ksh remains in "noecho" mode forever

[vmihalko]

Detailed description of the problem:

https://bugzilla.redhat.com/show_bug.cgi?id=2185030

KSH version:

ksh 93u+m/1.0.6 (latest)

Reproducer

$ ksh
$ sudo -u root echo hello|head -1
hello
    $

What happens

After running the above command, the prompt, which is also not correctly printed (it should be at the beginning of the line), typing keys show nothing because the terminal remains in "noecho" mode forever.

[McDutchie]

I am unable to reproduce this on CentOS 7.9.2009 x86_64. (I have no access to RHEL for testing.)

Are you sure this bug exists in 93u+m/1.0.6? The Red Hat bug report you linked to refers to 93u+ 2012-08-01 (ksh-20120801-257.el8) and has no indication that 93u+m was tested.

[tvalenta]

I can't reproduce it on macOS M1 either.

[vmihalko]

Sorry for providing an incomplete reproducer. I realized that I forgot to include one specific step:

1. Add "Defaults use_pty" in /etc/sudoers
2. Execute the above command (from the first comment: ksh remains in "noecho" mode forever #672 (comment))

I can reproduce it with ksh 93u+m/1.0.6 (latest) on fedora-38.

[McDutchie]

Reproduced on Debian 11 on amd64.