On Tue, Jul 11, 2017 at 07:45:48PM +0300, Andrey Ryabinin wrote:

On 07/11/2017 06:15 PM, Andrey Ryabinin wrote:

quoted

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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