Build: Add option to restrict sanitization by owner

Add Make variable SANITIZE_NEVER_BY_OWNER to selectively
sanitize modules. By default, both are being sanitized. The
value of the variable is interpreted as a space or colon
separated list of owner names.

This can be used to create builds that lower the sanitization
burden by not sanitizing parts of the platform.

Bug: 29498013
Change-Id: Ib4412657fd38ff28a5c0863eddc2acde63c88ebb
(cherry picked from commit ea38d8e95d)

core/config_sanitizers.mk

@@ -30,6 +30,17 @@ ifeq ($(filter $(SANITIZE_ARCH),$(my_32_64_bit_suffix)),)
   my_sanitize :=
 endif
 
+# Add a filter point based on module owner (to lighten the burden). The format is a space- or
+# colon-separated list of owner names.
+ifneq (,$(SANITIZE_NEVER_BY_OWNER))
+  ifneq (,$(LOCAL_MODULE_OWNER))
+    ifneq (,$(filter $(LOCAL_MODULE_OWNER),$(subst :, ,$(SANITIZE_NEVER_BY_OWNER))))
+      $(warning Not sanitizing $(LOCAL_MODULE) based on module owner.)
+      my_sanitize :=
+    endif
+  endif
+endif
+
 # Don't apply sanitizers to NDK code.
 ifdef LOCAL_SDK_VERSION
   my_sanitize :=