Chrome browser process DLL blacklist.

chrome_elf/blacklist/test/blacklist_test.cc

Index: chrome_elf/blacklist/test/blacklist_test.cc
diff --git a/chrome_elf/blacklist/test/blacklist_test.cc b/chrome_elf/blacklist/test/blacklist_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b0b428b6723a8e7675ef51bb4d9aae71d34ce257
--- /dev/null
+++ b/chrome_elf/blacklist/test/blacklist_test.cc
@@ -0,0 +1,124 @@
+// Copyright 2013 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 "base/environment.h"
+#include "base/files/file_path.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/path_service.h"
+#include "base/scoped_native_library.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/test/test_reg_util_win.h"
+#include "chrome_elf/blacklist/blacklist.h"
+#include "chrome_elf/blacklist/test/blacklist_test_main_dll.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+const wchar_t kTestDllName1[] = L"blacklist_test_dll_1.dll";
+const wchar_t kTestDllName2[] = L"blacklist_test_dll_2.dll";
+const wchar_t kTestDllName3[] = L"blacklist_test_dll_3.dll";
+
+const wchar_t kDll2Beacon[] = L"{F70A0100-2889-4629-9B44-610FE5C73231}";
+const wchar_t kDll3Beacon[] = L"{9E056AEC-169E-400c-B2D0-5A07E3ACE2EB}";
+
+extern const wchar_t* kEnvVars[];
+
+extern "C" {
+// When modifying the blacklist in the test process, use the exported test dll
+// functions on the test blacklist dll, not the ones linked into the test
+// executable itself.
+__declspec(dllimport) void TestDll_AddDllToBlacklist(const wchar_t* dll_name);
+__declspec(dllimport) void TestDll_RemoveDllFromBlacklist(
+    const wchar_t* dll_name);
+}
+
+class BlacklistTest : public testing::Test {
+  virtual void SetUp() {
+    // Force an import from blacklist_test_main_dll.
+    InitBlacklistTestDll();
+
+    // Ensure that the beacon state starts off cleared.
+    blacklist::ClearBeacon();
+  }
+
+  virtual void TearDown() {
+    TestDll_RemoveDllFromBlacklist(kTestDllName1);
+    TestDll_RemoveDllFromBlacklist(kTestDllName2);
+  }
+};
+
+TEST_F(BlacklistTest, Beacon) {
+  registry_util::RegistryOverrideManager override_manager;
+  override_manager.OverrideRegistry(HKEY_CURRENT_USER, L"beacon_test");
+
+  // First call should succeed as the beacon is newly created.
+  EXPECT_TRUE(blacklist::CreateBeacon());
+
+  // Second call should fail indicating the beacon already existed.
+  EXPECT_FALSE(blacklist::CreateBeacon());
+
+  // First call should find the beacon and delete it.
+  EXPECT_TRUE(blacklist::ClearBeacon());
+
+  // Second call should fail to find the beacon and delete it.
+  EXPECT_FALSE(blacklist::ClearBeacon());
+}
+
+TEST_F(BlacklistTest, AddAndRemoveModules) {
+  EXPECT_TRUE(blacklist::AddDllToBlacklist(L"foo.dll"));
+  // Adding the same item twice should be idempotent.
+  EXPECT_TRUE(blacklist::AddDllToBlacklist(L"foo.dll"));
+  EXPECT_TRUE(blacklist::RemoveDllFromBlacklist(L"foo.dll"));
+  EXPECT_FALSE(blacklist::RemoveDllFromBlacklist(L"foo.dll"));
+
+  std::vector<string16> added_dlls;
+  added_dlls.reserve(blacklist::kTroublesomeDllsMaxCount);
+  for (int i = 0; i < blacklist::kTroublesomeDllsMaxCount; ++i) {
+    added_dlls.push_back(base::IntToString16(i) + L".dll");
+    EXPECT_TRUE(blacklist::AddDllToBlacklist(added_dlls[i].c_str())) << i;
+  }
+  EXPECT_FALSE(blacklist::AddDllToBlacklist(L"overflow.dll"));
+  for (int i = 0; i < blacklist::kTroublesomeDllsMaxCount; ++i) {
+    EXPECT_TRUE(blacklist::RemoveDllFromBlacklist(added_dlls[i].c_str())) << i;
+  }
+  EXPECT_FALSE(blacklist::RemoveDllFromBlacklist(L"0.dll"));
+  EXPECT_FALSE(blacklist::RemoveDllFromBlacklist(L"63.dll"));
+}
+
+TEST_F(BlacklistTest, LoadBlacklistedLibrary) {
+  base::FilePath current_dir;
+  ASSERT_TRUE(PathService::Get(base::DIR_EXE, &current_dir));
+
+  // Test that an un-blacklisted DLL can load correctly.
+  base::ScopedNativeLibrary dll1(current_dir.Append(kTestDllName1));
+  EXPECT_TRUE(dll1.is_valid());
+  dll1.Reset(NULL);
+
+  struct TestData {
+    const wchar_t* dll_name;
+    const wchar_t* dll_beacon;
+  } test_data[] = {
+    { kTestDllName2, kDll2Beacon },
+    { kTestDllName3, kDll3Beacon }
+  };
+  for (int i = 0 ; i < arraysize(test_data); ++i) {
+    // Add the DLL to the blacklist, ensure that it is not loaded both by
+    // inspecting the handle returned by LoadLibrary and by looking for an
+    // environment variable that is set when the DLL's entry point is called.
+    TestDll_AddDllToBlacklist(test_data[i].dll_name);
+    base::ScopedNativeLibrary dll_blacklisted(
+        current_dir.Append(test_data[i].dll_name));
+    EXPECT_FALSE(dll_blacklisted.is_valid());
+    EXPECT_EQ(0u, ::GetEnvironmentVariable(test_data[i].dll_beacon, NULL, 0));
+    dll_blacklisted.Reset(NULL);
+
+    // Remove the DLL from the blacklist. Ensure that it loads and that its
+    // entry point was called.
+    TestDll_RemoveDllFromBlacklist(test_data[i].dll_name);
+    base::ScopedNativeLibrary dll(current_dir.Append(test_data[i].dll_name));
+    EXPECT_TRUE(dll.is_valid());
+    EXPECT_NE(0u, ::GetEnvironmentVariable(test_data[i].dll_beacon, NULL, 0));
+    dll.Reset(NULL);
+  }
+}