From patchwork Mon Jun 6 10:17:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kinga Tanska X-Patchwork-Id: 12870223 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65F31C433EF for ; Mon, 6 Jun 2022 10:14:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233678AbiFFKOe (ORCPT ); Mon, 6 Jun 2022 06:14:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233941AbiFFKOS (ORCPT ); Mon, 6 Jun 2022 06:14:18 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B96D133258 for ; Mon, 6 Jun 2022 03:11:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654510290; x=1686046290; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=kM1cwh3kbV0HqDlgH5s7Pnc2onmq1byYL2sLWfBSlTM=; b=mtxIjMONppl024qNAa9b0hPFq6BBYVqerAj3yQBz9a8KTJyT32e0WIPa kgFnWiOytE24clFdc32pPlsKyFp74aA/9h37JvnXe9wBSzicZTBXRVgT8 wC+9NuB7Ac4bw15/4I1bFNDVjp5eyseIiXu1Etca4zcwfnlf+6KNZy2EG YU3/zC6MdfVkwal/MicY66IVYTjAvB/Zg2QsTSi6co3F1mq0K1+VcVvq/ Xe6Emmmw02MHBMfHb80hfIA2Iyc3OX5egCcan1ThfxxxdyvXKW69v2C8/ BaX3N7i2reYv3i3MrSPt2clPGdYvtplKGu5GnwIFihSrI1IqSq0omyhXT Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10369"; a="274180200" X-IronPort-AV: E=Sophos;i="5.91,280,1647327600"; d="scan'208";a="274180200" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jun 2022 03:11:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,280,1647327600"; d="scan'208";a="682189052" Received: from unknown (HELO localhost.igk.intel.com) ([10.102.102.97]) by fmsmga002.fm.intel.com with ESMTP; 06 Jun 2022 03:11:28 -0700 From: Kinga Tanska To: linux-raid@vger.kernel.org Cc: jes@trained-monkey.org, colyli@suse.de, pmenzel@molgen.mpg.de Subject: [PATCH v3 1/2] Mdmonitor: Fix segfault Date: Mon, 6 Jun 2022 12:17:14 +0200 Message-Id: <20220606101715.11433-2-kinga.tanska@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20220606101715.11433-1-kinga.tanska@intel.com> References: <20220606101715.11433-1-kinga.tanska@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Mdadm with "--monitor" parameter requires md device as an argument to be monitored. If given argument is not a md device, error shall be returned. Previously it was not checked and invalid argument caused segmentation fault. This commit adds checking that devices passed to mdmonitor are md devices. Change-Id: I6726aeeaa7b46fe8f46cbc6108f0406e0c756ad0 Signed-off-by: Kinga Tanska --- Monitor.c | 10 +++++++++- mdadm.h | 1 + mdopen.c | 17 +++++++++++++++++ 3 files changed, 27 insertions(+), 1 deletion(-) diff --git a/Monitor.c b/Monitor.c index f5412299..3d0c147a 100644 --- a/Monitor.c +++ b/Monitor.c @@ -183,6 +183,7 @@ int Monitor(struct mddev_dev *devlist, continue; if (strcasecmp(mdlist->devname, "") == 0) continue; + st = xcalloc(1, sizeof *st); if (mdlist->devname[0] == '/') st->devname = xstrdup(mdlist->devname); @@ -191,6 +192,8 @@ int Monitor(struct mddev_dev *devlist, strcpy(strcpy(st->devname, "/dev/md/"), mdlist->devname); } + if (!is_mddev(mdlist->devname)) + return 1; st->next = statelist; st->devnm[0] = 0; st->percent = RESYNC_UNKNOWN; @@ -204,7 +207,12 @@ int Monitor(struct mddev_dev *devlist, struct mddev_dev *dv; for (dv = devlist; dv; dv = dv->next) { - struct state *st = xcalloc(1, sizeof *st); + struct state *st; + + if (!is_mddev(dv->devname)) + return 1; + + st = xcalloc(1, sizeof *st); mdlist = conf_get_ident(dv->devname); st->devname = xstrdup(dv->devname); st->next = statelist; diff --git a/mdadm.h b/mdadm.h index 8f8841d8..03151c34 100644 --- a/mdadm.h +++ b/mdadm.h @@ -1607,6 +1607,7 @@ extern int create_mddev(char *dev, char *name, int autof, int trustworthy, #define FOREIGN 2 #define METADATA 3 extern int open_mddev(char *dev, int report_errors); +extern int is_mddev(char *dev); extern int open_container(int fd); extern int metadata_container_matches(char *metadata, char *devnm); extern int metadata_subdev_matches(char *metadata, char *devnm); diff --git a/mdopen.c b/mdopen.c index 245be537..d18c9319 100644 --- a/mdopen.c +++ b/mdopen.c @@ -475,6 +475,23 @@ int open_mddev(char *dev, int report_errors) return mdfd; } +/** + * is_mddev() - check that file name passed is an md device. + * @dev: file name that has to be checked. + * Return: 1 if file passed is an md device, 0 if not. + */ +int is_mddev(char *dev) +{ + int fd = open_mddev(dev, 1); + + if (fd >= 0) { + close(fd); + return 1; + } + + return 0; +} + char *find_free_devnm(int use_partitions) { static char devnm[32];