MSVSphere Packaging Team
11 months ago
parent
1b1a6ca326
commit
ae02505d3f
@ -0,0 +1,13 @@
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diff --git a/unix/xserver/hw/vnc/vncInput.c b/unix/xserver/hw/vnc/vncInput.c
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index b3d0926d..d36a096f 100644
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--- a/unix/xserver/hw/vnc/vncInput.c
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+++ b/unix/xserver/hw/vnc/vncInput.c
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@@ -167,7 +167,7 @@ void vncPointerMove(int x, int y)
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void vncGetPointerPos(int *x, int *y)
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{
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- if (vncPointerDev != NULL) {
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+ if (vncPointerDev != NULL && !IsFloating(vncPointerDev)) {
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ScreenPtr ptrScreen;
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miPointerGetPosition(vncPointerDev, &cursorPosX, &cursorPosY);
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@ -0,0 +1,51 @@
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From 77e294797db17845808462b588d4e7a2130196bc Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Thu, 14 Dec 2023 11:29:49 +1000
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Subject: [PATCH xserver] dix: allocate enough space for logical button maps
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Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for
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each logical button currently down. Since buttons can be arbitrarily mapped
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to anything up to 255 make sure we have enough bits for the maximum mapping.
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CVE-2023-6816, ZDI-CAN-22664, ZDI-CAN-22665
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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---
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Xi/xiquerypointer.c | 3 +--
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dix/enterleave.c | 5 +++--
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2 files changed, 4 insertions(+), 4 deletions(-)
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diff --git a/Xi/xiquerypointer.c b/Xi/xiquerypointer.c
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index 5b77b1a444..2b05ac5f39 100644
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--- a/Xi/xiquerypointer.c
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+++ b/Xi/xiquerypointer.c
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@@ -149,8 +149,7 @@ ProcXIQueryPointer(ClientPtr client)
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if (pDev->button) {
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int i;
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- rep.buttons_len =
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- bytes_to_int32(bits_to_bytes(pDev->button->numButtons));
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+ rep.buttons_len = bytes_to_int32(bits_to_bytes(256)); /* button map up to 255 */
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rep.length += rep.buttons_len;
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buttons = calloc(rep.buttons_len, 4);
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if (!buttons)
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diff --git a/dix/enterleave.c b/dix/enterleave.c
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index 867ec74363..ded8679d76 100644
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--- a/dix/enterleave.c
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+++ b/dix/enterleave.c
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@@ -784,8 +784,9 @@ DeviceFocusEvent(DeviceIntPtr dev, int type, int mode, int detail,
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mouse = IsFloating(dev) ? dev : GetMaster(dev, MASTER_POINTER);
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- /* XI 2 event */
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- btlen = (mouse->button) ? bits_to_bytes(mouse->button->numButtons) : 0;
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+ /* XI 2 event contains the logical button map - maps are CARD8
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+ * so we need 256 bits for the possibly maximum mapping */
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+ btlen = (mouse->button) ? bits_to_bytes(256) : 0;
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btlen = bytes_to_int32(btlen);
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len = sizeof(xXIFocusInEvent) + btlen * 4;
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--
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2.43.0
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@ -0,0 +1,84 @@
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From 45ea0a93934c8a3760a4d68ba4ffc932375f60de Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Mon, 18 Dec 2023 14:27:50 +1000
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Subject: [PATCH xserver 1/2] dix: Allocate sufficient xEvents for our
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DeviceStateNotify
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If a device has both a button class and a key class and numButtons is
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zero, we can get an OOB write due to event under-allocation.
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This function seems to assume a device has either keys or buttons, not
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both. It has two virtually identical code paths, both of which assume
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they're applying to the first event in the sequence.
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A device with both a key and button class triggered a logic bug - only
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one xEvent was allocated but the deviceStateNotify pointer was pushed on
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once per type. So effectively this logic code:
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int count = 1;
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if (button && nbuttons > 32) count++;
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if (key && nbuttons > 0) count++;
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if (key && nkeys > 32) count++; // this is basically always true
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// count is at 2 for our keys + zero button device
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ev = alloc(count * sizeof(xEvent));
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FixDeviceStateNotify(ev);
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if (button)
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FixDeviceStateNotify(ev++);
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if (key)
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FixDeviceStateNotify(ev++); // santa drops into the wrong chimney here
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If the device has more than 3 valuators, the OOB is pushed back - we're
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off by one so it will happen when the last deviceValuator event is
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written instead.
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Fix this by allocating the maximum number of events we may allocate.
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Note that the current behavior is not protocol-correct anyway, this
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patch fixes only the allocation issue.
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Note that this issue does not trigger if the device has at least one
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button. While the server does not prevent a button class with zero
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buttons, it is very unlikely.
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CVE-2024-0229, ZDI-CAN-22678
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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---
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dix/enterleave.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/dix/enterleave.c b/dix/enterleave.c
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index ded8679d76..17964b00a4 100644
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--- a/dix/enterleave.c
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+++ b/dix/enterleave.c
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@@ -675,7 +675,8 @@ static void
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DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
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{
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int evcount = 1;
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- deviceStateNotify *ev, *sev;
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+ deviceStateNotify sev[6 + (MAX_VALUATORS + 2)/3];
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+ deviceStateNotify *ev;
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deviceKeyStateNotify *kev;
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deviceButtonStateNotify *bev;
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@@ -714,7 +715,7 @@ DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
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}
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}
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- sev = ev = xallocarray(evcount, sizeof(xEvent));
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+ ev = sev;
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FixDeviceStateNotify(dev, ev, NULL, NULL, NULL, first);
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if (b != NULL) {
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@@ -770,7 +771,6 @@ DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
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DeliverEventsToWindow(dev, win, (xEvent *) sev, evcount,
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DeviceStateNotifyMask, NullGrab);
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- free(sev);
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}
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void
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--
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2.43.0
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@ -0,0 +1,216 @@
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From 4c7a16b089b721b9c07f4ed593deba4f22158dbf Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Mon, 18 Dec 2023 12:26:20 +1000
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Subject: [PATCH xserver 2/2] dix: fix DeviceStateNotify event calculation
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The previous code only made sense if one considers buttons and keys to
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be mutually exclusive on a device. That is not necessarily true, causing
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a number of issues.
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This function allocates and fills in the number of xEvents we need to
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send the device state down the wire. This is split across multiple
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32-byte devices including one deviceStateNotify event and optional
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deviceKeyStateNotify, deviceButtonStateNotify and (possibly multiple)
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deviceValuator events.
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The previous behavior would instead compose a sequence
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of [state, buttonstate, state, keystate, valuator...]. This is not
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protocol correct, and on top of that made the code extremely convoluted.
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Fix this by streamlining: add both button and key into the deviceStateNotify
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and then append the key state and button state, followed by the
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valuators. Finally, the deviceValuator events contain up to 6 valuators
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per event but we only ever sent through 3 at a time. Let's double that
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troughput.
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CVE-2024-0229, ZDI-CAN-22678
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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---
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dix/enterleave.c | 119 ++++++++++++++++++++---------------------------
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1 file changed, 51 insertions(+), 68 deletions(-)
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diff --git a/dix/enterleave.c b/dix/enterleave.c
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index 17964b00a4..7b7ba1098b 100644
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--- a/dix/enterleave.c
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+++ b/dix/enterleave.c
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@@ -615,9 +615,15 @@ FixDeviceValuator(DeviceIntPtr dev, deviceValuator * ev, ValuatorClassPtr v,
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ev->type = DeviceValuator;
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ev->deviceid = dev->id;
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- ev->num_valuators = nval < 3 ? nval : 3;
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+ ev->num_valuators = nval < 6 ? nval : 6;
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ev->first_valuator = first;
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switch (ev->num_valuators) {
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+ case 6:
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+ ev->valuator5 = v->axisVal[first + 5];
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+ case 5:
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+ ev->valuator4 = v->axisVal[first + 4];
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+ case 4:
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+ ev->valuator3 = v->axisVal[first + 3];
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case 3:
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ev->valuator2 = v->axisVal[first + 2];
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case 2:
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@@ -626,7 +632,6 @@ FixDeviceValuator(DeviceIntPtr dev, deviceValuator * ev, ValuatorClassPtr v,
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ev->valuator0 = v->axisVal[first];
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break;
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}
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- first += ev->num_valuators;
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}
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static void
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@@ -646,7 +651,7 @@ FixDeviceStateNotify(DeviceIntPtr dev, deviceStateNotify * ev, KeyClassPtr k,
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ev->num_buttons = b->numButtons;
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memcpy((char *) ev->buttons, (char *) b->down, 4);
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}
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- else if (k) {
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+ if (k) {
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ev->classes_reported |= (1 << KeyClass);
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ev->num_keys = k->xkbInfo->desc->max_key_code -
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k->xkbInfo->desc->min_key_code;
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@@ -670,15 +675,26 @@ FixDeviceStateNotify(DeviceIntPtr dev, deviceStateNotify * ev, KeyClassPtr k,
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}
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}
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-
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+/**
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+ * The device state notify event is split across multiple 32-byte events.
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+ * The first one contains the first 32 button state bits, the first 32
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+ * key state bits, and the first 3 valuator values.
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+ *
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+ * If a device has more than that, the server sends out:
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+ * - one deviceButtonStateNotify for buttons 32 and above
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+ * - one deviceKeyStateNotify for keys 32 and above
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+ * - one deviceValuator event per 6 valuators above valuator 4
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+ *
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+ * All events but the last one have the deviceid binary ORed with MORE_EVENTS,
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+ */
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static void
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DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
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{
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+ /* deviceStateNotify, deviceKeyStateNotify, deviceButtonStateNotify
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+ * and one deviceValuator for each 6 valuators */
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+ deviceStateNotify sev[3 + (MAX_VALUATORS + 6)/6];
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int evcount = 1;
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- deviceStateNotify sev[6 + (MAX_VALUATORS + 2)/3];
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- deviceStateNotify *ev;
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- deviceKeyStateNotify *kev;
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- deviceButtonStateNotify *bev;
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+ deviceStateNotify *ev = sev;
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KeyClassPtr k;
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ButtonClassPtr b;
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@@ -691,82 +707,49 @@ DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
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if ((b = dev->button) != NULL) {
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nbuttons = b->numButtons;
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- if (nbuttons > 32)
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+ if (nbuttons > 32) /* first 32 are encoded in deviceStateNotify */
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evcount++;
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}
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if ((k = dev->key) != NULL) {
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nkeys = k->xkbInfo->desc->max_key_code - k->xkbInfo->desc->min_key_code;
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- if (nkeys > 32)
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+ if (nkeys > 32) /* first 32 are encoded in deviceStateNotify */
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evcount++;
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- if (nbuttons > 0) {
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- evcount++;
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- }
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}
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if ((v = dev->valuator) != NULL) {
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nval = v->numAxes;
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-
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- if (nval > 3)
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- evcount++;
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- if (nval > 6) {
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- if (!(k && b))
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- evcount++;
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- if (nval > 9)
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- evcount += ((nval - 7) / 3);
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- }
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+ /* first three are encoded in deviceStateNotify, then
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+ * it's 6 per deviceValuator event */
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+ evcount += ((nval - 3) + 6)/6;
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}
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- ev = sev;
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- FixDeviceStateNotify(dev, ev, NULL, NULL, NULL, first);
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+ BUG_RETURN(evcount <= ARRAY_SIZE(sev));
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- if (b != NULL) {
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- FixDeviceStateNotify(dev, ev++, NULL, b, v, first);
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- first += 3;
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- nval -= 3;
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- if (nbuttons > 32) {
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- (ev - 1)->deviceid |= MORE_EVENTS;
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- bev = (deviceButtonStateNotify *) ev++;
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- bev->type = DeviceButtonStateNotify;
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- bev->deviceid = dev->id;
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- memcpy((char *) &bev->buttons[4], (char *) &b->down[4],
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- DOWN_LENGTH - 4);
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- }
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- if (nval > 0) {
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- (ev - 1)->deviceid |= MORE_EVENTS;
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- FixDeviceValuator(dev, (deviceValuator *) ev++, v, first);
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- first += 3;
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- nval -= 3;
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- }
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+ FixDeviceStateNotify(dev, ev, k, b, v, first);
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+
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+ if (b != NULL && nbuttons > 32) {
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+ deviceButtonStateNotify *bev = (deviceButtonStateNotify *) ++ev;
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+ (ev - 1)->deviceid |= MORE_EVENTS;
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+ bev->type = DeviceButtonStateNotify;
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+ bev->deviceid = dev->id;
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+ memcpy((char *) &bev->buttons[4], (char *) &b->down[4],
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+ DOWN_LENGTH - 4);
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}
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- if (k != NULL) {
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- FixDeviceStateNotify(dev, ev++, k, NULL, v, first);
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- first += 3;
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- nval -= 3;
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- if (nkeys > 32) {
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- (ev - 1)->deviceid |= MORE_EVENTS;
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- kev = (deviceKeyStateNotify *) ev++;
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- kev->type = DeviceKeyStateNotify;
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- kev->deviceid = dev->id;
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- memmove((char *) &kev->keys[0], (char *) &k->down[4], 28);
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- }
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- if (nval > 0) {
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- (ev - 1)->deviceid |= MORE_EVENTS;
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- FixDeviceValuator(dev, (deviceValuator *) ev++, v, first);
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- first += 3;
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- nval -= 3;
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- }
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+ if (k != NULL && nkeys > 32) {
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+ deviceKeyStateNotify *kev = (deviceKeyStateNotify *) ++ev;
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+ (ev - 1)->deviceid |= MORE_EVENTS;
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+ kev->type = DeviceKeyStateNotify;
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+ kev->deviceid = dev->id;
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+ memmove((char *) &kev->keys[0], (char *) &k->down[4], 28);
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}
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+ first = 3;
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+ nval -= 3;
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while (nval > 0) {
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- FixDeviceStateNotify(dev, ev++, NULL, NULL, v, first);
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- first += 3;
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- nval -= 3;
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- if (nval > 0) {
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- (ev - 1)->deviceid |= MORE_EVENTS;
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- FixDeviceValuator(dev, (deviceValuator *) ev++, v, first);
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- first += 3;
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- nval -= 3;
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- }
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+ ev->deviceid |= MORE_EVENTS;
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+ FixDeviceValuator(dev, (deviceValuator *) ++ev, v, first);
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+ first += 6;
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+ nval -= 6;
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}
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DeliverEventsToWindow(dev, win, (xEvent *) sev, evcount,
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--
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2.43.0
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@ -0,0 +1,37 @@
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From 061eb684996627347acdf87ec11d108cedee71b6 Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Thu, 21 Dec 2023 13:48:10 +1000
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Subject: [PATCH xserver] Xi: when creating a new ButtonClass, set the number
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of buttons
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There's a racy sequence where a master device may copy the button class
|
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from the slave, without ever initializing numButtons. This leads to a
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device with zero buttons but a button class which is invalid.
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|
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Let's copy the numButtons value from the source - by definition if we
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don't have a button class yet we do not have any other slave devices
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with more than this number of buttons anyway.
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CVE-2024-0229, ZDI-CAN-22678
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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---
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Xi/exevents.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/Xi/exevents.c b/Xi/exevents.c
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index 54ea11a938..e161714682 100644
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--- a/Xi/exevents.c
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+++ b/Xi/exevents.c
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@@ -605,6 +605,7 @@ DeepCopyPointerClasses(DeviceIntPtr from, DeviceIntPtr to)
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to->button = calloc(1, sizeof(ButtonClassRec));
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if (!to->button)
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FatalError("[Xi] no memory for class shift.\n");
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+ to->button->numButtons = from->button->numButtons;
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}
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else
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classes->button = NULL;
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--
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2.43.0
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@ -0,0 +1,109 @@
|
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From a483b5c7724469309e3df427730cbb8b805b9c9f Mon Sep 17 00:00:00 2001
|
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Thu, 4 Jan 2024 10:01:24 +1000
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Subject: [PATCH xserver] Xi: flush hierarchy events after adding/removing
|
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master devices
|
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|
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The `XISendDeviceHierarchyEvent()` function allocates space to store up
|
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to `MAXDEVICES` (256) `xXIHierarchyInfo` structures in `info`.
|
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|
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If a device with a given ID was removed and a new device with the same
|
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ID added both in the same operation, the single device ID will lead to
|
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two info structures being written to `info`.
|
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|
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Since this case can occur for every device ID at once, a total of two
|
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times `MAXDEVICES` info structures might be written to the allocation.
|
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|
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To avoid it, once one add/remove master is processed, send out the
|
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device hierarchy event for the current state and continue. That event
|
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thus only ever has exactly one of either added/removed in it (and
|
||||
optionally slave attached/detached).
|
||||
|
||||
CVE-2024-21885, ZDI-CAN-22744
|
||||
|
||||
This vulnerability was discovered by:
|
||||
Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
|
||||
---
|
||||
Xi/xichangehierarchy.c | 30 ++++++++++++++++++++++++------
|
||||
1 file changed, 24 insertions(+), 6 deletions(-)
|
||||
|
||||
diff --git a/Xi/xichangehierarchy.c b/Xi/xichangehierarchy.c
|
||||
index 01eb7a8af4..67eedddec6 100644
|
||||
--- a/Xi/xichangehierarchy.c
|
||||
+++ b/Xi/xichangehierarchy.c
|
||||
@@ -340,6 +340,11 @@ ProcXIChangeHierarchy(ClientPtr client)
|
||||
size_t len; /* length of data remaining in request */
|
||||
int rc = Success;
|
||||
int flags[MAXDEVICES] = { 0 };
|
||||
+ enum {
|
||||
+ NO_CHANGE,
|
||||
+ FLUSH,
|
||||
+ CHANGED,
|
||||
+ } changes = NO_CHANGE;
|
||||
|
||||
REQUEST(xXIChangeHierarchyReq);
|
||||
REQUEST_AT_LEAST_SIZE(xXIChangeHierarchyReq);
|
||||
@@ -389,8 +394,9 @@ ProcXIChangeHierarchy(ClientPtr client)
|
||||
rc = add_master(client, c, flags);
|
||||
if (rc != Success)
|
||||
goto unwind;
|
||||
- }
|
||||
+ changes = FLUSH;
|
||||
break;
|
||||
+ }
|
||||
case XIRemoveMaster:
|
||||
{
|
||||
xXIRemoveMasterInfo *r = (xXIRemoveMasterInfo *) any;
|
||||
@@ -399,8 +405,9 @@ ProcXIChangeHierarchy(ClientPtr client)
|
||||
rc = remove_master(client, r, flags);
|
||||
if (rc != Success)
|
||||
goto unwind;
|
||||
- }
|
||||
+ changes = FLUSH;
|
||||
break;
|
||||
+ }
|
||||
case XIDetachSlave:
|
||||
{
|
||||
xXIDetachSlaveInfo *c = (xXIDetachSlaveInfo *) any;
|
||||
@@ -409,8 +416,9 @@ ProcXIChangeHierarchy(ClientPtr client)
|
||||
rc = detach_slave(client, c, flags);
|
||||
if (rc != Success)
|
||||
goto unwind;
|
||||
- }
|
||||
+ changes = CHANGED;
|
||||
break;
|
||||
+ }
|
||||
case XIAttachSlave:
|
||||
{
|
||||
xXIAttachSlaveInfo *c = (xXIAttachSlaveInfo *) any;
|
||||
@@ -495,16 +503,25 @@ ProcXIChangeHierarchy(ClientPtr client)
|
||||
rc = attach_slave(client, c, flags);
|
||||
if (rc != Success)
|
||||
goto unwind;
|
||||
+ changes = CHANGED;
|
||||
+ break;
|
||||
}
|
||||
+ default:
|
||||
break;
|
||||
}
|
||||
|
||||
+ if (changes == FLUSH) {
|
||||
+ XISendDeviceHierarchyEvent(flags);
|
||||
+ memset(flags, 0, sizeof(flags));
|
||||
+ changes = NO_CHANGE;
|
||||
+ }
|
||||
+
|
||||
len -= any->length * 4;
|
||||
any = (xXIAnyHierarchyChangeInfo *) ((char *) any + any->length * 4);
|
||||
}
|
||||
|
||||
unwind:
|
||||
-
|
||||
- XISendDeviceHierarchyEvent(flags);
|
||||
+ if (changes != NO_CHANGE)
|
||||
+ XISendDeviceHierarchyEvent(flags);
|
||||
return rc;
|
||||
}
|
||||
--
|
||||
2.43.0
|
||||
|
||||
@ -0,0 +1,70 @@
|
||||
From 4e0e99ef60f07757756913221847a26c71afc3e8 Mon Sep 17 00:00:00 2001
|
||||
From: =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= <jexposit@redhat.com>
|
||||
Date: Fri, 22 Dec 2023 18:28:31 +0100
|
||||
Subject: [PATCH] Xi: do not keep linked list pointer during recursion
|
||||
|
||||
The `DisableDevice()` function is called whenever an enabled device
|
||||
is disabled and it moves the device from the `inputInfo.devices` linked
|
||||
list to the `inputInfo.off_devices` linked list.
|
||||
|
||||
However, its link/unlink operation has an issue during the recursive
|
||||
call to `DisableDevice()` due to the `prev` pointer pointing to a
|
||||
removed device.
|
||||
|
||||
This issue leads to a length mismatch between the total number of
|
||||
devices and the number of device in the list, leading to a heap
|
||||
overflow and, possibly, to local privilege escalation.
|
||||
|
||||
Simplify the code that checked whether the device passed to
|
||||
`DisableDevice()` was in `inputInfo.devices` or not and find the
|
||||
previous device after the recursion.
|
||||
|
||||
CVE-2024-21886, ZDI-CAN-22840
|
||||
|
||||
This vulnerability was discovered by:
|
||||
Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
|
||||
---
|
||||
dix/devices.c | 15 ++++++++++++---
|
||||
1 file changed, 12 insertions(+), 3 deletions(-)
|
||||
|
||||
diff --git a/dix/devices.c b/dix/devices.c
|
||||
index 3f3224d62..3a64d8702 100644
|
||||
--- a/dix/devices.c
|
||||
+++ b/dix/devices.c
|
||||
@@ -451,14 +451,20 @@ DisableDevice(DeviceIntPtr dev, BOOL sendevent)
|
||||
{
|
||||
DeviceIntPtr *prev, other;
|
||||
BOOL enabled;
|
||||
+ BOOL dev_in_devices_list = FALSE;
|
||||
int flags[MAXDEVICES] = { 0 };
|
||||
|
||||
if (!dev->enabled)
|
||||
return TRUE;
|
||||
|
||||
- for (prev = &inputInfo.devices;
|
||||
- *prev && (*prev != dev); prev = &(*prev)->next);
|
||||
- if (*prev != dev)
|
||||
+ for (other = inputInfo.devices; other; other = other->next) {
|
||||
+ if (other == dev) {
|
||||
+ dev_in_devices_list = TRUE;
|
||||
+ break;
|
||||
+ }
|
||||
+ }
|
||||
+
|
||||
+ if (!dev_in_devices_list)
|
||||
return FALSE;
|
||||
|
||||
TouchEndPhysicallyActiveTouches(dev);
|
||||
@@ -509,6 +515,9 @@ DisableDevice(DeviceIntPtr dev, BOOL sendevent)
|
||||
LeaveWindow(dev);
|
||||
SetFocusOut(dev);
|
||||
|
||||
+ for (prev = &inputInfo.devices;
|
||||
+ *prev && (*prev != dev); prev = &(*prev)->next);
|
||||
+
|
||||
*prev = dev->next;
|
||||
dev->next = inputInfo.off_devices;
|
||||
inputInfo.off_devices = dev;
|
||||
--
|
||||
2.43.0
|
||||
|
||||
@ -0,0 +1,53 @@
|
||||
From 1a5e3c3e68d4f965077ea6a40ba57cc0d5a4e8cb Mon Sep 17 00:00:00 2001
|
||||
From: Peter Hutterer <peter.hutterer@who-t.net>
|
||||
Date: Fri, 5 Jan 2024 09:40:27 +1000
|
||||
Subject: [PATCH xserver] dix: when disabling a master, float disabled slaved
|
||||
devices too
|
||||
|
||||
Disabling a master device floats all slave devices but we didn't do this
|
||||
to already-disabled slave devices. As a result those devices kept their
|
||||
reference to the master device resulting in access to already freed
|
||||
memory if the master device was removed before the corresponding slave
|
||||
device.
|
||||
|
||||
And to match this behavior, also forcibly reset that pointer during
|
||||
CloseDownDevices().
|
||||
|
||||
Related to CVE-2024-21886, ZDI-CAN-22840
|
||||
---
|
||||
dix/devices.c | 12 ++++++++++++
|
||||
1 file changed, 12 insertions(+)
|
||||
|
||||
diff --git a/dix/devices.c b/dix/devices.c
|
||||
index c7fa8fad69..87f4d4a213 100644
|
||||
--- a/dix/devices.c
|
||||
+++ b/dix/devices.c
|
||||
@@ -482,6 +482,13 @@ DisableDevice(DeviceIntPtr dev, BOOL sendevent)
|
||||
flags[other->id] |= XISlaveDetached;
|
||||
}
|
||||
}
|
||||
+
|
||||
+ for (other = inputInfo.off_devices; other; other = other->next) {
|
||||
+ if (!IsMaster(other) && GetMaster(other, MASTER_ATTACHED) == dev) {
|
||||
+ AttachDevice(NULL, other, NULL);
|
||||
+ flags[other->id] |= XISlaveDetached;
|
||||
+ }
|
||||
+ }
|
||||
}
|
||||
else {
|
||||
for (other = inputInfo.devices; other; other = other->next) {
|
||||
@@ -1088,6 +1095,11 @@ CloseDownDevices(void)
|
||||
dev->master = NULL;
|
||||
}
|
||||
|
||||
+ for (dev = inputInfo.off_devices; dev; dev = dev->next) {
|
||||
+ if (!IsMaster(dev) && !IsFloating(dev))
|
||||
+ dev->master = NULL;
|
||||
+ }
|
||||
+
|
||||
CloseDeviceList(&inputInfo.devices);
|
||||
CloseDeviceList(&inputInfo.off_devices);
|
||||
|
||||
--
|
||||
2.43.0
|
||||
|
||||
@ -0,0 +1,77 @@
|
||||
From 1801fe0ac3926882d47d7e1ad6c0518a2cdffd41 Mon Sep 17 00:00:00 2001
|
||||
From: Povilas Kanapickas <povilas@radix.lt>
|
||||
Date: Sun, 19 Dec 2021 18:11:07 +0200
|
||||
Subject: [PATCH] dix: Fix use after free in input device shutdown
|
||||
|
||||
This fixes access to freed heap memory via dev->master. E.g. when
|
||||
running BarrierNotify.ReceivesNotifyEvents/7 test from
|
||||
xorg-integration-tests:
|
||||
|
||||
==24736==ERROR: AddressSanitizer: heap-use-after-free on address
|
||||
0x619000065020 at pc 0x55c450e2b9cf bp 0x7fffc532fd20 sp 0x7fffc532fd10
|
||||
READ of size 4 at 0x619000065020 thread T0
|
||||
#0 0x55c450e2b9ce in GetMaster ../../../dix/devices.c:2722
|
||||
#1 0x55c450e9d035 in IsFloating ../../../dix/events.c:346
|
||||
#2 0x55c4513209c6 in GetDeviceUse ../../../Xi/xiquerydevice.c:525
|
||||
../../../Xi/xichangehierarchy.c:95
|
||||
#4 0x55c450e3455c in RemoveDevice ../../../dix/devices.c:1204
|
||||
../../../hw/xfree86/common/xf86Xinput.c:1142
|
||||
#6 0x55c450e17b04 in CloseDeviceList ../../../dix/devices.c:1038
|
||||
#7 0x55c450e1de85 in CloseDownDevices ../../../dix/devices.c:1068
|
||||
#8 0x55c450e837ef in dix_main ../../../dix/main.c:302
|
||||
#9 0x55c4517a8d93 in main ../../../dix/stubmain.c:34
|
||||
(/lib/x86_64-linux-gnu/libc.so.6+0x28564)
|
||||
#11 0x55c450d0113d in _start (/usr/lib/xorg/Xorg+0x117713d)
|
||||
|
||||
0x619000065020 is located 160 bytes inside of 912-byte region
|
||||
[0x619000064f80,0x619000065310)
|
||||
freed by thread T0 here:
|
||||
(/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10d7cf)
|
||||
#1 0x55c450e19f1c in CloseDevice ../../../dix/devices.c:1014
|
||||
#2 0x55c450e343a4 in RemoveDevice ../../../dix/devices.c:1186
|
||||
../../../hw/xfree86/common/xf86Xinput.c:1142
|
||||
#4 0x55c450e17b04 in CloseDeviceList ../../../dix/devices.c:1038
|
||||
#5 0x55c450e1de85 in CloseDownDevices ../../../dix/devices.c:1068
|
||||
#6 0x55c450e837ef in dix_main ../../../dix/main.c:302
|
||||
#7 0x55c4517a8d93 in main ../../../dix/stubmain.c:34
|
||||
(/lib/x86_64-linux-gnu/libc.so.6+0x28564)
|
||||
|
||||
previously allocated by thread T0 here:
|
||||
(/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10ddc6)
|
||||
#1 0x55c450e1c57b in AddInputDevice ../../../dix/devices.c:259
|
||||
#2 0x55c450e34840 in AllocDevicePair ../../../dix/devices.c:2755
|
||||
#3 0x55c45130318f in add_master ../../../Xi/xichangehierarchy.c:152
|
||||
../../../Xi/xichangehierarchy.c:465
|
||||
#5 0x55c4512cb9f5 in ProcIDispatch ../../../Xi/extinit.c:390
|
||||
#6 0x55c450e6a92b in Dispatch ../../../dix/dispatch.c:551
|
||||
#7 0x55c450e834b7 in dix_main ../../../dix/main.c:272
|
||||
#8 0x55c4517a8d93 in main ../../../dix/stubmain.c:34
|
||||
(/lib/x86_64-linux-gnu/libc.so.6+0x28564)
|
||||
|
||||
The problem is caused by dev->master being not reset when disabling the
|
||||
device, which then causes dangling pointer when the master device itself
|
||||
is being deleted when exiting whole server.
|
||||
|
||||
Note that RecalculateMasterButtons() requires dev->master to be still
|
||||
valid, so we can reset it only at the end of function.
|
||||
|
||||
Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
|
||||
---
|
||||
dix/devices.c | 1 +
|
||||
1 file changed, 1 insertion(+)
|
||||
|
||||
diff --git a/dix/devices.c b/dix/devices.c
|
||||
index e62c34c55..5f9ce1678 100644
|
||||
--- a/dix/devices.c
|
||||
+++ b/dix/devices.c
|
||||
@@ -520,6 +520,7 @@ DisableDevice(DeviceIntPtr dev, BOOL sendevent)
|
||||
}
|
||||
|
||||
RecalculateMasterButtons(dev);
|
||||
+ dev->master = NULL;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
--
|
||||
2.43.0
|
||||
|
||||
Loading…
Reference in new issue