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File _service:tar_scm:virtio-check-descriptor-numbers.patch of Package qemu
From b57e956ea522b487081d1c94aa2e4af6a3314d20 Mon Sep 17 00:00:00 2001 From: Jinhua Cao <caojinhua1@huawei.com> Date: Thu, 10 Feb 2022 11:09:36 +0800 Subject: [PATCH] virtio: check descriptor numbers Check if the vring num is normal in virtio_save(), and add LOG the vm push the wrong viring num down through writing IO Port. Signed-off-by: Jinhua Cao <caojinhua1@huawei.com> --- hw/virtio/virtio.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index a9aa0c4f66..27ceab92be 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2797,6 +2797,22 @@ static const VMStateDescription vmstate_virtio = { } }; +static void check_vring_avail_num(VirtIODevice *vdev, int index) +{ + uint16_t nheads; + + /* Check it isn't doing strange things with descriptor numbers. */ + nheads = vring_avail_idx(&vdev->vq[index]) - vdev->vq[index].last_avail_idx; + if (nheads > vdev->vq[index].vring.num) { + qemu_log("VQ %d size 0x%x Guest index 0x%x " + "inconsistent with Host index 0x%x: " + "delta 0x%x\n", + index, vdev->vq[index].vring.num, + vring_avail_idx(&vdev->vq[index]), + vdev->vq[index].last_avail_idx, nheads); + } +} + int virtio_save(VirtIODevice *vdev, QEMUFile *f) { BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); @@ -2827,6 +2843,8 @@ int virtio_save(VirtIODevice *vdev, QEMUFile *f) if (vdev->vq[i].vring.num == 0) break; + check_vring_avail_num(vdev, i); + qemu_put_be32(f, vdev->vq[i].vring.num); if (k->has_variable_vring_alignment) { qemu_put_be32(f, vdev->vq[i].vring.align); -- 2.27.0
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