Received: by 2002:ac0:a582:0:0:0:0:0 with SMTP id m2-v6csp2587927imm; Thu, 11 Oct 2018 12:43:36 -0700 (PDT) X-Google-Smtp-Source: ACcGV60G68qhGlZ1fKjPgagB7SSgrf0wUre8YEVMnnfC7IRQF8TCKXlAGTGGloxSM/LML3kidlui X-Received: by 2002:a65:648f:: with SMTP id e15-v6mr2693598pgv.250.1539287016558; Thu, 11 Oct 2018 12:43:36 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1539287016; cv=none; d=google.com; s=arc-20160816; b=opAtGxmthPGfDEzkxI59gIoZ/yeE9oEKAzAZ1rI/TSkWC08eQR9q5Q1Jt/IFvQYgOO L074Y5BcWfnJSx9uWCeSldc34fmUbHv6d7PKX5BJVLRc0W9wbqSMJyJka/plwbLOZ7Da XNzjndQ10+A/2wcM4MDItJnd0a82gGFbMgcunmF+4MS3sdrmVl6JFupBs3b7/WZbP5pZ dXDZFD7wGSEAlvzeWc2b3sIpOe70jOjb/Km4VwUtBuI9fOiIBe2UefJKyq1zNoQnRZd7 G1wQsnDk1uEpQHwhJvgElVWRu0UJVkQMueMfxL+YoClnMyI640jBrKPcRxYL3nqdPNiI lwfg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=WFF9rb2nS2EMes2gqtYluiuLg/3b51RutEnrkMmhz+8=; b=NHTK89aA83EcgRNIu7BNOqDdBi6SpDsnGGaFarRJ/AxWoMhaILH3ogqhB1bOm9Obp7 1Iiiy0kJp44/r/tD5asbnLIP087EHtl3k22NLcsoLlYf247xV5hdM5ZE367L0iFuCDQY 13P3/5nsvz5hV8hmIyt/6uoYj+8iT0CngFZia4RrMHq6aO2VWxzqVwTNVGpTbPUAfTQF 8G6xFhwhYJZXqNzstHn1I5BDSc3oJSovQa9q3k7cVe+V08PASvx7qjEBs/zSNjPNVkD5 rFuk6N/GLEl/HCPtIJy/UMoXWVdDqrd5Z5bl6C9kUL4eMKA90oU87uXNCKrxxErr1jWq 9meg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a8-v6si27619883plz.170.2018.10.11.12.43.21; Thu, 11 Oct 2018 12:43:36 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726862AbeJLDLU (ORCPT + 99 others); Thu, 11 Oct 2018 23:11:20 -0400 Received: from vapor.isi.edu ([128.9.64.64]:59252 "EHLO vapor.isi.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726054AbeJLDLT (ORCPT ); Thu, 11 Oct 2018 23:11:19 -0400 X-Greylist: delayed 328 seconds by postgrey-1.27 at vger.kernel.org; Thu, 11 Oct 2018 23:11:15 EDT Received: from jib.isi.edu (jib.isi.edu [128.9.136.190]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id w9BJapGT025584; Thu, 11 Oct 2018 12:36:51 -0700 (PDT) Received: by jib.isi.edu (Postfix, from userid 1000) id 9845483C9B; Thu, 11 Oct 2018 12:36:51 -0700 (PDT) Date: Thu, 11 Oct 2018 12:36:51 -0700 From: Craig Milo Rogers To: Alan Cox Cc: hpa@zytor.com, linux-serial@vger.kernel.org, Linux Kernel Mailing List , Greg Kroah-Hartman , Jiri Slaby , Johan Hovold , Alexander Viro Subject: Re: Insanely high baud rates Message-ID: <20181011193651.GA11500@isi.edu> References: <3fcef1c1-d746-ae82-c0e6-f079b1a53ffb@zytor.com> <20181010211717.30c1f052@alans-desktop> <16D6AB22-697E-498C-A5B2-3AD90B567E86@zytor.com> <20181011133134.085624af@alans-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181011133134.085624af@alans-desktop> User-Agent: Mutt/1.5.16 (2007-06-09) X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: rogers@jib.isi.edu Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18.10.11, Alan Cox wrote: > I mean - what is the baud rate of a pty ? Solaris made the distinction between B0, which means pty hangup mode, and any other baud rate: https://docs.oracle.com/cd/E88353_01/html/E37851/pty-4d.html But... why not implement a pty bandwidth limitation layer? You say, I need to justify it? It's for, uh... protecting the system from unrestricted pty usage DOS attacks! Yeah. That's what it's for. Craig Milo Rogers