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[34.78.140.88]) by smtp.gmail.com with ESMTPSA id t4sm852122wmb.20.2020.10.29.10.36.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2020 10:36:59 -0700 (PDT) From: Aleksandr Nogikh To: davem@davemloft.net, kuba@kernel.org, johannes@sipsolutions.net Cc: edumazet@google.com, andreyknvl@google.com, dvyukov@google.com, elver@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, willemdebruijn.kernel@gmail.com, Aleksandr Nogikh Subject: [PATCH v5 3/3] mac80211: add KCOV remote annotations to incoming frame processing Date: Thu, 29 Oct 2020 17:36:20 +0000 Message-Id: <20201029173620.2121359-4-aleksandrnogikh@gmail.com> X-Mailer: git-send-email 2.29.1.341.ge80a0c044ae-goog In-Reply-To: <20201029173620.2121359-1-aleksandrnogikh@gmail.com> References: <20201029173620.2121359-1-aleksandrnogikh@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Aleksandr Nogikh 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 --- v4 -> v5: * Using ieee80211_rx_list() instead of ieee80211_rx(). v1 -> v2: * The commit now affects ieee80211_rx() instead of ieee80211_tasklet_handler(). --- net/mac80211/iface.c | 2 ++ net/mac80211/rx.c | 16 +++++++++------- 2 files changed, 11 insertions(+), 7 deletions(-) diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 1be775979132..56a1bcea2c1c 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -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 */ diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 1e2e5a406d58..09d1c9fb8872 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -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; - - ieee80211_tpt_led_trig_rx(local, - ((struct ieee80211_hdr *)skb->data)->frame_control, - skb->len); + if (skb) { + 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); -- 2.29.1.341.ge80a0c044ae-goog