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=-5.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 97E56C32789 for ; Fri, 2 Nov 2018 18:46:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 69B6C2084A for ; Fri, 2 Nov 2018 18:46:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="tnQZ2b/M" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69B6C2084A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730337AbeKCDyX (ORCPT ); Fri, 2 Nov 2018 23:54:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:50278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729136AbeKCDyX (ORCPT ); Fri, 2 Nov 2018 23:54:23 -0400 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 60D1120837; Fri, 2 Nov 2018 18:46:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541184370; bh=8NRCr/cpqpw2JFL6wTeXCBn3EmyvbkLyFOFXyfS5hIk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tnQZ2b/Mj9EcJ61tGpm227mD6LZmXbpkpaCuLZwHHbl+z11njbEeOFD2T6scMOJq1 U4UxzcEfzLrZFhXlWiEo299zl78kAkC/apJgaZotpUCFfIT/1NUSbWmk84oYFRSihJ 8iFMFmovQtc3QiRYWv/z/l0j9h7V7H4AvmOJYSbY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Michael S. Tsirkin" , Josh Poimboeuf , Andrea Arcangeli , Jason Wang , "David S. Miller" Subject: [PATCH 4.18 120/150] vhost: Fix Spectre V1 vulnerability Date: Fri, 2 Nov 2018 19:34:42 +0100 Message-Id: <20181102182911.359261123@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181102182902.250560510@linuxfoundation.org> References: <20181102182902.250560510@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang [ Upstream commit ff002269a4ee9c769dbf9365acef633ebcbd6cbe ] The idx in vhost_vring_ioctl() was controlled by userspace, hence a potential exploitation of the Spectre variant 1 vulnerability. Fixing this by sanitizing idx before using it to index d->vqs. Cc: Michael S. Tsirkin Cc: Josh Poimboeuf Cc: Andrea Arcangeli Signed-off-by: Jason Wang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/vhost/vhost.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "vhost.h" @@ -1362,6 +1363,7 @@ long vhost_vring_ioctl(struct vhost_dev if (idx >= d->nvqs) return -ENOBUFS; + idx = array_index_nospec(idx, d->nvqs); vq = d->vqs[idx]; mutex_lock(&vq->mutex);