[PATCH 2/8] wifi: mac80211_hwsim: authenticate PMSR report senders

[Zhao Li]

hwsim_pmsr_report_nl() looks up the radio by HWSIM_ATTR_ADDR_TRANSMITTER
and, when data->pmsr_request is set, parses the reported peer results,
hands them to cfg80211_pmsr_report(), then unconditionally clears
data->pmsr_request and calls cfg80211_pmsr_complete() to end the
measurement.

Unlike the sibling wmediumd data-path handlers
hwsim_tx_info_frame_received_nl() and hwsim_cloned_frame_received_nl(),
which check the sending socket's netgroup against data->netgroup and its
portid against data->wmediumd, this handler did not check the sender at
all, and its genl op carries no GENL_UNS_ADMIN_PERM flag. In non-virtio
(wmediumd) mode any process in the netns that can reach the hwsim
generic netlink family could therefore send a report. The transmitter
address is not secret, so such a process could inject spoofed ranging
results for another radio's in-flight request and, because the handler
always completes the measurement, terminate a ranging operation owned by
the real wmediumd session.

Reject reports whose sender does not match the registered wmediumd
instance, mirroring the sibling handlers: in non-virtio mode require
the sending socket's netgroup to equal data->netgroup and
info->snd_portid to equal data->wmediumd before touching the request
state.

Fixes: 2af3b2a631b1 ("mac80211_hwsim: add PMSR report support via virtio")
Assisted-by: Codex:gpt-5
Assisted-by: Claude:opus-4.8
Signed-off-by: Zhao Li <enderaoelyther@xxxxxxxxx>
---
 drivers/net/wireless/virtual/mac80211_hwsim_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/wireless/virtual/mac80211_hwsim_main.c b/drivers/net/wireless/virtual/mac80211_hwsim_main.c
index bc0818b525224..6bf9736098b67 100644
--- a/drivers/net/wireless/virtual/mac80211_hwsim_main.c
+++ b/drivers/net/wireless/virtual/mac80211_hwsim_main.c
@@ -4211,6 +4211,15 @@ static int hwsim_pmsr_report_nl(struct sk_buff *msg, struct genl_info *info)
 	if (!data)
 		return -EINVAL;
 
+	if (!hwsim_virtio_enabled) {
+		if (hwsim_net_get_netgroup(genl_info_net(info)) !=
+		    data->netgroup)
+			return -EINVAL;
+
+		if (info->snd_portid != data->wmediumd)
+			return -EPERM;
+	}
+
 	mutex_lock(&data->mutex);
 	if (!data->pmsr_request) {
 		err = -EINVAL;
-- 
2.50.1 (Apple Git-155)