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=-5.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 CE401C49361 for ; Wed, 16 Jun 2021 09:36:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B34C56128B for ; Wed, 16 Jun 2021 09:36:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232296AbhFPJit (ORCPT ); Wed, 16 Jun 2021 05:38:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:58928 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231468AbhFPJit (ORCPT ); Wed, 16 Jun 2021 05:38:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BF660611CA; Wed, 16 Jun 2021 09:36:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623836203; bh=wcGDK91fFPepIq/awj42YrO7KjdXSTwdbqT1it3WO7g=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ygZBfnSK533BPLAcGjAcewpnzqWMFx2cpxGJtUSi+rRvzjhyj9ODNuVa/97PFyeZe fXBq8nCu7AwuuzcXHgjrGgQNstqAOnxHIluFm6P8gJtAwaS54nEwAt0Q3zvGkVOqeP EIloSppAwnRg73RyiisDWxnPZaNxCS11/cSK3/v8= Date: Wed, 16 Jun 2021 11:36:41 +0200 From: Greg Kroah-Hartman To: Liu Shixin Cc: Suren Baghdasaryan , Vlastimil Babka , stable@vger.kernel.org, "Jann Horn," , Mikulas Patocka Subject: Re: Questions about backports of fixes for "CoW after fork() issue" Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Wed, Jun 16, 2021 at 05:28:54PM +0800, Liu Shixin wrote: > On 2021/6/16 15:11, Suren Baghdasaryan wrote: > > On Tue, Jun 15, 2021 at 11:52 PM Greg Kroah-Hartman > > wrote: > >> On Wed, Jun 16, 2021 at 02:47:15PM +0800, Liu Shixin wrote: > >>> Hi, Suren, > >>> > >>> I read the previous discussion about fixing CVE-2020-29374 in stable 4.14 and 4.19 in > >>> > >>> > >>> https://lore.kernel.org/linux-mm/20210401181741.168763-1-surenb@google.com/ > >>> > >>> And the results of the discussion is that you backports of 17839856fd58 for 4.14 and > >>> > >>> 4.19 kernels. > >>> > >>> But the bug about dax and strace in the discussion has not been solved, right? I don't > >>> > >>> find a conclusion on this issue, am I missing something? Does this problem still exist in > >>> > >>> the stable 4.14 and 4.19 kernel? > > That is my understanding after discussions with Andrea but I did not > > verify that myself. As Greg pointed out, the best way would be to try > > it out. > > Thanks, > > Suren. > > > >> As the code is all there for you, can you just test them and see for > >> yourself? > >> > >> thanks, > >> > >> greg k-h > > . > > > Thank you both for replies. I have tested it in stable 4.19 kernel and the bug is existed as expected. Great, can you provide a working backport of the patches needed to solve this for 4.19 so that we can apply them? thanks, greg k-h