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

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Date:   Tue, 11 Jul 2017 20:29:59 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: KASAN vs. boot-time switching between 4- and 5-level paging



On 07/11/2017 08:03 PM, Kirill A. Shutemov wrote:
> 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?

Sure.