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=-14.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham 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 ED525C433E0 for ; Wed, 27 May 2020 16:02:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C93B720776 for ; Wed, 27 May 2020 16:02:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OGxkG7z5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388797AbgE0QCP (ORCPT ); Wed, 27 May 2020 12:02:15 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:57083 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2388395AbgE0QCP (ORCPT ); Wed, 27 May 2020 12:02:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1590595333; 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=NDotd2QTTWfxGfPxoSS/0DkiwnhHRI7ydQ8UgcxclFw=; b=OGxkG7z5f/9ag7De0iSpQO3A75RT29Xpw7rGQg2QeTo7wZzmiqOnZbPj8h0AZ57kp9yDzX tcjGGtB8rhUpaXUYDOptURdgyNVyju0RPfNXvU4WNWip2SxIJOPOpfgZ3YRWYU/a7lr71C f8AYOSr+43L5sbkPI+dDoxkw/SIVF/I= Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-77-XmlvdxiEOoiJEIdtMJhvDA-1; Wed, 27 May 2020 12:01:51 -0400 X-MC-Unique: XmlvdxiEOoiJEIdtMJhvDA-1 Received: by mail-qt1-f199.google.com with SMTP id n33so26160581qtd.10 for ; Wed, 27 May 2020 09:01:51 -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=NDotd2QTTWfxGfPxoSS/0DkiwnhHRI7ydQ8UgcxclFw=; b=AV1nzFQtBS1PexppVU+WTCbaKx1opv05it4NmiXLW4QGNgnVx3uQxWZvq1THl0oLeK M1HMNvTPuNfGC0XgJHubdoVlKnxiUfUsxFXbQO4lSm1XkTslUkhL+2866OAEPkyLcx6l bNrevEf8HD6Bql+xTfVgvW2K49TsitBfuciqJDVSuqzzFvZRAznc0s8k6e0kq4zo2T8i aZfrSNYmElIe0+3e2vuUxR/XIvCxgGqKbm2FQs5J9BEHQcKjCZAIw6L/FYp72QmSXFQO JBDg+GhIKvyNzZcNKa5tDDlJN71PcmCgBko2UT2IRyFkhIER6TMo2tw1YZzLTtilUNCY n+sQ== X-Gm-Message-State: AOAM532dan5zAeLscGznthMxdM4swFDtCRiWBkAVgjBk7anyKc92cCL3 oLOMS5uz2LCbs6EdaHYd5sckQ5BQyXscEKnzVJjJ28Lsorm1PL17/GIdApmZdAnJYTNvzjRtMJb TNN/KmyPLD8Z9BUmZBg== X-Received: by 2002:a37:dd6:: with SMTP id 205mr4571506qkn.323.1590595310259; Wed, 27 May 2020 09:01:50 -0700 (PDT) X-Google-Smtp-Source: ABdhPJz/2gHYZ0UTA7lt+QYJLkNoiALzJtrGOoCvSneXl6e3kz8tIv8CkiLSnnl9Gdn2mnqx+Nz0kw== X-Received: by 2002:a37:dd6:: with SMTP id 205mr4571473qkn.323.1590595309960; Wed, 27 May 2020 09:01:49 -0700 (PDT) Received: from pet.redhat.com (107-190-106-186.cpe.teksavvy.com. [107.190.106.186]) by smtp.gmail.com with ESMTPSA id i94sm2717460qtd.2.2020.05.27.09.01.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 May 2020 09:01:47 -0700 (PDT) From: Jonathan Lebon To: selinux@vger.kernel.org Cc: Jonathan Lebon Subject: [PATCH v2] selinux: allow reading labels before policy is loaded Date: Wed, 27 May 2020 11:56:12 -0400 Message-Id: <20200527155610.156633-1-jlebon@redhat.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org This patch does for `getxattr` what 3e3e24b4204 did for `setxattr`; it allows querying the current SELinux label on disk before the policy is loaded. One of the motivations described in that commit message also drives this patch: for Fedora CoreOS (and eventually RHEL CoreOS), we want to be able to move the root filesystem for example, from xfs to ext4 on RAID, on first boot, at initrd time.[1] Because such an operation works at the filesystem level, we need to be able to read the SELinux labels first from the original root, and apply them to the files of the new root. Commit 3e3e24b4204 enabled the second part of this process; this patch enables the first part. [1] https://github.com/coreos/fedora-coreos-tracker/issues/94 Signed-off-by: Jonathan Lebon --- security/selinux/hooks.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 0b4e32161b7..67ee2cfc25b 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3334,7 +3334,9 @@ static int selinux_inode_getsecurity(struct inode *inode, const char *name, void char *context = NULL; struct inode_security_struct *isec; - if (strcmp(name, XATTR_SELINUX_SUFFIX)) + /* If we're not initialized yet, then we can't validate contexts, + * so just let vfs_getxattr fall back to using the on-disk xattr. */ + if (strcmp(name, XATTR_SELINUX_SUFFIX) || !selinux_state.initialized) return -EOPNOTSUPP; /* -- 2.25.4