# Networking service app typeattribute network_stack coredomain, mlstrustedsubject; app_domain(network_stack); net_domain(network_stack); allow network_stack self:global_capability_class_set { net_admin net_bind_service net_broadcast net_raw }; # Allow access to net_admin ioctl, DHCP server uses SIOCSARP allowxperm network_stack self:udp_socket ioctl priv_sock_ioctls; # The DhcpClient uses packet_sockets allow network_stack self:packet_socket create_socket_perms_no_ioctl; # Monitor neighbors via netlink. allow network_stack self:netlink_route_socket nlmsg_write; allow network_stack app_api_service:service_manager find; allow network_stack dnsresolver_service:service_manager find; allow network_stack netd_service:service_manager find; allow network_stack network_watchlist_service:service_manager find; allow network_stack radio_service:service_manager find; allow network_stack system_config_service:service_manager find; allow network_stack radio_data_file:dir create_dir_perms; allow network_stack radio_data_file:file create_file_perms; binder_call(network_stack, netd); # in order to invoke side effect of close() on such a socket calling synchronize_rcu() # TODO: Remove this permission when 4.9 kernel is deprecated. allow network_stack self:key_socket create; # Java's Os.close() in libcore/luni/src/main/java/libcore/io/BlockGuardOs.java;l=100 # calls if (fd.isSocket$()) if (isLingerSocket(fd)) ... dontaudit network_stack self:key_socket getopt; # Grant read permission of connectivity namespace system property prefix. get_prop(network_stack, device_config_connectivity_prop) # Create/use netlink_tcpdiag_socket to get tcp info allow network_stack self:netlink_tcpdiag_socket { create_socket_perms_no_ioctl nlmsg_read nlmsg_write }; ############### Tethering Service app - Tethering.apk ############## hal_client_domain(network_stack, hal_tetheroffload) # Create and share netlink_netfilter_sockets for tetheroffload. allow network_stack self:netlink_netfilter_socket create_socket_perms_no_ioctl; allow network_stack network_stack_service:service_manager find; # allow Tethering(network_stack process) to run/update/read the eBPF maps to offload tethering traffic by eBPF. allow network_stack { fs_bpf fs_bpf_tethering }:dir search; allow network_stack { fs_bpf fs_bpf_tethering }:file { read write }; allow network_stack bpfloader:bpf { map_read map_write prog_run }; # Only the bpfloader and the network_stack should ever touch 'fs_bpf_tethering' programs/maps. # Unfortunately init/vendor_init have all sorts of extra privs neverallow { domain -bpfloader -init -network_stack -vendor_init } fs_bpf_tethering:dir ~getattr; neverallow { domain -bpfloader -init -network_stack -vendor_init } fs_bpf_tethering:file *; neverallow { domain -bpfloader -network_stack } fs_bpf_tethering:dir ~{ getattr open read search setattr }; neverallow { domain -bpfloader -network_stack } fs_bpf_tethering:file ~{ map open read setattr };