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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 775DCC433E0 for ; Wed, 10 Mar 2021 14:41:45 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D4E0764EC6 for ; Wed, 10 Mar 2021 14:41:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D4E0764EC6 Authentication-Results: mail.kernel.org; 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TLS) by relay.mimecast.com with ESMTP id us-mta-389-z5JTjcMrPluUF6Pixy5o7g-1; Tue, 09 Mar 2021 22:09:07 -0500 X-MC-Unique: z5JTjcMrPluUF6Pixy5o7g-1 Received: from [50.53.41.238] (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 1lJpDe-0002FI-DM; Wed, 10 Mar 2021 03:09:06 +0000 Subject: Re: [RFC PATCH 1/4] lsm: separate security_task_getsecid() into subjective and objective variants To: Paul Moore References: <161377712068.87807.12246856567527156637.stgit@sifl> <161377734508.87807.8537642254664217815.stgit@sifl> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkU1bXJQb0JFQURB azE5UHNnVmdCS2tJbW1SMmlzUFE2bzdLSmhUVEtqSmR3VmJrV1NuTm4rbzZVcDVrCm5LUDFm NDlFQlFsY2VXZzF5cC9Od2JSOGFkK2VTRU8vdW1hL0srUHFXdkJwdEtDOVNXRDk3Rkc0dUI0 L2Nhb20KTEVVOTdzTFFNdG52R1dkeHJ4VlJHTTRhbnpXWU1neno1VFptSWlWVFo0M091NVZw 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Cc: selinux@vger.kernel.org, linux-security-module@vger.kernel.org, linux-audit@redhat.com X-BeenThere: linux-audit@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Linux Audit Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-audit-bounces@redhat.com Errors-To: linux-audit-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-audit-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 3/9/21 4:28 PM, Paul Moore wrote: > On Wed, Mar 3, 2021 at 7:44 PM Paul Moore wrote: >> On Sun, Feb 21, 2021 at 7:51 AM John Johansen >> wrote: >>> On 2/19/21 3:29 PM, Paul Moore wrote: >>>> Of the three LSMs that implement the security_task_getsecid() LSM >>>> hook, all three LSMs provide the task's objective security >>>> credentials. This turns out to be unfortunate as most of the hook's >>>> callers seem to expect the task's subjective credentials, although >>>> a small handful of callers do correctly expect the objective >>>> credentials. >>>> >>>> This patch is the first step towards fixing the problem: it splits >>>> the existing security_task_getsecid() hook into two variants, one >>>> for the subjective creds, one for the objective creds. >>>> >>>> void security_task_getsecid_subj(struct task_struct *p, >>>> u32 *secid); >>>> void security_task_getsecid_obj(struct task_struct *p, >>>> u32 *secid); >>>> >>>> While this patch does fix all of the callers to use the correct >>>> variant, in order to keep this patch focused on the callers and to >>>> ease review, the LSMs continue to use the same implementation for >>>> both hooks. The net effect is that this patch should not change >>>> the behavior of the kernel in any way, it will be up to the latter >>>> LSM specific patches in this series to change the hook >>>> implementations and return the correct credentials. >>>> >>>> Signed-off-by: Paul Moore >>> >>> So far this looks good. I want to take another stab at it and give >>> it some testing >> >> Checking in as I know you said you needed to fix/release the AppArmor >> patch in this series ... is this patch still looking okay to you? If >> so, can I get an ACK at least on this patch? > > Hi John, > > Any objections if I merge the LSM, SELinux, and Smack patches into the > selinux/next tree so that we can start getting some wider testing? If > I leave out my poor attempt at an AppArmor patch, the current in-tree > AppArmor code should behave exactly as it does today with the > apparmor_task_getsecid() function handling both the subjective and > objective creds. I can always merge the AppArmor patch later when you > have it ready, or you can merge it via your AppArmor tree at a later > date. > I have some questions around selinux and binder but I don't have any objections to you merging, we can always drop fixes on top if they are necessary -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit