LXR uboot/lib/libavb/avb_hash

   1// SPDX-License-Identifier: MIT
   2/*
   3 * Copyright (C) 2016 The Android Open Source Project
   4 */
   5
   6#include "avb_hash_descriptor.h"
   7#include "avb_util.h"
   8
   9bool avb_hash_descriptor_validate_and_byteswap(const AvbHashDescriptor* src,
  10                                               AvbHashDescriptor* dest) {
  11  uint64_t expected_size;
  12
  13  avb_memcpy(dest, src, sizeof(AvbHashDescriptor));
  14
  15  if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
  16                                            (AvbDescriptor*)dest))
  17    return false;
  18
  19  if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASH) {
  20    avb_error("Invalid tag for hash descriptor.\n");
  21    return false;
  22  }
  23
  24  dest->image_size = avb_be64toh(dest->image_size);
  25  dest->partition_name_len = avb_be32toh(dest->partition_name_len);
  26  dest->salt_len = avb_be32toh(dest->salt_len);
  27  dest->digest_len = avb_be32toh(dest->digest_len);
  28  dest->flags = avb_be32toh(dest->flags);
  29
  30  /* Check that partition_name, salt, and digest are fully contained. */
  31  expected_size = sizeof(AvbHashDescriptor) - sizeof(AvbDescriptor);
  32  if (!avb_safe_add_to(&expected_size, dest->partition_name_len) ||
  33      !avb_safe_add_to(&expected_size, dest->salt_len) ||
  34      !avb_safe_add_to(&expected_size, dest->digest_len)) {
  35    avb_error("Overflow while adding up sizes.\n");
  36    return false;
  37  }
  38  if (expected_size > dest->parent_descriptor.num_bytes_following) {
  39    avb_error("Descriptor payload size overflow.\n");
  40    return false;
  41  }
  42  return true;
  43}
  44