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=-11.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SIGNED_OFF_BY,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 8CE4CC5517A for ; Mon, 9 Nov 2020 22:47:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38513206C0 for ; Mon, 9 Nov 2020 22:47:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730249AbgKIWrP (ORCPT ); Mon, 9 Nov 2020 17:47:15 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:39615 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729451AbgKIWrO (ORCPT ); Mon, 9 Nov 2020 17:47:14 -0500 Received: from static-50-53-41-238.bvtn.or.frontiernet.net ([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 1kcFwK-00088K-3K; Mon, 09 Nov 2020 22:47:08 +0000 Subject: Re: [PATCH v22 12/23] LSM: Specify which LSM to display To: Casey Schaufler , Greg KH Cc: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-audit@redhat.com, keescook@chromium.org, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org References: <20201104234114.11346-1-casey@schaufler-ca.com> <20201104234114.11346-13-casey@schaufler-ca.com> <20201105092245.GB3439341@kroah.com> <31027d8e-50bc-70be-b4f2-a96a84de2bae@schaufler-ca.com> <20201107091529.GA23328@kroah.com> <04b4adf9-9313-7f5a-e7fe-6132e0c5fc4f@canonical.com> <496cad0c-9bca-24e9-6024-76a8b73754ed@schaufler-ca.com> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkU1bXJQb0JFQURB azE5UHNnVmdCS2tJbW1SMmlzUFE2bzdLSmhUVEtqSmR3VmJrV1NuTm4rbzZVcDVrCm5LUDFm NDlFQlFsY2VXZzF5cC9Od2JSOGFkK2VTRU8vdW1hL0srUHFXdkJwdEtDOVNXRDk3Rkc0dUI0 L2Nhb20KTEVVOTdzTFFNdG52R1dkeHJ4VlJHTTRhbnpXWU1neno1VFptSWlWVFo0M091NVZw YVMxVnoxWlN4UDNoL3hLTgpaci9UY1c1V1FhaTh1M1BXVm5ia2poU1pQSHYxQmdoTjY5cXhF UG9tckpCbTFnbXR4M1ppVm1GWGx1d1RtVGdKCk9rcEZvbDduYkowaWxuWUhyQTdTWDNDdFIx dXBlVXBNYS9XSWFuVk85NldkVGpISElhNDNmYmhtUXViZTR0eFMKM0ZjUUxPSlZxUXN4NmxF OUI3cUFwcG05aFExMHFQV3dkZlB5LyswVzZBV3ROdTVBU2lHVkNJbld6bDJIQnFZZAovWmxs OTN6VXErTklvQ244c0RBTTlpSCt3dGFHRGNKeXdJR0luK2VkS050SzcyQU1nQ2hUZy9qMVpv V0g2WmVXClBqdVVmdWJWelp0bzFGTW9HSi9TRjRNbWRRRzFpUU50ZjRzRlpiRWdYdXk5Y0dp 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<496cad0c-9bca-24e9-6024-76a8b73754ed@schaufler-ca.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/9/20 2:28 PM, Casey Schaufler wrote: > On 11/7/2020 2:05 PM, John Johansen wrote: >> On 11/7/20 1:15 AM, Greg KH wrote: >>> On Fri, Nov 06, 2020 at 04:20:43PM -0800, Casey Schaufler wrote: >>>> On 11/5/2020 1:22 AM, Greg KH wrote: >>>>> On Wed, Nov 04, 2020 at 03:41:03PM -0800, Casey Schaufler wrote: >>>>>> Create a new entry "display" in the procfs attr directory for >>>>>> controlling which LSM security information is displayed for a >>>>>> process. A process can only read or write its own display value. >>>>>> >>>>>> The name of an active LSM that supplies hooks for >>>>>> human readable data may be written to "display" to set the >>>>>> value. The name of the LSM currently in use can be read from >>>>>> "display". At this point there can only be one LSM capable >>>>>> of display active. A helper function lsm_task_display() is >>>>>> provided to get the display slot for a task_struct. >>>>>> >>>>>> Setting the "display" requires that all security modules using >>>>>> setprocattr hooks allow the action. Each security module is >>>>>> responsible for defining its policy. >>>>>> >>>>>> AppArmor hook provided by John Johansen >>>>>> SELinux hook provided by Stephen Smalley >>>>>> >>>>>> Reviewed-by: Kees Cook >>>>>> Acked-by: Stephen Smalley >>>>>> Acked-by: Paul Moore >>>>>> Signed-off-by: Casey Schaufler >>>>>> Cc: linux-api@vger.kernel.org >>>>>> --- >>>>>> fs/proc/base.c | 1 + >>>>>> include/linux/lsm_hooks.h | 17 +++ >>>>>> security/apparmor/include/apparmor.h | 3 +- >>>>>> security/apparmor/lsm.c | 32 +++++ >>>>>> security/security.c | 169 ++++++++++++++++++++++++--- >>>>>> security/selinux/hooks.c | 11 ++ >>>>>> security/selinux/include/classmap.h | 2 +- >>>>>> security/smack/smack_lsm.c | 7 ++ >>>>>> 8 files changed, 223 insertions(+), 19 deletions(-) >>>>>> >>>>>> diff --git a/fs/proc/base.c b/fs/proc/base.c >>>>>> index 0f707003dda5..7432f24f0132 100644 >>>>>> --- a/fs/proc/base.c >>>>>> +++ b/fs/proc/base.c >>>>>> @@ -2806,6 +2806,7 @@ static const struct pid_entry attr_dir_stuff[] = { >>>>>> ATTR(NULL, "fscreate", 0666), >>>>>> ATTR(NULL, "keycreate", 0666), >>>>>> ATTR(NULL, "sockcreate", 0666), >>>>>> + ATTR(NULL, "display", 0666), >>>>> That's a vague name, any chance it can be more descriptive? >>>> Sure. How about lsm_display, or display_lsm? I wouldn't say that >>>> any of the files in /proc/*/attr have especially descriptive names, >>>> but that's hardly an excuse. >>> I still don't understand what "display" means in this context. Perhaps >> its the LSM thats context is being displayed on the shared interface, >> ie. /proc/*/attr/* >> >> thinking about it more owner or even interface_owner might be a better >> name > > I was hoping for a single word, but I see how something more descriptive > might be in order. How about "lsm_of_current"? Or "lsm_of_dot_slash_current", > if you want to be pedantic. "format_of_current" isn't quite accurate, but > might be easier for some people to understand. Maybe "interface_owning_lsm". > > /proc/*/attr/display answers the question "Which LSM is providing the data > I see if I look in /proc/*/attr/current, prev or exec or if that process uses > SO_PEERSEC". > lsm_of_current or interface_lsm or interface_owning_lsm all wfm > >>> documentation will help clear it up? >>> >> yeah this needs documented. > > Agreed. I've noticed that nothing in /proc/*/attr seems documented > in an orderly (documentation/ABI) fashion. I will have to fix some of > that for a description of /proc/*/attr/whatever_it_ends_up_getting_called > to make sense. Working on it. > >>> thanks, >>> >>> greg k-h >>> > 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=-11.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SIGNED_OFF_BY,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 E7870C56201 for ; Mon, 9 Nov 2020 22:54:04 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 40B5120789 for ; Mon, 9 Nov 2020 22:54:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 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lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id C9B44922FE; Mon, 9 Nov 2020 22:53:56 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 0A9MlLhH030933 for ; Mon, 9 Nov 2020 17:47:21 -0500 Received: by smtp.corp.redhat.com (Postfix) id 59104200E1F1; Mon, 9 Nov 2020 22:47:21 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast06.extmail.prod.ext.rdu2.redhat.com [10.11.55.22]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5378A200E21A for ; Mon, 9 Nov 2020 22:47:19 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2C804185A790 for ; Mon, 9 Nov 2020 22:47:19 +0000 (UTC) Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-559-GPNTZruROeyxEBwwgkID3A-1; Mon, 09 Nov 2020 17:47:17 -0500 X-MC-Unique: GPNTZruROeyxEBwwgkID3A-1 Received: from static-50-53-41-238.bvtn.or.frontiernet.net ([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 1kcFwK-00088K-3K; Mon, 09 Nov 2020 22:47:08 +0000 Subject: Re: [PATCH v22 12/23] LSM: Specify which LSM to display To: Casey Schaufler , Greg KH References: <20201104234114.11346-1-casey@schaufler-ca.com> <20201104234114.11346-13-casey@schaufler-ca.com> <20201105092245.GB3439341@kroah.com> <31027d8e-50bc-70be-b4f2-a96a84de2bae@schaufler-ca.com> <20201107091529.GA23328@kroah.com> <04b4adf9-9313-7f5a-e7fe-6132e0c5fc4f@canonical.com> <496cad0c-9bca-24e9-6024-76a8b73754ed@schaufler-ca.com> From: John Johansen Autocrypt: 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Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-loop: linux-audit@redhat.com X-Mailman-Approved-At: Mon, 09 Nov 2020 17:53:46 -0500 Cc: selinux@vger.kernel.org, linux-api@vger.kernel.org, jmorris@namei.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-audit@redhat.com, casey.schaufler@intel.com, sds@tycho.nsa.gov 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 2.79 on 10.5.11.11 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 11/9/20 2:28 PM, Casey Schaufler wrote: > On 11/7/2020 2:05 PM, John Johansen wrote: >> On 11/7/20 1:15 AM, Greg KH wrote: >>> On Fri, Nov 06, 2020 at 04:20:43PM -0800, Casey Schaufler wrote: >>>> On 11/5/2020 1:22 AM, Greg KH wrote: >>>>> On Wed, Nov 04, 2020 at 03:41:03PM -0800, Casey Schaufler wrote: >>>>>> Create a new entry "display" in the procfs attr directory for >>>>>> controlling which LSM security information is displayed for a >>>>>> process. A process can only read or write its own display value. >>>>>> >>>>>> The name of an active LSM that supplies hooks for >>>>>> human readable data may be written to "display" to set the >>>>>> value. The name of the LSM currently in use can be read from >>>>>> "display". At this point there can only be one LSM capable >>>>>> of display active. A helper function lsm_task_display() is >>>>>> provided to get the display slot for a task_struct. >>>>>> >>>>>> Setting the "display" requires that all security modules using >>>>>> setprocattr hooks allow the action. Each security module is >>>>>> responsible for defining its policy. >>>>>> >>>>>> AppArmor hook provided by John Johansen >>>>>> SELinux hook provided by Stephen Smalley >>>>>> >>>>>> Reviewed-by: Kees Cook >>>>>> Acked-by: Stephen Smalley >>>>>> Acked-by: Paul Moore >>>>>> Signed-off-by: Casey Schaufler >>>>>> Cc: linux-api@vger.kernel.org >>>>>> --- >>>>>> fs/proc/base.c | 1 + >>>>>> include/linux/lsm_hooks.h | 17 +++ >>>>>> security/apparmor/include/apparmor.h | 3 +- >>>>>> security/apparmor/lsm.c | 32 +++++ >>>>>> security/security.c | 169 ++++++++++++++++++++++++--- >>>>>> security/selinux/hooks.c | 11 ++ >>>>>> security/selinux/include/classmap.h | 2 +- >>>>>> security/smack/smack_lsm.c | 7 ++ >>>>>> 8 files changed, 223 insertions(+), 19 deletions(-) >>>>>> >>>>>> diff --git a/fs/proc/base.c b/fs/proc/base.c >>>>>> index 0f707003dda5..7432f24f0132 100644 >>>>>> --- a/fs/proc/base.c >>>>>> +++ b/fs/proc/base.c >>>>>> @@ -2806,6 +2806,7 @@ static const struct pid_entry attr_dir_stuff[] = { >>>>>> ATTR(NULL, "fscreate", 0666), >>>>>> ATTR(NULL, "keycreate", 0666), >>>>>> ATTR(NULL, "sockcreate", 0666), >>>>>> + ATTR(NULL, "display", 0666), >>>>> That's a vague name, any chance it can be more descriptive? >>>> Sure. How about lsm_display, or display_lsm? I wouldn't say that >>>> any of the files in /proc/*/attr have especially descriptive names, >>>> but that's hardly an excuse. >>> I still don't understand what "display" means in this context. Perhaps >> its the LSM thats context is being displayed on the shared interface, >> ie. /proc/*/attr/* >> >> thinking about it more owner or even interface_owner might be a better >> name > > I was hoping for a single word, but I see how something more descriptive > might be in order. How about "lsm_of_current"? Or "lsm_of_dot_slash_current", > if you want to be pedantic. "format_of_current" isn't quite accurate, but > might be easier for some people to understand. Maybe "interface_owning_lsm". > > /proc/*/attr/display answers the question "Which LSM is providing the data > I see if I look in /proc/*/attr/current, prev or exec or if that process uses > SO_PEERSEC". > lsm_of_current or interface_lsm or interface_owning_lsm all wfm > >>> documentation will help clear it up? >>> >> yeah this needs documented. > > Agreed. I've noticed that nothing in /proc/*/attr seems documented > in an orderly (documentation/ABI) fashion. I will have to fix some of > that for a description of /proc/*/attr/whatever_it_ends_up_getting_called > to make sense. Working on it. > >>> thanks, >>> >>> greg k-h >>> > -- Linux-audit mailing list Linux-audit@redhat.com https://www.redhat.com/mailman/listinfo/linux-audit