X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C86DE393A423
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1641984173;
	bh=1bJ84KU/oYsNZEztbTyrDHqTYFwQzRoX9kTtkwc/M+U=;
	h=Date:From:To:Subject:References:In-Reply-To:List-Id:
	 List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:
	 Reply-To:From;
	b=MPx/8xCyXvHPBtM8zoL4JGe4pHqL9aCl+MDpacRhwMsc7olxF8TjsGVke9xfT2k2b
	 duxH1WvIh7mrIuoDDt2TsiuifSeiT7uWFh/xIO7Kti6L7wN2HeStRBaXqzeAHD+rBr
	 ibyWaKMctiPAXkT1SD9ahmXezQufuCiiHhzv0IDI=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 316BB393A410
Authentication-Results: sourceware.org;
 dmarc=fail (p=none dis=none) header.from=cygwin.com
Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=cygwin.com
Date: Wed, 12 Jan 2022 11:41:43 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: posix_spawn issues on i686
Message-ID: <Yd6wZ0r7EXOGcQfQ@calimero.vinschen.de>
Mail-Followup-To: cygwin AT cygwin DOT com
References: <alpine DOT BSO DOT 2 DOT 21 DOT 2201101132030 DOT 11760 AT resin DOT csoft DOT net>
 <alpine DOT BSO DOT 2 DOT 21 DOT 2201111042390 DOT 11760 AT resin DOT csoft DOT net>
 <0a091366-a949-d7d0-6ad1-030ddd11c7dc AT cornell DOT edu>
MIME-Version: 1.0
Content-Disposition: inline
In-Reply-To: <0a091366-a949-d7d0-6ad1-030ddd11c7dc@cornell.edu>
X-Provags-ID: V03:K1:cZy6qT9E5L/Ug/n6r8RE7pMgeuiO5ftaDIHbENSGmObG3rAnhbW
 HsNNkoiv8zJs1g/bJ2BCTKtL/ER3+MqiOV9V+9eKz7DPuPKoiCXX4cLepk4TPFRjRR56mVP
 tf7RYtQ97N+96jhJTHdO2EHGIYKEIS+mM6ogICAkFsJOXKh32IbCEuR2C2gTH1I7H1/W6CA
 +UwDmU0nL8YvYU6fh6zvw==
X-UI-Out-Filterresults: notjunk:1;V03:K0:QCBeLjNniRc=:Rowy5y5BPS9Nd2MPwKREOt
 GfJLnTH0S5muazqLsJCxiez6yEJRwaM8CLNM2nOZza1WYpNV54kx/Tm7U2YPv5flNL9kK5VHD
 4sPxUIprNaAYjx6IuMO0DL1+6kDetwjelGNuaLS+MohHBJDEPl2TIGBfQ6ukAzoboEBec8hFr
 CNhbw/hgsNsQ3nVdLlNlZDudX3oYY6sRsAdrMQW2p+AbzcGX4XPWGIbtDSY40gNsgCYJvDuGB
 W4lMxBaro37uVpNvH1kIGfpLb6OcmllZllFNkelMIjeunU+PjZp1dOZHHtIbFpwkOSzImCgip
 0E3n70/E2EF/Dn7qCdI+lGY1mTist5f6Wgkw1QBB0b7RPyzptPHNn1CY8Zp2L6AwG0K3tO1Y0
 T7+T10l/Q4LA8zayqTRq+zoA+g5KBc+7/VYfCWdaUVyTHdS1dZyQLBdTUZSonyxV33HTsGOEc
 Hynba77J5BLHP7VTY1LF6vjL/4DVZweLcGJMz66NdQZDWAwrlNfb45ZwO1O3oEP6TwdoGgbYB
 AhJecAaezn1FvyudUQtwE4kQDNQY/IYJ4+3981XDYR9hcSOdngLZtU1Qi5HtN8bL7MefY7nlQ
 43EaxAF64mWcGxaPOkIwEAN/UePvAWcy1sZ5LVo2+RXI8z2XGR0CBnlKGol0gZNNNid2xW8Od
 bmpNAsnAqkpyL4McamVqTizaaM/G64Fvcw7Xy7KTe6qU5NeCtfqFOc6+ZlKVYYHcmBNAmo3iA
 t5fgo+kW4utmY8VY
X-Spam-Status: No, score=-93.5 required=5.0 tests=BAYES_00,
 GOOD_FROM_CORINNA_CYGWIN, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_NUMSUBJECT,
 RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL, SPF_FAIL,
 SPF_HELO_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
Reply-To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Jan 11 16:08, Ken Brown wrote:
> On 1/11/2022 1:45 PM, Jeremy Drake via Cygwin wrote:
> > Sorry, I am not subscribed to the list so don't have the message to reply
> > to for threading purposes, but attached please find a C reproducer that
> > works on x86_64 but fails on i686.  The particular issue seems to be the
> > POSIX_SPAWN_RESETIDS flag - not setting that allows i686 to succeed too.

Thanks for the STC, Jeremy!

> I don't have time to check this carefully, but it looks to me like the
> problem is that process_spawnattr calls setegid and seteuid instead of
> setegid32 and seteuid32.  This causes truncation of the gid and uid.

You're right.  Additionally the calls to getgid and getuid have to use
the internal getgid32 and getuid32 functions.

I'll apply a fix.


Thanks guys!
Corinna

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple