microdroid/init.rc

# Copyright (C) 2021 The Android Open Source Project
#
# init.rc for microdroid. This contains a minimal script plus basic service definitions (e.g. apexd)
# needed for microdroid to run.
# TODO(b/179340780): support APEX init scripts
#
# IMPORTANT: Do not create world writable files or directories.
# This is a common source of Android security bugs.
#

import /init.environ.rc

# Cgroups are mounted right before early-init using list from /etc/cgroups.json
on early-init
    start ueventd
    setprop ro.apex.updatable true
    setprop ro.debuggable 1
    setprop ro.adb.secure 0

    # Generate ld.config.txt
    exec -- /system/bin/bootstrap/linkerconfig --target /linkerconfig
    chmod 644 /linkerconfig/ld.config.txt

    # Run apexd-bootstrap so that APEXes that provide critical libraries
    # become available. Note that this is executed as exec_start to ensure that
    # the libraries are available to the processes started after this statement.
    exec_start apexd-bootstrap

    # Generate linker config based on apex mounted in bootstrap namespace
    update_linker_config

on init
    # Mount binderfs
    mkdir /dev/binderfs
    mount binder binder /dev/binderfs stats=global
    chmod 0755 /dev/binderfs

    symlink /dev/binderfs/binder /dev/binder
    symlink /dev/binderfs/hwbinder /dev/hwbinder
    symlink /dev/binderfs/vndbinder /dev/vndbinder

    chmod 0666 /dev/binderfs/hwbinder
    chmod 0666 /dev/binderfs/binder
    chmod 0666 /dev/binderfs/vndbinder

    # Start logd before any other services run to ensure we capture all of their logs.
    start logd

    start servicemanager

on load_persist_props_action
    start logd
    start logd-reinit

# Mount filesystems and start core system services.
on late-init
    trigger early-fs

    # Mount fstab in init.{$device}.rc by mount_all command. Optional parameter
    # '--early' can be specified to skip entries with 'latemount'.
    # /system and /vendor must be mounted by the end of the fs stage,
    # while /data is optional.
    trigger fs
    trigger post-fs

    # Mount fstab in init.{$device}.rc by mount_all with '--late' parameter
    # to only mount entries with 'latemount'. This is needed if '--early' is
    # specified in the previous mount_all command on the fs stage.
    # With /system mounted and properties form /system + /factory available,
    # some services can be started.
    trigger late-fs

    # Load persist properties and override properties (if enabled) from /data.
    trigger load_persist_props_action

    # Should be before netd, but after apex, properties and logging is available.
    trigger load_bpf_programs

    # Now we can start zygote for devices with file based encryption
    trigger zygote-start

    # Remove a file to wake up anything waiting for firmware.
    trigger firmware_mounts_complete

    trigger early-boot
    trigger boot

on post-fs
    # Once everything is setup, no need to modify /.
    # The bind+remount combination allows this to work in containers.
    mount rootfs rootfs / remount bind ro nodev

    # Currently, exec_start apexd-bootstrap is enough to run adb.
    # TODO(b/179342589): uncomment after turning off APEX session on microdroid
    # start apexd
    # Wait for apexd to finish activating APEXes before starting more processes.
    # wait_for_prop apexd.status activated

    start adbd

service ueventd /system/bin/ueventd
    class core
    critical
    seclabel u:r:ueventd:s0
    shutdown critical

service console /system/bin/sh
    class core
    console
    disabled
    user shell
    group shell log readproc
    seclabel u:r:shell:s0
    setenv HOSTNAME console

service servicemanager /system/bin/servicemanager
    class core animation
    user system
    group system readproc
    critical
    # TODO(b/179342589): uncomment after turning off APEX session on microdroid
    # onrestart restart apexd
    onrestart class_restart main
    shutdown critical

service logd /system/bin/logd
    socket logd stream 0666 logd logd
    socket logdr seqpacket 0666 logd logd
    socket logdw dgram+passcred 0222 logd logd
    file /proc/kmsg r
    file /dev/kmsg w
    user logd
    group logd system package_info readproc
    capabilities SYSLOG AUDIT_CONTROL
    priority 10

service logd-reinit /system/bin/logd --reinit
    oneshot
    disabled
    user logd
    group logd

# Limit SELinux denial generation to 5/second
service logd-auditctl /system/bin/auditctl -r 5
    oneshot
    disabled
    user logd
    group logd
    capabilities AUDIT_CONTROL

on fs
    write /dev/event-log-tags "# content owned by logd
"
    chown logd logd /dev/event-log-tags
    chmod 0644 /dev/event-log-tags

on property:sys.boot_completed=1
    start logd-auditctl

service adbd /system/bin/adbd --root_seclabel=u:r:su:s0
    class core
    socket adbd seqpacket 660 system system
    disabled
    seclabel u:r:adbd:s0

#TODO(b/179342589): uncomment after turning off APEX session on microdroid
#service apexd /system/bin/apexd
#    interface aidl apexservice
#    class core
#    user root
#    group system
#    oneshot
#    disabled # does not start with the core class
#    reboot_on_failure reboot,apexd-failed

service apexd-bootstrap /system/bin/apexd --bootstrap
    user root
    group system
    oneshot
    disabled
    reboot_on_failure reboot,bootloader,bootstrap-apexd-failed