1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/types.h>
14 #include <asm/kasan.h>
15 #include <asm/pgtable.h>
17 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
18 extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
19 extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
20 extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
21 extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
23 int kasan_populate_early_shadow(const void *shadow_start,
24 const void *shadow_end);
26 static inline void *kasan_mem_to_shadow(const void *addr)
28 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
29 + KASAN_SHADOW_OFFSET;
32 /* Enable reporting bugs after kasan_disable_current() */
33 extern void kasan_enable_current(void);
35 /* Disable reporting bugs for current task */
36 extern void kasan_disable_current(void);
38 void kasan_unpoison_shadow(const void *address, size_t size);
40 void kasan_unpoison_task_stack(struct task_struct *task);
41 void kasan_unpoison_stack_above_sp_to(const void *watermark);
43 void kasan_alloc_pages(struct page *page, unsigned int order);
44 void kasan_free_pages(struct page *page, unsigned int order);
46 void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
49 void kasan_poison_slab(struct page *page);
50 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
51 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
52 void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
55 void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
57 void kasan_kfree_large(void *ptr, unsigned long ip);
58 void kasan_poison_kfree(void *ptr, unsigned long ip);
59 void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
60 size_t size, gfp_t flags);
61 void * __must_check kasan_krealloc(const void *object, size_t new_size,
64 void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
66 bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
69 int alloc_meta_offset;
73 int kasan_module_alloc(void *addr, size_t size);
74 void kasan_free_shadow(const struct vm_struct *vm);
76 int kasan_add_zero_shadow(void *start, unsigned long size);
77 void kasan_remove_zero_shadow(void *start, unsigned long size);
79 size_t ksize(const void *);
80 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
81 size_t kasan_metadata_size(struct kmem_cache *cache);
83 bool kasan_save_enable_multi_shot(void);
84 void kasan_restore_multi_shot(bool enabled);
86 #else /* CONFIG_KASAN */
88 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
90 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
91 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
93 static inline void kasan_enable_current(void) {}
94 static inline void kasan_disable_current(void) {}
96 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
97 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
99 static inline void kasan_cache_create(struct kmem_cache *cache,
101 slab_flags_t *flags) {}
103 static inline void kasan_poison_slab(struct page *page) {}
104 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
106 static inline void kasan_poison_object_data(struct kmem_cache *cache,
108 static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
111 return (void *)object;
114 static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
118 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
119 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
120 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
121 size_t size, gfp_t flags)
123 return (void *)object;
125 static inline void *kasan_krealloc(const void *object, size_t new_size,
128 return (void *)object;
131 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
136 static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
142 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
143 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
145 static inline int kasan_add_zero_shadow(void *start, unsigned long size)
149 static inline void kasan_remove_zero_shadow(void *start,
153 static inline void kasan_unpoison_slab(const void *ptr) { }
154 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
156 #endif /* CONFIG_KASAN */
158 #ifdef CONFIG_KASAN_GENERIC
160 #define KASAN_SHADOW_INIT 0
162 void kasan_cache_shrink(struct kmem_cache *cache);
163 void kasan_cache_shutdown(struct kmem_cache *cache);
165 #else /* CONFIG_KASAN_GENERIC */
167 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
168 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
170 #endif /* CONFIG_KASAN_GENERIC */
172 #ifdef CONFIG_KASAN_SW_TAGS
174 #define KASAN_SHADOW_INIT 0xFF
176 void kasan_init_tags(void);
178 void *kasan_reset_tag(const void *addr);
180 void kasan_report(unsigned long addr, size_t size,
181 bool is_write, unsigned long ip);
183 #else /* CONFIG_KASAN_SW_TAGS */
185 static inline void kasan_init_tags(void) { }
187 static inline void *kasan_reset_tag(const void *addr)
192 #endif /* CONFIG_KASAN_SW_TAGS */
194 #endif /* LINUX_KASAN_H */