ac18fd1e56
- Fix CVE-2025-26595 xorg-x11-server Buffer overflow in XkbVModMaskText() - Fix CVE-2025-26596 xorg-x11-server Heap overflow in XkbWriteKeySyms() - Fix CVE-2025-26597 xorg-x11-server Buffer overflow in XkbChangeTypesOfKey() - Fix CVE-2025-26598 xorg-x11-server Out-of-bounds write in CreatePointerBarrierClient() - Fix CVE-2025-26599 xorg-x11-server Use of uninitialized pointer in compRedirectWindow() - Fix CVE-2025-26600 xorg-x11-server Use-after-free in PlayReleasedEvents() - Fix CVE-2025-26601 xorg-x11-server Use-after-free in SyncInitTrigger()
67 lines
2.2 KiB
Diff
67 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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diff --git a/Xext/sync.c b/Xext/sync.c
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index b6417b3b0..4267d3af6 100644
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--- a/Xext/sync.c
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+++ b/Xext/sync.c
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@@ -330,11 +330,6 @@ SyncInitTrigger(ClientPtr client, SyncTrigger * pTrigger, XID syncObject,
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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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@@ -402,6 +397,14 @@ SyncInitTrigger(ClientPtr client, SyncTrigger * pTrigger, XID syncObject,
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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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--
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2.48.1
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