X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 4B504389AC74
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1641986733;
	bh=TI2DTmzjDgif15r+1inxAJWnwzcjiiRBn8z99xkA0Vk=;
	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=x+iUKkKvMh1S/jQeVoUMY/orkqNlNWW431pbxhw/pGK7i00ugN6eTO2YecdAsjmDR
	9P7gMGP0hl/IAYueyety8+nrWqwIm1JIg6UwcEOn86934o5dpQHagdJvUks3RMOlC4
	SgD4ESAwyWKnvYZ6epKHatxEkQMigmECH7h3acrs=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.1 sourceware.org A4DC03858416
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 12:24:21 +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:	<Yd66ZZ3kEecT0KTc@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>
	<Yd6wZ0r7EXOGcQfQ AT calimero DOT vinschen DOT de>
MIME-Version:	1.0
In-Reply-To:	<Yd6wZ0r7EXOGcQfQ@calimero.vinschen.de>
X-Provags-ID:	V03:K1:AARHww8L6Jcvmvevd1X9qEIhSwvdnuZsptGk1G3rkeXSyM+4Ja+
	Ixs96yuuQrjuB1TYu+Rc63Z8D6bRQvTdAHSX5h4x1VREnLO1FU7ONfCdS5Ne3vCNvSw2v35
	KQdK8qFW06QoSE3gE5rSZUwt7p0Ts5RrKj73TjIjZUwPDSopT2Lh9cQSHwh+21Zg/DM+EQP
	GSCpSJATIB8p6KgxHF9sw==
X-UI-Out-Filterresults:	notjunk:1;V03:K0:sk9tMCw4zgU=:QYupukvy65wV4TYfFTPpy1
	CYjQTLo6zC/lbCi2wTE+Ccb+NT2GWcJmOBxGobKpIF0EllGSY0azEmrMXdxJXMpCdc2M0zv0G
	xpaqL23n6wsYqvdjh9Rg/3T9VbbZB7Q+RC3HDmMeKPPA7usw4Ogaz0uFAhtRsA1sNCLbmECai
	WUbRwH2699/4UjVvnhBLC/JemoMar5sQ3JMEWC1tMTBQihIe3uMRirbFp4WLBjaxEGx6gIHcR
	8CFqmGXVwPzinlq6MW0KCYCrBzmwOEfvYAt0CYVPhTikhR+ecitDIDEMwqFWj5+IyroEPwCxo
	Oheu/pUTv41BAdZC4munB6R5XrR0I2OeD1ZuPya81nmhZ9Pa26sFsr2VudbS5g3o8sniU/wSd
	0e60ck5ACTeHh5y66frPFFVzogXa040DabQobX3A0ke+yhQRmotIfQ9diSIor3H2/TauxYMq+
	qJMG6dKEKpfmPoGV7VvPXy/Wn7+EMST6vhd9nptOteqx7AQgaMbKCghyqOqqjJoiFqTQhbg3d
	DHrF51F8HExxAdcQ10lt3+nUtPIRzSKTgKQRl7Oqa4ahQbt9v6DC6ko4SAeRkMURkRe9rFwS3
	cr/gBy4Ojgbd8jXQaFZkPgmTn5+jfoYa1ART48AYlfQeckETctf7yJJcvdkwWRXWz5rS2cdmq
	nUc0R0PIdXSzDE8egpcwJeSvnH0TvQqEvC1z84iMZldr465v7Fzlv6CrlUvozCnWZWHd/IGGD
	A27gN9BmSGaCxOmx
X-Spam-Status:	No, score=-93.8 required=5.0 tests=BAYES_00,
	GOOD_FROM_CORINNA_CYGWIN, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_NUMSUBJECT,
	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
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
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 12 11:41, Corinna Vinschen wrote:
> 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.

New developer snapshot is up at https://cygwin.com/snapshots/
Please test.


Thanks,
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

- Raw text -