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Re: [Xen-devel] [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel
- To: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Thu, 9 Jan 2020 18:27:38 -0500
- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
- Delivery-date: Thu, 09 Jan 2020 23:30:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
+
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