From: Philippe Mathieu-Daudé <philmd@linaro.org>
Date: Thu, 4 Apr 2024 18:56:41 +0000 (+0200)
Subject: hw/virtio/virtio-crypto: Protect from DMA re-entrancy bugs
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f4729ec39ad97a42ceaa7b5697f84f440ea6e5dc;p=qemu.git

hw/virtio/virtio-crypto: Protect from DMA re-entrancy bugs

Replace qemu_bh_new_guarded() by virtio_bh_new_guarded()
so the bus and device use the same guard. Otherwise the
DMA-reentrancy protection can be bypassed.

Fixes: CVE-2024-3446
Cc: qemu-stable@nongnu.org
Suggested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20240409105537.18308-5-philmd@linaro.org>
---

diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index fe1313f2ad..bbe8aa4b99 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -1080,8 +1080,8 @@ static void virtio_crypto_device_realize(DeviceState *dev, Error **errp)
         vcrypto->vqs[i].dataq =
                  virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq_bh);
         vcrypto->vqs[i].dataq_bh =
-                 qemu_bh_new_guarded(virtio_crypto_dataq_bh, &vcrypto->vqs[i],
-                                     &dev->mem_reentrancy_guard);
+                 virtio_bh_new_guarded(dev, virtio_crypto_dataq_bh,
+                                       &vcrypto->vqs[i]);
         vcrypto->vqs[i].vcrypto = vcrypto;
     }