|
|
958e1b |
From 953a3b8344e504a7333ba9bb6df840d6d94ff872 Mon Sep 17 00:00:00 2001
|
|
|
eb5a2f |
From: Michael S. Tsirkin <mst@redhat.com>
|
|
|
958e1b |
Date: Wed, 14 May 2014 08:31:47 +0200
|
|
|
958e1b |
Subject: [PATCH 10/31] virtio-net: out-of-bounds buffer write on invalid state load
|
|
|
eb5a2f |
|
|
|
eb5a2f |
RH-Author: Michael S. Tsirkin <mst@redhat.com>
|
|
|
958e1b |
Message-id: <1400056285-6688-3-git-send-email-mst@redhat.com>
|
|
|
958e1b |
Patchwork-id: 58857
|
|
|
958e1b |
O-Subject: [PATCH qemu-kvm RHEL7.1] virtio-net: out-of-bounds buffer write on invalid state load
|
|
|
958e1b |
Bugzilla: 1095690
|
|
|
eb5a2f |
RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
|
|
|
eb5a2f |
RH-Acked-by: Xiao Wang <jasowang@redhat.com>
|
|
|
958e1b |
RH-Acked-by: Juan Quintela <quintela@redhat.com>
|
|
|
eb5a2f |
|
|
|
eb5a2f |
CVE-2013-4150 QEMU 1.5.0 out-of-bounds buffer write in
|
|
|
eb5a2f |
virtio_net_load()@hw/net/virtio-net.c
|
|
|
eb5a2f |
|
|
|
eb5a2f |
This code is in hw/net/virtio-net.c:
|
|
|
eb5a2f |
|
|
|
eb5a2f |
if (n->max_queues > 1) {
|
|
|
eb5a2f |
if (n->max_queues != qemu_get_be16(f)) {
|
|
|
eb5a2f |
error_report("virtio-net: different max_queues ");
|
|
|
eb5a2f |
return -1;
|
|
|
eb5a2f |
}
|
|
|
eb5a2f |
|
|
|
eb5a2f |
n->curr_queues = qemu_get_be16(f);
|
|
|
eb5a2f |
for (i = 1; i < n->curr_queues; i++) {
|
|
|
eb5a2f |
n->vqs[i].tx_waiting = qemu_get_be32(f);
|
|
|
eb5a2f |
}
|
|
|
eb5a2f |
}
|
|
|
eb5a2f |
|
|
|
eb5a2f |
Number of vqs is max_queues, so if we get invalid input here,
|
|
|
eb5a2f |
for example if max_queues = 2, curr_queues = 3, we get
|
|
|
eb5a2f |
write beyond end of the buffer, with data that comes from
|
|
|
eb5a2f |
wire.
|
|
|
eb5a2f |
|
|
|
eb5a2f |
This might be used to corrupt qemu memory in hard to predict ways.
|
|
|
eb5a2f |
Since we have lots of function pointers around, RCE might be possible.
|
|
|
eb5a2f |
|
|
|
eb5a2f |
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
|
eb5a2f |
Acked-by: Jason Wang <jasowang@redhat.com>
|
|
|
eb5a2f |
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
|
|
|
eb5a2f |
Signed-off-by: Juan Quintela <quintela@redhat.com>
|
|
|
eb5a2f |
(cherry picked from commit eea750a5623ddac7a61982eec8f1c93481857578)
|
|
|
eb5a2f |
|
|
|
eb5a2f |
Tested: lightly on developer's box
|
|
|
958e1b |
Brew build: http:
|
|
|
958e1b |
Bugzilla: 1095690
|
|
|
eb5a2f |
|
|
|
eb5a2f |
hw/net/virtio-net.c | 5 +++++
|
|
|
eb5a2f |
1 file changed, 5 insertions(+)
|
|
|
eb5a2f |
|
|
|
eb5a2f |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
eb5a2f |
|
|
|
eb5a2f |
hw/net/virtio-net.c | 5 +++++
|
|
|
eb5a2f |
1 files changed, 5 insertions(+), 0 deletions(-)
|
|
|
eb5a2f |
|
|
|
eb5a2f |
diff
|
|
|
958e1b |
index 2d559e0..007cc2a 100644
|
|
|
eb5a2f |
|
|
|
eb5a2f |
|
|
|
958e1b |
@@ -1327,6 +1327,11 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
|
|
|
eb5a2f |
}
|
|
|
eb5a2f |
|
|
|
eb5a2f |
n->curr_queues = qemu_get_be16(f);
|
|
|
eb5a2f |
+ if (n->curr_queues > n->max_queues) {
|
|
|
eb5a2f |
+ error_report("virtio-net: curr_queues %x > max_queues %x",
|
|
|
eb5a2f |
+ n->curr_queues, n->max_queues);
|
|
|
eb5a2f |
+ return -1;
|
|
|
eb5a2f |
+ }
|
|
|
eb5a2f |
for (i = 1; i < n->curr_queues; i++) {
|
|
|
eb5a2f |
n->vqs[i].tx_waiting = qemu_get_be32(f);
|
|
|
eb5a2f |
}
|
|
|
eb5a2f |
--
|
|
|
eb5a2f |
1.7.1
|
|
|
eb5a2f |
|