bug#40550: zsh: sudo is not setuid

[Efraim Flashner <efraim@flashner.co.il>]

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On Sat, Apr 11, 2020 at 01:10:17PM +0300, Alexandru-Sergiu Marton wrote:
> Hi,
> 
> I changed my default shell to zsh with the following line added to
> my user-account record in my config.scm:
> 
> (shell #~(string-append #$zsh "/bin/zsh"))
> 
> After reconfiguring the system and rebooting, when I try to run sudo or
> su (I guess this problem appears for every thing in %setuid-programs), I
> get a message saying it isn't actually a setuid program.
> 
> I'm writing this from a reconfigured system started at the same point as
> the zsh one started, but with bash. Here I don't have that problem --
> setuid programs work as expected.
> 
> Steps to reproduce:
> - $ guix pull
> - Change the default shell to zsh in your config.scm, as presented
>   above.
> - $ sudo guix system reconfigure config.scm
> - Reboot.
> - Try to run sudo or su. It should give you an error.

Do you have sudo installed in a profile? /run/setuid-programs/sudo
should be the first 'sudo' in your PATH regardless of the shell. What's
the contents of your $PATH?

(ins)efraim@E5400 ~$ which -a sudo
/run/setuid-programs/sudo
/run/current-system/profile/bin/sudo
(ins)efraim@E5400 ~$ guix environment --ad-hoc zsh
substitute: updating substitutes from 'http://192.168.1.183:3000'... 100.0%
substitute: updating substitutes from 'http://192.168.1.217:3000'... 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bayfront.guix.gnu.org'... 100.0%
The following derivation will be built:
   /gnu/store/yfqfk66vl1s6av45a92ml5l60d2kaxyk-profile.drv
2.1 MB will be downloaded:
   /gnu/store/icyx0ynnaaradzzxfqyjrwy0x545zdn5-zsh-5.8
The following profile hooks will be built:
   /gnu/store/8kim2ay78nrlgpdks734hridk21waxhc-fonts-dir.drv
   /gnu/store/fxdkr919viih72p9s2zkiadgj7r182d1-info-dir.drv
   /gnu/store/ml3s254v7zf4dmwmfpc59clr0xgllsbn-ca-certificate-bundle.drv
   /gnu/store/rvd1xybadpnzwlm1qz7iqcsky1dj2myw-manual-database.drv
downloading from https://ci.guix.gnu.org/nar/lzip/icyx0ynnaaradzzxfqyjrwy0x545zdn5-zsh-5.8...
 zsh-5.8  2.0MiB                                            1.6MiB/s 00:01 [##################] 100.0%

building CA certificate bundle...
building fonts directory...
building directory of Info manuals...
building database for manual pages...
building profile with 1 package...
(ins)efraim@E5400 ~ [env]$ zsh
E5400% which -a sudo
/run/setuid-programs/sudo
/run/current-system/profile/bin/sudo


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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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