xref: /aosp_15_r20/system/sepolicy/private/early_virtmgr.te (revision e4a36f4174b17bbab9dc043f4a65dc8d87377290)

is_flag_enabled(RELEASE_AVF_ENABLE_EARLY_VM, `
    # Domain for a child process that manages early VMs available before /data mount, on behalf of
    # its parent.
    type early_virtmgr, domain, coredomain;
    type early_virtmgr_exec, system_file_type, exec_type, file_type;

    use_bootstrap_libs(early_virtmgr)

    # Let early_virtmgr create files and directories inside /mnt/vm/early.
    allow early_virtmgr vm_data_file:dir create_dir_perms;
    allow early_virtmgr vm_data_file:file create_file_perms;
    allow early_virtmgr vm_data_file:sock_file create_file_perms;

    # Allow early_virtmgr to communicate use, read and write over the adb connection.
    allow early_virtmgr adbd:fd use;
    allow early_virtmgr adbd:unix_stream_socket { getattr read write };

    # Allow writing VM logs to the shell console
    allow early_virtmgr devpts:chr_file { read write getattr ioctl };

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

    # When early_virtmgr execs a file with the crosvm_exec label, run it in the crosvm domain.
    domain_auto_trans(early_virtmgr, crosvm_exec, crosvm)

    # Let early_virtmgr kill crosvm.
    allow early_virtmgr crosvm:process sigkill;

    # Allow early_virtmgr to read apex-info-list.xml and access the APEX files listed there.
    allow early_virtmgr apex_info_file:file r_file_perms;
    allow early_virtmgr apex_data_file:dir search;

    # Ignore harmless denials on /proc/self/fd
    dontaudit early_virtmgr self:dir write;

    # Let early_virtmgr to accept vsock connection from the guest VMs
    allow early_virtmgr self:vsock_socket { create_socket_perms_no_ioctl listen accept };

    # Allow early_virtmgr to inspect all hypervisor capabilities.
    get_prop(early_virtmgr, hypervisor_prop)
    get_prop(early_virtmgr, hypervisor_pvmfw_prop)
    get_prop(early_virtmgr, hypervisor_restricted_prop)
    get_prop(early_virtmgr, hypervisor_virtualizationmanager_prop)

    # Allow early_virtmgr to read file system DT for VM reference DT and AVF debug policy
    r_dir_file(early_virtmgr, proc_dt_avf)
    r_dir_file(early_virtmgr, sysfs_dt_avf)

    # early_virtmgr to be client of secretkeeper HAL. It ferries SecretManagement messages from pVM
    # to HAL.
    hal_client_domain(early_virtmgr, hal_secretkeeper);

    # Allow reading files under /proc/[crosvm pid]/, for collecting CPU & memory usage inside VM.
    r_dir_file(early_virtmgr, crosvm);

    # Allow early_virtmgr to:
    # 1) bind to a vsock port less than 1024, because early VMs use static CIDs less than 1024
    # 2) call RLIMIT_MEMLOCK for itself
    allow early_virtmgr self:global_capability_class_set { net_bind_service ipc_lock sys_resource };

    # early_virtmgr may print messages to kmsg_debug_device.
    allow early_virtmgr kmsg_debug_device:chr_file w_file_perms;

    ###
    ### Neverallow rules
    ###

    # Only crosvm and early_virtmgr can access vm_data_file
    neverallow { domain -crosvm -early_virtmgr -init } vm_data_file:dir no_w_dir_perms;
    neverallow { domain -crosvm -early_virtmgr } vm_data_file:file no_rw_file_perms;

    # No other domains can accept vsock connection from the guest VMs
    neverallow { domain -early_virtmgr } early_virtmgr:vsock_socket { accept bind create connect listen };
')