From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751580AbdEBMdv (ORCPT ); Tue, 2 May 2017 08:33:51 -0400 Received: from lhrrgout.huawei.com ([194.213.3.17]:25482 "EHLO lhrrgout.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750951AbdEBMdt (ORCPT ); Tue, 2 May 2017 08:33:49 -0400 From: Roberto Sassu To: CC: , , , Roberto Sassu Subject: [PATCH 3/3] tpm: move TPM 1.2 code of tpm_pcr_extend() to tpm1_pcr_extend() Date: Tue, 2 May 2017 14:31:51 +0200 Message-ID: <20170502123151.24354-4-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170502123151.24354-1-roberto.sassu@huawei.com> References: <20170502123151.24354-1-roberto.sassu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.204.66.1] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.59087CAB.018F,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: 03d0f5078c3fed46ba5ee73a22265fb1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In preparation of the modifications to tpm_pcr_extend(), which will allow callers to supply a digest for each PCR bank of a TPM 2.0, the TPM 1.2 specific code has been moved to tpm1_pcr_extend(). tpm1_pcr_extend() uses tpm_buf_init() to prepare the command buffer, which offers protection against buffer overflow. It is called by tpm_pcr_extend() and tpm_pm_suspend(). Signed-off-by: Roberto Sassu --- drivers/char/tpm/tpm-interface.c | 46 +++++++++++++++++++++------------------- 1 file changed, 24 insertions(+), 22 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 5c2c032..9059f67 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -763,11 +763,25 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read); #define EXTEND_PCR_RESULT_SIZE 34 #define EXTEND_PCR_RESULT_BODY_SIZE 20 -static const struct tpm_input_header pcrextend_header = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .length = cpu_to_be32(34), - .ordinal = cpu_to_be32(TPM_ORD_PCREXTEND) -}; + +static int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash, + char *log_msg) +{ + struct tpm_buf buf; + int rc; + + rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCREXTEND); + if (rc) + return rc; + + tpm_buf_append_u32(&buf, pcr_idx); + tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE); + + rc = tpm_transmit_cmd(chip, buf.data, EXTEND_PCR_RESULT_SIZE, + EXTEND_PCR_RESULT_BODY_SIZE, 0, log_msg); + tpm_buf_destroy(&buf); + return rc; +} /** * tpm_pcr_extend - extend pcr value with hash @@ -781,7 +795,6 @@ static const struct tpm_input_header pcrextend_header = { */ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) { - struct tpm_cmd_t cmd; int rc; struct tpm_chip *chip; struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)]; @@ -807,13 +820,8 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) return rc; } - cmd.header.in = pcrextend_header; - cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); - memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE); - rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, - EXTEND_PCR_RESULT_BODY_SIZE, 0, - "attempting extend a PCR value"); - + rc = tpm1_pcr_extend(chip, pcr_idx, hash, + "attempting extend a PCR value"); tpm_put_ops(chip); return rc; } @@ -1011,15 +1019,9 @@ int tpm_pm_suspend(struct device *dev) } /* for buggy tpm, flush pcrs with extend to selected dummy */ - if (tpm_suspend_pcr) { - cmd.header.in = pcrextend_header; - cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr); - memcpy(cmd.params.pcrextend_in.hash, dummy_hash, - TPM_DIGEST_SIZE); - rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, - EXTEND_PCR_RESULT_BODY_SIZE, 0, - "extending dummy pcr before suspend"); - } + if (tpm_suspend_pcr) + rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash, + "extending dummy pcr before suspend"); /* now do the actual savestate */ for (try = 0; try < TPM_RETRY; try++) { -- 2.9.3