From patchwork Wed Oct 18 00:53:22 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thiago Jung Bauermann X-Patchwork-Id: 10013261 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 C2240600CC for ; Wed, 18 Oct 2017 00:58:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B306028A68 for ; Wed, 18 Oct 2017 00:58:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A7E8128A6A; Wed, 18 Oct 2017 00:58:16 +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 4CD6D28A68 for ; Wed, 18 Oct 2017 00:58:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752510AbdJRA6O (ORCPT ); Tue, 17 Oct 2017 20:58:14 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:45472 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761721AbdJRAyq (ORCPT ); Tue, 17 Oct 2017 20:54:46 -0400 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v9I0rVbP076924 for ; Tue, 17 Oct 2017 20:54:45 -0400 Received: from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201]) by mx0a-001b2d01.pphosted.com with ESMTP id 2dnrwhrega-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 17 Oct 2017 20:54:45 -0400 Received: from localhost by e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Miller" , "AKASHI, Takahiro" , Thiago Jung Bauermann Subject: [PATCH v5 09/18] ima: Don't pass xattr value to EVM xattr verification. Date: Tue, 17 Oct 2017 22:53:22 -0200 X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171018005331.2688-1-bauerman@linux.vnet.ibm.com> References: <20171018005331.2688-1-bauerman@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17101800-2213-0000-0000-0000022D4FDE X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007909; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000237; SDB=6.00932661; UDB=6.00469691; IPR=6.00712951; BA=6.00005643; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00017583; XFM=3.00000015; UTC=2017-10-18 00:54:42 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17101800-2214-0000-0000-000057E37994 Message-Id: <20171018005331.2688-10-bauerman@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-10-17_15:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1710180012 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP The patch implementing modsig support will retry verifying the xattr signature if the modsig verification fails, and if we have already passed the modsig as the xattr_value we'll have problems if we pass the xattr sig in the second call to evm_verifyxattr. Since this is an optimization and not actually required, just don't do it. Suggested-by: Mimi Zohar Signed-off-by: Thiago Jung Bauermann --- security/integrity/ima/ima_appraise.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 091977c8ec40..58e147049e98 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -229,7 +229,7 @@ int ima_appraise_measurement(enum ima_hooks func, goto out; } - status = evm_verifyxattr(dentry, XATTR_NAME_IMA, xattr_value, rc, iint); + status = evm_verifyxattr(dentry, XATTR_NAME_IMA, NULL, 0, iint); switch (status) { case INTEGRITY_PASS: case INTEGRITY_UNKNOWN: