private/vfio_handler.te

# vfio_handler is a helper service for VFIO tasks, like binding platform devices to VFIO driver.
# vfio_handler is separate from virtualizationservice as VFIO tasks require root.
type vfio_handler, domain, coredomain;
type vfio_handler_exec, system_file_type, exec_type, file_type;

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

# Let the vfio_handler domain register the vfio_handler_service with ServiceManager.
add_service(vfio_handler, vfio_handler_service)

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

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

# Allow vfio_handler to bind/unbind platform devices
allow vfio_handler sysfs:dir r_dir_perms;
allow vfio_handler sysfs:file rw_file_perms;

# Allow vfio_handler to write to VM DTBO via a file created by virtualizationservice.
allow vfio_handler virtualizationservice:fd use;
allow vfio_handler virtualizationservice_data_file:file write;

# vfio_handler can only use fd from virtualizationservice, and can't open files itself
neverallow vfio_handler virtualizationservice_data_file:file { open create };

# Allow vfio_handler to search /dev/block for accessing dtbo.img
allow vfio_handler block_device:dir search;
allow vfio_handler dtbo_block_device:blk_file r_file_perms;

# Only vfio_handler can add vfio_handler_service
neverallow { domain -vfio_handler } vfio_handler_service:service_manager add;