platform_system_sepolicy/private/composd.te

type composd, domain, coredomain;
type composd_exec, system_file_type, exec_type, file_type;

# Host dynamic AIDL services
init_daemon_domain(composd)
binder_use(composd)
add_service(composd, compos_service)

# Call back into system server
binder_call(composd, system_server)

# Start a VM
virtualizationservice_use(composd)

# Prepare staging directory for odrefresh
allow composd apex_art_data_file:dir { create_dir_perms relabelfrom };
allow composd apex_art_staging_data_file:dir { create_dir_perms relabelto };
allow composd apex_art_staging_data_file:file { getattr unlink };

# Delete files or enable fs-verity in the odrefresh target directory
allow composd apex_art_data_file:file { open ioctl read unlink write };
allowxperm composd apex_art_data_file:file ioctl FS_IOC_ENABLE_VERITY;

# Access our APEX data files
allow composd apex_module_data_file:dir search;
allow composd apex_compos_data_file:dir create_dir_perms;
allow composd apex_compos_data_file:file create_file_perms;

# Run fd_server in its own domain, and send SIGTERM when finished.
domain_auto_trans(composd, fd_server_exec, compos_fd_server)
allow composd compos_fd_server:process signal;

# Read properties used to configure the CompOS VM
get_prop(composd, composd_vm_art_prop)
get_prop(composd, composd_vm_vendor_prop)

# Read ART's properties
get_prop(composd, dalvik_config_prop_type)
get_prop(composd, device_config_runtime_native_boot_prop)

# We never create any artifact files directly
neverallow composd apex_art_data_file:file create;

# ART sets these properties via init script, nothing else should
neverallow { domain -init } composd_vm_art_prop:property_service set;