linux-kernel - Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236 note

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Message-ID: <CAGXu5j+2Vgi77xvgOvnSKnEHPooJDPO3sWPbBWY-spfK=kWj7Q@mail.gmail.com>
Date:   Mon, 15 May 2017 15:57:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Stephen Smalley <sds@...ho.nsa.gov>,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Mateusz Guzik <mguzik@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236
 note_page+0x630/0x7e0

On Mon, May 15, 2017 at 3:15 PM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> On Tue, May 16, 2017 at 12:06:50AM +0200, Luis R. Rodriguez wrote:
>> Using QEMU emulator version 2.7.94 (v2.8.0-rc4-dirty)
>>
>> I will try updating my distro package for qemu and see if perhaps its this
>> and for the other odd fork issue I reported [0].
>>
>> [0] https://lkml.kernel.org/r/CAB=NE6VZXq3y-3pfouYTBUco2Cq2xqoLZrgDFdVx+_=_=SwG_Q@mail.gmail.com
>
> Yeah nope, using my distribution latest:
>
> QEMU emulator version 2.8.0(openSUSE Tumbleweed)
>
> And still both issues are present.
>
>   Luis

Can you enable CONFIG_X86_PTDUMP=y and then find out what is located
at ffffffffc0288000 via /sys/kernel/debug/kernel_page_tables ?

-Kees

-- 
Kees Cook
Pixel Security