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From 1cbb554a4057afd4d71c04757ef7fd1bbb7114ee Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Tue, 29 Jun 2021 03:42:46 -0400
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Subject: [PATCH 8/9] cadence_gem: switch to use qemu_receive_packet() for
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loopback
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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Message-id: <20210629034247.3286477-9-jmaloy@redhat.com>
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Patchwork-id: 101793
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O-Subject: [RHEL-8.4.0.z qemu-kvm PATCH v2 8/9] cadence_gem: switch to use qemu_receive_packet() for loopback
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Bugzilla: 1932917
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Alexander Bulekov <alxndr@bu.edu>
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This patch switches to use qemu_receive_packet() which can detect
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reentrancy and return early.
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This is intended to address CVE-2021-3416.
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Cc: Prasad J Pandit <ppandit@redhat.com>
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Cc: qemu-stable@nongnu.org
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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit e73adfbeec9d4e008630c814759052ed945c3fed)
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Conflict: upstream commit 24d62fd5028e ("net: cadence_gem: Move tx/rx
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packet buffert to CadenceGEMState") is missing in this version, so
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we stick to using the original stack variable tx_packet in the calls.
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/net/cadence_gem.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
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index b8be73dc55..be7c91123b 100644
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--- a/hw/net/cadence_gem.c
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+++ b/hw/net/cadence_gem.c
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@@ -1225,8 +1225,8 @@ static void gem_transmit(CadenceGEMState *s)
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/* Send the packet somewhere */
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if (s->phy_loop || (s->regs[GEM_NWCTRL] &
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GEM_NWCTRL_LOCALLOOP)) {
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- gem_receive(qemu_get_queue(s->nic), tx_packet,
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- total_bytes);
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+ qemu_receive_packet(qemu_get_queue(s->nic), tx_packet,
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+ total_bytes);
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} else {
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qemu_send_packet(qemu_get_queue(s->nic), tx_packet,
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total_bytes);
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--
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2.27.0
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