From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F698C433EF for ; Wed, 2 Mar 2022 08:29:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240161AbiCBIak (ORCPT ); Wed, 2 Mar 2022 03:30:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240148AbiCBIaa (ORCPT ); Wed, 2 Mar 2022 03:30:30 -0500 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B7E94B91F9 for ; Wed, 2 Mar 2022 00:29:45 -0800 (PST) Received: by mail-wm1-x32a.google.com with SMTP id c18-20020a7bc852000000b003806ce86c6dso2724843wml.5 for ; Wed, 02 Mar 2022 00:29:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=anfYM1xs0NBMLGEeqezGOYJl+MN+3QcGgOkQ0d7W1KU=; b=T250LPSLKUXQUaclMSeK0mZPrWImkaAZdf7+pxpZvYBVIjiMfRgaCAywrd9G1ZgB/0 RPeRZER9ugo42HQs7vOFLBMSQPAOYqXg/oajPZgQ5ONy0UZDqxelCW0yWfe1ksHhPrcL P/a98j6H0buLuTut7KDXTAftRVTqbi5jMarQoWo0xKWi9Z3HP4a7XxZrRZ0rOP/uX4Az LLIvmIk/579eXMZTSFWGq2fEQFgW+uDPuDijzIupYzselXw2nRaSOd5AugqhhPqSZ3gc FEmfiAKLSrRBVcbA2KYP4MfAaSSA9cu4RGT+7dOnfaFc9d8vJLURer8fML3X+2CR2b/7 ze5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=anfYM1xs0NBMLGEeqezGOYJl+MN+3QcGgOkQ0d7W1KU=; b=Sz3LvOwrPWwdRloZ+enu3F6PVNPanXcSamPEvYoY4T4nP+FFN0sZ8VeNUoP1hg2Jgt PxxY2hjciVWutWobkK6vmkxsYqAicyJxQyKrlL5TO5rQoRgu2Ofe0osVHK5pd/L+NQrx 2JdBrUd1/1a35KayGZS1fkQDAnSShIZI0YCcjN3lZ52RPB7fJf95YP4HLTssigKJe4vw qVfWKN7Y2fdyCSFLuYqRDN9brh7ZOqR1UD9uzCOk2Isu8b4stI0OISoVxLIr8yr8VYfL IZA4jYs6pLsWR8JbQMfiZlHfifQ0B0jN6L8Qz1tuZ6uIJ3jqpLr6Ij9C7laCSphkRtl3 UXbg== X-Gm-Message-State: AOAM532TjXAh8MirZNSKxLsbh5nY7i5bH7UpIQLSKbN7hzla6n/5Rns7 qcj9+0+7hRM6kasFSBxZYLv5BQ== X-Google-Smtp-Source: ABdhPJyejoqO4Ua2lw3doPCMFKI7AoknOX/n2Hq9a7QihlNIy2VB0jsIjJbRKAzoK9Beq8n1Bceu5Q== X-Received: by 2002:a1c:a915:0:b0:380:e3de:b78f with SMTP id s21-20020a1ca915000000b00380e3deb78fmr20356178wme.19.1646209784264; Wed, 02 Mar 2022 00:29:44 -0800 (PST) Received: from google.com (cpc155339-bagu17-2-0-cust87.1-3.cable.virginm.net. [86.27.177.88]) by smtp.gmail.com with ESMTPSA id z16-20020a7bc7d0000000b00381004c643asm4689971wmk.30.2022.03.02.00.29.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Mar 2022 00:29:43 -0800 (PST) Date: Wed, 2 Mar 2022 08:29:41 +0000 From: Lee Jones To: "Michael S. Tsirkin" Cc: syzbot , jasowang@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, virtualization@lists.linux-foundation.org Subject: Re: [syzbot] kernel BUG in vhost_get_vq_desc Message-ID: References: <00000000000070ac6505d7d9f7a8@google.com> <0000000000003b07b305d840b30f@google.com> <20220218063352-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220218063352-mutt-send-email-mst@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 18 Feb 2022, Michael S. Tsirkin wrote: > On Thu, Feb 17, 2022 at 05:21:20PM -0800, syzbot wrote: > > syzbot has found a reproducer for the following issue on: > > > > HEAD commit: f71077a4d84b Merge tag 'mmc-v5.17-rc1-2' of git://git.kern.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=104c04ca700000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=a78b064590b9f912 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3140b17cb44a7b174008 > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1362e232700000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11373a6c700000 > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+3140b17cb44a7b174008@syzkaller.appspotmail.com > > > > ------------[ cut here ]------------ > > kernel BUG at drivers/vhost/vhost.c:2335! > > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > > CPU: 1 PID: 3597 Comm: vhost-3596 Not tainted 5.17.0-rc4-syzkaller-00054-gf71077a4d84b #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > > RIP: 0010:vhost_get_vq_desc+0x1d43/0x22c0 drivers/vhost/vhost.c:2335 > > Code: 00 00 00 48 c7 c6 20 2c 9d 8a 48 c7 c7 98 a6 8e 8d 48 89 ca 48 c1 e1 04 48 01 d9 e8 b7 59 28 fd e9 74 ff ff ff e8 5d c8 a1 fa <0f> 0b e8 56 c8 a1 fa 48 8b 54 24 18 48 b8 00 00 00 00 00 fc ff df > > RSP: 0018:ffffc90001d1fb88 EFLAGS: 00010293 > > RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 > > RDX: ffff8880234b0000 RSI: ffffffff86d715c3 RDI: 0000000000000003 > > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 > > R10: ffffffff86d706bc R11: 0000000000000000 R12: ffff888072c24d68 > > R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888072c24bb0 > > FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000000000002 CR3: 000000007902c000 CR4: 00000000003506e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > > > vhost_vsock_handle_tx_kick+0x277/0xa20 drivers/vhost/vsock.c:522 > > vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372 > > kthread+0x2e9/0x3a0 kernel/kthread.c:377 > > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > > I don't see how this can trigger normally so I'm assuming > another case of use after free. Yes, exactly. I patched it. Please see: https://lore.kernel.org/all/20220302075421.2131221-1-lee.jones@linaro.org/T/#t -- Lee Jones [李琼斯] Principal Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8FE32C433F5 for ; Wed, 2 Mar 2022 08:29:51 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 2813B60BC3; Wed, 2 Mar 2022 08:29:51 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id geRBVYDiHSdJ; Wed, 2 Mar 2022 08:29:50 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp3.osuosl.org (Postfix) with ESMTPS id 957FE607A4; Wed, 2 Mar 2022 08:29:49 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7936FC0012; Wed, 2 Mar 2022 08:29:49 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [IPv6:2605:bc80:3010::133]) by lists.linuxfoundation.org (Postfix) with ESMTP id B65FAC000B for ; Wed, 2 Mar 2022 08:29:47 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id A9993403C4 for ; Wed, 2 Mar 2022 08:29:47 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp2.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=linaro.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mLP-H2F4pVAR for ; Wed, 2 Mar 2022 08:29:46 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from mail-wm1-x330.google.com (mail-wm1-x330.google.com [IPv6:2a00:1450:4864:20::330]) by smtp2.osuosl.org (Postfix) with ESMTPS id 1669240396 for ; Wed, 2 Mar 2022 08:29:46 +0000 (UTC) Received: by mail-wm1-x330.google.com with SMTP id p184-20020a1c29c1000000b0037f76d8b484so726947wmp.5 for ; Wed, 02 Mar 2022 00:29:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=anfYM1xs0NBMLGEeqezGOYJl+MN+3QcGgOkQ0d7W1KU=; b=T250LPSLKUXQUaclMSeK0mZPrWImkaAZdf7+pxpZvYBVIjiMfRgaCAywrd9G1ZgB/0 RPeRZER9ugo42HQs7vOFLBMSQPAOYqXg/oajPZgQ5ONy0UZDqxelCW0yWfe1ksHhPrcL P/a98j6H0buLuTut7KDXTAftRVTqbi5jMarQoWo0xKWi9Z3HP4a7XxZrRZ0rOP/uX4Az LLIvmIk/579eXMZTSFWGq2fEQFgW+uDPuDijzIupYzselXw2nRaSOd5AugqhhPqSZ3gc FEmfiAKLSrRBVcbA2KYP4MfAaSSA9cu4RGT+7dOnfaFc9d8vJLURer8fML3X+2CR2b/7 ze5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=anfYM1xs0NBMLGEeqezGOYJl+MN+3QcGgOkQ0d7W1KU=; b=uzKHHS4J8RrUIiTphRjBzGDH2hKGAbwrOs7q6sGsM5Z+wkWivwKu0lz85dhkEW4bDS EiignvM7hyGKI4lxOeZF6c58k7Rj8/waQ5EgqXR1qb3776cwORxUz/lzvrteWlUjnns5 rc7odeIURJqrjcrkEYrBQGnfEUOXBDGNQDy5k41aYzwwlcaLFsLpoVtL/XUJZu/brVWL 2monaVstZsFX2SmWoEphPjeHKwMQtW6QP6zdkpNJgAGo9HOJ1R9Yj94a5bME2GA3t9Z6 4HhSznjpgb9NQtozWuTz8mjEEKYrbsfV2Olla9ki0wjKuHBIjyAUEw7x3btuj/IKnutp SP3g== X-Gm-Message-State: AOAM5325ATlIF0hSztNC28/Omh0iJ86cM6w8yUZhdXk+IXFAR7mOgsA6 n0EU5Y17tP/bBRmMrdvAqJUQkw== X-Google-Smtp-Source: ABdhPJyejoqO4Ua2lw3doPCMFKI7AoknOX/n2Hq9a7QihlNIy2VB0jsIjJbRKAzoK9Beq8n1Bceu5Q== X-Received: by 2002:a1c:a915:0:b0:380:e3de:b78f with SMTP id s21-20020a1ca915000000b00380e3deb78fmr20356178wme.19.1646209784264; Wed, 02 Mar 2022 00:29:44 -0800 (PST) Received: from google.com (cpc155339-bagu17-2-0-cust87.1-3.cable.virginm.net. [86.27.177.88]) by smtp.gmail.com with ESMTPSA id z16-20020a7bc7d0000000b00381004c643asm4689971wmk.30.2022.03.02.00.29.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Mar 2022 00:29:43 -0800 (PST) Date: Wed, 2 Mar 2022 08:29:41 +0000 From: Lee Jones To: "Michael S. Tsirkin" Subject: Re: [syzbot] kernel BUG in vhost_get_vq_desc Message-ID: References: <00000000000070ac6505d7d9f7a8@google.com> <0000000000003b07b305d840b30f@google.com> <20220218063352-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220218063352-mutt-send-email-mst@kernel.org> Cc: kvm@vger.kernel.org, syzbot , netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" T24gRnJpLCAxOCBGZWIgMjAyMiwgTWljaGFlbCBTLiBUc2lya2luIHdyb3RlOgoKPiBPbiBUaHUs 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