1# Perfetto user-space tracing daemon (unprivileged) 2type traced_exec, system_file_type, exec_type, file_type; 3 4# Allow init to exec the daemon. 5init_daemon_domain(traced) 6tmpfs_domain(traced) 7 8# Allow apps in other MLS contexts (for multi-user) to access 9# share memory buffers created by traced. 10typeattribute traced_tmpfs mlstrustedobject; 11 12# Allow traced to start with a lower scheduling class and change 13# class accordingly to what defined in the config provided by 14# the privileged process that controls it. 15allow traced self:global_capability_class_set { sys_nice }; 16 17# Allow to pass a file descriptor for the output trace from "perfetto" (the 18# cmdline client) and other shell binaries to traced and let traced write 19# directly into that (rather than returning the trace contents over the socket). 20allow traced perfetto:fd use; 21allow traced shell:fd use; 22allow traced shell:fifo_file { read write }; 23 24# Allow the service to create new files within /data/misc/perfetto-traces. 25allow traced perfetto_traces_data_file:file create_file_perms; 26allow traced perfetto_traces_data_file:dir rw_dir_perms; 27 28# Allow traceur to pass open file descriptors to traced, so traced can directly 29# write into the output file without doing roundtrips over IPC. 30allow traced traceur_app:fd use; 31allow traced trace_data_file:file { read write }; 32 33# Allow perfetto to access the proxy service for notifying Traceur. 34allow traced tracingproxy_service:service_manager find; 35binder_use(traced); 36binder_call(traced, system_server); 37 38# Allow traced to use shared memory supplied by producers. Typically, traced 39# (i.e. the tracing service) creates the shared memory used for data transfer 40# from the producer. This rule allows an alternative scheme, where the producer 41# creates the shared memory, that is then adopted by traced (after validating 42# that it is appropriately sealed). 43# This list has to replicate the tmpfs domains of all applicable domains that 44# have perfetto_producer() macro applied to them. 45# perfetto_tmpfs excluded as it should never need to use the producer-supplied 46# shared memory scheme. 47allow traced { 48 appdomain_tmpfs 49 heapprofd_tmpfs 50 surfaceflinger_tmpfs 51 traced_probes_tmpfs 52 userdebug_or_eng(`system_server_tmpfs') 53}:file { getattr map read write }; 54 55# Allow traced to notify Traceur when a trace ends by setting the 56# sys.trace.trace_end_signal property. 57set_prop(traced, system_trace_prop) 58# Allow to lazily start producers. 59set_prop(traced, traced_lazy_prop) 60# Allow tracking the count of sessions intercepting Java OutOfMemoryError 61# If there are such tracing sessions and an OutOfMemoryError is thrown by ART, 62# the hprof plugin intercepts the error, lazily registers a data source to 63# traced and collects a heap dump. 64set_prop(traced, traced_oome_heap_session_count_prop) 65 66# Allow traced to talk to statsd for logging metrics. 67unix_socket_send(traced, statsdw, statsd) 68 69### 70### Neverallow rules 71### 72### traced should NEVER do any of this 73 74# Disallow mapping executable memory (execstack and exec are already disallowed 75# globally in domain.te). 76neverallow traced self:process execmem; 77 78# Block device access. 79neverallow traced dev_type:blk_file { read write }; 80 81# ptrace any other process 82neverallow traced domain:process ptrace; 83 84# Disallows access to /data files, still allowing to write to file descriptors 85# passed through the socket. 86neverallow traced { 87 data_file_type 88 -perfetto_traces_data_file 89 -system_data_file 90 -system_data_root_file 91 -media_userdir_file 92 -system_userdir_file 93 -vendor_userdir_file 94 # TODO(b/72998741) Remove vendor_data_file exemption. Further restricted in a 95 # subsequent neverallow. Currently only getattr and search are allowed. 96 -vendor_data_file 97 with_native_coverage(`-method_trace_data_file') 98}:dir *; 99neverallow traced { system_data_file }:dir ~{ getattr search }; 100neverallow traced { 101 data_file_type 102 -perfetto_traces_data_file 103 -trace_data_file 104 with_native_coverage(`-method_trace_data_file') 105}:file ~write; 106 107# Only init is allowed to enter the traced domain via exec() 108neverallow { domain -init } traced:process transition; 109neverallow * traced:process dyntransition; 110 111# Limit the processes that can access tracingproxy_service. 112neverallow { 113 domain 114 -traced 115 -dumpstate 116 -traceur_app 117 -shell 118 -system_server 119 -perfetto 120} tracingproxy_service:service_manager find; 121