tree f538085c9963ed31cb8f84df51d9b18c8b389d25
parent 7d0fefdf81f5973334c344f6b8e1896c309dff66
author Akihiko Odaki <akihiko.odaki@daynix.com> 1685589539 +0900
committer Jason Wang <jasowang@redhat.com> 1700552554 +0800

net: Update MemReentrancyGuard for NIC

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>