From owner-freebsd-stable@freebsd.org Thu Nov 8 20:56:35 2018 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B34681105A25; Thu, 8 Nov 2018 20:56:35 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:d12:604::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 0DA416C734; Thu, 8 Nov 2018 20:56:24 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id wA8KuHHX045018 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 8 Nov 2018 21:56:18 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: eborisch@gmail.com Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id wA8KuHrW065236 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Fri, 9 Nov 2018 03:56:17 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: sudo not available after configuring ipmi serial over lan To: Eric Borisch , ian@freebsd.org References: <1541691574.52306.94.camel@freebsd.org> <1541707622.52306.134.camel@freebsd.org> Cc: freebsd-stable@freebsd.org, freebsd-questions@freebsd.org, jordancaraballo87@gmail.com From: Eugene Grosbein Message-ID: <67eb2aaa-fb93-0cf7-7f05-caf7c0e0c809@grosbein.net> Date: Fri, 9 Nov 2018 03:56:11 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM,SPF_PASS autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 SPF_PASS SPF: sender matches SPF record * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 0DA416C734 X-Spamd-Result: default: False [-3.69 / 200.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; MX_INVALID(0.50)[greylisted]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_PERMFAIL(0.00)[]; NEURAL_HAM_SHORT(-0.90)[-0.901,0]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; IP_SCORE(-1.19)[ipnet: 2a01:4f8::/29(-3.00), asn: 24940(-2.94), country: DE(-0.01)]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 20:56:35 -0000 09.11.2018 3:26, Eric Borisch wrote: > What I find interesting is that with the 'wrong' setting, you can log still > in just fine, and run most commands, but 'sudo' alone fails as described > above. (I've had the same experience on Serial-over-IPMI, but 'su' worked > fine so I never dug into it.) > > It's an easy fix, but I'm still (academically) interested in what it is > that sudo is doing that is unique. It calls syslog() function with parameters that (for default /etc/ttys and /etc/syslog.conf) makes an attempt to write to the console that blocks. You can easily verify this using "ktrace -i sudo ..." and "kdump" after.