xwayland: Fix CVE-2025-26599

Upstream-Status: Backport from
https://gitlab.freedesktop.org/xorg/xserver/-/commit/c1ff84be & https://gitlab.freedesktop.org/xorg/xserver/-/commit/b07192a8

(From OE-Core rev: aea55eb6eb5610ef6e7d37fadcbb7e760bf80d7d)

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

3 files changed, 197 insertions, 0 deletions

diff --git a/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26599-1.patch b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26599-1.patch
new file mode 100644
index 0000000000..60b68a0d9a
--- /dev/null
+++ b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26599-1.patch
@@ -0,0 +1,66 @@
+From c1ff84bef2569b4ba4be59323cf575d1798ba9be Mon Sep 17 00:00:00 2001
+From: Olivier Fourdan <ofourdan@redhat.com>
+Date: Tue, 17 Dec 2024 15:19:45 +0100
+Subject: [PATCH] composite: Handle failure to redirect in compRedirectWindow()
+
+The function compCheckRedirect() may fail if it cannot allocate the
+backing pixmap.
+
+In that case, compRedirectWindow() will return a BadAlloc error.
+
+However that failure code path will shortcut the validation of the
+window tree marked just before, which leaves the validate data partly
+initialized.
+
+That causes a use of uninitialized pointer later.
+
+The fix is to not shortcut the call to compHandleMarkedWindows() even in
+the case of compCheckRedirect() returning an error.
+
+CVE-2025-26599, ZDI-CAN-25851
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
+Acked-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/c1ff84be]
+CVE: CVE-2025-26599
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ composite/compalloc.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/composite/compalloc.c b/composite/compalloc.c
+index eaabf0d..0bbbc55 100644
+--- a/composite/compalloc.c
++++ b/composite/compalloc.c
+@@ -140,6 +140,7 @@ compRedirectWindow(ClientPtr pClient, WindowPtr pWin, int update)
+     CompScreenPtr cs = GetCompScreen(pWin->drawable.pScreen);
+     WindowPtr pLayerWin;
+     Bool anyMarked = FALSE;
++    int status = Success;
+ 
+     if (pWin == cs->pOverlayWin) {
+         return Success;
+@@ -218,13 +219,13 @@ compRedirectWindow(ClientPtr pClient, WindowPtr pWin, int update)
+ 
+     if (!compCheckRedirect(pWin)) {
+         FreeResource(ccw->id, RT_NONE);
+-        return BadAlloc;
++        status = BadAlloc;
+     }
+ 
+     if (anyMarked)
+         compHandleMarkedWindows(pWin, pLayerWin);
+ 
+-    return Success;
++    return status;
+ }
+ 
+ void
+-- 
+2.25.1
+
diff --git a/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26599-2.patch b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26599-2.patch
new file mode 100644
index 0000000000..252b033261
--- /dev/null
+++ b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26599-2.patch
@@ -0,0 +1,129 @@
+From b07192a8bedb90b039dc0f70ae69daf047ff9598 Mon Sep 17 00:00:00 2001
+From: Olivier Fourdan <ofourdan@redhat.com>
+Date: Mon, 13 Jan 2025 16:09:43 +0100
+Subject: [PATCH] composite: initialize border clip even when pixmap alloc
+ fails
+
+If it fails to allocate the pixmap, the function compAllocPixmap() would
+return early and leave the borderClip region uninitialized, which may
+lead to the use of uninitialized value as reported by valgrind:
+
+ Conditional jump or move depends on uninitialised value(s)
+    at 0x4F9B33: compClipNotify (compwindow.c:317)
+    by 0x484FC9: miComputeClips (mivaltree.c:476)
+    by 0x48559A: miValidateTree (mivaltree.c:679)
+    by 0x4F0685: MapWindow (window.c:2693)
+    by 0x4A344A: ProcMapWindow (dispatch.c:922)
+    by 0x4A25B5: Dispatch (dispatch.c:560)
+    by 0x4B082A: dix_main (main.c:282)
+    by 0x429233: main (stubmain.c:34)
+  Uninitialised value was created by a heap allocation
+    at 0x4841866: malloc (vg_replace_malloc.c:446)
+    by 0x4F47BC: compRedirectWindow (compalloc.c:171)
+    by 0x4FA8AD: compCreateWindow (compwindow.c:592)
+    by 0x4EBB89: CreateWindow (window.c:925)
+    by 0x4A2E6E: ProcCreateWindow (dispatch.c:768)
+    by 0x4A25B5: Dispatch (dispatch.c:560)
+    by 0x4B082A: dix_main (main.c:282)
+    by 0x429233: main (stubmain.c:34)
+
+ Conditional jump or move depends on uninitialised value(s)
+    at 0x48EEDBC: pixman_region_translate (pixman-region.c:2233)
+    by 0x4F9255: RegionTranslate (regionstr.h:312)
+    by 0x4F9B7E: compClipNotify (compwindow.c:319)
+    by 0x484FC9: miComputeClips (mivaltree.c:476)
+    by 0x48559A: miValidateTree (mivaltree.c:679)
+    by 0x4F0685: MapWindow (window.c:2693)
+    by 0x4A344A: ProcMapWindow (dispatch.c:922)
+    by 0x4A25B5: Dispatch (dispatch.c:560)
+    by 0x4B082A: dix_main (main.c:282)
+    by 0x429233: main (stubmain.c:34)
+  Uninitialised value was created by a heap allocation
+    at 0x4841866: malloc (vg_replace_malloc.c:446)
+    by 0x4F47BC: compRedirectWindow (compalloc.c:171)
+    by 0x4FA8AD: compCreateWindow (compwindow.c:592)
+    by 0x4EBB89: CreateWindow (window.c:925)
+    by 0x4A2E6E: ProcCreateWindow (dispatch.c:768)
+    by 0x4A25B5: Dispatch (dispatch.c:560)
+    by 0x4B082A: dix_main (main.c:282)
+    by 0x429233: main (stubmain.c:34)
+
+ Conditional jump or move depends on uninitialised value(s)
+    at 0x48EEE33: UnknownInlinedFun (pixman-region.c:2241)
+    by 0x48EEE33: pixman_region_translate (pixman-region.c:2225)
+    by 0x4F9255: RegionTranslate (regionstr.h:312)
+    by 0x4F9B7E: compClipNotify (compwindow.c:319)
+    by 0x484FC9: miComputeClips (mivaltree.c:476)
+    by 0x48559A: miValidateTree (mivaltree.c:679)
+    by 0x4F0685: MapWindow (window.c:2693)
+    by 0x4A344A: ProcMapWindow (dispatch.c:922)
+    by 0x4A25B5: Dispatch (dispatch.c:560)
+    by 0x4B082A: dix_main (main.c:282)
+    by 0x429233: main (stubmain.c:34)
+  Uninitialised value was created by a heap allocation
+    at 0x4841866: malloc (vg_replace_malloc.c:446)
+    by 0x4F47BC: compRedirectWindow (compalloc.c:171)
+    by 0x4FA8AD: compCreateWindow (compwindow.c:592)
+    by 0x4EBB89: CreateWindow (window.c:925)
+    by 0x4A2E6E: ProcCreateWindow (dispatch.c:768)
+    by 0x4A25B5: Dispatch (dispatch.c:560)
+    by 0x4B082A: dix_main (main.c:282)
+    by 0x429233: main (stubmain.c:34)
+
+Fix compAllocPixmap() to initialize the border clip even if the creation
+of the backing pixmap has failed, to avoid depending later on
+uninitialized border clip values.
+
+Related to CVE-2025-26599, ZDI-CAN-25851
+
+Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
+Acked-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/b07192a8]
+CVE: CVE-2025-26599
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ composite/compalloc.c | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/composite/compalloc.c b/composite/compalloc.c
+index 7cf7351e00..4a1243170d 100644
+--- a/composite/compalloc.c
++++ b/composite/compalloc.c
+@@ -605,9 +605,12 @@ compAllocPixmap(WindowPtr pWin)
+     int h = pWin->drawable.height + (bw << 1);
+     PixmapPtr pPixmap = compNewPixmap(pWin, x, y, w, h);
+     CompWindowPtr cw = GetCompWindow(pWin);
++    Bool status;
+ 
+-    if (!pPixmap)
+-        return FALSE;
++    if (!pPixmap) {
++        status = FALSE;
++        goto out;
++    }
+     if (cw->update == CompositeRedirectAutomatic)
+         pWin->redirectDraw = RedirectDrawAutomatic;
+     else
+@@ -621,14 +624,16 @@ compAllocPixmap(WindowPtr pWin)
+         DamageRegister(&pWin->drawable, cw->damage);
+         cw->damageRegistered = TRUE;
+     }
++    status = TRUE;
+ 
++out:
+     /* Make sure our borderClip is up to date */
+     RegionUninit(&cw->borderClip);
+     RegionCopy(&cw->borderClip, &pWin->borderClip);
+     cw->borderClipX = pWin->drawable.x;
+     cw->borderClipY = pWin->drawable.y;
+ 
+-    return TRUE;
++    return status;
+ }
+ 
+ void
+-- 
+GitLab
+
diff --git a/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb b/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
index b46a02e5c3..cafddc62b5 100644
--- a/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
+++ b/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
@@ -17,6 +17,8 @@ SRC_URI = "https://www.x.org/archive/individual/xserver/xwayland-${PV}.tar.xz \
            file://CVE-2025-26596.patch \
            file://CVE-2025-26597.patch \
            file://CVE-2025-26598.patch \
+           file://CVE-2025-26599-1.patch \
+           file://CVE-2025-26599-2.patch \
 "
 SRC_URI[sha256sum] = "33ec7ff2687a59faaa52b9b09aa8caf118e7ecb6aed8953f526a625ff9f4bd90"