linux-kernel - Re: Don't cross the (tty) streams

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Message-ID: <jer6ktt490.fsf@sykes.suse.de>
Date:	Thu, 20 Sep 2007 23:29:31 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-serial@...r.kernel.org
Subject: Re: Don't cross the (tty) streams

Matthew Wilcox <matthew@....cx> writes:

> Connect two machines with a serial cable.  On the victim:
>
> willy@...lf:~$ cat </dev/ttyS1
>
> Now, let's find out which ttyS on the other machine is connected ...
>
> willy@...th:~$ echo foo >/dev/ttyS1
> -bash: echo: write error: Input/output error
>
> Oops, that's not a serial port.  No output on rowlf, as expected.
> OK, carrying on ...
>
> willy@...th:~$ echo bar >/dev/ttyS0
>
> And yet on rowlf, we now see:
>
> foo
> bar
>
> Looks like there's an error path that doesn't throw away data on -EIO.

Read the thread starting here:
<http://lists.gnu.org/archive/html/bug-bash/2007-09/msg00020.html>.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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