112 lines
4.9 KiB
Diff
112 lines
4.9 KiB
Diff
From qemu-stable-bounces+jmforbes=linuxtx.org@nongnu.org Wed Jan 11 03:51:20 2012
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From: Paolo Bonzini <pbonzini@redhat.com>
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To: qemu-stable@nongnu.org
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Date: Wed, 11 Jan 2012 10:48:33 +0100
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Subject: [Qemu-stable] [PATCH] virtio-blk: refuse SG_IO requests with
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scsi=off
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Status: RO
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Content-Length: 1003
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Lines: 38
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QEMU does have a "scsi" option (to be used like -device
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virtio-blk-pci,drive=foo,scsi=off). However, it only
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masks the feature bit, and does not reject the command
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if a malicious guest disregards the feature bits and
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issues a request.
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Without this patch, using scsi=off does not protect you
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from CVE-2011-4127.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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---
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hw/virtio-blk.c | 6 ++++++
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1 files changed, 6 insertions(+), 0 deletions(-)
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diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
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index b70d116..6cd3164 100644
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--- a/hw/virtio-blk.c
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+++ b/hw/virtio-blk.c
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@@ -153,6 +153,12 @@ static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
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int status;
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int i;
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+ if ((req->dev->vdev.guest_features & (1 << VIRTIO_BLK_F_SCSI)) == 0) {
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+ virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
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+ g_free(req);
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+ return;
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+ }
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+
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/*
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* We require at least one output segment each for the virtio_blk_outhdr
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* and the SCSI command block.
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--
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1.7.7.1
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