1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_KASAN_H 3 #define __ASM_KASAN_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <linux/linkage.h> 8 #include <linux/mmzone.h> 9 #include <asm/addrspace.h> 10 #include <asm/io.h> 11 #include <asm/pgtable.h> 12 13 #define KASAN_SHADOW_SCALE_SHIFT 3 14 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) 15 16 #define XRANGE_SHIFT (48) 17 18 /* Valid address length */ 19 #define XRANGE_SHADOW_SHIFT min(cpu_vabits, VA_BITS) 20 /* Used for taking out the valid address */ 21 #define XRANGE_SHADOW_MASK GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0) 22 /* One segment whole address space size */ 23 #define XRANGE_SIZE (XRANGE_SHADOW_MASK + 1) 24 25 /* 64-bit segment value. */ 26 #define XKPRANGE_UC_SEG (0x8000) 27 #define XKPRANGE_CC_SEG (0x9000) 28 #define XKVRANGE_VC_SEG (0xffff) 29 30 /* Cached */ 31 #define XKPRANGE_CC_START CACHE_BASE 32 #define XKPRANGE_CC_SIZE XRANGE_SIZE 33 #define XKPRANGE_CC_KASAN_OFFSET (0) 34 #define XKPRANGE_CC_SHADOW_SIZE (XKPRANGE_CC_SIZE >> KASAN_SHADOW_SCALE_SHIFT) 35 #define XKPRANGE_CC_SHADOW_END (XKPRANGE_CC_KASAN_OFFSET + XKPRANGE_CC_SHADOW_SIZE) 36 37 /* UnCached */ 38 #define XKPRANGE_UC_START UNCACHE_BASE 39 #define XKPRANGE_UC_SIZE XRANGE_SIZE 40 #define XKPRANGE_UC_KASAN_OFFSET XKPRANGE_CC_SHADOW_END 41 #define XKPRANGE_UC_SHADOW_SIZE (XKPRANGE_UC_SIZE >> KASAN_SHADOW_SCALE_SHIFT) 42 #define XKPRANGE_UC_SHADOW_END (XKPRANGE_UC_KASAN_OFFSET + XKPRANGE_UC_SHADOW_SIZE) 43 44 /* VMALLOC (Cached or UnCached) */ 45 #define XKVRANGE_VC_START MODULES_VADDR 46 #define XKVRANGE_VC_SIZE round_up(KFENCE_AREA_END - MODULES_VADDR + 1, PGDIR_SIZE) 47 #define XKVRANGE_VC_KASAN_OFFSET XKPRANGE_UC_SHADOW_END 48 #define XKVRANGE_VC_SHADOW_SIZE (XKVRANGE_VC_SIZE >> KASAN_SHADOW_SCALE_SHIFT) 49 #define XKVRANGE_VC_SHADOW_END (XKVRANGE_VC_KASAN_OFFSET + XKVRANGE_VC_SHADOW_SIZE) 50 51 /* KAsan shadow memory start right after vmalloc. */ 52 #define KASAN_SHADOW_START round_up(KFENCE_AREA_END, PGDIR_SIZE) 53 #define KASAN_SHADOW_SIZE (XKVRANGE_VC_SHADOW_END - XKPRANGE_CC_KASAN_OFFSET) 54 #define KASAN_SHADOW_END round_up(KASAN_SHADOW_START + KASAN_SHADOW_SIZE, PGDIR_SIZE) 55 56 #define XKPRANGE_CC_SHADOW_OFFSET (KASAN_SHADOW_START + XKPRANGE_CC_KASAN_OFFSET) 57 #define XKPRANGE_UC_SHADOW_OFFSET (KASAN_SHADOW_START + XKPRANGE_UC_KASAN_OFFSET) 58 #define XKVRANGE_VC_SHADOW_OFFSET (KASAN_SHADOW_START + XKVRANGE_VC_KASAN_OFFSET) 59 60 extern bool kasan_early_stage; 61 extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; 62 63 #define kasan_mem_to_shadow kasan_mem_to_shadow 64 void *kasan_mem_to_shadow(const void *addr); 65 66 #define kasan_shadow_to_mem kasan_shadow_to_mem 67 const void *kasan_shadow_to_mem(const void *shadow_addr); 68 69 #define kasan_arch_is_ready kasan_arch_is_ready 70 static __always_inline bool kasan_arch_is_ready(void) 71 { 72 return !kasan_early_stage; 73 } 74 75 #define addr_has_metadata addr_has_metadata 76 static __always_inline bool addr_has_metadata(const void *addr) 77 { 78 return (kasan_mem_to_shadow((void *)addr) != NULL); 79 } 80 81 void kasan_init(void); 82 asmlinkage void kasan_early_init(void); 83 84 #endif 85 #endif 86