linux-kernel - Re: [PATCH] vt: incomplete initialization of vc_tab

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Date:	Wed, 22 Oct 2008 11:27:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Wolfgang Kroworsch <wolfgang@...worsch.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vt: incomplete initialization of vc_tab_stop

On Sat, 18 Oct 2008 13:49:31 +0200
Wolfgang Kroworsch <wolfgang@...worsch.de> wrote:

> Problem 1 (see patch below):
>   vc_tab_stop is declared as an array of 8 unsigned ints in struct
>   vc_data in include/linux/console_struct.h .
>   In drivers/char/vt.c only 5 of these 8 unsigned ints get initialized
>   leading to unintended tabulator placement on displays with more than
>   160 columns text.

Seems sensible enough - but need a Signed-off-by line to apply.

> 
> Problem 2 (open):
>   Upcoming displays will have more than 256 columns of text leading to
>   invalid memory access in drivers/char/vt.c during tabulator
>   calculations:
>     if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
> 	break;

Yes. We should either limit the vt size or grow the tables.

Alan
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