From patchwork Wed Jun 9 13:26:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 12310107 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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 6AD80C48BDF for ; Wed, 9 Jun 2021 13:26:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38424613B8 for ; Wed, 9 Jun 2021 13:26:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236388AbhFIN2U (ORCPT ); Wed, 9 Jun 2021 09:28:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:44032 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232946AbhFIN2U (ORCPT ); Wed, 9 Jun 2021 09:28:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1CB31613AE; Wed, 9 Jun 2021 13:26:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623245185; bh=szkmgf2zz14SCvlEGt46o1NLfvJbSEwtD4TkOmAowYU=; h=From:To:Cc:Subject:Date:From; b=se8StkjQwiJAZBzBDDeMVE7E3x1Y6MHeX44ztPnGN52jxo5vWIMYXGmapgxymaYxL FIavw3NvoHvAXfFj/S96ZuFO+woO+heY5rsLJDd/1jCDXSRSNnC7sxnLsOYxHHMX+g H8YXxReoPlq4ot8AVWh1o3u85FRhKsegtVm/V+LPbT4zXIm5/66OMm02x9ldFK0AoR RJVUu1C+/f8JH822joi156XN1hJKbLKFTWRjg5W/w9trfNz1Jg/+0cZ7tk61lpMP9x 4rLPglT+BcbzQ2UYc4ZJDh0h7w5rhY8nYrV9sKvh9Vxhud3soJ5XmNg3wkI6T7KXVF f19kjbjZFjuMw== From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: Jarkko Sakkinen , stable@vger.kernel.org, Hans de Goede , Greg KH , Peter Huewe , Jason Gunthorpe , James Bottomley Subject: [PATCH v3] tpm: Replace WARN_ONCE() with dev_err_once() in tpm_tis_status() Date: Wed, 9 Jun 2021 16:26:19 +0300 Message-Id: <20210609132619.45017-1-jarkko@kernel.org> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Do not tear down the system when getting invalid status from a TPM chip. This can happen when panic-on-warn is used. Instead, introduce TPM_TIS_INVALID_STATUS bitflag and use it to trigger once the error reporting per chip. In addition, print out the value of TPM_STS for improved forensics. Link: https://lore.kernel.org/keyrings/YKzlTR1AzUigShtZ@kroah.com/ Fixes: 55707d531af6 ("tpm_tis: Add a check for invalid status") Cc: stable@vger.kernel.org Cc: Hans de Goede Cc: Greg KH Signed-off-by: Jarkko Sakkinen Reviewed-by: Greg Kroah-Hartman --- v3: * torn -> tear * A per chip flag TPM_TIS_INVALID_STATUS. v2: Dump also stack only once. drivers/char/tpm/tpm_tis_core.c | 25 ++++++++++++++++++------- drivers/char/tpm/tpm_tis_core.h | 3 ++- 2 files changed, 20 insertions(+), 8 deletions(-) diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 55b9d3965ae1..69579efb247b 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -196,13 +196,24 @@ static u8 tpm_tis_status(struct tpm_chip *chip) return 0; if (unlikely((status & TPM_STS_READ_ZERO) != 0)) { - /* - * If this trips, the chances are the read is - * returning 0xff because the locality hasn't been - * acquired. Usually because tpm_try_get_ops() hasn't - * been called before doing a TPM operation. - */ - WARN_ONCE(1, "TPM returned invalid status\n"); + if (!test_and_set_bit(TPM_TIS_INVALID_STATUS, &priv->flags)) { + /* + * If this trips, the chances are the read is + * returning 0xff because the locality hasn't been + * acquired. Usually because tpm_try_get_ops() hasn't + * been called before doing a TPM operation. + */ + dev_err(&chip->dev, "invalid TPM_STS.x 0x%02x, dumping stack for forensics\n", + status); + + /* + * Dump stack for forensics, as invalid TPM_STS.x could be + * potentially triggered by impaired tpm_try_get_ops() or + * tpm_find_get_ops(). + */ + dump_stack(); + } + return 0; } diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h index 9b2d32a59f67..b2a3c6c72882 100644 --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -83,6 +83,7 @@ enum tis_defaults { enum tpm_tis_flags { TPM_TIS_ITPM_WORKAROUND = BIT(0), + TPM_TIS_INVALID_STATUS = BIT(1), }; struct tpm_tis_data { @@ -90,7 +91,7 @@ struct tpm_tis_data { int locality; int irq; bool irq_tested; - unsigned int flags; + unsigned long flags; void __iomem *ilb_base_addr; u16 clkrun_enabled; wait_queue_head_t int_queue;