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/*
* Copyright 2023 The Android Open Source Project
*
* 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 <limits>
#include <memory>
#include <string>
#include <vector>
#include <linux/input-event-codes.h>
#include <InputDevice.h>
#include <InputReaderBase.h>
#include <MapperHelpers.h>
#include <TouchpadInputMapper.h>
namespace android {
namespace {
void setAxisInfo(ThreadSafeFuzzedDataProvider& fdp, FuzzEventHub& eventHub, int32_t id, int axis) {
if (fdp.ConsumeBool()) {
eventHub.setAbsoluteAxisInfo(id, axis,
RawAbsoluteAxisInfo{
.valid = fdp.ConsumeBool(),
.minValue = fdp.ConsumeIntegral<int32_t>(),
.maxValue = fdp.ConsumeIntegral<int32_t>(),
.flat = fdp.ConsumeIntegral<int32_t>(),
.fuzz = fdp.ConsumeIntegral<int32_t>(),
.resolution = fdp.ConsumeIntegral<int32_t>(),
});
}
}
void setAxisInfos(ThreadSafeFuzzedDataProvider& fdp, FuzzEventHub& eventHub, int32_t id) {
setAxisInfo(fdp, eventHub, id, ABS_MT_SLOT);
setAxisInfo(fdp, eventHub, id, ABS_MT_POSITION_X);
setAxisInfo(fdp, eventHub, id, ABS_MT_POSITION_Y);
setAxisInfo(fdp, eventHub, id, ABS_MT_PRESSURE);
setAxisInfo(fdp, eventHub, id, ABS_MT_ORIENTATION);
setAxisInfo(fdp, eventHub, id, ABS_MT_TOUCH_MAJOR);
setAxisInfo(fdp, eventHub, id, ABS_MT_TOUCH_MINOR);
setAxisInfo(fdp, eventHub, id, ABS_MT_WIDTH_MAJOR);
setAxisInfo(fdp, eventHub, id, ABS_MT_WIDTH_MINOR);
}
const std::vector<std::string> boolPropertiesToFuzz = {
"gestureProp.Compute_Surface_Area_from_Pressure",
"gestureProp.Drumroll_Suppression_Enable",
"gestureProp.Fling_Buffer_Suppress_Zero_Length_Scrolls",
"gestureProp.Stationary_Wiggle_Filter_Enabled",
};
const std::vector<std::string> doublePropertiesToFuzz = {
"gestureProp.Fake_Timestamp_Delta",
"gestureProp.Finger_Moving_Energy",
"gestureProp.Finger_Moving_Hysteresis",
"gestureProp.IIR_a1",
"gestureProp.IIR_a2",
"gestureProp.IIR_b0",
"gestureProp.IIR_b1",
"gestureProp.IIR_b2",
"gestureProp.IIR_b3",
"gestureProp.Max_Allowed_Pressure_Change_Per_Sec",
"gestureProp.Max_Hysteresis_Pressure_Per_Sec",
"gestureProp.Max_Stationary_Move_Speed",
"gestureProp.Max_Stationary_Move_Speed_Hysteresis",
"gestureProp.Max_Stationary_Move_Suppress_Distance",
"gestureProp.Multiple_Palm_Width",
"gestureProp.Palm_Edge_Zone_Width",
"gestureProp.Palm_Eval_Timeout",
"gestureProp.Palm_Pressure",
"gestureProp.Palm_Width",
"gestureProp.Pressure_Calibration_Offset",
"gestureProp.Pressure_Calibration_Slope",
"gestureProp.Tap_Exclusion_Border_Width",
"gestureProp.Touchpad_Device_Output_Bias_on_X-Axis",
"gestureProp.Touchpad_Device_Output_Bias_on_Y-Axis",
"gestureProp.Two_Finger_Vertical_Close_Distance_Thresh",
};
void setDeviceSpecificConfig(ThreadSafeFuzzedDataProvider& fdp, FuzzEventHub& eventHub) {
// There are a great many gesture properties offered by the Gestures library, all of which could
// potentially be set in Input Device Configuration files. Maintaining a complete list is
// impractical, so instead we only fuzz properties which are used in at least one IDC file, or
// which are likely to be used in future (e.g. ones for controlling palm rejection).
if (fdp.ConsumeBool()) {
eventHub.addProperty("gestureProp.Touchpad_Stack_Version",
std::to_string(fdp.ConsumeIntegral<int>()));
}
for (auto& propertyName : boolPropertiesToFuzz) {
if (fdp.ConsumeBool()) {
eventHub.addProperty(propertyName, fdp.ConsumeBool() ? "1" : "0");
}
}
for (auto& propertyName : doublePropertiesToFuzz) {
if (fdp.ConsumeBool()) {
eventHub.addProperty(propertyName, std::to_string(fdp.ConsumeFloatingPoint<double>()));
}
}
if (fdp.ConsumeBool()) {
eventHub.addProperty("gestureProp." + fdp.ConsumeRandomLengthString(),
std::to_string(fdp.ConsumeIntegral<int>()));
}
}
void setTouchpadSettings(ThreadSafeFuzzedDataProvider& fdp, InputReaderConfiguration& config) {
config.touchpadPointerSpeed = fdp.ConsumeIntegralInRange(-7, 7);
config.touchpadNaturalScrollingEnabled = fdp.ConsumeBool();
config.touchpadTapToClickEnabled = fdp.ConsumeBool();
config.touchpadTapDraggingEnabled = fdp.ConsumeBool();
config.touchpadRightClickZoneEnabled = fdp.ConsumeBool();
}
} // namespace
extern "C" int LLVMFuzzerTestOneInput(uint8_t* data, size_t size) {
std::shared_ptr<ThreadSafeFuzzedDataProvider> fdp =
std::make_shared<ThreadSafeFuzzedDataProvider>(data, size);
// Create mocked objects to support the fuzzed input mapper.
std::shared_ptr<FuzzEventHub> eventHub = std::make_shared<FuzzEventHub>(fdp);
FuzzInputReaderContext context(eventHub, fdp);
InputDevice device = getFuzzedInputDevice(*fdp, &context);
setAxisInfos(*fdp, *eventHub.get(), device.getId());
setDeviceSpecificConfig(*fdp, *eventHub.get());
InputReaderConfiguration policyConfig;
// Some settings are fuzzed here, as well as in the main loop, to provide randomized data to the
// TouchpadInputMapper constructor.
setTouchpadSettings(*fdp, policyConfig);
policyConfig.pointerCaptureRequest.enable = fdp->ConsumeBool();
TouchpadInputMapper& mapper =
getMapperForDevice<ThreadSafeFuzzedDataProvider, TouchpadInputMapper>(*fdp, device,
policyConfig);
// Loop through mapper operations until randomness is exhausted.
while (fdp->remaining_bytes() > 0) {
fdp->PickValueInArray<std::function<void()>>({
[&]() -> void {
std::string dump;
mapper.dump(dump);
},
[&]() -> void {
InputDeviceInfo info;
mapper.populateDeviceInfo(info);
},
[&]() -> void { mapper.getSources(); },
[&]() -> void {
setTouchpadSettings(*fdp, policyConfig);
policyConfig.pointerCaptureRequest.enable = fdp->ConsumeBool();
std::list<NotifyArgs> unused =
mapper.reconfigure(fdp->ConsumeIntegral<nsecs_t>(), policyConfig,
InputReaderConfiguration::Change(
fdp->ConsumeIntegral<uint32_t>()));
},
[&]() -> void {
std::list<NotifyArgs> unused = mapper.reset(fdp->ConsumeIntegral<nsecs_t>());
},
[&]() -> void {
RawEvent event = getFuzzedRawEvent(*fdp);
std::list<NotifyArgs> unused = mapper.process(&event);
},
})();
}
return 0;
}
} // namespace android
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