From: Thiago Jung Bauermann Subject: [PATCH v3 6/7] ima: Store measurement after appraisal Date: Thu, 6 Jul 2017 19:17:52 -0300 Message-ID: <20170706221753.17380-7-bauerman@linux.vnet.ibm.com> References: <20170706221753.17380-1-bauerman@linux.vnet.ibm.com> Cc: linux-ima-devel@lists.sourceforge.net, keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Mimi Zohar , Dmitry Kasatkin , James Morris , "Serge E. Hallyn" , David Howells , David Woodhouse , Jessica Yu , Rusty Russell , Herbert Xu , "David S. Miller" , "AKASHI, Takahiro" , Thiago Jung Bauermann To: linux-security-module@vger.kernel.org Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:41036 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752926AbdGFWS5 (ORCPT ); Thu, 6 Jul 2017 18:18:57 -0400 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v66MIj2F066850 for ; Thu, 6 Jul 2017 18:18:56 -0400 Received: from e24smtp04.br.ibm.com (e24smtp04.br.ibm.com [32.104.18.25]) by mx0a-001b2d01.pphosted.com with ESMTP id 2bhuuqv96x-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 06 Jul 2017 18:18:56 -0400 Received: from localhost by e24smtp04.br.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 6 Jul 2017 19:18:53 -0300 In-Reply-To: <20170706221753.17380-1-bauerman@linux.vnet.ibm.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: When module-style signatures appended at the end of files are supported for IMA appraisal, the code will fallback to the xattr signature if the appended one fails to verify. The problem is that we don't know whether we need to fallback to the xattr signature until the appraise step, and by then the measure step was already completed and would need to be done again in case the template includes the signature. To avoid this problem, do the appraisal first so that the correct signature is stored by the template in the measure step. Signed-off-by: Thiago Jung Bauermann --- security/integrity/ima/ima_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 2aebb7984437..0b4845e7248d 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -244,12 +244,12 @@ static int process_measurement(struct file *file, char *buf, loff_t size, if (!pathbuf) /* ima_rdwr_violation possibly pre-fetched */ pathname = ima_d_path(&file->f_path, &pathbuf, filename); - if (action & IMA_MEASURE) - ima_store_measurement(iint, file, pathname, - xattr_value, xattr_len, pcr); if (action & IMA_APPRAISE_SUBMASK) rc = ima_appraise_measurement(func, iint, file, pathname, xattr_value, xattr_len, opened); + if (action & IMA_MEASURE) + ima_store_measurement(iint, file, pathname, + xattr_value, xattr_len, pcr); if (action & IMA_AUDIT) ima_audit_measurement(iint, pathname); -- 2.13.0