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Re: exec/read -s bug?


From: Lars Schneider
Subject: Re: exec/read -s bug?
Date: Sun, 19 Aug 2018 20:45:36 +0200

> On Aug 19, 2018, at 6:33 PM, Lars Schneider <address@hidden> wrote:
> 
> Hi,
> 
> consider this script:
> 
>       #!/bin/bash
>       [ "`whoami`" = "root" ] || {
>         exec sudo -u root "$0" "$@"
>       }
>       read -s -p "enter stuff: " stuff
> 
> If I run the script as normal user (not root!) and I abort the "read -s -p"
> call with "ctrl-c", then my shell is still in silent mode.
> 
> I can consitently replicate that behavior on Ubuntu 14.04.5 LTS (Trusty) 
> and BASH 4.3.11(1)-release (x86_64-pc-linux-gnu) as well as BASH 4.3.30.
> 
> I also installed BASH 4.4.18 from source and I can replicate the issue.

I did a mistake: The problem _was_ fixed with BASH 4.4.18.
Further testing revealed that it is fixed with 4.4. too but not in Bash-4.3 
patch 46.

I think the following item in the release notes corresponds to the problem:

 oo. Fixed a bug that caused bash to not clean up readline's state, including
     the terminal settings, if it received a fatal signal while in a readline()
     call (including `read -e' and `read -s').

Does anyone see a workaround to set the readline state properly
for older BASH versions?

Thanks,
Lars




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