sandbox/win/src/service_resolver_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file contains unit tests for ServiceResolverThunk.
   6
   7 #include "base/basictypes.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/win/windows_version.h"
  10 #include "sandbox/win/src/resolver.h"
  11 #include "sandbox/win/src/sandbox_utils.h"
  12 #include "sandbox/win/src/service_resolver.h"
  13 #include "testing/gtest/include/gtest/gtest.h"
  14
  15 namespace {
  16
  17 // This is the concrete resolver used to perform service-call type functions
  18 // inside ntdll.dll.
  19 template<typename T>
  20 class ResolverThunkTest : public T {
  21  public:
  22   // The service resolver needs a child process to write to.
  23   explicit ResolverThunkTest(bool relaxed)
  24       : T(::GetCurrentProcess(), relaxed) {}
  25
  26   // Sets the interception target to the desired address.
  27   void set_target(void* target) {
  28     fake_target_ = target;
  29   }
  30
  31  protected:
  32   // Overrides Resolver::Init
  33   virtual NTSTATUS Init(const void* target_module,
  34                         const void* interceptor_module,
  35                         const char* target_name,
  36                         const char* interceptor_name,
  37                         const void* interceptor_entry_point,
  38                         void* thunk_storage,
  39                         size_t storage_bytes) {
  40     NTSTATUS ret = STATUS_SUCCESS;
  41     ret = T::Init(target_module, interceptor_module, target_name,
  42                   interceptor_name, interceptor_entry_point, thunk_storage,
  43                   storage_bytes);
  44     EXPECT_EQ(STATUS_SUCCESS, ret);
  45
  46     this->target_ = fake_target_;
  47
  48     return ret;
  49   };
  50
  51  private:
  52   // Holds the address of the fake target.
  53   void* fake_target_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(ResolverThunkTest);
  56 };
  57
  58 typedef ResolverThunkTest<sandbox::ServiceResolverThunk> WinXpResolverTest;
  59
  60 #if !defined(_WIN64)
  61 typedef ResolverThunkTest<sandbox::Win8ResolverThunk> Win8ResolverTest;
  62 typedef ResolverThunkTest<sandbox::Wow64ResolverThunk> Wow64ResolverTest;
  63 typedef ResolverThunkTest<sandbox::Wow64W8ResolverThunk> Wow64W8ResolverTest;
  64 #endif
  65
  66 const BYTE kJump32 = 0xE9;
  67
  68 void CheckJump(void* source, void* target) {
  69 #pragma pack(push)
  70 #pragma pack(1)
  71   struct Code {
  72     BYTE jump;
  73     ULONG delta;
  74   };
  75 #pragma pack(pop)
  76
  77 #if defined(_WIN64)
  78   FAIL() << "Running 32-bit codepath";
  79 #else
  80   Code* patched = reinterpret_cast<Code*>(source);
  81   EXPECT_EQ(kJump32, patched->jump);
  82
  83   ULONG source_addr = bit_cast<ULONG>(source);
  84   ULONG target_addr = bit_cast<ULONG>(target);
  85   EXPECT_EQ(target_addr + 19 - source_addr, patched->delta);
  86 #endif
  87 }
  88
  89 NTSTATUS PatchNtdllWithResolver(const char* function, bool relaxed,
  90                                 sandbox::ServiceResolverThunk* resolver) {
  91   HMODULE ntdll_base = ::GetModuleHandle(L"ntdll.dll");
  92   EXPECT_TRUE(NULL != ntdll_base);
  93
  94   void* target = ::GetProcAddress(ntdll_base, function);
  95   EXPECT_TRUE(NULL != target);
  96   if (NULL == target)
  97     return STATUS_UNSUCCESSFUL;
  98
  99   BYTE service[50];
 100   memcpy(service, target, sizeof(service));
 101
 102   static_cast<WinXpResolverTest*>(resolver)->set_target(service);
 103
 104   // Any pointer will do as an interception_entry_point
 105   void* function_entry = resolver;
 106   size_t thunk_size = resolver->GetThunkSize();
 107   scoped_ptr<char[]> thunk(new char[thunk_size]);
 108   size_t used;
 109
 110   resolver->AllowLocalPatches();
 111
 112   NTSTATUS ret = resolver->Setup(ntdll_base, NULL, function, NULL,
 113                                  function_entry, thunk.get(), thunk_size,
 114                                  &used);
 115   if (NT_SUCCESS(ret)) {
 116     EXPECT_EQ(thunk_size, used);
 117     EXPECT_NE(0, memcmp(service, target, sizeof(service)));
 118     EXPECT_NE(kJump32, service[0]);
 119
 120     if (relaxed) {
 121       // It's already patched, let's patch again, and simulate a direct patch.
 122       service[0] = kJump32;
 123       ret = resolver->Setup(ntdll_base, NULL, function, NULL, function_entry,
 124                             thunk.get(), thunk_size, &used);
 125       CheckJump(service, thunk.get());
 126     }
 127   }
 128
 129   return ret;
 130 }
 131
 132 sandbox::ServiceResolverThunk* GetTestResolver(bool relaxed) {
 133 #if defined(_WIN64)
 134   return new WinXpResolverTest(relaxed);
 135 #else
 136   base::win::OSInfo* os_info = base::win::OSInfo::GetInstance();
 137   if (os_info->wow64_status() == base::win::OSInfo::WOW64_ENABLED) {
 138     if (os_info->version() >= base::win::VERSION_WIN8)
 139       return new Wow64W8ResolverTest(relaxed);
 140     return new Wow64ResolverTest(relaxed);
 141   }
 142
 143   if (os_info->version() >= base::win::VERSION_WIN8)
 144     return new Win8ResolverTest(relaxed);
 145
 146   return new WinXpResolverTest(relaxed);
 147 #endif
 148 }
 149
 150 NTSTATUS PatchNtdll(const char* function, bool relaxed) {
 151   sandbox::ServiceResolverThunk* resolver = GetTestResolver(relaxed);
 152
 153   NTSTATUS ret = PatchNtdllWithResolver(function, relaxed, resolver);
 154   delete resolver;
 155   return ret;
 156 }
 157
 158 TEST(ServiceResolverTest, PatchesServices) {
 159   NTSTATUS ret = PatchNtdll("NtClose", false);
 160   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtClose, last error: " << ::GetLastError();
 161
 162   ret = PatchNtdll("NtCreateFile", false);
 163   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateFile, last error: " <<
 164     ::GetLastError();
 165
 166   ret = PatchNtdll("NtCreateMutant", false);
 167   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateMutant, last error: " <<
 168     ::GetLastError();
 169
 170   ret = PatchNtdll("NtMapViewOfSection", false);
 171   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtMapViewOfSection, last error: " <<
 172     ::GetLastError();
 173 }
 174
 175 TEST(ServiceResolverTest, FailsIfNotService) {
 176 #if !defined(_WIN64)
 177   EXPECT_NE(STATUS_SUCCESS, PatchNtdll("RtlUlongByteSwap", false));
 178 #endif
 179
 180   EXPECT_NE(STATUS_SUCCESS, PatchNtdll("LdrLoadDll", false));
 181 }
 182
 183 TEST(ServiceResolverTest, PatchesPatchedServices) {
 184 // We don't support "relaxed mode" for Win64 apps.
 185 #if !defined(_WIN64)
 186   NTSTATUS ret = PatchNtdll("NtClose", true);
 187   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtClose, last error: " << ::GetLastError();
 188
 189   ret = PatchNtdll("NtCreateFile", true);
 190   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateFile, last error: " <<
 191     ::GetLastError();
 192
 193   ret = PatchNtdll("NtCreateMutant", true);
 194   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateMutant, last error: " <<
 195     ::GetLastError();
 196
 197   ret = PatchNtdll("NtMapViewOfSection", true);
 198   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtMapViewOfSection, last error: " <<
 199     ::GetLastError();
 200 #endif
 201 }
 202
 203 TEST(ServiceResolverTest, MultiplePatchedServices) {
 204 // We don't support "relaxed mode" for Win64 apps.
 205 #if !defined(_WIN64)
 206   sandbox::ServiceResolverThunk* resolver = GetTestResolver(true);
 207   NTSTATUS ret = PatchNtdllWithResolver("NtClose", true, resolver);
 208   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtClose, last error: " << ::GetLastError();
 209
 210   ret = PatchNtdllWithResolver("NtCreateFile", true, resolver);
 211   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateFile, last error: " <<
 212     ::GetLastError();
 213
 214   ret = PatchNtdllWithResolver("NtCreateMutant", true, resolver);
 215   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtCreateMutant, last error: " <<
 216     ::GetLastError();
 217
 218   ret = PatchNtdllWithResolver("NtMapViewOfSection", true, resolver);
 219   EXPECT_EQ(STATUS_SUCCESS, ret) << "NtMapViewOfSection, last error: " <<
 220     ::GetLastError();
 221   delete resolver;
 222 #endif
 223 }
 224
 225 TEST(ServiceResolverTest, LocalPatchesAllowed) {
 226   sandbox::ServiceResolverThunk* resolver = GetTestResolver(true);
 227
 228   HMODULE ntdll_base = ::GetModuleHandle(L"ntdll.dll");
 229   ASSERT_TRUE(NULL != ntdll_base);
 230
 231   const char kFunctionName[] = "NtClose";
 232
 233   void* target = ::GetProcAddress(ntdll_base, kFunctionName);
 234   ASSERT_TRUE(NULL != target);
 235
 236   BYTE service[50];
 237   memcpy(service, target, sizeof(service));
 238   static_cast<WinXpResolverTest*>(resolver)->set_target(service);
 239
 240   // Any pointer will do as an interception_entry_point
 241   void* function_entry = resolver;
 242   size_t thunk_size = resolver->GetThunkSize();
 243   scoped_ptr<char[]> thunk(new char[thunk_size]);
 244   size_t used;
 245
 246   NTSTATUS ret = STATUS_UNSUCCESSFUL;
 247
 248   // First try patching without having allowed local patches.
 249   ret = resolver->Setup(ntdll_base, NULL, kFunctionName, NULL,
 250                         function_entry, thunk.get(), thunk_size,
 251                         &used);
 252   EXPECT_FALSE(NT_SUCCESS(ret));
 253
 254   // Now allow local patches and check that things work.
 255   resolver->AllowLocalPatches();
 256   ret = resolver->Setup(ntdll_base, NULL, kFunctionName, NULL,
 257                         function_entry, thunk.get(), thunk_size,
 258                         &used);
 259   EXPECT_EQ(STATUS_SUCCESS, ret);
 260 }
 261
 262 }  // namespace