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// Copyright 2014 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.
// This module contains the necessary code to register the Breakpad exception
// handler. This implementation is based on Chrome's crash reporting code.
#include "chrome_elf/breakpad.h"
#include <sddl.h>
#include "base/macros.h"
#include "breakpad/src/client/windows/handler/exception_handler.h"
#include "chrome/common/chrome_version.h"
#include "chrome_elf/chrome_elf_util.h"
google_breakpad::ExceptionHandler* g_elf_breakpad = NULL;
namespace {
const wchar_t kBreakpadProductName[] = L"Chrome";
const wchar_t kBreakpadVersionEntry[] = L"ver";
const wchar_t kBreakpadProdEntry[] = L"prod";
const wchar_t kBreakpadPlatformEntry[] = L"plat";
const wchar_t kBreakpadPlatformWin32[] = L"Win32";
const wchar_t kBreakpadProcessEntry[] = L"ptype";
const wchar_t kBreakpadChannelEntry[] = L"channel";
// The protocol for connecting to the out-of-process Breakpad crash
// reporter is different for x86-32 and x86-64: the message sizes
// are different because the message struct contains a pointer. As
// a result, there are two different named pipes to connect to. The
// 64-bit one is distinguished with an "-x64" suffix.
const wchar_t kChromePipeName[] = L"\\\\.\\pipe\\ChromeCrashServices\\";
const wchar_t kGoogleUpdatePipeName[] = L"\\\\.\\pipe\\GoogleCrashServices\\";
const wchar_t kSystemPrincipalSid[] = L"S-1-5-18";
const wchar_t kNoErrorDialogs[] = L"noerrdialogs";
google_breakpad::CustomClientInfo* GetCustomInfo() {
base::string16 process = IsNonBrowserProcess() ? L"renderer" : L"browser";
wchar_t exe_path[MAX_PATH] = {};
base::string16 channel;
if (GetModuleFileName(NULL, exe_path, arraysize(exe_path)) &&
IsCanary(exe_path)) {
channel = L"canary";
}
static google_breakpad::CustomInfoEntry ver_entry(
kBreakpadVersionEntry, TEXT(CHROME_VERSION_STRING));
static google_breakpad::CustomInfoEntry prod_entry(
kBreakpadProdEntry, kBreakpadProductName);
static google_breakpad::CustomInfoEntry plat_entry(
kBreakpadPlatformEntry, kBreakpadPlatformWin32);
static google_breakpad::CustomInfoEntry proc_entry(
kBreakpadProcessEntry, process.c_str());
static google_breakpad::CustomInfoEntry channel_entry(
kBreakpadChannelEntry, channel.c_str());
static google_breakpad::CustomInfoEntry entries[] = {
ver_entry, prod_entry, plat_entry, proc_entry, channel_entry};
static google_breakpad::CustomClientInfo custom_info = {
entries, arraysize(entries) };
return &custom_info;
}
base::string16 GetUserSidString() {
// Get the current token.
HANDLE token = NULL;
base::string16 user_sid;
if (!::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &token))
return user_sid;
DWORD size = sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE;
BYTE user_bytes[sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE] = {};
TOKEN_USER* user = reinterpret_cast<TOKEN_USER*>(user_bytes);
wchar_t* sid_string = NULL;
if (::GetTokenInformation(token, TokenUser, user, size, &size) &&
user->User.Sid &&
::ConvertSidToStringSid(user->User.Sid, &sid_string)) {
user_sid = sid_string;
::LocalFree(sid_string);
}
CloseHandle(token);
return user_sid;
}
bool IsHeadless() {
DWORD ret = ::GetEnvironmentVariable(L"CHROME_HEADLESS", NULL, 0);
if (ret != 0)
return true;
wchar_t* command_line = ::GetCommandLine();
// Note: Since this is a pure substring search rather than a check for a
// switch, there is a small chance that this code will match things that the
// Chrome code (which executes a similar check) does not. However, as long as
// no other switches contain the string "noerrdialogs", it should not be an
// issue.
return (command_line && wcsstr(command_line, kNoErrorDialogs));
}
} // namespace
int GenerateCrashDump(EXCEPTION_POINTERS* exinfo) {
DWORD code = exinfo->ExceptionRecord->ExceptionCode;
if (code == EXCEPTION_BREAKPOINT || code == EXCEPTION_SINGLE_STEP)
return EXCEPTION_CONTINUE_SEARCH;
if (g_elf_breakpad != NULL)
g_elf_breakpad->WriteMinidumpForException(exinfo);
return EXCEPTION_CONTINUE_SEARCH;
}
void InitializeCrashReporting() {
wchar_t exe_path[MAX_PATH] = {};
if (!::GetModuleFileName(NULL, exe_path, arraysize(exe_path)))
return;
// Disable the message box for assertions.
_CrtSetReportMode(_CRT_ASSERT, 0);
// Get the alternate dump directory. We use the temp path.
// N.B. We don't use base::GetTempDir() here to avoid running more code then
// necessary before crashes can be properly reported.
wchar_t temp_directory[MAX_PATH + 1] = {};
DWORD length = GetTempPath(MAX_PATH, temp_directory);
if (length == 0)
return;
// Minidump with stacks, PEB, TEBs and unloaded module list.
MINIDUMP_TYPE dump_type = static_cast<MINIDUMP_TYPE>(
MiniDumpWithProcessThreadData | // Get PEB and TEB.
MiniDumpWithUnloadedModules | // Get unloaded modules when available.
MiniDumpWithIndirectlyReferencedMemory); // Get memory referenced by
// stack.
#if defined(GOOGLE_CHROME_BUILD) && defined(OFFICIAL_BUILD)
bool is_official_chrome_build = true;
#else
bool is_official_chrome_build = false;
#endif
base::string16 pipe_name;
bool enabled_by_policy = false;
bool use_policy = ReportingIsEnforcedByPolicy(&enabled_by_policy);
if (!use_policy && IsHeadless()) {
pipe_name = kChromePipeName;
} else if (use_policy ?
enabled_by_policy :
(is_official_chrome_build && AreUsageStatsEnabled(exe_path))) {
// Build the pipe name. It can be one of:
// 32-bit system: \\.\pipe\GoogleCrashServices\S-1-5-18
// 32-bit user: \\.\pipe\GoogleCrashServices\<user SID>
// 64-bit system: \\.\pipe\GoogleCrashServices\S-1-5-18-x64
// 64-bit user: \\.\pipe\GoogleCrashServices\<user SID>-x64
base::string16 user_sid = IsSystemInstall(exe_path) ? kSystemPrincipalSid :
GetUserSidString();
if (user_sid.empty())
return;
pipe_name = kGoogleUpdatePipeName;
pipe_name += user_sid;
#if defined(_WIN64)
pipe_name += L"-x64";
#endif
} else {
// Either this is a Chromium build, reporting is disabled by policy or the
// user has not given consent.
return;
}
g_elf_breakpad = new google_breakpad::ExceptionHandler(
temp_directory,
NULL,
NULL,
NULL,
google_breakpad::ExceptionHandler::HANDLER_ALL,
dump_type,
pipe_name.c_str(),
GetCustomInfo());
if (g_elf_breakpad->IsOutOfProcess()) {
// Tells breakpad to handle breakpoint and single step exceptions.
g_elf_breakpad->set_handle_debug_exceptions(true);
}
}