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 setting debug properties which guard initialization of the Perfetto SDK 56# in SurfaceFlinger and HWUI's copy of Skia. 57# Required for the android.sdk_sysprop_guard data source. 58# TODO(b/281329340): remove this when no longer needed. 59set_prop(traced, debug_prop) 60# Allow traced to notify Traceur when a trace ends by setting the 61# sys.trace.trace_end_signal property. 62set_prop(traced, system_trace_prop) 63# Allow to lazily start producers. 64set_prop(traced, traced_lazy_prop) 65# Allow tracking the count of sessions intercepting Java OutOfMemoryError 66# If there are such tracing sessions and an OutOfMemoryError is thrown by ART, 67# the hprof plugin intercepts the error, lazily registers a data source to 68# traced and collects a heap dump. 69set_prop(traced, traced_oome_heap_session_count_prop) 70 71# Allow traced to talk to statsd for logging metrics. 72unix_socket_send(traced, statsdw, statsd) 73 74### 75### Neverallow rules 76### 77### traced should NEVER do any of this 78 79# Disallow mapping executable memory (execstack and exec are already disallowed 80# globally in domain.te). 81neverallow traced self:process execmem; 82 83# Block device access. 84neverallow traced dev_type:blk_file { read write }; 85 86# ptrace any other process 87neverallow traced domain:process ptrace; 88 89# Disallows access to /data files, still allowing to write to file descriptors 90# passed through the socket. 91neverallow traced { 92 data_file_type 93 -perfetto_traces_data_file 94 -system_data_file 95 -system_data_root_file 96 -media_userdir_file 97 -system_userdir_file 98 -vendor_userdir_file 99 # TODO(b/72998741) Remove vendor_data_file exemption. Further restricted in a 100 # subsequent neverallow. Currently only getattr and search are allowed. 101 -vendor_data_file 102 with_native_coverage(`-method_trace_data_file') 103}:dir *; 104neverallow traced { system_data_file }:dir ~{ getattr search }; 105neverallow traced { 106 data_file_type 107 -perfetto_traces_data_file 108 -trace_data_file 109 with_native_coverage(`-method_trace_data_file') 110}:file ~write; 111 112# Only init is allowed to enter the traced domain via exec() 113neverallow { domain -init } traced:process transition; 114neverallow * traced:process dyntransition; 115 116# Limit the processes that can access tracingproxy_service. 117neverallow { 118 domain 119 -traced 120 -dumpstate 121 -traceur_app 122 -shell 123 -system_server 124 -perfetto 125} tracingproxy_service:service_manager find; 126