* Andi Kleen <a...@linux.intel.com> wrote:
> > + } else {
> > + /*
> > + * The LBR logs any address in the IP, even if the IP just
> > + * faulted. This means userspace can control the from address.
> > + * Ensure we don't blindy read any address by validating it is
> > + * a known text address.
> > + */
> > + if (kernel_text_address(from))
>
> Sorry doing it this way is just incredible expensive and dumb.
If anyone using this feature notices the __module_address() overhead then
a 'module addresses RCU rbtree' could be added, which should solve the
overhead impact.
In any case Peter's patch fixes the bug without regressing the feature as
it is implemented today. Do you have a better solution that does not break
the ABI? The solution you proposed before regresses existing
functionality.
Thanks,
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
