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> 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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 >>> >