forked from rpms/qemu-kvm
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
3.5 KiB
91 lines
3.5 KiB
7 months ago
|
From c3146dd39fb274ffbd70d20f8ba9e13562fb21ad Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jon Maloy <jmaloy@redhat.com>
|
||
|
|
Date: Tue, 5 Mar 2024 16:38:49 -0500
|
||
|
|
Subject: [PATCH 3/3] virtio-net: correctly copy vnet header when flushing TX
|
||
|
|
|
||
|
|
RH-Author: Jon Maloy <jmaloy@redhat.com>
|
||
|
|
RH-MergeRequest: 354: virtio-net: correctly copy vnet header when flushing TX
|
||
|
|
RH-Jira: RHEL-19496
|
||
|
|
RH-Acked-by: Jason Wang <jasowang@redhat.com>
|
||
|
|
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
||
|
|
RH-Commit: [1/1] 445b601da86a64298b776879fa0f30a4bf6c16f5 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
|
||
|
|
|
||
|
|
JIRA: https://issues.redhat.com/browse/RHEL-19496
|
||
|
|
CVE: CVE-2023-6693
|
||
|
|
Upstream: Merged
|
||
|
|
|
||
|
|
commit 2220e8189fb94068dbad333228659fbac819abb0
|
||
|
|
Author: Jason Wang <jasowang@redhat.com>
|
||
|
|
Date: Tue Jan 2 11:29:01 2024 +0800
|
||
|
|
|
||
|
|
virtio-net: correctly copy vnet header when flushing TX
|
||
|
|
|
||
|
|
When HASH_REPORT is negotiated, the guest_hdr_len might be larger than
|
||
|
|
the size of the mergeable rx buffer header. Using
|
||
|
|
virtio_net_hdr_mrg_rxbuf during the header swap might lead a stack
|
||
|
|
overflow in this case. Fixing this by using virtio_net_hdr_v1_hash
|
||
|
|
instead.
|
||
|
|
|
||
|
|
Reported-by: Xiao Lei <leixiao.nop@zju.edu.cn>
|
||
|
|
Cc: Yuri Benditovich <yuri.benditovich@daynix.com>
|
||
|
|
Cc: qemu-stable@nongnu.org
|
||
|
|
Cc: Mauro Matteo Cascella <mcascell@redhat.com>
|
||
|
|
Fixes: CVE-2023-6693
|
||
|
|
Fixes: e22f0603fb2f ("virtio-net: reference implementation of hash report")
|
||
|
|
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
|
||
|
|
Signed-off-by: Jason Wang <jasowang@redhat.com>
|
||
|
|
|
||
|
|
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
|
||
|
|
---
|
||
|
|
hw/net/virtio-net.c | 13 +++++++++----
|
||
|
|
1 file changed, 9 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
|
||
|
|
index f5f07f8e63..7d459726d4 100644
|
||
|
|
--- a/hw/net/virtio-net.c
|
||
|
|
+++ b/hw/net/virtio-net.c
|
||
|
|
@@ -602,6 +602,11 @@ static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
|
||
|
|
|
||
|
|
n->mergeable_rx_bufs = mergeable_rx_bufs;
|
||
|
|
|
||
|
|
+ /*
|
||
|
|
+ * Note: when extending the vnet header, please make sure to
|
||
|
|
+ * change the vnet header copying logic in virtio_net_flush_tx()
|
||
|
|
+ * as well.
|
||
|
|
+ */
|
||
|
|
if (version_1) {
|
||
|
|
n->guest_hdr_len = hash_report ?
|
||
|
|
sizeof(struct virtio_net_hdr_v1_hash) :
|
||
|
|
@@ -2535,7 +2540,7 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
||
|
|
ssize_t ret;
|
||
|
|
unsigned int out_num;
|
||
|
|
struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
|
||
|
|
- struct virtio_net_hdr_mrg_rxbuf mhdr;
|
||
|
|
+ struct virtio_net_hdr_v1_hash vhdr;
|
||
|
|
|
||
|
|
elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
|
||
|
|
if (!elem) {
|
||
|
|
@@ -2552,7 +2557,7 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
||
|
|
}
|
||
|
|
|
||
|
|
if (n->has_vnet_hdr) {
|
||
|
|
- if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
|
||
|
|
+ if (iov_to_buf(out_sg, out_num, 0, &vhdr, n->guest_hdr_len) <
|
||
|
|
n->guest_hdr_len) {
|
||
|
|
virtio_error(vdev, "virtio-net header incorrect");
|
||
|
|
virtqueue_detach_element(q->tx_vq, elem, 0);
|
||
|
|
@@ -2560,8 +2565,8 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
if (n->needs_vnet_hdr_swap) {
|
||
|
|
- virtio_net_hdr_swap(vdev, (void *) &mhdr);
|
||
|
|
- sg2[0].iov_base = &mhdr;
|
||
|
|
+ virtio_net_hdr_swap(vdev, (void *) &vhdr);
|
||
|
|
+ sg2[0].iov_base = &vhdr;
|
||
|
|
sg2[0].iov_len = n->guest_hdr_len;
|
||
|
|
out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
|
||
|
|
out_sg, out_num,
|
||
|
|
--
|
||
|
|
2.41.0
|
||
|
|
|