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=-4.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 14432C48BE8 for ; Wed, 16 Jun 2021 19:41:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F332E6100A for ; Wed, 16 Jun 2021 19:41:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232920AbhFPTnQ (ORCPT ); Wed, 16 Jun 2021 15:43:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231262AbhFPTnN (ORCPT ); Wed, 16 Jun 2021 15:43:13 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96131C061574; Wed, 16 Jun 2021 12:41:07 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id x19so1658468pln.2; Wed, 16 Jun 2021 12:41:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=qb5d+U0Id8lIqAWfxQheAcWONeEcboJpT5+z508o/Ww=; b=HQF8dUO0vj/JLY5AGo7v2s8QQaIzYV63qYOxawNXAC3aRARyE+nU5hzCMBYgwpOUA+ q8nRzMkhc/tm6xxqwnopRUIz9WhF/HjXQjuanWT1+4mEkJ0UbKeZivFfZx94lhKOnQOP Ts7ZOjGA+YuFjIs9CLzBW3fINp+e9Um330Lz/Ig9wIZRxuRqLJJQam+5oQ2mzJV7WY1H yGwhgdKL8GJ1aWOeIyR1DNwwTwqNOo7pvB7p1J30SaPr82rNVxB7EhI/vk2o1PYt2hoc pp4iCipOjQ4/v83k/wL7M+dB89WD9kEBv4C8g2FUeiatzg/lKnEzH/64bvnzamhh106y ef/w== 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-transfer-encoding :content-language; bh=qb5d+U0Id8lIqAWfxQheAcWONeEcboJpT5+z508o/Ww=; b=iYENDc5yElHPjw4YOGF82Qg2SfN9ravFncjx0gC0p/ww89ZHuTJVcq2Lc51syH/G1o rws5ujpPSHK4QLJj4NyCsTd42pdfCJR9zmwvs+f94SSj7TSk21IVqjb6OHV2bOfA8CQr YMHyyaBzHfusBYIC630haeUMfkKIReyNCi3SqZxMn3BS/l352VpR7pcj389sna7LOK+c wp07OXWOdTsEqeYgQ0r0CRzaVPdzirska+/pCBnvSCmKPo9gV91KEUfJOh2X1vU4n1Y+ HekSh3bZG8tuLF+4EJvjR4QfH5aMIrIZi4zTBRJFj0fNZlaZ7t4nmK+QYqsQOFqhpBeg bpPw== X-Gm-Message-State: AOAM531djmFcUav1tZQxXOEN4EKJ/ofDpnkdmU3ahvOX9pBRt7Wm+wl6 LUiub79CTJBjU7K35m75zX7uZRpocHJeTw== X-Google-Smtp-Source: ABdhPJzC0pt4q7UA0ciR0y49Yot7y5oDh8kUDh16LPHavXhtDkCpQ2gTyxwhSMJ+vZZwvexZYwYg7w== X-Received: by 2002:a17:90a:9f8f:: with SMTP id o15mr1473325pjp.55.1623872467040; Wed, 16 Jun 2021 12:41:07 -0700 (PDT) Received: from ?IPv6:2001:df0:0:200c:9d12:c2c8:273e:6ffd? ([2001:df0:0:200c:9d12:c2c8:273e:6ffd]) by smtp.gmail.com with ESMTPSA id c14sm3086391pgv.86.2021.06.16.12.40.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Jun 2021 12:41:06 -0700 (PDT) Subject: Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads To: Geert Uytterhoeven , "Eric W. Biederman" Cc: Linus Torvalds , linux-arch , Jens Axboe , Oleg Nesterov , Al Viro , Linux Kernel Mailing List , Richard Henderson , Ivan Kokshaysky , Matt Turner , alpha , linux-m68k , Arnd Bergmann , Ley Foon Tan , Tejun Heo , Kees Cook References: <87sg1p30a1.fsf@disp2133> <87pmwsytb3.fsf@disp2133> <87sg1lwhvm.fsf@disp2133> <6e47eff8-d0a4-8390-1222-e975bfbf3a65@gmail.com> <924ec53c-2fd9-2e1c-bbb1-3fda49809be4@gmail.com> <87eed4v2dc.fsf@disp2133> <5929e116-fa61-b211-342a-c706dcb834ca@gmail.com> <87fsxjorgs.fsf@disp2133> From: Michael Schmitz Message-ID: <594ca040-3ad3-5cfe-2b9e-8e7804c199b5@gmail.com> Date: Thu, 17 Jun 2021 07:40:57 +1200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Geert, On 16/06/21 7:38 pm, Geert Uytterhoeven wrote: > Hi Eric, > > On Tue, Jun 15, 2021 at 9:32 PM Eric W. Biederman wrote: >> Do you happen to know if there is userspace that will run >> in qemu-system-m68k that can be used for testing? > There's a link to an image in Laurent's patch series "[PATCH 0/2] > m68k: Add Virtual M68k Machine" > https://lore.kernel.org/linux-m68k/20210323221430.3735147-1-laurent@vivier.eu/ Thanks, I'll try that one. I'll try and implement a few of the solutions Eric came up with for alpha, unless someone beats me to it (Andreas?). Cheers,     Michael > > Gr{oetje,eeting}s, > > Geert >