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-rw-r--r--meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-0229-2.patch221
1 files changed, 221 insertions, 0 deletions
diff --git a/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-0229-2.patch b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-0229-2.patch
new file mode 100644
index 0000000000..65df74376b
--- /dev/null
+++ b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-0229-2.patch
@@ -0,0 +1,221 @@
+From 219c54b8a3337456ce5270ded6a67bcde53553d5 Mon Sep 17 00:00:00 2001
+From: Peter Hutterer <peter.hutterer@who-t.net>
+Date: Mon, 18 Dec 2023 12:26:20 +1000
+Subject: [PATCH] dix: fix DeviceStateNotify event calculation
+
+The previous code only made sense if one considers buttons and keys to
+be mutually exclusive on a device. That is not necessarily true, causing
+a number of issues.
+
+This function allocates and fills in the number of xEvents we need to
+send the device state down the wire. This is split across multiple
+32-byte devices including one deviceStateNotify event and optional
+deviceKeyStateNotify, deviceButtonStateNotify and (possibly multiple)
+deviceValuator events.
+
+The previous behavior would instead compose a sequence
+of [state, buttonstate, state, keystate, valuator...]. This is not
+protocol correct, and on top of that made the code extremely convoluted.
+
+Fix this by streamlining: add both button and key into the deviceStateNotify
+and then append the key state and button state, followed by the
+valuators. Finally, the deviceValuator events contain up to 6 valuators
+per event but we only ever sent through 3 at a time. Let's double that
+troughput.
+
+CVE-2024-0229, ZDI-CAN-22678
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/219c54b8a3337456ce5270ded6a67bcde53553d5]
+CVE: CVE-2024-0229
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ dix/enterleave.c | 121 ++++++++++++++++++++---------------------------
+ 1 file changed, 52 insertions(+), 69 deletions(-)
+
+diff --git a/dix/enterleave.c b/dix/enterleave.c
+index 17964b00a4..7b7ba1098b 100644
+--- a/dix/enterleave.c
++++ b/dix/enterleave.c
+@@ -615,9 +615,15 @@ FixDeviceValuator(DeviceIntPtr dev, deviceValuator * ev, ValuatorClassPtr v,
+
+ ev->type = DeviceValuator;
+ ev->deviceid = dev->id;
+- ev->num_valuators = nval < 3 ? nval : 3;
++ ev->num_valuators = nval < 6 ? nval : 6;
+ ev->first_valuator = first;
+ switch (ev->num_valuators) {
++ case 6:
++ ev->valuator2 = v->axisVal[first + 5];
++ case 5:
++ ev->valuator2 = v->axisVal[first + 4];
++ case 4:
++ ev->valuator2 = v->axisVal[first + 3];
+ case 3:
+ ev->valuator2 = v->axisVal[first + 2];
+ case 2:
+@@ -626,7 +632,6 @@ FixDeviceValuator(DeviceIntPtr dev, deviceValuator * ev, ValuatorClassPtr v,
+ ev->valuator0 = v->axisVal[first];
+ break;
+ }
+- first += ev->num_valuators;
+ }
+
+ static void
+@@ -646,7 +651,7 @@ FixDeviceStateNotify(DeviceIntPtr dev, deviceStateNotify * ev, KeyClassPtr k,
+ ev->num_buttons = b->numButtons;
+ memcpy((char *) ev->buttons, (char *) b->down, 4);
+ }
+- else if (k) {
++ if (k) {
+ ev->classes_reported |= (1 << KeyClass);
+ ev->num_keys = k->xkbInfo->desc->max_key_code -
+ k->xkbInfo->desc->min_key_code;
+@@ -670,15 +675,26 @@ FixDeviceStateNotify(DeviceIntPtr dev, deviceStateNotify * ev, KeyClassPtr k,
+ }
+ }
+
+-
++/**
++ * The device state notify event is split across multiple 32-byte events.
++ * The first one contains the first 32 button state bits, the first 32
++ * key state bits, and the first 3 valuator values.
++ *
++ * If a device has more than that, the server sends out:
++ * - one deviceButtonStateNotify for buttons 32 and above
++ * - one deviceKeyStateNotify for keys 32 and above
++ * - one deviceValuator event per 6 valuators above valuator 4
++ *
++ * All events but the last one have the deviceid binary ORed with MORE_EVENTS,
++ */
+ static void
+ DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
+ {
++ /* deviceStateNotify, deviceKeyStateNotify, deviceButtonStateNotify
++ * and one deviceValuator for each 6 valuators */
++ deviceStateNotify sev[3 + (MAX_VALUATORS + 6)/6];
+ int evcount = 1;
+- deviceStateNotify sev[6 + (MAX_VALUATORS + 2)/3];
+- deviceStateNotify *ev;
+- deviceKeyStateNotify *kev;
+- deviceButtonStateNotify *bev;
++ deviceStateNotify *ev = sev;
+
+ KeyClassPtr k;
+ ButtonClassPtr b;
+@@ -691,82 +707,49 @@ DeliverStateNotifyEvent(DeviceIntPtr dev, WindowPtr win)
+
+ if ((b = dev->button) != NULL) {
+ nbuttons = b->numButtons;
+- if (nbuttons > 32)
++ if (nbuttons > 32) /* first 32 are encoded in deviceStateNotify */
+ evcount++;
+ }
+ if ((k = dev->key) != NULL) {
+ nkeys = k->xkbInfo->desc->max_key_code - k->xkbInfo->desc->min_key_code;
+- if (nkeys > 32)
++ if (nkeys > 32) /* first 32 are encoded in deviceStateNotify */
+ evcount++;
+- if (nbuttons > 0) {
+- evcount++;
+- }
+ }
+ if ((v = dev->valuator) != NULL) {
+ nval = v->numAxes;
+-
+- if (nval > 3)
+- evcount++;
+- if (nval > 6) {
+- if (!(k && b))
+- evcount++;
+- if (nval > 9)
+- evcount += ((nval - 7) / 3);
+- }
++ /* first three are encoded in deviceStateNotify, then
++ * it's 6 per deviceValuator event */
++ evcount += ((nval - 3) + 6)/6;
+ }
+
+- ev = sev;
+- FixDeviceStateNotify(dev, ev, NULL, NULL, NULL, first);
+-
+- if (b != NULL) {
+- FixDeviceStateNotify(dev, ev++, NULL, b, v, first);
+- first += 3;
+- nval -= 3;
+- if (nbuttons > 32) {
+- (ev - 1)->deviceid |= MORE_EVENTS;
+- bev = (deviceButtonStateNotify *) ev++;
+- bev->type = DeviceButtonStateNotify;
+- bev->deviceid = dev->id;
+- memcpy((char *) &bev->buttons[4], (char *) &b->down[4],
+- DOWN_LENGTH - 4);
+- }
+- if (nval > 0) {
+- (ev - 1)->deviceid |= MORE_EVENTS;
+- FixDeviceValuator(dev, (deviceValuator *) ev++, v, first);
+- first += 3;
+- nval -= 3;
+- }
++ BUG_RETURN(evcount <= ARRAY_SIZE(sev));
++
++ FixDeviceStateNotify(dev, ev, k, b, v, first);
++
++ if (b != NULL && nbuttons > 32) {
++ deviceButtonStateNotify *bev = (deviceButtonStateNotify *) ++ev;
++ (ev - 1)->deviceid |= MORE_EVENTS;
++ bev->type = DeviceButtonStateNotify;
++ bev->deviceid = dev->id;
++ memcpy((char *) &bev->buttons[4], (char *) &b->down[4],
++ DOWN_LENGTH - 4);
+ }
+
+- if (k != NULL) {
+- FixDeviceStateNotify(dev, ev++, k, NULL, v, first);
+- first += 3;
+- nval -= 3;
+- if (nkeys > 32) {
+- (ev - 1)->deviceid |= MORE_EVENTS;
+- kev = (deviceKeyStateNotify *) ev++;
+- kev->type = DeviceKeyStateNotify;
+- kev->deviceid = dev->id;
+- memmove((char *) &kev->keys[0], (char *) &k->down[4], 28);
+- }
+- if (nval > 0) {
+- (ev - 1)->deviceid |= MORE_EVENTS;
+- FixDeviceValuator(dev, (deviceValuator *) ev++, v, first);
+- first += 3;
+- nval -= 3;
+- }
++ if (k != NULL && nkeys > 32) {
++ deviceKeyStateNotify *kev = (deviceKeyStateNotify *) ++ev;
++ (ev - 1)->deviceid |= MORE_EVENTS;
++ kev->type = DeviceKeyStateNotify;
++ kev->deviceid = dev->id;
++ memmove((char *) &kev->keys[0], (char *) &k->down[4], 28);
+ }
+
++ first = 3;
++ nval -= 3;
+ while (nval > 0) {
+- FixDeviceStateNotify(dev, ev++, NULL, NULL, v, first);
+- first += 3;
+- nval -= 3;
+- if (nval > 0) {
+- (ev - 1)->deviceid |= MORE_EVENTS;
+- FixDeviceValuator(dev, (deviceValuator *) ev++, v, first);
+- first += 3;
+- nval -= 3;
+- }
++ ev->deviceid |= MORE_EVENTS;
++ FixDeviceValuator(dev, (deviceValuator *) ++ev, v, first);
++ first += 6;
++ nval -= 6;
+ }
+
+ DeliverEventsToWindow(dev, win, (xEvent *) sev, evcount,
+--
+GitLab
+
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-04 14:36:39 +0000