[syslinux] Isolinux command line text affected
H. Peter Anvin
hpa at zytor.com
Fri May 15 16:30:05 PDT 2009
Sebastian Herbszt wrote:
> Михаил wrote:
>> Hi. This issue was introduced in isolinux version 3.62.
>>
>> Best regards, Mike.
>
> This issue is not limited to isolinux and should affect all derivatives.
> It only manifests if one of the message files, in your case boot.msg, contains
> a graphic. Since commit b2e6d915489d7af1177c75b961438be7cec140f0
> ("Switch the display file and graphics routines to using the getc stack)" the
> command_line buffer is reused for VGARowBuffer in graphics.inc:
>
> ; We need a buffer of 640+80 bytes. At this point, command_line should
> ; not be in use, so use that buffer.
> VGARowBuffer equ command_line
>
> The content of command_line gets overwritten and you get garbage displayed
> on the boot prompt.
>
D'oh! Thanks for root-causing this... it makes it very easy to fix.
-hpa
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