linux-kernel - Re: [PATCH v6 16/18] khwasan, mm, arm64: tag non slab memory allocated via pagealloc

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Message-ID: <CAAeHK+wke5swBfwJUandKe=Oo643n7vHiwPGfUtarT3UmsHetg@mail.gmail.com>
Date:   Tue, 11 Sep 2018 18:10:07 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....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 <kasan-dev@...glegroups.com>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-sparse@...r.kernel.org,
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        Mark Brand <markbrand@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Vishwath Mohan <vishwath@...gle.com>
Subject: Re: [PATCH v6 16/18] khwasan, mm, arm64: tag non slab memory
 allocated via pagealloc

On Fri, Sep 7, 2018 at 6:06 PM, Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
>
>
> On 08/29/2018 02:35 PM, Andrey Konovalov wrote:
>
>>  void kasan_poison_slab(struct page *page)
>>  {
>> +     unsigned long i;
>> +
>> +     if (IS_ENABLED(CONFIG_SLAB))
>> +             page->s_mem = reset_tag(page->s_mem);
>
> Why reinitialize here, instead of single initialization in alloc_slabmgmt()?

Hm, don't see why I did it this way, looks odd to me as well. Will fix
in v7, thanks!