netdev - Re: [PATCH v2 1/3] bpf: Use 1<<16 as ceiling for immediate alignment in verifier.

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Message-ID: <a4a1fe92-fa35-1d3f-1b3c-e094d715db2c@fb.com>
Date:   Fri, 19 May 2017 14:37:56 -0700
From:   Alexei Starovoitov <ast@...com>
To:     David Miller <davem@...emloft.net>, <ecree@...arflare.com>
CC:     <daniel@...earbox.net>, <alexei.starovoitov@...il.com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] bpf: Use 1<<16 as ceiling for immediate alignment
 in verifier.

On 5/19/17 1:41 PM, David Miller wrote:
> From: Edward Cree <ecree@...arflare.com>
> Date: Fri, 19 May 2017 18:17:42 +0100
>
>> One question: is there a way to build the verifier as userland code
>>  (or at least as a module), or will I have to reboot every time I
>>  want to test a change?
>
> There currently is no such machanism, you will have to reboot every
> time.
>
> I have considered working on making the code buildable outside of the
> kernel.  It shouldn't be too hard.

it's not hard.
We did it twice and both times abandoned.
First time to have 'user space verifier' to check programs before
loading and second time for fuzzing via llvm.
Abandoned since it diverges very quickly from kernel.