/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __MM_KASAN_KASAN_H #define __MM_KASAN_KASAN_H #include #include #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) #define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) #else #include #define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE #endif #define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1) #define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT) #define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */ #define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */ #define KASAN_TAG_MAX 0xFD /* maximum value for random tags */ #ifdef CONFIG_KASAN_GENERIC #define KASAN_FREE_PAGE 0xFF /* page was freed */ #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ #define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */ #define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */ #define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */ #else #define KASAN_FREE_PAGE KASAN_TAG_INVALID #define KASAN_PAGE_REDZONE KASAN_TAG_INVALID #define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID #define KASAN_KMALLOC_FREE KASAN_TAG_INVALID #define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID #endif #define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */ #define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */ /* * Stack redzone shadow values * (Those are compiler's ABI, don't change them) */ #define KASAN_STACK_LEFT 0xF1 #define KASAN_STACK_MID 0xF2 #define KASAN_STACK_RIGHT 0xF3 #define KASAN_STACK_PARTIAL 0xF4 /* * alloca redzone shadow values */ #define KASAN_ALLOCA_LEFT 0xCA #define KASAN_ALLOCA_RIGHT 0xCB #define KASAN_ALLOCA_REDZONE_SIZE 32 /* * Stack frame marker (compiler ABI). */ #define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3 /* Don't break randconfig/all*config builds */ #ifndef KASAN_ABI_VERSION #define KASAN_ABI_VERSION 1 #endif /* Metadata layout customization. */ #define META_BYTES_PER_BLOCK 1 #define META_BLOCKS_PER_ROW 16 #define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK) #define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE) #define META_ROWS_AROUND_ADDR 2 struct kasan_access_info { const void *access_addr; const void *first_bad_addr; size_t access_size; bool is_write; unsigned long ip; }; /* The layout of struct dictated by compiler */ struct kasan_source_location { const char *filename; int line_no; int column_no; }; /* The layout of struct dictated by compiler */ struct kasan_global { const void *beg; /* Address of the beginning of the global variable. */ size_t size; /* Size of the global variable. */ size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */ const void *name; const void *module_name; /* Name of the module where the global variable is declared. */ unsigned long has_dynamic_init; /* This needed for C++ */ #if KASAN_ABI_VERSION >= 4 struct kasan_source_location *location; #endif #if KASAN_ABI_VERSION >= 5 char *odr_indicator; #endif }; /** * Structures to keep alloc and free tracks * */ #define KASAN_STACK_DEPTH 64 struct kasan_track { u32 pid; depot_stack_handle_t stack; }; #ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY #define KASAN_NR_FREE_STACKS 5 #else #define KASAN_NR_FREE_STACKS 1 #endif struct kasan_alloc_meta { struct kasan_track alloc_track; #ifdef CONFIG_KASAN_GENERIC /* * call_rcu() call stack is stored into struct kasan_alloc_meta. * The free stack is stored into struct kasan_free_meta. */ depot_stack_handle_t aux_stack[2]; #else struct kasan_track free_track[KASAN_NR_FREE_STACKS]; #endif #ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY u8 free_pointer_tag[KASAN_NR_FREE_STACKS]; u8 free_track_idx; #endif }; struct qlist_node { struct qlist_node *next; }; struct kasan_free_meta { /* This field is used while the object is in the quarantine. * Otherwise it might be used for the allocator freelist. */ struct qlist_node quarantine_link; #ifdef CONFIG_KASAN_GENERIC struct kasan_track free_track; #endif }; struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache, const void *object); struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, const void *object); void poison_range(const void *address, size_t size, u8 value); void unpoison_range(const void *address, size_t size); #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) static inline const void *kasan_shadow_to_mem(const void *shadow_addr) { return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT); } static inline bool addr_has_metadata(const void *addr) { return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START)); } /** * check_memory_region - Check memory region, and report if invalid access. * @addr: the accessed address * @size: the accessed size * @write: true if access is a write access * @ret_ip: return address * @return: true if access was valid, false if invalid */ bool check_memory_region(unsigned long addr, size_t size, bool write, unsigned long ret_ip); #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ static inline bool addr_has_metadata(const void *addr) { return true; } #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ bool check_invalid_free(void *addr); void *find_first_bad_addr(void *addr, size_t size); const char *get_bug_type(struct kasan_access_info *info); void metadata_fetch_row(char *buffer, void *row); #if defined(CONFIG_KASAN_GENERIC) && CONFIG_KASAN_STACK void print_address_stack_frame(const void *addr); #else static inline void print_address_stack_frame(const void *addr) { } #endif bool kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip); void kasan_report_invalid_free(void *object, unsigned long ip); struct page *kasan_addr_to_page(const void *addr); depot_stack_handle_t kasan_save_stack(gfp_t flags); void kasan_set_track(struct kasan_track *track, gfp_t flags); void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag); struct kasan_track *kasan_get_free_track(struct kmem_cache *cache, void *object, u8 tag); #if defined(CONFIG_KASAN_GENERIC) && \ (defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) void quarantine_put(struct kmem_cache *cache, void *object); void quarantine_reduce(void); void quarantine_remove_cache(struct kmem_cache *cache); #else static inline void quarantine_put(struct kmem_cache *cache, void *object) { } static inline void quarantine_reduce(void) { } static inline void quarantine_remove_cache(struct kmem_cache *cache) { } #endif #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) void print_tags(u8 addr_tag, const void *addr); u8 random_tag(void); #else static inline void print_tags(u8 addr_tag, const void *addr) { } static inline u8 random_tag(void) { return 0; } #endif #ifndef arch_kasan_set_tag static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) { return addr; } #endif #ifndef arch_kasan_reset_tag #define arch_kasan_reset_tag(addr) ((void *)(addr)) #endif #ifndef arch_kasan_get_tag #define arch_kasan_get_tag(addr) 0 #endif #define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag))) #define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr)) #define get_tag(addr) arch_kasan_get_tag(addr) #ifdef CONFIG_KASAN_HW_TAGS #ifndef arch_enable_tagging #define arch_enable_tagging() #endif #ifndef arch_init_tags #define arch_init_tags(max_tag) #endif #ifndef arch_get_random_tag #define arch_get_random_tag() (0xFF) #endif #ifndef arch_get_mem_tag #define arch_get_mem_tag(addr) (0xFF) #endif #ifndef arch_set_mem_tag_range #define arch_set_mem_tag_range(addr, size, tag) ((void *)(addr)) #endif #define hw_enable_tagging() arch_enable_tagging() #define hw_init_tags(max_tag) arch_init_tags(max_tag) #define hw_get_random_tag() arch_get_random_tag() #define hw_get_mem_tag(addr) arch_get_mem_tag(addr) #define hw_set_mem_tag_range(addr, size, tag) arch_set_mem_tag_range((addr), (size), (tag)) #endif /* CONFIG_KASAN_HW_TAGS */ /* * Exported functions for interfaces called from assembly or from generated * code. Declarations here to avoid warning about missing declarations. */ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark); void __asan_register_globals(struct kasan_global *globals, size_t size); void __asan_unregister_globals(struct kasan_global *globals, size_t size); void __asan_handle_no_return(void); void __asan_alloca_poison(unsigned long addr, size_t size); void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom); void __asan_load1(unsigned long addr); void __asan_store1(unsigned long addr); void __asan_load2(unsigned long addr); void __asan_store2(unsigned long addr); void __asan_load4(unsigned long addr); void __asan_store4(unsigned long addr); void __asan_load8(unsigned long addr); void __asan_store8(unsigned long addr); void __asan_load16(unsigned long addr); void __asan_store16(unsigned long addr); void __asan_loadN(unsigned long addr, size_t size); void __asan_storeN(unsigned long addr, size_t size); void __asan_load1_noabort(unsigned long addr); void __asan_store1_noabort(unsigned long addr); void __asan_load2_noabort(unsigned long addr); void __asan_store2_noabort(unsigned long addr); void __asan_load4_noabort(unsigned long addr); void __asan_store4_noabort(unsigned long addr); void __asan_load8_noabort(unsigned long addr); void __asan_store8_noabort(unsigned long addr); void __asan_load16_noabort(unsigned long addr); void __asan_store16_noabort(unsigned long addr); void __asan_loadN_noabort(unsigned long addr, size_t size); void __asan_storeN_noabort(unsigned long addr, size_t size); void __asan_report_load1_noabort(unsigned long addr); void __asan_report_store1_noabort(unsigned long addr); void __asan_report_load2_noabort(unsigned long addr); void __asan_report_store2_noabort(unsigned long addr); void __asan_report_load4_noabort(unsigned long addr); void __asan_report_store4_noabort(unsigned long addr); void __asan_report_load8_noabort(unsigned long addr); void __asan_report_store8_noabort(unsigned long addr); void __asan_report_load16_noabort(unsigned long addr); void __asan_report_store16_noabort(unsigned long addr); void __asan_report_load_n_noabort(unsigned long addr, size_t size); void __asan_report_store_n_noabort(unsigned long addr, size_t size); void __asan_set_shadow_00(const void *addr, size_t size); void __asan_set_shadow_f1(const void *addr, size_t size); void __asan_set_shadow_f2(const void *addr, size_t size); void __asan_set_shadow_f3(const void *addr, size_t size); void __asan_set_shadow_f5(const void *addr, size_t size); void __asan_set_shadow_f8(const void *addr, size_t size); void __hwasan_load1_noabort(unsigned long addr); void __hwasan_store1_noabort(unsigned long addr); void __hwasan_load2_noabort(unsigned long addr); void __hwasan_store2_noabort(unsigned long addr); void __hwasan_load4_noabort(unsigned long addr); void __hwasan_store4_noabort(unsigned long addr); void __hwasan_load8_noabort(unsigned long addr); void __hwasan_store8_noabort(unsigned long addr); void __hwasan_load16_noabort(unsigned long addr); void __hwasan_store16_noabort(unsigned long addr); void __hwasan_loadN_noabort(unsigned long addr, size_t size); void __hwasan_storeN_noabort(unsigned long addr, size_t size); void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size); #endif