Add microdroid specific sepolicy
Microdroid will have a separate sepolicy, apart from the core policy.
This is the first step; For now it's a simple copy of system/sepolicy.
For the future work, it will be stripped.
Bug: 189165759
Test: boot microdroid and see selinux enforced
Change-Id: I2fee39f7231560b49c93bd5e8d0feeffada40938
diff --git a/microdroid/sepolicy/system/private/atrace.te b/microdroid/sepolicy/system/private/atrace.te
new file mode 100644
index 0000000..d4aed40
--- /dev/null
+++ b/microdroid/sepolicy/system/private/atrace.te
@@ -0,0 +1,79 @@
+# Domain for atrace process.
+# It is spawned either by traced_probes or by init for the boottrace service.
+
+type atrace_exec, exec_type, file_type, system_file_type;
+
+# boottrace services uses /data/misc/boottrace/categories
+allow atrace boottrace_data_file:dir search;
+allow atrace boottrace_data_file:file r_file_perms;
+
+# Allow atrace to access tracefs.
+allow atrace debugfs_tracing:dir r_dir_perms;
+allow atrace debugfs_tracing:file rw_file_perms;
+allow atrace debugfs_trace_marker:file getattr;
+
+# Allow atrace to write data when a pipe is used for stdout/stderr
+# This is used by Perfetto to capture the output on error in atrace.
+allow atrace traced_probes:fd use;
+allow atrace traced_probes:fifo_file write;
+
+# atrace sets debug.atrace.* properties
+set_prop(atrace, debug_prop)
+
+# atrace pokes all the binder-enabled processes at startup with a
+# SYSPROPS_TRANSACTION, to tell them to reload the debug.atrace.* properties.
+
+# Allow discovery of binder services.
+allow atrace {
+ service_manager_type
+ -apex_service
+ -incident_service
+ -iorapd_service
+ -netd_service
+ -dnsresolver_service
+ -stats_service
+ -dumpstate_service
+ -installd_service
+ -vold_service
+ -lpdump_service
+ -default_android_service
+}:service_manager { find };
+allow atrace servicemanager:service_manager list;
+
+# Allow notifying the processes hosting specific binder services that
+# trace-related system properties have changed.
+binder_use(atrace)
+allow atrace healthd:binder call;
+allow atrace surfaceflinger:binder call;
+allow atrace system_server:binder call;
+allow atrace cameraserver:binder call;
+
+# Similarly, on debug builds, allow specific HALs to be notified that
+# trace-related system properties have changed.
+userdebug_or_eng(`
+ # List HAL interfaces.
+ allow atrace hwservicemanager:hwservice_manager list;
+ # Notify the camera HAL.
+ hal_client_domain(atrace, hal_camera)
+ hal_client_domain(atrace, hal_vibrator)
+')
+
+# Remove logspam from notification attempts to non-allowlisted services.
+dontaudit atrace hwservice_manager_type:hwservice_manager find;
+dontaudit atrace service_manager_type:service_manager find;
+dontaudit atrace domain:binder call;
+
+# atrace can call atrace HAL
+hal_client_domain(atrace, hal_atrace)
+
+get_prop(atrace, hwservicemanager_prop)
+
+userdebug_or_eng(`
+ # atrace is generally invoked as a standalone binary from shell or perf
+ # daemons like Perfetto traced_probes. However, in userdebug builds, there is
+ # a further option to run atrace as an init daemon for boot tracing.
+ init_daemon_domain(atrace)
+
+ allow atrace debugfs_tracing_debug:dir r_dir_perms;
+ allow atrace debugfs_tracing_debug:file rw_file_perms;
+')