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