71 lines
2.9 KiB
C
71 lines
2.9 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "avb_hashtree_descriptor.h"
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#include "avb_util.h"
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bool avb_hashtree_descriptor_validate_and_byteswap(
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const AvbHashtreeDescriptor* src, AvbHashtreeDescriptor* dest) {
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uint64_t expected_size;
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avb_memcpy(dest, src, sizeof(AvbHashtreeDescriptor));
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if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
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(AvbDescriptor*)dest))
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return false;
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if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASHTREE) {
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avb_error("Invalid tag for hashtree descriptor.\n");
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return false;
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}
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dest->dm_verity_version = avb_be32toh(dest->dm_verity_version);
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dest->image_size = avb_be64toh(dest->image_size);
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dest->tree_offset = avb_be64toh(dest->tree_offset);
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dest->tree_size = avb_be64toh(dest->tree_size);
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dest->data_block_size = avb_be32toh(dest->data_block_size);
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dest->hash_block_size = avb_be32toh(dest->hash_block_size);
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dest->fec_num_roots = avb_be32toh(dest->fec_num_roots);
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dest->fec_offset = avb_be64toh(dest->fec_offset);
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dest->fec_size = avb_be64toh(dest->fec_size);
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dest->partition_name_len = avb_be32toh(dest->partition_name_len);
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dest->salt_len = avb_be32toh(dest->salt_len);
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dest->root_digest_len = avb_be32toh(dest->root_digest_len);
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dest->flags = avb_be32toh(dest->flags);
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/* Check that partition_name, salt, and root_digest are fully contained. */
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expected_size = sizeof(AvbHashtreeDescriptor) - sizeof(AvbDescriptor);
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if (!avb_safe_add_to(&expected_size, dest->partition_name_len) ||
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!avb_safe_add_to(&expected_size, dest->salt_len) ||
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!avb_safe_add_to(&expected_size, dest->root_digest_len)) {
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avb_error("Overflow while adding up sizes.\n");
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return false;
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}
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if (expected_size > dest->parent_descriptor.num_bytes_following) {
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avb_error("Descriptor payload size overflow.\n");
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return false;
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}
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return true;
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}
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