linux-kernel - Re: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel

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Date:   Thu, 9 Jan 2020 18:27:38 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Sergey Dyasli <sergey.dyasli@...rix.com>, xen-devel@...ts.xen.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        George Dunlap <george.dunlap@...rix.com>,
        Ross Lagerwall <ross.lagerwall@...rix.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel



On 1/8/20 10:20 AM, Sergey Dyasli wrote:
> @@ -1943,6 +1973,15 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
>   	if (i && i < pgd_index(__START_KERNEL_map))
>   		init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
>   
> +#ifdef CONFIG_KASAN
> +	/*
> +	 * Copy KASAN mappings
> +	 * ffffec0000000000 - fffffbffffffffff (=44 bits) kasan shadow memory (16TB)
> +	 */
> +	for (i = 0xec0 >> 3; i < 0xfc0 >> 3; i++)

Are you referring here to  KASAN_SHADOW_START and KASAN_SHADOW_END? If 
so, can you use them instead?

-boris

> +		init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
> +#endif
> +
>