qemu: patch CVE-2024-6505

Backport patch [3] as linked from [1] via [2].

[1] https://nvd.nist.gov/vuln/detail/CVE-2024-6505
[2] https://bugzilla.redhat.com/show_bug.cgi?id=2295760
[3] https://gitlab.com/qemu-project/qemu/-/commit/f1595ceb

(From OE-Core rev: ded62bdb5ce9da62aaaa53ac20203bd87a7b1197)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-devtools/qemu/qemu.inc

@@ -35,6 +35,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://0011-qemu-Ensure-pip-and-the-python-venv-aren-t-used-for-.patch \
            file://qemu-guest-agent.init \
            file://qemu-guest-agent.udev \
+           file://CVE-2024-6505.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 

meta/recipes-devtools/qemu/qemu/CVE-2024-6505.patch

@@ -0,0 +1,40 @@
+From f1595ceb9aad36a6c1da95bcb77ab9509b38822d Mon Sep 17 00:00:00 2001
+From: Akihiko Odaki <akihiko.odaki@daynix.com>
+Date: Mon, 1 Jul 2024 20:58:04 +0900
+Subject: [PATCH] virtio-net: Ensure queue index fits with RSS
+
+Ensure the queue index points to a valid queue when software RSS
+enabled. The new calculation matches with the behavior of Linux's TAP
+device with the RSS eBPF program.
+
+Fixes: 4474e37a5b3a ("virtio-net: implement RX RSS processing")
+Reported-by: Zhibin Hu <huzhibin5@huawei.com>
+Cc: qemu-stable@nongnu.org
+Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
+Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
+Signed-off-by: Jason Wang <jasowang@redhat.com>
+
+CVE: CVE-2024-6505
+Upstream-Status: Backport [https://gitlab.com/qemu-project/qemu/-/commit/f1595ceb9aad36a6c1da95bcb77ab9509b38822d]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ hw/net/virtio-net.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
+index 8f30972708..5635620a31 100644
+--- a/hw/net/virtio-net.c
++++ b/hw/net/virtio-net.c
+@@ -1949,7 +1949,8 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
+     if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
+         int index = virtio_net_process_rss(nc, buf, size);
+         if (index >= 0) {
+-            NetClientState *nc2 = qemu_get_subqueue(n->nic, index);
++            NetClientState *nc2 =
++                qemu_get_subqueue(n->nic, index % n->curr_queue_pairs);
+             return virtio_net_receive_rcu(nc2, buf, size, true);
+         }
+     }
+-- 
+2.30.2
+