lib/efi_loader/efi_firmware.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * EFI Firmware management protocol
 *
 *  Copyright (c) 2020 Linaro Limited
 *			Author: AKASHI Takahiro
 */

#include <common.h>
#include <charset.h>
#include <dfu.h>
#include <efi_loader.h>
#include <image.h>
#include <signatures.h>

#include <linux/list.h>

#define FMP_PAYLOAD_HDR_SIGNATURE	SIGNATURE_32('M', 'S', 'S', '1')

/**
 * struct fmp_payload_header - EDK2 header for the FMP payload
 *
 * This structure describes the header which is preprended to the
 * FMP payload by the edk2 capsule generation scripts.
 *
 * @signature:			Header signature used to identify the header
 * @header_size:		Size of the structure
 * @fw_version:			Firmware versions used
 * @lowest_supported_version:	Lowest supported version
 */
struct fmp_payload_header {
	u32 signature;
	u32 header_size;
	u32 fw_version;
	u32 lowest_supported_version;
};

/* Place holder; not supported */
static
efi_status_t EFIAPI efi_firmware_get_image_unsupported(
	struct efi_firmware_management_protocol *this,
	u8 image_index,
	void *image,
	efi_uintn_t *image_size)
{
	EFI_ENTRY("%p %d %p %p\n", this, image_index, image, image_size);

	return EFI_EXIT(EFI_UNSUPPORTED);
}

/* Place holder; not supported */
static
efi_status_t EFIAPI efi_firmware_check_image_unsupported(
	struct efi_firmware_management_protocol *this,
	u8 image_index,
	const void *image,
	efi_uintn_t *image_size,
	u32 *image_updatable)
{
	EFI_ENTRY("%p %d %p %p %p\n", this, image_index, image, image_size,
		  image_updatable);

	return EFI_EXIT(EFI_UNSUPPORTED);
}

/* Place holder; not supported */
static
efi_status_t EFIAPI efi_firmware_get_package_info_unsupported(
	struct efi_firmware_management_protocol *this,
	u32 *package_version,
	u16 **package_version_name,
	u32 *package_version_name_maxlen,
	u64 *attributes_supported,
	u64 *attributes_setting)
{
	EFI_ENTRY("%p %p %p %p %p %p\n", this, package_version,
		  package_version_name, package_version_name_maxlen,
		  attributes_supported, attributes_setting);

	return EFI_EXIT(EFI_UNSUPPORTED);
}

/* Place holder; not supported */
static
efi_status_t EFIAPI efi_firmware_set_package_info_unsupported(
	struct efi_firmware_management_protocol *this,
	const void *image,
	efi_uintn_t *image_size,
	const void *vendor_code,
	u32 package_version,
	const u16 *package_version_name)
{
	EFI_ENTRY("%p %p %p %p %x %p\n", this, image, image_size, vendor_code,
		  package_version, package_version_name);

	return EFI_EXIT(EFI_UNSUPPORTED);
}

/**
 * efi_get_dfu_info - return information about the current firmware image
 * @this:			Protocol instance
 * @image_info_size:		Size of @image_info
 * @image_info:			Image information
 * @descriptor_version:		Pointer to version number
 * @descriptor_count:		Pointer to number of descriptors
 * @descriptor_size:		Pointer to descriptor size
 * package_version:		Package version
 * package_version_name:	Package version's name
 * image_type:			Image type GUID
 *
 * Return information bout the current firmware image in @image_info.
 * @image_info will consist of a number of descriptors.
 * Each descriptor will be created based on "dfu_alt_info" variable.
 *
 * Return		status code
 */
static efi_status_t efi_get_dfu_info(
	efi_uintn_t *image_info_size,
	struct efi_firmware_image_descriptor *image_info,
	u32 *descriptor_version,
	u8 *descriptor_count,
	efi_uintn_t *descriptor_size,
	u32 *package_version,
	u16 **package_version_name,
	const efi_guid_t *image_type)
{
	struct dfu_entity *dfu;
	size_t names_len, total_size;
	int dfu_num, i;
	u16 *name, *next;

	dfu_init_env_entities(NULL, NULL);

	names_len = 0;
	dfu_num = 0;
	list_for_each_entry(dfu, &dfu_list, list) {
		names_len += (utf8_utf16_strlen(dfu->name) + 1) * 2;
		dfu_num++;
	}
	if (!dfu_num) {
		log_warning("Probably dfu_alt_info not defined\n");
		*image_info_size = 0;
		dfu_free_entities();

		return EFI_SUCCESS;
	}

	total_size = sizeof(*image_info) * dfu_num + names_len;
	/*
	 * we will assume that sizeof(*image_info) * dfu_name
	 * is, at least, a multiple of 2. So the start address for
	 * image_id_name would be aligned with 2 bytes.
	 */
	if (*image_info_size < total_size) {
		*image_info_size = total_size;
		dfu_free_entities();

		return EFI_BUFFER_TOO_SMALL;
	}
	*image_info_size = total_size;

	*descriptor_version = EFI_FIRMWARE_IMAGE_DESCRIPTOR_VERSION;
	*descriptor_count = dfu_num;
	*descriptor_size = sizeof(*image_info);
	*package_version = 0xffffffff; /* not supported */
	*package_version_name = NULL; /* not supported */

	/* DFU alt number should correspond to image_index */
	i = 0;
	/* Name area starts just after descriptors */
	name = (u16 *)((u8 *)image_info + sizeof(*image_info) * dfu_num);
	next = name;
	list_for_each_entry(dfu, &dfu_list, list) {
		image_info[i].image_index = dfu->alt + 1;
		image_info[i].image_type_id = *image_type;
		image_info[i].image_id = dfu->alt;

		/* copy the DFU entity name */
		utf8_utf16_strcpy(&next, dfu->name);
		image_info[i].image_id_name = name;
		name = ++next;

		image_info[i].version = 0; /* not supported */
		image_info[i].version_name = NULL; /* not supported */
		image_info[i].size = 0;
		image_info[i].attributes_supported =
			IMAGE_ATTRIBUTE_IMAGE_UPDATABLE |
			IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED;
		image_info[i].attributes_setting =
				IMAGE_ATTRIBUTE_IMAGE_UPDATABLE;

		/* Check if the capsule authentication is enabled */
		if (env_get("capsule_authentication_enabled"))
			image_info[0].attributes_setting |=
				IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED;

		image_info[i].lowest_supported_image_version = 0;
		image_info[i].last_attempt_version = 0;
		image_info[i].last_attempt_status = LAST_ATTEMPT_STATUS_SUCCESS;
		image_info[i].hardware_instance = 1;
		image_info[i].dependencies = NULL;

		i++;
	}

	dfu_free_entities();

	return EFI_SUCCESS;
}

#ifdef CONFIG_EFI_CAPSULE_FIRMWARE_FIT
/*
 * This FIRMWARE_MANAGEMENT_PROTOCOL driver provides a firmware update
 * method with existing FIT image format, and handles
 *   - multiple regions of firmware via DFU
 * but doesn't support
 *   - versioning of firmware image
 *   - package information
 */
const efi_guid_t efi_firmware_image_type_uboot_fit =
	EFI_FIRMWARE_IMAGE_TYPE_UBOOT_FIT_GUID;

/**
 * efi_firmware_fit_get_image_info - return information about the current
 *				     firmware image
 * @this:			Protocol instance
 * @image_info_size:		Size of @image_info
 * @image_info:			Image information
 * @descriptor_version:		Pointer to version number
 * @descriptor_count:		Pointer to number of descriptors
 * @descriptor_size:		Pointer to descriptor size
 * package_version:		Package version
 * package_version_name:	Package version's name
 *
 * Return information bout the current firmware image in @image_info.
 * @image_info will consist of a number of descriptors.
 * Each descriptor will be created based on "dfu_alt_info" variable.
 *
 * Return		status code
 */
static
efi_status_t EFIAPI efi_firmware_fit_get_image_info(
	struct efi_firmware_management_protocol *this,
	efi_uintn_t *image_info_size,
	struct efi_firmware_image_descriptor *image_info,
	u32 *descriptor_version,
	u8 *descriptor_count,
	efi_uintn_t *descriptor_size,
	u32 *package_version,
	u16 **package_version_name)
{
	efi_status_t ret;

	EFI_ENTRY("%p %p %p %p %p %p %p %p\n", this,
		  image_info_size, image_info,
		  descriptor_version, descriptor_count, descriptor_size,
		  package_version, package_version_name);

	if (!image_info_size)
		return EFI_EXIT(EFI_INVALID_PARAMETER);

	if (*image_info_size &&
	    (!image_info || !descriptor_version || !descriptor_count ||
	     !descriptor_size || !package_version || !package_version_name))
		return EFI_EXIT(EFI_INVALID_PARAMETER);

	ret = efi_get_dfu_info(image_info_size, image_info,
			       descriptor_version, descriptor_count,
			       descriptor_size,
			       package_version, package_version_name,
			       &efi_firmware_image_type_uboot_fit);

	return EFI_EXIT(ret);
}

/**
 * efi_firmware_fit_set_image - update the firmware image
 * @this:		Protocol instance
 * @image_index:	Image index number
 * @image:		New image
 * @image_size:		Size of new image
 * @vendor_code:	Vendor-specific update policy
 * @progress:		Function to report the progress of update
 * @abort_reason:	Pointer to string of abort reason
 *
 * Update the firmware to new image, using dfu. The new image should
 * have FIT image format commonly used in U-Boot.
 * @vendor_code, @progress and @abort_reason are not supported.
 *
 * Return:		status code
 */
static
efi_status_t EFIAPI efi_firmware_fit_set_image(
	struct efi_firmware_management_protocol *this,
	u8 image_index,
	const void *image,
	efi_uintn_t image_size,
	const void *vendor_code,
	efi_status_t (*progress)(efi_uintn_t completion),
	u16 **abort_reason)
{
	EFI_ENTRY("%p %d %p %zd %p %p %p\n", this, image_index, image,
		  image_size, vendor_code, progress, abort_reason);

	if (!image || image_index != 1)
		return EFI_EXIT(EFI_INVALID_PARAMETER);

	if (fit_update(image))
		return EFI_EXIT(EFI_DEVICE_ERROR);

	return EFI_EXIT(EFI_SUCCESS);
}

const struct efi_firmware_management_protocol efi_fmp_fit = {
	.get_image_info = efi_firmware_fit_get_image_info,
	.get_image = efi_firmware_get_image_unsupported,
	.set_image = efi_firmware_fit_set_image,
	.check_image = efi_firmware_check_image_unsupported,
	.get_package_info = efi_firmware_get_package_info_unsupported,
	.set_package_info = efi_firmware_set_package_info_unsupported,
};
#endif /* CONFIG_EFI_CAPSULE_FIRMWARE_FIT */

#ifdef CONFIG_EFI_CAPSULE_FIRMWARE_RAW
/*
 * This FIRMWARE_MANAGEMENT_PROTOCOL driver provides a firmware update
 * method with raw data.
 */
const efi_guid_t efi_firmware_image_type_uboot_raw =
	EFI_FIRMWARE_IMAGE_TYPE_UBOOT_RAW_GUID;

/**
 * efi_firmware_raw_get_image_info - return information about the current
				     firmware image
 * @this:			Protocol instance
 * @image_info_size:		Size of @image_info
 * @image_info:			Image information
 * @descriptor_version:		Pointer to version number
 * @descriptor_count:		Pointer to number of descriptors
 * @descriptor_size:		Pointer to descriptor size
 * package_version:		Package version
 * package_version_name:	Package version's name
 *
 * Return information bout the current firmware image in @image_info.
 * @image_info will consist of a number of descriptors.
 * Each descriptor will be created based on "dfu_alt_info" variable.
 *
 * Return		status code
 */
static
efi_status_t EFIAPI efi_firmware_raw_get_image_info(
	struct efi_firmware_management_protocol *this,
	efi_uintn_t *image_info_size,
	struct efi_firmware_image_descriptor *image_info,
	u32 *descriptor_version,
	u8 *descriptor_count,
	efi_uintn_t *descriptor_size,
	u32 *package_version,
	u16 **package_version_name)
{
	efi_status_t ret = EFI_SUCCESS;

	EFI_ENTRY("%p %p %p %p %p %p %p %p\n", this,
		  image_info_size, image_info,
		  descriptor_version, descriptor_count, descriptor_size,
		  package_version, package_version_name);

	if (!image_info_size)
		return EFI_EXIT(EFI_INVALID_PARAMETER);

	if (*image_info_size &&
	    (!image_info || !descriptor_version || !descriptor_count ||
	     !descriptor_size || !package_version || !package_version_name))
		return EFI_EXIT(EFI_INVALID_PARAMETER);

	ret = efi_get_dfu_info(image_info_size, image_info,
			       descriptor_version, descriptor_count,
			       descriptor_size,
			       package_version, package_version_name,
			       &efi_firmware_image_type_uboot_raw);

	return EFI_EXIT(ret);
}

/**
 * efi_firmware_raw_set_image - update the firmware image
 * @this:		Protocol instance
 * @image_index:	Image index number
 * @image:		New image
 * @image_size:		Size of new image
 * @vendor_code:	Vendor-specific update policy
 * @progress:		Function to report the progress of update
 * @abort_reason:	Pointer to string of abort reason
 *
 * Update the firmware to new image, using dfu. The new image should
 * be a single raw image.
 * @vendor_code, @progress and @abort_reason are not supported.
 *
 * Return:		status code
 */
static
efi_status_t EFIAPI efi_firmware_raw_set_image(
	struct efi_firmware_management_protocol *this,
	u8 image_index,
	const void *image,
	efi_uintn_t image_size,
	const void *vendor_code,
	efi_status_t (*progress)(efi_uintn_t completion),
	u16 **abort_reason)
{
	u32 fmp_hdr_signature;
	struct fmp_payload_header *header;
	void *capsule_payload;
	efi_status_t status;
	efi_uintn_t capsule_payload_size;

	EFI_ENTRY("%p %d %p %zd %p %p %p\n", this, image_index, image,
		  image_size, vendor_code, progress, abort_reason);

	if (!image)
		return EFI_EXIT(EFI_INVALID_PARAMETER);

	/* Authenticate the capsule if authentication enabled */
	if (IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE) &&
	    env_get("capsule_authentication_enabled")) {
		capsule_payload = NULL;
		capsule_payload_size = 0;
		status = efi_capsule_authenticate(image, image_size,
						  &capsule_payload,
						  &capsule_payload_size);

		if (status == EFI_SECURITY_VIOLATION) {
			printf("Capsule authentication check failed. Aborting update\n");
			return EFI_EXIT(status);
		} else if (status != EFI_SUCCESS) {
			return EFI_EXIT(status);
		}

		debug("Capsule authentication successfull\n");
		image = capsule_payload;
		image_size = capsule_payload_size;
	} else {
		debug("Capsule authentication disabled. ");
		debug("Updating capsule without authenticating.\n");
	}

	fmp_hdr_signature = FMP_PAYLOAD_HDR_SIGNATURE;
	header = (void *)image;

	if (!memcmp(&header->signature, &fmp_hdr_signature,
		    sizeof(fmp_hdr_signature))) {
		/*
		 * When building the capsule with the scripts in
		 * edk2, a FMP header is inserted above the capsule
		 * payload. Compensate for this header to get the
		 * actual payload that is to be updated.
		 */
		image += header->header_size;
		image_size -= header->header_size;

	}

	if (dfu_write_by_alt(image_index - 1, (void *)image, image_size,
			     NULL, NULL))
		return EFI_EXIT(EFI_DEVICE_ERROR);

	return EFI_EXIT(EFI_SUCCESS);
}

const struct efi_firmware_management_protocol efi_fmp_raw = {
	.get_image_info = efi_firmware_raw_get_image_info,
	.get_image = efi_firmware_get_image_unsupported,
	.set_image = efi_firmware_raw_set_image,
	.check_image = efi_firmware_check_image_unsupported,
	.get_package_info = efi_firmware_get_package_info_unsupported,
	.set_package_info = efi_firmware_set_package_info_unsupported,
};
#endif /* CONFIG_EFI_CAPSULE_FIRMWARE_RAW */