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 X-Spam-Level: X-Spam-Status: No, score=-10.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 7C54BC433DB for ; Tue, 16 Mar 2021 14:34:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A58A65077 for ; Tue, 16 Mar 2021 14:34:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235268AbhCPOdw (ORCPT ); Tue, 16 Mar 2021 10:33:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233532AbhCPOdW (ORCPT ); Tue, 16 Mar 2021 10:33:22 -0400 Received: from mail-io1-xd2a.google.com (mail-io1-xd2a.google.com [IPv6:2607:f8b0:4864:20::d2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43413C06174A for ; Tue, 16 Mar 2021 07:33:22 -0700 (PDT) Received: by mail-io1-xd2a.google.com with SMTP id n132so37380807iod.0 for ; Tue, 16 Mar 2021 07:33:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=q/7bUx2ojAKrW6WgffbugKW8m/FPOBCZYXbC80AEUMc=; b=z76CH+WeqlQ+pu7RK+WzjqujAOQ6/CmXvi4GjO0DCt3fs5AYzWpny3D1bjIokaY/pC JA3rYTf4VVtgGp3EdjZ78U9ODvIVKbq5hBBWF6VDrqqVuGrScMLGFVToGl3B+E+njJGO QpvtNAWnjUJUakiX5mY5bypyERM2o3TTfIa79bYsVMew23xqPtea7cPnWoQ1QtEPI63C coIscGADK9JfYQyGe6Qv9ozlIFwHwszMW50AXhUyBVEAnaSM6GiEfoq6xEI9668T9t5M 8o1IFbAf89Mf+YxlXhe0kYgymsD+N4lCX0jPg8BfgvJdzlYX/UwHVXE9PaQusIxkVlmF uy8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=q/7bUx2ojAKrW6WgffbugKW8m/FPOBCZYXbC80AEUMc=; b=TIpCgaelGWLjsJtLXUSZLjmOZ6RrBvqNN1dMCsH5kWm5vYImGlNN1BQFhdGMaBxx34 iRrWrQqB+xyavu3jPGSSz5AaEe+ASvJ+qBzS1CafJOAjYH1WYk3GZbDDWwNC+r03uE0F bPhb/oVCy0/lvyq3qydGm6zwhcWX8auV7JouKcto/Et3QlBB9IimmaIctj3xXnaSgxRi Fte3Yv1WXY8GirEFNcQSrn+IFFXOUpHH3AZ9ToTnH0W+r96HIzYppbI+uyEZC69UmDut Vm9qCimI94xRNDjjtM+4m8UIBtrlZFXZyuEF4SdyHuZZnhz0xWd0i7u+Nn1OdhDljVeE r9Xw== X-Gm-Message-State: AOAM5337NYb3lQicu0gnStUR24KCidZmPG3TJ/ktvDPa43JUhlxfcNNq Dianu14PNM6Gw6S2dZd6DeUIXw== X-Google-Smtp-Source: ABdhPJwPO1EQcYJZ3fJbKhMNm75wFqtlTEhkQOWrkrVPpM2B92os95Di1BLlnJW0D1fpwToyGzkhIA== X-Received: by 2002:a5e:8d05:: with SMTP id m5mr3570773ioj.114.1615905201756; Tue, 16 Mar 2021 07:33:21 -0700 (PDT) Received: from [192.168.1.30] ([65.144.74.34]) by smtp.gmail.com with ESMTPSA id d22sm8423199iof.48.2021.03.16.07.33.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Mar 2021 07:33:21 -0700 (PDT) Subject: Re: [PATCH v2] task_work: kasan: record task_work_add() call stack To: Walter Wu , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrey Konovalov , Andrew Morton , Oleg Nesterov Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wsd_upstream , linux-mediatek@lists.infradead.org References: <20210316024410.19967-1-walter-zh.wu@mediatek.com> From: Jens Axboe Message-ID: <7d5b6e38-2e11-06f7-0a6b-356bdda0cd5b@kernel.dk> Date: Tue, 16 Mar 2021 08:33:20 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210316024410.19967-1-walter-zh.wu@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/15/21 8:44 PM, Walter Wu wrote: > Why record task_work_add() call stack? > Syzbot reports many use-after-free issues for task_work, see [1]. > After see the free stack and the current auxiliary stack, we think > they are useless, we don't know where register the work, this work > may be the free call stack, so that we miss the root cause and > don't solve the use-after-free. > > Add task_work_add() call stack into KASAN auxiliary stack in > order to improve KASAN report. It is useful for programmers > to solve use-after-free issues. I think this is a very useful addition, especially as task_work proliferates. Reviewed-by: Jens Axboe -- Jens Axboe 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 X-Spam-Level: X-Spam-Status: No, score=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 CD755C433DB for ; Tue, 16 Mar 2021 14:33:49 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7C88464DD7 for ; Tue, 16 Mar 2021 14:33:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7C88464DD7 Authentication-Results: mail.kernel.org; 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Tue, 16 Mar 2021 07:33:21 -0700 (PDT) Subject: Re: [PATCH v2] task_work: kasan: record task_work_add() call stack To: Walter Wu , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrey Konovalov , Andrew Morton , Oleg Nesterov Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wsd_upstream , linux-mediatek@lists.infradead.org References: <20210316024410.19967-1-walter-zh.wu@mediatek.com> From: Jens Axboe Message-ID: <7d5b6e38-2e11-06f7-0a6b-356bdda0cd5b@kernel.dk> Date: Tue, 16 Mar 2021 08:33:20 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210316024410.19967-1-walter-zh.wu@mediatek.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210316_143325_633444_913FE386 X-CRM114-Status: GOOD ( 12.80 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 3/15/21 8:44 PM, Walter Wu wrote: > Why record task_work_add() call stack? > Syzbot reports many use-after-free issues for task_work, see [1]. > After see the free stack and the current auxiliary stack, we think > they are useless, we don't know where register the work, this work > may be the free call stack, so that we miss the root cause and > don't solve the use-after-free. > > Add task_work_add() call stack into KASAN auxiliary stack in > order to improve KASAN report. It is useful for programmers > to solve use-after-free issues. I think this is a very useful addition, especially as task_work proliferates. Reviewed-by: Jens Axboe -- Jens Axboe _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek 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 X-Spam-Level: X-Spam-Status: No, score=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 9D65DC433E0 for ; Tue, 16 Mar 2021 14:35:00 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 369CE6507B for ; 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Tue, 16 Mar 2021 07:33:21 -0700 (PDT) Subject: Re: [PATCH v2] task_work: kasan: record task_work_add() call stack To: Walter Wu , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrey Konovalov , Andrew Morton , Oleg Nesterov Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wsd_upstream , linux-mediatek@lists.infradead.org References: <20210316024410.19967-1-walter-zh.wu@mediatek.com> From: Jens Axboe Message-ID: <7d5b6e38-2e11-06f7-0a6b-356bdda0cd5b@kernel.dk> Date: Tue, 16 Mar 2021 08:33:20 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210316024410.19967-1-walter-zh.wu@mediatek.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210316_143324_850747_3E3CF5A4 X-CRM114-Status: GOOD ( 14.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/15/21 8:44 PM, Walter Wu wrote: > Why record task_work_add() call stack? > Syzbot reports many use-after-free issues for task_work, see [1]. > After see the free stack and the current auxiliary stack, we think > they are useless, we don't know where register the work, this work > may be the free call stack, so that we miss the root cause and > don't solve the use-after-free. > > Add task_work_add() call stack into KASAN auxiliary stack in > order to improve KASAN report. It is useful for programmers > to solve use-after-free issues. I think this is a very useful addition, especially as task_work proliferates. Reviewed-by: Jens Axboe -- Jens Axboe _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel