cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/nsprepkg.c

/******************************************************************************
 *
 * Module Name: nsprepkg - Validation of package objects for predefined names
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acpredef.h"


#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsprepkg")

/* Local prototypes */
static acpi_status
acpi_ns_check_package_list(struct acpi_evaluate_info *info,
			   const union acpi_predefined_info *package,
			   union acpi_operand_object **elements, u32 count);

static acpi_status
acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
			       union acpi_operand_object **elements,
			       u8 type1,
			       u32 count1,
			       u8 type2, u32 count2, u32 start_index);

static acpi_status
acpi_ns_custom_package(struct acpi_evaluate_info *info,
		       union acpi_operand_object **elements, u32 count);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a returned package object for the correct count and
 *              correct type of all sub-objects.
 *
 ******************************************************************************/


acpi_status acpi_ns_check_package(struct acpi_evaluate_info *info, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; const union acpi_predefined_info *package; union acpi_operand_object **elements; acpi_status status = AE_OK; u32 expected_count; u32 count; u32 i; ACPI_FUNCTION_NAME(ns_check_package); /* The package info for this name is in the next table entry */ package = info->predefined + 1; ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s Validating return Package of Type %X, Count %X\n", info->full_pathname, package->ret_info.type, return_object->package.count)); /* * For variable-length Packages, we can safely remove all embedded * and trailing NULL package elements */ acpi_ns_remove_null_elements(info, package->ret_info.type, return_object); /* Extract package count and elements array */ elements = return_object->package.elements; count = return_object->package.count; /* * Most packages must have at least one element. The only exception * is the variable-length package (ACPI_PTYPE1_VAR). */ if (!count) { if (package->ret_info.type == ACPI_PTYPE1_VAR) { return (AE_OK); } ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Return Package has no elements (empty)")); return (AE_AML_OPERAND_VALUE); } /* * Decode the type of the expected package contents * * PTYPE1 packages contain no subpackages * PTYPE2 packages contain subpackages */ switch (package->ret_info.type) { case ACPI_PTYPE_CUSTOM: status = acpi_ns_custom_package(info, elements, count); break; case ACPI_PTYPE1_FIXED: /* * The package count is fixed and there are no subpackages * * If package is too small, exit. * If package is larger than expected, issue warning but continue */ expected_count = package->ret_info.count1 + package->ret_info.count2; if (count < expected_count) { goto package_too_small; } else if (count > expected_count) { ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Return Package is larger than needed - " "found %u, expected %u\n", info->full_pathname, count, expected_count)); } /* Validate all elements of the returned package */ status = acpi_ns_check_package_elements(info, elements, package->ret_info. object_type1, package->ret_info. count1, package->ret_info. object_type2, package->ret_info. count2, 0); break; case ACPI_PTYPE1_VAR: /* * The package count is variable, there are no subpackages, and all * elements must be of the same type */ for (i = 0; i < count; i++) { status = acpi_ns_check_object_type(info, elements, package->ret_info. object_type1, i); if (ACPI_FAILURE(status)) { return (status); } elements++; } break; case ACPI_PTYPE1_OPTION: /* * The package count is variable, there are no subpackages. There are * a fixed number of required elements, and a variable number of * optional elements. * * Check if package is at least as large as the minimum required */ expected_count = package->ret_info3.count; if (count < expected_count) { goto package_too_small; } /* Variable number of sub-objects */ for (i = 0; i < count; i++) { if (i < package->ret_info3.count) { /* These are the required package elements (0, 1, or 2) */ status = acpi_ns_check_object_type(info, elements, package-> ret_info3. object_type[i], i); if (ACPI_FAILURE(status)) { return (status); } } else { /* These are the optional package elements */ status = acpi_ns_check_object_type(info, elements, package-> ret_info3. tail_object_type, i); if (ACPI_FAILURE(status)) { return (status); } } elements++; } break; case ACPI_PTYPE2_REV_FIXED: /* First element is the (Integer) revision */ status = acpi_ns_check_object_type(info, elements, ACPI_RTYPE_INTEGER, 0); if (ACPI_FAILURE(status)) { return (status); } elements++; count--; /* Examine the subpackages */ status = acpi_ns_check_package_list(info, package, elements, count); break; case ACPI_PTYPE2_PKG_COUNT: /* First element is the (Integer) count of subpackages to follow */ status = acpi_ns_check_object_type(info, elements, ACPI_RTYPE_INTEGER, 0); if (ACPI_FAILURE(status)) { return (status); } /* * Count cannot be larger than the parent package length, but allow it * to be smaller. The >= accounts for the Integer above. */ expected_count = (u32)(*elements)->integer.value; if (expected_count >= count) { goto package_too_small; } count = expected_count; elements++; /* Examine the subpackages */ status = acpi_ns_check_package_list(info, package, elements, count); break; case ACPI_PTYPE2: case ACPI_PTYPE2_FIXED: case ACPI_PTYPE2_MIN: case ACPI_PTYPE2_COUNT: case ACPI_PTYPE2_FIX_VAR: /* * These types all return a single Package that consists of a * variable number of subpackages. * * First, ensure that the first element is a subpackage. If not, * the BIOS may have incorrectly returned the object as a single * package instead of a Package of Packages (a common error if * there is only one entry). We may be able to repair this by * wrapping the returned Package with a new outer Package. */ if (*elements && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) { /* Create the new outer package and populate it */ status = acpi_ns_wrap_with_package(info, return_object, return_object_ptr); if (ACPI_FAILURE(status)) { return (status); } /* Update locals to point to the new package (of 1 element) */ return_object = *return_object_ptr; elements = return_object->package.elements; count = 1; } /* Examine the subpackages */ status = acpi_ns_check_package_list(info, package, elements, count); break; case ACPI_PTYPE2_VAR_VAR: /* * Returns a variable list of packages, each with a variable list * of objects. */ break; case ACPI_PTYPE2_UUID_PAIR: /* The package must contain pairs of (UUID + type) */ if (count & 1) { expected_count = count + 1; goto package_too_small; } while (count > 0) { status = acpi_ns_check_object_type(info, elements, package->ret_info. object_type1, 0); if (ACPI_FAILURE(status)) { return (status); } /* Validate length of the UUID buffer */ if ((*elements)->buffer.length != 16) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Invalid length for UUID Buffer")); return (AE_AML_OPERAND_VALUE); } status = acpi_ns_check_object_type(info, elements + 1, package->ret_info. object_type2, 0); if (ACPI_FAILURE(status)) { return (status); } elements += 2; count -= 2; } break; default: /* Should not get here if predefined info table is correct */ ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Invalid internal return type in table entry: %X", package->ret_info.type)); return (AE_AML_INTERNAL); } return (status); package_too_small: /* Error exit for the case with an incorrect package count */ ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Return Package is too small - found %u elements, expected %u", count, expected_count)); return (AE_AML_OPERAND_VALUE); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore76084.44%685.71%
Mika Westerberg14015.56%114.29%
Total900100.00%7100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_check_package_list * * PARAMETERS: info - Method execution information block * package - Pointer to package-specific info for method * elements - Element list of parent package. All elements * of this list should be of type Package. * count - Count of subpackages * * RETURN: Status * * DESCRIPTION: Examine a list of subpackages * ******************************************************************************/
static acpi_status acpi_ns_check_package_list(struct acpi_evaluate_info *info, const union acpi_predefined_info *package, union acpi_operand_object **elements, u32 count) { union acpi_operand_object *sub_package; union acpi_operand_object **sub_elements; acpi_status status; u32 expected_count; u32 i; u32 j; /* * Validate each subpackage in the parent Package * * NOTE: assumes list of subpackages contains no NULL elements. * Any NULL elements should have been removed by earlier call * to acpi_ns_remove_null_elements. */ for (i = 0; i < count; i++) { sub_package = *elements; sub_elements = sub_package->package.elements; info->parent_package = sub_package; /* Each sub-object must be of type Package */ status = acpi_ns_check_object_type(info, &sub_package, ACPI_RTYPE_PACKAGE, i); if (ACPI_FAILURE(status)) { return (status); } /* Examine the different types of expected subpackages */ info->parent_package = sub_package; switch (package->ret_info.type) { case ACPI_PTYPE2: case ACPI_PTYPE2_PKG_COUNT: case ACPI_PTYPE2_REV_FIXED: /* Each subpackage has a fixed number of elements */ expected_count = package->ret_info.count1 + package->ret_info.count2; if (sub_package->package.count < expected_count) { goto package_too_small; } status = acpi_ns_check_package_elements(info, sub_elements, package->ret_info. object_type1, package->ret_info. count1, package->ret_info. object_type2, package->ret_info. count2, 0); if (ACPI_FAILURE(status)) { return (status); } break; case ACPI_PTYPE2_FIX_VAR: /* * Each subpackage has a fixed number of elements and an * optional element */ expected_count = package->ret_info.count1 + package->ret_info.count2; if (sub_package->package.count < expected_count) { goto package_too_small; } status = acpi_ns_check_package_elements(info, sub_elements, package->ret_info. object_type1, package->ret_info. count1, package->ret_info. object_type2, sub_package->package. count - package->ret_info. count1, 0); if (ACPI_FAILURE(status)) { return (status); } break; case ACPI_PTYPE2_VAR_VAR: /* * Each subpackage has a fixed or variable number of elements */ break; case ACPI_PTYPE2_FIXED: /* Each subpackage has a fixed length */ expected_count = package->ret_info2.count; if (sub_package->package.count < expected_count) { goto package_too_small; } /* Check the type of each subpackage element */ for (j = 0; j < expected_count; j++) { status = acpi_ns_check_object_type(info, &sub_elements[j], package-> ret_info2. object_type[j], j); if (ACPI_FAILURE(status)) { return (status); } } break; case ACPI_PTYPE2_MIN: /* Each subpackage has a variable but minimum length */ expected_count = package->ret_info.count1; if (sub_package->package.count < expected_count) { goto package_too_small; } /* Check the type of each subpackage element */ status = acpi_ns_check_package_elements(info, sub_elements, package->ret_info. object_type1, sub_package->package. count, 0, 0, 0); if (ACPI_FAILURE(status)) { return (status); } break; case ACPI_PTYPE2_COUNT: /* * First element is the (Integer) count of elements, including * the count field (the ACPI name is num_elements) */ status = acpi_ns_check_object_type(info, sub_elements, ACPI_RTYPE_INTEGER, 0); if (ACPI_FAILURE(status)) { return (status); } /* * Make sure package is large enough for the Count and is * is as large as the minimum size */ expected_count = (u32)(*sub_elements)->integer.value; if (sub_package->package.count < expected_count) { goto package_too_small; } if (sub_package->package.count < package->ret_info.count1) { expected_count = package->ret_info.count1; goto package_too_small; } if (expected_count == 0) { /* * Either the num_entries element was originally zero or it was * a NULL element and repaired to an Integer of value zero. * In either case, repair it by setting num_entries to be the * actual size of the subpackage. */ expected_count = sub_package->package.count; (*sub_elements)->integer.value = expected_count; } /* Check the type of each subpackage element */ status = acpi_ns_check_package_elements(info, (sub_elements + 1), package->ret_info. object_type1, (expected_count - 1), 0, 0, 1); if (ACPI_FAILURE(status)) { return (status); } break; default: /* Should not get here, type was validated by caller */ return (AE_AML_INTERNAL); } elements++; } return (AE_OK); package_too_small: /* The subpackage count was smaller than required */ ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Return SubPackage[%u] is too small - found %u elements, expected %u", i, sub_package->package.count, expected_count)); return (AE_AML_OPERAND_VALUE); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore678100.00%4100.00%
Total678100.00%4100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_custom_package * * PARAMETERS: info - Method execution information block * elements - Pointer to the package elements array * count - Element count for the package * * RETURN: Status * * DESCRIPTION: Check a returned package object for the correct count and * correct type of all sub-objects. * * NOTE: Currently used for the _BIX method only. When needed for two or more * methods, probably a detect/dispatch mechanism will be required. * ******************************************************************************/
static acpi_status acpi_ns_custom_package(struct acpi_evaluate_info *info, union acpi_operand_object **elements, u32 count) { u32 expected_count; u32 version; acpi_status status = AE_OK; ACPI_FUNCTION_NAME(ns_custom_package); /* Get version number, must be Integer */ if ((*elements)->common.type != ACPI_TYPE_INTEGER) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Return Package has invalid object type for version number")); return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } version = (u32)(*elements)->integer.value; expected_count = 21; /* Version 1 */ if (version == 0) { expected_count = 20; /* Version 0 */ } if (count < expected_count) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, "Return Package is too small - found %u elements, expected %u", count, expected_count)); return_ACPI_STATUS(AE_AML_OPERAND_VALUE); } else if (count > expected_count) { ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Return Package is larger than needed - " "found %u, expected %u\n", info->full_pathname, count, expected_count)); } /* Validate all elements of the returned package */ status = acpi_ns_check_package_elements(info, elements, ACPI_RTYPE_INTEGER, 16, ACPI_RTYPE_STRING, 4, 0); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Version 1 has a single trailing integer */ if (version > 0) { status = acpi_ns_check_package_elements(info, elements + 20, ACPI_RTYPE_INTEGER, 1, 0, 0, 20); } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore236100.00%1100.00%
Total236100.00%1100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_check_package_elements * * PARAMETERS: info - Method execution information block * elements - Pointer to the package elements array * type1 - Object type for first group * count1 - Count for first group * type2 - Object type for second group * count2 - Count for second group * start_index - Start of the first group of elements * * RETURN: Status * * DESCRIPTION: Check that all elements of a package are of the correct object * type. Supports up to two groups of different object types. * ******************************************************************************/
static acpi_status acpi_ns_check_package_elements(struct acpi_evaluate_info *info, union acpi_operand_object **elements, u8 type1, u32 count1, u8 type2, u32 count2, u32 start_index) { union acpi_operand_object **this_element = elements; acpi_status status; u32 i; /* * Up to two groups of package elements are supported by the data * structure. All elements in each group must be of the same type. * The second group can have a count of zero. */ for (i = 0; i < count1; i++) { status = acpi_ns_check_object_type(info, this_element, type1, i + start_index); if (ACPI_FAILURE(status)) { return (status); } this_element++; } for (i = 0; i < count2; i++) { status = acpi_ns_check_object_type(info, this_element, type2, (i + count1 + start_index)); if (ACPI_FAILURE(status)) { return (status); } this_element++; } return (AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore150100.00%2100.00%
Total150100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore192693.22%787.50%
Mika Westerberg1406.78%112.50%
Total2066100.00%8100.00%
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