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Message-ID: <9C169F9F-D2C0-40F9-92B2-5FBDEBDD4FDE@oracle.com>
Date: Wed, 24 Jul 2024 17:23:47 +0000
From: John Haxby <john.haxby@...cle.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
CC: Dongli Zhang <dongli.zhang@...cle.com>
Subject: inux kernel: virtio-net host dos
Hello,
We recently have discovered a Denial-of-Service (DoS) attack issue that
a KVM guest VM using virtio-net can crash the Linux host by sending a
short packet (i.e. size < ETH_HLEN). The packet may traverse through
vhost-net, macvtap and vlan without any validation/drop. When this
packet is presented to mlx5 driver on the host side, the host panic
happens, since mlx5_core assumes the frame size is always >= ETH_HLEN.
Patches have been posted to netdev with the following cover letter.
I'll post the commit IDs when I have them.
jch
~~~
Message-Id: <20240724170452.16837-1-dongli.zhang@...cle.com>
Date: Wed, 24 Jul 2024 10:04:50 -0700
From: Dongli Zhang <dongli.zhang@...cle.com>
To: <netdev@...r.kernel.org>
Subject: [PATCH net 0/2] tap/tun: harden by dropping short frame
This is to harden all of tap/tun to avoid any short frame smaller than the
Ethernet header (ETH_HLEN).
While the xen-netback already rejects short frame smaller than ETH_HLEN ...
914 static void xenvif_tx_build_gops(struct xenvif_queue *queue,
915 int budget,
916 unsigned *copy_ops,
917 unsigned *map_ops)
918 {
... ...
1007 if (unlikely(txreq.size < ETH_HLEN)) {
1008 netdev_dbg(queue->vif->dev,
1009 "Bad packet size: %d\n", txreq.size);
1010 xenvif_tx_err(queue, &txreq, extra_count, idx);
1011 break;
1012 }
... the short frame may not be dropped by vhost-net/tap/tun.
This fixes CVE-2024-41090 and CVE-2024-41091.
Thank you very much!
Dongli Zhang
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