android10/system/sepolicy/public/vendor_init.te

# vendor_init is its own domain.
type vendor_init, domain, mlstrustedsubject;

# Communication to the main init process
allow vendor_init init:unix_stream_socket { read write };

# Logging to kmsg
allow vendor_init kmsg_device:chr_file { open getattr write };

# Mount on /dev/usb-ffs/adb.
allow vendor_init device:dir mounton;

# Create and remove symlinks in /.
allow vendor_init rootfs:lnk_file { create unlink };

# Create cgroups mount points in tmpfs and mount cgroups on them.
allow vendor_init cgroup:dir create_dir_perms;
allow vendor_init cgroup:file w_file_perms;

# /config
allow vendor_init configfs:dir mounton;
allow vendor_init configfs:dir create_dir_perms;
allow vendor_init configfs:{ file lnk_file } create_file_perms;

# Create directories under /dev/cpuctl after chowning it to system.
allow vendor_init self:global_capability_class_set { dac_override dac_read_search };

# mkdir, symlink, write, rm/rmdir, chown/chmod, restorecon/restorecon_recursive from init.rc files.
# chown/chmod require open+read+setattr required for open()+fchown/fchmod().
# system/core/init.rc requires at least cache_file and data_file_type.
# init.<board>.rc files often include device-specific types, so
# we just allow all file types except /system files here.
allow vendor_init self:global_capability_class_set { chown fowner fsetid };

# mkdir with FBE requires reading /data/unencrypted/{ref,mode}.
allow vendor_init unencrypted_data_file:dir search;
allow vendor_init unencrypted_data_file:file r_file_perms;

# Set encryption policy on dirs in /data
allowxperm vendor_init data_file_type:dir ioctl {
  FS_IOC_GET_ENCRYPTION_POLICY
  FS_IOC_SET_ENCRYPTION_POLICY
};

allow vendor_init system_data_file:dir getattr;

allow vendor_init {
  file_type
  -core_data_file_type
  -exec_type
  -system_file_type
  -mnt_product_file
  -password_slot_metadata_file
  -unlabeled
  -vendor_file_type
  -vold_metadata_file
  -gsi_metadata_file
  -apex_metadata_file
}:dir { create search getattr open read setattr ioctl write add_name remove_name rmdir relabelfrom };

allow vendor_init unlabeled:{ dir notdevfile_class_set } { getattr relabelfrom };

allow vendor_init {
  file_type
  -core_data_file_type
  -exec_type
  -password_slot_metadata_file
  -runtime_event_log_tags_file
  -system_file_type
  -unlabeled
  -vendor_file_type
  -vold_metadata_file
  -gsi_metadata_file
  -apex_metadata_file
}:file { create getattr open read write setattr relabelfrom unlink map };

allow vendor_init {
  file_type
  -core_data_file_type
  -exec_type
  -password_slot_metadata_file
  -system_file_type
  -unlabeled
  -vendor_file_type
  -vold_metadata_file
  -gsi_metadata_file
  -apex_metadata_file
}:{ sock_file fifo_file } { create getattr open read setattr relabelfrom unlink };

allow vendor_init {
  file_type
  -apex_mnt_dir
  -core_data_file_type
  -exec_type
  -password_slot_metadata_file
  -system_file_type
  -unlabeled
  -vendor_file_type
  -vold_metadata_file
  -gsi_metadata_file
  -apex_metadata_file
}:lnk_file { create getattr setattr relabelfrom unlink };

allow vendor_init {
  file_type
  -core_data_file_type
  -exec_type
  -mnt_product_file
  -password_slot_metadata_file
  -system_file_type
  -vendor_file_type
  -vold_metadata_file
  -gsi_metadata_file
  -apex_metadata_file
}:dir_file_class_set relabelto;

allow vendor_init dev_type:dir create_dir_perms;
allow vendor_init dev_type:lnk_file create;

# Disable tracing by writing to /sys/kernel/debug/tracing/tracing_on
allow vendor_init debugfs_tracing:file w_file_perms;

# chown/chmod on pseudo files.
allow vendor_init {
  fs_type
  -contextmount_type
  -keychord_device
  -sdcard_type
  -rootfs
  -proc_uid_time_in_state
  -proc_uid_concurrent_active_time
  -proc_uid_concurrent_policy_time
}:file { open read setattr map };

allow vendor_init {
  fs_type
  -contextmount_type
  -sdcard_type
  -rootfs
  -proc_uid_time_in_state
  -proc_uid_concurrent_active_time
  -proc_uid_concurrent_policy_time
}:dir  { open read setattr search };

# chown/chmod on devices, e.g. /dev/ttyHS0
allow vendor_init {
  dev_type
  -keychord_device
  -port_device
  -lowpan_device
  -hw_random_device
}:chr_file setattr;

allow vendor_init dev_type:blk_file getattr;

# Write to /proc/sys/net/ping_group_range and other /proc/sys/net files.
r_dir_file(vendor_init, proc_net_type)
allow vendor_init proc_net_type:file w_file_perms;
allow vendor_init self:global_capability_class_set net_admin;

# Write to /proc/sys/vm/page-cluster
allow vendor_init proc_page_cluster:file w_file_perms;

# Write to sysfs nodes.
allow vendor_init sysfs_type:dir r_dir_perms;
allow vendor_init sysfs_type:lnk_file read;
allow vendor_init { sysfs_type -sysfs_usermodehelper }:file rw_file_perms;

# setfscreatecon() for labeling directories and socket files.
allow vendor_init self:process { setfscreate };

r_dir_file(vendor_init, vendor_file_type)

# Vendor init can read properties
allow vendor_init serialno_prop:file { getattr open read map };

# Vendor init can perform operations on trusted and security Extended Attributes
allow vendor_init self:global_capability_class_set sys_admin;

# Raw writes to misc block device
allow vendor_init misc_block_device:blk_file w_file_perms;

# vendor_init is using bootstrap bionic
allow vendor_init system_bootstrap_lib_file:dir r_dir_perms;
allow vendor_init system_bootstrap_lib_file:file { execute read open getattr map };

# Everything is labeled as rootfs in recovery mode. Vendor init has to execute
# the dynamic linker and shared libraries.
recovery_only(`
  allow vendor_init rootfs:file { r_file_perms execute };
')

not_compatible_property(`
    set_prop(vendor_init, {
      property_type
      -device_config_activity_manager_native_boot_prop
      -device_config_boot_count_prop
      -device_config_reset_performed_prop
      -device_config_input_native_boot_prop
      -device_config_netd_native_prop
      -device_config_runtime_native_boot_prop
      -device_config_runtime_native_prop
      -device_config_media_native_prop
      -restorecon_prop
      -netd_stable_secret_prop
      -firstboot_prop
      -pm_prop
      -system_boot_reason_prop
      -bootloader_boot_reason_prop
      -last_boot_reason_prop
      -apexd_prop
      -gsid_prop
      -nnapi_ext_deny_product_prop
    })
')

# Get file context
allow vendor_init file_contexts_file:file r_file_perms;

set_prop(vendor_init, bluetooth_a2dp_offload_prop)
set_prop(vendor_init, bluetooth_audio_hal_prop)
set_prop(vendor_init, cpu_variant_prop)
set_prop(vendor_init, debug_prop)
set_prop(vendor_init, exported_audio_prop)
set_prop(vendor_init, exported_bluetooth_prop)
set_prop(vendor_init, exported_config_prop)
set_prop(vendor_init, exported_dalvik_prop)
set_prop(vendor_init, exported_default_prop)
set_prop(vendor_init, exported_ffs_prop)
set_prop(vendor_init, exported_overlay_prop)
set_prop(vendor_init, exported_pm_prop)
set_prop(vendor_init, exported_radio_prop)
set_prop(vendor_init, exported_system_radio_prop)
set_prop(vendor_init, exported_wifi_prop)
set_prop(vendor_init, exported2_config_prop)
set_prop(vendor_init, exported2_system_prop)
set_prop(vendor_init, exported2_vold_prop)
set_prop(vendor_init, exported3_default_prop)
set_prop(vendor_init, exported3_radio_prop)
set_prop(vendor_init, logd_prop)
set_prop(vendor_init, log_tag_prop)
set_prop(vendor_init, log_prop)
set_prop(vendor_init, serialno_prop)
set_prop(vendor_init, vendor_default_prop)
set_prop(vendor_init, vendor_security_patch_level_prop)
set_prop(vendor_init, wifi_log_prop)

get_prop(vendor_init, exported2_radio_prop)
get_prop(vendor_init, exported3_system_prop)
get_prop(vendor_init, theme_prop)

###
### neverallow rules
###

# Vendor init shouldn't communicate with any vendor process, nor most system processes.
neverallow_establish_socket_comms(vendor_init, { domain -init -logd -su -vendor_init });

# The vendor_init domain is only entered via an exec based transition from the
# init domain, never via setcon().
neverallow domain vendor_init:process dyntransition;
neverallow { domain -init } vendor_init:process transition;
neverallow vendor_init { file_type fs_type -init_exec }:file entrypoint;

# Never read/follow symlinks created by shell or untrusted apps.
neverallow vendor_init { app_data_file privapp_data_file }:lnk_file read;
neverallow vendor_init shell_data_file:lnk_file read;
# Init should not be creating subdirectories in /data/local/tmp
neverallow vendor_init shell_data_file:dir { write add_name remove_name };

# init should never execute a program without changing to another domain.
neverallow vendor_init { file_type fs_type }:file execute_no_trans;

# Init never adds or uses services via service_manager.
neverallow vendor_init service_manager_type:service_manager { add find };
neverallow vendor_init servicemanager:service_manager list;

# vendor_init should never be ptraced
neverallow * vendor_init:process ptrace;