linux-kernel - [PATCH 2/2] mac80211: add KCOV remote annotations to incoming frame processing

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Date:   Wed,  7 Oct 2020 10:17:26 +0000
From:   Aleksandr Nogikh <a.nogikh@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, johannes@...solutions.net
Cc:     edumazet@...gle.com, andreyknvl@...gle.com, dvyukov@...gle.com,
        elver@...gle.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        nogikh@...gle.com
Subject: [PATCH 2/2] mac80211: add KCOV remote annotations to incoming frame processing

From: Aleksandr Nogikh <nogikh@...gle.com>

Add KCOV remote annotations to ieee80211_iface_work and
ieee80211_tasklet_handler. This will enable coverage-guided fuzzing of
mac80211 code that processes incoming 802.11 frames.

Signed-off-by: Aleksandr Nogikh <nogikh@...gle.com>
---
 net/mac80211/iface.c | 2 ++
 net/mac80211/main.c  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 240862a74a0f..482d2ae46e71 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1377,6 +1377,7 @@ 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;
@@ -1486,6 +1487,7 @@ static void ieee80211_iface_work(struct work_struct *work)
 		}
 
 		kfree_skb(skb);
+		kcov_remote_stop();
 	}
 
 	/* then other type-dependent work */
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 523380aed92e..d7eebafc14e0 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -227,6 +227,7 @@ static void ieee80211_tasklet_handler(unsigned long data)
 
 	while ((skb = skb_dequeue(&local->skb_queue)) ||
 	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
+		kcov_remote_start_common(skb_get_kcov_handle(skb));
 		switch (skb->pkt_type) {
 		case IEEE80211_RX_MSG:
 			/* Clear skb->pkt_type in order to not confuse kernel
@@ -244,6 +245,7 @@ static void ieee80211_tasklet_handler(unsigned long data)
 			dev_kfree_skb(skb);
 			break;
 		}
+		kcov_remote_stop();
 	}
 }
 
-- 
2.28.0.806.g8561365e88-goog