1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#if defined(_WIN32)
#pragma comment(lib, "swiftCore.lib")
#include "../SwiftInspectClientInterface/SwiftInspectClientInterface.h"
#include <assert.h>
#include <memory>
#include <stdio.h>
#include <strsafe.h>
#include <vector>
#include <windows.h>
namespace {
struct ScopedHandle {
HANDLE Handle;
explicit ScopedHandle(HANDLE Handle) noexcept : Handle(Handle) {}
~ScopedHandle() noexcept {
if (Handle != NULL && Handle != INVALID_HANDLE_VALUE) {
CloseHandle(Handle);
}
}
operator HANDLE() const { return Handle; }
};
struct ScopedViewOfFile {
void *View;
explicit ScopedViewOfFile(void *View) noexcept : View(View) {}
~ScopedViewOfFile() noexcept {
if (View != NULL) {
UnmapViewOfFile(View);
}
}
void *get() const { return View; }
template <typename T> T *as() const { return reinterpret_cast<T *>(View); }
};
struct ScopedHeapLock {
HANDLE Heap;
bool Failure = false;
explicit ScopedHeapLock(HANDLE Heap) noexcept : Heap(Heap) {
if (!HeapLock(Heap)) {
OutputDebugStringA("Failed to lock heap\n");
Failure = true;
}
}
~ScopedHeapLock() noexcept {
if (Heap != NULL && !Failure) {
if (!HeapUnlock(Heap)) {
OutputDebugStringA("Failed to lock heap\n");
}
}
}
};
} // anonymous namespace
#define BUF_NUM_ENTRIES (BUF_SIZE / sizeof(HeapEntry))
static int heapWalk() {
// Format the shared mem and event object names
DWORD Pid = GetCurrentProcessId();
char SharedMemName[128];
char ReadEventName[128];
char WriteEventName[128];
if (StringCbPrintfA(SharedMemName, sizeof(SharedMemName), "%hS-%lu",
SHARED_MEM_NAME_PREFIX, Pid) != S_OK) {
OutputDebugStringA("StringCbPrintfA for SharedMemName failed\n");
return 1;
}
if (StringCbPrintfA(ReadEventName, sizeof(ReadEventName), "%hS-%lu",
READ_EVENT_NAME_PREFIX, Pid) != S_OK) {
OutputDebugStringA("StringCbPrintfA for ReadEventName failed\n");
return 1;
}
if (StringCbPrintfA(WriteEventName, sizeof(WriteEventName), "%hS-%lu",
WRITE_EVENT_NAME_PREFIX, Pid) != S_OK) {
OutputDebugStringA("StringCbPrintfA for WriteEventName failed\n");
return 1;
}
ScopedHandle MapFile(
OpenFileMappingA(FILE_MAP_ALL_ACCESS, false, SharedMemName));
if (MapFile == NULL) {
OutputDebugStringA("OpenFileMapping failed\n");
return 1;
}
ScopedViewOfFile Buf(
MapViewOfFile(MapFile.Handle, FILE_MAP_ALL_ACCESS, 0, 0, BUF_SIZE));
if (Buf.get() == NULL) {
OutputDebugStringA("MapViewOfFile failed\n");
return 1;
}
std::memset(Buf.get(), 0, BUF_SIZE);
ScopedHandle WriteEvent(OpenEventA(EVENT_ALL_ACCESS, false, WriteEventName));
if (WriteEvent == NULL) {
OutputDebugStringA("OpenEventA failed\n");
return 1;
}
ScopedHandle ReadEvent(OpenEventA(EVENT_ALL_ACCESS, false, ReadEventName));
if (ReadEvent == NULL) {
OutputDebugStringA("OpenEventA failed\n");
return 1;
}
// Collect heaps. This is a loop because GetProcessHeaps requires
// specifying the max number of heaps to get upfront.
std::vector<HANDLE> Heaps;
while (TRUE) {
DWORD ActualHeapCount = GetProcessHeaps(Heaps.size(), Heaps.data());
if (ActualHeapCount <= Heaps.size()) {
Heaps.resize(ActualHeapCount);
break;
}
Heaps.resize(ActualHeapCount);
}
// Iterate heaps and heap entries
size_t Count = 0;
for (HANDLE Heap : Heaps) {
PROCESS_HEAP_ENTRY Entry;
// NOTE: Be careful not to reenter the heap lock while holding the
// heap lock or else it would hang.
ScopedHeapLock HeapLock(Heap);
if (HeapLock.Failure) {
continue;
}
Entry.lpData = NULL;
while (HeapWalk(Heap, &Entry)) {
if ((Entry.wFlags & PROCESS_HEAP_REGION) ||
(Entry.wFlags & PROCESS_HEAP_UNCOMMITTED_RANGE) ||
(!(Entry.wFlags & PROCESS_HEAP_ENTRY_BUSY))) {
continue;
}
assert(Count < BUF_NUM_ENTRIES);
Buf.as<HeapEntry>()[Count] = {
reinterpret_cast<uintptr_t>(Entry.lpData),
Entry.cbData + Entry.cbOverhead
};
if (++Count == BUF_NUM_ENTRIES) {
if (!SetEvent(ReadEvent)) {
OutputDebugStringA("SetEvent on ReadEvent failed\n");
return 1;
}
DWORD Wait = WaitForSingleObject(WriteEvent, WAIT_TIMEOUT_MS);
if (Wait != WAIT_OBJECT_0) {
char Msg[128];
if (StringCbPrintfA(Msg, sizeof(Msg),
"WaitForSingleObject failed %lu\n",
Wait) == S_OK) {
OutputDebugStringA(Msg);
}
return 1;
}
std::memset(Buf.get(), 0, BUF_SIZE);
Count = 0;
}
}
if (Count > 0) {
// Write the remaining entries.
if (!SetEvent(ReadEvent)) {
OutputDebugStringA("SetEvent on ReadEvent failed\n");
return 1;
}
DWORD Wait = WaitForSingleObject(WriteEvent, WAIT_TIMEOUT_MS);
if (Wait != WAIT_OBJECT_0) {
char Msg[128];
if (StringCbPrintfA(Msg, sizeof(Msg),
"WaitForSingleObject failed %lu\n", Wait) == S_OK) {
OutputDebugStringA(Msg);
}
return 1;
}
std::memset(Buf.get(), 0, BUF_SIZE);
Count = 0;
}
}
// Indicate the end of iteration with one last write.
std::memset(Buf.get(), 0, BUF_SIZE);
Buf.as<HeapEntry>()[0].Address = -1;
if (!SetEvent(ReadEvent)) {
OutputDebugStringA("SetEvent at the end of heap iteration failed\n");
return 1;
}
DWORD Wait = WaitForSingleObject(WriteEvent, WAIT_TIMEOUT_MS);
if (Wait != WAIT_OBJECT_0) {
char Msg[128];
if (StringCbPrintfA(Msg, sizeof(Msg), "WaitForSingleObject failed %lu\n",
Wait) == S_OK) {
OutputDebugStringA(Msg);
}
return 1;
}
return 0;
}
BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call,
LPVOID lpReserved) {
if (ul_reason_for_call == DLL_PROCESS_ATTACH) {
heapWalk();
}
return TRUE;
}
#endif
|
