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=-0.8 required=3.0 tests=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 847ACC3A5A2 for ; Thu, 22 Aug 2019 21:18:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 38BC120673 for ; Thu, 22 Aug 2019 21:18:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390274AbfHVVSq (ORCPT ); Thu, 22 Aug 2019 17:18:46 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:48990 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729994AbfHVVSq (ORCPT ); Thu, 22 Aug 2019 17:18:46 -0400 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::d71]) (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 EC98815363ECE; Thu, 22 Aug 2019 14:18:45 -0700 (PDT) Date: Thu, 22 Aug 2019 14:18:45 -0700 (PDT) Message-Id: <20190822.141845.217313560870249775.davem@davemloft.net> To: casey@schaufler-ca.com Cc: fw@strlen.de, paul@paul-moore.com, netdev@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: Re: New skb extension for use by LSMs (skb "security blob")? From: David Miller In-Reply-To: <32646e98-2ed6-a63a-5589-fefd57e85f66@schaufler-ca.com> References: <00ab1a3e-fd57-fe42-04fa-d82c1585b360@schaufler-ca.com> <20190822201520.GJ20113@breakpoint.cc> <32646e98-2ed6-a63a-5589-fefd57e85f66@schaufler-ca.com> X-Mailer: Mew version 6.8 on Emacs 26.1 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]); Thu, 22 Aug 2019 14:18:46 -0700 (PDT) Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org From: Casey Schaufler Date: Thu, 22 Aug 2019 13:35:01 -0700 > If the secmark where replaced by a security blob, the u32 secmark field > in an sk_buff would be replaced by a void * security field. You can already use the secmark to hash to some kind of pointer or other object.