From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/1240 Path: news.gmane.org!not-for-mail From: Rich Felker Newsgroups: gmane.linux.lib.musl.general Subject: Re: openssh and sendmsg() problem Date: Tue, 26 Jun 2012 13:32:05 -0400 Message-ID: <20120626173205.GK544@brightrain.aerifal.cx> References: <20120626190146.1c086ed2@sibserver.ru> <20120626120017.GZ17860@port70.net> <20120626160106.GJ544@brightrain.aerifal.cx> <20120627012441.2af9b154@sibserver.ru> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1340732052 790 80.91.229.3 (26 Jun 2012 17:34:12 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 26 Jun 2012 17:34:12 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-1241-gllmg-musl=m.gmane.org@lists.openwall.com Tue Jun 26 19:34:12 2012 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1SjZeV-0002wY-Nx for gllmg-musl@plane.gmane.org; Tue, 26 Jun 2012 19:34:11 +0200 Original-Received: (qmail 11458 invoked by uid 550); 26 Jun 2012 17:34:11 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 11450 invoked from network); 26 Jun 2012 17:34:11 -0000 Content-Disposition: inline In-Reply-To: <20120627012441.2af9b154@sibserver.ru> User-Agent: Mutt/1.5.21 (2010-09-15) Xref: news.gmane.org gmane.linux.lib.musl.general:1240 Archived-At: On Wed, Jun 27, 2012 at 01:24:41AM +0800, orc wrote: > On Tue, 26 Jun 2012 12:01:06 -0400 > Rich Felker wrote: > > > On Tue, Jun 26, 2012 at 02:00:17PM +0200, Szabolcs Nagy wrote: > > > * orc [2012-06-26 19:01:46 +0800]: > > > > strace shows that sendmsg system call returns EINVAL: > > > > > > > > sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], > > > > msg_controllen=24, {cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_ > > > > type=SCM_RIGHTS, {4, 385875968}}, msg_flags=0}, 0) = -1 EINVAL > > > > (Invalid argument) > > > > > > > > > > src/network/sendmsg.c has an ifdef for long>int case > > > > > > i don't know what it's supposed to do > > > > It's there because the kernel expects certain fields to be long but > > POSIX requires them to be int. Thus the syscall wrapper has to copy > > the userspace struct (with int and padding) to a kernel-format struct > > (with the padding filled with 0's so it's a valid long). > > And how to deal with this? Should it be openssh workaround or fix in > musl itself? There's nothing to be dealt with here; musl already works around the kernel bug. Something is wrong, possibly in this code or elsewhere, but I don't know what and I don't see anything obviously wrong with the syscall. Can you compare the strace to what happens on glibc? Rich