From patchwork Mon Sep 27 15:28:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Konstantin Komarov X-Patchwork-Id: 12520215 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5479CC433F5 for ; Mon, 27 Sep 2021 15:28:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3CE5A60E94 for ; Mon, 27 Sep 2021 15:28:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235214AbhI0PaS (ORCPT ); Mon, 27 Sep 2021 11:30:18 -0400 Received: from relayfre-01.paragon-software.com ([176.12.100.13]:43694 "EHLO relayfre-01.paragon-software.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235071AbhI0PaS (ORCPT ); Mon, 27 Sep 2021 11:30:18 -0400 Received: from dlg2.mail.paragon-software.com (vdlg-exch-02.paragon-software.com [172.30.1.105]) by relayfre-01.paragon-software.com (Postfix) with ESMTPS id 90253120; Mon, 27 Sep 2021 18:28:38 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=paragon-software.com; s=mail; t=1632756518; bh=/GLfucSb/Sznl52QhhJWbQFctZyCuqIOx1lDQdsbhy8=; h=Date:Subject:From:To:CC:References:In-Reply-To; b=qO0DaUQz6matQ6vYUnWvjMVfMEKWJeXhMMCETSbwpjGTqIZAW5f3xHkio+4cq7J30 T+wUomyAhT2ME51zz+dj38Mf4YFNk5STlQR/mt/ygk+1Sd9jXyB2bJVdIG6nXTjHeX TTzY4QQ21ZNYkSEO9V+SJAQuQXX+tEy4zEqUjqAc= Received: from [192.168.211.27] (192.168.211.27) by vdlg-exch-02.paragon-software.com (172.30.1.105) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Mon, 27 Sep 2021 18:28:38 +0300 Message-ID: Date: Mon, 27 Sep 2021 18:28:37 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.1 Subject: [PATCH v2 3/3] fs/ntfs3: Refactoring of ntfs_set_ea Content-Language: en-US From: Konstantin Komarov To: CC: , References: In-Reply-To: X-Originating-IP: [192.168.211.27] X-ClientProxiedBy: vdlg-exch-02.paragon-software.com (172.30.1.105) To vdlg-exch-02.paragon-software.com (172.30.1.105) Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Make code more readable. Don't try to read zero bytes. Add warning when size of exteneded attribute exceeds limit. Thanks Joe Perches for help. Signed-off-by: Konstantin Komarov --- fs/ntfs3/xattr.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c index 1ab109723b10..5023d6f7e671 100644 --- a/fs/ntfs3/xattr.c +++ b/fs/ntfs3/xattr.c @@ -75,6 +75,7 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea, size_t add_bytes, const struct EA_INFO **info) { int err; + struct ntfs_sb_info *sbi = ni->mi.sbi; struct ATTR_LIST_ENTRY *le = NULL; struct ATTRIB *attr_info, *attr_ea; void *ea_p; @@ -99,10 +100,10 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea, /* Check Ea limit. */ size = le32_to_cpu((*info)->size); - if (size > ni->mi.sbi->ea_max_size) + if (size > sbi->ea_max_size) return -EFBIG; - if (attr_size(attr_ea) > ni->mi.sbi->ea_max_size) + if (attr_size(attr_ea) > sbi->ea_max_size) return -EFBIG; /* Allocate memory for packed Ea. */ @@ -110,15 +111,16 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea, if (!ea_p) return -ENOMEM; - if (attr_ea->non_res) { + if (!size) { + ; + } else if (attr_ea->non_res) { struct runs_tree run; run_init(&run); err = attr_load_runs(attr_ea, ni, &run, NULL); if (!err) - err = ntfs_read_run_nb(ni->mi.sbi, &run, 0, ea_p, size, - NULL); + err = ntfs_read_run_nb(sbi, &run, 0, ea_p, size, NULL); run_close(&run); if (err) @@ -366,21 +368,22 @@ static noinline int ntfs_set_ea(struct inode *inode, const char *name, new_ea->name[name_len] = 0; memcpy(new_ea->name + name_len + 1, value, val_size); new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); - - /* Should fit into 16 bits. */ - if (new_pack > 0xffff) { - err = -EFBIG; // -EINVAL? - goto out; - } ea_info.size_pack = cpu_to_le16(new_pack); - /* New size of ATTR_EA. */ size += add; - if (size > sbi->ea_max_size) { + ea_info.size = cpu_to_le32(size); + + /* + * 1. Check ea_info.size_pack for overflow. + * 2. New attibute size must fit value from $AttrDef + */ + if (new_pack > 0xffff || size > sbi->ea_max_size) { + ntfs_inode_warn( + inode, + "The size of extended attributes must not exceed 64KiB"); err = -EFBIG; // -EINVAL? goto out; } - ea_info.size = cpu_to_le32(size); update_ea: