Re: [PATCH] vt: incomplete initialization of vc_tab_stop

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

On Sat, 18 Oct 2008 13:49:31 +0200
Wolfgang Kroworsch <wolfgang@kroworsch.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