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Tue, 06 Jun 2023 11:05:32 +0200 Received: from oxbe8.tb.ukmail.iss.as9143.net ([172.25.160.139]) by smtp1.tb.ukmail.iss.as9143.net with ESMTP id 6SdAqW0fShvLN6SdAquH3B; Tue, 06 Jun 2023 11:05:32 +0200 X-Env-Mailfrom: p.w.stephenson@ntlworld.com X-Env-Rcptto: zsh-workers@zsh.org X-SourceIP: 172.25.160.139 X-CNFS-Analysis: v=2.4 cv=SZoxNNdu c=1 sm=1 tr=0 ts=647ef6dc cx=a_exe a=pgSR3NrKiwmx/6vnWRL19w==:117 a=1DWFKdCB1IcA:10 a=IkcTkHD0fZMA:10 a=6E303GnDO8onAdg1nqsA:9 a=QEXdDO2ut3YA:10 a=75Kt_H3ikK-EkTT1woid:22 X-Authenticated-Sender: p.w.stephenson@ntlworld.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ntlworld.com; s=meg.feb2017; t=1686042332; bh=Lw4AgqkUKgjZtaKgbR6ghsR6rpSlD9gMLK8tnRZMRGA=; h=Date:From:To:In-Reply-To:References:Subject; b=Y5U3UMUNBTcRLBA5E0zou5YXK/V3HY4yLGupOOqseugGk3ZCjjmKy5oaPwyg6943N pqdn17esmS04Garzfe54ukiX7uSecPJEG9IAR2vBIJVz+l25PPoveyNL4lYIG1VNfq EoPM0L3XhiBCZJUoTop+z4iNCprLTU9mFoqjSbTfG3PcIcZZ6D2z7vy8ZkRiyw+6b5 TLrNgBH0LfdCYliTdfY9FM0awesSZyPlrGc1hzpQwpjirc7gzLYvwrOrJY40RgDp1V z/Ksu/NYoa2CJO4V3W2F+5wjq6uvyryblfonRVL2fYT2dzQ3C0oKadtgFMT6u/pbiw 8GdBGi0RsQe7g== Date: Tue, 6 Jun 2023 10:05:32 +0100 (BST) From: Peter Stephenson To: zsh-workers@zsh.org Message-ID: <1604572963.1688389.1686042332603@mail.virginmedia.com> In-Reply-To: References: <027f2a491b638e2ffaf7766fe4adf29537c11fdf.camel@fifi.org> <227fe72b-7441-935c-55a7-421945da54b3@hostalia.de> Subject: Re: [Bug] modules zsh/tcp, zsh/zftp unloadable, probably affecting most modern Linuxes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Priority: 3 Importance: Normal X-Mailer: Open-Xchange Mailer X-Originating-IP: 147.161.224.167 X-Originating-Client: open-xchange-appsuite X-CMAE-Envelope: MS4xfCXA0tC4BxmXv+29qyuHv+ye3HMsQwiwkHSuk4i9RiUGi2u2DyTz4k8Sb1hAUctDTIBkZPn/LdmksPpWywkhqcAkCfMD4FXztcRB/tmEimGT2eS7UzZG OsqiSZuu5ygMnC5/hMq0mdL8UpHncpCZ5tyRV0vk4h5lqIORIpASJCvhehSkRWlfwln7zwyOe2x5cq0UesKAdJU3xyED5nrbVplpth+vkxuQlUxl3EfYJYjo X-Seq: 51835 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: > On 06/06/2023 07:42 Jun T wrote: > I think the problem is '-Wl,-z,now'. man ld(1) says: > > now When generating an executable or shared library, mark it to > tell the dynamic linker to resolve all symbols when the program > is started, or when the shared library is loaded by dlopen, > instead of deferring function call resolution to the point when > the function is first called. > > It seems this option has the higher precedence than the option > '-z lazy' in the same command line, or the RTLD_LAZY for dlopen(). > > On Fedora-38: > % readelf --dynamic /usr/lib64/zsh/5.9/zsh/zftp.so | grep FLAG > 0x000000000000001e (FLAGS) BIND_NOW > 0x000000006ffffffb (FLAGS_1) Flags: NOW > > I think this flag in zftp.so is the result of '-z now' > > On Debian-11, /usr/lib/x86_64-linux-gnu/zsh/5.8/zsh/zftp.so has the > same flag. I guess Debian binary package is also built with '-z now'. > > The zftp.so built by myself does not have this flag. > > Why '-z now' is used when building binary packages? For security? I think this is just so that failure to find symbols at all will show up quickly in the build rather than at run time, which would be a real pain. One solution might be to build first with -z now to confirm that it does link, and then -z lazy to make it more useful when installed. pws