platform_system_sepolicy/update_engine.te

# Domain for update_engine daemon.
type update_engine, domain, domain_deprecated;
type update_engine_exec, exec_type, file_type;
type update_engine_data_file, file_type, data_file_type;

init_daemon_domain(update_engine);
net_domain(update_engine);

# Following permissions are needed for update_engine.
allow update_engine self:process { setsched };
allow update_engine self:capability { fowner sys_admin };
allow update_engine kmsg_device:chr_file w_file_perms;
allow update_engine update_engine_exec:file rx_file_perms;
wakelock_use(update_engine);

# Allow using persistent storage in /data/misc/update_engine.
allow update_engine update_engine_data_file:dir { create_dir_perms };
allow update_engine update_engine_data_file:file { create_file_perms };

# Allow update_engine to reach block devices in /dev/block.
allow update_engine block_device:dir search;

# Allow read/write on system and boot partitions.
allow update_engine boot_block_device:blk_file rw_file_perms;
allow update_engine system_block_device:blk_file rw_file_perms;

# Don't allow kernel module loading, just silence the logs.
dontaudit update_engine kernel:system module_request;

# Register the service to perform Binder IPC.
binder_use(update_engine)
allow update_engine update_engine_service:service_manager { add };

# Allow update_engine to call the callback function provided by priv_app.
binder_call(update_engine, priv_app)