Re: referring a user address from ioctl entry point

[Arjan van de Ven]

On Tue, 2006-03-21 at 20:14 +0530, yogeshwar sonawane wrote:
> Hi all,
> 
> can we write directly to user virtual address from kernel space?
> i.e. dereferencing a user address from driver entry point?
> 

No this is not allowed and a big security hole at minimum.
You HAVE to use copy_from_user / copy_to_user and similar API to do
this. Be glad the FC3 kernel doesn't allow this at all ;)


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