40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From 1c22e4a35e71d98a082ad2f8f7bc778a8859e18d 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 4/9] Xi: when creating a new ButtonClass, set the
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number 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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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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(cherry picked from commit df3c65706eb169d5938df0052059f3e0d5981b74)
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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 54ea11a93..e16171468 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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