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File _service:tar_scm:virtio-net-correctly-copy-vnet-header-when-flushing-.patch of Package qemu
From 912641a75955a75f37ab8695a0753b1571762717 Mon Sep 17 00:00:00 2001 From: Jason Wang <jasowang@redhat.com> Date: Tue, 2 Jan 2024 11:29:01 +0800 Subject: [PATCH] virtio-net: correctly copy vnet header when flushing TX (CVE-2023-6693) 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> --- 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 80c56f0cfc..73024babd4 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -674,6 +674,11 @@ 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) : @@ -2693,7 +2698,7 @@ 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) { @@ -2710,7 +2715,7 @@ 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); @@ -2718,8 +2723,8 @@ 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, -- 2.27.0
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