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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 748F7C433EF for ; Tue, 19 Jul 2022 13:03:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239502AbiGSNDv (ORCPT ); Tue, 19 Jul 2022 09:03:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242700AbiGSM71 (ORCPT ); Tue, 19 Jul 2022 08:59:27 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1CF44F680; Tue, 19 Jul 2022 05:24:31 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 6D64BB81B29; Tue, 19 Jul 2022 12:24:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B714C341E1; Tue, 19 Jul 2022 12:24:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658233468; bh=jD3s+6w84cU2Oi8eJMG5lj6xF1TAOiBOrVNqWZW59DI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=w74KDlVI18PGN0iVT9uTpT3ceT9Kl3LJ5b5RSm3GhDceoOaY/KRoqWQM4epUpD1cc pEN2gt2PFCFa94eNGxTueglGh77eoAJHbyUuLpku4KTy+ZrCV541zqWbJV8shC5QAH DL8+2FTxppMeDVB/BteYiHEZTv3Hp2EIx/mfGOwA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julian Sikorski , Julian Sikorski , Shyam Prasad N , Steve French , Sasha Levin Subject: [PATCH 5.18 133/231] smb3: workaround negprot bug in some Samba servers Date: Tue, 19 Jul 2022 13:53:38 +0200 Message-Id: <20220719114725.618451555@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220719114714.247441733@linuxfoundation.org> References: <20220719114714.247441733@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Steve French [ Upstream commit 32f319183c439b239294cb2d70ada3564c4c7c39 ] Mount can now fail to older Samba servers due to a server bug handling padding at the end of the last negotiate context (negotiate contexts typically are rounded up to 8 bytes by adding padding if needed). This server bug can be avoided by switching the order of negotiate contexts, placing a negotiate context at the end that does not require padding (prior to the recent netname context fix this was the case on the client). Fixes: 73130a7b1ac9 ("smb3: fix empty netname context on secondary channels") Reported-by: Julian Sikorski Tested-by: Julian Sikorski Reviewed-by: Shyam Prasad N Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/cifs/smb2pdu.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 6a8a00f28b19..2e6c0f4d8449 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -571,10 +571,6 @@ assemble_neg_contexts(struct smb2_negotiate_req *req, *total_len += ctxt_len; pneg_ctxt += ctxt_len; - build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt); - *total_len += sizeof(struct smb2_posix_neg_context); - pneg_ctxt += sizeof(struct smb2_posix_neg_context); - /* * secondary channels don't have the hostname field populated * use the hostname field in the primary channel instead @@ -586,9 +582,14 @@ assemble_neg_contexts(struct smb2_negotiate_req *req, hostname); *total_len += ctxt_len; pneg_ctxt += ctxt_len; - neg_context_count = 4; - } else /* second channels do not have a hostname */ neg_context_count = 3; + } else + neg_context_count = 2; + + build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt); + *total_len += sizeof(struct smb2_posix_neg_context); + pneg_ctxt += sizeof(struct smb2_posix_neg_context); + neg_context_count++; if (server->compress_algorithm) { build_compression_ctxt((struct smb2_compression_capabilities_context *) -- 2.35.1