├── LICENSE ├── LoaderLog.sln ├── README.md ├── LoaderLog.cpp ├── LoaderLog.vcxproj └── .gitignore /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2023 Tim Misiak 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /LoaderLog.sln: -------------------------------------------------------------------------------- 1 | 2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 17 4 | VisualStudioVersion = 17.4.33205.214 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "LoaderLog", "LoaderLog.vcxproj", "{7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|x64 = Debug|x64 11 | Debug|x86 = Debug|x86 12 | Release|x64 = Release|x64 13 | Release|x86 = Release|x86 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Debug|x64.ActiveCfg = Debug|x64 17 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Debug|x64.Build.0 = Debug|x64 18 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Debug|x86.ActiveCfg = Debug|Win32 19 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Debug|x86.Build.0 = Debug|Win32 20 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Release|x64.ActiveCfg = Release|x64 21 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Release|x64.Build.0 = Release|x64 22 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Release|x86.ActiveCfg = Release|Win32 23 | {7170F7FC-A2D5-4363-B1F0-18DE2EDC8FB7}.Release|x86.Build.0 = Release|Win32 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {13564736-127C-49AA-803F-13DAA4EB45A3} 30 | EndGlobalSection 31 | EndGlobal 32 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # LoaderLog 2 | 3 | This tool can be used to capture debug output and loader logs (also known as "show loader snaps"). This is the same information you can get from enabling "Show loader snaps" using gflags, but can be used without a full debugger attached. 4 | 5 | ## Usage 6 | 7 | ``` 8 | LoaderLog 9 | ``` 10 | 11 | This will create a `DebugLog-.txt` file in the current working directory, containing a log that looks like this: 12 | 13 | ``` 14 | Child command line is: notepad.exe 15 | Other debug event: 3 16 | Other debug event: 6 17 | 6c80:cc80 @ 516860140 - LdrpInitializeProcess - INFO: Beginning execution of notepad.exe (C:\windows\SYSTEM32\notepad.exe) 18 | Current directory: D:\git\LoaderLog\x64\Debug\ 19 | Package directories: (null) 20 | 6c80:cc80 @ 516860140 - LdrLoadDll - ENTER: DLL name: KERNEL32.DLL 21 | 6c80:cc80 @ 516860140 - LdrpLoadDllInternal - ENTER: DLL name: KERNEL32.DLL 22 | 6c80:cc80 @ 516860140 - LdrpFindKnownDll - ENTER: DLL name: KERNEL32.DLL 23 | 6c80:cc80 @ 516860140 - LdrpFindKnownDll - RETURN: Status: 0x00000000 24 | 6c80:cc80 @ 516860140 - LdrpMinimalMapModule - ENTER: DLL name: C:\windows\System32\KERNEL32.DLL 25 | Other debug event: 6 26 | 6c80:cc80 @ 516860140 - LdrpMinimalMapModule - RETURN: Status: 0x00000000 27 | 6c80:cc80 @ 516860140 - LdrpPreprocessDllName - INFO: DLL api-ms-win-core-rtlsupport-l1-1-0.dll was redirected to C:\windows\SYSTEM32\ntdll.dll by API set 28 | 6c80:cc80 @ 516860140 - LdrpFindKnownDll - ENTER: DLL name: KERNELBASE.dll 29 | 6c80:cc80 @ 516860140 - LdrpFindKnownDll - RETURN: Status: 0x00000000 30 | ... 31 | ``` 32 | 33 | LoaderLog acts uses the debugging APIs such as DEBUG_ONLY_THIS_PROCESS with WaitForDebugEvent, so it does not allow debugging the target application at the same time. 34 | 35 | You can use IFEO (Image File Execution Options) to have LoaderLog always enabled for a binary. For instance: 36 | 37 | ``` 38 | reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\dotnet.exe" /v "Debugger" /t REG_SZ /d "C:\Tools\LoaderLog.exe" 39 | ``` 40 | 41 | This tool has had minimal testing, but I used it to successfully diagnose a DLL load failure in a pipeline where I couldn't use a debugger, so I thought it might be helpful to other people as well. 42 | -------------------------------------------------------------------------------- /LoaderLog.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | 7 | // Documentation for NtQueryInformationProcess and PROCESS_BASIC_INFORMATION is: 8 | // https://learn.microsoft.com/en-us/windows/win32/api/winternl/nf-winternl-ntqueryinformationprocess 9 | using NtQueryInformationProcess_t = NTSTATUS(NTAPI* )(HANDLE ProcessHandle, int ProcessInformationClass, __out void* ProcessInformation, ULONG ProcessInformationLength, __out PULONG ReturnLength); 10 | #define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0) 11 | 12 | typedef struct _PROCESS_BASIC_INFORMATION { 13 | NTSTATUS ExitStatus; 14 | void* PebBaseAddress; 15 | ULONG_PTR AffinityMask; 16 | LONG BasePriority; 17 | ULONG_PTR UniqueProcessId; 18 | ULONG_PTR InheritedFromUniqueProcessId; 19 | } PROCESS_BASIC_INFORMATION; 20 | 21 | DWORD pid; 22 | 23 | using namespace std; 24 | 25 | wofstream logFile; 26 | 27 | void HandleDebugOutputString(const DEBUG_EVENT &dbgEvent, HANDLE hProcess) 28 | { 29 | // Don't bother with output over 4k 30 | uint8_t buffer[4096]; 31 | auto size = static_cast(min(sizeof(buffer) - 2, dbgEvent.u.DebugString.nDebugStringLength)); 32 | SIZE_T read; 33 | ReadProcessMemory(hProcess, dbgEvent.u.DebugString.lpDebugStringData, buffer, size, &read); 34 | 35 | size = static_cast(min(read, size)); 36 | buffer[size] = 0; 37 | buffer[size + 1] = 0; 38 | 39 | if (dbgEvent.u.DebugString.fUnicode) 40 | { 41 | logFile << (wchar_t*)buffer; 42 | } 43 | else 44 | { 45 | wchar_t wbuffer[4096]; 46 | auto mbRet = MultiByteToWideChar(CP_ACP, 0, (char*)buffer, size, wbuffer, ARRAYSIZE(wbuffer)); 47 | if (mbRet != 0) 48 | { 49 | logFile << wbuffer; 50 | } 51 | } 52 | } 53 | 54 | int main() 55 | { 56 | auto cmdLine = GetCommandLineW(); 57 | 58 | if (cmdLine[0] == '\"') 59 | { 60 | cmdLine++; 61 | while (*cmdLine != 0 && *cmdLine != '\"') 62 | { 63 | cmdLine++; 64 | } 65 | 66 | if (*cmdLine == '\"') 67 | { 68 | cmdLine++; 69 | } 70 | 71 | while (*cmdLine == ' ') 72 | { 73 | cmdLine++; 74 | } 75 | } 76 | else 77 | { 78 | while (*cmdLine != ' ' && *cmdLine != 0) 79 | { 80 | cmdLine++; 81 | } 82 | while (*cmdLine == ' ') 83 | { 84 | cmdLine++; 85 | } 86 | } 87 | 88 | STARTUPINFO si = { 0 }; 89 | si.cb = sizeof(STARTUPINFO); 90 | PROCESS_INFORMATION pi; 91 | BOOL ret = CreateProcessW(NULL, cmdLine, nullptr, nullptr, FALSE, DEBUG_ONLY_THIS_PROCESS, nullptr, nullptr, &si, &pi); 92 | 93 | if (ret) 94 | { 95 | pid = pi.dwProcessId; 96 | } 97 | else 98 | { 99 | // Use our own pid as a fallback. 100 | pid = GetCurrentProcessId(); 101 | } 102 | 103 | wstringstream fname; 104 | fname << L"DebugLog-" << pid << ".txt"; 105 | logFile.open(fname.str()); 106 | 107 | logFile << L"Child command line is: " << cmdLine << endl; 108 | 109 | if (!ret) 110 | { 111 | logFile << L"Error creating process: " << GetLastError() << endl; 112 | return 1; 113 | } 114 | 115 | auto hNtdll = GetModuleHandle(L"ntdll.dll"); 116 | if (hNtdll == NULL) 117 | { 118 | logFile << L"Couldn't find ntdll.dll" << endl; 119 | return 1; 120 | } 121 | 122 | auto ntQuery = (NtQueryInformationProcess_t)GetProcAddress(hNtdll, "NtQueryInformationProcess"); 123 | PROCESS_BASIC_INFORMATION pbi; 124 | ULONG len; 125 | auto status = ntQuery(pi.hProcess, 0, &pbi, sizeof(pbi), &len); 126 | if (!NT_SUCCESS(status)) 127 | { 128 | logFile << L"Couldn't find PEB of process" << endl; 129 | return 1; 130 | } 131 | 132 | uint64_t peb = (uint64_t)pbi.PebBaseAddress; 133 | 134 | // Enable loader snaps in global flags 135 | 136 | // global flags are in PEB->NtGlobalFlag, which is offset 0xBC (unsigned long). 137 | // This can be seen by dumping _PEB using windows public symbols. 138 | // 0:000> dt ntdll!_PEB NtGlobalFlag 139 | // +0x0bc NtGlobalFlag : Uint4B 140 | 141 | // SLS = flag 0x2 142 | // You can see this by using the "!gflags +sls" and see what flags change. 143 | 144 | ULONG gflags; 145 | SIZE_T actual; 146 | if (!ReadProcessMemory(pi.hProcess, (LPVOID)(peb + 0xBC), &gflags, sizeof(gflags), &actual)) 147 | { 148 | logFile << L"Couldn't read gflags" << endl; 149 | return 1; 150 | } 151 | gflags |= 0x2; 152 | if (!WriteProcessMemory(pi.hProcess, (LPVOID)(peb + 0xBC), &gflags, sizeof(gflags), &actual)) 153 | { 154 | logFile << L"Couldn't write gflags" << endl; 155 | return 1; 156 | } 157 | 158 | CloseHandle(pi.hThread); 159 | 160 | while (true) 161 | { 162 | DEBUG_EVENT dbgEvent; 163 | WaitForDebugEventEx(&dbgEvent, INFINITE); 164 | 165 | 166 | switch (dbgEvent.dwDebugEventCode) 167 | { 168 | case EXCEPTION_DEBUG_EVENT: 169 | logFile << L"Exeption event" << endl; 170 | break; 171 | case CREATE_THREAD_DEBUG_EVENT: 172 | logFile << L"Thread created" << endl; 173 | break; 174 | case CREATE_PROCESS_DEBUG_EVENT: 175 | logFile << "Process created" << endl; 176 | break; 177 | case EXIT_THREAD_DEBUG_EVENT: 178 | logFile << "Thread exited" << endl; 179 | break; 180 | case EXIT_PROCESS_DEBUG_EVENT: 181 | logFile << L"Process exited" << endl; 182 | break; 183 | case LOAD_DLL_DEBUG_EVENT: 184 | logFile << L"Dll loaded" << endl; 185 | break; 186 | case UNLOAD_DLL_DEBUG_EVENT: 187 | logFile << "Dll unloaded" << endl; 188 | break; 189 | case OUTPUT_DEBUG_STRING_EVENT: 190 | HandleDebugOutputString(dbgEvent, pi.hProcess); 191 | break; 192 | case RIP_EVENT: 193 | logFile << L"RIP event" << endl; 194 | break; 195 | } 196 | 197 | if (dbgEvent.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT) 198 | { 199 | break; 200 | } 201 | 202 | ContinueDebugEvent(dbgEvent.dwProcessId, dbgEvent.dwThreadId, DBG_EXCEPTION_NOT_HANDLED); 203 | } 204 | CloseHandle(pi.hProcess); 205 | } -------------------------------------------------------------------------------- /LoaderLog.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | Debug 14 | x64 15 | 16 | 17 | Release 18 | x64 19 | 20 | 21 | 22 | 16.0 23 | Win32Proj 24 | {7170f7fc-a2d5-4363-b1f0-18de2edc8fb7} 25 | LoaderLog 26 | 10.0 27 | 28 | 29 | 30 | Application 31 | true 32 | v143 33 | Unicode 34 | 35 | 36 | Application 37 | false 38 | v143 39 | true 40 | Unicode 41 | 42 | 43 | Application 44 | true 45 | v143 46 | Unicode 47 | 48 | 49 | Application 50 | false 51 | v143 52 | true 53 | Unicode 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 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