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| 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 #include "sandbox/src/service_resolver.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/memory/scoped_ptr.h" | |
| 9 #include "sandbox/src/win_utils.h" | |
| 10 | |
| 11 namespace { | |
| 12 #pragma pack(push, 1) | |
| 13 | |
| 14 const ULONG kMmovR10EcxMovEax = 0xB8D18B4C; | |
| 15 const USHORT kSyscall = 0x050F; | |
| 16 const BYTE kRetNp = 0xC3; | |
| 17 const ULONG64 kMov1 = 0x54894808244C8948; | |
| 18 const ULONG64 kMov2 = 0x4C182444894C1024; | |
| 19 const ULONG kMov3 = 0x20244C89; | |
| 20 | |
| 21 // Service code for 64 bit systems. | |
| 22 struct ServiceEntry { | |
| 23 // This struct contains roughly the following code: | |
| 24 // 00 mov r10,rcx | |
| 25 // 03 mov eax,52h | |
| 26 // 08 syscall | |
| 27 // 0a ret | |
| 28 // 0b xchg ax,ax | |
| 29 // 0e xchg ax,ax | |
| 30 | |
| 31 ULONG mov_r10_rcx_mov_eax; // = 4C 8B D1 B8 | |
| 32 ULONG service_id; | |
| 33 USHORT syscall; // = 0F 05 | |
| 34 BYTE ret; // = C3 | |
| 35 BYTE pad; // = 66 | |
| 36 USHORT xchg_ax_ax1; // = 66 90 | |
| 37 USHORT xchg_ax_ax2; // = 66 90 | |
| 38 }; | |
| 39 | |
| 40 // Service code for 64 bit Windows 8. | |
| 41 struct ServiceEntryW8 { | |
| 42 // This struct contains the following code: | |
| 43 // 00 48894c2408 mov [rsp+8], rcx | |
| 44 // 05 4889542410 mov [rsp+10], rdx | |
| 45 // 0a 4c89442418 mov [rsp+18], r8 | |
| 46 // 0f 4c894c2420 mov [rsp+20], r9 | |
| 47 // 14 4c8bd1 mov r10,rcx | |
| 48 // 17 b825000000 mov eax,25h | |
| 49 // 1c 0f05 syscall | |
| 50 // 1e c3 ret | |
| 51 // 1f 90 nop | |
| 52 | |
| 53 ULONG64 mov_1; // = 48 89 4C 24 08 48 89 54 | |
| 54 ULONG64 mov_2; // = 24 10 4C 89 44 24 18 4C | |
| 55 ULONG mov_3; // = 89 4C 24 20 | |
| 56 ULONG mov_r10_rcx_mov_eax; // = 4C 8B D1 B8 | |
| 57 ULONG service_id; | |
| 58 USHORT syscall; // = 0F 05 | |
| 59 BYTE ret; // = C2 | |
| 60 BYTE nop; // = 90 | |
| 61 }; | |
| 62 | |
| 63 // We don't have an internal thunk for x64. | |
| 64 struct ServiceFullThunk { | |
| 65 union { | |
| 66 ServiceEntry original; | |
| 67 ServiceEntryW8 original_w8; | |
| 68 }; | |
| 69 }; | |
| 70 | |
| 71 #pragma pack(pop) | |
| 72 | |
| 73 bool IsService(const void* source) { | |
| 74 const ServiceEntry* service = | |
| 75 reinterpret_cast<const ServiceEntry*>(source); | |
| 76 | |
| 77 return (kMmovR10EcxMovEax == service->mov_r10_rcx_mov_eax && | |
| 78 kSyscall == service->syscall && kRetNp == service->ret); | |
| 79 } | |
| 80 | |
| 81 }; // namespace | |
| 82 | |
| 83 namespace sandbox { | |
| 84 | |
| 85 NTSTATUS ServiceResolverThunk::Setup(const void* target_module, | |
| 86 const void* interceptor_module, | |
| 87 const char* target_name, | |
| 88 const char* interceptor_name, | |
| 89 const void* interceptor_entry_point, | |
| 90 void* thunk_storage, | |
| 91 size_t storage_bytes, | |
| 92 size_t* storage_used) { | |
| 93 NTSTATUS ret = Init(target_module, interceptor_module, target_name, | |
| 94 interceptor_name, interceptor_entry_point, | |
| 95 thunk_storage, storage_bytes); | |
| 96 if (!NT_SUCCESS(ret)) | |
| 97 return ret; | |
| 98 | |
| 99 size_t thunk_bytes = GetThunkSize(); | |
| 100 scoped_array<char> thunk_buffer(new char[thunk_bytes]); | |
| 101 ServiceFullThunk* thunk = reinterpret_cast<ServiceFullThunk*>( | |
| 102 thunk_buffer.get()); | |
| 103 | |
| 104 if (!IsFunctionAService(&thunk->original)) | |
| 105 return STATUS_UNSUCCESSFUL; | |
| 106 | |
| 107 ret = PerformPatch(thunk, thunk_storage); | |
| 108 | |
| 109 if (NULL != storage_used) | |
| 110 *storage_used = thunk_bytes; | |
| 111 | |
| 112 return ret; | |
| 113 } | |
| 114 | |
| 115 size_t ServiceResolverThunk::GetThunkSize() const { | |
| 116 return sizeof(ServiceFullThunk); | |
| 117 } | |
| 118 | |
| 119 bool ServiceResolverThunk::IsFunctionAService(void* local_thunk) const { | |
| 120 ServiceFullThunk function_code; | |
| 121 SIZE_T read; | |
| 122 if (!::ReadProcessMemory(process_, target_, &function_code, | |
| 123 sizeof(function_code), &read)) | |
| 124 return false; | |
| 125 | |
| 126 if (sizeof(function_code) != read) | |
| 127 return false; | |
| 128 | |
| 129 if (!IsService(&function_code)) { | |
| 130 // See if it's the Win8 signature. | |
| 131 ServiceEntryW8* w8_service = &function_code.original_w8; | |
| 132 if (!IsService(&w8_service->mov_r10_rcx_mov_eax) || | |
| 133 w8_service->mov_1 != kMov1 || w8_service->mov_1 != kMov1 || | |
| 134 w8_service->mov_1 != kMov1) { | |
| 135 return false; | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 // Save the verified code. | |
| 140 memcpy(local_thunk, &function_code, sizeof(function_code)); | |
| 141 | |
| 142 return true; | |
| 143 } | |
| 144 | |
| 145 NTSTATUS ServiceResolverThunk::PerformPatch(void* local_thunk, | |
| 146 void* remote_thunk) { | |
| 147 ServiceFullThunk* full_local_thunk = reinterpret_cast<ServiceFullThunk*>( | |
| 148 local_thunk); | |
| 149 ServiceFullThunk* full_remote_thunk = reinterpret_cast<ServiceFullThunk*>( | |
| 150 remote_thunk); | |
| 151 | |
| 152 // Patch the original code. | |
| 153 ServiceEntry local_service; | |
| 154 DCHECK_GE(GetInternalThunkSize(), sizeof(local_service)); | |
| 155 if (!SetInternalThunk(&local_service, sizeof(local_service), NULL, | |
| 156 interceptor_)) | |
| 157 return STATUS_UNSUCCESSFUL; | |
| 158 | |
| 159 // Copy the local thunk buffer to the child. | |
| 160 SIZE_T actual; | |
| 161 if (!::WriteProcessMemory(process_, remote_thunk, local_thunk, | |
| 162 sizeof(ServiceFullThunk), &actual)) | |
| 163 return STATUS_UNSUCCESSFUL; | |
| 164 | |
| 165 if (sizeof(ServiceFullThunk) != actual) | |
| 166 return STATUS_UNSUCCESSFUL; | |
| 167 | |
| 168 // And now change the function to intercept, on the child. | |
| 169 if (NULL != ntdll_base_) { | |
| 170 // Running a unit test. | |
| 171 if (!::WriteProcessMemory(process_, target_, &local_service, | |
| 172 sizeof(local_service), &actual)) | |
| 173 return STATUS_UNSUCCESSFUL; | |
| 174 } else { | |
| 175 if (!WriteProtectedChildMemory(process_, target_, &local_service, | |
| 176 sizeof(local_service))) | |
| 177 return STATUS_UNSUCCESSFUL; | |
| 178 } | |
| 179 | |
| 180 return STATUS_SUCCESS; | |
| 181 } | |
| 182 | |
| 183 bool Wow64ResolverThunk::IsFunctionAService(void* local_thunk) const { | |
| 184 NOTREACHED(); | |
| 185 return false; | |
| 186 } | |
| 187 | |
| 188 bool Win2kResolverThunk::IsFunctionAService(void* local_thunk) const { | |
| 189 NOTREACHED(); | |
| 190 return false; | |
| 191 } | |
| 192 | |
| 193 } // namespace sandbox | |
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Chromium Code Reviews
Issue 10783004:
Move Windows Sandbox, trybots version (don't commit me!) (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src