[Windows Sandbox Tests] Process Mitigations.

sandbox/win/src/process_mitigations_unittest.cc

+// Copyright 2011 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 "sandbox/win/src/process_mitigations.h"
+
+#include <windows.h>
+
+#include "base/files/file_util.h"
+#include "base/path_service.h"
+#include "base/scoped_native_library.h"
+#include "base/test/test_timeouts.h"
+#include "base/win/windows_version.h"
+#include "sandbox/win/src/nt_internals.h"
+#include "sandbox/win/src/target_services.h"
+#include "sandbox/win/tests/common/controller.h"
+#include "sandbox/win/tests/integration_tests/integration_tests_common.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+//------------------------------------------------------------------------------
+// Internal Defines & Functions
+//------------------------------------------------------------------------------
+
+// API defined in winbase.h.
+using GetProcessDEPPolicyFunction = decltype(&GetProcessDEPPolicy);
+
+// API defined in processthreadsapi.h.
+using GetProcessMitigationPolicyFunction =
+    decltype(&GetProcessMitigationPolicy);
+GetProcessMitigationPolicyFunction get_process_mitigation_policy;
+
+// APIs defined in wingdi.h.
+using AddFontMemResourceExFunction = decltype(&AddFontMemResourceEx);
+using RemoveFontMemResourceExFunction = decltype(&RemoveFontMemResourceEx);
+
+//------------------------------------------------------------------------------
+// NonSystemFont test helper function.
+//
+// 1. Pick font file and set up sandbox to allow read access to it.
+// 2. Trigger test child process (with or without mitigation enabled).
+//------------------------------------------------------------------------------
+void TestWin10NonSystemFont(bool is_success_test) {
+  base::FilePath font_path;
+  EXPECT_TRUE(base::PathService::Get(base::DIR_WINDOWS_FONTS, &font_path));
+  // Arial font should always be available
+  font_path = font_path.Append(L"arial.ttf");
+
+  sandbox::TestRunner runner;
+  EXPECT_TRUE(runner.AddFsRule(sandbox::TargetPolicy::FILES_ALLOW_READONLY,
+                               font_path.value().c_str()));
+
+  if (!is_success_test) {
+    sandbox::TargetPolicy* policy = runner.GetPolicy();
+    // Turn on the non-system font disable mitigation.
+    EXPECT_EQ(policy->SetProcessMitigations(
+                  sandbox::MITIGATION_NONSYSTEM_FONT_DISABLE),
+              sandbox::SBOX_ALL_OK);
+  }
+
+  std::wstring test_command = L"CheckWin10FontLoad \"";
+  test_command += font_path.value().c_str();
+  test_command += L"\"";
+
+  EXPECT_EQ((is_success_test ? sandbox::SBOX_TEST_SUCCEEDED
+                             : sandbox::SBOX_TEST_FAILED),
+            runner.RunTest(test_command.c_str()));
+}
+
+}  // namespace
+
+namespace sandbox {
+
+// File on disk, defined in extension point tests.
+extern const wchar_t g_hook_dll_file[];
+// Mutex to acquire before touching above resource.
+extern const wchar_t g_extension_point_test_mutex[];
+
+// Common function used for timeout with Win APIs like ::WaitForSingleObject().
+DWORD SboxTestEventTimeout() {
+  if (::IsDebuggerPresent())
+    return INFINITE;
+
+  return static_cast<DWORD>(
+      (TestTimeouts::action_timeout()).InMillisecondsRoundedUp());
+}
+
+//------------------------------------------------------------------------------
+// Exported functions called by child test processes.
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Common test function for checking that a policy was enabled.
+// - Use enum TestPolicy defined in integration_tests_common.h to specify which
+//   policy to check - passed as arg1.
+//------------------------------------------------------------------------------
+SBOX_TESTS_COMMAND int CheckPolicy(int argc, wchar_t** argv) {
+  if (argc < 1)
+    return SBOX_TEST_INVALID_PARAMETER;
+  int test = ::_wtoi(argv[0]);
+  if (!test)
+    return SBOX_TEST_INVALID_PARAMETER;
+
+  get_process_mitigation_policy =
+      reinterpret_cast<GetProcessMitigationPolicyFunction>(::GetProcAddress(
+          ::GetModuleHandleW(L"kernel32.dll"), "GetProcessMitigationPolicy"));
+  if (!get_process_mitigation_policy)
+    return SBOX_TEST_NOT_FOUND;
+
+  switch (test) {
+    //--------------------------------------------------
+    // MITIGATION_DEP
+    // MITIGATION_DEP_NO_ATL_THUNK
+    //--------------------------------------------------
+    case (TESTPOLICY_DEP): {
+#if !defined(_WIN64)
+      // DEP - always enabled on 64-bit.
+      PROCESS_MITIGATION_DEP_POLICY policy = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessDEPPolicy, &policy,
+                                         sizeof(policy))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy.Enable || !policy.Permanent)
+        return SBOX_TEST_FAILED;
+#endif  // !defined(_WIN64)
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_RELOCATE_IMAGE
+    // MITIGATION_RELOCATE_IMAGE_REQUIRED
+    //--------------------------------------------------
+    case (TESTPOLICY_ASLR): {
+      PROCESS_MITIGATION_ASLR_POLICY policy2 = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessASLRPolicy, &policy2,
+                                         sizeof(policy2))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy2.EnableForceRelocateImages || !policy2.DisallowStrippedImages)
+        return SBOX_TEST_FAILED;
+
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_STRICT_HANDLE_CHECKS
+    //--------------------------------------------------
+    case (TESTPOLICY_STRICTHANDLE): {
+      PROCESS_MITIGATION_STRICT_HANDLE_CHECK_POLICY policy3 = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessStrictHandleCheckPolicy,
+                                         &policy3, sizeof(policy3))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy3.RaiseExceptionOnInvalidHandleReference ||
+          !policy3.HandleExceptionsPermanentlyEnabled) {
+        return SBOX_TEST_FAILED;
+      }
+
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_WIN32K_DISABLE
+    //--------------------------------------------------
+    case (TESTPOLICY_WIN32K): {
+      PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY policy = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessSystemCallDisablePolicy,
+                                         &policy, sizeof(policy))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy.DisallowWin32kSystemCalls)
+        return SBOX_TEST_FAILED;
+
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_EXTENSION_POINT_DISABLE
+    //--------------------------------------------------
+    case (TESTPOLICY_EXTENSIONPOINT): {
+      PROCESS_MITIGATION_EXTENSION_POINT_DISABLE_POLICY policy = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessExtensionPointDisablePolicy,
+                                         &policy, sizeof(policy))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy.DisableExtensionPoints)
+        return SBOX_TEST_FAILED;
+
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_NONSYSTEM_FONT_DISABLE
+    //--------------------------------------------------
+    case (TESTPOLICY_NONSYSFONT): {
+      PROCESS_MITIGATION_FONT_DISABLE_POLICY policy = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessFontDisablePolicy, &policy,
+                                         sizeof(policy))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy.DisableNonSystemFonts)
+        return SBOX_TEST_FAILED;
+
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_IMAGE_LOAD_NO_REMOTE
+    //--------------------------------------------------
+    case (TESTPOLICY_LOADNOREMOTE): {
+      PROCESS_MITIGATION_IMAGE_LOAD_POLICY policy = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessImageLoadPolicy, &policy,
+                                         sizeof(policy))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy.NoRemoteImages)
+        return SBOX_TEST_FAILED;
+
+      break;
+    }
+    //--------------------------------------------------
+    // MITIGATION_IMAGE_LOAD_NO_LOW_LABEL
+    //--------------------------------------------------
+    case (TESTPOLICY_LOADNOLOW): {
+      PROCESS_MITIGATION_IMAGE_LOAD_POLICY policy = {};
+      if (!get_process_mitigation_policy(::GetCurrentProcess(),
+                                         ProcessImageLoadPolicy, &policy,
+                                         sizeof(policy))) {
+        return SBOX_TEST_NOT_FOUND;
+      }
+      if (!policy.NoLowMandatoryLabelImages)
+        return SBOX_TEST_FAILED;
+
+      break;
+    }
+    default:
+      return SBOX_TEST_INVALID_PARAMETER;
+  }
+
+  return SBOX_TEST_SUCCEEDED;
+}
+
+SBOX_TESTS_COMMAND int CheckDep(int argc, wchar_t** argv) {
+  GetProcessDEPPolicyFunction get_process_dep_policy =
+      reinterpret_cast<GetProcessDEPPolicyFunction>(::GetProcAddress(
+          ::GetModuleHandleW(L"kernel32.dll"), "GetProcessDEPPolicy"));
+  if (get_process_dep_policy) {
+    BOOL is_permanent = FALSE;
+    DWORD dep_flags = 0;
+
+    if (!get_process_dep_policy(::GetCurrentProcess(), &dep_flags,
+                                &is_permanent)) {
+      return SBOX_TEST_FIRST_ERROR;
+    }
+
+    if (!(dep_flags & PROCESS_DEP_ENABLE) || !is_permanent)
+      return SBOX_TEST_SECOND_ERROR;
+
+  } else {
+    NtQueryInformationProcessFunction query_information_process = NULL;
+    ResolveNTFunctionPtr("NtQueryInformationProcess",
+                         &query_information_process);
+    if (!query_information_process)
+      return SBOX_TEST_NOT_FOUND;
+
+    ULONG size = 0;
+    ULONG dep_flags = 0;
+    if (!SUCCEEDED(query_information_process(::GetCurrentProcess(),
+                                             ProcessExecuteFlags, &dep_flags,
+                                             sizeof(dep_flags), &size))) {
+      return SBOX_TEST_THIRD_ERROR;
+    }
+
+    static const int MEM_EXECUTE_OPTION_DISABLE = 2;
+    static const int MEM_EXECUTE_OPTION_PERMANENT = 8;
+    dep_flags &= 0xff;
+
+    if (dep_flags !=
+        (MEM_EXECUTE_OPTION_DISABLE | MEM_EXECUTE_OPTION_PERMANENT)) {
+      return SBOX_TEST_FOURTH_ERROR;
+    }
+  }
+
+  return SBOX_TEST_SUCCEEDED;
+}
+
+// ForceMsSigned tests:
+// Try to load the DLL given in arg1.
+SBOX_TESTS_COMMAND int TestDllLoad(int argc, wchar_t** argv) {
+  if (argc < 1 || argv[0] == nullptr)
+    return SBOX_TEST_INVALID_PARAMETER;
+
+  std::wstring dll = argv[0];
+  base::ScopedNativeLibrary test_dll((base::FilePath(dll)));
+  if (test_dll.is_valid())
+    return SBOX_TEST_SUCCEEDED;
+
+  // Note: GetLastError() does not get an accurate failure code
+  //       at this point.
+  return SBOX_TEST_FAILED;
+}
+
+// This test attempts a non-system font load.
+//
+// 1) Load gdi32.dll for required font APIs.
+// 2) Load file contents of font file passed in arg1 into memory.
+// 3) Call API to try loading a non-system font.
+//
+// Arg1: Full path to font file to try loading.
+SBOX_TESTS_COMMAND int CheckWin10FontLoad(int argc, wchar_t** argv) {
+  if (argc < 1)
+    return SBOX_TEST_INVALID_PARAMETER;
+
+  HMODULE gdi_module = ::LoadLibraryW(L"gdi32.dll");
+  if (!gdi_module)
+    return SBOX_TEST_NOT_FOUND;
+
+  AddFontMemResourceExFunction add_font_mem_resource =
+      reinterpret_cast<AddFontMemResourceExFunction>(
+          ::GetProcAddress(gdi_module, "AddFontMemResourceEx"));
+
+  RemoveFontMemResourceExFunction rem_font_mem_resource =
+      reinterpret_cast<RemoveFontMemResourceExFunction>(
+          ::GetProcAddress(gdi_module, "RemoveFontMemResourceEx"));
+
+  if (!add_font_mem_resource || !rem_font_mem_resource)
+    return SBOX_TEST_NOT_FOUND;
+
+  // Open font file passed in as an argument.
+  base::File file(base::FilePath(argv[0]),
+                  base::File::FLAG_OPEN | base::File::FLAG_READ);
+  if (!file.IsValid())
+    // Failed to open the font file passed in.
+    return SBOX_TEST_NOT_FOUND;
+
+  std::vector<char> font_data;
+  int64_t len = file.GetLength();
+  if (len < 0)
+    return SBOX_TEST_NOT_FOUND;
+  font_data.resize(len);
+
+  int read = file.Read(0, &font_data[0], len);
+  file.Close();
+
+  if (read != len)
+    return SBOX_TEST_NOT_FOUND;
+
+  DWORD font_count = 0;
+  HANDLE font_handle = add_font_mem_resource(
+      &font_data[0], static_cast<DWORD>(font_data.size()), NULL, &font_count);
+
+  if (font_handle) {
+    rem_font_mem_resource(font_handle);
+    return SBOX_TEST_SUCCEEDED;
+  }
+
+  return SBOX_TEST_FAILED;
+}
+
+// Common helper test for CreateProcess.
+// Arg1: The process commandline to create.
+// Arg2: Will process end on its own:
+//  - "true" for a process expected to finish on its own (wait for it).
+//  - "false" for a process that will require terminating.
+// Arg3: [OPTIONAL] Expected or forced exit code:
+//  - If arg2 is "true", this is the expected exit code (default 0).
+//  - If arg2 is "false", terminate the process with this exit code (default 0).
+//
+// ***Make sure you've enabled basic process creation in the
+// test sandbox settings via:
+// sandbox::TargetPolicy::SetJobLevel(),
+// sandbox::TargetPolicy::SetTokenLevel(),
+// and TestRunner::SetDisableCsrss().
+SBOX_TESTS_COMMAND int TestChildProcess(int argc, wchar_t** argv) {
+  if (argc < 2 || argc > 3)
+    return SBOX_TEST_INVALID_PARAMETER;
+
+  bool process_finishes = true;
+  std::wstring arg2 = argv[1];
+  if (arg2.compare(L"false") == 0)
+    process_finishes = false;
+
+  int desired_exit_code = 0;
+  if (argc == 3) {
+    desired_exit_code = wcstoul(argv[2], nullptr, 0);
+  }
+
+  std::wstring cmd = argv[0];
+  base::LaunchOptions options = base::LaunchOptionsForTest();
+  base::Process setup_proc = base::LaunchProcess(cmd.c_str(), options);
+
+  if (setup_proc.IsValid()) {
+    if (process_finishes) {
+      // Wait for process exit and compare exit code.
+      int exit_code = 1;
+      if (!setup_proc.WaitForExitWithTimeout(TestTimeouts::action_max_timeout(),
+                                             &exit_code)) {
+        // Unexpected failure.
+        setup_proc.Terminate(0, false);
+        return SBOX_TEST_TIMED_OUT;
+      }
+      if (exit_code != desired_exit_code)
+        return SBOX_TEST_FAILED;
+      return SBOX_TEST_SUCCEEDED;
+    } else {
+      // Terminate process with requested exit code.
+      setup_proc.Terminate(desired_exit_code, false);
+      return SBOX_TEST_SUCCEEDED;
+    }
+  }
+  // Process failed to be created.
+  // Note: GetLastError from CreateProcess returns 5, "ERROR_ACCESS_DENIED".
+  return SBOX_TEST_FAILED;
+}
+
+//------------------------------------------------------------------------------
+// Exported Mitigation Tests
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// DEP (MITIGATION_DEP and MITIGATION_DEP_NO_ATL_THUNK)
+// Win7 x86
+//------------------------------------------------------------------------------
+
+#if !defined(_WIN64)
+// DEP is always enabled on 64-bit.  Only test on x86.
+TEST(ProcessMitigationsTest, CheckDepWin7) {
+  if (base::win::GetVersion() > base::win::VERSION_WIN7)
+    return;
+
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  EXPECT_EQ(policy->SetProcessMitigations(MITIGATION_DEP |
+                                          MITIGATION_DEP_NO_ATL_THUNK |
+                                          MITIGATION_SEHOP),
+            SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(L"CheckDep"));
+}
+#endif  // !defined(_WIN64)
+
+//------------------------------------------------------------------------------
+// DEP (MITIGATION_DEP and MITIGATION_DEP_NO_ATL_THUNK)
+// >= Win8 x86
+//------------------------------------------------------------------------------
+
+#if !defined(_WIN64)
+// DEP is always enabled on 64-bit.  Only test on x86.
+
+// This test validates that setting the MITIGATION_DEP*
+// mitigations enables the setting on a process.
+TEST(ProcessMitigationsTest, CheckDepWin8PolicySuccess) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN8)
+    return;
+
+  std::wstring test_command = L"CheckPolicy ";
+  test_command += std::to_wstring(TESTPOLICY_DEP);
+
+  //---------------------------------
+  // 1) Test setting pre-startup.
+  //---------------------------------
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  EXPECT_EQ(policy->SetProcessMitigations(MITIGATION_DEP |
+                                          MITIGATION_DEP_NO_ATL_THUNK),
+            SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+
+  //---------------------------------
+  // 2) Test setting post-startup.
+  //---------------------------------
+  TestRunner runner2;
+  sandbox::TargetPolicy* policy2 = runner2.GetPolicy();
+
+  EXPECT_EQ(policy2->SetDelayedProcessMitigations(MITIGATION_DEP |
+                                                  MITIGATION_DEP_NO_ATL_THUNK),
+            SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner2.RunTest(test_command.c_str()));
+}
+
+#endif  // !defined(_WIN64)
+
+//------------------------------------------------------------------------------
+// ASLR
+// - MITIGATION_RELOCATE_IMAGE
+// - MITIGATION_RELOCATE_IMAGE_REQUIRED
+// - MITIGATION_BOTTOM_UP_ASLR
+// - MITIGATION_HIGH_ENTROPY_ASLR
+// >= Win8
+//------------------------------------------------------------------------------
+
+TEST(ProcessMitigationsTest, CheckWin8AslrPolicySuccess) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN8)
+    return;
+
+  std::wstring test_command = L"CheckPolicy ";
+  test_command += std::to_wstring(TESTPOLICY_ASLR);
+
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+//---------------------------------
+// 1) Test setting pre-startup.
+//    **Can only set ASLR pre-startup in release build.
+//---------------------------------
+#if defined(NDEBUG)
+  EXPECT_EQ(policy->SetProcessMitigations(
+                MITIGATION_RELOCATE_IMAGE | MITIGATION_RELOCATE_IMAGE_REQUIRED |
+                MITIGATION_BOTTOM_UP_ASLR | MITIGATION_HIGH_ENTROPY_ASLR),
+            SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+
+//---------------------------------
+// 2) Test setting post-startup.
+//    **Bottom up and high entropy can only be set pre-startup.
+//    **Can only set ASLR post-startup in debug build.
+//---------------------------------
+#else
+  EXPECT_EQ(policy->SetDelayedProcessMitigations(
+                MITIGATION_RELOCATE_IMAGE | MITIGATION_RELOCATE_IMAGE_REQUIRED),
+            SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+#endif  // !defined(NDEBUG)
+}
+
+//------------------------------------------------------------------------------
+//  Strict handle checks (MITIGATION_STRICT_HANDLE_CHECKS)
+// >= Win8
+//------------------------------------------------------------------------------
+
+TEST(ProcessMitigationsTest, CheckWin8StrictHandlePolicySuccess) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN8)
+    return;
+
+  std::wstring test_command = L"CheckPolicy ";
+  test_command += std::to_wstring(TESTPOLICY_STRICTHANDLE);
+
+  //---------------------------------
+  // 1) Test setting post-startup.
+  // ** Can only be set post-startup.
+  //---------------------------------
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  EXPECT_EQ(
+      policy->SetDelayedProcessMitigations(MITIGATION_STRICT_HANDLE_CHECKS),
+      SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+}
+
+//------------------------------------------------------------------------------
+// Disable non-system font loads (MITIGATION_NONSYSTEM_FONT_DISABLE)
+// >= Win10
+//------------------------------------------------------------------------------
+
+// This test validates that setting the MITIGATION_NON_SYSTEM_FONTS_DISABLE
+// mitigation enables the setting on a process.
+TEST(ProcessMitigationsTest, CheckWin10NonSystemFontLockDownPolicySuccess) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN10)
+    return;
+
+  std::wstring test_command = L"CheckPolicy ";
+  test_command += std::to_wstring(TESTPOLICY_NONSYSFONT);
+
+  //---------------------------------
+  // 1) Test setting pre-startup.
+  //---------------------------------
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  EXPECT_EQ(policy->SetProcessMitigations(MITIGATION_NONSYSTEM_FONT_DISABLE),
+            SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+
+  //---------------------------------
+  // 2) Test setting post-startup.
+  //---------------------------------
+  TestRunner runner2;
+  sandbox::TargetPolicy* policy2 = runner2.GetPolicy();
+
+  EXPECT_EQ(
+      policy2->SetDelayedProcessMitigations(MITIGATION_NONSYSTEM_FONT_DISABLE),
+      SBOX_ALL_OK);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner2.RunTest(test_command.c_str()));
+}
+
+// This test validates that we can load a non-system font if the
+// MITIGATION_NON_SYSTEM_FONTS_DISABLE mitigation is NOT set.
+TEST(ProcessMitigationsTest, CheckWin10NonSystemFontLockDownLoadSuccess) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN10)
+    return;
+
+  TestWin10NonSystemFont(true);
+}
+
+// This test validates that setting the MITIGATION_NON_SYSTEM_FONTS_DISABLE
+// mitigation prevents the loading of a non-system font.
+TEST(ProcessMitigationsTest, CheckWin10NonSystemFontLockDownLoadFailure) {
+  if (base::win::GetVersion() < base::win::VERSION_WIN10)
+    return;
+
+  TestWin10NonSystemFont(false);
+}
+
+//------------------------------------------------------------------------------
+// Disable child process creation.
+// - JobLevel <= JOB_LIMITED_USER (on < WIN10_TH2).
+// - JobLevel <= JOB_LIMITED_USER which also triggers setting
+//   PROC_THREAD_ATTRIBUTE_CHILD_PROCESS_POLICY to
+//   PROCESS_CREATION_CHILD_PROCESS_RESTRICTED in
+//   BrokerServicesBase::SpawnTarget (on >= WIN10_TH2).
+//------------------------------------------------------------------------------
+
+// This test validates that we can spawn a child process if
+// MITIGATION_CHILD_PROCESS_CREATION_RESTRICTED mitigation is
+// not set.
+TEST(ProcessMitigationsTest, CheckChildProcessSuccess) {
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  // Set a policy that would normally allow for process creation.
+  policy->SetJobLevel(JOB_INTERACTIVE, 0);
+  policy->SetTokenLevel(USER_UNPROTECTED, USER_UNPROTECTED);
+  runner.SetDisableCsrss(false);
+
+  base::FilePath cmd;
+  EXPECT_TRUE(base::PathService::Get(base::DIR_SYSTEM, &cmd));
+  cmd = cmd.Append(L"calc.exe");
+
+  std::wstring test_command = L"TestChildProcess \"";
+  test_command += cmd.value().c_str();
+  test_command += L"\" false";
+
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+}
+
+// This test validates that setting the
+// MITIGATION_CHILD_PROCESS_CREATION_RESTRICTED mitigation prevents
+// the spawning of child processes.
+TEST(ProcessMitigationsTest, CheckChildProcessFailure) {
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  // Now set the job level to be <= JOB_LIMITED_USER
+  // and ensure we can no longer create a child process.
+  policy->SetJobLevel(JOB_LIMITED_USER, 0);
+  policy->SetTokenLevel(USER_UNPROTECTED, USER_UNPROTECTED);
+  runner.SetDisableCsrss(false);
+
+  base::FilePath cmd;
+  EXPECT_TRUE(base::PathService::Get(base::DIR_SYSTEM, &cmd));
+  cmd = cmd.Append(L"calc.exe");
+
+  std::wstring test_command = L"TestChildProcess \"";
+  test_command += cmd.value().c_str();
+  test_command += L"\" false";
+
+  EXPECT_EQ(SBOX_TEST_FAILED, runner.RunTest(test_command.c_str()));
+}
+
+// This test validates that when the sandboxed target within a job spawns a
+// child process and the target process exits abnormally, the broker correctly
+// handles the JOB_OBJECT_MSG_ABNORMAL_EXIT_PROCESS message.
+// Because this involves spawning a child process from the target process and is
+// very similar to the above CheckChildProcess* tests, this test is here rather
+// than elsewhere closer to the other Job tests.
+TEST(ProcessMitigationsTest, CheckChildProcessAbnormalExit) {
+  TestRunner runner;
+  sandbox::TargetPolicy* policy = runner.GetPolicy();
+
+  // Set a policy that would normally allow for process creation.
+  policy->SetJobLevel(JOB_INTERACTIVE, 0);
+  policy->SetTokenLevel(USER_UNPROTECTED, USER_UNPROTECTED);
+  runner.SetDisableCsrss(false);
+
+  base::FilePath cmd;
+  EXPECT_TRUE(base::PathService::Get(base::DIR_SYSTEM, &cmd));
+  cmd = cmd.Append(L"calc.exe");
+
+  std::wstring test_command = L"TestChildProcess \"";
+  test_command += cmd.value().c_str();
+  test_command += L"\" false ";
+  test_command += std::to_wstring(STATUS_ACCESS_VIOLATION);
+
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
+}
+
+}  // namespace sandbox