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