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linux/drivers/acpi/acpica/nsprepkg.c

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: nsprepkg - Validation of package objects for predefined names
*
* Copyright (C) 2000 - 2019, Intel Corp.
*
*****************************************************************************/
#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);
}
/*******************************************************************************
*
* 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 */
ACPI_ERROR((AE_INFO, "Invalid Package type: %X",
package->ret_info.type));
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);
}
/*******************************************************************************
*
* 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);
}
/*******************************************************************************
*
* 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);
}
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