78e508c937
If there is a selection left over from a previous execution of the main loop, and that selection has privates allocated for it, the X server will crash. This is because dixResetPrivates() resets the privates refcounts to zero without accounting for the reference held by the selection object. When the selection is then deleted in InitSelections() after the call to dixResetPrivates(), the refcount for its privates type goes negative and bad things happen. To fix this, we should delete any existing selections before calling dixResetPrivates(). This will properly release the selection's privates and avoid the crash. A more thorough description of the problem and a test case to reproduce the crash is available at a previous mail: "Negative Selection devPrivates refcount?" By Andrew Eikum to xorg-devel on 10 Dec 2013 http://lists.freedesktop.org/archives/xorg-devel/2013-December/039492.html Signed-off-by: Andrew Eikum <aeikum@codeweavers.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Keith Packard <keithp@keithp.com>
385 lines
13 KiB
C
385 lines
13 KiB
C
/***********************************************************
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/* The panoramix components contained the following notice */
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/*****************************************************************
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Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
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BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Digital Equipment Corporation
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shall not be used in advertising or otherwise to promote the sale, use or other
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dealings in this Software without prior written authorization from Digital
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Equipment Corporation.
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******************************************************************/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#include <version-config.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xos.h> /* for unistd.h */
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#include <X11/Xproto.h>
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#include <pixman.h>
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#include "scrnintstr.h"
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#include "misc.h"
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#include "os.h"
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#include "windowstr.h"
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#include "resource.h"
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#include "dixstruct.h"
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#include "gcstruct.h"
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#include "extension.h"
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#include "colormap.h"
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#include "colormapst.h"
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#include "cursorstr.h"
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#include "selection.h"
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#include <X11/fonts/font.h>
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#include "opaque.h"
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#include "servermd.h"
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#include "hotplug.h"
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#include "site.h"
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#include "dixfont.h"
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#include "extnsionst.h"
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#include "privates.h"
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#include "registry.h"
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#include "client.h"
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#include "exevents.h"
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#ifdef PANORAMIX
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#include "panoramiXsrv.h"
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#else
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#include "dixevents.h" /* InitEvents() */
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#endif
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#ifdef DPMSExtension
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#include <X11/extensions/dpmsconst.h>
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#include "dpmsproc.h"
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#endif
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extern void Dispatch(void);
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#ifdef XQUARTZ
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#include <pthread.h>
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BOOL serverRunning = FALSE;
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pthread_mutex_t serverRunningMutex = PTHREAD_MUTEX_INITIALIZER;
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pthread_cond_t serverRunningCond = PTHREAD_COND_INITIALIZER;
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#endif
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int
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dix_main(int argc, char *argv[], char *envp[])
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{
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int i;
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HWEventQueueType alwaysCheckForInput[2];
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display = "0";
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InitRegions();
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CheckUserParameters(argc, argv, envp);
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CheckUserAuthorization();
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InitConnectionLimits();
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ProcessCommandLine(argc, argv);
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alwaysCheckForInput[0] = 0;
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alwaysCheckForInput[1] = 1;
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while (1) {
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serverGeneration++;
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ScreenSaverTime = defaultScreenSaverTime;
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ScreenSaverInterval = defaultScreenSaverInterval;
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ScreenSaverBlanking = defaultScreenSaverBlanking;
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ScreenSaverAllowExposures = defaultScreenSaverAllowExposures;
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#ifdef DPMSExtension
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DPMSStandbyTime = DPMSSuspendTime = DPMSOffTime = ScreenSaverTime;
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DPMSEnabled = TRUE;
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DPMSPowerLevel = 0;
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#endif
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InitBlockAndWakeupHandlers();
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/* Perform any operating system dependent initializations you'd like */
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OsInit();
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if (serverGeneration == 1) {
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CreateWellKnownSockets();
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for (i = 1; i < MAXCLIENTS; i++)
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clients[i] = NullClient;
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serverClient = calloc(sizeof(ClientRec), 1);
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if (!serverClient)
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FatalError("couldn't create server client");
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InitClient(serverClient, 0, (void *) NULL);
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}
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else
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ResetWellKnownSockets();
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clients[0] = serverClient;
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currentMaxClients = 1;
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/* clear any existing selections */
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InitSelections();
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/* Initialize privates before first allocation */
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dixResetPrivates();
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/* Initialize server client devPrivates, to be reallocated as
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* more client privates are registered
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*/
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if (!dixAllocatePrivates(&serverClient->devPrivates, PRIVATE_CLIENT))
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FatalError("failed to create server client privates");
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if (!InitClientResources(serverClient)) /* for root resources */
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FatalError("couldn't init server resources");
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SetInputCheck(&alwaysCheckForInput[0], &alwaysCheckForInput[1]);
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screenInfo.numScreens = 0;
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InitAtoms();
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InitEvents();
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InitGlyphCaching();
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dixResetRegistry();
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ResetFontPrivateIndex();
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InitCallbackManager();
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InitOutput(&screenInfo, argc, argv);
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if (screenInfo.numScreens < 1)
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FatalError("no screens found");
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InitExtensions(argc, argv);
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for (i = 0; i < screenInfo.numGPUScreens; i++) {
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ScreenPtr pScreen = screenInfo.gpuscreens[i];
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if (!CreateScratchPixmapsForScreen(pScreen))
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FatalError("failed to create scratch pixmaps");
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if (pScreen->CreateScreenResources &&
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!(*pScreen->CreateScreenResources) (pScreen))
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FatalError("failed to create screen resources");
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}
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for (i = 0; i < screenInfo.numScreens; i++) {
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ScreenPtr pScreen = screenInfo.screens[i];
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if (!CreateScratchPixmapsForScreen(pScreen))
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FatalError("failed to create scratch pixmaps");
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if (pScreen->CreateScreenResources &&
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!(*pScreen->CreateScreenResources) (pScreen))
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FatalError("failed to create screen resources");
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if (!CreateGCperDepth(i))
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FatalError("failed to create scratch GCs");
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if (!CreateDefaultStipple(i))
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FatalError("failed to create default stipple");
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if (!CreateRootWindow(pScreen))
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FatalError("failed to create root window");
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}
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InitFonts();
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if (SetDefaultFontPath(defaultFontPath) != Success) {
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ErrorF("[dix] failed to set default font path '%s'",
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defaultFontPath);
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}
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if (!SetDefaultFont(defaultTextFont)) {
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FatalError("could not open default font '%s'", defaultTextFont);
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}
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if (!(rootCursor = CreateRootCursor(NULL, 0))) {
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FatalError("could not open default cursor font '%s'",
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defaultCursorFont);
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}
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#ifdef DPMSExtension
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/* check all screens, looking for DPMS Capabilities */
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DPMSCapableFlag = DPMSSupported();
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if (!DPMSCapableFlag)
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DPMSEnabled = FALSE;
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#endif
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#ifdef PANORAMIX
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/*
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* Consolidate window and colourmap information for each screen
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*/
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if (!noPanoramiXExtension)
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PanoramiXConsolidate();
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#endif
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for (i = 0; i < screenInfo.numScreens; i++)
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InitRootWindow(screenInfo.screens[i]->root);
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InitCoreDevices();
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InitInput(argc, argv);
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InitAndStartDevices();
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ReserveClientIds(serverClient);
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dixSaveScreens(serverClient, SCREEN_SAVER_FORCER, ScreenSaverReset);
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#ifdef PANORAMIX
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if (!noPanoramiXExtension) {
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if (!PanoramiXCreateConnectionBlock()) {
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FatalError("could not create connection block info");
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}
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}
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else
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#endif
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{
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if (!CreateConnectionBlock()) {
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FatalError("could not create connection block info");
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}
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}
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#ifdef XQUARTZ
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/* Let the other threads know the server is done with its init */
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pthread_mutex_lock(&serverRunningMutex);
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serverRunning = TRUE;
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pthread_cond_broadcast(&serverRunningCond);
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pthread_mutex_unlock(&serverRunningMutex);
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#endif
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NotifyParentProcess();
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Dispatch();
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#ifdef XQUARTZ
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/* Let the other threads know the server is no longer running */
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pthread_mutex_lock(&serverRunningMutex);
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serverRunning = FALSE;
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pthread_mutex_unlock(&serverRunningMutex);
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#endif
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UndisplayDevices();
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DisableAllDevices();
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/* Now free up whatever must be freed */
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if (screenIsSaved == SCREEN_SAVER_ON)
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dixSaveScreens(serverClient, SCREEN_SAVER_OFF, ScreenSaverReset);
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FreeScreenSaverTimer();
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CloseDownExtensions();
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#ifdef PANORAMIX
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{
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Bool remember_it = noPanoramiXExtension;
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noPanoramiXExtension = TRUE;
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FreeAllResources();
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noPanoramiXExtension = remember_it;
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}
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#else
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FreeAllResources();
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#endif
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CloseInput();
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for (i = 0; i < screenInfo.numScreens; i++)
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screenInfo.screens[i]->root = NullWindow;
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CloseDownDevices();
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CloseDownEvents();
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for (i = screenInfo.numGPUScreens - 1; i >= 0; i--) {
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ScreenPtr pScreen = screenInfo.gpuscreens[i];
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FreeScratchPixmapsForScreen(pScreen);
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(*pScreen->CloseScreen) (pScreen);
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dixFreePrivates(pScreen->devPrivates, PRIVATE_SCREEN);
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free(pScreen);
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screenInfo.numGPUScreens = i;
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}
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for (i = screenInfo.numScreens - 1; i >= 0; i--) {
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FreeScratchPixmapsForScreen(screenInfo.screens[i]);
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FreeGCperDepth(i);
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FreeDefaultStipple(i);
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dixFreeScreenSpecificPrivates(screenInfo.screens[i]);
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(*screenInfo.screens[i]->CloseScreen) (screenInfo.screens[i]);
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dixFreePrivates(screenInfo.screens[i]->devPrivates, PRIVATE_SCREEN);
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free(screenInfo.screens[i]);
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screenInfo.numScreens = i;
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}
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ReleaseClientIds(serverClient);
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dixFreePrivates(serverClient->devPrivates, PRIVATE_CLIENT);
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serverClient->devPrivates = NULL;
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dixFreeRegistry();
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FreeFonts();
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FreeAllAtoms();
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FreeAuditTimer();
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DeleteCallbackManager();
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if (dispatchException & DE_TERMINATE) {
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CloseWellKnownConnections();
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}
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OsCleanup((dispatchException & DE_TERMINATE) != 0);
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if (dispatchException & DE_TERMINATE) {
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ddxGiveUp(EXIT_NO_ERROR);
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break;
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}
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free(ConnectionInfo);
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ConnectionInfo = NULL;
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}
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return 0;
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}
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