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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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