xwayland: Fix CVE-2025-26594

The patches are copied from xserver-xorg recipe.
CVE reported for both and patches apply on both.

Upstream-Commit: https://gitlab.freedesktop.org/xorg/xserver/-/commit/01642f26 & https://gitlab.freedesktop.org/xorg/xserver/-/commit/b0a09ba6

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26594-1.patch b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26594-1.patch
new file mode 100644 (file)
index 0000000..f34a89e
--- /dev/null
+++ b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26594-1.patch
@@ -0,0 +1,54 @@
+From 01642f263f12becf803b19be4db95a4a83f94acc Mon Sep 17 00:00:00 2001
+From: Olivier Fourdan <ofourdan@redhat.com>
+Date: Wed, 27 Nov 2024 11:27:05 +0100
+Subject: [PATCH] Cursor: Refuse to free the root cursor
+
+If a cursor reference count drops to 0, the cursor is freed.
+
+The root cursor however is referenced with a specific global variable,
+and when the root cursor is freed, the global variable may still point
+to freed memory.
+
+Make sure to prevent the rootCursor from being explicitly freed by a
+client.
+
+CVE-2025-26594, ZDI-CAN-25544
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+v2: Explicitly forbid XFreeCursor() on the root cursor (Peter Hutterer
+<peter.hutterer@who-t.net>)
+v3: Return BadCursor instead of BadValue (Michel Danzer
+<michel@daenzer.net>)
+
+Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
+Suggested-by: Peter Hutterer <peter.hutterer@who-t.net>
+Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
+Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1828>
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/01642f26]
+CVE: CVE-2025-26594
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ dix/dispatch.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/dix/dispatch.c b/dix/dispatch.c
+index 4602961..30b95c1 100644
+--- a/dix/dispatch.c
++++ b/dix/dispatch.c
+@@ -3107,6 +3107,10 @@ ProcFreeCursor(ClientPtr client)
+     rc = dixLookupResourceByType((void **) &pCursor, stuff->id, RT_CURSOR,
+                                  client, DixDestroyAccess);
+     if (rc == Success) {
++        if (pCursor == rootCursor) {
++          client->errorValue = stuff->id;
++          return BadCursor;
++      }
+         FreeResource(stuff->id, RT_NONE);
+         return Success;
+     }
+-- 
+2.25.1
+

diff --git a/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26594-2.patch b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26594-2.patch
new file mode 100644 (file)
index 0000000..6ebf540
--- /dev/null
+++ b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26594-2.patch
@@ -0,0 +1,51 @@
+From b0a09ba6020147961acc62d9c73d807b4cccd9f7 Mon Sep 17 00:00:00 2001
+From: Peter Hutterer <peter.hutterer@who-t.net>
+Date: Wed, 4 Dec 2024 15:49:43 +1000
+Subject: [PATCH] dix: keep a ref to the rootCursor
+
+CreateCursor returns a cursor with refcount 1 - that refcount is used by
+the resource system, any caller needs to call RefCursor to get their own
+reference. That happens correctly for normal cursors but for our
+rootCursor we keep a variable to the cursor despite not having a ref for
+ourselves.
+
+Fix this by reffing/unreffing the rootCursor to ensure our pointer is
+valid.
+
+Related to CVE-2025-26594, ZDI-CAN-25544
+
+Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
+Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1828>
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/b0a09ba6]
+CVE: CVE-2025-26594
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ dix/main.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/dix/main.c b/dix/main.c
+index bfc8add..38e29ce 100644
+--- a/dix/main.c
++++ b/dix/main.c
+@@ -231,6 +231,8 @@ dix_main(int argc, char *argv[], char *envp[])
+             FatalError("could not open default cursor font");
+         }
+ 
++        rootCursor = RefCursor(rootCursor);
++
+ #ifdef PANORAMIX
+         /*
+          * Consolidate window and colourmap information for each screen
+@@ -271,6 +273,8 @@ dix_main(int argc, char *argv[], char *envp[])
+ 
+         Dispatch();
+ 
++        UnrefCursor(rootCursor);
++
+         UndisplayDevices();
+         DisableAllDevices();
+ 
+-- 
+2.25.1
+

diff --git a/meta/recipes-graphics/xwayland/xwayland_22.1.8.bb b/meta/recipes-graphics/xwayland/xwayland_22.1.8.bb
index 23575b387e7d6856a6ec4709e61c8dec84980367..814fc1ce40120e5f79c97081fa1173251c3c8dc3 100644 (file)
--- a/meta/recipes-graphics/xwayland/xwayland_22.1.8.bb
+++ b/meta/recipes-graphics/xwayland/xwayland_22.1.8.bb
@@ -29,6 +29,8 @@ SRC_URI = "https://www.x.org/archive/individual/xserver/xwayland-${PV}.tar.xz \
            file://CVE-2024-31083-0001.patch \
            file://CVE-2024-31083-0002.patch \
            file://CVE-2024-9632.patch \
+           file://CVE-2025-26594-1.patch \
+           file://CVE-2025-26594-2.patch \
 "
 SRC_URI[sha256sum] = "d11eeee73290b88ea8da42a7d9350dedfaba856ce4ae44e58c045ad9ecaa2f73"