From patchwork Wed Apr 25 10:44:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 10362445 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 BCFA7601D3 for ; Wed, 25 Apr 2018 10:47:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AD1C7223C7 for ; Wed, 25 Apr 2018 10:47:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A01432625B; Wed, 25 Apr 2018 10:47:46 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, 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 1C2A3223C7 for ; Wed, 25 Apr 2018 10:47:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754295AbeDYKrB (ORCPT ); Wed, 25 Apr 2018 06:47:01 -0400 Received: from mga11.intel.com ([192.55.52.93]:41831 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754452AbeDYKo5 (ORCPT ); Wed, 25 Apr 2018 06:44:57 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Apr 2018 03:44:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,326,1520924400"; d="scan'208";a="223203204" Received: from kfrandsx-mobl.ger.corp.intel.com (HELO localhost) ([10.249.254.142]) by fmsmga005.fm.intel.com with ESMTP; 25 Apr 2018 03:44:52 -0700 From: Jarkko Sakkinen To: stable@vger.kernel.org Cc: James Bottomley , Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , linux-integrity@vger.kernel.org (open list:TPM DEVICE DRIVER), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 3/3] tpm: add retry logic Date: Wed, 25 Apr 2018 13:44:23 +0300 Message-Id: <20180425104425.5803-4-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180425104425.5803-1-jarkko.sakkinen@linux.intel.com> References: <20180425104425.5803-1-jarkko.sakkinen@linux.intel.com> MIME-Version: 1.0 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: James Bottomley commit e2fb992d82c626c43ed0566e07c410e56a087af3 upstream TPM2 can return TPM2_RC_RETRY to any command and when it does we get unexpected failures inside the kernel that surprise users (this is mostly observed in the trusted key handling code). The UEFI 2.6 spec has advice on how to handle this: The firmware SHALL not return TPM2_RC_RETRY prior to the completion of the call to ExitBootServices(). Implementer’s Note: the implementation of this function should check the return value in the TPM response and, if it is TPM2_RC_RETRY, resend the command. The implementation may abort if a sufficient number of retries has been done. So we follow that advice in our tpm_transmit() code using TPM2_DURATION_SHORT as the initial wait duration and TPM2_DURATION_LONG as the maximum wait time. This should fix all the in-kernel use cases and also means that user space TSS implementations don't have to have their own retry handling. Signed-off-by: James Bottomley Cc: stable@vger.kernel.org Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 75 +++++++++++++++++++++++++------- drivers/char/tpm/tpm.h | 1 + 2 files changed, 61 insertions(+), 15 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index f71352cf7552..255db6fe15c8 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -399,21 +399,10 @@ static void tpm_relinquish_locality(struct tpm_chip *chip) chip->locality = -1; } -/** - * tpm_transmit - Internal kernel interface to transmit TPM commands. - * - * @chip: TPM chip to use - * @space: tpm space - * @buf: TPM command buffer - * @bufsiz: length of the TPM command buffer - * @flags: tpm transmit flags - bitmap - * - * Return: - * 0 when the operation is successful. - * A negative number for system errors (errno). - */ -ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, - u8 *buf, size_t bufsiz, unsigned int flags) +static ssize_t tpm_try_transmit(struct tpm_chip *chip, + struct tpm_space *space, + u8 *buf, size_t bufsiz, + unsigned int flags) { struct tpm_output_header *header = (void *)buf; int rc; @@ -544,6 +533,62 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, return rc ? rc : len; } +/** + * tpm_transmit - Internal kernel interface to transmit TPM commands. + * + * @chip: TPM chip to use + * @space: tpm space + * @buf: TPM command buffer + * @bufsiz: length of the TPM command buffer + * @flags: tpm transmit flags - bitmap + * + * A wrapper around tpm_try_transmit that handles TPM2_RC_RETRY + * returns from the TPM and retransmits the command after a delay up + * to a maximum wait of TPM2_DURATION_LONG. + * + * Note: TPM1 never returns TPM2_RC_RETRY so the retry logic is TPM2 + * only + * + * Return: + * the length of the return when the operation is successful. + * A negative number for system errors (errno). + */ +ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, + u8 *buf, size_t bufsiz, unsigned int flags) +{ + struct tpm_output_header *header = (struct tpm_output_header *)buf; + /* space for header and handles */ + u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)]; + unsigned int delay_msec = TPM2_DURATION_SHORT; + u32 rc = 0; + ssize_t ret; + const size_t save_size = min(space ? sizeof(save) : TPM_HEADER_SIZE, + bufsiz); + + /* + * Subtlety here: if we have a space, the handles will be + * transformed, so when we restore the header we also have to + * restore the handles. + */ + memcpy(save, buf, save_size); + + for (;;) { + ret = tpm_try_transmit(chip, space, buf, bufsiz, flags); + if (ret < 0) + break; + rc = be32_to_cpu(header->return_code); + if (rc != TPM2_RC_RETRY) + break; + delay_msec *= 2; + if (delay_msec > TPM2_DURATION_LONG) { + dev_err(&chip->dev, "TPM is in retry loop\n"); + break; + } + tpm_msleep(delay_msec); + memcpy(buf, save, save_size); + } + return ret; +} /** * tpm_transmit_cmd - send a tpm command to the device * The function extracts tpm out header return code diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index f895fba4e20d..d73f3fb81b42 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -108,6 +108,7 @@ enum tpm2_return_codes { TPM2_RC_COMMAND_CODE = 0x0143, TPM2_RC_TESTING = 0x090A, /* RC_WARN */ TPM2_RC_REFERENCE_H0 = 0x0910, + TPM2_RC_RETRY = 0x0922, }; enum tpm2_algorithms {