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=-8.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 86669C433E4 for ; Thu, 16 Jul 2020 21:10:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65E34207DD for ; Thu, 16 Jul 2020 21:10:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726069AbgGPVKR (ORCPT ); Thu, 16 Jul 2020 17:10:17 -0400 Received: from www62.your-server.de ([213.133.104.62]:56408 "EHLO www62.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725999AbgGPVKR (ORCPT ); Thu, 16 Jul 2020 17:10:17 -0400 Received: from sslproxy02.your-server.de ([78.47.166.47]) by www62.your-server.de with esmtpsa (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1jwB8r-0004lK-OJ; Thu, 16 Jul 2020 23:10:09 +0200 Received: from [178.196.57.75] (helo=pc-9.home) by sslproxy02.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jwB8r-000F2V-IH; Thu, 16 Jul 2020 23:10:09 +0200 Subject: Re: [PATCH bpf-next 2/5] bpf: allow for tailcalls in BPF subprograms To: Maciej Fijalkowski , ast@kernel.org Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, bjorn.topel@intel.com, magnus.karlsson@intel.com References: <20200715233634.3868-1-maciej.fijalkowski@intel.com> <20200715233634.3868-3-maciej.fijalkowski@intel.com> From: Daniel Borkmann Message-ID: Date: Thu, 16 Jul 2020 23:10:09 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20200715233634.3868-3-maciej.fijalkowski@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Authenticated-Sender: daniel@iogearbox.net X-Virus-Scanned: Clear (ClamAV 0.102.3/25875/Thu Jul 16 16:46:30 2020) Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On 7/16/20 1:36 AM, Maciej Fijalkowski wrote: > Relax verifier's restriction that was meant to forbid tailcall usage > when subprog count was higher than 1. > > Also, do not max out the stack depth of program that utilizes tailcalls. > > Signed-off-by: Maciej Fijalkowski [nit: this patch also needs reordering]