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Groups > linux.debian.user > #261927
| From | John Crawley <john@bunsenlabs.org> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: apt-get aborts in subshell with redirections on Debian 12 |
| Date | 2023-09-26 05:00 +0200 |
| Message-ID | <Hi6sN-bzXL-3@gated-at.bofh.it> (permalink) |
| References | (4 earlier) <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> <HhRWN-bqUN-3@gated-at.bofh.it> |
| Organization | BunsenLabs |
On 25/09/2023 20:21, Greg Wooledge wrote: > 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. Indeed! Many thanks Michael. For background, I followed up some links to get: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=657784 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1011624 https://bugs.kde.org/show_bug.cgi?id=452532#c28 https://salsa.debian.org/sudo-team/sudo/-/commit/59db341d46aa4c26b54c1270e69f2562e7f3d751 > 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. But @Greg, if you have "Defaults use_pty" why haven't you been getting the same instant aborts that I was? > I still don't get > why it matters whether the command was executed from bash or dash -- ...or ksh or zsh?? Only bash seemed to suffer from having stdin cut off. Anyway, for my personal purposes, this new behaviour looks too unpredictable and I plan to fall back on capturing stderr in a tempfile. Kludgy but maybe more robust than multiple redirections? :~$ temp=$(mktemp) :~$ sudo apt-get install nopkg 2>"$temp" Reading package lists... Done Building dependency tree... Done Reading state information... Done :~$ errors=$(<"$temp") :~$ echo "$errors" E: Unable to locate package nopkg :~$ rm "$temp" It would be nice to unpick the rest of the mystery though... (Also, if some day bash had a way of making a variable look like a file for writing.) -- John
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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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