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| 1 // Copyright 2013 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 // Implementation of NtMapViewOfSection intercept for 32 bit builds. | |
| 6 // | |
| 7 // TODO(robertshield): Implement the 64 bit intercept. | |
| 8 | |
| 9 #include "chrome_elf/blacklist/blacklist_interceptions.h" | |
| 10 | |
| 11 #include <string> | |
| 12 #include <vector> | |
| 13 | |
| 14 // Note that only #includes from base that are either header-only or built into | |
| 15 // base_static (see base/base.gyp) are allowed here. | |
| 16 #include "base/basictypes.h" | |
| 17 #include "base/strings/string16.h" | |
| 18 #include "base/win/pe_image.h" | |
| 19 #include "chrome_elf/blacklist/blacklist.h" | |
| 20 #include "sandbox/win/src/internal_types.h" | |
| 21 #include "sandbox/win/src/nt_internals.h" | |
| 22 #include "sandbox/win/src/sandbox_nt_util.h" | |
| 23 #include "sandbox/win/src/sandbox_types.h" | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 NtQuerySectionFunction g_nt_query_section_func = NULL; | |
| 28 NtQueryVirtualMemoryFunction g_nt_query_virtual_memory_func = NULL; | |
| 29 NtUnmapViewOfSectionFunction g_nt_unmap_view_of_section_func = NULL; | |
| 30 | |
| 31 // TODO(robertshield): Merge with ntdll exports cache. | |
| 32 FARPROC GetNtDllExportByName(const char* export_name) { | |
| 33 HMODULE ntdll = ::GetModuleHandle(sandbox::kNtdllName); | |
| 34 return ::GetProcAddress(ntdll, export_name); | |
| 35 } | |
| 36 | |
| 37 bool DllMatch(const string16& module_name) { | |
| 38 for (int i = 0; i < blacklist::g_troublesome_dlls_cur_index; ++i) { | |
| 39 if (module_name == blacklist::g_troublesome_dlls[i]) | |
| 40 return true; | |
| 41 } | |
| 42 return false; | |
| 43 } | |
| 44 | |
| 45 // TODO(robertshield): Some of the helper functions below overlap somewhat with | |
| 46 // code in sandbox_nt_util.cc. See if they can be unified. | |
| 47 | |
| 48 // Native reimplementation of PSAPIs GetMappedFileName. | |
| 49 string16 GetBackingModuleFilePath(PVOID address) { | |
| 50 DCHECK_NT(g_nt_query_virtual_memory_func); | |
| 51 | |
| 52 // We'll start with something close to max_path characters for the name. | |
| 53 ULONG buffer_bytes = MAX_PATH * 2; | |
| 54 std::vector<BYTE> buffer_data(buffer_bytes); | |
| 55 | |
| 56 for (;;) { | |
| 57 MEMORY_SECTION_NAME* section_name = | |
| 58 reinterpret_cast<MEMORY_SECTION_NAME*>(&buffer_data[0]); | |
| 59 | |
| 60 if (!section_name) | |
| 61 break; | |
| 62 | |
| 63 ULONG returned_bytes; | |
| 64 NTSTATUS ret = g_nt_query_virtual_memory_func( | |
| 65 NtCurrentProcess, address, MemorySectionName, section_name, | |
| 66 buffer_bytes, &returned_bytes); | |
| 67 | |
| 68 if (STATUS_BUFFER_OVERFLOW == ret) { | |
| 69 // Retry the call with the given buffer size. | |
| 70 buffer_bytes = returned_bytes + 1; | |
| 71 buffer_data.resize(buffer_bytes); | |
| 72 section_name = NULL; | |
| 73 continue; | |
| 74 } | |
| 75 if (!NT_SUCCESS(ret)) | |
| 76 break; | |
| 77 | |
| 78 UNICODE_STRING* section_string = | |
| 79 reinterpret_cast<UNICODE_STRING*>(section_name); | |
| 80 return string16(section_string->Buffer, | |
| 81 section_string->Length / sizeof(wchar_t)); | |
| 82 } | |
| 83 | |
| 84 return string16(); | |
| 85 } | |
| 86 | |
| 87 bool IsModuleValidImageSection(HANDLE section, | |
| 88 PVOID *base, | |
| 89 PLARGE_INTEGER offset, | |
| 90 PSIZE_T view_size) { | |
| 91 DCHECK_NT(g_nt_query_section_func); | |
| 92 | |
| 93 if (!section || !base || !view_size || offset) | |
| 94 return false; | |
| 95 | |
| 96 SECTION_BASIC_INFORMATION basic_info; | |
| 97 SIZE_T bytes_returned; | |
| 98 NTSTATUS ret = g_nt_query_section_func(section, SectionBasicInformation, | |
| 99 &basic_info, sizeof(basic_info), | |
| 100 &bytes_returned); | |
| 101 | |
| 102 if (!NT_SUCCESS(ret) || sizeof(basic_info) != bytes_returned) | |
| 103 return false; | |
| 104 | |
| 105 if (!(basic_info.Attributes & SEC_IMAGE)) | |
| 106 return false; | |
| 107 | |
| 108 return true; | |
| 109 } | |
| 110 | |
| 111 string16 ExtractLoadedModuleName(const string16& module_path) { | |
| 112 if (module_path.empty() || module_path[module_path.size() - 1] == L'\\') | |
| 113 return string16(); | |
| 114 | |
| 115 size_t sep = module_path.find_last_of(L'\\'); | |
| 116 if (sep == string16::npos) | |
| 117 return module_path; | |
| 118 else | |
| 119 return module_path.substr(sep+1); | |
| 120 } | |
| 121 | |
| 122 // Fills |out_name| with the image name from the given |pe| image and |flags| | |
| 123 // with additional info about the image. | |
| 124 void SafeGetImageInfo(const base::win::PEImage& pe, | |
| 125 std::string* out_name, | |
| 126 uint32* flags) { | |
| 127 out_name->clear(); | |
| 128 out_name->reserve(MAX_PATH); | |
| 129 *flags = 0; | |
| 130 __try { | |
| 131 if (pe.VerifyMagic()) { | |
| 132 *flags |= sandbox::MODULE_IS_PE_IMAGE; | |
| 133 | |
| 134 PIMAGE_EXPORT_DIRECTORY exports = pe.GetExportDirectory(); | |
| 135 if (exports) { | |
| 136 char* image_name = reinterpret_cast<char*>(pe.RVAToAddr(exports->Name)); | |
| 137 size_t i = 0; | |
| 138 for (; i < MAX_PATH && *image_name; ++i, ++image_name) | |
| 139 out_name->push_back(*image_name); | |
| 140 } | |
| 141 | |
| 142 PIMAGE_NT_HEADERS headers = pe.GetNTHeaders(); | |
| 143 if (headers) { | |
| 144 if (headers->OptionalHeader.AddressOfEntryPoint) | |
| 145 *flags |= sandbox::MODULE_HAS_ENTRY_POINT; | |
| 146 if (headers->OptionalHeader.SizeOfCode) | |
| 147 *flags |= sandbox::MODULE_HAS_CODE; | |
| 148 } | |
| 149 } | |
| 150 } __except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ? | |
| 151 EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) { | |
| 152 out_name->clear(); | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 string16 GetImageInfoFromLoadedModule(HMODULE module, uint32* flags) { | |
| 157 std::string out_name; | |
| 158 base::win::PEImage pe(module); | |
| 159 SafeGetImageInfo(pe, &out_name, flags); | |
| 160 return string16(out_name.begin(), out_name.end()); | |
| 161 } | |
| 162 | |
| 163 } // namespace | |
| 164 | |
| 165 namespace blacklist { | |
| 166 | |
| 167 bool InitializeInterceptImports() { | |
| 168 g_nt_query_section_func = reinterpret_cast<NtQuerySectionFunction>( | |
| 169 GetNtDllExportByName("NtQuerySection")); | |
| 170 g_nt_query_virtual_memory_func = | |
| 171 reinterpret_cast<NtQueryVirtualMemoryFunction>( | |
| 172 GetNtDllExportByName("NtQueryVirtualMemory")); | |
| 173 g_nt_unmap_view_of_section_func = | |
| 174 reinterpret_cast<NtUnmapViewOfSectionFunction>( | |
| 175 GetNtDllExportByName("NtUnmapViewOfSection")); | |
| 176 | |
| 177 return g_nt_query_section_func && g_nt_query_virtual_memory_func && | |
| 178 g_nt_unmap_view_of_section_func; | |
| 179 } | |
| 180 | |
| 181 SANDBOX_INTERCEPT NTSTATUS WINAPI BlNtMapViewOfSection( | |
| 182 NtMapViewOfSectionFunction orig_MapViewOfSection, | |
| 183 HANDLE section, | |
| 184 HANDLE process, | |
| 185 PVOID *base, | |
| 186 ULONG_PTR zero_bits, | |
| 187 SIZE_T commit_size, | |
| 188 PLARGE_INTEGER offset, | |
| 189 PSIZE_T view_size, | |
| 190 SECTION_INHERIT inherit, | |
| 191 ULONG allocation_type, | |
| 192 ULONG protect) { | |
| 193 NTSTATUS ret = orig_MapViewOfSection(section, process, base, zero_bits, | |
| 194 commit_size, offset, view_size, inherit, | |
| 195 allocation_type, protect); | |
| 196 | |
| 197 if (!NT_SUCCESS(ret) || !sandbox::IsSameProcess(process) || | |
| 198 !IsModuleValidImageSection(section, base, offset, view_size)) { | |
| 199 return ret; | |
| 200 } | |
| 201 | |
| 202 HMODULE module = reinterpret_cast<HMODULE>(*base); | |
| 203 if (module) { | |
| 204 UINT image_flags; | |
| 205 | |
| 206 string16 module_name(GetImageInfoFromLoadedModule( | |
| 207 reinterpret_cast<HMODULE>(*base), &image_flags)); | |
| 208 string16 file_name(GetBackingModuleFilePath(*base)); | |
| 209 | |
| 210 if (module_name.empty() && (image_flags & sandbox::MODULE_HAS_CODE)) { | |
| 211 // If the module has no exports we retrieve the module name from the | |
| 212 // full path of the mapped section. | |
| 213 module_name = ExtractLoadedModuleName(file_name); | |
| 214 } | |
| 215 | |
| 216 if (!module_name.empty() && DllMatch(module_name)) { | |
| 217 DCHECK_NT(g_nt_unmap_view_of_section_func); | |
| 218 g_nt_unmap_view_of_section_func(process, *base); | |
| 219 ret = STATUS_UNSUCCESSFUL; | |
| 220 } | |
| 221 | |
| 222 } | |
| 223 return ret; | |
| 224 } | |
| 225 | |
| 226 } // namespace blacklist | |
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Chromium Code Reviews
Issue 107443008:
Revert 241548 "Chrome browser process DLL blacklist." (Closed)
Base URL: svn://svn.chromium.org/chrome/