2 * Copyright (C) 2016 The Android Open Source Project
4 * SPDX-License-Identifier: MIT
7 #include "avb_hashtree_descriptor.h"
10 bool avb_hashtree_descriptor_validate_and_byteswap(
11 const AvbHashtreeDescriptor* src, AvbHashtreeDescriptor* dest) {
12 uint64_t expected_size;
14 avb_memcpy(dest, src, sizeof(AvbHashtreeDescriptor));
16 if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
17 (AvbDescriptor*)dest))
20 if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASHTREE) {
21 avb_error("Invalid tag for hashtree descriptor.\n");
25 dest->dm_verity_version = avb_be32toh(dest->dm_verity_version);
26 dest->image_size = avb_be64toh(dest->image_size);
27 dest->tree_offset = avb_be64toh(dest->tree_offset);
28 dest->tree_size = avb_be64toh(dest->tree_size);
29 dest->data_block_size = avb_be32toh(dest->data_block_size);
30 dest->hash_block_size = avb_be32toh(dest->hash_block_size);
31 dest->fec_num_roots = avb_be32toh(dest->fec_num_roots);
32 dest->fec_offset = avb_be64toh(dest->fec_offset);
33 dest->fec_size = avb_be64toh(dest->fec_size);
34 dest->partition_name_len = avb_be32toh(dest->partition_name_len);
35 dest->salt_len = avb_be32toh(dest->salt_len);
36 dest->root_digest_len = avb_be32toh(dest->root_digest_len);
37 dest->flags = avb_be32toh(dest->flags);
39 /* Check that partition_name, salt, and root_digest are fully contained. */
40 expected_size = sizeof(AvbHashtreeDescriptor) - sizeof(AvbDescriptor);
41 if (!avb_safe_add_to(&expected_size, dest->partition_name_len) ||
42 !avb_safe_add_to(&expected_size, dest->salt_len) ||
43 !avb_safe_add_to(&expected_size, dest->root_digest_len)) {
44 avb_error("Overflow while adding up sizes.\n");
47 if (expected_size > dest->parent_descriptor.num_bytes_following) {
48 avb_error("Descriptor payload size overflow.\n");