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

From Daniel Borkmann <daniel@iogearbox.net>
Newsgroups linux.kernel
Subject Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf
Date 2017-03-09 23:20 +0100
Message-ID <tjezD-2W7-3@gated-at.bofh.it> (permalink)
References (6 earlier) <tjaPo-rT-25@gated-at.bofh.it> <tjb8J-yF-1@gated-at.bofh.it> <tjdWV-2rg-9@gated-at.bofh.it> <tjepY-2Qt-5@gated-at.bofh.it> <tjepY-2Qt-3@gated-at.bofh.it>
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On 03/09/2017 11:07 PM, Borislav Petkov wrote:
> On Thu, Mar 09, 2017 at 10:55:47PM +0100, Borislav Petkov wrote:
>> Can you make that:
>>
>> 	setup_clear_cpu_cap(X86_FEATURE_PGE);
>>
>> and see if it fixes your issue?
>
> Hmm, in reading the thread a bit more, that might not work. If I see it
> correctly, lguest does
>
>   clear_cpu_cap(&boot_cpu_data, X86_FEATURE_PGE);
>
> after the alternatives have run and static_cpu_has() sites have already
> been patched so clearing that bit won't bring anything.

Yeah, I just tried that out and it had no effect unfortunately, the
static_cpu_has() was still 1.

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Thread

Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Fengguang Wu <fengguang.wu@intel.com> - 2017-03-02 21:30 +0100
  Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-02 22:40 +0100
    Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-08 20:30 +0100
      Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Kees Cook <keescook@chromium.org> - 2017-03-08 23:40 +0100
        Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 00:20 +0100
        Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Laura Abbott <labbott@redhat.com> - 2017-03-09 01:30 +0100
          Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Kees Cook <keescook@chromium.org> - 2017-03-09 06:40 +0100
            Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 14:10 +0100
              Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Thomas Gleixner <tglx@linutronix.de> - 2017-03-09 14:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 15:10 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Thomas Gleixner <tglx@linutronix.de> - 2017-03-09 16:00 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 19:00 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging  request at 0000a7cf David Miller <davem@davemloft.net> - 2017-03-09 19:10 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-09 19:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-09 19:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 19:40 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 22:40 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-09 23:10 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 23:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-09 23:50 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-10 00:30 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-10 00:50 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-10 01:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-12 22:50 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-09 23:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 16:00 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-09 18:50 +0100
      Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-08 23:50 +0100
        Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Fengguang Wu <fengguang.wu@intel.com> - 2017-03-09 02:40 +0100
      Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Thomas Gleixner <tglx@linutronix.de> - 2017-03-09 14:50 +0100

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