From patchwork Fri Oct 9 17:02:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandr Nogikh X-Patchwork-Id: 288698 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5064C433E7 for ; Fri, 9 Oct 2020 17:02:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6BA8A2087D for ; Fri, 9 Oct 2020 17:02:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="lFxqgpOm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390133AbgJIRC0 (ORCPT ); Fri, 9 Oct 2020 13:02:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390077AbgJIRCR (ORCPT ); Fri, 9 Oct 2020 13:02:17 -0400 Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 04D0FC0613D2; Fri, 9 Oct 2020 10:02:16 -0700 (PDT) Received: by mail-wr1-x442.google.com with SMTP id i1so4904424wro.1; Fri, 09 Oct 2020 10:02:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=mKF6JhtMIXBsKg0vHpcDdJeueS/mg2O52LZjELoH3og=; b=lFxqgpOmRGHdJEcIJAP7v12BeUXTlgAorPjZm6ANUJElw+zBAqqbkcFa+2TZkniPEp fMAvNxJQ7JagxpamezJva6YZzOW+UM75fknUtzV0Q2bhjgINro8XeWpJjVFSzJ5rZS/F pGllLlrAH/ecJBevhah+9KsCqSAjPmamruOi3fiW+ujkRqhVdmcF9+U5R7DwSJAG87Em sGeldnzNWiZEyHnfdqj6yuIR0xmtct18EKrJfg6CM4b3EvpIMOU+gCLTPnO/ZEXfXM3u 9dWl6Gl7gcE6xWCF+UnhK0B5fZz5oNAKh1AEBLrxIhX1OBumVR5/yOxT8hgaQiW5JTht uMUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=mKF6JhtMIXBsKg0vHpcDdJeueS/mg2O52LZjELoH3og=; b=rBOwyfwqxcwG50c2WKHNvhx2nIqg5YvgGakyzbXcGmmJbm94Fkn4GV3Mq9OTg2m+ld 22reIYPP215h0yWIwGH15fY3f8+adiOfpRHyfO4IVuVw1fn4mqJByrTmFCvy3Vs7TNX7 KK7w7z80vVhDKoYd0yoCFp2NyPggkM5315YQRR0qbaC7S7zK0VK4sqsvVXe51PfPw8lI aaDmRoUUekKDyAM8rHSB6nvqVwUaByHhGlO+mugNJ9sQULXZ0FtVhANAd+QwWq0liqEt kt7PaQoRgsmnmho0aDWJrff1y2qppTvH4RWMVRPAJN9rMM3aRqgPy+OyXAvWlBjMEh8g eLvQ== X-Gm-Message-State: AOAM530kH3Pjh9TG9bMzKsBaRAehyIIunu2SWVH1UJwqZrAnmtS5529A br7A5km6drsV4xBVNFWwgws= X-Google-Smtp-Source: ABdhPJzTbbRyOrhoR4rqhttREvHmMOpgUTTng6NhSXCOuxloTMcVE4NdZDC1+VEJXMHSY6i+XN98ZQ== X-Received: by 2002:adf:e741:: with SMTP id c1mr3975317wrn.16.1602262934750; Fri, 09 Oct 2020 10:02:14 -0700 (PDT) Received: from nogikh.c.googlers.com.com (88.140.78.34.bc.googleusercontent.com. [34.78.140.88]) by smtp.gmail.com with ESMTPSA id s6sm13211092wrg.92.2020.10.09.10.02.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 10:02:14 -0700 (PDT) From: Aleksandr Nogikh To: davem@davemloft.net, kuba@kernel.org, johannes@sipsolutions.net, akpm@linux-foundation.org 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, nogikh@google.com Subject: [PATCH v2 1/3] kernel: make kcov_common_handle consider the current context Date: Fri, 9 Oct 2020 17:02:00 +0000 Message-Id: <20201009170202.103512-2-a.nogikh@gmail.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog In-Reply-To: <20201009170202.103512-1-a.nogikh@gmail.com> References: <20201009170202.103512-1-a.nogikh@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Aleksandr Nogikh kcov_common_handle is a method that is used to obtain a "default" KCOV remote handle of the current process. The handle can later be passed to kcov_remote_start in order to collect coverage for the processing that is initiated by one process, but done in another. For details see Documentation/dev-tools/kcov.rst and comments in kernel/kcov.c. Presently, if kcov_common_handle is called in a hard IRQ context, it will return a handle for the interrupted process. This may lead to unreliable and incorrect coverage collection. Adjust the behavior of kcov_common_handle in the following way. If it is called in a task context, return the common handle for the currently running task. Otherwise, return 0. It will make the returned value more reliable and also will make it possible to use kcov_remote_handle in routines that can be called from any context. Signed-off-by: Aleksandr Nogikh Reviewed-by: Andrey Konovalov --- v2: * Added this patch to the series. --- kernel/kcov.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/kcov.c b/kernel/kcov.c index 6b8368be89c8..80bfe71bbe13 100644 --- a/kernel/kcov.c +++ b/kernel/kcov.c @@ -1023,6 +1023,8 @@ EXPORT_SYMBOL(kcov_remote_stop); /* See the comment before kcov_remote_start() for usage details. */ u64 kcov_common_handle(void) { + if (!in_task()) + return 0; return current->kcov_handle; } EXPORT_SYMBOL(kcov_common_handle); From patchwork Fri Oct 9 17:02:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandr Nogikh X-Patchwork-Id: 299180 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97CF1C433E7 for ; Fri, 9 Oct 2020 17:02:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 62DF122284 for ; Fri, 9 Oct 2020 17:02:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GVQP7OQi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390123AbgJIRCZ (ORCPT ); Fri, 9 Oct 2020 13:02:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390097AbgJIRCV (ORCPT ); Fri, 9 Oct 2020 13:02:21 -0400 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC198C0613D5; Fri, 9 Oct 2020 10:02:17 -0700 (PDT) Received: by mail-wr1-x443.google.com with SMTP id g12so11013269wrp.10; Fri, 09 Oct 2020 10:02:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=HR1csYALqNVbMtUVDiaNlzvED0SHVfHnv16440TYZV0=; b=GVQP7OQii4vNJLZshY9gLFxRrrof0aroC7wtRUcdB+TUKc5w2F9W574Ur1sdF5McpA FMNuCENvUMaMaxPXIN5RCVODEQbPBTOcS3E7Q8A8RdmQlfl9XUjufZOj38ptw0fzkfvF qZiNgrMU7S4c8A7TqMOvAcznH3BQbFmTx5V+RhSAe1hCX3RRRcUOp6bp7+Dov77B9dFu eHBOhRPdQ+wGkUVbjbupWVnpHzvDR4HR/MmB+6S9NujCboTJ4smnyPY+aKKf/BJB10lp Pt+5eOGxo7kB829k85aHYTNDUVGHtrPjfCEUFLAnifIEgV14lwosRizTgww+Og8CSRIB 0kDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=HR1csYALqNVbMtUVDiaNlzvED0SHVfHnv16440TYZV0=; b=tPkiR8z0dY7RsHcfGi5K688saGyMD9kgahEUOoey8hG6tb6iNmEeLyYBD8O3HTzPom 6FfVH99bvQOpHp1evgn6KA0gY1vY6S0sJsy+Y2TFFNra/CYUpYFF/ULHmYKcdokF4Czh HbqKos4zEzputxiOvClK59mjwEf5Ra0pRtN4Ami4+uSZ2+MhPP26UC/pexzTqiP01ftq abhiNGau3ETPBb16qzS2SF7A1iqShM/yuZzvgSsvH/QIsXX+a/Buj2yH+nLh2iduexvk 0UOKrid5dQDIIqdVaPFIp71TpI3xxWdB8ywcl0aphAufZKbU7RPJx93PD1f8AoN8/36q Hgog== X-Gm-Message-State: AOAM532trm7zuNKiJFce6Kc5IsccVJISMJgEjslbzh+W06ew2Pt6zxiE vX6ACHleUFzGvWaMk+F4Fk0= X-Google-Smtp-Source: ABdhPJyIgnBC5YaLOtqcsGMghxQSaITFs+HI88lNk67nbO3WIVDGGhd2qLeJUYL3992byDXOn0XiBQ== X-Received: by 2002:a5d:4a06:: with SMTP id m6mr15667171wrq.209.1602262936531; Fri, 09 Oct 2020 10:02:16 -0700 (PDT) Received: from nogikh.c.googlers.com.com (88.140.78.34.bc.googleusercontent.com. [34.78.140.88]) by smtp.gmail.com with ESMTPSA id s6sm13211092wrg.92.2020.10.09.10.02.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 10:02:15 -0700 (PDT) From: Aleksandr Nogikh To: davem@davemloft.net, kuba@kernel.org, johannes@sipsolutions.net, akpm@linux-foundation.org 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, nogikh@google.com Subject: [PATCH v2 2/3] net: store KCOV remote handle in sk_buff Date: Fri, 9 Oct 2020 17:02:01 +0000 Message-Id: <20201009170202.103512-3-a.nogikh@gmail.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog In-Reply-To: <20201009170202.103512-1-a.nogikh@gmail.com> References: <20201009170202.103512-1-a.nogikh@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Aleksandr Nogikh Remote KCOV coverage collection enables coverage-guided fuzzing of the code that is not reachable during normal system call execution. It is especially helpful for fuzzing networking subsystems, where it is common to perform packet handling in separate work queues even for the packets that originated directly from the user space. More details can be found in Documentation/dev-tools/kcov.rst. Enable coverage-guided frame injection by adding a kcov_handle parameter to sk_buff structure. Initializate this field in __alloc_skb to kcov_common_handle() so that no socket buffer that was generated during a system call is missed. For sk_buffs that were allocated in an interrupt context, kcov_handle will be initialized to 0. Code that is of interest and that performs packet processing should be annotated with kcov_remote_start()/kcov_remote_stop(). An alternative approach is to determine kcov_handle solely on the basis of the device/interface that received the specific socket buffer. However, in this case it would be impossible to distinguish between packets that originated from normal background network processes and those that were intentionally injected from the user space. Signed-off-by: Aleksandr Nogikh --- v2: * Updated the commit message. --- include/linux/skbuff.h | 21 +++++++++++++++++++++ net/core/skbuff.c | 1 + 2 files changed, 22 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index a828cf99c521..5639f27e05ef 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -701,6 +701,7 @@ typedef unsigned char *sk_buff_data_t; * @transport_header: Transport layer header * @network_header: Network layer header * @mac_header: Link layer header + * @kcov_handle: KCOV remote handle for remote coverage collection * @tail: Tail pointer * @end: End pointer * @head: Head of buffer @@ -904,6 +905,10 @@ struct sk_buff { __u16 network_header; __u16 mac_header; +#ifdef CONFIG_KCOV + u64 kcov_handle; +#endif + /* private: */ __u32 headers_end[0]; /* public: */ @@ -4605,5 +4610,21 @@ static inline void skb_reset_redirect(struct sk_buff *skb) #endif } +static inline void skb_set_kcov_handle(struct sk_buff *skb, const u64 kcov_handle) +{ +#ifdef CONFIG_KCOV + skb->kcov_handle = kcov_handle; +#endif +} + +static inline u64 skb_get_kcov_handle(struct sk_buff *skb) +{ +#ifdef CONFIG_KCOV + return skb->kcov_handle; +#else + return 0; +#endif +} + #endif /* __KERNEL__ */ #endif /* _LINUX_SKBUFF_H */ diff --git a/net/core/skbuff.c b/net/core/skbuff.c index f67631faa9aa..e7acd7d45b03 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -233,6 +233,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, skb->end = skb->tail + size; skb->mac_header = (typeof(skb->mac_header))~0U; skb->transport_header = (typeof(skb->transport_header))~0U; + skb_set_kcov_handle(skb, kcov_common_handle()); /* make sure we initialize shinfo sequentially */ shinfo = skb_shinfo(skb); From patchwork Fri Oct 9 17:02:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandr Nogikh X-Patchwork-Id: 288697 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D4673C433DF for ; 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[34.78.140.88]) by smtp.gmail.com with ESMTPSA id s6sm13211092wrg.92.2020.10.09.10.02.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 10:02:17 -0700 (PDT) From: Aleksandr Nogikh To: davem@davemloft.net, kuba@kernel.org, johannes@sipsolutions.net, akpm@linux-foundation.org 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, nogikh@google.com Subject: [PATCH v2 3/3] mac80211: add KCOV remote annotations to incoming frame processing Date: Fri, 9 Oct 2020 17:02:02 +0000 Message-Id: <20201009170202.103512-4-a.nogikh@gmail.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog In-Reply-To: <20201009170202.103512-1-a.nogikh@gmail.com> References: <20201009170202.103512-1-a.nogikh@gmail.com> MIME-Version: 1.0 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. This will enable coverage-guided fuzzing of mac80211 code that processes incoming 802.11 frames. Signed-off-by: Aleksandr Nogikh --- v2: * The commit now affects ieee80211_rx instead of ieee80211_tasklet_handler. --- include/net/mac80211.h | 2 ++ net/mac80211/iface.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 4747d446179a..011d9e115ebb 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -4496,7 +4496,9 @@ void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *sta, */ static inline void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) { + kcov_remote_start_common(skb_get_kcov_handle(skb)); ieee80211_rx_napi(hw, NULL, skb, NULL); + kcov_remote_stop(); } /** 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 */