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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 639DCC4646D for ; Wed, 8 Aug 2018 16:45:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 283C421A32 for ; Wed, 8 Aug 2018 16:45:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 283C421A32 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=davemloft.net 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 S1728382AbeHHTFy (ORCPT ); Wed, 8 Aug 2018 15:05:54 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:39502 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727069AbeHHTFy (ORCPT ); Wed, 8 Aug 2018 15:05:54 -0400 Received: from localhost (c-24-20-22-31.hsd1.or.comcast.net [24.20.22.31]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 7ED85140B6C72; Wed, 8 Aug 2018 09:45:23 -0700 (PDT) Date: Wed, 08 Aug 2018 09:45:21 -0700 (PDT) Message-Id: <20180808.094521.741471461713200.davem@davemloft.net> To: jasowang@redhat.com Cc: mst@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net] vhost: reset metadata cache when initializing new IOTLB From: David Miller In-Reply-To: <1533699784-4950-1-git-send-email-jasowang@redhat.com> References: <1533699784-4950-1-git-send-email-jasowang@redhat.com> X-Mailer: Mew version 6.7 on Emacs 26 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Wed, 08 Aug 2018 09:45:23 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jason Wang Date: Wed, 8 Aug 2018 11:43:04 +0800 > We need to reset metadata cache during new IOTLB initialization, > otherwise the stale pointers to previous IOTLB may be still accessed > which will lead a use after free. > > Reported-by: syzbot+c51e6736a1bf614b3272@syzkaller.appspotmail.com > Fixes: f88949138058 ("vhost: introduce O(1) vq metadata cache") > Signed-off-by: Jason Wang Applied and queued up for -stable, thanks Jason.