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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 583CCC433F5 for ; Mon, 20 Sep 2021 18:17:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4200A615A2 for ; Mon, 20 Sep 2021 18:17:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347754AbhITSSu (ORCPT ); Mon, 20 Sep 2021 14:18:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:33266 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358738AbhITSHk (ORCPT ); Mon, 20 Sep 2021 14:07:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 953C961A40; Mon, 20 Sep 2021 17:18:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632158319; bh=IgRgeHzLjFQkNEmtcNwB81HQaH4kHflDI/a8iwiIeQI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FxGHg37/QUCMdaI5wj8gmzne0o62Nh8RkQ8IvwWTo63veNLdagGcadyRAt+TmjyMo idNUGuhSX1oKJsw0sUw2r8b7OmHn9vW5G8VBOiivinGScEWz1lAeRnIlCNv5Ith2iC y0AZML6k5zYp0nd0XAABgEqi3oPNsSj1DZAwkIeY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tianjia Zhang , Casey Schaufler , Sasha Levin Subject: [PATCH 5.4 084/260] Smack: Fix wrong semantics in smk_access_entry() Date: Mon, 20 Sep 2021 18:41:42 +0200 Message-Id: <20210920163933.994882864@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163931.123590023@linuxfoundation.org> References: <20210920163931.123590023@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tianjia Zhang [ Upstream commit 6d14f5c7028eea70760df284057fe198ce7778dd ] In the smk_access_entry() function, if no matching rule is found in the rust_list, a negative error code will be used to perform bit operations with the MAY_ enumeration value. This is semantically wrong. This patch fixes this issue. Signed-off-by: Tianjia Zhang Signed-off-by: Casey Schaufler Signed-off-by: Sasha Levin --- security/smack/smack_access.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index 38ac3da4e791..beeba1a9be17 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -81,23 +81,22 @@ int log_policy = SMACK_AUDIT_DENIED; int smk_access_entry(char *subject_label, char *object_label, struct list_head *rule_list) { - int may = -ENOENT; struct smack_rule *srp; list_for_each_entry_rcu(srp, rule_list, list) { if (srp->smk_object->smk_known == object_label && srp->smk_subject->smk_known == subject_label) { - may = srp->smk_access; - break; + int may = srp->smk_access; + /* + * MAY_WRITE implies MAY_LOCK. + */ + if ((may & MAY_WRITE) == MAY_WRITE) + may |= MAY_LOCK; + return may; } } - /* - * MAY_WRITE implies MAY_LOCK. - */ - if ((may & MAY_WRITE) == MAY_WRITE) - may |= MAY_LOCK; - return may; + return -ENOENT; } /** -- 2.30.2