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// Copyright (c) 2010 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 "chrome_frame/function_stub.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/gmock/include/gmock/gmock.h"
namespace {
// Test subclass to expose extra stuff.
class TestFunctionStub: public FunctionStub {
public:
static void Init(TestFunctionStub* stub) {
stub->FunctionStub::Init(&stub->stub_);
}
// Expose the offset to our signature_ field.
static const size_t kSignatureOffset;
void set_signature(HMODULE signature) { signature_ = signature; }
};
const size_t TestFunctionStub::kSignatureOffset =
FIELD_OFFSET(TestFunctionStub, signature_);
class FunctionStubTest: public testing::Test {
public:
FunctionStubTest() : stub_(NULL) {
}
virtual void SetUp() {
SYSTEM_INFO sys_info;
::GetSystemInfo(&sys_info);
// Playpen size is a system page.
playpen_size_ = sys_info.dwPageSize;
// Reserve two pages.
playpen_ = reinterpret_cast<uint8*>(
::VirtualAlloc(NULL,
2 * playpen_size_,
MEM_RESERVE,
PAGE_EXECUTE_READWRITE));
ASSERT_TRUE(playpen_ != NULL);
// And commit the first one.
ASSERT_TRUE(::VirtualAlloc(playpen_,
playpen_size_,
MEM_COMMIT,
PAGE_EXECUTE_READWRITE));
}
virtual void TearDown() {
if (stub_ != NULL) {
EXPECT_TRUE(FunctionStub::Destroy(stub_));
}
if (playpen_ != NULL) {
EXPECT_TRUE(::VirtualFree(playpen_, 0, MEM_RELEASE));
}
}
protected:
typedef uintptr_t (CALLBACK *FuncPtr0)();
typedef uintptr_t (CALLBACK *FuncPtr1)(uintptr_t arg);
MOCK_METHOD0(Foo0, uintptr_t());
MOCK_METHOD1(Foo1, uintptr_t(uintptr_t));
MOCK_METHOD0(Bar0, uintptr_t());
MOCK_METHOD1(Bar1, uintptr_t(uintptr_t));
static uintptr_t CALLBACK FooCallback0(FunctionStubTest* test) {
return test->Foo0();
}
static uintptr_t CALLBACK FooCallback1(FunctionStubTest* test,
uintptr_t arg) {
return test->Foo1(arg);
}
static uintptr_t CALLBACK BarCallback0(FunctionStubTest* test) {
return test->Foo0();
}
static uintptr_t CALLBACK BarCallback1(FunctionStubTest* test,
uintptr_t arg) {
return test->Foo1(arg);
}
// If a stub is allocated during testing, assigning it here
// will deallocate it at the end of test.
FunctionStub* stub_;
// playpen_[0 .. playpen_size_ - 1] is committed, writable memory.
// playpen_[playpen_size_] is uncommitted, defined memory.
uint8* playpen_;
size_t playpen_size_;
};
const uintptr_t kDivertedRetVal = 0x42;
const uintptr_t kFooRetVal = 0xCAFEBABE;
const uintptr_t kFooArg = 0xF0F0F0F0;
uintptr_t CALLBACK Foo() {
return kFooRetVal;
}
uintptr_t CALLBACK FooDivert(uintptr_t arg) {
return kFooRetVal;
}
} // namespace
TEST_F(FunctionStubTest, Accessors) {
uintptr_t argument = reinterpret_cast<uintptr_t>(this);
uintptr_t dest_fn = reinterpret_cast<uintptr_t>(FooDivert);
stub_ = FunctionStub::Create(argument, FooDivert);
EXPECT_FALSE(stub_->is_bypassed());
EXPECT_TRUE(stub_->is_valid());
EXPECT_TRUE(stub_->code() != NULL);
// Check that the stub code is executable.
MEMORY_BASIC_INFORMATION info = {};
EXPECT_NE(0u, ::VirtualQuery(stub_->code(), &info, sizeof(info)));
const DWORD kExecutableMask = PAGE_EXECUTE | PAGE_EXECUTE_READ |
PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY;
EXPECT_NE(0u, info.Protect & kExecutableMask);
EXPECT_EQ(argument, stub_->argument());
EXPECT_TRUE(stub_->bypass_address() != NULL);
EXPECT_EQ(dest_fn, stub_->destination_function());
}
TEST_F(FunctionStubTest, ZeroArgumentStub) {
stub_ = FunctionStub::Create(reinterpret_cast<uintptr_t>(this),
&FunctionStubTest::FooCallback0);
FuncPtr0 func = reinterpret_cast<FuncPtr0>(stub_->code());
EXPECT_CALL(*this, Foo0())
.WillOnce(testing::Return(kDivertedRetVal));
EXPECT_EQ(kDivertedRetVal, func());
}
TEST_F(FunctionStubTest, OneArgumentStub) {
stub_ = FunctionStub::Create(reinterpret_cast<uintptr_t>(this),
&FunctionStubTest::FooCallback1);
FuncPtr1 func = reinterpret_cast<FuncPtr1>(stub_->code());
EXPECT_CALL(*this, Foo1(kFooArg))
.WillOnce(testing::Return(kDivertedRetVal));
EXPECT_EQ(kDivertedRetVal, func(kFooArg));
}
TEST_F(FunctionStubTest, Bypass) {
stub_ = FunctionStub::Create(reinterpret_cast<uintptr_t>(this),
&FunctionStubTest::FooCallback0);
FuncPtr0 func = reinterpret_cast<FuncPtr0>(stub_->code());
EXPECT_CALL(*this, Foo0())
.WillOnce(testing::Return(kDivertedRetVal));
// This will call through to foo.
EXPECT_EQ(kDivertedRetVal, func());
// Now bypass to Foo().
stub_->BypassStub(Foo);
EXPECT_TRUE(stub_->is_bypassed());
EXPECT_FALSE(stub_->is_valid());
// We should not call through anymore.
EXPECT_CALL(*this, Foo0())
.Times(0);
EXPECT_EQ(kFooRetVal, func());
}
TEST_F(FunctionStubTest, FromCode) {
// We should get NULL and no crash from reserved memory.
EXPECT_EQ(NULL, FunctionStub::FromCode(playpen_ + playpen_size_));
// Create a FunctionStub pointer whose signature_
// field hangs just off the playpen.
TestFunctionStub* stub =
reinterpret_cast<TestFunctionStub*>(playpen_ + playpen_size_ -
TestFunctionStub::kSignatureOffset);
TestFunctionStub::Init(stub);
EXPECT_EQ(NULL, FunctionStub::FromCode(stub));
// Create a stub in committed memory.
stub = reinterpret_cast<TestFunctionStub*>(playpen_);
TestFunctionStub::Init(stub);
// Signature is NULL, which won't do.
EXPECT_EQ(NULL, FunctionStub::FromCode(stub));
const DWORD kFlags = GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT;
HMODULE my_module = NULL;
EXPECT_TRUE(::GetModuleHandleEx(kFlags,
reinterpret_cast<const wchar_t*>(&kDivertedRetVal),
&my_module));
// Set our module as signature.
stub->set_signature(my_module);
EXPECT_EQ(stub, FunctionStub::FromCode(stub));
}
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