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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 43A32C48BC2 for ; Mon, 21 Jun 2021 23:16:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 288BF6102A for ; Mon, 21 Jun 2021 23:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231373AbhFUXSO (ORCPT ); Mon, 21 Jun 2021 19:18:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230464AbhFUXSL (ORCPT ); Mon, 21 Jun 2021 19:18:11 -0400 Received: from mail-lj1-x236.google.com (mail-lj1-x236.google.com [IPv6:2a00:1450:4864:20::236]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81B04C06175F for ; Mon, 21 Jun 2021 16:15:56 -0700 (PDT) Received: by mail-lj1-x236.google.com with SMTP id u11so16546917ljh.2 for ; Mon, 21 Jun 2021 16:15:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=stNy8kLF5vctj8WXK363X+Ab+aWkvJsrhuAKRgNlaFY=; b=IL1c66HdRAXSPTueb6HvT7WAQ+hVTgraIpPVGrRtYIIPrdMk6idOyB+d7hgkhCbE/J WSDn2K6/KFlAr4ZepO/VZSbAHdCjsBoc9mInrjOrnW0t0J2Sklo0eRJQKmRh1FXkY2rP httftVRSDPt4omCrZhGPE4bzB66yBCzHc25jk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=stNy8kLF5vctj8WXK363X+Ab+aWkvJsrhuAKRgNlaFY=; b=cArIQ+MQdzEoTIW/33mGSO+k7dZd+iih3om1/t6TyxH5dP9/YS6h2x/QeTvYbndEdR b/OE9iZ4WHXr5ZHn1MLH2pgQUrLdaCFzyBwXIcv9ytoifT7fl2V4m3MgXCXuUawP+5lX /eom2N8J8IA21DgiDEi4pewaTcB0NnattmAheWt2kzHq+hNTlyEAcawEog/74bawcXAY g6hqoLJ2ajZgYRnWlasX/Y4rg6ms9doHn9ysRJBtmk662A0aMoyd7fdutUP10c0Olg+M X8A7h9pRxqo2w/HzXnTPzzzsWsGiiLako6RtAl13yUFw3PKduhx4m9dru2zLfJBvMDEG nkgQ== X-Gm-Message-State: AOAM531pkQ0XRLjYe/Ioxrws1PNzISFvxQi+RKvXTpAn6i30WZ8Bgz8y 1WWrLljOjS7Rfsc79I4dSdjvMZjMc/mtH6Wpfnw= X-Google-Smtp-Source: ABdhPJzJaTf3CACuiskA7/lWLRPL/y9FOVdAIfQ6+7adN078PIy0IgI8N2VUDXs/FsBb4i0ZEMitNA== X-Received: by 2002:a2e:9d4c:: with SMTP id y12mr535052ljj.80.1624317354790; Mon, 21 Jun 2021 16:15:54 -0700 (PDT) Received: from mail-lf1-f47.google.com (mail-lf1-f47.google.com. [209.85.167.47]) by smtp.gmail.com with ESMTPSA id q16sm2008025lfu.103.2021.06.21.16.15.53 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Jun 2021 16:15:53 -0700 (PDT) Received: by mail-lf1-f47.google.com with SMTP id p7so32702906lfg.4 for ; Mon, 21 Jun 2021 16:15:53 -0700 (PDT) X-Received: by 2002:a05:6512:15a2:: with SMTP id bp34mr498972lfb.40.1624317352941; Mon, 21 Jun 2021 16:15:52 -0700 (PDT) MIME-Version: 1.0 References: <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> <87a6njf0ia.fsf@disp2133> In-Reply-To: <87a6njf0ia.fsf@disp2133> From: Linus Torvalds Date: Mon, 21 Jun 2021 16:15:37 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads To: "Eric W. Biederman" Cc: Al Viro , Michael Schmitz , linux-arch , Jens Axboe , Oleg Nesterov , Linux Kernel Mailing List , Richard Henderson , Ivan Kokshaysky , Matt Turner , alpha , Geert Uytterhoeven , linux-m68k , Arnd Bergmann , Ley Foon Tan , Tejun Heo , Kees Cook Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 21, 2021 at 1:04 PM Eric W. Biederman wrote: > > For other ptrace_event calls I am playing with seeing if I can split > them in two. Like sending a signal. So that we can have perform all > of the work in get_signal. That sounds like the right model, but I don't think it works. Particularly not for exit(). The second phase will never happen. Linus