From patchwork Mon May 17 13:41:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ondrej Mosnacek X-Patchwork-Id: 12262015 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=-19.1 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, USER_AGENT_GIT 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 D0BF2C43460 for ; Mon, 17 May 2021 13:42:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AD16960FD8 for ; Mon, 17 May 2021 13:42:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237440AbhEQNnZ (ORCPT ); Mon, 17 May 2021 09:43:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:56910 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237445AbhEQNnZ (ORCPT ); Mon, 17 May 2021 09:43:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621258928; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=H6x6dlAzQJeEEcgnxw7b14Lv0Ybic0pb80Lf+1COmZk=; b=NVWLLx9Lg3A/SUDrZKIhi/HHd1y1INi6JNZmBX0Egm7QCNtK2pKAXQSJaJ590a1/k0hRV+ xm0cLOq2PgwrjP7JstwEx8eCVooujU8CjQJPoPaq927bSWkDoSJt2RVjh36+8zvhs/xap9 eulWkRhuDSnRlI538v/T6Il6rqzEGfM= Received: from mail-ed1-f69.google.com (mail-ed1-f69.google.com [209.85.208.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-372-tL2b1rkYP1eOBcSg9lZAtw-1; Mon, 17 May 2021 09:42:06 -0400 X-MC-Unique: tL2b1rkYP1eOBcSg9lZAtw-1 Received: by mail-ed1-f69.google.com with SMTP id n6-20020a0564020606b029038cdc241890so3915549edv.20 for ; Mon, 17 May 2021 06:42:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=H6x6dlAzQJeEEcgnxw7b14Lv0Ybic0pb80Lf+1COmZk=; b=cfDGczD4nERmlXpLsMJgmx9HOfNuRNNGe2k56Cda/6tZS9F2W9SWnpN6pymA1NWsxD LyZIQ4R/glNYEvZ2ocqC+xfRolwluAUPPQcW+DEe3A9/AyrW+Pjx5LOvSvAJO5CMuZSw ob15m/nNd6UUIyBsSvDsnJxcIHrJWZxlUf56+MPoTnKFJJygtVN9Vh2Nr0c3VPtgNM9h waBjAkdaF6UYHeJIfuWfiur0Y23GlsqgS5IRfioGEmp6DEP7v97V4xI0l4B4fI5LFMQ4 1GgyUhyv4sMGBJV/0wzlNY1+55V6ZflDK9SczNyEs7yhn1hOiRdFHhgTPDX65k9VKgyY Ko8A== X-Gm-Message-State: AOAM532ahfqmj+khcDw9k88tDe06MLYu4RLeBPNwlJIQ/qeiX/cknPEU AOiuuINiyFQjl8coYl252hygpNxPcJdBFlltZ2tYKRgEDjCG34q+4vQ1F2o7AHPFH6H2u/LQIeX vEuXFwvnl2vOfV39MQNrfrW+3Uw== X-Received: by 2002:a17:907:1007:: with SMTP id ox7mr4482ejb.82.1621258925019; Mon, 17 May 2021 06:42:05 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxOnrwdmJm9wKgv4E3uyq02kBsINeKG2K+kyigE4PMhwjioTBtobRTknqqvWz3J64hwJZiBMw== X-Received: by 2002:a17:907:1007:: with SMTP id ox7mr4465ejb.82.1621258924851; Mon, 17 May 2021 06:42:04 -0700 (PDT) Received: from localhost.localdomain ([2a02:8308:b105:dd00:277b:6436:24db:9466]) by smtp.gmail.com with ESMTPSA id f7sm11302466edd.5.2021.05.17.06.42.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 May 2021 06:42:04 -0700 (PDT) From: Ondrej Mosnacek To: linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Paul Moore , Olga Kornievskaia , Al Viro , David Howells , Stephen Smalley , Richard Haines Subject: [PATCH v2 0/2] vfs/security/NFS/btrfs: clean up and fix LSM option handling Date: Mon, 17 May 2021 15:41:59 +0200 Message-Id: <20210517134201.29271-1-omosnace@redhat.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This series fixes two bugs: 1. A bug with BTRFS where LSM options are ignored when BTRFS is mounted via the new fsconfig(2) API. (fixed by patch 1) 2. A bug with NFS + SELinux where an attempt to do the same mount twice might incidentally turn off LSM labeling, making any fresh inode show up as unlabeled. (fixed by patch 2, with patch 1 as a prereq) For bug (1.) I previously posted a different patch [1], which is no longer needed if these patches are applied. While these patches do add a new fs_type flag (which seems to be frowned upon), they also reduce the semantics of FS_BINARY_MOUNT_DATA flag to *only* the mount data being binary, while before it was also (ab)used to skip mount option processing in SELinux for NFS and BTRFS. The result is perhaps still not perfect, but it seems to be the only non-invasive solution for these bugs in the short term. Once BTRFS is finally converted to the new mount API, a lot of the ugliness can likely be refactored to something nicer (and these patches do not really make that any harder to do, IMHO). I tested the patches by running the NFS part of the SELinux testsuite [2] (which is now fully passing). I also ran the proposed BTRFS SELinux test coverage for selinux-testsuite [3], which is now passing. Changes since v1: - in BTRFS, move the FS_HANDLES_LSM_OPTS flag to btrfs_root_fs_type, and remove FS_BINARY_MOUNTDATA from both fs_types now v1: https://lore.kernel.org/selinux/20210409111254.271800-1-omosnace@redhat.com/T/ [1] https://lore.kernel.org/selinux/20210401065403.GA1363493@infradead.org/T/ [2] https://github.com/SELinuxProject/selinux-testsuite/ [3] https://lore.kernel.org/selinux/20201103110121.53919-2-richard_c_haines@btinternet.com/ ^^ the original patch no longer applies - a rebased version is here: https://github.com/WOnder93/selinux-testsuite/commit/212e76b5bd0775c7507c1996bd172de3bcbff139.patch Ondrej Mosnacek (2): vfs,LSM: introduce the FS_HANDLES_LSM_OPTS flag selinux: fix SECURITY_LSM_NATIVE_LABELS flag handling on double mount fs/btrfs/super.c | 34 +++++----------------------------- fs/nfs/fs_context.c | 6 ++++-- fs/super.c | 10 ++++++---- include/linux/fs.h | 3 ++- security/selinux/hooks.c | 32 +++++++++++++++++--------------- 5 files changed, 34 insertions(+), 51 deletions(-)