secure-wipe/wipe_disk

#!/bin/sh
#
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

. /usr/sbin/secure-wipe.sh

# Fully erase the disks on the device via firmware and verify it is erased
# properly.
main() {
  local dev
  local dev_size
  local overwrite_exit_code
  local verify_pattern_exit_code
  local wipe_exit_code
  local verify_wipe_exit_code
  local exit_code=0
  local disk_found=0

  for dev in $(list_fixed_ata_disks) $(list_fixed_mmc_disks) \
      $(list_fixed_nvme_nss); do
    disk_found=1
    # Before secure_erase, disk is written with a checksummed random pattern
    # and verified if the pattern is written correctly. This part can only be
    # executed using block devices.
    dev_size="$(blockdev --getsize64 /dev/${dev})"

    perform_fio_op "/dev/${dev}" "${dev_size}" "write"
    overwrite_exit_code=$?
    if [ "${overwrite_exit_code}" -ne 0 ]; then
      exit_code="${overwrite_exit_code}"
    fi

    perform_fio_op "/dev/${dev}" "${dev_size}" "verify"
    verify_pattern_exit_code=$?
    if [ "${verify_pattern_exit_code}" -ne 0 ]; then
      exit_code="${verify_pattern_exit_code}"
    fi
  done

  for dev in $(list_fixed_ata_disks) $(list_fixed_mmc_disks) \
      $(list_fixed_nvme_disks); do
    # To ensure NVMe device is physically erased, set strict option to 1.
    # To avoid running secure_erase multiple times with different
    # namespaces for the same NVMe device, character device is given as
    # argument.
    secure_erase "/dev/${dev}" 1
    wipe_exit_code=$?
    if [ "${wipe_exit_code}" -ne 0 ]; then
      exit_code="${wipe_exit_code}"
    fi
  done

  for dev in $(list_fixed_ata_disks) $(list_fixed_mmc_disks) \
      $(list_fixed_nvme_nss); do
    # After secure_erase, verify the disk is zeroed. This part can only be
    # executed using block devices.
    perform_fio_op "/dev/${dev}" "${dev_size}" "verify_disk_wipe"
    verify_wipe_exit_code=$?
    if [ "${verify_wipe_exit_code}" -ne 0 ]; then
      exit_code="${verify_wipe_exit_code}"
    fi
  done

  if [ ${disk_found} -eq 1 ]; then
    return ${exit_code}
  else
    return 1
  fi
}

main