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=-3.8 required=3.0 tests=BAYES_00, 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 92B7EC433DB for ; Sat, 20 Feb 2021 22:30:19 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1A53664E67 for ; Sat, 20 Feb 2021 22:30:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1A53664E67 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sandelman.ca Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4DjjnP24hSz30QB for ; Sun, 21 Feb 2021 09:30:17 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sandelman.ca (client-ip=2607:f0b0:f:3:216:3eff:fe7c:d1f3; helo=tuna.sandelman.ca; envelope-from=mcr@sandelman.ca; receiver=) Received: from tuna.sandelman.ca (tuna.sandelman.ca [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Djjn00S0Zz30L4 for ; Sun, 21 Feb 2021 09:29:55 +1100 (AEDT) Received: from localhost (localhost [127.0.0.1]) by tuna.sandelman.ca (Postfix) with ESMTP id A6249389FF for ; Sat, 20 Feb 2021 17:33:37 -0500 (EST) Received: from tuna.sandelman.ca ([127.0.0.1]) by localhost (localhost [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 7XlJUydOuHta for ; Sat, 20 Feb 2021 17:33:36 -0500 (EST) Received: from sandelman.ca (obiwan.sandelman.ca [IPv6:2607:f0b0:f:2::247]) by tuna.sandelman.ca (Postfix) with ESMTP id 8E52B3899C for ; Sat, 20 Feb 2021 17:33:36 -0500 (EST) Received: from localhost (localhost [IPv6:::1]) by sandelman.ca (Postfix) with ESMTP id 556FC50 for ; Sat, 20 Feb 2021 17:29:39 -0500 (EST) From: Michael Richardson To: "openbmc\@lists.ozlabs.org" Subject: Re: overlayFS security concern In-Reply-To: References: <3803c1a3-bee8-4e78-a23f-7e50858eda1a@beta.fastmail.com> X-Mailer: MH-E 8.6+git; nmh 1.7+dev; GNU Emacs 26.1 X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Sender: "openbmc" --=-=-= Content-Type: text/plain Patrick Williams wrote: > A protection we could do which would make attacks slightly harder than > they are today would be to change how we mount OverlayFS. Right now we > mount it on top of root, but we could be more explicit about mounting I was going to ask about that. Could we just overlay less? The second question is: would a non-persistent overlay be useful? -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | IoT architect [ ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [ --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEbsyLEzg/qUTA43uogItw+93Q3WUFAmAxjVIACgkQgItw+93Q 3WV+MAgAj4ZycdCwm5kk5WNaHa95bLl807uFmREkz9HO2cSZufLlbCPfWUxBAIUn SFVgFJJS5m6tTepadr/1EfST6qGtRKagZKBgyp8XwTTwkZJVAytmQuUr0hgMyRQU 18SLJVp977U5NU0AqJzDK+bssnkw5geYDGoE/0Bgy4ulHE7IUTu4ODqLJe44VRYY nhW8Uqgfh9ToyIJ3kvC0zW2J8d8CiiNp0pfq0dG5V3iowZfa7Fl/JkJFQYJBjKS8 u8nNZ0/jNcdQ3KhlAIlbm/qy4NA8rtuMI5hM+LIM2dTZppMGTRcGxzJw/hd6dlr3 TTVOaBHlBZP8x6LqQjYH5M3WQk0U7w== =Djm0 -----END PGP SIGNATURE----- --=-=-=--