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cmd/optee_rpmb.c
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// SPDX-License-Identifier: GPL-2.0+ /* * Copyright 2020 NXP */ #include <command.h> #include <common.h> #include <env.h> #include <errno.h> #include <image.h> #include <malloc.h> #include <mmc.h> #include <tee.h> #include <tee/optee_ta_avb.h> static struct udevice *tee; static u32 session; static int avb_ta_open_session(void) { const struct tee_optee_ta_uuid uuid = TA_AVB_UUID; struct tee_open_session_arg arg; int rc; tee = tee_find_device(tee, NULL, NULL, NULL); if (!tee) return -ENODEV; memset(&arg, 0, sizeof(arg)); tee_optee_ta_uuid_to_octets(arg.uuid, &uuid); rc = tee_open_session(tee, &arg, 0, NULL); if (!rc) session = arg.session; return 0; } static int invoke_func(u32 func, ulong num_param, struct tee_param *param) { struct tee_invoke_arg arg; if (!tee) if (avb_ta_open_session()) return -ENODEV; memset(&arg, 0, sizeof(arg)); arg.func = func; arg.session = session; if (tee_invoke_func(tee, &arg, num_param, param)) return -EFAULT; switch (arg.ret) { case TEE_SUCCESS: return 0; case TEE_ERROR_OUT_OF_MEMORY: case TEE_ERROR_STORAGE_NO_SPACE: return -ENOSPC; case TEE_ERROR_ITEM_NOT_FOUND: return -EIO; case TEE_ERROR_TARGET_DEAD: /* * The TA has paniced, close the session to reload the TA * for the next request. */ tee_close_session(tee, session); tee = NULL; return -EIO; default: return -EIO; } } static int read_persistent_value(const char *name, size_t buffer_size, u8 *out_buffer, size_t *out_num_bytes_read) { int rc = 0; struct tee_shm *shm_name; struct tee_shm *shm_buf; struct tee_param param[2]; size_t name_size = strlen(name) + 1; if (!tee) if (avb_ta_open_session()) return -ENODEV; rc = tee_shm_alloc(tee, name_size, TEE_SHM_ALLOC, &shm_name); if (rc) return -ENOMEM; rc = tee_shm_alloc(tee, buffer_size, TEE_SHM_ALLOC, &shm_buf); if (rc) { rc = -ENOMEM; goto free_name; } memcpy(shm_name->addr, name, name_size); memset(param, 0, sizeof(param)); param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT; param[0].u.memref.shm = shm_name; param[0].u.memref.size = name_size; param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT; param[1].u.memref.shm = shm_buf; param[1].u.memref.size = buffer_size; rc = invoke_func(TA_AVB_CMD_READ_PERSIST_VALUE, 2, param); if (rc) goto out; if (param[1].u.memref.size > buffer_size) { rc = -EINVAL; goto out; } *out_num_bytes_read = param[1].u.memref.size; memcpy(out_buffer, shm_buf->addr, *out_num_bytes_read); out: tee_shm_free(shm_buf); free_name: tee_shm_free(shm_name); return rc; } static int write_persistent_value(const char *name, size_t value_size, const u8 *value) { int rc = 0; struct tee_shm *shm_name; struct tee_shm *shm_buf; struct tee_param param[2]; size_t name_size = strlen(name) + 1; if (!tee) { if (avb_ta_open_session()) return -ENODEV; } if (!value_size) return -EINVAL; rc = tee_shm_alloc(tee, name_size, TEE_SHM_ALLOC, &shm_name); if (rc) return -ENOMEM; rc = tee_shm_alloc(tee, value_size, TEE_SHM_ALLOC, &shm_buf); if (rc) { rc = -ENOMEM; goto free_name; } memcpy(shm_name->addr, name, name_size); memcpy(shm_buf->addr, value, value_size); memset(param, 0, sizeof(param)); param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT; param[0].u.memref.shm = shm_name; param[0].u.memref.size = name_size; param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT; param[1].u.memref.shm = shm_buf; param[1].u.memref.size = value_size; rc = invoke_func(TA_AVB_CMD_WRITE_PERSIST_VALUE, 2, param); if (rc) goto out; out: tee_shm_free(shm_buf); free_name: tee_shm_free(shm_name); return rc; } int do_optee_rpmb_read(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]) { const char *name; size_t bytes; size_t bytes_read; void *buffer; char *endp; if (argc != 3) return CMD_RET_USAGE; name = argv[1]; |
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bytes = dectoul(argv[2], &endp); |
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if (*endp && *endp != ' ') return CMD_RET_USAGE; buffer = malloc(bytes); if (!buffer) return CMD_RET_FAILURE; if (read_persistent_value(name, bytes, buffer, &bytes_read) == 0) { printf("Read %zu bytes, value = %s ", bytes_read, (char *)buffer); free(buffer); return CMD_RET_SUCCESS; } printf("Failed to read persistent value "); free(buffer); return CMD_RET_FAILURE; } int do_optee_rpmb_write(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]) { const char *name; const char *value; if (argc != 3) return CMD_RET_USAGE; name = argv[1]; value = argv[2]; if (write_persistent_value(name, strlen(value) + 1, (const uint8_t *)value) == 0) { printf("Wrote %zu bytes ", strlen(value) + 1); return CMD_RET_SUCCESS; } printf("Failed to write persistent value "); return CMD_RET_FAILURE; } static struct cmd_tbl cmd_optee_rpmb[] = { U_BOOT_CMD_MKENT(read_pvalue, 3, 0, do_optee_rpmb_read, "", ""), U_BOOT_CMD_MKENT(write_pvalue, 3, 0, do_optee_rpmb_write, "", ""), }; static int do_optee_rpmb(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]) { struct cmd_tbl *cp; cp = find_cmd_tbl(argv[1], cmd_optee_rpmb, ARRAY_SIZE(cmd_optee_rpmb)); argc--; argv++; if (!cp || argc > cp->maxargs) return CMD_RET_USAGE; if (flag == CMD_FLAG_REPEAT) return CMD_RET_FAILURE; return cp->cmd(cmdtp, flag, argc, argv); } U_BOOT_CMD ( optee_rpmb, 29, 0, do_optee_rpmb, "Provides commands for testing secure storage on RPMB on OPTEE", "read_pvalue <name> <bytes> - read a persistent value <name> " "optee_rpmb write_pvalue <name> <value> - write a persistent value <name> " ); |