From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id D50C21F4B4 for ; Thu, 10 Sep 2020 08:32:40 +0000 (UTC) Received: from localhost ([::1]:48368 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kGI0V-0007Ow-L2 for normalperson@yhbt.net; Thu, 10 Sep 2020 04:32:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54618) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kGI0S-0007Oe-I7 for bug-gnulib@gnu.org; Thu, 10 Sep 2020 04:32:36 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:60325 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kGI0Q-0005ez-20 for bug-gnulib@gnu.org; Thu, 10 Sep 2020 04:32:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599726752; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type; bh=PpBPC5UznjHRTCEFjtrUfpP/X9pEw1ScN1EECqykN0A=; b=XKdB/MvqAy7OJof0bAp/BBGracu/g7GCq4LsfDmV/Y6i562XAPNS4WpYhQDgKX5lAJIwip qpnyBJ5Bapj+xWFNiXIqhdgK0GGIKEdtLvGrAffMjiAS0R5jxPkZXgfgby48sW5t76pax5 kaABd4W/WgIa3bz3elcefNf4lIaNJuw= 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-140-wheV7hiOPv-9XaHsw7dedw-1; Thu, 10 Sep 2020 04:32:27 -0400 X-MC-Unique: wheV7hiOPv-9XaHsw7dedw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E8A5584639C for ; Thu, 10 Sep 2020 08:32:26 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-113-142.rdu2.redhat.com [10.10.113.142]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3AABF60BF1 for ; Thu, 10 Sep 2020 08:32:25 +0000 (UTC) From: Florian Weimer To: bug-gnulib@gnu.org Subject: Undefined behavior in lib/canonicalize-lgpl.c Date: Thu, 10 Sep 2020 10:32:23 +0200 Message-ID: <87eena6nhk.fsf@oldenburg2.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 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=fweimer@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=205.139.110.120; envelope-from=fweimer@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/10 01:23:25 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: bug-gnulib@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Gnulib discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnulib-bounces+normalperson=yhbt.net@gnu.org Sender: "bug-gnulib" We have received a report that the glibc realpath implementation exhibits undefined behavior: In gnulib, the code is in lib/canonicalize-lgpl.c: 234 if (!ISSLASH (dest[-1])) 235 *dest++ = '/'; 236 237 if (dest + (end - start) >= rpath_limit) 238 { 239 ptrdiff_t dest_offset = dest - rpath; 240 char *new_rpath; 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