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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 74495C2BB55 for ; Thu, 16 Apr 2020 13:55:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 489032076D for ; Thu, 16 Apr 2020 13:55:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045339; bh=6H1V2cPpME8yyZYSE40VWtVW+9eZQ/zpTdh4A8UwM1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MgK+Sigf2cNvD2zyBkA+FkO32SBF+E06ZfZZjlYZpFU5aKTIu/bz/gQ3qq8QpvmEK FqIFUXpzi/2TveeTa8tTEuIT2nH/xSrgzqH9DH/FT7LrGd36xBvTA4bkaHifY0OuFv zyW54umVVqh67mXKqPzu2TFUHW2eaXJod5+G6Uso= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392465AbgDPNzg (ORCPT ); Thu, 16 Apr 2020 09:55:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:50858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897689AbgDPNiY (ORCPT ); Thu, 16 Apr 2020 09:38:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 617FC22203; Thu, 16 Apr 2020 13:38:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044303; bh=6H1V2cPpME8yyZYSE40VWtVW+9eZQ/zpTdh4A8UwM1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uhdM0fdH7rygOpl4+EqTJCDVPCA2ZP3Bx3ATafVZXF02vXJm0Y+1aqZxeV2gxNqSX T4Ty6CxCVoKjDkp0FJE6rQ5vQIMUHYfHxhdtjDB1GhaqZujUOHZyqVqy2YIa7bRUjm nfdw9OJdmqA83J/pUvz6KOZ0LeWMTeQqhRUFnZOk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vasily Averin , Jarkko Sakkinen Subject: [PATCH 5.5 122/257] tpm: tpm2_bios_measurements_next should increase position index Date: Thu, 16 Apr 2020 15:22:53 +0200 Message-Id: <20200416131341.565617325@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vasily Averin commit f9bf8adb55cd5a357b247a16aafddf8c97b276e0 upstream. If .next function does not change position index, following .show function will repeat output related to current position index. For /sys/kernel/security/tpm0/binary_bios_measurements: 1) read after lseek beyound end of file generates whole last line. 2) read after lseek to middle of last line generates expected end of last line and unexpected whole last line once again. Cc: stable@vger.kernel.org # 4.19.x Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code ...") Link: https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- drivers/char/tpm/eventlog/tpm2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/char/tpm/eventlog/tpm2.c +++ b/drivers/char/tpm/eventlog/tpm2.c @@ -94,6 +94,7 @@ static void *tpm2_bios_measurements_next size_t event_size; void *marker; + (*pos)++; event_header = log->bios_event_log; if (v == SEQ_START_TOKEN) { @@ -118,7 +119,6 @@ static void *tpm2_bios_measurements_next if (((v + event_size) >= limit) || (event_size == 0)) return NULL; - (*pos)++; return v; }