forked from mirrors/nixpkgs
0c54b757e9
An assert(3) failure issue was found in the networking helper functions of QEMU. It could occur in the eth_get_gso_type() routine, if a packet does not have a valid networking L3 protocol (ex. IPv4, IPv6) value. A guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario. Fixes: CVE-2020-27617
44 lines
1.3 KiB
Diff
44 lines
1.3 KiB
Diff
From 6d19c0cc6c5a9bba308fc29d7c0edc2dc372c41b Mon Sep 17 00:00:00 2001
|
|
From: Prasad J Pandit <pjp@fedoraproject.org>
|
|
Date: Wed, 21 Oct 2020 11:35:50 +0530
|
|
Subject: [PATCH] net: remove an assert call in eth_get_gso_type
|
|
|
|
eth_get_gso_type() routine returns segmentation offload type based on
|
|
L3 protocol type. It calls g_assert_not_reached if L3 protocol is
|
|
unknown, making the following return statement unreachable. Remove the
|
|
g_assert call, it maybe triggered by a guest user.
|
|
|
|
Reported-by: Gaoning Pan <pgn@zju.edu.cn>
|
|
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
|
|
---
|
|
net/eth.c | 6 +++---
|
|
1 file changed, 3 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/net/eth.c b/net/eth.c
|
|
index 0c1d413ee2..eee77071f9 100644
|
|
--- a/net/eth.c
|
|
+++ b/net/eth.c
|
|
@@ -16,6 +16,7 @@
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
+#include "qemu/log.h"
|
|
#include "net/eth.h"
|
|
#include "net/checksum.h"
|
|
#include "net/tap.h"
|
|
@@ -71,9 +72,8 @@ eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto)
|
|
return VIRTIO_NET_HDR_GSO_TCPV6 | ecn_state;
|
|
}
|
|
}
|
|
-
|
|
- /* Unsupported offload */
|
|
- g_assert_not_reached();
|
|
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: probably not GSO frame, "
|
|
+ "unknown L3 protocol: 0x%04"PRIx16"\n", __func__, l3_proto);
|
|
|
|
return VIRTIO_NET_HDR_GSO_NONE | ecn_state;
|
|
}
|
|
--
|
|
2.28.0
|
|
|