From patchwork Thu May 20 09:17:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 444525 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=ham 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 9B55FC43460 for ; Thu, 20 May 2021 09:43:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7814461975 for ; Thu, 20 May 2021 09:43:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233404AbhETJpB (ORCPT ); Thu, 20 May 2021 05:45:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:41906 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233564AbhETJm5 (ORCPT ); Thu, 20 May 2021 05:42:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0DB03613D9; Thu, 20 May 2021 09:32:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503157; bh=CLNenmTL0h3stCXgHi3YgfaI2pJeN5bOqxxcUvBZmAA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VDZTkT/GyHWz74JEEJ5YIv0p0iVy7B4oL0b4g52YUdZlNUqKUljIQqbYAAftUaxyl OLWkuNNYShfCSzw7Zb5ujdPg4u3iufcRcD2nOu8YRYF3VDVgOyYbQFWBhp3WIpx/9b Xkmwl3DNclG131022zjVPKGACLwXQZpWpvEgmh3w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Berger , Jarkko Sakkinen Subject: [PATCH 4.19 094/425] tpm: vtpm_proxy: Avoid reading host log when using a virtual device Date: Thu, 20 May 2021 11:17:43 +0200 Message-Id: <20210520092134.547727177@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092131.308959589@linuxfoundation.org> References: <20210520092131.308959589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Stefan Berger commit 9716ac65efc8f780549b03bddf41e60c445d4709 upstream. Avoid allocating memory and reading the host log when a virtual device is used since this log is of no use to that driver. A virtual device can be identified through the flag TPM_CHIP_FLAG_VIRTUAL, which is only set for the tpm_vtpm_proxy driver. Cc: stable@vger.kernel.org Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs") Signed-off-by: Stefan Berger Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- drivers/char/tpm/eventlog/common.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/char/tpm/eventlog/common.c +++ b/drivers/char/tpm/eventlog/common.c @@ -112,6 +112,9 @@ void tpm_bios_log_setup(struct tpm_chip int log_version; int rc = 0; + if (chip->flags & TPM_CHIP_FLAG_VIRTUAL) + return; + rc = tpm_read_log(chip); if (rc < 0) return;