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

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Message-ID: <3f2dee71-1615-4a34-d611-3ccaf407551e@virtuozzo.com>
Date:   Fri, 7 Sep 2018 19:06:42 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        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@...glegroups.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sparse@...r.kernel.org, linux-mm@...ck.org,
        linux-kbuild@...r.kernel.org
Cc:     Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Jann Horn <jannh@...gle.com>,
        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 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()?


> +	for (i = 0; i < (1 << compound_order(page)); i++)
> +		page_kasan_tag_reset(page + i);
>  	kasan_poison_shadow(page_address(page),
>  			PAGE_SIZE << compound_order(page),
>  			KASAN_KMALLOC_REDZONE);