[RFC 09/14] efi_loader: add simple firmware management protocol for FIT image

Heinrich Schuchardt
2020-03-18T08:04:44Z

On 3/17/20 3:12 AM, AKASHI Takahiro wrote:
> In this commit, a very simple firmware management protocol driver
> is implemented. It will take a single FIT image firmware in a capsule
> and apply the data using an existing update_tftp() interface.
>
> To specify a device and location to be updated,
> CONFIG_EFI_CAPSULE_FIT_INTERFACE, and
> CONFIG_EFI_CAPSULE_FIT_DEVICE
> are used.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> ---
> include/efi_loader.h | 3 +
> lib/efi_loader/Kconfig | 24 ++++-
> lib/efi_loader/Makefile | 1 +
> lib/efi_loader/efi_firmware.c | 191 ++++++++++++++++++++++++++++++++++
> 4 files changed, 218 insertions(+), 1 deletion(-)
> create mode 100644 lib/efi_loader/efi_firmware.c
>
> diff --git a/include/efi_loader.h b/include/efi_loader.h
> index c701672e18db..79bdf9586d24 100644
> --- a/include/efi_loader.h
> +++ b/include/efi_loader.h
> @@ -134,6 +134,7 @@ extern const struct efi_hii_config_access_protocol efi_hii_config_access;
> extern const struct efi_hii_database_protocol efi_hii_database;
> extern const struct efi_hii_string_protocol efi_hii_string;
> extern const struct efi_rng_protocol efi_rng_protocol;
> +extern const struct efi_firmware_management_protocol efi_fmp_fit;
>
> uint16_t *efi_dp_str(struct efi_device_path *dp);
>
> @@ -180,6 +181,8 @@ extern const efi_guid_t efi_guid_hii_database_protocol;
> extern const efi_guid_t efi_guid_hii_string_protocol;
> /* GUID of capsule update result */
> extern const efi_guid_t efi_guid_capsule_report;
> +/* GUID of firmware management protocol */
> +extern const efi_guid_t efi_guid_firmware_management_protocol;
>
> /* GUID of RNG protocol */
> extern const efi_guid_t efi_guid_rng_protocol;
> diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> index 43d6f75d557a..41b1e9b5543c 100644
> --- a/lib/efi_loader/Kconfig
> +++ b/lib/efi_loader/Kconfig
> @@ -97,7 +97,6 @@ config EFI_CAPSULE_UPDATE
> Select this option if you want to use capsule update feature,
> including firmware updates and variable updates.
>
> -
> if EFI_CAPSULE_UPDATE
>
> config EFI_CAPSULE_UPDATE_FIRMWARE
> @@ -107,6 +106,29 @@ config EFI_CAPSULE_UPDATE_FIRMWARE
> Select this option if you want to enable capsule-based
> firmware update
>
> +config EFI_CAPSULE_FIT_SIMPLE
> + bool "Firmware management protocol for simple FIT image"
> + depends on EFI_CAPSULE_UPDATE_FIRMWARE
> + depends on FIT
> + select UPDATE_TFTP

UPDATE_TFTP is a very unsecure setting. A rogue DHCP and tFTP server can
be used to compromise a device where this is enabled.

Why should we need to enable an insecure network protocol to have
capsule updates?

Best regards

Heinrich

> + select DFU
> + default n
> + help
> + Select this option if you want to enable firmware management protocol
> + for simple FIT image
> +
> +config EFI_CAPSULE_FIT_INTERFACE
> + string "Storage interface for storing FIT image"
> + depends on EFI_CAPSULE_FIT_SIMPLE
> + help
> + Define storage interface for storing FIT image
> +
> +config EFI_CAPSULE_FIT_DEVICE
> + string "Storage device for storing FIT image"
> + depends on EFI_CAPSULE_FIT_SIMPLE
> + help
> + Define storage device for storing FIT image
> +
> endif
>
> config EFI_CAPSULE_ON_DISK
> diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
> index f19096924bef..50da10e0e3d9 100644
> --- a/lib/efi_loader/Makefile
> +++ b/lib/efi_loader/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o
> obj-y += efi_bootmgr.o
> obj-y += efi_boottime.o
> obj-$(CONFIG_EFI_CAPSULE_UPDATE) += efi_capsule.o
> +obj-$(CONFIG_EFI_CAPSULE_FIT_SIMPLE) += efi_firmware.o
> obj-y += efi_console.o
> obj-y += efi_device_path.o
> obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_device_path_to_text.o
> diff --git a/lib/efi_loader/efi_firmware.c b/lib/efi_loader/efi_firmware.c
> new file mode 100644
> index 000000000000..021c93196242
> --- /dev/null
> +++ b/lib/efi_loader/efi_firmware.c
> @@ -0,0 +1,191 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * EFI Firmware management protocol for FIT image
> + *
> + * Copyright (c) 2018 Linaro Limited
> + * Author: AKASHI Takahiro
> + */
> +
> +#include <common.h>
> +#include <efi_loader.h>
> +#include <net.h>
> +
> +/*
> + * This FIMRWARE_MANAGEMENT_PROTOCOL driver provides a simple
> + * firmware update method, and handles
> + * - a single region 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;
> +
> +static
> +efi_status_t EFIAPI efi_fmp_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_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 < sizeof(*image_info)) {
> + *image_info_size = sizeof(*image_info);
> + return EFI_EXIT(EFI_BUFFER_TOO_SMALL);
> + }
> +
> + if (!image_info)
> + return EFI_EXIT(EFI_INVALID_PARAMETER);
> +
> + *image_info_size = sizeof(*image_info);
> + if (descriptor_version)
> + *descriptor_version = EFI_FIRMWARE_IMAGE_DESCRIPTOR_VERSION;
> + if (descriptor_count)
> + *descriptor_count = 1;
> + if (descriptor_size)
> + *descriptor_size = sizeof(*image_info);
> + if (package_version)
> + *package_version = 0xffffffff; /* not supported */
> + if (package_version_name)
> + *package_version_name = NULL; /* not supported */
> +
> + image_info[0].image_index = 1;
> + image_info[0].image_type_id = efi_firmware_image_type_uboot_fit;
> + image_info[0].image_id = 0;
> + image_info[0].image_id_name = L"fw_simple";
> + image_info[0].version = 0; /* not supported */
> + image_info[0].version_name = NULL; /* not supported */
> + image_info[0].size = 0;
> +#if defined(CONFIG_FIT) && defined(CONFIG_UPDATE_TFTP)
> + image_info[0].attributes_supported =
> + EFI_IMAGE_ATTRIBUTE_IMAGE_UPDATABLE;
> + image_info[0].attributes_setting = EFI_IMAGE_ATTRIBUTE_IMAGE_UPDATABLE;
> +#else
> + image_info[0].attributes_supported = 0;
> + image_info[0].attributes_setting = 0;
> +#endif
> + image_info[0].lowest_supported_image_version = 0;
> + image_info[0].last_attempt_version = 0;
> + image_info[0].last_attempt_status = LAST_ATTEMPT_STATUS_SUCCESS;
> + image_info[0].hardware_instance = 1;
> + image_info[0].dependencies = NULL;
> +
> + return EFI_EXIT(ret);
> +}
> +
> +static
> +efi_status_t EFIAPI efi_fmp_fit_get_image(
> + 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);
> +}
> +
> +static
> +efi_status_t EFIAPI efi_fmp_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 %ld %p %p %p\n", this, image_index, image,
> + image_size, vendor_code, progress, abort_reason);
> +
> +#if defined(CONFIG_FIT) && defined(CONFIG_UPDATE_TFTP)
> + if (!image || image_index != 1)
> + return EFI_EXIT(EFI_INVALID_PARAMETER);
> +
> + if (update_tftp((ulong)image, CONFIG_EFI_CAPSULE_FIT_INTERFACE,
> + CONFIG_EFI_CAPSULE_FIT_DEVICE))
> + return EFI_EXIT(EFI_DEVICE_ERROR);
> +
> + return EFI_EXIT(EFI_SUCCESS);
> +#else
> + return EFI_EXIT(EFI_UNSUPPORTED);
> +#endif
> +}
> +
> +static
> +efi_status_t EFIAPI efi_fmp_fit_check_image(
> + 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);
> +}
> +
> +static
> +efi_status_t EFIAPI efi_fmp_fit_get_package_info(
> + 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);
> +}
> +
> +static
> +efi_status_t EFIAPI efi_fmp_fit_set_package_info(
> + 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);
> +}
> +
> +const struct efi_firmware_management_protocol efi_fmp_fit_simple = {
> + .get_image_info = efi_fmp_fit_get_image_info,
> + .get_image = efi_fmp_fit_get_image,
> + .set_image = efi_fmp_fit_set_image,
> + .check_image = efi_fmp_fit_check_image,
> + .get_package_info = efi_fmp_fit_get_package_info,
> + .set_package_info = efi_fmp_fit_set_package_info,
> +};
> +
> +efi_status_t arch_efi_load_capsule_drivers(void)
> +{
> + efi_status_t ret;
> +
> + ret = EFI_CALL(efi_install_multiple_protocol_interfaces(
> + &efi_root, &efi_guid_firmware_management_protocol,
> + &efi_fmp_fit_simple, NULL));
> +
> + return ret;
> +}
>