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- // SPDX-License-Identifier: MIT
- /*
- * Copyright (C) 2016 The Android Open Source Project
- */
- #include "avb_chain_partition_descriptor.h"
- #include "avb_util.h"
- bool avb_chain_partition_descriptor_validate_and_byteswap(
- const AvbChainPartitionDescriptor* src, AvbChainPartitionDescriptor* dest) {
- uint64_t expected_size;
- avb_memcpy(dest, src, sizeof(AvbChainPartitionDescriptor));
- if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
- (AvbDescriptor*)dest))
- return false;
- if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_CHAIN_PARTITION) {
- avb_error("Invalid tag for chain partition descriptor.\n");
- return false;
- }
- dest->rollback_index_location = avb_be32toh(dest->rollback_index_location);
- dest->partition_name_len = avb_be32toh(dest->partition_name_len);
- dest->public_key_len = avb_be32toh(dest->public_key_len);
- if (dest->rollback_index_location < 1) {
- avb_error("Invalid rollback index location value.\n");
- return false;
- }
- /* Check that partition_name and public_key are fully contained. */
- expected_size = sizeof(AvbChainPartitionDescriptor) - sizeof(AvbDescriptor);
- if (!avb_safe_add_to(&expected_size, dest->partition_name_len) ||
- !avb_safe_add_to(&expected_size, dest->public_key_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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