microdroid/system/public/vendor_init.te

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

# 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;
allow vendor_init cgroup_v2:dir create_dir_perms;
allow vendor_init cgroup_v2: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 };

allow vendor_init system_data_file:dir getattr;

allow vendor_init {
  file_type
  -exec_type
  -system_file_type
  -unlabeled
  -vendor_file_type
}: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
  -exec_type
  -runtime_event_log_tags_file
  -system_file_type
  -unlabeled
  -vendor_file_type
  -apex_info_file
  enforce_debugfs_restriction(`-debugfs_type')
}:file { create getattr open read write setattr relabelfrom unlink map };

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

allow vendor_init {
  file_type
  -apex_mnt_dir
  -exec_type
  -system_file_type
  -unlabeled
  -vendor_file_type
}:lnk_file { create getattr setattr relabelfrom unlink };

allow vendor_init {
  file_type
  -exec_type
  -system_file_type
  -vendor_file_type
}: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
  -fusefs_type
  -rootfs
  -proc_uid_time_in_state
  -proc_uid_concurrent_active_time
  -proc_uid_concurrent_policy_time
  enforce_debugfs_restriction(`-debugfs_type')
}:file { open read setattr map };

allow vendor_init tracefs_type:file { open read setattr map };

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

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 perform operations on trusted and security Extended Attributes
allow vendor_init self:global_capability_class_set sys_admin;

# vendor_init is using bootstrap bionic
use_bootstrap_libs(vendor_init)

# Get file context
allow vendor_init file_contexts_file:file r_file_perms;

# Allow vendor_init to (re)set nice
allow vendor_init self:capability sys_nice;

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