[OT Re: Question: Variable sized matchinfo

[Patrick McHardy <kaber@trash.net>]

Laszlo Valko wrote:

>On Tue, Jan 21, 2003 at 12:42:16PM +0100, Patrick McHardy wrote:
>  
>
>>Oops, i probably missed that.
>>Anyway this doesn't seem to be real problem, you could just pass pointers
>>and copy_from_user the data. The probleme there is the match is not informed
>>if its not needed anymore, so no chance to free the memory.
>>    
>>
>
>But consider that the pointer on the kernel-side might not look like
>what it looks like on the user-side!
>
>See my patch earlier with a sparc64 compatibility fix. Basically,
>you will have to implement a thunk which translates the 32-bit userspace
>pointer sent from iptables to a 64-bit kernelspace pointer. The best
>solution is to avoid pointers, as the pointer translation usually involves
>translating the whole struct being passed because of the field
>offset differences.
>
>Laszlo
>  
>
you're right of course .. one question: i see copy_from_user in many 
places in the kernel, often within with user supplied
addresses. Do all of these don't work on sparc64 ? what a horrible 
architecture ;)

regards,
patrick