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214 lines
6.1 KiB
214 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2019 Andes Technology Corporation |
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#include <linux/pfn.h> |
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#include <linux/init_task.h> |
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#include <linux/kasan.h> |
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#include <linux/kernel.h> |
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#include <linux/memblock.h> |
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#include <linux/pgtable.h> |
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#include <asm/tlbflush.h> |
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#include <asm/fixmap.h> |
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#include <asm/pgalloc.h> |
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extern pgd_t early_pg_dir[PTRS_PER_PGD]; |
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asmlinkage void __init kasan_early_init(void) |
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{ |
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uintptr_t i; |
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pgd_t *pgd = early_pg_dir + pgd_index(KASAN_SHADOW_START); |
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for (i = 0; i < PTRS_PER_PTE; ++i) |
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set_pte(kasan_early_shadow_pte + i, |
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mk_pte(virt_to_page(kasan_early_shadow_page), |
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PAGE_KERNEL)); |
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for (i = 0; i < PTRS_PER_PMD; ++i) |
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set_pmd(kasan_early_shadow_pmd + i, |
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pfn_pmd(PFN_DOWN |
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(__pa((uintptr_t) kasan_early_shadow_pte)), |
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__pgprot(_PAGE_TABLE))); |
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for (i = KASAN_SHADOW_START; i < KASAN_SHADOW_END; |
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i += PGDIR_SIZE, ++pgd) |
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set_pgd(pgd, |
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pfn_pgd(PFN_DOWN |
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(__pa(((uintptr_t) kasan_early_shadow_pmd))), |
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__pgprot(_PAGE_TABLE))); |
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/* init for swapper_pg_dir */ |
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pgd = pgd_offset_k(KASAN_SHADOW_START); |
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for (i = KASAN_SHADOW_START; i < KASAN_SHADOW_END; |
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i += PGDIR_SIZE, ++pgd) |
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set_pgd(pgd, |
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pfn_pgd(PFN_DOWN |
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(__pa(((uintptr_t) kasan_early_shadow_pmd))), |
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__pgprot(_PAGE_TABLE))); |
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local_flush_tlb_all(); |
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} |
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static void __init kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long end) |
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{ |
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phys_addr_t phys_addr; |
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pte_t *ptep, *base_pte; |
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if (pmd_none(*pmd)) |
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base_pte = memblock_alloc(PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE); |
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else |
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base_pte = (pte_t *)pmd_page_vaddr(*pmd); |
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ptep = base_pte + pte_index(vaddr); |
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do { |
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if (pte_none(*ptep)) { |
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phys_addr = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); |
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set_pte(ptep, pfn_pte(PFN_DOWN(phys_addr), PAGE_KERNEL)); |
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} |
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} while (ptep++, vaddr += PAGE_SIZE, vaddr != end); |
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set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa(base_pte)), PAGE_TABLE)); |
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} |
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static void __init kasan_populate_pmd(pgd_t *pgd, unsigned long vaddr, unsigned long end) |
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{ |
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phys_addr_t phys_addr; |
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pmd_t *pmdp, *base_pmd; |
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unsigned long next; |
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base_pmd = (pmd_t *)pgd_page_vaddr(*pgd); |
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if (base_pmd == lm_alias(kasan_early_shadow_pmd)) |
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base_pmd = memblock_alloc(PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE); |
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pmdp = base_pmd + pmd_index(vaddr); |
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do { |
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next = pmd_addr_end(vaddr, end); |
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if (pmd_none(*pmdp) && IS_ALIGNED(vaddr, PMD_SIZE) && (next - vaddr) >= PMD_SIZE) { |
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phys_addr = memblock_phys_alloc(PMD_SIZE, PMD_SIZE); |
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if (phys_addr) { |
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set_pmd(pmdp, pfn_pmd(PFN_DOWN(phys_addr), PAGE_KERNEL)); |
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continue; |
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} |
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} |
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kasan_populate_pte(pmdp, vaddr, next); |
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} while (pmdp++, vaddr = next, vaddr != end); |
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/* |
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* Wait for the whole PGD to be populated before setting the PGD in |
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* the page table, otherwise, if we did set the PGD before populating |
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* it entirely, memblock could allocate a page at a physical address |
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* where KASAN is not populated yet and then we'd get a page fault. |
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*/ |
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set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(base_pmd)), PAGE_TABLE)); |
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} |
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static void __init kasan_populate_pgd(unsigned long vaddr, unsigned long end) |
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{ |
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phys_addr_t phys_addr; |
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pgd_t *pgdp = pgd_offset_k(vaddr); |
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unsigned long next; |
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do { |
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next = pgd_addr_end(vaddr, end); |
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/* |
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* pgdp can't be none since kasan_early_init initialized all KASAN |
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* shadow region with kasan_early_shadow_pmd: if this is stillthe case, |
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* that means we can try to allocate a hugepage as a replacement. |
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*/ |
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if (pgd_page_vaddr(*pgdp) == (unsigned long)lm_alias(kasan_early_shadow_pmd) && |
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IS_ALIGNED(vaddr, PGDIR_SIZE) && (next - vaddr) >= PGDIR_SIZE) { |
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phys_addr = memblock_phys_alloc(PGDIR_SIZE, PGDIR_SIZE); |
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if (phys_addr) { |
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set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_KERNEL)); |
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continue; |
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} |
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} |
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kasan_populate_pmd(pgdp, vaddr, next); |
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} while (pgdp++, vaddr = next, vaddr != end); |
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} |
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static void __init kasan_populate(void *start, void *end) |
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{ |
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unsigned long vaddr = (unsigned long)start & PAGE_MASK; |
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unsigned long vend = PAGE_ALIGN((unsigned long)end); |
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kasan_populate_pgd(vaddr, vend); |
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local_flush_tlb_all(); |
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memset(start, KASAN_SHADOW_INIT, end - start); |
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} |
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static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end) |
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{ |
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unsigned long next; |
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void *p; |
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pgd_t *pgd_k = pgd_offset_k(vaddr); |
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do { |
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next = pgd_addr_end(vaddr, end); |
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if (pgd_page_vaddr(*pgd_k) == (unsigned long)lm_alias(kasan_early_shadow_pmd)) { |
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p = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
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set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE)); |
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} |
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} while (pgd_k++, vaddr = next, vaddr != end); |
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} |
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static void __init kasan_shallow_populate(void *start, void *end) |
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{ |
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unsigned long vaddr = (unsigned long)start & PAGE_MASK; |
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unsigned long vend = PAGE_ALIGN((unsigned long)end); |
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kasan_shallow_populate_pgd(vaddr, vend); |
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local_flush_tlb_all(); |
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} |
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void __init kasan_init(void) |
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{ |
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phys_addr_t p_start, p_end; |
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u64 i; |
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/* |
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* Populate all kernel virtual address space with kasan_early_shadow_page |
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* except for the linear mapping and the modules/kernel/BPF mapping. |
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*/ |
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kasan_populate_early_shadow((void *)KASAN_SHADOW_START, |
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(void *)kasan_mem_to_shadow((void *) |
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VMEMMAP_END)); |
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if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) |
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kasan_shallow_populate( |
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(void *)kasan_mem_to_shadow((void *)VMALLOC_START), |
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(void *)kasan_mem_to_shadow((void *)VMALLOC_END)); |
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else |
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kasan_populate_early_shadow( |
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(void *)kasan_mem_to_shadow((void *)VMALLOC_START), |
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(void *)kasan_mem_to_shadow((void *)VMALLOC_END)); |
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/* Populate the linear mapping */ |
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for_each_mem_range(i, &p_start, &p_end) { |
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void *start = (void *)__va(p_start); |
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void *end = (void *)__va(p_end); |
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if (start >= end) |
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break; |
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kasan_populate(kasan_mem_to_shadow(start), kasan_mem_to_shadow(end)); |
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} |
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/* Populate kernel, BPF, modules mapping */ |
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kasan_populate(kasan_mem_to_shadow((const void *)MODULES_VADDR), |
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kasan_mem_to_shadow((const void *)MODULES_VADDR + SZ_2G)); |
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for (i = 0; i < PTRS_PER_PTE; i++) |
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set_pte(&kasan_early_shadow_pte[i], |
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mk_pte(virt_to_page(kasan_early_shadow_page), |
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__pgprot(_PAGE_PRESENT | _PAGE_READ | |
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_PAGE_ACCESSED))); |
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memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE); |
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init_task.kasan_depth = 0; |
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}
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