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cmd/avb.c
11.1 KB
60b2f9e7b cmd: avb2.0: avb ... |
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/* * (C) Copyright 2018, Linaro Limited * * SPDX-License-Identifier: GPL-2.0+ */ #include <avb_verify.h> #include <command.h> |
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#include <env.h> |
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#include <image.h> #include <malloc.h> #include <mmc.h> #define AVB_BOOTARGS "avb_bootargs" static struct AvbOps *avb_ops; |
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int do_avb_init(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unsigned long mmc_dev; if (argc != 2) return CMD_RET_USAGE; mmc_dev = simple_strtoul(argv[1], NULL, 16); if (avb_ops) avb_ops_free(avb_ops); avb_ops = avb_ops_alloc(mmc_dev); if (avb_ops) return CMD_RET_SUCCESS; |
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printf("Failed to initialize avb2 "); |
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return CMD_RET_FAILURE; } int do_avb_read_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const char *part; s64 offset; size_t bytes, bytes_read = 0; void *buffer; if (!avb_ops) { printf("AVB 2.0 is not initialized, please run 'avb init' "); return CMD_RET_USAGE; } if (argc != 5) return CMD_RET_USAGE; part = argv[1]; offset = simple_strtoul(argv[2], NULL, 16); bytes = simple_strtoul(argv[3], NULL, 16); buffer = (void *)simple_strtoul(argv[4], NULL, 16); if (avb_ops->read_from_partition(avb_ops, part, offset, bytes, buffer, &bytes_read) == AVB_IO_RESULT_OK) { printf("Read %zu bytes ", bytes_read); return CMD_RET_SUCCESS; } |
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printf("Failed to read from partition "); |
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return CMD_RET_FAILURE; } int do_avb_read_part_hex(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) { const char *part; s64 offset; size_t bytes, bytes_read = 0; char *buffer; if (!avb_ops) { printf("AVB 2.0 is not initialized, please run 'avb init' "); return CMD_RET_USAGE; } if (argc != 4) return CMD_RET_USAGE; part = argv[1]; offset = simple_strtoul(argv[2], NULL, 16); bytes = simple_strtoul(argv[3], NULL, 16); buffer = malloc(bytes); if (!buffer) { printf("Failed to tlb_allocate buffer for data "); return CMD_RET_FAILURE; } memset(buffer, 0, bytes); if (avb_ops->read_from_partition(avb_ops, part, offset, bytes, buffer, &bytes_read) == AVB_IO_RESULT_OK) { printf("Requested %zu, read %zu bytes ", bytes, bytes_read); printf("Data: "); for (int i = 0; i < bytes_read; i++) printf("%02X", buffer[i]); printf(" "); free(buffer); return CMD_RET_SUCCESS; } |
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printf("Failed to read from partition "); |
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free(buffer); return CMD_RET_FAILURE; } int do_avb_write_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const char *part; s64 offset; size_t bytes; void *buffer; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 5) return CMD_RET_USAGE; part = argv[1]; offset = simple_strtoul(argv[2], NULL, 16); bytes = simple_strtoul(argv[3], NULL, 16); buffer = (void *)simple_strtoul(argv[4], NULL, 16); if (avb_ops->write_to_partition(avb_ops, part, offset, bytes, buffer) == AVB_IO_RESULT_OK) { printf("Wrote %zu bytes ", bytes); return CMD_RET_SUCCESS; } |
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printf("Failed to write in partition "); |
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return CMD_RET_FAILURE; } int do_avb_read_rb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { size_t index; u64 rb_idx; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 2) return CMD_RET_USAGE; index = (size_t)simple_strtoul(argv[1], NULL, 16); if (avb_ops->read_rollback_index(avb_ops, index, &rb_idx) == AVB_IO_RESULT_OK) { |
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printf("Rollback index: %llx ", rb_idx); |
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return CMD_RET_SUCCESS; } |
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printf("Failed to read rollback index "); |
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return CMD_RET_FAILURE; } int do_avb_write_rb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { size_t index; u64 rb_idx; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 3) return CMD_RET_USAGE; index = (size_t)simple_strtoul(argv[1], NULL, 16); rb_idx = simple_strtoul(argv[2], NULL, 16); if (avb_ops->write_rollback_index(avb_ops, index, rb_idx) == AVB_IO_RESULT_OK) return CMD_RET_SUCCESS; |
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printf("Failed to write rollback index "); |
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return CMD_RET_FAILURE; } int do_avb_get_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const char *part; char buffer[UUID_STR_LEN + 1]; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 2) return CMD_RET_USAGE; part = argv[1]; if (avb_ops->get_unique_guid_for_partition(avb_ops, part, buffer, UUID_STR_LEN + 1) == AVB_IO_RESULT_OK) { printf("'%s' UUID: %s ", part, buffer); return CMD_RET_SUCCESS; } |
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printf("Failed to read UUID "); |
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return CMD_RET_FAILURE; } int do_avb_verify_part(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) { |
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const char * const requested_partitions[] = {"boot", NULL}; |
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AvbSlotVerifyResult slot_result; AvbSlotVerifyData *out_data; |
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char *cmdline; char *extra_args; |
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char *slot_suffix = ""; |
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bool unlocked = false; int res = CMD_RET_FAILURE; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } |
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if (argc < 1 || argc > 2) |
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return CMD_RET_USAGE; |
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if (argc == 2) slot_suffix = argv[1]; |
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printf("## Android Verified Boot 2.0 version %s ", avb_version_string()); if (avb_ops->read_is_device_unlocked(avb_ops, &unlocked) != AVB_IO_RESULT_OK) { printf("Can't determine device lock state. "); return CMD_RET_FAILURE; } slot_result = avb_slot_verify(avb_ops, requested_partitions, |
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slot_suffix, |
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unlocked, AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE, &out_data); switch (slot_result) { case AVB_SLOT_VERIFY_RESULT_OK: |
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/* Until we don't have support of changing unlock states, we * assume that we are by default in locked state. * So in this case we can boot only when verification is * successful; we also supply in cmdline GREEN boot state */ |
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printf("Verification passed successfully "); /* export additional bootargs to AVB_BOOTARGS env var */ |
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extra_args = avb_set_state(avb_ops, AVB_GREEN); if (extra_args) cmdline = append_cmd_line(out_data->cmdline, extra_args); else cmdline = out_data->cmdline; env_set(AVB_BOOTARGS, cmdline); |
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res = CMD_RET_SUCCESS; break; case AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION: printf("Verification failed "); break; case AVB_SLOT_VERIFY_RESULT_ERROR_IO: printf("I/O error occurred during verification "); break; case AVB_SLOT_VERIFY_RESULT_ERROR_OOM: printf("OOM error occurred during verification "); break; case AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_METADATA: printf("Corrupted dm-verity metadata detected "); break; case AVB_SLOT_VERIFY_RESULT_ERROR_UNSUPPORTED_VERSION: printf("Unsupported version avbtool was used "); break; case AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX: printf("Checking rollback index failed "); break; case AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED: printf("Public key was rejected "); break; default: printf("Unknown error occurred "); } return res; } int do_avb_is_unlocked(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { bool unlock; if (!avb_ops) { printf("AVB not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 1) { printf("--%s(-1) ", __func__); return CMD_RET_USAGE; } if (avb_ops->read_is_device_unlocked(avb_ops, &unlock) == AVB_IO_RESULT_OK) { printf("Unlocked = %d ", unlock); return CMD_RET_SUCCESS; } |
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printf("Can't determine device lock state. "); |
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return CMD_RET_FAILURE; } |
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int do_avb_read_pvalue(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const char *name; size_t bytes; size_t bytes_read; void *buffer; char *endp; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 3) return CMD_RET_USAGE; name = argv[1]; bytes = simple_strtoul(argv[2], &endp, 10); if (*endp && *endp != ' ') return CMD_RET_USAGE; buffer = malloc(bytes); if (!buffer) return CMD_RET_FAILURE; if (avb_ops->read_persistent_value(avb_ops, name, bytes, buffer, &bytes_read) == AVB_IO_RESULT_OK) { |
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printf("Read %zu bytes, value = %s ", bytes_read, |
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(char *)buffer); free(buffer); return CMD_RET_SUCCESS; } printf("Failed to read persistent value "); free(buffer); return CMD_RET_FAILURE; } int do_avb_write_pvalue(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const char *name; const char *value; if (!avb_ops) { printf("AVB 2.0 is not initialized, run 'avb init' first "); return CMD_RET_FAILURE; } if (argc != 3) return CMD_RET_USAGE; name = argv[1]; value = argv[2]; if (avb_ops->write_persistent_value(avb_ops, name, strlen(value) + 1, (const uint8_t *)value) == AVB_IO_RESULT_OK) { |
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printf("Wrote %zu bytes ", strlen(value) + 1); |
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return CMD_RET_SUCCESS; } printf("Failed to write persistent value "); return CMD_RET_FAILURE; } |
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static cmd_tbl_t cmd_avb[] = { U_BOOT_CMD_MKENT(init, 2, 0, do_avb_init, "", ""), U_BOOT_CMD_MKENT(read_rb, 2, 0, do_avb_read_rb, "", ""), U_BOOT_CMD_MKENT(write_rb, 3, 0, do_avb_write_rb, "", ""), U_BOOT_CMD_MKENT(is_unlocked, 1, 0, do_avb_is_unlocked, "", ""), U_BOOT_CMD_MKENT(get_uuid, 2, 0, do_avb_get_uuid, "", ""), U_BOOT_CMD_MKENT(read_part, 5, 0, do_avb_read_part, "", ""), U_BOOT_CMD_MKENT(read_part_hex, 4, 0, do_avb_read_part_hex, "", ""), U_BOOT_CMD_MKENT(write_part, 5, 0, do_avb_write_part, "", ""), |
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U_BOOT_CMD_MKENT(verify, 2, 0, do_avb_verify_part, "", ""), |
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#ifdef CONFIG_OPTEE_TA_AVB U_BOOT_CMD_MKENT(read_pvalue, 3, 0, do_avb_read_pvalue, "", ""), U_BOOT_CMD_MKENT(write_pvalue, 3, 0, do_avb_write_pvalue, "", ""), #endif |
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}; static int do_avb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { cmd_tbl_t *cp; cp = find_cmd_tbl(argv[1], cmd_avb, ARRAY_SIZE(cmd_avb)); 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( avb, 29, 0, do_avb, "Provides commands for testing Android Verified Boot 2.0 functionality", "init <dev> - initialize avb2 for <dev> " "avb read_rb <num> - read rollback index at location <num> " "avb write_rb <num> <rb> - write rollback index <rb> to <num> " "avb is_unlocked - returns unlock status of the device " "avb get_uuid <partname> - read and print uuid of partition <part> " "avb read_part <partname> <offset> <num> <addr> - read <num> bytes from " " partition <partname> to buffer <addr> " "avb read_part_hex <partname> <offset> <num> - read <num> bytes from " " partition <partname> and print to stdout " "avb write_part <partname> <offset> <num> <addr> - write <num> bytes to " " <partname> by <offset> using data from <addr> " |
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#ifdef CONFIG_OPTEE_TA_AVB "avb read_pvalue <name> <bytes> - read a persistent value <name> " "avb write_pvalue <name> <value> - write a persistent value <name> " #endif |
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"avb verify [slot_suffix] - run verification process using hash data " |
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" from vbmeta structure " |
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" [slot_suffix] - _a, _b, etc (if vbmeta partition is slotted) " |
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); |