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Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0

From Kees Cook <keescook@chromium.org>
Newsgroups linux.kernel
Subject Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0
Date 2017-05-16 01:00 +0200
Message-ID <tHx86-5MH-3@gated-at.bofh.it> (permalink)
References <tHwlH-5qg-7@gated-at.bofh.it> <tHwvn-5tj-5@gated-at.bofh.it>
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On Mon, May 15, 2017 at 3:15 PM, Luis R. Rodriguez <mcgrof@kernel.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

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next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-16 00:10 +0200
  Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-16 00:20 +0200
    Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Kees Cook <keescook@chromium.org> - 2017-05-16 01:00 +0200
      Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-16 01:50 +0200
        Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Kees Cook <keescook@chromium.org> - 2017-05-16 02:20 +0200
          Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-17 18:50 +0200
            Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Kees Cook <keescook@chromium.org> - 2017-05-17 20:00 +0200
              Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-19 02:50 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kenrel.org> - 2017-05-19 05:10 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-19 17:50 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-19 19:30 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 Masami Hiramatsu <mhiramat@kernel.org> - 2017-05-20 04:40 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-23 16:50 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-24 20:00 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at  arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 Catalin Marinas <catalin.marinas@arm.com> - 2017-05-19 19:40 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Andy Lutomirski <luto@kernel.org> - 2017-05-19 20:30 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Kees Cook <keescook@chromium.org> - 2017-05-19 21:20 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Andy Lutomirski <luto@kernel.org> - 2017-05-19 21:20 +0200
                Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 Kees Cook <keescook@chromium.org> - 2017-05-19 21:30 +0200
    Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236  note_page+0x630/0x7e0 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2017-05-16 01:40 +0200

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