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 [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id 8E295385800B for ; Wed, 17 Nov 2021 11:07:04 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 8E295385800B Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-237-wfU5fCrxONmaA8ILqEwEkw-1; Wed, 17 Nov 2021 06:07:02 -0500 X-MC-Unique: wfU5fCrxONmaA8ILqEwEkw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0EA97801B2F for ; Wed, 17 Nov 2021 11:07:02 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.194.81]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1E23D1F459; Wed, 17 Nov 2021 11:07:00 +0000 (UTC) From: Florian Weimer To: DJ Delorie Cc: libc-alpha@sourceware.org Subject: Re: [patch v3] Allow for unpriviledged nested containers References: Date: Wed, 17 Nov 2021 12:06:58 +0100 In-Reply-To: (DJ Delorie's message of "Mon, 15 Nov 2021 18:08:11 -0500") Message-ID: <8735nv82i5.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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_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: 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: Wed, 17 Nov 2021 11:07:06 -0000 * DJ Delorie: > Subject: Allow for unpriviledged nested containers > > When running a "make check" in an untrusted podman container, we do > not have priviledges to mount a new /proc. Previously, we just failed > to initialize the container and thus all test-container tests were > "unsupported". With this change, we bind mount the parent's /proc, > which we have priviledges to do. Note that MS_REC is needed as /proc > typically has things mounted within it, and not mounting those would > be a security hole[*]. I see a new test failure with this, elf/tst-pldd. Happens with kernel-5.14.17-301.fc35.x86_64, kernel-5.14.13-100.fc33.x86_64, linux-image-5.10.0-9-amd64_5.10.70-1, as a non-root user. Thanks, Florian