From patchwork Mon Jul 20 12:47:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11673837 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 80D8960D for ; Mon, 20 Jul 2020 12:53:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5FFA722D2C for ; Mon, 20 Jul 2020 12:53:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="HIM07y0S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729260AbgGTMw6 (ORCPT ); Mon, 20 Jul 2020 08:52:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40492 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728487AbgGTMsJ (ORCPT ); Mon, 20 Jul 2020 08:48:09 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7EAE9C0619D4; Mon, 20 Jul 2020 05:48:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=BjAfLkPDE3yZtg4lK7QhOgoW888N1+wDiCi2cbIh45M=; b=HIM07y0S6HWIwmCN7WHloUTyD/ 90NWYxEF7A8OOMt+yg4W0FNSTev46GNQHm0M10gQP0DPfw41j+camChNVNUSzdAS2+W9B6xEJFxj0 4n2KStvYzNC3b3fLRhUHbpg0C1h1bH+rhr3+ykUcvcbFAUG565FRK+y1r6zNQk9xHx3nUtlG0xpfa R4b3lYzoJn2Vsv07mi0Lr720W4t4f2K5zuJDLvkLLB7iLOadFMXPV1+OtITvRH1r7qcG7E4NGoir+ m5wZVdfOiGPje1P9oONZz0Y/9ohF3QfiJ1TkC//hfbo3TJ3Y4xN43vztrFOMr/5DT0r0fJAP1prMs TGHdbaAg==; Received: from [2001:4bb8:105:4a81:2a8f:15b1:2c3:7be7] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jxVCm-0004WM-TP; Mon, 20 Jul 2020 12:47:41 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Alexey Kuznetsov , Hideaki YOSHIFUJI , Eric Dumazet Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org, mptcp@lists.01.org, lvs-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org Subject: [PATCH 01/24] bpfilter: reject kernel addresses Date: Mon, 20 Jul 2020 14:47:14 +0200 Message-Id: <20200720124737.118617-2-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200720124737.118617-1-hch@lst.de> References: <20200720124737.118617-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org When feeding addresses to userspace we can't support kernel addresses that were fed under set_fs(KERNEL_DS) from bpf-cgroup. Signed-off-by: Christoph Hellwig --- net/bpfilter/bpfilter_kern.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index 2c31e82cb953af..977e9dad72ca4f 100644 --- a/net/bpfilter/bpfilter_kern.c +++ b/net/bpfilter/bpfilter_kern.c @@ -41,6 +41,11 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname, ssize_t n; int ret = -EFAULT; + if (uaccess_kernel()) { + pr_err("kernel access not supported\n"); + return -EFAULT; + } + req.is_set = is_set; req.pid = current->pid; req.cmd = optname;