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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/device/usb/usb_device_linux.h"
#include <fcntl.h>
#include <stddef.h>
#include <algorithm>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/posix/eintr_wrapper.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "components/device_event_log/device_event_log.h"
#include "services/device/usb/usb_descriptors.h"
#include "services/device/usb/usb_device_handle_usbfs.h"
#include "services/device/usb/usb_service.h"
#if BUILDFLAG(IS_CHROMEOS)
#include "base/memory/memory_pressure_monitor.h"
#include "base/process/process_metrics.h"
#include "chromeos/dbus/permission_broker/permission_broker_client.h" // nogncheck
#include "components/crash/core/common/crash_key.h"
#include "services/device/public/cpp/device_features.h"
namespace {
constexpr uint32_t kAllInterfacesMask = ~0U;
} // namespace
#endif // BUILDFLAG(IS_CHROMEOS)
namespace device {
UsbDeviceLinux::UsbDeviceLinux(const std::string& device_path,
std::unique_ptr<UsbDeviceDescriptor> descriptor)
: UsbDevice(std::move(descriptor->device_info)),
device_path_(device_path) {}
UsbDeviceLinux::~UsbDeviceLinux() = default;
#if BUILDFLAG(IS_CHROMEOS)
void UsbDeviceLinux::CheckUsbAccess(ResultCallback callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
chromeos::PermissionBrokerClient::Get()->CheckPathAccess(device_path_,
std::move(callback));
}
#endif // BUILDFLAG(IS_CHROMEOS)
void UsbDeviceLinux::Open(OpenCallback callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
#if BUILDFLAG(IS_CHROMEOS)
if (base::FeatureList::IsEnabled(features::kUsbDeviceLinuxOpenCrashKey)) {
// Opening a USB device on ChromeOS sometimes crashes with signatures seen
// in crbug.com/40069034 and crbug.com/332722607. The crash is caused by a
// CHECK failure in MessageWriter::AppendBasic when
// dbus_message_iter_append_basic fails (returns false). DBus documentation
// indicates this only happens on OOM, but it can also happen on file
// descriptor exhaustion.
//
// Record crash keys with the current memory pressure and open file
// descriptor counts to aid in debugging these crashes.
static crash_reporter::CrashKeyString<6> memory_pressure_critical(
"memory-pressure-critical");
static crash_reporter::CrashKeyString<12> open_fd_count("open-fd-count");
static crash_reporter::CrashKeyString<12> open_fd_soft_limit(
"open-fd-soft-limit");
auto* memory_pressure_monitor = base::MemoryPressureMonitor::Get();
if (memory_pressure_monitor) {
memory_pressure_critical.Set(
(memory_pressure_monitor->GetCurrentPressureLevel(
base::MemoryPressureMonitorTag::kUsbDeviceLinux) ==
base::MEMORY_PRESSURE_LEVEL_CRITICAL)
? "true"
: "false");
}
auto process_metrics = base::ProcessMetrics::CreateCurrentProcessMetrics();
if (process_metrics) {
open_fd_count.Set(
base::NumberToString(process_metrics->GetOpenFdCount()));
open_fd_soft_limit.Set(
base::NumberToString(process_metrics->GetOpenFdSoftLimit()));
}
}
// create the pipe used as a lifetime to re-attach the original kernel driver
// to the USB device in permission_broker.
base::ScopedFD read_end, write_end;
if (!base::CreatePipe(&read_end, &write_end, /*non_blocking*/ true)) {
LOG(ERROR) << "Couldn't create pipe for USB device " << device_path_;
std::move(callback).Run(nullptr);
return;
}
auto split_callback = base::SplitOnceCallback(std::move(callback));
chromeos::PermissionBrokerClient::Get()->OpenPathAndRegisterClient(
device_path_, kAllInterfacesMask, read_end.get(),
base::BindOnce(&UsbDeviceLinux::OnOpenRequestComplete, this,
std::move(split_callback.first), std::move(write_end)),
base::BindOnce(&UsbDeviceLinux::OnOpenRequestError, this,
std::move(split_callback.second)));
#else
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner =
UsbService::CreateBlockingTaskRunner();
blocking_task_runner->PostTask(
FROM_HERE,
base::BindOnce(&UsbDeviceLinux::OpenOnBlockingThread, this,
std::move(callback),
base::SingleThreadTaskRunner::GetCurrentDefault(),
blocking_task_runner));
#endif // BUILDFLAG(IS_CHROMEOS)
}
#if BUILDFLAG(IS_CHROMEOS)
void UsbDeviceLinux::OnOpenRequestComplete(OpenCallback callback,
base::ScopedFD lifeline_fd,
const std::string& client_id,
base::ScopedFD fd) {
if (!fd.is_valid()) {
USB_LOG(EVENT) << "Did not get valid device handle from permission broker.";
std::move(callback).Run(nullptr);
return;
}
Opened(std::move(fd), std::move(lifeline_fd), client_id, std::move(callback),
UsbService::CreateBlockingTaskRunner());
}
void UsbDeviceLinux::OnOpenRequestError(OpenCallback callback,
const std::string& error_name,
const std::string& error_message) {
USB_LOG(EVENT) << "Permission broker failed to open the device: "
<< error_name << ": " << error_message;
std::move(callback).Run(nullptr);
}
#else
void UsbDeviceLinux::OpenOnBlockingThread(
OpenCallback callback,
scoped_refptr<base::SequencedTaskRunner> task_runner,
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner) {
base::ScopedFD fd(HANDLE_EINTR(open(device_path_.c_str(), O_RDWR)));
// Client id is only used for ChromeOS so pass empty string here to indicate
// an invalid client id.
std::string empty_client_id = "";
if (fd.is_valid()) {
task_runner->PostTask(
FROM_HERE, base::BindOnce(&UsbDeviceLinux::Opened, this, std::move(fd),
base::ScopedFD(), empty_client_id,
std::move(callback), blocking_task_runner));
} else {
USB_PLOG(EVENT) << "Failed to open " << device_path_;
task_runner->PostTask(FROM_HERE,
base::BindOnce(std::move(callback), nullptr));
}
}
#endif // BUILDFLAG(IS_CHROMEOS)
void UsbDeviceLinux::Opened(
base::ScopedFD fd,
base::ScopedFD lifeline_fd,
const std::string& client_id,
OpenCallback callback,
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
scoped_refptr<UsbDeviceHandle> device_handle =
new UsbDeviceHandleUsbfs(this, std::move(fd), std::move(lifeline_fd),
client_id, blocking_task_runner);
handles().push_back(device_handle.get());
std::move(callback).Run(device_handle);
}
} // namespace device
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