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Date: Fri, 19 Dec 2014 19:31:34 +0300
From: Solar Designer <>
Subject: Re: bleeding-jumbo: john fails to show status on key press

On Thu, Dec 18, 2014 at 07:06:38AM -0900, Royce Williams wrote:
> For everything else that I know how to test, when running under sudo,
> even special/control key presses are being passed by sudo unmodified
> to the underlying executable.  What is different about how john is
> listening for a key press?

Here's when/where/how we ran into this issue before, what we found out,
and how we tried working around it:

Apparently, it's the "tcgetpgrp(fd) != getpid()" check.  Unfortunately,
its introduction predates the CVS history (it's there since 1990s,
whereas JtR was put in a CVS repo in 2002), and I don't recall the
rationale behind it.


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