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=-6.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 3134EC2BBD0 for ; Sat, 5 Sep 2020 19:05:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E30752078D for ; Sat, 5 Sep 2020 19:05:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728491AbgIETFn (ORCPT ); Sat, 5 Sep 2020 15:05:43 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:46646 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728397AbgIETFm (ORCPT ); Sat, 5 Sep 2020 15:05:42 -0400 Received: from static-50-53-58-29.bvtn.or.frontiernet.net ([50.53.58.29] helo=[192.168.192.153]) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1kEdVE-0007OA-BA; Sat, 05 Sep 2020 19:05:32 +0000 Subject: Re: [PATCH v20 05/23] net: Prepare UDS for security module stacking To: Casey Schaufler , Paul Moore Cc: casey.schaufler@intel.com, James Morris , linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-audit@redhat.com, keescook@chromium.org, penguin-kernel@i-love.sakura.ne.jp, Stephen Smalley References: <20200826145247.10029-1-casey@schaufler-ca.com> <20200826145247.10029-6-casey@schaufler-ca.com> <1eeef766-405f-3800-c0cf-3eb008f9673e@schaufler-ca.com> <585600d7-70fb-0982-1e6b-ffd7b7c33e32@schaufler-ca.com> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= 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List-ID: On 9/5/20 11:13 AM, Casey Schaufler wrote: > On 9/5/2020 6:25 AM, Paul Moore wrote: >> On Fri, Sep 4, 2020 at 7:58 PM Casey Schaufler wrote: >>> On 9/4/2020 2:53 PM, Paul Moore wrote: >>>> On Fri, Sep 4, 2020 at 5:35 PM Casey Schaufler wrote: >>>>> On 9/4/2020 1:08 PM, Paul Moore wrote: >> ... >> >>>> I understand the concerns you mention, they are all valid as far as >>>> I'm concerned, but I think we are going to get burned by this code as >>>> it currently stands. >>> Yes, I can see that. We're getting burned by the non-extensibility >>> of secids. It will take someone smarter than me to figure out how to >>> fit N secids into 32bits without danger of either failure or memory >>> allocation. >> Sooo what are the next steps here? It sounds like there is some >> agreement that the currently proposed unix_skb_params approach is a >> problem, but it also sounds like you just want to merge it anyway? > > There are real problems with all the approaches. This is by far the > least invasive of the lot. If this is acceptable for now I will commit > to including the dynamic allocation version in the full stacking > (e.g. Smack + SELinux) stage. If it isn't, well, this stage is going > to take even longer than it already has. Sigh. > > >> I was sorta hoping for something a bit better. > > I will be looking at alternatives. I am very much open to suggestions. > I'm not even 100% convinced that Stephen's objections to my separate > allocation strategy outweigh its advantages. If you have an opinion on > that, I'd love to hear it. > fwiw I prefer the separate allocation strategy, but as you have already said it trading off one set of problems for another. I would rather see this move forward and one set of trade offs isn't significantly worse than the other to me so, either wfm.