linux-kernel - Re: [PATCH v2] arm: eBPF JIT compiler

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Message-ID: <CAGXu5j+yfOFU2xULwkQmp0Jz5pzLiurRSQ14kwGetBycdgF0Hg@mail.gmail.com>
Date:   Thu, 6 Jul 2017 21:42:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Shubham Bansal <illusionist.neo@...il.com>
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

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