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// Copyright 2017 The Crashpad Authors
//
// 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 "snapshot/linux/process_snapshot_linux.h"
#include <utility>
#include "base/logging.h"
#include "build/build_config.h"
#include "util/linux/exception_information.h"
namespace crashpad {
ProcessSnapshotLinux::ProcessSnapshotLinux() = default;
ProcessSnapshotLinux::~ProcessSnapshotLinux() = default;
bool ProcessSnapshotLinux::Initialize(PtraceConnection* connection) {
INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
if (gettimeofday(&snapshot_time_, nullptr) != 0) {
PLOG(ERROR) << "gettimeofday";
return false;
}
if (!process_reader_.Initialize(connection) ||
!memory_range_.Initialize(process_reader_.Memory(),
process_reader_.Is64Bit())) {
return false;
}
client_id_.InitializeToZero();
system_.Initialize(&process_reader_, &snapshot_time_);
InitializeModules();
GetCrashpadOptionsInternal((&options_));
InitializeThreads();
InitializeAnnotations();
INITIALIZATION_STATE_SET_VALID(initialized_);
return true;
}
pid_t ProcessSnapshotLinux::FindThreadWithStackAddress(
VMAddress stack_address) {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
for (const auto& thread : process_reader_.Threads()) {
if (stack_address >= thread.stack_region_address &&
stack_address <
thread.stack_region_address + thread.stack_region_size) {
return thread.tid;
}
}
return -1;
}
bool ProcessSnapshotLinux::InitializeException(
LinuxVMAddress exception_info_address,
pid_t exception_thread_id) {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
DCHECK(!exception_);
ExceptionInformation info;
if (!process_reader_.Memory()->Read(
exception_info_address, sizeof(info), &info)) {
LOG(ERROR) << "Couldn't read exception info";
return false;
}
if (exception_thread_id >= 0) {
info.thread_id = exception_thread_id;
}
uint32_t* budget_remaining_pointer =
options_.gather_indirectly_referenced_memory == TriState::kEnabled
? &options_.indirectly_referenced_memory_cap
: nullptr;
exception_.reset(new internal::ExceptionSnapshotLinux());
if (!exception_->Initialize(&process_reader_,
info.siginfo_address,
info.context_address,
info.thread_id,
budget_remaining_pointer)) {
exception_.reset();
return false;
}
// The thread's existing snapshot will have captured the stack for the signal
// handler. Replace it with a thread snapshot which captures the stack for the
// exception context.
for (const auto& reader_thread : process_reader_.Threads()) {
if (reader_thread.tid == info.thread_id) {
ProcessReaderLinux::Thread thread = reader_thread;
thread.InitializeStackFromSP(&process_reader_,
exception_->Context()->StackPointer());
auto exc_thread_snapshot =
std::make_unique<internal::ThreadSnapshotLinux>();
if (!exc_thread_snapshot->Initialize(&process_reader_, thread, nullptr)) {
return false;
}
for (auto& thread_snapshot : threads_) {
if (thread_snapshot->ThreadID() ==
static_cast<uint64_t>(info.thread_id)) {
thread_snapshot.reset(exc_thread_snapshot.release());
return true;
}
}
LOG(ERROR) << "thread not found " << info.thread_id;
return false;
}
}
LOG(ERROR) << "thread not found " << info.thread_id;
return false;
}
void ProcessSnapshotLinux::GetCrashpadOptions(
CrashpadInfoClientOptions* options) {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
*options = options_;
}
void ProcessSnapshotLinux::GetCrashpadOptionsInternal(
CrashpadInfoClientOptions* options) {
CrashpadInfoClientOptions local_options;
for (const auto& module : modules_) {
CrashpadInfoClientOptions module_options;
if (!module->GetCrashpadOptions(&module_options)) {
continue;
}
if (local_options.crashpad_handler_behavior == TriState::kUnset) {
local_options.crashpad_handler_behavior =
module_options.crashpad_handler_behavior;
}
if (local_options.system_crash_reporter_forwarding == TriState::kUnset) {
local_options.system_crash_reporter_forwarding =
module_options.system_crash_reporter_forwarding;
}
if (local_options.gather_indirectly_referenced_memory == TriState::kUnset) {
local_options.gather_indirectly_referenced_memory =
module_options.gather_indirectly_referenced_memory;
local_options.indirectly_referenced_memory_cap =
module_options.indirectly_referenced_memory_cap;
}
// If non-default values have been found for all options, the loop can end
// early.
if (local_options.crashpad_handler_behavior != TriState::kUnset &&
local_options.system_crash_reporter_forwarding != TriState::kUnset &&
local_options.gather_indirectly_referenced_memory != TriState::kUnset) {
break;
}
}
*options = local_options;
}
crashpad::ProcessID ProcessSnapshotLinux::ProcessID() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return process_reader_.ProcessID();
}
crashpad::ProcessID ProcessSnapshotLinux::ParentProcessID() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return process_reader_.ParentProcessID();
}
void ProcessSnapshotLinux::SnapshotTime(timeval* snapshot_time) const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
*snapshot_time = snapshot_time_;
}
void ProcessSnapshotLinux::ProcessStartTime(timeval* start_time) const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
process_reader_.StartTime(start_time);
}
void ProcessSnapshotLinux::ProcessCPUTimes(timeval* user_time,
timeval* system_time) const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
process_reader_.CPUTimes(user_time, system_time);
}
void ProcessSnapshotLinux::ReportID(UUID* report_id) const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
*report_id = report_id_;
}
void ProcessSnapshotLinux::ClientID(UUID* client_id) const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
*client_id = client_id_;
}
const std::map<std::string, std::string>&
ProcessSnapshotLinux::AnnotationsSimpleMap() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return annotations_simple_map_;
}
const SystemSnapshot* ProcessSnapshotLinux::System() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return &system_;
}
std::vector<const ThreadSnapshot*> ProcessSnapshotLinux::Threads() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
std::vector<const ThreadSnapshot*> threads;
for (const auto& thread : threads_) {
threads.push_back(thread.get());
}
return threads;
}
std::vector<const ModuleSnapshot*> ProcessSnapshotLinux::Modules() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
std::vector<const ModuleSnapshot*> modules;
for (const auto& module : modules_) {
modules.push_back(module.get());
}
return modules;
}
std::vector<UnloadedModuleSnapshot> ProcessSnapshotLinux::UnloadedModules()
const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
// TODO(jperaza): Can this be implemented on Linux?
return std::vector<UnloadedModuleSnapshot>();
}
const ExceptionSnapshot* ProcessSnapshotLinux::Exception() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return exception_.get();
}
std::vector<const MemoryMapRegionSnapshot*> ProcessSnapshotLinux::MemoryMap()
const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
// TODO(jperaza): do this.
return std::vector<const MemoryMapRegionSnapshot*>();
}
std::vector<HandleSnapshot> ProcessSnapshotLinux::Handles() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return std::vector<HandleSnapshot>();
}
std::vector<const MemorySnapshot*> ProcessSnapshotLinux::ExtraMemory() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return std::vector<const MemorySnapshot*>();
}
const ProcessMemory* ProcessSnapshotLinux::Memory() const {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
return process_reader_.Memory();
}
void ProcessSnapshotLinux::InitializeThreads() {
const std::vector<ProcessReaderLinux::Thread>& process_reader_threads =
process_reader_.Threads();
uint32_t* budget_remaining_pointer =
options_.gather_indirectly_referenced_memory == TriState::kEnabled
? &options_.indirectly_referenced_memory_cap
: nullptr;
for (const ProcessReaderLinux::Thread& process_reader_thread :
process_reader_threads) {
auto thread = std::make_unique<internal::ThreadSnapshotLinux>();
if (thread->Initialize(&process_reader_,
process_reader_thread,
budget_remaining_pointer)) {
threads_.push_back(std::move(thread));
}
}
}
void ProcessSnapshotLinux::InitializeModules() {
for (const ProcessReaderLinux::Module& reader_module :
process_reader_.Modules()) {
auto module =
std::make_unique<internal::ModuleSnapshotElf>(reader_module.name,
reader_module.elf_reader,
reader_module.type,
&memory_range_,
process_reader_.Memory());
if (module->Initialize()) {
modules_.push_back(std::move(module));
}
}
}
void ProcessSnapshotLinux::InitializeAnnotations() {
#if BUILDFLAG(IS_ANDROID)
const std::string& abort_message = process_reader_.AbortMessage();
if (!abort_message.empty()) {
annotations_simple_map_["abort_message"] = abort_message;
}
#endif
}
} // namespace crashpad