sepolicy: allow shell to read/write traced prop

This is to fix the CTS failures given by the bugs below where devices
where traced is not enabled by default causes test failures.

(cherry picked from commit 673b4db7)

Bug: 78215159
Bug: 78347829
Change-Id: Ib0f6a1cdb770528dbbeb857368534ff5040e464e

private/compat/26.0/26.0.ignore.cil

@@ -109,6 +109,7 @@
     traceur_app_tmpfs
     traced
     traced_consumer_socket
+    traced_enabled_prop
     traced_exec
     traced_probes
     traced_probes_exec

private/compat/27.0/27.0.ignore.cil

@@ -85,6 +85,7 @@
     trace_data_file
     traced
     traced_consumer_socket
+    traced_enabled_prop
     traced_exec
     traced_probes
     traced_probes_exec

private/property_contexts

@@ -59,6 +59,7 @@ persist.sys.audit_safemode      u:object_r:safemode_prop:s0
 persist.service.        u:object_r:system_prop:s0
 persist.service.bdroid. u:object_r:bluetooth_prop:s0
 persist.security.       u:object_r:system_prop:s0
+persist.traced.enable   u:object_r:traced_enabled_prop:s0
 persist.vendor.overlay.  u:object_r:overlay_prop:s0
 ro.boot.vendor.overlay.  u:object_r:overlay_prop:s0
 ro.boottime.             u:object_r:boottime_prop:s0

public/property.te

@@ -51,6 +51,7 @@ type shell_prop, property_type, core_property_type;
 type system_boot_reason_prop, property_type;
 type system_prop, property_type, core_property_type;
 type system_radio_prop, property_type, core_property_type;
+type traced_enabled_prop, property_type;
 type vold_prop, property_type, core_property_type;
 type wifi_log_prop, property_type, log_property_type;
 type wifi_prop, property_type;

public/shell.te

@@ -66,6 +66,9 @@ set_prop(shell, debug_prop)
 set_prop(shell, powerctl_prop)
 set_prop(shell, log_tag_prop)
 set_prop(shell, wifi_log_prop)
+# Allow shell to start/stop traced via the persist.traced.enable
+# property (which also takes care of /data/misc initialization).
+set_prop(shell, traced_enabled_prop)
 # adjust is_loggable properties
 userdebug_or_eng(`set_prop(shell, log_prop)')
 # logpersist script