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62 lines
2.1 KiB
62 lines
2.1 KiB
4 months ago
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From f4623ea611a74c684b0097b98a803cbe7ffb0825 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 09:26:55 -0400
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Subject: [PATCH 5/6] hw/char/virtio-serial-bus: Protect from DMA re-entrancy
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bugs
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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: [5/6] fc8a445ebf6e763cd1482cd1f7ee23e5b5bbb388 (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 b4295bff25f7b50de1d9cc94a9c6effd40056bca
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Thu Apr 4 20:56:35 2024 +0200
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hw/char/virtio-serial-bus: Protect from DMA re-entrancy bugs
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Replace qemu_bh_new_guarded() by virtio_bh_new_guarded()
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so the bus and device use the same guard. Otherwise the
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DMA-reentrancy protection can be bypassed.
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Fixes: CVE-2024-3446
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Cc: qemu-stable@nongnu.org
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Suggested-by: Alexander Bulekov <alxndr@bu.edu>
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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: <20240409105537.18308-4-philmd@linaro.org>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/char/virtio-serial-bus.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
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index f18124b155..791b7ac59e 100644
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--- a/hw/char/virtio-serial-bus.c
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+++ b/hw/char/virtio-serial-bus.c
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@@ -985,8 +985,7 @@ static void virtser_port_device_realize(DeviceState *dev, Error **errp)
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return;
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}
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- port->bh = qemu_bh_new_guarded(flush_queued_data_bh, port,
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- &dev->mem_reentrancy_guard);
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+ port->bh = virtio_bh_new_guarded(dev, flush_queued_data_bh, port);
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port->elem = NULL;
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}
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--
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2.39.3
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