Re: [parisc-linux] warning: minor abi change

[Carlos O'Donell <carlos@baldric.uwo.ca>]

> > This solution assumes that canonicalization is unnecessary in the kernel.
> > Probably, in most cases it is.  However, if you really need to canonicalize
> > a function pointer from user space, then you are going to have to figure
> > out how to call into the dynamic loader from the kernel.  This obviously
> > isn't very safe.  So, possibly this implies that function pointers passed
> > in syscalls should be canonicalized before the kernel is entered (i.e.,
> > glibc should do the canonicalization).
> > 
> > As far as kernel modules go, I don't know how function pointers are
> > handled.  If you pass a function pointer from one module to another,
> > does it need canonicalization?
> 
> I depend on willy/tausq/amodra/et al to understand stuff like this.

I can't really come up with a scenario where userspace passes a function
pointer to the kernel and has the kernel call or compare the function
pointer?

If someone can, please tell me :)

c.