Aaron Durbin (adurbin@chromium.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11744
-gerrit
commit 37830e40023dd0db030526015a4c482f66ca206f Author: Aaron Durbin adurbin@chromium.org Date: Tue Sep 29 17:56:59 2015 -0500
vboot: provide a unified flow for separate verstage
The vboot verification in a stage proper is unified replacing duplicate code in the tegra SoC code. The original verstage.c file is renamed to reflect its real purpose. The support for a single verstage flow is added to the vboot2 directory proper.
BUG=chrome-os-partner:44827 BRANCH=None TEST=Built glados.
Change-Id: I14593e1fc69a1654fa27b512eb4b612395b94ce5 Signed-off-by: Aaron Durbin adurbin@chromium.org --- src/mainboard/google/foster/Makefile.inc | 1 - src/mainboard/google/foster/verstage.c | 29 -- src/soc/nvidia/tegra132/include/soc/verstage.h | 2 +- src/soc/nvidia/tegra132/verstage.c | 48 --- src/soc/nvidia/tegra210/include/soc/verstage.h | 2 +- src/soc/nvidia/tegra210/verstage.c | 45 --- src/vendorcode/google/chromeos/vboot2/Makefile.inc | 3 +- src/vendorcode/google/chromeos/vboot2/misc.h | 1 - .../google/chromeos/vboot2/vboot_logic.c | 352 +++++++++++++++++++++ src/vendorcode/google/chromeos/vboot2/verstage.c | 339 ++------------------ src/vendorcode/google/chromeos/vboot_common.h | 6 + 11 files changed, 380 insertions(+), 448 deletions(-)
diff --git a/src/mainboard/google/foster/Makefile.inc b/src/mainboard/google/foster/Makefile.inc index 7b2329e..51208c7 100644 --- a/src/mainboard/google/foster/Makefile.inc +++ b/src/mainboard/google/foster/Makefile.inc @@ -32,7 +32,6 @@ bootblock-y += bootblock.c bootblock-y += pmic.c bootblock-y += reset.c
-verstage-y += verstage.c verstage-y += chromeos.c verstage-y += reset.c
diff --git a/src/mainboard/google/foster/verstage.c b/src/mainboard/google/foster/verstage.c deleted file mode 100644 index d5bcd44..0000000 --- a/src/mainboard/google/foster/verstage.c +++ /dev/null @@ -1,29 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright 2014 Google Inc. - * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc. - */ - -#include <soc/addressmap.h> -#include <soc/funitcfg.h> -#include <soc/padconfig.h> -#include <soc/verstage.h> -#include <soc/nvidia/tegra/i2c.h> - -void verstage_mainboard_init(void) -{ -} diff --git a/src/soc/nvidia/tegra132/include/soc/verstage.h b/src/soc/nvidia/tegra132/include/soc/verstage.h index df6a386..d54a111 100644 --- a/src/soc/nvidia/tegra132/include/soc/verstage.h +++ b/src/soc/nvidia/tegra132/include/soc/verstage.h @@ -20,6 +20,6 @@ #ifndef __SOC_NVIDIA_TEGRA132_SOC_VERSTAGE_H__ #define __SOC_NVIDIA_TEGRA132_SOC_VERSTAGE_H__
-void verstage_mainboard_init(void); +#include <vendorcode/google/chromeos/chromeos.h>
#endif /* __SOC_NVIDIA_TEGRA132_SOC_VERSTAGE_H__ */ diff --git a/src/soc/nvidia/tegra132/verstage.c b/src/soc/nvidia/tegra132/verstage.c deleted file mode 100644 index d6eba9a..0000000 --- a/src/soc/nvidia/tegra132/verstage.c +++ /dev/null @@ -1,48 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright 2014 Google Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc. - */ - -#include <arch/cache.h> -#include <arch/exception.h> -#include <arch/hlt.h> -#include <arch/stages.h> -#include <console/console.h> -#include <soc/verstage.h> -#include <program_loading.h> -#include <timestamp.h> - -void __attribute__((weak)) verstage_mainboard_init(void) -{ - /* Default empty implementation. */ -} - -static void verstage(void) -{ - console_init(); - timestamp_add_now(TS_START_VBOOT); - exception_init(); - verstage_mainboard_init(); - - run_romstage(); -} - -void main(void) -{ - verstage(); - hlt(); -} diff --git a/src/soc/nvidia/tegra210/include/soc/verstage.h b/src/soc/nvidia/tegra210/include/soc/verstage.h index 6c37218..d6564c9 100644 --- a/src/soc/nvidia/tegra210/include/soc/verstage.h +++ b/src/soc/nvidia/tegra210/include/soc/verstage.h @@ -20,6 +20,6 @@ #ifndef __SOC_NVIDIA_TEGRA210_SOC_VERSTAGE_H__ #define __SOC_NVIDIA_TEGRA210_SOC_VERSTAGE_H__
-void verstage_mainboard_init(void); +#include <vendorcode/google/chromeos/chromeos.h>
#endif /* __SOC_NVIDIA_TEGRA210_SOC_VERSTAGE_H__ */ diff --git a/src/soc/nvidia/tegra210/verstage.c b/src/soc/nvidia/tegra210/verstage.c deleted file mode 100644 index 6a4df29..0000000 --- a/src/soc/nvidia/tegra210/verstage.c +++ /dev/null @@ -1,45 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright 2014 Google Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc. - */ - -#include <arch/cache.h> -#include <arch/exception.h> -#include <arch/hlt.h> -#include <soc/verstage.h> -#include <console/console.h> -#include <program_loading.h> - -void __attribute__((weak)) verstage_mainboard_init(void) -{ - /* Default empty implementation. */ -} - -static void verstage(void) -{ - console_init(); - exception_init(); - verstage_mainboard_init(); - - run_romstage(); -} - -void main(void) -{ - verstage(); - hlt(); -} diff --git a/src/vendorcode/google/chromeos/vboot2/Makefile.inc b/src/vendorcode/google/chromeos/vboot2/Makefile.inc index 21613ba..c2ee868 100644 --- a/src/vendorcode/google/chromeos/vboot2/Makefile.inc +++ b/src/vendorcode/google/chromeos/vboot2/Makefile.inc @@ -31,8 +31,9 @@ romstage-y += ../vboot_common.c ramstage-y += ../vboot_common.c
bootblock-y += common.c -libverstage-y += verstage.c +libverstage-y += vboot_logic.c verstage-y += common.c +verstage-y += verstage.c ifeq (${CONFIG_VBOOT2_MOCK_SECDATA},y) libverstage-y += secdata_mock.c else diff --git a/src/vendorcode/google/chromeos/vboot2/misc.h b/src/vendorcode/google/chromeos/vboot2/misc.h index d4f9f48..305d0da 100644 --- a/src/vendorcode/google/chromeos/vboot2/misc.h +++ b/src/vendorcode/google/chromeos/vboot2/misc.h @@ -23,7 +23,6 @@ #include "../vboot_common.h"
void vboot_fill_handoff(void); -void verstage_main(void); void *vboot_load_stage(int stage_index, struct region *fw_main, struct vboot_components *fw_info); diff --git a/src/vendorcode/google/chromeos/vboot2/vboot_logic.c b/src/vendorcode/google/chromeos/vboot2/vboot_logic.c new file mode 100644 index 0000000..76355ec --- /dev/null +++ b/src/vendorcode/google/chromeos/vboot2/vboot_logic.c @@ -0,0 +1,352 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc. + */ + +#include <antirollback.h> +#include <arch/exception.h> +#include <assert.h> +#include <console/console.h> +#include <console/vtxprintf.h> +#include <delay.h> +#include <string.h> +#include <timestamp.h> +#include <vb2_api.h> + +#include "../chromeos.h" +#include "misc.h" + +#define TODO_BLOCK_SIZE 1024 + +static int is_slot_a(struct vb2_context *ctx) +{ + return !(ctx->flags & VB2_CONTEXT_FW_SLOT_B); +} + +/* exports */ + +void vb2ex_printf(const char *func, const char *fmt, ...) +{ + va_list args; + + printk(BIOS_INFO, "VB2:%s() ", func); + va_start(args, fmt); + do_printk_va_list(BIOS_INFO, fmt, args); + va_end(args); + + return; +} + +int vb2ex_tpm_clear_owner(struct vb2_context *ctx) +{ + uint32_t rv; + printk(BIOS_INFO, "Clearing TPM owner\n"); + rv = tpm_clear_and_reenable(); + if (rv) + return VB2_ERROR_EX_TPM_CLEAR_OWNER; + return VB2_SUCCESS; +} + +int vb2ex_read_resource(struct vb2_context *ctx, + enum vb2_resource_index index, + uint32_t offset, + void *buf, + uint32_t size) +{ + struct region_device rdev; + const char *name; + + switch (index) { + case VB2_RES_GBB: + name = "GBB"; + break; + case VB2_RES_FW_VBLOCK: + if (is_slot_a(ctx)) + name = "VBLOCK_A"; + else + name = "VBLOCK_B"; + break; + default: + return VB2_ERROR_EX_READ_RESOURCE_INDEX; + } + + if (vboot_named_region_device(name, &rdev)) + return VB2_ERROR_EX_READ_RESOURCE_SIZE; + + if (rdev_readat(&rdev, buf, offset, size) != size) + return VB2_ERROR_EX_READ_RESOURCE_SIZE; + + return VB2_SUCCESS; +} + +/* No-op stubs that can be overridden by SoCs with hardware crypto support. */ +__attribute__((weak)) +int vb2ex_hwcrypto_digest_init(enum vb2_hash_algorithm hash_alg, + uint32_t data_size) +{ + return VB2_ERROR_EX_HWCRYPTO_UNSUPPORTED; +} + +__attribute__((weak)) +int vb2ex_hwcrypto_digest_extend(const uint8_t *buf, uint32_t size) +{ + BUG(); /* Should never get called if init() returned an error. */ + return VB2_ERROR_UNKNOWN; +} + +__attribute__((weak)) +int vb2ex_hwcrypto_digest_finalize(uint8_t *digest, uint32_t digest_size) +{ + BUG(); /* Should never get called if init() returned an error. */ + return VB2_ERROR_UNKNOWN; +} + +static int hash_body(struct vb2_context *ctx, struct region_device *fw_main) +{ + uint64_t load_ts; + uint32_t expected_size; + uint8_t block[TODO_BLOCK_SIZE]; + size_t block_size = sizeof(block); + size_t offset; + int rv; + + /* + * Since loading the firmware and calculating its hash is intertwined, + * we use this little trick to measure them separately and pretend it + * was first loaded and then hashed in one piece with the timestamps. + * (This split won't make sense with memory-mapped media like on x86.) + */ + load_ts = timestamp_get(); + timestamp_add(TS_START_HASH_BODY, load_ts); + + expected_size = region_device_sz(fw_main); + offset = 0; + + /* Start the body hash */ + rv = vb2api_init_hash(ctx, VB2_HASH_TAG_FW_BODY, &expected_size); + if (rv) + return rv; + + /* Extend over the body */ + while (expected_size) { + uint64_t temp_ts; + if (block_size > expected_size) + block_size = expected_size; + + temp_ts = timestamp_get(); + if (rdev_readat(fw_main, block, offset, block_size) < 0) + return VB2_ERROR_UNKNOWN; + load_ts += timestamp_get() - temp_ts; + + rv = vb2api_extend_hash(ctx, block, block_size); + if (rv) + return rv; + + expected_size -= block_size; + offset += block_size; + } + + timestamp_add(TS_DONE_LOADING, load_ts); + timestamp_add_now(TS_DONE_HASHING); + + /* Check the result (with RSA signature verification) */ + rv = vb2api_check_hash(ctx); + if (rv) + return rv; + + timestamp_add_now(TS_END_HASH_BODY); + + return VB2_SUCCESS; +} + +static int locate_firmware(struct vb2_context *ctx, + struct region_device *fw_main) +{ + const char *name; + + if (is_slot_a(ctx)) + name = "FW_MAIN_A"; + else + name = "FW_MAIN_B"; + + return vboot_named_region_device(name, fw_main); +} + +/** + * Save non-volatile and/or secure data if needed. + */ +static void save_if_needed(struct vb2_context *ctx) +{ + if (ctx->flags & VB2_CONTEXT_NVDATA_CHANGED) { + printk(BIOS_INFO, "Saving nvdata\n"); + save_vbnv(ctx->nvdata); + ctx->flags &= ~VB2_CONTEXT_NVDATA_CHANGED; + } + if (ctx->flags & VB2_CONTEXT_SECDATA_CHANGED) { + printk(BIOS_INFO, "Saving secdata\n"); + antirollback_write_space_firmware(ctx); + ctx->flags &= ~VB2_CONTEXT_SECDATA_CHANGED; + } +} + +static uint32_t extend_pcrs(struct vb2_context *ctx) +{ + return tpm_extend_pcr(ctx, 0, BOOT_MODE_PCR) || + tpm_extend_pcr(ctx, 1, HWID_DIGEST_PCR); +} + +static void init_vb2_working_data(void) +{ + struct vb2_working_data *wd; + size_t work_size; + + work_size = vb2_working_data_size(); + wd = vboot_get_working_data(); + memset(wd, 0, work_size); + /* + * vboot prefers 16-byte alignment. This takes away 16 bytes + * from the VBOOT2_WORK region, but the vboot devs said that's okay. + */ + wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16); + wd->buffer_size = work_size - wd->buffer_offset; +} + +/** + * Verify and select the firmware in the RW image + * + * TODO: Avoid loading a stage twice (once in hash_body & again in load_stage). + * when per-stage verification is ready. + */ +void verstage_main(void) +{ + struct vb2_context ctx; + struct region_device fw_main; + struct vb2_working_data *wd; + int rv; + init_vb2_working_data(); + wd = vboot_get_working_data(); + timestamp_add_now(TS_START_VBOOT); + + /* Set up context and work buffer */ + memset(&ctx, 0, sizeof(ctx)); + ctx.workbuf = vboot_get_work_buffer(wd); + ctx.workbuf_size = wd->buffer_size; + + /* Read nvdata from a non-volatile storage */ + read_vbnv(ctx.nvdata); + + /* Read secdata from TPM. Initialize TPM if secdata not found. We don't + * check the return value here because vb2api_fw_phase1 will catch + * invalid secdata and tell us what to do (=reboot). */ + timestamp_add_now(TS_START_TPMINIT); + antirollback_read_space_firmware(&ctx); + timestamp_add_now(TS_END_TPMINIT); + + if (!IS_ENABLED(CONFIG_VIRTUAL_DEV_SWITCH) && + get_developer_mode_switch()) + ctx.flags |= VB2_CONTEXT_FORCE_DEVELOPER_MODE; + + if (get_recovery_mode_switch()) { + clear_recovery_mode_switch(); + ctx.flags |= VB2_CONTEXT_FORCE_RECOVERY_MODE; + if (IS_ENABLED(CONFIG_VBOOT_DISABLE_DEV_ON_RECOVERY)) + ctx.flags |= VB2_DISABLE_DEVELOPER_MODE; + } + + if (IS_ENABLED(CONFIG_WIPEOUT_SUPPORTED) && get_wipeout_mode_switch()) + ctx.flags |= VB2_CONTEXT_FORCE_WIPEOUT_MODE; + + if (IS_ENABLED(CONFIG_LID_SWITCH) && !get_lid_switch()) + ctx.flags |= VB2_CONTEXT_NOFAIL_BOOT; + + /* Do early init (set up secdata and NVRAM, load GBB) */ + printk(BIOS_INFO, "Phase 1\n"); + rv = vb2api_fw_phase1(&ctx); + + if (rv) { + /* + * If vb2api_fw_phase1 fails, check for return value. + * If it is set to VB2_ERROR_API_PHASE1_RECOVERY, then continue + * into recovery mode. + * For any other error code, save context if needed and reboot. + */ + if (rv == VB2_ERROR_API_PHASE1_RECOVERY) { + printk(BIOS_INFO, "Recovery requested (%x)\n", rv); + save_if_needed(&ctx); + extend_pcrs(&ctx); /* ignore failures */ + timestamp_add_now(TS_END_VBOOT); + return; + } + + printk(BIOS_INFO, "Reboot reqested (%x)\n", rv); + save_if_needed(&ctx); + vboot_reboot(); + } + + /* Determine which firmware slot to boot (based on NVRAM) */ + printk(BIOS_INFO, "Phase 2\n"); + rv = vb2api_fw_phase2(&ctx); + if (rv) { + printk(BIOS_INFO, "Reboot requested (%x)\n", rv); + save_if_needed(&ctx); + vboot_reboot(); + } + + /* Try that slot (verify its keyblock and preamble) */ + printk(BIOS_INFO, "Phase 3\n"); + timestamp_add_now(TS_START_VERIFY_SLOT); + rv = vb2api_fw_phase3(&ctx); + timestamp_add_now(TS_END_VERIFY_SLOT); + if (rv) { + printk(BIOS_INFO, "Reboot requested (%x)\n", rv); + save_if_needed(&ctx); + vboot_reboot(); + } + + printk(BIOS_INFO, "Phase 4\n"); + rv = locate_firmware(&ctx, &fw_main); + if (rv) + die("Failed to read FMAP to locate firmware"); + + rv = hash_body(&ctx, &fw_main); + save_if_needed(&ctx); + if (rv) { + printk(BIOS_INFO, "Reboot requested (%x)\n", rv); + vboot_reboot(); + } + + rv = extend_pcrs(&ctx); + if (rv) { + printk(BIOS_WARNING, "Failed to extend TPM PCRs (%#x)\n", rv); + vb2api_fail(&ctx, VB2_RECOVERY_RO_TPM_U_ERROR, rv); + save_if_needed(&ctx); + vboot_reboot(); + } + + /* Lock TPM */ + rv = antirollback_lock_space_firmware(); + if (rv) { + printk(BIOS_INFO, "Failed to lock TPM (%x)\n", rv); + vb2api_fail(&ctx, VB2_RECOVERY_RO_TPM_L_ERROR, 0); + save_if_needed(&ctx); + vboot_reboot(); + } + + printk(BIOS_INFO, "Slot %c is selected\n", is_slot_a(&ctx) ? 'A' : 'B'); + vb2_set_selected_region(wd, &fw_main); + timestamp_add_now(TS_END_VBOOT); +} diff --git a/src/vendorcode/google/chromeos/vboot2/verstage.c b/src/vendorcode/google/chromeos/vboot2/verstage.c index 7803d39..3938ebf 100644 --- a/src/vendorcode/google/chromeos/vboot2/verstage.c +++ b/src/vendorcode/google/chromeos/vboot2/verstage.c @@ -1,7 +1,7 @@ /* * This file is part of the coreboot project. * - * Copyright 2014 Google Inc. + * Copyright 2015 Google Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -9,7 +9,7 @@ * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License @@ -17,333 +17,30 @@ * Foundation, Inc. */
-#include <antirollback.h> #include <arch/exception.h> -#include <assert.h> +#include <arch/hlt.h> #include <console/console.h> -#include <console/vtxprintf.h> -#include <delay.h> -#include <string.h> -#include <timestamp.h> -#include <vb2_api.h> +#include <program_loading.h> +#include "../vboot_common.h"
-#include "../chromeos.h" -#include "misc.h" - -#define TODO_BLOCK_SIZE 1024 - -static int is_slot_a(struct vb2_context *ctx) -{ - return !(ctx->flags & VB2_CONTEXT_FW_SLOT_B); -} - -/* exports */ - -void vb2ex_printf(const char *func, const char *fmt, ...) +void __attribute__((weak)) verstage_mainboard_init(void) { - va_list args; - - printk(BIOS_INFO, "VB2:%s() ", func); - va_start(args, fmt); - do_printk_va_list(BIOS_INFO, fmt, args); - va_end(args); - - return; -} - -int vb2ex_tpm_clear_owner(struct vb2_context *ctx) -{ - uint32_t rv; - printk(BIOS_INFO, "Clearing TPM owner\n"); - rv = tpm_clear_and_reenable(); - if (rv) - return VB2_ERROR_EX_TPM_CLEAR_OWNER; - return VB2_SUCCESS; + /* Default empty implementation. */ }
-int vb2ex_read_resource(struct vb2_context *ctx, - enum vb2_resource_index index, - uint32_t offset, - void *buf, - uint32_t size) +void verstage(void) { - struct region_device rdev; - const char *name; - - switch (index) { - case VB2_RES_GBB: - name = "GBB"; - break; - case VB2_RES_FW_VBLOCK: - if (is_slot_a(ctx)) - name = "VBLOCK_A"; - else - name = "VBLOCK_B"; - break; - default: - return VB2_ERROR_EX_READ_RESOURCE_INDEX; - } - - if (vboot_named_region_device(name, &rdev)) - return VB2_ERROR_EX_READ_RESOURCE_SIZE; - - if (rdev_readat(&rdev, buf, offset, size) != size) - return VB2_ERROR_EX_READ_RESOURCE_SIZE; - - return VB2_SUCCESS; -} - -/* No-op stubs that can be overridden by SoCs with hardware crypto support. */ -__attribute__((weak)) -int vb2ex_hwcrypto_digest_init(enum vb2_hash_algorithm hash_alg, - uint32_t data_size) -{ - return VB2_ERROR_EX_HWCRYPTO_UNSUPPORTED; -} - -__attribute__((weak)) -int vb2ex_hwcrypto_digest_extend(const uint8_t *buf, uint32_t size) -{ - BUG(); /* Should never get called if init() returned an error. */ - return VB2_ERROR_UNKNOWN; -} - -__attribute__((weak)) -int vb2ex_hwcrypto_digest_finalize(uint8_t *digest, uint32_t digest_size) -{ - BUG(); /* Should never get called if init() returned an error. */ - return VB2_ERROR_UNKNOWN; -} - -static int hash_body(struct vb2_context *ctx, struct region_device *fw_main) -{ - uint64_t load_ts; - uint32_t expected_size; - uint8_t block[TODO_BLOCK_SIZE]; - size_t block_size = sizeof(block); - size_t offset; - int rv; - - /* - * Since loading the firmware and calculating its hash is intertwined, - * we use this little trick to measure them separately and pretend it - * was first loaded and then hashed in one piece with the timestamps. - * (This split won't make sense with memory-mapped media like on x86.) - */ - load_ts = timestamp_get(); - timestamp_add(TS_START_HASH_BODY, load_ts); - - expected_size = region_device_sz(fw_main); - offset = 0; - - /* Start the body hash */ - rv = vb2api_init_hash(ctx, VB2_HASH_TAG_FW_BODY, &expected_size); - if (rv) - return rv; - - /* Extend over the body */ - while (expected_size) { - uint64_t temp_ts; - if (block_size > expected_size) - block_size = expected_size; - - temp_ts = timestamp_get(); - if (rdev_readat(fw_main, block, offset, block_size) < 0) - return VB2_ERROR_UNKNOWN; - load_ts += timestamp_get() - temp_ts; - - rv = vb2api_extend_hash(ctx, block, block_size); - if (rv) - return rv; - - expected_size -= block_size; - offset += block_size; - } - - timestamp_add(TS_DONE_LOADING, load_ts); - timestamp_add_now(TS_DONE_HASHING); - - /* Check the result (with RSA signature verification) */ - rv = vb2api_check_hash(ctx); - if (rv) - return rv; - - timestamp_add_now(TS_END_HASH_BODY); - - return VB2_SUCCESS; -} - -static int locate_firmware(struct vb2_context *ctx, - struct region_device *fw_main) -{ - const char *name; - - if (is_slot_a(ctx)) - name = "FW_MAIN_A"; - else - name = "FW_MAIN_B"; - - return vboot_named_region_device(name, fw_main); -} - -/** - * Save non-volatile and/or secure data if needed. - */ -static void save_if_needed(struct vb2_context *ctx) -{ - if (ctx->flags & VB2_CONTEXT_NVDATA_CHANGED) { - printk(BIOS_INFO, "Saving nvdata\n"); - save_vbnv(ctx->nvdata); - ctx->flags &= ~VB2_CONTEXT_NVDATA_CHANGED; - } - if (ctx->flags & VB2_CONTEXT_SECDATA_CHANGED) { - printk(BIOS_INFO, "Saving secdata\n"); - antirollback_write_space_firmware(ctx); - ctx->flags &= ~VB2_CONTEXT_SECDATA_CHANGED; - } -} - -static uint32_t extend_pcrs(struct vb2_context *ctx) -{ - return tpm_extend_pcr(ctx, 0, BOOT_MODE_PCR) || - tpm_extend_pcr(ctx, 1, HWID_DIGEST_PCR); -} - -static void init_vb2_working_data(void) -{ - struct vb2_working_data *wd; - size_t work_size; - - work_size = vb2_working_data_size(); - wd = vboot_get_working_data(); - memset(wd, 0, work_size); - /* - * vboot prefers 16-byte alignment. This takes away 16 bytes - * from the VBOOT2_WORK region, but the vboot devs said that's okay. - */ - wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16); - wd->buffer_size = work_size - wd->buffer_offset; -} - -/** - * Verify and select the firmware in the RW image - * - * TODO: Avoid loading a stage twice (once in hash_body & again in load_stage). - * when per-stage verification is ready. - */ -void verstage_main(void) -{ - struct vb2_context ctx; - struct region_device fw_main; - struct vb2_working_data *wd; - int rv; - init_vb2_working_data(); - wd = vboot_get_working_data(); - timestamp_add_now(TS_START_VBOOT); - - /* Set up context and work buffer */ - memset(&ctx, 0, sizeof(ctx)); - ctx.workbuf = vboot_get_work_buffer(wd); - ctx.workbuf_size = wd->buffer_size; - - /* Read nvdata from a non-volatile storage */ - read_vbnv(ctx.nvdata); - - /* Read secdata from TPM. Initialize TPM if secdata not found. We don't - * check the return value here because vb2api_fw_phase1 will catch - * invalid secdata and tell us what to do (=reboot). */ - timestamp_add_now(TS_START_TPMINIT); - antirollback_read_space_firmware(&ctx); - timestamp_add_now(TS_END_TPMINIT); - - if (!IS_ENABLED(CONFIG_VIRTUAL_DEV_SWITCH) && - get_developer_mode_switch()) - ctx.flags |= VB2_CONTEXT_FORCE_DEVELOPER_MODE; - - if (get_recovery_mode_switch()) { - clear_recovery_mode_switch(); - ctx.flags |= VB2_CONTEXT_FORCE_RECOVERY_MODE; - if (IS_ENABLED(CONFIG_VBOOT_DISABLE_DEV_ON_RECOVERY)) - ctx.flags |= VB2_DISABLE_DEVELOPER_MODE; - } - - if (IS_ENABLED(CONFIG_WIPEOUT_SUPPORTED) && get_wipeout_mode_switch()) - ctx.flags |= VB2_CONTEXT_FORCE_WIPEOUT_MODE; - - if (IS_ENABLED(CONFIG_LID_SWITCH) && !get_lid_switch()) - ctx.flags |= VB2_CONTEXT_NOFAIL_BOOT; - - /* Do early init (set up secdata and NVRAM, load GBB) */ - printk(BIOS_INFO, "Phase 1\n"); - rv = vb2api_fw_phase1(&ctx); - if (rv) { - printk(BIOS_INFO, "Recovery requested (%x)\n", rv); - /* If we need recovery mode, leave firmware selection now */ - save_if_needed(&ctx); - extend_pcrs(&ctx); /* ignore failures */ - timestamp_add_now(TS_END_VBOOT); - return; - } - - /* Determine which firmware slot to boot (based on NVRAM) */ - printk(BIOS_INFO, "Phase 2\n"); - rv = vb2api_fw_phase2(&ctx); - if (rv) { - printk(BIOS_INFO, "Reboot requested (%x)\n", rv); - save_if_needed(&ctx); - vboot_reboot(); - } - - /* Try that slot (verify its keyblock and preamble) */ - printk(BIOS_INFO, "Phase 3\n"); - timestamp_add_now(TS_START_VERIFY_SLOT); - rv = vb2api_fw_phase3(&ctx); - timestamp_add_now(TS_END_VERIFY_SLOT); - if (rv) { - printk(BIOS_INFO, "Reboot requested (%x)\n", rv); - save_if_needed(&ctx); - vboot_reboot(); - } - - printk(BIOS_INFO, "Phase 4\n"); - rv = locate_firmware(&ctx, &fw_main); - if (rv) - die("Failed to read FMAP to locate firmware"); - - rv = hash_body(&ctx, &fw_main); - save_if_needed(&ctx); - if (rv) { - printk(BIOS_INFO, "Reboot requested (%x)\n", rv); - vboot_reboot(); - } - - rv = extend_pcrs(&ctx); - if (rv) { - printk(BIOS_WARNING, "Failed to extend TPM PCRs (%#x)\n", rv); - vb2api_fail(&ctx, VB2_RECOVERY_RO_TPM_U_ERROR, rv); - save_if_needed(&ctx); - vboot_reboot(); - } + console_init(); + exception_init(); + verstage_mainboard_init();
- /* Lock TPM */ - rv = antirollback_lock_space_firmware(); - if (rv) { - printk(BIOS_INFO, "Failed to lock TPM (%x)\n", rv); - vb2api_fail(&ctx, VB2_RECOVERY_RO_TPM_L_ERROR, 0); - save_if_needed(&ctx); - vboot_reboot(); + if (IS_ENABLED(CONFIG_RETURN_FROM_VERSTAGE)) { + verstage_main(); + } else { + run_romstage(); + hlt(); } - - printk(BIOS_INFO, "Slot %c is selected\n", is_slot_a(&ctx) ? 'A' : 'B'); - vb2_set_selected_region(wd, &fw_main); - timestamp_add_now(TS_END_VBOOT); }
-#if IS_ENABLED(CONFIG_RETURN_FROM_VERSTAGE) -void main(void) -{ - console_init(); - exception_init(); - verstage_main(); -} -#endif +/* This is for boards that rely on main() for an entry point of a stage. */ +void main(void) __attribute__((alias ("verstage_chain_load"))); diff --git a/src/vendorcode/google/chromeos/vboot_common.h b/src/vendorcode/google/chromeos/vboot_common.h index f4d5e11..3a9c89b 100644 --- a/src/vendorcode/google/chromeos/vboot_common.h +++ b/src/vendorcode/google/chromeos/vboot_common.h @@ -48,4 +48,10 @@ int vboot_enable_developer(void);
void vboot_reboot(void);
+/* Main logic for verified boot. verstage() is the stage entry point + * while the verstage_main() is just the core logic. */ +void verstage_main(void); +void verstage_mainboard_init(void); +void verstage(void); + #endif /* VBOOT_COMMON_H */