[OE-core][kirkstone 05/31] qemu: backport patch for CVE-2021-4207

Steve Sakoman
2022-05-17T18:23:51Z

From: Davide Gardenal <davidegarde2000@gmail.com>

CVE: CVE-2021-4207

Upstream fix:
https://git.qemu.org/?p=qemu.git;a=commit;h=9569f5cb5b4bffa9d3ebc8ba7da1e03830a9a895

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
---
meta/recipes-devtools/qemu/qemu.inc | 1 +
.../qemu/qemu/CVE-2021-4207.patch | 43 +++++++++++++++++++
2 files changed, 44 insertions(+)
create mode 100644 meta/recipes-devtools/qemu/qemu/CVE-2021-4207.patch

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index b7762f83a8..cc69eca9ae 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -34,6 +34,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
file://0002-virtio-net-fix-map-leaking-on-error-during-receive.patch \
file://pvrdma.patch \
file://CVE-2021-4206.patch \
+ file://CVE-2021-4207.patch \
"
UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2021-4207.patch b/meta/recipes-devtools/qemu/qemu/CVE-2021-4207.patch
new file mode 100644
index 0000000000..38f36abd9e
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2021-4207.patch
@@ -0,0 +1,43 @@
+From 9569f5cb5b4bffa9d3ebc8ba7da1e03830a9a895 Mon Sep 17 00:00:00 2001
+From: Mauro Matteo Cascella <mcascell@redhat.com>
+Date: Thu, 7 Apr 2022 10:11:06 +0200
+Subject: [PATCH] display/qxl-render: fix race condition in qxl_cursor
+ (CVE-2021-4207)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf8
+Content-Transfer-Encoding: 8bit
+
+Avoid fetching 'width' and 'height' a second time to prevent possible
+race condition. Refer to security advisory
+https://starlabs.sg/advisories/22-4207/ for more information.
+
+Fixes: CVE-2021-4207
+Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Reviewed-by: Marc-AndrÃ© Lureau <marcandre.lureau@redhat.com>
+Message-Id: <20220407081106.343235-1-mcascell@redhat.com>
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+Upstream-Status: Backport
+https://git.qemu.org/?p=qemu.git;a=commit;h=9569f5cb5b4bffa9d3ebc8ba7da1e03830a9a895
+
+Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>
+---
+ hw/display/qxl-render.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
+index d28849b..237ed29 100644
+--- a/hw/display/qxl-render.c
++++ b/hw/display/qxl-render.c
+@@ -266,7 +266,7 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor,
+ }
+ break;
+ case SPICE_CURSOR_TYPE_ALPHA:
+- size = sizeof(uint32_t) * cursor->header.width * cursor->header.height;
++ size = sizeof(uint32_t) * c->width * c->height;
+ qxl_unpack_chunks(c->data, size, qxl, &cursor->chunk, group_id);
+ if (qxl->debug > 2) {
+ cursor_print_ascii_art(c, "qxl/alpha");
+--
+1.8.3.1
+
--
2.25.1