From patchwork Fri Aug 25 17:29:46 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 9922555 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 A5D7A602BD for ; Fri, 25 Aug 2017 17:29:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8E00A2841C for ; Fri, 25 Aug 2017 17:29:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7F8BE28421; Fri, 25 Aug 2017 17:29:58 +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 973652841C for ; Fri, 25 Aug 2017 17:29:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755648AbdHYR34 (ORCPT ); Fri, 25 Aug 2017 13:29:56 -0400 Received: from mga11.intel.com ([192.55.52.93]:51756 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754737AbdHYR3z (ORCPT ); Fri, 25 Aug 2017 13:29:55 -0400 Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Aug 2017 10:29:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.41,426,1498546800"; d="scan'208";a="122612444" Received: from janlundk-mobl1.ger.corp.intel.com (HELO localhost) ([10.249.254.252]) by orsmga004.jf.intel.com with ESMTP; 25 Aug 2017 10:29:51 -0700 From: Jarkko Sakkinen To: tpmdd-devel@lists.sourceforge.net Cc: linux-security-module@vger.kernel.org, Jarkko Sakkinen , Peter Huewe , Marcel Selhorst , Jason Gunthorpe , linux-kernel@vger.kernel.org (open list) Subject: [PATCH RESEND] tpm: migrate pubek_show to struct tpm_buf Date: Fri, 25 Aug 2017 20:29:46 +0300 Message-Id: <20170825172946.18357-1-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.14.1 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Migrated pubek_show to struct tpm_buf and cleaned up its implementation. Previously the output parameter structure was declared but left completely unused. Now it is used to refer different fields of the output. We can move it to tpm-sysfs.c as it does not have any use outside of that file. Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-sysfs.c | 87 ++++++++++++++++++++++++-------------------- drivers/char/tpm/tpm.h | 13 ------- 2 files changed, 48 insertions(+), 52 deletions(-) diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 86f38d239476..83a77a445538 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -20,44 +20,48 @@ #include #include "tpm.h" -#define READ_PUBEK_RESULT_SIZE 314 +struct tpm_readpubek_out { + u8 algorithm[4]; + u8 encscheme[2]; + u8 sigscheme[2]; + __be32 paramsize; + u8 parameters[12]; + __be32 keysize; + u8 modulus[256]; + u8 checksum[20]; +} __packed; + #define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256) #define TPM_ORD_READPUBEK 124 -static const struct tpm_input_header tpm_readpubek_header = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .length = cpu_to_be32(30), - .ordinal = cpu_to_be32(TPM_ORD_READPUBEK) -}; + static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, char *buf) { - u8 *data; - struct tpm_cmd_t tpm_cmd; - ssize_t err; - int i, rc; + struct tpm_buf tpm_buf; + struct tpm_readpubek_out *out; + ssize_t rc; + int i; char *str = buf; struct tpm_chip *chip = to_tpm_chip(dev); + char anti_replay[20]; - memset(&tpm_cmd, 0, sizeof(tpm_cmd)); - - tpm_cmd.header.in = tpm_readpubek_header; - err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE, - READ_PUBEK_RESULT_MIN_BODY_SIZE, 0, - "attempting to read the PUBEK"); - if (err) - goto out; - - /* - ignore header 10 bytes - algorithm 32 bits (1 == RSA ) - encscheme 16 bits - sigscheme 16 bits - parameters (RSA 12->bytes: keybit, #primes, expbit) - keylenbytes 32 bits - 256 byte modulus - ignore checksum 20 bytes - */ - data = tpm_cmd.params.readpubek_out_buffer; + memset(&anti_replay, 0, sizeof(anti_replay)); + + rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK); + if (rc) + return rc; + + tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay)); + + rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE, + READ_PUBEK_RESULT_MIN_BODY_SIZE, 0, + "attempting to read the PUBEK"); + if (rc) { + tpm_buf_destroy(&tpm_buf); + return 0; + } + + out = (struct tpm_readpubek_out *)&tpm_buf.data[10]; str += sprintf(str, "Algorithm: %02X %02X %02X %02X\n" @@ -68,21 +72,26 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, "%02X %02X %02X %02X\n" "Modulus length: %d\n" "Modulus:\n", - data[0], data[1], data[2], data[3], - data[4], data[5], - data[6], data[7], - data[12], data[13], data[14], data[15], - data[16], data[17], data[18], data[19], - data[20], data[21], data[22], data[23], - be32_to_cpu(*((__be32 *) (data + 24)))); + out->algorithm[0], out->algorithm[1], out->algorithm[2], + out->algorithm[3], + out->encscheme[0], out->encscheme[1], + out->sigscheme[0], out->sigscheme[1], + out->parameters[0], out->parameters[1], + out->parameters[2], out->parameters[3], + out->parameters[4], out->parameters[5], + out->parameters[6], out->parameters[7], + out->parameters[8], out->parameters[9], + out->parameters[10], out->parameters[11], + be32_to_cpu(out->keysize)); for (i = 0; i < 256; i++) { - str += sprintf(str, "%02X ", data[i + 28]); + str += sprintf(str, "%02X ", out->modulus[i]); if ((i + 1) % 16 == 0) str += sprintf(str, "\n"); } -out: + rc = str - buf; + tpm_buf_destroy(&tpm_buf); return rc; } static DEVICE_ATTR_RO(pubek); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 2d5466a72e40..b50e92fbca31 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -345,17 +345,6 @@ enum tpm_sub_capabilities { TPM_CAP_PROP_TIS_DURATION = 0x120, }; -struct tpm_readpubek_params_out { - u8 algorithm[4]; - u8 encscheme[2]; - u8 sigscheme[2]; - __be32 paramsize; - u8 parameters[12]; /*assuming RSA*/ - __be32 keysize; - u8 modulus[256]; - u8 checksum[20]; -} __packed; - typedef union { struct tpm_input_header in; struct tpm_output_header out; @@ -385,8 +374,6 @@ struct tpm_getrandom_in { } __packed; typedef union { - struct tpm_readpubek_params_out readpubek_out; - u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)]; struct tpm_pcrread_in pcrread_in; struct tpm_pcrread_out pcrread_out; struct tpm_getrandom_in getrandom_in;