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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,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 ED663C43461 for ; Mon, 19 Apr 2021 15:02:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D012C6101C for ; Mon, 19 Apr 2021 15:02:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239586AbhDSPCa (ORCPT ); Mon, 19 Apr 2021 11:02:30 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:20630 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239230AbhDSPCa (ORCPT ); Mon, 19 Apr 2021 11:02:30 -0400 Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13JEXaLH031502 for ; Mon, 19 Apr 2021 11:02:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=56W0iEdGubB1+U29sYehFG0HtKMZrA9aSiTRV+T4vVg=; b=bYTgXYf52FkLSQT3fdvik1n86bbAJkMewyvW67M/M5nn+S4gSNuYFt9s+J/wFZveOADY TQ2eBamMSPU8KJK2fCemD4ImQxYHeEi5Ro5MimchU3vJzxp6X4Dn79qyF0/x/f9ttl8E /Hf8PQfBCeIZmXv3mxuoy+gVoezykybpg2BOJoxPnK3g5OYtvJw80t7EIHLEO4gwpFw3 ZG8ozVkSHTTavzkeMmwpKAmsyIBcWY7oS4yZfu5RqJfpXozMFQlM3NX4FsXU7Oycu1u/ UErGUlNJjg7nAnEdgk12+g5iL8r/E9IMLZInkbWEllH9e73PxuEUCh4YFSk/61sgSMiI nw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 380cwxv9yu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 19 Apr 2021 11:01:59 -0400 Received: from m0127361.ppops.net (m0127361.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 13JEXeLC032097 for ; Mon, 19 Apr 2021 11:01:59 -0400 Received: from ppma05wdc.us.ibm.com (1b.90.2fa9.ip4.static.sl-reverse.com [169.47.144.27]) by mx0a-001b2d01.pphosted.com with ESMTP id 380cwxv9xr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 19 Apr 2021 11:01:59 -0400 Received: from pps.filterd (ppma05wdc.us.ibm.com [127.0.0.1]) by ppma05wdc.us.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13JEqgJd014062; Mon, 19 Apr 2021 15:01:58 GMT Received: from b03cxnp08026.gho.boulder.ibm.com (b03cxnp08026.gho.boulder.ibm.com [9.17.130.18]) by ppma05wdc.us.ibm.com with ESMTP id 37yqa8tr55-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 19 Apr 2021 15:01:58 +0000 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13JF1vWL21758428 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Apr 2021 15:01:57 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2B214136051; Mon, 19 Apr 2021 15:01:57 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BB457136055; Mon, 19 Apr 2021 15:01:56 +0000 (GMT) Received: from localhost.localdomain (unknown [9.47.158.155]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 19 Apr 2021 15:01:56 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, Stefan Berger Subject: [PATCH 3/6] libimaevm: Rename variable returned from readlink to len Date: Mon, 19 Apr 2021 11:01:48 -0400 Message-Id: <20210419150151.236409-4-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210419150151.236409-1-stefanb@linux.ibm.com> References: <20210419150151.236409-1-stefanb@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: e_TsLhLG3rHxPmLX-fRjd1oZJUwXq5f6 X-Proofpoint-GUID: e_yB8I6lqTBOenZnZOAbYLRyn-oDys2D X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-19_10:2021-04-19,2021-04-19 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 malwarescore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104190100 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org The variable returned from readlink is a length indicator of the number of bytes placed into a buffer, not only an error. Leave a note in the code that a zero-length link is also treated as an error, besdies the usual -1. Signed-off-by: Stefan Berger --- src/libimaevm.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/src/libimaevm.c b/src/libimaevm.c index 0137884..9a6739b 100644 --- a/src/libimaevm.c +++ b/src/libimaevm.c @@ -213,15 +213,16 @@ static int add_dir_hash(const char *file, EVP_MD_CTX *ctx) static int add_link_hash(const char *path, EVP_MD_CTX *ctx) { - int err; + int len; char buf[1024]; - err = readlink(path, buf, sizeof(buf)); - if (err <= 0) + len = readlink(path, buf, sizeof(buf)); + /* 0-length links are also an error */ + if (len <= 0) return -1; - log_info("link: %s -> %.*s\n", path, err, buf); - return !EVP_DigestUpdate(ctx, buf, err); + log_info("link: %s -> %.*s\n", path, len, buf); + return !EVP_DigestUpdate(ctx, buf, len); } static int add_dev_hash(struct stat *st, EVP_MD_CTX *ctx) -- 2.30.2