466 lines
14 KiB
C
466 lines
14 KiB
C
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. 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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch.h>
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#include <arch_helpers.h>
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#include <assert.h>
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#include <auth.h>
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#include <bl_common.h>
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#include <debug.h>
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#include <platform.h>
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#include <platform_def.h>
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#include "bl2_private.h"
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#if TRUSTED_BOARD_BOOT
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#ifdef BL32_BASE
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static int bl32_cert_error;
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#endif
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/*
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* Load and authenticate the key and content certificates for a BL3-x image
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*
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* Parameters:
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* key_cert_blob: key certificate blob id (see auth.h)
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* key_cert_name: key certificate filename
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* cont_cert_blob: content certificate blob id (see auth.h)
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* cont_cert_name: content certificate filename
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* mem_layout: Trusted SRAM memory layout
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* load_addr: load the certificates at this address
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*
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* Return: 0 = success, Otherwise = error
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*/
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static int load_cert_bl3x(int key_cert_blob, const char *key_cert_name,
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int cont_cert_blob, const char *cont_cert_name,
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meminfo_t *mem_layout, uint64_t load_addr)
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{
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image_info_t image_info;
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int err;
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/* Load Key certificate */
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image_info.h.version = VERSION_1;
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err = load_image(mem_layout, key_cert_name, load_addr, &image_info, NULL);
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if (err) {
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ERROR("Cannot load %s.\n", key_cert_name);
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return err;
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}
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err = auth_verify_obj(key_cert_blob, image_info.image_base,
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image_info.image_size);
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if (err) {
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ERROR("Invalid key certificate %s.\n", key_cert_name);
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return err;
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}
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/* Load Content certificate */
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image_info.h.version = VERSION_1;
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err = load_image(mem_layout, cont_cert_name, load_addr, &image_info, NULL);
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if (err) {
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ERROR("Cannot load %s.\n", cont_cert_name);
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return err;
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}
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err = auth_verify_obj(cont_cert_blob, image_info.image_base,
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image_info.image_size);
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if (err) {
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ERROR("Invalid content certificate %s.\n", cont_cert_name);
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return err;
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}
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return 0;
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}
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/*
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* Load and authenticate the Trusted Key certificate the key and content
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* certificates for each of the BL3-x images.
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*
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* Return: 0 = success, Otherwise = error
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*/
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static int load_certs(void)
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{
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const uint64_t load_addr = BL31_BASE;
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image_info_t image_info;
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meminfo_t *mem_layout;
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int err;
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/* Find out how much free trusted ram remains after BL2 load */
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mem_layout = bl2_plat_sec_mem_layout();
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/* Load the Trusted Key certificate in the BL31 region */
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image_info.h.version = VERSION_1;
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err = load_image(mem_layout, TRUSTED_KEY_CERT_NAME, load_addr,
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&image_info, NULL);
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if (err) {
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ERROR("Failed to load Trusted Key certificate.\n");
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return err;
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}
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/* Validate the certificate */
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err = auth_verify_obj(AUTH_TRUSTED_KEY_CERT, image_info.image_base,
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image_info.image_size);
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if (err) {
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ERROR("Invalid Trusted Key certificate.\n");
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return err;
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}
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/* Load and validate Key and Content certificates for BL3-x images */
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#ifdef BL30_BASE
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err = load_cert_bl3x(AUTH_BL30_KEY_CERT, BL30_KEY_CERT_NAME,
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AUTH_BL30_IMG_CERT, BL30_CERT_NAME,
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mem_layout, load_addr);
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if (err) {
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ERROR("Failed to verify BL3-0 authenticity\n");
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return err;
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}
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#endif /* BL30_BASE */
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err = load_cert_bl3x(AUTH_BL31_KEY_CERT, BL31_KEY_CERT_NAME,
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AUTH_BL31_IMG_CERT, BL31_CERT_NAME,
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mem_layout, load_addr);
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if (err) {
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ERROR("Failed to verify BL3-1 authenticity\n");
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return err;
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}
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#ifdef BL32_BASE
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/* BL3-2 image is optional, but keep the return value in case the
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* image is present but the certificate is missing */
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err = load_cert_bl3x(AUTH_BL32_KEY_CERT, BL32_KEY_CERT_NAME,
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AUTH_BL32_IMG_CERT, BL32_CERT_NAME,
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mem_layout, load_addr);
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if (err) {
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WARN("Failed to verify BL3-2 authenticity\n");
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}
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bl32_cert_error = err;
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#endif /* BL32_BASE */
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err = load_cert_bl3x(AUTH_BL33_KEY_CERT, BL33_KEY_CERT_NAME,
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AUTH_BL33_IMG_CERT, BL33_CERT_NAME,
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mem_layout, load_addr);
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if (err) {
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ERROR("Failed to verify BL3-3 authenticity\n");
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return err;
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}
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return 0;
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}
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#endif /* TRUSTED_BOARD_BOOT */
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/*******************************************************************************
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* Load the BL3-0 image if there's one.
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* If a platform does not want to attempt to load BL3-0 image it must leave
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* BL30_BASE undefined.
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* Return 0 on success or if there's no BL3-0 image to load, a negative error
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* code otherwise.
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******************************************************************************/
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static int load_bl30(void)
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{
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int e = 0;
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#ifdef BL30_BASE
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meminfo_t bl30_mem_info;
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image_info_t bl30_image_info;
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/*
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* It is up to the platform to specify where BL3-0 should be loaded if
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* it exists. It could create space in the secure sram or point to a
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* completely different memory.
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*
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* The entry point information is not relevant in this case as the AP
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* won't execute the BL3-0 image.
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*/
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INFO("BL2: Loading BL3-0\n");
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bl2_plat_get_bl30_meminfo(&bl30_mem_info);
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bl30_image_info.h.version = VERSION_1;
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e = load_image(&bl30_mem_info,
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BL30_IMAGE_NAME,
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BL30_BASE,
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&bl30_image_info,
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NULL);
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if (e)
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return e;
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#if TRUSTED_BOARD_BOOT
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e = auth_verify_obj(AUTH_BL30_IMG,
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bl30_image_info.image_base,
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bl30_image_info.image_size);
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if (e) {
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ERROR("Failed to authenticate BL3-0 image.\n");
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return e;
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}
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/* After working with data, invalidate the data cache */
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inv_dcache_range(bl30_image_info.image_base,
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(size_t)bl30_image_info.image_size);
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#endif /* TRUSTED_BOARD_BOOT */
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/* The subsequent handling of BL3-0 is platform specific */
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e = bl2_plat_handle_bl30(&bl30_image_info);
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if (e) {
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ERROR("Failure in platform-specific handling of BL3-0 image.\n");
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return e;
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}
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#endif /* BL30_BASE */
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return e;
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}
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/*******************************************************************************
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* Load the BL3-1 image.
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* The bl2_to_bl31_params and bl31_ep_info params will be updated with the
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* relevant BL3-1 information.
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* Return 0 on success, a negative error code otherwise.
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******************************************************************************/
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static int load_bl31(bl31_params_t *bl2_to_bl31_params,
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entry_point_info_t *bl31_ep_info)
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{
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meminfo_t *bl2_tzram_layout;
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int e;
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INFO("BL2: Loading BL3-1\n");
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assert(bl2_to_bl31_params != NULL);
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assert(bl31_ep_info != NULL);
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/* Find out how much free trusted ram remains after BL2 load */
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bl2_tzram_layout = bl2_plat_sec_mem_layout();
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/* Set the X0 parameter to BL3-1 */
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bl31_ep_info->args.arg0 = (unsigned long)bl2_to_bl31_params;
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/* Load the BL3-1 image */
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e = load_image(bl2_tzram_layout,
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BL31_IMAGE_NAME,
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BL31_BASE,
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bl2_to_bl31_params->bl31_image_info,
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bl31_ep_info);
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if (e)
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return e;
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#if TRUSTED_BOARD_BOOT
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e = auth_verify_obj(AUTH_BL31_IMG,
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bl2_to_bl31_params->bl31_image_info->image_base,
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bl2_to_bl31_params->bl31_image_info->image_size);
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if (e) {
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ERROR("Failed to authenticate BL3-1 image.\n");
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return e;
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}
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/* After working with data, invalidate the data cache */
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inv_dcache_range(bl2_to_bl31_params->bl31_image_info->image_base,
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(size_t)bl2_to_bl31_params->bl31_image_info->image_size);
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#endif /* TRUSTED_BOARD_BOOT */
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bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info,
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bl31_ep_info);
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return e;
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}
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/*******************************************************************************
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* Load the BL3-2 image if there's one.
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* The bl2_to_bl31_params param will be updated with the relevant BL3-2
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* information.
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* If a platform does not want to attempt to load BL3-2 image it must leave
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* BL32_BASE undefined.
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* Return 0 on success or if there's no BL3-2 image to load, a negative error
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* code otherwise.
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******************************************************************************/
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static int load_bl32(bl31_params_t *bl2_to_bl31_params)
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{
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int e = 0;
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#ifdef BL32_BASE
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meminfo_t bl32_mem_info;
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INFO("BL2: Loading BL3-2\n");
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assert(bl2_to_bl31_params != NULL);
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/*
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* It is up to the platform to specify where BL3-2 should be loaded if
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* it exists. It could create space in the secure sram or point to a
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* completely different memory.
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*/
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bl2_plat_get_bl32_meminfo(&bl32_mem_info);
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e = load_image(&bl32_mem_info,
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BL32_IMAGE_NAME,
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BL32_BASE,
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bl2_to_bl31_params->bl32_image_info,
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bl2_to_bl31_params->bl32_ep_info);
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if (e)
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return e;
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#if TRUSTED_BOARD_BOOT
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/* Image is present. Check if there is a valid certificate */
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if (bl32_cert_error) {
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ERROR("Failed to authenticate BL3-2 certificates.\n");
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return bl32_cert_error;
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}
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e = auth_verify_obj(AUTH_BL32_IMG,
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bl2_to_bl31_params->bl32_image_info->image_base,
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bl2_to_bl31_params->bl32_image_info->image_size);
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if (e) {
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ERROR("Failed to authenticate BL3-2 image.\n");
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return e;
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}
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/* After working with data, invalidate the data cache */
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inv_dcache_range(bl2_to_bl31_params->bl32_image_info->image_base,
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(size_t)bl2_to_bl31_params->bl32_image_info->image_size);
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#endif /* TRUSTED_BOARD_BOOT */
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bl2_plat_set_bl32_ep_info(
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bl2_to_bl31_params->bl32_image_info,
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bl2_to_bl31_params->bl32_ep_info);
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#endif /* BL32_BASE */
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return e;
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}
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/*******************************************************************************
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* Load the BL3-3 image.
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* The bl2_to_bl31_params param will be updated with the relevant BL3-3
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* information.
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* Return 0 on success, a negative error code otherwise.
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******************************************************************************/
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static int load_bl33(bl31_params_t *bl2_to_bl31_params)
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{
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meminfo_t bl33_mem_info;
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int e;
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INFO("BL2: Loading BL3-3\n");
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assert(bl2_to_bl31_params != NULL);
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bl2_plat_get_bl33_meminfo(&bl33_mem_info);
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/* Load the BL3-3 image in non-secure memory provided by the platform */
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e = load_image(&bl33_mem_info,
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BL33_IMAGE_NAME,
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plat_get_ns_image_entrypoint(),
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bl2_to_bl31_params->bl33_image_info,
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bl2_to_bl31_params->bl33_ep_info);
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if (e)
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return e;
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#if TRUSTED_BOARD_BOOT
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e = auth_verify_obj(AUTH_BL33_IMG,
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bl2_to_bl31_params->bl33_image_info->image_base,
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bl2_to_bl31_params->bl33_image_info->image_size);
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if (e) {
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ERROR("Failed to authenticate BL3-3 image.\n");
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return e;
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}
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/* After working with data, invalidate the data cache */
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inv_dcache_range(bl2_to_bl31_params->bl33_image_info->image_base,
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(size_t)bl2_to_bl31_params->bl33_image_info->image_size);
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#endif /* TRUSTED_BOARD_BOOT */
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bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info,
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bl2_to_bl31_params->bl33_ep_info);
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return e;
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}
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/*******************************************************************************
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* The only thing to do in BL2 is to load further images and pass control to
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* BL3-1. The memory occupied by BL2 will be reclaimed by BL3-x stages. BL2 runs
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* entirely in S-EL1.
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******************************************************************************/
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void bl2_main(void)
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{
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bl31_params_t *bl2_to_bl31_params;
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entry_point_info_t *bl31_ep_info;
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int e;
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NOTICE("BL2: %s\n", version_string);
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NOTICE("BL2: %s\n", build_message);
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/* Perform remaining generic architectural setup in S-EL1 */
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bl2_arch_setup();
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#if TRUSTED_BOARD_BOOT
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/* Initialize authentication module */
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auth_init();
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/* Validate the certificates involved in the Chain of Trust */
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e = load_certs();
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if (e) {
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ERROR("Chain of Trust invalid. Aborting...\n");
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panic();
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}
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#endif /* TRUSTED_BOARD_BOOT */
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/*
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* Load the subsequent bootloader images
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*/
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e = load_bl30();
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if (e) {
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ERROR("Failed to load BL3-0 (%i)\n", e);
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panic();
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}
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/* Perform platform setup in BL2 after loading BL3-0 */
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bl2_platform_setup();
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/*
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* Get a pointer to the memory the platform has set aside to pass
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* information to BL3-1.
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*/
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bl2_to_bl31_params = bl2_plat_get_bl31_params();
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bl31_ep_info = bl2_plat_get_bl31_ep_info();
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e = load_bl31(bl2_to_bl31_params, bl31_ep_info);
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if (e) {
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ERROR("Failed to load BL3-1 (%i)\n", e);
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panic();
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}
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e = load_bl32(bl2_to_bl31_params);
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if (e)
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WARN("Failed to load BL3-2 (%i)\n", e);
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e = load_bl33(bl2_to_bl31_params);
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if (e) {
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ERROR("Failed to load BL3-3 (%i)\n", e);
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panic();
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}
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/* Flush the params to be passed to memory */
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bl2_plat_flush_bl31_params();
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/*
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* Run BL3-1 via an SMC to BL1. Information on how to pass control to
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* the BL3-2 (if present) and BL3-3 software images will be passed to
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* BL3-1 as an argument.
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*/
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smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0);
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}
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