Re: apt-get aborts in subshell with redirections on Debian 12

From	Greg Wooledge <greg@wooledge.org>
Newsgroups	linux.debian.user
Subject	Re: apt-get aborts in subshell with redirections on Debian 12
Date	2023-09-25 13:30 +0200
Message-ID	<HhRWN-bqUN-3@gated-at.bofh.it> (permalink)
References	(3 earlier) <HhHup-bkoN-1@gated-at.bofh.it> <HhHNM-bkuD-3@gated-at.bofh.it> <HhJZf-blOm-3@gated-at.bofh.it> <HhKLD-bmjt-1@gated-at.bofh.it> <HhPUZ-bpJA-11@gated-at.bofh.it>
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On Mon, Sep 25, 2023 at 11:14:24AM +0200, Michael wrote:
> so i looked into /etc/sudoers and all /etc/sudoers.d/* and found two
> suspicous flags:
> 
> /etc/sudoers:
> Defaults       use_pty
> 
> /etc/sudoers.d/0pwfeedback:
> Defaults pwfeedback
> 
> then consulting the sudo manpage convinced me, it was the 'use_pty' flag (in
> section SUDOERS OPTIONS). after removing that flag everything works as
> 'expected':

Well, that is quite the find.  My systems are not freshly installed
Debian 12, but rather upgraded from previous releases.

Given the presence of an /etc/sudoers.dpkg-dist file on my system,
which does in fact contain this:

# This fixes CVE-2005-4890 and possibly breaks some versions of kdesu
# (#1011624, https://bugs.kde.org/show_bug.cgi?id=452532)
Defaults        use_pty

it looks like you've solved *most* of the mystery.  I still don't get
why it matters whether the command was executed from bash or dash --
maybe bash sets up the file descriptors differently when performing
a command substitution, in a way that has a subtle interaction surprise
with sudo's use_pty option.  I don't know.

Thread

apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-24 09:40 +0200
  Re: apt-get aborts in subshell with redirections on Debian 12 Michel Verdier <mv524@free.fr> - 2023-09-24 12:10 +0200
    Re: apt-get aborts in subshell with redirections on Debian 12 Greg Wooledge <greg@wooledge.org> - 2023-09-24 14:40 +0200
      Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-25 02:20 +0200
        Re: apt-get aborts in subshell with redirections on Debian 12 Greg Wooledge <greg@wooledge.org> - 2023-09-25 02:40 +0200
          Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-25 05:00 +0200
            Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-25 05:20 +0200
            Re: apt-get aborts in subshell with redirections on Debian 12 Greg Wooledge <greg@wooledge.org> - 2023-09-25 05:50 +0200
              Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-25 06:40 +0200
                Re: apt-get aborts in subshell with redirections on Debian 12 Greg Wooledge <greg@wooledge.org> - 2023-09-25 13:30 +0200
                Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-26 04:40 +0200
              Re: apt-get aborts in subshell with redirections on Debian 12 Michael <ml@hemathor.de> - 2023-09-25 11:20 +0200
                Re: apt-get aborts in subshell with redirections on Debian 12 Greg Wooledge <greg@wooledge.org> - 2023-09-25 13:30 +0200
                Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-26 05:00 +0200
                Re: apt-get aborts in subshell with redirections on Debian 12 Greg Wooledge <greg@wooledge.org> - 2023-09-26 05:10 +0200
                Re: apt-get aborts in subshell with redirections on Debian 12 John Crawley <john@bunsenlabs.org> - 2023-09-26 05:20 +0200
                sudo+use_pty+urxvt+pipe [WAS: apt-get aborts in subshell with  redirections on Debian 12] John Crawley <john@bunsenlabs.org> - 2023-12-24 09:50 +0100

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