From patchwork Thu Sep 28 13:19:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 1840826 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=RWvuccQB; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RxDlT2GxYz1ypN for ; Thu, 28 Sep 2023 23:26:29 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qlqwq-0003gy-22; Thu, 28 Sep 2023 09:20:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qlqwS-0003TU-OB for qemu-devel@nongnu.org; Thu, 28 Sep 2023 09:20:34 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qlqwM-0008An-E5 for qemu-devel@nongnu.org; Thu, 28 Sep 2023 09:20:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695907225; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ON7IO5ivCVC9AGVzZpLWa3v/90xMndv3sSh0NL3cuGg=; b=RWvuccQB0vq7/htmRGM7zNh7GkuZU1Bi/bwAw7OLiMYjaAz6sB1+L7XoTVV+DmuPMOMxVr T7LTx4rcFFvuFjnaITOYJbGI/Nlao9SCjJVxwQkWwb8vQQOG4NleysF6OTEetA+654PsX9 JHFcPiFWZmBXDBVttRB68CVIcA5aV6k= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-292-1nikscxFP7G4Wmu7KTTbzw-1; Thu, 28 Sep 2023 09:20:22 -0400 X-MC-Unique: 1nikscxFP7G4Wmu7KTTbzw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0CC59280A9CB; Thu, 28 Sep 2023 13:20:22 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DE31114171B6; Thu, 28 Sep 2023 13:20:21 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id D1CB021E690E; Thu, 28 Sep 2023 15:20:19 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Cc: quintela@redhat.com, peterx@redhat.com, leobras@redhat.com, farosas@suse.de, lizhijian@fujitsu.com, eblake@redhat.com Subject: [PATCH v2 06/53] migration/rdma: Fix unwanted integer truncation Date: Thu, 28 Sep 2023 15:19:32 +0200 Message-ID: <20230928132019.2544702-7-armbru@redhat.com> In-Reply-To: <20230928132019.2544702-1-armbru@redhat.com> References: <20230928132019.2544702-1-armbru@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org qio_channel_rdma_readv() assigns the size_t value of qemu_rdma_fill() to an int variable before it adds it to @done / subtracts it from @want, both size_t. Truncation when qemu_rdma_fill() copies more than INT_MAX bytes. Seems vanishingly unlikely, but needs fixing all the same. Fixes: 6ddd2d76ca6f (migration: convert RDMA to use QIOChannel interface) Signed-off-by: Markus Armbruster Reviewed-by: Fabiano Rosas Reviewed-by: Juan Quintela Reviewed-by: Li Zhijian --- migration/rdma.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/migration/rdma.c b/migration/rdma.c index 4289346617..5f423f66f0 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -2852,7 +2852,7 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, RDMAControlHeader head; int ret = 0; ssize_t i; - size_t done = 0; + size_t done = 0, len; RCU_READ_LOCK_GUARD(); rdma = qatomic_rcu_read(&rioc->rdmain); @@ -2873,9 +2873,9 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, * were given and dish out the bytes until we run * out of bytes. */ - ret = qemu_rdma_fill(rdma, data, want, 0); - done += ret; - want -= ret; + len = qemu_rdma_fill(rdma, data, want, 0); + done += len; + want -= len; /* Got what we needed, so go to next iovec */ if (want == 0) { continue; @@ -2902,9 +2902,9 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, /* * SEND was received with new bytes, now try again. */ - ret = qemu_rdma_fill(rdma, data, want, 0); - done += ret; - want -= ret; + len = qemu_rdma_fill(rdma, data, want, 0); + done += len; + want -= len; /* Still didn't get enough, so lets just return */ if (want) {