| /* |
| * 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; |
| } |