From patchwork Mon Oct 29 13:50:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 10659315 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 D8CB714E2 for ; Mon, 29 Oct 2018 13:50:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C7CEC298ED for ; Mon, 29 Oct 2018 13:50:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C5F9929964; Mon, 29 Oct 2018 13:50:40 +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 23C48298ED for ; Mon, 29 Oct 2018 13:50:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726701AbeJ2WjX (ORCPT ); Mon, 29 Oct 2018 18:39:23 -0400 Received: from mga18.intel.com ([134.134.136.126]:15087 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726692AbeJ2WjX (ORCPT ); Mon, 29 Oct 2018 18:39:23 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Oct 2018 06:50:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,440,1534834800"; d="scan'208";a="103447155" Received: from jsakkine-mobl1.tm.intel.com (HELO localhost) ([10.237.50.111]) by fmsmga001.fm.intel.com with ESMTP; 29 Oct 2018 06:50:35 -0700 From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org, Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] tpm: clean up tpm_try_transmit() error handling flow Date: Mon, 29 Oct 2018 15:50:18 +0200 Message-Id: <20181029135018.25547-1-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Move locking, locality handling and power management to tpm_transmit() in order to simplify the flow and fix the error message formatting in tpm_try_transmit() to output correct function name by using the '__func__' macro. Cc: Peter Huewe Cc: Jason Gunthorpe Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 103 ++++++++++++++----------------- 1 file changed, 47 insertions(+), 56 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 64510ed81b46..967de254b156 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -171,7 +171,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, ssize_t len = 0; u32 count, ordinal; unsigned long stop; - bool need_locality; rc = tpm_validate_command(chip, space, buf, bufsiz); if (rc == -EINVAL) @@ -201,37 +200,16 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, return -E2BIG; } - if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED)) - mutex_lock(&chip->tpm_mutex); - - if (chip->ops->clk_enable != NULL) - chip->ops->clk_enable(chip, true); - - /* Store the decision as chip->locality will be changed. */ - need_locality = chip->locality == -1; - - if (need_locality) { - rc = tpm_request_locality(chip, flags); - if (rc < 0) { - need_locality = false; - goto out_locality; - } - } - - rc = tpm_cmd_ready(chip, flags); - if (rc) - goto out_locality; - rc = tpm2_prepare_space(chip, space, ordinal, buf); if (rc) - goto out; + return rc; rc = chip->ops->send(chip, buf, count); if (rc < 0) { if (rc != -EPIPE) dev_err(&chip->dev, "%s: tpm_send: error %d\n", __func__, rc); - goto out; + return rc; } if (chip->flags & TPM_CHIP_FLAG_IRQ) @@ -246,8 +224,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, if (chip->ops->req_canceled(chip, status)) { dev_err(&chip->dev, "Operation Canceled\n"); - rc = -ECANCELED; - goto out; + return -ECANCELED; } tpm_msleep(TPM_TIMEOUT_POLL); @@ -256,44 +233,24 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, chip->ops->cancel(chip); dev_err(&chip->dev, "Operation Timed out\n"); - rc = -ETIME; - goto out; + return -ETIME; out_recv: len = chip->ops->recv(chip, buf, bufsiz); if (len < 0) { - rc = len; - dev_err(&chip->dev, - "tpm_transmit: tpm_recv: error %d\n", rc); - goto out; - } else if (len < TPM_HEADER_SIZE) { - rc = -EFAULT; - goto out; - } - - if (len != be32_to_cpu(header->length)) { - rc = -EFAULT; - goto out; + dev_err(&chip->dev, "%s: recv error %d\n", __func__, rc); + return len; } + if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length)) + return -EFAULT; rc = tpm2_commit_space(chip, space, ordinal, buf, &len); - if (rc) - dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc); - -out: - /* may fail but do not override previous error value in rc */ - tpm_go_idle(chip, flags); - -out_locality: - if (need_locality) - tpm_relinquish_locality(chip, flags); - - if (chip->ops->clk_enable != NULL) - chip->ops->clk_enable(chip, false); + if (rc) { + dev_err(&chip->dev, "%s: commit error %d\n", __func__, rc); + return rc; + } - if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED)) - mutex_unlock(&chip->tpm_mutex); - return rc ? rc : len; + return len; } /** @@ -322,6 +279,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, /* space for header and handles */ u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)]; unsigned int delay_msec = TPM2_DURATION_SHORT; + bool has_locality = false; u32 rc = 0; ssize_t ret; const size_t save_size = min(space ? sizeof(save) : TPM_HEADER_SIZE, @@ -337,7 +295,40 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, memcpy(save, buf, save_size); for (;;) { + if (!(flags & TPM_TRANSMIT_UNLOCKED) && + !(flags & TPM_TRANSMIT_NESTED)) + mutex_lock(&chip->tpm_mutex); + + if (chip->ops->clk_enable != NULL) + chip->ops->clk_enable(chip, true); + + if (chip->locality == -1) { + ret = tpm_request_locality(chip, flags); + if (ret) + goto out_locality; + has_locality = true; + } + + ret = tpm_cmd_ready(chip, flags); + if (ret) + goto out_locality; + ret = tpm_try_transmit(chip, space, buf, bufsiz, flags); + + /* This may fail but do not override ret. */ + tpm_go_idle(chip, flags); + +out_locality: + if (has_locality) + tpm_relinquish_locality(chip, flags); + + if (chip->ops->clk_enable != NULL) + chip->ops->clk_enable(chip, false); + + if (!(flags & TPM_TRANSMIT_UNLOCKED) && + !(flags & TPM_TRANSMIT_NESTED)) + mutex_unlock(&chip->tpm_mutex); + if (ret < 0) break; rc = be32_to_cpu(header->return_code);