On Wed, Jun 11, 2014 at 3:27 PM, H. Peter Anvin [off-list ref] wrote:

On 06/11/2014 03:22 PM, Andy Lutomirski wrote:

quoted

On Wed, Jun 11, 2014 at 3:18 PM, H. Peter Anvin [off-list ref] wrote:

quoted

On 06/11/2014 02:56 PM, Andy Lutomirski wrote:

quoted

13ns is with the simplest nonempty filter.  I hope that empty filters
don't work.

Why wouldn't they?

Is it permissible to fall off the end of a BPF program?  I'm getting
EINVAL trying to install an actual empty filter.  The filter I tested
with was:

What I meant was that there has to be a well-defined behavior for the
program falling off the end anyway, and that that should be preserved.

I guess it is possible to require that all code paths must provably
reach a termination point.

Dunno.  I haven't ever touched any of the actual BPF code.  This whole
patchset only changes the code that invokes the BPF evaluator.

--Andy