[inspector][fuzzer] Add inspector fuzzer

This adds a first simple version of the inspector fuzzer, which is a
stripped-down version of the inspector-test executable. The fuzzer
generates inputs which are compatible with inspector-test.

There are still memory leaks, and the fuzzer will probably run into
timeouts most of the time. Both of this will be addressed in follow-ups.

R=szuend@chromium.org, machenbach@chromium.org

Bug: chromium:1142437
Change-Id: I4d13da460f571d791a3642b0705a1f07b442c11b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2505722
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70922}

BUILD.gn

@@ -4806,6 +4806,7 @@ if (is_fuchsia && !build_with_chromium) {
 group("v8_fuzzers") {
   testonly = true
   data_deps = [
+    ":v8_simple_inspector_fuzzer",
     ":v8_simple_json_fuzzer",
     ":v8_simple_multi_return_fuzzer",
     ":v8_simple_parser_fuzzer",
@@ -5270,6 +5271,23 @@ v8_source_set("wasm_compile_fuzzer") {
 v8_fuzzer("wasm_compile_fuzzer") {
 }
 
+v8_source_set("inspector_fuzzer") {
+  sources = [ "test/fuzzer/inspector-fuzzer.cc" ]
+
+  deps = [
+    ":fuzzer_support",
+    "test/inspector:inspector_test",
+  ]
+
+  configs = [
+    ":external_config",
+    ":internal_config_base",
+  ]
+}
+
+v8_fuzzer("inspector_fuzzer") {
+}
+
 # Target to build all generated .cc files.
 group("v8_generated_cc_files") {
   testonly = true

test/fuzzer/BUILD.gn

@@ -6,13 +6,14 @@ group("v8_fuzzer") {
   testonly = true
 
   data_deps = [
-    "../../tools:v8_testrunner",
     "../..:v8_fuzzers",
+    "../../tools:v8_testrunner",
   ]
 
   data = [
     "./fuzzer.status",
     "./testcfg.py",
+    "./inspector/",
     "./json/",
     "./parser/",
     "./regexp/",

test/fuzzer/inspector-fuzzer.cc

@@ -0,0 +1,595 @@
+// Copyright 2020 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.
+
+#if !defined(_WIN32) && !defined(_WIN64)
+#include <unistd.h>  // NOLINT
+#endif               // !defined(_WIN32) && !defined(_WIN64)
+
+#include <locale.h>
+
+#include <string>
+#include <vector>
+
+#include "include/libplatform/libplatform.h"
+#include "include/v8.h"
+#include "src/base/platform/platform.h"
+#include "src/flags/flags.h"
+#include "src/heap/read-only-heap.h"
+#include "src/libplatform/default-platform.h"
+#include "src/utils/utils.h"
+#include "src/utils/vector.h"
+#include "test/inspector/frontend-channel.h"
+#include "test/inspector/isolate-data.h"
+#include "test/inspector/task-runner.h"
+#include "test/inspector/tasks.h"
+
+namespace v8 {
+namespace internal {
+namespace {
+
+std::vector<TaskRunner*> task_runners;
+
+void Terminate() {
+  for (TaskRunner* r : task_runners) {
+    r->Terminate();
+    r->Join();
+  }
+  task_runners.clear();
+}
+
+class UtilsExtension : public IsolateData::SetupGlobalTask {
+ public:
+  ~UtilsExtension() override = default;
+  void Run(v8::Isolate* isolate,
+           v8::Local<v8::ObjectTemplate> global) override {
+    v8::Local<v8::ObjectTemplate> utils = v8::ObjectTemplate::New(isolate);
+    auto Set = [isolate](v8::Local<v8::ObjectTemplate> tmpl, const char* str,
+                         v8::Local<v8::Data> value) {
+      tmpl->Set(ToV8String(isolate, str), value,
+                static_cast<v8::PropertyAttribute>(
+                    v8::PropertyAttribute::ReadOnly |
+                    v8::PropertyAttribute::DontDelete));
+    };
+    Set(utils, "quit",
+        v8::FunctionTemplate::New(isolate, &UtilsExtension::Quit));
+    Set(utils, "compileAndRunWithOrigin",
+        v8::FunctionTemplate::New(isolate,
+                                  &UtilsExtension::CompileAndRunWithOrigin));
+    Set(utils, "schedulePauseOnNextStatement",
+        v8::FunctionTemplate::New(
+            isolate, &UtilsExtension::SchedulePauseOnNextStatement));
+    Set(utils, "cancelPauseOnNextStatement",
+        v8::FunctionTemplate::New(isolate,
+                                  &UtilsExtension::CancelPauseOnNextStatement));
+    Set(utils, "createContextGroup",
+        v8::FunctionTemplate::New(isolate,
+                                  &UtilsExtension::CreateContextGroup));
+    Set(utils, "resetContextGroup",
+        v8::FunctionTemplate::New(isolate, &UtilsExtension::ResetContextGroup));
+    Set(utils, "connectSession",
+        v8::FunctionTemplate::New(isolate, &UtilsExtension::ConnectSession));
+    Set(utils, "disconnectSession",
+        v8::FunctionTemplate::New(isolate, &UtilsExtension::DisconnectSession));
+    Set(utils, "sendMessageToBackend",
+        v8::FunctionTemplate::New(isolate,
+                                  &UtilsExtension::SendMessageToBackend));
+    Set(global, "utils", utils);
+  }
+
+  static void set_backend_task_runner(TaskRunner* runner) {
+    backend_runner_ = runner;
+  }
+
+  static void ClearAllSessions() { channels_.clear(); }
+
+ private:
+  static TaskRunner* backend_runner_;
+
+  static void Quit(const v8::FunctionCallbackInfo<v8::Value>& args) {
+    Terminate();
+  }
+
+  static void CompileAndRunWithOrigin(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 5 || !args[0]->IsInt32() || !args[1]->IsString() ||
+        !args[2]->IsString() || !args[3]->IsInt32() || !args[4]->IsInt32()) {
+      return;
+    }
+
+    backend_runner_->Append(new ExecuteStringTask(
+        args.GetIsolate(), args[0].As<v8::Int32>()->Value(),
+        ToVector(args.GetIsolate(), args[1].As<v8::String>()),
+        args[2].As<v8::String>(), args[3].As<v8::Int32>(),
+        args[4].As<v8::Int32>(), v8::Boolean::New(args.GetIsolate(), false)));
+  }
+
+  static void SchedulePauseOnNextStatement(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 3 || !args[0]->IsInt32() || !args[1]->IsString() ||
+        !args[2]->IsString()) {
+      return;
+    }
+    std::vector<uint16_t> reason =
+        ToVector(args.GetIsolate(), args[1].As<v8::String>());
+    std::vector<uint16_t> details =
+        ToVector(args.GetIsolate(), args[2].As<v8::String>());
+    int context_group_id = args[0].As<v8::Int32>()->Value();
+    RunSyncTask(backend_runner_,
+                [&context_group_id, &reason, &details](IsolateData* data) {
+                  data->SchedulePauseOnNextStatement(
+                      context_group_id,
+                      v8_inspector::StringView(reason.data(), reason.size()),
+                      v8_inspector::StringView(details.data(), details.size()));
+                });
+  }
+
+  static void CancelPauseOnNextStatement(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsInt32()) {
+      return;
+    }
+    int context_group_id = args[0].As<v8::Int32>()->Value();
+    RunSyncTask(backend_runner_, [&context_group_id](IsolateData* data) {
+      data->CancelPauseOnNextStatement(context_group_id);
+    });
+  }
+
+  static void CreateContextGroup(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 0) {
+      return;
+    }
+    int context_group_id = 0;
+    RunSyncTask(backend_runner_, [&context_group_id](IsolateData* data) {
+      context_group_id = data->CreateContextGroup();
+    });
+    args.GetReturnValue().Set(
+        v8::Int32::New(args.GetIsolate(), context_group_id));
+  }
+
+  static void ResetContextGroup(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsInt32()) {
+      return;
+    }
+    int context_group_id = args[0].As<v8::Int32>()->Value();
+    RunSyncTask(backend_runner_, [&context_group_id](IsolateData* data) {
+      data->ResetContextGroup(context_group_id);
+    });
+  }
+
+  static void ConnectSession(const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 3 || !args[0]->IsInt32() || !args[1]->IsString() ||
+        !args[2]->IsFunction()) {
+      return;
+    }
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    FrontendChannelImpl* channel = new FrontendChannelImpl(
+        IsolateData::FromContext(context)->task_runner(),
+        IsolateData::FromContext(context)->GetContextGroupId(context),
+        args.GetIsolate(), args[2].As<v8::Function>());
+
+    std::vector<uint8_t> state =
+        ToBytes(args.GetIsolate(), args[1].As<v8::String>());
+    int context_group_id = args[0].As<v8::Int32>()->Value();
+    int session_id = 0;
+    RunSyncTask(backend_runner_, [&context_group_id, &session_id, &channel,
+                                  &state](IsolateData* data) {
+      session_id = data->ConnectSession(
+          context_group_id,
+          v8_inspector::StringView(state.data(), state.size()), channel);
+      channel->set_session_id(session_id);
+    });
+
+    channels_[session_id].reset(channel);
+    args.GetReturnValue().Set(v8::Int32::New(args.GetIsolate(), session_id));
+  }
+
+  static void DisconnectSession(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsInt32()) {
+      return;
+    }
+    int session_id = args[0].As<v8::Int32>()->Value();
+    std::vector<uint8_t> state;
+    RunSyncTask(backend_runner_, [&session_id, &state](IsolateData* data) {
+      state = data->DisconnectSession(session_id);
+    });
+    channels_.erase(session_id);
+    args.GetReturnValue().Set(ToV8String(args.GetIsolate(), state));
+  }
+
+  static void SendMessageToBackend(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 2 || !args[0]->IsInt32() || !args[1]->IsString()) {
+      return;
+    }
+    backend_runner_->Append(new SendMessageToBackendTask(
+        args[0].As<v8::Int32>()->Value(),
+        ToVector(args.GetIsolate(), args[1].As<v8::String>())));
+  }
+
+  static std::map<int, std::unique_ptr<FrontendChannelImpl>> channels_;
+};
+
+TaskRunner* UtilsExtension::backend_runner_ = nullptr;
+std::map<int, std::unique_ptr<FrontendChannelImpl>> UtilsExtension::channels_;
+
+bool StrictAccessCheck(v8::Local<v8::Context> accessing_context,
+                       v8::Local<v8::Object> accessed_object,
+                       v8::Local<v8::Value> data) {
+  CHECK(accessing_context.IsEmpty());
+  return accessing_context.IsEmpty();
+}
+
+class InspectorExtension : public IsolateData::SetupGlobalTask {
+ public:
+  ~InspectorExtension() override = default;
+  void Run(v8::Isolate* isolate,
+           v8::Local<v8::ObjectTemplate> global) override {
+    v8::Local<v8::ObjectTemplate> inspector = v8::ObjectTemplate::New(isolate);
+    inspector->Set(ToV8String(isolate, "fireContextCreated"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::FireContextCreated));
+    inspector->Set(ToV8String(isolate, "fireContextDestroyed"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::FireContextDestroyed));
+    inspector->Set(
+        ToV8String(isolate, "freeContext"),
+        v8::FunctionTemplate::New(isolate, &InspectorExtension::FreeContext));
+    inspector->Set(ToV8String(isolate, "addInspectedObject"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::AddInspectedObject));
+    inspector->Set(ToV8String(isolate, "setMaxAsyncTaskStacks"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::SetMaxAsyncTaskStacks));
+    inspector->Set(
+        ToV8String(isolate, "dumpAsyncTaskStacksStateForTest"),
+        v8::FunctionTemplate::New(
+            isolate, &InspectorExtension::DumpAsyncTaskStacksStateForTest));
+    inspector->Set(
+        ToV8String(isolate, "breakProgram"),
+        v8::FunctionTemplate::New(isolate, &InspectorExtension::BreakProgram));
+    inspector->Set(
+        ToV8String(isolate, "createObjectWithStrictCheck"),
+        v8::FunctionTemplate::New(
+            isolate, &InspectorExtension::CreateObjectWithStrictCheck));
+    inspector->Set(ToV8String(isolate, "callWithScheduledBreak"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::CallWithScheduledBreak));
+    inspector->Set(ToV8String(isolate, "allowAccessorFormatting"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::AllowAccessorFormatting));
+    inspector->Set(
+        ToV8String(isolate, "markObjectAsNotInspectable"),
+        v8::FunctionTemplate::New(
+            isolate, &InspectorExtension::MarkObjectAsNotInspectable));
+    inspector->Set(ToV8String(isolate, "createObjectWithAccessor"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::CreateObjectWithAccessor));
+    inspector->Set(ToV8String(isolate, "storeCurrentStackTrace"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::StoreCurrentStackTrace));
+    inspector->Set(ToV8String(isolate, "externalAsyncTaskStarted"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::ExternalAsyncTaskStarted));
+    inspector->Set(
+        ToV8String(isolate, "externalAsyncTaskFinished"),
+        v8::FunctionTemplate::New(
+            isolate, &InspectorExtension::ExternalAsyncTaskFinished));
+    inspector->Set(ToV8String(isolate, "scheduleWithAsyncStack"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::ScheduleWithAsyncStack));
+    inspector->Set(
+        ToV8String(isolate, "setAllowCodeGenerationFromStrings"),
+        v8::FunctionTemplate::New(
+            isolate, &InspectorExtension::SetAllowCodeGenerationFromStrings));
+    inspector->Set(ToV8String(isolate, "setResourceNamePrefix"),
+                   v8::FunctionTemplate::New(
+                       isolate, &InspectorExtension::SetResourceNamePrefix));
+    global->Set(ToV8String(isolate, "inspector"), inspector);
+  }
+
+ private:
+  static void FireContextCreated(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    data->FireContextCreated(context, data->GetContextGroupId(context),
+                             v8_inspector::StringView());
+  }
+
+  static void FireContextDestroyed(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    data->FireContextDestroyed(context);
+  }
+
+  static void FreeContext(const v8::FunctionCallbackInfo<v8::Value>& args) {
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    data->FreeContext(context);
+  }
+
+  static void AddInspectedObject(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 2 || !args[0]->IsInt32()) {
+      return;
+    }
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    data->AddInspectedObject(args[0].As<v8::Int32>()->Value(), args[1]);
+  }
+
+  static void SetMaxAsyncTaskStacks(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsInt32()) {
+      return;
+    }
+    IsolateData::FromContext(args.GetIsolate()->GetCurrentContext())
+        ->SetMaxAsyncTaskStacksForTest(args[0].As<v8::Int32>()->Value());
+  }
+
+  static void DumpAsyncTaskStacksStateForTest(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 0) {
+      return;
+    }
+    IsolateData::FromContext(args.GetIsolate()->GetCurrentContext())
+        ->DumpAsyncTaskStacksStateForTest();
+  }
+
+  static void BreakProgram(const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 2 || !args[0]->IsString() || !args[1]->IsString()) {
+      return;
+    }
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    std::vector<uint16_t> reason =
+        ToVector(args.GetIsolate(), args[0].As<v8::String>());
+    v8_inspector::StringView reason_view(reason.data(), reason.size());
+    std::vector<uint16_t> details =
+        ToVector(args.GetIsolate(), args[1].As<v8::String>());
+    v8_inspector::StringView details_view(details.data(), details.size());
+    data->BreakProgram(data->GetContextGroupId(context), reason_view,
+                       details_view);
+  }
+
+  static void CreateObjectWithStrictCheck(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 0) {
+      return;
+    }
+    v8::Local<v8::ObjectTemplate> templ =
+        v8::ObjectTemplate::New(args.GetIsolate());
+    templ->SetAccessCheckCallback(&StrictAccessCheck);
+    args.GetReturnValue().Set(
+        templ->NewInstance(args.GetIsolate()->GetCurrentContext())
+            .ToLocalChecked());
+  }
+
+  static void CallWithScheduledBreak(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 3 || !args[0]->IsFunction() || !args[1]->IsString() ||
+        !args[2]->IsString()) {
+      return;
+    }
+    std::vector<uint16_t> reason =
+        ToVector(args.GetIsolate(), args[1].As<v8::String>());
+    v8_inspector::StringView reason_view(reason.data(), reason.size());
+    std::vector<uint16_t> details =
+        ToVector(args.GetIsolate(), args[2].As<v8::String>());
+    v8_inspector::StringView details_view(details.data(), details.size());
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    int context_group_id = data->GetContextGroupId(context);
+    data->SchedulePauseOnNextStatement(context_group_id, reason_view,
+                                       details_view);
+    v8::MaybeLocal<v8::Value> result;
+    result = args[0].As<v8::Function>()->Call(context, context->Global(), 0,
+                                              nullptr);
+    data->CancelPauseOnNextStatement(context_group_id);
+  }
+
+  static void AllowAccessorFormatting(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsObject()) {
+      return;
+    }
+    v8::Local<v8::Object> object = args[0].As<v8::Object>();
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Private> shouldFormatAccessorsPrivate = v8::Private::ForApi(
+        isolate, ToV8String(isolate, "allowAccessorFormatting"));
+    object
+        ->SetPrivate(isolate->GetCurrentContext(), shouldFormatAccessorsPrivate,
+                     v8::Null(isolate))
+        .ToChecked();
+  }
+
+  static void MarkObjectAsNotInspectable(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsObject()) {
+      return;
+    }
+    v8::Local<v8::Object> object = args[0].As<v8::Object>();
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Private> notInspectablePrivate =
+        v8::Private::ForApi(isolate, ToV8String(isolate, "notInspectable"));
+    object
+        ->SetPrivate(isolate->GetCurrentContext(), notInspectablePrivate,
+                     v8::True(isolate))
+        .ToChecked();
+  }
+
+  static void CreateObjectWithAccessor(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 2 || !args[0]->IsString() || !args[1]->IsBoolean()) {
+      return;
+    }
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::ObjectTemplate> templ = v8::ObjectTemplate::New(isolate);
+    if (args[1].As<v8::Boolean>()->Value()) {
+      templ->SetAccessor(v8::Local<v8::String>::Cast(args[0]), AccessorGetter,
+                         AccessorSetter);
+    } else {
+      templ->SetAccessor(v8::Local<v8::String>::Cast(args[0]), AccessorGetter);
+    }
+    args.GetReturnValue().Set(
+        templ->NewInstance(isolate->GetCurrentContext()).ToLocalChecked());
+  }
+
+  static void AccessorGetter(v8::Local<v8::String> property,
+                             const v8::PropertyCallbackInfo<v8::Value>& info) {
+    v8::Isolate* isolate = info.GetIsolate();
+    isolate->ThrowException(ToV8String(isolate, "Getter is called"));
+  }
+
+  static void AccessorSetter(v8::Local<v8::String> property,
+                             v8::Local<v8::Value> value,
+                             const v8::PropertyCallbackInfo<void>& info) {
+    v8::Isolate* isolate = info.GetIsolate();
+    isolate->ThrowException(ToV8String(isolate, "Setter is called"));
+  }
+
+  static void StoreCurrentStackTrace(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsString()) {
+      return;
+    }
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    std::vector<uint16_t> description =
+        ToVector(isolate, args[0].As<v8::String>());
+    v8_inspector::StringView description_view(description.data(),
+                                              description.size());
+    v8_inspector::V8StackTraceId id =
+        data->StoreCurrentStackTrace(description_view);
+    v8::Local<v8::ArrayBuffer> buffer =
+        v8::ArrayBuffer::New(isolate, sizeof(id));
+    *static_cast<v8_inspector::V8StackTraceId*>(
+        buffer->GetBackingStore()->Data()) = id;
+    args.GetReturnValue().Set(buffer);
+  }
+
+  static void ExternalAsyncTaskStarted(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsArrayBuffer()) {
+      return;
+    }
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    v8_inspector::V8StackTraceId* id =
+        static_cast<v8_inspector::V8StackTraceId*>(
+            args[0].As<v8::ArrayBuffer>()->GetBackingStore()->Data());
+    data->ExternalAsyncTaskStarted(*id);
+  }
+
+  static void ExternalAsyncTaskFinished(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsArrayBuffer()) {
+      return;
+    }
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    v8_inspector::V8StackTraceId* id =
+        static_cast<v8_inspector::V8StackTraceId*>(
+            args[0].As<v8::ArrayBuffer>()->GetBackingStore()->Data());
+    data->ExternalAsyncTaskFinished(*id);
+  }
+
+  static void ScheduleWithAsyncStack(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 3 || !args[0]->IsFunction() || !args[1]->IsString() ||
+        !args[2]->IsBoolean()) {
+      return;
+    }
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    int context_group_id = data->GetContextGroupId(context);
+    bool with_empty_stack = args[2].As<v8::Boolean>()->Value();
+    if (with_empty_stack) context->Exit();
+
+    std::vector<uint16_t> task_name =
+        ToVector(isolate, args[1].As<v8::String>());
+    v8_inspector::StringView task_name_view(task_name.data(), task_name.size());
+
+    RunAsyncTask(data->task_runner(), task_name_view,
+                 new SetTimeoutTask(context_group_id, isolate,
+                                    v8::Local<v8::Function>::Cast(args[0])));
+    if (with_empty_stack) context->Enter();
+  }
+
+  static void SetAllowCodeGenerationFromStrings(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsBoolean()) {
+      return;
+    }
+    args.GetIsolate()->GetCurrentContext()->AllowCodeGenerationFromStrings(
+        args[0].As<v8::Boolean>()->Value());
+  }
+
+  static void SetResourceNamePrefix(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    if (args.Length() != 1 || !args[0]->IsString()) {
+      return;
+    }
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
+    IsolateData* data = IsolateData::FromContext(context);
+    data->SetResourceNamePrefix(v8::Local<v8::String>::Cast(args[0]));
+  }
+};
+
+using CharVector = v8::internal::Vector<const char>;
+
+void FuzzInspector(const uint8_t* data, size_t size) {
+  base::Semaphore ready_semaphore(0);
+
+  IsolateData::SetupGlobalTasks frontend_extensions;
+  frontend_extensions.emplace_back(new UtilsExtension());
+  TaskRunner frontend_runner(std::move(frontend_extensions), true,
+                             &ready_semaphore, nullptr, false);
+  ready_semaphore.Wait();
+
+  int frontend_context_group_id = 0;
+  RunSyncTask(&frontend_runner,
+              [&frontend_context_group_id](IsolateData* data) {
+                frontend_context_group_id = data->CreateContextGroup();
+              });
+
+  IsolateData::SetupGlobalTasks backend_extensions;
+  backend_extensions.emplace_back(new SetTimeoutExtension());
+  backend_extensions.emplace_back(new InspectorExtension());
+  TaskRunner backend_runner(std::move(backend_extensions), false,
+                            &ready_semaphore, nullptr, true);
+  ready_semaphore.Wait();
+  UtilsExtension::set_backend_task_runner(&backend_runner);
+
+  task_runners.push_back(&frontend_runner);
+  task_runners.push_back(&backend_runner);
+
+  frontend_runner.Append(new ExecuteStringTask(
+      std::string{reinterpret_cast<const char*>(data), size},
+      frontend_context_group_id));
+
+  frontend_runner.Join();
+  backend_runner.Join();
+
+  UtilsExtension::ClearAllSessions();
+
+  // TaskRunners go out of scope here, which causes Isolate teardown and all
+  // running background tasks to be properly joined.
+}
+
+}  //  namespace
+}  // namespace internal
+}  // namespace v8
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  v8::internal::FuzzInspector(data, size);
+  return 0;
+}

test/fuzzer/inspector/foo

@@ -0,0 +1 @@
+smoke test

test/fuzzer/testcfg.py

@@ -8,10 +8,11 @@ from testrunner.local import testsuite
 from testrunner.objects import testcase
 
 SUB_TESTS = [
+  'inspector',
   'json',
   'parser',
-  'regexp_builtins',
   'regexp',
+  'regexp_builtins',
   'multi_return',
   'wasm',
   'wasm_async',

test/inspector/BUILD.gn

@@ -4,12 +4,9 @@
 
 import("../../gni/v8.gni")
 
-v8_executable("inspector-test") {
-  testonly = true
-
+v8_source_set("inspector_test") {
   sources = [
     "frontend-channel.h",
-    "inspector-test.cc",
     "isolate-data.cc",
     "isolate-data.h",
     "task-runner.cc",
@@ -20,16 +17,28 @@ v8_executable("inspector-test") {
     "utils.h",
   ]
 
+  configs = [ "../..:internal_config_base" ]
+
+  public_deps = [
+    "../..:v8",
+    "../..:v8_libbase",
+    "../..:v8_libplatform",
+    "../../src/inspector:inspector_test_headers",
+  ]
+}
+
+v8_executable("inspector-test") {
+  testonly = true
+
+  sources = [ "inspector-test.cc" ]
+
   configs = [
     "../..:external_config",
     "../..:internal_config_base",
   ]
 
   deps = [
-    "../..:v8",
-    "../..:v8_libbase",
-    "../..:v8_libplatform",
-    "../../src/inspector:inspector_test_headers",
+    ":inspector_test",
     "//build/win:default_exe_manifest",
   ]