Revert of [chrome_elf] Big cleanup and removing dependencies that recently crept in. Part 1.

chrome_elf/crash/crash_helper.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome_elf/crash/crash_helper.h"
-
-#include <assert.h>
-#include <windows.h>
-
-#include <algorithm>
-#include <string>
-#include <vector>
-
-#include "chrome/app/chrome_crash_reporter_client_win.h"
-#include "chrome_elf/hook_util/hook_util.h"
-#include "components/crash/content/app/crashpad.h"
-#include "components/crash/core/common/crash_keys.h"
-#include "third_party/crashpad/crashpad/client/crashpad_client.h"
-
-namespace {
-
-// Crash handling from elf is only enabled for the chrome.exe process.
-// Use this global to safely handle the rare case where elf may not be in that
-// process (e.g. tests).
-bool g_crash_helper_enabled = false;
-
-// Gets the exe name from the full path of the exe.
-bool GetExeName(std::wstring* exe_name) {
-  std::wstring file_name;
-  file_name.resize(MAX_PATH);
-  if (!::GetModuleFileNameW(nullptr, &file_name[0], MAX_PATH)) {
-    assert(false);
-    return false;
-  }
-  size_t last_slash_pos = file_name.find_last_of(L'\\');
-  if (last_slash_pos != std::wstring::npos) {
-    *exe_name = file_name.substr(last_slash_pos + 1,
-                                 file_name.length() - last_slash_pos);
-  }
-  std::transform(exe_name->begin(), exe_name->end(), exe_name->begin(),
-                 ::tolower);
-  return true;
-}
-
-// Global pointer to a vector of crash reports.
-// This structure will be initialized in InitializeCrashReportingForProcess()
-// and cleaned up in DllDetachCrashReportingCleanup().
-std::vector<crash_reporter::Report>* g_crash_reports = nullptr;
-
-// chrome_elf loads early in the process and initializes Crashpad. That in turn
-// uses the SetUnhandledExceptionFilter API to set a top level exception
-// handler for the process. When the process eventually initializes, CRT sets
-// an exception handler which calls TerminateProcess which effectively bypasses
-// us. Ideally we want to be at the top of the unhandled exception filter
-// chain. However we don't have a good way of intercepting the
-// SetUnhandledExceptionFilter API in the sandbox. EAT patching kernel32 or
-// kernelbase should ideally work. However the kernel32 kernelbase dlls are
-// prebound which causes EAT patching to not work. Sidestep works. However it
-// is only supported for 32 bit. For now we use IAT patching for the
-// executable.
-// TODO(ananta).
-// Check if it is possible to fix EAT patching or use sidestep patching for
-// 32 bit and 64 bit for this purpose.
-elf_hook::IATHook* g_set_unhandled_exception_filter = nullptr;
-
-// Hook function, which ignores the request to set an unhandled-exception
-// filter.
-LPTOP_LEVEL_EXCEPTION_FILTER WINAPI
-SetUnhandledExceptionFilterPatch(LPTOP_LEVEL_EXCEPTION_FILTER filter) {
-  // Don't set the exception filter. Please see above for comments.
-  return nullptr;
-}
-
-}  // namespace
-
-//------------------------------------------------------------------------------
-// Public chrome_elf crash APIs
-//------------------------------------------------------------------------------
-
-namespace elf_crash {
-
-// NOTE: This function will be called from DllMain during DLL_PROCESS_ATTACH
-// (while we have the loader lock), so do not misbehave.
-bool InitializeCrashReporting() {
-  // We want to initialize crash reporting only in chrome.exe
-  std::wstring proc_name;
-  if (!GetExeName(&proc_name) ||
-      0 != ::wcscmp(proc_name.data(), L"chrome.exe")) {
-#ifdef _DEBUG
-    assert(false);
-#endif  // _DEBUG
-    return false;
-  }
-
-#ifdef _DEBUG
-  assert(g_crash_reports == nullptr);
-  assert(g_set_unhandled_exception_filter == nullptr);
-#endif  // _DEBUG
-
-  // No global objects with destructors, so using global pointers.
-  // DllMain on detach will clean these up.
-  g_crash_reports = new std::vector<crash_reporter::Report>;
-  g_set_unhandled_exception_filter = new elf_hook::IATHook();
-
-  ChromeCrashReporterClient::InitializeCrashReportingForProcess();
-
-  g_crash_helper_enabled = true;
-  return true;
-}
-
-// NOTE: This function will be called from DllMain during DLL_PROCESS_DETACH
-// (while we have the loader lock), so do not misbehave.
-void ShutdownCrashReporting() {
-  if (g_crash_reports != nullptr) {
-    g_crash_reports->clear();
-    delete g_crash_reports;
-  }
-  if (g_set_unhandled_exception_filter != nullptr) {
-    delete g_set_unhandled_exception_filter;
-  }
-}
-
-// Please refer to the comment on g_set_unhandled_exception_filter for more
-// information about why we intercept the SetUnhandledExceptionFilter API.
-void DisableSetUnhandledExceptionFilter() {
-  if (!g_crash_helper_enabled)
-    return;
-  if (g_set_unhandled_exception_filter->Hook(
-          ::GetModuleHandle(nullptr), "kernel32.dll",
-          "SetUnhandledExceptionFilter",
-          SetUnhandledExceptionFilterPatch) != NO_ERROR) {
-#ifdef _DEBUG
-    assert(false);
-#endif  //_DEBUG
-  }
-}
-
-int GenerateCrashDump(EXCEPTION_POINTERS* exception_pointers) {
-  if (g_crash_helper_enabled)
-    crashpad::CrashpadClient::DumpWithoutCrash(
-        *(exception_pointers->ContextRecord));
-  return EXCEPTION_CONTINUE_SEARCH;
-}
-
-}  // namespace elf_crash
-
-//------------------------------------------------------------------------------
-// Exported crash APIs for the rest of the process.
-//------------------------------------------------------------------------------
-
-// This helper is invoked by code in chrome.dll to retrieve the crash reports.
-// See CrashUploadListCrashpad. Note that we do not pass a std::vector here,
-// because we do not want to allocate/free in different modules. The returned
-// pointer is read-only.
-//
-// NOTE: Since the returned pointer references read-only memory that will be
-// cleaned up when this DLL unloads, be careful not to reference the memory
-// beyond that point (e.g. during tests).
-extern "C" __declspec(dllexport) void GetCrashReportsImpl(
-    const crash_reporter::Report** reports,
-    size_t* report_count) {
-  if (!g_crash_helper_enabled)
-    return;
-  crash_reporter::GetReports(g_crash_reports);
-  *reports = g_crash_reports->data();
-  *report_count = g_crash_reports->size();
-}
-
-// This helper is invoked by debugging code in chrome to register the client
-// id.
-extern "C" __declspec(dllexport) void SetMetricsClientId(
-    const char* client_id) {
-  if (!g_crash_helper_enabled)
-    return;
-  if (client_id)
-    crash_keys::SetMetricsClientIdFromGUID(client_id);
-}