From patchwork Fri Aug 11 02:37:58 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 800389 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xT8Qg01nwz9t3J for ; Fri, 11 Aug 2017 12:41:31 +1000 (AEST) Received: from localhost ([::1]:49328 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dfztA-0008F5-Uy for incoming@patchwork.ozlabs.org; Thu, 10 Aug 2017 22:41:28 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60464) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dfzq0-00068F-PB for qemu-devel@nongnu.org; Thu, 10 Aug 2017 22:38:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dfzpz-00057S-Qe for qemu-devel@nongnu.org; Thu, 10 Aug 2017 22:38:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35592) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dfzpx-00055U-A1; Thu, 10 Aug 2017 22:38:09 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 301FF1103F2; Fri, 11 Aug 2017 02:38:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 301FF1103F2 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=eblake@redhat.com Received: from red.redhat.com (ovpn-120-43.rdu2.redhat.com [10.10.120.43]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7869B8AD69; Fri, 11 Aug 2017 02:38:07 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Date: Thu, 10 Aug 2017 21:37:58 -0500 Message-Id: <20170811023759.26390-3-eblake@redhat.com> In-Reply-To: <20170811023759.26390-1-eblake@redhat.com> References: <20170811023759.26390-1-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 11 Aug 2017 02:38:08 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 2/2] HACK: define NBD_SERVER_DEBUG to force malicious server X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , vsementsov@virtuozzo.com, "open list:Network Block Dev..." Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" --- nbd/server.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/nbd/server.c b/nbd/server.c index 82a78bf439..d6fbd46370 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -919,6 +919,17 @@ static int nbd_send_reply(QIOChannel *ioc, NBDReply *reply, Error **errp) stl_be_p(buf + 4, reply->error); stq_be_p(buf + 8, reply->handle); + static int debug; + static int count; + if (!count++) { + const char *str = getenv("NBD_SERVER_DEBUG"); + if (str) { + debug = atoi(str); + } + } + if (debug && !(count % debug)) { + buf[0] = 0; + } return nbd_write(ioc, buf, sizeof(buf), errp); }