121e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen/* 221e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen * Copyright (C) 2016 The Android Open Source Project 321e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen * 4c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * Permission is hereby granted, free of charge, to any person 5c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * obtaining a copy of this software and associated documentation 6c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * files (the "Software"), to deal in the Software without 7c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * restriction, including without limitation the rights to use, copy, 8c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * modify, merge, publish, distribute, sublicense, and/or sell copies 9c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * of the Software, and to permit persons to whom the Software is 10c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * furnished to do so, subject to the following conditions: 1121e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen * 12c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * The above copyright notice and this permission notice shall be 13c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * included in all copies or substantial portions of the Software. 1421e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen * 15c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22c612e2e353444f6ad714e43702c2afd057516254David Zeuthen * SOFTWARE. 2321e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen */ 2421e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 2521e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen#include "avb_chain_partition_descriptor.h" 2621e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen#include "avb_util.h" 2721e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 2821e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthenbool avb_chain_partition_descriptor_validate_and_byteswap( 2921e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen const AvbChainPartitionDescriptor* src, AvbChainPartitionDescriptor* dest) { 3021e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen uint64_t expected_size; 3121e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 3221e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen avb_memcpy(dest, src, sizeof(AvbChainPartitionDescriptor)); 3321e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 3421e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src, 3521e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen (AvbDescriptor*)dest)) 3621e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen return false; 3721e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 3821e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_CHAIN_PARTITION) { 3921e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen avb_error("Invalid tag for chain partition descriptor.\n"); 4021e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen return false; 4121e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen } 4221e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 4340ee1da883c634ce94bb69e97a52598f8fbc151dDavid Zeuthen dest->rollback_index_location = avb_be32toh(dest->rollback_index_location); 4421e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen dest->partition_name_len = avb_be32toh(dest->partition_name_len); 4521e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen dest->public_key_len = avb_be32toh(dest->public_key_len); 4621e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 4740ee1da883c634ce94bb69e97a52598f8fbc151dDavid Zeuthen if (dest->rollback_index_location < 1) { 4840ee1da883c634ce94bb69e97a52598f8fbc151dDavid Zeuthen avb_error("Invalid rollback index location value.\n"); 4921e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen return false; 5021e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen } 5121e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen 5221e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen /* Check that partition_name and public_key are fully contained. */ 5321e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen expected_size = sizeof(AvbChainPartitionDescriptor) - sizeof(AvbDescriptor); 5421e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen if (!avb_safe_add_to(&expected_size, dest->partition_name_len) || 5521e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen !avb_safe_add_to(&expected_size, dest->public_key_len)) { 5621e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen avb_error("Overflow while adding up sizes.\n"); 5721e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen return false; 5821e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen } 5921e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen if (expected_size > dest->parent_descriptor.num_bytes_following) { 6021e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen avb_error("Descriptor payload size overflow.\n"); 6121e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen return false; 6221e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen } 6321e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen return true; 6421e95266704e572ced1c633bbc4aea9f42afa0a5David Zeuthen} 65