From patchwork Fri Oct 1 12:04:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ralph Boehme X-Patchwork-Id: 1535300 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (3072-bit key; secure) header.d=samba.org header.i=@samba.org header.a=rsa-sha256 header.s=42 header.b=3VNnWHTf; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-cifs-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HLTMh4nVcz9sR4 for ; Fri, 1 Oct 2021 22:05:36 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354279AbhJAMHS (ORCPT ); Fri, 1 Oct 2021 08:07:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354260AbhJAMHS (ORCPT ); Fri, 1 Oct 2021 08:07:18 -0400 Received: from hr2.samba.org (hr2.samba.org [IPv6:2a01:4f8:192:486::2:0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31C60C061775 for ; Fri, 1 Oct 2021 05:05:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=samba.org; s=42; h=Message-Id:Date:Cc:To:From; bh=0wG96b4CKA2dsAk/FrmfxEHkdb05j2n9a3MKTC2204s=; b=3VNnWHTfDcbEfpXvet3Xx4W4Cb BtTyTmCUoC09Fap64tV/kNIRG6kSFsX9pS9IAVR9x6De11cOWMtH0K9hbM7nBS/SJdLm3IcEbsZGO n9Sv4Rgl7yBsaQQUoEFGlcyyUM2Pw5Eh+M1dPkr/qsnUD206ZL67V0qpqEIK1QDNKEIugzooxZQDs qjX+TIqtKMYrsXXtBKvIaan5pE2YO4vFyUAtATat5YlggUJCSJoM/E0ELtIDN6AAFJWxGikja7Zkr 73JTdWVWwgljywuAD7MLdZi5TIfB05A9a0Kw9z3ZHE8mPRzCJfYWyGvFgJcEZoS0474Utncmb0NmT GiHEjrxFJ/lFSRX3+LQGsKgadZlJ8OznovZn58kDfzXn9dlGMliLaArUAYRpH02TAAZMX8H/R4byc buylB0b3nILBpmFeVQhPmQrdjzhScIntNyVL8EuJ57aD7qMIVbZ9UmiklPRMeRHxEFbzohdUHpdDK q2TIU47AhVYrpxrd3i5fAwHm; Received: from [127.0.0.2] (localhost [127.0.0.1]) by hr2.samba.org with esmtpsa (TLS1.3:ECDHE_SECP256R1__ECDSA_SECP256R1_SHA256__CHACHA20_POLY1305:256) (Exim) id 1mWHIB-0013Z3-Gh; Fri, 01 Oct 2021 12:05:31 +0000 From: Ralph Boehme To: linux-cifs@vger.kernel.org Cc: Namjae Jeon , Tom Talpey , Ronnie Sahlberg , =?utf-8?q?Ralph_B=C3=B6hme?= , Steve French , Sergey Senozhatsky , Hyunchul Lee Subject: [PATCH v5 01/20] ksmbd: add the check to vaildate if stream protocol length exceeds maximum value Date: Fri, 1 Oct 2021 14:04:02 +0200 Message-Id: <20211001120421.327245-2-slow@samba.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211001120421.327245-1-slow@samba.org> References: <20211001120421.327245-1-slow@samba.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org From: Namjae Jeon This patch add MAX_STREAM_PROT_LEN macro and check if stream protocol length exceeds maximum value. opencode pdu size check in ksmbd_pdu_size_has_room(). Cc: Tom Talpey Cc: Ronnie Sahlberg Cc: Ralph Böhme Cc: Steve French Cc: Sergey Senozhatsky Acked-by: Hyunchul Lee Signed-off-by: Namjae Jeon --- fs/ksmbd/connection.c | 9 +++++---- fs/ksmbd/smb_common.c | 6 ------ fs/ksmbd/smb_common.h | 4 ++-- 3 files changed, 7 insertions(+), 12 deletions(-) diff --git a/fs/ksmbd/connection.c b/fs/ksmbd/connection.c index af086d35398a..e50353c50661 100644 --- a/fs/ksmbd/connection.c +++ b/fs/ksmbd/connection.c @@ -296,10 +296,11 @@ int ksmbd_conn_handler_loop(void *p) pdu_size = get_rfc1002_len(hdr_buf); ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size); - /* make sure we have enough to get to SMB header end */ - if (!ksmbd_pdu_size_has_room(pdu_size)) { - ksmbd_debug(CONN, "SMB request too short (%u bytes)\n", - pdu_size); + /* + * Check if pdu size is valid (min : smb header size, + * max : 0x00FFFFFF). + */ + if (pdu_size > MAX_STREAM_PROT_LEN) { continue; } diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c index 5901b2884c60..20bd5b8e3c0a 100644 --- a/fs/ksmbd/smb_common.c +++ b/fs/ksmbd/smb_common.c @@ -21,7 +21,6 @@ static const char basechars[43] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%"; #define MAGIC_CHAR '~' #define PERIOD '.' #define mangle(V) ((char)(basechars[(V) % MANGLE_BASE])) -#define KSMBD_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb2_hdr)) struct smb_protocol { int index; @@ -272,11 +271,6 @@ int ksmbd_init_smb_server(struct ksmbd_work *work) return 0; } -bool ksmbd_pdu_size_has_room(unsigned int pdu) -{ - return (pdu >= KSMBD_MIN_SUPPORTED_HEADER_SIZE - 4); -} - int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level, struct ksmbd_file *dir, struct ksmbd_dir_info *d_info, diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h index 994abede27e9..6e79e7577f6b 100644 --- a/fs/ksmbd/smb_common.h +++ b/fs/ksmbd/smb_common.h @@ -48,6 +48,8 @@ #define CIFS_DEFAULT_IOSIZE (64 * 1024) #define MAX_CIFS_SMALL_BUFFER_SIZE 448 /* big enough for most */ +#define MAX_STREAM_PROT_LEN 0x00FFFFFF + /* Responses when opening a file. */ #define F_SUPERSEDED 0 #define F_OPENED 1 @@ -493,8 +495,6 @@ int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count); int ksmbd_init_smb_server(struct ksmbd_work *work); -bool ksmbd_pdu_size_has_room(unsigned int pdu); - struct ksmbd_kstat; int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,