Repository: nodejs/node
Pull request: src: fix crash when lazy getter is invoked in a vm context

V8 should invoke native functions in their creation context,
preventing dynamic context by the caller. However, the lazy getter has
no JavaScript function representation and has no creation context. It
is not invoked in the original creation context. Fix the null realm by
retrieving the creation context via `this` argument.

Fixes https://github.com/nodejs/node/issues/57166

Changed files:
filename: src/node_errors.h
patch: @@ -84,6 +84,7 @@ void OOMErrorHandler(const char* location, const v8::OOMDetails& details);
   V(ERR_INVALID_ARG_TYPE, TypeError)                                           \
   V(ERR_INVALID_FILE_URL_HOST, TypeError)                                      \
   V(ERR_INVALID_FILE_URL_PATH, TypeError)                                      \
+  V(ERR_INVALID_INVOCATION, TypeError)                                         \
   V(ERR_INVALID_PACKAGE_CONFIG, Error)                                         \
   V(ERR_INVALID_OBJECT_DEFINE_PROPERTY, TypeError)                             \
   V(ERR_INVALID_MODULE, Error)                                                 \
@@ -201,6 +202,7 @@ ERRORS_WITH_CODE(V)
     "Context not associated with Node.js environment")                         \
   V(ERR_ILLEGAL_CONSTRUCTOR, "Illegal constructor")                            \
   V(ERR_INVALID_ADDRESS, "Invalid socket address")                             \
+  V(ERR_INVALID_INVOCATION, "Invalid invocation")                              \
   V(ERR_INVALID_MODULE, "No such module")                                      \
   V(ERR_INVALID_STATE, "Invalid state")                                        \
   V(ERR_INVALID_THIS, "Value of \"this\" is the wrong type")                   \

filename: src/node_util.cc
patch: @@ -350,9 +350,25 @@ static void IsInsideNodeModules(const FunctionCallbackInfo<Value>& args) {
 
 static void DefineLazyPropertiesGetter(
     Local<v8::Name> name, const v8::PropertyCallbackInfo<Value>& info) {
-  Realm* realm = Realm::GetCurrent(info);
-  Isolate* isolate = realm->isolate();
-  auto context = isolate->GetCurrentContext();
+  Isolate* isolate = info.GetIsolate();
+  // This getter has no JavaScript function representation and is not
+  // invoked in the creation context.
+  // When this getter is invoked in a vm context, the `Realm::GetCurrent(info)`
+  // returns a nullptr and. Retrieve the creation context via `this` object and
+  // get the creation Realm.
+  Local<Value> receiver_val = info.This();
+  if (!receiver_val->IsObject()) {
+    THROW_ERR_INVALID_INVOCATION(isolate);
+    return;
+  }
+  Local<Object> receiver = receiver_val.As<Object>();
+  Local<Context> context;
+  if (!receiver->GetCreationContext().ToLocal(&context)) {
+    THROW_ERR_INVALID_INVOCATION(isolate);
+    return;
+  }
+
+  Realm* realm = Realm::GetCurrent(context);
   Local<Value> arg = info.Data();
   Local<Value> require_result;
   if (!realm->builtin_module_require()
@@ -368,6 +384,7 @@ static void DefineLazyPropertiesGetter(
   }
   info.GetReturnValue().Set(ret);
 }
+
 static void DefineLazyProperties(const FunctionCallbackInfo<Value>& args) {
   // target: object, id: string, keys: string[][, enumerable = true]
   CHECK_GE(args.Length(), 3);

filename: test/parallel/test-vm-util-lazy-properties.js
patch: @@ -0,0 +1,26 @@
+'use strict';
+require('../common');
+
+const vm = require('node:vm');
+const util = require('node:util');
+const assert = require('node:assert');
+
+// This verifies that invoking property getters defined with
+// `require('internal/util').defineLazyProperties` does not crash
+// the process.
+
+const ctx = vm.createContext();
+const getter = vm.runInContext(`
+  function getter(object, property) {
+    return object[property];
+  }
+  getter;
+`, ctx);
+
+// `util.parseArgs` is a lazy property.
+const parseArgs = getter(util, 'parseArgs');
+assert.strictEqual(parseArgs, util.parseArgs);
+
+// `globalThis.TextEncoder` is a lazy property.
+const TextEncoder = getter(globalThis, 'TextEncoder');
+assert.strictEqual(TextEncoder, globalThis.TextEncoder);