From patchwork Tue Apr 4 14:29:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Disseldorp X-Patchwork-Id: 13200278 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 2B2EAC6FD1D for ; Tue, 4 Apr 2023 14:28:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235260AbjDDO2e (ORCPT ); Tue, 4 Apr 2023 10:28:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234708AbjDDO2c (ORCPT ); Tue, 4 Apr 2023 10:28:32 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B93183C3B for ; Tue, 4 Apr 2023 07:28:30 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 6878122B86; Tue, 4 Apr 2023 14:28:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1680618509; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=xoiIRBI1cUQuhJ+FkZwTAQX7Cgm/rRMtWuRbUMfYxJw=; b=O0Cmo7O8TxixhAuNgd1ng7cAX+yx/Fe7DwG6zMkNUghf3YY0OZQ5mveMDTkL2jhpBoJ/SD N3MxD6gI4YU9djYeO5XZVs6IhrysG2eeS++HIiOJ1FruCYYP3hhzig1HHhQ5GAEboOvNqQ vhmHi04M1EJ5WWhsId3G5cWrWxPrR1s= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1680618509; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=xoiIRBI1cUQuhJ+FkZwTAQX7Cgm/rRMtWuRbUMfYxJw=; b=dDmB0VivILYB2tCxlcqf0ygDdyYyKW4zduEQ49lo2p8Fo+Ic8Okxoq2jGXO9/USxFeP+68 i1oAb29jiSSg9CCw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 3F2A91391A; Tue, 4 Apr 2023 14:28:29 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id GvPiDQ00LGRGZQAAMHmgww (envelope-from ); Tue, 04 Apr 2023 14:28:29 +0000 From: David Disseldorp To: Namjae Jeon Cc: Ronnie Sahlberg , linux-cifs@vger.kernel.org, David Disseldorp Subject: [PATCH v2] ksmbd: remove unused compression negotiate ctx packing Date: Tue, 4 Apr 2023 16:29:54 +0200 Message-Id: <20230404142954.26674-1-ddiss@suse.de> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org build_compression_ctxt() is currently unreachable due to conn.compress_algorithm remaining zero (SMB3_COMPRESS_NONE). It appears to have been broken in a couple of subtle ways over the years: - prior to d6c9ad23b421 ("ksmbd: use the common definitions for NEGOTIATE_PROTOCOL") smb2_compression_ctx.DataLength was set to 8, which didn't account for the single CompressionAlgorithms flexible array member. - post d6c9ad23b421 smb2_compression_capabilities_context CompressionAlgorithms is a three member array, while CompressionAlgorithmCount is set to indicate only one member. assemble_neg_contexts() ctxt_size is also incorrectly incremented by sizeof(struct smb2_compression_capabilities_context) + 2, which assumes one flexible array member. Signed-off-by: David Disseldorp Acked-by: Namjae Jeon --- v2: update changelog to also mention incorrect ctxt_size increment. Note: this applies atop my previous assemble_neg_contexts cleanups ksmbd: set NegotiateContextCount once instead of every inc ksmbd: avoid duplicate negotiate ctx offset increments fs/ksmbd/smb2pdu.c | 26 ++------------------------ 1 file changed, 2 insertions(+), 24 deletions(-) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 9416c766483e..6dbc2300bd2a 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -747,19 +747,6 @@ static void build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt, pneg_ctxt->Ciphers[0] = cipher_type; } -static void build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt, - __le16 comp_algo) -{ - pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES; - pneg_ctxt->DataLength = - cpu_to_le16(sizeof(struct smb2_compression_capabilities_context) - - sizeof(struct smb2_neg_context)); - pneg_ctxt->Reserved = cpu_to_le32(0); - pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(1); - pneg_ctxt->Flags = cpu_to_le32(0); - pneg_ctxt->CompressionAlgorithms[0] = comp_algo; -} - static void build_sign_cap_ctxt(struct smb2_signing_capabilities *pneg_ctxt, __le16 sign_algo) { @@ -823,17 +810,8 @@ static void assemble_neg_contexts(struct ksmbd_conn *conn, ctxt_size += sizeof(struct smb2_encryption_neg_context) + 2; } - if (conn->compress_algorithm) { - ctxt_size = round_up(ctxt_size, 8); - ksmbd_debug(SMB, - "assemble SMB2_COMPRESSION_CAPABILITIES context\n"); - /* Temporarily set to SMB3_COMPRESS_NONE */ - build_compression_ctxt((struct smb2_compression_capabilities_context *) - (pneg_ctxt + ctxt_size), - conn->compress_algorithm); - neg_ctxt_cnt++; - ctxt_size += sizeof(struct smb2_compression_capabilities_context) + 2; - } + /* compression context not yet supported */ + WARN_ON(conn->compress_algorithm != SMB3_COMPRESS_NONE); if (conn->posix_ext_supported) { ctxt_size = round_up(ctxt_size, 8);