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=-18.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,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 AD5CAC432BE for ; Tue, 24 Aug 2021 20:57:44 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 545186113B for ; Tue, 24 Aug 2021 20:57:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 545186113B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1629838663; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=K46e+uGGY4N2lP6q0e8Wi6VvuWN2vsnRccKNJ1uhCng=; b=gv4kfmUCcjme3uhN3N7lnTP6T2mx7s9gQSdK5a08odg63IWDkqmm8uLpywU+x0AGEIy1Dv 93nSLNCwthlk97Z0M5nqRObG5hvhN9GVuX7kE52hyBpUR2rDpmKQfwbd0pCf24pzT9xbqU 0sQIkLNiOkjVs6WQEeB8xYlAbb0lFgs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-400-l_OAb2IkPpWXAgklNOdAKw-1; Tue, 24 Aug 2021 16:57:41 -0400 X-MC-Unique: l_OAb2IkPpWXAgklNOdAKw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2A15F875049; Tue, 24 Aug 2021 20:57:38 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4CEBF60C82; Tue, 24 Aug 2021 20:57:37 +0000 (UTC) Received: from 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 AC48E1819AC9; Tue, 24 Aug 2021 20:57:35 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 17OKvXTD005301 for ; Tue, 24 Aug 2021 16:57:33 -0400 Received: by smtp.corp.redhat.com (Postfix) id B37555DA61; Tue, 24 Aug 2021 20:57:33 +0000 (UTC) Received: from madcap2.tricolour.ca (unknown [10.3.128.14]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0C4355DA2D; Tue, 24 Aug 2021 20:57:26 +0000 (UTC) Date: Tue, 24 Aug 2021 16:57:24 -0400 From: Richard Guy Briggs To: Paul Moore Subject: Re: [RFC PATCH v2 0/9] Add LSM access controls and auditing to io_uring Message-ID: <20210824205724.GB490529@madcap2.tricolour.ca> References: <162871480969.63873.9434591871437326374.stgit@olly> MIME-Version: 1.0 In-Reply-To: <162871480969.63873.9434591871437326374.stgit@olly> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-loop: linux-audit@redhat.com Cc: Jens Axboe , selinux@vger.kernel.org, Pavel Begunkov , linux-security-module@vger.kernel.org, linux-audit@redhat.com, Kumar Kartikeya Dwivedi , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org 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 10.5.11.12 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-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 2021-08-11 16:48, Paul Moore wrote: > Draft #2 of the patchset which brings auditing and proper LSM access > controls to the io_uring subsystem. The original patchset was posted > in late May and can be found via lore using the link below: > > https://lore.kernel.org/linux-security-module/162163367115.8379.8459012634106035341.stgit@sifl/ > > This draft should incorporate all of the feedback from the original > posting as well as a few smaller things I noticed while playing > further with the code. The big change is of course the selective > auditing in the io_uring op servicing, but that has already been > discussed quite a bit in the original thread so I won't go into > detail here; the important part is that we found a way to move > forward and this draft captures that. For those of you looking to > play with these patches, they are based on Linus' v5.14-rc5 tag and > on my test system they boot and appear to function without problem; > they pass the selinux-testsuite and audit-testsuite and I have not > noticed any regressions in the normal use of the system. If you want > to get a copy of these patches straight from git you can use the > "working-io_uring" branch in the repo below: > > git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git > https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git > > Beyond the existing test suite tests mentioned above, I've cobbled > together some very basic, very crude tests to exercise some of the > things I care about from a LSM/audit perspective. These tests are > pretty awful (I'm not kidding), but they might be helpful for the > other LSM/audit developers who want to test things: > > https://drop.paul-moore.com/90.kUgq > > There are currently two tests: 'iouring.2' and 'iouring.3'; > 'iouring.1' was lost in a misguided and overzealous 'rm' command. > The first test is standalone and basically tests the SQPOLL > functionality while the second tests sharing io_urings across process > boundaries and the credential/personality sharing mechanism. The > console output of both tests isn't particularly useful, the more > interesting bits are in the audit and LSM specific logs. The > 'iouring.2' command requires no special arguments to run but the > 'iouring.3' test is split into a "server" and "client"; the server > should be run without argument: > > % ./iouring.3s > >>> server started, pid = 11678 > >>> memfd created, fd = 3 > >>> io_uring created; fd = 5, creds = 1 > > ... while the client should be run with two arguments: the first is > the PID of the server process, the second is the "memfd" fd number: > > % ./iouring.3c 11678 3 > >>> client started, server_pid = 11678 server_memfd = 3 > >>> io_urings = 5 (server) / 5 (client) > >>> io_uring ops using creds = 1 > >>> async op result: 36 > >>> async op result: 36 > >>> async op result: 36 > >>> async op result: 36 > >>> START file contents > What is this life if, full of care, > we have no time to stand and stare. > >>> END file contents > > The tests were hacked together from various sources online, > attribution and links to additional info can be found in the test > sources, but I expect these tests to die a fiery death in the not > to distant future as I work to add some proper tests to the SELinux > and audit test suites. > > As I believe these patches should spend a full -rcX cycle in > linux-next, my current plan is to continue to solicit feedback on > these patches while they undergo additional testing (next up is > verification of the audit filter code for io_uring). Assuming no > critical issues are found on the mailing lists or during testing, I > will post a proper patchset later with the idea of merging it into > selinux/next after the upcoming merge window closes. > > Any comments, feedback, etc. are welcome. Thanks for the tests. I have a bunch of userspace patches to add to the last set I posted and these tests will help exercise them. I also have one more kernel patch to post... I'll dive back into that now. I had wanted to post them before now but got distracted with AUDIT_TRIM breakage. > --- > > Casey Schaufler (1): > Smack: Brutalist io_uring support with debug > > Paul Moore (8): > audit: prepare audit_context for use in calling contexts beyond > syscalls > audit,io_uring,io-wq: add some basic audit support to io_uring > audit: dev/test patch to force io_uring auditing > audit: add filtering for io_uring records > fs: add anon_inode_getfile_secure() similar to > anon_inode_getfd_secure() > io_uring: convert io_uring to the secure anon inode interface > lsm,io_uring: add LSM hooks to io_uring > selinux: add support for the io_uring access controls > > > fs/anon_inodes.c | 29 ++ > fs/io-wq.c | 4 + > fs/io_uring.c | 69 +++- > include/linux/anon_inodes.h | 4 + > include/linux/audit.h | 26 ++ > include/linux/lsm_hook_defs.h | 5 + > include/linux/lsm_hooks.h | 13 + > include/linux/security.h | 16 + > include/uapi/linux/audit.h | 4 +- > kernel/audit.h | 7 +- > kernel/audit_tree.c | 3 +- > kernel/audit_watch.c | 3 +- > kernel/auditfilter.c | 15 +- > kernel/auditsc.c | 483 +++++++++++++++++++----- > security/security.c | 12 + > security/selinux/hooks.c | 34 ++ > security/selinux/include/classmap.h | 2 + > security/smack/smack_lsm.c | 64 ++++ > 18 files changed, 678 insertions(+), 115 deletions(-) > - RGB -- Richard Guy Briggs Sr. S/W Engineer, Kernel Security, Base Operating Systems Remote, Ottawa, Red Hat Canada IRC: rgb, SunRaycer Voice: +1.647.777.2635, Internal: (81) 32635 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit