[libfuzzer] Add 'vptr' flag to builds with UndefinedBehaviourSanitizer.

build/config/sanitizers/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
 
 # Contains the dependencies needed for sanitizers to link into executables and
@@ skipping 334 matching lines @@
 }
 
 config("ubsan_no_recover") {
   if (is_ubsan_no_recover) {
     cflags = [ "-fno-sanitize-recover=undefined" ]
   }
 }
 
 config("ubsan_security_flags") {
   if (is_ubsan_security) {
-    ubsan_blacklist_path =
-        rebase_path("//tools/ubsan/blacklist.txt", root_build_dir)
+    ubsan_security_blacklist_path =
+        rebase_path("//tools/ubsan/security_blacklist.txt", root_build_dir)
     cflags = [
-      "-fsanitize=signed-integer-overflow,shift",
-      "-fsanitize-blacklist=$ubsan_blacklist_path",
+      "-fsanitize=signed-integer-overflow,shift,vptr",
+      "-fsanitize-blacklist=$ubsan_security_blacklist_path",
     ]
   }
 }
 
 config("ubsan_vptr_flags") {
   if (is_ubsan_vptr) {
     ubsan_vptr_blacklist_path =
         rebase_path("//tools/ubsan/vptr_blacklist.txt", root_build_dir)
     cflags = [
       "-fsanitize=vptr",
@@ skipping 33 matching lines @@
 # This allows to selectively disable ubsan_vptr, when needed. In particular,
 # if some third_party code is required to be compiled without rtti, which
 # is a requirement for ubsan_vptr.
 config("default_sanitizer_flags_but_ubsan_vptr") {
   configs = all_sanitizer_configs - [ ":ubsan_vptr_flags" ]
 }
 
 config("default_sanitizer_flags_but_coverage") {
   configs = all_sanitizer_configs - [ ":coverage_flags" ]
 }