platform_system_sepolicy/private/virtualizationservice.te

type virtualizationservice, domain, coredomain;
type virtualizationservice_exec, system_file_type, exec_type, file_type;

# The domain needs to be a 'mlstrustedsubject' to change the memlock rlimit of
# the virtualizationmanager domain running at a more constrained MLS level.
typeattribute virtualizationservice mlstrustedsubject;

# When init runs a file labelled with virtualizationservice_exec, run it in the
# virtualizationservice domain.
init_daemon_domain(virtualizationservice)

# Let the virtualizationservice domain use Binder.
binder_use(virtualizationservice)

# Let the virtualizationservice domain register the virtualization_service with ServiceManager.
add_service(virtualizationservice, virtualization_service)

# Let virtualizationservice find and communicate with vfio_handler.
allow virtualizationservice vfio_handler_service:service_manager find;
binder_call(virtualizationservice, vfio_handler)

# Allow calling into the system server to find "permission_service".
binder_call(virtualizationservice, system_server)
allow virtualizationservice permission_service:service_manager find;

# Let virtualizationservice remove memlock rlimit of virtualizationmanager. This is necessary
# to mlock VM memory and page tables.
allow virtualizationservice self:capability sys_resource;
allow virtualizationservice virtualizationmanager:process setrlimit;

# Let virtualizationservice set the owner of a VM's temporary directory.
allow virtualizationservice self:capability chown;

# Let virtualizationservice create and delete temporary directories of VMs. To remove old
# directories, it needs the permission to unlink the files created by virtualizationmanager.
allow virtualizationservice virtualizationservice_data_file:dir create_dir_perms;
allow virtualizationservice virtualizationservice_data_file:{ file sock_file } unlink;
allow virtualizationservice virtualizationservice_data_file:file write;

# Allow to use fd (e.g. /dev/pts/0) inherited from adbd so that we can redirect output from
# crosvm to the console
allow virtualizationservice adbd:fd use;
allow virtualizationservice adbd:unix_stream_socket { read write };

# Let virtualizationservice to accept vsock connection from the guest VMs to singleton services
# such as the guest tombstone server.
allow virtualizationservice self:vsock_socket { create_socket_perms_no_ioctl listen accept };

# Allow virtualizationservice to read/write its own sysprop. Only the process can do so.
set_prop(virtualizationservice, virtualizationservice_prop)

# Allow writing stats to statsd
unix_socket_send(virtualizationservice, statsdw, statsd)

# Allow virtualization service to talk to tombstoned to push guest tombstones
unix_socket_connect(virtualizationservice, tombstoned_crash, tombstoned)

# Append to tombstone files passed as fds from tombstoned
allow virtualizationservice tombstone_data_file:file { append getattr };
allow virtualizationservice tombstoned:fd use;

# Allow virtualizationservice to check if VFIO is supported
allow virtualizationservice vfio_device:chr_file getattr;
allow virtualizationservice vfio_device:dir r_dir_perms;

# Allow virtualizationservice to access VM DTBO via a file created by virtualizationmanager.
allow virtualizationservice virtualizationmanager:fd use;

neverallow {
  domain
  -init
  -virtualizationservice
} virtualizationservice_prop:property_service set;

neverallow {
  domain
  -init
  -virtualizationmanager
  -virtualizationservice
} virtualizationservice_data_file:file { open create };

neverallow virtualizationservice {
  domain
  -virtualizationmanager
  -virtualizationservice
}:process setrlimit;

# Only virtualizationservice can communicate to vfio_handler
neverallow { domain -virtualizationservice -servicemanager } vfio_handler:binder call;