netdev - Re: [PATCH v2] arm: eBPF JIT compiler

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Date:   Fri, 7 Jul 2017 10:19:19 +0530
From:   Shubham Bansal <illusionist.neo@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v2] arm: eBPF JIT compiler

Okay Kees. I will take a look at it.
Best,
Shubham Bansal


On Fri, Jul 7, 2017 at 10:12 AM, Kees Cook <keescook@...omium.org> wrote:
> On Wed, Jul 5, 2017 at 8:49 PM, Shubham Bansal
> <illusionist.neo@...il.com> wrote:
>> Hi Kees,
>>
>> Problem is my ARM machine don't have clang and iproute2 which is
>> keeping me from testing the bpf tail calls.
>>
>> You should do the following to test it,.
>>
>> 1. tools/testing/selftests/bpf/
>> 2. make
>> 3. sudo ./test_progs
>>
>> And, before testing, you have to do "make headers_install".
>> These tests are for tail calls with the attached patch. If its too
>> much work, Can you please upload your arm image so that I can test it?
>> I just need a good machine.
>
> I've got all this set up now, and it faults during the test:
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000008
> ...
> CPU: 0 PID: 1922 Comm: test_progs Not tainted 4.12.0+ #60
> ...
> PC is at __htab_map_lookup_elem+0x54/0x1f4
>
> I'll see if I can send you this disk image...
>
> -Kees
>
>
> --
> Kees Cook
> Pixel Security