1 files changed, 121 insertions, 0 deletions
diff --git a/prebuilts/api/32.0/private/traced.te b/prebuilts/api/32.0/private/traced.te
new file mode 100644
index 000000000..fc9a2455a
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+++ b/prebuilts/api/32.0/private/traced.te
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+# Perfetto user-space tracing daemon (unprivileged)
+
+# type traced is defined under /public (because iorapd rules
+# under public/ need to refer to it).
+type traced_exec, system_file_type, exec_type, file_type;
+
+# Allow init to exec the daemon.
+init_daemon_domain(traced)
+tmpfs_domain(traced)
+
+# Allow apps in other MLS contexts (for multi-user) to access
+# share memory buffers created by traced.
+typeattribute traced_tmpfs mlstrustedobject;
+
+# Allow traced to start with a lower scheduling class and change
+# class accordingly to what defined in the config provided by
+# the privileged process that controls it.
+allow traced self:global_capability_class_set { sys_nice };
+
+# Allow to pass a file descriptor for the output trace from "perfetto" (the
+# cmdline client) and other shell binaries to traced and let traced write
+# directly into that (rather than returning the trace contents over the socket).
+allow traced perfetto:fd use;
+allow traced shell:fd use;
+allow traced shell:fifo_file { read write };
+
+# Allow the service to create new files within /data/misc/perfetto-traces.
+allow traced perfetto_traces_data_file:file create_file_perms;
+allow traced perfetto_traces_data_file:dir rw_dir_perms;
+# ... and /data/misc/perfetto-traces/bugreport*
+allow traced perfetto_traces_bugreport_data_file:file create_file_perms;
+allow traced perfetto_traces_bugreport_data_file:dir rw_dir_perms;
+
+# Allow traceur to pass open file descriptors to traced, so traced can directly
+# write into the output file without doing roundtrips over IPC.
+allow traced traceur_app:fd use;
+allow traced trace_data_file:file { read write };
+
+# Allow perfetto to access the proxy service for notifying Traceur.
+allow traced tracingproxy_service:service_manager find;
+binder_use(traced);
+binder_call(traced, system_server);
+
+# Allow iorapd to pass memfd descriptors to traced, so traced can directly
+# write into the shmem buffer file without doing roundtrips over IPC.
+allow traced iorapd:fd use;
+allow traced iorapd_tmpfs:file { read write };
+
+# Allow traced to use shared memory supplied by producers. Typically, traced
+# (i.e. the tracing service) creates the shared memory used for data transfer
+# from the producer. This rule allows an alternative scheme, where the producer
+# creates the shared memory, that is then adopted by traced (after validating
+# that it is appropriately sealed).
+# This list has to replicate the tmpfs domains of all applicable domains that
+# have perfetto_producer() macro applied to them.
+# perfetto_tmpfs excluded as it should never need to use the producer-supplied
+# shared memory scheme.
+allow traced  {
+  appdomain_tmpfs
+  heapprofd_tmpfs
+  surfaceflinger_tmpfs
+  traced_probes_tmpfs
+  userdebug_or_eng(`system_server_tmpfs')
+}:file { getattr map read write };
+
+# Allow traced to notify Traceur when a trace ends by setting the
+# sys.trace.trace_end_signal property.
+set_prop(traced, system_trace_prop)
+# Allow to lazily start producers.
+set_prop(traced, traced_lazy_prop)
+
+# Allow traced to talk to statsd for logging metrics.
+unix_socket_send(traced, statsdw, statsd)
+
+###
+### Neverallow rules
+###
+### traced should NEVER do any of this
+
+# Disallow mapping executable memory (execstack and exec are already disallowed
+# globally in domain.te).
+neverallow traced self:process execmem;
+
+# Block device access.
+neverallow traced dev_type:blk_file { read write };
+
+# ptrace any other process
+neverallow traced domain:process ptrace;
+
+# Disallows access to /data files, still allowing to write to file descriptors
+# passed through the socket.
+neverallow traced {
+  data_file_type
+  -perfetto_traces_data_file
+  -perfetto_traces_bugreport_data_file
+  -system_data_file
+  -system_data_root_file
+  # TODO(b/72998741) Remove vendor_data_file exemption. Further restricted in a
+  # subsequent neverallow. Currently only getattr and search are allowed.
+  -vendor_data_file
+  -zoneinfo_data_file
+  with_native_coverage(`-method_trace_data_file')
+}:dir *;
+neverallow traced { system_data_file }:dir ~{ getattr search };
+neverallow traced zoneinfo_data_file:dir ~r_dir_perms;
+neverallow traced { data_file_type -zoneinfo_data_file }:lnk_file *;
+neverallow traced {
+  data_file_type
+  -zoneinfo_data_file
+  -perfetto_traces_data_file
+  -perfetto_traces_bugreport_data_file
+  -trace_data_file
+  with_native_coverage(`-method_trace_data_file')
+}:file ~write;
+
+# Only init is allowed to enter the traced domain via exec()
+neverallow { domain -init } traced:process transition;
+neverallow * traced:process dyntransition;
+
+# Limit the processes that can access tracingproxy_service.
+neverallow { domain -traced -dumpstate -traceur_app -shell -system_server } tracingproxy_service:service_manager find;