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Date:	Wed, 23 Jul 2014 22:01:18 -0700
From:	Alexei Starovoitov <>
To:	Kees Cook <>
Cc:	"David S. Miller" <>,
	Ingo Molnar <>,
	Linus Torvalds <>,
	Andy Lutomirski <>,
	Steven Rostedt <>,
	Daniel Borkmann <>,
	Chema Gonzalez <>,
	Eric Dumazet <>,
	Peter Zijlstra <>,
	Arnaldo Carvalho de Melo <>,
	Jiri Olsa <>,
	Thomas Gleixner <>,
	"H. Peter Anvin" <>,
	Andrew Morton <>,
	Linux API <>,
	Network Development <>,
	LKML <>
Subject: Re: [PATCH RFC v2 net-next 10/16] bpf: add eBPF verifier

On Wed, Jul 23, 2014 at 5:48 PM, Alexei Starovoitov <> wrote:
> check_reg_arg() is indeed incorrect here. Will fix. That was a good catch.
> Thank you for review!

I fixed this missing check_reg_arg() check, addressed feedback for
other patches, rebased it and pushed it:

Also replaced dump into syslog from verifier with print into user supplied
buffer, so that user space can see why verifier rejected the program.
The more I play with it the more I like fd-based user interface. Cannot
thank enough Andy for suggesting it :)
Currently map_id is still there as kernel internal id that programs are
using to access maps. I'll try to replace it with direct pointer.
That will save one idr_find() lookup in critical path. That's a good
reason to add new 16-byte eBPF instruction. It will be
"load 64-bit immediate" that we've discussed before.
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