From patchwork Thu Nov 8 14:15:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 10674279 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1DE5014D6 for ; Thu, 8 Nov 2018 14:16:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0EF292C0FA for ; Thu, 8 Nov 2018 14:16:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 02CBF2DBDF; Thu, 8 Nov 2018 14:16:16 +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=unavailable 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 9BD2A2DBBB for ; Thu, 8 Nov 2018 14:16:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726509AbeKHXv4 (ORCPT ); Thu, 8 Nov 2018 18:51:56 -0500 Received: from mga18.intel.com ([134.134.136.126]:56438 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726359AbeKHXv4 (ORCPT ); Thu, 8 Nov 2018 18:51:56 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Nov 2018 06:16:15 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,478,1534834800"; d="scan'208";a="94663787" Received: from ibanaga-mobl1.ger.corp.intel.com (HELO localhost) ([10.249.254.75]) by FMSMGA003.fm.intel.com with ESMTP; 08 Nov 2018 06:16:09 -0800 From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org, James Bottomley , Tomas Winkler , Tadeusz Struk , Stefan Berger , Nayna Jain , Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 03/17] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Date: Thu, 8 Nov 2018 16:15:24 +0200 Message-Id: <20181108141541.12832-4-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181108141541.12832-1-jarkko.sakkinen@linux.intel.com> References: <20181108141541.12832-1-jarkko.sakkinen@linux.intel.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Do not print partial list of PCRs when tpm1_pcr_read() fails but instead return 0 from pcrs_show(). This is consistent behavior with other sysfs functions. Signed-off-by: Jarkko Sakkinen Reviewed-by: Stefan Berger --- drivers/char/tpm/tpm-sysfs.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 7ed7eb6f906a..928d4e839bb7 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -100,22 +100,21 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr, { cap_t cap; u8 digest[TPM_DIGEST_SIZE]; - ssize_t rc; u32 i, j, num_pcrs; char *str = buf; struct tpm_chip *chip = to_tpm_chip(dev); - rc = tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap, - "attempting to determine the number of PCRS", - sizeof(cap.num_pcrs)); - if (rc) + if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap, + "attempting to determine the number of PCRS", + sizeof(cap.num_pcrs))) return 0; num_pcrs = be32_to_cpu(cap.num_pcrs); for (i = 0; i < num_pcrs; i++) { - rc = tpm1_pcr_read(chip, i, digest); - if (rc) + if (tpm1_pcr_read(chip, i, digest)) { + str = buf; break; + } str += sprintf(str, "PCR-%02d: ", i); for (j = 0; j < TPM_DIGEST_SIZE; j++) str += sprintf(str, "%02X ", digest[j]);