filter out .caller from other worlds

src/accessors.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 #include "accessors.h"
 
 #include "compiler.h"
 #include "contexts.h"
 #include "deoptimizer.h"
@@ skipping 1106 matching lines @@
                       &FunctionArgumentsSetter,
                       attributes);
 }
 
 
 //
 // Accessors::FunctionCaller
 //
 
 
+static inline bool AllowAccessToFunction(Context* current_context,
+                                         JSFunction* function) {
+  return current_context->HasSameSecurityTokenAs(function->context());
+}
+
+
 class FrameFunctionIterator {
  public:
   FrameFunctionIterator(Isolate* isolate, const DisallowHeapAllocation& promise)
-      : frame_iterator_(isolate),
+      : isolate_(isolate),
+        frame_iterator_(isolate),
         functions_(2),
         index_(0) {
     GetFunctions();
   }
   JSFunction* next() {
     if (functions_.length() == 0) return NULL;
-    JSFunction* next_function = functions_[index_];
-    index_--;
-    if (index_ < 0) {
-      GetFunctions();
+    while (true) {
+      JSFunction* next_function = functions_[index_];
+      index_--;
+      if (index_ < 0) {
+        GetFunctions();
+      }
+      // Skip functions from other origins.
+      if (!AllowAccessToFunction(isolate_->context(), next_function)) continue;
+      return next_function;
     }
-    return next_function;
   }
 
   // Iterate through functions until the first occurence of 'function'.
   // Returns true if 'function' is found, and false if the iterator ends
   // without finding it.
   bool Find(JSFunction* function) {
     JSFunction* next_function;
     do {
       next_function = next();
       if (next_function == function) return true;
     } while (next_function != NULL);
     return false;
   }
 
  private:
   void GetFunctions() {
     functions_.Rewind(0);
     if (frame_iterator_.done()) return;
     JavaScriptFrame* frame = frame_iterator_.frame();
     frame->GetFunctions(&functions_);
     ASSERT(functions_.length() > 0);
     frame_iterator_.Advance();
     index_ = functions_.length() - 1;
   }
+  Isolate* isolate_;
   JavaScriptFrameIterator frame_iterator_;
   List<JSFunction*> functions_;
   int index_;
 };
 
 
 MaybeHandle<JSFunction> FindCaller(Isolate* isolate,
                                    Handle<JSFunction> function) {
   DisallowHeapAllocation no_allocation;
   FrameFunctionIterator it(isolate, no_allocation);
@@ skipping 27 matching lines @@
   // and its associated throwing caller and arguments.
   if (caller->shared()->bound()) {
     return MaybeHandle<JSFunction>();
   }
   // Censor if the caller is not a sloppy mode function.
   // Change from ES5, which used to throw, see:
   // https://bugs.ecmascript.org/show_bug.cgi?id=310
   if (caller->shared()->strict_mode() == STRICT) {
     return MaybeHandle<JSFunction>();
   }
+  // Don't return caller from another security context.
+  if (!AllowAccessToFunction(isolate->context(), caller)) {
+    return MaybeHandle<JSFunction>();
+  }
   return Handle<JSFunction>(caller);
 }
 
 
 void Accessors::FunctionCallerGetter(
     v8::Local<v8::String> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
   HandleScope scope(isolate);
   Handle<Object> object = GetThisFrom(info);
@@ skipping 98 matching lines @@
   info->set_data(Smi::FromInt(index));
   Handle<Object> getter = v8::FromCData(isolate, &ModuleGetExport);
   Handle<Object> setter = v8::FromCData(isolate, &ModuleSetExport);
   info->set_getter(*getter);
   if (!(attributes & ReadOnly)) info->set_setter(*setter);
   return info;
 }
 
 
 } }  // namespace v8::internal