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net: Update MemReentrancyGuard for NIC

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Recently MemReentrancyGuard was added to DeviceState to record that the
device is engaging in I/O. The network device backend needs to update it
when delivering a packet to a device.

This implementation follows what bottom half does, but it does not add
a tracepoint for the case that the network device backend started
delivering a packet to a device which is already engaging in I/O. This
is because such reentrancy frequently happens for
qemu_flush_queued_packets() and is insignificant.

Fixes: CVE-2023-3019
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2023-06-01 12:18:59 +09:00 • committed by Jason Wang
parent 7d0fefdf81
commit 9050f976e4
2 changed files with 15 additions and 0 deletions
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1
include/net/net.h
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@ -126,6 +126,7 @@ typedef QTAILQ_HEAD(NetClientStateList, NetClientState) NetClientStateList;
typedef struct NICState {
NetClientState *ncs;
NICConf *conf;
MemReentrancyGuard *reentrancy_guard;
void *opaque;
bool peer_deleted;
} NICState;