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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 531CFC3279B for ; Mon, 2 Jul 2018 17:00:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 190D924FBF for ; Mon, 2 Jul 2018 17:00:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 190D924FBF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752326AbeGBRAu (ORCPT ); Mon, 2 Jul 2018 13:00:50 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:55226 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753135AbeGBRAr (ORCPT ); Mon, 2 Jul 2018 13:00:47 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w62GwoMG146861 for ; Mon, 2 Jul 2018 13:00:47 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2jyqv70j8w-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 02 Jul 2018 13:00:46 -0400 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 2 Jul 2018 18:00:41 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w62H0eQA38338738 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 2 Jul 2018 17:00:40 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2D9B5A405D; Mon, 2 Jul 2018 18:00:23 +0100 (BST) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 746D0A405F; Mon, 2 Jul 2018 18:00:22 +0100 (BST) Received: from dhcp-9-31-103-18.watson.ibm.com (unknown [9.31.103.18]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 2 Jul 2018 18:00:22 +0100 (BST) Subject: Re: [PATCH] ima: Use tpm_default_chip() and call TPM functions with a tpm_chip From: Mimi Zohar To: Stefan Berger , linux-integrity@vger.kernel.org, jarkko.sakkinen@linux.intel.com Cc: jgg@ziepe.ca, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Date: Mon, 02 Jul 2018 13:00:39 -0400 In-Reply-To: <20180702152449.3219288-1-stefanb@linux.vnet.ibm.com> References: <20180702152449.3219288-1-stefanb@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.20.5 (3.20.5-1.fc24) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 18070217-4275-0000-0000-000002945630 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18070217-4276-0000-0000-0000379BD0E7 Message-Id: <1530550839.3709.46.camel@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-07-02_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1807020190 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2018-07-02 at 11:24 -0400, Stefan Berger wrote: > Rather than accessing the TPM functions by passing a NULL pointer for > the tpm_chip, which causes a lookup for a suitable chip every time, get a > hold of a tpm_chip and access the TPM functions using it. Also get rid of > the ima_used_chip variable and use the new ima_tpm_chip variable instead > for determining whether to call TPM functions. > > Signed-off-by: Stefan Berger > Acked-by: Jarkko Sakkinen Signed-off-by: Mimi Zohar Jarkko, would you mind staging this patch with the rest of the patch set? Mimi > --- > security/integrity/ima/ima.h | 2 +- > security/integrity/ima/ima_crypto.c | 4 ++-- > security/integrity/ima/ima_init.c | 16 +++++----------- > security/integrity/ima/ima_queue.c | 4 ++-- > 4 files changed, 10 insertions(+), 16 deletions(-) > > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h > index 354bb5716ce3..2ab1affffa36 100644 > --- a/security/integrity/ima/ima.h > +++ b/security/integrity/ima/ima.h > @@ -53,9 +53,9 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; > extern int ima_policy_flag; > > /* set during initialization */ > -extern int ima_used_chip; > extern int ima_hash_algo; > extern int ima_appraise; > +extern struct tpm_chip *ima_tpm_chip; > > /* IMA event related data */ > struct ima_event_data { > diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c > index 4e085a17124f..7e7e7e7c250a 100644 > --- a/security/integrity/ima/ima_crypto.c > +++ b/security/integrity/ima/ima_crypto.c > @@ -631,10 +631,10 @@ int ima_calc_buffer_hash(const void *buf, loff_t len, > > static void __init ima_pcrread(int idx, u8 *pcr) > { > - if (!ima_used_chip) > + if (!ima_tpm_chip) > return; > > - if (tpm_pcr_read(NULL, idx, pcr) != 0) > + if (tpm_pcr_read(ima_tpm_chip, idx, pcr) != 0) > pr_err("Error Communicating to TPM chip\n"); > } > > diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c > index 29b72cd2502e..faac9ecaa0ae 100644 > --- a/security/integrity/ima/ima_init.c > +++ b/security/integrity/ima/ima_init.c > @@ -26,7 +26,7 @@ > > /* name for boot aggregate entry */ > static const char *boot_aggregate_name = "boot_aggregate"; > -int ima_used_chip; > +struct tpm_chip *ima_tpm_chip; > > /* Add the boot aggregate to the IMA measurement list and extend > * the PCR register. > @@ -64,7 +64,7 @@ static int __init ima_add_boot_aggregate(void) > iint->ima_hash->algo = HASH_ALGO_SHA1; > iint->ima_hash->length = SHA1_DIGEST_SIZE; > > - if (ima_used_chip) { > + if (ima_tpm_chip) { > result = ima_calc_boot_aggregate(&hash.hdr); > if (result < 0) { > audit_cause = "hashing_error"; > @@ -106,17 +106,11 @@ void __init ima_load_x509(void) > > int __init ima_init(void) > { > - u8 pcr_i[TPM_DIGEST_SIZE]; > int rc; > > - ima_used_chip = 0; > - rc = tpm_pcr_read(NULL, 0, pcr_i); > - if (rc == 0) > - ima_used_chip = 1; > - > - if (!ima_used_chip) > - pr_info("No TPM chip found, activating TPM-bypass! (rc=%d)\n", > - rc); > + ima_tpm_chip = tpm_default_chip(); > + if (!ima_tpm_chip) > + pr_info("No TPM chip found, activating TPM-bypass!\n"); > > rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA); > if (rc) > diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c > index 418f35e38015..b186819bd5aa 100644 > --- a/security/integrity/ima/ima_queue.c > +++ b/security/integrity/ima/ima_queue.c > @@ -142,10 +142,10 @@ static int ima_pcr_extend(const u8 *hash, int pcr) > { > int result = 0; > > - if (!ima_used_chip) > + if (!ima_tpm_chip) > return result; > > - result = tpm_pcr_extend(NULL, pcr, hash); > + result = tpm_pcr_extend(ima_tpm_chip, pcr, hash); > if (result != 0) > pr_err("Error Communicating to TPM chip, result: %d\n", result); > return result;