xwayland: fix CVE-2025-49180

A flaw was found in the RandR extension, where the RRChangeProviderProperty function
does not properly validate input. This issue leads to an integer overflow when
computing the total size to allocate.

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/meta/recipes-graphics/xwayland/xwayland/CVE-2025-49180.patch b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-49180.patch
new file mode 100644 (file)
index 0000000..51939ac
--- /dev/null
+++ b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-49180.patch
@@ -0,0 +1,45 @@
+From 3c3a4b767b16174d3213055947ea7f4f88e10ec6 Mon Sep 17 00:00:00 2001
+From: Olivier Fourdan <ofourdan@redhat.com>
+Date: Tue, 20 May 2025 15:18:19 +0200
+Subject: [PATCH] randr: Check for overflow in RRChangeProviderProperty()
+
+A client might send a request causing an integer overflow when computing
+the total size to allocate in RRChangeProviderProperty().
+
+To avoid the issue, check that total length in bytes won't exceed the
+maximum integer value.
+
+CVE-2025-49180
+
+This issue was discovered by Nils Emmerich <nemmerich@ernw.de> and
+reported by Julian Suleder via ERNW Vulnerability Disclosure.
+
+Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
+Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
+Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2024>
+
+CVE: CVE-2025-49180
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/3c3a4b767b16174d3213055947ea7f4f88e10ec6]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ randr/rrproviderproperty.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/randr/rrproviderproperty.c b/randr/rrproviderproperty.c
+index 90c5a9a..0aa35ad 100644
+--- a/randr/rrproviderproperty.c
++++ b/randr/rrproviderproperty.c
+@@ -179,7 +179,8 @@ RRChangeProviderProperty(RRProviderPtr provider, Atom property, Atom type,
+
+     if (mode == PropModeReplace || len > 0) {
+         void *new_data = NULL, *old_data = NULL;
+-
++        if (total_len > MAXINT / size_in_bytes)
++            return BadValue;
+         total_size = total_len * size_in_bytes;
+         new_value.data = (void *) malloc(total_size);
+         if (!new_value.data && total_size) {
+--
+2.40.0

diff --git a/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb b/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
index 490e1ca05f95afaaae9c371e775683b23751dcc0..49e35ca442f2d059e65b40d73610b347cf09c345 100644 (file)
--- a/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
+++ b/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
@@ -30,6 +30,7 @@ SRC_URI = "https://www.x.org/archive/individual/xserver/xwayland-${PV}.tar.xz \
            file://CVE-2025-49177.patch \
            file://CVE-2025-49178.patch \
            file://CVE-2025-49179.patch \
+           file://CVE-2025-49180.patch \
 "
 SRC_URI[sha256sum] = "33ec7ff2687a59faaa52b9b09aa8caf118e7ecb6aed8953f526a625ff9f4bd90"