avb_hash_descriptor.c
1.47 KB
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// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2016 The Android Open Source Project
*/
#include "avb_hash_descriptor.h"
#include "avb_util.h"
bool avb_hash_descriptor_validate_and_byteswap(const AvbHashDescriptor* src,
AvbHashDescriptor* dest) {
uint64_t expected_size;
avb_memcpy(dest, src, sizeof(AvbHashDescriptor));
if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
(AvbDescriptor*)dest))
return false;
if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASH) {
avb_error("Invalid tag for hash descriptor.\n");
return false;
}
dest->image_size = avb_be64toh(dest->image_size);
dest->partition_name_len = avb_be32toh(dest->partition_name_len);
dest->salt_len = avb_be32toh(dest->salt_len);
dest->digest_len = avb_be32toh(dest->digest_len);
dest->flags = avb_be32toh(dest->flags);
/* Check that partition_name, salt, and digest are fully contained. */
expected_size = sizeof(AvbHashDescriptor) - 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->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;
}