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wlroots-hyprland/backend/libinput/events.c
John Lindgren 2b767fe743 backend/libinput: Fix SIGSEGV found in low-memory fuzzing 
Stack trace:

    #0  0x00007f17081f5b99 in wl_list_insert (list=list@entry=0x2d8, elm=elm@entry=0x7ffe7f7e85d0)
        at ../wayland-1.21.0/src/wayland-util.c:48
    #1  0x00007f17081f5f2e in wl_signal_emit_mutable (signal=signal@entry=0x2d8, data=data@entry=0x7ffe7f7e8660)
        at ../wayland-1.21.0/src/wayland-server.c:2167
    #2  0x00007f170815a971 in handle_switch_toggle (wlr_switch=0x2a0, event=0x55d5ba13dc00)
        at ../backend/libinput/switch.c:50
    #3  handle_libinput_event (event=0x55d5ba13dc00, backend=0x55d5b975d740) at ../backend/libinput/events.c:234
    #4  handle_libinput_readable (fd=<optimized out>, mask=<optimized out>, _backend=<optimized out>)
        at ../backend/libinput/backend.c:58
    #5  handle_libinput_readable (fd=fd@entry=34, mask=mask@entry=1, _backend=_backend@entry=0x55d5b975d740)
        at ../backend/libinput/backend.c:48
    #6  0x00007f170815c110 in backend_start (wlr_backend=0x55d5b975d740) at ../backend/libinput/backend.c:109
    #7  0x00007f1708160996 in multi_backend_start (wlr_backend=0x55d5b97583d0) at ../backend/multi/backend.c:32
2022-09-22 13:37:32 -04:00

265 lines
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#define _POSIX_C_SOURCE 200809L
#include <libinput.h>
#include <stdlib.h>
#include <wlr/backend/session.h>
#include <wlr/interfaces/wlr_keyboard.h>
#include <wlr/interfaces/wlr_pointer.h>
#include <wlr/interfaces/wlr_touch.h>
#include <wlr/interfaces/wlr_tablet_tool.h>
#include <wlr/interfaces/wlr_tablet_pad.h>
#include <wlr/interfaces/wlr_switch.h>
#include <wlr/util/log.h>
#include "backend/libinput.h"
void destroy_libinput_input_device(struct wlr_libinput_input_device *dev) {
if (dev->keyboard.impl) {
wlr_keyboard_finish(&dev->keyboard);
}
if (dev->pointer.impl) {
wlr_pointer_finish(&dev->pointer);
}
if (dev->switch_device.impl) {
wlr_switch_finish(&dev->switch_device);
}
if (dev->touch.impl) {
wlr_touch_finish(&dev->touch);
}
if (dev->tablet.impl) {
finish_device_tablet(dev);
}
if (dev->tablet_pad.impl) {
finish_device_tablet_pad(dev);
}
libinput_device_unref(dev->handle);
wl_list_remove(&dev->link);
free(dev);
}
bool wlr_input_device_is_libinput(struct wlr_input_device *wlr_dev) {
switch (wlr_dev->type) {
case WLR_INPUT_DEVICE_KEYBOARD:
return wlr_keyboard_from_input_device(wlr_dev)->impl ==
&libinput_keyboard_impl;
case WLR_INPUT_DEVICE_POINTER:
return wlr_pointer_from_input_device(wlr_dev)->impl ==
&libinput_pointer_impl;
case WLR_INPUT_DEVICE_TOUCH:
return wlr_touch_from_input_device(wlr_dev)->impl ==
&libinput_touch_impl;
case WLR_INPUT_DEVICE_TABLET_TOOL:
return wlr_tablet_from_input_device(wlr_dev)-> impl ==
&libinput_tablet_impl;
case WLR_INPUT_DEVICE_TABLET_PAD:
return wlr_tablet_pad_from_input_device(wlr_dev)->impl ==
&libinput_tablet_pad_impl;
case WLR_INPUT_DEVICE_SWITCH:
return wlr_switch_from_input_device(wlr_dev)->impl ==
&libinput_switch_impl;
default:
return false;
}
}
static void handle_device_added(struct wlr_libinput_backend *backend,
struct libinput_device *libinput_dev) {
int vendor = libinput_device_get_id_vendor(libinput_dev);
int product = libinput_device_get_id_product(libinput_dev);
const char *name = libinput_device_get_name(libinput_dev);
wlr_log(WLR_DEBUG, "Adding %s [%d:%d]", name, vendor, product);
struct wlr_libinput_input_device *dev =
calloc(1, sizeof(struct wlr_libinput_input_device));
if (dev == NULL) {
wlr_log_errno(WLR_ERROR, "failed to allocate wlr_libinput_input_device");
return;
}
dev->handle = libinput_dev;
libinput_device_ref(libinput_dev);
libinput_device_set_user_data(libinput_dev, dev);
wl_list_insert(&backend->devices, &dev->link);
if (libinput_device_has_capability(
libinput_dev, LIBINPUT_DEVICE_CAP_KEYBOARD)) {
init_device_keyboard(dev);
wl_signal_emit_mutable(&backend->backend.events.new_input,
&dev->keyboard.base);
}
if (libinput_device_has_capability(
libinput_dev, LIBINPUT_DEVICE_CAP_POINTER)) {
init_device_pointer(dev);
wl_signal_emit_mutable(&backend->backend.events.new_input,
&dev->pointer.base);
}
if (libinput_device_has_capability(
libinput_dev, LIBINPUT_DEVICE_CAP_SWITCH)) {
init_device_switch(dev);
wl_signal_emit_mutable(&backend->backend.events.new_input,
&dev->switch_device.base);
}
if (libinput_device_has_capability(
libinput_dev, LIBINPUT_DEVICE_CAP_TOUCH)) {
init_device_touch(dev);
wl_signal_emit_mutable(&backend->backend.events.new_input,
&dev->touch.base);
}
if (libinput_device_has_capability(libinput_dev,
LIBINPUT_DEVICE_CAP_TABLET_TOOL)) {
init_device_tablet(dev);
wl_signal_emit_mutable(&backend->backend.events.new_input,
&dev->tablet.base);
}
if (libinput_device_has_capability(
libinput_dev, LIBINPUT_DEVICE_CAP_TABLET_PAD)) {
init_device_tablet_pad(dev);
wl_signal_emit_mutable(&backend->backend.events.new_input,
&dev->tablet_pad.base);
}
if (libinput_device_has_capability(
libinput_dev, LIBINPUT_DEVICE_CAP_GESTURE)) {
wlr_log(WLR_DEBUG, "libinput gesture not handled");
}
}
static void handle_device_removed(struct wlr_libinput_backend *backend,
struct wlr_libinput_input_device *dev) {
int vendor = libinput_device_get_id_vendor(dev->handle);
int product = libinput_device_get_id_product(dev->handle);
const char *name = libinput_device_get_name(dev->handle);
wlr_log(WLR_DEBUG, "Removing %s [%d:%d]", name, vendor, product);
destroy_libinput_input_device(dev);
}
void handle_libinput_event(struct wlr_libinput_backend *backend,
struct libinput_event *event) {
struct libinput_device *libinput_dev = libinput_event_get_device(event);
struct wlr_libinput_input_device *dev =
libinput_device_get_user_data(libinput_dev);
enum libinput_event_type event_type = libinput_event_get_type(event);
if (dev == NULL && event_type != LIBINPUT_EVENT_DEVICE_ADDED) {
wlr_log(WLR_ERROR, "libinput_device has no wlr_libinput_input_device");
return;
}
switch (event_type) {
case LIBINPUT_EVENT_DEVICE_ADDED:
handle_device_added(backend, libinput_dev);
break;
case LIBINPUT_EVENT_DEVICE_REMOVED:
handle_device_removed(backend, dev);
break;
case LIBINPUT_EVENT_KEYBOARD_KEY:
handle_keyboard_key(event, &dev->keyboard);
break;
case LIBINPUT_EVENT_POINTER_MOTION:
handle_pointer_motion(event, &dev->pointer);
break;
case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
handle_pointer_motion_abs(event, &dev->pointer);
break;
case LIBINPUT_EVENT_POINTER_BUTTON:
handle_pointer_button(event, &dev->pointer);
break;
case LIBINPUT_EVENT_POINTER_AXIS:
#if !LIBINPUT_HAS_SCROLL_VALUE120
/* This event must be ignored in favour of the SCROLL_* events */
handle_pointer_axis(event, &dev->pointer);
#endif
break;
#if LIBINPUT_HAS_SCROLL_VALUE120
case LIBINPUT_EVENT_POINTER_SCROLL_WHEEL:
handle_pointer_axis_value120(event, &dev->pointer,
WLR_AXIS_SOURCE_WHEEL);
break;
case LIBINPUT_EVENT_POINTER_SCROLL_FINGER:
handle_pointer_axis_value120(event, &dev->pointer,
WLR_AXIS_SOURCE_FINGER);
break;
case LIBINPUT_EVENT_POINTER_SCROLL_CONTINUOUS:
handle_pointer_axis_value120(event, &dev->pointer,
WLR_AXIS_SOURCE_CONTINUOUS);
break;
#endif
case LIBINPUT_EVENT_TOUCH_DOWN:
handle_touch_down(event, &dev->touch);
break;
case LIBINPUT_EVENT_TOUCH_UP:
handle_touch_up(event, &dev->touch);
break;
case LIBINPUT_EVENT_TOUCH_MOTION:
handle_touch_motion(event, &dev->touch);
break;
case LIBINPUT_EVENT_TOUCH_CANCEL:
handle_touch_cancel(event, &dev->touch);
break;
case LIBINPUT_EVENT_TOUCH_FRAME:
handle_touch_frame(event, &dev->touch);
break;
case LIBINPUT_EVENT_TABLET_TOOL_AXIS:
handle_tablet_tool_axis(event, &dev->tablet);
break;
case LIBINPUT_EVENT_TABLET_TOOL_PROXIMITY:
handle_tablet_tool_proximity(event, &dev->tablet);
break;
case LIBINPUT_EVENT_TABLET_TOOL_TIP:
handle_tablet_tool_tip(event, &dev->tablet);
break;
case LIBINPUT_EVENT_TABLET_TOOL_BUTTON:
handle_tablet_tool_button(event, &dev->tablet);
break;
case LIBINPUT_EVENT_TABLET_PAD_BUTTON:
handle_tablet_pad_button(event, &dev->tablet_pad);
break;
case LIBINPUT_EVENT_TABLET_PAD_RING:
handle_tablet_pad_ring(event, &dev->tablet_pad);
break;
case LIBINPUT_EVENT_TABLET_PAD_STRIP:
handle_tablet_pad_strip(event, &dev->tablet_pad);
break;
case LIBINPUT_EVENT_SWITCH_TOGGLE:
handle_switch_toggle(event, &dev->switch_device);
break;
case LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN:
handle_pointer_swipe_begin(event, &dev->pointer);
break;
case LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE:
handle_pointer_swipe_update(event, &dev->pointer);
break;
case LIBINPUT_EVENT_GESTURE_SWIPE_END:
handle_pointer_swipe_end(event, &dev->pointer);
break;
case LIBINPUT_EVENT_GESTURE_PINCH_BEGIN:
handle_pointer_pinch_begin(event, &dev->pointer);
break;
case LIBINPUT_EVENT_GESTURE_PINCH_UPDATE:
handle_pointer_pinch_update(event, &dev->pointer);
break;
case LIBINPUT_EVENT_GESTURE_PINCH_END:
handle_pointer_pinch_end(event, &dev->pointer);
break;
#if LIBINPUT_HAS_HOLD_GESTURES
case LIBINPUT_EVENT_GESTURE_HOLD_BEGIN:
handle_pointer_hold_begin(event, &dev->pointer);
break;
case LIBINPUT_EVENT_GESTURE_HOLD_END:
handle_pointer_hold_end(event, &dev->pointer);
break;
#endif
default:
wlr_log(WLR_DEBUG, "Unknown libinput event %d", event_type);
break;
}
}
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