1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright (C) 2016 The Android Open Source Project 4 */ 5 6 #include "avb_hash_descriptor.h" 7 #include "avb_util.h" 8 9 bool avb_hash_descriptor_validate_and_byteswap(const AvbHashDescriptor* src, 10 AvbHashDescriptor* dest) { 11 uint64_t expected_size; 12 13 avb_memcpy(dest, src, sizeof(AvbHashDescriptor)); 14 15 if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src, 16 (AvbDescriptor*)dest)) 17 return false; 18 19 if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASH) { 20 avb_error("Invalid tag for hash descriptor.\n"); 21 return false; 22 } 23 24 dest->image_size = avb_be64toh(dest->image_size); 25 dest->partition_name_len = avb_be32toh(dest->partition_name_len); 26 dest->salt_len = avb_be32toh(dest->salt_len); 27 dest->digest_len = avb_be32toh(dest->digest_len); 28 dest->flags = avb_be32toh(dest->flags); 29 30 /* Check that partition_name, salt, and digest are fully contained. */ 31 expected_size = sizeof(AvbHashDescriptor) - sizeof(AvbDescriptor); 32 if (!avb_safe_add_to(&expected_size, dest->partition_name_len) || 33 !avb_safe_add_to(&expected_size, dest->salt_len) || 34 !avb_safe_add_to(&expected_size, dest->digest_len)) { 35 avb_error("Overflow while adding up sizes.\n"); 36 return false; 37 } 38 if (expected_size > dest->parent_descriptor.num_bytes_following) { 39 avb_error("Descriptor payload size overflow.\n"); 40 return false; 41 } 42 return true; 43 } 44
