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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.
// This file contains unit tests for ServiceResolverThunk.
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "sandbox/src/resolver.h"
#include "sandbox/src/sandbox_utils.h"
#include "sandbox/src/service_resolver.h"
#include "sandbox/src/wow64.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
// This is the concrete resolver used to perform service-call type functions
// inside ntdll.dll.
template<typename T>
class ResolverThunkTest : public T {
public:
// The service resolver needs a child process to write to.
explicit ResolverThunkTest(bool relaxed)
: T(::GetCurrentProcess(), relaxed) {}
// Sets the interception target to the desired address.
void set_target(void* target) {
fake_target_ = target;
}
protected:
// Overrides Resolver::Init
virtual NTSTATUS Init(const void* target_module,
const void* interceptor_module,
const char* target_name,
const char* interceptor_name,
const void* interceptor_entry_point,
void* thunk_storage,
size_t storage_bytes) {
NTSTATUS ret = STATUS_SUCCESS;
ret = ResolverThunk::Init(target_module, interceptor_module, target_name,
interceptor_name, interceptor_entry_point,
thunk_storage, storage_bytes);
EXPECT_EQ(STATUS_SUCCESS, ret);
target_ = fake_target_;
ntdll_base_ = ::GetModuleHandle(L"ntdll.dll");
return ret;
};
private:
// Holds the address of the fake target.
void* fake_target_;
DISALLOW_COPY_AND_ASSIGN(ResolverThunkTest);
};
typedef ResolverThunkTest<sandbox::Win2kResolverThunk> Win2kResolverTest;
typedef ResolverThunkTest<sandbox::ServiceResolverThunk> WinXpResolverTest;
typedef ResolverThunkTest<sandbox::Wow64ResolverThunk> Wow64ResolverTest;
NTSTATUS PatchNtdll(const char* function, bool relaxed) {
HMODULE ntdll_base = ::GetModuleHandle(L"ntdll.dll");
EXPECT_TRUE(NULL != ntdll_base);
void* target = ::GetProcAddress(ntdll_base, function);
EXPECT_TRUE(NULL != target);
if (NULL == target)
return STATUS_UNSUCCESSFUL;
char service[50];
memcpy(service, target, sizeof(service));
sandbox::Wow64 WowHelper(NULL, ntdll_base);
sandbox::ServiceResolverThunk* resolver;
if (WowHelper.IsWow64())
resolver = new Wow64ResolverTest(relaxed);
else if (!sandbox::IsXPSP2OrLater())
resolver = new Win2kResolverTest(relaxed);
else
resolver = new WinXpResolverTest(relaxed);
static_cast<WinXpResolverTest*>(resolver)->set_target(service);
// Any pointer will do as an interception_entry_point
void* function_entry = resolver;
size_t thunk_size = resolver->GetThunkSize();
scoped_array<char> thunk(new char[thunk_size]);
size_t used;
NTSTATUS ret = resolver->Setup(ntdll_base, NULL, function, NULL,
function_entry, thunk.get(), thunk_size,
&used);
if (NT_SUCCESS(ret)) {
EXPECT_EQ(thunk_size, used);
EXPECT_NE(0, memcmp(service, target, sizeof(service)));
if (relaxed) {
// It's already patched, let's patch again.
ret = resolver->Setup(ntdll_base, NULL, function, NULL, function_entry,
thunk.get(), thunk_size, &used);
}
}
delete resolver;
return ret;
}
TEST(ServiceResolverTest, PatchesServices) {
NTSTATUS ret = PatchNtdll("NtClose", false);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtClose, last error: " << ::GetLastError();
ret = PatchNtdll("NtCreateFile", false);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateFile, last error: " <<
::GetLastError();
ret = PatchNtdll("NtCreateMutant", false);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateMutant, last error: " <<
::GetLastError();
ret = PatchNtdll("NtMapViewOfSection", false);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtMapViewOfSection, last error: " <<
::GetLastError();
}
TEST(ServiceResolverTest, FailsIfNotService) {
#if !defined(_WIN64)
EXPECT_NE(STATUS_SUCCESS, PatchNtdll("RtlUlongByteSwap", false));
#endif
EXPECT_NE(STATUS_SUCCESS, PatchNtdll("LdrLoadDll", false));
}
TEST(ServiceResolverTest, PatchesPatchedServices) {
// We don't support "relaxed mode" for Win64 apps.
#if !defined(_WIN64)
NTSTATUS ret = PatchNtdll("NtClose", true);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtClose, last error: " << ::GetLastError();
ret = PatchNtdll("NtCreateFile", true);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateFile, last error: " <<
::GetLastError();
ret = PatchNtdll("NtCreateMutant", true);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateMutant, last error: " <<
::GetLastError();
ret = PatchNtdll("NtMapViewOfSection", true);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtMapViewOfSection, last error: " <<
::GetLastError();
#endif
}
} // namespace
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