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// 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/i18n/case_conversion.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 "base/win/registry.h"
#include "chrome_elf/blacklist/blacklist.h"
#include "chrome_elf/blacklist/test/blacklist_test_main_dll.h"
#include "chrome_elf/chrome_elf_constants.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "version.h" // NOLINT
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_AddDllsFromRegistryToBlacklist();
__declspec(dllimport) bool TestDll_AddDllToBlacklist(const wchar_t* dll_name);
__declspec(dllimport) bool TestDll_IsBlacklistInitialized();
__declspec(dllimport) bool TestDll_RemoveDllFromBlacklist(
const wchar_t* dll_name);
__declspec(dllimport) bool TestDll_SuccessfullyBlocked(
const wchar_t** blocked_dlls,
int* size);
}
namespace {
class BlacklistTest : public testing::Test {
protected:
BlacklistTest() : override_manager_() {
override_manager_.OverrideRegistry(HKEY_CURRENT_USER);
}
scoped_ptr<base::win::RegKey> blacklist_registry_key_;
registry_util::RegistryOverrideManager override_manager_;
private:
virtual void SetUp() {
// Force an import from blacklist_test_main_dll.
InitBlacklistTestDll();
blacklist_registry_key_.reset(
new base::win::RegKey(HKEY_CURRENT_USER,
blacklist::kRegistryBeaconPath,
KEY_QUERY_VALUE | KEY_SET_VALUE));
}
virtual void TearDown() {
TestDll_RemoveDllFromBlacklist(kTestDllName1);
TestDll_RemoveDllFromBlacklist(kTestDllName2);
TestDll_RemoveDllFromBlacklist(kTestDllName3);
}
};
struct TestData {
const wchar_t* dll_name;
const wchar_t* dll_beacon;
} test_data[] = {
{kTestDllName2, kDll2Beacon},
#if !defined(_WIN64)
// The third test dll is special in that it does not contain an export
// table. This prevents SafeGetImageInfo from extracting the name from there
// AND for some reason NtQueryVirtualMemory with MemorySectionName returns
// STATUS_ACCESS_VIOLATION in 64 bit builds for reasons still unknown.
// http://crbug.com/397137
{kTestDllName3, kDll3Beacon}
#endif
};
TEST_F(BlacklistTest, Beacon) {
// Ensure that the beacon state starts off 'running' for this version.
LONG result = blacklist_registry_key_->WriteValue(
blacklist::kBeaconState, blacklist::BLACKLIST_SETUP_RUNNING);
EXPECT_EQ(ERROR_SUCCESS, result);
result = blacklist_registry_key_->WriteValue(blacklist::kBeaconVersion,
TEXT(CHROME_VERSION_STRING));
EXPECT_EQ(ERROR_SUCCESS, result);
// First call should find the beacon and reset it.
EXPECT_TRUE(blacklist::ResetBeacon());
// First call should succeed as the beacon is enabled.
EXPECT_TRUE(blacklist::LeaveSetupBeacon());
}
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"));
// Increase the blacklist size by 1 to include the NULL pointer
// that marks the end.
int empty_spaces = blacklist::kTroublesomeDllsMaxCount - (
blacklist::BlacklistSize() + 1);
std::vector<base::string16> added_dlls;
added_dlls.reserve(empty_spaces);
for (int i = 0; i < empty_spaces; ++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 < empty_spaces; ++i) {
EXPECT_TRUE(blacklist::RemoveDllFromBlacklist(added_dlls[i].c_str())) << i;
}
EXPECT_FALSE(blacklist::RemoveDllFromBlacklist(added_dlls[0].c_str()));
EXPECT_FALSE(blacklist::RemoveDllFromBlacklist(
added_dlls[empty_spaces - 1].c_str()));
}
TEST_F(BlacklistTest, SuccessfullyBlocked) {
// Ensure that we have at least 5 dlls to blacklist.
int blacklist_size = blacklist::BlacklistSize();
const int kDesiredBlacklistSize = 5;
for (int i = blacklist_size; i < kDesiredBlacklistSize; ++i) {
base::string16 new_dll_name(base::IntToString16(i) + L".dll");
EXPECT_TRUE(blacklist::AddDllToBlacklist(new_dll_name.c_str()));
}
// Block 5 dlls, one at a time, starting from the end of the list, and
// ensuring SuccesfullyBlocked correctly passes the list of blocked dlls.
for (int i = 0; i < kDesiredBlacklistSize; ++i) {
blacklist::BlockedDll(i);
int size = 0;
blacklist::SuccessfullyBlocked(NULL, &size);
EXPECT_EQ(i + 1, size);
std::vector<const wchar_t*> blocked_dlls(size);
blacklist::SuccessfullyBlocked(&(blocked_dlls[0]), &size);
EXPECT_EQ(i + 1, size);
for (size_t j = 0; j < blocked_dlls.size(); ++j) {
EXPECT_EQ(blocked_dlls[j], blacklist::g_troublesome_dlls[j]);
}
}
}
void CheckBlacklistedDllsNotLoaded() {
base::FilePath current_dir;
ASSERT_TRUE(PathService::Get(base::DIR_EXE, &current_dir));
for (int i = 0; i < arraysize(test_data); ++i) {
// Ensure that the dll has not been 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.
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);
// Ensure that the dll is recorded as blocked.
int array_size = 1;
const wchar_t* blocked_dll = NULL;
TestDll_SuccessfullyBlocked(&blocked_dll, &array_size);
EXPECT_EQ(1, array_size);
EXPECT_EQ(test_data[i].dll_name, base::string16(blocked_dll));
// Remove the DLL from the blacklist. Ensure that it loads and that its
// entry point was called.
EXPECT_TRUE(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);
::SetEnvironmentVariable(test_data[i].dll_beacon, NULL);
// Ensure that the dll won't load even if the name has different
// capitalization.
base::string16 uppercase_name = base::i18n::ToUpper(test_data[i].dll_name);
EXPECT_TRUE(TestDll_AddDllToBlacklist(uppercase_name.c_str()));
base::ScopedNativeLibrary dll_blacklisted_different_case(
current_dir.Append(test_data[i].dll_name));
EXPECT_FALSE(dll_blacklisted_different_case.is_valid());
EXPECT_EQ(0u, ::GetEnvironmentVariable(test_data[i].dll_beacon, NULL, 0));
dll_blacklisted_different_case.Reset(NULL);
EXPECT_TRUE(TestDll_RemoveDllFromBlacklist(uppercase_name.c_str()));
// The blocked dll was removed, so we shouldn't get anything returned
// here.
int num_blocked_dlls = 0;
TestDll_SuccessfullyBlocked(NULL, &num_blocked_dlls);
EXPECT_EQ(0, num_blocked_dlls);
}
}
TEST_F(BlacklistTest, LoadBlacklistedLibrary) {
base::FilePath current_dir;
ASSERT_TRUE(PathService::Get(base::DIR_EXE, &current_dir));
// Ensure that the blacklist is loaded.
ASSERT_TRUE(TestDll_IsBlacklistInitialized());
// Test that an un-blacklisted DLL can load correctly.
base::ScopedNativeLibrary dll1(current_dir.Append(kTestDllName1));
EXPECT_TRUE(dll1.is_valid());
dll1.Reset(NULL);
int num_blocked_dlls = 0;
TestDll_SuccessfullyBlocked(NULL, &num_blocked_dlls);
EXPECT_EQ(0, num_blocked_dlls);
// Add all DLLs to the blacklist then check they are blocked.
for (int i = 0; i < arraysize(test_data); ++i) {
EXPECT_TRUE(TestDll_AddDllToBlacklist(test_data[i].dll_name));
}
CheckBlacklistedDllsNotLoaded();
}
TEST_F(BlacklistTest, AddDllsFromRegistryToBlacklist) {
// Ensure that the blacklist is loaded.
ASSERT_TRUE(TestDll_IsBlacklistInitialized());
// Delete the finch registry key to clear its values.
base::win::RegKey key(HKEY_CURRENT_USER,
blacklist::kRegistryFinchListPath,
KEY_QUERY_VALUE | KEY_SET_VALUE);
key.DeleteKey(L"");
// Add the test dlls to the registry (with their name as both key and value).
base::win::RegKey finch_blacklist_registry_key(
HKEY_CURRENT_USER,
blacklist::kRegistryFinchListPath,
KEY_QUERY_VALUE | KEY_SET_VALUE);
for (int i = 0; i < arraysize(test_data); ++i) {
finch_blacklist_registry_key.WriteValue(test_data[i].dll_name,
test_data[i].dll_name);
}
TestDll_AddDllsFromRegistryToBlacklist();
CheckBlacklistedDllsNotLoaded();
}
void TestResetBeacon(scoped_ptr<base::win::RegKey>& key,
DWORD input_state,
DWORD expected_output_state) {
LONG result = key->WriteValue(blacklist::kBeaconState, input_state);
EXPECT_EQ(ERROR_SUCCESS, result);
EXPECT_TRUE(blacklist::ResetBeacon());
DWORD blacklist_state = blacklist::BLACKLIST_STATE_MAX;
result = key->ReadValueDW(blacklist::kBeaconState, &blacklist_state);
EXPECT_EQ(ERROR_SUCCESS, result);
EXPECT_EQ(expected_output_state, blacklist_state);
}
TEST_F(BlacklistTest, ResetBeacon) {
// Ensure that ResetBeacon resets properly on successful runs and not on
// failed or disabled runs.
TestResetBeacon(blacklist_registry_key_,
blacklist::BLACKLIST_SETUP_RUNNING,
blacklist::BLACKLIST_ENABLED);
TestResetBeacon(blacklist_registry_key_,
blacklist::BLACKLIST_SETUP_FAILED,
blacklist::BLACKLIST_SETUP_FAILED);
TestResetBeacon(blacklist_registry_key_,
blacklist::BLACKLIST_DISABLED,
blacklist::BLACKLIST_DISABLED);
}
TEST_F(BlacklistTest, SetupFailed) {
// Ensure that when the number of failed tries reaches the maximum allowed,
// the blacklist state is set to failed.
LONG result = blacklist_registry_key_->WriteValue(
blacklist::kBeaconState, blacklist::BLACKLIST_SETUP_RUNNING);
EXPECT_EQ(ERROR_SUCCESS, result);
// Set the attempt count so that on the next failure the blacklist is
// disabled.
result = blacklist_registry_key_->WriteValue(
blacklist::kBeaconAttemptCount, blacklist::kBeaconMaxAttempts - 1);
EXPECT_EQ(ERROR_SUCCESS, result);
EXPECT_FALSE(blacklist::LeaveSetupBeacon());
DWORD attempt_count = 0;
blacklist_registry_key_->ReadValueDW(blacklist::kBeaconAttemptCount,
&attempt_count);
EXPECT_EQ(attempt_count, blacklist::kBeaconMaxAttempts);
DWORD blacklist_state = blacklist::BLACKLIST_STATE_MAX;
result = blacklist_registry_key_->ReadValueDW(blacklist::kBeaconState,
&blacklist_state);
EXPECT_EQ(ERROR_SUCCESS, result);
EXPECT_EQ(blacklist_state, blacklist::BLACKLIST_SETUP_FAILED);
}
TEST_F(BlacklistTest, SetupSucceeded) {
// Starting with the enabled beacon should result in the setup running state
// and the attempt counter reset to zero.
LONG result = blacklist_registry_key_->WriteValue(
blacklist::kBeaconState, blacklist::BLACKLIST_ENABLED);
EXPECT_EQ(ERROR_SUCCESS, result);
result = blacklist_registry_key_->WriteValue(blacklist::kBeaconAttemptCount,
blacklist::kBeaconMaxAttempts);
EXPECT_EQ(ERROR_SUCCESS, result);
EXPECT_TRUE(blacklist::LeaveSetupBeacon());
DWORD blacklist_state = blacklist::BLACKLIST_STATE_MAX;
blacklist_registry_key_->ReadValueDW(blacklist::kBeaconState,
&blacklist_state);
EXPECT_EQ(blacklist_state, blacklist::BLACKLIST_SETUP_RUNNING);
DWORD attempt_count = blacklist::kBeaconMaxAttempts;
blacklist_registry_key_->ReadValueDW(blacklist::kBeaconAttemptCount,
&attempt_count);
EXPECT_EQ(static_cast<DWORD>(0), attempt_count);
}
} // namespace