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73 lines
1.8 KiB
73 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#define DISABLE_BRANCH_PROFILING |
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#include <linux/kasan.h> |
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#include <linux/memblock.h> |
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#include <linux/hugetlb.h> |
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static int __init |
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kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block) |
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{ |
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pmd_t *pmd = pmd_off_k(k_start); |
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unsigned long k_cur, k_next; |
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for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) { |
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pte_basic_t *new; |
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k_next = pgd_addr_end(k_cur, k_end); |
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k_next = pgd_addr_end(k_next, k_end); |
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if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) |
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continue; |
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new = memblock_alloc(sizeof(pte_basic_t), SZ_4K); |
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if (!new) |
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return -ENOMEM; |
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*new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL))); |
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hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M); |
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hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M); |
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} |
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return 0; |
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} |
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int __init kasan_init_region(void *start, size_t size) |
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{ |
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unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start); |
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unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size); |
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unsigned long k_cur; |
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int ret; |
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void *block; |
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block = memblock_alloc(k_end - k_start, SZ_8M); |
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if (!block) |
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return -ENOMEM; |
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if (IS_ALIGNED(k_start, SZ_8M)) { |
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kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block); |
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k_cur = ALIGN_DOWN(k_end, SZ_8M); |
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if (k_cur == k_end) |
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goto finish; |
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} else { |
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k_cur = k_start; |
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} |
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ret = kasan_init_shadow_page_tables(k_start, k_end); |
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if (ret) |
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return ret; |
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for (; k_cur < k_end; k_cur += PAGE_SIZE) { |
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pmd_t *pmd = pmd_off_k(k_cur); |
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void *va = block + k_cur - k_start; |
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pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL); |
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if (k_cur < ALIGN_DOWN(k_end, SZ_512K)) |
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pte = pte_mkhuge(pte); |
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__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0); |
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} |
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finish: |
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flush_tlb_kernel_range(k_start, k_end); |
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return 0; |
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}
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