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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 042E2C2D0C0 for ; Sun, 22 Dec 2019 14:52:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C1A2F20665 for ; Sun, 22 Dec 2019 14:52:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="shkZTmaB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726162AbfLVOvP (ORCPT ); Sun, 22 Dec 2019 09:51:15 -0500 Received: from mail-wm1-f43.google.com ([209.85.128.43]:50690 "EHLO mail-wm1-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725903AbfLVOvP (ORCPT ); Sun, 22 Dec 2019 09:51:15 -0500 Received: by mail-wm1-f43.google.com with SMTP id a5so13415846wmb.0 for ; Sun, 22 Dec 2019 06:51:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=l2F8zCN/M8ngdZG7YujfUJxC8wgfVDGf5RsKRHlDmMg=; b=shkZTmaBXi4Fp5T38gHGZbTZZpuJ/r1jWTjkcY4iv72TmHvBgwEh+ECAA3zDX9hnta fcidzhBL5fdd5/jQRyEulx6QGupGQnb96kkUpY59c0yKYom3O6cBztEh7mBlp8olNxeh cKo4AhZ6L5ZsPVE0ov/zIV+c4nQocWAHvSlGUIDQjtF5hICcfzBXxMb2H1SKxhRaRv8M 43OKIigmgunrRuK+yKjy0px40h+bTxMXZNOZtQ0E3XIuntx8yF7H7kz87Cr2rNUSIOLj W7Bw4mke9Av4y5cuNJeODbJUtv28RwEAYpXKUzZa+NbQ5MigsdmuutBXVPCyDJwnFlSk HQ6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=l2F8zCN/M8ngdZG7YujfUJxC8wgfVDGf5RsKRHlDmMg=; b=LUB8oMnpru7K0nNImBbYdYnziWBdUo31+yJaE5enzLrTdUNAACSB/WFX5N21BLj0Ai 56gvnSScCaxKEveuVKVfc9rbTq3QkKMHCpCf8pN+iLr2qLBgyQNkvHR+0P0fqqJ11lZc xSppqLnA4hIuHuOk8NivdK0kUnxktgMArDkAUo0KAw/JsjK3MaPm+x+TB8jq5UUbgmch KVHT9zuqZ8hpoUDYP37SeStpEErL/OzT+l216tMb0pBckPnSaFSj+AZdKArv344uF38f rAJ5TCdGLab8a//Me5fnJSCVxFEXyJSxsz3DVPLs5dPoXl83V49zZ0lP328Lg7aQCaq6 TiAg== X-Gm-Message-State: APjAAAXJ0mzQv0KBRAOw1KNT4TC+n2ysj2WxTujLcR7TRQKP2pSLR0CJ cF6bW/fCn+oS1ybRAMcnFf/okK4= X-Google-Smtp-Source: APXvYqwRMWR6czeUMuXJ+VCTqYVldKYfMwN8pFNCsilWhIfiTfi9BucpZsk6c8tlxNZB2OXelojQAg== X-Received: by 2002:a1c:7715:: with SMTP id t21mr26453301wmi.149.1577026273381; Sun, 22 Dec 2019 06:51:13 -0800 (PST) Received: from avx2 ([46.53.254.212]) by smtp.gmail.com with ESMTPSA id v22sm15883818wml.11.2019.12.22.06.51.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Dec 2019 06:51:12 -0800 (PST) Date: Sun, 22 Dec 2019 17:51:10 +0300 From: Alexey Dobriyan To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH -mm 3/3] ELF, coredump: allow process with empty address space to coredump Message-ID: <20191222145110.GA895@avx2> References: <20191222144421.GC24341@avx2> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20191222144421.GC24341@avx2> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 22, 2019 at 05:44:21PM +0300, Alexey Dobriyan wrote: > Unmapping whole address space at once with > > munmap(0, (1ULL<<47) - 4096) > > or equivalent will create empty coredump. > tools/testing/selftests/exec/Makefile | 1 > tools/testing/selftests/exec/coredump-zero-vma.c | 38 +++++++++++++++++++++++ Oh, disreard this. Test should fork and wait properly.