From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E126C433F5 for ; Mon, 13 Sep 2021 13:36:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08042619E4 for ; Mon, 13 Sep 2021 13:36:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242801AbhIMNhX (ORCPT ); Mon, 13 Sep 2021 09:37:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:60032 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241729AbhIMNbw (ORCPT ); Mon, 13 Sep 2021 09:31:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8E42E61362; Mon, 13 Sep 2021 13:25:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631539534; bh=/u+Ho3eMoIK64CllGtyLRMWiqn7k0ejvmVrCM8klB9M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YWP/RiraE+5Nkd/o6++df2coNiMfcHLZeE1c1cA/IZi3gEYxjH8fgONvmV+M/zu57 pArS3pghFrcSSdsmfhAJKo8IheEujwa+Nk6DlB5UZOVYEM+NzV/sBidRfGbk3KrUG+ DVLhOsq0eS8nC8oNhe4CsbS+UzDp3iME4AAIP+ps= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nayna Jain , George Wilson , Nageswara R Sastry , Stefan Berger , Jarkko Sakkinen , Sasha Levin Subject: [PATCH 5.10 060/236] tpm: ibmvtpm: Avoid error message when process gets signal while waiting Date: Mon, 13 Sep 2021 15:12:45 +0200 Message-Id: <20210913131102.410748782@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131100.316353015@linuxfoundation.org> References: <20210913131100.316353015@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stefan Berger [ Upstream commit 047d4226b0bca1cda5267dc68bc8291cce5364ac ] When rngd is run as root then lots of these types of message will appear in the kernel log if the TPM has been configured to provide random bytes: [ 7406.275163] tpm tpm0: tpm_transmit: tpm_recv: error -4 The issue is caused by the following call that is interrupted while waiting for the TPM's response. sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd); Rather than waiting for the response in the low level driver, have it use the polling loop in tpm_try_transmit() that uses a command's duration to poll until a result has been returned by the TPM, thus ending when the timeout has occurred but not responding to signals and ctrl-c anymore. To stay in this polling loop extend tpm_ibmvtpm_status() to return 'true' for as long as the vTPM is indicated as being busy in tpm_processing_cmd. Since the loop requires the TPM's timeouts, get them now using tpm_get_timeouts() after setting the TPM2 version flag on the chip. To recreat the resolved issue start rngd like this: sudo rngd -r /dev/hwrng -t sudo rngd -r /dev/tpm0 -t Link: https://bugzilla.redhat.com/show_bug.cgi?id=1981473 Fixes: 6674ff145eef ("tpm_ibmvtpm: properly handle interrupted packet receptions") Cc: Nayna Jain Cc: George Wilson Reported-by: Nageswara R Sastry Signed-off-by: Stefan Berger Tested-by: Nageswara R Sastry Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Sasha Levin --- drivers/char/tpm/tpm_ibmvtpm.c | 26 +++++++++++++++----------- drivers/char/tpm/tpm_ibmvtpm.h | 2 +- 2 files changed, 16 insertions(+), 12 deletions(-) diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c index 994385bf37c0..3ca7528322f5 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.c +++ b/drivers/char/tpm/tpm_ibmvtpm.c @@ -106,17 +106,12 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) { struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); u16 len; - int sig; if (!ibmvtpm->rtce_buf) { dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); return 0; } - sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd); - if (sig) - return -EINTR; - len = ibmvtpm->res_len; if (count < len) { @@ -237,7 +232,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) * set the processing flag before the Hcall, since we may get the * result (interrupt) before even being able to check rc. */ - ibmvtpm->tpm_processing_cmd = true; + ibmvtpm->tpm_processing_cmd = 1; again: rc = ibmvtpm_send_crq(ibmvtpm->vdev, @@ -255,7 +250,7 @@ again: goto again; } dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc); - ibmvtpm->tpm_processing_cmd = false; + ibmvtpm->tpm_processing_cmd = 0; } spin_unlock(&ibmvtpm->rtce_lock); @@ -269,7 +264,9 @@ static void tpm_ibmvtpm_cancel(struct tpm_chip *chip) static u8 tpm_ibmvtpm_status(struct tpm_chip *chip) { - return 0; + struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); + + return ibmvtpm->tpm_processing_cmd; } /** @@ -459,7 +456,7 @@ static const struct tpm_class_ops tpm_ibmvtpm = { .send = tpm_ibmvtpm_send, .cancel = tpm_ibmvtpm_cancel, .status = tpm_ibmvtpm_status, - .req_complete_mask = 0, + .req_complete_mask = 1, .req_complete_val = 0, .req_canceled = tpm_ibmvtpm_req_canceled, }; @@ -552,7 +549,7 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq, case VTPM_TPM_COMMAND_RES: /* len of the data in rtce buffer */ ibmvtpm->res_len = be16_to_cpu(crq->len); - ibmvtpm->tpm_processing_cmd = false; + ibmvtpm->tpm_processing_cmd = 0; wake_up_interruptible(&ibmvtpm->wq); return; default: @@ -690,8 +687,15 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev, goto init_irq_cleanup; } - if (!strcmp(id->compat, "IBM,vtpm20")) { + + if (!strcmp(id->compat, "IBM,vtpm20")) chip->flags |= TPM_CHIP_FLAG_TPM2; + + rc = tpm_get_timeouts(chip); + if (rc) + goto init_irq_cleanup; + + if (chip->flags & TPM_CHIP_FLAG_TPM2) { rc = tpm2_get_cc_attrs_tbl(chip); if (rc) goto init_irq_cleanup; diff --git a/drivers/char/tpm/tpm_ibmvtpm.h b/drivers/char/tpm/tpm_ibmvtpm.h index b92aa7d3e93e..51198b137461 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.h +++ b/drivers/char/tpm/tpm_ibmvtpm.h @@ -41,7 +41,7 @@ struct ibmvtpm_dev { wait_queue_head_t wq; u16 res_len; u32 vtpm_version; - bool tpm_processing_cmd; + u8 tpm_processing_cmd; }; #define CRQ_RES_BUF_SIZE PAGE_SIZE -- 2.30.2