oobe_config/etc/init/oobe_config_save.conf

# 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.

description     "OOBE Config Save"
author          "chromium-os-dev@chromium.org"

start on starting pre-shutdown

# 32MByte RLIMIT_MEMLOCK, this is required because oobe_config_save uses
# SecureBlob to store owner key, install attributes and shill default profile,
# and SecureBlob uses mlock().
limit memlock 33554432 33554432

task
script
  # Checks if a rollback is being requested and stages system files
  # to a location owned by oobe_config_save. Then oobe_config_save
  # runs in the jail to package and encrypt the data.
  if rollback_prepare_save; then
    # --profile=minimalistic-mountns Set up a minimalistic mount namespace
    # -p Enter a new PID namespace and run the process as init (pid=1).
    # -I Runs program as init inside a new pid namespace.
    # -e Enter a new network namespace.
    # -l Enter a new IPC namespace.
    # --uts Enters a new UTS namespace.
    # -n Sets the no_new_privs bit.
    # -S Apply seccomp filters.
    # -u Run as oobe_config_restore user.
    # -g Run as oobe_config_restore group.
    # NOTE: The ebuild erases the "-b /run/tcsd" line on TPM2 devices.
    minijail0 \
      --profile=minimalistic-mountns \
      -p -I \
      -e \
      -l \
      --uts \
      -n \
      -k '/run,/run,tmpfs,MS_NODEV|MS_NOEXEC|MS_NOSUID,mode=755,size=10M' \
      -b /run/dbus \
      -b /run/tcsd \
      -k '/var,/var,tmpfs,MS_NODEV|MS_NOEXEC|MS_NOSUID,mode=755,size=10M' \
      -b /var/lib/metrics,,1 \
      -b /var/lib/oobe_config_save,,1 \
      -k '/mnt/stateful_partition,/mnt/stateful_partition,tmpfs,MS_NODEV|MS_NOEXEC|MS_NOSUID,mode=755,size=10M' \
      -b /mnt/stateful_partition/unencrypted/preserve,,1 \
      -u oobe_config_save -g oobe_config_save \
      -G \
      -S /usr/share/policy/oobe_config_save-seccomp.policy \
      /usr/sbin/oobe_config_save
    fi
  # If the save file was written successfully and a powerwash is pending, switch
  # to a rollback powerwash that will not reset the TPM
  if [ -f "/var/lib/oobe_config_save/.data_saved" ] &&
      [ -f "/mnt/stateful_partition/factory_install_reset" ]; then
    echo "fast safe keepimg rollback reason=oobe_config_save" > \
      /mnt/stateful_partition/factory_install_reset
  fi
end script