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87 lines
3.1 KiB
87 lines
3.1 KiB
4 months ago
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From 1b62d61c495bf4cd3a819ab8d1ef024d153e0ece Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Thu, 18 Jul 2024 09:40:29 -0400
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Subject: [PATCH 3/6] hw/virtio: Introduce virtio_bh_new_guarded() helper
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
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RH-Jira: RHEL-32276
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RH-Acked-by: Gerd Hoffmann <None>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [3/6] 1cbde7ddb8393b72e2e8d457b5e2d739116567a9 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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JIRA: https://issues.redhat.com/browse/RHEL-32276
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CVE: CVE-2024-3446
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Upstream: Merged
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commit ec0504b989ca61e03636384d3602b7bf07ffe4da
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Thu Apr 4 20:56:11 2024 +0200
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hw/virtio: Introduce virtio_bh_new_guarded() helper
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Introduce virtio_bh_new_guarded(), similar to qemu_bh_new_guarded()
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but using the transport memory guard, instead of the device one
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(there can only be one virtio device per virtio bus).
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Inspired-by: Gerd Hoffmann <kraxel@redhat.com>
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Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Message-Id: <20240409105537.18308-2-philmd@linaro.org>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/virtio/virtio.c | 10 ++++++++++
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include/hw/virtio/virtio.h | 7 +++++++
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2 files changed, 17 insertions(+)
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diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
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index ea7c079fb0..5ae9c44841 100644
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--- a/hw/virtio/virtio.c
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+++ b/hw/virtio/virtio.c
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@@ -3874,3 +3874,13 @@ static void virtio_register_types(void)
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}
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type_init(virtio_register_types)
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+
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+QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
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+ QEMUBHFunc *cb, void *opaque,
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+ const char *name)
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+{
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+ DeviceState *transport = qdev_get_parent_bus(dev)->parent;
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+
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+ return qemu_bh_new_full(cb, opaque, name,
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+ &transport->mem_reentrancy_guard);
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+}
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diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
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index 8bab9cfb75..731c631a81 100644
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--- a/include/hw/virtio/virtio.h
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+++ b/include/hw/virtio/virtio.h
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@@ -22,6 +22,7 @@
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#include "standard-headers/linux/virtio_config.h"
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#include "standard-headers/linux/virtio_ring.h"
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#include "qom/object.h"
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+#include "block/aio.h"
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/* A guest should never accept this. It implies negotiation is broken. */
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#define VIRTIO_F_BAD_FEATURE 30
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@@ -397,4 +398,10 @@ static inline bool virtio_device_disabled(VirtIODevice *vdev)
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bool virtio_legacy_allowed(VirtIODevice *vdev);
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bool virtio_legacy_check_disabled(VirtIODevice *vdev);
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+QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
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+ QEMUBHFunc *cb, void *opaque,
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+ const char *name);
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+#define virtio_bh_new_guarded(dev, cb, opaque) \
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+ virtio_bh_new_guarded_full((dev), (cb), (opaque), (stringify(cb)))
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+
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#endif
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--
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2.39.3
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