Q: copy_*_user() with size==0

[Urs Thuermann <urs@isnogud.escape.de>]

Reading the i386 source of copy_to_user() and reading some instances
of how it's used, it seems valid to pass 0 for the size argument and
that kernel address pointers, i.e. the @from argument in
copy_to_user() and the @to argument in copy_from_user() don't matter
in this case.  Is this correct for all arch's?  I don't see this
behavior documented anywhere.

urs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/