avb_chain_partition_descriptor.c
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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;
}