1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
// Copyright (c) 2012 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/memory/scoped_ptr.h"
#include "base/win/windows_version.h"
#include "sandbox/win/src/resolver.h"
#include "sandbox/win/src/sandbox_utils.h"
#include "sandbox/win/src/service_resolver.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::ServiceResolverThunk> WinXpResolverTest;
#if !defined(_WIN64)
typedef ResolverThunkTest<sandbox::Win2kResolverThunk> Win2kResolverTest;
typedef ResolverThunkTest<sandbox::Win8ResolverThunk> Win8ResolverTest;
typedef ResolverThunkTest<sandbox::Wow64ResolverThunk> Wow64ResolverTest;
typedef ResolverThunkTest<sandbox::Wow64W8ResolverThunk> Wow64W8ResolverTest;
#endif
const BYTE kJump32 = 0xE9;
void CheckJump(void* source, void* target) {
#pragma pack(push)
#pragma pack(1)
struct Code {
BYTE jump;
ULONG delta;
};
#pragma pack(pop)
#if defined(_WIN64)
FAIL() << "Running 32-bit codepath";
#else
Code* patched = reinterpret_cast<Code*>(source);
EXPECT_EQ(kJump32, patched->jump);
ULONG source_addr = bit_cast<ULONG>(source);
ULONG target_addr = bit_cast<ULONG>(target);
EXPECT_EQ(target_addr + 19 - source_addr, patched->delta);
#endif
}
NTSTATUS PatchNtdllWithResolver(const char* function, bool relaxed,
sandbox::ServiceResolverThunk* resolver) {
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;
BYTE service[50];
memcpy(service, target, sizeof(service));
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)));
EXPECT_NE(kJump32, service[0]);
if (relaxed) {
// It's already patched, let's patch again, and simulate a direct patch.
service[0] = kJump32;
ret = resolver->Setup(ntdll_base, NULL, function, NULL, function_entry,
thunk.get(), thunk_size, &used);
CheckJump(service, thunk.get());
}
}
return ret;
}
sandbox::ServiceResolverThunk* GetTestResolver(bool relaxed) {
#if defined(_WIN64)
return new WinXpResolverTest(relaxed);
#else
base::win::OSInfo* os_info = base::win::OSInfo::GetInstance();
if (os_info->wow64_status() == base::win::OSInfo::WOW64_ENABLED) {
if (os_info->version() >= base::win::VERSION_WIN8)
return new Wow64W8ResolverTest(relaxed);
return new Wow64ResolverTest(relaxed);
}
if (!sandbox::IsXPSP2OrLater())
return new Win2kResolverTest(relaxed);
if (os_info->version() >= base::win::VERSION_WIN8)
return new Win8ResolverTest(relaxed);
return new WinXpResolverTest(relaxed);
#endif
}
NTSTATUS PatchNtdll(const char* function, bool relaxed) {
sandbox::ServiceResolverThunk* resolver = GetTestResolver(relaxed);
NTSTATUS ret = PatchNtdllWithResolver(function, relaxed, resolver);
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
}
TEST(ServiceResolverTest, MultiplePatchedServices) {
// We don't support "relaxed mode" for Win64 apps.
#if !defined(_WIN64)
sandbox::ServiceResolverThunk* resolver = GetTestResolver(true);
NTSTATUS ret = PatchNtdllWithResolver("NtClose", true, resolver);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtClose, last error: " << ::GetLastError();
ret = PatchNtdllWithResolver("NtCreateFile", true, resolver);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateFile, last error: " <<
::GetLastError();
ret = PatchNtdllWithResolver("NtCreateMutant", true, resolver);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateMutant, last error: " <<
::GetLastError();
ret = PatchNtdllWithResolver("NtMapViewOfSection", true, resolver);
EXPECT_EQ(STATUS_SUCCESS, ret) << "NtMapViewOfSection, last error: " <<
::GetLastError();
delete resolver;
#endif
}
} // namespace
|
