blob: b961e47cc6d4a4c30c83f64e0a7f305f15cbeffa [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#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);
/* 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;
}