53951bd57d
acpi_rs_get_pci_routing_table_length is not performing sufficient validation on the package returned from _PRT. It assumes a package of packages and fails/faults if this is not the case. We should validate each subpackage when extracted from the parent package, and not accept objects of the wrong type, since that will just cause the scanning to fail (likely with a kernel oops). This can only happen with a serious BIOS bug, and is accompanied by a warning something like this: ACPI Warning (nspredef-0949): \_SB_.PCI0.PEG4._PRT: Return Package type mismatch at index 0 - found Integer, expected Package [20090320] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
624 lines
18 KiB
C
624 lines
18 KiB
C
/*******************************************************************************
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*
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* Module Name: rscalc - Calculate stream and list lengths
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acresrc.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_RESOURCES
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ACPI_MODULE_NAME("rscalc")
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/* Local prototypes */
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static u8 acpi_rs_count_set_bits(u16 bit_field);
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static acpi_rs_length
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acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);
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static u32
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acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_count_set_bits
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*
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* PARAMETERS: bit_field - Field in which to count bits
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*
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* RETURN: Number of bits set within the field
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*
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* DESCRIPTION: Count the number of bits set in a resource field. Used for
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* (Short descriptor) interrupt and DMA lists.
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*
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******************************************************************************/
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static u8 acpi_rs_count_set_bits(u16 bit_field)
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{
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u8 bits_set;
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ACPI_FUNCTION_ENTRY();
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for (bits_set = 0; bit_field; bits_set++) {
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/* Zero the least significant bit that is set */
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bit_field &= (u16) (bit_field - 1);
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}
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return bits_set;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_struct_option_length
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*
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* PARAMETERS: resource_source - Pointer to optional descriptor field
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common code to handle optional resource_source_index and
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* resource_source fields in some Large descriptors. Used during
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* list-to-stream conversion
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*
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******************************************************************************/
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static acpi_rs_length
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acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
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{
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ACPI_FUNCTION_ENTRY();
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/*
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* If the resource_source string is valid, return the size of the string
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* (string_length includes the NULL terminator) plus the size of the
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* resource_source_index (1).
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*/
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if (resource_source->string_ptr) {
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return ((acpi_rs_length) (resource_source->string_length + 1));
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}
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return (0);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_stream_option_length
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*
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* PARAMETERS: resource_length - Length from the resource header
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* minimum_total_length - Minimum length of this resource, before
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* any optional fields. Includes header size
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*
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* RETURN: Length of optional string (0 if no string present)
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*
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* DESCRIPTION: Common code to handle optional resource_source_index and
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* resource_source fields in some Large descriptors. Used during
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* stream-to-list conversion
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*
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******************************************************************************/
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static u32
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acpi_rs_stream_option_length(u32 resource_length,
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u32 minimum_aml_resource_length)
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{
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u32 string_length = 0;
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ACPI_FUNCTION_ENTRY();
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/*
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* The resource_source_index and resource_source are optional elements of some
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* Large-type resource descriptors.
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*/
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/*
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* If the length of the actual resource descriptor is greater than the ACPI
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* spec-defined minimum length, it means that a resource_source_index exists
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* and is followed by a (required) null terminated string. The string length
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* (including the null terminator) is the resource length minus the minimum
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* length, minus one byte for the resource_source_index itself.
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*/
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if (resource_length > minimum_aml_resource_length) {
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/* Compute the length of the optional string */
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string_length =
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resource_length - minimum_aml_resource_length - 1;
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}
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/*
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* Round the length up to a multiple of the native word in order to
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* guarantee that the entire resource descriptor is native word aligned
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*/
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return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_get_aml_length
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*
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* PARAMETERS: Resource - Pointer to the resource linked list
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* size_needed - Where the required size is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Takes a linked list of internal resource descriptors and
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* calculates the size buffer needed to hold the corresponding
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* external resource byte stream.
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*
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******************************************************************************/
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acpi_status
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acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed)
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{
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acpi_size aml_size_needed = 0;
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acpi_rs_length total_size;
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ACPI_FUNCTION_TRACE(rs_get_aml_length);
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/* Traverse entire list of internal resource descriptors */
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while (resource) {
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/* Validate the descriptor type */
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if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
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return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
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}
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/* Get the base size of the (external stream) resource descriptor */
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total_size = acpi_gbl_aml_resource_sizes[resource->type];
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/*
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* Augment the base size for descriptors with optional and/or
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* variable-length fields
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*/
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switch (resource->type) {
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case ACPI_RESOURCE_TYPE_IRQ:
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/* Length can be 3 or 2 */
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if (resource->data.irq.descriptor_length == 2) {
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total_size--;
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}
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break;
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case ACPI_RESOURCE_TYPE_START_DEPENDENT:
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/* Length can be 1 or 0 */
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if (resource->data.irq.descriptor_length == 0) {
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total_size--;
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}
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break;
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case ACPI_RESOURCE_TYPE_VENDOR:
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/*
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* Vendor Defined Resource:
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* For a Vendor Specific resource, if the Length is between 1 and 7
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* it will be created as a Small Resource data type, otherwise it
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* is a Large Resource data type.
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*/
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if (resource->data.vendor.byte_length > 7) {
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/* Base size of a Large resource descriptor */
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total_size =
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sizeof(struct aml_resource_large_header);
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}
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/* Add the size of the vendor-specific data */
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total_size = (acpi_rs_length)
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(total_size + resource->data.vendor.byte_length);
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break;
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case ACPI_RESOURCE_TYPE_END_TAG:
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/*
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* End Tag:
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* We are done -- return the accumulated total size.
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*/
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*size_needed = aml_size_needed + total_size;
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/* Normal exit */
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return_ACPI_STATUS(AE_OK);
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case ACPI_RESOURCE_TYPE_ADDRESS16:
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/*
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* 16-Bit Address Resource:
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* Add the size of the optional resource_source info
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*/
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total_size = (acpi_rs_length)
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(total_size +
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acpi_rs_struct_option_length(&resource->data.
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address16.
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resource_source));
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break;
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case ACPI_RESOURCE_TYPE_ADDRESS32:
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/*
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* 32-Bit Address Resource:
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* Add the size of the optional resource_source info
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*/
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total_size = (acpi_rs_length)
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(total_size +
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acpi_rs_struct_option_length(&resource->data.
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address32.
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resource_source));
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break;
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case ACPI_RESOURCE_TYPE_ADDRESS64:
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/*
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* 64-Bit Address Resource:
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* Add the size of the optional resource_source info
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*/
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total_size = (acpi_rs_length)
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(total_size +
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acpi_rs_struct_option_length(&resource->data.
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address64.
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resource_source));
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break;
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case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
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/*
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* Extended IRQ Resource:
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* Add the size of each additional optional interrupt beyond the
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* required 1 (4 bytes for each u32 interrupt number)
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*/
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total_size = (acpi_rs_length)
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(total_size +
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((resource->data.extended_irq.interrupt_count -
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1) * 4) +
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/* Add the size of the optional resource_source info */
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acpi_rs_struct_option_length(&resource->data.
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extended_irq.
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resource_source));
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break;
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default:
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break;
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}
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/* Update the total */
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aml_size_needed += total_size;
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/* Point to the next object */
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resource =
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ACPI_ADD_PTR(struct acpi_resource, resource,
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resource->length);
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}
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/* Did not find an end_tag resource descriptor */
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return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_get_list_length
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*
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* PARAMETERS: aml_buffer - Pointer to the resource byte stream
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* aml_buffer_length - Size of aml_buffer
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* size_needed - Where the size needed is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Takes an external resource byte stream and calculates the size
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* buffer needed to hold the corresponding internal resource
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* descriptor linked list.
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*
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******************************************************************************/
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acpi_status
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acpi_rs_get_list_length(u8 * aml_buffer,
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u32 aml_buffer_length, acpi_size * size_needed)
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{
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acpi_status status;
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u8 *end_aml;
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u8 *buffer;
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u32 buffer_size;
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u16 temp16;
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u16 resource_length;
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u32 extra_struct_bytes;
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u8 resource_index;
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u8 minimum_aml_resource_length;
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ACPI_FUNCTION_TRACE(rs_get_list_length);
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*size_needed = 0;
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end_aml = aml_buffer + aml_buffer_length;
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/* Walk the list of AML resource descriptors */
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while (aml_buffer < end_aml) {
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/* Validate the Resource Type and Resource Length */
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status = acpi_ut_validate_resource(aml_buffer, &resource_index);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Get the resource length and base (minimum) AML size */
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resource_length = acpi_ut_get_resource_length(aml_buffer);
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minimum_aml_resource_length =
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acpi_gbl_resource_aml_sizes[resource_index];
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/*
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* Augment the size for descriptors with optional
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* and/or variable length fields
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*/
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extra_struct_bytes = 0;
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buffer =
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aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
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switch (acpi_ut_get_resource_type(aml_buffer)) {
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case ACPI_RESOURCE_NAME_IRQ:
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/*
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* IRQ Resource:
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* Get the number of bits set in the 16-bit IRQ mask
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*/
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ACPI_MOVE_16_TO_16(&temp16, buffer);
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extra_struct_bytes = acpi_rs_count_set_bits(temp16);
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break;
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case ACPI_RESOURCE_NAME_DMA:
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/*
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* DMA Resource:
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* Get the number of bits set in the 8-bit DMA mask
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*/
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extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
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break;
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case ACPI_RESOURCE_NAME_VENDOR_SMALL:
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case ACPI_RESOURCE_NAME_VENDOR_LARGE:
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/*
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* Vendor Resource:
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* Get the number of vendor data bytes
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*/
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extra_struct_bytes = resource_length;
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break;
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case ACPI_RESOURCE_NAME_END_TAG:
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/*
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* End Tag:
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* This is the normal exit, add size of end_tag
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*/
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*size_needed += ACPI_RS_SIZE_MIN;
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return_ACPI_STATUS(AE_OK);
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case ACPI_RESOURCE_NAME_ADDRESS32:
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case ACPI_RESOURCE_NAME_ADDRESS16:
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case ACPI_RESOURCE_NAME_ADDRESS64:
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/*
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* Address Resource:
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* Add the size of the optional resource_source
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*/
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extra_struct_bytes =
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acpi_rs_stream_option_length(resource_length,
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minimum_aml_resource_length);
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break;
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case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
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/*
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* Extended IRQ Resource:
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* Using the interrupt_table_length, add 4 bytes for each additional
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* interrupt. Note: at least one interrupt is required and is
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* included in the minimum descriptor size (reason for the -1)
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*/
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extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
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/* Add the size of the optional resource_source */
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extra_struct_bytes +=
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acpi_rs_stream_option_length(resource_length -
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extra_struct_bytes,
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minimum_aml_resource_length);
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break;
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default:
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break;
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}
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/*
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* Update the required buffer size for the internal descriptor structs
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*
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* Important: Round the size up for the appropriate alignment. This
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* is a requirement on IA64.
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*/
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buffer_size = acpi_gbl_resource_struct_sizes[resource_index] +
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extra_struct_bytes;
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buffer_size = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
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*size_needed += buffer_size;
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ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
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"Type %.2X, AmlLength %.2X InternalLength %.2X\n",
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acpi_ut_get_resource_type(aml_buffer),
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acpi_ut_get_descriptor_length(aml_buffer),
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buffer_size));
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/*
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* Point to the next resource within the AML stream using the length
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* contained in the resource descriptor header
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*/
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aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
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}
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/* Did not find an end_tag resource descriptor */
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return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_get_pci_routing_table_length
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*
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* PARAMETERS: package_object - Pointer to the package object
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* buffer_size_needed - u32 pointer of the size buffer
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* needed to properly return the
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* parsed data
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*
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* RETURN: Status
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*
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* DESCRIPTION: Given a package representing a PCI routing table, this
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* calculates the size of the corresponding linked list of
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* descriptions.
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*
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******************************************************************************/
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acpi_status
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acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
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acpi_size * buffer_size_needed)
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{
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u32 number_of_elements;
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acpi_size temp_size_needed = 0;
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union acpi_operand_object **top_object_list;
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u32 index;
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union acpi_operand_object *package_element;
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union acpi_operand_object **sub_object_list;
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u8 name_found;
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u32 table_index;
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ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
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number_of_elements = package_object->package.count;
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/*
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* Calculate the size of the return buffer.
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* The base size is the number of elements * the sizes of the
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* structures. Additional space for the strings is added below.
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* The minus one is to subtract the size of the u8 Source[1]
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* member because it is added below.
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*
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* But each PRT_ENTRY structure has a pointer to a string and
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* the size of that string must be found.
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*/
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top_object_list = package_object->package.elements;
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for (index = 0; index < number_of_elements; index++) {
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/* Dereference the sub-package */
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package_element = *top_object_list;
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/* We must have a valid Package object */
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if (!package_element ||
|
|
(package_element->common.type != ACPI_TYPE_PACKAGE)) {
|
|
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
|
|
}
|
|
|
|
/*
|
|
* The sub_object_list will now point to an array of the
|
|
* four IRQ elements: Address, Pin, Source and source_index
|
|
*/
|
|
sub_object_list = package_element->package.elements;
|
|
|
|
/* Scan the irq_table_elements for the Source Name String */
|
|
|
|
name_found = FALSE;
|
|
|
|
for (table_index = 0; table_index < 4 && !name_found;
|
|
table_index++) {
|
|
if (*sub_object_list && /* Null object allowed */
|
|
((ACPI_TYPE_STRING ==
|
|
(*sub_object_list)->common.type) ||
|
|
((ACPI_TYPE_LOCAL_REFERENCE ==
|
|
(*sub_object_list)->common.type) &&
|
|
((*sub_object_list)->reference.class ==
|
|
ACPI_REFCLASS_NAME)))) {
|
|
name_found = TRUE;
|
|
} else {
|
|
/* Look at the next element */
|
|
|
|
sub_object_list++;
|
|
}
|
|
}
|
|
|
|
temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
|
|
|
|
/* Was a String type found? */
|
|
|
|
if (name_found) {
|
|
if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) {
|
|
/*
|
|
* The length String.Length field does not include the
|
|
* terminating NULL, add 1
|
|
*/
|
|
temp_size_needed += ((acpi_size)
|
|
(*sub_object_list)->string.
|
|
length + 1);
|
|
} else {
|
|
temp_size_needed +=
|
|
acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
|
|
if (!temp_size_needed) {
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* If no name was found, then this is a NULL, which is
|
|
* translated as a u32 zero.
|
|
*/
|
|
temp_size_needed += sizeof(u32);
|
|
}
|
|
|
|
/* Round up the size since each element must be aligned */
|
|
|
|
temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
|
|
|
|
/* Point to the next union acpi_operand_object */
|
|
|
|
top_object_list++;
|
|
}
|
|
|
|
/*
|
|
* Add an extra element to the end of the list, essentially a
|
|
* NULL terminator
|
|
*/
|
|
*buffer_size_needed =
|
|
temp_size_needed + sizeof(struct acpi_pci_routing_table);
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|