Stefan Dirsch
f15e897874
U_CVE-2025-26594-0002-dix-keep-a-ref-to-the-rootCursor.patch * Use-after-free of the root cursor (CVE-2025-26594, bsc#1237427) - U_CVE-2025-26595-0001-xkb-Fix-buffer-overflow-in-XkbVModMaskText.patch * Buffer overflow in XkbVModMaskText() (CVE-2025-26595, bsc#1237429) - U_CVE-2025-26596-0001-xkb-Fix-computation-of-XkbSizeKeySyms.patch * Heap overflow in XkbWriteKeySyms() (CVE-2025-26596, bsc#1237430) - U_CVE-2025-26597-0001-xkb-Fix-buffer-overflow-in-XkbChangeTypesOfKey.patch * Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597, bsc#1237431) - U_CVE-2025-26598-0001-Xi-Fix-barrier-device-search.patch * Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598, bsc#1237432) - U_CVE-2025-26599-0001-composite-Handle-failure-to-redirect-in-compRedirect.patch U_CVE-2025-26599-0002-composite-initialize-border-clip-even-when-pixmap-al.patch * Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599, bsc#1237433) - U_CVE-2025-26600-0001-dix-Dequeue-pending-events-on-frozen-device-on-remov.patch * Use-after-free in PlayReleasedEvents() (CVE-2025-26600, bsc#1237434) - U_CVE-2025-26601-0001-sync-Do-not-let-sync-objects-uninitialized.patch U_CVE-2025-26601-0002-sync-Check-values-before-applying-changes.patch U_CVE-2025-26601-0003-sync-Do-not-fail-SyncAddTriggerToSyncObject.patch U_CVE-2025-26601-0004-sync-Apply-changes-last-in-SyncChangeAlarmAttributes.patch * Use-after-free in SyncInitTrigger() (CVE-2025-26601, bsc#1237435) OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/xorg-x11-server?expand=0&rev=907
64 lines
2.2 KiB
Diff
64 lines
2.2 KiB
Diff
From 573a2265aacfeaddcc1bb001905a6f7d4fa15ee6 Mon Sep 17 00:00:00 2001
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From: Olivier Fourdan <ofourdan@redhat.com>
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Date: Mon, 20 Jan 2025 16:52:01 +0100
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Subject: [PATCH xserver 1/4] sync: Do not let sync objects uninitialized
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When changing an alarm, the change mask values are evaluated one after
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the other, changing the trigger values as requested and eventually,
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SyncInitTrigger() is called.
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SyncInitTrigger() will evaluate the XSyncCACounter first and may free
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the existing sync object.
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Other changes are then evaluated and may trigger an error and an early
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return, not adding the new sync object.
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This can be used to cause a use after free when the alarm eventually
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triggers.
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To avoid the issue, delete the existing sync object as late as possible
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only once we are sure that no further error will cause an early exit.
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CVE-2025-26601, ZDI-CAN-25870
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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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Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
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Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
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---
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Xext/sync.c | 13 ++++++++-----
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1 file changed, 8 insertions(+), 5 deletions(-)
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Index: xwayland-22.1.5/Xext/sync.c
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===================================================================
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--- xwayland-22.1.5.orig/Xext/sync.c
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+++ xwayland-22.1.5/Xext/sync.c
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@@ -329,11 +329,6 @@ SyncInitTrigger(ClientPtr client, SyncTr
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client->errorValue = syncObject;
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return rc;
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}
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- if (pSync != pTrigger->pSync) { /* new counter for trigger */
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- SyncDeleteTriggerFromSyncObject(pTrigger);
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- pTrigger->pSync = pSync;
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- newSyncObject = TRUE;
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- }
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}
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/* if system counter, ask it what the current value is */
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@@ -401,6 +396,14 @@ SyncInitTrigger(ClientPtr client, SyncTr
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}
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}
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+ if (changes & XSyncCACounter) {
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+ if (pSync != pTrigger->pSync) { /* new counter for trigger */
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+ SyncDeleteTriggerFromSyncObject(pTrigger);
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+ pTrigger->pSync = pSync;
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+ newSyncObject = TRUE;
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+ }
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+ }
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+
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/* we wait until we're sure there are no errors before registering
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* a new counter on a trigger
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*/
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