From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by sourceware.org (Postfix) with ESMTP id 0BFA3384A023 for ; Mon, 18 Jan 2021 16:53:31 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 0BFA3384A023 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-448-i-WJn54XMFWmJ26m-mrxkQ-1; Mon, 18 Jan 2021 11:53:29 -0500 X-MC-Unique: i-WJn54XMFWmJ26m-mrxkQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3FF6115731 for ; Mon, 18 Jan 2021 16:53:28 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-112-110.ams2.redhat.com [10.36.112.110]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 033681821A; Mon, 18 Jan 2021 16:53:15 +0000 (UTC) From: Florian Weimer To: Carlos O'Donell via Libc-alpha Subject: Re: nsswitch: do not reload if "/" changes References: <25a79acd-f739-83ec-5dcf-ab2bd771f561@redhat.com> Date: Mon, 18 Jan 2021 17:53:11 +0100 In-Reply-To: <25a79acd-f739-83ec-5dcf-ab2bd771f561@redhat.com> (Carlos O'Donell via Libc-alpha's message of "Mon, 18 Jan 2021 10:59:17 -0500") Message-ID: <87eeiinq4o.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jan 2021 16:53:32 -0000 * Carlos O'Donell via Libc-alpha: > Can we create a non-test-container test for this? > > I think you can use support_become_root to unshare and then try > to use support_chroot_create/support_chroot_free and xhcroot to > change root, and then try to do an NSS call that will fail? You need to chroot twice, first to get a defined /etc/nsswitch.conf, and another one to make sure things don't ger reloaded after chroot. You probably also have to copy different service modules into the two chroots. Thanks, Florian -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill