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d8f9d2af96
Add libavb lib (3rd party library from AOSP), that implements support of AVB 2.0. This library is used for integrity checking of Android partitions on eMMC. libavb was added as it is and minimal changes were introduced to reduce maintenance cost, because it will be deviated from AOSP upstream in the future. Changes: - license headers changed to conform SPDX-style - avb_crc32.c dropped - updates in avb_sysdeps_posix.c/avb_sysdeps.h For additional details check [1] AVB 2.0 README. [1] https://android.googlesource.com/platform/external/avb/+/master/README.md Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "avb_hash_descriptor.h"
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#include "avb_util.h"
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bool avb_hash_descriptor_validate_and_byteswap(const AvbHashDescriptor* src,
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AvbHashDescriptor* dest) {
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uint64_t expected_size;
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avb_memcpy(dest, src, sizeof(AvbHashDescriptor));
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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_HASH) {
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avb_error("Invalid tag for hash descriptor.\n");
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return false;
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}
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dest->image_size = avb_be64toh(dest->image_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->digest_len = avb_be32toh(dest->digest_len);
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dest->flags = avb_be32toh(dest->flags);
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/* Check that partition_name, salt, and digest are fully contained. */
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expected_size = sizeof(AvbHashDescriptor) - 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->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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