From patchwork Thu Oct 12 00:57:08 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 10000857 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1F64D60216 for ; Thu, 12 Oct 2017 01:00:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1645528B73 for ; Thu, 12 Oct 2017 01:00:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0B1BE28C07; Thu, 12 Oct 2017 01:00:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7442C28B73 for ; Thu, 12 Oct 2017 01:00:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752485AbdJLA6y (ORCPT ); Wed, 11 Oct 2017 20:58:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60056 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752941AbdJLA6u (ORCPT ); Wed, 11 Oct 2017 20:58:50 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id F3610806AF; Thu, 12 Oct 2017 00:58:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com F3610806AF Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=rgb@redhat.com Received: from madcap2.tricolour.ca (ovpn-112-68.rdu2.redhat.com [10.10.112.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id C1BFF18630; Thu, 12 Oct 2017 00:58:46 +0000 (UTC) From: Richard Guy Briggs To: linux-security-module@vger.kernel.org, linux-audit@redhat.com, linux-kernel@vger.kernel.org Cc: Richard Guy Briggs , Kees Cook , Andy Lutomirski , "Serge E . Hallyn" , James Morris , Paul Moore , Steve Grubb , Eric Paris Subject: [PATCH GHAK16 V5 04/10] capabilities: use root_priveleged inline to clarify logic Date: Wed, 11 Oct 2017 20:57:08 -0400 Message-Id: <5854c1e5862925f3f9ca9614c42fb4a9c5330556.1507769413.git.rgb@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Thu, 12 Oct 2017 00:58:50 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Introduce inline root_privileged() to make use of SECURE_NONROOT easier to read. Suggested-by: Serge Hallyn Signed-off-by: Richard Guy Briggs Reviewed-by: Serge Hallyn Acked-by: James Morris Acked-by: Kees Cook Okay-ished-by: Paul Moore --- security/commoncap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/security/commoncap.c b/security/commoncap.c index 13661d3..9b8a6e7 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -695,6 +695,8 @@ static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_f return rc; } +static inline bool root_privileged(void) { return !issecure(SECURE_NOROOT); } + /* * handle_privileged_root - Handle case of privileged root * @bprm: The execution parameters, including the proposed creds @@ -713,7 +715,7 @@ static void handle_privileged_root(struct linux_binprm *bprm, bool has_fcap, const struct cred *old = current_cred(); struct cred *new = bprm->cred; - if (issecure(SECURE_NOROOT)) + if (!root_privileged()) return; /* * If the legacy file capability is set, then don't set privs @@ -838,7 +840,7 @@ int cap_bprm_set_creds(struct linux_binprm *bprm) if (__cap_grew(effective, ambient, new)) { if (!__cap_full(effective, new) || !uid_eq(new->euid, root_uid) || !uid_eq(new->uid, root_uid) || - issecure(SECURE_NOROOT)) { + !root_privileged()) { ret = audit_log_bprm_fcaps(bprm, new, old); if (ret < 0) return ret;