From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E45CDC433DF for ; Tue, 20 Oct 2020 11:37:22 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 26CE120882 for ; Tue, 20 Oct 2020 11:37:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EdFhj0Q/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 26CE120882 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44178 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kUpxA-0004mF-WB for qemu-devel@archiver.kernel.org; Tue, 20 Oct 2020 07:37:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56122) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kUpvi-0003hu-8G for qemu-devel@nongnu.org; Tue, 20 Oct 2020 07:35:50 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:50078) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kUpvg-0002c8-K5 for qemu-devel@nongnu.org; Tue, 20 Oct 2020 07:35:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603193746; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=BTzXNG+eCv3k0kW90rLo6xeV82O4F6s43EFe6HQMVS0=; b=EdFhj0Q/sWbZXbvGyQ+n04NjYVXPwL9apL4OOpkqwjL3PnzHjTG5sCLfrmMBhqYOJTP+wJ f+JOWKgDpcehWvdX8Cx/8R8gDMx5LIA1/6U6v2Mn+jkX47lLdA9yosdczusfjsBOyRiQNF dWm8yv0mBXzrBeMwLCznXQsDHoak/HI= 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-560--Gjp4Xe7OQy4nR7YXE5bDQ-1; Tue, 20 Oct 2020 07:35:44 -0400 X-MC-Unique: -Gjp4Xe7OQy4nR7YXE5bDQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B5BAB57053 for ; Tue, 20 Oct 2020 11:35:43 +0000 (UTC) Received: from work-vm (ovpn-113-116.ams2.redhat.com [10.36.113.116]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2C2DA6266E; Tue, 20 Oct 2020 11:35:32 +0000 (UTC) Date: Tue, 20 Oct 2020 12:35:30 +0100 From: "Dr. David Alan Gilbert" To: Stefan Hajnoczi Subject: Re: [PATCH v3 5/5] tools/virtiofsd: xattr name mappings: Simple 'map' Message-ID: <20201020113530.GC2962@work-vm> References: <20201014180209.49299-1-dgilbert@redhat.com> <20201014180209.49299-6-dgilbert@redhat.com> <20201020100922.GF140014@stefanha-x1.localdomain> MIME-Version: 1.0 In-Reply-To: <20201020100922.GF140014@stefanha-x1.localdomain> User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/20 01:15:43 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dinechin@redhat.com, virtio-fs@redhat.com, qemu-devel@nongnu.org, vgoyal@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Stefan Hajnoczi (stefanha@redhat.com) wrote: > On Wed, Oct 14, 2020 at 07:02:09PM +0100, Dr. David Alan Gilbert (git) wrote: > > +static XattrMapEntry *parse_xattrmap_map(const char *rule, > > + XattrMapEntry *map, > > + size_t *nentries) > > +{ > > + char sep = *rule++; > > + const char *tmp; > > + char *key; > > + char *prefix; > > + XattrMapEntry tmp_entry; > > + > > + /* At start of 'key' field */ > > + tmp = strchr(rule, sep); > > Missing sep == '\0' check. The strchr(3) man page says: > > The terminating null byte is considered part of the string, so that if > c is specified as '\0', these functions return a pointer to the > terminator. > > So the code in this patch will eventually access beyond the end of the > string: > > rule = tmp + 1; <-- tmp is already at the NUL terminator Ah yes, I've got the check in the main routine but not in the _map case; OK I'll fix that up. Dave -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK