ipc: Write end-to-end tests for SharedMemoryHandle brokering on Mac.

ipc/attachment_broker_mac_unittest.cc

Index: ipc/attachment_broker_mac_unittest.cc
diff --git a/ipc/attachment_broker_mac_unittest.cc b/ipc/attachment_broker_mac_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..38b167dd386a97bb3e85a96f0fe7c366f87a0728
--- /dev/null
+++ b/ipc/attachment_broker_mac_unittest.cc
@@ -0,0 +1,828 @@
+// Copyright 2015 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.
+
+#include "build/build_config.h"
+
+#include <fcntl.h>
+#include <sys/mman.h>
+
+#include "base/command_line.h"
+#include "base/files/file_util.h"
+#include "base/files/scoped_file.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/shared_memory.h"
+#include "ipc/attachment_broker_privileged_mac.h"
+#include "ipc/attachment_broker_unprivileged_mac.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_test_base.h"
+#include "ipc/ipc_test_messages.h"
+#include "ipc/test_util_mac.h"
+
+namespace {
+
+const char kDataBuffer1[] = "This is some test data to write to the file.";
+const char kDataBuffer2[] = "Katy Perry is so cool.";

[Tom Sepez, 2015/10/09 22:38:47]

nit: some may frown on this level of colloquialism and or/endorsement.  Dunno.

[erikchen, 2015/10/09 23:14:43]

I kept the flippancy but removed the proper nouns.

+const char kDataBuffer3[] = "Taylor Swift is so cool.";
+const char kDataBuffer4[] = "Justin Bieber is so cool.";
+const std::string g_service_switch_name = "service_name";
+
+enum TestResult {
+  RESULT_UNKNOWN,
+  RESULT_SUCCESS,
+  RESULT_FAILURE,
+};
+
+base::mac::ScopedMachSendRight GetMachPortFromBrokeredAttachment(
+    const scoped_refptr<IPC::BrokerableAttachment>& attachment) {
+  if (attachment->GetType() !=
+      IPC::BrokerableAttachment::TYPE_BROKERABLE_ATTACHMENT) {
+    LOG(INFO) << "Attachment type not TYPE_BROKERABLE_ATTACHMENT.";
+    return base::mac::ScopedMachSendRight(MACH_PORT_NULL);
+  }
+
+  if (attachment->GetBrokerableType() != IPC::BrokerableAttachment::MACH_PORT) {
+    LOG(INFO) << "Brokerable type not MACH_PORT.";
+    return base::mac::ScopedMachSendRight(MACH_PORT_NULL);
+  }
+
+  IPC::internal::MachPortAttachmentMac* received_mach_port_attachment =
+      static_cast<IPC::internal::MachPortAttachmentMac*>(attachment.get());
+  return base::mac::ScopedMachSendRight(
+      received_mach_port_attachment->get_mach_port());
+}
+
+// Makes a Mach port backed SharedMemory region and fills it with |contents|.
+scoped_ptr<base::SharedMemory> MakeSharedMemory(const std::string& contents) {
+  base::SharedMemoryHandle shm(contents.size());
+  if (!shm.IsValid()) {
+    LOG(ERROR) << "Failed to make SharedMemoryHandle.";
+    return nullptr;
+  }
+  scoped_ptr<base::SharedMemory> shared_memory(
+      new base::SharedMemory(shm, false));
+  shared_memory->Map(contents.size());
+  memcpy(shared_memory->memory(), contents.c_str(), contents.size());
+  return shared_memory;
+}
+
+// |message| must be deserializable as a TestSharedMemoryHandleMsg1.
+base::SharedMemoryHandle GetSharedMemoryHandleFromMsg1(
+    const IPC::Message& message) {
+  // Expect a message with a brokered attachment.
+  if (!message.HasBrokerableAttachments()) {
+    LOG(ERROR) << "Message missing brokerable attachment.";
+    return base::SharedMemoryHandle();
+  }
+
+  TestSharedMemoryHandleMsg1::Schema::Param p;
+  if (!TestSharedMemoryHandleMsg1::Read(&message, &p)) {
+    LOG(ERROR) << "Failed to deserialize message.";
+    return base::SharedMemoryHandle();
+  }
+
+  return base::get<1>(p);
+}
+
+// |message| must be deserializable as a TestSharedMemoryHandleMsg2. Returns
+// whether deserialization was successful. |handle1| and |handle2| are output
+// variables populated on success.
+bool GetSharedMemoryHandlesFromMsg2(const IPC::Message& message,
+                                    base::SharedMemoryHandle* handle1,
+                                    base::SharedMemoryHandle* handle2) {
+  // Expect a message with a brokered attachment.
+  if (!message.HasBrokerableAttachments()) {
+    LOG(ERROR) << "Message missing brokerable attachment.";
+    return false;
+  }
+
+  TestSharedMemoryHandleMsg2::Schema::Param p;
+  if (!TestSharedMemoryHandleMsg2::Read(&message, &p)) {
+    LOG(ERROR) << "Failed to deserialize message.";
+    return false;
+  }
+
+  *handle1 = base::get<0>(p);
+  *handle2 = base::get<1>(p);
+  return true;
+}
+
+// Returns |nullptr| on error.
+scoped_ptr<base::SharedMemory> MapSharedMemoryHandle(
+    const base::SharedMemoryHandle& shm) {
+  if (!shm.IsValid()) {
+    LOG(ERROR) << "Invalid SharedMemoryHandle";
+    return nullptr;
+  }
+
+  size_t size;
+  if (!shm.GetSize(&size)) {
+    LOG(ERROR) << "Couldn't get size of SharedMemoryHandle";
+    return nullptr;
+  }
+
+  scoped_ptr<base::SharedMemory> shared_memory(
+      new base::SharedMemory(shm, false));
+  shared_memory->Map(size);
+  return shared_memory;
+}
+
+// This method maps the SharedMemoryHandle, checks the contents, and then
+// consumes a reference to the underlying Mach port.
+bool CheckContentsOfSharedMemoryHandle(const base::SharedMemoryHandle& shm,
+                                       const std::string& contents) {
+  scoped_ptr<base::SharedMemory> shared_memory(MapSharedMemoryHandle(shm));
+
+  if (memcmp(shared_memory->memory(), contents.c_str(), contents.size()) != 0) {
+    LOG(ERROR) << "Shared Memory contents not equivalent";
+    return false;
+  }
+  return true;
+}
+
+// This method mmaps the FileDescriptor, checks the contents, and then munmaps
+// the FileDescriptor and closes the underlying fd.
+bool CheckContentsOfFileDescriptor(const base::FileDescriptor& file_descriptor,
+                                   const std::string& contents) {
+  base::ScopedFD fd_closer(file_descriptor.fd);
+  lseek(file_descriptor.fd, 0, SEEK_SET);
+  char* buffer = static_cast<char*>(malloc(contents.size()));

[Tom Sepez, 2015/10/09 22:38:47]

nit: scoped pointers of some flavor would help here.

[erikchen, 2015/10/09 23:14:43]

Done.

+  if (!base::ReadFromFD(file_descriptor.fd, buffer, contents.size())) {
+    free(buffer);
+    return false;
+  }
+
+  int result = memcmp(buffer, contents.c_str(), contents.size());
+  free(buffer);
+  return result == 0;
+}
+
+// Open |fp| and populate it with |contents|.
+base::FileDescriptor MakeFileDescriptor(const base::FilePath& fp,
+                                        const std::string& contents) {
+  int fd = open(fp.value().c_str(), O_RDWR, S_IWUSR | S_IRUSR);
+  base::ScopedFD fd_closer(fd);
+  if (fd <= 0) {
+    LOG(ERROR) << "Error opening file at: " << fp.value();
+    return base::FileDescriptor();
+  }
+
+  if (lseek(fd, 0, SEEK_SET) != 0) {
+    LOG(ERROR) << "Error changing offset";
+    return base::FileDescriptor();
+  }
+
+  if (write(fd, contents.c_str(), contents.size()) !=
+      static_cast<ssize_t>(contents.size())) {
+    LOG(ERROR) << "Error writing to file";
+    return base::FileDescriptor();
+  }
+
+  return base::FileDescriptor(fd_closer.release(), true);
+}
+
+// Maps both handles, then checks that their contents matches |contents|. Then
+// checks that changes to one are reflected in the other. Then consumes
+// references to both underlying Mach ports.
+bool CheckContentsOfTwoEquivalentSharedMemoryHandles(
+    const base::SharedMemoryHandle& handle1,
+    const base::SharedMemoryHandle& handle2,
+    const std::string& contents) {
+  scoped_ptr<base::SharedMemory> shared_memory1(MapSharedMemoryHandle(handle1));
+  scoped_ptr<base::SharedMemory> shared_memory2(MapSharedMemoryHandle(handle2));
+
+  if (memcmp(shared_memory1->memory(), contents.c_str(), contents.size()) !=
+      0) {
+    LOG(ERROR) << "Incorrect contents in shared_memory1";
+    return false;
+  }
+
+  if (memcmp(shared_memory1->memory(), shared_memory2->memory(),
+             contents.size()) != 0) {
+    LOG(ERROR) << "Incorrect contents in shared_memory2";
+    return false;
+  }
+
+  // Updating shared_memory1 should update shared_memory2.
+  char* start = static_cast<char*>(shared_memory1->memory());

[Tom Sepez, 2015/10/09 22:38:47]

You may need volatiles and memory barriers here, in theory, to get consistent
resuls.

[erikchen, 2015/10/09 23:14:43]

Given that the store/load are happening on the same thread, I'd imagine that
memory barriers are not required on x86. If you want, I can ask thakis@ or mark@
to take a look at this.

+  start[0] += 5;
+  if (memcmp(shared_memory1->memory(), shared_memory2->memory(),

[Tom Sepez, 2015/10/09 22:38:47]

Would like a better test, eg. blat a known string into memory 1, then compare
against the string from memory2.

[erikchen, 2015/10/09 23:14:43]

Done.

+             contents.size()) != 0) {
+    LOG(ERROR) << "Incorrect contents in shared_memory2";
+    return false;
+  }
+
+  return true;
+}
+
+// |message| must be deserializable as a TestSharedMemoryHandleMsg1. Returns
+// whether the contents of the attached shared memory region matches |contents|.
+// Consumes a reference to the underlying Mach port.
+bool CheckContentsOfMessage1(const IPC::Message& message,
+                             const std::string& contents) {
+  base::SharedMemoryHandle shm(GetSharedMemoryHandleFromMsg1(message));
+  return CheckContentsOfSharedMemoryHandle(shm, contents);
+}
+
+// Once the test is finished, send a control message to the parent process with
+// the result. The message may require the runloop to be run before its
+// dispatched.
+void SendControlMessage(IPC::Sender* sender, bool success) {
+  IPC::Message* message = new IPC::Message(0, 2, IPC::Message::PRIORITY_NORMAL);
+  TestResult result = success ? RESULT_SUCCESS : RESULT_FAILURE;
+  message->WriteInt(result);
+  sender->Send(message);
+}
+
+// Records the most recently received brokerable attachment's id.
+class AttachmentBrokerObserver : public IPC::AttachmentBroker::Observer {
+ public:
+  void ReceivedBrokerableAttachmentWithId(
+      const IPC::BrokerableAttachment::AttachmentId& id) override {
+    id_ = id;
+  }
+  IPC::BrokerableAttachment::AttachmentId* get_id() { return &id_; }
+
+ private:
+  IPC::BrokerableAttachment::AttachmentId id_;
+};
+
+// A broker which always sets the current process as the destination process
+// for attachments.
+class MockBroker : public IPC::AttachmentBrokerUnprivilegedMac {
+ public:
+  MockBroker() {}
+  ~MockBroker() override {}
+  bool SendAttachmentToProcess(IPC::BrokerableAttachment* attachment,
+                               base::ProcessId destination_process) override {
+    return IPC::AttachmentBrokerUnprivilegedMac::SendAttachmentToProcess(
+        attachment, base::Process::Current().Pid());
+  }
+};
+
+// Forwards all messages to |listener_|.  Quits the message loop after a
+// message is received, or the channel has an error.
+class ProxyListener : public IPC::Listener {
+ public:
+  ProxyListener() : listener_(nullptr), reason_(MESSAGE_RECEIVED) {}
+  ~ProxyListener() override {}
+
+  // The reason for exiting the message loop.
+  enum Reason { MESSAGE_RECEIVED, CHANNEL_ERROR };
+
+  bool OnMessageReceived(const IPC::Message& message) override {
+    bool result = false;
+    if (listener_)
+      result = listener_->OnMessageReceived(message);
+    reason_ = MESSAGE_RECEIVED;
+    messages_.push_back(message);
+    base::MessageLoop::current()->QuitNow();
+    return result;
+  }
+
+  void OnChannelError() override {
+    reason_ = CHANNEL_ERROR;
+    base::MessageLoop::current()->QuitNow();
+  }
+
+  void set_listener(IPC::Listener* listener) { listener_ = listener; }
+  Reason get_reason() { return reason_; }
+  IPC::Message get_first_message() { return messages_[0]; }

[Tom Sepez, 2015/10/09 22:38:47]

these two should probably assert !empty.

[erikchen, 2015/10/09 23:14:43]

Done.

+  void pop_first_message() { messages_.erase(messages_.begin()); }
+  bool has_message() { return !messages_.empty(); }
+
+ private:
+  IPC::Listener* listener_;
+  Reason reason_;
+  std::vector<IPC::Message> messages_;
+};
+
+// Waits for a result to be sent over the channel. Quits the message loop
+// after a message is received, or the channel has an error.
+class ResultListener : public IPC::Listener {
+ public:
+  ResultListener() : result_(RESULT_UNKNOWN) {}
+  ~ResultListener() override {}
+
+  bool OnMessageReceived(const IPC::Message& message) override {
+    base::PickleIterator iter(message);
+
+    int result;
+    EXPECT_TRUE(iter.ReadInt(&result));
+    result_ = static_cast<TestResult>(result);
+    return true;
+  }
+
+  TestResult get_result() { return result_; }
+
+ private:
+  TestResult result_;
+};
+
+class MockPortProvider : public base::PortProvider {
+ public:
+  mach_port_t TaskForPid(base::ProcessHandle process) const override {
+    auto it = port_map_.find(process);
+    if (it != port_map_.end())
+      return it->second;
+    return MACH_PORT_NULL;
+  }
+
+  void InsertEntry(base::ProcessHandle process, mach_port_t task_port) {
+    port_map_[process] = task_port;
+  }
+
+ private:
+  std::map<base::ProcessHandle, mach_port_t> port_map_;
+};
+
+// End-to-end tests for the attachment brokering process on Mac.
+// The parent process acts as an unprivileged process. The child process acts
+// as the privileged process.
+class IPCAttachmentBrokerMacTest : public IPCTestBase {
+ public:
+  IPCAttachmentBrokerMacTest() {}
+  ~IPCAttachmentBrokerMacTest() override {}
+
+  base::CommandLine MakeCmdLine(const std::string& procname) override {
+    base::CommandLine command_line = IPCTestBase::MakeCmdLine(procname);
+    // Pass the service name to the child process.
+    command_line.AppendSwitchASCII(g_service_switch_name, service_name_);
+    return command_line;
+  }
+
+  // Takes ownership of |broker|. Has no effect if called after CommonSetUp().
+  void SetBroker(IPC::AttachmentBrokerUnprivilegedMac* broker) {
+    broker_.reset(broker);
+  }
+
+  // Setup shared between tests.
+  void CommonSetUp(const char* name) {
+    Init(name);
+    service_name_ = IPC::CreateRandomServiceName();
+    server_port_.reset(IPC::BecomeMachServer(service_name_.c_str()).release());
+
+    if (!broker_.get())
+      SetBroker(new IPC::AttachmentBrokerUnprivilegedMac);
+
+    broker_->AddObserver(&observer_);
+    CreateChannel(&proxy_listener_);
+    broker_->DesignateBrokerCommunicationChannel(channel());
+    ASSERT_TRUE(ConnectChannel());
+    ASSERT_TRUE(StartClient());
+
+    client_port_.reset(IPC::ReceiveMachPort(server_port_).release());
+    IPC::SendMachPort(client_port_, mach_task_self(), MACH_MSG_TYPE_COPY_SEND);
+    active_names_at_start_ = IPC::GetActiveNameCount();
+    get_proxy_listener()->set_listener(&result_listener_);
+  }
+
+  void CheckChildResult() {
+    ASSERT_EQ(ProxyListener::MESSAGE_RECEIVED,
+              get_proxy_listener()->get_reason());
+    ASSERT_EQ(get_result_listener()->get_result(), RESULT_SUCCESS);
+  }
+
+  void FinalCleanUp() {
+    // There should be no leaked names.
+    EXPECT_EQ(active_names_at_start_, IPC::GetActiveNameCount());
+
+    // Close the channel so the client's OnChannelError() gets fired.
+    channel()->Close();
+
+    EXPECT_TRUE(WaitForClientShutdown());
+    DestroyChannel();
+    broker_.reset();
+  }
+
+  // Teardown shared between most tests.
+  void CommonTearDown() {
+    CheckChildResult();
+    FinalCleanUp();
+  }
+
+  // Makes a SharedMemory region, fills it with |contents|, sends the handle
+  // over Chrome IPC, and unmaps the region.
+  void SendMessage1(const std::string& contents) {
+    scoped_ptr<base::SharedMemory> shared_memory(MakeSharedMemory(contents));
+    IPC::Message* message =
+        new TestSharedMemoryHandleMsg1(100, shared_memory->handle(), 200);
+    sender()->Send(message);
+  }
+
+  ProxyListener* get_proxy_listener() { return &proxy_listener_; }
+  IPC::AttachmentBrokerUnprivilegedMac* get_broker() { return broker_.get(); }
+  AttachmentBrokerObserver* get_observer() { return &observer_; }
+  ResultListener* get_result_listener() { return &result_listener_; }
+
+ private:
+  ProxyListener proxy_listener_;
+  scoped_ptr<IPC::AttachmentBrokerUnprivilegedMac> broker_;
+  AttachmentBrokerObserver observer_;
+
+  // A port on which the main process listens for mach messages from the child
+  // process.
+  base::mac::ScopedMachReceiveRight server_port_;
+
+  // A port on which the child process listens for mach messages from the main
+  // process.
+  base::mac::ScopedMachSendRight client_port_;
+
+  // The number of active names immediately after set up.
+  mach_msg_type_number_t active_names_at_start_;
+
+  std::string service_name_;
+
+  ResultListener result_listener_;
+};
+
+using OnMessageReceivedCallback = void (*)(IPC::Sender* sender,
+                                           const IPC::Message& message);
+
+// These objects are globally accessible, and are expected to outlive all IPC
+// Channels.
+struct ChildProcessGlobals {
+  IPC::AttachmentBrokerPrivilegedMac broker;
+  MockPortProvider port_provider;
+  base::mac::ScopedMachSendRight server_task_port;
+};
+
+// Sets up the Mach communication ports with the server. Returns a set of
+// globals that must live at least as long as the test.
+scoped_ptr<ChildProcessGlobals> CommonChildProcessSetUp() {
+  base::CommandLine cmd_line = *base::CommandLine::ForCurrentProcess();
+  std::string service_name =
+      cmd_line.GetSwitchValueASCII(g_service_switch_name);
+  base::mac::ScopedMachSendRight server_port(
+      IPC::LookupServer(service_name.c_str()));
+  base::mac::ScopedMachReceiveRight client_port(IPC::MakeReceivingPort());
+
+  // Send the port that this process is listening on to the server.
+  IPC::SendMachPort(server_port, client_port, MACH_MSG_TYPE_MAKE_SEND);
+
+  // Receive the task port of the server process.
+  base::mac::ScopedMachSendRight server_task_port(
+      IPC::ReceiveMachPort(client_port));
+
+  scoped_ptr<ChildProcessGlobals> globals(new ChildProcessGlobals);
+  globals->port_provider.InsertEntry(getppid(), server_task_port);
+  globals->broker.SetPortProvider(&globals->port_provider);
+  globals->server_task_port.reset(server_task_port.release());
+  return globals;
+}
+
+int CommonPrivilegedProcessMain(OnMessageReceivedCallback callback,
+                                const char* channel_name) {
+  LOG(INFO) << "Privileged process start.";
+  scoped_ptr<ChildProcessGlobals> globals(CommonChildProcessSetUp());
+
+  mach_msg_type_number_t active_names_at_start = IPC::GetActiveNameCount();
+
+  base::MessageLoopForIO main_message_loop;
+  ProxyListener listener;
+
+  scoped_ptr<IPC::Channel> channel(IPC::Channel::CreateClient(
+      IPCTestBase::GetChannelName(channel_name), &listener));
+  globals->broker.RegisterCommunicationChannel(channel.get());
+  CHECK(channel->Connect());
+
+  while (true) {
+    LOG(INFO) << "Privileged process spinning run loop.";
+    base::MessageLoop::current()->Run();
+    ProxyListener::Reason reason = listener.get_reason();
+    if (reason == ProxyListener::CHANNEL_ERROR)
+      break;
+
+    while (listener.has_message()) {
+      LOG(INFO) << "Privileged process running callback.";
+      callback(channel.get(), listener.get_first_message());
+      LOG(INFO) << "Privileged process finishing callback.";
+      listener.pop_first_message();
+    }
+  }
+
+  if (active_names_at_start != IPC::GetActiveNameCount()) {
+    LOG(INFO) << "Memory leak!.";
+  }
+  LOG(INFO) << "Privileged process end.";
+  return 0;
+}
+
+// An unprivileged process makes a shared memory region, and writes a string to
+// it. The SharedMemoryHandle is sent to the privileged process using Chrome
+// IPC. The privileged process checks that it received the same memory region.
+TEST_F(IPCAttachmentBrokerMacTest, SendSharedMemoryHandle) {
+  CommonSetUp("SendSharedMemoryHandle");
+
+  SendMessage1(kDataBuffer1);
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendSharedMemoryHandleCallback(IPC::Sender* sender,
+                                    const IPC::Message& message) {
+  bool success = CheckContentsOfMessage1(message, kDataBuffer1);
+  SendControlMessage(sender, success);
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendSharedMemoryHandle) {
+  return CommonPrivilegedProcessMain(&SendSharedMemoryHandleCallback,
+                                     "SendSharedMemoryHandle");
+}
+
+// Similar to SendSharedMemoryHandle, but sends a very long shared memory
+// region.
+TEST_F(IPCAttachmentBrokerMacTest, SendSharedMemoryHandleLong) {
+  CommonSetUp("SendSharedMemoryHandleLong");
+
+  std::string buffer(1 << 23, 'a');
+  SendMessage1(buffer);
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendSharedMemoryHandleLongCallback(IPC::Sender* sender,
+                                        const IPC::Message& message) {
+  std::string buffer(1 << 23, 'a');
+  bool success = CheckContentsOfMessage1(message, buffer);
+  SendControlMessage(sender, success);
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendSharedMemoryHandleLong) {
+  return CommonPrivilegedProcessMain(&SendSharedMemoryHandleLongCallback,
+                                     "SendSharedMemoryHandleLong");
+}
+
+// Similar to SendSharedMemoryHandle, but sends two different shared memory
+// regions in two messages.
+TEST_F(IPCAttachmentBrokerMacTest, SendTwoMessagesDifferentSharedMemoryHandle) {
+  CommonSetUp("SendTwoMessagesDifferentSharedMemoryHandle");
+
+  SendMessage1(kDataBuffer1);
+  SendMessage1(kDataBuffer2);
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendTwoMessagesDifferentSharedMemoryHandleCallback(
+    IPC::Sender* sender,
+    const IPC::Message& message) {
+  static int count = 0;
+  static bool success = true;
+  ++count;
+  if (count == 1) {
+    success &= CheckContentsOfMessage1(message, kDataBuffer1);
+  } else if (count == 2) {
+    success &= CheckContentsOfMessage1(message, kDataBuffer2);
+    SendControlMessage(sender, success);
+  }
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendTwoMessagesDifferentSharedMemoryHandle) {
+  return CommonPrivilegedProcessMain(
+      &SendTwoMessagesDifferentSharedMemoryHandleCallback,
+      "SendTwoMessagesDifferentSharedMemoryHandle");
+}
+
+// Similar to SendSharedMemoryHandle, but sends the same shared memory region in
+// two messages.
+TEST_F(IPCAttachmentBrokerMacTest, SendTwoMessagesSameSharedMemoryHandle) {
+  CommonSetUp("SendTwoMessagesSameSharedMemoryHandle");
+
+  {
+    scoped_ptr<base::SharedMemory> shared_memory(
+        MakeSharedMemory(kDataBuffer1));
+
+    for (int i = 0; i < 2; ++i) {
+      IPC::Message* message =
+          new TestSharedMemoryHandleMsg1(100, shared_memory->handle(), 200);
+      sender()->Send(message);
+    }
+  }
+
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendTwoMessagesSameSharedMemoryHandleCallback(
+    IPC::Sender* sender,
+    const IPC::Message& message) {
+  static int count = 0;
+  static base::SharedMemoryHandle handle1;
+  ++count;
+
+  if (count == 1) {
+    handle1 = GetSharedMemoryHandleFromMsg1(message);
+  } else if (count == 2) {
+    base::SharedMemoryHandle handle2(GetSharedMemoryHandleFromMsg1(message));
+
+    bool success = CheckContentsOfTwoEquivalentSharedMemoryHandles(
+        handle1, handle2, kDataBuffer1);
+    SendControlMessage(sender, success);
+  }
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendTwoMessagesSameSharedMemoryHandle) {
+  return CommonPrivilegedProcessMain(
+      &SendTwoMessagesSameSharedMemoryHandleCallback,
+      "SendTwoMessagesSameSharedMemoryHandle");
+}
+
+// Similar to SendSharedMemoryHandle, but sends one message with two different
+// memory regions.
+TEST_F(IPCAttachmentBrokerMacTest,
+       SendOneMessageWithTwoDifferentSharedMemoryHandles) {
+  CommonSetUp("SendOneMessageWithTwoDifferentSharedMemoryHandles");
+
+  {
+    scoped_ptr<base::SharedMemory> shared_memory1(
+        MakeSharedMemory(kDataBuffer1));
+    scoped_ptr<base::SharedMemory> shared_memory2(
+        MakeSharedMemory(kDataBuffer2));
+    IPC::Message* message = new TestSharedMemoryHandleMsg2(
+        shared_memory1->handle(), shared_memory2->handle());
+    sender()->Send(message);
+  }
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendOneMessageWithTwoDifferentSharedMemoryHandlesCallback(
+    IPC::Sender* sender,
+    const IPC::Message& message) {
+  base::SharedMemoryHandle handle1;
+  base::SharedMemoryHandle handle2;
+  if (!GetSharedMemoryHandlesFromMsg2(message, &handle1, &handle2)) {
+    LOG(ERROR) << "Failed to deserialize message.";
+    SendControlMessage(sender, false);
+    return;
+  }
+
+  bool success = CheckContentsOfSharedMemoryHandle(handle1, kDataBuffer1) &&
+                 CheckContentsOfSharedMemoryHandle(handle2, kDataBuffer2);
+  SendControlMessage(sender, success);
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(
+    SendOneMessageWithTwoDifferentSharedMemoryHandles) {
+  return CommonPrivilegedProcessMain(
+      &SendOneMessageWithTwoDifferentSharedMemoryHandlesCallback,
+      "SendOneMessageWithTwoDifferentSharedMemoryHandles");
+}
+
+// Similar to SendSharedMemoryHandle, but sends one message that contains the
+// same memory region twice.
+TEST_F(IPCAttachmentBrokerMacTest,
+       SendOneMessageWithTwoSameSharedMemoryHandles) {
+  CommonSetUp("SendOneMessageWithTwoSameSharedMemoryHandles");
+
+  {
+    scoped_ptr<base::SharedMemory> shared_memory(
+        MakeSharedMemory(kDataBuffer1));
+    IPC::Message* message = new TestSharedMemoryHandleMsg2(
+        shared_memory->handle(), shared_memory->handle());
+    sender()->Send(message);
+  }
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendOneMessageWithTwoSameSharedMemoryHandlesCallback(
+    IPC::Sender* sender,
+    const IPC::Message& message) {
+  base::SharedMemoryHandle handle1;
+  base::SharedMemoryHandle handle2;
+  if (!GetSharedMemoryHandlesFromMsg2(message, &handle1, &handle2)) {
+    LOG(ERROR) << "Failed to deserialize message.";
+    SendControlMessage(sender, false);
+    return;
+  }
+
+  bool success = CheckContentsOfTwoEquivalentSharedMemoryHandles(
+      handle1, handle2, kDataBuffer1);
+  SendControlMessage(sender, success);
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(
+    SendOneMessageWithTwoSameSharedMemoryHandles) {
+  return CommonPrivilegedProcessMain(
+      &SendOneMessageWithTwoSameSharedMemoryHandlesCallback,
+      "SendOneMessageWithTwoSameSharedMemoryHandles");
+}
+
+// Sends one message with two Posix FDs and two Mach ports.
+TEST_F(IPCAttachmentBrokerMacTest, SendPosixFDAndMachPort) {
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+  base::FilePath fp1, fp2;
+  ASSERT_TRUE(base::CreateTemporaryFileInDir(temp_dir.path(), &fp1));
+  ASSERT_TRUE(base::CreateTemporaryFileInDir(temp_dir.path(), &fp2));
+
+  CommonSetUp("SendPosixFDAndMachPort");
+
+  {
+    scoped_ptr<base::SharedMemory> shared_memory1(
+        MakeSharedMemory(kDataBuffer1));
+    scoped_ptr<base::SharedMemory> shared_memory2(
+        MakeSharedMemory(kDataBuffer2));
+
+    base::FileDescriptor file_descriptor1(
+        MakeFileDescriptor(fp1, kDataBuffer3));
+    base::FileDescriptor file_descriptor2(
+        MakeFileDescriptor(fp2, kDataBuffer4));
+
+    IPC::Message* message = new TestSharedMemoryHandleMsg3(
+        file_descriptor1, shared_memory1->handle(), file_descriptor2,
+        shared_memory2->handle());
+    sender()->Send(message);
+  }
+
+  base::MessageLoop::current()->Run();
+  CommonTearDown();
+}
+
+void SendPosixFDAndMachPortCallback(IPC::Sender* sender,
+                                    const IPC::Message& message) {
+  TestSharedMemoryHandleMsg3::Schema::Param p;
+  if (!TestSharedMemoryHandleMsg3::Read(&message, &p)) {
+    LOG(ERROR) << "Failed to deserialize message.";
+    SendControlMessage(sender, false);
+    return;
+  }
+
+  base::SharedMemoryHandle handle1 = base::get<1>(p);
+  base::SharedMemoryHandle handle2 = base::get<3>(p);
+  bool success1 = CheckContentsOfSharedMemoryHandle(handle1, kDataBuffer1) &&
+                  CheckContentsOfSharedMemoryHandle(handle2, kDataBuffer2);
+  if (!success1)
+    LOG(ERROR) << "SharedMemoryHandles have wrong contents.";
+
+  bool success2 =
+      CheckContentsOfFileDescriptor(base::get<0>(p), kDataBuffer3) &&
+      CheckContentsOfFileDescriptor(base::get<2>(p), kDataBuffer4);
+  if (!success2)
+    LOG(ERROR) << "FileDescriptors have wrong contents.";
+
+  SendControlMessage(sender, success1 && success2);
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendPosixFDAndMachPort) {
+  return CommonPrivilegedProcessMain(&SendPosixFDAndMachPortCallback,
+                                     "SendPosixFDAndMachPort");
+}
+
+// Similar to SendHandle, except the attachment's destination process is this
+// process. This is an unrealistic scenario, but simulates an unprivileged
+// process sending an attachment to another unprivileged process.
+TEST_F(IPCAttachmentBrokerMacTest, SendSharedMemoryHandleToSelf) {
+  SetBroker(new MockBroker);
+  CommonSetUp("SendSharedMemoryHandleToSelf");
+
+  // Technically, the channel is an endpoint, but we need the proxy listener to
+  // receive the messages so that it can quit the message loop.
+  channel()->SetAttachmentBrokerEndpoint(false);
+  get_proxy_listener()->set_listener(get_broker());
+
+  {
+    scoped_ptr<base::SharedMemory> shared_memory(
+        MakeSharedMemory(kDataBuffer1));
+    mach_port_urefs_t ref_count = IPC::GetMachRefCount(
+        shared_memory->handle().GetMemoryObject(), MACH_PORT_RIGHT_SEND);
+
+    IPC::Message* message =
+        new TestSharedMemoryHandleMsg1(100, shared_memory->handle(), 200);
+    sender()->Send(message);
+    base::MessageLoop::current()->Run();
+
+    // Get the received attachment.
+    IPC::BrokerableAttachment::AttachmentId* id = get_observer()->get_id();
+    scoped_refptr<IPC::BrokerableAttachment> received_attachment;
+    get_broker()->GetAttachmentWithId(*id, &received_attachment);
+    ASSERT_NE(received_attachment.get(), nullptr);
+
+    // Check that it's has the same name, but that the ref count has increased.
+    base::mac::ScopedMachSendRight memory_object(
+        GetMachPortFromBrokeredAttachment(received_attachment));
+    ASSERT_EQ(memory_object, shared_memory->handle().GetMemoryObject());
+    EXPECT_EQ(ref_count + 1,
+              IPC::GetMachRefCount(shared_memory->handle().GetMemoryObject(),
+                                   MACH_PORT_RIGHT_SEND));
+  }
+
+  FinalCleanUp();
+}
+
+void SendSharedMemoryHandleToSelfCallback(IPC::Sender* sender,
+                                          const IPC::Message&) {
+  // Do nothing special. The default behavior already runs the
+  // AttachmentBrokerPrivilegedMac.
+}
+
+MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendSharedMemoryHandleToSelf) {
+  return CommonPrivilegedProcessMain(&SendSharedMemoryHandleToSelfCallback,
+                                     "SendSharedMemoryHandleToSelf");
+}
+
+}  // namespace