Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753335AbcCRWce (ORCPT ); Fri, 18 Mar 2016 18:32:34 -0400 Received: from shards.monkeyblade.net ([149.20.54.216]:55642 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751490AbcCRWcb (ORCPT ); Fri, 18 Mar 2016 18:32:31 -0400 Date: Fri, 18 Mar 2016 18:32:30 -0400 (EDT) Message-Id: <20160318.183230.1601751551897264970.davem@davemloft.net> To: glider@google.com Cc: edumazet@google.com, rweikusat@mobileactivedefense.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH] af_unix: closed SOCK_SEQPACKET socketpair must get SIGPIPE From: David Miller In-Reply-To: <1458032624-139688-1-git-send-email-glider@google.com> References: <1458032624-139688-1-git-send-email-glider@google.com> X-Mailer: Mew version 6.7 on Emacs 24.5 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 18 Mar 2016 15:32:31 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 593 Lines: 17 From: Alexander Potapenko Date: Tue, 15 Mar 2016 10:03:44 +0100 > According to IEEE Std 1003.1, 2013, sending data to a SOCK_SEQPACKET > socketpair with MSG_NOSIGNAL flag set must result in a SIGPIPE if the > socket is no longer connected. > > I used the following program to check the kernel behavior: ... > Signed-off-by: Alexander Potapenko In the final analysis I don't think we can do this. Properly working programs will start to mysteriously receive signals in this situation and fail. I'm sorry but I think we're stuck with this behavior.