diff options
Diffstat (limited to 'services/std_svc/drtm')
| -rw-r--r-- | services/std_svc/drtm/drtm_dma_prot.c | 263 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_dma_prot.h | 50 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_main.c | 839 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_main.h | 106 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_measurements.c | 214 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_measurements.h | 40 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_remediation.c | 59 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_remediation.h | 15 | ||||
| -rw-r--r-- | services/std_svc/drtm/drtm_res_address_map.c | 88 |
9 files changed, 1674 insertions, 0 deletions
diff --git a/services/std_svc/drtm/drtm_dma_prot.c b/services/std_svc/drtm/drtm_dma_prot.c new file mode 100644 index 0000000..48317fd --- /dev/null +++ b/services/std_svc/drtm/drtm_dma_prot.c @@ -0,0 +1,263 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + * DRTM DMA protection. + * + * Authors: + * Lucian Paul-Trifu <lucian.paultrifu@gmail.com> + * + */ + +#include <stdint.h> +#include <string.h> + +#include <common/debug.h> +#include <drivers/arm/smmu_v3.h> +#include "drtm_dma_prot.h" +#include "drtm_main.h" +#include "drtm_remediation.h" +#include <plat/common/platform.h> +#include <smccc_helpers.h> + +/* + * ________________________ LAUNCH success ________________________ + * | Initial | -------------------> | Prot engaged | + * |````````````````````````| |````````````````````````| + * | request.type == NONE | | request.type != NONE | + * | | <------------------- | | + * `________________________' UNPROTECT_MEM `________________________' + * + * Transitions that are not shown correspond to ABI calls that do not change + * state and result in an error being returned to the caller. + */ +static struct dma_prot active_prot = { + .type = PROTECT_NONE, +}; + +/* Version-independent type. */ +typedef struct drtm_dl_dma_prot_args_v1 struct_drtm_dl_dma_prot_args; + +/* + * This function checks that platform supports complete DMA protection. + * and returns false - if the platform supports complete DMA protection. + * and returns true - if the platform does not support complete DMA protection. + */ +bool drtm_dma_prot_init(void) +{ + bool must_init_fail = false; + const uintptr_t *smmus; + size_t num_smmus = 0; + unsigned int total_smmus; + + /* Warns presence of non-host platforms */ + if (plat_has_non_host_platforms()) { + WARN("DRTM: the platform includes trusted DMA-capable devices" + " (non-host platforms)\n"); + } + + /* + * DLME protection is uncertain on platforms with peripherals whose + * DMA is not managed by an SMMU. DRTM doesn't work on such platforms. + */ + if (plat_has_unmanaged_dma_peripherals()) { + ERROR("DRTM: this platform does not provide DMA protection\n"); + must_init_fail = true; + } + + /* + * Check that the platform reported all SMMUs. + * It is acceptable if the platform doesn't have any SMMUs when it + * doesn't have any DMA-capable devices. + */ + total_smmus = plat_get_total_smmus(); + plat_enumerate_smmus(&smmus, &num_smmus); + if (num_smmus != total_smmus) { + ERROR("DRTM: could not discover all SMMUs\n"); + must_init_fail = true; + } + + return must_init_fail; +} + +/* + * Checks that the DMA protection arguments are valid and that the given + * protected regions are covered by DMA protection. + */ +enum drtm_retc drtm_dma_prot_check_args(const struct_drtm_dl_dma_prot_args *a, + int a_dma_prot_type, + drtm_mem_region_t p) +{ + switch ((enum dma_prot_type)a_dma_prot_type) { + case PROTECT_MEM_ALL: + if (a->dma_prot_table_paddr || a->dma_prot_table_size) { + ERROR("DRTM: invalid launch due to inconsistent" + " DMA protection arguments\n"); + return MEM_PROTECT_INVALID; + } + /* + * Full DMA protection ought to ensure that the DLME and NWd + * DCE regions are protected, no further checks required. + */ + return SUCCESS; + + default: + ERROR("DRTM: invalid launch due to unsupported DMA protection type\n"); + return MEM_PROTECT_INVALID; + } +} + +enum drtm_retc drtm_dma_prot_engage(const struct_drtm_dl_dma_prot_args *a, + int a_dma_prot_type) +{ + const uintptr_t *smmus; + size_t num_smmus = 0; + + if (active_prot.type != PROTECT_NONE) { + ERROR("DRTM: launch denied as previous DMA protection" + " is still engaged\n"); + return DENIED; + } + + if (a_dma_prot_type == PROTECT_NONE) { + return SUCCESS; + /* Only PROTECT_MEM_ALL is supported currently. */ + } else if (a_dma_prot_type != PROTECT_MEM_ALL) { + ERROR("%s(): unimplemented DMA protection type\n", __func__); + panic(); + } + + /* + * Engage SMMUs in accordance with the request we have previously received. + * Only PROTECT_MEM_ALL is implemented currently. + */ + plat_enumerate_smmus(&smmus, &num_smmus); + for (const uintptr_t *smmu = smmus; smmu < smmus+num_smmus; smmu++) { + /* + * TODO: Invalidate SMMU's Stage-1 and Stage-2 TLB entries. This ensures + * that any outstanding device transactions are completed, see Section + * 3.21.1, specification IHI_0070_C_a for an approximate reference. + */ + int rc = smmuv3_ns_set_abort_all(*smmu); + if (rc != 0) { + ERROR("DRTM: SMMU at PA 0x%lx failed to engage DMA protection" + " rc=%d\n", *smmu, rc); + return INTERNAL_ERROR; + } + } + + /* + * TODO: Restrict DMA from the GIC. + * + * Full DMA protection may be achieved as follows: + * + * With a GICv3: + * - Set GICR_CTLR.EnableLPIs to 0, for each GICR; + * GICR_CTLR.RWP == 0 must be the case before finishing, for each GICR. + * - Set GITS_CTLR.Enabled to 0; + * GITS_CTLR.Quiescent == 1 must be the case before finishing. + * + * In addition, with a GICv4: + * - Set GICR_VPENDBASER.Valid to 0, for each GICR; + * GICR_CTLR.RWP == 0 must be the case before finishing, for each GICR. + * + * Alternatively, e.g. if some bit values cannot be changed at runtime, + * this procedure should return an error if the LPI Pending and + * Configuration tables overlap the regions being protected. + */ + + active_prot.type = a_dma_prot_type; + + return SUCCESS; +} + +/* + * Undo what has previously been done in drtm_dma_prot_engage(), or enter + * remediation if it is not possible. + */ +enum drtm_retc drtm_dma_prot_disengage(void) +{ + const uintptr_t *smmus; + size_t num_smmus = 0; + const char *err_str = "cannot undo PROTECT_MEM_ALL SMMU config"; + + if (active_prot.type == PROTECT_NONE) { + return SUCCESS; + /* Only PROTECT_MEM_ALL is supported currently. */ + } else if (active_prot.type != PROTECT_MEM_ALL) { + ERROR("%s(): unimplemented DMA protection type\n", __func__); + panic(); + } + + /* + * For PROTECT_MEM_ALL, undo the SMMU configuration for "abort all" mode + * done during engage(). + */ + /* Simply enter remediation for now. */ + (void)smmus; + (void)num_smmus; + drtm_enter_remediation(1ULL, err_str); + + /* TODO: Undo GIC DMA restrictions. */ + + active_prot.type = PROTECT_NONE; + + return SUCCESS; +} + +uint64_t drtm_unprotect_mem(void *ctx) +{ + enum drtm_retc ret; + + switch (active_prot.type) { + case PROTECT_NONE: + ERROR("DRTM: invalid UNPROTECT_MEM, no DMA protection has" + " previously been engaged\n"); + ret = DENIED; + break; + + case PROTECT_MEM_ALL: + /* + * UNPROTECT_MEM is a no-op for PROTECT_MEM_ALL: DRTM must not touch + * the NS SMMU as it is expected that the DLME has configured it. + */ + active_prot.type = PROTECT_NONE; + + ret = SUCCESS; + break; + + default: + ret = drtm_dma_prot_disengage(); + break; + } + + SMC_RET1(ctx, ret); +} + +void drtm_dma_prot_serialise_table(uint8_t *dst, size_t *size_out) +{ + if (active_prot.type == PROTECT_NONE) { + return; + } else if (active_prot.type != PROTECT_MEM_ALL) { + ERROR("%s(): unimplemented DMA protection type\n", __func__); + panic(); + } + + struct __packed descr_table_1 { + drtm_memory_region_descriptor_table_t header; + drtm_mem_region_t regions[1]; + } prot_table = { + .header = { + .revision = 1, + .num_regions = sizeof(((struct descr_table_1 *)NULL)->regions) / + sizeof(((struct descr_table_1 *)NULL)->regions[0]) + }, + .regions = { + {.region_address = 0, PAGES_AND_TYPE(UINT64_MAX, 0x3)}, + } + }; + + memcpy(dst, &prot_table, sizeof(prot_table)); + *size_out = sizeof(prot_table); +} diff --git a/services/std_svc/drtm/drtm_dma_prot.h b/services/std_svc/drtm/drtm_dma_prot.h new file mode 100644 index 0000000..79dc9cb --- /dev/null +++ b/services/std_svc/drtm/drtm_dma_prot.h @@ -0,0 +1,50 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + */ +#ifndef DRTM_DMA_PROT_H +#define DRTM_DMA_PROT_H + +#include <stdint.h> +#include <plat/common/platform.h> +#include <services/drtm_svc.h> + +struct __packed drtm_dl_dma_prot_args_v1 { + uint64_t dma_prot_table_paddr; + uint64_t dma_prot_table_size; +}; + +/* Values for DRTM_PROTECT_MEMORY */ +enum dma_prot_type { + PROTECT_NONE = -1, + PROTECT_MEM_ALL = 0, + PROTECT_MEM_REGION = 2, +}; + +struct dma_prot { + enum dma_prot_type type; +}; + +#define DRTM_MEM_REGION_PAGES_AND_TYPE(pages, type) \ + (((uint64_t)(pages) & (((uint64_t)1 << 52) - 1)) \ + | (((uint64_t)(type) & 0x7) << 52)) + +#define PAGES_AND_TYPE(pages, type) \ + .region_size_type = DRTM_MEM_REGION_PAGES_AND_TYPE(pages, type) + +/* Opaque / encapsulated type. */ +typedef struct drtm_dl_dma_prot_args_v1 drtm_dl_dma_prot_args_v1_t; + +bool drtm_dma_prot_init(void); +enum drtm_retc drtm_dma_prot_check_args(const drtm_dl_dma_prot_args_v1_t *a, + int a_dma_prot_type, + drtm_mem_region_t p); +enum drtm_retc drtm_dma_prot_engage(const drtm_dl_dma_prot_args_v1_t *a, + int a_dma_prot_type); +enum drtm_retc drtm_dma_prot_disengage(void); +uint64_t drtm_unprotect_mem(void *ctx); +void drtm_dma_prot_serialise_table(uint8_t *dst, size_t *size_out); + +#endif /* DRTM_DMA_PROT_H */ diff --git a/services/std_svc/drtm/drtm_main.c b/services/std_svc/drtm/drtm_main.c new file mode 100644 index 0000000..3acf683 --- /dev/null +++ b/services/std_svc/drtm/drtm_main.c @@ -0,0 +1,839 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + * DRTM service + * + * Authors: + * Lucian Paul-Trifu <lucian.paultrifu@gmail.com> + * Brian Nezvadovitz <brinez@microsoft.com> 2021-02-01 + */ + +#include <stdint.h> + +#include <arch.h> +#include <arch_helpers.h> +#include <common/bl_common.h> +#include <common/debug.h> +#include <common/runtime_svc.h> +#include <drivers/auth/crypto_mod.h> +#include "drtm_main.h" +#include "drtm_measurements.h" +#include "drtm_remediation.h" +#include <lib/el3_runtime/context_mgmt.h> +#include <lib/psci/psci_lib.h> +#include <lib/xlat_tables/xlat_tables_v2.h> +#include <plat/common/platform.h> +#include <services/drtm_svc.h> +#include <services/sdei.h> +#include <platform_def.h> + +/* Structure to store DRTM features specific to the platform. */ +static drtm_features_t plat_drtm_features; + +/* DRTM-formatted memory map. */ +static drtm_memory_region_descriptor_table_t *plat_drtm_mem_map; + +/* DLME header */ +struct_dlme_data_header dlme_data_hdr_init; + +/* Minimum data memory requirement */ +uint64_t dlme_data_min_size; + +int drtm_setup(void) +{ + bool rc; + const plat_drtm_tpm_features_t *plat_tpm_feat; + const plat_drtm_dma_prot_features_t *plat_dma_prot_feat; + + INFO("DRTM service setup\n"); + + /* Read boot PE ID from MPIDR */ + plat_drtm_features.boot_pe_id = read_mpidr_el1() & MPIDR_AFFINITY_MASK; + + rc = drtm_dma_prot_init(); + if (rc) { + return INTERNAL_ERROR; + } + + /* + * initialise the platform supported crypto module that will + * be used by the DRTM-service to calculate hash of DRTM- + * implementation specific components + */ + crypto_mod_init(); + + /* Build DRTM-compatible address map. */ + plat_drtm_mem_map = drtm_build_address_map(); + if (plat_drtm_mem_map == NULL) { + return INTERNAL_ERROR; + } + + /* Get DRTM features from platform hooks. */ + plat_tpm_feat = plat_drtm_get_tpm_features(); + if (plat_tpm_feat == NULL) { + return INTERNAL_ERROR; + } + + plat_dma_prot_feat = plat_drtm_get_dma_prot_features(); + if (plat_dma_prot_feat == NULL) { + return INTERNAL_ERROR; + } + + /* + * Add up minimum DLME data memory. + * + * For systems with complete DMA protection there is only one entry in + * the protected regions table. + */ + if (plat_dma_prot_feat->dma_protection_support == + ARM_DRTM_DMA_PROT_FEATURES_DMA_SUPPORT_COMPLETE) { + dlme_data_min_size = + sizeof(drtm_memory_region_descriptor_table_t) + + sizeof(drtm_mem_region_t); + dlme_data_hdr_init.dlme_prot_regions_size = dlme_data_min_size; + } else { + /* + * TODO set protected regions table size based on platform DMA + * protection configuration + */ + panic(); + } + + dlme_data_hdr_init.dlme_addr_map_size = drtm_get_address_map_size(); + dlme_data_hdr_init.dlme_tcb_hashes_table_size = + plat_drtm_get_tcb_hash_table_size(); + dlme_data_hdr_init.dlme_impdef_region_size = + plat_drtm_get_imp_def_dlme_region_size(); + + dlme_data_min_size += dlme_data_hdr_init.dlme_addr_map_size + + PLAT_DRTM_EVENT_LOG_MAX_SIZE + + dlme_data_hdr_init.dlme_tcb_hashes_table_size + + dlme_data_hdr_init.dlme_impdef_region_size; + + dlme_data_min_size = page_align(dlme_data_min_size, UP)/PAGE_SIZE; + + /* Fill out platform DRTM features structure */ + /* Only support default PCR schema (0x1) in this implementation. */ + ARM_DRTM_TPM_FEATURES_SET_PCR_SCHEMA(plat_drtm_features.tpm_features, + ARM_DRTM_TPM_FEATURES_PCR_SCHEMA_DEFAULT); + ARM_DRTM_TPM_FEATURES_SET_TPM_HASH(plat_drtm_features.tpm_features, + plat_tpm_feat->tpm_based_hash_support); + ARM_DRTM_TPM_FEATURES_SET_FW_HASH(plat_drtm_features.tpm_features, + plat_tpm_feat->firmware_hash_algorithm); + ARM_DRTM_MIN_MEM_REQ_SET_MIN_DLME_DATA_SIZE(plat_drtm_features.minimum_memory_requirement, + dlme_data_min_size); + ARM_DRTM_MIN_MEM_REQ_SET_DCE_SIZE(plat_drtm_features.minimum_memory_requirement, + plat_drtm_get_min_size_normal_world_dce()); + ARM_DRTM_DMA_PROT_FEATURES_SET_MAX_REGIONS(plat_drtm_features.dma_prot_features, + plat_dma_prot_feat->max_num_mem_prot_regions); + ARM_DRTM_DMA_PROT_FEATURES_SET_DMA_SUPPORT(plat_drtm_features.dma_prot_features, + plat_dma_prot_feat->dma_protection_support); + ARM_DRTM_TCB_HASH_FEATURES_SET_MAX_NUM_HASHES(plat_drtm_features.tcb_hash_features, + plat_drtm_get_tcb_hash_features()); + + return 0; +} + +static inline void invalidate_icache_all(void) +{ + __asm__ volatile("ic ialluis"); + dsb(); + isb(); +} + +static inline uint64_t drtm_features_tpm(void *ctx) +{ + SMC_RET2(ctx, 1ULL, /* TPM feature is supported */ + plat_drtm_features.tpm_features); +} + +static inline uint64_t drtm_features_mem_req(void *ctx) +{ + SMC_RET2(ctx, 1ULL, /* memory req Feature is supported */ + plat_drtm_features.minimum_memory_requirement); +} + +static inline uint64_t drtm_features_boot_pe_id(void *ctx) +{ + SMC_RET2(ctx, 1ULL, /* Boot PE feature is supported */ + plat_drtm_features.boot_pe_id); +} + +static inline uint64_t drtm_features_dma_prot(void *ctx) +{ + SMC_RET2(ctx, 1ULL, /* DMA protection feature is supported */ + plat_drtm_features.dma_prot_features); +} + +static inline uint64_t drtm_features_tcb_hashes(void *ctx) +{ + SMC_RET2(ctx, 1ULL, /* TCB hash feature is supported */ + plat_drtm_features.tcb_hash_features); +} + +static enum drtm_retc drtm_dl_check_caller_el(void *ctx) +{ + uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ctx), CTX_SPSR_EL3); + uint64_t dl_caller_el; + uint64_t dl_caller_aarch; + + dl_caller_el = spsr_el3 >> MODE_EL_SHIFT & MODE_EL_MASK; + dl_caller_aarch = spsr_el3 >> MODE_RW_SHIFT & MODE_RW_MASK; + + /* Caller's security state is checked from drtm_smc_handle function */ + + /* Caller can be NS-EL2/EL1 */ + if (dl_caller_el == MODE_EL3) { + ERROR("DRTM: invalid launch from EL3\n"); + return DENIED; + } + + if (dl_caller_aarch != MODE_RW_64) { + ERROR("DRTM: invalid launch from non-AArch64 execution state\n"); + return DENIED; + } + + return SUCCESS; +} + +static enum drtm_retc drtm_dl_check_cores(void) +{ + bool running_on_single_core; + uint64_t this_pe_aff_value = read_mpidr_el1() & MPIDR_AFFINITY_MASK; + + if (this_pe_aff_value != plat_drtm_features.boot_pe_id) { + ERROR("DRTM: invalid launch on a non-boot PE\n"); + return DENIED; + } + + running_on_single_core = psci_is_last_on_cpu_safe(); + if (!running_on_single_core) { + ERROR("DRTM: invalid launch due to non-boot PE not being turned off\n"); + return DENIED; + } + + return SUCCESS; +} + +static enum drtm_retc drtm_dl_prepare_dlme_data(const struct_drtm_dl_args *args) +{ + int rc; + uint64_t dlme_data_paddr; + size_t dlme_data_max_size; + uintptr_t dlme_data_mapping; + struct_dlme_data_header *dlme_data_hdr; + uint8_t *dlme_data_cursor; + size_t dlme_data_mapping_bytes; + size_t serialised_bytes_actual; + + dlme_data_paddr = args->dlme_paddr + args->dlme_data_off; + dlme_data_max_size = args->dlme_size - args->dlme_data_off; + + /* + * The capacity of the given DLME data region is checked when + * the other dynamic launch arguments are. + */ + if (dlme_data_max_size < dlme_data_min_size) { + ERROR("%s: assertion failed:" + " dlme_data_max_size (%ld) < dlme_data_total_bytes_req (%ld)\n", + __func__, dlme_data_max_size, dlme_data_min_size); + panic(); + } + + /* Map the DLME data region as NS memory. */ + dlme_data_mapping_bytes = ALIGNED_UP(dlme_data_max_size, DRTM_PAGE_SIZE); + rc = mmap_add_dynamic_region_alloc_va(dlme_data_paddr, + &dlme_data_mapping, + dlme_data_mapping_bytes, + MT_RW_DATA | MT_NS | + MT_SHAREABILITY_ISH); + if (rc != 0) { + WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n", + __func__, rc); + return INTERNAL_ERROR; + } + dlme_data_hdr = (struct_dlme_data_header *)dlme_data_mapping; + dlme_data_cursor = (uint8_t *)dlme_data_hdr + sizeof(*dlme_data_hdr); + + memcpy(dlme_data_hdr, (const void *)&dlme_data_hdr_init, + sizeof(*dlme_data_hdr)); + + /* Set the header version and size. */ + dlme_data_hdr->version = 1; + dlme_data_hdr->this_hdr_size = sizeof(*dlme_data_hdr); + + /* Prepare DLME protected regions. */ + drtm_dma_prot_serialise_table(dlme_data_cursor, + &serialised_bytes_actual); + assert(serialised_bytes_actual == + dlme_data_hdr->dlme_prot_regions_size); + dlme_data_cursor += serialised_bytes_actual; + + /* Prepare DLME address map. */ + if (plat_drtm_mem_map != NULL) { + memcpy(dlme_data_cursor, plat_drtm_mem_map, + dlme_data_hdr->dlme_addr_map_size); + } else { + WARN("DRTM: DLME address map is not in the cache\n"); + } + dlme_data_cursor += dlme_data_hdr->dlme_addr_map_size; + + /* Prepare DRTM event log for DLME. */ + drtm_serialise_event_log(dlme_data_cursor, &serialised_bytes_actual); + assert(serialised_bytes_actual <= PLAT_DRTM_EVENT_LOG_MAX_SIZE); + dlme_data_hdr->dlme_tpm_log_size = serialised_bytes_actual; + dlme_data_cursor += serialised_bytes_actual; + + /* + * TODO: Prepare the TCB hashes for DLME, currently its size + * 0 + */ + dlme_data_cursor += dlme_data_hdr->dlme_tcb_hashes_table_size; + + /* Implementation-specific region size is unused. */ + dlme_data_cursor += dlme_data_hdr->dlme_impdef_region_size; + + /* + * Prepare DLME data size, includes all data region referenced above + * alongwith the DLME data header + */ + dlme_data_hdr->dlme_data_size = dlme_data_cursor - (uint8_t *)dlme_data_hdr; + + /* Unmap the DLME data region. */ + rc = mmap_remove_dynamic_region(dlme_data_mapping, dlme_data_mapping_bytes); + if (rc != 0) { + ERROR("%s(): mmap_remove_dynamic_region() failed" + " unexpectedly rc=%d\n", __func__, rc); + panic(); + } + + return SUCCESS; +} + +/* + * Note: accesses to the dynamic launch args, and to the DLME data are + * little-endian as required, thanks to TF-A BL31 init requirements. + */ +static enum drtm_retc drtm_dl_check_args(uint64_t x1, + struct_drtm_dl_args *a_out) +{ + uint64_t dlme_start, dlme_end; + uint64_t dlme_img_start, dlme_img_ep, dlme_img_end; + uint64_t dlme_data_start, dlme_data_end; + uintptr_t va_mapping; + size_t va_mapping_size; + struct_drtm_dl_args *a; + struct_drtm_dl_args args_buf; + int rc; + + if (x1 % DRTM_PAGE_SIZE != 0) { + ERROR("DRTM: parameters structure is not " + DRTM_PAGE_SIZE_STR "-aligned\n"); + return INVALID_PARAMETERS; + } + + va_mapping_size = ALIGNED_UP(sizeof(struct_drtm_dl_args), DRTM_PAGE_SIZE); + + /* check DRTM parameters are within NS address region */ + rc = plat_drtm_validate_ns_region(x1, va_mapping_size); + if (rc != 0) { + ERROR("DRTM: parameters lies within secure memory\n"); + return INVALID_PARAMETERS; + } + + rc = mmap_add_dynamic_region_alloc_va(x1, &va_mapping, va_mapping_size, + MT_MEMORY | MT_NS | MT_RO | + MT_SHAREABILITY_ISH); + if (rc != 0) { + WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n", + __func__, rc); + return INTERNAL_ERROR; + } + a = (struct_drtm_dl_args *)va_mapping; + + /* Sanitize cache of data passed in args by the DCE Preamble. */ + flush_dcache_range(va_mapping, va_mapping_size); + + args_buf = *a; + + rc = mmap_remove_dynamic_region(va_mapping, va_mapping_size); + if (rc) { + ERROR("%s(): mmap_remove_dynamic_region() failed unexpectedly" + " rc=%d\n", __func__, rc); + panic(); + } + a = &args_buf; + + if (!((a->version >= ARM_DRTM_PARAMS_MIN_VERSION) && + (a->version <= ARM_DRTM_PARAMS_MAX_VERSION))) { + ERROR("DRTM: parameters structure version %u is unsupported\n", + a->version); + return NOT_SUPPORTED; + } + + if (!(a->dlme_img_off < a->dlme_size && + a->dlme_data_off < a->dlme_size)) { + ERROR("DRTM: argument offset is outside of the DLME region\n"); + return INVALID_PARAMETERS; + } + dlme_start = a->dlme_paddr; + dlme_end = a->dlme_paddr + a->dlme_size; + dlme_img_start = a->dlme_paddr + a->dlme_img_off; + dlme_img_ep = dlme_img_start + a->dlme_img_ep_off; + dlme_img_end = dlme_img_start + a->dlme_img_size; + dlme_data_start = a->dlme_paddr + a->dlme_data_off; + dlme_data_end = dlme_end; + + /* Check the DLME regions arguments. */ + if ((dlme_start % DRTM_PAGE_SIZE) != 0) { + ERROR("DRTM: argument DLME region is not " + DRTM_PAGE_SIZE_STR "-aligned\n"); + return INVALID_PARAMETERS; + } + + if (!(dlme_start < dlme_end && + dlme_start <= dlme_img_start && dlme_img_start < dlme_img_end && + dlme_start <= dlme_data_start && dlme_data_start < dlme_data_end)) { + ERROR("DRTM: argument DLME region is discontiguous\n"); + return INVALID_PARAMETERS; + } + + if (dlme_img_start < dlme_data_end && dlme_data_start < dlme_img_end) { + ERROR("DRTM: argument DLME regions overlap\n"); + return INVALID_PARAMETERS; + } + + /* Check the DLME image region arguments. */ + if ((dlme_img_start % DRTM_PAGE_SIZE) != 0) { + ERROR("DRTM: argument DLME image region is not " + DRTM_PAGE_SIZE_STR "-aligned\n"); + return INVALID_PARAMETERS; + } + + if (!(dlme_img_start <= dlme_img_ep && dlme_img_ep < dlme_img_end)) { + ERROR("DRTM: DLME entry point is outside of the DLME image region\n"); + return INVALID_PARAMETERS; + } + + if ((dlme_img_ep % 4) != 0) { + ERROR("DRTM: DLME image entry point is not 4-byte-aligned\n"); + return INVALID_PARAMETERS; + } + + /* Check the DLME data region arguments. */ + if ((dlme_data_start % DRTM_PAGE_SIZE) != 0) { + ERROR("DRTM: argument DLME data region is not " + DRTM_PAGE_SIZE_STR "-aligned\n"); + return INVALID_PARAMETERS; + } + + if (dlme_data_end - dlme_data_start < dlme_data_min_size) { + ERROR("DRTM: argument DLME data region is short of %lu bytes\n", + dlme_data_min_size - (size_t)(dlme_data_end - dlme_data_start)); + return INVALID_PARAMETERS; + } + + /* check DLME region (paddr + size) is within a NS address region */ + rc = plat_drtm_validate_ns_region(dlme_start, (size_t)a->dlme_size); + if (rc != 0) { + ERROR("DRTM: DLME region lies within secure memory\n"); + return INVALID_PARAMETERS; + } + + /* Check the Normal World DCE region arguments. */ + if (a->dce_nwd_paddr != 0) { + uint32_t dce_nwd_start = a->dce_nwd_paddr; + uint32_t dce_nwd_end = dce_nwd_start + a->dce_nwd_size; + + if (!(dce_nwd_start < dce_nwd_end)) { + ERROR("DRTM: argument Normal World DCE region is dicontiguous\n"); + return INVALID_PARAMETERS; + } + + if (dce_nwd_start < dlme_end && dlme_start < dce_nwd_end) { + ERROR("DRTM: argument Normal World DCE regions overlap\n"); + return INVALID_PARAMETERS; + } + } + + /* + * Map and sanitize the cache of data range passed by DCE Preamble. This + * is required to avoid / defend against racing with cache evictions + */ + va_mapping_size = ALIGNED_UP((dlme_end - dlme_start), DRTM_PAGE_SIZE); + rc = mmap_add_dynamic_region_alloc_va(dlme_img_start, &va_mapping, va_mapping_size, + MT_MEMORY | MT_NS | MT_RO | + MT_SHAREABILITY_ISH); + if (rc != 0) { + ERROR("DRTM: %s: mmap_add_dynamic_region_alloc_va() failed rc=%d\n", + __func__, rc); + return INTERNAL_ERROR; + } + flush_dcache_range(va_mapping, va_mapping_size); + + rc = mmap_remove_dynamic_region(va_mapping, va_mapping_size); + if (rc) { + ERROR("%s(): mmap_remove_dynamic_region() failed unexpectedly" + " rc=%d\n", __func__, rc); + panic(); + } + + *a_out = *a; + return SUCCESS; +} + +static void drtm_dl_reset_dlme_el_state(enum drtm_dlme_el dlme_el) +{ + uint64_t sctlr; + + /* + * TODO: Set PE state according to the PSCI's specification of the initial + * state after CPU_ON, or to reset values if unspecified, where they exist, + * or define sensible values otherwise. + */ + + switch (dlme_el) { + case DLME_AT_EL1: + sctlr = read_sctlr_el1(); + break; + + case DLME_AT_EL2: + sctlr = read_sctlr_el2(); + break; + + default: /* Not reached */ + ERROR("%s(): dlme_el has the unexpected value %d\n", + __func__, dlme_el); + panic(); + } + + sctlr &= ~(/* Disable DLME's EL MMU, since the existing page-tables are untrusted. */ + SCTLR_M_BIT + | SCTLR_EE_BIT /* Little-endian data accesses. */ + ); + + sctlr |= SCTLR_C_BIT | SCTLR_I_BIT; /* Allow instruction and data caching. */ + + switch (dlme_el) { + case DLME_AT_EL1: + write_sctlr_el1(sctlr); + break; + + case DLME_AT_EL2: + write_sctlr_el2(sctlr); + break; + } +} + +static void drtm_dl_reset_dlme_context(enum drtm_dlme_el dlme_el) +{ + void *ns_ctx = cm_get_context(NON_SECURE); + gp_regs_t *gpregs = get_gpregs_ctx(ns_ctx); + uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ns_ctx), CTX_SPSR_EL3); + + /* Reset all gpregs, including SP_EL0. */ + memset(gpregs, 0, sizeof(*gpregs)); + + /* Reset SP_ELx. */ + switch (dlme_el) { + case DLME_AT_EL1: + write_sp_el1(0); + break; + + case DLME_AT_EL2: + write_sp_el2(0); + break; + } + + /* + * DLME's async exceptions are masked to avoid a NWd attacker's timed + * interference with any state we established trust in or measured. + */ + spsr_el3 |= SPSR_DAIF_MASK << SPSR_DAIF_SHIFT; + + write_ctx_reg(get_el3state_ctx(ns_ctx), CTX_SPSR_EL3, spsr_el3); +} + +static void drtm_dl_prepare_eret_to_dlme(const struct_drtm_dl_args *args, enum drtm_dlme_el dlme_el) +{ + void *ctx = cm_get_context(NON_SECURE); + uint64_t dlme_ep = DL_ARGS_GET_DLME_ENTRY_POINT(args); + uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ctx), CTX_SPSR_EL3); + + /* Next ERET is to the DLME's EL. */ + spsr_el3 &= ~(MODE_EL_MASK << MODE_EL_SHIFT); + switch (dlme_el) { + case DLME_AT_EL1: + spsr_el3 |= MODE_EL1 << MODE_EL_SHIFT; + break; + + case DLME_AT_EL2: + spsr_el3 |= MODE_EL2 << MODE_EL_SHIFT; + break; + } + + /* Next ERET is to the DLME entry point. */ + cm_set_elr_spsr_el3(NON_SECURE, dlme_ep, spsr_el3); +} + +static uint64_t drtm_dynamic_launch(uint64_t x1, void *handle) +{ + enum drtm_retc ret = SUCCESS; + enum drtm_retc dma_prot_ret; + struct_drtm_dl_args args; + /* DLME should be highest NS exception level */ + enum drtm_dlme_el dlme_el = (el_implemented(2) != EL_IMPL_NONE) ? MODE_EL2 : MODE_EL1; + + /* Ensure that only boot PE is powered on */ + ret = drtm_dl_check_cores(); + if (ret != SUCCESS) { + SMC_RET1(handle, ret); + } + + /* + * Ensure that execution state is AArch64 and the caller + * is highest non-secure exception level + */ + ret = drtm_dl_check_caller_el(handle); + if (ret != SUCCESS) { + SMC_RET1(handle, ret); + } + + ret = drtm_dl_check_args(x1, &args); + if (ret != SUCCESS) { + SMC_RET1(handle, ret); + } + + /* Ensure that there are no SDEI event registered */ +#if SDEI_SUPPORT + if (sdei_get_registered_event_count() != 0) { + SMC_RET1(handle, DENIED); + } +#endif /* SDEI_SUPPORT */ + + /* + * Engage the DMA protections. The launch cannot proceed without the DMA + * protections due to potential TOC/TOU vulnerabilities w.r.t. the DLME + * region (and to the NWd DCE region). + */ + ret = drtm_dma_prot_engage(&args.dma_prot_args, + DL_ARGS_GET_DMA_PROT_TYPE(&args)); + if (ret != SUCCESS) { + SMC_RET1(handle, ret); + } + + /* + * The DMA protection is now engaged. Note that any failure mode that + * returns an error to the DRTM-launch caller must now disengage DMA + * protections before returning to the caller. + */ + + ret = drtm_take_measurements(&args); + if (ret != SUCCESS) { + goto err_undo_dma_prot; + } + + ret = drtm_dl_prepare_dlme_data(&args); + if (ret != SUCCESS) { + goto err_undo_dma_prot; + } + + /* + * Note that, at the time of writing, the DRTM spec allows a successful + * launch from NS-EL1 to return to a DLME in NS-EL2. The practical risk + * of a privilege escalation, e.g. due to a compromised hypervisor, is + * considered small enough not to warrant the specification of additional + * DRTM conduits that would be necessary to maintain OSs' abstraction from + * the presence of EL2 were the dynamic launch only be allowed from the + * highest NS EL. + */ + + dlme_el = (el_implemented(2) != EL_IMPL_NONE) ? MODE_EL2 : MODE_EL1; + + drtm_dl_reset_dlme_el_state(dlme_el); + drtm_dl_reset_dlme_context(dlme_el); + + drtm_dl_prepare_eret_to_dlme(&args, dlme_el); + + /* + * As per DRTM beta0 spec table #28 invalidate the instruction cache + * before jumping to the DLME. This is required to defend against + * potentially-malicious cache contents. + */ + invalidate_icache_all(); + + /* Return the DLME region's address in x0, and the DLME data offset in x1.*/ + SMC_RET2(handle, args.dlme_paddr, args.dlme_data_off); + +err_undo_dma_prot: + dma_prot_ret = drtm_dma_prot_disengage(); + if (dma_prot_ret != SUCCESS) { + ERROR("%s(): drtm_dma_prot_disengage() failed unexpectedly" + " rc=%d\n", __func__, ret); + panic(); + } + + SMC_RET1(handle, ret); +} + +uint64_t drtm_smc_handler(uint32_t smc_fid, + uint64_t x1, + uint64_t x2, + uint64_t x3, + uint64_t x4, + void *cookie, + void *handle, + uint64_t flags) +{ + /* Check that the SMC call is from the Normal World. */ + if (!is_caller_non_secure(flags)) { + SMC_RET1(handle, NOT_SUPPORTED); + } + + switch (smc_fid) { + case ARM_DRTM_SVC_VERSION: + INFO("DRTM service handler: version\n"); + /* Return the version of current implementation */ + SMC_RET1(handle, ARM_DRTM_VERSION); + break; /* not reached */ + + case ARM_DRTM_SVC_FEATURES: + if (((x1 >> ARM_DRTM_FUNC_SHIFT) & ARM_DRTM_FUNC_MASK) == + ARM_DRTM_FUNC_ID) { + /* Dispatch function-based queries. */ + switch (x1 & FUNCID_MASK) { + case ARM_DRTM_SVC_VERSION: + SMC_RET1(handle, SUCCESS); + break; /* not reached */ + + case ARM_DRTM_SVC_FEATURES: + SMC_RET1(handle, SUCCESS); + break; /* not reached */ + + case ARM_DRTM_SVC_UNPROTECT_MEM: + SMC_RET1(handle, SUCCESS); + break; /* not reached */ + + case ARM_DRTM_SVC_DYNAMIC_LAUNCH: + SMC_RET1(handle, SUCCESS); + break; /* not reached */ + + case ARM_DRTM_SVC_CLOSE_LOCALITY: + WARN("ARM_DRTM_SVC_CLOSE_LOCALITY feature %s", + "is not supported\n"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + + case ARM_DRTM_SVC_GET_ERROR: + SMC_RET1(handle, SUCCESS); + break; /* not reached */ + + case ARM_DRTM_SVC_SET_ERROR: + SMC_RET1(handle, SUCCESS); + break; /* not reached */ + + case ARM_DRTM_SVC_SET_TCB_HASH: + WARN("ARM_DRTM_SVC_TCB_HASH feature %s", + "is not supported\n"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + + case ARM_DRTM_SVC_LOCK_TCB_HASH: + WARN("ARM_DRTM_SVC_LOCK_TCB_HASH feature %s", + "is not supported\n"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + + default: + ERROR("Unknown DRTM service function\n"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + } + } else { + /* Dispatch feature-based queries. */ + switch (x1 & ARM_DRTM_FEAT_ID_MASK) { + case ARM_DRTM_FEATURES_TPM: + INFO("++ DRTM service handler: TPM features\n"); + return drtm_features_tpm(handle); + break; /* not reached */ + + case ARM_DRTM_FEATURES_MEM_REQ: + INFO("++ DRTM service handler: Min. mem." + " requirement features\n"); + return drtm_features_mem_req(handle); + break; /* not reached */ + + case ARM_DRTM_FEATURES_DMA_PROT: + INFO("++ DRTM service handler: " + "DMA protection features\n"); + return drtm_features_dma_prot(handle); + break; /* not reached */ + + case ARM_DRTM_FEATURES_BOOT_PE_ID: + INFO("++ DRTM service handler: " + "Boot PE ID features\n"); + return drtm_features_boot_pe_id(handle); + break; /* not reached */ + + case ARM_DRTM_FEATURES_TCB_HASHES: + INFO("++ DRTM service handler: " + "TCB-hashes features\n"); + return drtm_features_tcb_hashes(handle); + break; /* not reached */ + + default: + ERROR("Unknown ARM DRTM service feature\n"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + } + } + + case ARM_DRTM_SVC_UNPROTECT_MEM: + INFO("DRTM service handler: unprotect mem\n"); + return drtm_unprotect_mem(handle); + break; /* not reached */ + + case ARM_DRTM_SVC_DYNAMIC_LAUNCH: + INFO("DRTM service handler: dynamic launch\n"); + return drtm_dynamic_launch(x1, handle); + break; /* not reached */ + + case ARM_DRTM_SVC_CLOSE_LOCALITY: + WARN("DRTM service handler: close locality %s\n", + "is not supported"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + + case ARM_DRTM_SVC_GET_ERROR: + INFO("DRTM service handler: get error\n"); + drtm_get_error(handle); + break; /* not reached */ + + case ARM_DRTM_SVC_SET_ERROR: + INFO("DRTM service handler: set error\n"); + drtm_set_error(x1, handle); + break; /* not reached */ + + case ARM_DRTM_SVC_SET_TCB_HASH: + WARN("DRTM service handler: set TCB hash %s\n", + "is not supported"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + + case ARM_DRTM_SVC_LOCK_TCB_HASH: + WARN("DRTM service handler: lock TCB hash %s\n", + "is not supported"); + SMC_RET1(handle, NOT_SUPPORTED); + break; /* not reached */ + + default: + ERROR("Unknown DRTM service function: 0x%x\n", smc_fid); + SMC_RET1(handle, SMC_UNK); + break; /* not reached */ + } + + /* not reached */ + SMC_RET1(handle, SMC_UNK); +} diff --git a/services/std_svc/drtm/drtm_main.h b/services/std_svc/drtm/drtm_main.h new file mode 100644 index 0000000..6005163 --- /dev/null +++ b/services/std_svc/drtm/drtm_main.h @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + */ +#ifndef DRTM_MAIN_H +#define DRTM_MAIN_H + +#include <stdint.h> + +#include <assert.h> +#include <lib/smccc.h> + +#include "drtm_dma_prot.h" + +#define ALIGNED_UP(x, a) __extension__ ({ \ + __typeof__(a) _a = (a); \ + __typeof__(a) _one = 1; \ + assert(IS_POWER_OF_TWO(_a)); \ + ((x) + (_a - _one)) & ~(_a - _one); \ +}) + +#define ALIGNED_DOWN(x, a) __extension__ ({ \ + __typeof__(a) _a = (a); \ + __typeof__(a) _one = 1; \ + assert(IS_POWER_OF_TWO(_a)); \ + (x) & ~(_a - _one); \ +}) + +#define DRTM_PAGE_SIZE (4 * (1 << 10)) +#define DRTM_PAGE_SIZE_STR "4-KiB" + +#define DL_ARGS_GET_DMA_PROT_TYPE(a) (((a)->features >> 3) & 0x7U) +#define DL_ARGS_GET_PCR_SCHEMA(a) (((a)->features >> 1) & 0x3U) +#define DL_ARGS_GET_DLME_ENTRY_POINT(a) \ + (((a)->dlme_paddr + (a)->dlme_img_off + (a)->dlme_img_ep_off)) + +/* + * Range(Min/Max) of DRTM parameter structure versions supported + */ +#define ARM_DRTM_PARAMS_MIN_VERSION U(1) +#define ARM_DRTM_PARAMS_MAX_VERSION U(1) + +enum drtm_dlme_el { + DLME_AT_EL1 = MODE_EL1, + DLME_AT_EL2 = MODE_EL2 +}; + +enum drtm_retc { + SUCCESS = SMC_OK, + NOT_SUPPORTED = SMC_UNK, + INVALID_PARAMETERS = -2, + DENIED = -3, + NOT_FOUND = -4, + INTERNAL_ERROR = -5, + MEM_PROTECT_INVALID = -6, +}; + +typedef struct { + uint64_t tpm_features; + uint64_t minimum_memory_requirement; + uint64_t dma_prot_features; + uint64_t boot_pe_id; + uint64_t tcb_hash_features; +} drtm_features_t; + +struct __packed drtm_dl_args_v1 { + uint16_t version; /* Must be 1. */ + uint8_t __res[2]; + uint32_t features; + uint64_t dlme_paddr; + uint64_t dlme_size; + uint64_t dlme_img_off; + uint64_t dlme_img_ep_off; + uint64_t dlme_img_size; + uint64_t dlme_data_off; + uint64_t dce_nwd_paddr; + uint64_t dce_nwd_size; + drtm_dl_dma_prot_args_v1_t dma_prot_args; +} __aligned(__alignof(uint16_t /* First member's type, `uint16_t version' */)); + +struct __packed dlme_data_header_v1 { + uint16_t version; /* Must be 1. */ + uint16_t this_hdr_size; + uint8_t __res[4]; + uint64_t dlme_data_size; + uint64_t dlme_prot_regions_size; + uint64_t dlme_addr_map_size; + uint64_t dlme_tpm_log_size; + uint64_t dlme_tcb_hashes_table_size; + uint64_t dlme_impdef_region_size; +} __aligned(__alignof(uint16_t /* First member's type, `uint16_t version'. */)); + +typedef struct dlme_data_header_v1 struct_dlme_data_header; + +drtm_memory_region_descriptor_table_t *drtm_build_address_map(void); +uint64_t drtm_get_address_map_size(void); + +/* + * Version-independent type. May be used to avoid excessive line of code + * changes when migrating to new struct versions. + */ +typedef struct drtm_dl_args_v1 struct_drtm_dl_args; + +#endif /* DRTM_MAIN_H */ diff --git a/services/std_svc/drtm/drtm_measurements.c b/services/std_svc/drtm/drtm_measurements.c new file mode 100644 index 0000000..a8f2b32 --- /dev/null +++ b/services/std_svc/drtm/drtm_measurements.c @@ -0,0 +1,214 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + * DRTM measurements into TPM PCRs. + * + * Authors: + * Lucian Paul-Trifu <lucian.paultrifu@gmail.com> + * + */ +#include <assert.h> + +#include <common/debug.h> +#include <drivers/auth/crypto_mod.h> +#include <drivers/measured_boot/event_log/event_log.h> +#include "drtm_main.h" +#include "drtm_measurements.h" +#include <lib/xlat_tables/xlat_tables_v2.h> + +/* Event Log buffer */ +static uint8_t drtm_event_log[PLAT_DRTM_EVENT_LOG_MAX_SIZE]; + +/* + * Calculate and write hash of various payloads as per DRTM specification + * to Event Log. + * + * @param[in] data_base Address of data + * @param[in] data_size Size of data + * @param[in] event_type Type of Event + * @param[in] event_name Name of the Event + * @return: + * 0 = success + * < 0 = error + */ +static int drtm_event_log_measure_and_record(uintptr_t data_base, + uint32_t data_size, + uint32_t event_type, + const char *event_name, + unsigned int pcr) +{ + int rc; + unsigned char hash_data[CRYPTO_MD_MAX_SIZE]; + event_log_metadata_t metadata = {0}; + + metadata.name = event_name; + metadata.pcr = pcr; + + /* + * Measure the payloads requested by D-CRTM and DCE commponents + * Hash algorithm decided by the Event Log driver at build-time + */ + rc = event_log_measure(data_base, data_size, hash_data); + if (rc != 0) { + return rc; + } + + /* Record the mesasurement in the EventLog buffer */ + event_log_record(hash_data, event_type, &metadata); + + return 0; +} + +/* + * Initialise Event Log global variables, used during the recording + * of various payload measurements into the Event Log buffer + * + * @param[in] event_log_start Base address of Event Log buffer + * @param[in] event_log_finish End address of Event Log buffer, + * it is a first byte past end of the + * buffer + */ +static void drtm_event_log_init(uint8_t *event_log_start, + uint8_t *event_log_finish) +{ + event_log_buf_init(event_log_start, event_log_finish); + event_log_write_specid_event(); +} + +enum drtm_retc drtm_take_measurements(const struct_drtm_dl_args *a) +{ + int rc; + uintptr_t dlme_img_mapping; + uint64_t dlme_img_ep; + size_t dlme_img_mapping_bytes; + uint8_t drtm_null_data = 0U; + uint8_t pcr_schema = DL_ARGS_GET_PCR_SCHEMA(a); + const char *drtm_event_arm_sep_data = "ARM_DRTM"; + + /* Initialise the EventLog driver */ + drtm_event_log_init(drtm_event_log, drtm_event_log + + sizeof(drtm_event_log)); + + /** + * Measurements extended into PCR-17. + * + * PCR-17: Measure the DCE image. Extend digest of (char)0 into PCR-17 + * since the D-CRTM and the DCE are not separate. + */ + rc = drtm_event_log_measure_and_record((uintptr_t)&drtm_null_data, + sizeof(drtm_null_data), + DRTM_EVENT_ARM_DCE, NULL, + PCR_17); + CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DCE)); + + /* PCR-17: Measure the PCR schema DRTM launch argument. */ + rc = drtm_event_log_measure_and_record((uintptr_t)&pcr_schema, + sizeof(pcr_schema), + DRTM_EVENT_ARM_PCR_SCHEMA, + NULL, PCR_17); + CHECK_RC(rc, + drtm_event_log_measure_and_record(DRTM_EVENT_ARM_PCR_SCHEMA)); + + /* PCR-17: Measure the enable state of external-debug, and trace. */ + /* + * TODO: Measure the enable state of external-debug and trace. This should + * be returned through a platform-specific hook. + */ + + /* PCR-17: Measure the security lifecycle state. */ + /* + * TODO: Measure the security lifecycle state. This is an implementation- + * defined value, retrieved through an implementation-defined mechanisms. + */ + + /* + * PCR-17: Optionally measure the NWd DCE. + * It is expected that such subsequent DCE stages are signed and verified. + * Whether they are measured in addition to signing is implementation + * -defined. + * Here the choice is to not measure any NWd DCE, in favour of PCR value + * resilience to any NWd DCE updates. + */ + + /* PCR-17: End of DCE measurements. */ + rc = drtm_event_log_measure_and_record((uintptr_t)drtm_event_arm_sep_data, + strlen(drtm_event_arm_sep_data), + DRTM_EVENT_ARM_SEPARATOR, NULL, + PCR_17); + CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_SEPARATOR)); + + /** + * Measurements extended into PCR-18. + * + * PCR-18: Measure the PCR schema DRTM launch argument. + */ + rc = drtm_event_log_measure_and_record((uintptr_t)&pcr_schema, + sizeof(pcr_schema), + DRTM_EVENT_ARM_PCR_SCHEMA, + NULL, PCR_18); + CHECK_RC(rc, + drtm_event_log_measure_and_record(DRTM_EVENT_ARM_PCR_SCHEMA)); + + /* + * PCR-18: Measure the public key used to verify DCE image(s) signatures. + * Extend digest of (char)0, since we do not expect the NWd DCE to be + * present. + */ + assert(a->dce_nwd_size == 0); + rc = drtm_event_log_measure_and_record((uintptr_t)&drtm_null_data, + sizeof(drtm_null_data), + DRTM_EVENT_ARM_DCE_PUBKEY, + NULL, PCR_18); + CHECK_RC(rc, + drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DCE_PUBKEY)); + + /* PCR-18: Measure the DLME image. */ + dlme_img_mapping_bytes = page_align(a->dlme_img_size, UP); + rc = mmap_add_dynamic_region_alloc_va(a->dlme_paddr + a->dlme_img_off, + &dlme_img_mapping, + dlme_img_mapping_bytes, MT_RO_DATA | MT_NS); + if (rc) { + WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n", + __func__, rc); + return INTERNAL_ERROR; + } + + rc = drtm_event_log_measure_and_record(dlme_img_mapping, a->dlme_img_size, + DRTM_EVENT_ARM_DLME, NULL, + PCR_18); + CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DLME)); + + rc = mmap_remove_dynamic_region(dlme_img_mapping, dlme_img_mapping_bytes); + CHECK_RC(rc, mmap_remove_dynamic_region); + + /* PCR-18: Measure the DLME image entry point. */ + dlme_img_ep = DL_ARGS_GET_DLME_ENTRY_POINT(a); + drtm_event_log_measure_and_record((uintptr_t)&dlme_img_ep, + sizeof(dlme_img_ep), + DRTM_EVENT_ARM_DLME_EP, NULL, + PCR_18); + CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DLME_EP)); + + /* PCR-18: End of DCE measurements. */ + rc = drtm_event_log_measure_and_record((uintptr_t)drtm_event_arm_sep_data, + strlen(drtm_event_arm_sep_data), + DRTM_EVENT_ARM_SEPARATOR, NULL, + PCR_18); + CHECK_RC(rc, + drtm_event_log_measure_and_record(DRTM_EVENT_ARM_SEPARATOR)); + /* + * If the DCE is unable to log a measurement because there is no available + * space in the event log region, the DCE must extend a hash of the value + * 0xFF (1 byte in size) into PCR[17] and PCR[18] and enter remediation. + */ + + return SUCCESS; +} + +void drtm_serialise_event_log(uint8_t *dst, size_t *event_log_size_out) +{ + *event_log_size_out = event_log_get_cur_size(drtm_event_log); + memcpy(dst, drtm_event_log, *event_log_size_out); +} diff --git a/services/std_svc/drtm/drtm_measurements.h b/services/std_svc/drtm/drtm_measurements.h new file mode 100644 index 0000000..6d7a84e --- /dev/null +++ b/services/std_svc/drtm/drtm_measurements.h @@ -0,0 +1,40 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + */ +#ifndef DRTM_MEASUREMENTS_H +#define DRTM_MEASUREMENTS_H + +#include <stdint.h> + +#include "drtm_main.h" +#include <platform_def.h> + +#define DRTM_EVENT_ARM_BASE 0x9000U +#define DRTM_EVENT_TYPE(n) (DRTM_EVENT_ARM_BASE + (unsigned int)(n)) + +#define DRTM_EVENT_ARM_PCR_SCHEMA DRTM_EVENT_TYPE(1) +#define DRTM_EVENT_ARM_DCE DRTM_EVENT_TYPE(2) +#define DRTM_EVENT_ARM_DCE_PUBKEY DRTM_EVENT_TYPE(3) +#define DRTM_EVENT_ARM_DLME DRTM_EVENT_TYPE(4) +#define DRTM_EVENT_ARM_DLME_EP DRTM_EVENT_TYPE(5) +#define DRTM_EVENT_ARM_DEBUG_CONFIG DRTM_EVENT_TYPE(6) +#define DRTM_EVENT_ARM_NONSECURE_CONFIG DRTM_EVENT_TYPE(7) +#define DRTM_EVENT_ARM_DCE_SECONDARY DRTM_EVENT_TYPE(8) +#define DRTM_EVENT_ARM_TZFW DRTM_EVENT_TYPE(9) +#define DRTM_EVENT_ARM_SEPARATOR DRTM_EVENT_TYPE(10) + +#define CHECK_RC(rc, func_call) { \ + if (rc != 0) { \ + ERROR("%s(): " #func_call "failed unexpectedly rc=%d\n", \ + __func__, rc); \ + panic(); \ + } \ +} + +enum drtm_retc drtm_take_measurements(const struct_drtm_dl_args *a); +void drtm_serialise_event_log(uint8_t *dst, size_t *event_log_size_out); + +#endif /* DRTM_MEASUREMENTS_H */ diff --git a/services/std_svc/drtm/drtm_remediation.c b/services/std_svc/drtm/drtm_remediation.c new file mode 100644 index 0000000..696b4ea --- /dev/null +++ b/services/std_svc/drtm/drtm_remediation.c @@ -0,0 +1,59 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + * DRTM support for DRTM error remediation. + * + */ +#include <inttypes.h> +#include <stdint.h> + +#include <common/debug.h> +#include <common/runtime_svc.h> +#include "drtm_main.h" +#include <plat/common/platform.h> + +uint64_t drtm_set_error(uint64_t x1, void *ctx) +{ + int rc; + + rc = plat_set_drtm_error(x1); + + if (rc != 0) { + SMC_RET1(ctx, INTERNAL_ERROR); + } + + SMC_RET1(ctx, SUCCESS); +} + +uint64_t drtm_get_error(void *ctx) +{ + uint64_t error_code; + int rc; + + rc = plat_get_drtm_error(&error_code); + + if (rc != 0) { + SMC_RET1(ctx, INTERNAL_ERROR); + } + + SMC_RET2(ctx, SUCCESS, error_code); +} + +void drtm_enter_remediation(uint64_t err_code, const char *err_str) +{ + int rc = plat_set_drtm_error(err_code); + + if (rc != 0) { + ERROR("%s(): drtm_error_set() failed unexpectedly rc=%d\n", + __func__, rc); + panic(); + } + + ERROR("DRTM: entering remediation of error:\n%" PRIu64 "\t\'%s\'\n", + err_code, err_str); + + ERROR("%s(): system reset is not yet supported\n", __func__); + plat_system_reset(); +} diff --git a/services/std_svc/drtm/drtm_remediation.h b/services/std_svc/drtm/drtm_remediation.h new file mode 100644 index 0000000..8f965f1 --- /dev/null +++ b/services/std_svc/drtm/drtm_remediation.h @@ -0,0 +1,15 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + */ +#ifndef DRTM_REMEDIATION_H +#define DRTM_REMEDIATION_H + +uint64_t drtm_set_error(uint64_t x1, void *ctx); +uint64_t drtm_get_error(void *ctx); + +void drtm_enter_remediation(uint64_t error_code, const char *error_str); + +#endif /* DRTM_REMEDIATION_H */ diff --git a/services/std_svc/drtm/drtm_res_address_map.c b/services/std_svc/drtm/drtm_res_address_map.c new file mode 100644 index 0000000..8636706 --- /dev/null +++ b/services/std_svc/drtm/drtm_res_address_map.c @@ -0,0 +1,88 @@ +/* + * Copyright (c) 2022 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <stdint.h> + +#include <plat/common/platform.h> +#include <services/drtm_svc.h> +#include <platform_def.h> + +/* Address map revision generated by this code. */ +#define DRTM_ADDRESS_MAP_REVISION U(0x0001) + +/* Amount of space needed for address map based on PLAT_DRTM_MMAP_ENTRIES */ +#define DRTM_ADDRESS_MAP_SIZE (sizeof(drtm_memory_region_descriptor_table_t) + \ + (sizeof(drtm_mem_region_t) * \ + PLAT_DRTM_MMAP_ENTRIES)) + +/* Allocate space for DRTM-formatted address map to be constructed. */ +static uint8_t drtm_address_map[DRTM_ADDRESS_MAP_SIZE]; + +static uint64_t drtm_address_map_size; + +drtm_memory_region_descriptor_table_t *drtm_build_address_map(void) +{ + /* Set up pointer to DRTM memory map. */ + drtm_memory_region_descriptor_table_t *map = + (drtm_memory_region_descriptor_table_t *)drtm_address_map; + + /* Get the platform memory map. */ + const mmap_region_t *mmap = plat_get_addr_mmap(); + unsigned int i; + + /* Set up header for address map structure. */ + map->revision = DRTM_ADDRESS_MAP_REVISION; + map->reserved = 0x0000; + + /* Iterate through mmap and generate DRTM address map. */ + for (i = 0U; mmap[i].base_pa != 0UL; i++) { + /* Set PA of region. */ + map->region[i].region_address = mmap[i].base_pa; + + /* Set size of region (in 4kb chunks). */ + map->region[i].region_size_type = 0; + ARM_DRTM_REGION_SIZE_TYPE_SET_4K_PAGE_NUM( + map->region[i].region_size_type, + mmap[i].size / PAGE_SIZE_4KB); + + /* Set type and cacheability. */ + switch (MT_TYPE(mmap[i].attr)) { + case MT_DEVICE: + ARM_DRTM_REGION_SIZE_TYPE_SET_REGION_TYPE( + map->region[i].region_size_type, + ARM_DRTM_REGION_SIZE_TYPE_REGION_TYPE_DEVICE); + break; + case MT_NON_CACHEABLE: + ARM_DRTM_REGION_SIZE_TYPE_SET_REGION_TYPE( + map->region[i].region_size_type, + ARM_DRTM_REGION_SIZE_TYPE_REGION_TYPE_NCAR); + ARM_DRTM_REGION_SIZE_TYPE_SET_CACHEABILITY( + map->region[i].region_size_type, + ARM_DRTM_REGION_SIZE_TYPE_CACHEABILITY_NC); + break; + case MT_MEMORY: + ARM_DRTM_REGION_SIZE_TYPE_SET_REGION_TYPE( + map->region[i].region_size_type, + ARM_DRTM_REGION_SIZE_TYPE_REGION_TYPE_NORMAL); + break; + default: + return NULL; + } + } + + map->num_regions = i; + + /* Store total size of address map. */ + drtm_address_map_size = sizeof(drtm_memory_region_descriptor_table_t); + drtm_address_map_size += (i * sizeof(drtm_mem_region_t)); + + return map; +} + +uint64_t drtm_get_address_map_size(void) +{ + return drtm_address_map_size; +} |