From 2332c7459ebb81c4dd4c3cc8b19beca820e93968 Mon Sep 17 00:00:00 2001 From: Joel Kitching Date: Wed, 23 Oct 2019 15:01:37 +0800 Subject: vboot: use vboot persistent context vb2_context object is now stored on the workbuf as part of vb2_shared_data. Use vboot's new API functions vb2api_init and vb2api_relocate to create and move the workbuf. BUG=b:124141368, chromium:994060 TEST=Build locally BRANCH=none Change-Id: I051be1e47bf79b15a1689d49a5d4c031e9363dfa Signed-off-by: Joel Kitching Also-Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/1902339 Reviewed-on: https://review.coreboot.org/c/coreboot/+/36300 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi Reviewed-by: Stefan Reinauer Reviewed-by: Maulik V Vaghela --- src/security/vboot/bootmode.c | 2 +- src/security/vboot/common.c | 74 +++++++++++++++++++++++----------------- src/security/vboot/misc.h | 13 ++++--- src/security/vboot/vboot_logic.c | 69 ++++++++++++++++++------------------- 4 files changed, 84 insertions(+), 74 deletions(-) (limited to 'src/security') diff --git a/src/security/vboot/bootmode.c b/src/security/vboot/bootmode.c index 4625bcdff2..0ab0431f46 100644 --- a/src/security/vboot/bootmode.c +++ b/src/security/vboot/bootmode.c @@ -26,7 +26,7 @@ static int vboot_get_recovery_reason_shared_data(void) { - struct vb2_shared_data *sd = vboot_get_shared_data(); + struct vb2_shared_data *sd = vb2_get_sd(vboot_get_context()); assert(sd); return sd->recovery_reason; } diff --git a/src/security/vboot/common.c b/src/security/vboot/common.c index 626fbc52a4..043748cbef 100644 --- a/src/security/vboot/common.c +++ b/src/security/vboot/common.c @@ -24,6 +24,8 @@ #include #include +static struct vb2_context *vboot_ctx CAR_GLOBAL; + struct vboot_working_data *vboot_get_working_data(void) { struct vboot_working_data *wd = NULL; @@ -40,43 +42,45 @@ struct vboot_working_data *vboot_get_working_data(void) return wd; } -void vboot_init_work_context(struct vb2_context *ctx) +static inline void *vboot_get_workbuf(struct vboot_working_data *wd) +{ + return (void *)((uintptr_t)wd + wd->buffer_offset); +} + +struct vb2_context *vboot_get_context(void) { + struct vb2_context **vboot_ctx_ptr = car_get_var_ptr(&vboot_ctx); struct vboot_working_data *wd; - /* First initialize the working data region. */ + /* Return if context has already been initialized/restored. */ + if (*vboot_ctx_ptr) + return *vboot_ctx_ptr; + wd = vboot_get_working_data(); - memset(wd, 0, VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE); + + /* Restore context from a previous stage. */ + if (vboot_logic_executed()) { + assert(vb2api_reinit(vboot_get_workbuf(wd), + vboot_ctx_ptr) == VB2_SUCCESS); + return *vboot_ctx_ptr; + } + + assert(verification_should_run()); /* * vboot prefers 16-byte alignment. This takes away 16 bytes * from the VBOOT2_WORK region, but the vboot devs said that's okay. */ + memset(wd, 0, sizeof(*wd)); wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16); wd->buffer_size = VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE - wd->buffer_offset; - /* Initialize the vb2_context. */ - memset(ctx, 0, sizeof(*ctx)); - ctx->workbuf = (void *)vboot_get_shared_data(); - ctx->workbuf_size = wd->buffer_size; -} + /* Initialize vb2_shared_data and friends. */ + assert(vb2api_init(vboot_get_workbuf(wd), wd->buffer_size, + vboot_ctx_ptr) == VB2_SUCCESS); -void vboot_finalize_work_context(struct vb2_context *ctx) -{ - /* - * Shrink buffer_size so that vboot_migrate_cbmem knows how - * much of vboot_working_data needs to be copied into CBMEM - * (if applicable), and so that downstream users know how much - * of the workbuf is currently used. - */ - vboot_get_working_data()->buffer_size = ctx->workbuf_used; -} - -struct vb2_shared_data *vboot_get_shared_data(void) -{ - struct vboot_working_data *wd = vboot_get_working_data(); - return (void *)((uintptr_t)wd + wd->buffer_offset); + return *vboot_ctx_ptr; } int vboot_get_selected_region(struct region *region) @@ -126,17 +130,25 @@ int vboot_is_slot_selected(void) */ static void vboot_migrate_cbmem(int unused) { - const struct vboot_working_data *wd_preram = + const size_t cbmem_size = VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE; + struct vboot_working_data *wd_preram = (struct vboot_working_data *)_vboot2_work; - size_t cbmem_size = wd_preram->buffer_offset + wd_preram->buffer_size; struct vboot_working_data *wd_cbmem = cbmem_add(CBMEM_ID_VBOOT_WORKBUF, cbmem_size); assert(wd_cbmem != NULL); - - printk(BIOS_DEBUG, - "VBOOT: copying vboot_working_data (%zu bytes) to CBMEM...\n", - cbmem_size); - memcpy(wd_cbmem, wd_preram, cbmem_size); + memcpy(wd_cbmem, wd_preram, sizeof(struct vboot_working_data)); + /* + * TODO(chromium:1021452): buffer_size is uint16_t and not large enough + * to hold the kernel verification workbuf size. The only code which + * reads this value is in lb_vboot_workbuf() for lb_range->range_size. + * This value being zero doesn't cause any problems, since it is never + * read downstream. Fix or deprecate vboot_working_data. + */ + wd_cbmem->buffer_size = 0; + vb2api_relocate(vboot_get_workbuf(wd_cbmem), + vboot_get_workbuf(wd_preram), + cbmem_size - wd_cbmem->buffer_offset, + car_get_var_ptr(&vboot_ctx)); } ROMSTAGE_CBMEM_INIT_HOOK(vboot_migrate_cbmem) #else @@ -144,7 +156,7 @@ static void vboot_setup_cbmem(int unused) { struct vboot_working_data *wd_cbmem = cbmem_add(CBMEM_ID_VBOOT_WORKBUF, - VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE); + VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE); assert(wd_cbmem != NULL); } ROMSTAGE_CBMEM_INIT_HOOK(vboot_setup_cbmem) diff --git a/src/security/vboot/misc.h b/src/security/vboot/misc.h index 1458354ffc..b45fc9c60d 100644 --- a/src/security/vboot/misc.h +++ b/src/security/vboot/misc.h @@ -29,10 +29,11 @@ struct selected_region { }; /* - * this is placed at the start of the vboot work buffer. selected_region is used - * for the verstage to return the location of the selected slot. buffer is used - * by the vboot2 core. Keep the struct CPU architecture agnostic as it crosses - * stage boundaries. + * Stores vboot-related information. selected_region is used by verstage to + * store the location of the selected slot. buffer is used by vboot to store + * its work buffer. vb2_context is contained within this work buffer, and is + * accessible via vboot_init_context() and vboot_get_context() (see below). + * Keep the struct CPU architecture agnostic as it crosses stage boundaries. */ struct vboot_working_data { struct selected_region selected_region; @@ -54,9 +55,7 @@ struct vboot_working_data { * Source: security/vboot/common.c */ struct vboot_working_data *vboot_get_working_data(void); -void vboot_init_work_context(struct vb2_context *ctx); -void vboot_finalize_work_context(struct vb2_context *ctx); -struct vb2_shared_data *vboot_get_shared_data(void); +struct vb2_context *vboot_get_context(void); /* Returns 0 on success. < 0 on failure. */ int vboot_get_selected_region(struct region *region); diff --git a/src/security/vboot/vboot_logic.c b/src/security/vboot/vboot_logic.c index da6231ae65..511014711d 100644 --- a/src/security/vboot/vboot_logic.c +++ b/src/security/vboot/vboot_logic.c @@ -319,17 +319,17 @@ ROMSTAGE_CBMEM_INIT_HOOK(vboot_log_and_clear_recovery_mode_switch) */ void verstage_main(void) { - struct vb2_context ctx; + struct vb2_context *ctx; struct region_device fw_main; vb2_error_t rv; timestamp_add_now(TS_START_VBOOT); /* Set up context and work buffer */ - vboot_init_work_context(&ctx); + ctx = vboot_get_context(); /* Initialize and read nvdata from non-volatile storage. */ - vbnv_init(ctx.nvdata); + vbnv_init(ctx->nvdata); /* Set S3 resume flag if vboot should behave differently when selecting * which slot to boot. This is only relevant to vboot if the platform @@ -337,51 +337,51 @@ void verstage_main(void) * the same slot that it booted from. */ if (CONFIG(RESUME_PATH_SAME_AS_BOOT) && vboot_platform_is_resuming()) - ctx.flags |= VB2_CONTEXT_S3_RESUME; + ctx->flags |= VB2_CONTEXT_S3_RESUME; /* 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); - if (vboot_setup_tpm(&ctx) == TPM_SUCCESS) - antirollback_read_space_firmware(&ctx); + if (vboot_setup_tpm(ctx) == TPM_SUCCESS) + antirollback_read_space_firmware(ctx); timestamp_add_now(TS_END_TPMINIT); /* Enable measured boot mode */ if (CONFIG(VBOOT_MEASURED_BOOT) && - !(ctx.flags & VB2_CONTEXT_S3_RESUME)) { + !(ctx->flags & VB2_CONTEXT_S3_RESUME)) { if (vboot_init_crtm() != VB2_SUCCESS) die_with_post_code(POST_INVALID_ROM, "Initializing measured boot mode failed!"); } if (get_recovery_mode_switch()) { - ctx.flags |= VB2_CONTEXT_FORCE_RECOVERY_MODE; + ctx->flags |= VB2_CONTEXT_FORCE_RECOVERY_MODE; if (CONFIG(VBOOT_DISABLE_DEV_ON_RECOVERY)) - ctx.flags |= VB2_CONTEXT_DISABLE_DEVELOPER_MODE; + ctx->flags |= VB2_CONTEXT_DISABLE_DEVELOPER_MODE; } if (CONFIG(VBOOT_WIPEOUT_SUPPORTED) && get_wipeout_mode_switch()) - ctx.flags |= VB2_CONTEXT_FORCE_WIPEOUT_MODE; + ctx->flags |= VB2_CONTEXT_FORCE_WIPEOUT_MODE; if (CONFIG(VBOOT_LID_SWITCH) && !get_lid_switch()) - ctx.flags |= VB2_CONTEXT_NOFAIL_BOOT; + ctx->flags |= VB2_CONTEXT_NOFAIL_BOOT; /* Mainboard/SoC always initializes display. */ if (!CONFIG(VBOOT_MUST_REQUEST_DISPLAY)) - ctx.flags |= VB2_CONTEXT_DISPLAY_INIT; + ctx->flags |= VB2_CONTEXT_DISPLAY_INIT; /* Do early init (set up secdata and NVRAM, load GBB) */ printk(BIOS_INFO, "Phase 1\n"); - rv = vb2api_fw_phase1(&ctx); + rv = vb2api_fw_phase1(ctx); /* Jot down some information from vboot which may be required later on in coreboot boot flow. */ - if (ctx.flags & VB2_CONTEXT_DISPLAY_INIT) + if (ctx->flags & VB2_CONTEXT_DISPLAY_INIT) /* Mainboard/SoC should initialize display. */ vboot_get_working_data()->flags |= VBOOT_WD_FLAG_DISPLAY_INIT; - if (ctx.flags & VB2_CONTEXT_DEVELOPER_MODE) + if (ctx->flags & VB2_CONTEXT_DEVELOPER_MODE) vboot_get_working_data()->flags |= VBOOT_WD_FLAG_DEVELOPER_MODE; if (rv) { @@ -393,58 +393,58 @@ void verstage_main(void) */ if (rv == VB2_ERROR_API_PHASE1_RECOVERY) { printk(BIOS_INFO, "Recovery requested (%x)\n", rv); - save_if_needed(&ctx); - extend_pcrs(&ctx); /* ignore failures */ + save_if_needed(ctx); + extend_pcrs(ctx); /* ignore failures */ goto verstage_main_exit; } printk(BIOS_INFO, "Reboot requested (%x)\n", rv); - save_if_needed(&ctx); + 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); + rv = vb2api_fw_phase2(ctx); if (rv) { printk(BIOS_INFO, "Reboot requested (%x)\n", rv); - save_if_needed(&ctx); + 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); + 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); + save_if_needed(ctx); vboot_reboot(); } printk(BIOS_INFO, "Phase 4\n"); - rv = locate_firmware(&ctx, &fw_main); + rv = locate_firmware(ctx, &fw_main); if (rv) die_with_post_code(POST_INVALID_ROM, "Failed to read FMAP to locate firmware"); - rv = hash_body(&ctx, &fw_main); - save_if_needed(&ctx); + rv = hash_body(ctx, &fw_main); + save_if_needed(ctx); if (rv) { printk(BIOS_INFO, "Reboot requested (%x)\n", rv); vboot_reboot(); } /* Only extend PCRs once on boot. */ - if (!(ctx.flags & VB2_CONTEXT_S3_RESUME)) { + if (!(ctx->flags & VB2_CONTEXT_S3_RESUME)) { timestamp_add_now(TS_START_TPMPCR); - rv = extend_pcrs(&ctx); + 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); + vb2api_fail(ctx, VB2_RECOVERY_RO_TPM_U_ERROR, rv); + save_if_needed(ctx); vboot_reboot(); } timestamp_add_now(TS_END_TPMPCR); @@ -456,8 +456,8 @@ void verstage_main(void) 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); + vb2api_fail(ctx, VB2_RECOVERY_RO_TPM_L_ERROR, 0); + save_if_needed(ctx); vboot_reboot(); } timestamp_add_now(TS_END_TPMLOCK); @@ -468,14 +468,14 @@ void verstage_main(void) if (rv) { printk(BIOS_INFO, "Failed to lock rec hash space(%x)\n", rv); - vb2api_fail(&ctx, VB2_RECOVERY_RO_TPM_REC_HASH_L_ERROR, + vb2api_fail(ctx, VB2_RECOVERY_RO_TPM_REC_HASH_L_ERROR, 0); - save_if_needed(&ctx); + save_if_needed(ctx); vboot_reboot(); } } - printk(BIOS_INFO, "Slot %c is selected\n", is_slot_a(&ctx) ? 'A' : 'B'); + printk(BIOS_INFO, "Slot %c is selected\n", is_slot_a(ctx) ? 'A' : 'B'); vboot_set_selected_region(region_device_region(&fw_main)); verstage_main_exit: @@ -487,6 +487,5 @@ void verstage_main(void) /* Save recovery reason in case of unexpected reboots on x86. */ vboot_save_recovery_reason_vbnv(); - vboot_finalize_work_context(&ctx); timestamp_add_now(TS_END_VBOOT); } -- cgit v1.2.3