1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2be3606ffSAndrey Ryabinin #define DISABLE_BRANCH_PROFILING 385155229SAndrey Ryabinin #define pr_fmt(fmt) "kasan: " fmt 4ef7f0d6aSAndrey Ryabinin #include <linux/bootmem.h> 5ef7f0d6aSAndrey Ryabinin #include <linux/kasan.h> 6ef7f0d6aSAndrey Ryabinin #include <linux/kdebug.h> 72aeb0736SAndrey Ryabinin #include <linux/memblock.h> 8ef7f0d6aSAndrey Ryabinin #include <linux/mm.h> 9ef7f0d6aSAndrey Ryabinin #include <linux/sched.h> 109164bb4aSIngo Molnar #include <linux/sched/task.h> 11ef7f0d6aSAndrey Ryabinin #include <linux/vmalloc.h> 12ef7f0d6aSAndrey Ryabinin 135520b7e7SIngo Molnar #include <asm/e820/types.h> 142aeb0736SAndrey Ryabinin #include <asm/pgalloc.h> 15ef7f0d6aSAndrey Ryabinin #include <asm/tlbflush.h> 16ef7f0d6aSAndrey Ryabinin #include <asm/sections.h> 17b9d05200STom Lendacky #include <asm/pgtable.h> 1892a0f81dSThomas Gleixner #include <asm/cpu_entry_area.h> 19ef7f0d6aSAndrey Ryabinin 2008b46d5dSIngo Molnar extern struct range pfn_mapped[E820_MAX_ENTRIES]; 21ef7f0d6aSAndrey Ryabinin 2212a8cc7fSAndrey Ryabinin static p4d_t tmp_p4d_table[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 2312a8cc7fSAndrey Ryabinin 242aeb0736SAndrey Ryabinin static __init void *early_alloc(size_t size, int nid) 252aeb0736SAndrey Ryabinin { 262aeb0736SAndrey Ryabinin return memblock_virt_alloc_try_nid_nopanic(size, size, 272aeb0736SAndrey Ryabinin __pa(MAX_DMA_ADDRESS), BOOTMEM_ALLOC_ACCESSIBLE, nid); 282aeb0736SAndrey Ryabinin } 292aeb0736SAndrey Ryabinin 302aeb0736SAndrey Ryabinin static void __init kasan_populate_pmd(pmd_t *pmd, unsigned long addr, 312aeb0736SAndrey Ryabinin unsigned long end, int nid) 322aeb0736SAndrey Ryabinin { 332aeb0736SAndrey Ryabinin pte_t *pte; 342aeb0736SAndrey Ryabinin 352aeb0736SAndrey Ryabinin if (pmd_none(*pmd)) { 362aeb0736SAndrey Ryabinin void *p; 372aeb0736SAndrey Ryabinin 382aeb0736SAndrey Ryabinin if (boot_cpu_has(X86_FEATURE_PSE) && 392aeb0736SAndrey Ryabinin ((end - addr) == PMD_SIZE) && 402aeb0736SAndrey Ryabinin IS_ALIGNED(addr, PMD_SIZE)) { 412aeb0736SAndrey Ryabinin p = early_alloc(PMD_SIZE, nid); 422aeb0736SAndrey Ryabinin if (p && pmd_set_huge(pmd, __pa(p), PAGE_KERNEL)) 432aeb0736SAndrey Ryabinin return; 442aeb0736SAndrey Ryabinin else if (p) 452aeb0736SAndrey Ryabinin memblock_free(__pa(p), PMD_SIZE); 462aeb0736SAndrey Ryabinin } 472aeb0736SAndrey Ryabinin 482aeb0736SAndrey Ryabinin p = early_alloc(PAGE_SIZE, nid); 492aeb0736SAndrey Ryabinin pmd_populate_kernel(&init_mm, pmd, p); 502aeb0736SAndrey Ryabinin } 512aeb0736SAndrey Ryabinin 522aeb0736SAndrey Ryabinin pte = pte_offset_kernel(pmd, addr); 532aeb0736SAndrey Ryabinin do { 542aeb0736SAndrey Ryabinin pte_t entry; 552aeb0736SAndrey Ryabinin void *p; 562aeb0736SAndrey Ryabinin 572aeb0736SAndrey Ryabinin if (!pte_none(*pte)) 582aeb0736SAndrey Ryabinin continue; 592aeb0736SAndrey Ryabinin 602aeb0736SAndrey Ryabinin p = early_alloc(PAGE_SIZE, nid); 612aeb0736SAndrey Ryabinin entry = pfn_pte(PFN_DOWN(__pa(p)), PAGE_KERNEL); 622aeb0736SAndrey Ryabinin set_pte_at(&init_mm, addr, pte, entry); 632aeb0736SAndrey Ryabinin } while (pte++, addr += PAGE_SIZE, addr != end); 642aeb0736SAndrey Ryabinin } 652aeb0736SAndrey Ryabinin 662aeb0736SAndrey Ryabinin static void __init kasan_populate_pud(pud_t *pud, unsigned long addr, 672aeb0736SAndrey Ryabinin unsigned long end, int nid) 682aeb0736SAndrey Ryabinin { 692aeb0736SAndrey Ryabinin pmd_t *pmd; 702aeb0736SAndrey Ryabinin unsigned long next; 712aeb0736SAndrey Ryabinin 722aeb0736SAndrey Ryabinin if (pud_none(*pud)) { 732aeb0736SAndrey Ryabinin void *p; 742aeb0736SAndrey Ryabinin 752aeb0736SAndrey Ryabinin if (boot_cpu_has(X86_FEATURE_GBPAGES) && 762aeb0736SAndrey Ryabinin ((end - addr) == PUD_SIZE) && 772aeb0736SAndrey Ryabinin IS_ALIGNED(addr, PUD_SIZE)) { 782aeb0736SAndrey Ryabinin p = early_alloc(PUD_SIZE, nid); 792aeb0736SAndrey Ryabinin if (p && pud_set_huge(pud, __pa(p), PAGE_KERNEL)) 802aeb0736SAndrey Ryabinin return; 812aeb0736SAndrey Ryabinin else if (p) 822aeb0736SAndrey Ryabinin memblock_free(__pa(p), PUD_SIZE); 832aeb0736SAndrey Ryabinin } 842aeb0736SAndrey Ryabinin 852aeb0736SAndrey Ryabinin p = early_alloc(PAGE_SIZE, nid); 862aeb0736SAndrey Ryabinin pud_populate(&init_mm, pud, p); 872aeb0736SAndrey Ryabinin } 882aeb0736SAndrey Ryabinin 892aeb0736SAndrey Ryabinin pmd = pmd_offset(pud, addr); 902aeb0736SAndrey Ryabinin do { 912aeb0736SAndrey Ryabinin next = pmd_addr_end(addr, end); 922aeb0736SAndrey Ryabinin if (!pmd_large(*pmd)) 932aeb0736SAndrey Ryabinin kasan_populate_pmd(pmd, addr, next, nid); 942aeb0736SAndrey Ryabinin } while (pmd++, addr = next, addr != end); 952aeb0736SAndrey Ryabinin } 962aeb0736SAndrey Ryabinin 972aeb0736SAndrey Ryabinin static void __init kasan_populate_p4d(p4d_t *p4d, unsigned long addr, 982aeb0736SAndrey Ryabinin unsigned long end, int nid) 992aeb0736SAndrey Ryabinin { 1002aeb0736SAndrey Ryabinin pud_t *pud; 1012aeb0736SAndrey Ryabinin unsigned long next; 1022aeb0736SAndrey Ryabinin 1032aeb0736SAndrey Ryabinin if (p4d_none(*p4d)) { 1042aeb0736SAndrey Ryabinin void *p = early_alloc(PAGE_SIZE, nid); 1052aeb0736SAndrey Ryabinin 1062aeb0736SAndrey Ryabinin p4d_populate(&init_mm, p4d, p); 1072aeb0736SAndrey Ryabinin } 1082aeb0736SAndrey Ryabinin 1092aeb0736SAndrey Ryabinin pud = pud_offset(p4d, addr); 1102aeb0736SAndrey Ryabinin do { 1112aeb0736SAndrey Ryabinin next = pud_addr_end(addr, end); 1122aeb0736SAndrey Ryabinin if (!pud_large(*pud)) 1132aeb0736SAndrey Ryabinin kasan_populate_pud(pud, addr, next, nid); 1142aeb0736SAndrey Ryabinin } while (pud++, addr = next, addr != end); 1152aeb0736SAndrey Ryabinin } 1162aeb0736SAndrey Ryabinin 1172aeb0736SAndrey Ryabinin static void __init kasan_populate_pgd(pgd_t *pgd, unsigned long addr, 1182aeb0736SAndrey Ryabinin unsigned long end, int nid) 1192aeb0736SAndrey Ryabinin { 1202aeb0736SAndrey Ryabinin void *p; 1212aeb0736SAndrey Ryabinin p4d_t *p4d; 1222aeb0736SAndrey Ryabinin unsigned long next; 1232aeb0736SAndrey Ryabinin 1242aeb0736SAndrey Ryabinin if (pgd_none(*pgd)) { 1252aeb0736SAndrey Ryabinin p = early_alloc(PAGE_SIZE, nid); 1262aeb0736SAndrey Ryabinin pgd_populate(&init_mm, pgd, p); 1272aeb0736SAndrey Ryabinin } 1282aeb0736SAndrey Ryabinin 1292aeb0736SAndrey Ryabinin p4d = p4d_offset(pgd, addr); 1302aeb0736SAndrey Ryabinin do { 1312aeb0736SAndrey Ryabinin next = p4d_addr_end(addr, end); 1322aeb0736SAndrey Ryabinin kasan_populate_p4d(p4d, addr, next, nid); 1332aeb0736SAndrey Ryabinin } while (p4d++, addr = next, addr != end); 1342aeb0736SAndrey Ryabinin } 1352aeb0736SAndrey Ryabinin 1362aeb0736SAndrey Ryabinin static void __init kasan_populate_shadow(unsigned long addr, unsigned long end, 1372aeb0736SAndrey Ryabinin int nid) 1382aeb0736SAndrey Ryabinin { 1392aeb0736SAndrey Ryabinin pgd_t *pgd; 1402aeb0736SAndrey Ryabinin unsigned long next; 1412aeb0736SAndrey Ryabinin 1422aeb0736SAndrey Ryabinin addr = addr & PAGE_MASK; 1432aeb0736SAndrey Ryabinin end = round_up(end, PAGE_SIZE); 1442aeb0736SAndrey Ryabinin pgd = pgd_offset_k(addr); 1452aeb0736SAndrey Ryabinin do { 1462aeb0736SAndrey Ryabinin next = pgd_addr_end(addr, end); 1472aeb0736SAndrey Ryabinin kasan_populate_pgd(pgd, addr, next, nid); 1482aeb0736SAndrey Ryabinin } while (pgd++, addr = next, addr != end); 1492aeb0736SAndrey Ryabinin } 1502aeb0736SAndrey Ryabinin 1512aeb0736SAndrey Ryabinin static void __init map_range(struct range *range) 152ef7f0d6aSAndrey Ryabinin { 153ef7f0d6aSAndrey Ryabinin unsigned long start; 154ef7f0d6aSAndrey Ryabinin unsigned long end; 155ef7f0d6aSAndrey Ryabinin 156ef7f0d6aSAndrey Ryabinin start = (unsigned long)kasan_mem_to_shadow(pfn_to_kaddr(range->start)); 157ef7f0d6aSAndrey Ryabinin end = (unsigned long)kasan_mem_to_shadow(pfn_to_kaddr(range->end)); 158ef7f0d6aSAndrey Ryabinin 1592aeb0736SAndrey Ryabinin kasan_populate_shadow(start, end, early_pfn_to_nid(range->start)); 160ef7f0d6aSAndrey Ryabinin } 161ef7f0d6aSAndrey Ryabinin 162ef7f0d6aSAndrey Ryabinin static void __init clear_pgds(unsigned long start, 163ef7f0d6aSAndrey Ryabinin unsigned long end) 164ef7f0d6aSAndrey Ryabinin { 165d691a3cfSKirill A. Shutemov pgd_t *pgd; 16612a8cc7fSAndrey Ryabinin /* See comment in kasan_init() */ 16712a8cc7fSAndrey Ryabinin unsigned long pgd_end = end & PGDIR_MASK; 168d691a3cfSKirill A. Shutemov 16912a8cc7fSAndrey Ryabinin for (; start < pgd_end; start += PGDIR_SIZE) { 170d691a3cfSKirill A. Shutemov pgd = pgd_offset_k(start); 171d691a3cfSKirill A. Shutemov /* 172d691a3cfSKirill A. Shutemov * With folded p4d, pgd_clear() is nop, use p4d_clear() 173d691a3cfSKirill A. Shutemov * instead. 174d691a3cfSKirill A. Shutemov */ 175d691a3cfSKirill A. Shutemov if (CONFIG_PGTABLE_LEVELS < 5) 176d691a3cfSKirill A. Shutemov p4d_clear(p4d_offset(pgd, start)); 177d691a3cfSKirill A. Shutemov else 178d691a3cfSKirill A. Shutemov pgd_clear(pgd); 179d691a3cfSKirill A. Shutemov } 18012a8cc7fSAndrey Ryabinin 18112a8cc7fSAndrey Ryabinin pgd = pgd_offset_k(start); 18212a8cc7fSAndrey Ryabinin for (; start < end; start += P4D_SIZE) 18312a8cc7fSAndrey Ryabinin p4d_clear(p4d_offset(pgd, start)); 18412a8cc7fSAndrey Ryabinin } 18512a8cc7fSAndrey Ryabinin 18612a8cc7fSAndrey Ryabinin static inline p4d_t *early_p4d_offset(pgd_t *pgd, unsigned long addr) 18712a8cc7fSAndrey Ryabinin { 18812a8cc7fSAndrey Ryabinin unsigned long p4d; 18912a8cc7fSAndrey Ryabinin 19012a8cc7fSAndrey Ryabinin if (!IS_ENABLED(CONFIG_X86_5LEVEL)) 19112a8cc7fSAndrey Ryabinin return (p4d_t *)pgd; 19212a8cc7fSAndrey Ryabinin 19312a8cc7fSAndrey Ryabinin p4d = __pa_nodebug(pgd_val(*pgd)) & PTE_PFN_MASK; 19412a8cc7fSAndrey Ryabinin p4d += __START_KERNEL_map - phys_base; 19512a8cc7fSAndrey Ryabinin return (p4d_t *)p4d + p4d_index(addr); 19612a8cc7fSAndrey Ryabinin } 19712a8cc7fSAndrey Ryabinin 19812a8cc7fSAndrey Ryabinin static void __init kasan_early_p4d_populate(pgd_t *pgd, 19912a8cc7fSAndrey Ryabinin unsigned long addr, 20012a8cc7fSAndrey Ryabinin unsigned long end) 20112a8cc7fSAndrey Ryabinin { 20212a8cc7fSAndrey Ryabinin pgd_t pgd_entry; 20312a8cc7fSAndrey Ryabinin p4d_t *p4d, p4d_entry; 20412a8cc7fSAndrey Ryabinin unsigned long next; 20512a8cc7fSAndrey Ryabinin 20612a8cc7fSAndrey Ryabinin if (pgd_none(*pgd)) { 20712a8cc7fSAndrey Ryabinin pgd_entry = __pgd(_KERNPG_TABLE | __pa_nodebug(kasan_zero_p4d)); 20812a8cc7fSAndrey Ryabinin set_pgd(pgd, pgd_entry); 20912a8cc7fSAndrey Ryabinin } 21012a8cc7fSAndrey Ryabinin 21112a8cc7fSAndrey Ryabinin p4d = early_p4d_offset(pgd, addr); 21212a8cc7fSAndrey Ryabinin do { 21312a8cc7fSAndrey Ryabinin next = p4d_addr_end(addr, end); 21412a8cc7fSAndrey Ryabinin 21512a8cc7fSAndrey Ryabinin if (!p4d_none(*p4d)) 21612a8cc7fSAndrey Ryabinin continue; 21712a8cc7fSAndrey Ryabinin 21812a8cc7fSAndrey Ryabinin p4d_entry = __p4d(_KERNPG_TABLE | __pa_nodebug(kasan_zero_pud)); 21912a8cc7fSAndrey Ryabinin set_p4d(p4d, p4d_entry); 22012a8cc7fSAndrey Ryabinin } while (p4d++, addr = next, addr != end && p4d_none(*p4d)); 221ef7f0d6aSAndrey Ryabinin } 222ef7f0d6aSAndrey Ryabinin 2235d5aa3cfSAlexander Popov static void __init kasan_map_early_shadow(pgd_t *pgd) 224ef7f0d6aSAndrey Ryabinin { 22512a8cc7fSAndrey Ryabinin /* See comment in kasan_init() */ 22612a8cc7fSAndrey Ryabinin unsigned long addr = KASAN_SHADOW_START & PGDIR_MASK; 227ef7f0d6aSAndrey Ryabinin unsigned long end = KASAN_SHADOW_END; 22812a8cc7fSAndrey Ryabinin unsigned long next; 229ef7f0d6aSAndrey Ryabinin 23012a8cc7fSAndrey Ryabinin pgd += pgd_index(addr); 23112a8cc7fSAndrey Ryabinin do { 23212a8cc7fSAndrey Ryabinin next = pgd_addr_end(addr, end); 23312a8cc7fSAndrey Ryabinin kasan_early_p4d_populate(pgd, addr, next); 23412a8cc7fSAndrey Ryabinin } while (pgd++, addr = next, addr != end); 235ef7f0d6aSAndrey Ryabinin } 236ef7f0d6aSAndrey Ryabinin 237ef7f0d6aSAndrey Ryabinin #ifdef CONFIG_KASAN_INLINE 238ef7f0d6aSAndrey Ryabinin static int kasan_die_handler(struct notifier_block *self, 239ef7f0d6aSAndrey Ryabinin unsigned long val, 240ef7f0d6aSAndrey Ryabinin void *data) 241ef7f0d6aSAndrey Ryabinin { 242ef7f0d6aSAndrey Ryabinin if (val == DIE_GPF) { 2432ba78056SDmitry Vyukov pr_emerg("CONFIG_KASAN_INLINE enabled\n"); 2442ba78056SDmitry Vyukov pr_emerg("GPF could be caused by NULL-ptr deref or user memory access\n"); 245ef7f0d6aSAndrey Ryabinin } 246ef7f0d6aSAndrey Ryabinin return NOTIFY_OK; 247ef7f0d6aSAndrey Ryabinin } 248ef7f0d6aSAndrey Ryabinin 249ef7f0d6aSAndrey Ryabinin static struct notifier_block kasan_die_notifier = { 250ef7f0d6aSAndrey Ryabinin .notifier_call = kasan_die_handler, 251ef7f0d6aSAndrey Ryabinin }; 252ef7f0d6aSAndrey Ryabinin #endif 253ef7f0d6aSAndrey Ryabinin 2545d5aa3cfSAlexander Popov void __init kasan_early_init(void) 2555d5aa3cfSAlexander Popov { 2565d5aa3cfSAlexander Popov int i; 25721729f81STom Lendacky pteval_t pte_val = __pa_nodebug(kasan_zero_page) | __PAGE_KERNEL | _PAGE_ENC; 2585d5aa3cfSAlexander Popov pmdval_t pmd_val = __pa_nodebug(kasan_zero_pte) | _KERNPG_TABLE; 2595d5aa3cfSAlexander Popov pudval_t pud_val = __pa_nodebug(kasan_zero_pmd) | _KERNPG_TABLE; 2605480bb61SKirill A. Shutemov p4dval_t p4d_val = __pa_nodebug(kasan_zero_pud) | _KERNPG_TABLE; 2615d5aa3cfSAlexander Popov 2625d5aa3cfSAlexander Popov for (i = 0; i < PTRS_PER_PTE; i++) 2635d5aa3cfSAlexander Popov kasan_zero_pte[i] = __pte(pte_val); 2645d5aa3cfSAlexander Popov 2655d5aa3cfSAlexander Popov for (i = 0; i < PTRS_PER_PMD; i++) 2665d5aa3cfSAlexander Popov kasan_zero_pmd[i] = __pmd(pmd_val); 2675d5aa3cfSAlexander Popov 2685d5aa3cfSAlexander Popov for (i = 0; i < PTRS_PER_PUD; i++) 2695d5aa3cfSAlexander Popov kasan_zero_pud[i] = __pud(pud_val); 2705d5aa3cfSAlexander Popov 27112a8cc7fSAndrey Ryabinin for (i = 0; IS_ENABLED(CONFIG_X86_5LEVEL) && i < PTRS_PER_P4D; i++) 2725480bb61SKirill A. Shutemov kasan_zero_p4d[i] = __p4d(p4d_val); 2735480bb61SKirill A. Shutemov 27465ade2f8SKirill A. Shutemov kasan_map_early_shadow(early_top_pgt); 27565ade2f8SKirill A. Shutemov kasan_map_early_shadow(init_top_pgt); 2765d5aa3cfSAlexander Popov } 2775d5aa3cfSAlexander Popov 278ef7f0d6aSAndrey Ryabinin void __init kasan_init(void) 279ef7f0d6aSAndrey Ryabinin { 280ef7f0d6aSAndrey Ryabinin int i; 28121506525SAndy Lutomirski void *shadow_cpu_entry_begin, *shadow_cpu_entry_end; 282ef7f0d6aSAndrey Ryabinin 283ef7f0d6aSAndrey Ryabinin #ifdef CONFIG_KASAN_INLINE 284ef7f0d6aSAndrey Ryabinin register_die_notifier(&kasan_die_notifier); 285ef7f0d6aSAndrey Ryabinin #endif 286ef7f0d6aSAndrey Ryabinin 28765ade2f8SKirill A. Shutemov memcpy(early_top_pgt, init_top_pgt, sizeof(early_top_pgt)); 28812a8cc7fSAndrey Ryabinin 28912a8cc7fSAndrey Ryabinin /* 29012a8cc7fSAndrey Ryabinin * We use the same shadow offset for 4- and 5-level paging to 29112a8cc7fSAndrey Ryabinin * facilitate boot-time switching between paging modes. 29212a8cc7fSAndrey Ryabinin * As result in 5-level paging mode KASAN_SHADOW_START and 29312a8cc7fSAndrey Ryabinin * KASAN_SHADOW_END are not aligned to PGD boundary. 29412a8cc7fSAndrey Ryabinin * 29512a8cc7fSAndrey Ryabinin * KASAN_SHADOW_START doesn't share PGD with anything else. 29612a8cc7fSAndrey Ryabinin * We claim whole PGD entry to make things easier. 29712a8cc7fSAndrey Ryabinin * 29812a8cc7fSAndrey Ryabinin * KASAN_SHADOW_END lands in the last PGD entry and it collides with 29912a8cc7fSAndrey Ryabinin * bunch of things like kernel code, modules, EFI mapping, etc. 30012a8cc7fSAndrey Ryabinin * We need to take extra steps to not overwrite them. 30112a8cc7fSAndrey Ryabinin */ 30212a8cc7fSAndrey Ryabinin if (IS_ENABLED(CONFIG_X86_5LEVEL)) { 30312a8cc7fSAndrey Ryabinin void *ptr; 30412a8cc7fSAndrey Ryabinin 30512a8cc7fSAndrey Ryabinin ptr = (void *)pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_END)); 30612a8cc7fSAndrey Ryabinin memcpy(tmp_p4d_table, (void *)ptr, sizeof(tmp_p4d_table)); 30712a8cc7fSAndrey Ryabinin set_pgd(&early_top_pgt[pgd_index(KASAN_SHADOW_END)], 30812a8cc7fSAndrey Ryabinin __pgd(__pa(tmp_p4d_table) | _KERNPG_TABLE)); 30912a8cc7fSAndrey Ryabinin } 31012a8cc7fSAndrey Ryabinin 31165ade2f8SKirill A. Shutemov load_cr3(early_top_pgt); 312241d2c54SAndrey Ryabinin __flush_tlb_all(); 313ef7f0d6aSAndrey Ryabinin 31412a8cc7fSAndrey Ryabinin clear_pgds(KASAN_SHADOW_START & PGDIR_MASK, KASAN_SHADOW_END); 315ef7f0d6aSAndrey Ryabinin 31612a8cc7fSAndrey Ryabinin kasan_populate_zero_shadow((void *)(KASAN_SHADOW_START & PGDIR_MASK), 317ef7f0d6aSAndrey Ryabinin kasan_mem_to_shadow((void *)PAGE_OFFSET)); 318ef7f0d6aSAndrey Ryabinin 31908b46d5dSIngo Molnar for (i = 0; i < E820_MAX_ENTRIES; i++) { 320ef7f0d6aSAndrey Ryabinin if (pfn_mapped[i].end == 0) 321ef7f0d6aSAndrey Ryabinin break; 322ef7f0d6aSAndrey Ryabinin 3232aeb0736SAndrey Ryabinin map_range(&pfn_mapped[i]); 324ef7f0d6aSAndrey Ryabinin } 3252aeb0736SAndrey Ryabinin 32692a0f81dSThomas Gleixner shadow_cpu_entry_begin = (void *)CPU_ENTRY_AREA_BASE; 32792a0f81dSThomas Gleixner shadow_cpu_entry_begin = kasan_mem_to_shadow(shadow_cpu_entry_begin); 32892a0f81dSThomas Gleixner shadow_cpu_entry_begin = (void *)round_down((unsigned long)shadow_cpu_entry_begin, 32992a0f81dSThomas Gleixner PAGE_SIZE); 33092a0f81dSThomas Gleixner 33192a0f81dSThomas Gleixner shadow_cpu_entry_end = (void *)(CPU_ENTRY_AREA_BASE + 33292a0f81dSThomas Gleixner CPU_ENTRY_AREA_MAP_SIZE); 33392a0f81dSThomas Gleixner shadow_cpu_entry_end = kasan_mem_to_shadow(shadow_cpu_entry_end); 33492a0f81dSThomas Gleixner shadow_cpu_entry_end = (void *)round_up((unsigned long)shadow_cpu_entry_end, 33592a0f81dSThomas Gleixner PAGE_SIZE); 33692a0f81dSThomas Gleixner 33769786cdbSAndrey Ryabinin kasan_populate_zero_shadow( 33869786cdbSAndrey Ryabinin kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM), 33992a0f81dSThomas Gleixner shadow_cpu_entry_begin); 34092a0f81dSThomas Gleixner 34192a0f81dSThomas Gleixner kasan_populate_shadow((unsigned long)shadow_cpu_entry_begin, 34292a0f81dSThomas Gleixner (unsigned long)shadow_cpu_entry_end, 0); 34392a0f81dSThomas Gleixner 34492a0f81dSThomas Gleixner kasan_populate_zero_shadow(shadow_cpu_entry_end, 345c420f167SAndrey Ryabinin kasan_mem_to_shadow((void *)__START_KERNEL_map)); 346c420f167SAndrey Ryabinin 3472aeb0736SAndrey Ryabinin kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext), 348c420f167SAndrey Ryabinin (unsigned long)kasan_mem_to_shadow(_end), 3492aeb0736SAndrey Ryabinin early_pfn_to_nid(__pa(_stext))); 350c420f167SAndrey Ryabinin 35169786cdbSAndrey Ryabinin kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END), 35292a0f81dSThomas Gleixner (void *)KASAN_SHADOW_END); 353ef7f0d6aSAndrey Ryabinin 35465ade2f8SKirill A. Shutemov load_cr3(init_top_pgt); 355241d2c54SAndrey Ryabinin __flush_tlb_all(); 35685155229SAndrey Ryabinin 35769e0210fSAndrey Ryabinin /* 35869e0210fSAndrey Ryabinin * kasan_zero_page has been used as early shadow memory, thus it may 359063fb3e5SAndrey Ryabinin * contain some garbage. Now we can clear and write protect it, since 360063fb3e5SAndrey Ryabinin * after the TLB flush no one should write to it. 36169e0210fSAndrey Ryabinin */ 36269e0210fSAndrey Ryabinin memset(kasan_zero_page, 0, PAGE_SIZE); 363063fb3e5SAndrey Ryabinin for (i = 0; i < PTRS_PER_PTE; i++) { 36421729f81STom Lendacky pte_t pte = __pte(__pa(kasan_zero_page) | __PAGE_KERNEL_RO | _PAGE_ENC); 365063fb3e5SAndrey Ryabinin set_pte(&kasan_zero_pte[i], pte); 366063fb3e5SAndrey Ryabinin } 367063fb3e5SAndrey Ryabinin /* Flush TLBs again to be sure that write protection applied. */ 368063fb3e5SAndrey Ryabinin __flush_tlb_all(); 36969e0210fSAndrey Ryabinin 37069e0210fSAndrey Ryabinin init_task.kasan_depth = 0; 37125add7ecSAndrey Konovalov pr_info("KernelAddressSanitizer initialized\n"); 372ef7f0d6aSAndrey Ryabinin } 373