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- // SPDX-License-Identifier: MIT
- /*
- * Copyright (C) 2016 The Android Open Source Project
- */
- #include "avb_hashtree_descriptor.h"
- #include "avb_util.h"
- bool avb_hashtree_descriptor_validate_and_byteswap(
- const AvbHashtreeDescriptor* src, AvbHashtreeDescriptor* dest) {
- uint64_t expected_size;
- avb_memcpy(dest, src, sizeof(AvbHashtreeDescriptor));
- if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
- (AvbDescriptor*)dest))
- return false;
- if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASHTREE) {
- avb_error("Invalid tag for hashtree descriptor.\n");
- return false;
- }
- dest->dm_verity_version = avb_be32toh(dest->dm_verity_version);
- dest->image_size = avb_be64toh(dest->image_size);
- dest->tree_offset = avb_be64toh(dest->tree_offset);
- dest->tree_size = avb_be64toh(dest->tree_size);
- dest->data_block_size = avb_be32toh(dest->data_block_size);
- dest->hash_block_size = avb_be32toh(dest->hash_block_size);
- dest->fec_num_roots = avb_be32toh(dest->fec_num_roots);
- dest->fec_offset = avb_be64toh(dest->fec_offset);
- dest->fec_size = avb_be64toh(dest->fec_size);
- dest->partition_name_len = avb_be32toh(dest->partition_name_len);
- dest->salt_len = avb_be32toh(dest->salt_len);
- dest->root_digest_len = avb_be32toh(dest->root_digest_len);
- dest->flags = avb_be32toh(dest->flags);
- /* Check that partition_name, salt, and root_digest are fully contained. */
- expected_size = sizeof(AvbHashtreeDescriptor) - sizeof(AvbDescriptor);
- if (!avb_safe_add_to(&expected_size, dest->partition_name_len) ||
- !avb_safe_add_to(&expected_size, dest->salt_len) ||
- !avb_safe_add_to(&expected_size, dest->root_digest_len)) {
- avb_error("Overflow while adding up sizes.\n");
- return false;
- }
- if (expected_size > dest->parent_descriptor.num_bytes_following) {
- avb_error("Descriptor payload size overflow.\n");
- return false;
- }
- return true;
- }
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