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)

# Register our services with ServiceManager.
add_service(virtualizationservice, virtualization_service)
is_flag_enabled(RELEASE_AVF_ENABLE_LLPVM_CHANGES, `
    add_service(virtualizationservice, virtualization_maintenance_service)
')

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

is_flag_enabled(RELEASE_AVF_ENABLE_NETWORK, `
    # Let virtualizationservice find and communicate with vmnic.
    allow virtualizationservice vmnic_service:service_manager find;
    binder_call(virtualizationservice, vmnic)
')

# Allow the virtualizationservice domain to serve a remotely provisioned component for
# pVM remote attestation.
hal_server_domain(virtualizationservice, hal_remotelyprovisionedcomponent_avf)

# Allow the virtualizationservice to inspect whether remote attestation is supported
# through the system property.
get_prop(virtualizationservice, avf_virtualizationservice_prop)

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

# Allow virtualizationservice to retrieve the remotely provisioned keys from rkpd.
binder_call(virtualizationservice, remote_provisioning_service_server)
allow virtualizationservice remote_provisioning_service:service_manager find;

# Allow virtualizationservice to manage VM secrets via Secretkeeper.
hal_client_domain(virtualizationservice, hal_secretkeeper)

# 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;

is_flag_enabled(RELEASE_AVF_SUPPORT_CUSTOM_VM_WITH_PARAVIRTUALIZED_DEVICES, `
  # To provide display service to an app to get surface.
  # TODO(b/332677707): remove them when display service uses binder RPC.
  allow virtualizationservice vmlauncher_app:binder transfer;
')

# 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:sock_file unlink;
allow virtualizationservice virtualizationservice_data_file:file create_file_perms;

# 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 };

# Allow to connnect to and run VirtMgr to start the service VM for remote attestation.
virtualizationservice_use(virtualizationservice)

# Allow virtualizationservice to read and write in the apex data directory
# /data/misc/apexdata/com.android.virt. Also allow checking of the parent directory
# (needed for SQLite database creation).
allow virtualizationservice apex_module_data_file:dir { search getattr };
allow virtualizationservice apex_virt_data_file:dir create_dir_perms;
allow virtualizationservice apex_virt_data_file:file create_file_perms;

# Accept vsock connection from the guest VMs to singleton services
# such as the guest tombstone server.
allow virtualizationservice self:vsock_socket { create read getattr write setattr lock append bind getopt setopt shutdown map listen accept };
neverallow { domain -virtualizationservice -dumpstate } virtualizationservice:vsock_socket *;

# 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;

# Allow virtualizationservice to access vendor_configs_file to get the list of assignable devices.
r_dir_file(virtualizationservice, vendor_configs_file)

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
  # TODO(b/332677707): remove them when display service uses binder RPC.
  is_flag_enabled(RELEASE_AVF_SUPPORT_CUSTOM_VM_WITH_PARAVIRTUALIZED_DEVICES, `-crosvm')
}:process setrlimit;

is_flag_enabled(RELEASE_AVF_ENABLE_NETWORK, `
    # Allow virtualizationservice to deal with file descriptors of TAP interfaces.
    allow virtualizationservice tun_device:chr_file rw_file_perms;
    allow virtualizationservice vmnic:fd use;
')

is_flag_enabled(RELEASE_AVF_ENABLE_DEVICE_ASSIGNMENT, `
    # Only virtualizationservice and virtualizationmanager can communicate to vfio_handler
    neverallow { domain -virtualizationmanager -virtualizationservice -servicemanager } vfio_handler:binder call;
')