *
 404  ******************************************************************************/
 405
 406 static acpi_status
 407 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
 408                            const union acpi_predefined_info *package,
 409                            union acpi_operand_object **elements, u32 count)
 410 {
 411         union acpi_operand_object *sub_package;
 412         union acpi_operand_object **sub_elements;
 413         acpi_status status;
 414         u32 expected_count;
 415         u32 i;
 416         u32 j;
 417
 418         /*
 419          * Validate each subpackage in the parent Package
 420          *
 421          * NOTE: assumes list of subpackages contains no NULL elements.
 422          * Any NULL elements should have been removed by earlier call
 423          * to acpi_ns_remove_null_elements.
 424          */
 425         for (i = 0; i < count; i++) {
 426                 sub_package = *elements;
 427                 sub_elements = sub_package->package.elements;
 428                 info->parent_package = sub_package;
 429
 430                 /* Each sub-object must be of type Package */
 431
 432                 status = acpi_ns_check_object_type(info, &sub_package,
 433                                                    ACPI_RTYPE_PACKAGE, i);
 434                 if (ACPI_FAILURE(status)) {
 435                         return (status);
 436                 }
 437
 438                 /* Examine the different types of expected subpackages */
 439
 440                 info->parent_package = sub_package;
 441                 switch (package->ret_info.type) {
 442                 case ACPI_PTYPE2:
 443                 case ACPI_PTYPE2_PKG_COUNT:
 444                 case ACPI_PTYPE2_REV_FIXED:
 445
 446                         /* Each subpackage has a fixed number of elements */
 447
 448                         expected_count =
 449                             package->ret_info.count1 + package->ret_info.count2;
 450                         if (sub_package->package.count < expected_count) {
 451                                 goto package_too_small;
 452                         }
 453
 454                         status =
 455                             acpi_ns_check_package_elements(info, sub_elements,
 456                                                            package->ret_info.
 457                                                            object_type1,
 458                                                            package->ret_info.
 459                                                            count1,
 460                                                            package->ret_info.
 461                                                            object_type2,
 462                                                            package->ret_info.
 463                                                            count2, 0);
 464                         if (ACPI_FAILURE(status)) {
 465                                 return (status);
 466                         }
 467                         break;
 468
 469                 case ACPI_PTYPE2_FIX_VAR:
 470                         /*
 471                          * Each subpackage has a fixed number of elements and an
 472                          * optional element
 473                          */
 474                         expected_count =
 475                             package->ret_info.count1 + package->ret_info.count2;
 476                         if (sub_package->package.count < expected_count) {
 477                                 goto package_too_small;
 478                         }
 479
 480                         status =
 481                             acpi_ns_check_package_elements(info, sub_elements,
 482                                                            package->ret_info.
 483                                                            object_type1,
 484                                                            package->ret_info.
 485                                                            count1,
 486                                                            package->ret_info.
 487                                                            object_type2,
 488                                                            sub_package->package.
 489                                                            count -
 490                                                            package->ret_info.
 491                                                            count1, 0);
 492                         if (ACPI_FAILURE(status)) {
 493                                 return (status);
 494                         }
 495                         break;
 496
 497                 case ACPI_PTYPE2_VAR_VAR:
 498                         /*
 499                          * Each subpackage has a fixed or variable number of elements
 500                          */
 501                         break;
 502
 503                 case ACPI_PTYPE2_FIXED:
 504
 505                         /* Each subpackage has a fixed length */
 506
 507                         expected_count = package->ret_info2.count;
 508                         if (sub_package->package.count < expected_count) {
 509                                 goto package_too_small;
 510                         }
 511
 512                         /* Check the type of each subpackage element */
 513
 514                         for (j = 0; j < expected_count; j++) {
 515                                 status =
 516                                     acpi_ns_check_object_type(info,
 517                                                               &sub_elements[j],
 518                                                               package->
 519                                                               ret_info2.
 520                                                               object_type[j],
 521                                                               j);
 522                                 if (ACPI_FAILURE(status)) {
 523                                         return (status);
 524                                 }
 525                         }
 526                         break;
 527
 528                 case ACPI_PTYPE2_MIN:
 529
 530                         /* Each subpackage has a variable but minimum length */
 531
 532                         expected_count = package->ret_info.count1;
 533                         if (sub_package->package.count < expected_count) {
 534                                 goto package_too_small;
 535                         }
 536
 537                         /* Check the type of each subpackage element */
 538
 539                         status =
 540                             acpi_ns_check_package_elements(info, sub_elements,
 541                                                            package->ret_info.
 542                                                            object_type1,
 543                                                            sub_package->package.
 544                                                            count, 0, 0, 0);
 545                         if (ACPI_FAILURE(status)) {
 546                                 return (status);
 547                         }
 548                         break;
 549
 550                 case ACPI_PTYPE2_COUNT:
 551                         /*
 552                          * First element is the (Integer) count of elements, including
 553                          * the count field (the ACPI name is num_elements)
 554                          */
 555                         status = acpi_ns_check_object_type(info, sub_elements,
 556                                                            ACPI_RTYPE_INTEGER,
 557                                                            0);
 558                         if (ACPI_FAILURE(status)) {
 559                                 return (status);
 560                         }
 561
 562                         /*
 563                          * Make sure package is large enough for the Count and is
 564                          * is as large as the minimum size
 565                          */
 566                         expected_count = (u32)(*sub_elements)->integer.value;
 567                         if (sub_package->package.count < expected_count) {
 568                                 goto package_too_small;
 569                         }
 570                         if (sub_package->package.count <
 571                             package->ret_info.count1) {
 572                                 expected_count = package->ret_info.count1;
 573                                 goto package_too_small;
 574                         }
 575                         if (expected_count == 0) {
 576                                 /*
 577                                  * Either the num_entries element was originally zero or it was
 578                                  * a NULL element and repaired to an Integer of value zero.
 579                                  * In either case, repair it by setting num_entries to be the
 580                                  * actual size of the subpackage.
 581                                  */
 582                                 expected_count = sub_package->package.count;
 583                                 (*sub_elements)->integer.value = expected_count;
 584                         }
 585
 586                         /* Check the type of each subpackage element */
 587
 588                         status =
 589                             acpi_ns_check_package_elements(info,
 590                                                            (sub_elements + 1),
 591                                                            package->ret_info.
 592                                                            object_type1,
 593                                                            (expected_count - 1),
 594                                                            0, 0, 1);
 595                         if (ACPI_FAILURE(status)) {
 596                                 return (status);
 597                         }
 598                         break;
 599
 600                 default:        /* Should not get here, type was validated by caller */
 601
 602                         return (AE_AML_INTERNAL);
 603                 }
 604
 605                 elements++;
 606         }
 607
 608         return (AE_OK);
 609
 610 package_too_small:
 611
 612         /* The subpackage count was smaller than required */
 613
 614         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
 615                               "Return SubPackage[%u] is too small - found %u elements, expected %u",
 616                               i, sub_package->package.count, expected_count));
 617
 618         return (AE_AML_OPERAND_VALUE);
 619 }
 620
 621 /*******************************************************************************
 622  *
 623  * FUNCTION:    acpi_ns_check_package_elements
 624  *
 625  * PARAMETERS:  info            - Method execution information block
 626  *              elements        - Pointer to the package elements array
 627  *              type1           - Object type for first group
 628  *              count1          - Count for first group
 629  *              type2           - Object type for second group
 630  *              count2          - Count for second group
 631  *              start_index     - Start of the first group of elements
 632  *
 633  * RETURN:      Status
 634  *
 635  * DESCRIPTION: Check that all elements of a package are of the correct object
 636  *              type. Supports up to two groups of different object types.
 637  *
 638  ******************************************************************************/
 639
 640 static acpi_status
 641 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
 642                                union acpi_operand_object **elements,
 643                                u8 type1,
 644                                u32 count1,
 645                                u8 type2, u32 count2, u32 start_index)
 646 {
 647         union acpi_operand_object **this_element = elements;
 648         acpi_status status;
 649         u32 i;
 650
 651         /*
 652          * Up to two groups of package elements are supported by the data
 653          * structure. All elements in each group must be of the same type.
 654          * The second group can have a count of zero.
 655          */
 656         for (i = 0; i < count1; i++) {
 657                 status = acpi_ns_check_object_type(info, this_element,
 658                                                    type1, i + start_index);
 659                 if (ACPI_FAILURE(status)) {
 660                         return (status);
 661                 }
 662                 this_element++;
 663         }
 664
 665         for (i = 0; i < count2; i++) {
 666                 status = acpi_ns_check_object_type(info, this_element,
 667                                                    type2,
 668                                                    (i + count1 + start_index));
 669                 if (ACPI_FAILURE(status)) {
 670                         return (status);
 671                 }
 672                 this_element++;
 673         }
 674
 675         return (AE_OK);
 676 }