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// Copyright 2018 The Crashpad Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "client/crashpad_client.h"
#include <fcntl.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "client/client_argv_handling.h"
#include "util/file/file_io.h"
#include "util/linux/exception_handler_client.h"
#include "util/linux/exception_information.h"
#include "util/linux/scoped_pr_set_dumpable.h"
#include "util/linux/scoped_pr_set_ptracer.h"
#include "util/misc/from_pointer_cast.h"
#include "util/posix/double_fork_and_exec.h"
#include "util/posix/signals.h"
namespace crashpad {
namespace {
std::string FormatArgumentInt(const std::string& name, int value) {
return base::StringPrintf("--%s=%d", name.c_str(), value);
}
std::string FormatArgumentAddress(const std::string& name, void* addr) {
return base::StringPrintf("--%s=%p", name.c_str(), addr);
}
#if defined(OS_ANDROID)
std::vector<std::string> BuildAppProcessArgs(
const std::string& class_name,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments,
int socket) {
std::vector<std::string> argv;
#if defined(ARCH_CPU_64_BITS)
argv.push_back("/system/bin/app_process64");
#else
argv.push_back("/system/bin/app_process32");
#endif
argv.push_back("/system/bin");
argv.push_back("--application");
argv.push_back(class_name);
std::vector<std::string> handler_argv = BuildHandlerArgvStrings(
base::FilePath(), database, metrics_dir, url, annotations, arguments);
if (socket != kInvalidFileHandle) {
handler_argv.push_back(FormatArgumentInt("initial-client-fd", socket));
}
argv.insert(argv.end(), handler_argv.begin() + 1, handler_argv.end());
return argv;
}
std::vector<std::string> BuildArgsToLaunchWithLinker(
const std::string& handler_trampoline,
const std::string& handler_library,
bool is_64_bit,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments,
int socket) {
std::vector<std::string> argv;
if (is_64_bit) {
argv.push_back("/system/bin/linker64");
} else {
argv.push_back("/system/bin/linker");
}
argv.push_back(handler_trampoline);
argv.push_back(handler_library);
std::vector<std::string> handler_argv = BuildHandlerArgvStrings(
base::FilePath(), database, metrics_dir, url, annotations, arguments);
if (socket != kInvalidFileHandle) {
handler_argv.push_back(FormatArgumentInt("initial-client-fd", socket));
}
argv.insert(argv.end(), handler_argv.begin() + 1, handler_argv.end());
return argv;
}
#endif // OS_ANDROID
// Launches a single use handler to snapshot this process.
class LaunchAtCrashHandler {
public:
static LaunchAtCrashHandler* Get() {
static LaunchAtCrashHandler* instance = new LaunchAtCrashHandler();
return instance;
}
bool Initialize(std::vector<std::string>* argv_in,
const std::vector<std::string>* envp) {
argv_strings_.swap(*argv_in);
if (envp) {
envp_strings_ = *envp;
StringVectorToCStringVector(envp_strings_, &envp_);
set_envp_ = true;
}
argv_strings_.push_back(FormatArgumentAddress("trace-parent-with-exception",
&exception_information_));
StringVectorToCStringVector(argv_strings_, &argv_);
return Signals::InstallCrashHandlers(HandleCrash, 0, &old_actions_);
}
bool HandleCrashNonFatal(int signo, siginfo_t* siginfo, void* context) {
if (first_chance_handler_ &&
first_chance_handler_(
signo, siginfo, static_cast<ucontext_t*>(context))) {
return true;
}
exception_information_.siginfo_address =
FromPointerCast<decltype(exception_information_.siginfo_address)>(
siginfo);
exception_information_.context_address =
FromPointerCast<decltype(exception_information_.context_address)>(
context);
exception_information_.thread_id = syscall(SYS_gettid);
ScopedPrSetPtracer set_ptracer(getpid(), /* may_log= */ false);
ScopedPrSetDumpable set_dumpable(/* may_log= */ false);
pid_t pid = fork();
if (pid < 0) {
return false;
}
if (pid == 0) {
if (set_envp_) {
execve(argv_[0],
const_cast<char* const*>(argv_.data()),
const_cast<char* const*>(envp_.data()));
} else {
execv(argv_[0], const_cast<char* const*>(argv_.data()));
}
_exit(EXIT_FAILURE);
}
int status;
waitpid(pid, &status, 0);
return false;
}
void HandleCrashFatal(int signo, siginfo_t* siginfo, void* context) {
if (enabled_ && HandleCrashNonFatal(signo, siginfo, context)) {
return;
}
Signals::RestoreHandlerAndReraiseSignalOnReturn(
siginfo, old_actions_.ActionForSignal(signo));
}
void SetFirstChanceHandler(CrashpadClient::FirstChanceHandler handler) {
first_chance_handler_ = handler;
}
static void Disable() { enabled_ = false; }
private:
LaunchAtCrashHandler() = default;
~LaunchAtCrashHandler() = delete;
static void HandleCrash(int signo, siginfo_t* siginfo, void* context) {
auto state = Get();
state->HandleCrashFatal(signo, siginfo, context);
}
Signals::OldActions old_actions_ = {};
std::vector<std::string> argv_strings_;
std::vector<const char*> argv_;
std::vector<std::string> envp_strings_;
std::vector<const char*> envp_;
ExceptionInformation exception_information_;
CrashpadClient::FirstChanceHandler first_chance_handler_ = nullptr;
bool set_envp_ = false;
static thread_local bool enabled_;
DISALLOW_COPY_AND_ASSIGN(LaunchAtCrashHandler);
};
thread_local bool LaunchAtCrashHandler::enabled_ = true;
// A pointer to the currently installed crash signal handler. This allows
// the static method CrashpadClient::DumpWithoutCrashing to simulate a crash
// using the currently configured crash handling strategy.
static LaunchAtCrashHandler* g_crash_handler;
} // namespace
CrashpadClient::CrashpadClient() {}
CrashpadClient::~CrashpadClient() {}
bool CrashpadClient::StartHandler(
const base::FilePath& handler,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments,
bool restartable,
bool asynchronous_start) {
// TODO(jperaza): Implement this after the Android/Linux ExceptionHandlerSever
// supports accepting new connections.
// https://crashpad.chromium.org/bug/30
NOTREACHED();
return false;
}
#if defined(OS_ANDROID)
// static
bool CrashpadClient::StartJavaHandlerAtCrash(
const std::string& class_name,
const std::vector<std::string>* env,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments) {
std::vector<std::string> argv = BuildAppProcessArgs(class_name,
database,
metrics_dir,
url,
annotations,
arguments,
kInvalidFileHandle);
auto signal_handler = LaunchAtCrashHandler::Get();
if (signal_handler->Initialize(&argv, env)) {
DCHECK(!g_crash_handler);
g_crash_handler = signal_handler;
return true;
}
return false;
}
// static
bool CrashpadClient::StartJavaHandlerForClient(
const std::string& class_name,
const std::vector<std::string>* env,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments,
int socket) {
std::vector<std::string> argv = BuildAppProcessArgs(
class_name, database, metrics_dir, url, annotations, arguments, socket);
return DoubleForkAndExec(argv, env, socket, false, nullptr);
}
// static
bool CrashpadClient::StartHandlerWithLinkerAtCrash(
const std::string& handler_trampoline,
const std::string& handler_library,
bool is_64_bit,
const std::vector<std::string>* env,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments) {
std::vector<std::string> argv =
BuildArgsToLaunchWithLinker(handler_trampoline,
handler_library,
is_64_bit,
database,
metrics_dir,
url,
annotations,
arguments,
kInvalidFileHandle);
auto signal_handler = LaunchAtCrashHandler::Get();
if (signal_handler->Initialize(&argv, env)) {
DCHECK(!g_crash_handler);
g_crash_handler = signal_handler;
return true;
}
return false;
}
// static
bool CrashpadClient::StartHandlerWithLinkerForClient(
const std::string& handler_trampoline,
const std::string& handler_library,
bool is_64_bit,
const std::vector<std::string>* env,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments,
int socket) {
std::vector<std::string> argv =
BuildArgsToLaunchWithLinker(handler_trampoline,
handler_library,
is_64_bit,
database,
metrics_dir,
url,
annotations,
arguments,
socket);
return DoubleForkAndExec(argv, env, socket, false, nullptr);
}
#endif
// static
bool CrashpadClient::StartHandlerAtCrash(
const base::FilePath& handler,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments) {
std::vector<std::string> argv = BuildHandlerArgvStrings(
handler, database, metrics_dir, url, annotations, arguments);
auto signal_handler = LaunchAtCrashHandler::Get();
if (signal_handler->Initialize(&argv, nullptr)) {
DCHECK(!g_crash_handler);
g_crash_handler = signal_handler;
return true;
}
return false;
}
// static
bool CrashpadClient::StartHandlerForClient(
const base::FilePath& handler,
const base::FilePath& database,
const base::FilePath& metrics_dir,
const std::string& url,
const std::map<std::string, std::string>& annotations,
const std::vector<std::string>& arguments,
int socket) {
std::vector<std::string> argv = BuildHandlerArgvStrings(
handler, database, metrics_dir, url, annotations, arguments);
argv.push_back(FormatArgumentInt("initial-client-fd", socket));
return DoubleForkAndExec(argv, nullptr, socket, true, nullptr);
}
// static
void CrashpadClient::DumpWithoutCrash(NativeCPUContext* context) {
DCHECK(g_crash_handler);
#if defined(ARCH_CPU_ARMEL)
memset(context->uc_regspace, 0, sizeof(context->uc_regspace));
#elif defined(ARCH_CPU_ARM64)
memset(context->uc_mcontext.__reserved,
0,
sizeof(context->uc_mcontext.__reserved));
#endif
siginfo_t siginfo;
siginfo.si_signo = Signals::kSimulatedSigno;
siginfo.si_errno = 0;
siginfo.si_code = 0;
g_crash_handler->HandleCrashNonFatal(
siginfo.si_signo, &siginfo, reinterpret_cast<void*>(context));
}
// static
void CrashpadClient::CrashWithoutDump(const std::string& message) {
LaunchAtCrashHandler::Disable();
LOG(FATAL) << message;
}
// static
void CrashpadClient::SetFirstChanceExceptionHandler(
FirstChanceHandler handler) {
DCHECK(g_crash_handler);
g_crash_handler->SetFirstChanceHandler(handler);
}
} // namespace crashpad