src: protect global state with mutexes

Original PR: ayojs/ayo#82
> PR-URL: ayojs/ayo#82
> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>

Author: addaleax

node.gyp

@@ -223,7 +223,6 @@
         'src/signal_wrap.cc',
         'src/spawn_sync.cc',
         'src/string_bytes.cc',
-        'src/string_search.cc',
         'src/stream_base.cc',
         'src/stream_wrap.cc',
         'src/tcp_wrap.cc',
@@ -685,7 +684,6 @@
             '<(OBJ_PATH)<(OBJ_SEPARATOR)node_url.<(OBJ_SUFFIX)',
             '<(OBJ_PATH)<(OBJ_SEPARATOR)util.<(OBJ_SUFFIX)',
             '<(OBJ_PATH)<(OBJ_SEPARATOR)string_bytes.<(OBJ_SUFFIX)',
-            '<(OBJ_PATH)<(OBJ_SEPARATOR)string_search.<(OBJ_SUFFIX)',
             '<(OBJ_PATH)<(OBJ_SEPARATOR)stream_base.<(OBJ_SUFFIX)',
             '<(OBJ_PATH)<(OBJ_SEPARATOR)node_constants.<(OBJ_SUFFIX)',
             '<(OBJ_TRACING_PATH)<(OBJ_SEPARATOR)agent.<(OBJ_SUFFIX)',

src/node.cc

@@ -167,6 +167,9 @@ using v8::Value;
 
 using AsyncHooks = node::Environment::AsyncHooks;
 
+static Mutex process_mutex;
+static Mutex environ_mutex;
+
 static bool print_eval = false;
 static bool force_repl = false;
 static bool syntax_check_only = false;
@@ -1789,6 +1792,7 @@ void AppendExceptionLine(Environment* env,
   if (!can_set_arrow || (mode == FATAL_ERROR && !err_obj->IsNativeError())) {
     if (env->printed_error())
       return;
+    Mutex::ScopedLock lock(process_mutex);
     env->set_printed_error(true);
 
     uv_tty_reset_mode();
@@ -2952,6 +2956,7 @@ static void LinkedBinding(const FunctionCallbackInfo<Value>& args) {
 
 static void ProcessTitleGetter(Local<Name> property,
                                const PropertyCallbackInfo<Value>& info) {
+  Mutex::ScopedLock lock(process_mutex);
   char buffer[512];
   uv_get_process_title(buffer, sizeof(buffer));
   info.GetReturnValue().Set(String::NewFromUtf8(info.GetIsolate(), buffer));
@@ -2961,6 +2966,7 @@ static void ProcessTitleGetter(Local<Name> property,
 static void ProcessTitleSetter(Local<Name> property,
                                Local<Value> value,
                                const PropertyCallbackInfo<void>& info) {
+  Mutex::ScopedLock lock(process_mutex);
   node::Utf8Value title(info.GetIsolate(), value);
   // TODO(piscisaureus): protect with a lock
   uv_set_process_title(*title);
@@ -2969,6 +2975,7 @@ static void ProcessTitleSetter(Local<Name> property,
 
 static void EnvGetter(Local<Name> property,
                       const PropertyCallbackInfo<Value>& info) {
+  Mutex::ScopedLock lock(environ_mutex);
   Isolate* isolate = info.GetIsolate();
   if (property->IsSymbol()) {
     return info.GetReturnValue().SetUndefined();
@@ -3001,6 +3008,7 @@ static void EnvGetter(Local<Name> property,
 static void EnvSetter(Local<Name> property,
                       Local<Value> value,
                       const PropertyCallbackInfo<Value>& info) {
+  Mutex::ScopedLock lock(environ_mutex);
 #ifdef __POSIX__
   node::Utf8Value key(info.GetIsolate(), property);
   node::Utf8Value val(info.GetIsolate(), value);
@@ -3021,6 +3029,7 @@ static void EnvSetter(Local<Name> property,
 
 static void EnvQuery(Local<Name> property,
                      const PropertyCallbackInfo<Integer>& info) {
+  Mutex::ScopedLock lock(environ_mutex);
   int32_t rc = -1;  // Not found unless proven otherwise.
   if (property->IsString()) {
 #ifdef __POSIX__
@@ -3049,6 +3058,7 @@ static void EnvQuery(Local<Name> property,
 
 static void EnvDeleter(Local<Name> property,
                        const PropertyCallbackInfo<Boolean>& info) {
+  Mutex::ScopedLock lock(environ_mutex);
   if (property->IsString()) {
 #ifdef __POSIX__
     node::Utf8Value key(info.GetIsolate(), property);
@@ -3067,6 +3077,7 @@ static void EnvDeleter(Local<Name> property,
 
 
 static void EnvEnumerator(const PropertyCallbackInfo<Array>& info) {
+  Mutex::ScopedLock lock(environ_mutex);
   Environment* env = Environment::GetCurrent(info);
   Isolate* isolate = env->isolate();
   Local<Context> ctx = env->context();
@@ -3190,6 +3201,7 @@ static Local<Object> GetFeatures(Environment* env) {
 
 static void DebugPortGetter(Local<Name> property,
                             const PropertyCallbackInfo<Value>& info) {
+  Mutex::ScopedLock lock(process_mutex);
   int port = debug_options.port();
 #if HAVE_INSPECTOR
   if (port == 0) {
@@ -3205,6 +3217,7 @@ static void DebugPortGetter(Local<Name> property,
 static void DebugPortSetter(Local<Name> property,
                             Local<Value> value,
                             const PropertyCallbackInfo<void>& info) {
+  Mutex::ScopedLock lock(process_mutex);
   debug_options.set_port(value->Int32Value());
 }
 

src/node_crypto.cc

@@ -788,6 +788,9 @@ static int X509_up_ref(X509* cert) {
 
 static X509_STORE* NewRootCertStore() {
   static std::vector<X509*> root_certs_vector;
+  static Mutex root_certs_vector_mutex;
+  Mutex::ScopedLock lock(root_certs_vector_mutex);
+
   if (root_certs_vector.empty()) {
     for (size_t i = 0; i < arraysize(root_certs); i++) {
       BIO* bp = NodeBIO::NewFixed(root_certs[i], strlen(root_certs[i]));

src/node_http2.cc

@@ -28,7 +28,7 @@ Freelist<nghttp2_header_list, FREELIST_MAX> header_free_list;
 Freelist<nghttp2_data_chunks_t, FREELIST_MAX>
     data_chunks_free_list;
 
-Nghttp2Session::Callbacks Nghttp2Session::callback_struct_saved[2] = {
+const Nghttp2Session::Callbacks Nghttp2Session::callback_struct_saved[2] = {
     Callbacks(false),
     Callbacks(true)};
 

src/node_http2_core.h

@@ -279,7 +279,7 @@ class Nghttp2Session {
   };
 
   /* Use callback_struct_saved[kHasGetPaddingCallback ? 1 : 0] */
-  static Callbacks callback_struct_saved[2];
+  static const Callbacks callback_struct_saved[2];
 
   nghttp2_session* session_;
   uv_loop_t* loop_;

src/string_search.cc

@@ -85,12 +85,12 @@ class StringSearchBase {
   static const int kBMMinPatternLength = 8;
 
   // Store for the BoyerMoore(Horspool) bad char shift table.
-  static int kBadCharShiftTable[kUC16AlphabetSize];
+  int kBadCharShiftTable[kUC16AlphabetSize];
   // Store for the BoyerMoore good suffix shift table.
-  static int kGoodSuffixShiftTable[kBMMaxShift + 1];
+  int kGoodSuffixShiftTable[kBMMaxShift + 1];
   // Table used temporarily while building the BoyerMoore good suffix
   // shift table.
-  static int kSuffixTable[kBMMaxShift + 1];
+  int kSuffixTable[kBMMaxShift + 1];
 };
 
 template <typename Char>