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mac80211: add KCOV remote annotations to incoming frame processing

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Add KCOV remote annotations to ieee80211_iface_work() and
ieee80211_rx_list(). This will enable coverage-guided fuzzing of
mac80211 code that processes incoming 802.11 frames.

Signed-off-by: Aleksandr Nogikh <nogikh@google.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Aleksandr Nogikh 2020-10-29 17:36:20 +00:00 committed by Jakub Kicinski
parent 6370cc3bbd
commit 261e411bb2
2 changed files with 11 additions and 7 deletions
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2
net/mac80211/iface.c
View File

@ -1356,6 +1356,7 @@ static void ieee80211_iface_work(struct work_struct *work)
while ((skb = skb_dequeue(&sdata->skb_queue))) {
struct ieee80211_mgmt *mgmt = (void *)skb->data;
kcov_remote_start_common(skb_get_kcov_handle(skb));
if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_BACK) {
int len = skb->len;
@ -1465,6 +1466,7 @@ static void ieee80211_iface_work(struct work_struct *work)
}
kfree_skb(skb);
kcov_remote_stop();
}
/* then other type-dependent work */

16
net/mac80211/rx.c
View File

@ -4742,6 +4742,8 @@ void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
status->rx_flags = 0;
kcov_remote_start_common(skb_get_kcov_handle(skb));
/*
* Frames with failed FCS/PLCP checksum are not returned,
* all other frames are returned without radiotap header
@ -4749,15 +4751,15 @@ void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
* Also, frames with less than 16 bytes are dropped.
*/
skb = ieee80211_rx_monitor(local, skb, rate);
if (!skb)
return;
if (skb) {
ieee80211_tpt_led_trig_rx(local,
((struct ieee80211_hdr *)skb->data)->frame_control,
skb->len);
ieee80211_tpt_led_trig_rx(local,
((struct ieee80211_hdr *)skb->data)->frame_control,
skb->len);
__ieee80211_rx_handle_packet(hw, pubsta, skb, list);
__ieee80211_rx_handle_packet(hw, pubsta, skb, list);
}
kcov_remote_stop();
return;
drop:
kfree_skb(skb);