Re: only kernel can access copy_area ?

Still uncleanly about that...
About the copy_area's implemention.


lion wrote:
> 
> 
> Hi, all 
>      Thank you for these days' help.
>      Now, I am learning about  ipc. And have a question again. Sorry for
> troubling you!
>  
>      About the copy_area,when A sends a message to B, only kernel A and
> user B can access 
> the copy_area. But user A can not. Is these correct ? And why ?
>      In my opinion, the page table of A's copy_area is copyed from B which
> is user accessiable.
> So,user A can access the copy_area. Is that right?
> 
>      Thank you
>      ---Best regardsBo Liu
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