// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2018-2019, Intel Corporation. */
#include <linux/unaligned.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pldmfw.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include "pldmfw_private.h"
/* Internal structure used to store details about the PLDM image file as it is
* being validated and processed.
*/
struct pldmfw_priv {
struct pldmfw *context;
const struct firmware *fw;
/* current offset of firmware image */
size_t offset;
struct list_head records;
struct list_head components;
/* PLDM Firmware Package Header */
const struct __pldm_header *header;
u16 total_header_size;
/* length of the component bitmap */
u16 component_bitmap_len;
u16 bitmap_size;
/* Start of the component image information */
u16 component_count;
const u8 *component_start;
/* Start pf the firmware device id records */
const u8 *record_start;
u8 record_count;
/* The CRC at the end of the package header */
u32 header_crc;
struct pldmfw_record *matching_record;
};
/**
* pldm_check_fw_space - Verify that the firmware image has space left
* @data: pointer to private data
* @offset: offset to start from
* @length: length to check for
*
* Verify that the firmware data can hold a chunk of bytes with the specified
* offset and length.
*
* Returns: zero on success, or -EFAULT if the image does not have enough
* space left to fit the expected length.
*/
static int
pldm_check_fw_space(struct pldmfw_priv *data, size_t offset, size_t length)
{
size_t expected_size = offset + length;
struct device *dev = data->context->dev;
if (data->fw->size < expected_size) {
dev_dbg(dev, "Firmware file size smaller than expected. Got %zu bytes, needed %zu bytes\n",
data->fw->size, expected_size);
return -EFAULT;
}
return 0;
}
/**
* pldm_move_fw_offset - Move the current firmware offset forward
* @data: pointer to private data
* @bytes_to_move: number of bytes to move the offset forward by
*
* Check that there is enough space past the current offset, and then move the
* offset forward by this amount.
*
* Returns: zero on success, or -EFAULT if the image is too small to fit the
* expected length.
*/
static int
pldm_move_fw_offset(struct pldmfw_priv *data, size_t bytes_to_move)
{
int err;
err = pldm_check_fw_space(data, data->offset, bytes_to_move);
if (err)
return err;
data->offset += bytes_to_move;
return 0;
}
/**
* pldm_parse_header - Validate and extract details about the PLDM header
* @data: pointer to private data
*
* Performs initial basic verification of the PLDM image, up to the first
* firmware record.
*
* This includes the following checks and extractions
*
* * Verify that the UUID at the start of the header matches the expected
* value as defined in the DSP0267 PLDM specification
* * Check that the revision is 0x01
* * Extract the total header_size and verify that the image is large enough
* to contain at least the length of this header
* * Extract the size of the component bitmap length
* * Extract a pointer to the start of the record area
*
* Returns: zero on success, or a negative error code on failure.
*/
static int pldm_parse_header(struct pldmfw_priv *data)
{
const struct __pldmfw_record_area *record_area;
struct device *dev = data->context->dev;
const struct __pldm_header *header;
size_t header_size;
int err;
err = pldm_move_fw_offset(data, sizeof(*header));
if (err)
return err;
header = (const struct __pldm_header *)data->fw->data;
data->header = header;
if (!uuid_equal(&header->id, &pldm_firmware_header_id)) {
dev_dbg(dev, "Invalid package header identifier. Expected UUID %pUB, but got %pUB\n",
&pldm_firmware_header_id, &header->id);
return -EINVAL;
}
if (header->revision != PACKAGE_HEADER_FORMAT_REVISION) {
dev_dbg(dev, "Invalid package header revision. Expected revision %u but got %u\n",
PACKAGE_HEADER_FORMAT_REVISION, header->revision);
return -EOPNOTSUPP;
}
data->total_header_size = get_unaligned_le16(&header->size);
header_size = data->total_header_size - sizeof(*header);
err = pldm_check_fw_space(data, data->offset, header_size);
if (err)
return err;
data->component_bitmap_len =
get_unaligned_le16(&header->component_bitmap_len);
if (data->component_bitmap_len % 8 != 0) {
dev_dbg(dev, "Invalid component bitmap length. The length is %u, which is not a multiple of 8\n",
data->component_bitmap_len);
return -EINVAL;
}
data->bitmap_size = data->component_bitmap_len / 8;
err = pldm_move_fw_offset(data, header->version_len);
if (err)
return err;
/* extract a pointer to the record area, which just follows the main
* PLDM header data.
*/
record_area = (const struct __pldmfw_record_area *)(data->fw->data +
data->offset);
err = pldm_move_fw_offset(data, sizeof(*record_area));
if (err)
return err;
data->record_count = record_area->record_count;
data->record_start = record_area->records;
return 0;
}
/**
* pldm_check_desc_tlv_len - Check that the length matches expectation
* @data: pointer to image details
* @type: the descriptor type
* @size: the length from the descriptor header
*
* If the descriptor type is one of the documented descriptor types according
* to the standard, verify that the provided length matches.
*
* If the type is not recognized or is VENDOR_DEFINED, return zero.
*
* Returns: zero on success, or -EINVAL if the specified size of a standard
* TLV does not match the expected value defined for that TLV.
*/
static int
pldm_check_desc_tlv_len(struct pldmfw_priv *data, u16 type, u16 size)
{
struct device *dev = data->context->dev;
u16 expected_size;
switch (type) {
case PLDM_DESC_ID_PCI_VENDOR_ID:
case PLDM_DESC_ID_PCI_DEVICE_ID:
case PLDM_DESC_ID_PCI_SUBVENDOR_ID:
case PLDM_DESC_ID_PCI_SUBDEV_ID:
expected_size = 2;
break;
case PLDM_DESC_ID_PCI_REVISION_ID:
expected_size = 1;
break;
case PLDM_DESC_ID_PNP_VENDOR_ID:
expected_size = 3;
break;
case PLDM_DESC_ID_IANA_ENTERPRISE_ID:
case PLDM_DESC_ID_ACPI_VENDOR_ID:
case PLDM_DESC_ID_PNP_PRODUCT_ID:
case PLDM_DESC_ID_ACPI_PRODUCT_ID:
expected_size = 4;
break;
case PLDM_DESC_ID_UUID:
expected_size = 16;
break;
case PLDM_DESC_ID_VENDOR_DEFINED:
return 0;
default:
/* Do not report an error on an unexpected TLV */
dev_dbg(dev, "Found unrecognized TLV type 0x%04x\n", type);
return 0;
}
if (size != expected_size) {
dev_dbg(dev, "Found TLV type 0x%04x with unexpected length. Got %u bytes, but expected %u bytes\n",
type, size, expected_size);
return -EINVAL;
}
return 0;
}
/**
* pldm_parse_desc_tlvs - Check and skip past a number of TLVs
* @data: pointer to private data
* @record: pointer to the record this TLV belongs too
* @desc_count: descriptor count
*
* From the current offset, read and extract the descriptor TLVs, updating the
* current offset each time.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int
pldm_parse_desc_tlvs(struct pldmfw_priv *data, struct pldmfw_record *record, u8 desc_count)
{
const struct __pldmfw_desc_tlv *__desc;
const u8 *desc_start;
u8 i;
desc_start = data->fw->data + data->offset;
pldm_for_each_desc_tlv(i, __desc, desc_start, desc_count) {
struct pldmfw_desc_tlv *desc;
int err;
u16 type, size;
err = pldm_move_fw_offset(data, sizeof(*__desc));
if (err)
return err;
type = get_unaligned_le16(&__desc->type);
/* According to DSP0267, this only includes the data field */
size = get_unaligned_le16(&__desc->size);
err = pldm_check_desc_tlv_len(data, type, size);
if (err)
return err;
/* check that we have space and move the offset forward */
err = pldm_move_fw_offset(data, size);
if (err)
return err;
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
desc->type = type;
desc->size = size;
desc->data = __desc->data;
list_add_tail(&desc->entry, &record->descs);
}
return 0;
}
/**
* pldm_parse_one_record - Verify size of one PLDM record
* @data: pointer to image details
* @__record: pointer to the record to check
*
* This function checks that the record size does not exceed either the size
* of the firmware file or the total length specified in the header section.
*
* It also verifies that the recorded length of the start of the record
* matches the size calculated by adding the static structure length, the
* component bitmap length, the version string length, the length of all
* descriptor TLVs, and the length of the package data.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int
pldm_parse_one_record(struct pldmfw_priv *data,
const struct __pldmfw_record_info *__record)
{
struct pldmfw_record *record;
size_t measured_length;
int err;
const u8 *bitmap_ptr;
u16 record_len;
int i;
/* Make a copy and insert it into the record list */
record = kzalloc(sizeof(*record), GFP_KERNEL);
if (!record)
return -ENOMEM;
INIT_LIST_HEAD(&record->descs);
list_add_tail(&record->entry, &data->records);
/* Then check that we have space and move the offset */
err = pldm_move_fw_offset(data, sizeof(*__record));
if (err)
return err;
record_len = get_unaligned_le16(&__record->record_len);
record->package_data_len = get_unaligned_le16(&__record->package_data_len);
record->version_len = __record->version_len;
record->version_type = __record->version_type;
bitmap_ptr = data->fw->data + data->offset;
/* check that we have space for the component bitmap length */
err = pldm_move_fw_offset(data, data->bitmap_size);
if (err)
return err;
record->component_bitmap_len = data->component_bitmap_len;
record->component_bitmap = bitmap_zalloc(record->component_bitmap_len,
GFP_KERNEL);
if (!record->component_bitmap)
return -ENOMEM;
for (i = 0; i < data->bitmap_size; i++)
bitmap_set_value8(record->component_bitmap, bitmap_ptr[i], i * 8);
record->version_string = data->fw->data + data->offset;
err = pldm_move_fw_offset(data, record->version_len);
if (err)
return err;
/* Scan through the descriptor TLVs and find the end */
err = pldm_parse_desc_tlvs(data, record, __record->descriptor_count);
if (err)
return err;
record->package_data = data->fw->data + data->offset;
err = pldm_move_fw_offset(data, record->package_data_len);
if (err)
return err;
measured_length = data->offset - ((const u8 *)__record - data->fw->data);
if (measured_length != record_len) {
dev_dbg(data->context->dev, "Unexpected record length. Measured record length is %zu bytes, expected length is %u bytes\n",
measured_length, record_len);
return -EFAULT;
}
return 0;
}
/**
* pldm_parse_records - Locate the start of the component area
* @data: pointer to private data
*
* Extract the record count, and loop through each record, searching for the
* component area.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int pldm_parse_records(struct pldmfw_priv *data)
{
const struct __pldmfw_component_area *component_area;
const struct __pldmfw_record_info *record;
int err;
u8 i;
pldm_for_each_record(i, record, data->record_start, data->record_count) {
err = pldm_parse_one_record(data, record);
if (err)
return err;
}
/* Extract a pointer to the component area, which just follows the
* PLDM device record data.
*/
component_area = (const struct __pldmfw_component_area *)(data->fw->data + data->offset);
err = pldm_move_fw_offset(data, sizeof(*component_area));
if (err)
return err;
data->component_count =
get_unaligned_le16(&component_area->component_image_count);
data->component_start = component_area->components;
return 0;
}
/**
* pldm_parse_components - Locate the CRC header checksum
* @data: pointer to private data
*
* Extract the component count, and find the pointer to the component area.
* Scan through each component searching for the end, which should point to
* the package header checksum.
*
* Extract the package header CRC and save it for verification.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int pldm_parse_components(struct pldmfw_priv *data)
{
const struct __pldmfw_component_info *__component;
struct device *dev = data->context->dev;
const u8 *header_crc_ptr;
int err;
u8 i;
pldm_for_each_component(i, __component, data->component_start, data->component_count) {
struct pldmfw_component *component;
u32 offset, size;
err = pldm_move_fw_offset(data, sizeof(*__component));
if (err)
return err;
err = pldm_move_fw_offset(data, __component->version_len);
if (err)
return err;
offset = get_unaligned_le32(&__component->location_offset);
size = get_unaligned_le32(&__component->size);
err = pldm_check_fw_space(data, offset, size);
if (err)
return err;
component = kzalloc(sizeof(*component), GFP_KERNEL);
if (!component)
return -ENOMEM;
component->index = i;
component->classification = get_unaligned_le16(&__component->classification);
component->identifier = get_unaligned_le16(&__component->identifier);
component->comparison_stamp = get_unaligned_le32(&__component->comparison_stamp);
component->options = get_unaligned_le16(&__component->options);
component->activation_method = get_unaligned_le16(&__component->activation_method);
component->version_type = __component->version_type;
component->version_len = __component->version_len;
component->version_string = __component->version_string;
component->component_data = data->fw->data + offset;
component->component_size = size;
list_add_tail(&component->entry, &data->components);
}
header_crc_ptr = data->fw->data + data->offset;
err = pldm_move_fw_offset(data, sizeof(data->header_crc));
if (err)
return err;
/* Make sure that we reached the expected offset */
if (data->offset != data->total_header_size) {
dev_dbg(dev, "Invalid firmware header size. Expected %u but got %zu\n",
data->total_header_size, data->offset);
return -EFAULT;
}
data->header_crc = get_unaligned_le32(header_crc_ptr);
return 0;
}
/**
* pldm_verify_header_crc - Verify that the CRC in the header matches
* @data: pointer to private data
*
* Calculates the 32-bit CRC using the standard IEEE 802.3 CRC polynomial and
* compares it to the value stored in the header.
*
* Returns: zero on success if the CRC matches, or -EBADMSG on an invalid CRC.
*/
static int pldm_verify_header_crc(struct pldmfw_priv *data)
{
struct device *dev = data->context->dev;
u32 calculated_crc;
size_t length;
/* Calculate the 32-bit CRC of the header header contents up to but
* not including the checksum. Note that the Linux crc32_le function
* does not perform an expected final XOR.
*/
length = data->offset - sizeof(data->header_crc);
calculated_crc = crc32_le(~0, data->fw->data, length) ^ ~0;
if (calculated_crc != data->header_crc) {
dev_dbg(dev, "Invalid CRC in firmware header. Got 0x%08x but expected 0x%08x\n",
calculated_crc, data->header_crc);
return -EBADMSG;
}
return 0;
}
/**
* pldmfw_free_priv - Free memory allocated while parsing the PLDM image
* @data: pointer to the PLDM data structure
*
* Loops through and clears all allocated memory associated with each
* allocated descriptor, record, and component.
*/
static void pldmfw_free_priv(struct pldmfw_priv *data)
{
struct pldmfw_component *component, *c_safe;
struct pldmfw_record *record, *r_safe;
struct pldmfw_desc_tlv *desc, *d_safe;
list_for_each_entry_safe(component, c_safe, &data->components, entry) {
list_del(&component->entry);
kfree(component);
}
list_for_each_entry_safe(record, r_safe, &data->records, entry) {
list_for_each_entry_safe(desc, d_safe, &record->descs, entry) {
list_del(&desc->entry);
kfree(desc);
}
if (record->component_bitmap) {
bitmap_free(record->component_bitmap);
record->component_bitmap = NULL;
}
list_del(&record->entry);
kfree(record);
}
}
/**
* pldm_parse_image - parse and extract details from PLDM image
* @data: pointer to private data
*
* Verify that the firmware file contains valid data for a PLDM firmware
* file. Extract useful pointers and data from the firmware file and store
* them in the data structure.
*
* The PLDM firmware file format is defined in DMTF DSP0267 1.0.0. Care
* should be taken to use get_unaligned_le* when accessing data from the
* pointers in data.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int pldm_parse_image(struct pldmfw_priv *data)
{
int err;
if (WARN_ON(!(data->context->dev && data->fw->data && data->fw->size)))
return -EINVAL;
err = pldm_parse_header(data);
if (err)
return err;
err = pldm_parse_records(data);
if (err)
return err;
err = pldm_parse_components(data);
if (err)
return err;
return pldm_verify_header_crc(data);
}
/* these are u32 so that we can store PCI_ANY_ID */
struct pldm_pci_record_id {
int vendor;
int device;
int subsystem_vendor;
int subsystem_device;
};
/**
* pldmfw_op_pci_match_record - Check if a PCI device matches the record
* @context: PLDM fw update structure
* @record: list of records extracted from the PLDM image
*
* Determine of the PCI device associated with this device matches the record
* data provided.
*
* Searches the descriptor TLVs and extracts the relevant descriptor data into
* a pldm_pci_record_id. This is then compared against the PCI device ID
* information.
*
* Returns: true if the device matches the record, false otherwise.
*/
bool pldmfw_op_pci_match_record(struct pldmfw *context, struct pldmfw_record *record)
{
struct pci_dev *pdev = to_pci_dev(context->dev);
struct pldm_pci_record_id id = {
.vendor = PCI_ANY_ID,
.device = PCI_ANY_ID,
.subsystem_vendor = PCI_ANY_ID,
.subsystem_device = PCI_ANY_ID,
};
struct pldmfw_desc_tlv *desc;
list_for_each_entry(desc, &record->descs, entry) {
u16 value;
int *ptr;
switch (desc->type) {
case PLDM_DESC_ID_PCI_VENDOR_ID:
ptr = &id.vendor;
break;
case PLDM_DESC_ID_PCI_DEVICE_ID:
ptr = &id.device;
break;
case PLDM_DESC_ID_PCI_SUBVENDOR_ID:
ptr = &id.subsystem_vendor;
break;
case PLDM_DESC_ID_PCI_SUBDEV_ID:
ptr = &id.subsystem_device;
break;
default:
/* Skip unrelated TLVs */
continue;
}
value = get_unaligned_le16(desc->data);
/* A value of zero for one of the descriptors is sometimes
* used when the record should ignore this field when matching
* device. For example if the record applies to any subsystem
* device or vendor.
*/
if (value)
*ptr = (int)value;
else
*ptr = PCI_ANY_ID;
}
if ((id.vendor == PCI_ANY_ID || id.vendor == pdev->vendor) &&
(id.device == PCI_ANY_ID || id.device == pdev->device) &&
(id.subsystem_vendor == PCI_ANY_ID || id.subsystem_vendor == pdev->subsystem_vendor) &&
(id.subsystem_device == PCI_ANY_ID || id.subsystem_device == pdev->subsystem_device))
return true;
else
return false;
}
EXPORT_SYMBOL(pldmfw_op_pci_match_record);
/**
* pldm_find_matching_record - Find the first matching PLDM record
* @data: pointer to private data
*
* Search through PLDM records and find the first matching entry. It is
* expected that only one entry matches.
*
* Store a pointer to the matching record, if found.
*
* Returns: zero on success, or -ENOENT if no matching record is found.
*/
static int pldm_find_matching_record(struct pldmfw_priv *data)
{
struct pldmfw_record *record;
list_for_each_entry(record, &data->records, entry) {
if (data->context->ops->match_record(data->context, record)) {
data->matching_record = record;
return 0;
}
}
return -ENOENT;
}
/**
* pldm_send_package_data - Send firmware the package data for the record
* @data: pointer to private data
*
* Send the package data associated with the matching record to the firmware,
* using the send_pkg_data operation.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int
pldm_send_package_data(struct pldmfw_priv *data)
{
struct pldmfw_record *record = data->matching_record;
const struct pldmfw_ops *ops = data->context->ops;
return ops->send_package_data(data->context, record->package_data,
record->package_data_len);
}
/**
* pldm_send_component_tables - Send component table information to firmware
* @data: pointer to private data
*
* Loop over each component, sending the applicable components to the firmware
* via the send_component_table operation.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int
pldm_send_component_tables(struct pldmfw_priv *data)
{
unsigned long *bitmap = data->matching_record->component_bitmap;
struct pldmfw_component *component;
int err;
list_for_each_entry(component, &data->components, entry) {
u8 index = component->index, transfer_flag = 0;
/* Skip components which are not intended for this device */
if (!test_bit(index, bitmap))
continue;
/* determine whether this is the start, middle, end, or both
* the start and end of the component tables
*/
if (index == find_first_bit(bitmap, data->component_bitmap_len))
transfer_flag |= PLDM_TRANSFER_FLAG_START;
if (index == find_last_bit(bitmap, data->component_bitmap_len))
transfer_flag |= PLDM_TRANSFER_FLAG_END;
if (!transfer_flag)
transfer_flag = PLDM_TRANSFER_FLAG_MIDDLE;
err = data->context->ops->send_component_table(data->context,
component,
transfer_flag);
if (err)
return err;
}
return 0;
}
/**
* pldm_flash_components - Program each component to device flash
* @data: pointer to private data
*
* Loop through each component that is active for the matching device record,
* and send it to the device driver for flashing.
*
* Returns: zero on success, or a negative error code on failure.
*/
static int pldm_flash_components(struct pldmfw_priv *data)
{
unsigned long *bitmap = data->matching_record->component_bitmap;
struct pldmfw_component *component;
int err;
list_for_each_entry(component, &data->components, entry) {
u8 index = component->index;
/* Skip components which are not intended for this device */
if (!test_bit(index, bitmap))
continue;
err = data->context->ops->flash_component(data->context, component);
if (err)
return err;
}
return 0;
}
/**
* pldm_finalize_update - Finalize the device flash update
* @data: pointer to private data
*
* Tell the device driver to perform any remaining logic to complete the
* device update.
*
* Returns: zero on success, or a PLFM_FWU error indicating the reason for
* failure.
*/
static int pldm_finalize_update(struct pldmfw_priv *data)
{
if (data->context->ops->finalize_update)
return data->context->ops->finalize_update(data->context);
return 0;
}
/**
* pldmfw_flash_image - Write a PLDM-formatted firmware image to the device
* @context: ops and data for firmware update
* @fw: firmware object pointing to the relevant firmware file to program
*
* Parse the data for a given firmware file, verifying that it is a valid PLDM
* formatted image that matches this device.
*
* Extract the device record Package Data and Component Tables and send them
* to the device firmware. Extract and write the flash data for each of the
* components indicated in the firmware file.
*
* Returns: zero on success, or a negative error code on failure.
*/
int pldmfw_flash_image(struct pldmfw *context, const struct firmware *fw)
{
struct pldmfw_priv *data;
int err;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
INIT_LIST_HEAD(&data->records);
INIT_LIST_HEAD(&data->components);
data->fw = fw;
data->context = context;
err = pldm_parse_image(data);
if (err)
goto out_release_data;
err = pldm_find_matching_record(data);
if (err)
goto out_release_data;
err = pldm_send_package_data(data);
if (err)
goto out_release_data;
err = pldm_send_component_tables(data);
if (err)
goto out_release_data;
err = pldm_flash_components(data);
if (err)
goto out_release_data;
err = pldm_finalize_update(data);
out_release_data:
pldmfw_free_priv(data);
kfree(data);
return err;
}
EXPORT_SYMBOL(pldmfw_flash_image);
MODULE_AUTHOR("Jacob Keller <[email protected]>");
MODULE_DESCRIPTION("PLDM firmware flash update library");
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