Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752748AbdFUOem (ORCPT ); Wed, 21 Jun 2017 10:34:42 -0400 Received: from lhrrgout.huawei.com ([194.213.3.17]:29084 "EHLO lhrrgout.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751754AbdFUOeB (ORCPT ); Wed, 21 Jun 2017 10:34:01 -0400 From: Roberto Sassu To: CC: , , , , Roberto Sassu Subject: [PATCH v3 2/6] tpm: use tpm2_pcr_read_tpm_buf() in tpm2_do_selftest() Date: Wed, 21 Jun 2017 16:29:37 +0200 Message-ID: <20170621142941.32674-3-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170621142941.32674-1-roberto.sassu@huawei.com> References: <20170621142941.32674-1-roberto.sassu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.204.65.245] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.594A83D2.0037,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 527658e6d560d149f313f893834e2b96 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2413 Lines: 72 tpm2_do_selftest() performs a PCR read during the TPM initialization phase. This patch replaces the PCR read code with a call to tpm2_pcr_read_tpm_buf(). tpm2_do_selftest() parses the result of the TPM command, in order to retrieve the return code. Signed-off-by: Roberto Sassu --- drivers/char/tpm/tpm2-cmd.c | 32 ++++++++++---------------------- 1 file changed, 10 insertions(+), 22 deletions(-) diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index afd1b63..6a9fe0d 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -227,16 +227,6 @@ static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = { TPM_UNDEFINED /* 18f */ }; -#define TPM2_PCR_READ_IN_SIZE \ - (sizeof(struct tpm_input_header) + \ - sizeof(struct tpm2_pcr_read_in)) - -static const struct tpm_input_header tpm2_pcrread_header = { - .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), - .length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE), - .ordinal = cpu_to_be32(TPM2_CC_PCR_READ) -}; - static int tpm2_pcr_read_tpm_buf(struct tpm_chip *chip, int pcr_idx, enum tpm2_algorithms algo, struct tpm_buf *buf, char *msg) @@ -938,7 +928,8 @@ static int tpm2_do_selftest(struct tpm_chip *chip) unsigned int loops; unsigned int delay_msec = 100; unsigned long duration; - struct tpm2_cmd cmd; + struct tpm_buf buf; + tpm_cmd_header *header; int i; duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST); @@ -951,20 +942,17 @@ static int tpm2_do_selftest(struct tpm_chip *chip) for (i = 0; i < loops; i++) { /* Attempt to read a PCR value */ - cmd.header.in = tpm2_pcrread_header; - cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1); - cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); - cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN; - cmd.params.pcrread_in.pcr_select[0] = 0x01; - cmd.params.pcrread_in.pcr_select[1] = 0x00; - cmd.params.pcrread_in.pcr_select[2] = 0x00; - - rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0, - NULL); + rc = tpm2_pcr_read_tpm_buf(chip, 0, TPM2_ALG_SHA1, &buf, NULL); + if (rc >= 0) { + header = (tpm_cmd_header *)buf.data; + rc = be32_to_cpu(header->out.return_code); + } + + tpm_buf_destroy(&buf); + if (rc < 0) break; - rc = be32_to_cpu(cmd.header.out.return_code); if (rc != TPM2_RC_TESTING) break; -- 2.9.3