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[91.59.237.66]) by smtp.gmail.com with ESMTPSA id l5sm8128617wms.16.2021.11.04.04.28.04 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Nov 2021 04:28:05 -0700 (PDT) Date: Thu, 4 Nov 2021 12:27:56 +0100 From: Gary Jennejohn To: freebsd-hackers@freebsd.org Subject: Re: Complicated interactions between O_EXEC, fdescfs, fexecve, and shebangs Message-ID: <20211104122756.7f770469@ernst.home> In-Reply-To: References: Reply-To: gljennjohn@gmail.com X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; amd64-portbld-freebsd14.0) List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4HlLwk3L1Jz3hfL X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=ntZQaiA8; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of gljennjohn@gmail.com designates 2a00:1450:4864:20::42e as permitted sender) smtp.mailfrom=gljennjohn@gmail.com X-Spamd-Result: default: False [-0.16 / 15.00]; HAS_REPLYTO(0.00)[gljennjohn@gmail.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; REPLYTO_ADDR_EQ_FROM(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RECEIVED_SPAMHAUS_PBL(0.00)[91.59.237.66:received]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_REPLYTO(0.00)[gmail.com]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; NEURAL_SPAM_MEDIUM(0.86)[0.859]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_SPAM_SHORT(0.98)[0.984]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::42e:from]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N On Thu, 04 Nov 2021 08:41:29 +0100 "Drew DeVault" wrote: > On Wed Nov 3, 2021 at 2:35 PM CET, Konstantin Belousov wrote: > > - Semantic of the FreeBSD fdescfs open(2) is different, to get the > > behavior similar to Linux, you need to specify "nodup" mount option, > > see fdescfs(5). > > fdescfs(5) does not mention a nodup option, but it does mention a > linrdlnk option. Helpfully, it does not tell us what this option > actually does. > It's mentioned in the FBSD-14 fdescfs(5) man page. -- Gary Jennejohn