1 // Copyright (c) 2006-2010 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 // Defines InterceptionManager, the class in charge of setting up interceptions 6 // for the sandboxed process. For more details see: 7 // http://dev.chromium.org/developers/design-documents/sandbox . 8 9 #ifndef SANDBOX_SRC_INTERCEPTION_INTERNAL_H_ 10 #define SANDBOX_SRC_INTERCEPTION_INTERNAL_H_ 11 12 #include <stddef.h> 13 14 #include "sandbox/win/src/sandbox_types.h" 15 16 namespace sandbox { 17 18 const int kMaxThunkDataBytes = 64; 19 20 enum InterceptorId; 21 22 // The following structures contain variable size fields at the end, and will be 23 // used to transfer information between two processes. In order to guarantee 24 // our ability to follow the chain of structures, the alignment should be fixed, 25 // hence this pragma. 26 #pragma pack(push, 4) 27 28 // Structures for the shared memory that contains patching information 29 // for the InterceptionAgent. 30 // A single interception: 31 struct FunctionInfo { 32 size_t record_bytes; // rounded to sizeof(size_t) bytes 33 InterceptionType type; 34 InterceptorId id; 35 const void* interceptor_address; 36 char function[1]; // placeholder for null terminated name 37 // char interceptor[] // followed by the interceptor function 38 }; 39 40 // A single dll: 41 struct DllPatchInfo { 42 size_t record_bytes; // rounded to sizeof(size_t) bytes 43 size_t offset_to_functions; 44 int num_functions; 45 bool unload_module; 46 wchar_t dll_name[1]; // placeholder for null terminated name 47 // FunctionInfo function_info[] // followed by the functions to intercept 48 }; 49 50 // All interceptions: 51 struct SharedMemory { 52 int num_intercepted_dlls; 53 void* interceptor_base; 54 DllPatchInfo dll_list[1]; // placeholder for the list of dlls 55 }; 56 57 // Dummy single thunk: 58 struct ThunkData { 59 char data[kMaxThunkDataBytes]; 60 }; 61 62 // In-memory representation of the interceptions for a given dll: 63 struct DllInterceptionData { 64 size_t data_bytes; 65 size_t used_bytes; 66 void* base; 67 int num_thunks; 68 #if defined(_WIN64) 69 int dummy; // Improve alignment. 70 #endif 71 ThunkData thunks[1]; 72 }; 73 74 #pragma pack(pop) 75 76 } // namespace sandbox 77 78 #endif // SANDBOX_SRC_INTERCEPTION_INTERNAL_H_ 79