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platform_system_core/rootdir/init.rc
Eric Biggers 843f46e674 init.rc: disable kernel module autoloading 
There is a longstanding bug where file-based encryption causes spurious
SELinux denials of module_request because it uses the kernel's crypto
API, and the crypto API tries to autoload kernel modules.

While this sometimes indicate missing kconfig options, it can still
happen even if all needed kconfig options are enabled.  This is because
a crypto algorithm can be a composition like "hmac(sha512)", and the
crypto API will first look for the full composition before it
instantiates it using the components like "hmac" and "sha512".  But
often an implementation of the full composition doesn't exist.

However, as far as I can tell, Android doesn't actually use kernel
module autoloading at all.  First, Android never changes
/proc/sys/kernel/modprobe from the default of "/sbin/modprobe", yet this
isn't where modprobe is located on Android.  Android's SELinux policy
contains a neverallow rule that ensures that only init (not even
vendor_init) can write to this setting, so vendors can't be changing it.

Vendors could potentially be setting CONFIG_STATIC_USERMODEHELPER_PATH,
which overrides the path of all usermode helpers including modprobe.
But this is a relatively new kconfig option, available only in
android-4.14 and later.  Also, for a vendor to actually do this they'd
also need to extend the SELinux policy with a domain_auto_trans rule to
allow their usermode helper to be executed by the kernel.

Android does increasingly use kernel modules, and GKI (Generic Kernel
Image) will require them.  However, the modules are actually inserted by
userspace by 'init', not autoloaded.

It's possible to disable kernel module autoloading completely by setting
/proc/sys/kernel/modprobe to an empty string.  So, let's do that.

This prevents lots of spurious SELinux denials, and allows removing
unnecessary rules to allow or dontaudit the module_request permission.

Note: when the kernel doesn't have CONFIG_ANDROID_BINDERFS enabled, this
change exposes a kernel bug that causes a WARNING in get_fs_type().  To
avoid this WARNING, a kernel fix should be applied too -- currently
under discussion upstream
(https://lkml.kernel.org/r/20200310223731.126894-1-ebiggers@kernel.org).

Bug: 130424539
Bug: 132409186
Bug: 144399145
Bug: 146477240
Bug: 148005188
Bug: 149542343

Test: Tested on cuttlefish and coral:

    - Checked that /proc/sys/kernel/modprobe contains /sbin/modprobe
      before this change, and the empty string after.

    - Checked that if all SELinux rules for module_request are removed,
      there are SELinux denials for module_request before this change
      but none after.

    - Ran lsmod both before and after and verified that the list is the
      same, i.e. checked that this change doesn't break how Android
      actually loads kernel modules.

Change-Id: I4132fe1a491e7b789311afcf693c1f6493fb9dc5
2020-03-11 10:01:32 -07:00

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# Copyright (C) 2012 The Android Open Source Project
#
# IMPORTANT: Do not create world writable files or directories.
# This is a common source of Android security bugs.
#
import /init.environ.rc
import /system/etc/init/hw/init.usb.rc
import /init.${ro.hardware}.rc
import /vendor/etc/init/hw/init.${ro.hardware}.rc
import /system/etc/init/hw/init.usb.configfs.rc
import /system/etc/init/hw/init.${ro.zygote}.rc
# Cgroups are mounted right before early-init using list from /etc/cgroups.json
on early-init
# Disable sysrq from keyboard
write /proc/sys/kernel/sysrq 0
# Android doesn't need kernel module autoloading, and it causes SELinux
# denials. So disable it by setting modprobe to the empty string. Note: to
# explicitly set a sysctl to an empty string, a trailing newline is needed.
write /proc/sys/kernel/modprobe \n
# Set the security context of /adb_keys if present.
restorecon /adb_keys
# Set the security context of /postinstall if present.
restorecon /postinstall
mkdir /acct/uid
# memory.pressure_level used by lmkd
chown root system /dev/memcg/memory.pressure_level
chmod 0040 /dev/memcg/memory.pressure_level
# app mem cgroups, used by activity manager, lmkd and zygote
mkdir /dev/memcg/apps/ 0755 system system
# cgroup for system_server and surfaceflinger
mkdir /dev/memcg/system 0550 system system
# symlink the Android specific /dev/tun to Linux expected /dev/net/tun
mkdir /dev/net 0755 root root
symlink ../tun /dev/net/tun
# set RLIMIT_NICE to allow priorities from 19 to -20
setrlimit nice 40 40
# Allow up to 32K FDs per process
setrlimit nofile 32768 32768
# Set up linker config subdirectories based on mount namespaces
mkdir /linkerconfig/bootstrap 0755
mkdir /linkerconfig/default 0755
# Disable dm-verity hash prefetching, since it doesn't help performance
# Read more in b/136247322
write /sys/module/dm_verity/parameters/prefetch_cluster 0
# Generate ld.config.txt for early executed processes
exec -- /system/bin/linkerconfig --target /linkerconfig/bootstrap
chmod 644 /linkerconfig/bootstrap/ld.config.txt
copy /linkerconfig/bootstrap/ld.config.txt /linkerconfig/default/ld.config.txt
chmod 644 /linkerconfig/default/ld.config.txt
# Mount bootstrap linker configuration as current
mount none /linkerconfig/bootstrap /linkerconfig bind rec
start ueventd
# 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
# These must already exist by the time boringssl_self_test32 / boringssl_self_test64 run.
mkdir /dev/boringssl 0755 root root
mkdir /dev/boringssl/selftest 0755 root root
# Run boringssl self test for each ABI so that later processes can skip it. http://b/139348610
on early-init && property:ro.product.cpu.abilist32=*
exec_start boringssl_self_test32
on early-init && property:ro.product.cpu.abilist64=*
exec_start boringssl_self_test64
on property:apexd.status=ready && property:ro.product.cpu.abilist32=*
exec_start boringssl_self_test_apex32
on property:apexd.status=ready && property:ro.product.cpu.abilist64=*
exec_start boringssl_self_test_apex64
service boringssl_self_test32 /system/bin/boringssl_self_test32
setenv BORINGSSL_SELF_TEST_CREATE_FLAG true # Any nonempty value counts as true
reboot_on_failure reboot,boringssl-self-check-failed
stdio_to_kmsg
service boringssl_self_test64 /system/bin/boringssl_self_test64
setenv BORINGSSL_SELF_TEST_CREATE_FLAG true # Any nonempty value counts as true
reboot_on_failure reboot,boringssl-self-check-failed
stdio_to_kmsg
service boringssl_self_test_apex32 /apex/com.android.conscrypt/bin/boringssl_self_test32
setenv BORINGSSL_SELF_TEST_CREATE_FLAG true # Any nonempty value counts as true
reboot_on_failure reboot,boringssl-self-check-failed
stdio_to_kmsg
service boringssl_self_test_apex64 /apex/com.android.conscrypt/bin/boringssl_self_test64
setenv BORINGSSL_SELF_TEST_CREATE_FLAG true # Any nonempty value counts as true
reboot_on_failure reboot,boringssl-self-check-failed
stdio_to_kmsg
on init
sysclktz 0
# Mix device-specific information into the entropy pool
copy /proc/cmdline /dev/urandom
copy /system/etc/prop.default /dev/urandom
symlink /proc/self/fd/0 /dev/stdin
symlink /proc/self/fd/1 /dev/stdout
symlink /proc/self/fd/2 /dev/stderr
# Create energy-aware scheduler tuning nodes
mkdir /dev/stune/foreground
mkdir /dev/stune/background
mkdir /dev/stune/top-app
mkdir /dev/stune/rt
chown system system /dev/stune
chown system system /dev/stune/foreground
chown system system /dev/stune/background
chown system system /dev/stune/top-app
chown system system /dev/stune/rt
chown system system /dev/stune/tasks
chown system system /dev/stune/foreground/tasks
chown system system /dev/stune/background/tasks
chown system system /dev/stune/top-app/tasks
chown system system /dev/stune/rt/tasks
chmod 0664 /dev/stune/tasks
chmod 0664 /dev/stune/foreground/tasks
chmod 0664 /dev/stune/background/tasks
chmod 0664 /dev/stune/top-app/tasks
chmod 0664 /dev/stune/rt/tasks
# Create an stune group for NNAPI HAL processes
mkdir /dev/stune/nnapi-hal
chown system system /dev/stune/nnapi-hal
chown system system /dev/stune/nnapi-hal/tasks
chmod 0664 /dev/stune/nnapi-hal/tasks
write /dev/stune/nnapi-hal/schedtune.boost 1
write /dev/stune/nnapi-hal/schedtune.prefer_idle 1
# Create blkio group and apply initial settings.
# This feature needs kernel to support it, and the
# device's init.rc must actually set the correct values.
mkdir /dev/blkio/background
chown system system /dev/blkio
chown system system /dev/blkio/background
chown system system /dev/blkio/tasks
chown system system /dev/blkio/background/tasks
chmod 0664 /dev/blkio/tasks
chmod 0664 /dev/blkio/background/tasks
write /dev/blkio/blkio.weight 1000
write /dev/blkio/background/blkio.weight 500
write /dev/blkio/blkio.group_idle 0
write /dev/blkio/background/blkio.group_idle 0
restorecon_recursive /mnt
mount configfs none /config nodev noexec nosuid
chmod 0770 /config/sdcardfs
chown system package_info /config/sdcardfs
# 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
mkdir /mnt/secure 0700 root root
mkdir /mnt/secure/asec 0700 root root
mkdir /mnt/asec 0755 root system
mkdir /mnt/obb 0755 root system
mkdir /mnt/media_rw 0750 root external_storage
mkdir /mnt/user 0755 root root
mkdir /mnt/user/0 0755 root root
mkdir /mnt/user/0/self 0755 root root
mkdir /mnt/user/0/emulated 0755 root root
mkdir /mnt/user/0/emulated/0 0755 root root
# Prepare directories for pass through processes
mkdir /mnt/pass_through 0700 root root
mkdir /mnt/pass_through/0 0710 root media_rw
mkdir /mnt/pass_through/0/self 0710 root media_rw
mkdir /mnt/pass_through/0/emulated 0710 root media_rw
mkdir /mnt/pass_through/0/emulated/0 0710 root media_rw
mkdir /mnt/expand 0771 system system
mkdir /mnt/appfuse 0711 root root
# Storage views to support runtime permissions
mkdir /mnt/runtime 0700 root root
mkdir /mnt/runtime/default 0755 root root
mkdir /mnt/runtime/default/self 0755 root root
mkdir /mnt/runtime/read 0755 root root
mkdir /mnt/runtime/read/self 0755 root root
mkdir /mnt/runtime/write 0755 root root
mkdir /mnt/runtime/write/self 0755 root root
mkdir /mnt/runtime/full 0755 root root
mkdir /mnt/runtime/full/self 0755 root root
# Symlink to keep legacy apps working in multi-user world
symlink /storage/self/primary /mnt/sdcard
symlink /mnt/user/0/primary /mnt/runtime/default/self/primary
write /proc/sys/kernel/panic_on_oops 1
write /proc/sys/kernel/hung_task_timeout_secs 0
write /proc/cpu/alignment 4
# scheduler tunables
# Disable auto-scaling of scheduler tunables with hotplug. The tunables
# will vary across devices in unpredictable ways if allowed to scale with
# cpu cores.
write /proc/sys/kernel/sched_tunable_scaling 0
write /proc/sys/kernel/sched_latency_ns 10000000
write /proc/sys/kernel/sched_wakeup_granularity_ns 2000000
write /proc/sys/kernel/sched_child_runs_first 0
write /proc/sys/kernel/randomize_va_space 2
write /proc/sys/vm/mmap_min_addr 32768
write /proc/sys/net/ipv4/ping_group_range "0 2147483647"
write /proc/sys/net/unix/max_dgram_qlen 600
write /proc/sys/kernel/sched_rt_runtime_us 950000
write /proc/sys/kernel/sched_rt_period_us 1000000
# Assign reasonable ceiling values for socket rcv/snd buffers.
# These should almost always be overridden by the target per the
# the corresponding technology maximums.
write /proc/sys/net/core/rmem_max 262144
write /proc/sys/net/core/wmem_max 262144
# reflect fwmark from incoming packets onto generated replies
write /proc/sys/net/ipv4/fwmark_reflect 1
write /proc/sys/net/ipv6/fwmark_reflect 1
# set fwmark on accepted sockets
write /proc/sys/net/ipv4/tcp_fwmark_accept 1
# disable icmp redirects
write /proc/sys/net/ipv4/conf/all/accept_redirects 0
write /proc/sys/net/ipv6/conf/all/accept_redirects 0
# /proc/net/fib_trie leaks interface IP addresses
chmod 0400 /proc/net/fib_trie
# Create cgroup mount points for process groups
chown system system /dev/cpuctl
chown system system /dev/cpuctl/tasks
chmod 0666 /dev/cpuctl/tasks
write /dev/cpuctl/cpu.rt_period_us 1000000
write /dev/cpuctl/cpu.rt_runtime_us 950000
# sets up initial cpusets for ActivityManager
# this ensures that the cpusets are present and usable, but the device's
# init.rc must actually set the correct cpus
mkdir /dev/cpuset/foreground
copy /dev/cpuset/cpus /dev/cpuset/foreground/cpus
copy /dev/cpuset/mems /dev/cpuset/foreground/mems
mkdir /dev/cpuset/background
copy /dev/cpuset/cpus /dev/cpuset/background/cpus
copy /dev/cpuset/mems /dev/cpuset/background/mems
# system-background is for system tasks that should only run on
# little cores, not on bigs
# to be used only by init, so don't change system-bg permissions
mkdir /dev/cpuset/system-background
copy /dev/cpuset/cpus /dev/cpuset/system-background/cpus
copy /dev/cpuset/mems /dev/cpuset/system-background/mems
# restricted is for system tasks that are being throttled
# due to screen off.
mkdir /dev/cpuset/restricted
copy /dev/cpuset/cpus /dev/cpuset/restricted/cpus
copy /dev/cpuset/mems /dev/cpuset/restricted/mems
mkdir /dev/cpuset/top-app
copy /dev/cpuset/cpus /dev/cpuset/top-app/cpus
copy /dev/cpuset/mems /dev/cpuset/top-app/mems
# change permissions for all cpusets we'll touch at runtime
chown system system /dev/cpuset
chown system system /dev/cpuset/foreground
chown system system /dev/cpuset/background
chown system system /dev/cpuset/system-background
chown system system /dev/cpuset/top-app
chown system system /dev/cpuset/restricted
chown system system /dev/cpuset/tasks
chown system system /dev/cpuset/foreground/tasks
chown system system /dev/cpuset/background/tasks
chown system system /dev/cpuset/system-background/tasks
chown system system /dev/cpuset/top-app/tasks
chown system system /dev/cpuset/restricted/tasks
# set system-background to 0775 so SurfaceFlinger can touch it
chmod 0775 /dev/cpuset/system-background
chmod 0664 /dev/cpuset/foreground/tasks
chmod 0664 /dev/cpuset/background/tasks
chmod 0664 /dev/cpuset/system-background/tasks
chmod 0664 /dev/cpuset/top-app/tasks
chmod 0664 /dev/cpuset/restricted/tasks
chmod 0664 /dev/cpuset/tasks
# freezer cgroup entries
mkdir /dev/freezer/frozen
write /dev/freezer/frozen/freezer.state FROZEN
chown system system /dev/freezer/cgroup.procs
chown system system /dev/freezer/frozen
chown system system /dev/freezer/frozen/freezer.state
chown system system /dev/freezer/frozen/cgroup.procs
chmod 0444 /dev/freezer/frozen/freezer.state
# make the PSI monitor accessible to others
chown system system /proc/pressure/memory
chmod 0664 /proc/pressure/memory
# qtaguid will limit access to specific data based on group memberships.
# net_bw_acct grants impersonation of socket owners.
# net_bw_stats grants access to other apps' detailed tagged-socket stats.
chown root net_bw_acct /proc/net/xt_qtaguid/ctrl
chown root net_bw_stats /proc/net/xt_qtaguid/stats
# Allow everybody to read the xt_qtaguid resource tracking misc dev.
# This is needed by any process that uses socket tagging.
chmod 0644 /dev/xt_qtaguid
chown root root /dev/cg2_bpf
chmod 0600 /dev/cg2_bpf
mount bpf bpf /sys/fs/bpf nodev noexec nosuid
# Create location for fs_mgr to store abbreviated output from filesystem
# checker programs.
mkdir /dev/fscklogs 0770 root system
# pstore/ramoops previous console log
mount pstore pstore /sys/fs/pstore nodev noexec nosuid
chown system log /sys/fs/pstore
chmod 0550 /sys/fs/pstore
chown system log /sys/fs/pstore/console-ramoops
chmod 0440 /sys/fs/pstore/console-ramoops
chown system log /sys/fs/pstore/console-ramoops-0
chmod 0440 /sys/fs/pstore/console-ramoops-0
chown system log /sys/fs/pstore/pmsg-ramoops-0
chmod 0440 /sys/fs/pstore/pmsg-ramoops-0
# enable armv8_deprecated instruction hooks
write /proc/sys/abi/swp 1
# Linux's execveat() syscall may construct paths containing /dev/fd
# expecting it to point to /proc/self/fd
symlink /proc/self/fd /dev/fd
export DOWNLOAD_CACHE /data/cache
# This allows the ledtrig-transient properties to be created here so
# that they can be chown'd to system:system later on boot
write /sys/class/leds/vibrator/trigger "transient"
# This is used by Bionic to select optimized routines.
write /dev/cpu_variant:${ro.bionic.arch} ${ro.bionic.cpu_variant}
chmod 0444 /dev/cpu_variant:${ro.bionic.arch}
write /dev/cpu_variant:${ro.bionic.2nd_arch} ${ro.bionic.2nd_cpu_variant}
chmod 0444 /dev/cpu_variant:${ro.bionic.2nd_arch}
# Allow system processes to read / write power state.
chown system system /sys/power/state
chown system system /sys/power/wakeup_count
chmod 0660 /sys/power/state
chown radio wakelock /sys/power/wake_lock
chown radio wakelock /sys/power/wake_unlock
chmod 0660 /sys/power/wake_lock
chmod 0660 /sys/power/wake_unlock
# Start logd before any other services run to ensure we capture all of their logs.
start logd
# Start lmkd before any other services run so that it can register them
chown root system /sys/module/lowmemorykiller/parameters/adj
chmod 0664 /sys/module/lowmemorykiller/parameters/adj
chown root system /sys/module/lowmemorykiller/parameters/minfree
chmod 0664 /sys/module/lowmemorykiller/parameters/minfree
start lmkd
# Start essential services.
start servicemanager
start hwservicemanager
start vndservicemanager
# Healthd can trigger a full boot from charger mode by signaling this
# property when the power button is held.
on property:sys.boot_from_charger_mode=1
class_stop charger
trigger late-init
on load_persist_props_action
load_persist_props
start logd
start logd-reinit
# Indicate to fw loaders that the relevant mounts are up.
on firmware_mounts_complete
rm /dev/.booting
# 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
# Now we can mount /data. File encryption requires keymaster to decrypt
# /data, which in turn can only be loaded when system properties are present.
trigger post-fs-data
# Load persist properties and override properties (if enabled) from /data.
trigger load_persist_props_action
# 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 early-fs
# Once metadata has been mounted, we'll need vold to deal with userdata checkpointing
start vold
on post-fs
exec - system system -- /system/bin/vdc checkpoint markBootAttempt
# 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
# Make sure /sys/kernel/debug (if present) is labeled properly
# Note that tracefs may be mounted under debug, so we need to cross filesystems
restorecon --recursive --cross-filesystems /sys/kernel/debug
# We chown/chmod /cache again so because mount is run as root + defaults
chown system cache /cache
chmod 0770 /cache
# We restorecon /cache in case the cache partition has been reset.
restorecon_recursive /cache
# Create /cache/recovery in case it's not there. It'll also fix the odd
# permissions if created by the recovery system.
mkdir /cache/recovery 0770 system cache
# Backup/restore mechanism uses the cache partition
mkdir /cache/backup_stage 0700 system system
mkdir /cache/backup 0700 system system
#change permissions on vmallocinfo so we can grab it from bugreports
chown root log /proc/vmallocinfo
chmod 0440 /proc/vmallocinfo
chown root log /proc/slabinfo
chmod 0440 /proc/slabinfo
#change permissions on kmsg & sysrq-trigger so bugreports can grab kthread stacks
chown root system /proc/kmsg
chmod 0440 /proc/kmsg
chown root system /proc/sysrq-trigger
chmod 0220 /proc/sysrq-trigger
chown system log /proc/last_kmsg
chmod 0440 /proc/last_kmsg
# make the selinux kernel policy world-readable
chmod 0444 /sys/fs/selinux/policy
# create the lost+found directories, so as to enforce our permissions
mkdir /cache/lost+found 0770 root root
restorecon_recursive /metadata
mkdir /metadata/vold
chmod 0700 /metadata/vold
mkdir /metadata/password_slots 0771 root system
mkdir /metadata/bootstat 0750 system log
mkdir /metadata/ota 0700 root system
mkdir /metadata/ota/snapshots 0700 root system
mkdir /metadata/apex 0700 root system
mkdir /metadata/apex/sessions 0700 root system
on late-fs
# Ensure that tracefs has the correct permissions.
# This does not work correctly if it is called in post-fs.
chmod 0755 /sys/kernel/tracing
chmod 0755 /sys/kernel/debug/tracing
# HALs required before storage encryption can get unlocked (FBE/FDE)
class_start early_hal
on post-fs-data
mark_post_data
# Start checkpoint before we touch data
exec - system system -- /system/bin/vdc checkpoint prepareCheckpoint
# We chown/chmod /data again so because mount is run as root + defaults
chown system system /data
chmod 0771 /data
# We restorecon /data in case the userdata partition has been reset.
restorecon /data
# Make sure we have the device encryption key.
installkey /data
# Start bootcharting as soon as possible after the data partition is
# mounted to collect more data.
mkdir /data/bootchart 0755 shell shell encryption=Require
bootchart start
# Make sure that apexd is started in the default namespace
enter_default_mount_ns
# /data/apex is now available. Start apexd to scan and activate APEXes.
mkdir /data/apex 0750 root system encryption=None
mkdir /data/apex/active 0750 root system
mkdir /data/apex/backup 0700 root system
mkdir /data/apex/hashtree 0700 root system
mkdir /data/apex/sessions 0700 root system
mkdir /data/app-staging 0750 system system encryption=None
start apexd
# Avoid predictable entropy pool. Carry over entropy from previous boot.
copy /data/system/entropy.dat /dev/urandom
# create basic filesystem structure
mkdir /data/misc 01771 system misc encryption=Require
mkdir /data/misc/recovery 0770 system log
copy /data/misc/recovery/ro.build.fingerprint /data/misc/recovery/ro.build.fingerprint.1
chmod 0440 /data/misc/recovery/ro.build.fingerprint.1
chown system log /data/misc/recovery/ro.build.fingerprint.1
write /data/misc/recovery/ro.build.fingerprint ${ro.build.fingerprint}
chmod 0440 /data/misc/recovery/ro.build.fingerprint
chown system log /data/misc/recovery/ro.build.fingerprint
mkdir /data/misc/recovery/proc 0770 system log
copy /data/misc/recovery/proc/version /data/misc/recovery/proc/version.1
chmod 0440 /data/misc/recovery/proc/version.1
chown system log /data/misc/recovery/proc/version.1
copy /proc/version /data/misc/recovery/proc/version
chmod 0440 /data/misc/recovery/proc/version
chown system log /data/misc/recovery/proc/version
mkdir /data/misc/bluedroid 02770 bluetooth bluetooth
# Fix the access permissions and group ownership for 'bt_config.conf'
chmod 0660 /data/misc/bluedroid/bt_config.conf
chown bluetooth bluetooth /data/misc/bluedroid/bt_config.conf
mkdir /data/misc/bluetooth 0770 bluetooth bluetooth
mkdir /data/misc/bluetooth/logs 0770 bluetooth bluetooth
mkdir /data/misc/credstore 0700 credstore credstore
mkdir /data/misc/keystore 0700 keystore keystore
mkdir /data/misc/gatekeeper 0700 system system
mkdir /data/misc/keychain 0771 system system
mkdir /data/misc/net 0750 root shell
mkdir /data/misc/radio 0770 system radio
mkdir /data/misc/sms 0770 system radio
mkdir /data/misc/carrierid 0770 system radio
mkdir /data/misc/apns 0770 system radio
mkdir /data/misc/emergencynumberdb 0770 system radio
mkdir /data/misc/zoneinfo 0775 system system
mkdir /data/misc/network_watchlist 0774 system system
mkdir /data/misc/textclassifier 0771 system system
mkdir /data/misc/vpn 0770 system vpn
mkdir /data/misc/shared_relro 0771 shared_relro shared_relro
mkdir /data/misc/systemkeys 0700 system system
mkdir /data/misc/wifi 0770 wifi wifi
mkdir /data/misc/wifi/sockets 0770 wifi wifi
mkdir /data/misc/wifi/wpa_supplicant 0770 wifi wifi
mkdir /data/misc/ethernet 0770 system system
mkdir /data/misc/dhcp 0770 dhcp dhcp
mkdir /data/misc/user 0771 root root
# give system access to wpa_supplicant.conf for backup and restore
chmod 0660 /data/misc/wifi/wpa_supplicant.conf
mkdir /data/local 0751 root root encryption=Require
mkdir /data/misc/media 0700 media media
mkdir /data/misc/audioserver 0700 audioserver audioserver
mkdir /data/misc/cameraserver 0700 cameraserver cameraserver
mkdir /data/misc/vold 0700 root root
mkdir /data/misc/boottrace 0771 system shell
mkdir /data/misc/update_engine 0700 root root
mkdir /data/misc/update_engine_log 02750 root log
mkdir /data/misc/trace 0700 root root
# create location to store surface and window trace files
mkdir /data/misc/wmtrace 0700 system system
# profile file layout
mkdir /data/misc/profiles 0771 system system
mkdir /data/misc/profiles/cur 0771 system system
mkdir /data/misc/profiles/ref 0770 system system
mkdir /data/misc/profman 0770 system shell
mkdir /data/misc/gcov 0770 root root
mkdir /data/misc/installd 0700 root root
mkdir /data/misc/apexdata 0711 root root
mkdir /data/misc/apexrollback 0700 root root
mkdir /data/misc/snapshotctl_log 0755 root root
# create location to store pre-reboot information
mkdir /data/misc/prereboot 0700 system system
mkdir /data/preloads 0775 system system encryption=None
mkdir /data/vendor 0771 root root encryption=Require
mkdir /data/vendor_ce 0771 root root encryption=None
mkdir /data/vendor_de 0771 root root encryption=None
mkdir /data/vendor/hardware 0771 root root
# For security reasons, /data/local/tmp should always be empty.
# Do not place files or directories in /data/local/tmp
mkdir /data/local/tmp 0771 shell shell
mkdir /data/local/traces 0777 shell shell
mkdir /data/data 0771 system system encryption=None
mkdir /data/app-private 0771 system system encryption=Require
mkdir /data/app-ephemeral 0771 system system encryption=Require
mkdir /data/app-asec 0700 root root encryption=Require
mkdir /data/app-lib 0771 system system encryption=Require
mkdir /data/app 0771 system system encryption=Require
mkdir /data/property 0700 root root encryption=Require
mkdir /data/tombstones 0771 system system encryption=Require
mkdir /data/vendor/tombstones 0771 root root
mkdir /data/vendor/tombstones/wifi 0771 wifi wifi
# create dalvik-cache, so as to enforce our permissions
mkdir /data/dalvik-cache 0771 root root encryption=Require
# create the A/B OTA directory, so as to enforce our permissions
mkdir /data/ota 0771 root root encryption=Require
# create the OTA package directory. It will be accessed by GmsCore (cache
# group), update_engine and update_verifier.
mkdir /data/ota_package 0770 system cache encryption=Require
# create resource-cache and double-check the perms
mkdir /data/resource-cache 0771 system system encryption=Require
chown system system /data/resource-cache
chmod 0771 /data/resource-cache
# create the lost+found directories, so as to enforce our permissions
mkdir /data/lost+found 0770 root root encryption=None
# create directory for DRM plug-ins - give drm the read/write access to
# the following directory.
mkdir /data/drm 0770 drm drm encryption=Require
# create directory for MediaDrm plug-ins - give drm the read/write access to
# the following directory.
mkdir /data/mediadrm 0770 mediadrm mediadrm encryption=Require
mkdir /data/anr 0775 system system encryption=Require
# NFC: create data/nfc for nv storage
mkdir /data/nfc 0770 nfc nfc encryption=Require
mkdir /data/nfc/param 0770 nfc nfc
# Create all remaining /data root dirs so that they are made through init
# and get proper encryption policy installed
mkdir /data/backup 0700 system system encryption=Require
mkdir /data/ss 0700 system system encryption=Require
mkdir /data/system 0775 system system encryption=Require
mkdir /data/system/dropbox 0700 system system
mkdir /data/system/heapdump 0700 system system
mkdir /data/system/users 0775 system system
mkdir /data/system_de 0770 system system encryption=None
mkdir /data/system_ce 0770 system system encryption=None
mkdir /data/misc_de 01771 system misc encryption=None
mkdir /data/misc_ce 01771 system misc encryption=None
mkdir /data/user 0711 system system encryption=None
mkdir /data/user_de 0711 system system encryption=None
# Unlink /data/user/0 if we previously symlink it to /data/data
rm /data/user/0
# Bind mount /data/user/0 to /data/data
mkdir /data/user/0 0700 system system encryption=None
mount none /data/data /data/user/0 bind rec
# A tmpfs directory, which will contain all apps CE DE data directory that
# bind mount from the original source.
mount tmpfs tmpfs /data_mirror nodev noexec nosuid mode=0700,uid=0,gid=1000
restorecon /data_mirror
mkdir /data_mirror/data_ce 0700 root root
mkdir /data_mirror/data_de 0700 root root
# Create CE and DE data directory for default volume
mkdir /data_mirror/data_ce/null 0700 root root
mkdir /data_mirror/data_de/null 0700 root root
# Bind mount CE and DE data directory to mirror's default volume directory
mount none /data/user /data_mirror/data_ce/null bind rec
mount none /data/user_de /data_mirror/data_de/null bind rec
# Create mirror directory for jit profiles
mkdir /data_mirror/cur_profiles 0700 root root
mount none /data/misc/profiles/cur /data_mirror/cur_profiles bind rec
mkdir /data/cache 0770 system cache encryption=Require
mkdir /data/cache/recovery 0770 system cache
mkdir /data/cache/backup_stage 0700 system system
mkdir /data/cache/backup 0700 system system
# Delete these if need be, per b/139193659
mkdir /data/rollback 0700 system system encryption=DeleteIfNecessary
mkdir /data/rollback-observer 0700 system system encryption=DeleteIfNecessary
# Create root dir for Incremental Service
mkdir /data/incremental 0771 system system encryption=Require
# Create directories for statsd
mkdir /data/misc/stats-active-metric/ 0770 statsd system
mkdir /data/misc/stats-data/ 0770 statsd system
mkdir /data/misc/stats-metadata/ 0770 statsd system
mkdir /data/misc/stats-service/ 0770 statsd system
mkdir /data/misc/train-info/ 0770 statsd system
# Wait for apexd to finish activating APEXes before starting more processes.
wait_for_prop apexd.status activated
perform_apex_config
# Special-case /data/media/obb per b/64566063
mkdir /data/media 0770 media_rw media_rw encryption=None
exec - media_rw media_rw -- /system/bin/chattr +F /data/media
mkdir /data/media/obb 0770 media_rw media_rw encryption=Attempt
exec_start derive_sdk
init_user0
# Allow apexd to snapshot and restore device encrypted apex data in the case
# of a rollback. This should be done immediately after DE_user data keys
# are loaded. APEXes should not access this data until this has been
# completed and apexd.status becomes "ready".
exec_start apexd-snapshotde
# Set SELinux security contexts on upgrade or policy update.
restorecon --recursive --skip-ce /data
# Check any timezone data in /data is newer than the copy in the time zone data
# module, delete if not.
exec - system system -- /system/bin/tzdatacheck /apex/com.android.tzdata/etc/tz /data/misc/zoneinfo
# If there is no post-fs-data action in the init.<device>.rc file, you
# must uncomment this line, otherwise encrypted filesystems
# won't work.
# Set indication (checked by vold) that we have finished this action
#setprop vold.post_fs_data_done 1
# sys.memfd_use set to false by default, which keeps it disabled
# until it is confirmed that apps and vendor processes don't make
# IOCTLs on ashmem fds any more.
setprop sys.use_memfd false
# Explicitly disable FUSE
setprop persist.sys.fuse false
# Set fscklog permission
chown root system /dev/fscklogs/log
chmod 0770 /dev/fscklogs/log
# Switch between sdcardfs and FUSE depending on persist property
# TODO: Move this to ro property before launch because FDE devices
# interact with persistent properties differently during boot
on zygote-start && property:persist.sys.fuse=true
# Mount default storage into root namespace
mount none /mnt/user/0 /storage bind rec
mount none none /storage slave rec
on zygote-start && property:persist.sys.fuse=false
# Mount default storage into root namespace
mount none /mnt/runtime/default /storage bind rec
mount none none /storage slave rec
on zygote-start && property:persist.sys.fuse=""
# Mount default storage into root namespace
mount none /mnt/runtime/default /storage bind rec
mount none none /storage slave rec
# It is recommended to put unnecessary data/ initialization from post-fs-data
# to start-zygote in device's init.rc to unblock zygote start.
on zygote-start && property:ro.crypto.state=unencrypted
# A/B update verifier that marks a successful boot.
exec_start update_verifier_nonencrypted
start netd
start zygote
start zygote_secondary
on zygote-start && property:ro.crypto.state=unsupported
# A/B update verifier that marks a successful boot.
exec_start update_verifier_nonencrypted
start netd
start zygote
start zygote_secondary
on zygote-start && property:ro.crypto.state=encrypted && property:ro.crypto.type=file
# A/B update verifier that marks a successful boot.
exec_start update_verifier_nonencrypted
start netd
start zygote
start zygote_secondary
on boot
# basic network init
ifup lo
hostname localhost
domainname localdomain
# IPsec SA default expiration length
write /proc/sys/net/core/xfrm_acq_expires 3600
# Memory management. Basic kernel parameters, and allow the high
# level system server to be able to adjust the kernel OOM driver
# parameters to match how it is managing things.
write /proc/sys/vm/overcommit_memory 1
write /proc/sys/vm/min_free_order_shift 4
# System server manages zram writeback
chown root system /sys/block/zram0/idle
chmod 0664 /sys/block/zram0/idle
chown root system /sys/block/zram0/writeback
chmod 0664 /sys/block/zram0/writeback
# Tweak background writeout
write /proc/sys/vm/dirty_expire_centisecs 200
write /proc/sys/vm/dirty_background_ratio 5
# F2FS tuning. Set cp_interval larger than dirty_expire_centisecs
# to avoid power consumption when system becomes mostly idle. Be careful
# to make it too large, since it may bring userdata loss, if they
# are not aware of using fsync()/sync() to prepare sudden power-cut.
write /sys/fs/f2fs/${dev.mnt.blk.data}/cp_interval 200
write /sys/fs/f2fs/${dev.mnt.blk.data}/gc_urgent_sleep_time 50
# limit discard size to 128MB in order to avoid long IO latency
# for filesystem tuning first (dm or sda)
# Note that, if dm-<num> is used, sda/mmcblk0 should be tuned in vendor/init.rc
write /sys/devices/virtual/block/${dev.mnt.blk.data}/queue/discard_max_bytes 134217728
# Permissions for System Server and daemons.
chown system system /sys/power/autosleep
chown system system /sys/devices/system/cpu/cpufreq/interactive/timer_rate
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/timer_rate
chown system system /sys/devices/system/cpu/cpufreq/interactive/timer_slack
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/timer_slack
chown system system /sys/devices/system/cpu/cpufreq/interactive/min_sample_time
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/min_sample_time
chown system system /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
chown system system /sys/devices/system/cpu/cpufreq/interactive/target_loads
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/target_loads
chown system system /sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load
chown system system /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay
chown system system /sys/devices/system/cpu/cpufreq/interactive/boost
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/boost
chown system system /sys/devices/system/cpu/cpufreq/interactive/boostpulse
chown system system /sys/devices/system/cpu/cpufreq/interactive/input_boost
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/input_boost
chown system system /sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration
chown system system /sys/devices/system/cpu/cpufreq/interactive/io_is_busy
chmod 0660 /sys/devices/system/cpu/cpufreq/interactive/io_is_busy
# Assume SMP uses shared cpufreq policy for all CPUs
chown system system /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
chmod 0660 /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
chown system system /sys/class/leds/vibrator/trigger
chown system system /sys/class/leds/vibrator/activate
chown system system /sys/class/leds/vibrator/brightness
chown system system /sys/class/leds/vibrator/duration
chown system system /sys/class/leds/vibrator/state
chown system system /sys/class/timed_output/vibrator/enable
chown system system /sys/class/leds/keyboard-backlight/brightness
chown system system /sys/class/leds/lcd-backlight/brightness
chown system system /sys/class/leds/button-backlight/brightness
chown system system /sys/class/leds/jogball-backlight/brightness
chown system system /sys/class/leds/red/brightness
chown system system /sys/class/leds/green/brightness
chown system system /sys/class/leds/blue/brightness
chown system system /sys/class/leds/red/device/grpfreq
chown system system /sys/class/leds/red/device/grppwm
chown system system /sys/class/leds/red/device/blink
chown system system /sys/module/sco/parameters/disable_esco
chown system system /sys/kernel/ipv4/tcp_wmem_min
chown system system /sys/kernel/ipv4/tcp_wmem_def
chown system system /sys/kernel/ipv4/tcp_wmem_max
chown system system /sys/kernel/ipv4/tcp_rmem_min
chown system system /sys/kernel/ipv4/tcp_rmem_def
chown system system /sys/kernel/ipv4/tcp_rmem_max
chown root radio /proc/cmdline
# Define default initial receive window size in segments.
setprop net.tcp.default_init_rwnd 60
# Start standard binderized HAL daemons
class_start hal
class_start core
# Requires keystore (currently a core service) to be ready first.
exec -- /system/bin/fsverity_init
on nonencrypted
class_start main
class_start late_start
on property:sys.init_log_level=*
loglevel ${sys.init_log_level}
on charger
class_start charger
on property:vold.decrypt=trigger_load_persist_props
load_persist_props
start logd
start logd-reinit
on property:vold.decrypt=trigger_post_fs_data
trigger post-fs-data
trigger zygote-start
on property:vold.decrypt=trigger_restart_min_framework
# A/B update verifier that marks a successful boot.
exec_start update_verifier
class_start main
on property:vold.decrypt=trigger_restart_framework
# A/B update verifier that marks a successful boot.
exec_start update_verifier
class_start_post_data hal
class_start_post_data core
class_start main
class_start late_start
setprop service.bootanim.exit 0
start bootanim
on property:vold.decrypt=trigger_shutdown_framework
class_reset late_start
class_reset main
class_reset_post_data core
class_reset_post_data hal
on property:sys.boot_completed=1
bootchart stop
# Setup per_boot directory so other .rc could start to use it on boot_completed
exec - system system -- /bin/rm -rf /data/per_boot
mkdir /data/per_boot 0700 system system encryption=Require key=per_boot_ref
# system server cannot write to /proc/sys files,
# and chown/chmod does not work for /proc/sys/ entries.
# So proxy writes through init.
on property:sys.sysctl.extra_free_kbytes=*
write /proc/sys/vm/extra_free_kbytes ${sys.sysctl.extra_free_kbytes}
# "tcp_default_init_rwnd" Is too long!
on property:sys.sysctl.tcp_def_init_rwnd=*
write /proc/sys/net/ipv4/tcp_default_init_rwnd ${sys.sysctl.tcp_def_init_rwnd}
# perf_event_open syscall security:
# Newer kernels have the ability to control the use of the syscall via SELinux
# hooks. init tests for this, and sets sys_init.perf_lsm_hooks to 1 if the
# kernel has the hooks. In this case, the system-wide perf_event_paranoid
# sysctl is set to -1 (unrestricted use), and the SELinux policy is used for
# controlling access. On older kernels, the paranoid value is the only means of
# controlling access. It is normally 3 (allow only root), but the shell user
# can lower it to 1 (allowing thread-scoped pofiling) via security.perf_harden.
on property:sys.init.perf_lsm_hooks=1
write /proc/sys/kernel/perf_event_paranoid -1
on property:security.perf_harden=0 && property:sys.init.perf_lsm_hooks=""
write /proc/sys/kernel/perf_event_paranoid 1
on property:security.perf_harden=1 && property:sys.init.perf_lsm_hooks=""
write /proc/sys/kernel/perf_event_paranoid 3
# Additionally, simpleperf profiler uses debug.* and security.perf_harden
# sysprops to be able to indirectly set these sysctls.
on property:security.perf_harden=0
write /proc/sys/kernel/perf_event_max_sample_rate ${debug.perf_event_max_sample_rate:-100000}
write /proc/sys/kernel/perf_cpu_time_max_percent ${debug.perf_cpu_time_max_percent:-25}
write /proc/sys/kernel/perf_event_mlock_kb ${debug.perf_event_mlock_kb:-516}
# Default values.
on property:security.perf_harden=1
write /proc/sys/kernel/perf_event_max_sample_rate 100000
write /proc/sys/kernel/perf_cpu_time_max_percent 25
write /proc/sys/kernel/perf_event_mlock_kb 516
# on shutdown
# In device's init.rc, this trigger can be used to do device-specific actions
# before shutdown. e.g disable watchdog and mask error handling
## Daemon processes to be run by init.
##
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
on property:ro.debuggable=1
# Give writes to anyone for the trace folder on debug builds.
# The folder is used to store method traces.
chmod 0773 /data/misc/trace
# Give reads to anyone for the window trace folder on debug builds.
chmod 0775 /data/misc/wmtrace
on init && property:ro.debuggable=1
start console
on userspace-reboot-requested
# TODO(b/135984674): reset all necessary properties here.
setprop sys.boot_completed ""
setprop dev.bootcomplete ""
setprop sys.init.updatable_crashing ""
setprop sys.init.updatable_crashing_process_name ""
setprop apexd.status ""
setprop sys.user.0.ce_available ""
setprop sys.shutdown.requested ""
setprop service.bootanim.exit ""
on userspace-reboot-fs-remount
# Make sure that vold is running.
# This is mostly a precaution measure in case vold for some reason wasn't running when
# userspace reboot was initiated.
start vold
exec - system system -- /system/bin/vdc checkpoint resetCheckpoint
exec - system system -- /system/bin/vdc checkpoint markBootAttempt
remount_userdata
start bootanim
on userspace-reboot-resume
trigger userspace-reboot-fs-remount
trigger post-fs-data
trigger zygote-start
trigger early-boot
trigger boot
on property:sys.boot_completed=1 && property:sys.init.userspace_reboot.in_progress=1
setprop sys.init.userspace_reboot.in_progress ""
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