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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 60520C43381 for ; Sat, 30 Mar 2019 16:19:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 227672184D for ; Sat, 30 Mar 2019 16:19:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=brauner.io header.i=@brauner.io header.b="M0NtndlD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730980AbfC3QTl (ORCPT ); Sat, 30 Mar 2019 12:19:41 -0400 Received: from mail-ed1-f65.google.com ([209.85.208.65]:42691 "EHLO mail-ed1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730841AbfC3QTk (ORCPT ); Sat, 30 Mar 2019 12:19:40 -0400 Received: by mail-ed1-f65.google.com with SMTP id x61so4546661edc.9 for ; Sat, 30 Mar 2019 09:19:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brauner.io; s=google; h=date:user-agent:in-reply-to:references:mime-version :content-transfer-encoding:subject:to:cc:from:message-id; bh=ernJGglIMT4+VghNiZOzqrUEB85/gc2EJjQrVTUa6Ug=; b=M0NtndlDoTUOJViHHBJbfpgMzMvYz5SEH0W6ZXovwpdV0L+TO3vgAJWxxFr6E9+wTh D2fCDASHQFVeyPnEKhcu2umRxOiAJ4RlU9HbHMjerwLIbq+xkUd0UNvta2dxn2n7GrHa YthXtZfCS2gWlzCN6CiJs1V+ylGXgCQofGZNyg323N0BmPkpgHb0Sb/Xd5CNENtQlQAq Cz8tfmxA83hycB2B9bLZ+urPGstPD0NioznekJFbrVKhvJLOpGFr1cxKyzfFIMuWt+6d jmb3YCuxpcQBpTnDarOU4yqj074CtSQ5AxVm+K3fqL90JZ9vIpFjdHldmYCQBKNGwe+8 CyrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:user-agent:in-reply-to:references :mime-version:content-transfer-encoding:subject:to:cc:from :message-id; bh=ernJGglIMT4+VghNiZOzqrUEB85/gc2EJjQrVTUa6Ug=; b=PAinNB0Eulc+a4zbObWEh75/1BD57SuRSpl0OF8xF9kcTShGfpoK5gv3mACbn4sbUo clqz1l+qecTkUgIaA7qdPXwM00t7PL8mmpGHdT/OyZWyc7a/Q/NgfX7lfF41r8keCaID cP+uBW8Ppji1IvM+7dEwpyB8+qLGCJd2imtCjXEFhNkypgPN4OFlpMU/zfZXIUQb0y9D EA5AnAsCeMFO/mPrBkXQLxm3aehxm3R9Qe4nl/ZAslfTj/1epcfW3lt4Y6xuZ5xo5Z84 E557fnA+eqqQhpmcd4voVsF8+SuX+B5KEQatob4+8H81wbbpYIL0/DwzqsnrRNBpGPA4 1bbg== X-Gm-Message-State: APjAAAXuRdT5XYP3U0cs0/ys7DMiF7zhOTby+uTDbEqgatxT+P4wzl8h FZ3GHXjzrVgL8qsls/NpQOeipg== X-Google-Smtp-Source: APXvYqyX/nwunVfbVClNk8z7HdetZwIknjz59k0jQ/A/XOzEZh7T0hl0/bufWzzq8fEyCnfa5BtDXA== X-Received: by 2002:a50:8561:: with SMTP id 88mr21150275edr.101.1553962778713; Sat, 30 Mar 2019 09:19:38 -0700 (PDT) Received: from [10.38.1.125] (x59cc8b7d.dyn.telefonica.de. [89.204.139.125]) by smtp.gmail.com with ESMTPSA id n3sm916383ejc.32.2019.03.30.09.19.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 30 Mar 2019 09:19:38 -0700 (PDT) Date: Sat, 30 Mar 2019 17:19:32 +0100 User-Agent: K-9 Mail for Android In-Reply-To: References: <20190329155425.26059-1-christian@brauner.io> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v2 0/5] pid: add pidfd_open() To: Linus Torvalds CC: Jann Horn , Andrew Lutomirski , David Howells , serge@hallyn.com, Linux API , Linux List Kernel Mailing , Arnd Bergmann , "Eric W. Biederman" , Konstantin Khlebnikov , Kees Cook , Alexey Dobriyan , Thomas Gleixner , Michael Kerrisk-manpages , bl0pbl33p@gmail.com, "Dmitry V. Levin" , Andrew Morton , Oleg Nesterov , nagarathnam.muthusamy@oracle.com, Aleksa Sarai , Al Viro , Joel Fernandes , dancol@google.com From: Christian Brauner Message-ID: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On March 30, 2019 5:09:10 PM GMT+01:00, Linus Torvalds wrote: >On Fri, Mar 29, 2019 at 8:54 AM Christian Brauner > wrote: >> >> /* Introduction */ >> This adds the pidfd_open() syscall=2E >> pidfd_open() allows to retrieve file descriptors for a given pid=2E >This >> includes both file descriptors for processes and file descriptors for >> threads=2E > >I'm ok with the pidfd_open() call to just get a pidfd, but that From=20pure API perspective that's all I care about: independence of procfs= =2E Once we have pidfd_open() we can cleanly signal threads etc=2E >"pidfd_to_profs()" needs to go away=2E > >If you want to open the /proc//status file, then just do that=2E >This whole "do one and convert to the other" needs to die=2E No, no, no= =2E > > Linus