Re: [ros-dev] Re: [ros-svn] [weiden] 13138: implemented the ProcessSessionInformation information class

[Joseph Galbraith]

> >   Do
> > MmCopyFrom/ToCaller use SEH?
> >
> >  If not, both are necessary.  Using SEH protects from another
> >  thread in the process (or some other component) free the VM
> >  page and cause a crash.
> >
> >  So not only must the address be checked to make sure it
> >  is a user mode address iff the caller is user mode, but
> >  the parameter need to be copied using SEH; otherwise
> >  what was just probed as valid may become invalid before
> >  the copy can be done. 
>  
>  
>  Yes... and no...
>  
>  our exception handler has a special-case for MmCopyFrom/MmCopyTo.
>  
>  The upshot is that those two functions have SEH without explicitly 
>  needing to setup an SEH frame for it. 
Fascinating... that I would have never guessed.

Thanks,

Joseph