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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <windows.h>
#include <dbghelp.h>
#include <sstream>
#include <psapi.h>
#include "shared-libraries.h"
#include "nsWindowsHelpers.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/WindowsProcessMitigations.h"
#include "mozilla/WindowsVersion.h"
#include "nsNativeCharsetUtils.h"
#include "nsPrintfCString.h"
#include "nsReadableUtils.h"
#define CV_SIGNATURE 0x53445352 // 'SDSR'
struct CodeViewRecord70 {
uint32_t signature;
GUID pdbSignature;
uint32_t pdbAge;
// A UTF-8 string, according to
// https://github.com/Microsoft/microsoft-pdb/blob/082c5290e5aff028ae84e43affa8be717aa7af73/PDB/dbi/locator.cpp#L785
char pdbFileName[1];
};
static bool GetPdbInfo(uintptr_t aStart, nsID& aSignature, uint32_t& aAge,
char** aPdbName) {
if (!aStart) {
return false;
}
PIMAGE_DOS_HEADER dosHeader = reinterpret_cast<PIMAGE_DOS_HEADER>(aStart);
if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
return false;
}
PIMAGE_NT_HEADERS ntHeaders =
reinterpret_cast<PIMAGE_NT_HEADERS>(aStart + dosHeader->e_lfanew);
if (ntHeaders->Signature != IMAGE_NT_SIGNATURE) {
return false;
}
uint32_t relativeVirtualAddress =
ntHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG]
.VirtualAddress;
if (!relativeVirtualAddress) {
return false;
}
PIMAGE_DEBUG_DIRECTORY debugDirectory =
reinterpret_cast<PIMAGE_DEBUG_DIRECTORY>(aStart + relativeVirtualAddress);
if (!debugDirectory || debugDirectory->Type != IMAGE_DEBUG_TYPE_CODEVIEW) {
return false;
}
CodeViewRecord70* debugInfo = reinterpret_cast<CodeViewRecord70*>(
aStart + debugDirectory->AddressOfRawData);
if (!debugInfo || debugInfo->signature != CV_SIGNATURE) {
return false;
}
aAge = debugInfo->pdbAge;
GUID& pdbSignature = debugInfo->pdbSignature;
aSignature.m0 = pdbSignature.Data1;
aSignature.m1 = pdbSignature.Data2;
aSignature.m2 = pdbSignature.Data3;
memcpy(aSignature.m3, pdbSignature.Data4, sizeof(pdbSignature.Data4));
// The PDB file name could be different from module filename, so report both
// e.g. The PDB for C:\Windows\SysWOW64\ntdll.dll is wntdll.pdb
*aPdbName = debugInfo->pdbFileName;
return true;
}
static nsCString GetVersion(WCHAR* dllPath) {
DWORD infoSize = GetFileVersionInfoSizeW(dllPath, nullptr);
if (infoSize == 0) {
return ""_ns;
}
mozilla::UniquePtr<unsigned char[]> infoData =
mozilla::MakeUnique<unsigned char[]>(infoSize);
if (!GetFileVersionInfoW(dllPath, 0, infoSize, infoData.get())) {
return ""_ns;
}
VS_FIXEDFILEINFO* vInfo;
UINT vInfoLen;
if (!VerQueryValueW(infoData.get(), L"\\", (LPVOID*)&vInfo, &vInfoLen)) {
return ""_ns;
}
if (!vInfo) {
return ""_ns;
}
nsPrintfCString version("%d.%d.%d.%d", vInfo->dwFileVersionMS >> 16,
vInfo->dwFileVersionMS & 0xFFFF,
vInfo->dwFileVersionLS >> 16,
vInfo->dwFileVersionLS & 0xFFFF);
return std::move(version);
}
SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf() {
SharedLibraryInfo sharedLibraryInfo;
HANDLE hProcess = GetCurrentProcess();
mozilla::UniquePtr<HMODULE[]> hMods;
size_t modulesNum = 0;
if (hProcess != NULL) {
DWORD modulesSize;
if (!EnumProcessModules(hProcess, nullptr, 0, &modulesSize)) {
return sharedLibraryInfo;
}
modulesNum = modulesSize / sizeof(HMODULE);
hMods = mozilla::MakeUnique<HMODULE[]>(modulesNum);
if (!EnumProcessModules(hProcess, hMods.get(), modulesNum * sizeof(HMODULE),
&modulesSize)) {
return sharedLibraryInfo;
}
// The list may have shrunk between calls
if (modulesSize / sizeof(HMODULE) < modulesNum) {
modulesNum = modulesSize / sizeof(HMODULE);
}
}
for (unsigned int i = 0; i < modulesNum; i++) {
WCHAR modulePath[MAX_PATH + 1];
if (!GetModuleFileNameEx(hProcess, hMods[i], modulePath,
sizeof(modulePath) / sizeof(WCHAR))) {
continue;
}
MODULEINFO module = {0};
if (!GetModuleInformation(hProcess, hMods[i], &module,
sizeof(MODULEINFO))) {
continue;
}
nsAutoString modulePathStr(modulePath);
nsAutoString moduleNameStr = modulePathStr;
int32_t pos = moduleNameStr.RFindCharInSet(u"\\/");
if (pos != kNotFound) {
moduleNameStr.Cut(0, pos + 1);
}
// Hackaround for Bug 1607574. Nvidia's shim driver nvd3d9wrap[x].dll
// detours LoadLibraryExW when it's loaded and the detour function causes
// AV when the code tries to access data pointing to an address within
// unloaded nvinit[x].dll.
// The crashing code is executed when a given parameter is "detoured.dll"
// and OS version is older than 6.2. We hit that crash at the following
// call to LoadLibraryEx even if we specify LOAD_LIBRARY_AS_DATAFILE.
// We work around it by skipping LoadLibraryEx, and add a library info with
// a dummy breakpad id instead.
#if !defined(_M_ARM64)
# if defined(_M_AMD64)
LPCWSTR kNvidiaShimDriver = L"nvd3d9wrapx.dll";
LPCWSTR kNvidiaInitDriver = L"nvinitx.dll";
# elif defined(_M_IX86)
LPCWSTR kNvidiaShimDriver = L"nvd3d9wrap.dll";
LPCWSTR kNvidiaInitDriver = L"nvinit.dll";
# endif
if (moduleNameStr.LowerCaseEqualsLiteral("detoured.dll") &&
!mozilla::IsWin8OrLater() && ::GetModuleHandle(kNvidiaShimDriver) &&
!::GetModuleHandle(kNvidiaInitDriver)) {
constexpr auto pdbNameStr = u"detoured.pdb"_ns;
SharedLibrary shlib((uintptr_t)module.lpBaseOfDll,
(uintptr_t)module.lpBaseOfDll + module.SizeOfImage,
0, // DLLs are always mapped at offset 0 on Windows
"000000000000000000000000000000000"_ns, moduleNameStr,
modulePathStr, pdbNameStr, pdbNameStr, ""_ns, "");
sharedLibraryInfo.AddSharedLibrary(shlib);
continue;
}
#endif // !defined(_M_ARM64)
// If EAF+ is enabled, parsing ntdll's PE header via GetPdbInfo() causes
// a crash. We don't include PDB information in SharedLibrary.
bool canGetPdbInfo = (!mozilla::IsEafPlusEnabled() ||
!moduleNameStr.LowerCaseEqualsLiteral("ntdll.dll"));
nsCString breakpadId;
// Load the module again to make sure that its handle will remain
// valid as we attempt to read the PDB information from it. We load the
// DLL as a datafile so that if the module actually gets unloaded between
// the call to EnumProcessModules and the following LoadLibraryEx, we don't
// end up running the now newly loaded module's DllMain function. If the
// module is already loaded, LoadLibraryEx just increments its refcount.
//
// Note that because of the race condition above, merely loading the DLL
// again is not safe enough, therefore we also need to make sure that we
// can read the memory mapped at the base address before we can safely
// proceed to actually access those pages.
HMODULE handleLock =
LoadLibraryEx(modulePath, NULL, LOAD_LIBRARY_AS_DATAFILE);
MEMORY_BASIC_INFORMATION vmemInfo = {0};
nsID pdbSig;
uint32_t pdbAge;
nsAutoString pdbPathStr;
nsAutoString pdbNameStr;
char* pdbName = nullptr;
if (handleLock &&
sizeof(vmemInfo) ==
VirtualQuery(module.lpBaseOfDll, &vmemInfo, sizeof(vmemInfo)) &&
vmemInfo.State == MEM_COMMIT && canGetPdbInfo &&
GetPdbInfo((uintptr_t)module.lpBaseOfDll, pdbSig, pdbAge, &pdbName)) {
MOZ_ASSERT(breakpadId.IsEmpty());
breakpadId.AppendPrintf(
"%08X" // m0
"%04X%04X" // m1,m2
"%02X%02X%02X%02X%02X%02X%02X%02X" // m3
"%X", // pdbAge
pdbSig.m0, pdbSig.m1, pdbSig.m2, pdbSig.m3[0], pdbSig.m3[1],
pdbSig.m3[2], pdbSig.m3[3], pdbSig.m3[4], pdbSig.m3[5], pdbSig.m3[6],
pdbSig.m3[7], pdbAge);
pdbPathStr = NS_ConvertUTF8toUTF16(pdbName);
pdbNameStr = pdbPathStr;
int32_t pos = pdbNameStr.RFindCharInSet(u"\\/");
if (pos != kNotFound) {
pdbNameStr.Cut(0, pos + 1);
}
}
SharedLibrary shlib((uintptr_t)module.lpBaseOfDll,
(uintptr_t)module.lpBaseOfDll + module.SizeOfImage,
0, // DLLs are always mapped at offset 0 on Windows
breakpadId, moduleNameStr, modulePathStr, pdbNameStr,
pdbPathStr, GetVersion(modulePath), "");
sharedLibraryInfo.AddSharedLibrary(shlib);
FreeLibrary(handleLock); // ok to free null handles
}
return sharedLibraryInfo;
}
void SharedLibraryInfo::Initialize() { /* do nothing */
}
|
