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=-1.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 C299CC43441 for ; Sun, 18 Nov 2018 18:15:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E5DD20869 for ; Sun, 18 Nov 2018 18:15:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ErI5NExB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8E5DD20869 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727262AbeKSEgW (ORCPT ); Sun, 18 Nov 2018 23:36:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:52368 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726741AbeKSEgW (ORCPT ); Sun, 18 Nov 2018 23:36:22 -0500 Received: from mail-wm1-f53.google.com (mail-wm1-f53.google.com [209.85.128.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 30ABF20869 for ; Sun, 18 Nov 2018 18:15:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542564925; bh=yfcFrIAFT4scKWN9bupr6FohMuwkTM1qu3KEAjvYSB4=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=ErI5NExB83UB8S5rPWj9i1HtnaUHmOJTgM7/uk4gHsKEtzxLdX2DttM0QTKS3t+E7 D9j25+9DuectQI1aKJ3X2HsUcqGsR4EEyPNXqXowX6YedPlXYr9lYHxqUb93EAQ/6e rTH+QPaErdGU0QGsxxL7YB+GhIWNbrDLGGqrVoBY= Received: by mail-wm1-f53.google.com with SMTP id u13-v6so3118897wmc.4 for ; Sun, 18 Nov 2018 10:15:25 -0800 (PST) X-Gm-Message-State: AA+aEWb977eb0l4hM8K4w++Y1azX2LhEB3fALunABvDxstAwB0XXRrzd i9Zha/88Px1eiMuay7T9RMkLhmqaqPmFCU/IQ3qnMw== X-Google-Smtp-Source: AJdET5fB7uTWghIEqFHvtizOyhA4dMSedrfgfAi0gP6rJtzA4ZYHlvIPlmz5jJaYXChQ9FHEBU5vZvr3M2aBh2qpWUA= X-Received: by 2002:a7b:ce11:: with SMTP id m17mr5081690wmc.74.1542564923629; Sun, 18 Nov 2018 10:15:23 -0800 (PST) MIME-Version: 1.0 References: <20181118111751.6142-1-christian@brauner.io> <20181118174148.nvkc4ox2uorfatbm@brauner.io> In-Reply-To: From: Andy Lutomirski Date: Sun, 18 Nov 2018 10:15:11 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] proc: allow killing processes via file descriptors To: Daniel Colascione Cc: Christian Brauner , Andrew Lutomirski , "Eric W. Biederman" , LKML , "Serge E. Hallyn" , Jann Horn , Andrew Morton , Oleg Nesterov , Aleksa Sarai , Al Viro , Linux FS Devel , Linux API , Tim Murray , Kees Cook , David Howells Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 18, 2018 at 10:07 AM Daniel Colascione wrote: > Next, I want to merge my exithand proposal, or something like it. It's > likewise a simple change that, in a minimal way, addresses a > longstanding API deficiency. I'm very strongly against the > POLLERR-on-directory variant of the idea. Can you explain why you don't like POLLERR-on-a-directory? I'm not saying that POLLERR-on-a-directory is fantastic, but I'd like to understand what your objection is.