private/bpfloader.te

# bpf program loader
type bpfloader, domain;
type bpfloader_exec, system_file_type, exec_type, file_type;
typeattribute bpfloader coredomain;

# allow bpfloader to write to the kernel log (starts early)
allow bpfloader kmsg_device:chr_file w_file_perms;

# These permissions are required to pin ebpf maps & programs.
allow bpfloader { fs_bpf fs_bpf_tethering }:dir { add_name create search write };
allow bpfloader { fs_bpf fs_bpf_tethering }:file { create read setattr };
allow fs_bpf_tethering fs_bpf:filesystem associate;

# Allow bpfloader to create bpf maps and programs.
allow bpfloader self:bpf { map_create map_read map_write prog_load prog_run };

allow bpfloader self:capability { chown sys_admin net_admin };

allow bpfloader sysfs_fs_fuse_bpf:file r_file_perms;

set_prop(bpfloader, bpf_progs_loaded_prop)

allow bpfloader bpfloader_exec:file execute_no_trans;

###
### Neverallow rules
###

# TODO: get rid of init & vendor_init; Note: we don't care about getattr/mounton/search
neverallow { domain -init -vendor_init } { fs_bpf fs_bpf_tethering }:dir { open read setattr };
neverallow { domain -bpfloader } { fs_bpf fs_bpf_tethering }:dir { add_name create write };
neverallow domain { fs_bpf fs_bpf_tethering }:dir ~{ add_name create getattr mounton open read search setattr write };

# TODO: get rid of init & vendor_init
neverallow { domain -bpfloader -init -vendor_init } { fs_bpf fs_bpf_tethering }:file { map open setattr };
neverallow { domain -bpfloader } { fs_bpf fs_bpf_tethering }:file create;
neverallow { domain -bpfloader -gpuservice -init -lmkd -mediaprovider_app -netd -netutils_wrapper -network_stack -system_server -vendor_init } { fs_bpf }:file read;
neverallow { domain -bpfloader -gpuservice -init -lmkd -netd -netutils_wrapper -network_stack -system_server -vendor_init } { fs_bpf_tethering }:file read;
neverallow { domain -bpfloader -gpuservice -netd -netutils_wrapper -network_stack -system_server } { fs_bpf fs_bpf_tethering }:file write;
neverallow domain { fs_bpf fs_bpf_tethering }:file ~{ create map open read setattr write };

neverallow { domain -bpfloader } *:bpf { map_create prog_load };
neverallow { domain -bpfloader -gpuservice -mediaprovider_app -netd -netutils_wrapper -network_stack -system_server } *:bpf prog_run;
neverallow { domain -bpfloader -gpuservice -lmkd -mediaprovider_app -netd -network_stack -system_server } *:bpf { map_read map_write };

neverallow { domain -bpfloader -init } bpfloader_exec:file { execute execute_no_trans };

neverallow bpfloader *:{ tcp_socket udp_socket rawip_socket } *;

# No domain should be allowed to ptrace bpfloader
neverallow { domain userdebug_or_eng(`-llkd') } bpfloader:process ptrace;

# Currently only bpfloader.rc (which runs as init) can do bpf sysctl setup
# this should perhaps be moved to the bpfloader binary itself.  Allow both.
neverallow { domain -bpfloader -init } proc_bpf:file write;