linux-kernel - Re: [PATCH v10 08/22] kasan, arm64: untag address in __kimg_to_phys and _virt_addr_is

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Date:   Wed, 14 Nov 2018 20:52:29 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Will Deacon <will.deacon@....com>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Dave Martin <dave.martin@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        kasan-dev@...glegroups.com,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-sparse@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Vishwath Mohan <vishwath@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Jann Horn <jannh@...gle.com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Lee Smith <Lee.Smith@....com>,
        Kostya Serebryany <kcc@...gle.com>,
        Mark Brand <markbrand@...gle.com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Evgeniy Stepanov <eugenis@...gle.com>
Subject: Re: [PATCH v10 08/22] kasan, arm64: untag address in __kimg_to_phys
 and _virt_addr_is_linear

On Wed, Nov 7, 2018 at 7:10 PM, Catalin Marinas <catalin.marinas@....com> wrote:
> On Tue, Nov 06, 2018 at 06:30:23PM +0100, Andrey Konovalov wrote:
>> --- a/arch/arm64/include/asm/memory.h
>> +++ b/arch/arm64/include/asm/memory.h
>> @@ -92,6 +92,15 @@
>>  #define KASAN_THREAD_SHIFT   0
>>  #endif
>>
>> +#ifdef CONFIG_KASAN_SW_TAGS
>> +#define KASAN_TAG_SHIFTED(tag)               ((unsigned long)(tag) << 56)
>> +#define KASAN_SET_TAG(addr, tag)     (((addr) & ~KASAN_TAG_SHIFTED(0xff)) | \
>> +                                             KASAN_TAG_SHIFTED(tag))
>> +#define KASAN_RESET_TAG(addr)                KASAN_SET_TAG(addr, 0xff)
>> +#else
>> +#define KASAN_RESET_TAG(addr)                addr
>> +#endif
>
> I think we should reuse the untagged_addr() macro we have in uaccess.h
> (make it more general and move to another header file).

Will do in v11, thanks!