linux-kernel - Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf

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Date:   Wed, 08 Mar 2017 23:51:42 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Kees Cook <keescook@...omium.org>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
        ast@...com, the arch/x86 maintainers <x86@...nel.org>,
        Laura Abbott <labbott@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request
 at 0000a7cf

On 03/08/2017 11:36 PM, Kees Cook wrote:
> On Wed, Mar 8, 2017 at 2:27 PM, Daniel Borkmann <daniel@...earbox.net> wrote:
>> [   28.474232] rodata_test: test data was not read only
>> [...]
>
> In my tests so far, I've never been able to get rodata_test to fail
> (Qemu 2.5.0, Ubuntu). I'll retry with your .config and see if I can
> recheck under Qemu 2.7.1. Do you see these failures on real hardware?

The x86_64 tests on real hardware, and the x86-32 only in the qemu
environment with the reproducer script. Haven't tested x86-32 kernel
outside of qemu so far.

Thanks,
Daniel