michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: // For information about interceptions as a whole see
michael@0: // http://dev.chromium.org/developers/design-documents/sandbox .
michael@0: 
michael@0: #include <set>
michael@0: 
michael@0: #include "sandbox/win/src/interception.h"
michael@0: 
michael@0: #include "base/logging.h"
michael@0: #include "base/memory/scoped_ptr.h"
michael@0: #include "base/win/pe_image.h"
michael@0: #include "base/win/windows_version.h"
michael@0: #include "sandbox/win/src/interception_internal.h"
michael@0: #include "sandbox/win/src/interceptors.h"
michael@0: #include "sandbox/win/src/sandbox.h"
michael@0: #include "sandbox/win/src/sandbox_utils.h"
michael@0: #include "sandbox/win/src/service_resolver.h"
michael@0: #include "sandbox/win/src/target_interceptions.h"
michael@0: #include "sandbox/win/src/target_process.h"
michael@0: #include "sandbox/win/src/wow64.h"
michael@0: 
michael@0: namespace {
michael@0: 
michael@0: const char kMapViewOfSectionName[] = "NtMapViewOfSection";
michael@0: const char kUnmapViewOfSectionName[] = "NtUnmapViewOfSection";
michael@0: 
michael@0: // Standard allocation granularity and page size for Windows.
michael@0: const size_t kAllocGranularity = 65536;
michael@0: const size_t kPageSize = 4096;
michael@0: 
michael@0: // Find a random offset within 64k and aligned to ceil(log2(size)).
michael@0: size_t GetGranularAlignedRandomOffset(size_t size) {
michael@0:   CHECK_LE(size, kAllocGranularity);
michael@0:   unsigned int offset;
michael@0: 
michael@0:   do {
michael@0:     rand_s(&offset);
michael@0:     offset &= (kAllocGranularity - 1);
michael@0:   } while (offset > (kAllocGranularity - size));
michael@0: 
michael@0:   // Find an alignment between 64 and the page size (4096).
michael@0:   size_t align_size = kPageSize;
michael@0:   for (size_t new_size = align_size / 2;  new_size >= size; new_size /= 2) {
michael@0:     align_size = new_size;
michael@0:   }
michael@0:   return offset & ~(align_size - 1);
michael@0: }
michael@0: 
michael@0: }  // namespace
michael@0: 
michael@0: namespace sandbox {
michael@0: 
michael@0: SANDBOX_INTERCEPT SharedMemory* g_interceptions;
michael@0: 
michael@0: // Table of the unpatched functions that we intercept. Mapped from the parent.
michael@0: SANDBOX_INTERCEPT OriginalFunctions g_originals = { NULL };
michael@0: 
michael@0: // Magic constant that identifies that this function is not to be patched.
michael@0: const char kUnloadDLLDummyFunction[] = "@";
michael@0: 
michael@0: InterceptionManager::InterceptionManager(TargetProcess* child_process,
michael@0:                                          bool relaxed)
michael@0:     : child_(child_process), names_used_(false), relaxed_(relaxed) {
michael@0:   child_->AddRef();
michael@0: }
michael@0: InterceptionManager::~InterceptionManager() {
michael@0:   child_->Release();
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::AddToPatchedFunctions(
michael@0:     const wchar_t* dll_name, const char* function_name,
michael@0:     InterceptionType interception_type, const void* replacement_code_address,
michael@0:     InterceptorId id) {
michael@0:   InterceptionData function;
michael@0:   function.type = interception_type;
michael@0:   function.id = id;
michael@0:   function.dll = dll_name;
michael@0:   function.function = function_name;
michael@0:   function.interceptor_address = replacement_code_address;
michael@0: 
michael@0:   interceptions_.push_back(function);
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::AddToPatchedFunctions(
michael@0:     const wchar_t* dll_name, const char* function_name,
michael@0:     InterceptionType interception_type, const char* replacement_function_name,
michael@0:     InterceptorId id) {
michael@0:   InterceptionData function;
michael@0:   function.type = interception_type;
michael@0:   function.id = id;
michael@0:   function.dll = dll_name;
michael@0:   function.function = function_name;
michael@0:   function.interceptor = replacement_function_name;
michael@0:   function.interceptor_address = NULL;
michael@0: 
michael@0:   interceptions_.push_back(function);
michael@0:   names_used_ = true;
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::AddToUnloadModules(const wchar_t* dll_name) {
michael@0:   InterceptionData module_to_unload;
michael@0:   module_to_unload.type = INTERCEPTION_UNLOAD_MODULE;
michael@0:   module_to_unload.dll = dll_name;
michael@0:   // The next two are dummy values that make the structures regular, instead
michael@0:   // of having special cases. They should not be used.
michael@0:   module_to_unload.function = kUnloadDLLDummyFunction;
michael@0:   module_to_unload.interceptor_address = reinterpret_cast<void*>(1);
michael@0: 
michael@0:   interceptions_.push_back(module_to_unload);
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::InitializeInterceptions() {
michael@0:   if (interceptions_.empty())
michael@0:     return true;  // Nothing to do here
michael@0: 
michael@0:   size_t buffer_bytes = GetBufferSize();
michael@0:   scoped_ptr<char[]> local_buffer(new char[buffer_bytes]);
michael@0: 
michael@0:   if (!SetupConfigBuffer(local_buffer.get(), buffer_bytes))
michael@0:     return false;
michael@0: 
michael@0:   void* remote_buffer;
michael@0:   if (!CopyDataToChild(local_buffer.get(), buffer_bytes, &remote_buffer))
michael@0:     return false;
michael@0: 
michael@0:   bool hot_patch_needed = (0 != buffer_bytes);
michael@0:   if (!PatchNtdll(hot_patch_needed))
michael@0:     return false;
michael@0: 
michael@0:   g_interceptions = reinterpret_cast<SharedMemory*>(remote_buffer);
michael@0:   ResultCode rc = child_->TransferVariable("g_interceptions",
michael@0:                                            &g_interceptions,
michael@0:                                            sizeof(g_interceptions));
michael@0:   return (SBOX_ALL_OK == rc);
michael@0: }
michael@0: 
michael@0: size_t InterceptionManager::GetBufferSize() const {
michael@0:   std::set<std::wstring> dlls;
michael@0:   size_t buffer_bytes = 0;
michael@0: 
michael@0:   std::list<InterceptionData>::const_iterator it = interceptions_.begin();
michael@0:   for (; it != interceptions_.end(); ++it) {
michael@0:     // skip interceptions that are performed from the parent
michael@0:     if (!IsInterceptionPerformedByChild(*it))
michael@0:       continue;
michael@0: 
michael@0:     if (!dlls.count(it->dll)) {
michael@0:       // NULL terminate the dll name on the structure
michael@0:       size_t dll_name_bytes = (it->dll.size() + 1) * sizeof(wchar_t);
michael@0: 
michael@0:       // include the dll related size
michael@0:       buffer_bytes += RoundUpToMultiple(offsetof(DllPatchInfo, dll_name) +
michael@0:                                             dll_name_bytes, sizeof(size_t));
michael@0:       dlls.insert(it->dll);
michael@0:     }
michael@0: 
michael@0:     // we have to NULL terminate the strings on the structure
michael@0:     size_t strings_chars = it->function.size() + it->interceptor.size() + 2;
michael@0: 
michael@0:     // a new FunctionInfo is required per function
michael@0:     size_t record_bytes = offsetof(FunctionInfo, function) + strings_chars;
michael@0:     record_bytes = RoundUpToMultiple(record_bytes, sizeof(size_t));
michael@0:     buffer_bytes += record_bytes;
michael@0:   }
michael@0: 
michael@0:   if (0 != buffer_bytes)
michael@0:     // add the part of SharedMemory that we have not counted yet
michael@0:     buffer_bytes += offsetof(SharedMemory, dll_list);
michael@0: 
michael@0:   return buffer_bytes;
michael@0: }
michael@0: 
michael@0: // Basically, walk the list of interceptions moving them to the config buffer,
michael@0: // but keeping together all interceptions that belong to the same dll.
michael@0: // The config buffer is a local buffer, not the one allocated on the child.
michael@0: bool InterceptionManager::SetupConfigBuffer(void* buffer, size_t buffer_bytes) {
michael@0:   if (0 == buffer_bytes)
michael@0:     return true;
michael@0: 
michael@0:   DCHECK(buffer_bytes > sizeof(SharedMemory));
michael@0: 
michael@0:   SharedMemory* shared_memory = reinterpret_cast<SharedMemory*>(buffer);
michael@0:   DllPatchInfo* dll_info = shared_memory->dll_list;
michael@0:   int num_dlls = 0;
michael@0: 
michael@0:   shared_memory->interceptor_base = names_used_ ? child_->MainModule() : NULL;
michael@0: 
michael@0:   buffer_bytes -= offsetof(SharedMemory, dll_list);
michael@0:   buffer = dll_info;
michael@0: 
michael@0:   std::list<InterceptionData>::iterator it = interceptions_.begin();
michael@0:   for (; it != interceptions_.end();) {
michael@0:     // skip interceptions that are performed from the parent
michael@0:     if (!IsInterceptionPerformedByChild(*it)) {
michael@0:       ++it;
michael@0:       continue;
michael@0:     }
michael@0: 
michael@0:     const std::wstring dll = it->dll;
michael@0:     if (!SetupDllInfo(*it, &buffer, &buffer_bytes))
michael@0:       return false;
michael@0: 
michael@0:     // walk the interceptions from this point, saving the ones that are
michael@0:     // performed on this dll, and removing the entry from the list.
michael@0:     // advance the iterator before removing the element from the list
michael@0:     std::list<InterceptionData>::iterator rest = it;
michael@0:     for (; rest != interceptions_.end();) {
michael@0:       if (rest->dll == dll) {
michael@0:         if (!SetupInterceptionInfo(*rest, &buffer, &buffer_bytes, dll_info))
michael@0:           return false;
michael@0:         if (it == rest)
michael@0:           ++it;
michael@0:         rest = interceptions_.erase(rest);
michael@0:       } else {
michael@0:         ++rest;
michael@0:       }
michael@0:     }
michael@0:     dll_info = reinterpret_cast<DllPatchInfo*>(buffer);
michael@0:     ++num_dlls;
michael@0:   }
michael@0: 
michael@0:   shared_memory->num_intercepted_dlls = num_dlls;
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: // Fills up just the part that depends on the dll, not the info that depends on
michael@0: // the actual interception.
michael@0: bool InterceptionManager::SetupDllInfo(const InterceptionData& data,
michael@0:                                        void** buffer,
michael@0:                                        size_t* buffer_bytes) const {
michael@0:   DCHECK(buffer_bytes);
michael@0:   DCHECK(buffer);
michael@0:   DCHECK(*buffer);
michael@0: 
michael@0:   DllPatchInfo* dll_info = reinterpret_cast<DllPatchInfo*>(*buffer);
michael@0: 
michael@0:   // the strings have to be zero terminated
michael@0:   size_t required = offsetof(DllPatchInfo, dll_name) +
michael@0:                     (data.dll.size() + 1) * sizeof(wchar_t);
michael@0:   required = RoundUpToMultiple(required, sizeof(size_t));
michael@0:   if (*buffer_bytes < required)
michael@0:     return false;
michael@0: 
michael@0:   *buffer_bytes -= required;
michael@0:   *buffer = reinterpret_cast<char*>(*buffer) + required;
michael@0: 
michael@0:   // set up the dll info to be what we know about it at this time
michael@0:   dll_info->unload_module = (data.type == INTERCEPTION_UNLOAD_MODULE);
michael@0:   dll_info->record_bytes = required;
michael@0:   dll_info->offset_to_functions = required;
michael@0:   dll_info->num_functions = 0;
michael@0:   data.dll._Copy_s(dll_info->dll_name, data.dll.size(), data.dll.size());
michael@0:   dll_info->dll_name[data.dll.size()] = L'\0';
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::SetupInterceptionInfo(const InterceptionData& data,
michael@0:                                                 void** buffer,
michael@0:                                                 size_t* buffer_bytes,
michael@0:                                                 DllPatchInfo* dll_info) const {
michael@0:   DCHECK(buffer_bytes);
michael@0:   DCHECK(buffer);
michael@0:   DCHECK(*buffer);
michael@0: 
michael@0:   if ((dll_info->unload_module) &&
michael@0:       (data.function != kUnloadDLLDummyFunction)) {
michael@0:     // Can't specify a dll for both patch and unload.
michael@0:     NOTREACHED();
michael@0:   }
michael@0: 
michael@0:   FunctionInfo* function = reinterpret_cast<FunctionInfo*>(*buffer);
michael@0: 
michael@0:   size_t name_bytes = data.function.size();
michael@0:   size_t interceptor_bytes = data.interceptor.size();
michael@0: 
michael@0:   // the strings at the end of the structure are zero terminated
michael@0:   size_t required = offsetof(FunctionInfo, function) +
michael@0:                     name_bytes + interceptor_bytes + 2;
michael@0:   required = RoundUpToMultiple(required, sizeof(size_t));
michael@0:   if (*buffer_bytes < required)
michael@0:     return false;
michael@0: 
michael@0:   // update the caller's values
michael@0:   *buffer_bytes -= required;
michael@0:   *buffer = reinterpret_cast<char*>(*buffer) + required;
michael@0: 
michael@0:   function->record_bytes = required;
michael@0:   function->type = data.type;
michael@0:   function->id = data.id;
michael@0:   function->interceptor_address = data.interceptor_address;
michael@0:   char* names = function->function;
michael@0: 
michael@0:   data.function._Copy_s(names, name_bytes, name_bytes);
michael@0:   names += name_bytes;
michael@0:   *names++ = '\0';
michael@0: 
michael@0:   // interceptor follows the function_name
michael@0:   data.interceptor._Copy_s(names, interceptor_bytes, interceptor_bytes);
michael@0:   names += interceptor_bytes;
michael@0:   *names++ = '\0';
michael@0: 
michael@0:   // update the dll table
michael@0:   dll_info->num_functions++;
michael@0:   dll_info->record_bytes += required;
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::CopyDataToChild(const void* local_buffer,
michael@0:                                           size_t buffer_bytes,
michael@0:                                           void** remote_buffer) const {
michael@0:   DCHECK(NULL != remote_buffer);
michael@0:   if (0 == buffer_bytes) {
michael@0:     *remote_buffer = NULL;
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   HANDLE child = child_->Process();
michael@0: 
michael@0:   // Allocate memory on the target process without specifying the address
michael@0:   void* remote_data = ::VirtualAllocEx(child, NULL, buffer_bytes,
michael@0:                                        MEM_COMMIT, PAGE_READWRITE);
michael@0:   if (NULL == remote_data)
michael@0:     return false;
michael@0: 
michael@0:   SIZE_T bytes_written;
michael@0:   BOOL success = ::WriteProcessMemory(child, remote_data, local_buffer,
michael@0:                                       buffer_bytes, &bytes_written);
michael@0:   if (FALSE == success || bytes_written != buffer_bytes) {
michael@0:     ::VirtualFreeEx(child, remote_data, 0, MEM_RELEASE);
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   *remote_buffer = remote_data;
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: // Only return true if the child should be able to perform this interception.
michael@0: bool InterceptionManager::IsInterceptionPerformedByChild(
michael@0:     const InterceptionData& data) const {
michael@0:   if (INTERCEPTION_INVALID == data.type)
michael@0:     return false;
michael@0: 
michael@0:   if (INTERCEPTION_SERVICE_CALL == data.type)
michael@0:     return false;
michael@0: 
michael@0:   if (data.type >= INTERCEPTION_LAST)
michael@0:     return false;
michael@0: 
michael@0:   std::wstring ntdll(kNtdllName);
michael@0:   if (ntdll == data.dll)
michael@0:     return false;  // ntdll has to be intercepted from the parent
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::PatchNtdll(bool hot_patch_needed) {
michael@0:   // Maybe there is nothing to do
michael@0:   if (!hot_patch_needed && interceptions_.empty())
michael@0:     return true;
michael@0: 
michael@0:   if (hot_patch_needed) {
michael@0: #if SANDBOX_EXPORTS
michael@0:     // Make sure the functions are not excluded by the linker.
michael@0: #if defined(_WIN64)
michael@0:     #pragma comment(linker, "/include:TargetNtMapViewOfSection64")
michael@0:     #pragma comment(linker, "/include:TargetNtUnmapViewOfSection64")
michael@0: #else
michael@0:     #pragma comment(linker, "/include:_TargetNtMapViewOfSection@44")
michael@0:     #pragma comment(linker, "/include:_TargetNtUnmapViewOfSection@12")
michael@0: #endif
michael@0: #endif
michael@0:     ADD_NT_INTERCEPTION(NtMapViewOfSection, MAP_VIEW_OF_SECTION_ID, 44);
michael@0:     ADD_NT_INTERCEPTION(NtUnmapViewOfSection, UNMAP_VIEW_OF_SECTION_ID, 12);
michael@0:   }
michael@0: 
michael@0:   // Reserve a full 64k memory range in the child process.
michael@0:   HANDLE child = child_->Process();
michael@0:   BYTE* thunk_base = reinterpret_cast<BYTE*>(
michael@0:                          ::VirtualAllocEx(child, NULL, kAllocGranularity,
michael@0:                                           MEM_RESERVE, PAGE_NOACCESS));
michael@0: 
michael@0:   // Find an aligned, random location within the reserved range.
michael@0:   size_t thunk_bytes = interceptions_.size() * sizeof(ThunkData) +
michael@0:                        sizeof(DllInterceptionData);
michael@0:   size_t thunk_offset = GetGranularAlignedRandomOffset(thunk_bytes);
michael@0: 
michael@0:   // Split the base and offset along page boundaries.
michael@0:   thunk_base += thunk_offset & ~(kPageSize - 1);
michael@0:   thunk_offset &= kPageSize - 1;
michael@0: 
michael@0:   // Make an aligned, padded allocation, and move the pointer to our chunk.
michael@0:   size_t thunk_bytes_padded = (thunk_bytes + kPageSize - 1) & kPageSize;
michael@0:   thunk_base = reinterpret_cast<BYTE*>(
michael@0:                    ::VirtualAllocEx(child, thunk_base, thunk_bytes_padded,
michael@0:                                     MEM_COMMIT, PAGE_EXECUTE_READWRITE));
michael@0:   CHECK(thunk_base);  // If this fails we'd crash anyway on an invalid access.
michael@0:   DllInterceptionData* thunks = reinterpret_cast<DllInterceptionData*>(
michael@0:                                     thunk_base + thunk_offset);
michael@0: 
michael@0:   DllInterceptionData dll_data;
michael@0:   dll_data.data_bytes = thunk_bytes;
michael@0:   dll_data.num_thunks = 0;
michael@0:   dll_data.used_bytes = offsetof(DllInterceptionData, thunks);
michael@0: 
michael@0:   // Reset all helpers for a new child.
michael@0:   memset(g_originals, 0, sizeof(g_originals));
michael@0: 
michael@0:   // this should write all the individual thunks to the child's memory
michael@0:   if (!PatchClientFunctions(thunks, thunk_bytes, &dll_data))
michael@0:     return false;
michael@0: 
michael@0:   // and now write the first part of the table to the child's memory
michael@0:   SIZE_T written;
michael@0:   bool ok = FALSE != ::WriteProcessMemory(child, thunks, &dll_data,
michael@0:                                           offsetof(DllInterceptionData, thunks),
michael@0:                                           &written);
michael@0: 
michael@0:   if (!ok || (offsetof(DllInterceptionData, thunks) != written))
michael@0:     return false;
michael@0: 
michael@0:   // Attempt to protect all the thunks, but ignore failure
michael@0:   DWORD old_protection;
michael@0:   ::VirtualProtectEx(child, thunks, thunk_bytes,
michael@0:                      PAGE_EXECUTE_READ, &old_protection);
michael@0: 
michael@0:   ResultCode ret = child_->TransferVariable("g_originals", g_originals,
michael@0:                                             sizeof(g_originals));
michael@0:   return (SBOX_ALL_OK == ret);
michael@0: }
michael@0: 
michael@0: bool InterceptionManager::PatchClientFunctions(DllInterceptionData* thunks,
michael@0:                                                size_t thunk_bytes,
michael@0:                                                DllInterceptionData* dll_data) {
michael@0:   DCHECK(NULL != thunks);
michael@0:   DCHECK(NULL != dll_data);
michael@0: 
michael@0:   HMODULE ntdll_base = ::GetModuleHandle(kNtdllName);
michael@0:   if (!ntdll_base)
michael@0:     return false;
michael@0: 
michael@0:   base::win::PEImage ntdll_image(ntdll_base);
michael@0: 
michael@0:   // Bypass purify's interception.
michael@0:   wchar_t* loader_get = reinterpret_cast<wchar_t*>(
michael@0:                             ntdll_image.GetProcAddress("LdrGetDllHandle"));
michael@0:   if (loader_get) {
michael@0:     if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
michael@0:                                GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
michael@0:                            loader_get, &ntdll_base))
michael@0:       return false;
michael@0:   }
michael@0: 
michael@0:   if (base::win::GetVersion() <= base::win::VERSION_VISTA) {
michael@0:     Wow64 WowHelper(child_, ntdll_base);
michael@0:     if (!WowHelper.WaitForNtdll())
michael@0:       return false;
michael@0:   }
michael@0: 
michael@0:   char* interceptor_base = NULL;
michael@0: 
michael@0: #if SANDBOX_EXPORTS
michael@0:   interceptor_base = reinterpret_cast<char*>(child_->MainModule());
michael@0:   HMODULE local_interceptor = ::LoadLibrary(child_->Name());
michael@0: #endif
michael@0: 
michael@0:   ServiceResolverThunk* thunk;
michael@0: #if defined(_WIN64)
michael@0:   thunk = new ServiceResolverThunk(child_->Process(), relaxed_);
michael@0: #else
michael@0:   base::win::OSInfo* os_info = base::win::OSInfo::GetInstance();
michael@0:   if (os_info->wow64_status() == base::win::OSInfo::WOW64_ENABLED) {
michael@0:     if (os_info->version() >= base::win::VERSION_WIN8)
michael@0:       thunk = new Wow64W8ResolverThunk(child_->Process(), relaxed_);
michael@0:     else
michael@0:       thunk = new Wow64ResolverThunk(child_->Process(), relaxed_);
michael@0:   } else if (!IsXPSP2OrLater()) {
michael@0:     thunk = new Win2kResolverThunk(child_->Process(), relaxed_);
michael@0:   } else if (os_info->version() >= base::win::VERSION_WIN8) {
michael@0:     thunk = new Win8ResolverThunk(child_->Process(), relaxed_);
michael@0:   } else {
michael@0:     thunk = new ServiceResolverThunk(child_->Process(), relaxed_);
michael@0:   }
michael@0: #endif
michael@0: 
michael@0:   std::list<InterceptionData>::iterator it = interceptions_.begin();
michael@0:   for (; it != interceptions_.end(); ++it) {
michael@0:     const std::wstring ntdll(kNtdllName);
michael@0:     if (it->dll != ntdll)
michael@0:       break;
michael@0: 
michael@0:     if (INTERCEPTION_SERVICE_CALL != it->type)
michael@0:       break;
michael@0: 
michael@0: #if SANDBOX_EXPORTS
michael@0:     // We may be trying to patch by function name.
michael@0:     if (NULL == it->interceptor_address) {
michael@0:       const char* address;
michael@0:       NTSTATUS ret = thunk->ResolveInterceptor(local_interceptor,
michael@0:                                                it->interceptor.c_str(),
michael@0:                                                reinterpret_cast<const void**>(
michael@0:                                                &address));
michael@0:       if (!NT_SUCCESS(ret))
michael@0:         break;
michael@0: 
michael@0:       // Translate the local address to an address on the child.
michael@0:       it->interceptor_address = interceptor_base + (address -
michael@0:                                     reinterpret_cast<char*>(local_interceptor));
michael@0:     }
michael@0: #endif
michael@0:     NTSTATUS ret = thunk->Setup(ntdll_base,
michael@0:                                 interceptor_base,
michael@0:                                 it->function.c_str(),
michael@0:                                 it->interceptor.c_str(),
michael@0:                                 it->interceptor_address,
michael@0:                                 &thunks->thunks[dll_data->num_thunks],
michael@0:                                 thunk_bytes - dll_data->used_bytes,
michael@0:                                 NULL);
michael@0:     if (!NT_SUCCESS(ret))
michael@0:       break;
michael@0: 
michael@0:     DCHECK(!g_originals[it->id]);
michael@0:     g_originals[it->id] = &thunks->thunks[dll_data->num_thunks];
michael@0: 
michael@0:     dll_data->num_thunks++;
michael@0:     dll_data->used_bytes += sizeof(ThunkData);
michael@0:   }
michael@0: 
michael@0:   delete(thunk);
michael@0: 
michael@0: #if SANDBOX_EXPORTS
michael@0:   if (NULL != local_interceptor)
michael@0:     ::FreeLibrary(local_interceptor);
michael@0: #endif
michael@0: 
michael@0:   if (it != interceptions_.end())
michael@0:     return false;
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: }  // namespace sandbox