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=-6.1 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 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 EAA80C47096 for ; Thu, 3 Jun 2021 18:36:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CDEFE613F1 for ; Thu, 3 Jun 2021 18:36:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229823AbhFCSi1 (ORCPT ); Thu, 3 Jun 2021 14:38:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:51896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229576AbhFCSi1 (ORCPT ); Thu, 3 Jun 2021 14:38:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2197B613D7; Thu, 3 Jun 2021 18:36:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622745402; bh=FwhSCnFU0UJW2nRbWaqzvrhP+56z8E67kW2nPD73Yz0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=PCSfGVR5MIP2734dt3tsc1wkIpv2avXJCGZ7wQkCN/71MeuQSzy/scHwUgS5DRlhe bQbqrfnM3K/bv3Ohh+kgKdHnYWVIZ+i+Q0bWAAH4myZ0Ha+ExXYzmF3bHUKQKT/m1v /gVyZhATL/V+i694vAdzjvfHnwR/jys1fXM3sSYY= Date: Thu, 3 Jun 2021 20:36:40 +0200 From: Greg KH To: SyzScope Cc: syzbot , davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: KASAN: use-after-free Read in hci_chan_del Message-ID: References: <000000000000adea7f05abeb19cf@google.com> <2fb47714-551c-f44b-efe2-c6708749d03f@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org On Thu, Jun 03, 2021 at 11:30:08AM -0700, SyzScope wrote: > Hi developers, > > Besides the control flow hijacking primitive we sent before, we managed to > discover an additional double free primitive in this bug, making this bug > even more dangerous. > > We created a web page with detailed descriptions: https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_chan_del > > We understand that creating a patch can be time-consuming and there is > probably a long list of bugs pending fixes. We hope that our security > analysis can enable an informed decision on which bugs to fix first > (prioritization). > > Since the bug has been on syzbot for over ten months (first found on > 08-03-2020 and still can be triggered on 05-08-2021), it is best to have the > bug fixed early enough to avoid it being weaponized. Wonderful, please help out by sending a fix for this. thanks, greg k-h