IABSD.fr/xenocara/xserver/Xi/xigrabdev.c

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• Author : matthieu
  Date : 2025-06-29 05:21:57
  Hash : dd403c0a
  Message : Update to xserver 21.1.18. The security fixes have already been committed.

• xserver/Xi/xigrabdev.c

• /*
   * Copyright © 2009 Red Hat, Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   *
   * Author: Peter Hutterer
   */
  
  /***********************************************************************
   *
   * Request to grab or ungrab input device.
   *
   */
  
  #ifdef HAVE_DIX_CONFIG_H
  #include <dix-config.h>
  #endif
  
  #include "inputstr.h"           /* DeviceIntPtr      */
  #include "windowstr.h"          /* window structure  */
  #include <X11/extensions/XI2.h>
  #include <X11/extensions/XI2proto.h>
  
  #include "exglobals.h"          /* BadDevice */
  #include "exevents.h"
  #include "xigrabdev.h"
  #include "inpututils.h"
  
  int _X_COLD
  SProcXIGrabDevice(ClientPtr client)
  {
      REQUEST(xXIGrabDeviceReq);
      /*
       * Check here for at least the length of the struct we swap, then
       * let ProcXIGrabDevice check the full size after we swap mask_len.
       */
      REQUEST_AT_LEAST_SIZE(xXIGrabDeviceReq);
  
      swaps(&stuff->length);
      swaps(&stuff->deviceid);
      swapl(&stuff->grab_window);
      swapl(&stuff->cursor);
      swapl(&stuff->time);
      swaps(&stuff->mask_len);
  
      return ProcXIGrabDevice(client);
  }
  
  int
  ProcXIGrabDevice(ClientPtr client)
  {
      DeviceIntPtr dev;
      xXIGrabDeviceReply rep;
      int ret = Success;
      uint8_t status;
      GrabMask mask = { 0 };
      int mask_len;
      unsigned int keyboard_mode;
      unsigned int pointer_mode;
  
      REQUEST(xXIGrabDeviceReq);
      REQUEST_FIXED_SIZE(xXIGrabDeviceReq, ((size_t) stuff->mask_len) * 4);
  
      ret = dixLookupDevice(&dev, stuff->deviceid, client, DixGrabAccess);
      if (ret != Success)
          return ret;
  
      if (!dev->enabled)
          return AlreadyGrabbed;
  
      if (!IsMaster(dev))
          stuff->paired_device_mode = GrabModeAsync;
  
      if (IsKeyboardDevice(dev)) {
          keyboard_mode = stuff->grab_mode;
          pointer_mode = stuff->paired_device_mode;
      }
      else {
          keyboard_mode = stuff->paired_device_mode;
          pointer_mode = stuff->grab_mode;
      }
  
      if (XICheckInvalidMaskBits(client, (unsigned char *) &stuff[1],
                                 stuff->mask_len * 4) != Success)
          return BadValue;
  
      mask.xi2mask = xi2mask_new();
      if (!mask.xi2mask)
          return BadAlloc;
  
      mask_len = min(xi2mask_mask_size(mask.xi2mask), stuff->mask_len * 4);
      /* FIXME: I think the old code was broken here */
      xi2mask_set_one_mask(mask.xi2mask, dev->id, (unsigned char *) &stuff[1],
                           mask_len);
  
      ret = GrabDevice(client, dev, pointer_mode,
                       keyboard_mode,
                       stuff->grab_window,
                       stuff->owner_events,
                       stuff->time,
                       &mask, XI2, stuff->cursor, None /* confineTo */ ,
                       &status);
  
      xi2mask_free(&mask.xi2mask);
  
      if (ret != Success)
          return ret;
  
      rep = (xXIGrabDeviceReply) {
          .repType = X_Reply,
          .RepType = X_XIGrabDevice,
          .sequenceNumber = client->sequence,
          .length = 0,
          .status = status
      };
  
      WriteReplyToClient(client, sizeof(rep), &rep);
      return ret;
  }
  
  int _X_COLD
  SProcXIUngrabDevice(ClientPtr client)
  {
      REQUEST(xXIUngrabDeviceReq);
      REQUEST_SIZE_MATCH(xXIUngrabDeviceReq);
  
      swaps(&stuff->length);
      swaps(&stuff->deviceid);
      swapl(&stuff->time);
  
      return ProcXIUngrabDevice(client);
  }
  
  int
  ProcXIUngrabDevice(ClientPtr client)
  {
      DeviceIntPtr dev;
      GrabPtr grab;
      int ret = Success;
      TimeStamp time;
  
      REQUEST(xXIUngrabDeviceReq);
      REQUEST_SIZE_MATCH(xXIUngrabDeviceReq);
  
      ret = dixLookupDevice(&dev, stuff->deviceid, client, DixGetAttrAccess);
      if (ret != Success)
          return ret;
  
      grab = dev->deviceGrab.grab;
  
      time = ClientTimeToServerTime(stuff->time);
      if ((CompareTimeStamps(time, currentTime) != LATER) &&
          (CompareTimeStamps(time, dev->deviceGrab.grabTime) != EARLIER) &&
          (grab) && SameClient(grab, client) && grab->grabtype == XI2)
          (*dev->deviceGrab.DeactivateGrab) (dev);
  
      return Success;
  }
  
  void _X_COLD
  SRepXIGrabDevice(ClientPtr client, int size, xXIGrabDeviceReply * rep)
  {
      swaps(&rep->sequenceNumber);
      swapl(&rep->length);
      WriteToClient(client, size, rep);
  }