From owner-freebsd-fs@freebsd.org Thu Feb 27 17:41:59 2020 Return-Path: Delivered-To: freebsd-fs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 7F323248A11 for ; Thu, 27 Feb 2020 17:41:59 +0000 (UTC) (envelope-from luoqi.chen@gmail.com) Received: from mail-ot1-x32e.google.com (mail-ot1-x32e.google.com [IPv6:2607:f8b0:4864:20::32e]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 48T0NQ2pNsz4R5F for ; Thu, 27 Feb 2020 17:41:58 +0000 (UTC) (envelope-from luoqi.chen@gmail.com) Received: by mail-ot1-x32e.google.com with SMTP id j20so3748366otq.3 for ; Thu, 27 Feb 2020 09:41:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=pg+5Nwmu9EKhQUYJvyfh/RBvbcvxFXOJgPlbtdwQg7M=; b=Toy/DC3rQNdHJJ56A5F4Tz6AwowShL3rQ6B2a3s1CTD9qsLoW7hbfs3RUTAHt8gXdI nKCuBADAY51L0YY9kWrPBXqulXrNdIxH0dpKcJIzNwDK6LiZz2vGLRd4lr6Y1Yk8I7WO isFBtMzaFvJAi9NB0ncmd6wMj2NDsNZfmXXOAC5f8Td/qAF+sE/hK7wazVfcJSVUWhk8 q23L5YWXgh4vS/pzSZAPZLLHRV7ky024pY87xshv5i70W+9kWE10H8HAnbspd5a+nZp/ zgi+V5c3WWNMv3qKdz5uEf6VU074nMlo+F9ZNDYJHxFu8tyVImbe3Qv0Sg9fWN3rr2PA jafA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=pg+5Nwmu9EKhQUYJvyfh/RBvbcvxFXOJgPlbtdwQg7M=; b=suZGlPnTWO6G/Y8Ri2RYzLYrFTLq+F4NA7LW/Ph0YHJATm1GoSIsHn/RTUWL24jTOc HEJHbzEZqurou/v17PnhqAodvkFs4tMGvwA6aUONk9evouHnvqibD0j+qL+ip7JPaROB /fykQ1VmWh1l6YRyX0RWa/mO8SJ0A8ZjCQmcpMcY4Yg0kjTSmhzZnEBib6FBnCkgGTDi vjJqt8YWfWXbtPvnurKljYU3Nz8NGrzh9EmvtSdk4HgbH2Uja0xAXX0jCVAI3C5ObFfJ zoWs/XHdGfEvQYuJtuCcL1B44uNFsrC3qX9XKkGb8WzFJQH6f4+6azTjRXTEUvnEl5AY y3PQ== X-Gm-Message-State: APjAAAWg8SpsvVxJ72t66kGv/InAxiC03H12LC95Lu2QZ9ITMgN1CmFN XhFonYlFTPEj3e07/cahv6Y5n6G1HN19Nby6gyYJXd3Y X-Google-Smtp-Source: APXvYqw/KBLThOc8qyZmbJz5pDRIIe2Zj2BXksxM87b6uH1w8RskNzlpRM1JdE31Gezx3VwXtLaMsw/okbmItmx2/2k= X-Received: by 2002:a05:6830:1643:: with SMTP id h3mr73408otr.70.1582825316676; Thu, 27 Feb 2020 09:41:56 -0800 (PST) MIME-Version: 1.0 From: Luoqi Chen Date: Thu, 27 Feb 2020 09:41:47 -0800 Message-ID: Subject: Linux could write to read only files on FreeBSD NFS server To: freebsd-fs@freebsd.org X-Rspamd-Queue-Id: 48T0NQ2pNsz4R5F X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=Toy/DC3r; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of luoqichen@gmail.com designates 2607:f8b0:4864:20::32e as permitted sender) smtp.mailfrom=luoqichen@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; TO_DN_NONE(0.00)[]; IP_SCORE_FREEMAIL(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; IP_SCORE(0.00)[ip: (-8.03), ipnet: 2607:f8b0::/32(-1.88), asn: 15169(-1.67), country: US(-0.05)]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[e.2.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; TAGGED_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Feb 2020 17:41:59 -0000 Hi, This was actually a pretty old problem, I noticed it a few years back and have been monitoring it when I upgrade the os on either the linux or the freebsd side -- it's still present between the latest centos and freebsd as of today. I meant to look into this issue myself, but had never found time for it, that's why I'm writing to this list, maybe it's a known problem or someone's willing to spend some time on it. And here you go, the problem, % cat ~/rotest.sh #!/bin/sh cp /dev/null x getfacl x chmod -w x getfacl x echo aaa >> x echo status $? cat x rm -f x % sh ~/rotest.sh # file: x # owner: luoqi # group: wheel user::rw- group::r-- other::r-- # file: x # owner: luoqi # group: wheel user::r-- group::r-- other::r-- status 0 aaa The script was run on a centos inside a directory nfs mounted from a freebsd. The append would fail for a centos/centos or a freebsd/freebsd combo. It's very easy to reproduce, it doesn't depend on any specific centos or freebsd version, nor on nfs version 3 or 4, nor on underlying file system ffs or zfs. -luoqi