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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/com_init_check_hook.h"
#include <objbase.h>
#include <shlobj.h>
#include <wrl/client.h>
#include "base/test/gtest_util.h"
#include "base/win/com_init_util.h"
#include "base/win/patch_util.h"
#include "base/win/scoped_com_initializer.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace win {
using Microsoft::WRL::ComPtr;
TEST(ComInitCheckHook, AssertNotInitialized) {
ComInitCheckHook com_check_hook;
AssertComApartmentType(ComApartmentType::NONE);
ComPtr<IUnknown> shell_link;
#if defined(COM_INIT_CHECK_HOOK_ENABLED)
EXPECT_NOTREACHED_DEATH(::CoCreateInstance(
CLSID_ShellLink, nullptr, CLSCTX_ALL, IID_PPV_ARGS(&shell_link)));
#else
EXPECT_EQ(CO_E_NOTINITIALIZED,
::CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_ALL,
IID_PPV_ARGS(&shell_link)));
#endif
}
TEST(ComInitCheckHook, HookRemoval) {
AssertComApartmentType(ComApartmentType::NONE);
{ ComInitCheckHook com_check_hook; }
ComPtr<IUnknown> shell_link;
EXPECT_EQ(CO_E_NOTINITIALIZED,
::CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_ALL,
IID_PPV_ARGS(&shell_link)));
}
TEST(ComInitCheckHook, NoAssertComInitialized) {
ComInitCheckHook com_check_hook;
ScopedCOMInitializer com_initializer;
ComPtr<IUnknown> shell_link;
EXPECT_TRUE(SUCCEEDED(::CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_ALL,
IID_PPV_ARGS(&shell_link))));
}
TEST(ComInitCheckHook, MultipleHooks) {
ComInitCheckHook com_check_hook_1;
ComInitCheckHook com_check_hook_2;
AssertComApartmentType(ComApartmentType::NONE);
ComPtr<IUnknown> shell_link;
#if defined(COM_INIT_CHECK_HOOK_ENABLED)
EXPECT_NOTREACHED_DEATH(::CoCreateInstance(
CLSID_ShellLink, nullptr, CLSCTX_ALL, IID_PPV_ARGS(&shell_link)));
#else
EXPECT_EQ(CO_E_NOTINITIALIZED,
::CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_ALL,
IID_PPV_ARGS(&shell_link)));
#endif
}
TEST(ComInitCheckHook, UnexpectedHook) {
#if defined(COM_INIT_CHECK_HOOK_ENABLED)
HMODULE ole32_library = ::LoadLibrary(L"ole32.dll");
ASSERT_TRUE(ole32_library);
uint32_t co_create_instance_padded_address =
reinterpret_cast<uint32_t>(
GetProcAddress(ole32_library, "CoCreateInstance")) -
5;
const unsigned char* co_create_instance_bytes =
reinterpret_cast<const unsigned char*>(co_create_instance_padded_address);
const unsigned char original_byte = co_create_instance_bytes[0];
const unsigned char unexpected_byte = 0xdb;
ASSERT_EQ(static_cast<DWORD>(NO_ERROR),
internal::ModifyCode(
reinterpret_cast<void*>(co_create_instance_padded_address),
reinterpret_cast<const void*>(&unexpected_byte),
sizeof(unexpected_byte)));
EXPECT_NOTREACHED_DEATH({ ComInitCheckHook com_check_hook; });
// If this call fails, really bad things are going to happen to other tests
// so CHECK here.
CHECK_EQ(static_cast<DWORD>(NO_ERROR),
internal::ModifyCode(
reinterpret_cast<void*>(co_create_instance_padded_address),
reinterpret_cast<const void*>(&original_byte),
sizeof(original_byte)));
::FreeLibrary(ole32_library);
ole32_library = nullptr;
#endif
}
TEST(ComInitCheckHook, ExternallyHooked) {
#if defined(COM_INIT_CHECK_HOOK_ENABLED)
HMODULE ole32_library = ::LoadLibrary(L"ole32.dll");
ASSERT_TRUE(ole32_library);
uint32_t co_create_instance_address = reinterpret_cast<uint32_t>(
GetProcAddress(ole32_library, "CoCreateInstance"));
const unsigned char* co_create_instance_bytes =
reinterpret_cast<const unsigned char*>(co_create_instance_address);
const unsigned char original_byte = co_create_instance_bytes[0];
const unsigned char jmp_byte = 0xe9;
ASSERT_EQ(static_cast<DWORD>(NO_ERROR),
internal::ModifyCode(
reinterpret_cast<void*>(co_create_instance_address),
reinterpret_cast<const void*>(&jmp_byte), sizeof(jmp_byte)));
// Externally patched instances should crash so we catch these cases on bots.
EXPECT_NOTREACHED_DEATH({ ComInitCheckHook com_check_hook; });
// If this call fails, really bad things are going to happen to other tests
// so CHECK here.
CHECK_EQ(
static_cast<DWORD>(NO_ERROR),
internal::ModifyCode(reinterpret_cast<void*>(co_create_instance_address),
reinterpret_cast<const void*>(&original_byte),
sizeof(original_byte)));
::FreeLibrary(ole32_library);
ole32_library = nullptr;
#endif
}
TEST(ComInitCheckHook, UnexpectedChangeDuringHook) {
#if defined(COM_INIT_CHECK_HOOK_ENABLED)
HMODULE ole32_library = ::LoadLibrary(L"ole32.dll");
ASSERT_TRUE(ole32_library);
uint32_t co_create_instance_padded_address =
reinterpret_cast<uint32_t>(
GetProcAddress(ole32_library, "CoCreateInstance")) -
5;
const unsigned char* co_create_instance_bytes =
reinterpret_cast<const unsigned char*>(co_create_instance_padded_address);
const unsigned char original_byte = co_create_instance_bytes[0];
const unsigned char unexpected_byte = 0xdb;
ASSERT_EQ(static_cast<DWORD>(NO_ERROR),
internal::ModifyCode(
reinterpret_cast<void*>(co_create_instance_padded_address),
reinterpret_cast<const void*>(&unexpected_byte),
sizeof(unexpected_byte)));
EXPECT_NOTREACHED_DEATH({
ComInitCheckHook com_check_hook;
internal::ModifyCode(
reinterpret_cast<void*>(co_create_instance_padded_address),
reinterpret_cast<const void*>(&unexpected_byte),
sizeof(unexpected_byte));
});
// If this call fails, really bad things are going to happen to other tests
// so CHECK here.
CHECK_EQ(static_cast<DWORD>(NO_ERROR),
internal::ModifyCode(
reinterpret_cast<void*>(co_create_instance_padded_address),
reinterpret_cast<const void*>(&original_byte),
sizeof(original_byte)));
::FreeLibrary(ole32_library);
ole32_library = nullptr;
#endif
}
} // namespace win
} // namespace base
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