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Re: KASAN vs. boot-time switching between 4- and 5-level paging

From "Kirill A. Shutemov" <kirill@shutemov.name>
Newsgroups linux.kernel
Subject Re: KASAN vs. boot-time switching between 4- and 5-level paging
Date 2017-07-11 19:10 +0200
Message-ID <u26PE-56j-27@gated-at.bofh.it> (permalink)
References (5 earlier) <u1Rnz-3CH-1@gated-at.bofh.it> <u20Ke-15l-3@gated-at.bofh.it> <u24Xw-3TD-25@gated-at.bofh.it> <u26PE-56j-29@gated-at.bofh.it> <u26PE-56j-31@gated-at.bofh.it>
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On Tue, Jul 11, 2017 at 07:45:48PM +0300, Andrey Ryabinin wrote:
> On 07/11/2017 06:15 PM, Andrey Ryabinin wrote:
> > 
> > I reproduced this, and this is kasan bug:
> > 
> >    │0xffffffff84864897 <x86_early_init_platform_quirks+5>   mov    $0xffffffff83f1d0b8,%rdi 
> >    │0xffffffff8486489e <x86_early_init_platform_quirks+12>  movabs $0xdffffc0000000000,%rax 
> >    │0xffffffff848648a8 <x86_early_init_platform_quirks+22>  push   %rbp
> >    │0xffffffff848648a9 <x86_early_init_platform_quirks+23>  mov    %rdi,%rdx  
> >    │0xffffffff848648ac <x86_early_init_platform_quirks+26>  shr    $0x3,%rdx
> >    │0xffffffff848648b0 <x86_early_init_platform_quirks+30>  mov    %rsp,%rbp
> >   >│0xffffffff848648b3 <x86_early_init_platform_quirks+33>  mov    (%rdx,%rax,1),%al
> > 
> > we crash on the last move which is a read from shadow
> 
> 
> Ughh, I forgot about phys_base.

Thanks! Works for me.

Can use your Signed-off-by for a [cleaned up version of your] patch?


-- 
 Kirill A. Shutemov

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Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-10 14:40 +0200
  Re: KASAN vs. boot-time switching between 4- and 5-level paging Dmitry Vyukov <dvyukov@google.com> - 2017-07-10 14:50 +0200
    Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-10 16:20 +0200
      Re: KASAN vs. boot-time switching between 4- and 5-level paging Andy Lutomirski <luto@amacapital.net> - 2017-07-10 18:00 +0200
        Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-10 20:50 +0200
          Re: KASAN vs. boot-time switching between 4- and 5-level paging Andy Lutomirski <luto@kernel.org> - 2017-07-10 22:10 +0200
            Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-10 23:30 +0200
              Re: KASAN vs. boot-time switching between 4- and 5-level paging Andy Lutomirski <luto@kernel.org> - 2017-07-11 02:40 +0200
                Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-11 12:40 +0200
                Re: KASAN vs. boot-time switching between 4- and 5-level paging Andy Lutomirski <luto@kernel.org> - 2017-07-11 17:10 +0200
                Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-11 19:10 +0200
                Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-07-11 21:10 +0200
                Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-13 16:00 +0200
                Re: KASAN vs. boot-time switching between 4- and 5-level paging "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-13 16:20 +0200

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