Syslinux - Apr 2002 - 'implicit' doesn't prevent additional parameters?

Hi,

just tried the 'implicit 0'-option with pxelinux (btw, 1.73Pre6 -
works).
What I wanted is preventing tricksters to give additional parameters
on the commandline. It prevents giving something different from the
'label'-statement ('Could not find kernel image:..'), but if I
give e.g.
linux init=/bin/sh
it gives me a root shell. It should have taken the 'append'-line
from the label statement and nothing else, or even complain about
some error loading the image - like above.

Have I missed something? 

Regards,

Josef


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Josef Siemes wrote:
> Hi,
> 
> just tried the 'implicit 0'-option with pxelinux (btw, 1.73Pre6 -
works).
> What I wanted is preventing tricksters to give additional parameters
> on the commandline. It prevents giving something different from the
> 'label'-statement ('Could not find kernel image:..'), but
if I give e.g.
> linux init=/bin/sh
> it gives me a root shell. It should have taken the 'append'-line
> from the label statement and nothing else, or even complain about
> some error loading the image - like above.
> 
> Have I missed something? 
> 
Yes -- the "implicit" statement doesn't prevent you from adding
command
line parameters, it just keeps you from specifying a kernel that isn't
listed as a label.

	-hpa

Hi,
> Yes -- the "implicit" statement doesn't prevent you from
adding command
> line parameters, it just keeps you from specifying a kernel that isn't
> listed as a label.
how much work would it be to prevent command line parameters? Say,
e.g. with 'implicit 2'? I consider this a useful feature.

Regards,

Josef
bv
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