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

[Aleksandr Nogikh]

From: Aleksandr Nogikh <nog...@google.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 <nog...@google.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