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| 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 #include "sandbox/win/src/resolver.h" | |
| 6 | |
| 7 #include <stddef.h> | |
| 8 | |
| 9 // For placement new. This file must not depend on the CRT at runtime, but | |
| 10 // placement operator new is inline. | |
| 11 #include <new> | |
| 12 | |
| 13 #include "sandbox/win/src/sandbox_nt_util.h" | |
| 14 | |
| 15 namespace { | |
| 16 | |
| 17 const USHORT kMovRax = 0xB848; | |
| 18 const USHORT kJmpRax = 0xe0ff; | |
| 19 | |
| 20 #pragma pack(push, 1) | |
| 21 struct InternalThunk { | |
| 22 // This struct contains roughly the following code: | |
| 23 // 01 48b8f0debc9a78563412 mov rax,123456789ABCDEF0h | |
| 24 // ff e0 jmp rax | |
| 25 // | |
| 26 // The code modifies rax, but that's fine for x64 ABI. | |
| 27 | |
| 28 InternalThunk() { | |
| 29 mov_rax = kMovRax; | |
| 30 jmp_rax = kJmpRax; | |
| 31 interceptor_function = 0; | |
| 32 }; | |
| 33 USHORT mov_rax; // = 48 B8 | |
| 34 ULONG_PTR interceptor_function; | |
| 35 USHORT jmp_rax; // = ff e0 | |
| 36 }; | |
| 37 #pragma pack(pop) | |
| 38 | |
| 39 } // namespace. | |
| 40 | |
| 41 namespace sandbox { | |
| 42 | |
| 43 size_t ResolverThunk::GetInternalThunkSize() const { | |
| 44 return sizeof(InternalThunk); | |
| 45 } | |
| 46 | |
| 47 bool ResolverThunk::SetInternalThunk(void* storage, size_t storage_bytes, | |
| 48 const void* original_function, | |
| 49 const void* interceptor) { | |
| 50 if (storage_bytes < sizeof(InternalThunk)) | |
| 51 return false; | |
| 52 | |
| 53 InternalThunk* thunk = new(storage) InternalThunk; | |
| 54 thunk->interceptor_function = reinterpret_cast<ULONG_PTR>(interceptor); | |
| 55 | |
| 56 return true; | |
| 57 } | |
| 58 | |
| 59 NTSTATUS ResolverThunk::ResolveTarget(const void* module, | |
| 60 const char* function_name, | |
| 61 void** address) { | |
| 62 // We don't support sidestep & co. | |
| 63 return STATUS_NOT_IMPLEMENTED; | |
| 64 } | |
| 65 | |
| 66 } // namespace sandbox | |
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