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feat(measured_boot): image hash measurement and recording in BL1

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It looks safer and cleaner approach to record the measurement taken by
BL1 straightaway in TCG Event Log instead of deferring these recordings
to BL2.
Hence pull in the full-fledged measured boot driver into BL1 that
replaces the former ad-hoc platform interfaces i.e.
bl1_plat_set_bl2_hash, bl2_plat_get_hash.

As a result of this change the BL1 of Arm FVP platform now do the
measurements and recordings of below images:
1. FW_CONFIG
2. TB_FW_CONFIG
3. BL2

Change-Id: I798c20336308b5e91b547da4f8ed57c24d490731
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
This commit is contained in:
Manish V Badarkhe 2021-09-14 23:12:42 +01:00
parent efa6521878
commit 48ba0345f7
9 changed files with 106 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
bl1/bl1_main.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -126,6 +126,9 @@ void bl1_main(void)
auth_mod_init();
#endif /* TRUSTED_BOARD_BOOT */
/* Initialize the measured boot */
bl1_plat_mboot_init();
/* Perform platform setup in BL1. */
bl1_platform_setup();
@ -147,6 +150,9 @@ void bl1_main(void)
else
NOTICE("BL1-FWU: *******FWU Process Started*******\n");
/* Teardown the measured boot driver */
bl1_plat_mboot_finish();
bl1_prepare_next_image(image_id);
console_flush();

5
common/bl_common.c
View File

@ -203,7 +203,6 @@ static int load_auth_image_recursive(unsigned int image_id,
}
if (is_parent_image == 0) {
#if IMAGE_BL2
/*
* Measure the image.
* We do not measure its parents because these only play a role
@ -212,11 +211,11 @@ static int load_auth_image_recursive(unsigned int image_id,
* TODO: Change this code if we change our minds about measuring
* certificates.
*/
rc = plat_mboot_measure_image(image_id);
rc = plat_mboot_measure_image(image_id, image_data);
if (rc != 0) {
return rc;
}
#endif
/*
* Flush the image to main memory so that it can be executed
* later by any CPU, regardless of cache and MMU state. This

1
drivers/measured_boot/event_log/event_log.mk
View File

@ -47,3 +47,4 @@ MEASURED_BOOT_SOURCES := ${MEASURED_BOOT_SRC_DIR}event_log.c \
${MEASURED_BOOT_SRC_DIR}event_print.c
BL2_SOURCES += ${MEASURED_BOOT_SOURCES}
BL1_SOURCES += ${MEASURED_BOOT_SOURCES}

2
include/drivers/measured_boot/event_log/event_log.h
View File

@ -48,12 +48,14 @@
#define BL32_EXTRA1_IMAGE_STRING "BL32_EXTRA1_IMAGE"
#define BL32_EXTRA2_IMAGE_STRING "BL32_EXTRA2_IMAGE"
#define BL33_STRING "BL_33"
#define FW_CONFIG_STRING "FW_CONFIG"
#define GPT_IMAGE_STRING "GPT"
#define HW_CONFIG_STRING "HW_CONFIG"
#define NT_FW_CONFIG_STRING "NT_FW_CONFIG"
#define SCP_BL2_IMAGE_STRING "SCP_BL2_IMAGE"
#define SOC_FW_CONFIG_STRING "SOC_FW_CONFIG"
#define STM32_IMAGE_STRING "STM32"
#define TB_FW_CONFIG_STRING "TB_FW_CONFIG"
#define TOS_FW_CONFIG_STRING "TOS_FW_CONFIG"
typedef struct {

27
include/plat/common/platform.h
View File

@ -122,6 +122,16 @@ const char *plat_log_get_prefix(unsigned int log_level);
void bl2_plat_preload_setup(void);
int plat_try_next_boot_source(void);
#if MEASURED_BOOT
int plat_mboot_measure_image(unsigned int image_id, image_info_t *image_data);
#else
static inline int plat_mboot_measure_image(unsigned int image_id __unused,
image_info_t *image_data __unused)
{
return 0;
}
#endif /* MEASURED_BOOT */
/*******************************************************************************
* Mandatory BL1 functions
******************************************************************************/
@ -181,6 +191,18 @@ __dead2 void bl1_plat_fwu_done(void *client_cookie, void *reserved);
int bl1_plat_handle_pre_image_load(unsigned int image_id);
int bl1_plat_handle_post_image_load(unsigned int image_id);
#if MEASURED_BOOT
void bl1_plat_mboot_init(void);
void bl1_plat_mboot_finish(void);
#else
static inline void bl1_plat_mboot_init(void)
{
}
static inline void bl1_plat_mboot_finish(void)
{
}
#endif /* MEASURED_BOOT */
/*******************************************************************************
* Mandatory BL2 functions
******************************************************************************/
@ -202,7 +224,6 @@ int bl2_plat_handle_post_image_load(unsigned int image_id);
#if MEASURED_BOOT
void bl2_plat_mboot_init(void);
void bl2_plat_mboot_finish(void);
int plat_mboot_measure_image(unsigned int image_id);
#else
static inline void bl2_plat_mboot_init(void)
{
@ -210,10 +231,6 @@ static inline void bl2_plat_mboot_init(void)
static inline void bl2_plat_mboot_finish(void)
{
}
static inline int plat_mboot_measure_image(unsigned int image_id __unused)
{
return 0;
}
#endif /* MEASURED_BOOT */
/*******************************************************************************

33
plat/arm/board/fvp/fvp_bl1_measured_boot.c Normal file
View File

@ -0,0 +1,33 @@
/*
* Copyright (c) 2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdint.h>
#include <drivers/measured_boot/event_log/event_log.h>
/* Event Log data */
static uint8_t event_log[PLAT_ARM_EVENT_LOG_MAX_SIZE];
/* FVP table with platform specific image IDs, names and PCRs */
const event_log_metadata_t fvp_event_log_metadata[] = {
{ FW_CONFIG_ID, FW_CONFIG_STRING, PCR_0 },
{ TB_FW_CONFIG_ID, TB_FW_CONFIG_STRING, PCR_0 },
{ BL2_IMAGE_ID, BL2_STRING, PCR_0 },
{ INVALID_ID, NULL, (unsigned int)(-1) } /* Terminator */
};
void bl1_plat_mboot_init(void)
{
event_log_init(event_log, PLAT_ARM_EVENT_LOG_MAX_SIZE, 0U);
}
void bl1_plat_mboot_finish(void)
{
/*
* ToDo: populate tb_fw_config with Event Log address, its maximum size
* and filled size
*/
}

29
plat/arm/board/fvp/fvp_measured_boot.c → plat/arm/board/fvp/fvp_bl2_measured_boot.c
View File

@ -27,11 +27,6 @@ const event_log_metadata_t fvp_event_log_metadata[] = {
{ INVALID_ID, NULL, (unsigned int)(-1) } /* Terminator */
};
const event_log_metadata_t *plat_event_log_get_metadata(void)
{
return fvp_event_log_metadata;
}
void bl2_plat_mboot_init(void)
{
event_log_init(event_log, event_log + sizeof(event_log));
@ -88,27 +83,3 @@ void bl2_plat_mboot_finish(void)
dump_event_log(event_log, event_log_cur_size);
}
int plat_mboot_measure_image(unsigned int image_id)
{
const bl_mem_params_node_t *bl_mem_params =
get_bl_mem_params_node(image_id);
assert(bl_mem_params != NULL);
image_info_t info = bl_mem_params->image_info;
int err;
if ((info.h.attr & IMAGE_ATTRIB_SKIP_LOADING) == 0U) {
/* Calculate image hash and record data in Event Log */
err = event_log_measure_record(info.image_base,
info.image_size, image_id);
if (err != 0) {
ERROR("%s%s image id %u (%i)\n",
"BL2: Failed to ", "record", image_id, err);
return err;
}
}
return 0;
}

35
plat/arm/board/fvp/fvp_common_measured_boot.c Normal file
View File

@ -0,0 +1,35 @@
/*
* Copyright (c) 2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <stdint.h>
#include <common/desc_image_load.h>
#include <drivers/measured_boot/event_log/event_log.h>
#include <plat/arm/common/plat_arm.h>
#include <plat/common/platform.h>
extern event_log_metadata_t fvp_event_log_metadata[];
const event_log_metadata_t *plat_event_log_get_metadata(void)
{
return fvp_event_log_metadata;
}
int plat_mboot_measure_image(unsigned int image_id, image_info_t *image_data)
{
/* Calculate image hash and record data in Event Log */
int err = event_log_measure_and_record(image_data->image_base,
image_data->image_size,
image_id);
if (err != 0) {
ERROR("%s%s image id %u (%i)\n",
"Failed to ", "record", image_id, err);
return err;
}
return 0;
}

5
plat/arm/board/fvp/platform.mk
View File

@ -376,7 +376,10 @@ BL1_SOURCES += plat/arm/board/fvp/fvp_trusted_boot.c
BL2_SOURCES += plat/arm/board/fvp/fvp_trusted_boot.c
ifeq (${MEASURED_BOOT},1)
BL2_SOURCES += plat/arm/board/fvp/fvp_measured_boot.c
BL1_SOURCES += plat/arm/board/fvp/fvp_common_measured_boot.c \
plat/arm/board/fvp/fvp_bl1_measured_boot.c
BL2_SOURCES += plat/arm/board/fvp/fvp_common_measured_boot.c \
plat/arm/board/fvp/fvp_bl2_measured_boot.c
endif
# FVP being a development platform, enable capability to disable Authentication