avb_hashtree_descriptor.c
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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;
}