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llvm-mirror/utils/KillTheDoctor/KillTheDoctor.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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19 KiB
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//===- KillTheDoctor - Prevent Dr. Watson from stopping tests ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This program provides an extremely hacky way to stop Dr. Watson from starting
// due to unhandled exceptions in child processes.
//
// This simply starts the program named in the first positional argument with
// the arguments following it under a debugger. All this debugger does is catch
// any unhandled exceptions thrown in the child process and close the program
// (and hopefully tells someone about it).
//
// This also provides another really hacky method to prevent assert dialog boxes
// from popping up. When --no-user32 is passed, if any process loads user32.dll,
// we assume it is trying to call MessageBoxEx and terminate it. The proper way
// to do this would be to actually set a break point, but there's quite a bit
// of code involved to get the address of MessageBoxEx in the remote process's
// address space due to Address space layout randomization (ASLR). This can be
// added if it's ever actually needed.
//
// If the subprocess exits for any reason other than successful termination, -1
// is returned. If the process exits normally the value it returned is returned.
//
// I hate Windows.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/WindowsError.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/type_traits.h"
#include <algorithm>
#include <cerrno>
#include <cstdlib>
#include <map>
#include <string>
#include <system_error>
// These includes must be last.
#include <windows.h>
#include <winerror.h>
#include <dbghelp.h>
#include <psapi.h>
using namespace llvm;
#undef max
namespace {
cl::opt<std::string> ProgramToRun(cl::Positional,
cl::desc("<program to run>"));
cl::list<std::string> Argv(cl::ConsumeAfter,
cl::desc("<program arguments>..."));
cl::opt<bool> TraceExecution("x",
cl::desc("Print detailed output about what is being run to stderr."));
cl::opt<unsigned> Timeout("t", cl::init(0),
cl::desc("Set maximum runtime in seconds. Defaults to infinite."));
cl::opt<bool> NoUser32("no-user32",
cl::desc("Terminate process if it loads user32.dll."));
StringRef ToolName;
template <typename HandleType>
class ScopedHandle {
typedef typename HandleType::handle_type handle_type;
handle_type Handle;
public:
ScopedHandle()
: Handle(HandleType::GetInvalidHandle()) {}
explicit ScopedHandle(handle_type handle)
: Handle(handle) {}
~ScopedHandle() {
HandleType::Destruct(Handle);
}
ScopedHandle& operator=(handle_type handle) {
// Cleanup current handle.
if (!HandleType::isValid(Handle))
HandleType::Destruct(Handle);
Handle = handle;
return *this;
}
operator bool() const {
return HandleType::isValid(Handle);
}
operator handle_type() {
return Handle;
}
};
// This implements the most common handle in the Windows API.
struct CommonHandle {
typedef HANDLE handle_type;
static handle_type GetInvalidHandle() {
return INVALID_HANDLE_VALUE;
}
static void Destruct(handle_type Handle) {
::CloseHandle(Handle);
}
static bool isValid(handle_type Handle) {
return Handle != GetInvalidHandle();
}
};
struct FileMappingHandle {
typedef HANDLE handle_type;
static handle_type GetInvalidHandle() {
return NULL;
}
static void Destruct(handle_type Handle) {
::CloseHandle(Handle);
}
static bool isValid(handle_type Handle) {
return Handle != GetInvalidHandle();
}
};
struct MappedViewOfFileHandle {
typedef LPVOID handle_type;
static handle_type GetInvalidHandle() {
return NULL;
}
static void Destruct(handle_type Handle) {
::UnmapViewOfFile(Handle);
}
static bool isValid(handle_type Handle) {
return Handle != GetInvalidHandle();
}
};
struct ProcessHandle : CommonHandle {};
struct ThreadHandle : CommonHandle {};
struct TokenHandle : CommonHandle {};
struct FileHandle : CommonHandle {};
typedef ScopedHandle<FileMappingHandle> FileMappingScopedHandle;
typedef ScopedHandle<MappedViewOfFileHandle> MappedViewOfFileScopedHandle;
typedef ScopedHandle<ProcessHandle> ProcessScopedHandle;
typedef ScopedHandle<ThreadHandle> ThreadScopedHandle;
typedef ScopedHandle<TokenHandle> TokenScopedHandle;
typedef ScopedHandle<FileHandle> FileScopedHandle;
}
static std::error_code windows_error(DWORD E) { return mapWindowsError(E); }
static std::error_code GetFileNameFromHandle(HANDLE FileHandle,
std::string &Name) {
char Filename[MAX_PATH+1];
bool Success = false;
Name.clear();
// Get the file size.
LARGE_INTEGER FileSize;
Success = ::GetFileSizeEx(FileHandle, &FileSize);
if (!Success)
return windows_error(::GetLastError());
// Create a file mapping object.
FileMappingScopedHandle FileMapping(
::CreateFileMappingA(FileHandle,
NULL,
PAGE_READONLY,
0,
1,
NULL));
if (!FileMapping)
return windows_error(::GetLastError());
// Create a file mapping to get the file name.
MappedViewOfFileScopedHandle MappedFile(
::MapViewOfFile(FileMapping, FILE_MAP_READ, 0, 0, 1));
if (!MappedFile)
return windows_error(::GetLastError());
Success = ::GetMappedFileNameA(::GetCurrentProcess(),
MappedFile,
Filename,
array_lengthof(Filename) - 1);
if (!Success)
return windows_error(::GetLastError());
else {
Name = Filename;
return std::error_code();
}
}
/// Find program using shell lookup rules.
/// @param Program This is either an absolute path, relative path, or simple a
/// program name. Look in PATH for any programs that match. If no
/// extension is present, try all extensions in PATHEXT.
/// @return If ec == errc::success, The absolute path to the program. Otherwise
/// the return value is undefined.
static std::string FindProgram(const std::string &Program,
std::error_code &ec) {
char PathName[MAX_PATH + 1];
typedef SmallVector<StringRef, 12> pathext_t;
pathext_t pathext;
// Check for the program without an extension (in case it already has one).
pathext.push_back("");
SplitString(std::getenv("PATHEXT"), pathext, ";");
for (pathext_t::iterator i = pathext.begin(), e = pathext.end(); i != e; ++i){
SmallString<5> ext;
for (std::size_t ii = 0, e = i->size(); ii != e; ++ii)
ext.push_back(::tolower((*i)[ii]));
LPCSTR Extension = NULL;
if (ext.size() && ext[0] == '.')
Extension = ext.c_str();
DWORD length = ::SearchPathA(NULL,
Program.c_str(),
Extension,
array_lengthof(PathName),
PathName,
NULL);
if (length == 0)
ec = windows_error(::GetLastError());
else if (length > array_lengthof(PathName)) {
// This may have been the file, return with error.
ec = windows_error(ERROR_BUFFER_OVERFLOW);
break;
} else {
// We found the path! Return it.
ec = std::error_code();
break;
}
}
// Make sure PathName is valid.
PathName[MAX_PATH] = 0;
return PathName;
}
static StringRef ExceptionCodeToString(DWORD ExceptionCode) {
switch(ExceptionCode) {
case EXCEPTION_ACCESS_VIOLATION: return "EXCEPTION_ACCESS_VIOLATION";
case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
return "EXCEPTION_ARRAY_BOUNDS_EXCEEDED";
case EXCEPTION_BREAKPOINT: return "EXCEPTION_BREAKPOINT";
case EXCEPTION_DATATYPE_MISALIGNMENT:
return "EXCEPTION_DATATYPE_MISALIGNMENT";
case EXCEPTION_FLT_DENORMAL_OPERAND: return "EXCEPTION_FLT_DENORMAL_OPERAND";
case EXCEPTION_FLT_DIVIDE_BY_ZERO: return "EXCEPTION_FLT_DIVIDE_BY_ZERO";
case EXCEPTION_FLT_INEXACT_RESULT: return "EXCEPTION_FLT_INEXACT_RESULT";
case EXCEPTION_FLT_INVALID_OPERATION:
return "EXCEPTION_FLT_INVALID_OPERATION";
case EXCEPTION_FLT_OVERFLOW: return "EXCEPTION_FLT_OVERFLOW";
case EXCEPTION_FLT_STACK_CHECK: return "EXCEPTION_FLT_STACK_CHECK";
case EXCEPTION_FLT_UNDERFLOW: return "EXCEPTION_FLT_UNDERFLOW";
case EXCEPTION_ILLEGAL_INSTRUCTION: return "EXCEPTION_ILLEGAL_INSTRUCTION";
case EXCEPTION_IN_PAGE_ERROR: return "EXCEPTION_IN_PAGE_ERROR";
case EXCEPTION_INT_DIVIDE_BY_ZERO: return "EXCEPTION_INT_DIVIDE_BY_ZERO";
case EXCEPTION_INT_OVERFLOW: return "EXCEPTION_INT_OVERFLOW";
case EXCEPTION_INVALID_DISPOSITION: return "EXCEPTION_INVALID_DISPOSITION";
case EXCEPTION_NONCONTINUABLE_EXCEPTION:
return "EXCEPTION_NONCONTINUABLE_EXCEPTION";
case EXCEPTION_PRIV_INSTRUCTION: return "EXCEPTION_PRIV_INSTRUCTION";
case EXCEPTION_SINGLE_STEP: return "EXCEPTION_SINGLE_STEP";
case EXCEPTION_STACK_OVERFLOW: return "EXCEPTION_STACK_OVERFLOW";
default: return "<unknown>";
}
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal(argv[0]);
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
ToolName = argv[0];
cl::ParseCommandLineOptions(argc, argv, "Dr. Watson Assassin.\n");
if (ProgramToRun.size() == 0) {
cl::PrintHelpMessage();
return -1;
}
if (Timeout > std::numeric_limits<uint32_t>::max() / 1000) {
errs() << ToolName << ": Timeout value too large, must be less than: "
<< std::numeric_limits<uint32_t>::max() / 1000
<< '\n';
return -1;
}
std::string CommandLine(ProgramToRun);
std::error_code ec;
ProgramToRun = FindProgram(ProgramToRun, ec);
if (ec) {
errs() << ToolName << ": Failed to find program: '" << CommandLine
<< "': " << ec.message() << '\n';
return -1;
}
if (TraceExecution)
errs() << ToolName << ": Found Program: " << ProgramToRun << '\n';
for (const std::string &Arg : Argv) {
CommandLine.push_back(' ');
CommandLine.append(Arg);
}
if (TraceExecution)
errs() << ToolName << ": Program Image Path: " << ProgramToRun << '\n'
<< ToolName << ": Command Line: " << CommandLine << '\n';
STARTUPINFOA StartupInfo;
PROCESS_INFORMATION ProcessInfo;
std::memset(&StartupInfo, 0, sizeof(StartupInfo));
StartupInfo.cb = sizeof(StartupInfo);
std::memset(&ProcessInfo, 0, sizeof(ProcessInfo));
// Set error mode to not display any message boxes. The child process inherits
// this.
::SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX);
::_set_error_mode(_OUT_TO_STDERR);
BOOL success = ::CreateProcessA(ProgramToRun.c_str(),
const_cast<LPSTR>(CommandLine.c_str()),
NULL,
NULL,
FALSE,
DEBUG_PROCESS,
NULL,
NULL,
&StartupInfo,
&ProcessInfo);
if (!success) {
errs() << ToolName << ": Failed to run program: '" << ProgramToRun << "': "
<< std::error_code(windows_error(::GetLastError())).message()
<< '\n';
return -1;
}
// Make sure ::CloseHandle is called on exit.
std::map<DWORD, HANDLE> ProcessIDToHandle;
DEBUG_EVENT DebugEvent;
std::memset(&DebugEvent, 0, sizeof(DebugEvent));
DWORD dwContinueStatus = DBG_CONTINUE;
// Run the program under the debugger until either it exits, or throws an
// exception.
if (TraceExecution)
errs() << ToolName << ": Debugging...\n";
while(true) {
DWORD TimeLeft = INFINITE;
if (Timeout > 0) {
FILETIME CreationTime, ExitTime, KernelTime, UserTime;
ULARGE_INTEGER a, b;
success = ::GetProcessTimes(ProcessInfo.hProcess,
&CreationTime,
&ExitTime,
&KernelTime,
&UserTime);
if (!success) {
ec = windows_error(::GetLastError());
errs() << ToolName << ": Failed to get process times: "
<< ec.message() << '\n';
return -1;
}
a.LowPart = KernelTime.dwLowDateTime;
a.HighPart = KernelTime.dwHighDateTime;
b.LowPart = UserTime.dwLowDateTime;
b.HighPart = UserTime.dwHighDateTime;
// Convert 100-nanosecond units to milliseconds.
uint64_t TotalTimeMiliseconds = (a.QuadPart + b.QuadPart) / 10000;
// Handle the case where the process has been running for more than 49
// days.
if (TotalTimeMiliseconds > std::numeric_limits<uint32_t>::max()) {
errs() << ToolName << ": Timeout Failed: Process has been running for"
"more than 49 days.\n";
return -1;
}
// We check with > instead of using Timeleft because if
// TotalTimeMiliseconds is greater than Timeout * 1000, TimeLeft would
// underflow.
if (TotalTimeMiliseconds > (Timeout * 1000)) {
errs() << ToolName << ": Process timed out.\n";
::TerminateProcess(ProcessInfo.hProcess, -1);
// Otherwise other stuff starts failing...
return -1;
}
TimeLeft = (Timeout * 1000) - static_cast<uint32_t>(TotalTimeMiliseconds);
}
success = WaitForDebugEvent(&DebugEvent, TimeLeft);
if (!success) {
DWORD LastError = ::GetLastError();
ec = windows_error(LastError);
if (LastError == ERROR_SEM_TIMEOUT || LastError == WSAETIMEDOUT) {
errs() << ToolName << ": Process timed out.\n";
::TerminateProcess(ProcessInfo.hProcess, -1);
// Otherwise other stuff starts failing...
return -1;
}
errs() << ToolName << ": Failed to wait for debug event in program: '"
<< ProgramToRun << "': " << ec.message() << '\n';
return -1;
}
switch(DebugEvent.dwDebugEventCode) {
case CREATE_PROCESS_DEBUG_EVENT:
// Make sure we remove the handle on exit.
if (TraceExecution)
errs() << ToolName << ": Debug Event: CREATE_PROCESS_DEBUG_EVENT\n";
ProcessIDToHandle[DebugEvent.dwProcessId] =
DebugEvent.u.CreateProcessInfo.hProcess;
::CloseHandle(DebugEvent.u.CreateProcessInfo.hFile);
break;
case EXIT_PROCESS_DEBUG_EVENT: {
if (TraceExecution)
errs() << ToolName << ": Debug Event: EXIT_PROCESS_DEBUG_EVENT\n";
// If this is the process we originally created, exit with its exit
// code.
if (DebugEvent.dwProcessId == ProcessInfo.dwProcessId)
return DebugEvent.u.ExitProcess.dwExitCode;
// Otherwise cleanup any resources we have for it.
std::map<DWORD, HANDLE>::iterator ExitingProcess =
ProcessIDToHandle.find(DebugEvent.dwProcessId);
if (ExitingProcess == ProcessIDToHandle.end()) {
errs() << ToolName << ": Got unknown process id!\n";
return -1;
}
::CloseHandle(ExitingProcess->second);
ProcessIDToHandle.erase(ExitingProcess);
}
break;
case CREATE_THREAD_DEBUG_EVENT:
::CloseHandle(DebugEvent.u.CreateThread.hThread);
break;
case LOAD_DLL_DEBUG_EVENT: {
// Cleanup the file handle.
FileScopedHandle DLLFile(DebugEvent.u.LoadDll.hFile);
std::string DLLName;
ec = GetFileNameFromHandle(DLLFile, DLLName);
if (ec) {
DLLName = "<failed to get file name from file handle> : ";
DLLName += ec.message();
}
if (TraceExecution) {
errs() << ToolName << ": Debug Event: LOAD_DLL_DEBUG_EVENT\n";
errs().indent(ToolName.size()) << ": DLL Name : " << DLLName << '\n';
}
if (NoUser32 && sys::path::stem(DLLName) == "user32") {
// Program is loading user32.dll, in the applications we are testing,
// this only happens if an assert has fired. By now the message has
// already been printed, so simply close the program.
errs() << ToolName << ": user32.dll loaded!\n";
errs().indent(ToolName.size())
<< ": This probably means that assert was called. Closing "
"program to prevent message box from popping up.\n";
dwContinueStatus = DBG_CONTINUE;
::TerminateProcess(ProcessIDToHandle[DebugEvent.dwProcessId], -1);
return -1;
}
}
break;
case EXCEPTION_DEBUG_EVENT: {
// Close the application if this exception will not be handled by the
// child application.
if (TraceExecution)
errs() << ToolName << ": Debug Event: EXCEPTION_DEBUG_EVENT\n";
EXCEPTION_DEBUG_INFO &Exception = DebugEvent.u.Exception;
if (Exception.dwFirstChance > 0) {
if (TraceExecution) {
errs().indent(ToolName.size()) << ": Debug Info : ";
errs() << "First chance exception at "
<< Exception.ExceptionRecord.ExceptionAddress
<< ", exception code: "
<< ExceptionCodeToString(
Exception.ExceptionRecord.ExceptionCode)
<< " (" << Exception.ExceptionRecord.ExceptionCode << ")\n";
}
dwContinueStatus = DBG_EXCEPTION_NOT_HANDLED;
} else {
errs() << ToolName << ": Unhandled exception in: " << ProgramToRun
<< "!\n";
errs().indent(ToolName.size()) << ": location: ";
errs() << Exception.ExceptionRecord.ExceptionAddress
<< ", exception code: "
<< ExceptionCodeToString(
Exception.ExceptionRecord.ExceptionCode)
<< " (" << Exception.ExceptionRecord.ExceptionCode
<< ")\n";
dwContinueStatus = DBG_CONTINUE;
::TerminateProcess(ProcessIDToHandle[DebugEvent.dwProcessId], -1);
return -1;
}
}
break;
default:
// Do nothing.
if (TraceExecution)
errs() << ToolName << ": Debug Event: <unknown>\n";
break;
}
success = ContinueDebugEvent(DebugEvent.dwProcessId,
DebugEvent.dwThreadId,
dwContinueStatus);
if (!success) {
ec = windows_error(::GetLastError());
errs() << ToolName << ": Failed to continue debugging program: '"
<< ProgramToRun << "': " << ec.message() << '\n';
return -1;
}
dwContinueStatus = DBG_CONTINUE;
}
assert(0 && "Fell out of debug loop. This shouldn't be possible!");
return -1;
}
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