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hw/net/net_tx_pkt: fix assertion failure in net_tx_pkt_add_raw_fragment()

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An assertion failure issue was found in the code that processes network packets
while adding data fragments into the packet context. It could be abused by a
malicious guest to abort the QEMU process on the host. This patch replaces the
affected assert() with a conditional statement, returning false if the current
data fragment exceeds max_raw_frags.

Reported-by: Alexander Bulekov <alxndr@bu.edu>
Reported-by: Ziming Zhang <ezrakiez@gmail.com>
Reviewed-by: Dmitry Fleytman <dmitry.fleytman@gmail.com>
Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Mauro Matteo Cascella 2020-08-01 18:42:38 +02:00 committed by Fei Xu
parent 2a884f8abb
commit c30f07cade
1 changed files with 40 additions and 0 deletions
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hw-net-net_tx_pkt-fix-assertion-failure-in-net_tx_pk.patch Normal file
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@ -0,0 +1,40 @@
From d65a00000e56ee2cec2f506b1408128d2df56ad9 Mon Sep 17 00:00:00 2001
From: Mauro Matteo Cascella <mcascell@redhat.com>
Date: Sat, 1 Aug 2020 18:42:38 +0200
Subject: [PATCH] hw/net/net_tx_pkt: fix assertion failure in
net_tx_pkt_add_raw_fragment()
An assertion failure issue was found in the code that processes network packets
while adding data fragments into the packet context. It could be abused by a
malicious guest to abort the QEMU process on the host. This patch replaces the
affected assert() with a conditional statement, returning false if the current
data fragment exceeds max_raw_frags.
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Reported-by: Ziming Zhang <ezrakiez@gmail.com>
Reviewed-by: Dmitry Fleytman <dmitry.fleytman@gmail.com>
Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
hw/net/net_tx_pkt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/hw/net/net_tx_pkt.c b/hw/net/net_tx_pkt.c
index 162f802dd7..54d4c3bbd0 100644
--- a/hw/net/net_tx_pkt.c
+++ b/hw/net/net_tx_pkt.c
@@ -379,7 +379,10 @@ bool net_tx_pkt_add_raw_fragment(struct NetTxPkt *pkt, hwaddr pa,
hwaddr mapped_len = 0;
struct iovec *ventry;
assert(pkt);
- assert(pkt->max_raw_frags > pkt->raw_frags);
+
+ if (pkt->raw_frags >= pkt->max_raw_frags) {
+ return false;
+ }
if (!len) {
return true;
--
2.23.0