From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 43996427F89; Sat, 12 Sep 2026 10:16:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789208176; cv=none; b=bPtXv06GvtlJXFtreAKr3Q16D+ncCNWyyAotwfp9v36GtFKDgOmIKs4/+kd4tIuJwVbDf8qrcCzfEu7cdcbvQpgxYI/qarcvrUFGZ/CFa15KZIA3gB+f7GAr1NQ9V2RyzHtBCphonWT00+eq3/C2rtbDJrMRrmTFgeRpBf0rVY8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789208176; c=relaxed/simple; bh=qMqatK73xihFKicj5UlMIq65FkfakV5tG18Rq7cg9NQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NBrAFW1YII/MZEmgs9J9VorV/G0t0VLBq3Nquq3c7akiTapgaDIxbE/vak/ZVXWRj6Axbtv6TiX64aBoYuSiKbCermQqLJ0JQ/3aj1gq5KibUWqgKpPGaYrdyIzl2MPqjshcHVzBLFQTkWHfeG8GUfzyD2N8iNxtqmBng124zqg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QEt7SBoa; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QEt7SBoa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F345B1F000FF; Sat, 12 Sep 2026 10:16:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789208174; bh=p3kQkr3E11Y3xMTqpixokzmhNvLouzQ1T793W0D7CAs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QEt7SBoaHtDvYGCNsY2rb+U+BkEyOVlqxkoWa7PRX4v4O0gN40xljBqDTKaqWlggC vfAMk0dhf3PE2VPK/thRpNfiONpF2R5i32ETVuWAaHx0NFFejMQjedaZRyAlxDgKwd VlMRa4g28yeRuVIcLdNi/CXToe6j1ps+0402NFbk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiang Mei , Weiming Wu , Konstantin Komarov , Sasha Levin Subject: [PATCH 6.18 0565/1518] fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init Date: Sat, 12 Sep 2026 08:45:34 +0200 Message-ID: <20260912065636.212776657@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065623.398859879@linuxfoundation.org> References: <20260912065623.398859879@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Weiming Wu [ Upstream commit 2064bc663f89e61b8681c1fb9d1ce445de72063d ] ntfs_reparse_init() and ntfs_objid_init() parse the index root of the $Extend/$Reparse and $Extend/$ObjId metafiles (the INDEX_ROOT attributes named $R and $O). They read its type and rule fields through resident_data(), which does not check that the resident attribute is large enough to hold them. mi_enum_attr() accepts a resident attribute with data_off == asize and data_size == 0. For such an attribute placed last in its MFT record, resident_data() returns a pointer to the end of the record_size buffer, so reading root->type / root->rule reads past the allocation. Use resident_data_ex(attr, sizeof(struct INDEX_ROOT)) and bail out when it returns NULL, as ntfs_security_init() already does for $SDH / $SII. The attribute is only parsed while mounting a crafted image, so this needs CAP_SYS_ADMIN. BUG: KASAN: slab-out-of-bounds in ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306) Read of size 4 at addr ffff88801219dc00 by task mount ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306) ntfs_fill_super (fs/ntfs3/super.c:1604) get_tree_bdev_flags (fs/super.c:1703) vfs_get_tree (fs/super.c:1758) path_mount (fs/namespace.c:4131) __x64_sys_mount (fs/namespace.c:4360) Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block") Reported-by: Xiang Mei Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Weiming Wu Signed-off-by: Konstantin Komarov Signed-off-by: Sasha Levin --- fs/ntfs3/fsntfs.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c index 83df92df1ee0c..5e3506815c279 100644 --- a/fs/ntfs3/fsntfs.c +++ b/fs/ntfs3/fsntfs.c @@ -2293,8 +2293,8 @@ int ntfs_reparse_init(struct ntfs_sb_info *sbi) goto out; } - root_r = resident_data(attr); - if (root_r->type != ATTR_ZERO || + root_r = resident_data_ex(attr, sizeof(struct INDEX_ROOT)); + if (!root_r || root_r->type != ATTR_ZERO || root_r->rule != NTFS_COLLATION_TYPE_UINTS) { err = -EINVAL; goto out; @@ -2331,8 +2331,8 @@ int ntfs_objid_init(struct ntfs_sb_info *sbi) goto out; } - root = resident_data(attr); - if (root->type != ATTR_ZERO || + root = resident_data_ex(attr, sizeof(struct INDEX_ROOT)); + if (!root || root->type != ATTR_ZERO || root->rule != NTFS_COLLATION_TYPE_UINTS) { err = -EINVAL; goto out; -- 2.53.0