1 // SPDX-License-Identifier: GPL-2.0 2 3 #define DISABLE_BRANCH_PROFILING 4 5 #include <linux/kasan.h> 6 #include <linux/memblock.h> 7 #include <linux/hugetlb.h> 8 9 #include <asm/pgalloc.h> 10 11 static int __init 12 kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block) 13 { 14 pmd_t *pmd = pmd_off_k(k_start); 15 unsigned long k_cur, k_next; 16 17 for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++, block += SZ_4M) { 18 pte_t *ptep; 19 int i; 20 21 k_next = pgd_addr_end(k_cur, k_end); 22 if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) 23 continue; 24 25 ptep = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE); 26 if (!ptep) 27 return -ENOMEM; 28 29 for (i = 0; i < PTRS_PER_PTE; i++) { 30 pte_t pte = pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block + i * PAGE_SIZE)), PAGE_KERNEL)); 31 32 __set_pte_at(&init_mm, k_cur, ptep + i, pte, 1); 33 } 34 pmd_populate_kernel(&init_mm, pmd, ptep); 35 *pmd = __pmd(pmd_val(*pmd) | _PMD_PAGE_8M); 36 } 37 return 0; 38 } 39 40 int __init kasan_init_region(void *start, size_t size) 41 { 42 unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start); 43 unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size); 44 unsigned long k_cur; 45 int ret; 46 void *block; 47 48 block = memblock_alloc(k_end - k_start, SZ_8M); 49 if (!block) 50 return -ENOMEM; 51 52 if (IS_ALIGNED(k_start, SZ_8M)) { 53 kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block); 54 k_cur = ALIGN_DOWN(k_end, SZ_8M); 55 if (k_cur == k_end) 56 goto finish; 57 } else { 58 k_cur = k_start; 59 } 60 61 ret = kasan_init_shadow_page_tables(k_start, k_end); 62 if (ret) 63 return ret; 64 65 for (; k_cur < k_end; k_cur += PAGE_SIZE) { 66 pmd_t *pmd = pmd_off_k(k_cur); 67 void *va = block + k_cur - k_start; 68 pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL); 69 70 if (k_cur < ALIGN_DOWN(k_end, SZ_512K)) 71 pte = pte_mkhuge(pte); 72 73 __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0); 74 } 75 finish: 76 flush_tlb_kernel_range(k_start, k_end); 77 return 0; 78 } 79