Bug 2139159

Summary:	Could use up and down arrow key to move cursor in tty login .
Product:	Red Hat Enterprise Linux 9	Reporter:	Fine Fan <ffan>
Component:	util-linux	Assignee:	Karel Zak <kzak>
Status:	CLOSED UPSTREAM	QA Contact:	Radka Brychtova <rskvaril>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	9.2	CC:	kdudka
Target Milestone:	rc	Keywords:	Triaged
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Hardware:	All
OS:	Linux
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Last Closed:	2023-08-09 10:01:35 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Fine Fan 2022-11-01 16:38:47 UTC

Description of problem:


Version-Release number of selected component (if applicable):
RHEL-9.2.0-20221031.0

How reproducible:


Steps to Reproduce:
1.Install the OS with RHEL-9.2.0-20221031.0
2.Switch to tty login UI.
3.Input Up and Down keys there.

Actual results:
The cursor moves up and down, and break the input behavior.

Expected results:
The  Up and Down keys should not working here.

Additional info:

Sorry I really don't know which component should I pickup, I was trying to select the "plymouth" but it seems like the GUI .

Comment 1 Kamil Dudka 2022-11-02 08:03:56 UTC

I believe the process connected to the terminal is driven by /sbin/agetty so I am switching the component to util-linux.

Comment 3 Karel Zak 2023-08-09 10:01:35 UTC

This is a well-known issue (for 20+ years). I have doubts it's possible to fix it in some elegant way that will not affect some corner cases. 

The problem is that system (usually agetty) has no clue about the current terminal setting, so it tries to minimize a way how to interpret the input. Now it supports only erase (erase one char) and kill (erase all input) keys; everything else is interpreted as username. Later after login, the session is fully configured, and it's possible to work with arrow and Fn keys.

Anyway, this has to be done upstream and tested before it will be in RHEL. It's already discussed upstream: https://github.com/util-linux/util-linux/issues/2068