/* * (C) Copyright 2018, Linaro Limited * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include #include static const unsigned char avb_root_pub[1032] = { 0x0, 0x0, 0x10, 0x0, 0x55, 0xd9, 0x4, 0xad, 0xd8, 0x4, 0xaf, 0xe3, 0xd3, 0x84, 0x6c, 0x7e, 0xd, 0x89, 0x3d, 0xc2, 0x8c, 0xd3, 0x12, 0x55, 0xe9, 0x62, 0xc9, 0xf1, 0xf, 0x5e, 0xcc, 0x16, 0x72, 0xab, 0x44, 0x7c, 0x2c, 0x65, 0x4a, 0x94, 0xb5, 0x16, 0x2b, 0x0, 0xbb, 0x6, 0xef, 0x13, 0x7, 0x53, 0x4c, 0xf9, 0x64, 0xb9, 0x28, 0x7a, 0x1b, 0x84, 0x98, 0x88, 0xd8, 0x67, 0xa4, 0x23, 0xf9, 0xa7, 0x4b, 0xdc, 0x4a, 0xf, 0xf7, 0x3a, 0x18, 0xae, 0x54, 0xa8, 0x15, 0xfe, 0xb0, 0xad, 0xac, 0x35, 0xda, 0x3b, 0xad, 0x27, 0xbc, 0xaf, 0xe8, 0xd3, 0x2f, 0x37, 0x34, 0xd6, 0x51, 0x2b, 0x6c, 0x5a, 0x27, 0xd7, 0x96, 0x6, 0xaf, 0x6b, 0xb8, 0x80, 0xca, 0xfa, 0x30, 0xb4, 0xb1, 0x85, 0xb3, 0x4d, 0xaa, 0xaa, 0xc3, 0x16, 0x34, 0x1a, 0xb8, 0xe7, 0xc7, 0xfa, 0xf9, 0x9, 0x77, 0xab, 0x97, 0x93, 0xeb, 0x44, 0xae, 0xcf, 0x20, 0xbc, 0xf0, 0x80, 0x11, 0xdb, 0x23, 0xc, 0x47, 0x71, 0xb9, 0x6d, 0xd6, 0x7b, 0x60, 0x47, 0x87, 0x16, 0x56, 0x93, 0xb7, 0xc2, 0x2a, 0x9a, 0xb0, 0x4c, 0x1, 0xc, 0x30, 0xd8, 0x93, 0x87, 0xf0, 0xed, 0x6e, 0x8b, 0xbe, 0x30, 0x5b, 0xf6, 0xa6, 0xaf, 0xdd, 0x80, 0x7c, 0x45, 0x5e, 0x8f, 0x91, 0x93, 0x5e, 0x44, 0xfe, 0xb8, 0x82, 0x7, 0xee, 0x79, 0xca, 0xbf, 0x31, 0x73, 0x62, 0x58, 0xe3, 0xcd, 0xc4, 0xbc, 0xc2, 0x11, 0x1d, 0xa1, 0x4a, 0xbf, 0xfe, 0x27, 0x7d, 0xa1, 0xf6, 0x35, 0xa3, 0x5e, 0xca, 0xdc, 0x57, 0x2f, 0x3e, 0xf0, 0xc9, 0x5d, 0x86, 0x6a, 0xf8, 0xaf, 0x66, 0xa7, 0xed, 0xcd, 0xb8, 0xed, 0xa1, 0x5f, 0xba, 0x9b, 0x85, 0x1a, 0xd5, 0x9, 0xae, 0x94, 0x4e, 0x3b, 0xcf, 0xcb, 0x5c, 0xc9, 0x79, 0x80, 0xf7, 0xcc, 0xa6, 0x4a, 0xa8, 0x6a, 0xd8, 0xd3, 0x31, 0x11, 0xf9, 0xf6, 0x2, 0x63, 0x2a, 0x1a, 0x2d, 0xd1, 0x1a, 0x66, 0x1b, 0x16, 0x41, 0xbd, 0xbd, 0xf7, 0x4d, 0xc0, 0x4a, 0xe5, 0x27, 0x49, 0x5f, 0x7f, 0x58, 0xe3, 0x27, 0x2d, 0xe5, 0xc9, 0x66, 0xe, 0x52, 0x38, 0x16, 0x38, 0xfb, 0x16, 0xeb, 0x53, 0x3f, 0xe6, 0xfd, 0xe9, 0xa2, 0x5e, 0x25, 0x59, 0xd8, 0x79, 0x45, 0xff, 0x3, 0x4c, 0x26, 0xa2, 0x0, 0x5a, 0x8e, 0xc2, 0x51, 0xa1, 0x15, 0xf9, 0x7b, 0xf4, 0x5c, 0x81, 0x9b, 0x18, 0x47, 0x35, 0xd8, 0x2d, 0x5, 0xe9, 0xad, 0xf, 0x35, 0x74, 0x15, 0xa3, 0x8e, 0x8b, 0xcc, 0x27, 0xda, 0x7c, 0x5d, 0xe4, 0xfa, 0x4, 0xd3, 0x5, 0xb, 0xba, 0x3a, 0xb2, 0x49, 0x45, 0x2f, 0x47, 0xc7, 0xd, 0x41, 0x3f, 0x97, 0x80, 0x4d, 0x3f, 0xc1, 0xb5, 0xbb, 0x70, 0x5f, 0xa7, 0x37, 0xaf, 0x48, 0x22, 0x12, 0x45, 0x2e, 0xf5, 0xf, 0x87, 0x92, 0xe2, 0x84, 0x1, 0xf9, 0x12, 0xf, 0x14, 0x15, 0x24, 0xce, 0x89, 0x99, 0xee, 0xb9, 0xc4, 0x17, 0x70, 0x70, 0x15, 0xea, 0xbe, 0xc6, 0x6c, 0x1f, 0x62, 0xb3, 0xf4, 0x2d, 0x16, 0x87, 0xfb, 0x56, 0x1e, 0x45, 0xab, 0xae, 0x32, 0xe4, 0x5e, 0x91, 0xed, 0x53, 0x66, 0x5e, 0xbd, 0xed, 0xad, 0xe6, 0x12, 0x39, 0xd, 0x83, 0xc9, 0xe8, 0x6b, 0x6c, 0x2d, 0xa5, 0xee, 0xc4, 0x5a, 0x66, 0xae, 0x8c, 0x97, 0xd7, 0xd, 0x6c, 0x49, 0xc7, 0xf5, 0xc4, 0x92, 0x31, 0x8b, 0x9, 0xee, 0x33, 0xda, 0xa9, 0x37, 0xb6, 0x49, 0x18, 0xf8, 0xe, 0x60, 0x45, 0xc8, 0x33, 0x91, 0xef, 0x20, 0x57, 0x10, 0xbe, 0x78, 0x2d, 0x83, 0x26, 0xd6, 0xca, 0x61, 0xf9, 0x2f, 0xe0, 0xbf, 0x5, 0x30, 0x52, 0x5a, 0x12, 0x1c, 0x0, 0xa7, 0x5d, 0xcc, 0x7c, 0x2e, 0xc5, 0x95, 0x8b, 0xa3, 0x3b, 0xf0, 0x43, 0x2e, 0x5e, 0xdd, 0x0, 0xdb, 0xd, 0xb3, 0x37, 0x99, 0xa9, 0xcd, 0x9c, 0xb7, 0x43, 0xf7, 0x35, 0x44, 0x21, 0xc2, 0x82, 0x71, 0xab, 0x8d, 0xaa, 0xb4, 0x41, 0x11, 0xec, 0x1e, 0x8d, 0xfc, 0x14, 0x82, 0x92, 0x4e, 0x83, 0x6a, 0xa, 0x6b, 0x35, 0x5e, 0x5d, 0xe9, 0x5c, 0xcc, 0x8c, 0xde, 0x39, 0xd1, 0x4a, 0x5b, 0x5f, 0x63, 0xa9, 0x64, 0xe0, 0xa, 0xcb, 0xb, 0xb8, 0x5a, 0x7c, 0xc3, 0xb, 0xe6, 0xbe, 0xfe, 0x8b, 0xf, 0x7d, 0x34, 0x8e, 0x2, 0x66, 0x74, 0x1, 0x6c, 0xca, 0x76, 0xac, 0x7c, 0x67, 0x8, 0x2f, 0x3f, 0x1a, 0xa6, 0x2c, 0x60, 0xb3, 0xff, 0xda, 0x8d, 0xb8, 0x12, 0xc, 0x0, 0x7f, 0xcc, 0x50, 0xa1, 0x5c, 0x64, 0xa1, 0xe2, 0x5f, 0x32, 0x65, 0xc9, 0x9c, 0xbe, 0xd6, 0xa, 0x13, 0x87, 0x3c, 0x2a, 0x45, 0x47, 0xc, 0xca, 0x42, 0x82, 0xfa, 0x89, 0x65, 0xe7, 0x89, 0xb4, 0x8f, 0xf7, 0x1e, 0xe6, 0x23, 0xa5, 0xd0, 0x59, 0x37, 0x79, 0x92, 0xd7, 0xce, 0x3d, 0xfd, 0xe3, 0xa1, 0xb, 0xcf, 0x6c, 0x85, 0xa0, 0x65, 0xf3, 0x5c, 0xc6, 0x4a, 0x63, 0x5f, 0x6e, 0x3a, 0x3a, 0x2a, 0x8b, 0x6a, 0xb6, 0x2f, 0xbb, 0xf8, 0xb2, 0x4b, 0x62, 0xbc, 0x1a, 0x91, 0x25, 0x66, 0xe3, 0x69, 0xca, 0x60, 0x49, 0xb, 0xf6, 0x8a, 0xbe, 0x3e, 0x76, 0x53, 0xc2, 0x7a, 0xa8, 0x4, 0x17, 0x75, 0xf1, 0xf3, 0x3, 0x62, 0x1b, 0x85, 0xb2, 0xb0, 0xef, 0x80, 0x15, 0xb6, 0xd4, 0x4e, 0xdf, 0x71, 0xac, 0xdb, 0x2a, 0x4, 0xd4, 0xb4, 0x21, 0xba, 0x65, 0x56, 0x57, 0xe8, 0xfa, 0x84, 0xa2, 0x7d, 0x13, 0xe, 0xaf, 0xd7, 0x9a, 0x58, 0x2a, 0xa3, 0x81, 0x84, 0x8d, 0x9, 0xa0, 0x6a, 0xc1, 0xbb, 0xd9, 0xf5, 0x86, 0xac, 0xbd, 0x75, 0x61, 0x9, 0xe6, 0x8c, 0x3d, 0x77, 0xb2, 0xed, 0x30, 0x20, 0xe4, 0x0, 0x1d, 0x97, 0xe8, 0xbf, 0xc7, 0x0, 0x1b, 0x21, 0xb1, 0x16, 0xe7, 0x41, 0x67, 0x2e, 0xec, 0x38, 0xbc, 0xe5, 0x1b, 0xb4, 0x6, 0x23, 0x31, 0x71, 0x1c, 0x49, 0xcd, 0x76, 0x4a, 0x76, 0x36, 0x8d, 0xa3, 0x89, 0x8b, 0x4a, 0x7a, 0xf4, 0x87, 0xc8, 0x15, 0xf, 0x37, 0x39, 0xf6, 0x6d, 0x80, 0x19, 0xef, 0x5c, 0xa8, 0x66, 0xce, 0x1b, 0x16, 0x79, 0x21, 0xdf, 0xd7, 0x31, 0x30, 0xc4, 0x21, 0xdd, 0x34, 0x5b, 0xd2, 0x1a, 0x2b, 0x3e, 0x5d, 0xf7, 0xea, 0xca, 0x5, 0x8e, 0xb7, 0xcb, 0x49, 0x2e, 0xa0, 0xe3, 0xf4, 0xa7, 0x48, 0x19, 0x10, 0x9c, 0x4, 0xa7, 0xf4, 0x28, 0x74, 0xc8, 0x6f, 0x63, 0x20, 0x2b, 0x46, 0x24, 0x26, 0x19, 0x1d, 0xd1, 0x2c, 0x31, 0x6d, 0x5a, 0x29, 0xa2, 0x6, 0xa6, 0xb2, 0x41, 0xcc, 0xa, 0x27, 0x96, 0x9, 0x96, 0xac, 0x47, 0x65, 0x78, 0x68, 0x51, 0x98, 0xd6, 0xd8, 0xa6, 0x2d, 0xa0, 0xcf, 0xec, 0xe2, 0x74, 0xf2, 0x82, 0xe3, 0x97, 0xd9, 0x7e, 0xd4, 0xf8, 0xb, 0x70, 0x43, 0x3d, 0xb1, 0x7b, 0x97, 0x80, 0xd6, 0xcb, 0xd7, 0x19, 0xbc, 0x63, 0xb, 0xfd, 0x4d, 0x88, 0xfe, 0x67, 0xac, 0xb8, 0xcc, 0x50, 0xb7, 0x68, 0xb3, 0x5b, 0xd6, 0x1e, 0x25, 0xfc, 0x5f, 0x3c, 0x8d, 0xb1, 0x33, 0x7c, 0xb3, 0x49, 0x1, 0x3f, 0x71, 0x55, 0xe, 0x51, 0xba, 0x61, 0x26, 0xfa, 0xea, 0xe5, 0xb5, 0xe8, 0xaa, 0xcf, 0xcd, 0x96, 0x9f, 0xd6, 0xc1, 0x5f, 0x53, 0x91, 0xad, 0x5, 0xde, 0x20, 0xe7, 0x51, 0xda, 0x5b, 0x95, 0x67, 0xed, 0xf4, 0xee, 0x42, 0x65, 0x70, 0x13, 0xb, 0x70, 0x14, 0x1c, 0xc9, 0xe0, 0x19, 0xca, 0x5f, 0xf5, 0x1d, 0x70, 0x4b, 0x6c, 0x6, 0x74, 0xec, 0xb5, 0x2e, 0x77, 0xe1, 0x74, 0xa1, 0xa3, 0x99, 0xa0, 0x85, 0x9e, 0xf1, 0xac, 0xd8, 0x7e, }; /** * ============================================================================ * Boot states support (GREEN, YELLOW, ORANGE, RED) and dm_verity * ============================================================================ */ char *avb_set_state(AvbOps *ops, enum avb_boot_state boot_state) { struct AvbOpsData *data; char *cmdline = NULL; if (!ops) return NULL; data = (struct AvbOpsData *)ops->user_data; if (!data) return NULL; data->boot_state = boot_state; switch (boot_state) { case AVB_GREEN: cmdline = "androidboot.verifiedbootstate=green"; break; case AVB_YELLOW: cmdline = "androidboot.verifiedbootstate=yellow"; break; case AVB_ORANGE: cmdline = "androidboot.verifiedbootstate=orange"; case AVB_RED: break; } return cmdline; } char *append_cmd_line(char *cmdline_orig, char *cmdline_new) { char *cmd_line; if (!cmdline_new) return cmdline_orig; if (cmdline_orig) cmd_line = cmdline_orig; else cmd_line = " "; cmd_line = avb_strdupv(cmd_line, " ", cmdline_new, NULL); return cmd_line; } static int avb_find_dm_args(char **args, char *str) { int i; if (!str) return -1; for (i = 0; i < AVB_MAX_ARGS && args[i]; ++i) { if (strstr(args[i], str)) return i; } return -1; } static char *avb_set_enforce_option(const char *cmdline, const char *option) { char *cmdarg[AVB_MAX_ARGS]; char *newargs = NULL; int i = 0; int total_args; memset(cmdarg, 0, sizeof(cmdarg)); cmdarg[i++] = strtok((char *)cmdline, " "); do { cmdarg[i] = strtok(NULL, " "); if (!cmdarg[i]) break; if (++i >= AVB_MAX_ARGS) { printf("%s: Can't handle more then %d args\n", __func__, i); return NULL; } } while (true); total_args = i; i = avb_find_dm_args(&cmdarg[0], VERITY_TABLE_OPT_LOGGING); if (i >= 0) { cmdarg[i] = (char *)option; } else { i = avb_find_dm_args(&cmdarg[0], VERITY_TABLE_OPT_RESTART); if (i < 0) { printf("%s: No verity options found\n", __func__); return NULL; } cmdarg[i] = (char *)option; } for (i = 0; i <= total_args; i++) newargs = append_cmd_line(newargs, cmdarg[i]); return newargs; } char *avb_set_ignore_corruption(const char *cmdline) { char *newargs = NULL; newargs = avb_set_enforce_option(cmdline, VERITY_TABLE_OPT_LOGGING); if (newargs) newargs = append_cmd_line(newargs, "androidboot.veritymode=eio"); return newargs; } char *avb_set_enforce_verity(const char *cmdline) { char *newargs; newargs = avb_set_enforce_option(cmdline, VERITY_TABLE_OPT_RESTART); if (newargs) newargs = append_cmd_line(newargs, "androidboot.veritymode=enforcing"); return newargs; } /** * ============================================================================ * IO(mmc) auxiliary functions * ============================================================================ */ static unsigned long mmc_read_and_flush(struct mmc_part *part, lbaint_t start, lbaint_t sectors, void *buffer) { unsigned long blks; void *tmp_buf; size_t buf_size; bool unaligned = is_buf_unaligned(buffer); if (start < part->info.start) { printf("%s: partition start out of bounds\n", __func__); return 0; } if ((start + sectors) > (part->info.start + part->info.size)) { sectors = part->info.start + part->info.size - start; printf("%s: read sector aligned to partition bounds (%ld)\n", __func__, sectors); } /* * Reading fails on unaligned buffers, so we have to * use aligned temporary buffer and then copy to destination */ if (unaligned) { printf("Handling unaligned read buffer..\n"); tmp_buf = get_sector_buf(); buf_size = get_sector_buf_size(); if (sectors > buf_size / part->info.blksz) sectors = buf_size / part->info.blksz; } else { tmp_buf = buffer; } blks = blk_dread(part->mmc_blk, start, sectors, tmp_buf); /* flush cache after read */ flush_cache((ulong)tmp_buf, sectors * part->info.blksz); if (unaligned) memcpy(buffer, tmp_buf, sectors * part->info.blksz); return blks; } static unsigned long mmc_write(struct mmc_part *part, lbaint_t start, lbaint_t sectors, void *buffer) { void *tmp_buf; size_t buf_size; bool unaligned = is_buf_unaligned(buffer); if (start < part->info.start) { printf("%s: partition start out of bounds\n", __func__); return 0; } if ((start + sectors) > (part->info.start + part->info.size)) { sectors = part->info.start + part->info.size - start; printf("%s: sector aligned to partition bounds (%ld)\n", __func__, sectors); } if (unaligned) { tmp_buf = get_sector_buf(); buf_size = get_sector_buf_size(); printf("Handling unaligned wrire buffer..\n"); if (sectors > buf_size / part->info.blksz) sectors = buf_size / part->info.blksz; memcpy(tmp_buf, buffer, sectors * part->info.blksz); } else { tmp_buf = buffer; } return blk_dwrite(part->mmc_blk, start, sectors, tmp_buf); } static struct mmc_part *get_partition(AvbOps *ops, const char *partition) { int ret; u8 dev_num; int part_num = 0; struct mmc_part *part; struct blk_desc *mmc_blk; part = malloc(sizeof(struct mmc_part)); if (!part) return NULL; dev_num = get_boot_device(ops); part->mmc = find_mmc_device(dev_num); if (!part->mmc) { printf("No MMC device at slot %x\n", dev_num); goto err; } if (mmc_init(part->mmc)) { printf("MMC initialization failed\n"); goto err; } ret = mmc_switch_part(part->mmc, part_num); if (ret) goto err; mmc_blk = mmc_get_blk_desc(part->mmc); if (!mmc_blk) { printf("Error - failed to obtain block descriptor\n"); goto err; } ret = part_get_info_by_name(mmc_blk, partition, &part->info); if (!ret) { printf("Can't find partition '%s'\n", partition); goto err; } part->dev_num = dev_num; part->mmc_blk = mmc_blk; return part; err: free(part); return NULL; } static AvbIOResult mmc_byte_io(AvbOps *ops, const char *partition, s64 offset, size_t num_bytes, void *buffer, size_t *out_num_read, enum mmc_io_type io_type) { ulong ret; struct mmc_part *part; u64 start_offset, start_sector, sectors, residue; u8 *tmp_buf; size_t io_cnt = 0; if (!partition || !buffer || io_type > IO_WRITE) return AVB_IO_RESULT_ERROR_IO; part = get_partition(ops, partition); if (!part) return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION; if (!part->info.blksz) return AVB_IO_RESULT_ERROR_IO; start_offset = calc_offset(part, offset); while (num_bytes) { start_sector = start_offset / part->info.blksz; sectors = num_bytes / part->info.blksz; /* handle non block-aligned reads */ if (start_offset % part->info.blksz || num_bytes < part->info.blksz) { tmp_buf = get_sector_buf(); if (start_offset % part->info.blksz) { residue = part->info.blksz - (start_offset % part->info.blksz); if (residue > num_bytes) residue = num_bytes; } else { residue = num_bytes; } if (io_type == IO_READ) { ret = mmc_read_and_flush(part, part->info.start + start_sector, 1, tmp_buf); if (ret != 1) { printf("%s: read error (%ld, %lld)\n", __func__, ret, start_sector); return AVB_IO_RESULT_ERROR_IO; } /* * if this is not aligned at sector start, * we have to adjust the tmp buffer */ tmp_buf += (start_offset % part->info.blksz); memcpy(buffer, (void *)tmp_buf, residue); } else { ret = mmc_read_and_flush(part, part->info.start + start_sector, 1, tmp_buf); if (ret != 1) { printf("%s: read error (%ld, %lld)\n", __func__, ret, start_sector); return AVB_IO_RESULT_ERROR_IO; } memcpy((void *)tmp_buf + start_offset % part->info.blksz, buffer, residue); ret = mmc_write(part, part->info.start + start_sector, 1, tmp_buf); if (ret != 1) { printf("%s: write error (%ld, %lld)\n", __func__, ret, start_sector); return AVB_IO_RESULT_ERROR_IO; } } io_cnt += residue; buffer += residue; start_offset += residue; num_bytes -= residue; continue; } if (sectors) { if (io_type == IO_READ) { ret = mmc_read_and_flush(part, part->info.start + start_sector, sectors, buffer); } else { ret = mmc_write(part, part->info.start + start_sector, sectors, buffer); } if (!ret) { printf("%s: sector read error\n", __func__); return AVB_IO_RESULT_ERROR_IO; } io_cnt += ret * part->info.blksz; buffer += ret * part->info.blksz; start_offset += ret * part->info.blksz; num_bytes -= ret * part->info.blksz; } } /* Set counter for read operation */ if (io_type == IO_READ && out_num_read) *out_num_read = io_cnt; return AVB_IO_RESULT_OK; } /** * ============================================================================ * AVB 2.0 operations * ============================================================================ */ /** * read_from_partition() - reads @num_bytes from @offset from partition * identified by a string name * * @ops: contains AVB ops handlers * @partition_name: partition name, NUL-terminated UTF-8 string * @offset: offset from the beginning of partition * @num_bytes: amount of bytes to read * @buffer: destination buffer to store data * @out_num_read: * * @return: * AVB_IO_RESULT_OK, if partition was found and read operation succeed * AVB_IO_RESULT_ERROR_IO, if i/o error occurred from the underlying i/o * subsystem * AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if there is no partition with * the given name */ static AvbIOResult read_from_partition(AvbOps *ops, const char *partition_name, s64 offset_from_partition, size_t num_bytes, void *buffer, size_t *out_num_read) { return mmc_byte_io(ops, partition_name, offset_from_partition, num_bytes, buffer, out_num_read, IO_READ); } /** * write_to_partition() - writes N bytes to a partition identified by a string * name * * @ops: AvbOps, contains AVB ops handlers * @partition_name: partition name * @offset_from_partition: offset from the beginning of partition * @num_bytes: amount of bytes to write * @buf: data to write * @out_num_read: * * @return: * AVB_IO_RESULT_OK, if partition was found and read operation succeed * AVB_IO_RESULT_ERROR_IO, if input/output error occurred * AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition, specified in * @partition_name was not found */ static AvbIOResult write_to_partition(AvbOps *ops, const char *partition_name, s64 offset_from_partition, size_t num_bytes, const void *buffer) { return mmc_byte_io(ops, partition_name, offset_from_partition, num_bytes, (void *)buffer, NULL, IO_WRITE); } /** * validate_vmbeta_public_key() - checks if the given public key used to sign * the vbmeta partition is trusted * * @ops: AvbOps, contains AVB ops handlers * @public_key_data: public key for verifying vbmeta partition signature * @public_key_length: length of public key * @public_key_metadata: * @public_key_metadata_length: * @out_key_is_trusted: * * @return: * AVB_IO_RESULT_OK, if partition was found and read operation succeed */ static AvbIOResult validate_vbmeta_public_key(AvbOps *ops, const u8 *public_key_data, size_t public_key_length, const u8 *public_key_metadata, size_t public_key_metadata_length, bool *out_key_is_trusted) { if (!public_key_length || !public_key_data || !out_key_is_trusted) return AVB_IO_RESULT_ERROR_IO; *out_key_is_trusted = false; if (public_key_length != sizeof(avb_root_pub)) return AVB_IO_RESULT_ERROR_IO; if (memcmp(avb_root_pub, public_key_data, public_key_length) == 0) *out_key_is_trusted = true; return AVB_IO_RESULT_OK; } #ifdef CONFIG_OPTEE_TA_AVB static int get_open_session(struct AvbOpsData *ops_data) { struct udevice *tee = NULL; while (!ops_data->tee) { 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) { ops_data->tee = tee; ops_data->session = arg.session; } } return 0; } static AvbIOResult invoke_func(struct AvbOpsData *ops_data, u32 func, ulong num_param, struct tee_param *param) { struct tee_invoke_arg arg; if (get_open_session(ops_data)) return AVB_IO_RESULT_ERROR_IO; memset(&arg, 0, sizeof(arg)); arg.func = func; arg.session = ops_data->session; if (tee_invoke_func(ops_data->tee, &arg, num_param, param)) return AVB_IO_RESULT_ERROR_IO; switch (arg.ret) { case TEE_SUCCESS: return AVB_IO_RESULT_OK; case TEE_ERROR_OUT_OF_MEMORY: return AVB_IO_RESULT_ERROR_OOM; case TEE_ERROR_STORAGE_NO_SPACE: return AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE; case TEE_ERROR_ITEM_NOT_FOUND: return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE; case TEE_ERROR_TARGET_DEAD: /* * The TA has paniced, close the session to reload the TA * for the next request. */ tee_close_session(ops_data->tee, ops_data->session); ops_data->tee = NULL; return AVB_IO_RESULT_ERROR_IO; default: return AVB_IO_RESULT_ERROR_IO; } } #endif /** * read_rollback_index() - gets the rollback index corresponding to the * location of given by @out_rollback_index. * * @ops: contains AvbOps handlers * @rollback_index_slot: * @out_rollback_index: used to write a retrieved rollback index. * * @return * AVB_IO_RESULT_OK, if the roolback index was retrieved */ static AvbIOResult read_rollback_index(AvbOps *ops, size_t rollback_index_slot, u64 *out_rollback_index) { #ifndef CONFIG_OPTEE_TA_AVB /* For now we always return 0 as the stored rollback index. */ printf("%s not supported yet\n", __func__); if (out_rollback_index) *out_rollback_index = 0; return AVB_IO_RESULT_OK; #else AvbIOResult rc; struct tee_param param[2]; if (rollback_index_slot >= TA_AVB_MAX_ROLLBACK_LOCATIONS) return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE; memset(param, 0, sizeof(param)); param[0].attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT; param[0].u.value.a = rollback_index_slot; param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT; rc = invoke_func(ops->user_data, TA_AVB_CMD_READ_ROLLBACK_INDEX, ARRAY_SIZE(param), param); if (rc) return rc; *out_rollback_index = (u64)param[1].u.value.a << 32 | (u32)param[1].u.value.b; return AVB_IO_RESULT_OK; #endif } /** * write_rollback_index() - sets the rollback index corresponding to the * location of given by @out_rollback_index. * * @ops: contains AvbOps handlers * @rollback_index_slot: * @rollback_index: rollback index to write. * * @return * AVB_IO_RESULT_OK, if the roolback index was retrieved */ static AvbIOResult write_rollback_index(AvbOps *ops, size_t rollback_index_slot, u64 rollback_index) { #ifndef CONFIG_OPTEE_TA_AVB /* For now this is a no-op. */ printf("%s not supported yet\n", __func__); return AVB_IO_RESULT_OK; #else struct tee_param param[2]; if (rollback_index_slot >= TA_AVB_MAX_ROLLBACK_LOCATIONS) return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE; memset(param, 0, sizeof(param)); param[0].attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT; param[0].u.value.a = rollback_index_slot; param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT; param[1].u.value.a = (u32)(rollback_index >> 32); param[1].u.value.b = (u32)rollback_index; return invoke_func(ops->user_data, TA_AVB_CMD_WRITE_ROLLBACK_INDEX, ARRAY_SIZE(param), param); #endif } /** * read_is_device_unlocked() - gets whether the device is unlocked * * @ops: contains AVB ops handlers * @out_is_unlocked: device unlock state is stored here, true if unlocked, * false otherwise * * @return: * AVB_IO_RESULT_OK: state is retrieved successfully * AVB_IO_RESULT_ERROR_IO: an error occurred */ static AvbIOResult read_is_device_unlocked(AvbOps *ops, bool *out_is_unlocked) { #ifndef CONFIG_OPTEE_TA_AVB /* For now we always return that the device is unlocked. */ printf("%s not supported yet\n", __func__); *out_is_unlocked = true; return AVB_IO_RESULT_OK; #else AvbIOResult rc; struct tee_param param = { .attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT }; rc = invoke_func(ops->user_data, TA_AVB_CMD_READ_LOCK_STATE, 1, ¶m); if (rc) return rc; *out_is_unlocked = !param.u.value.a; return AVB_IO_RESULT_OK; #endif } /** * get_unique_guid_for_partition() - gets the GUID for a partition identified * by a string name * * @ops: contains AVB ops handlers * @partition: partition name (NUL-terminated UTF-8 string) * @guid_buf: buf, used to copy in GUID string. Example of value: * 527c1c6d-6361-4593-8842-3c78fcd39219 * @guid_buf_size: @guid_buf buffer size * * @return: * AVB_IO_RESULT_OK, on success (GUID found) * AVB_IO_RESULT_ERROR_IO, if incorrect buffer size (@guid_buf_size) was * provided * AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition was not found */ static AvbIOResult get_unique_guid_for_partition(AvbOps *ops, const char *partition, char *guid_buf, size_t guid_buf_size) { struct mmc_part *part; size_t uuid_size; part = get_partition(ops, partition); if (!part) return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION; uuid_size = sizeof(part->info.uuid); if (uuid_size > guid_buf_size) return AVB_IO_RESULT_ERROR_IO; memcpy(guid_buf, part->info.uuid, uuid_size); guid_buf[uuid_size - 1] = 0; return AVB_IO_RESULT_OK; } /** * get_size_of_partition() - gets the size of a partition identified * by a string name * * @ops: contains AVB ops handlers * @partition: partition name (NUL-terminated UTF-8 string) * @out_size_num_bytes: returns the value of a partition size * * @return: * AVB_IO_RESULT_OK, on success (GUID found) * AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE, out_size_num_bytes is NULL * AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition was not found */ static AvbIOResult get_size_of_partition(AvbOps *ops, const char *partition, u64 *out_size_num_bytes) { struct mmc_part *part; if (!out_size_num_bytes) return AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE; part = get_partition(ops, partition); if (!part) return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION; *out_size_num_bytes = part->info.blksz * part->info.size; return AVB_IO_RESULT_OK; } #ifdef CONFIG_OPTEE_TA_AVB static AvbIOResult read_persistent_value(AvbOps *ops, const char *name, size_t buffer_size, u8 *out_buffer, size_t *out_num_bytes_read) { AvbIOResult rc; struct tee_shm *shm_name; struct tee_shm *shm_buf; struct tee_param param[2]; struct udevice *tee; size_t name_size = strlen(name) + 1; if (get_open_session(ops->user_data)) return AVB_IO_RESULT_ERROR_IO; tee = ((struct AvbOpsData *)ops->user_data)->tee; rc = tee_shm_alloc(tee, name_size, TEE_SHM_ALLOC, &shm_name); if (rc) return AVB_IO_RESULT_ERROR_OOM; rc = tee_shm_alloc(tee, buffer_size, TEE_SHM_ALLOC, &shm_buf); if (rc) { rc = AVB_IO_RESULT_ERROR_OOM; 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(ops->user_data, TA_AVB_CMD_READ_PERSIST_VALUE, 2, param); if (rc) goto out; if (param[1].u.memref.size > buffer_size) { rc = AVB_IO_RESULT_ERROR_NO_SUCH_VALUE; 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 AvbIOResult write_persistent_value(AvbOps *ops, const char *name, size_t value_size, const u8 *value) { AvbIOResult rc; struct tee_shm *shm_name; struct tee_shm *shm_buf; struct tee_param param[2]; struct udevice *tee; size_t name_size = strlen(name) + 1; if (get_open_session(ops->user_data)) return AVB_IO_RESULT_ERROR_IO; tee = ((struct AvbOpsData *)ops->user_data)->tee; if (!value_size) return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE; rc = tee_shm_alloc(tee, name_size, TEE_SHM_ALLOC, &shm_name); if (rc) return AVB_IO_RESULT_ERROR_OOM; rc = tee_shm_alloc(tee, value_size, TEE_SHM_ALLOC, &shm_buf); if (rc) { rc = AVB_IO_RESULT_ERROR_OOM; 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(ops->user_data, 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; } #endif /** * ============================================================================ * AVB2.0 AvbOps alloc/initialisation/free * ============================================================================ */ AvbOps *avb_ops_alloc(int boot_device) { struct AvbOpsData *ops_data; ops_data = avb_calloc(sizeof(struct AvbOpsData)); if (!ops_data) return NULL; ops_data->ops.user_data = ops_data; ops_data->ops.read_from_partition = read_from_partition; ops_data->ops.write_to_partition = write_to_partition; ops_data->ops.validate_vbmeta_public_key = validate_vbmeta_public_key; ops_data->ops.read_rollback_index = read_rollback_index; ops_data->ops.write_rollback_index = write_rollback_index; ops_data->ops.read_is_device_unlocked = read_is_device_unlocked; ops_data->ops.get_unique_guid_for_partition = get_unique_guid_for_partition; #ifdef CONFIG_OPTEE_TA_AVB ops_data->ops.write_persistent_value = write_persistent_value; ops_data->ops.read_persistent_value = read_persistent_value; #endif ops_data->ops.get_size_of_partition = get_size_of_partition; ops_data->mmc_dev = boot_device; return &ops_data->ops; } void avb_ops_free(AvbOps *ops) { struct AvbOpsData *ops_data; if (!ops) return; ops_data = ops->user_data; if (ops_data) { #ifdef CONFIG_OPTEE_TA_AVB if (ops_data->tee) tee_close_session(ops_data->tee, ops_data->session); #endif avb_free(ops_data); } }