1f448fcf50
This is required for the android.sdk_sysprop_guard data source implemented in traced's builtin producers to set the system properties that guard Skia's inititialization of the Perfetto SDK and track_event data source in SurfaceFlinger/RenderEngine and HWUI apps. Bug: 279614916 Test: presubmit? Change-Id: Ia04014336e86672e54c21883533afe70fcb83e84
125 lines
4.5 KiB
Text
125 lines
4.5 KiB
Text
# Perfetto user-space tracing daemon (unprivileged)
|
|
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;
|
|
|
|
# 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 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 setting debug properties which guard initialization of the Perfetto SDK
|
|
# in SurfaceFlinger and HWUI's copy of Skia.
|
|
# Required for the android.sdk_sysprop_guard data source.
|
|
# TODO(b/281329340): remove this when no longer needed.
|
|
set_prop(traced, debug_prop)
|
|
# 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 tracking the count of sessions intercepting Java OutOfMemoryError
|
|
# If there are such tracing sessions and an OutOfMemoryError is thrown by ART,
|
|
# the hprof plugin intercepts the error, lazily registers a data source to
|
|
# traced and collects a heap dump.
|
|
set_prop(traced, traced_oome_heap_session_count_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
|
|
-system_data_file
|
|
-system_data_root_file
|
|
-media_userdir_file
|
|
-system_userdir_file
|
|
-vendor_userdir_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
|
|
with_native_coverage(`-method_trace_data_file')
|
|
}:dir *;
|
|
neverallow traced { system_data_file }:dir ~{ getattr search };
|
|
neverallow traced {
|
|
data_file_type
|
|
-perfetto_traces_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
|
|
-perfetto
|
|
} tracingproxy_service:service_manager find;
|