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 X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B27CCC433ED for ; Mon, 17 May 2021 15:34:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9861F61108 for ; Mon, 17 May 2021 15:34:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243384AbhEQPfj (ORCPT ); Mon, 17 May 2021 11:35:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:55934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244426AbhEQPUj (ORCPT ); Mon, 17 May 2021 11:20:39 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id F313561928; Mon, 17 May 2021 14:34:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621262063; bh=rpSqR4MR4S37JY+TbR1OCsT8vEv9VQu8ZuJfas7Qs2M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZV343FNVo4kxF7y5FgzjVVMb2E79LEcplHAZZWc2WP6TWAwqcU/l4mMUOGUvqgTkO Ih8lqs+NNQ30+lHzpOKebBCBDVWnhczhiCd909ZG/7ro2Qkxr+eyumZgGEOjqJcW5E cUdxe1IrVYfE9wdEt0PEVILKmJYh25Sev01dFXXU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Fastabend , Karsten Graul , Cong Wang , "David S. Miller" , Sasha Levin , syzbot+b54a1ce86ba4a623b7f0@syzkaller.appspotmail.com Subject: [PATCH 5.11 210/329] smc: disallow TCP_ULP in smc_setsockopt() Date: Mon, 17 May 2021 16:02:01 +0200 Message-Id: <20210517140309.243688750@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.043055203@linuxfoundation.org> References: <20210517140302.043055203@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: Cong Wang [ Upstream commit 8621436671f3a4bba5db57482e1ee604708bf1eb ] syzbot is able to setup kTLS on an SMC socket which coincidentally uses sk_user_data too. Later, kTLS treats it as psock so triggers a refcnt warning. The root cause is that smc_setsockopt() simply calls TCP setsockopt() which includes TCP_ULP. I do not think it makes sense to setup kTLS on top of SMC sockets, so we should just disallow this setup. It is hard to find a commit to blame, but we can apply this patch since the beginning of TCP_ULP. Reported-and-tested-by: syzbot+b54a1ce86ba4a623b7f0@syzkaller.appspotmail.com Fixes: 734942cc4ea6 ("tcp: ULP infrastructure") Cc: John Fastabend Signed-off-by: Karsten Graul Signed-off-by: Cong Wang Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/smc/af_smc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 47340b3b514f..cb23cca72c24 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -2162,6 +2162,9 @@ static int smc_setsockopt(struct socket *sock, int level, int optname, struct smc_sock *smc; int val, rc; + if (level == SOL_TCP && optname == TCP_ULP) + return -EOPNOTSUPP; + smc = smc_sk(sk); /* generic setsockopts reaching us here always apply to the @@ -2186,7 +2189,6 @@ static int smc_setsockopt(struct socket *sock, int level, int optname, if (rc || smc->use_fallback) goto out; switch (optname) { - case TCP_ULP: case TCP_FASTOPEN: case TCP_FASTOPEN_CONNECT: case TCP_FASTOPEN_KEY: -- 2.30.2