LXR uboot/lib/libavb/avb_kernel_cmdline

   1// SPDX-License-Identifier: MIT
   2/*
   3 * Copyright (C) 2016 The Android Open Source Project
   4 */
   5
   6#include "avb_kernel_cmdline_descriptor.h"
   7#include "avb_util.h"
   8
   9bool avb_kernel_cmdline_descriptor_validate_and_byteswap(
  10    const AvbKernelCmdlineDescriptor* src, AvbKernelCmdlineDescriptor* dest) {
  11  uint64_t expected_size;
  12
  13  avb_memcpy(dest, src, sizeof(AvbKernelCmdlineDescriptor));
  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_KERNEL_CMDLINE) {
  20    avb_error("Invalid tag for kernel cmdline descriptor.\n");
  21    return false;
  22  }
  23
  24  dest->flags = avb_be32toh(dest->flags);
  25  dest->kernel_cmdline_length = avb_be32toh(dest->kernel_cmdline_length);
  26
  27  /* Check that kernel_cmdline is fully contained. */
  28  expected_size = sizeof(AvbKernelCmdlineDescriptor) - sizeof(AvbDescriptor);
  29  if (!avb_safe_add_to(&expected_size, dest->kernel_cmdline_length)) {
  30    avb_error("Overflow while adding up sizes.\n");
  31    return false;
  32  }
  33  if (expected_size > dest->parent_descriptor.num_bytes_following) {
  34    avb_error("Descriptor payload size overflow.\n");
  35    return false;
  36  }
  37
  38  return true;
  39}
  40