chrome_elf/breakpad.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This module contains the necessary code to register the Breakpad exception
   6 // handler. This implementation is based on Chrome's crash reporting code.
   7
   8 #include "chrome_elf/breakpad.h"
   9
  10 #include <sddl.h>
  11
  12 #include "base/macros.h"
  13 #include "breakpad/src/client/windows/handler/exception_handler.h"
  14 #include "chrome_elf/chrome_elf_util.h"
  15 #include "version.h"  // NOLINT
  16
  17 google_breakpad::ExceptionHandler* g_elf_breakpad = NULL;
  18
  19 namespace {
  20
  21 const wchar_t kBreakpadProductName[] = L"Chrome";
  22 const wchar_t kBreakpadVersionEntry[] = L"ver";
  23 const wchar_t kBreakpadProdEntry[] = L"prod";
  24 const wchar_t kBreakpadPlatformEntry[] = L"plat";
  25 const wchar_t kBreakpadPlatformWin32[] = L"Win32";
  26 const wchar_t kBreakpadProcessEntry[] = L"ptype";
  27 const wchar_t kBreakpadChannelEntry[] = L"channel";
  28
  29 // The protocol for connecting to the out-of-process Breakpad crash
  30 // reporter is different for x86-32 and x86-64: the message sizes
  31 // are different because the message struct contains a pointer.  As
  32 // a result, there are two different named pipes to connect to.  The
  33 // 64-bit one is distinguished with an "-x64" suffix.
  34 const wchar_t kChromePipeName[] = L"\\\\.\\pipe\\ChromeCrashServices\\";
  35 const wchar_t kGoogleUpdatePipeName[] = L"\\\\.\\pipe\\GoogleCrashServices\\";
  36 const wchar_t kSystemPrincipalSid[] = L"S-1-5-18";
  37
  38 const wchar_t kNoErrorDialogs[] = L"noerrdialogs";
  39 const wchar_t kChromeHeadless[] = L"CHROME_HEADLESS";
  40
  41 google_breakpad::CustomClientInfo* GetCustomInfo() {
  42   base::string16 process = IsNonBrowserProcess() ? L"renderer" : L"browser";
  43
  44   wchar_t exe_path[MAX_PATH] = {};
  45   base::string16 channel;
  46   if (GetModuleFileName(NULL, exe_path, arraysize(exe_path)) &&
  47       IsCanary(exe_path)) {
  48     channel = L"canary";
  49   }
  50
  51   static google_breakpad::CustomInfoEntry ver_entry(
  52       kBreakpadVersionEntry, TEXT(CHROME_VERSION_STRING));
  53   static google_breakpad::CustomInfoEntry prod_entry(
  54       kBreakpadProdEntry, kBreakpadProductName);
  55   static google_breakpad::CustomInfoEntry plat_entry(
  56       kBreakpadPlatformEntry, kBreakpadPlatformWin32);
  57   static google_breakpad::CustomInfoEntry proc_entry(
  58       kBreakpadProcessEntry, process.c_str());
  59   static google_breakpad::CustomInfoEntry channel_entry(
  60       kBreakpadChannelEntry, channel.c_str());
  61   static google_breakpad::CustomInfoEntry entries[] = {
  62       ver_entry, prod_entry, plat_entry, proc_entry, channel_entry};
  63   static google_breakpad::CustomClientInfo custom_info = {
  64       entries, arraysize(entries) };
  65   return &custom_info;
  66 }
  67
  68 base::string16 GetUserSidString() {
  69   // Get the current token.
  70   HANDLE token = NULL;
  71   base::string16 user_sid;
  72   if (!::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &token))
  73     return user_sid;
  74
  75   DWORD size = sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE;
  76   BYTE user_bytes[sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE] = {};
  77   TOKEN_USER* user = reinterpret_cast<TOKEN_USER*>(user_bytes);
  78
  79   wchar_t* sid_string = NULL;
  80   if (::GetTokenInformation(token, TokenUser, user, size, &size) &&
  81       user->User.Sid &&
  82       ::ConvertSidToStringSid(user->User.Sid, &sid_string)) {
  83     user_sid = sid_string;
  84     ::LocalFree(sid_string);
  85   }
  86
  87   CloseHandle(token);
  88   return user_sid;
  89 }
  90
  91 bool IsHeadless() {
  92   DWORD ret = ::GetEnvironmentVariable(L"CHROME_HEADLESS", NULL, 0);
  93   if (ret != 0)
  94     return true;
  95
  96   wchar_t* command_line = ::GetCommandLine();
  97
  98   // Note: Since this is a pure substring search rather than a check for a
  99   // switch, there is a small chance that this code will match things that the
 100   // Chrome code (which executes a similar check) does not. However, as long as
 101   // no other switches contain the string "noerrdialogs", it should not be an
 102   // issue.
 103   return (command_line && wcsstr(command_line, kNoErrorDialogs));
 104 }
 105
 106 }  // namespace
 107
 108 int GenerateCrashDump(EXCEPTION_POINTERS* exinfo) {
 109   DWORD code = exinfo->ExceptionRecord->ExceptionCode;
 110   if (code == EXCEPTION_BREAKPOINT || code == EXCEPTION_SINGLE_STEP)
 111     return EXCEPTION_CONTINUE_SEARCH;
 112
 113   if (g_elf_breakpad != NULL)
 114     g_elf_breakpad->WriteMinidumpForException(exinfo);
 115   return EXCEPTION_CONTINUE_SEARCH;
 116 }
 117
 118 void InitializeCrashReporting() {
 119   wchar_t exe_path[MAX_PATH] = {};
 120   if (!::GetModuleFileName(NULL, exe_path, arraysize(exe_path)))
 121     return;
 122
 123   // Disable the message box for assertions.
 124   _CrtSetReportMode(_CRT_ASSERT, 0);
 125
 126   // Get the alternate dump directory. We use the temp path.
 127   // N.B. We don't use base::GetTempDir() here to avoid running more code then
 128   //      necessary before crashes can be properly reported.
 129   wchar_t temp_directory[MAX_PATH + 1] = {};
 130   DWORD length = GetTempPath(MAX_PATH, temp_directory);
 131   if (length == 0)
 132     return;
 133
 134   // Minidump with stacks, PEB, TEBs and unloaded module list.
 135   MINIDUMP_TYPE dump_type = static_cast<MINIDUMP_TYPE>(
 136       MiniDumpWithProcessThreadData |  // Get PEB and TEB.
 137       MiniDumpWithUnloadedModules |  // Get unloaded modules when available.
 138       MiniDumpWithIndirectlyReferencedMemory);  // Get memory referenced by
 139                                                 // stack.
 140
 141 #if defined(GOOGLE_CHROME_BUILD) && defined(OFFICIAL_BUILD)
 142   bool is_official_chrome_build = true;
 143 #else
 144   bool is_official_chrome_build = false;
 145 #endif
 146
 147   base::string16 pipe_name;
 148
 149   bool enabled_by_policy = false;
 150   bool use_policy = ReportingIsEnforcedByPolicy(&enabled_by_policy);
 151
 152   if (!use_policy && IsHeadless()) {
 153     pipe_name = kChromePipeName;
 154   } else if (use_policy ?
 155                  enabled_by_policy :
 156                  (is_official_chrome_build && AreUsageStatsEnabled(exe_path))) {
 157     // Build the pipe name. It can be one of:
 158     // 32-bit system: \\.\pipe\GoogleCrashServices\S-1-5-18
 159     // 32-bit user: \\.\pipe\GoogleCrashServices\<user SID>
 160     // 64-bit system: \\.\pipe\GoogleCrashServices\S-1-5-18-x64
 161     // 64-bit user: \\.\pipe\GoogleCrashServices\<user SID>-x64
 162     base::string16 user_sid = IsSystemInstall(exe_path) ? kSystemPrincipalSid :
 163                                                           GetUserSidString();
 164     if (user_sid.empty())
 165       return;
 166
 167     pipe_name = kGoogleUpdatePipeName;
 168     pipe_name += user_sid;
 169
 170 #if defined(_WIN64)
 171     pipe_name += L"-x64";
 172 #endif
 173   } else {
 174     // Either this is a Chromium build, reporting is disabled by policy or the
 175     // user has not given consent.
 176     return;
 177   }
 178
 179   g_elf_breakpad = new google_breakpad::ExceptionHandler(
 180       temp_directory,
 181       NULL,
 182       NULL,
 183       NULL,
 184       google_breakpad::ExceptionHandler::HANDLER_ALL,
 185       dump_type,
 186       pipe_name.c_str(),
 187       GetCustomInfo());
 188
 189   if (g_elf_breakpad->IsOutOfProcess()) {
 190     // Tells breakpad to handle breakpoint and single step exceptions.
 191     g_elf_breakpad->set_handle_debug_exceptions(true);
 192   }
 193 }